CN109028629A - A kind of carbon dioxide refrigerating medium refrigeration system and its refrigerating method - Google Patents
A kind of carbon dioxide refrigerating medium refrigeration system and its refrigerating method Download PDFInfo
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- CN109028629A CN109028629A CN201810603098.8A CN201810603098A CN109028629A CN 109028629 A CN109028629 A CN 109028629A CN 201810603098 A CN201810603098 A CN 201810603098A CN 109028629 A CN109028629 A CN 109028629A
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- 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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- 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
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- 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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- 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
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- 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
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- 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
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
- F25B2339/024—Evaporators with refrigerant in a vessel in which is situated a heat exchanger
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- 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
- F25B2600/13—Pump speed control
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- 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
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- 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
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a kind of carbon dioxide refrigerating medium refrigeration systems, including refrigerant circulation loop, carbon dioxide recycle circuit, defrosting circulation loop and lubricating oil cooling circuit.The carbon dioxide refrigerating medium refrigeration system makes full use of the cooling capacity of heat of compressor and refrigerant, and low energy consumption, and cost is small.And the present invention improves flooded evaporator, the installation space for needing it is small, and the heat exchange efficiency between refrigerant and refrigerating medium is high；And maintenance unit is had, there is multiple measure to prevent system pressure excessively high, to improve security and stability.The present invention can be used for a variety of application environments such as workshop, freezer, refrigerator-freezer.Also disclosed herein is the refrigerating methods of the carbon dioxide refrigerating medium refrigeration system.
Description
Technical field
The present invention relates to refrigeration system technical field, in particular to a kind of carbon dioxide refrigerating medium refrigeration system and its
Refrigerating method.
Background technique
In recent years, the environmental problems such as depletion of the ozone layer and greenhouse effects are more and more prominent, this produces very refrigeration industry
Big influence.Currently, CFC refrigerant is disabled, HFC and HCFC refrigerant is also being phased out, therefore uses Novel ring
It protects refrigerant and refrigeration system is imperative.
Natural refrigerant CO2 is due to its good environmental index, as nontoxic, non-combustible, and consume ozone latent energy value (ODP) and is
0, global warming potential (GWP) is only 1, in addition its good chemical stability, will not decomposite at high temperature
Poisonous gas becomes preferred refrigerant goal in research once again.
It is NH that application is more at present3/CO2Folding type cooling system, but the system will use CO in low temperature side2Pressure
Contracting machine, to cause cooling system coefficient (COP) lower.CN204421413U and CN205227902U are disclosed with CO2As load
The NH of cryogen3Refrigeration system, CO2By NH3Refrigerating evaporator is reached by pump circulation after cooling to cool down to cold, is not only solved
Ammonia also reduces system energy consumption as some security hidden troubles of refrigerant bring.
But there are still certain defects for carbon dioxide refrigerating medium refrigeration system.Firstly, the Defrost method master of refrigerating evaporator
If electric defrosting, water defrosting, hot gas defrosting, wherein electric defrosting consumes a large amount of electric energy, the mode of water defrosting makes at low ambient temperatures
It is easy to appear that ice is stifled or defrosting is not thorough the used time.The method of existing hot gas defrosting needs the additional device for increasing offer hot gas and sets
Standby, control system is more complicated, and cost is higher.
Currently, flooded evaporator is saved energy and is widely used due to heat transfer efficiency height.But flooded evaporator is more
Refrigerant feed liquid is realized using gravity, needs to build higher computer room, increases equipment cost.And due to only leaning on compressor will
It is siphoned away by thermal evaporation refrigerant to provide interior circulation, the refrigerant temperature in flooded evaporator is unevenly distributed, is unfavorable for
Heat exchange with refrigerating medium carries out.
Therefore, it needs one kind that can improve Defrost method in the industry and improves refrigerant feed liquid mode, and improve heat transfer effect
The carbon dioxide refrigerating medium refrigeration system of rate.
Summary of the invention
The present invention provides a kind of carbon dioxide refrigerating medium refrigeration system in view of the above-mentioned drawbacks of the prior art, including
Refrigerant circulation loop, carbon dioxide recycle circuit, defrosting circulation loop and lubricating oil cooling circuit,
The refrigerant circulation loop includes compressor, oil eliminator, condenser, siphon pipe, refrigerant liquid storage device, electronic expansion
The top refrigerant outlet of valve, flooded evaporator and pressure-regulating valve, flooded evaporator is connected by pressure-regulating valve pipeline
It is connected to compressor, the outlet line of compressor is connected to oil eliminator, and the refrigerant outlet of oil eliminator passes through triple valve pipeline
It is connected to condenser, condenser is connected to refrigerant liquid storage device by siphon pipe pipeline, and refrigerant liquid storage device is through electric expansion valve
It is connected to the refrigerant inlet of flooded evaporator；
The carbon dioxide recycle circuit includes flooded evaporator, carbon dioxide liquid storage device, carbon dioxide pump and refrigeration evaporator
Device, the outlet line of carbon dioxide condensing pipe is connected to the entrance of carbon dioxide liquid storage device, carbon dioxide in flooded evaporator
The outlet of liquid storage device is connected with carbon dioxide pump, and carbon dioxide pump is connected to refrigeration through cold carbon dioxide liquid supply electromagnetic valve pipeline and steams
Device is sent out, the outlet of refrigerating evaporator is connected to carbon dioxide condensing in flooded evaporator through carbon dioxide discharge solenoid valve pipeline
The entrance of pipe；
The defrosting circulation loop has defrost refrigerant side and carbon dioxide side, and the defrost refrigerant side includes oil separation
The refrigerant inlet line of device, refrigerant defrost solenoid valve, defrost heat exchanger and refrigerant liquid storage device, defrost heat exchanger connects system
The outlet of cryogen defrost solenoid valve, the triple valve pipeline between the entrance and oil eliminator and condenser of refrigerant defrost solenoid valve
Connection, the refrigerant outlet pipeline of defrost heat exchanger are connected to the entrance of refrigerant liquid storage device, the top gas of refrigerant liquid storage device
Body outlet is connect with the suction line of condenser, and the carbon dioxide side includes carbon dioxide liquid storage device, defrost heat exchanger, dioxy
Change be carbonized white solenoid valve, refrigerating evaporator and flooded evaporator, the outlet line of carbon dioxide liquid storage device to be connected to defrost and change
The carbon dioxide outlet of the carbon dioxide entrance of hot device, defrost heat exchanger is connected to refrigeration through carbon dioxide defrost solenoid valve pipeline
Evaporator, the outlet line of refrigerating evaporator are connected to the entrance of the carbon dioxide condensing pipe of flooded evaporator；
The lubricating oil cooling circuit has the cooling refrigerant side of lubricating oil and lubricating oil side, the cooling refrigeration of the lubricating oil
Agent side includes condenser, siphon pipe and oil cooler, and siphon pipe pipeline is connected to the refrigerant inlet of oil cooler, oil cooler
Refrigerant outlet pipeline be connected to the entrance of condenser, the lubricating oil side includes compressor, oil eliminator and oil cooler,
The lubricating oil outlet pipeline of oil eliminator is connected to the lubricating oil inlet of oil cooler, and the lubricating oil outlet pipeline of oil cooler connects
It is connected to the lubricating oil inlet of compressor,
In the flooded evaporator, the carbon dioxide refrigerating medium in the carbon dioxide recycle circuit is in carbon dioxide condensing pipe
Middle flowing, the carbon dioxide condensing pipe are immersed in the refrigerant from the refrigerant circulation loop, thus carbon dioxide
Heat exchange occurs with refrigerant；
The defrost refrigerant side of the refrigerant circulation loop and the defrosting circulation loop by oil eliminator and condenser it
Between triple valve and refrigerant defrost solenoid valve between pipeline be connected to, and pass through the refrigerant outlet and system of defrost heat exchanger
Pipeline between cryogen liquid storage device entrance is connected to, the titanium dioxide in the carbon dioxide recycle circuit and the defrosting circulation loop
Carbon side is connected to by the pipeline between carbon dioxide reservoir outlet and the carbon dioxide entrance of defrost heat exchanger, and passing through
Pipeline between the carbon dioxide outlet of white heat exchanger and refrigerating evaporator is connected to；
The cooling refrigerant side of the lubricating oil of the refrigerant circulation loop and the lubricating oil cooling circuit passes through siphon pipe
Pipeline between the refrigerant inlet of oil cooler is connected to, and passes through the refrigerant outlet of oil cooler and entering for condenser
Pipeline between mouthful is connected to,
Wherein, the flooded evaporator is externally provided with refrigerant circulation pump, the entrance of the refrigerant circulation pump and the full liquid
The refrigerant outlet of formula base of evaporator is connected, the outlet of the refrigerant circulation pump and the flooded evaporator inner top
Spray thrower is connected.
Further, fluid level controller is equipped in the flooded evaporator, the fluid level controller is arranged from bottom to up
There are 4 liquid level sensors, and the fluid level controller is electrically connected by control system and controls the electric expansion valve and the system
Refrigerant cycle pump.
Further, the flooded evaporator is equipped with oil return injector, and the oil return opening of the oil return injector protrudes into institute
It states inside flooded evaporator, and the air inlet of the oil return injector is connected to oil eliminator by oil return injection solenoid valve
The gas outlet of refrigerant outlet, the oil return injector is connected to the entrance of pressure-regulating valve.
Further, the carbon dioxide liquid storage device, which is equipped with, maintains unit, and the maintenance unit shuts down when institute for preventing
State hypertonia in carbon dioxide liquid storage device.
Further, the refrigerating evaporator is equipped with hot carbon dioxide gas supply vacuum solenoid valve, cold carbon dioxide feed flow electricity
Magnet valve, carbon dioxide discharge solenoid valve and carbon dioxide valve for pressure difference, the entrance of the hot carbon dioxide gas supply vacuum solenoid valve with
The outlet of the carbon dioxide defrost solenoid valve is connected, the entrance and the carbon dioxide of the cold carbon dioxide liquid supply electromagnetic valve
The outlet of pump is connected, outlet and the institute of hot carbon dioxide the gas supply vacuum solenoid valve and the cold carbon dioxide liquid supply electromagnetic valve
The entrance for stating refrigerating evaporator is connected, the entrance of carbon dioxide discharge solenoid valve and the carbon dioxide valve for pressure difference with it is described
The outlet of refrigerating evaporator is connected, the outlet of the carbon dioxide discharge solenoid valve and the carbon dioxide valve for pressure difference with it is described full
The carbon dioxide entrance of solution type evaporator is connected.
Further, the refrigerating evaporator is equipped with sensor, and the sensor is electrically connected to the control system,
Under cooling condition, the control system opens the cold carbon dioxide liquid supply electromagnetic valve and carbon dioxide discharge electricity
Magnet valve closes the hot carbon dioxide gas supply vacuum solenoid valve and the carbon dioxide valve for pressure difference；
Under defrost operating condition, the control system closes the cold carbon dioxide liquid supply electromagnetic valve and carbon dioxide discharge electricity
Magnet valve opens the hot carbon dioxide gas supply vacuum solenoid valve and the carbon dioxide valve for pressure difference.
Further, the refrigerant liquid storage device top export is connect with the suction line of the condenser.
It is parallel relationship between the refrigerating evaporator when number of the refrigerating evaporator is more than one.
Further, the shell of the flooded evaporator has outer wall and inner wall, and the inner wall is equipped with multiple outlets
Hole has outlet chamber, the refrigerant of the outlet chamber and the flooded evaporator top between the outer wall and the inner wall
Outlet.
In carbon dioxide refrigerating medium refrigeration system of the invention, refrigerant is preferably ammonia.
The present invention also provides a kind of carbon dioxide refrigerating medium refrigerating methods, including refrigerant circulation, carbon dioxide recycle, change
Frost circulation and lubricating oil cooling cycle,
In the refrigerant circulation, refrigerant compression is high-temperature high-pressure refrigerant gas, and the gas enters in oil eliminator,
With the lubricating oil separation being carried out from compressor, the refrigerant gas enters condenser condensation liquefaction after separation, through siphon
Pipe enters refrigerant liquid storage device, then enters flooded evaporator after electric expansion valve is depressured, and the refrigerant liquid is described
Heat exchange, which occurs, with carbon dioxide refrigerating medium in flooded evaporator becomes refrigerant gas, and the refrigerant gas is through pressure tune
Section valve returns compressor, completes circulation；
In the carbon dioxide recycle, it is laggard that carbon dioxide refrigerating medium is condensed into liquid by refrigerant in flooded evaporator
Enter carbon dioxide liquid storage device, after enter in refrigerating evaporator through carbon dioxide pump, and cold generation heat exchange, heat absorption mutually becomes
Flooded evaporator is returned to after gas to condense again, completes circulation；
In defrost circulation, in defrost refrigerant side, a part of high-temperature high-pressure refrigerant gas from oil eliminator exists
Into before condenser, enter defrost heat exchanger through triple valve and refrigerant defrost solenoid valve, is returned after heating carbon dioxide liquid
To refrigerant liquid storage device, in carbon dioxide side, a part of carbon dioxide liquid from carbon dioxide liquid storage device enters defrost and changes
Hot device is heated by refrigerant gas, is then entered refrigerating evaporator through carbon dioxide defrost solenoid valve and is carried out defrost, later dioxy
Change carbon returns to flooded evaporator and condenses again, and the carbon dioxide liquid of condensation reaches carbon dioxide liquid storage device and completes circulation；
In the lubricating oil cooling cycle, in the cooling refrigerant side of lubricating oil, carry out the part of refrigerant liquid of condenser
It is left from siphon pipe, into the lubricating oil separated in oil eliminator is heated in oil cooler, the refrigerant is returned to cold later
Condenser condenses completion circulation again, and in lubricating oil side, the lubricating oil from compressor is separated in oil eliminator with refrigerant, it
Entering afterwards and heat exchange occurs in oil cooler with refrigerant liquid, lubricating oil after cooling returns to compressor and completes circulation,
The refrigerant circulation and the carbon dioxide recycle are interacted in the flooded evaporator by heat exchange；
Part of refrigerant in the refrigerant circulation enters the defrost refrigerant side of defrost circulation, the carbon dioxide
A part of carbon dioxide in circulation enters the carbon dioxide side in defrost circulation, some refrigerant and the part
In the defrost heat exchanger heat exchange occurs for carbon dioxide；
Part of refrigerant in the refrigerant circulation enters the cooling refrigerant of the lubricating oil in the lubricating oil cooling cycle
With lubricating oil heat exchange occurs for side in the oil cooler.
It should be noted that being generated in pipeline when the high-temperature high-pressure refrigerant gas high speed that compressor generates is entered in condenser
Negative pressure driving the refrigerant gas from oil cooler and refrigerant liquid storage device return to condenser.
Beneficial effects of the present invention are as follows:
High-temperature high-pressure refrigerant gas that defrost heat exchanger is generated using compressor heats carbon dioxide refrigerating medium, steams to refrigeration
It sends out device and carries out defrost, the heat for not only having made full use of refrigerant extra, but also without using additional defrost medium, both reduce energy consumption,
Cost is reduced again.
In addition, flooded evaporator is externally provided with circulating pump, can make in flooded evaporator for impregnating the refrigeration of condenser pipe
Agent circulation, to make the Temperature Distribution of refrigerant, more evenly the heat transfer efficiency between carbon dioxide refrigerating medium is higher.And it follows
The negative pressure driving refrigerant that ring pump generates enters flooded evaporator from refrigerant liquid storage device, to push entire refrigerant circulation
Progress drive refrigerant circulation using gravity there is no need to build higher computer room, save great amount of cost and space.
Top is additionally provided with spray equipment in flooded evaporator, can uniformly spray the refrigerant of circulation to not impregnating in the refrigerant
Carbon dioxide condensing pipe improves heat transfer rate.
Detailed description of the invention
Fig. 1 show the schematic diagram of carbon dioxide refrigerating medium refrigeration system of the invention.
In figure, 1, compressor；2, oil eliminator；3, condenser；4, oil cooler；5, siphon pipe；6, refrigerant liquid storage device；
7, flooded evaporator；8, electric expansion valve；9, refrigerant circulation pumps；10, carbon dioxide liquid storage device；11, carbon dioxide pump；
12, hot carbon dioxide supplies vacuum solenoid valve；13, cold carbon dioxide liquid supply electromagnetic valve；14, refrigerating evaporator；15, carbon dioxide
Solenoid valve is discharged；16, carbon dioxide valve for pressure difference；17, unit is maintained；18, defrost heat exchanger；19, carbon dioxide defrost solenoid valve；
20, refrigerant defrost solenoid valve；21, oil return injector；22, oil return injection solenoid valve；23, fluid level controller；24, pressure is adjusted
Valve；25, oil return opening.
Specific embodiment
For a better understanding of the present invention, below with specific example come the technical solution that the present invention will be described in detail, but this
Invention is not limited thereto.
Embodiment 1
The present embodiment illustrates a kind of carbon dioxide refrigerating medium refrigeration system, and using ammonia as refrigerant, carbon dioxide is as refrigerating
Agent.
Referring to Fig. 1, the refrigeration system includes refrigerant circulation loop, carbon dioxide recycle circuit, defrosting circulation loop
With lubricating oil cooling circuit.
The refrigerant circulation loop includes 2 compressors 1 in parallel, oil eliminator 2, condenser 3, siphon pipe 5, refrigeration
Agent liquid storage device 6, electric expansion valve 8, flooded evaporator 7 and pressure-regulating valve 24.The top refrigerant of flooded evaporator 7 goes out
Mouth is connected to compressor 1 by 24 pipeline of pressure-regulating valve, and the outlet line of compressor 1 is connected to oil eliminator 2, oil eliminator
2 refrigerant outlet is connected to condenser 3 by triple valve pipeline, and condenser 3 is connected to refrigerant by 5 pipeline of siphon pipe and stores up
Liquid device 6, refrigerant liquid storage device 6 are connected to the refrigerant inlet of flooded evaporator 7 through electric expansion valve 8.
The carbon dioxide recycle circuit includes flooded evaporator 7, carbon dioxide liquid storage device 10,11 and of carbon dioxide pump
4 refrigerating evaporators 14 in parallel.The outlet line of carbon dioxide condensing pipe is connected to carbon dioxide storage in flooded evaporator 7
The outlet of the entrance of liquid device 10, carbon dioxide liquid storage device 10 is connected with carbon dioxide pump 11, and carbon dioxide pump 11 is through cold titanium dioxide
13 pipeline of carbon liquid supply electromagnetic valve is connected to refrigerating evaporator 14, and solenoid valve 15 is discharged through carbon dioxide in the outlet of refrigerating evaporator 14
Pipeline is connected to the entrance of carbon dioxide condensing pipe in flooded evaporator 7.
In the flooded evaporator 7, the carbon dioxide refrigerating medium in the carbon dioxide recycle circuit is in carbon dioxide
It is flowed in condenser pipe, the carbon dioxide condensing pipe is immersed in the liquefied ammonia from the refrigerant circulation loop, thus dioxy
Change carbon and heat exchange occurs for liquefied ammonia；
The defrosting circulation loop includes defrost heat exchanger 18, carbon dioxide defrost solenoid valve 19, refrigerant defrost solenoid valve 20,
And refrigerating evaporator 14 and the hot carbon dioxide at its both ends supply vacuum solenoid valve 12 and carbon dioxide valve for pressure difference 16.Defrost is changed
Hot device 18, refrigerant defrost solenoid valve 20 and oil eliminator 2 and refrigerant liquid storage device 6 form defrost refrigerant side.Defrost heat exchange
The outlet of the refrigerant inlet line connection refrigerant defrost solenoid valve 20 of device 18, the entrance and oil of refrigerant defrost solenoid valve 20
Triple valve pipeline connection between separator 2 and condenser 3, the refrigerant outlet pipeline of defrost heat exchanger 18 are connected to refrigerant
The head gas outlet of the entrance of liquid storage device 6, refrigerant liquid storage device 6 is connect with the suction line of condenser 3.Defrost heat exchanger 18
Vacuum solenoid valve 12, carbon dioxide pressure difference are supplied with carbon dioxide defrost solenoid valve 19 and refrigerating evaporator 14, hot carbon dioxide
Valve 16, flooded evaporator 7 and carbon dioxide liquid storage device 10 form carbon dioxide side.The outlet line of carbon dioxide liquid storage device 10
It is connected to the carbon dioxide entrance of defrost heat exchanger 18, the carbon dioxide outlet of defrost heat exchanger 18 is through carbon dioxide defrost electromagnetism
Valve 19 and hot carbon dioxide gas supply 12 pipeline of vacuum solenoid valve are connected to refrigerating evaporator 14, the outlet two of refrigerating evaporator 14
16 pipeline of carbonoxide valve for pressure difference is connected to the entrance of the carbon dioxide condensing pipe of flooded evaporator 7.
Refrigerating evaporator 14 is equipped with sensor, and the sensor is electrically connected to the control system.Under cooling condition, the control
System processed opens cold carbon dioxide liquid supply electromagnetic valve 13 and solenoid valve 15 is discharged in the carbon dioxide, carries the carbon dioxide of condensation
Cryogen enters in refrigerating evaporator 14 to freeze with cold heat exchange, simultaneously closes off hot carbon dioxide gas supply vacuum solenoid valve 12 and described
Carbon dioxide valve for pressure difference 16；Under defrost operating condition, the control system closes cold carbon dioxide liquid supply electromagnetic valve 13, steams in refrigeration
It after sending out the cold carbon dioxide discharge of residue in device 14, closes carbon dioxide and solenoid valve 15 is discharged, open hot carbon dioxide gas supply and subtract
Pressure electromagnetic valve 12 and carbon dioxide valve for pressure difference 16.
The lubricating oil cooling circuit includes oil cooler 4.Oil cooler 4 and condenser 3 and siphon pipe 5 composition moisten
Lubricating oil cools down refrigerant side.5 pipeline of siphon pipe is connected to the refrigerant inlet of oil cooler 4, the refrigerant outlet of oil cooler 4
Pipeline is connected to the entrance of condenser 3.Oil cooler 4 and oil eliminator 2 and compressor 1 form lubricating oil side.Oil eliminator 2
Lubricating oil outlet pipeline is connected to the lubricating oil inlet of oil cooler 4, and the lubricating oil outlet pipeline of oil cooler 4 is connected to compression
The lubricating oil inlet of machine 1.
Further, flooded evaporator 7 is externally provided with refrigerant circulation pump 9, is equipped with top spray in flooded evaporator 7
Device.The suction line of refrigerant circulation pump 9 is connected to the refrigerant outlet of 7 bottom of flooded evaporator, refrigerant circulation pump 9
Outlet line is connected to the entrance of the top spray device.Refrigerant circulation pump 9 follows the liquefied ammonia of 7 bottom of flooded evaporator again
Ring is sprayed to and is exposed on the heat exchanger tube in 7 headspace of flooded evaporator to the top of flooded evaporator 7, with side
It helps liquefied ammonia temperature-averaging in evaporator to be distributed, improves heat exchange efficiency.In addition, the shell of flooded evaporator 7 has outer wall and interior
Wall, the inner wall be equipped with multiple ventholes, between the outer wall and the inner wall have outlet chamber, the outlet chamber with it is described
The refrigerant outlet on 7 top of flooded evaporator is connected to.Liquefied ammonia in evaporator is in heat exchanging process by thermogenetic gas
It can be entered in outlet chamber by the venthole, and evaporator is left through refrigerant outlet by outlet chamber.Make liquefied ammonia in this way
In bubble the downstream rate of sprayed liquefied ammonia will not be hindered by the uplink in evaporator, to improve the spray of evaporator
Heat exchange efficiency.
In addition, being equipped with fluid level controller 23 in flooded evaporator 7, the fluid level controller 23 is in 4 from bottom to up
Position a, b, c and d are respectively arranged liquid level sensor, and the fluid level controller 23 is swollen by control system electrical connection control electronics
Swollen valve 8 and refrigerant circulation pump 9.Normal level should should open electronics when liquid level drops to position a or b between position b and c
8 feed flow of expansion valve, and if liquid level drop to position a also and should stop refrigerant circulation pump 9.Electricity can be closed when liquid level rises to position c
Sub- expansion valve 8 stops feed flow, illustrates that electric expansion valve 8 or other devices are likely to occur failure if liquid level rises to position d, should stop
Machine overhauling waits the liquid ammonia gasification in evaporator 7 to be discharged.The presence of fluid level controller improves the safety of whole system operation
Property and continuity.
In addition, flooded evaporator 7 is equipped with oil return injector 21, the oil return opening 25 of the oil return injector 21 protrudes into described
Inside flooded evaporator 7, and the air inlet of the oil return injector 21 is connected to oily separation by oil return injection solenoid valve 22
The gas outlet of the refrigerant outlet of device 2, the oil return injector 21 is connected to the entrance of pressure-regulating valve 24.Compressor 1 generates
High speed and high pressure gas rapidly flow through oil return injector 21, negative pressure is generated wherein, by the profit in liquefied ammonia in flooded evaporator 7
Lubricating oil siphons away.Therefore oil return injector can prevent lubricating oil from influencing heat exchange in evaporator, and improve lubrication oil recovery rate, save
Cost.
In addition, carbon dioxide liquid storage device 10 be equipped with maintain unit 17, maintain unit 17 have generator special, compressor,
Condenser and safety valve.Maintain unit 17 that can start dedicated generator when refrigeration system powers off, with the compressor of itself
With the liquid of carbon dioxide in condenser carbon dioxide liquid storage device 10, carbon dioxide heating gasification caused by preventing because of power-off,
Hypertonia generates safety problem, and maintains the safety valve of unit 17 that can also discharge a part of gas when over pressure, comes
Safe pressure in maintenance system, to significantly improve the safety of refrigeration system.
Embodiment 2
The present embodiment illustrates a kind of carbon dioxide refrigerating medium refrigerating method, including refrigerant circulation, carbon dioxide recycle, defrost follow
Ring and lubricating oil cooling cycle.
In refrigerant circulation, it is inhaled into after the liquid ammonia gasification in flooded evaporator 7 by the refrigerant outlet on top
In compressor 1, ammonia compression is high temperature and pressure ammonia by compressor 1.The ammonia enters in oil eliminator 2, and with from compression
The lubrication separation of oil being carried out in machine 1, isolated lubricating oil leave oil eliminator 2 and enter in oil cooler 4.High temperature and pressure
Ammonia leaves oil eliminator 2, into being condensed into liquefied ammonia in condenser 3.Liquefied ammonia enters refrigerant liquid storage device 6 by siphon pipe 5, it
It is depressured afterwards by electric expansion valve 8, into flooded evaporator 7, for condensing the carbon dioxide as refrigerating medium.Later, it inhales
The refrigerant outlet that the ammonia that heat mutually becomes gas passes through 7 top of flooded evaporator again returns in compressor 1, completes circulation.
In carbon dioxide recycle, titanium dioxide is entered by the carbon dioxide that ammonia condensing is liquid in flooded evaporator 7
In carbon liquid storage device 10, then under the action of carbon dioxide pump 11, refrigeration is entered by cold carbon dioxide liquid supply electromagnetic valve 13 and is steamed
It sends out in device 14, with cold generation heat exchange, is freezed by mutually becoming gas.Carbon dioxide gas is discharged through carbon dioxide later
Solenoid valve 15 leaves refrigerating evaporator 14, returns in the carbon dioxide condensing pipe of flooded evaporator 7, and heat occurs with ammonia again and hands over
It changes, completes circulation.
If the sensor in refrigerating evaporator 14 monitors frosting occur in refrigerating evaporator 14, will be sent out to control system
The number of delivering letters, control system close carbon dioxide pump 11 and cold carbon dioxide liquid supply electromagnetic valve 13, carbon dioxide are made not enter back into system
In cold evaporator 14.After a period of time, cold carbon dioxide closes carbon dioxide and electromagnetism is discharged after being discharged in refrigerating evaporator 14
Valve 15, and hot carbon dioxide gas supply vacuum solenoid valve 12 and carbon dioxide valve for pressure difference 16 are opened, make to pass through in defrost heat exchanger 18
The carbon dioxide of hot ammonia heating, which enters, carries out defrost in refrigerating evaporator 14.
In defrost circulation, in defrost refrigerant side, a part of high temperature and pressure ammonia from oil eliminator 2 is cold in entrance
Before condenser 3, enter defrost heat exchanger 18 through triple valve and refrigerant defrost solenoid valve 20, heating comes from carbon dioxide liquid storage device
10 carbon dioxide liquid, ammonia become gas-liquid mixture, leave defrost heat exchanger 18 and reach in refrigerant liquid storage device 6.Defrost
The refrigerant inlet end of heat exchanger 18 and the pressure difference of outlet end drive this circulation to carry out.Liquid in the gas-liquid mixture of ammonia will
Into flooded evaporator 7, gas will be returned in condenser 3 from the outlet of the head gas of refrigerant liquid storage device 6 and be condensed again.
In carbon dioxide side, carbon dioxide liquid enters in defrost heat exchanger 18 from carbon dioxide liquid storage device 10, through high temperature
The heating of high pressure ammonia, becomes hot carbon dioxide, then in the pressure difference of hot carbon dioxide and cold carbon dioxide in refrigerating evaporator 14
Under the action of, enter in refrigerating evaporator 14 through carbon dioxide defrost solenoid valve 19 and hot carbon dioxide gas supply vacuum solenoid valve 12
Carry out defrost.Vacuum solenoid valve 12 can be supplied by hot carbon dioxide set the stream that hot carbon dioxide enters in refrigerating evaporator 14
Amount.Carbon dioxide is returned in flooded evaporator 7 through carbon dioxide valve for pressure difference 16 and is condensed again later.Carbon dioxide valve for pressure difference 16
The carbon dioxide for flowing out refrigerating evaporator 14 can be made to keep the gas-liquid mixture state compared with low pressure, in case system pressure is excessive.
In lubricating oil cooling cycle, in the cooling refrigerant side of lubricating oil, the liquefied ammonia that a part condenses in condenser 3 from
Siphon pipe 5 leaves, and into the lubricating oil from oil eliminator 2 is heated in oil cooler 4, returns to condenser 3 later and condenses again.
In lubricating oil side, the lubricating oil separated in oil eliminator 2 with ammonia enters oil cooler 4, by the cooling refrigerant side of lubricating oil
Liquefied ammonia it is cooling, be then return in compressor 1, complete circulation.
When the high temperature and pressure ammonia high speed that compressor 1 generates is entered in condenser 3, generated in the inlet of condenser 3 negative
Pressure, ammonia of the driving from oil cooler 4 and refrigerant liquid storage device 6 return in condenser 3.
Keep the pressure in carbon dioxide liquid storage device 10 in 13 kg.f/cm2Hereinafter, temperature keeps below -31 DEG C.
The present invention improves carbon dioxide refrigerating medium refrigeration system, makes full use of the cooling capacity of heat of compressor and refrigerant, energy
Consume low, cost is small；Flooded evaporator is improved, the installation space needed is small, and the heat exchange efficiency between refrigerant and refrigerating medium is high；
In addition, the refrigerant liquid that oil cooler is condensed using a part can save energy consumption, reduce cost come cutting oil.
In addition, refrigeration of the pressure differential from oil cooler and refrigerant liquid storage device generated using higher pressure refrigerant gas
Agent gas returns to condenser, so that no setting is required equipment such as additional transfer tube, can further reduce the cost.
Moreover, multiple refrigerating evaporator parallel connections individually to carry out defrost to the refrigerating evaporator of frosting, remaining refrigeration
Evaporator can continue to run, without shutting down entire refrigeration system.
The above description is only a preferred embodiment of the present invention, can not limit the scope of the invention, in spirit of the invention
Any modifications, equivalent replacements, and improvements etc. with making in principle, all falls within the scope of the present invention.
Claims (10)
1. a kind of carbon dioxide refrigerating medium refrigeration system, which is characterized in that returned including refrigerant circulation loop, carbon dioxide recycle
Road, defrosting circulation loop and lubricating oil cooling circuit,
The refrigerant circulation loop includes compressor (1), oil eliminator (2), condenser (3), siphon pipe (5), refrigerant storage
Liquid device (6), electric expansion valve (8), flooded evaporator (7) and pressure-regulating valve (24), the top system of flooded evaporator (7)
Cryogen outlet is connected to compressor (1) by pressure-regulating valve (24) pipeline, and the outlet line of compressor (1) is connected to oily separation
The refrigerant outlet of device (2), oil eliminator (2) is connected to condenser (3) by triple valve pipeline, and condenser (3) passes through siphon
Pipe (5) pipeline is connected to refrigerant liquid storage device (6), and refrigerant liquid storage device (6) is connected to full-liquid type through electric expansion valve (8) and evaporates
The refrigerant inlet of device (7)；
The carbon dioxide recycle circuit includes flooded evaporator (7), carbon dioxide liquid storage device (10), carbon dioxide pump (11)
With refrigerating evaporator (14), the outlet line of carbon dioxide condensing pipe is connected to carbon dioxide liquid storage in flooded evaporator (7)
The outlet of the entrance of device (10), carbon dioxide liquid storage device (10) is connected with carbon dioxide pump (11), and carbon dioxide pump (11) is through cold
Carbon dioxide liquid supply electromagnetic valve (13) pipeline is connected to refrigerating evaporator (14), and the outlet of refrigerating evaporator (14) is through carbon dioxide
Discharge solenoid valve (15) pipeline is connected to the entrance of carbon dioxide condensing pipe in flooded evaporator (7)；
The defrosting circulation loop has defrost refrigerant side and carbon dioxide side, and the defrost refrigerant side includes oil eliminator
(2), refrigerant defrost solenoid valve (20), defrost heat exchanger (18) and refrigerant liquid storage device (6), the refrigeration of defrost heat exchanger (18)
Agent suction line connects the outlet of refrigerant defrost solenoid valve (20), the entrance and oil eliminator of refrigerant defrost solenoid valve (20)
(2) the triple valve pipeline connection between condenser (3), the refrigerant outlet pipeline of defrost heat exchanger (18) are connected to refrigerant
The head gas outlet of the entrance of liquid storage device (6), refrigerant liquid storage device (6) is connect with the suction line of condenser (3), and described two
Carbonoxide side includes carbon dioxide liquid storage device (10), defrost heat exchanger (18), carbon dioxide defrost solenoid valve (19), refrigeration evaporator
Device (14) and flooded evaporator (7), the outlet line of carbon dioxide liquid storage device (10) are connected to the two of defrost heat exchanger (18)
The carbon dioxide outlet of carbonoxide entrance, defrost heat exchanger (18) is connected to refrigeration through carbon dioxide defrost solenoid valve (19) pipeline
Evaporator (14), the outlet line of refrigerating evaporator (14) are connected to entering for the carbon dioxide condensing pipe of flooded evaporator (7)
Mouthful；
The lubricating oil cooling circuit has the cooling refrigerant side of lubricating oil and lubricating oil side, the cooling refrigeration of the lubricating oil
Agent side includes condenser (3), siphon pipe (5) and oil cooler (4), and siphon pipe (5) pipeline is connected to the refrigeration of oil cooler (4)
Agent entrance, the refrigerant outlet pipeline of oil cooler (4) are connected to the entrance of condenser (3), and the lubricating oil side includes compression
Machine (1), oil eliminator (2) and oil cooler (4), the lubricating oil outlet pipeline of oil eliminator (2) are connected to oil cooler (4)
The lubricating oil outlet pipeline of lubricating oil inlet, oil cooler (4) is connected to the lubricating oil inlet of compressor (1),
In the flooded evaporator (7), the carbon dioxide refrigerating medium in the carbon dioxide recycle circuit is cold in carbon dioxide
It is flowed in solidifying pipe, the carbon dioxide condensing pipe is immersed in the refrigerant from the refrigerant circulation loop, thus dioxy
Change carbon and heat exchange occurs for refrigerant；
The defrost refrigerant side of the refrigerant circulation loop and the defrosting circulation loop passes through oil eliminator (2) and condenser
(3) pipeline between triple valve and refrigerant defrost solenoid valve (20) between is connected to, and passes through defrost heat exchanger (18)
Pipeline between refrigerant outlet and refrigerant liquid storage device (6) entrance is connected to, the carbon dioxide recycle circuit and describedization
The carbon dioxide side of white circulation loop exports to enter with the carbon dioxide of defrost heat exchanger (18) by carbon dioxide liquid storage device (10)
Pipeline between mouthful is connected to, and the pipe between the carbon dioxide outlet and refrigerating evaporator (14) for passing through defrost heat exchanger (18)
Line is connected to；
The cooling refrigerant side of the lubricating oil of the refrigerant circulation loop and the lubricating oil cooling circuit passes through siphon pipe
(5) pipeline between the refrigerant inlet of oil cooler (4) is connected to, and by the refrigerant outlet of oil cooler (4) with
Pipeline between the entrance of condenser (3) is connected to,
Wherein, the flooded evaporator (7) is externally provided with refrigerant circulation pump (9), the entrance of refrigerant circulation pump (9) with
The refrigerant outlet of flooded evaporator (7) bottom is connected, the outlet of the refrigerant circulation pump (9) and the full-liquid type
The spray thrower of evaporator (7) inner top is connected.
2. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the flooded evaporator
(7) fluid level controller (23) are equipped in, the fluid level controller (23) is disposed with 4 liquid level sensors from bottom to up, and described
Fluid level controller (23) is electrically connected by control system and controls the electric expansion valve (8) and refrigerant circulation pump (9).
3. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the flooded evaporator
(7) oil return injector (21) are equipped with, the oil return opening (25) of the oil return injector (21) protrudes into the flooded evaporator (7)
Portion, and the air inlet of the oil return injector (21) is connected to the refrigeration of oil eliminator (2) by oil return injection solenoid valve (22)
Agent outlet, the gas outlet of the oil return injector (21) is connected to the entrance of pressure-regulating valve (24).
4. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the carbon dioxide liquid storage device
(10) it is equipped with and maintains unit (17).
5. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the refrigerating evaporator (14)
Solenoid valve is discharged equipped with hot carbon dioxide gas supply vacuum solenoid valve (12), cold carbon dioxide liquid supply electromagnetic valve (13), carbon dioxide
(15) and carbon dioxide valve for pressure difference (16), the hot carbon dioxide supply entrance and the carbon dioxide defrost of vacuum solenoid valve (12)
The outlet of solenoid valve (19) is connected, entrance and the carbon dioxide pump (11) of the cold carbon dioxide liquid supply electromagnetic valve (13)
Outlet is connected, the outlet of hot carbon dioxide gas supply vacuum solenoid valve (12) and the cold carbon dioxide liquid supply electromagnetic valve (13)
It is connected with the entrance of the refrigerating evaporator (14), carbon dioxide discharge solenoid valve (15) and the carbon dioxide valve for pressure difference
(16) entrance is connected with the outlet of the refrigerating evaporator (14), carbon dioxide discharge solenoid valve (15) and the dioxy
The outlet for changing carbon pressure difference limen (16) is connected with the carbon dioxide entrance of the flooded evaporator (7).
6. carbon dioxide refrigerating medium refrigeration system according to claim 5, which is characterized in that the refrigerating evaporator (14)
Equipped with sensor, the sensor is electrically connected to the control system,
Under cooling condition, the control system opens the cold carbon dioxide liquid supply electromagnetic valve (13) and carbon dioxide row
Hot carbon dioxide gas supply vacuum solenoid valve (12) and the carbon dioxide valve for pressure difference (16) are closed in solenoid valve (15) out；
Under defrost operating condition, the control system closes the cold carbon dioxide liquid supply electromagnetic valve (13) and carbon dioxide row
Hot carbon dioxide gas supply vacuum solenoid valve (12) and the carbon dioxide valve for pressure difference (16) are opened in solenoid valve (15) out.
7. carbon dioxide refrigerating medium refrigeration system described according to claim 1 or 5 or 6, which is characterized in that the refrigeration evaporator
It is parallel relationship between the refrigerating evaporator (14) when the number of device (14) is more than one.
8. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the flooded evaporator
(7) shell has outer wall and inner wall, and the inner wall is equipped with multiple ventholes, has between the outer wall and the inner wall
Air cavity, the outlet chamber are connected to the refrigerant outlet on the flooded evaporator (7) top.
9. carbon dioxide refrigerating medium refrigeration system according to claim 1, which is characterized in that the refrigerant is ammonia.
10. a kind of carbon dioxide refrigerating medium refrigerating method, which is characterized in that including refrigerant circulation, carbon dioxide recycle, defrost
Circulation and lubricating oil cooling cycle,
In the refrigerant circulation, refrigerant enters through compressor (1) boil down to high-temperature high-pressure refrigerant gas, the gas
In oil eliminator (2), with the lubricating oil separation being carried out from compressor (1), the refrigerant gas enters condensation after separation
Device (3) condensation liquefaction enters refrigerant liquid storage device (6) through siphon pipe (5), then enters full liquid after electric expansion valve (8) decompression
Formula evaporator (7), the refrigerant liquid occur heat exchange with carbon dioxide refrigerating medium in the flooded evaporator (7) and become
For refrigerant gas, the refrigerant gas returns compressor (1) through pressure-regulating valve (24), completes circulation；
In the carbon dioxide recycle, carbon dioxide refrigerating medium is condensed into liquid by refrigerant in flooded evaporator (7)
Afterwards enter carbon dioxide liquid storage device (10), after through carbon dioxide pump (11) enter refrigerating evaporator (14) in, with cold occur
Heat exchange, heat absorption mutually becomes returning to flooded evaporator (7) after gas to be condensed again, completes circulation；
In defrost circulation, in defrost refrigerant side, a part of high-temperature high-pressure refrigerant gas of oil eliminator (2) is come from
Before entering condenser (3), enters defrost heat exchanger (18) through triple valve and refrigerant defrost solenoid valve (20), heat dioxy
Refrigerant liquid storage device (6) are returned to after changing carbon liquid body, in carbon dioxide side, come from a part of dioxy of carbon dioxide liquid storage device (10)
Change carbon liquid body enters defrost heat exchanger (18) and is heated by refrigerant gas, then enters through carbon dioxide defrost solenoid valve (19) and makes
Cold evaporator (14) carries out defrost, and carbon dioxide returns to flooded evaporator (7) and condenses again later, the carbon dioxide liquid of condensation
Body reaches carbon dioxide liquid storage device (10) and completes circulation；
In the lubricating oil cooling cycle, in the cooling refrigerant side of lubricating oil, carry out the part of refrigerant liquid of condenser (3)
Body leaves from siphon pipe (5), the lubricating oil separated in oil eliminator (2) into the middle heating of oil cooler (4), later the system
Cryogen returns to condenser (3) and condenses completion circulation again, and in lubricating oil side, the lubricating oil from compressor (1) is in oil eliminator
(2) it is separated in refrigerant, enters in oil cooler (4) heat exchange, lubricating oil after cooling occurs with refrigerant liquid later
It returns to compressor (1) and completes circulation, the refrigerant circulation and the carbon dioxide recycle are in the flooded evaporator (7)
It is interacted by heat exchange；
Part of refrigerant in the refrigerant circulation enters the defrost refrigerant side of defrost circulation, the carbon dioxide
A part of carbon dioxide in circulation enters the carbon dioxide side in defrost circulation, some refrigerant and the part
Heat exchange occurs in the defrost heat exchanger (18) for carbon dioxide；
Part of refrigerant in the refrigerant circulation enters the cooling refrigerant of the lubricating oil in the lubricating oil cooling cycle
With lubricating oil heat exchange occurs for side in the oil cooler (4).
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