CN113405269A - Refrigerating system and control method thereof - Google Patents
Refrigerating system and control method thereof Download PDFInfo
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- CN113405269A CN113405269A CN202110795547.5A CN202110795547A CN113405269A CN 113405269 A CN113405269 A CN 113405269A CN 202110795547 A CN202110795547 A CN 202110795547A CN 113405269 A CN113405269 A CN 113405269A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010257 thawing Methods 0.000 claims abstract description 88
- 239000003507 refrigerant Substances 0.000 claims abstract description 83
- 238000005057 refrigeration Methods 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004781 supercooling Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The present disclosure provides a refrigeration system and a control method thereof, the refrigeration system including: the system comprises a compressor, a condenser, a first throttling device, a first evaporator, a second evaporator, a heat regenerator, a first bypass pipeline and a second bypass pipeline, wherein the heat regenerator is arranged between the condenser and the first throttling device; one end of the first bypass pipeline is communicated with the exhaust end of the compressor, the other end of the first bypass pipeline can be communicated to the first evaporator and/or the second evaporator to perform heating defrosting, one end of the second bypass pipeline can be communicated to the first evaporator and/or the second evaporator, the other end of the second bypass pipeline can also be communicated to the air suction end of the compressor after heat exchange of the heat regenerator, and therefore the refrigerant after heating defrosting through the first evaporator and/or the second evaporator is guided into the heat regenerator to be heated and then returns to the compressor. According to the defrosting method and the defrosting device, hot gas bypass defrosting is realized, the cold energy of a frost layer is utilized, meanwhile, the compressor is prevented from being impacted by liquid, the refrigerating capacity is also improved, and the refrigerating efficiency is improved.
Description
Technical Field
The disclosure relates to the technical field of refrigeration, in particular to a refrigeration system and a control method thereof.
Background
In low-temperature refrigeration, such as refrigeration, when the relative humidity of air in a cold consumption environment is high and the evaporation temperature is far lower than zero degrees centigrade, the evaporator is very easy to frost, so that the refrigerating unit frequently enters a defrosting stage, and the fluctuation of the environmental temperature is influenced.
The common defrosting has two modes of reverse cycle defrosting and hot gas bypass defrosting, and the reverse cycle defrosting has long time and large temperature fluctuation; when the hot gas bypass is directly used for defrosting, the defrosting time is long, the defrosting effect is relatively poor, the defrosting is not clean, and in addition, the mode of hot gas bypass defrosting easily leads the air suction of the compressor to carry liquid
In the refrigerating unit in the prior art, the refrigerating unit can not provide cold energy in the defrosting process, so that the temperature fluctuation in a cold consumption environment is caused; in the hot gas bypass defrosting process, the cold energy of a frost layer is not utilized, and the liquid refrigerant defrosted by the evaporator easily enters the compressor to damage the compressor, so that the refrigeration system and the control method thereof are researched and designed in the disclosure.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Therefore, the technical problem to be solved by the present disclosure is to overcome the defects that in the prior art, in the hot gas bypass defrosting process, the refrigeration capacity of a frost layer is not utilized, and the liquid refrigerant defrosted by the evaporator easily enters the compressor to damage the compressor, so as to provide a refrigeration system and a control method thereof.
In order to solve the above problems, the present disclosure provides a refrigeration system, including:
the system comprises a compressor, a condenser, a first throttling device, a first evaporator, a second evaporator, a heat regenerator, a first bypass pipeline and a second bypass pipeline, wherein the heat regenerator is arranged between the condenser and the first throttling device; one end of the first bypass pipeline is communicated with the exhaust end of the compressor, the other end of the first bypass pipeline can be communicated to the first evaporator and/or the second evaporator to perform heating defrosting, one end of the second bypass pipeline can be communicated to the first evaporator and/or the second evaporator, the other end of the second bypass pipeline can also be communicated back to the air suction end of the compressor after heat exchange of the heat regenerator, and therefore the refrigerant subjected to heating defrosting by the first evaporator and/or the second evaporator is guided into the heat regenerator to be heated and then returns to the compressor.
In some embodiments, the compressor further comprises a third pipeline, a fourth pipeline and a fifth pipeline, the first evaporator is disposed on the third pipeline, the second evaporator is disposed on the fourth pipeline, the first throttling device is disposed on the fifth pipeline, the third pipeline and the fourth pipeline are disposed in parallel, one end of the third pipeline is communicated with one end of the fifth pipeline after parallel connection, and the other end of the third pipeline is communicated with the suction end of the compressor after being merged with the second bypass pipeline.
In some embodiments, a first valve is disposed on a section of the third line connected to the fifth line, and a third valve is disposed on a section of the third line connected to the second bypass line;
and a second valve is arranged on a pipe section connected with the fifth pipeline on the fourth pipeline, and a fourth valve is arranged on a pipe section connected with the second bypass pipeline on the fourth pipeline.
In some embodiments, the first valve is a one-way valve that only allows refrigerant to flow from the regenerator to the first evaporator; the second valve is also a one-way valve and only allows the refrigerant to flow from the heat regenerator to the second evaporator;
the third valve is an electromagnetic valve, and the fourth valve is also an electromagnetic valve.
In some embodiments, further comprising a sixth bypass line and a seventh bypass line,
one end of the sixth bypass pipeline is communicated with the other end of the first bypass pipeline, and the other end of the sixth bypass pipeline is communicated to the third pipeline and is positioned between the first valve and the first evaporator; a fifth valve is arranged on the sixth bypass pipeline;
one end of the seventh bypass pipeline is communicated with the other end of the first bypass pipeline, and the other end of the seventh bypass pipeline is communicated to the fourth pipeline and is positioned between the second valve and the second evaporator; and a sixth valve is arranged on the seventh bypass pipeline.
In some embodiments, the fifth valve and the sixth valve are both solenoid valves.
In some embodiments, further comprising an eighth bypass line and a ninth bypass line,
one end of the eighth bypass pipeline is communicated with the other end of the second bypass pipeline, the other end of the eighth bypass pipeline is communicated to the third pipeline and is positioned between the third valve and the first evaporator, and a seventh valve is arranged on the eighth bypass pipeline;
one end of the ninth bypass pipeline is communicated with the other end of the second bypass pipeline, the other end of the ninth bypass pipeline is communicated to the fourth pipeline and is positioned between the fourth valve and the second evaporator, and an eighth valve is arranged on the ninth bypass pipeline.
In some embodiments, the seventh valve and the eighth valve are both one-way valves.
In some embodiments, a second throttling device is further disposed on the second bypass pipeline at a position between the heat regenerator and the first evaporator or the second evaporator; the refrigeration system also comprises a first fan for exchanging heat with the first evaporator and a second fan for exchanging heat with the second evaporator.
The present disclosure also provides a method of controlling a refrigeration system according to any of the preceding claims, comprising: detecting the operation mode of a refrigeration system, and detecting the temperatures of the first evaporator and the second evaporator;
judging whether the first evaporator or the second evaporator needs to enter defrosting or not;
controlling the second evaporator to refrigerate and simultaneously controlling the exhaust gas of the compressor to enter the first evaporator to heat and defrost when the first evaporator needs defrosting, wherein the refrigerant coming out of the first evaporator enters the heat regenerator to absorb heat and returns to the air suction end of the compressor;
when the second evaporator needs to be defrosted, the first evaporator is controlled to refrigerate, meanwhile, the exhaust gas of the compressor is controlled to enter the second evaporator to heat and defrost, and the refrigerant coming out of the second evaporator enters the heat regenerator to absorb heat and returns to the air suction end of the compressor;
when the first evaporator and the second evaporator do not need defrosting, the first evaporator and the second evaporator are controlled to refrigerate.
In some embodiments, when a third valve, a fourth valve, a fifth valve, and a sixth valve are included:
when the first evaporator needs to enter defrosting, controlling the third valve to be closed, controlling the fourth valve to be opened, controlling the fifth valve to be opened, and controlling the sixth valve to be closed;
when the second evaporator needs to enter defrosting, controlling the third valve to be opened, controlling the fourth valve to be closed, controlling the fifth valve to be closed, and controlling the sixth valve to be opened;
when the first evaporator and the second evaporator do not need defrosting, the third valve is controlled to be opened, the fourth valve is controlled to be opened, the fifth valve is controlled to be closed, and the sixth valve is controlled to be closed.
In some embodiments, when the first fan and the second fan are included:
when the first evaporator is defrosted, controlling the first fan to stop; and when the second evaporator is defrosted, controlling the second fan to stop.
The refrigeration system and the control method thereof have the following beneficial effects:
the utility model discloses through setting up first bypass pipeline and second bypass pipeline, and make the second bypass pipeline return the suction end of compressor after the regenerator, the first bypass pipeline can introduce the exhaust of compressor and get into first evaporator or second evaporator and heat and defrost, and the refrigerant after defrosting gets into the regenerator through the second bypass pipeline and carries out the heat transfer with the refrigerant that the condenser came out, improve the super-cooled degree of the refrigerant that gets into first throttling arrangement, and improve the heat of the refrigerant in the second bypass pipeline, thereby effectively utilize the cold energy of frost layer to improve the super-cooled degree that gets into in second evaporator or first evaporator, improve the refrigerating output, and guarantee that the state that the refrigerant after defrosting gets into the compressor is gaseous, prevent that liquid refrigerant from getting into the compressor and destroying the compressor, realize the hot gas bypass defrosting, utilize the cold energy of frost layer to prevent compressor liquid hit still to improve the refrigerating output simultaneously, the refrigeration efficiency is improved.
Drawings
FIG. 1 is a system diagram of a refrigeration system of the present disclosure that is capable of continuous cryogenic operation;
fig. 2 is a refrigeration flow diagram of the dual-parallel evaporator of the present disclosure in a refrigeration operation;
fig. 3 is a refrigerant flow path diagram of defrosting of the first evaporator and refrigerating of the second evaporator according to the disclosure;
fig. 4 is a refrigerant flow path diagram of defrosting of the second evaporator and cooling of the first evaporator according to the disclosure;
fig. 5 is a defrosting control flow chart of the present disclosure.
The reference numerals are represented as:
1. a compressor; 2. a condenser; 3. a heat regenerator; 4. a first throttling device; 5. a first valve; 6. a second valve; 7. a first evaporator; 8. a second evaporator; 9. a third valve; 10. a fourth valve; 11. a gas-liquid separator; 12. a fifth valve; 13. a sixth valve; 14. a seventh valve; 15. an eighth valve; 18. a second throttling device;
101. a first bypass line; 102. a second bypass line; 103. a third pipeline; 104. a fourth pipeline; 105. a fifth pipeline; 106. a sixth bypass line; 107. a seventh bypass line; 108. an eighth bypass line; 109. a ninth bypass line.
Detailed Description
As shown in fig. 1-4, the present disclosure provides a refrigeration system comprising:
the system comprises a compressor 1, a condenser 2, a first throttling device 4, a first evaporator 7, a second evaporator 8, a heat regenerator 3, a first bypass pipeline 101 and a second bypass pipeline 102, wherein the heat regenerator 3 is arranged between the condenser 2 and the first throttling device 4; one end of the first bypass pipeline 101 is communicated with a discharge end of the compressor 1, and the other end of the first bypass pipeline can be communicated to the first evaporator 7 and/or the second evaporator 8 for heating and defrosting, one end of the second bypass pipeline 102 can be communicated to the first evaporator 7 and/or the second evaporator 8, and the other end of the second bypass pipeline 102 can also be communicated back to a suction end of the compressor 1 after heat exchange by the heat regenerator 3, so that a refrigerant subjected to heating and defrosting by the first evaporator 7 and/or the second evaporator 8 is guided into the heat regenerator 3 to be heated and returned to the compressor 1.
The utility model discloses through setting up first bypass pipeline and second bypass pipeline, and make the second bypass pipeline return the suction end of compressor after the regenerator, the first bypass pipeline can introduce the exhaust of compressor and get into first evaporator or second evaporator and heat and defrost, and the refrigerant after defrosting gets into the regenerator through the second bypass pipeline and carries out the heat transfer with the refrigerant that the condenser came out, improve the super-cooled degree of the refrigerant that gets into first throttling arrangement, and improve the heat of the refrigerant in the second bypass pipeline, thereby effectively utilize the cold energy of frost layer to improve the super-cooled degree that gets into in second evaporator or first evaporator, improve the refrigerating output, and guarantee that the state that the refrigerant after defrosting gets into the compressor is gaseous, prevent that liquid refrigerant from getting into the compressor and destroying the compressor, realize the hot gas bypass defrosting, utilize the cold energy of frost layer to prevent compressor liquid hit still to improve the refrigerating output simultaneously, the refrigeration efficiency is improved.
1. In the present disclosure, two sets of evaporators are connected in parallel at an outlet of a first throttling device 4 (preferably, an electronic expansion valve), the two evaporators can refrigerate simultaneously, and when one evaporator defrosts, the other evaporator continues to refrigerate, so as to form continuous cooling;
2. a heat regenerator 3 is arranged on the outlet of the condenser 2 and the hot gas bypass branch and used for utilizing the cold energy of the frost layer to achieve the effect of recovering the cold energy of the frost layer;
3. in the hot gas bypass branch, a second throttling device 18 (preferably a capillary tube) is arranged for maintaining the high and low pressure difference of the system when the hot gas bypasses defrosting.
4. Two paths of liquid are converged at the inlet of each evaporator, wherein one path is a main path from the first throttling device 4, a one-way valve is arranged, and the one-way valve is an optimal scheme but can be replaced by an electromagnetic valve; the other branch is a hot gas bypass air pipe branch led from an exhaust pipeline of the compressor, and an electromagnetic valve is arranged on the branch.
5. The outlet of each evaporator is divided into two paths, wherein one path is a main path and is provided with an electromagnetic valve; the other branch is a hot gas bypass liquid pipe branch, and a one-way valve, a capillary tube and a heat regenerator are arranged on the branch, wherein the one-way valve is the optimal scheme, but an electromagnetic valve can be adopted for replacing the one-way valve, and the capillary tube can also be replaced by a throttling mechanism such as an electronic expansion valve.
As shown in fig. 1, the refrigeration system is composed of a compressor 1, a condenser 2, a regenerator 3, a first throttling device 4 (preferably an electronic expansion valve), a first valve 5 (preferably a check valve), a second valve 6 (preferably a check valve), a first evaporator 7, a second evaporator 8, a third valve 9 (preferably a solenoid valve), a fourth valve 10 (preferably a solenoid valve), a gas-liquid separator 11, a fifth valve 12 (preferably a solenoid valve), a sixth valve 13 (preferably a solenoid valve), a seventh valve 14 (preferably a check valve), and an eighth valve 15 (preferably a check valve).
Different from a common refrigeration system, the evaporator disclosed by the disclosure is formed by connecting two sets of evaporators in parallel, and each set of evaporator is provided with an independent fan and a defrosting branch.
In some embodiments, the system further includes a third pipeline 103, a fourth pipeline 104 and a fifth pipeline 105, the first evaporator 7 is disposed on the third pipeline 103, the second evaporator 8 is disposed on the fourth pipeline 104, the first throttling device 4 is disposed on the fifth pipeline 105, the third pipeline 103 and the fourth pipeline 104 are disposed in parallel, one end of the third pipeline 103 is communicated with one end of the fifth pipeline 105, and the other end of the third pipeline is communicated with the suction end of the compressor 1 after being merged with the second bypass pipeline 102. The first pipeline is used for arranging the first evaporator, the fourth pipeline is used for arranging the second evaporator, and the fifth pipeline is provided with the first throttling device, so that one of the first evaporator and the second evaporator can still refrigerate when defrosting is needed, effective heating of the condenser is guaranteed, and the function of hot gas bypass defrosting is achieved.
In some embodiments, a first valve 5 is provided on the section of the third line 103 that is connected to the fifth line 105, and a third valve 9 is provided on the section of the third line 103 that is connected to the second bypass line 102;
a second valve 6 is arranged on the pipe section of the fourth pipeline 104 connected with the fifth pipeline 105, and a fourth valve 10 is arranged on the pipe section of the fourth pipeline 104 connected with the second bypass pipeline 102.
The first valve is arranged on the pipe section connected with the fifth pipeline on the third pipeline, so that the pipe section can be controlled to be communicated with or closed off from the first evaporator, the refrigerant introduced into the fifth pipeline can enter the first evaporator for refrigeration when the pipe section is communicated, and the high-temperature and high-pressure refrigerant introduced into the first evaporator for heating and defrosting when the pipe section is closed off can be controlled to enter the first evaporator for heating and defrosting through the first bypass pipeline; a third valve is arranged on a pipe section connected with the second bypass pipeline on the third pipeline, so that the pipe section can be controlled to be communicated with the first evaporator or closed, the refrigerant evaporated in the first evaporator can enter the compressor to suck air when the pipe section is communicated, and the refrigerant subjected to heating and defrosting of the first evaporator can be guided into the heat regenerator through the second bypass pipeline when the pipe section is closed; a second valve is arranged on a pipe section connected with the fifth pipeline on the fourth pipeline, so that the pipe section can be controlled to be communicated with or closed off from the second evaporator, a refrigerant introduced into the fifth pipeline can enter the second evaporator for refrigeration when the pipe section is communicated, and a high-temperature and high-pressure refrigerant can be introduced into the second evaporator for heating and defrosting when the pipe section is closed off; the fourth valve is arranged on the pipe section connected with the second bypass pipeline on the fourth pipeline, so that the pipe section can be controlled to be communicated with or closed off the second evaporator, the refrigerant evaporated in the second evaporator can enter the compressor to suck air when the pipe section is communicated with the second evaporator, and the refrigerant subjected to heating and defrosting of the second evaporator can be guided into the heat regenerator through the second bypass pipeline when the pipe section is closed.
In some embodiments, the first valve 5 is a one-way valve, which only allows the refrigerant to flow from the regenerator 3 to the first evaporator 7; the second valve 6 is also a one-way valve, and only allows the refrigerant to flow from the heat regenerator 3 to the second evaporator 8;
the third valve 9 is a solenoid valve and the fourth valve 10 is also a solenoid valve.
The first valve 5 is set as a one-way valve which only allows the refrigerant to flow from the first throttling device to the first evaporator, so that the refrigerant can be controlled to flow from the first throttling device to the first evaporator only, the refrigerant coming out of the first evaporator is prevented from returning to the first throttling device to cause backflow or the refrigerant passing through the first bypass pipeline is prevented from reaching the first throttling device or entering a fourth pipeline, and the heating defrosting effect cannot be formed on the first evaporator; similarly, by setting the second valve 6 as a check valve that allows only the refrigerant to flow from the first throttle device to the second evaporator, it is possible to control the refrigerant to flow only from the first throttle device to the second evaporator, and to prevent the refrigerant flowing from the second evaporator from returning to the first throttle device and causing backflow, or to prevent the refrigerant flowing from the first bypass line from reaching the first throttle device or entering the third line and failing to produce a heating defrost action for the second evaporator; the third valve and the fourth valve are arranged as solenoid valves which enable effective control of the pipe section.
In some embodiments, a sixth bypass line 106 and a seventh bypass line 107 are also included,
one end of the sixth bypass line 106 is communicated with the other end of the first bypass line 101, and the other end of the sixth bypass line 106 is communicated to the third line 103 and is located between the first valve 5 and the first evaporator 7; a fifth valve 12 is arranged on the sixth bypass pipeline 106;
one end of the seventh bypass line 107 communicates with the other end of the first bypass line 101, and the other end of the seventh bypass line 107 communicates with the fourth line 104 at a position between the second valve 6 and the second evaporator 8; a sixth valve 13 is provided in the seventh bypass line 107.
According to the high-temperature high-pressure refrigerant defrosting device, the high-temperature high-pressure refrigerant in the first bypass pipeline can be introduced into the first evaporator for heating and defrosting through the arrangement of the sixth bypass pipeline, and the fifth valve is used for effectively controlling the sixth bypass pipeline; the high-temperature and high-pressure refrigerant in the first bypass pipeline can be introduced into the second evaporator for heating and defrosting through the arrangement of the seventh bypass pipeline, and the sixth valve is used for effectively controlling the seventh bypass pipeline.
In some embodiments, the fifth valve 12 and the sixth valve 13 are both solenoid valves. The fifth valve and the sixth valve are provided as solenoid valves enabling effective control of the pipe section.
In some embodiments, an eighth bypass line 108 and a ninth bypass line 109 are also included,
one end of the eighth bypass line 108 is communicated with the other end of the second bypass line 102, the other end of the eighth bypass line 108 is communicated to the third line 103 and is located between the third valve 9 and the first evaporator 7, and a seventh valve 14 is arranged on the eighth bypass line 108;
one end of the ninth bypass line 109 is communicated with the other end of the second bypass line 102, the other end of the ninth bypass line 109 is communicated to the fourth line 104 and is located between the fourth valve 10 and the second evaporator 8, and an eighth valve 15 is arranged on the ninth bypass line 109.
According to the air conditioner, the eighth bypass pipeline is arranged, so that the refrigerant subjected to heating and defrosting by the first evaporator can be guided into the heat regenerator through the second bypass pipeline to exchange heat with the refrigerant in the heat regenerator from the condenser, the superheat degree of the refrigerant entering the air suction end of the compressor is improved, meanwhile, the supercooling degree of the refrigerant entering the first throttling device is improved by using frost layer cold energy, the refrigerating capacity of the evaporator in refrigerating and evaporating is improved, and the refrigerating efficiency is improved; the seventh valve is used for effectively controlling the eighth bypass pipeline; the refrigerant after being heated and defrosted by the second evaporator can be guided into the heat regenerator through the ninth bypass pipeline to exchange heat with the refrigerant in the heat regenerator from the condenser so as to improve the superheat degree of the refrigerant entering the air suction end of the compressor, and meanwhile, the supercooling degree of the refrigerant entering the first throttling device is improved by using the frost layer cold energy, so that the refrigerating capacity of the evaporator for refrigerating and evaporating is improved, and the refrigerating efficiency is improved; the eighth valve is used for effectively controlling the eighth bypass line.
In some embodiments, the seventh valve 14 and the eighth valve 15 are both check valves, the seventh valve only allows the refrigerant to flow from the first evaporator to the regenerator, and the eighth valve only allows the refrigerant to flow from the second evaporator to the regenerator. The third valve and the fourth valve are arranged as solenoid valves which enable effective control of the pipe section.
By setting the seventh valve 14 as a one-way valve that only allows the refrigerant flowing from the first evaporator to the heat regenerator, the refrigerant in the heat regenerator can be prevented from returning to the first evaporator or to the second evaporator, causing the refrigerant to flow back, or the refrigerant in the eighth bypass pipeline is prevented from entering the ninth bypass pipeline and entering the fourth pipeline, or the refrigerant in the eighth bypass pipeline is prevented from entering the eighth bypass pipeline and entering the third pipeline, so that the refrigerant subjected to heating and defrosting can not reach the heat regenerator and can not achieve the effect of improving the evaporation supercooling degree by using the frost layer cold; similarly, by setting the eighth valve 15 as a one-way valve that only allows the refrigerant flowing from the second evaporator to the heat regenerator, the refrigerant in the heat regenerator can be prevented from returning to the first evaporator or to the second evaporator, thereby causing the refrigerant to flow back, or the refrigerant in the eighth bypass pipeline can be prevented from entering the ninth bypass pipeline and entering the fourth pipeline, or the refrigerant in the ninth bypass pipeline can be prevented from entering the eighth bypass pipeline and entering the third pipeline, thereby preventing the refrigerant subjected to heating and defrosting from failing to reach the heat regenerator and failing to achieve the effect of improving the evaporation supercooling degree by using the frost layer cold.
In some embodiments, a second throttling device 18 is further disposed on the second bypass line 102 at a position between the regenerator 3 and the first evaporator 7 or the second evaporator 8; the refrigeration system further comprises a first fan for exchanging heat with the first evaporator 7 and a second fan for exchanging heat with the second evaporator 8. The refrigerant that heats and defrosts through the first evaporator or heats and defrosts through the second evaporator can also be throttled and depressurized through the second throttling device arranged on the second bypass pipeline, and then enters the heat regenerator for evaporation and refrigeration, so that the supercooling degree of the refrigerant at the outlet of the heat regenerator is improved.
As shown in fig. 5, the present disclosure also provides a control method of the refrigeration system according to any one of the preceding claims, which includes: a detection step of detecting an operation mode of the refrigeration system and detecting temperatures of the first evaporator 7 and the second evaporator 8;
a judging step of judging whether the first evaporator 7 or the second evaporator 8 needs to enter defrosting;
a control step, when the first evaporator 7 needs to enter defrosting, controlling the second evaporator 8 to refrigerate, controlling the exhaust gas of the compressor to enter the first evaporator 7 to heat and defrost, and enabling the refrigerant coming out of the first evaporator 7 to enter the heat regenerator 3 to absorb heat and return to the air suction end of the compressor;
when the second evaporator 8 needs to enter defrosting, the first evaporator 7 is controlled to refrigerate, meanwhile, the exhaust gas of the compressor is controlled to enter the second evaporator 8 to heat and defrost, and the refrigerant coming out of the second evaporator 8 enters the heat regenerator 3 to absorb heat and returns to the air suction end of the compressor;
when the first evaporator 7 and the second evaporator 8 do not need defrosting, controlling the first evaporator 7 and the second evaporator 8 to refrigerate.
The two sets of evaporators are adopted, so that the unit can continuously provide cold energy in the defrosting process; a heat regenerator and a second throttling device are added in the refrigerating system, so that the cold energy of a frost layer is fully utilized in the defrosting process to form cold energy recovery, and the refrigerating efficiency is improved; in addition, the situation of sucking air and carrying liquid in the defrosting process is avoided.
In some embodiments, when third valve 9, fourth valve 10, fifth valve 12 and sixth valve 13 are included,
when the first evaporator 7 needs to enter defrosting, the third valve 9 is controlled to be closed, the fourth valve 10 is controlled to be opened, the fifth valve 12 is controlled to be opened, and the sixth valve 13 is controlled to be closed;
when the second evaporator 8 needs to enter defrosting, the third valve 9 is controlled to be opened, the fourth valve 10 is controlled to be closed, the fifth valve 12 is controlled to be closed, and the sixth valve 13 is controlled to be opened;
when the first evaporator 7 and the second evaporator 8 do not need defrosting, the third valve 9 is controlled to be opened, the fourth valve 10 is controlled to be opened, the fifth valve 12 is controlled to be closed, and the sixth valve 13 is controlled to be closed.
In some embodiments, when the first evaporator 7 defrosts, a first fan controlling the first evaporator 7 is shut down; and when the second evaporator 8 is defrosted, controlling a second fan of the second evaporator 8 to stop. This disclosure shuts down through the fan of the evaporimeter that the control changes the frost, can prevent effectively that this evaporimeter is used for the heat of the refrigerant of changing the frost to be taken away rapidly by the air and influence the defrosting effect to improve the defrosting effect.
(1) Normal refrigeration operation of system-refrigeration operation of double parallel evaporators
Under normal conditions, the two sets of evaporators cool simultaneously, the third valve 9 (preferably solenoid valve) and the fourth valve 10 (preferably solenoid valve) are opened, the fifth valve 12 (preferably solenoid valve) and the sixth valve 13 (preferably solenoid valve) are closed, the fans of the first evaporator 7 and the second evaporator 8 are opened, and the refrigerant flows as shown in fig. 2. The exhaust gas of the compressor 1 enters a condenser 2 for condensation, and is divided into two branches after passing through a heat regenerator 3 and a first throttling device 4, wherein one branch enters a first evaporator 7 for refrigeration after passing through a first valve 5 (preferably a one-way valve), and a refrigerant enters a gas-liquid separator 11 after being gasified and absorbing heat through a third valve 9 (preferably an electromagnetic valve); the other branch enters a second evaporator 8 for refrigeration after passing through a second one-way valve, and a refrigerant is gasified and absorbs heat and then enters a gas-liquid separator 11 through a fourth valve 10 (preferably an electromagnetic valve); the gas mixed by the two branches in the gas-liquid separator enters the compressor 1 for compression, and the compression is performed circularly.
(2) The first evaporator 7 enters into defrosting, and the system control method
When one set of evaporator enters a defrosting stage, the other evaporator performs forced cooling operation (when the set of evaporator reaches a defrosting condition, the other set of evaporator also performs forced cooling operation until the other set of evaporator exits defrosting).
When the first evaporator 7 reaches the defrosting condition, the system control flow is as shown in fig. 5, the fifth valve 12 (preferably, a solenoid valve) and the fourth valve 10 (preferably, a solenoid valve) are opened, the sixth valve 13 (preferably, a solenoid valve) and the third valve 9 (preferably, a solenoid valve) are closed, the fan of the first evaporator 7 is stopped, and the first evaporator 7 enters the defrosting state. As shown in fig. 3, the refrigerant flows in two paths, wherein the high-temperature and high-pressure gas from the compressor 1 is divided into two paths, one path of the high-temperature and high-pressure gas passes through the fifth valve 12 (preferably an electromagnetic valve) and enters the first evaporator 7 for heat absorption and defrosting, the refrigerant which is changed into a liquid state enters the heat regenerator for heat exchange through the seventh valve 14 (preferably a one-way valve) and the second throttling device 18, and then enters the gas-liquid separator 11 after heat exchange, so that the function of hot gas bypass defrosting is achieved; when the first evaporator 7 is defrosted, the second evaporator 8 needs to be refrigerated, the other path of the air exhausted by the compressor 1 is condensed and cooled by the condenser 2 and the heat regenerator 3, then enters the second evaporator 8 through the first throttling device 4 and the second valve 6 (preferably a one-way valve) to provide cold energy, finally enters the gas-liquid separator 11 through the fourth valve 10 (preferably an electromagnetic valve), and then enters the compressor 1 to be compressed; when the first evaporator 7 reaches the defrosting exit condition, the fifth valve 12 (preferably a solenoid valve) and the sixth valve 13 (preferably a solenoid valve) are closed, the third valve 9 (preferably a solenoid valve) and the fourth valve 10 (preferably a solenoid valve) are opened, and the double-evaporator refrigeration operation is carried out.
(3) The second evaporator 8 enters into defrosting, and the system control method
When the second evaporator 8 reaches the defrosting condition, the system control flow is as shown in fig. 5, the sixth valve 13 (preferably an electromagnetic valve) and the third valve 9 (preferably an electromagnetic valve) are opened, the fifth valve 12 (preferably an electromagnetic valve) and the fourth valve 10 (preferably an electromagnetic valve) are closed, the fan of the second evaporator 8 is stopped at the same time, and the second evaporator 8 enters the defrosting state. As shown in fig. 4, the high-temperature and high-pressure exhaust gas of the compressor 1 is divided into two paths, one path of the exhaust gas passes through the sixth valve 13 (preferably an electromagnetic valve) and enters the second evaporator 8 to absorb heat and defrost, the refrigerant which is changed into a liquid state passes through the eighth valve 15 (preferably a one-way valve) and the second throttling device 18 and enters the heat regenerator to exchange heat, and the refrigerant enters the gas-liquid separator 11 after exchanging heat, so that the function of hot gas bypass defrosting is achieved; when the second evaporator 8 is defrosted, the first evaporator 7 needs to be refrigerated, the other path of the air exhausted by the compressor 1 is condensed and cooled by the condenser 2 and the heat regenerator 3, then enters the first evaporator 7 through the first throttling device 4 and the first valve 5 (preferably a one-way valve) to provide cold energy, finally enters the gas-liquid separator 11 through the third valve 9 (preferably an electromagnetic valve), and then enters the compressor 1 to be compressed; when the second evaporator 8 reaches the defrosting exit condition, the fifth valve 12 (preferably a solenoid valve) and the sixth valve 13 (preferably a solenoid valve) are closed, the third valve 9 (preferably a solenoid valve) and the fourth valve 10 (preferably a solenoid valve) are opened, and the double-evaporator refrigeration operation is carried out.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.
Claims (12)
1. A refrigeration system, characterized by: the method comprises the following steps:
the system comprises a compressor (1), a condenser (2), a first throttling device (4), a first evaporator (7) and a second evaporator (8), and further comprises a heat regenerator (3), a first bypass pipeline (101) and a second bypass pipeline (102), wherein the heat regenerator (3) is arranged between the condenser (2) and the first throttling device (4); one end of the first bypass pipeline (101) is communicated with a gas exhaust end of the compressor (1), the other end of the first bypass pipeline can be communicated to the first evaporator (7) and/or the second evaporator (8) for heating and defrosting, one end of the second bypass pipeline (102) can be communicated to the first evaporator (7) and/or the second evaporator (8), the other end of the second bypass pipeline (102) can also be communicated back to a gas suction end of the compressor (1) after heat exchange of the heat regenerator (3), so that refrigerant after heating and defrosting of the first evaporator (7) and/or the second evaporator (8) is guided into the heat regenerator (3) to be heated and then returns to the compressor (1).
2. The refrigeration system of claim 1, wherein:
the compressor is characterized by further comprising a third pipeline (103), a fourth pipeline (104) and a fifth pipeline (105), the first evaporator (7) is arranged on the third pipeline (103), the second evaporator (8) is arranged on the fourth pipeline (104), the first throttling device (4) is arranged on the fifth pipeline (105), the third pipeline (103) and the fourth pipeline (104) are arranged in parallel, one end of the third pipeline after parallel connection is communicated with one end of the fifth pipeline (105), and the other end of the third pipeline after parallel connection is communicated with the air suction end of the compressor (1) after being converged by the second bypass pipeline (102).
3. The refrigeration system of claim 2, wherein:
a first valve (5) is arranged on a pipe section of the third pipeline (103) connected with the fifth pipeline (105), and a third valve (9) is arranged on a pipe section of the third pipeline (103) connected with the second bypass pipeline (102);
a second valve (6) is arranged on a pipe section of the fourth pipeline (104) connected with the fifth pipeline (105), and a fourth valve (10) is arranged on a pipe section of the fourth pipeline (104) connected with the second bypass pipeline (102).
4. The refrigeration system of claim 3, wherein:
the first valve (5) is a one-way valve and only allows refrigerant to flow from the heat regenerator (3) to the first evaporator (7); the second valve (6) is also a one-way valve and only allows refrigerant to flow from the heat regenerator (3) to the second evaporator (8);
the third valve (9) is an electromagnetic valve, and the fourth valve (10) is also an electromagnetic valve.
5. The refrigeration system of claim 3, wherein:
also comprises a sixth bypass pipeline (106) and a seventh bypass pipeline (107),
one end of the sixth bypass pipeline (106) is communicated with the other end of the first bypass pipeline (101), and the other end of the sixth bypass pipeline (106) is communicated to the third pipeline (103) and is positioned between the first valve (5) and the first evaporator (7); a fifth valve (12) is arranged on the sixth bypass pipeline (106);
one end of the seventh bypass pipeline (107) is communicated with the other end of the first bypass pipeline (101), and the other end of the seventh bypass pipeline (107) is communicated to the fourth pipeline (104) and is positioned between the second valve (6) and the second evaporator (8); and a sixth valve (13) is arranged on the seventh bypass pipeline (107).
6. The refrigeration system of claim 5, wherein:
the fifth valve (12) and the sixth valve (13) are both solenoid valves.
7. The refrigeration system according to any one of claims 3 to 6, wherein:
further comprises an eighth bypass pipeline (108) and a ninth bypass pipeline (109),
one end of the eighth bypass pipeline (108) is communicated with the other end of the second bypass pipeline (102), the other end of the eighth bypass pipeline (108) is communicated to the third pipeline (103) and is positioned between the third valve (9) and the first evaporator (7), and a seventh valve (14) is arranged on the eighth bypass pipeline (108);
one end of the ninth bypass pipeline (109) is communicated with the other end of the second bypass pipeline (102), the other end of the ninth bypass pipeline (109) is communicated to the fourth pipeline (104) and is located between the fourth valve (10) and the second evaporator (8), and an eighth valve (15) is arranged on the ninth bypass pipeline (109).
8. The refrigeration system of claim 7, wherein:
the seventh valve (14) and the eighth valve (15) are both one-way valves.
9. The refrigeration system according to any one of claims 1 to 8, wherein:
a second throttling device (18) is further arranged on the second bypass pipeline (102) and between the heat regenerator (3) and the first evaporator (7) or the second evaporator (8); the refrigeration system also comprises a first fan for exchanging heat with the first evaporator (7) and a second fan for exchanging heat with the second evaporator (8).
10. A control method of a refrigeration system according to any one of claims 1 to 9, characterized in that: the method comprises the following steps: a detection step, detecting the operation mode of the refrigeration system, and detecting the temperature of the first evaporator (7) and the second evaporator (8);
a judging step of judging whether the first evaporator (7) or the second evaporator (8) needs to enter defrosting or not;
controlling the second evaporator (8) to refrigerate and simultaneously controlling the exhaust gas of the compressor to enter the first evaporator (7) to heat and defrost when the first evaporator (7) needs to enter defrosting, wherein the refrigerant coming out of the first evaporator (7) enters the heat regenerator (3) to absorb heat and returns to the air suction end of the compressor;
when the second evaporator (8) needs to enter defrosting, the first evaporator (7) is controlled to refrigerate, meanwhile, the exhaust gas of the compressor is controlled to enter the second evaporator (8) to heat and defrost, and the refrigerant coming out of the second evaporator (8) enters the heat regenerator (3) to absorb heat and returns to the air suction end of the compressor;
when the first evaporator (7) and the second evaporator (8) do not need defrosting, controlling the first evaporator (7) and the second evaporator (8) to refrigerate.
11. The control method according to claim 10, characterized in that:
when a third valve (9), a fourth valve (10), a fifth valve (12) and a sixth valve (13) are included:
when the first evaporator (7) needs to enter defrosting, controlling the third valve (9) to be closed, controlling the fourth valve (10) to be opened, controlling the fifth valve (12) to be opened, and controlling the sixth valve (13) to be closed;
when the second evaporator (8) needs to enter defrosting, controlling the third valve (9) to be opened, controlling the fourth valve (10) to be closed, controlling the fifth valve (12) to be closed, and controlling the sixth valve (13) to be opened;
when the first evaporator (7) and the second evaporator (8) do not need defrosting, the third valve (9) is controlled to be opened, the fourth valve (10) is controlled to be opened, the fifth valve (12) is controlled to be closed, and the sixth valve (13) is controlled to be closed.
12. The control method according to claim 10 or 11, characterized in that:
when including first fan and second fan:
when the first evaporator (7) is defrosted, controlling the first fan to stop; and when the second evaporator (8) is defrosted, controlling the second fan to stop.
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