CN114234465A - High-low temperature environment test box refrigerating system adopting multi-channel evaporator - Google Patents
High-low temperature environment test box refrigerating system adopting multi-channel evaporator Download PDFInfo
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- CN114234465A CN114234465A CN202111614964.1A CN202111614964A CN114234465A CN 114234465 A CN114234465 A CN 114234465A CN 202111614964 A CN202111614964 A CN 202111614964A CN 114234465 A CN114234465 A CN 114234465A
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- 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
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B41/40—Fluid line 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
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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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- Control Of Temperature (AREA)
Abstract
The invention provides a high-low temperature environmental test box refrigerating system adopting a multi-channel evaporator, which is provided with a cascade refrigerating system consisting of high-low temperature refrigerating loops, and can adopt different refrigerating modes such as cascade refrigeration, single-stage refrigeration and the like to reach different target temperatures. The system adopts a multi-channel evaporator, and is characterized in that the single-stage refrigeration and a hot gas bypass branch share the area of the evaporator, and high-temperature hot gas bypass is used for replacing electric heating compensation, so that the volume of the evaporator and an environmental test box body can be greatly reduced on the premise of meeting the temperature control of the whole region, and the energy consumption of the system is reduced. And bypass branches are respectively arranged in the high-temperature-level refrigeration loop and the low-temperature-level refrigeration loop, so that the temperature of each loop can be cooperatively adjusted. Compared with the traditional electric heating opposite-flushing cooling capacity mode, the temperature is more uniform, the temperature fluctuation degree is smaller, meanwhile, the energy consumption of a refrigerating system can be greatly reduced, and the energy-saving and environment-friendly effects are achieved.
Description
Technical Field
The invention belongs to the technical field of test detection equipment, and particularly relates to a high-low temperature environment test box refrigerating system adopting a multi-channel evaporator.
Background
The environmental test chamber is a device for manually simulating specific environment for aerospace products, information electronic instruments and meters, materials, electricians, electronic products and various electronic elements to perform performance tests. Because the environment test box has a large working temperature area, a large capacity of the refrigeration compressor and a large heating capacity, the electric heating test box needs to carry out more heat compensation, so that more electric energy is consumed and the environment is not green. The environment test box adopting bypass adjustment can achieve the effects of environmental protection and energy saving, but in order to ensure the adjustment precision, the internal components are more, the system is complex, the volume of the box body is increased, and the reliability is lower.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a high and low temperature environment test chamber refrigeration system using a multi-channel evaporator, which can improve the universality of a high and low temperature test apparatus and achieve the purpose of energy saving, and the present invention adopts the following technical solutions:
the invention provides a high-low temperature environment test box refrigerating system adopting a multi-channel evaporator, which is communicated with a high-low temperature test box and used for adjusting the temperature and the humidity in the high-low temperature test box, and is characterized by comprising the following components: the high-temperature refrigeration loop is provided with a high-temperature refrigeration main loop and is formed by a high-temperature compressor, a first stop valve, a high-temperature condenser, a liquid storage tank, a second stop valve, a first drying filter, a first electromagnetic valve, a first throttling device, a condensation evaporator and a third stop valve which are sequentially communicated; the low-temperature stage refrigeration loop is provided with a low-temperature stage refrigeration main loop and is formed by a low-temperature stage compressor, a fifth stop valve, the high-temperature stage condenser, the condensing evaporator, a third electromagnetic valve, a third throttling device, a low-temperature stage evaporator and a sixth stop valve which are sequentially communicated; the single-stage refrigeration loop is formed by a sixth electromagnetic valve, a sixth throttling device, a first three-way valve, the low-temperature-stage evaporator, a second three-way valve and a first one-way valve which are sequentially communicated, the sixth electromagnetic valve is communicated with the first drying filter, the first three-way valve and the second three-way valve are respectively communicated with two ends of a second flow passage of the low-temperature-stage evaporator, and the first one-way valve is communicated with a third stop valve; and a first hot gas bypass branch, which comprises a seventh electromagnetic valve, a second three-way valve, a low-temperature evaporator, a first three-way valve and a second one-way valve which are sequentially communicated, wherein the seventh electromagnetic valve is connected with the first stop valve, the second one-way valve is connected with the first drying filter, the high-temperature refrigeration loop and the low-temperature refrigeration loop are connected through the condensing evaporator to form a cascade refrigeration loop for cascade refrigeration, and the first hot gas bypass branch is used for adjusting the temperature of the cascade refrigeration loop.
The high-low temperature environmental test box refrigeration system adopting the multichannel evaporator provided by the invention also has the technical characteristics that the high-temperature level refrigeration loop further comprises a second thermal bypass branch, which is formed by a fourth stop valve, a second electromagnetic valve and a second throttling device which are sequentially communicated and used for adjusting the refrigeration temperature of the high-temperature level refrigeration loop.
The high-low temperature environmental test chamber refrigeration system adopting the multi-channel evaporator provided by the invention can also have the technical characteristics that the low-temperature stage refrigeration loop further comprises: the third thermal bypass branch is formed by a fourth electromagnetic valve and a fourth throttling device which are sequentially communicated; and the low-temperature-stage cold bypass branch is formed by a second drying filter, a fifth electromagnetic valve and a fifth throttling device which are sequentially communicated, and the third hot bypass branch and the low-temperature-stage cold bypass branch are used for cooperatively adjusting the refrigerating temperature of the low-temperature-stage refrigerating circuit.
The high-low temperature environment test box refrigerating system adopting the multichannel evaporator provided by the invention also has the technical characteristics that the high-temperature stage refrigerating circuit adopts medium-temperature refrigerant, and the low-temperature stage refrigerating circuit adopts low-temperature refrigerant.
The high-low temperature environmental test box refrigerating system adopting the multichannel evaporator provided by the invention can also have the technical characteristics that the low-temperature stage evaporator is a multichannel evaporator, an internal coil pipe of the multichannel evaporator is divided into a first flow passage with a large number of tube rows and a second flow passage with a small number of tube rows, two ends of the first flow passage are respectively connected with a third throttling device and a sixth stop valve, and two ends of the second flow passage are respectively connected with a first three-way valve and a second three-way valve.
The high-low temperature environmental test chamber refrigerating system adopting the multi-channel evaporator provided by the invention can also have the technical characteristics, wherein the single-stage refrigeration circuit and the first hot gas bypass branch share an evaporator area of the second flow passage in different cycles, thereby reducing a volume of the evaporator, in a single-stage refrigeration cycle, the refrigerant flows from the first dry filter sequentially through the sixth electromagnetic valve, the sixth throttling device and the first three-way valve into the second flow passage, and then sequentially through the second three-way valve and the second one-way valve back to the high-temperature stage compressor, in the cascade refrigeration cycle, the medium-temperature refrigerant bypasses the second flow passage from the high-temperature stage compressor through the seventh electromagnetic valve and the second three-way valve, and then flows into the first dry filter through the first three-way valve and the second one-way valve.
Action and Effect of the invention
The high-low temperature environment test box refrigerating system adopting the multichannel evaporator is provided with the cascade refrigerating system consisting of the high-low temperature refrigerating circuit, the single-stage refrigerating circuit and the first hot gas bypass branch for adjusting the refrigerating temperature of the cascade refrigerating system, so that different refrigerating modes such as cascade refrigeration, single-stage refrigeration and the like can be adopted, and different target temperatures can be achieved in the high-low temperature environment test box. The system of the invention adopts a multi-channel evaporator, and the single-stage refrigeration loop and the first hot gas bypass branch share the evaporator area, so that the volume of the evaporator and the volume of the box body of the environmental test box can be greatly reduced; the high-temperature-level hot gas bypass is used for replacing electric heating compensation, and the energy consumption of the system can be reduced on the premise of meeting the requirement of full-interval temperature control. Therefore, when the high-low temperature environment test box system of the multi-channel evaporator provides a temperature-controllable test environment for the piece to be tested, the temperature in the test box can be converted at any stage of high temperature, normal temperature and low temperature, and the cooling rate and the refrigerating capacity can be adjusted to meet various requirements of a user for testing the piece to be tested.
In conclusion, the high-low temperature environment test box refrigerating system adopting the multi-channel evaporator can rapidly regulate and control the refrigerating capacity and the heat under different working conditions so as to match the load requirements, thereby improving the energy efficiency and reducing the volumes of the evaporator and the refrigerating system. Compared with the traditional electric heating opposite-flushing cooling capacity mode, the temperature is more uniform, the temperature fluctuation degree is smaller, and the energy consumption of the system is reduced.
Drawings
FIG. 1 is a schematic diagram of a high and low temperature environmental test chamber refrigeration system employing a multi-channel evaporator according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of an evaporator in the embodiment of the present invention.
Reference numerals:
a high-temperature stage compressor 101; a first shut-off valve 102; a high temperature stage condenser 103; a reservoir 104; a second cut-off valve 105; a first dry filter 106; a first electromagnetic valve 107; a first throttling means 108; a condenser-evaporator 109; a third stop valve 110; a fourth cut-off valve 111; a second solenoid valve 112; a second throttling device 113; a low-temperature stage compressor 201; a fifth cut-off valve 202; a third electromagnetic valve 203; a third throttling means 204; a low-temperature stage evaporator 205; a sixth cut-off valve 206; a fourth solenoid valve 207; a fourth throttle device 208; a second dry filter 209; a fifth solenoid valve 210; a fifth throttle device 211; a sixth solenoid valve 301; a sixth throttling means 302; a first three-way valve 303; a second three-way valve 304; a first check valve 305; a seventh solenoid valve 401; a second one-way valve 402; a first orifice 501; a second nozzle 502; a third nozzle 503; a fourth port 504; a second flow channel 505; a first flow channel 506.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiment and the accompanying drawings are used for specifically describing the high and low temperature environment test box refrigerating system adopting the multi-channel evaporator.
< example >
The embodiment provides a high-low temperature environment test box refrigerating system adopting a multi-channel evaporator, which is communicated with a high-low temperature environment test box and used for adjusting the temperature in the box, and can improve the universality of a high-low temperature test device and achieve the purpose of energy conservation.
Fig. 1 is a schematic structural diagram of a high-low temperature environment test chamber refrigeration system adopting a multi-channel evaporator in the embodiment of the invention.
As shown in fig. 1, the high and low temperature environment test chamber refrigerating system using the multi-channel evaporator of the present embodiment includes: the high-temperature-stage refrigeration circuit, the low-temperature-stage refrigeration circuit, the single-stage refrigeration circuit and the first heat bypass branch.
The high-temperature refrigeration loop comprises a high-temperature refrigeration main loop and a second hot bypass branch, the high-temperature refrigeration main loop is used for keeping the temperature in the refrigerator to be higher, and the second hot bypass branch is used for adjusting the refrigeration temperature of the high-temperature refrigeration main loop.
The high-temperature stage refrigeration main loop is formed by a high-temperature stage compressor 101, a first stop valve 102, a high-temperature stage condenser 103, a liquid storage tank 104, a second stop valve 105, a first drying filter 106, a first electromagnetic valve 107, a first throttling device 108, a condensation evaporator 109 and a third stop valve 110 which are connected in sequence.
The second thermal bypass branch is formed by a fourth cut-off valve 111, a second solenoid valve 112, and a second throttle device 113 that are communicated in this order, wherein the fourth cut-off valve 111 is also communicated with the first cut-off valve 102, and the second throttle device 113 is also communicated with the condensing evaporator 109.
In this embodiment, a medium-temperature refrigerant is used in the high-temperature stage refrigeration circuit. In the high-temperature stage refrigeration main loop, high-temperature high-pressure refrigerant steam from the high-temperature stage compressor 101 is condensed by the high-temperature stage condenser 103, becomes liquid, flows through the liquid storage tank 104 and the first drying filter 106 in sequence, is throttled into low-temperature low-pressure refrigerant in the first throttling device 108, absorbs heat by the condensation evaporator 109, is evaporated into gas, and flows back to the high-temperature stage compressor 101.
The low-temperature-level refrigeration loop comprises a low-temperature-level refrigeration main loop, a third hot bypass branch and a low-temperature-level cold bypass branch. The low-temperature-level refrigeration main loop is used for keeping the temperature in the box to be lower, and the third hot bypass branch and the low-temperature-level cold bypass branch are used for adjusting the refrigeration temperature of the low-temperature-level refrigeration main loop in a coordinated mode.
The low-temperature-stage refrigeration main circuit is formed by a low-temperature-stage compressor 201, a fifth shutoff valve 202, a high-temperature-stage condenser 103, a condensing evaporator 109, a third electromagnetic valve 203, a third throttling device 204, a low-temperature-stage evaporator 205, and a sixth shutoff valve 206, which are connected in this order.
The low-temperature-stage refrigeration circuit and the high-temperature-stage refrigeration circuit are connected by the same condensing evaporator 109, and a cascade refrigeration circuit for cascade refrigeration is formed.
The third thermal bypass branch comprises a fourth solenoid valve 207 and a fourth throttling device 208 which are communicated in sequence, wherein the fourth solenoid valve 207 is also communicated with the high-temperature-stage condenser 103, and the fourth throttling device 208 is also communicated with a sixth stop valve 206.
The low-temperature stage cold bypass branch is formed by a second dry filter 209, a fifth electromagnetic valve 210 and a fifth throttling device 211 which are communicated in sequence, wherein the second dry filter 209 is also communicated with the condensing evaporator 109, and the fifth throttling device 211 is also communicated with a sixth stop valve 206.
In this embodiment, a low-temperature refrigerant is used in the low-temperature stage refrigeration circuit. The vapor of the low-temperature refrigerant from the low-temperature stage compressor 201 is pre-cooled by the high-temperature stage condenser 103, then condensed in the condensing evaporator 109, throttled into a low-temperature low-pressure refrigerant in the third throttling device 204, and then evaporated into a gas by absorbing heat in the evaporator 205, and then returned to the low-temperature stage compressor 201.
The single-stage refrigeration circuit is configured to perform single-stage refrigeration, and is formed by a sixth solenoid valve 301, a sixth throttling device 302, a first three-way valve 303, a low-temperature-stage evaporator 205, a second three-way valve 304, and a first check valve 305, which are sequentially communicated, wherein the sixth solenoid valve 301 is communicated with the first dry filter 106, and the first check valve 305 is communicated with the third cut-off valve 110.
When the required refrigeration temperature in the tank is high, a single-stage refrigeration loop can be directly adopted for refrigeration, the low-temperature stage refrigeration loop does not work, the high-temperature stage compressor 101 works normally, the high-temperature refrigerant coming out of the high-temperature stage compressor 101 is condensed by the high-temperature stage condenser 103, becomes liquid and flows through the liquid storage tank 104 and the first drying filter 106, is throttled by the sixth throttling device 302, flows into the second flow channel of the low-temperature stage evaporator 205, is evaporated into gas, and then returns to the inlet of the high-temperature stage compressor 101, so that the single-stage refrigeration cycle is completed.
The first thermal bypass branch is used for adjusting the refrigeration temperature of the cascade refrigeration system and is formed by a seventh electromagnetic valve 401, a second three-way valve 304, a low-temperature-stage evaporator 205, a first three-way valve 303 and a second one-way valve 402 which are sequentially communicated, wherein the seventh electromagnetic valve 401 is connected with the first stop valve 102, and the second one-way valve 402 is connected with the first dry filter 106.
When the required cooling capacity demand of the cascade refrigeration cycle decreases, the high temperature and high pressure refrigerant vapor from the high temperature stage compressor 101 bypasses the first hot bypass branch to the second line of the low temperature stage evaporator 205. Meanwhile, in the low-temperature refrigeration loop, the low-temperature refrigerant from the third throttling device 204 enters the first pipeline of the evaporator 205, the refrigerants in the two channels exchange heat in the low-temperature-stage evaporator to offset part of cold energy of the cascade refrigeration cycle, so that the effect of adjusting the evaporation temperature of the cascade refrigeration cycle is achieved, and on the premise that the temperature fluctuation degree is smaller, the energy consumption of the refrigeration system is greatly reduced, the energy is saved, and the environment is protected.
Further, the second hot bypass branch, the third hot bypass branch and the low-temperature cold bypass branch are used for assisting in adjusting the refrigerating capacity of the high-temperature refrigerating circuit and the low-temperature refrigerating circuit in the cascade refrigerating cycle and the suction temperature of the compressor.
Specifically, when the demand of the high-temperature stage refrigeration circuit is reduced, the high-temperature refrigerant from the high-temperature stage compressor 101 is throttled by the second throttling device 113 and then bypassed to the condensing evaporator 110, and the high-temperature stage refrigeration capacity is adjusted by the second thermal bypass branch.
When the demand of the low-temperature-stage refrigeration loop is reduced, a part of low-temperature-stage refrigerant steam precooled by the high-temperature-stage condenser 103 is throttled by the fourth throttling device 208 and then bypasses the low-temperature-stage compressor 201, and the low-temperature-stage refrigeration capacity is adjusted by the third thermal bypass branch; in addition, when the cooling capacity demand is lower or the suction temperature is too high, the refrigerant condensed from the condenser-evaporator 109 is filtered by the second dry filter 209 and throttled by the fifth throttling device 211 and then bypasses to the low-temperature stage compressor 201, and the low-temperature stage cooling capacity is adjusted by the low-temperature stage cold bypass branch.
FIG. 2 is a schematic view of the structure of an evaporator in the embodiment of the present invention.
As shown in fig. 2, the low temperature stage evaporator 205 of the present embodiment is a multi-channel evaporator, and the internal piping thereof is divided into two parts, namely a first flow passage 506 of a first nozzle 501 and a second nozzle 502, and a second flow passage 505 of a third nozzle 503 and a fourth nozzle 504, wherein the number of rows of tubes of the first flow passage 506 is large, and the number of rows of tubes of the second flow passage 505 is small.
In the cascade refrigeration, low-temperature refrigerant is sucked into a first flow channel 506 from a first pipe orifice 501, evaporated and absorbed, and then discharged from a second pipe orifice 502, meanwhile, high-temperature refrigerant is sucked into a second flow channel 505 from a third pipe orifice 503, and is discharged from a fourth pipe orifice 504 after part of cold energy from the first flow channel 506 is absorbed, so that the effect of consuming the cold energy of the cascade refrigeration part is achieved; in single stage refrigeration, the refrigerant from the filter-drier enters the second flow path 505 from the fourth port 504 and exits the port 503 after the evaporation process.
In this embodiment, the second flow channel 505 of the low-temperature stage evaporator 205 belongs to the evaporator area shared by the single-stage refrigeration circuit and the first heat bypass branch. In the single-stage refrigeration cycle, the refrigerant from the sixth throttling device 302 is evaporated in the second flow passage 505 in the low-temperature-stage evaporator 205; in the cascade refrigeration cycle, the high-temperature and high-pressure refrigerant from the high-temperature stage compressor 101 releases heat in the second flow passage 505 of the low-temperature stage evaporator 205 through the first hot gas bypass branch, and absorbs the heat of the low-temperature refrigerant from the first flow passage 506, so that the volume of the evaporator and the environmental test chamber box body can be greatly reduced.
In summary, in this embodiment, according to the requirement of the target refrigeration temperature and humidity in the box body, different refrigeration effects can be achieved through different refrigeration modes such as the cascade refrigeration mode and the single-stage refrigeration mode, and the refrigeration modes can be freely switched and controlled. When the target temperature in the box body is low or the temperature needs to be quickly reduced in the starting stage, refrigerating by adopting a high-low temperature cascade refrigeration mode; when the target temperature in the box body is higher, a single-stage refrigeration mode is adopted for refrigeration. Therefore, the energy-saving operation of the refrigeration system can be realized through the above mode switching.
Examples effects and effects
According to the high-low temperature environmental test box refrigeration system adopting the multichannel evaporator provided by the embodiment, because the cascade refrigeration circulation loop and the single-stage refrigeration loop which are composed of the high-temperature-stage refrigeration loop and the low-temperature-stage refrigeration loop are arranged, the free switching control of cascade refrigeration and single-stage refrigeration can be realized, and the energy-saving operation of the refrigeration system is realized.
In addition, the high low temperature environmental test case refrigerating system who adopts multichannel evaporimeter of this embodiment is through the cooperation regulation of first hot bypass branch road, second hot bypass branch road, third hot bypass branch road and cold bypass branch road, for the piece that awaits measuring provides the controllable test environment of temperature for the temperature in the proof box can be in high temperature, normal atmospheric temperature, microthermal arbitrary stage conversion, can also adjust cooling rate and refrigerating output, in order to satisfy the multiple demand that the user is used for testing the piece that awaits measuring. And the high-temperature-level hot gas bypass is used for replacing electric heating compensation, so that the temperature is more uniform, the temperature fluctuation degree is smaller, the energy consumption of a refrigeration system can be greatly reduced, and the energy-saving and environment-friendly effects are realized.
In addition, the second flow channel of the evaporator in the energy-saving high-low temperature environmental test box refrigerating system of the embodiment is the area of the evaporator shared by the single-stage refrigeration and the hot gas bypass branch, and the volume of the evaporator and the volume of the environmental test box body can be greatly reduced on the premise of meeting the temperature control of the whole region.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.
Claims (6)
1. The utility model provides an adopt high low temperature environmental test case refrigerating system of multichannel evaporimeter, with high low temperature test case intercommunication for adjust temperature and humidity in the high low temperature test case, its characterized in that includes:
the high-temperature refrigeration loop is provided with a high-temperature refrigeration main loop and is formed by a high-temperature compressor, a first stop valve, a high-temperature condenser, a liquid storage tank, a second stop valve, a first drying filter, a first electromagnetic valve, a first throttling device, a condensation evaporator and a third stop valve which are sequentially communicated;
the low-temperature stage refrigeration loop is provided with a low-temperature stage refrigeration main loop and is formed by a low-temperature stage compressor, a fifth stop valve, the high-temperature stage condenser, the condensing evaporator, a third electromagnetic valve, a third throttling device, a low-temperature stage evaporator and a sixth stop valve which are sequentially communicated;
the single-stage refrigeration loop is formed by a sixth electromagnetic valve, a sixth throttling device, a first three-way valve, a low-temperature-stage evaporator, a second three-way valve and a first one-way valve which are sequentially communicated, the sixth electromagnetic valve is communicated with the first drying filter, the first three-way valve and the second three-way valve are respectively communicated with two ends of a second flow passage of the low-temperature-stage evaporator, and the first one-way valve is communicated with a third stop valve; and
the first hot gas bypass branch is formed by a seventh electromagnetic valve, a second three-way valve, a low-temperature-stage evaporator, a first three-way valve and a second one-way valve which are sequentially communicated, the seventh electromagnetic valve is connected with the first stop valve, the second one-way valve is connected with the first drying filter,
wherein the high-temperature-stage refrigeration loop and the low-temperature-stage refrigeration loop are connected through the condensing evaporator to form a cascade refrigeration loop for cascade refrigeration,
the first hot gas bypass branch is used for adjusting the temperature of the cascade refrigeration loop.
2. The system of claim 1, wherein:
the high-temperature refrigeration loop further comprises a second thermal bypass branch, which is formed by a fourth stop valve, a second electromagnetic valve and a second throttling device which are sequentially communicated and used for adjusting the refrigeration temperature of the high-temperature refrigeration loop.
3. The system of claim 1, wherein:
wherein the low temperature stage refrigeration circuit further comprises:
the third thermal bypass branch is formed by a fourth electromagnetic valve and a fourth throttling device which are sequentially communicated; and
the low-temperature stage cold bypass branch is formed by a second drying filter, a fifth electromagnetic valve and a fifth throttling device which are sequentially communicated,
the third hot bypass branch and the low-temperature-level cold bypass branch are used for adjusting the refrigerating temperature of the low-temperature-level refrigerating circuit.
4. The system of claim 1, wherein:
wherein, the high-temperature stage refrigeration loop adopts medium-temperature refrigerant,
and a low-temperature refrigerant is adopted in the low-temperature stage refrigeration loop.
5. The high and low temperature environmental test chamber refrigerating system using the multi-channel evaporator as set forth in claim 4, wherein:
the low-temperature evaporator is a multichannel evaporator, an internal coil of the multichannel evaporator is divided into a first flow channel with a large number of tube rows and two flow channels with a small number of tube rows, two ends of the first flow channel are respectively connected with a third throttling device and a sixth stop valve, and two ends of the second flow channel are respectively connected with a first three-way valve and a second three-way valve.
6. The high and low temperature environmental test chamber refrigerating system using the multi-channel evaporator according to claim 5, wherein:
wherein the single-stage refrigeration circuit and the first hot gas bypass branch share the evaporator area of the second runner under different working conditions, so as to reduce the volume of the low-temperature stage evaporation,
in a single-stage refrigeration cycle, the refrigerant flows from the first dry filter sequentially through the sixth electromagnetic valve, the sixth throttling device and the first three-way valve into the second flow passage, and then sequentially through the second three-way valve and the second one-way valve back to the high-temperature stage compressor,
in a cascade refrigeration cycle, the medium-temperature refrigerant bypasses the second flow passage from the high-temperature stage compressor through the first stop valve, the seventh electromagnetic valve and the second three-way valve, and then flows into the first dry filter through the first three-way valve and the second one-way valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111614964.1A CN114234465B (en) | 2021-12-27 | 2021-12-27 | High-low temperature environment test box refrigerating system adopting multichannel evaporator |
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| CN202111614964.1A CN114234465B (en) | 2021-12-27 | 2021-12-27 | High-low temperature environment test box refrigerating system adopting multichannel evaporator |
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| CN114234465B (en) | 2023-08-29 |
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