CN112629054A - Multi-connected temperature-changing refrigeration house refrigeration system with single-stage and cascade circulation free conversion - Google Patents
Multi-connected temperature-changing refrigeration house refrigeration system with single-stage and cascade circulation free conversion Download PDFInfo
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- CN112629054A CN112629054A CN202011599650.4A CN202011599650A CN112629054A CN 112629054 A CN112629054 A CN 112629054A CN 202011599650 A CN202011599650 A CN 202011599650A CN 112629054 A CN112629054 A CN 112629054A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 title description 12
- 230000006835 compression Effects 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 24
- 230000005494 condensation Effects 0.000 claims abstract description 18
- 238000009833 condensation Methods 0.000 claims abstract description 18
- 238000010257 thawing Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 26
- 238000003860 storage Methods 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 2
- 239000003507 refrigerant Substances 0.000 description 17
- 238000004891 communication Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction 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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/04—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with more than one refrigeration unit
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a single-stage and cascade circulation freely-converted multi-connection temperature-changing refrigeration house refrigeration system, which comprises a first single-stage circulation system, a second single-stage circulation system and an intermediate heat exchanger system, wherein the first single-stage circulation system comprises a first compression and condensation unit module and at least one first air cooler module; the second single-stage circulating system comprises a second compression condensing unit module and at least one second air cooler module; the first single-stage circulating system and the second single-stage circulating system are connected with the intermediate heat exchanger system; the first single-stage circulating system and the second single-stage circulating system can be operated independently and can be communicated with the intermediate heat exchanger system to form a cascade circulating system, and in the cascade circulating system, the first single-stage circulating system or the second single-stage circulating system can be used as one side of a low-temperature stage. The system can adapt to the temperature change of high and low temperature storehouses, and ensures that the unit operates efficiently at different storehouses.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a multi-connection type temperature-changing refrigeration house refrigeration system with single stage and cascade circulation free conversion.
Background
The assembly type refrigeration house usually adopts a refrigerant system, such as a multi-connection type refrigeration system, compared with a secondary refrigerant system, the refrigerant system has the advantages of less heat transfer links and reduced transmission and distribution energy consumption because the refrigerant and air directly transfer heat in a phase change manner and the energy carried by the refrigerant in unit mass is higher. However, when the temperature required by the assembled refrigerator for storage is low, such as the temperature of a tuna cold storage room is-40 to-60 ℃, the temperature of an ice cream product is-30 ℃, or the outdoor temperature is high, the conventional single-stage compression circulation system is difficult to adapt to the high pressure ratio; and the adoption of a multi-stage compression system is limited by the performance of the refrigerant, the pressure-bearing capacity of a unit and the like.
The cascade refrigeration cycle is to divide the larger total temperature difference into two or more sections, select proper refrigerant cycle according to the temperature zone of each section, and then superpose them, usually by nesting two or more independent refrigeration cycles using medium temperature refrigerant and low temperature refrigerant. Therefore, the cascade refrigeration cycle can be used as the refrigeration system cycle of the refrigeration house, the economic performance of the refrigeration cycle can be improved, the low-temperature performance of the refrigeration cycle can be improved, and lower temperature can be obtained.
Because goods stored in the assembled refrigeration house are frequently changed, the inventory temperature requirements of the assembled refrigeration house have different requirements, and the single-stage compression system and the cascade system can not meet the requirements of the variable-temperature refrigeration house at the same time. In addition, the problem of defrosting of a refrigeration system in a refrigeration house is always a hot topic in the field of low temperature and refrigeration, and defrosting temperature fluctuation has an important influence on the safety of goods stored in the refrigeration house. Therefore, there is a need to develop a temperature-variable refrigeration system that can adapt to the temperature change of high and low temperature storage.
Disclosure of Invention
The embodiment of the invention provides a single-stage cascade circulation freely-converted multi-connected temperature-changing refrigeration house refrigeration system, which is used for solving the technical problem that the refrigeration system in the prior art cannot adapt to the temperature change of a high-temperature and low-temperature storage house.
The embodiment of the invention provides a single-stage cascade circulation freely-converted multi-connected temperature-changing refrigeration house refrigeration system, which comprises:
the first single-stage circulating system comprises a first compression condensing unit module and at least one first air cooler module;
the second single-stage circulating system comprises a second compression condensing unit module and at least one second air cooler module;
the first single-stage circulating system and the second single-stage circulating system are connected with the intermediate heat exchanger system; wherein the content of the first and second substances,
the first single-stage circulating system and the second single-stage circulating system can be operated independently, and can be communicated with the intermediate heat exchanger system to form a cascade circulating system, and in the cascade circulating system, the first single-stage circulating system or the second single-stage circulating system can be used as one side of a low-temperature stage.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the intermediate heat exchanger system comprises an evaporative condenser, and a first pipe body, a second pipe body, a third pipe body and a fourth pipe body which are connected with the evaporative condenser;
the two opposite sides of the first air cooler module and the first compression condensing unit module are connected with the first pipe body and the third pipe body;
and the two opposite sides of the second air cooler module and the second compression and condensation unit module are connected with the second pipe body and the fourth pipe body.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the first air cooler module comprises a first evaporator, a first fan and a first throttling device, wherein the first fan is arranged on one side of the first evaporator;
the second air cooler module comprises a second evaporator, a second fan and a second throttling device, wherein the second fan is arranged on one side of the second evaporator, and the second throttling device is communicated with the fourth pipe body and the second evaporator.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the first compression and condensation module comprises a first gas-liquid separator, a first compressor, a first four-way reversing valve, a first outdoor heat exchanger and a third throttling device;
the second compression and condensation module comprises a second gas-liquid separator, a second compressor, a second four-way reversing valve, a second outdoor heat exchanger and a fourth throttling device.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the first pipe body comprises a first flow pipe, a second flow pipe and a third flow pipe, gas in the first flow pipe flows to the intermediate heat exchanger system through the first air cooler module, gas in the second flow pipe sequentially flows through the first gas-liquid separator and the first compressor to flow to the intermediate heat exchanger system, the third flow pipe is communicated with the second flow pipe, and the third flow pipe sequentially flows through the first four-way reversing valve, the first outdoor heat exchanger and the first throttling device to the third pipe body and further flows to the intermediate heat exchanger system;
the second pipe body comprises a fourth circulating pipe, a fifth circulating pipe and a sixth circulating pipe, gas of the fourth circulating pipe flows to the intermediate heat exchanger system through the second air cooler module, gas of the five pipelines sequentially flows to the intermediate heat exchanger system through the second gas-liquid separator and the second compressor, the sixth circulating pipe is communicated with the fifth circulating pipe, and the sixth circulating pipe sequentially flows to the fourth pipe body through the second four-way reversing valve, the second outdoor heat exchanger and the second throttling device and further flows to the intermediate heat exchanger system.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the middle heat exchanger system also comprises a fifth throttling device, a sixth throttling device, a third four-way reversing valve and a fourth four-way reversing valve;
the fifth throttling device is arranged on the third pipe body, and the third four-way reversing valve is respectively connected with the first through pipe and the second through pipe;
the sixth throttling device is arranged on the fourth pipe body, and the fourth four-way reversing valve is respectively connected with the fourth circulating pipe and the fifth circulating pipe.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the first single-stage circulating system further comprises a first defrosting channel, and the first defrosting channel is respectively connected with the outlet side of the first compressor in the second flow pipe and the first air cooler module;
the second single-stage circulating system further comprises a second defrosting channel, and the second defrosting channel is respectively connected with the outlet side of the second compressor in the fifth circulating pipe and the second air cooler module.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion of the embodiment of the invention,
the first single-stage circulating system further comprises a fifth four-way reversing valve, and the fifth four-way reversing valve is respectively connected with the first defrosting channel, the first air cooler module and the first flow pipe;
the second single-stage circulation system further comprises a sixth four-way reversing valve, and the sixth four-way reversing valve is connected with the second defrosting channel, the second air cooler module and the fourth circulating pipe respectively.
According to the multi-connection temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion, in the cascade circulation system, one side of the low-temperature stage is used for keeping the temperature lower than the evaporation temperature reached when the first single-stage circulation system or the second single-stage circulation system operates independently.
According to the multi-connected temperature-changing refrigeration house refrigeration system with the single-stage and cascade circulation free conversion, in the cascade circulation system, the evaporation condenser comprises an evaporation side and a condensation side, and the evaporation side or the condensation side respectively corresponds to the evaporation end and the condensation end in the first single-stage circulation system or the second single-stage circulation system.
The multi-connected temperature-changing refrigeration house refrigeration system with the single-stage circulation and the cascade circulation freely converted comprises a first single-stage circulation system, a second single-stage circulation system and an intermediate heat exchanger system, wherein the first single-stage circulation system, the second single-stage circulation system and the intermediate heat exchanger system can be combined to form the cascade circulation system, so that a compression condensing unit module in the first single-stage circulation system or the second single-stage circulation system can generate the temperature lower than that of the compression condensing unit module in the single-stage circulation system, and the first single-stage circulation system and the second single-stage circulation system can work independently or form the cascade circulation system together with the intermediate heat exchanger system to provide the lower temperature, so that the system can adapt to the temperature change of high and low temperature storage.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a structural view of an embodiment of a single-stage, cascade cycle free switching, multiple-unit type temperature varying freezer refrigeration system of the present invention;
FIG. 2 is a structural view of another embodiment of the single-stage, cascade cycle free switching, multiple-unit temperature swing refrigeration storage refrigeration system of the present invention;
reference numerals:
10: first single-stage cycle 110: first compression condenser 1110: a first gas-liquid separation system; a group module; a machine;
1130: first four-way reversing 1140: first outdoor heat exchange
1120: a first compressor; a valve; a machine;
1150: the third throttling 120: first air cooler die
Placing; a block; 1210: a first evaporator;
1220: a first fan; 1230: a first throttling device; 130: a first defrost channel;
140: fifth four-way reversing 20: the second single-stage cycle 210: a second compression condensing valve; a system; a unit module;
2110: second gas-liquid separation 2130: a second four-way commutator; 2120: a second compressor; a valve;
2140: second outdoor heat exchange 220: a second air cooler mold; 2150: a fourth throttling device; a block;
2230: second throttle 2210: a second evaporator; 2220: a second fan; placing;
240: sixth four-way reversing 30: intermediate heat exchanger system
230: a second defrost channel; a valve; a system;
310: an evaporative condenser; 320: a first pipe body; 3210: a first flow pipe;
3220: a second flow pipe; 3230: a third flow pipe; 3240: an evaporation side;
3250: a condensing side; 330: a second tube body; 3310: a fourth flow-through pipe;
3320: a fifth flow-through pipe; 3330: a sixth flow-through pipe; 340: a third tube;
350: a fourth tube body; 360: a fifth throttling device; 370: a sixth throttling means;
380: third four-way reversing 390: fourth four-way reversing
A valve; a valve; 40: a throttle valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a structural view of an embodiment of a single-stage, cascade cycle freely-switched multiple-unit temperature-varying freezer refrigeration system of the present invention; fig. 2 is a structural view of another embodiment of the single-stage cascade circulation freely-switched multi-unit temperature-changing refrigeration house refrigeration system of the invention.
Referring to fig. 2, the present invention provides a single-stage, cascade-cycle freely-convertible multi-coupled temperature-varying refrigeration storage refrigeration system, which includes a first single-stage cycle system 10, a second single-stage cycle system 20, and an intermediate heat exchanger system 30, wherein the first single-stage cycle system 10 includes a first compression and condensation unit module 110 and at least one first air cooler module 120; a second single-stage circulation system 20 comprising a second compressor-condenser bank module 210 and at least one second air-cooler module 220; the intermediate heat exchanger system 30, the first single-stage circulating system 10 and the second single-stage circulating system 20 are connected with the intermediate heat exchanger system 30; the first single-stage circulation system 10 and the second single-stage circulation system 20 can be operated independently, and can be connected with the intermediate heat exchanger system 30 to form a cascade circulation system, and in the cascade circulation system, the first single-stage circulation system 10 or the second single-stage circulation system 20 can be used as one side of a low-temperature stage. That is, in the cascade cycle system, the first air cooler module 120 in the first single-stage cycle system 10 or the second air cooler module 220 in the second single-stage cycle system 20 maintains a lower temperature than the first air cooler module 120 or the second air cooler module 220 when the first single-stage cycle system 10 or the second single-stage cycle system 20 is operated alone. Therefore, one side of the first single-stage circulating system 10 or one side of the second single-stage circulating system 20 can be used as a low-temperature side, so that the first single-stage circulating system 10 and the second single-stage circulating system 20 can adapt to the change of a high-low temperature cold storage, and the high-efficiency operation of the unit at different storage temperatures is ensured. It should be noted that the first single stage cycle system 10 and the second single stage cycle system 20 can each be operated independently, and the first single stage cycle system 10, the second single stage cycle system 20, and the intermediate heat exchanger system 30 are operated together to form a cascade cycle system. In the cascade circulation system, the first single-stage circulation system 10 or the second single-stage circulation system 20 can be used as a low-temperature side, and the other side is used as a high-temperature side. For example, when the first single-stage circulation system 10 is used as the low-temperature side, the first air cooler module 120 in the first single-stage circulation system 10 can generate a lower temperature than the temperature maintained by the first air cooler module 120 when the first single-stage circulation system 10 is operated alone, or the temperature maintained by the second air cooler module 220 when the second single-stage circulation system 20 is operated alone, so that the system can adapt to a cold storage with high and low temperature changes.
The specific structure of the first single-stage circulation system 10 and the second single-stage circulation system 20 is as follows:
in the first single-stage circulation system 10, the intermediate heat exchanger system 30 includes an evaporative condenser 310, and a first pipe 320, a second pipe 330, a third pipe 340, and a fourth pipe 350 connected to the evaporative condenser 310; opposite sides of the first air cooler module 120 and the first condensing unit module 110 are connected to the first tube 320 and the third tube 340; the first air cooler module 120 includes a first evaporator 1210, a first fan 1220 disposed at one side of the first evaporator 1210, and a first throttle 1230 communicated with the third tube 340 and the first evaporator 1210; the first compression condensing module includes a first gas-liquid separator 1110, a first compressor 1120, a first four-way reversing valve 1130, a first outdoor heat exchanger 1140, and a third throttling device 1150. The first tube 320 includes a first flow tube 3210, a second flow tube 3220, and a third flow tube 3230, wherein the gas in the first flow tube 3210 flows to the intermediate heat exchanger system 30 through the first air cooler module 120, the gas in the second flow tube 3220 flows to the intermediate heat exchanger system 30 through the first gas-liquid separator 1110 and the first compressor 1120 in sequence, the third flow tube 3230 is communicated with the second flow tube 3220, and the third flow tube 3230 flows to the third tube 340 through the first four-way reversing valve 1130, the first outdoor heat exchanger 1140, and the first throttling device 1230 in sequence, and then flows to the intermediate heat exchanger system 30. The first single-stage circulation system 10 further includes a first defrost channel 130, and the first defrost channel 130 connects the outlet side of the first compressor 1120 and the first air cooler module 120 in the second flow duct 3220, respectively.
In the second single-stage circulation system 20: the second air cooler module 220 and the second condensing unit module 210 are connected to the second tube 330 and the fourth tube 350 on opposite sides thereof; the second air cooler module 220 includes a second evaporator 2210, a second fan 2220 provided at one side of the second evaporator 2210, and a second throttle 2230 communicating with the fourth tube 350 and the second evaporator 2210; the second compression and condensation module comprises a second gas-liquid separator 2110, a second compressor 2120, a second four-way reversing valve 2130, a second outdoor heat exchanger 2140 and a fourth throttling device 2150; the second pipe 330 includes a fourth flow pipe 3310, a fifth flow pipe 3320, and a sixth flow pipe 3330, wherein the gas in the fourth flow pipe 3310 flows from the second air cooler module 220 to the intermediate heat exchanger system 30, the gas in the fifth flow pipe 3320 flows through the second gas-liquid separator 2110 and the second compressor 2120 to the intermediate heat exchanger system 30 in sequence, the sixth flow pipe 3330 communicates with the fifth flow pipe 3320, and the sixth flow pipe 3330 flows through the second four-way selector valve 2130, the second outdoor heat exchanger 2140, and the second throttling device 2230 to the fourth pipe 350 in sequence to flow to the intermediate heat exchanger system 30. The second single-stage circulation system 20 further includes a second defrost channel 230, the second defrost channel 230 being connected to the outlet side of the second compressor 2120 in the fifth flow tube 3320 and the second air-cooler module 220, respectively.
In the intermediate heat exchanger system 30: the intermediate heat exchanger system 30 further includes a fifth throttle device 360, a sixth throttle device 370, a third four-way reversing valve 380, and a fourth four-way reversing valve 390; the fifth throttling device 360 is arranged on the third pipe 340, and the third four-way reversing valve 380 is respectively connected with the first flow pipe 3210 and the second flow pipe 3220; the sixth throttling means 370 is provided in the fourth pipe body 350, and the fourth four-way selector valve 390 is connected to the fourth flow pipe 3310 and the fifth flow pipe 3320, respectively.
Further, the first single-stage circulation system 10 further includes a fifth four-way reversing valve 140, and the fifth four-way reversing valve 140 is respectively connected to the first defrosting channel 130, the first air cooler module 120, and the first flow pipe 3210; the second single-stage circulation system 20 further includes a sixth four-way reversing valve 240, and the sixth four-way reversing valve 240 is connected to the second defrost channel 230, the second air-cooler module 220, and the fourth flow tube 3310, respectively.
Referring to fig. 2, a first outlet side of the first four-way reversing valve 1130, that is, a first four-way reversing valve 1130E side, is closed, a second outlet side of the first four-way reversing valve 1130, that is, a first four-way reversing valve 1130D side, is connected to the first compressor 1120, a third outlet side of the first four-way reversing valve 1130, that is, a first four-way reversing valve 1130S side, is connected to the first flow pipe 3210, and a fourth outlet side of the first four-way reversing valve 1130, that is, a first four-way reversing valve 1130C side, is connected to the first outdoor heat exchanger 1140.
A first outlet side of the second four-way selector valve 2130, that is, the second four-way selector valve 2130E, is closed, a second outlet side of the second four-way selector valve 2130, that is, the second four-way selector valve 2130D, is connected to the second compressor 2120, a third outlet side of the second four-way selector valve 2130, that is, the second four-way selector valve 2130S, is connected to the fourth flow line 3310, and a fourth outlet side of the second four-way selector valve 2130, that is, the second four-way selector valve 2130C, is connected to the second outdoor heat exchanger 2140.
A first outlet side of the third four-way selector valve 380, that is, the third four-way selector valve 380E side, is connected to the evaporative condenser 310, a second outlet side of the third four-way selector valve 380, that is, the third four-way selector valve 380D side, is connected to a second flow pipe 3220, a third outlet side of the third four-way selector valve 380, that is, the third four-way selector valve 380S side, is connected to a first flow pipe 3210, and a fourth outlet side of the second four-way selector valve 2130, that is, the third four-way selector valve 380C side, is closed.
A first outlet side of the fourth four-way selector valve 390, i.e., the fourth four-way selector valve 390E side, is connected to the evaporative condenser 310, a second outlet side of the fourth four-way selector valve 390, i.e., the fourth four-way selector valve 390D side, is connected to the fifth flow pipe 3320, a third outlet side of the fourth four-way selector valve 390, i.e., the fourth four-way selector valve 390S side, is connected to the fourth flow pipe 3310, and a fourth outlet side of the fourth four-way selector valve 390, i.e., the fourth four-way selector valve 390C side, is closed.
A first outlet side of the fifth four-way selector valve 140, that is, the fifth four-way selector valve 140E side, is connected to the first evaporator 1210, a second outlet side of the fifth four-way selector valve 140, that is, the fifth four-way selector valve 140D side, is connected to the first defrost passage 130, a third outlet of the fifth four-way selector valve 140, that is, the fifth four-way selector valve 140S side, is connected to the first flow pipe 3210, and a fourth outlet of the fifth four-way selector valve 140, that is, the C side, is closed.
When the first single-stage circulation system 10 works alone, the side of the fifth four-way reversing valve 140E is communicated with the side of the fifth four-way reversing valve 140S, and the side of the fifth four-way reversing valve 140C is communicated with the side of the fifth four-way reversing valve 140D; the first four-way reversing valve 1130D side is communicated with the first four-way reversing valve 1130C side, the first four-way reversing valve 1130E side is communicated with the first four-way reversing valve 1130S side, the third throttling device 1150 is fully opened, and the first fan 1220 is started to be in a running state. At this time, the side of the third four-way reversing valve 380C in the intermediate heat exchanger system 30 is communicated with the side of the third four-way reversing valve 380D, and the side of the third four-way reversing valve 380E is communicated with the third four-way reversing valve 380S; the fourth four-way reversing valve 390C side is in communication with the fourth four-way reversing valve 390D side, and the fourth four-way reversing valve 390E side is in communication with the fourth four-way reversing valve 390S side. The fifth throttle 360 and the sixth throttle 370 are closed. The first single-stage cycle system 10 is completed by the refrigerator through the first compressor 1120, the first four-way selector valve 1130, the first outdoor heat exchanger 1140, the third throttling device 1150, the first throttling device 1230, the first evaporator 1210, the fifth four-way selector valve 140, and the first gas-liquid separator 1110. In the first single-stage circulation system 10, the first air cooler module 120 provides cooling capacity to the placed cold rooms to meet the storage temperature requirements of the corresponding cold rooms. It can be understood that the refrigerator becomes a high-temperature and high-pressure gaseous refrigerant after passing through the first compressor 1120, when passing through the first outdoor heat exchanger 1140, the refrigerator generates phase change heat release, at this time, the first outdoor heat exchanger 1140 is equivalent to a condenser, and then the refrigerator after passing through the first outdoor heat exchanger 1140 becomes a pure liquid refrigerant, the pure liquid refrigerant flows to the first air cooler module 120 through the third tube 340, the first evaporator 1210 absorbs heat from the outside of the freezer to keep the freezer at a low temperature, meanwhile, the liquid refrigerant becomes a gaseous refrigerant and flows to the first gas-liquid separator 1110, and the gas separated by the first gas-liquid separator 1110 flows to the first compressor 1120 again to form recycling. It is understood that the unused liquid from the first evaporator 1210 can flow to other first evaporators 1210 to form an internal circulation between the plurality of first air cooler modules 120. In addition, the difference in temperature between the evaporator condenser side 3250 of the first single-stage circulation system 10 is typically 30 degrees celsius to 40 degrees celsius, for example, when the first outdoor heat exchanger 1140 acts as a condenser with a corresponding temperature of 20 degrees celsius, then the first evaporator 1210 side can generate a low temperature of-10 degrees to 20 degrees.
It should be noted that the second single-stage recycle system 20 is identical in principle to the first single-stage recycle system 10 and will not be described herein.
When the cascade circulation system is operated, the first single-stage circulation system 10 or the second single-stage circulation system 20 can be used as the low temperature side, and the first single-stage circulation system 10 is used as the low temperature side for explanation. In the first single-stage circulation system 10, the side D of the fifth four-way reversing valve 140 is communicated with the side E of the fifth four-way reversing valve 140, the side C of the fifth four-way reversing valve 140 is communicated with the side S of the fifth four-way reversing valve 140, the third throttling device 1150 is closed, the side C of the first four-way reversing valve 1130 is communicated with the side D of the third four-way reversing valve 380, the side E of the first four-way reversing valve 1130 is communicated with the side S of the third four-way reversing valve 380, and the first fan 1220 is in an on state. In the intermediate heat exchanger system 30, the third four-way selector valve 380D is connected to the third four-way selector valve 380E, and the third four-way selector valve 380S is connected to the third four-way selector valve 380C. The fourth four-way reversing valve 390D side is in communication with the fourth four-way reversing valve 390C, and the fourth four-way reversing valve 390E side is in communication with the fourth reversing valve S side. In the second single-stage circulation system 20, the side of the second four-way reversing valve 2130D is communicated with the side of the second four-way reversing valve 2130C, the side of the second four-way reversing valve 2130E is communicated with the side of the second four-way reversing valve 2130S, the fourth throttling device 2150 is fully opened, the second air cooler module 220 in the second single-stage circulation system 20 is fully closed, the side of the sixth four-way reversing valve 240D is communicated with the side of the sixth four-way reversing valve 240C, and the side of the sixth four-way reversing valve 240E is communicated with the side of the sixth four-way reversing valve 240S. In the cascade cycle system, the first air cooler module 120 absorbs heat from the low temperature refrigerator to maintain the temperature in the low temperature refrigerator, and the evaporative condenser 310 serves as a condenser in the first single-stage cycle system 10. At this time, the second single-stage circulation system 20 is in a high-temperature stage operation, the evaporative condenser 310 serves as an evaporator in the second single-stage circulation system 20, and the second outdoor heat exchanger 2140 serves as a condenser in the second single-stage circulation system 20. Further, in the second single-stage cycle system 20, the high-temperature and high-pressure refrigerator flowing out of the second compressor 2120 passes through the second outdoor heat exchanger 2140 and is converted into a medium-temperature and low-pressure liquid refrigerant, the evaporative condenser 310 serves as an evaporator in the second single-stage cycle system 20 to absorb heat released by the evaporative condenser 310 serving as a condenser in the first single-stage cycle system 10, and the generated low-pressure and low-temperature gas flows to the second gas-liquid separator 2110 and the second compressor 2120 to be recycled. In the first single-stage cycle system 10, the low-temperature liquid generated by the evaporative condenser 310 flows to the first air cooler module 120 for cycle cooling. A cascade cycle system can achieve lower temperatures than operating either the first single stage cycle system 10 or the second single stage cycle system 20 alone. In a cascade cycle system, evaporative condenser 310 includes an evaporative side 3240 and a condensing side 3250. That is, referring to fig. 2, when the first single-stage circulation system 10 is at a low temperature side, the side of the evaporative condenser 310 close to the first single-stage circulation system 10 is a condensation side 3250, and correspondingly, the evaporative condenser 310 is a condenser in the first single-stage circulation system 10 and an evaporator in the second single-stage circulation system 20. The evaporative condenser 310 is on the side adjacent to the second single-stage circulation system 20 as the evaporative side 3240. It should be noted that, similarly, when the second single-stage circulation system 20 is at the low temperature side, the evaporation side 3240 and the condensation side 3250 are disposed at opposite positions to those when the first single-stage circulation system 10 is at the low temperature side, and are not described herein again.
Referring to fig. 2, in addition, in the embodiment of fig. 2, the cascade circulation system can further implement a heat recovery bypass defrosting function and a reverse circulation defrosting function. The first single stage cycle system 10 is exemplified below: wherein, for the heat recovery bypass defrosting function: in the first air cooler module 120 requiring defrosting, the first fan 1220 is stopped, the first throttling device 1230 is fully opened, the side of the fifth four-way reversing valve 140E is connected with the side of the fifth four-way reversing valve 140D, and the side of the fifth four-way reversing valve 140C is connected with the side of the fifth four-way reversing valve 140S. At this time, the high-temperature and high-pressure refrigerator discharged from the first compressor 1120 enters the first air cooler module 120 requiring defrosting through the first defrosting channel 130, and the condensed and heat-released liquid refrigerant enters the third tube 340 through the first throttling device 1230. So set up, can correspond the defrosting to one or two of a plurality of first air-cooler module 120 needs the defrosting.
And for some or all of the first air-cooler modules 120 that require defrosting, a reverse cycle defrost function may be employed. The following were used: taking the first single-stage circulation system 10 as an example, the first fan 1220 in each of the first air cooler modules 120 is stopped, the side of the first four-way reversing valve 1130E is connected to the side of the first four-way reversing valve 1130D, and the side of the first four-way reversing valve 1130C is connected to the side of the first four-way reversing valve 1130S. The first throttling means 1230 is fully open. The fifth four-way reversing valve 140E side is connected to the fifth four-way reversing valve 140D side, the fifth four-way reversing valve 140C side is connected to the fifth four-way reversing valve 140S side, the third four-way reversing valve 380C side is connected to the third four-way reversing valve 380D side in the intermediate heat exchanger system 30, and the third four-way reversing valve 380E side is connected to the third four-way reversing valve 380S side. The fourth four-way reversing valve 390C is connected to the fourth four-way reversing valve 390D, the fourth four-way reversing valve 390E is connected to the fourth four-way reversing valve 390S, and the fifth throttle device 360 and the sixth throttle device 370 are closed. At this time, all the high-temperature and high-pressure gaseous refrigerant at the outlet of the first compressor 1120 enters the first evaporator 1210 of each first air cooler module 120 through the first defrosting channel 130 for condensation, then passes through the first throttling device 1230, is throttled at the third throttling device 1150, then enters the first outdoor heat exchanger 1140 for heat absorption, and then returns to the first gas-liquid separator 1110 and the first compressor 1120 through the first four-way reversing valve 1130.
It should be noted that fig. 1 is a structural view of an embodiment of a single-stage, cascade cycle freely-switched multiple-unit temperature-varying freezer refrigeration system of the present invention; fig. 2 is a structural view of another embodiment of the single-stage cascade circulation freely-switched multi-unit temperature-changing refrigeration house refrigeration system of the invention. Fig. 2 is an improvement on the basis of fig. 1, that is, fig. 2 is additionally provided with a plurality of four-way reversing valves on the basis of fig. 1, and a heat recovery bypass defrosting function and a reverse circulation defrosting function are added, so that the cascade circulation system in fig. 2 can adapt to cold storages with different high and low temperature changes, the unit is ensured to operate efficiently at different storage temperatures, and two defrosting modes can be realized at the same time. In the embodiment of fig. 1, when reverse cycle defrosting is not required, the first four-way reversing valve 1130 may be changed to a throttle valve, and thus, in the embodiment of fig. 1, the first single-stage circulation system 10 and the second single-stage circulation system 20 may be operated independently. Or the first single stage cycle system 10 and the second single stage cycle system 20 together with the intermediate heat exchanger system 30 form a cascade cycle system. That is, for the case where defrosting is not needed, the embodiment shown in fig. 1 may be used, and when periodic defrosting is needed, the corresponding defrosting operation may be performed with reference to the embodiment shown in fig. 2, which is not limited herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a single-stage, overlapping circulation freely change's multiple-connected formula alternating temperature freezer refrigerating system which characterized in that includes:
the first single-stage circulating system comprises a first compression condensing unit module and at least one first air cooler module;
the second single-stage circulating system comprises a second compression condensing unit module and at least one second air cooler module;
the first single-stage circulating system and the second single-stage circulating system are connected with the intermediate heat exchanger system; wherein the content of the first and second substances,
the first single-stage circulating system and the second single-stage circulating system can be operated independently, and can be communicated with the intermediate heat exchanger system to form a cascade circulating system, and in the cascade circulating system, the first single-stage circulating system or the second single-stage circulating system can be used as one side of a low-temperature stage.
2. The single-stage, cascade cycle free changeover, multiple-unit temperature change refrigerator refrigeration system according to claim 1, wherein the intermediate heat exchanger system comprises an evaporative condenser, and a first tube, a second tube, a third tube and a fourth tube connected to the evaporative condenser;
the two opposite sides of the first air cooler module and the first compression condensing unit module are connected with the first pipe body and the third pipe body;
and the two opposite sides of the second air cooler module and the second compression and condensation unit module are connected with the second pipe body and the fourth pipe body.
3. The single-stage, cascade cycle free-switching, multiple-unit temperature-varying freezer refrigeration system of claim 2, wherein the first air cooler module comprises a first evaporator, a first fan disposed on one side of the first evaporator, and a first throttling device communicated with the third tube and the first evaporator;
the second air cooler module comprises a second evaporator, a second fan and a second throttling device, wherein the second fan is arranged on one side of the second evaporator, and the second throttling device is communicated with the fourth pipe body and the second evaporator.
4. The single-stage, cascade cycle free-switching multi-connected temperature-changing refrigeration house refrigeration system according to claim 3, wherein the first compression and condensation module comprises a first gas-liquid separator, a first compressor, a first four-way reversing valve, a first outdoor heat exchanger and a third throttling device;
the second compression and condensation module comprises a second gas-liquid separator, a second compressor, a second four-way reversing valve, a second outdoor heat exchanger and a fourth throttling device.
5. The single-stage, cascade circulation free-switching multiple-unit temperature change refrigerator refrigerating system according to claim 4, wherein the first pipe body comprises a first flow pipe, a second flow pipe and a third flow pipe, gas in the first flow pipe flows from the first air cooler module to the intermediate heat exchanger system, gas in the second flow pipe flows through the first gas-liquid separator and the first compressor to the intermediate heat exchanger system in sequence, the third flow pipe is communicated with the second flow pipe, and the third flow pipe flows through the first four-way reversing valve, the first outdoor heat exchanger and the first throttling device to the third pipe body in sequence and then flows to the intermediate heat exchanger system;
the second pipe body comprises a fourth circulating pipe, a fifth circulating pipe and a sixth circulating pipe, gas of the fourth circulating pipe flows to the intermediate heat exchanger system through the second air cooler module, gas of the five pipelines sequentially flows to the intermediate heat exchanger system through the second gas-liquid separator and the second compressor, the sixth circulating pipe is communicated with the fifth circulating pipe, and the sixth circulating pipe sequentially flows to the fourth pipe body through the second four-way reversing valve, the second outdoor heat exchanger and the second throttling device and further flows to the intermediate heat exchanger system.
6. The single-stage, cascade cycle free-switching, multiple-unit temperature-varying freezer refrigeration system of claim 5, wherein the intermediate heat exchanger system further comprises a fifth throttling device, a sixth throttling device, a third four-way reversing valve, and a fourth four-way reversing valve;
the fifth throttling device is arranged on the third pipe body, and the third four-way reversing valve is respectively connected with the first through pipe and the second through pipe;
the sixth throttling device is arranged on the fourth pipe body, and the fourth four-way reversing valve is respectively connected with the fourth circulating pipe and the fifth circulating pipe.
7. The single-stage, cascade-cycle freely-convertible, multiple-unit temperature-varying freezer refrigeration system of claim 6, wherein the first single-stage circulation system further comprises a first defrost duct, the first defrost duct being connected to the outlet side of the first compressor in the second flow duct and the first air cooler module, respectively;
the second single-stage circulating system further comprises a second defrosting channel, and the second defrosting channel is respectively connected with the outlet side of the second compressor in the fifth circulating pipe and the second air cooler module.
8. The single-stage, cascade-cycle freely-convertible, multiple-unit temperature-varying freezer refrigeration system of claim 7, wherein the first single-stage cycle system further comprises a fifth, four-way reversing valve, the fifth, four-way reversing valve being connected to the first defrost duct, the first air cooler module, and the first flow duct, respectively;
the second single-stage circulation system further comprises a sixth four-way reversing valve, and the sixth four-way reversing valve is connected with the second defrosting channel, the second air cooler module and the fourth circulating pipe respectively.
9. The single-stage, cascade-cycle, freely-convertible, multiple-unit temperature swing refrigeration storage refrigeration system of claim 2, wherein in the cascade cycle system, the low temperature stage side is configured to maintain a temperature lower than the evaporating temperature achieved when the first single-stage cycle system or the second single-stage cycle system is operated alone.
10. The single-stage, cascade-cycle freely-convertible, multiple-unit temperature-varying freezer refrigeration system of claim 2, wherein in the cascade cycle system, the evaporative condenser comprises an evaporation side and a condensation side, and the evaporation side or the condensation side respectively corresponds to an evaporation end and a condensation end in the first single-stage cycle system or the second single-stage cycle system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608213A (en) * | 2022-03-18 | 2022-06-10 | 珠海市精实测控技术有限公司 | High-low temperature working condition cascade refrigeration system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608213A (en) * | 2022-03-18 | 2022-06-10 | 珠海市精实测控技术有限公司 | High-low temperature working condition cascade refrigeration system and control method thereof |
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