CN109405353A - Method for controlling oil return and control system, storage medium and three control air-conditioning systems - Google Patents

Method for controlling oil return and control system, storage medium and three control air-conditioning systems Download PDF

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Publication number
CN109405353A
CN109405353A CN201811276640.XA CN201811276640A CN109405353A CN 109405353 A CN109405353 A CN 109405353A CN 201811276640 A CN201811276640 A CN 201811276640A CN 109405353 A CN109405353 A CN 109405353A
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China
Prior art keywords
compressor
oil return
preset duration
way valve
control
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Granted
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CN201811276640.XA
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Chinese (zh)
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CN109405353B (en
Inventor
王新利
熊美兵
冯明坤
赵浩伟
刘加劲
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Priority to CN201811276640.XA priority Critical patent/CN109405353B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/01—Timing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention proposes a kind of method for controlling oil return, oil return control system, computer readable storage medium and three control air-conditioning systems.Wherein, method for controlling oil return, for controlling three control air-conditioning systems, comprising: when air-conditioning system enters oil return mode up to the first preset duration, control the first solenoid valve and second solenoid valve open, the second four-way valve power down, to form the circulation of refrigerant and refrigeration oil；After second preset duration, the second four-way valve of control is powered on；The pressure at expulsion of compressor and the difference of back pressure are detected, judges whether difference is less than or equal to preset pressure；When difference is less than or equal to preset pressure, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；And when difference is greater than the first preset pressure, exit oil return mode.The present invention rationally controls the movement of solenoid valve and four-way valve, realizes the circulation of refrigerant and refrigeration oil in three control air-conditioning system intermediate ducts, avoids the accumulation of refrigeration oil in intermediate duct.

Description

Method for controlling oil return and control system, storage medium and three control air-conditioning systems
Technical field
The present invention relates to air-conditioning technical fields, in particular to a kind of method for controlling oil return, oil return control system, meter Calculation machine readable storage medium storing program for executing and three control air-conditioning systems.
Background technique
Full frequency conversion three-pipe heating recycling central air-conditioning can refrigeration and heating simultaneously, create miracle for Heating,Ventilating and Air Conditioning industry. When unit cooling and warming simultaneously, the heat recovery of refrigerated area is discharged into the region of heating by unit, is reduced to outdoor discharge Cooling capacity or heat, and unit at this time only used it is corresponding refrigeration or heating power consumption.Refrigerating capacity and the ratio of heating capacity are also It can be the people of indoor different demands with any adjusting of the variation of ambient air temperature, regardless of outdoor environment temperature changes Group provides comfortable environment.
And the refrigeration lubrication oil in air-conditioning system, it is to guarantee compressor reliability operation key factor.How machine is being guaranteed Under the premise of group operates normally, the oil return control under the distinctive pipe-line system frame mode of three control is realized.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, first aspect of the present invention is to propose a kind of method for controlling oil return.
The second aspect of the invention is to propose a kind of oil return control system.
The third aspect of the invention is to propose a kind of computer readable storage medium.
The fourth aspect of the invention is to propose a kind of three control air-conditioning systems.
In view of this, being used for three control air-conditioning systems according to an aspect of the present invention, it proposes a kind of method for controlling oil return System, air-conditioning system includes: outdoor machine system and indoor set system, and outdoor machine system includes compressor, at least one outdoor heat exchange Device, the first four-way valve corresponding with heat exchanger, gas-liquid separator, the second four-way valve；Indoor set system includes at least one room Interior machine, the first solenoid valve corresponding with indoor unit and second solenoid valve；Wherein, the output end of compressor by the first four-way valve with The input terminal of outdoor heat exchanger is connected；The output end of compressor passes through the second four-way valve, indoor set system and outdoor machine system Intermediate duct be connected with the input terminal of second solenoid valve；The input terminal of the output end of second solenoid valve and the first solenoid valve, The output end of indoor unit is connected；The output end of first solenoid valve is connected with the input terminal of gas-liquid separator；Gas-liquid separator The input terminal of compressor of output end be connected；Method for controlling oil return includes: when air-conditioning system enters oil return mode up to first When preset duration, control the first solenoid valve and second solenoid valve open, the second four-way valve power down, to open refrigerant and refrigeration oil Circulation；After second preset duration, control the second four-way valve power on, control compressor running frequency restore to enter oil return mode Preceding running frequency；The pressure at expulsion of compressor and the difference of back pressure are detected, it is default to judge whether difference is less than or equal to Pressure；When difference is less than or equal to preset pressure, control compressor promotes running frequency to the first assigned frequency and runs the Three preset durations；And when difference is greater than the first preset pressure, exit oil return mode.
Method for controlling oil return provided by the invention, when air-conditioning system enters oil return the first preset duration of mode, control the One solenoid valve and second solenoid valve unlatching, the second four-way valve power down, at this point, the refrigerant of the high-temperature high-pressure state come out from compressor Enter the intermediate duct between outdoor machine system and indoor set system by the second four-way valve, then passes through second solenoid valve respectively With the first solenoid valve, it is being recycled to gas-liquid separator, the circulation of refrigerant and refrigeration oil is being formed, after the second preset duration, it is contemplated that The circulation for completing refrigerant and refrigeration oil, then control the second four-way valve and power on, by the pressure at expulsion and return-air pressure that detect compressor The difference of power, and compared with preset pressure value judges whether four-way valve commutates success, if difference is not more than preset pressure value, Then the commutation of the second four-way valve of specification is failed, then the running frequency by promoting compressor is formed to the first formulation frequency Pipeline height pressure difference, and then realize the commutation of the second four-way valve；It is greater than in the difference of Compressor Discharge Pressure and back pressure pre- If when pressure value, illustrating that the second four-way valve commutates successfully, then control system exits oil return mode so that four-way valve, solenoid valve, Compressor etc. is restored to the state before oil return, complete oil return mode and normal mode (such as refrigeration mode, heating mode) at Function switching.In this way, the rationally movement of control solenoid valve and four-way valve, realizes refrigerant and cold in three control air-conditioning system intermediate ducts The circulation of frozen oil, avoids the accumulation of refrigeration oil in intermediate duct, and leads to the reduction of system circulation refrigeration oil, improves compression Machine lubricating reliability and whole system reliability of operation.
Above-mentioned method for controlling oil return according to the present invention, can also have following technical characteristic:
In the above-mentioned technical solutions, it is preferable that further include: when air-conditioning system enters oil return mode, control compressor with The operation of second assigned frequency；After 4th preset duration, compressor is controlled with third assigned frequency and runs the 5th preset duration；Its In, third assigned frequency is greater than the second assigned frequency；5th preset duration is equal to the first preset duration and the 4th preset duration Difference.
In the technical scheme, when air-conditioning system has just entered oil return mode, first control will be at random with the second specified frequency Rate runs the 4th preset duration, and the running frequency of compressor in the normal mode is switched to the second assigned frequency, so that compression Machine is first transitioned into the second assigned frequency, then carries out improving running frequency value third assigned frequency, avoids directly running compressor Frequency error factor is higher third assigned frequency, improves the reliability of air-conditioning system.Wherein, it is pre- to be equal to first for the 5th preset duration If the difference of duration and the 4th preset duration, that is to say, that after control compressor runs certain time with the second assigned frequency, Carry out again control the first solenoid valve and second solenoid valve open, the second four-way valve power down, guarantee compressor high-frequency operation and The flow velocity of refrigerant is improved, so that the refrigeration oil taken out of by refrigerant takes back compressor, completes the circulation of refrigeration oil.
In any of the above-described technical solution, it is preferable that control compressor promoted running frequency to the first assigned frequency simultaneously After operation third preset duration, further includes: repeat the pressure at expulsion of detection compressor and the difference of back pressure, judge difference The step of whether being less than or equal to preset pressure；And it to the first assigned frequency and is run when control compressor promotes running frequency When the number of third preset duration reaches predetermined number of times, difference still less than or be equal to preset pressure, then control compressor shutdown, and Issue the fault cues of the second four-way valve.
In the technical scheme, it is less than preset pressure value in the pressure at expulsion of compressor and the difference of back pressure, and controls Compressor processed promotes running frequency to the first assigned frequency and after running third preset duration, and difference and default pressure are compared in repetition Force value is not more than preset pressure value in difference, controls compressor again and promotes running frequency to the first assigned frequency and run the Three preset durations, to realize the commutation of the second four-way valve；When multiple (predetermined number of times) promoted running frequency to first specified Frequency and after running third preset duration, difference then determines that four-way valve can not commutate, then in time still less than preset pressure Control compressor shutdown, and issue the fault cues of the second four-way valve, air-conditioning system unit resets again, into be switched on again to Machine state avoids the failure of the second four-way valve from leading to the influence to the reliability and stability of air-conditioning system.
In any of the above-described technical solution, it is preferable that the first preset duration range is 220 seconds to 260 seconds；Second it is default when Long range is 40 seconds to 80 seconds；Third preset duration range is 40 seconds to 80 seconds；4th preset duration range is 100 seconds to 140 Second.
In the technical scheme, through reasonable settings the first preset duration, the second preset duration, third preset duration and The range of 4th preset duration is realized and rationally adjusts oil return time and oil return control logic, realizes that air-conditioning system is efficiently stablized Operation.
In any of the above-described technical solution, it is preferable that further include: before controlling the second four-way valve and powering on, control second Solenoid valve closes the 6th preset duration；While the second four-way valve of control powers on, control second solenoid valve is opened.
In the technical scheme, it before controlling the second four-way valve and powering on, can also be closed by control second solenoid valve 6th preset duration forms refrigerant and freezes the height pressure difference of oil circuit piping, realize refrigeration oil circulation, controlling the second four-way While valve powers on, control second solenoid valve is opened, and realizes the normal commutation of the second four-way valve.
In any of the above-described technical solution, it is preferable that before air-conditioning system enters oil return mode, further includes: work as reception When to refrigeration mode operating instruction, the first four-way valve power down of control, second solenoid valve are opened, the second four-way valve powers on, to be formed Refrigeration cycle.
In the technical scheme, when air-conditioning carries out refrigeration mode, the first four-way valve power down of control, second solenoid valve are opened Open, the second four-way valve powers on, the high temperature and pressure refrigerant of compressor discharge reaches outdoor heat exchanger by the first four-way valve, carries out cold After solidifying heat release, it is evaporated heat exchange by the electric expansion valve, the machine of entering the room that connect with outdoor heat exchanger output end, is then passed through Second solenoid valve is crossed, into gas-liquid separator, is eventually returned to compressor, completes the refrigeration cycle of air-conditioning system.
According to the second aspect of the invention, a kind of oil return control system is proposed, three control air-conditioning systems, air-conditioning are used for System includes: outdoor machine system and indoor set system, outdoor machine system include compressor, at least one outdoor heat exchanger, with change Corresponding first four-way valve of hot device, gas-liquid separator, the second four-way valve；Indoor set system include at least one indoor unit, with Corresponding first solenoid valve of indoor unit and second solenoid valve；Wherein, the output end of compressor is changed by the first four-way valve with outdoor The input terminal of hot device is connected；The centre that the output end of compressor passes through the second four-way valve, indoor set system and outdoor machine system Pipeline is connected with the input terminal of second solenoid valve；The input terminal of the output end of second solenoid valve and the first solenoid valve, indoor unit Output end be connected；The output end of first solenoid valve is connected with the input terminal of gas-liquid separator；The output of gas-liquid separator The input terminal of the compressor at end is connected；Oil return control system includes: memory, for storing computer program；Processor is used In execute computer program with: when air-conditioning system enters oil return mode up to the first preset duration, control the first solenoid valve and the The unlatching of two solenoid valves, the second four-way valve power down, to form the circulation of refrigerant and refrigeration oil；After second preset duration, control second Four-way valve powers on, control compressor running frequency restore to enter oil return mode before running frequency；Detect the row of compressor The difference of atmospheric pressure and back pressure, judges whether difference is less than or equal to preset pressure；When difference is less than or equal to default pressure When power, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；And when difference is greater than the When one preset pressure, oil return mode is exited.
Oil return control system provided by the invention, memory store computer program；When processor executes computer program, When air-conditioning system enters oil return the first preset duration of mode, the first solenoid valve and second solenoid valve unlatching, the second four-way are controlled Valve power down, at this point, the refrigerant of the high-temperature high-pressure state come out from compressor enters outdoor machine system and room by the second four-way valve Then intermediate duct between interior machine system is being recycled to gas-liquid separator by second solenoid valve and the first solenoid valve respectively, The circulation for forming refrigerant and refrigeration oil, after the second preset duration, it is contemplated that the circulation for completing refrigerant and refrigeration oil then controls second Four-way valve powers on, by the pressure at expulsion of detection compressor and the difference of back pressure, and compared with preset pressure value, judgement Whether four-way valve commutates success, if difference is not more than preset pressure value, the commutation of the second four-way valve of specification is failed, then logical The running frequency for promoting compressor is crossed to the first formulation frequency, forms pipeline height pressure difference, and then realize changing for the second four-way valve To；When the difference of Compressor Discharge Pressure and back pressure is greater than preset pressure value, illustrate that the second four-way valve commutates successfully, that Control system exits oil return mode, so that four-way valve, solenoid valve, compressor etc. are restored to the state before oil return, completes back The successful switch of oily mode and normal mode (such as refrigeration mode, heating mode).In this way, rationally control solenoid valve and four-way valve Movement realizes the circulation of refrigerant and refrigeration oil in three control air-conditioning system intermediate ducts, avoids refrigeration oil in intermediate duct Accumulation, and lead to the reduction of system circulation refrigeration oil, improve compressor lubrication reliability and whole system reliability of operation.
Above-mentioned oil return control system according to the present invention, can also have following technical characteristic:
In the above-mentioned technical solutions, it is preferable that processor be also used to execute computer program with: when air-conditioning system enters back When oily mode, control compressor is run with the second assigned frequency；After 4th preset duration, compressor is controlled with third assigned frequency Run the 5th preset duration；Wherein, third assigned frequency is greater than the second assigned frequency；When 5th preset duration is default equal to first The long difference with the 4th preset duration.
In the technical scheme, when air-conditioning system has just entered oil return mode, first control will be at random with the second specified frequency Rate runs the 4th preset duration, and the running frequency of compressor in the normal mode is switched to the second assigned frequency, so that compression Machine is first transitioned into the second assigned frequency, then carries out improving running frequency value third assigned frequency, avoids directly running compressor Frequency error factor is higher third assigned frequency, improves the reliability of air-conditioning system.Wherein, it is pre- to be equal to first for the 5th preset duration If the difference of duration and the 4th preset duration, that is to say, that after control compressor runs certain time with the second assigned frequency, Carry out again control the first solenoid valve and second solenoid valve open, the second four-way valve power down, guarantee compressor high-frequency operation and The flow velocity of refrigerant is improved, so that the refrigeration oil taken out of by refrigerant takes back compressor, completes the circulation of refrigeration oil.
In any of the above-described technical solution, it is preferable that processor be also used to execute computer program with: control compressor Running frequency is promoted to the first assigned frequency and after running third preset duration, repeat the pressure at expulsion for detecting compressor and is returned The difference of atmospheric pressure judges the step of whether difference is less than or equal to preset pressure；And when control compressor promotes operation frequency Rate is to the first assigned frequency and when running the number of third preset duration and reaching predetermined number of times, difference still less than or be equal to default pressure Power then controls compressor shutdown, and issues the fault cues of the second four-way valve.
In the technical scheme, it is less than preset pressure value in the pressure at expulsion of compressor and the difference of back pressure, and controls Compressor processed promotes running frequency to the first assigned frequency and after running third preset duration, and difference and default pressure are compared in repetition Force value is not more than preset pressure value in difference, controls compressor again and promotes running frequency to the first assigned frequency and run the Three preset durations, to realize the commutation of the second four-way valve；When multiple (predetermined number of times) promoted running frequency to first specified Frequency and after running third preset duration, difference then determines that four-way valve can not commutate, then in time still less than preset pressure Control compressor shutdown, and issue the fault cues of the second four-way valve, air-conditioning system unit resets again, into be switched on again to Machine state avoids the failure of the second four-way valve from leading to the influence to the reliability and stability of air-conditioning system.
In any of the above-described technical solution, it is preferable that the first preset duration range is 220 seconds to 260 seconds；Second it is default when Long range is 40 seconds to 80 seconds；Third preset duration range is 40 seconds to 80 seconds；4th preset duration range is 100 seconds to 140 Second.
In the technical scheme, through reasonable settings the first preset duration, the second preset duration, third preset duration and The range of 4th preset duration is realized and rationally adjusts oil return time and oil return control logic, realizes that air-conditioning system is efficiently stablized Operation.
In any of the above-described technical solution, it is preferable that processor be also used to execute computer program with: control the two or four Before port valve powers on, control second solenoid valve closes the 6th preset duration；While controlling the second four-way valve and powering on, control the Two solenoid valves are opened.
In the technical scheme, it before controlling the second four-way valve and powering on, can also be closed by control second solenoid valve 6th preset duration forms refrigerant and freezes the height pressure difference of oil circuit piping, realize refrigeration oil circulation, controlling the second four-way While valve powers on, control second solenoid valve is opened, and realizes the normal commutation of the second four-way valve.
In any of the above-described technical solution, it is preferable that processor be also used to execute computer program with: when receive refrigeration When mode operation instructs, the first four-way valve power down of control, second solenoid valve are opened, the second four-way valve powers on, and are followed with forming refrigeration Ring.
In the technical scheme, when air-conditioning carries out refrigeration mode, the first four-way valve power down of control, second solenoid valve are opened Open, the second four-way valve powers on, the high temperature and pressure refrigerant of compressor discharge reaches outdoor heat exchanger by the first four-way valve, carries out cold After solidifying heat release, it is evaporated heat exchange by the electric expansion valve, the machine of entering the room that connect with outdoor heat exchanger output end, is then passed through Second solenoid valve is crossed, into gas-liquid separator, is eventually returned to compressor, completes the refrigeration cycle of air-conditioning system.
According to the third aspect of the present invention, it the present invention provides a kind of computer readable storage medium, is stored thereon with Computer program, the step of method for controlling oil return in any of the above-described technical solution is realized when computer program is executed by processor.
A kind of computer readable storage medium provided by the invention is stored thereon with computer program, computer program quilt The step of processor realizes method for controlling oil return in any of the above-described technical solution when executing, therefore with the method for controlling oil return Whole technical effects, details are not described herein.
According to the fourth aspect of the present invention, the present invention provides a kind of three control air-conditioning systems, comprising: such as any of the above-described The computer readable storage medium in oil return control system or any of the above-described technical solution in technical solution.
A kind of three control air-conditioning system provided by the invention, comprising: as the oil return in any of the above-described technical solution controls system Computer readable storage medium in system or any of the above-described technical solution, therefore have the oil return control system or computer can Whole technical effects of storage medium are read, details are not described herein.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention Recognize.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures Obviously and it is readily appreciated that, in which:
Fig. 1 shows the flow diagram of the method for controlling oil return of one embodiment of the present of invention；
Fig. 2 shows the flow diagrams of the method for controlling oil return of another embodiment of the invention；
Fig. 3 shows the flow diagram of the method for controlling oil return of yet another embodiment of the present invention；
Fig. 4 shows the flow diagram of the method for controlling oil return of another embodiment of the invention；
Fig. 5 shows the flow diagram of the method for controlling oil return of another embodiment of the invention；
Fig. 6 shows the structural schematic diagram of the multi-line system of a specific embodiment of the invention；
Fig. 7 shows the flow diagram of the method for controlling oil return of a specific embodiment of the invention；
Fig. 8 shows the schematic block diagram of the oil return control system of one embodiment of the present of invention；
Fig. 9 shows the schematic block diagram of the multi-line system of one embodiment of the present of invention.
Wherein, the appended drawing reference in Fig. 6 and the corresponding relationship between component names are as follows:
1 outdoor machine system, 10 compressors, 11 first four-way valves, 12 second four-way valves, 13 third four-way valves, Room 14 first External heat exchanger, 15 second outdoor heat exchangers, 16 first electric expansion valves, 17 second electric expansion valves, 18 gas-liquid separators, 19 is single To valve, 2 indoor units, 22 first indoor units, 24 second indoor units, machine controller in Room 3,31 first check valves, 32 second is unidirectional Valve, 33 third check valves, 34 the 4th check valves, 35 first solenoid valves, 36 second solenoid valves, 37 third solenoid valves, 38 the 4th electricity Magnet valve.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not limited to following public affairs The limitation for the specific embodiment opened.
The embodiment of first aspect present invention proposes a kind of method for controlling oil return, is used for three control air-conditioning systems, air-conditioning system System includes: outdoor machine system and indoor set system, and outdoor machine system includes compressor, at least one outdoor heat exchanger and heat exchange Corresponding first four-way valve of device, gas-liquid separator, the second four-way valve；Indoor set system includes at least one indoor unit and room Corresponding first solenoid valve of interior machine and second solenoid valve；Wherein, the output end of compressor passes through the first four-way valve and outdoor heat exchange The input terminal of device is connected；The output end of compressor passes through the second four-way valve, the intermediate tube of indoor set system and outdoor machine system Road is connected with the input terminal of second solenoid valve；The input terminal of the output end of second solenoid valve and the first solenoid valve, indoor unit Output end is connected；The output end of first solenoid valve is connected with the input terminal of gas-liquid separator；The output end of gas-liquid separator The input terminal of compressor be connected.
Fig. 1 shows the flow diagram of the method for controlling oil return of one embodiment of the present of invention.As shown in Figure 1, the party Method includes:
Step 102, when air-conditioning system enters oil return mode up to the first preset duration, the first solenoid valve and the second electricity are controlled Magnet valve unlatching, the second four-way valve power down, to open the circulation of refrigerant and refrigeration oil；
Step 104, after the second preset duration, control the second four-way valve power on, control compressor running frequency restore to Running frequency into before oil return mode；
Step 106, the pressure at expulsion of compressor and the difference of back pressure are detected, it is pre- to judge whether difference is less than or equal to If pressure；
Step 108, when difference is less than or equal to preset pressure, control compressor promotes running frequency to the first specified frequency Rate simultaneously runs third preset duration, and when difference is greater than the first preset pressure, exits oil return mode.
Method for controlling oil return provided by the invention, when air-conditioning system enters oil return the first preset duration of mode, control the One solenoid valve and second solenoid valve unlatching, the second four-way valve power down, at this point, the refrigerant of the high-temperature high-pressure state come out from compressor Enter the intermediate duct between outdoor machine system and indoor set system by the second four-way valve, then passes through second solenoid valve respectively With the first solenoid valve, it is being recycled to gas-liquid separator, the circulation of refrigerant and refrigeration oil is being formed, after the second preset duration, it is contemplated that The circulation for completing refrigerant and refrigeration oil, then control the second four-way valve and power on, by the pressure at expulsion and return-air pressure that detect compressor The difference of power, and compared with preset pressure value judges whether four-way valve commutates success, if difference is not more than preset pressure value, Then the commutation of the second four-way valve of specification is failed, then the running frequency by promoting compressor is formed to the first formulation frequency Pipeline height pressure difference, and then realize the commutation of the second four-way valve；It is greater than in the difference of Compressor Discharge Pressure and back pressure pre- If when pressure value, illustrating that the second four-way valve commutates successfully, then control system exits oil return mode so that four-way valve, solenoid valve, Compressor etc. is restored to the state before oil return, complete oil return mode and normal mode (such as refrigeration mode, heating mode) at Function switching.In this way, the rationally movement of control solenoid valve and four-way valve, realizes refrigerant and cold in three control air-conditioning system intermediate ducts The circulation of frozen oil, avoids the accumulation of refrigeration oil in intermediate duct, and leads to the reduction of system circulation refrigeration oil, improves compression Machine lubricating reliability and whole system reliability of operation.
Fig. 2 shows the flow diagrams of the method for controlling oil return of another embodiment of the invention.Wherein, this method packet It includes:
Step 202, when air-conditioning system enters oil return mode, control compressor is run with the second assigned frequency；
Step 204, after the 4th preset duration, compressor is controlled with third assigned frequency and runs the 5th preset duration；
Step 206, when air-conditioning system enters oil return mode up to the first preset duration, the first solenoid valve and the second electricity are controlled Magnet valve unlatching, the second four-way valve power down, to open the circulation of refrigerant and refrigeration oil；
Step 208, after the second preset duration, control the second four-way valve power on, control compressor running frequency restore to Running frequency into before oil return mode；
Step 210, the pressure at expulsion of compressor and the difference of back pressure are detected, it is pre- to judge whether difference is less than or equal to If pressure is, 212 are entered step, it is no, enter step 214；
Step 212, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；
Step 214, oil return mode is exited.
Wherein, third assigned frequency is greater than the second assigned frequency；5th preset duration is equal to the first preset duration and the 4th The difference of preset duration.
In this embodiment, when air-conditioning system has just entered oil return mode, first control will be at random with the second assigned frequency The 4th preset duration is run, the running frequency of compressor in the normal mode is switched into the second assigned frequency, so that compressor It is first transitioned into the second assigned frequency, then carries out improving running frequency value third assigned frequency, avoids that compressor is directly run frequency Rate is switched to higher third assigned frequency, improves the reliability of air-conditioning system.Wherein, it is default to be equal to first for the 5th preset duration The difference of duration and the 4th preset duration, that is to say, that control compressor with the second assigned frequency run certain time and then The first solenoid valve of control and second solenoid valve unlatching, the second four-way valve power down are carried out, guarantees the high-frequency operation of compressor and makes The flow velocity of refrigerant improves, so that the refrigeration oil taken out of by refrigerant takes back compressor, completes the circulation of refrigeration oil.
Fig. 3 shows the flow diagram of the method for controlling oil return of yet another embodiment of the present invention.Wherein, this method packet It includes:
Step 302, when air-conditioning system enters oil return mode, control compressor is run with the second assigned frequency；
Step 304, after the 4th preset duration, compressor is controlled with third assigned frequency and runs the 5th preset duration；
Step 306, when air-conditioning system enters oil return mode up to the first preset duration, the first solenoid valve and the second electricity are controlled Magnet valve unlatching, the second four-way valve power down, to open the circulation of refrigerant and refrigeration oil；
Step 308, after the second preset duration, control the second four-way valve power on, control compressor running frequency restore to Running frequency into before oil return mode；
Step 310, the pressure at expulsion of compressor and the difference of back pressure are detected, it is pre- to judge whether difference is less than or equal to If pressure is, 312 are entered step, it is no, enter step 318；
Step 312, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；
Step 314, judge that controlling compressor promotes running frequency to the first assigned frequency and run third preset duration Whether number reaches predetermined number of times, is, then enters step 316, no, then return step 310；
Step 316, when difference still less than or be equal to preset pressure, then control compressor shutdown, and issue the second four-way valve Fault cues；
Step 318, oil return mode is exited.
Wherein, third assigned frequency is greater than the second assigned frequency；5th preset duration is equal to the first preset duration and the 4th The difference of preset duration.
In this embodiment, it is less than preset pressure value in the pressure at expulsion of compressor and the difference of back pressure, and controls Compressor promotes running frequency to the first assigned frequency and after running third preset duration, and difference and preset pressure are compared in repetition Value is not more than preset pressure value in difference, controls compressor promotion running frequency again and to the first assigned frequency and runs third Preset duration, to realize the commutation of the second four-way valve；When multiple (predetermined number of times) promoted running frequency to the first specified frequency Rate and after running third preset duration, difference then determines that four-way valve can not commutate still less than preset pressure, then and time control Compressor shutdown processed, and the fault cues of the second four-way valve are issued, air-conditioning system unit resets again, standby into being switched on again State avoids the failure of the second four-way valve from leading to the influence to the reliability and stability of air-conditioning system.
Fig. 4 shows the flow diagram of the method for controlling oil return of another embodiment of the invention.Wherein, this method packet It includes:
Step 402, when air-conditioning system enters oil return mode, control compressor is run with the second assigned frequency；
Step 404, after the 4th preset duration, compressor is controlled with third assigned frequency and runs the 5th preset duration；
Step 406, when air-conditioning system enters oil return mode up to the first preset duration, the first solenoid valve and the second electricity are controlled Magnet valve unlatching, the second four-way valve power down, to open the circulation of refrigerant and refrigeration oil；
Step 408, after the second preset duration, control second solenoid valve closes the 6th preset duration；
Step 410, the second four-way valve of control powers on, and control second solenoid valve is opened, and the running frequency for controlling compressor is extensive It is multiple extremely to enter the running frequency before oil return mode；
Step 412, the pressure at expulsion of compressor and the difference of back pressure are detected, it is pre- to judge whether difference is less than or equal to If pressure is, 414 are entered step, it is no, enter step 420；
Step 414, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；
Step 416, judge that controlling compressor promotes running frequency to the first assigned frequency and run third preset duration Whether number reaches predetermined number of times, is, then enters step 418, no, then return step 412；
Step 418, when difference still less than or be equal to preset pressure, then control compressor shutdown, and issue the second four-way valve Fault cues；
Step 420, oil return mode is exited.
Wherein, third assigned frequency is greater than the second assigned frequency；5th preset duration is equal to the first preset duration and the 4th The difference of preset duration.
In this embodiment, it is controlling before the second four-way valve powers on, the can also be closed by control second solenoid valve Six preset durations form refrigerant and freeze the height pressure difference of oil circuit piping, realize refrigeration oil circulation, controlling the second four-way valve While powering on, control second solenoid valve is opened, and realizes the normal commutation of the second four-way valve.Wherein, by controlling the second electromagnetism After the open and close of valve forms height pressure difference, the pressure at expulsion of compressor and the difference of back pressure and preset pressure can be carried out The step of value compares also can be omitted with ensuring that the second four-way valve commutates successfully, in general, control opening for second solenoid valve Height pressure difference can be successfully formed by opening closing, i.e., after step 410, omit step 412, step 414 and step 416, directly Enter step 418.In this way, avoiding unnecessary control logic on the basis of guaranteeing the commutation of the second four-way valve successfully, reducing The operating load of air-conditioning system.
Fig. 5 shows the flow diagram of the method for controlling oil return of another embodiment of the invention.Wherein, this method packet It includes:
Step 502, when receiving refrigeration mode operating instruction, control the first four-way valve power down, second solenoid valve open, Second four-way valve powers on, to form refrigeration cycle；
Step 504, when air-conditioning system enters oil return mode, control compressor is run with the second assigned frequency；
Step 506, after the 4th preset duration, compressor is controlled with third assigned frequency and runs the 5th preset duration；
Step 508, when air-conditioning system enters oil return mode up to the first preset duration, the first solenoid valve and the second electricity are controlled Magnet valve unlatching, the second four-way valve power down, to open the circulation of refrigerant and refrigeration oil；
Step 510, after the second preset duration, control second solenoid valve closes the 6th preset duration；
Step 512, the second four-way valve of control powers on, and control second solenoid valve is opened, and the running frequency for controlling compressor is extensive It is multiple extremely to enter the running frequency before oil return mode；
Step 514, the pressure at expulsion of compressor and the difference of back pressure are detected, it is pre- to judge whether difference is less than or equal to If pressure is, 516 are entered step, it is no, enter step 522；
Step 516, control compressor promotes running frequency and to the first assigned frequency and runs third preset duration；
Step 518, judge that controlling compressor promotes running frequency to the first assigned frequency and run third preset duration Whether number reaches predetermined number of times, is, then enters step 520, no, then return step 514；
Step 520, when difference still less than or be equal to preset pressure, then control compressor shutdown, and issue the second four-way valve Fault cues；
Step 522, oil return mode is exited.
Wherein, third assigned frequency is greater than the second assigned frequency；5th preset duration is equal to the first preset duration and the 4th The difference of preset duration.
In this embodiment, air-conditioning carry out refrigeration mode when, control the first four-way valve power down, second solenoid valve open, Second four-way valve powers on, and the high temperature and pressure refrigerant of compressor discharge reaches outdoor heat exchanger by the first four-way valve, is condensed After heat release, it is evaporated heat exchange by the electric expansion valve, the machine of entering the room that connect with outdoor heat exchanger output end, is then passed through Second solenoid valve is eventually returned to compressor into gas-liquid separator, completes the refrigeration cycle of air-conditioning system.
In any of the above-described embodiment, it is preferable that the first preset duration range is 220 seconds to 260 seconds；Second preset duration Range is 40 seconds to 80 seconds；Third preset duration range is 40 seconds to 80 seconds；4th preset duration range is 100 seconds to 140 seconds.
In this embodiment, the first preset duration, the second preset duration, third preset duration and through reasonable settings The range of four preset durations is realized and rationally adjusts oil return time and oil return control logic, realizes that air-conditioning system is efficient and stable Operation.
Illustrate a specific embodiment of the invention below with reference to Fig. 6 and Fig. 7.
In this specific embodiment, the structure of three control air-conditioning systems is as shown in fig. 6, three control air-conditioning systems include outdoor Machine system 1 and indoor unit 2 (the first indoor unit 22 and the second indoor unit 24) and indoor machine controller 3；Outdoor machine system 1 includes pressure Contracting machine 10, the first four-way valve 11, the second four-way valve 12, third four-way valve 13, the first outdoor heat exchanger 14, the second outdoor heat exchanger 15, throttle part (the first electric expansion valve 16 and the second electric expansion valve 17) and gas-liquid separator 18, outdoor check valve 19； Indoor machine controller 3 includes the first check valve 31, second one-way valve 32, third check valve 33, the 4th check valve 34, the first electromagnetism Valve 35, second solenoid valve 36, third solenoid valve 37, the 4th solenoid valve 38 and corresponding pipeline, connection relationship is such as between all parts Shown in attached drawing 6.As seen from Figure 6, it since three-pipe heating recycles special pipeline structure and control mode, is transported in refrigeration mode Third four-way valve 13 to the intermediate duct between indoor machine controller 3 is to close when row, and long-play can accumulate refrigeration oil, The reduction for causing system refrigeration oil when serious, influences whether the lubricating reliability of compressor, and then influences the fortune of entire unit Row reliability.The control method of the specific embodiment as shown in fig. 7, comprises:
Step 702, it is switched on；
Step 704, unit receives power on mode, runs according to control logic；
Step 706, whether unit enters oil return operation, is then to enter step 708, no, then return step 704；
Step 708, compressor was with assigned frequency a operation 2 minutes；
Step 710, compressor is with assigned frequency b operation, and the first four-way valve, the second four-way valve OFF, third four-way valve ON is not Become；
Step 712, unit enters whether oil return runing time is equal to 4 minutes, is then to enter step 714, no, then returns Step 710；
Step 714, third four-way valve OFF continues 60 seconds；
Step 716, third four-way valve ON；
Step 718, oil return control logic is exited；
Step 720, frequency is run before compressor restores oil return, and the first four-way valve, the second four-way valve, third four-way valve restore State before oil return；
Step 722, judge whether Pc-Pe > 0.03MPa is true, be then to enter step 704, it is no, then enter step 724；
Step 724, compressor raising frequency is run 60 seconds to assigned frequency c, and real-time monitoring row/back pressure；
Step 726, add up to execute number+1；
Step 728, judgement is accumulative executes whether number is equal to 3, is then to enter step 730, no, then enters step 724；
Step 730, compressor is out of service, exports third four-way valve fault alarm, and unit resets again, into opening again Machine state.
Wherein, Pc is Compressor Discharge Pressure, and Pe is compressor return air pressure.
In the specific embodiment, when outdoor machine system 1 receives power-on command, starting up, when refrigeration mode is run, First four-way valve 11 and the second four-way valve 12 are in OFF state, and third four-way valve 13 is on state, the height that compressor 10 is discharged Warm high pressure refrigerant reaches the first outdoor heat exchanger 14 and the second outdoor heat exchanger by the first four-way valve 11 and the second four-way valve 12 15, after carrying out condensation heat release, by the first electric expansion valve 16 and the second electric expansion valve 17, machine controller 3 is entered the room, then 2 evaporation and heat-exchange of indoor unit is reached, gas-liquid separator 18 is entered back into, is eventually returned to the compression of compressor 10, completes entire circulation.
When running to certain time, judge that unit enters oil return operating status, compressor 10 is with assigned frequency a operation 2 Minute after, the first four-way valve 11 and the second four-way valve 12OFF, third four-way valve 13ON, compressor 10 with assigned frequency b operation, The first solenoid valve 35 in indoor machine controller 3, second solenoid valve 36, third solenoid valve 37, the 4th solenoid valve 38 power on simultaneously Does ON subsequently determine whether that unit enters oil return runing time and is equal to 4 minutes? if NO, continue oil return operation, if YES, third 13 power down OFF of four-way valve continues 60 seconds, and after 13 power down OFF of third four-way valve, the high temperature that a part comes out from compressor 10 is high Pressure condition refrigerant enters intermediate duct by third four-way valve 13, passes through second solenoid valve 36 and the 4th solenoid valve 38, recycling Into gas-liquid separator 18, the circulation of refrigerant and refrigeration oil is completed；Machine controller 3 executes 36 He of second solenoid valve in 60 seconds rear chambers 4th solenoid valve 38 continues power down OFF10 seconds, and third four-way valve 13 restores power-up state ON, second solenoid valve 36 and the 4th later Solenoid valve 38 powers on, and the first solenoid valve 35 and third solenoid valve 37 continue to be kept powered on state, and subsequent unit exits oil return operation Control logic, 10 running frequency of compressor are restored to operating status before oil return, third four-way valve 13 and the first solenoid valve 35, second State before solenoid valve 36, third solenoid valve 37,38 full recovery to oil return of the 4th solenoid valve, unit enter normal operation control Logic.
Further, judge whether the difference of pressure at expulsion and back pressure is greater than 0.03MPa, i.e. Pc-Pe > 0.03MPa is No establishment? if YES, unit enters normal operation control logic；If NO, 10 raising frequency of compressor to assigned frequency c is run 60 seconds, And real-time detection row/back pressure, meanwhile, add up execute number+1, judge again at this time, i.e. Pc-Pe > 0.03MPa whether at It is vertical? if the accumulative number that executes reaches 3 times, Pc-Pe > 0.03MPa condition has not been reached yet, then compressor 10 is out of service, defeated 13 fault alarm of third four-way valve out；Unit resets again, into the standby mode that is switched on again.
10 operating frequency of compressor, the first four-way valve 11, the second four-way valve 12, third four-way are controlled in the specific embodiment The running frequency of compressor 10 after 13 reversing mode of valve and oil return rationally adjusts oil return time and oil return control logic, Make system more efficient stable reliability service.
The embodiment of second aspect of the present invention, proposes a kind of oil return control system 800, and Fig. 8 shows of the invention one The schematic block diagram of the oil return control system 800 of embodiment.As shown in figure 8, oil return control system 800 includes: memory 802, use In storage computer program；Processor 804, for execute computer program with: when air-conditioning system enters oil return mode up to first When preset duration, control the first solenoid valve and second solenoid valve open, the second four-way valve power down, to form refrigerant and refrigeration oil Circulation；After second preset duration, control the second four-way valve power on, control compressor running frequency restore to enter oil return mode Preceding running frequency；The pressure at expulsion of compressor and the difference of back pressure are detected, it is default to judge whether difference is less than or equal to Pressure；When difference is less than or equal to preset pressure, control compressor promotes running frequency to the first assigned frequency and runs the Three preset durations；And when difference is greater than the first preset pressure, exit oil return mode.
Oil return control system 800 provided by the invention, memory 802 store computer program；Processor 804 executes calculating When machine program, when air-conditioning system enters oil return the first preset duration of mode, control the first solenoid valve and second solenoid valve open, Second four-way valve power down, at this point, the refrigerant of the high-temperature high-pressure state come out from compressor enters outdoor unit by the second four-way valve Then intermediate duct between system and indoor set system is being recycled to gas by second solenoid valve and the first solenoid valve respectively Liquid/gas separator forms the circulation of refrigerant and refrigeration oil, after the second preset duration, it is contemplated that the circulation of refrigerant and refrigeration oil is completed, It then controls the second four-way valve to power on, by detecting the pressure at expulsion of compressor and the difference of back pressure, and and preset pressure value Comparison, judge whether four-way valve commutates success, if difference is not more than preset pressure value, the second four-way valve of specification commutates not Success, then the running frequency by promoting compressor forms pipeline height pressure difference, and then realize second to the first formulation frequency The commutation of four-way valve；When the difference of Compressor Discharge Pressure and back pressure is greater than preset pressure value, illustrate the second four-way valve It commutates successfully, then control system exits oil return mode, so that before four-way valve, solenoid valve, compressor etc. are restored to oil return State completes the successful switch of oil return mode and normal mode (such as refrigeration mode, heating mode).In this way, rationally controlling electromagnetism The movement of valve and four-way valve realizes the circulation of refrigerant and refrigeration oil in three control air-conditioning system intermediate ducts, avoids intermediate tube The accumulation of refrigeration oil in road, and lead to the reduction of system circulation refrigeration oil, improve compressor lubrication reliability and whole system Reliability of operation.
In the above embodiment, it is preferable that processor 804 be also used to execute computer program with: when air-conditioning system enter When oil return mode, control compressor is run with the second assigned frequency；After 4th preset duration, compressor is controlled with the specified frequency of third Rate runs the 5th preset duration；Wherein, third assigned frequency is greater than the second assigned frequency；It is default that 5th preset duration is equal to first The difference of duration and the 4th preset duration.
In this embodiment, when air-conditioning system has just entered oil return mode, first control will be at random with the second assigned frequency The 4th preset duration is run, the running frequency of compressor in the normal mode is switched into the second assigned frequency, so that compressor It is first transitioned into the second assigned frequency, then carries out improving running frequency value third assigned frequency, avoids that compressor is directly run frequency Rate is switched to higher third assigned frequency, improves the reliability of air-conditioning system.Wherein, it is default to be equal to first for the 5th preset duration The difference of duration and the 4th preset duration, that is to say, that control compressor with the second assigned frequency run certain time and then The first solenoid valve of control and second solenoid valve unlatching, the second four-way valve power down are carried out, guarantees the high-frequency operation of compressor and makes The flow velocity of refrigerant improves, so that the refrigeration oil taken out of by refrigerant takes back compressor, completes the circulation of refrigeration oil.
In any of the above-described embodiment, it is preferable that processor 804 be also used to execute computer program with: control compress Machine promotes running frequency to the first assigned frequency and after running third preset duration, repeat the pressure at expulsion for detecting compressor and The difference of back pressure judges the step of whether difference is less than or equal to preset pressure；And when control compressor promotes operation Frequency is to the first assigned frequency and when running the number of third preset duration and reaching predetermined number of times, difference still less than or be equal to default Pressure then controls compressor shutdown, and issues the fault cues of the second four-way valve.
In this embodiment, it is less than preset pressure value in the pressure at expulsion of compressor and the difference of back pressure, and controls Compressor promotes running frequency to the first assigned frequency and after running third preset duration, and difference and preset pressure are compared in repetition Value is not more than preset pressure value in difference, controls compressor promotion running frequency again and to the first assigned frequency and runs third Preset duration, to realize the commutation of the second four-way valve；When multiple (predetermined number of times) promoted running frequency to the first specified frequency Rate and after running third preset duration, difference then determines that four-way valve can not commutate still less than preset pressure, then and time control Compressor shutdown processed, and the fault cues of the second four-way valve are issued, air-conditioning system unit resets again, standby into being switched on again State avoids the failure of the second four-way valve from leading to the influence to the reliability and stability of air-conditioning system.
In any of the above-described embodiment, it is preferable that the first preset duration range is 220 seconds to 260 seconds；Second preset duration Range is 40 seconds to 80 seconds；Third preset duration range is 40 seconds to 80 seconds；4th preset duration range is 100 seconds to 140 seconds.
In this embodiment, the first preset duration, the second preset duration, third preset duration and through reasonable settings The range of four preset durations is realized and rationally adjusts oil return time and oil return control logic, realizes that air-conditioning system is efficient and stable Operation.
In any of the above-described embodiment, it is preferable that processor 804 be also used to execute computer program with: control second Before four-way valve powers on, control second solenoid valve closes the 6th preset duration；While the second four-way valve of control powers on, control Second solenoid valve is opened.
In this embodiment, it is controlling before the second four-way valve powers on, the can also be closed by control second solenoid valve Six preset durations form refrigerant and freeze the height pressure difference of oil circuit piping, realize refrigeration oil circulation, controlling the second four-way valve While powering on, control second solenoid valve is opened, and realizes the normal commutation of the second four-way valve.
In any of the above-described embodiment, it is preferable that processor 804 be also used to execute computer program with: when receive system When cold mode operation instructs, the first four-way valve power down of control, second solenoid valve are opened, the second four-way valve powers on, to form refrigeration Circulation.
In this embodiment, air-conditioning carry out refrigeration mode when, control the first four-way valve power down, second solenoid valve open, Second four-way valve powers on, and the high temperature and pressure refrigerant of compressor discharge reaches outdoor heat exchanger by the first four-way valve, is condensed After heat release, it is evaporated heat exchange by the electric expansion valve, the machine of entering the room that connect with outdoor heat exchanger output end, is then passed through Second solenoid valve is eventually returned to compressor into gas-liquid separator, completes the refrigeration cycle of air-conditioning system.
The embodiment of third aspect present invention provides a kind of computer readable storage medium, is stored thereon with computer Program, the step of method for controlling oil return in any of the above-described embodiment is realized when computer program is executed by processor.
A kind of computer readable storage medium provided by the invention is stored thereon with computer program, computer program quilt The step of processor realizes method for controlling oil return in any of the above-described embodiment when executing, thus it is complete with the method for controlling oil return Portion's technical effect, details are not described herein.
The embodiment of fourth aspect present invention provides a kind of three control air-conditioning systems 900, and Fig. 9 shows of the invention The schematic block diagram of the three control air-conditioning systems 900 of one embodiment.As shown in figure 9, three control air-conditioning systems 900 include: as above State the oil return control system 902 in any embodiment.
A kind of three control air-conditioning system 900 provided by the invention, comprising: as the oil return in above-mentioned any embodiment controls system System 902, therefore whole technical effects with the oil return control system 902, details are not described herein.
The three control air-conditioning systems of another embodiment of the invention include: the computer in above-mentioned any embodiment such as can Read storage medium.
Three control air-conditioning systems of the embodiment include: such as the computer readable storage medium in above-mentioned any embodiment, Therefore with whole technical effects of the computer readable storage medium, details are not described herein.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc. Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (14)

1. a kind of method for controlling oil return is used for three control air-conditioning systems, which is characterized in that the air-conditioning system includes: outdoor unit System and indoor set system, the outdoor machine system includes compressor, at least one outdoor heat exchanger, opposite with the heat exchanger The first four-way valve, gas-liquid separator, the second four-way valve answered；The indoor set system include at least one indoor unit, with it is described Corresponding first solenoid valve of indoor unit and second solenoid valve；Wherein, the output end of the compressor passes through first four-way valve It is connected with the input terminal of the outdoor heat exchanger；The output end of the compressor passes through second four-way valve, the interior Machine system and the intermediate duct of outdoor machine system are connected with the input terminal of the second solenoid valve；The second solenoid valve it is defeated Outlet is connected with the output end of the input terminal of the first solenoid valve, the indoor unit；The output end of first solenoid valve and institute The input terminal for stating gas-liquid separator is connected；The input terminal of the compressor of the output end of the gas-liquid separator is connected； The method for controlling oil return includes:
When the air-conditioning system enters oil return mode up to the first preset duration, first solenoid valve and second solenoid valve are controlled It opens, the second four-way valve power down, to form the circulation of refrigerant and refrigeration oil；
It after second preset duration, controls second four-way valve and powers on, the running frequency for controlling the compressor is restored to entering Running frequency before the oil return mode；
The pressure at expulsion of the compressor and the difference of back pressure are detected, judges whether the difference is less than or equal to default pressure Power；
When the difference is less than or equal to the preset pressure, controls the compressor and promote running frequency to the first specified frequency Rate simultaneously runs third preset duration；And
When the difference is greater than first preset pressure, the oil return mode is exited.
2. method for controlling oil return according to claim 1, which is characterized in that further include:
When the air-conditioning system enters the oil return mode, controls the compressor and run with the second assigned frequency；
After 4th preset duration, the compressor is controlled with third assigned frequency and runs the 5th preset duration；
Wherein, the third assigned frequency is greater than second assigned frequency；It is pre- that 5th preset duration is equal to described first If the difference of duration and the 4th preset duration.
3. method for controlling oil return according to claim 1, which is characterized in that promote running frequency controlling the compressor To the first assigned frequency and after running third preset duration, further includes:
The pressure at expulsion of the detection compressor and the difference of back pressure are repeated, judges whether the difference is less than or waits In the preset pressure the step of；And
When the control compressor promotes running frequency to the first assigned frequency and runs the number of third preset duration and reaches When to predetermined number of times, the difference still less than or be equal to the preset pressure, then control compressor shutdown, and issue described second The fault cues of four-way valve.
4. method for controlling oil return according to claim 2, which is characterized in that
The first preset duration range is 220 seconds to 260 seconds；
The second preset duration range is 40 seconds to 80 seconds；
The third preset duration range is 40 seconds to 80 seconds；
The 4th preset duration range is 100 seconds to 140 seconds.
5. method for controlling oil return according to any one of claim 1 to 4, which is characterized in that further include:
Before control second four-way valve powers on, controls the second solenoid valve and close the 6th preset duration；
While control second four-way valve powers on, controls the second solenoid valve and open.
6. method for controlling oil return according to any one of claim 2 to 4, which is characterized in that the air-conditioning system into Before entering the oil return mode, further includes:
When receiving refrigeration mode operating instruction, the first four-way valve power down of control, second solenoid valve are opened, on the second four-way valve Electricity, to form refrigeration cycle.
7. a kind of oil return control system is used for three control air-conditioning systems, which is characterized in that the air-conditioning system includes: outdoor unit System and indoor set system, the outdoor machine system includes compressor, at least one outdoor heat exchanger, opposite with the heat exchanger The first four-way valve, gas-liquid separator, the second four-way valve answered；The indoor set system include at least one indoor unit, with it is described Corresponding first solenoid valve of indoor unit and second solenoid valve；Wherein, the output end of the compressor passes through first four-way valve It is connected with the input terminal of the outdoor heat exchanger；The output end of the compressor passes through second four-way valve, the interior Machine system and the intermediate duct of outdoor machine system are connected with the input terminal of the second solenoid valve；The second solenoid valve it is defeated Outlet is connected with the output end of the input terminal of the first solenoid valve, the indoor unit；The output end of first solenoid valve and institute The input terminal for stating gas-liquid separator is connected；The input terminal of the compressor of the output end of the gas-liquid separator is connected； The oil return control system includes:
Memory, for storing computer program；
Processor, for execute the computer program with:
When the air-conditioning system enters oil return mode up to the first preset duration, first solenoid valve and second solenoid valve are controlled It opens, the second four-way valve power down, to form the circulation of refrigerant and refrigeration oil；
It after second preset duration, controls second four-way valve and powers on, the running frequency for controlling the compressor is restored to entering Running frequency before the oil return mode；
The pressure at expulsion of the compressor and the difference of back pressure are detected, judges whether the difference is less than or equal to default pressure Power；
When the difference is less than or equal to the preset pressure, controls the compressor and promote running frequency to the first specified frequency Rate simultaneously runs third preset duration；And
When the difference is greater than first preset pressure, the oil return mode is exited.
8. oil return control system according to claim 7, which is characterized in that the processor is also used to execute the calculating Machine program with:
When the air-conditioning system enters the oil return mode, controls the compressor and run with the second assigned frequency；
After 4th preset duration, the compressor is controlled with third assigned frequency and runs the 5th preset duration；
Wherein, the third assigned frequency is greater than second assigned frequency；It is pre- that 5th preset duration is equal to described first If the difference of duration and the 4th preset duration.
9. oil return control system according to claim 7, which is characterized in that the processor is also used to execute the calculating Machine program with:
Running frequency is promoted to the first assigned frequency and after running third preset duration controlling the compressor, described in repetition The pressure at expulsion of the compressor and the difference of back pressure are detected, judges whether the difference is less than or equal to preset pressure Step；And
When the control compressor promotes running frequency to the first assigned frequency and runs the number of third preset duration and reaches When to predetermined number of times, the difference still less than or be equal to the preset pressure, then control compressor shutdown, and issue described second The fault cues of four-way valve.
10. oil return control system according to claim 8, which is characterized in that
The first preset duration range is 220 seconds to 260 seconds；
The second preset duration range is 40 seconds to 80 seconds；
The third preset duration range is 40 seconds to 80 seconds；
The 4th preset duration range is 100 seconds to 140 seconds.
11. oil return control system according to any one of claims 7 to 10, which is characterized in that the processor is also used In execute the computer program with:
Before control second four-way valve powers on, controls the second solenoid valve and close the 6th preset duration；
While control second four-way valve powers on, controls the second solenoid valve and open.
12. according to the described in any item oil return control systems of claim 7 to 10, which is characterized in that the processor is also used to Execute the computer program with:
When receiving refrigeration mode operating instruction, the first four-way valve power down of control, second solenoid valve are opened, on the second four-way valve Electricity, to form refrigeration cycle.
13. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program It is realized when being executed by processor as described in any one of claims 1 to 6 the step of method for controlling oil return.
14. a kind of three control air-conditioning systems characterized by comprising the oil return control as described in any one of claim 7 to 12 System processed or computer readable storage medium as claimed in claim 13.
CN201811276640.XA 2018-10-30 2018-10-30 Oil return control method and system, storage medium and three-pipe air conditioning system Active CN109405353B (en)

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CN114440408A (en) * 2021-12-09 2022-05-06 海信（山东）空调有限公司 Four-way valve control method and device for multi-split air conditioner and multi-split air conditioner
CN114440408B (en) * 2021-12-09 2023-10-31 海信空调有限公司 Four-way valve control method and device for one-to-many air conditioner and one-to-many air conditioner
CN115950067A (en) * 2022-12-05 2023-04-11 珠海格力电器股份有限公司 Air conditioning system, oil return control method and device thereof, and storage medium

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