CN113494790A - Refrigeration system, defrosting control method and refrigeration equipment thereof - Google Patents
Refrigeration system, defrosting control method and refrigeration equipment thereof Download PDFInfo
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- CN113494790A CN113494790A CN202110856232.7A CN202110856232A CN113494790A CN 113494790 A CN113494790 A CN 113494790A CN 202110856232 A CN202110856232 A CN 202110856232A CN 113494790 A CN113494790 A CN 113494790A
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- defrosting
- indoor heat
- heat exchanger
- liquid
- heat exchangers
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- 238000010257 thawing Methods 0.000 title claims abstract description 207
- 238000005057 refrigeration Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 146
- 239000003507 refrigerant Substances 0.000 claims abstract description 83
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 230000005494 condensation Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 description 18
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Classifications
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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
- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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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- 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
Abstract
The invention provides a refrigeration system, a defrosting control method and refrigeration equipment thereof, relates to the technical field of refrigeration, and solves the technical problem that a heat exchanger in the prior art is low in defrosting efficiency. The refrigerating system comprises a compressor, an outdoor heat exchanger, a liquid storage device and at least two indoor heat exchangers, wherein an exhaust port of the compressor can be communicated with the indoor heat exchanger to be defrosted or can be communicated with a condenser and the indoor heat exchanger to be defrosted simultaneously in a defrosting mode, the indoor heat exchanger and the outdoor heat exchanger are communicated with the liquid storage device, a gas-liquid mixture generated after the indoor heat exchanger is defrosted can flow into the liquid storage device to be mixed with refrigerant liquid flowing into the liquid storage device from the condenser, and the mixed refrigerant liquid in the liquid storage device can flow into the indoor heat exchanger in a refrigerating mode to be evaporated. The invention reasonably utilizes the high-temperature and high-pressure refrigerant liquid after defrosting, and improves the defrosting efficiency.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system, a defrosting control method and refrigeration equipment thereof.
Background
The existing evaporator mainly adopts an electric heating mode, a four-way valve or a hot gas bypass mode to defrost.
When the electric heating defrosting is adopted, the defrosting time is long, and the defrosting temperature rise is large; when the defrosting mode of the four-way valve is adopted, liquid impact is easy to occur on the four-way valve, and when a plurality of evaporators defrost simultaneously, the four-way valve flows through the evaporator, the flow control is poor, and the four-way valve is blocked easily.
The hot gas bypass defrosting mode directly discharges high-temperature and high-pressure refrigerant steam discharged by the compressor into the air cooler through the electric three-way valve to melt a frost layer on the fins, defrosting time is short, influence on storage temperature is small, and the flow direction of high-temperature and high-pressure refrigerant liquid after defrosting is difficult to process.
Disclosure of Invention
The invention aims to provide a refrigerating system, a defrosting control method and refrigerating equipment thereof, and solves the technical problem that a heat exchanger in the prior art is low in defrosting efficiency. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a refrigeration system, which comprises a compressor, an outdoor heat exchanger, a liquid storage device and at least two indoor heat exchangers, wherein: in the defrosting mode, an exhaust port of the compressor can be communicated with an indoor heat exchanger to be defrosted or can be simultaneously communicated with the outdoor heat exchanger and the indoor heat exchanger to be defrosted, the indoor heat exchanger and the outdoor heat exchanger are both communicated with the liquid accumulator, a gas-liquid mixture generated after defrosting through the indoor heat exchanger can flow into the liquid accumulator to be mixed with refrigerant liquid flowing into the liquid accumulator through the outdoor heat exchanger, and the refrigerant liquid mixed in the liquid accumulator can flow into the indoor heat exchanger in the refrigerating mode to be evaporated.
As a further improvement of the present invention, the exhaust port of the compressor is communicated with the outdoor heat exchanger and/or at least one of the indoor heat exchangers through a first reversing device.
As a further improvement of the present invention, a corresponding refrigerant pipeline is arranged between each indoor heat exchanger and each outdoor heat exchanger, an electronic expansion valve is arranged on each refrigerant pipeline, refrigerant condensed by the outdoor heat exchanger enters the liquid reservoir and then flows through a liquid separator, and after liquid separation by the liquid separator, the refrigerant flows into the indoor heat exchanger through the adjustment of the electronic expansion valve of the corresponding branch.
As a further improvement of the present invention, a defrosting pipeline is arranged between each indoor heat exchanger and the first reversing device, a second reversing device is arranged on each defrosting pipeline, at least a portion of gas discharged by the compressor can flow into the corresponding indoor heat exchanger through the first reversing device and the second reversing device to be defrosted, and a gas-liquid mixture generated after defrosting flows into the reservoir.
As a further improvement of the invention, the first reversing device and the second reversing device are both three-way reversing valves.
A defrosting control method related to the refrigeration system comprises the following steps:
step S1: receiving a defrosting instruction;
step S2: controlling the sequence of the indoor heat exchangers entering a defrosting mode according to a defrosting control scheme;
step S3: and controlling the exhaust port of the compressor to be communicated with the evaporator entering the defrosting mode, or controlling the exhaust port of the compressor to be communicated with the condenser and the evaporator entering the defrosting mode simultaneously.
As a further improvement of the present invention, in step S3, when the amount of the refrigerant liquid in the accumulator cannot meet the requirement of the cooling mode, the discharge port of the compressor is controlled to simultaneously communicate the condenser and the evaporator entering the defrosting mode;
and when the quantity of the refrigerant liquid in the liquid storage device can meet the requirement of a refrigeration mode, controlling the exhaust port of the compressor to be communicated with the evaporator entering a defrosting mode.
As a further improvement of the present invention, when the number of the indoor heat exchangers meeting the defrosting condition is n and the total number of the indoor heat exchangers is not more than 2n, the exhaust port of the compressor is controlled to communicate with the indoor heat exchangers entering the defrosting mode, gas discharged from the compressor enters the indoor heat exchangers meeting the defrosting condition through the first reversing device for defrosting, a gas-liquid mixture generated after defrosting flows into the liquid reservoir and is mixed with liquid flowing into the liquid reservoir from the outdoor heat exchanger, mixed refrigerant liquid flowing out of the liquid reservoir flows into the indoor heat exchangers in the refrigeration mode for evaporation after liquid separation, and evaporated low-temperature and low-pressure gas flows into the compressor after separation through the gas-liquid separator to form the refrigeration cycle system.
As a further improvement of the present invention, when the number of the indoor heat exchangers satisfying the defrosting condition is n and the number of the indoor heat exchangers is not less than 2n +1, controlling an exhaust port of the compressor to simultaneously communicate the condenser and the indoor heat exchanger entering a defrosting mode, part of gas discharged by the compressor flows to the outdoor heat exchanger for condensation, the rest part of gas enters the indoor heat exchanger meeting the defrosting condition through the first reversing device for defrosting, a gas-liquid mixture generated after defrosting flows to the liquid reservoir, the refrigerant liquid is mixed with the liquid flowing into the liquid storage device from the outdoor heat exchanger, the mixed refrigerant liquid flowing out of the liquid storage device can flow into the indoor heat exchanger in a refrigeration mode to be evaporated after liquid separation, and the evaporated low-temperature low-pressure gas flows into a compressor after being separated by a vapor-liquid separator to form a refrigeration cycle system.
As a further improvement of the present invention, the heat exchange areas of all the indoor heat exchangers in the refrigeration system are equal.
As a further improvement of the present invention, when the number n of the indoor heat exchangers satisfying the defrosting condition is 2, one of the indoor heat exchangers satisfying the defrosting condition enters a defrosting mode, and after the defrosting of one of the indoor heat exchangers is completed, the other indoor heat exchanger satisfying the defrosting condition is allowed to enter the defrosting mode;
when the number n of the indoor heat exchangers meeting the defrosting condition is larger than or equal to 3, allowing two of the indoor heat exchangers meeting the defrosting condition to simultaneously enter a defrosting mode, and allowing the next indoor heat exchanger meeting the defrosting condition to enter the defrosting mode after one of the indoor heat exchangers finishes defrosting.
As a further improvement of the present invention, when two indoor heat exchangers enter into a defrosting mode at the same time, and when it is detected that the defrosting temperature of one of the indoor heat exchangers is lower than that of the other indoor heat exchanger, the flow rate flowing to the branch where the indoor heat exchanger with the lower defrosting temperature is located is increased until the defrosting temperatures of the two indoor heat exchangers are equal.
The refrigeration equipment comprises the defrosting control method.
As a further improvement of the invention, the refrigeration equipment is a refrigeration house, a freezer or an air conditioner.
The refrigeration system provided by the invention is characterized in that a high-temperature and high-pressure refrigerant gas-liquid mixture generated after defrosting of the system is introduced into a liquid storage device arranged in the system and is mixed with high-temperature and high-pressure refrigerant liquid condensed by an outdoor heat exchanger in the liquid storage device, so that the refrigerant gas which is not completely condensed is completely condensed, the condensed refrigerant liquid is subjected to liquid separation by a liquid separation head, and the high-temperature and high-pressure refrigerant liquid is redistributed and flows into an indoor heat exchanger in a refrigeration mode to be evaporated, thereby forming a refrigeration cycle. The refrigeration system utilizes the plurality of evaporators to alternately defrost, wherein the defrosting of one evaporator temperature area does not affect the normal operation of other temperature areas, and the defrosting is carried out through the hot gas bypass, so that the defrosting time is short, and the defrosting efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention.
Reference numerals: 1. a compressor; 2. a condenser; 3. a reservoir; 4. a vapor-liquid separator; 5. a first evaporator; 6. a second evaporator; 7. a third evaporator; 8. a fourth evaporator; 9. a liquid separation head; 10. a first refrigerant pipeline; 11. a second refrigerant pipeline; 12. a third refrigerant pipeline; 13. a fourth refrigerant pipeline; 14. a first electronic expansion valve; 15. a second electronic expansion valve; 16. a third electronic expansion valve; 17. a fourth electronic expansion valve; 18. a first three-way directional valve; 19. a second three-way directional valve; 20. a third three-way reversing valve; 21. a fourth three-way reversing valve; 22. a fifth three-way reversing valve; 23. a first check valve; 24. a second one-way valve; 25. a third check valve; 26. a fourth check valve; 27. and a fifth check valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, the present invention provides a refrigeration system, including a compressor 1, an outdoor heat exchanger (condenser 2), a reservoir 3, and at least two indoor heat exchangers (evaporators), wherein in a defrosting mode, an exhaust port of the compressor 1 can be communicated with the indoor heat exchanger to be defrosted or can be communicated with both the condenser 2 and the indoor heat exchanger to be defrosted, both the indoor heat exchanger and the outdoor heat exchanger are communicated with the reservoir 3, and a high-temperature and high-pressure gas-liquid mixture generated after defrosting by the indoor heat exchanger can flow into the reservoir 3 to be mixed with a high-temperature and high-pressure refrigerant liquid flowing into the reservoir 3 from the condenser 2, and the refrigerant liquid mixed in the reservoir 3 can flow into the indoor heat exchanger in the refrigeration mode to be evaporated.
The multiple evaporators are used for alternately defrosting, a high-temperature and high-pressure refrigerant gas-liquid mixture generated after the system is defrosted is guided into a liquid storage device 3 arranged in the system, the high-temperature and high-pressure refrigerant gas-liquid mixture is mixed with high-temperature and high-pressure refrigerant liquid condensed by an outdoor heat exchanger in the liquid storage device 3, the refrigerant gas which is not completely condensed is completely condensed, the condensed refrigerant liquid is subjected to liquid separation by a liquid separation head 9, the high-temperature and high-pressure refrigerant liquid is redistributed and flows into an indoor heat exchanger in a refrigeration mode to be evaporated, and a refrigeration cycle is formed. The problem of the refrigerant liquid flow direction of high temperature high pressure after having solved the frost among the prior art is difficult to handle is solved, the efficiency of defrosting has been improved.
Specifically, the exhaust port of the compressor 1 is communicated with the outdoor heat exchanger and/or at least one indoor heat exchanger through a first reversing device. A corresponding refrigerant pipeline is arranged between each indoor heat exchanger and each outdoor heat exchanger, an electronic expansion valve is arranged on each refrigerant pipeline, refrigerant which is condensed into high-temperature and high-pressure refrigerant by the outdoor heat exchangers flows through a liquid distributor after entering a liquid storage device 3, and the refrigerant flows into the indoor heat exchangers through the adjustment of the electronic expansion valves corresponding to the branches after being subjected to liquid separation by the liquid distributor. A defrosting pipeline is arranged between each indoor heat exchanger and the first reversing device, a second reversing device is arranged on each defrosting pipeline, at least part of high-temperature and high-pressure gas discharged by the compressor 1 can flow into the corresponding indoor heat exchanger through the first reversing device and the second reversing device to be defrosted, and a high-temperature and high-pressure gas-liquid mixture generated after defrosting flows into the liquid storage device 3.
As an optional implementation manner of the embodiment of the present invention, the first reversing device and the second reversing device are both three-way reversing valves. The first reversing device adopts a three-way reversing valve, high-temperature and high-pressure refrigerant steam discharged by the compressor 1 is bypassed by the three-way reversing valve, and the problems of gas leakage and liquid impact caused by too small flow and too large flow when a plurality of indoor heat exchangers are reversed by utilizing the four-way valve are avoided.
The invention also provides a defrosting control method adopting the refrigerating system, which comprises the following steps:
step S1: receiving a defrosting instruction;
step S2: controlling the sequence of the indoor heat exchangers entering a defrosting mode according to a defrosting control scheme;
step S3: and controlling the exhaust port of the compressor 1 to be communicated with the evaporator entering the defrosting mode, or controlling the exhaust port of the compressor 1 to be communicated with the condenser 2 and the evaporator entering the defrosting mode simultaneously.
In the above step S3, when the amount of the high-temperature and high-pressure refrigerant liquid in the accumulator 3 cannot satisfy the requirement of the cooling mode, the discharge port of the compressor 1 is controlled to simultaneously communicate the condenser 2 and the evaporator entering the defrosting mode; when the amount of the high-temperature and high-pressure refrigerant liquid in the accumulator 3 can satisfy the demand of the cooling mode, the exhaust port of the compressor 1 is controlled to communicate with the evaporator entering the defrosting mode.
Considering that the amount of refrigerant liquid in the accumulator 3 is not easy to see intuitively, in case that the heat exchange areas of all indoor heat exchangers in the refrigeration system are equal, when the number of indoor heat exchangers satisfying the defrosting condition is n and the total number of indoor heat exchangers is not more than 2n, an exhaust port of the compressor 1 is controlled to be communicated with the indoor heat exchanger entering a defrosting mode, high-temperature and high-pressure gas exhausted by the compressor 1 enters the indoor heat exchanger meeting defrosting conditions after passing through the first reversing device to be defrosted, a high-temperature and high-pressure gas-liquid mixture generated after defrosting flows into the liquid storage device 3, the refrigerant liquid is mixed with the high-temperature and high-pressure liquid flowing into the liquid storage device 3 from the outdoor heat exchanger, the mixed refrigerant liquid flowing out of the liquid storage device 3 can flow into the indoor heat exchanger in the refrigeration mode for evaporation after liquid separation, and the evaporated low-temperature and low-pressure gas flows into the compressor 1 after being separated by the vapor-liquid separator 4 to form a refrigeration cycle system.
When the number of the indoor heat exchangers meeting the defrosting condition is n and the number of the indoor heat exchangers is not less than 2n +1, an exhaust port of the compressor 1 is controlled to be communicated with the condenser 2 and the indoor heat exchangers entering the defrosting mode simultaneously, part of high-temperature high-pressure gas discharged by the compressor 1 flows to the outdoor heat exchangers for condensation, the rest of high-temperature high-pressure gas enters the indoor heat exchangers meeting the defrosting condition through the first reversing device for defrosting, a high-temperature high-pressure gas-liquid mixture generated after defrosting flows into the liquid reservoir 3 and is mixed with high-temperature high-pressure liquid flowing into the liquid reservoir 3 from the outdoor heat exchangers, the mixed refrigerant liquid flowing out of the liquid reservoir 3 can flow into the indoor heat exchangers in the refrigerating mode for evaporation after liquid separation, and the evaporated low-temperature low-pressure gas flows into the compressor 1 after separation through the gas-liquid separator 4 to form a refrigerating circulation system.
When the number n of the indoor heat exchangers meeting the defrosting conditions is 2, one of the indoor heat exchangers meeting the defrosting conditions enters a defrosting mode, and after one of the indoor heat exchangers finishes defrosting, the other indoor heat exchanger meeting the defrosting conditions is allowed to enter the defrosting mode; when the number n of the indoor heat exchangers meeting the defrosting condition is larger than or equal to 3, allowing two of the indoor heat exchangers meeting the defrosting condition to enter a defrosting mode at the same time, and allowing the next indoor heat exchanger meeting the defrosting condition to enter the defrosting mode after one of the indoor heat exchangers finishes defrosting.
And for the condition that the two indoor heat exchangers simultaneously enter the defrosting mode, when the defrosting temperature of one indoor heat exchanger is detected to be lower than that of the other indoor heat exchanger, the flow rate of the branch where the indoor heat exchanger with the lower defrosting temperature is located is increased until the defrosting temperatures of the two indoor heat exchangers are equal.
The defrosting control method according to the present invention will be described in detail with reference to the specific embodiment of fig. 1.
As shown in fig. 1, the refrigeration system of the present invention includes a compressor 1, a condenser 2 (outdoor heat exchanger), a liquid reservoir 3, a vapor-liquid separator 4, and four evaporators (indoor heat exchangers), an exhaust port of the compressor 1 is connected to the condenser 2 through a first three-way reversing valve 18, the condenser 2 is communicated with the liquid reservoir 3, refrigerant liquid in the liquid reservoir 3 flows through a liquid dividing head 9, liquid is uniformly divided by the liquid dividing head 9, the liquid dividing head 9 is connected to refrigerant pipelines of each branch, corresponding to a first refrigerant pipeline 10, a second refrigerant pipeline 11, a third refrigerant pipeline 12, and a fourth refrigerant pipeline 13 in fig. 1, the first refrigerant pipeline 10, the second refrigerant pipeline 11, the third refrigerant pipeline 12, and the fourth refrigerant pipeline 13 are respectively provided with a first electronic expansion valve 14, a second electronic expansion valve 15, a third electronic expansion valve 16, and a fourth electronic expansion valve 17, the end part far away from the liquid separation head 9 on the first refrigerant pipeline 10 is connected with a first evaporator 5, the end part far away from the liquid separation head 9 on the second refrigerant pipeline 11 is connected with a second evaporator 6, the end part far away from the liquid separation head 9 on the third refrigerant pipeline 12 is connected with a third evaporator 7, the end part far away from the liquid separation head 9 on the fourth refrigerant pipeline 13 is connected with a fourth evaporator 8, a fourth defrosting pipeline between the fourth evaporator 8 and the first three-way reversing valve 18 is provided with a second three-way reversing valve 19, a third defrosting pipeline between the third evaporator 7 and the first three-way reversing valve 18 is provided with a third three-way reversing valve 20, a second defrosting pipeline between the second evaporator 6 and the first three-way reversing valve 18 is provided with a fourth three-way reversing valve 21, and a fifth three-way reversing valve 22 is arranged on the first defrosting pipeline between the first evaporator 5 and the first three-way reversing valve 18. That is, the first three-way reversing valve 18 in fig. 1 is the aforementioned first reversing device, and the second three-way reversing valve 19, the third three-way reversing valve 20, the fourth three-way reversing valve 21, and the fifth three-way reversing valve 22 are the aforementioned second reversing device.
During normal refrigeration operation, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 flows to the condenser 2, and the first three-way selector valve 18 is switched to close the downward branch. The refrigerant is condensed into high-temperature and high-pressure refrigerant by the condenser 2, enters the liquid storage device 3 and flows through the liquid separation head 9, and it needs to be noted that the liquid storage device 3 can adjust and stabilize the circulation volume of the refrigerant during refrigeration; refrigerant liquid is uniformly divided by the liquid dividing head 9, and flows into the evaporators of the corresponding branches to be evaporated under the regulation of the electronic expansion valves of the branches, and the electronic expansion valves need to set different initial steps according to the common evaporation temperature of different evaporators, so that each evaporation interval can quickly reach the corresponding evaporation temperature; the low-temperature and low-pressure gas obtained by each evaporator is collected after being evaporated by the evaporator and then passing through the check valves (the first check valve 23, the second check valve 24, the third check valve 25 and the fourth check valve 26) of each branch, the check valves are used for preventing backflow phenomenon caused when the evaporation pressures of a plurality of evaporators are different, and low-temperature and low-pressure gas-liquid mixture can be separated from liquid drops carried in refrigerant gas through the gas-liquid separator 4 and finally flows into the compressor 1 to form a refrigeration cycle system.
In the defrosting operation process, when one evaporator meets the defrosting condition, the first three-way reversing valve 18 is switched, a right branch and a downward branch are opened, high-temperature and high-pressure refrigerant gas discharged by the compressor 1 passes through the first three-way reversing valve 18, one part of the high-temperature and high-pressure refrigerant gas flows to the condenser 2 for condensation, the other part of the high-temperature and high-pressure refrigerant gas passes through the first three-way reversing valve 18, flows downwards through the fifth three-way reversing valve 22 and then enters the first evaporator 5 for defrosting, at the moment, the first electronic expansion valve 14 is closed to 0B, the high-temperature and high-pressure refrigerant gas-liquid mixture generated after systematic defrosting is guided into the liquid storage device 3 arranged in the system through the fifth one-way valve 27 and mixed with the high-pressure refrigerant liquid reserved by the condenser 2, the refrigerant gas which is not completely condensed is completely condensed, the mixed refrigerant liquid in the liquid storage device 3 flows through the liquid distributing head 9, and the refrigerant liquid is uniformly distributed through the liquid distributing head 9, the low-temperature low-pressure gas evaporated by the third evaporator 7 flows to the vapor-liquid separator 4 through the third one-way valve 25, the low-temperature low-pressure gas evaporated by the fourth evaporator 8 flows to the vapor-liquid separator 4 through the fourth one-way valve 26, and the low-temperature low-pressure gas of each evaporator is collected, the liquid droplets carried in the separated refrigerant gas by the vapor-liquid separator 4 finally flow into the compressor 1 to constitute a refrigeration cycle. When the defrosting temperature of the first evaporator 5 is detected to be low, the flow of the first three-way reversing valve 18 to the lower branch is switched to be increased in proportion, and after the defrosting of the first evaporator 5 is finished, the first electronic expansion valve 14 is directly opened to the initial step number from 0B, so that the space temperature corresponding to the first evaporator 5 can quickly reach the set value.
When two evaporators simultaneously meet defrosting entering conditions, allowing the two evaporators to enter a defrosting state; for example, when the first evaporator 5 and the second evaporator 6 meet the defrosting condition, the first three-way reversing valve 18 is switched to open only the downward branch, a part of the high-temperature and high-pressure gas discharged by the compressor 1 flows to the second evaporator 6 through the fourth three-way reversing valve 21 to be defrosted, a part of the high-temperature and high-pressure gas flows to the first evaporator 5 through the fifth three-way reversing valve 22, the fourth three-way reversing valve 21 is switched to open the flow of the right branch, and the fifth three-way reversing valve 22 is switched to open half of the flow of the right branch; when the defrosting temperature of the first evaporator 5 is detected to be lower than that of the second evaporator 6, the flow of the right branch of the fifth three-way reversing valve 22 is switched to increase in proportion until the defrosting temperature of the first evaporator 5 is detected to be equal to that of the second evaporator 6; when the defrosting temperature of the first evaporator 5 is detected to be higher than that of the second evaporator 6, switching the flow of the fourth three-way valve to the right branch to increase proportionally until the detected defrosting temperature of the first evaporator 5 is equal to that of the second evaporator 6; when the defrosting temperature of the first evaporator 5 is detected to be equal to the defrosting temperature of the second evaporator 6, the opening degrees of the fourth three-way reversing valve 21 and the fifth three-way reversing valve 22 are maintained unchanged.
When the first evaporator 5 exits the defrosting mode first, the first electronic expansion valve 14 is directly opened from 0B to the initial step number, so that the space temperature corresponding to the first evaporator 5 can quickly reach a set value, and the second evaporator 6 continues defrosting until the defrosting exit condition is met; when the second evaporator 6 exits the defrosting mode first, the second electronic expansion valve 15 is directly opened from 0B to the initial step number, so that the space temperature corresponding to the first evaporator 5 can quickly reach a set value, and the first evaporator 5 continues defrosting until the defrosting exit condition is met; when the first evaporator 5 and the second evaporator 6 exit the defrosting mode at the same time, the first electronic expansion valve 14 and the second electronic expansion valve 15 are both opened to the initial step number by 0B, so that the space temperatures corresponding to the first evaporator 5 and the second evaporator 6 can quickly reach the set value.
When three evaporators simultaneously meet defrosting conditions, allowing the two evaporators to enter a defrosting state, and allowing the third evaporator to enter defrosting after one evaporator finishes defrosting; the defrosting may be prioritized such that the first evaporator 5 is higher than the second evaporator 6, the second evaporator 6 is higher than the third evaporator 7, and the third evaporator 7 is higher than the fourth evaporator 8.
For example, when the first evaporator 5, the second evaporator 6 and the third evaporator 7 all satisfy the defrosting condition, the first evaporator 5 and the second evaporator 6 are defrosted first, the first three-way reversing valve 18 is switched to open only the downward branch, a part of high-temperature and high-pressure gas discharged by the compressor 1 flows to the second evaporator 6 through the fourth three-way reversing valve 21 to be defrosted, a part of high-temperature and high-pressure gas flows to the first evaporator 5 through the fifth three-way reversing valve 22 to be defrosted, the fourth three-way reversing valve 21 is switched to open the flow of the right branch, and the fifth three-way reversing valve 22 is switched to open half of the flow of the right branch; when the defrosting temperature of the first evaporator 5 is detected to be lower than that of the second evaporator 6, the flow of the right branch of the fifth three-way reversing valve 22 is switched to increase in proportion until the defrosting temperature of the first evaporator 5 is detected to be equal to that of the second evaporator 6; when the defrosting temperature of the first evaporator 5 is detected to be higher than that of the second evaporator 6, switching the flow of the fourth three-way valve to the right branch to increase proportionally until the detected defrosting temperature of the first evaporator 5 is equal to that of the second evaporator 6; when the defrosting temperature of the first evaporator 5 is detected to be equal to the defrosting temperature of the second evaporator 6, the opening degrees of the fourth three-way reversing valve 21 and the fifth three-way reversing valve 22 are maintained unchanged.
When the first evaporator 5 exits the defrosting mode first, the first electronic expansion valve 14 is directly opened from 0B to the initial step number, so that the space temperature corresponding to the first evaporator 5 can quickly reach a set value, the second evaporator 6 continues defrosting until the defrosting exit condition is met, and simultaneously the third evaporator 7 is controlled to enter the defrosting mode according to the defrosting control scheme.
When the second evaporator 6 exits the defrosting mode first, the second electronic expansion valve 15 is directly opened from 0B to the initial step number, so that the space temperature corresponding to the first evaporator 5 can quickly reach the set value, the first evaporator 5 continues defrosting until the defrosting exit condition is met, and simultaneously the third evaporator 7 is controlled to enter the defrosting mode according to the defrosting control scheme.
When the first evaporator 5 and the second evaporator 6 exit the defrosting mode at the same time, the first electronic expansion valve 14 and the second electronic expansion valve 15 are both opened to the initial step number by 0B, so that the space temperatures corresponding to the first evaporator 5 and the second evaporator 6 can quickly reach the set value. Meanwhile, the third evaporator 7 alone enters the defrosting mode.
When four evaporators simultaneously meet defrosting conditions, allowing two evaporators to enter a defrosting mode, and allowing the next evaporator to enter a defrosting state after one evaporator is defrosted; at most, two evaporators are allowed to enter a defrosting state at the same time, and the defrosting priority is higher according to the first evaporator 5 than the second evaporator 6 than the third evaporator 7 than the fourth evaporator 8.
It should be noted that, when too many evaporators satisfying the defrosting condition at the same time and the amount of the high-temperature and high-pressure refrigerant liquid stored in the liquid reservoir 3 is too much, the capacity of the liquid reservoir 3 needs to be selected to be too large, so in this embodiment, when a plurality of evaporators satisfy the defrosting condition at the same time, at most two evaporators are allowed to enter the defrosting mode at the same time, and in addition, the evaporators satisfying the defrosting condition need to be prioritized to ensure that defrosting is performed in order.
In addition, the invention also provides refrigeration equipment adopting the defrosting control method, and in one embodiment, the refrigeration equipment is a refrigeration house, a refrigerator or an air conditioner.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. A refrigeration system comprising a compressor, an outdoor heat exchanger, a reservoir, and at least two indoor heat exchangers, wherein:
in the defrosting mode, an exhaust port of the compressor can be communicated with an indoor heat exchanger to be defrosted or can be simultaneously communicated with the outdoor heat exchanger and the indoor heat exchanger to be defrosted, the indoor heat exchanger and the outdoor heat exchanger are both communicated with the liquid accumulator, a gas-liquid mixture generated after defrosting through the indoor heat exchanger can flow into the liquid accumulator to be mixed with liquid flowing into the liquid accumulator from the outdoor heat exchanger, and the mixed refrigerant liquid in the liquid accumulator can flow into the indoor heat exchanger in the refrigerating mode to be evaporated.
2. The refrigeration system of claim 1 wherein the discharge of said compressor is in communication with said outdoor heat exchanger and/or at least one of said indoor heat exchangers through a first reversing device.
3. The refrigeration system according to claim 1, wherein a corresponding refrigerant pipeline is arranged between each indoor heat exchanger and the outdoor heat exchanger, an electronic expansion valve is arranged on each refrigerant pipeline, refrigerant condensed by the outdoor heat exchanger enters the liquid accumulator, flows through a liquid separator, is separated by the liquid separator, and then flows into the indoor heat exchanger through the adjustment of the electronic expansion valve of the corresponding branch.
4. The refrigerating system according to claim 2, wherein a defrosting pipeline is arranged between each indoor heat exchanger and the first reversing device, a second reversing device is arranged on each defrosting pipeline, at least part of gas discharged by the compressor can flow into the corresponding indoor heat exchanger through the first reversing device and the second reversing device to be defrosted, and a gas-liquid mixture generated after defrosting flows into the liquid accumulator.
5. The refrigerant system as set forth in claim 4, wherein said first reversing device and said second reversing device are each three-way reversing valves.
6. A defrosting control method of a refrigerating system according to any one of claims 1 to 5, comprising the steps of:
step S1: receiving a defrosting instruction;
step S2: controlling the sequence of the indoor heat exchangers entering a defrosting mode according to a defrosting control scheme;
step S3: and controlling the exhaust port of the compressor to be communicated with the evaporator entering the defrosting mode, or controlling the exhaust port of the compressor to be communicated with the condenser and the evaporator entering the defrosting mode simultaneously.
7. The defrosting control method according to claim 6, wherein in the step S3,
when the amount of refrigerant liquid in the liquid storage device cannot meet the requirement of a refrigeration mode, controlling an exhaust port of a compressor to simultaneously communicate the condenser and an evaporator entering a defrosting mode;
and when the quantity of the refrigerant liquid in the liquid storage device can meet the requirement of a refrigeration mode, controlling the exhaust port of the compressor to be communicated with the evaporator entering a defrosting mode.
8. The defrosting control method according to claim 6, wherein when the number of the indoor heat exchangers meeting the defrosting condition is n and the total number of the indoor heat exchangers is not more than 2n, the exhaust port of the compressor is controlled to be communicated with the indoor heat exchangers entering a defrosting mode, and gas exhausted from the compressor enters the indoor heat exchangers meeting the defrosting condition after passing through the first reversing device to be defrosted.
9. The defrosting control method according to claim 6, wherein when the number of the indoor heat exchangers meeting the defrosting condition is n and the number of the indoor heat exchangers is not less than 2n +1, the exhaust port of the compressor is controlled to simultaneously communicate the condenser and the indoor heat exchangers entering the defrosting mode, part of gas discharged by the compressor flows to the outdoor heat exchanger for condensation, and the rest of gas enters the indoor heat exchangers meeting the defrosting condition through the first reversing device for defrosting.
10. The defrosting control method according to claim 8 or 9 wherein the heat exchange areas of all the indoor heat exchangers in the refrigeration system are equal.
11. The defrosting control method according to claim 8 or 9, wherein when the number n of the indoor heat exchangers satisfying the defrosting condition is 2, one of the indoor heat exchangers satisfying the defrosting condition enters a defrosting mode, and after defrosting of one of the indoor heat exchangers is completed, the other indoor heat exchanger satisfying the defrosting condition is allowed to enter the defrosting mode;
when the number n of the indoor heat exchangers meeting the defrosting condition is larger than or equal to 3, allowing two of the indoor heat exchangers meeting the defrosting condition to simultaneously enter a defrosting mode, and allowing the next indoor heat exchanger meeting the defrosting condition to enter the defrosting mode after one of the indoor heat exchangers finishes defrosting.
12. The defrosting control method according to claim 11, wherein when it is detected that the defrosting temperature of one of the indoor heat exchangers is lower than that of the other indoor heat exchanger in the case that the two indoor heat exchangers are simultaneously in the defrosting mode, the flow rate to the branch in which the indoor heat exchanger with the lower defrosting temperature is located is increased until the defrosting temperatures of the two indoor heat exchangers are equal.
13. A refrigeration apparatus comprising the defrosting control method according to any one of claims 6 to 12.
14. The refrigeration appliance of claim 13, wherein the refrigeration appliance is a freezer, or air conditioner.
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