CN114674089B - Multi-connected refrigerating system and refrigerating method thereof - Google Patents
Multi-connected refrigerating system and refrigerating method thereof Download PDFInfo
- Publication number
- CN114674089B CN114674089B CN202210302118.4A CN202210302118A CN114674089B CN 114674089 B CN114674089 B CN 114674089B CN 202210302118 A CN202210302118 A CN 202210302118A CN 114674089 B CN114674089 B CN 114674089B
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- refrigerant
- outlet
- pipe joint
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/04—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases
- F25B43/043—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases for compression type systems
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/09—Improving heat transfers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/13—Mass flow of refrigerants
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a multi-connected refrigerating system and a refrigerating method thereof, wherein the multi-connected refrigerating system comprises an air injection enthalpy-increasing expansion valve, part of refrigerant at the outlet of an outdoor unit heat exchanger flows into a subcooler heat exchanger through the air injection enthalpy-increasing expansion valve, and part of refrigerant at the outlet of the outdoor unit heat exchanger directly enters the cooler heat exchanger; the flash economizer comprises a liquid inlet and outlet pipe joint at the bottom, a refrigerant steam outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing and separating pipe joint, wherein the liquid inlet and outlet pipe joint is connected with a multi-connected indoor unit, a first outlet of a supercooler heat exchanger is connected with the refrigerant gas-liquid mixing and separating pipe joint through an outdoor unit electronic expansion valve, and a second outlet of the supercooler heat exchanger and the refrigerant steam outlet pipe joint are connected with an air suction port of a compressor. The invention solves the problems of large resistance loss along the long piping and low heat exchange efficiency, improves the heat exchange area and the heat exchange efficiency of the indoor heat exchanger, and ensures that the refrigerating system can stably and efficiently run.
Description
Technical Field
The invention relates to the technical field of refrigeration systems, in particular to a multi-connected refrigeration system and a refrigeration method thereof.
Background
In the existing multi-connected refrigerating system, long piping is often arranged between an outdoor unit and a plurality of indoor units, and the long piping can cause great on-way resistance loss, so that the gas content of the refrigerant before entering an expansion valve of the indoor unit after passing through the long piping is increased, and the heat exchange efficiency of the indoor unit heat exchanger of the multi-connected refrigerating system and the single-machine refrigerating and heating capacity are directly affected.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-connected refrigerating system and a refrigerating method thereof, which solve the technical problems of high resistance loss along a long piping and low heat exchange efficiency in the prior art, wherein gas generated after gas-liquid separation of a flash economizer enters a compressor to realize enhanced vapor injection, so that on one hand, the vapor quantity entering a multi-connected indoor unit is reduced, the heat exchange area of the multi-connected indoor unit is increased, the heat exchange quantity of the multi-connected indoor unit is increased, meanwhile, the flash quantity and the flow resistance of refrigerant liquid in the long piping are reduced, the quantity of liquid refrigerant entering the multi-connected indoor unit is increased by performing supercooling treatment on the refrigerant through a supercooler heat exchanger, the refrigerant is effectively separated into gas and liquid through the flash economizer and then enters the multi-connected indoor unit, and the volume utilization rate and the heat exchange efficiency of the multi-connected indoor unit are improved, so that the refrigerating system can stably and efficiently run.
The invention provides a multi-connected refrigerating system, which comprises a compressor, an outdoor heat exchanger, a supercooler heat exchanger and a multi-connected indoor unit which are sequentially connected through pipelines, wherein the multi-connected indoor unit comprises a plurality of indoor unit heat exchangers, and the multi-connected refrigerating system further comprises: the refrigerant at the outlet of the outdoor unit heat exchanger directly enters the cooler heat exchanger; the flash economizer comprises a liquid inlet and outlet pipe joint at the bottom, a refrigerant steam outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing and separating pipe joint, wherein the liquid inlet and outlet pipe joint is connected with a multi-connected indoor unit, a first outlet of a supercooler heat exchanger is connected with the refrigerant gas-liquid mixing and separating pipe joint through an outdoor unit electronic expansion valve, and a second outlet of the supercooler heat exchanger and the refrigerant steam outlet pipe joint are connected with an air suction port of a compressor.
According to the technical scheme, the working principle of the multi-connected refrigerating system is as follows: part of refrigerant output by the outdoor unit heat exchanger directly enters the subcooler heat exchanger, part of refrigerant passes through the subcooler heat exchanger after being expanded and throttled by the jet enthalpy increasing expansion valve, the refrigerant directly entering the subcooler heat exchanger is subjected to subcooling treatment, the refrigerant subjected to subcooling treatment is throttled by the outdoor unit electronic expansion valve and then becomes a gas-liquid two-phase form, the gas-liquid two-phase form enters the flash economizer, liquid in the refrigerant enters the multi-connected indoor unit for heat exchange after being subjected to gas-liquid separation by the flash economizer, the liquid enters the compressor for circulation after absorbing heat, evaporation and gasification, and meanwhile, gas separated in the flash economizer is mixed with refrigerant steam which is expanded and throttled by the jet enthalpy increasing expansion valve and provided with subcooling quantity and then directly enters the compressor for achieving jet enthalpy increasing.
The flash economizer can well complete gas-liquid separation of refrigerants under the middle pressure in the whole refrigeration cycle, and particularly can increase the circulation quantity of the multi-connected indoor unit, so that the heating capacity of the system is increased, the comprehensive energy efficiency ratio of the whole refrigeration system is improved, the content of liquid refrigerants at the inlet of the multi-connected indoor unit can be improved through the linkage action of the jet enthalpy-increasing expansion valve, the supercooler heat exchanger and the flash economizer, the phenomenon that steam directly enters the indoor unit heat exchanger is avoided, the heat exchange area of the indoor unit heat exchanger is reduced due to the fact that the steam occupies the heat exchange area of the indoor unit heat exchanger, the influence on the heat exchange capacity of the indoor unit heat exchanger is reduced, and meanwhile, the flash quantity and the flow resistance of the liquid refrigerants in long pipes are reduced.
In the alternative technical scheme of the invention, an L-shaped refrigerant gas-liquid mixing and separating tube is arranged in the flash economizer, and the refrigerant gas-liquid mixing and separating tube comprises a vertical tube vertically arranged in the flash economizer and a horizontal tube connected to the bottom end of the vertical tube and extending in the direction far away from the liquid inlet-outlet tube joint; the end of the horizontal pipe far away from the vertical pipe is positioned close to the bottom surface of the flash economizer, and the top end of the vertical pipe forms a refrigerant gas-liquid mixing separation pipe joint.
According to the technical scheme, the refrigerant subjected to cold treatment enters the vertical pipe from the refrigerant gas-liquid mixing separation pipe joint and flows out from the end part of the horizontal pipe, which is close to the bottom surface of the flash economizer, at the moment, gas in the refrigerant can flow to the compressor from the refrigerant steam outlet pipe joint at the top of the flash economizer, and liquid in the refrigerant flows to the multi-connected indoor unit from the liquid inlet pipe joint at the bottom of the flash economizer, so that the gas in the refrigerant can be further separated, and the heat exchange efficiency is improved.
In an alternative technical scheme of the invention, the refrigerant heat exchanger further comprises a first one-way valve arranged at the second outlet of the subcooler heat exchanger and a second one-way valve arranged at the joint of the refrigerant steam outlet pipe. The first check valve is used for preventing the gas discharged from the subcooler heat exchanger from flowing back, so that the heat exchange efficiency of the whole system can be ensured. The second check valve is used for preventing the gas from flowing back to the subcooler heat exchanger.
In an alternative technical scheme of the invention, the flash economizer further comprises an electromagnetic valve arranged on one side of the second one-way valve away from the flash economizer, and the flow of gas entering the compressor is controlled.
In the alternative technical scheme of the invention, the invention also comprises a high-pressure stop valve which is arranged between the multi-connected indoor unit and the liquid inlet and outlet pipe joint.
The invention also comprises a four-way valve, wherein the four-way valve comprises a high-pressure air inlet communicated with an air outlet of the compressor, a low-pressure air return port communicated with an air suction port of the compressor, a first reversing port communicated with one end of the multi-connected indoor unit far away from the high-pressure stop valve and a second reversing port communicated with an inlet of the heat exchanger of the outdoor unit; the high-pressure air inlet is communicated with the first reversing port or the second reversing port, and the low-pressure air return is communicated with the second reversing port or the first reversing port.
According to the technical scheme, the high-pressure air inlet is communicated with the first reversing port, the low-pressure air return port is communicated with the second reversing port, so that a high-temperature gaseous refrigerant is input to the heat exchanger of the indoor unit, heating circulation is realized, the high-pressure air inlet is communicated with the second reversing port, and the low-pressure air return port is communicated with the first reversing port, so that a low-temperature liquid refrigerant is input to the heat exchanger of the indoor unit, and refrigerating circulation is realized; the multi-connected refrigerating system is not only suitable for refrigerating circulation, but also suitable for heating circulation, wherein the flash economizer and the supercooler heat exchanger can obviously promote the circulation of the refrigerant under the heating circulation, simultaneously reduce the circulation of the refrigerant in the outdoor heat exchanger during the heating circulation, promote the evaporating temperature in the outdoor heat exchanger, reduce the frosting times and frosting degree of the outdoor heat exchanger and promote the operation comfort of the whole system during the heating.
In the alternative technical scheme of the invention, the air-conditioning system further comprises a low-pressure air-liquid separator arranged between the multi-connected indoor unit and the compressor so as to perform air-liquid separation on the refrigerant subjected to heat exchange of the multi-connected indoor unit, so that the gaseous refrigerant enters the compressor to circulate, and the liquid refrigerant is prevented from entering the compressor and is prevented from damaging the compressor.
In the alternative technical scheme of the invention, the low-pressure stop valve is arranged between the multi-connected indoor unit and the low-pressure gas-liquid separator so as to prevent the refrigerant from flowing back into the indoor unit heat exchanger.
The invention also comprises a pipeline distributor arranged at the outlet of the outdoor unit heat exchanger, wherein the pipeline distributor is provided with a first branch pipe communicated with the subcooler heat exchanger and a second branch pipe communicated with the jet enthalpy-increasing expansion valve, so that the refrigerant output by the outdoor unit heat exchanger can be distributed through the pipeline distributor, the refrigerant is divided into two paths, one path directly enters the subcooler heat exchanger, and the other path directly enters the subcooler heat exchanger for supercooling treatment after expansion and throttling by the jet enthalpy-increasing expansion valve.
The invention also provides a refrigerating method of the multi-connected refrigerating system, which comprises the following steps:
and (3) compressing: starting a compressor, wherein the refrigerant is compressed;
and (3) a cooling step: refrigerant at the outlet of the compressor enters the heat exchanger of the outdoor unit for condensation and heat exchange;
supercooling: part of refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger, and part of refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger after being expanded and throttled by the jet enthalpy-increasing expansion valve so as to subcool the refrigerant directly entering the subcooler heat exchanger;
and a gas-liquid separation step: the refrigerant at the outlet of the subcooler heat exchanger is introduced into the flash economizer from a refrigerant gas-liquid mixing and separating pipe joint to carry out gas-liquid separation;
an enthalpy increasing injection step: the separated gas refrigerant enters the compressor from the refrigerant steam outlet pipe joint;
and (3) refrigerating: the separated liquid refrigerant enters the multi-connected indoor unit from the liquid inlet and outlet pipe joint to be evaporated and gasified and then returns to the compressor.
Drawings
Fig. 1 is a schematic structural diagram of a multi-unit refrigeration system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a refrigeration cycle of a multi-type refrigeration system according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a heating cycle of a multi-connected refrigeration system according to a second embodiment of the present invention.
Fig. 4 is an enlarged schematic view of the flash economizer of the first and second embodiments of the present invention.
Fig. 5 is a pressure enthalpy diagram of a heating cycle of a flash economizer in a second embodiment of the present invention.
Fig. 6 is a flow chart of a refrigeration method of the multi-stage refrigeration system according to the first embodiment of the present invention.
Reference numerals:
the device comprises a 1-compressor, a 2-high-pressure exhaust pipe, a 3-oil-gas separator, a 4-outdoor unit gas collecting pipe, a 5-outdoor unit heat exchanger, a 6-pipeline distributor, a 7-jet enthalpy-increasing expansion valve, an 8-subcooler heat exchanger, a 9-outdoor unit electronic expansion valve, a 10-first one-way valve, a 11-electromagnetic valve, a 12-second one-way valve, a 13-flash economizer, a 14-high-pressure stop valve, a 15-liquid conveying long pipe, a 161-first indoor unit electronic expansion valve, a 162-second indoor unit electronic expansion valve, a 163-third indoor unit electronic expansion valve, a 171-first indoor unit heat exchanger, a 172-second indoor unit heat exchanger, a 173-third indoor unit heat exchanger, a 18-low-pressure stop valve, a 19-four-way valve, a 191-first reversing port, a 192-second reversing port, a 193-high-pressure inlet, a 194-low-pressure return, a 20-low-pressure gas-liquid separator, a 21-return pipe, a 22-compressor inlet, a 23-return pipe, a 24-refrigerant gas-liquid mixture separation pipe joint, a 25-liquid gas-liquid mixture pipe joint, a 172-liquid gas-liquid inlet port joint, a 172-liquid gas-liquid mixture outlet port and a 26-liquid gas-liquid inlet pipe joint.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
[ first embodiment ]
Fig. 1 is a schematic connection diagram of a first embodiment of a multiple refrigeration system according to the present invention. Referring to fig. 1, a first embodiment of the present invention provides a multi-connected refrigeration system, which includes a compressor 1, an outdoor heat exchanger 5, a subcooler heat exchanger 8, and a multi-connected indoor unit sequentially connected by pipelines, wherein the multi-connected indoor unit includes a plurality of indoor unit heat exchangers (in the embodiment of the present invention, a first indoor unit heat exchanger 171, a second indoor unit heat exchanger 172, and a third indoor unit heat exchanger 173 that are arranged in parallel are taken as an example, and one ends of the three indoor unit heat exchangers are connected by a long liquid conveying pipe 15), and the multi-connected refrigeration system further includes: the air injection enthalpy-increasing expansion valve 7, part of refrigerant at the outlet of the outdoor unit heat exchanger 5 flows into the subcooler heat exchanger 8 through the air injection enthalpy-increasing expansion valve 7, and part of refrigerant at the outlet of the outdoor unit heat exchanger 5 directly enters the cooler heat exchanger 8; the flash economizer 13 comprises a liquid inlet and outlet pipe joint 26 at the bottom, a refrigerant steam outlet pipe joint 25 at the top and a built-in refrigerant gas-liquid mixing and separating pipe joint 24, wherein the liquid inlet and outlet pipe joint 26 is connected with a multi-connected indoor unit, a first outlet of the subcooler heat exchanger 8 is connected with the refrigerant gas-liquid mixing and separating pipe joint 24 through an outdoor unit electronic expansion valve 9, and a second outlet of the subcooler heat exchanger 8 and the refrigerant steam outlet pipe joint 25 are connected with an air suction port of the compressor 1; the high-pressure stop valve 14 is arranged between the multi-connected indoor unit and the liquid inlet and outlet pipe joint 26.
The working principle of the multi-connected refrigerating system of the invention is as follows: part of refrigerant output by the outdoor unit heat exchanger 5 directly enters the subcooler heat exchanger 8, part of refrigerant is expanded and throttled by the jet enthalpy increasing expansion valve 7 and then enters the subcooler heat exchanger 8, the refrigerant directly entering the subcooler heat exchanger 8 is subjected to supercooling treatment, the supercooled refrigerant is throttled by the outdoor unit electronic expansion valve 9 and then becomes a gas-liquid two-phase form, the gas-liquid two-phase form enters the flash economizer 13, liquid in the refrigerant enters the multi-connected indoor unit for heat exchange after being subjected to heat absorption, evaporation and gasification and then enters the compressor 1 for circulation, and meanwhile, gas separated in the flash economizer 13 is mixed with refrigerant steam which is expanded and throttled by the jet enthalpy increasing expansion valve 7 and provides supercooling quantity and then directly enters the compressor 1 to realize jet enthalpy increasing.
The flash economizer 13 can well complete gas-liquid separation of the refrigerants under the middle pressure in the whole refrigeration cycle, especially can increase the circulation quantity of the multi-connected indoor unit, further increase the heating capacity of the system, improve the comprehensive energy efficiency ratio of the whole refrigeration system, and the linkage action of the jet enthalpy-increasing expansion valve 7, the supercooler heat exchanger 8 and the flash economizer 13 can improve the content of liquid refrigerants at the inlet of the multi-connected indoor unit, so that the direct steam entering the indoor unit heat exchanger is avoided as much as possible, the heat exchange area of the indoor unit heat exchanger occupied by the steam is reduced, the influence on the heat exchange capacity of the indoor unit heat exchanger is reduced, and meanwhile, the flash quantity and the flow resistance of the liquid refrigerants in long pipes are reduced.
Preferably, a first indoor unit electronic expansion valve 161, a second indoor unit electronic expansion valve 162 and a third indoor unit electronic expansion valve 163 are respectively arranged between the first indoor unit heat exchanger 171, the second indoor unit heat exchanger 172 and the third indoor unit heat exchanger 173 and the high-pressure stop valve 14.
Specifically, the outdoor unit heat exchanger further comprises a pipeline distributor 6 arranged at the outlet of the outdoor unit heat exchanger 5, the pipeline distributor 6 is provided with a first branch pipe communicated with the subcooler heat exchanger 8 and a second branch pipe communicated with the enhanced vapor injection expansion valve 7, so that the refrigerant output by the outdoor unit heat exchanger 5 can be distributed through the pipeline distributor 6 to be divided into two paths, one path of the refrigerant directly enters the subcooler heat exchanger 8, and the other path of the refrigerant directly enters the subcooler heat exchanger 8 after being expanded and throttled by the enhanced vapor injection expansion valve 7 is subjected to supercooling treatment.
Preferably, the outlet of the compressor 1 is communicated with the oil-gas separator 3 through a high-pressure exhaust pipe 2, the oil-gas separator 3 is communicated with the outdoor heat exchanger 5 through an outdoor unit gas collecting pipe 4, the air suction port of the compressor 1 is communicated with the oil-gas separator 3 through an oil return pipe 21, and the air at the outlets of the subcooler heat exchanger 8 and the flash economizer 13 flows into the compressor 1 from a compressor air inlet 22 through an air return pipe 23 for circulation.
Further, the low-pressure gas-liquid separator 20 is arranged between the multi-connected indoor unit and the compressor 1, so that the refrigerant subjected to heat exchange by the multi-connected indoor unit is subjected to gas-liquid separation, and thus the gaseous refrigerant enters the compressor 1 to circulate, and the liquid refrigerant is prevented from entering the compressor 1, and damage to the compressor 1 is avoided. Preferably, a low-pressure stop valve 18 is also arranged between the low-pressure gas-liquid separator 20 and the multi-connected indoor unit.
In a preferred embodiment of the present invention, as shown in fig. 4, the flash economizer 13 has an L-shaped refrigerant gas-liquid mixing and separating tube built therein, and the refrigerant gas-liquid mixing and separating tube includes a vertical tube vertically disposed in the flash economizer 13 and a horizontal tube connected to the bottom end of the vertical tube and extending in a direction away from the liquid inlet-outlet tube joint 26; the end of the horizontal tube remote from the vertical tube is located near the bottom surface of the flash economizer 13, and the top end of the vertical tube forms a refrigerant gas-liquid mixing separation tube joint 24.
Through the above mode, the cold refrigerant enters the vertical pipe from the refrigerant gas-liquid mixing and separating pipe joint 24 and flows out from the end part of the horizontal pipe, which is close to the bottom surface of the flash economizer 13, at the moment, the gas in the refrigerant can flow to the compressor 1 from the refrigerant steam outlet pipe joint 25 at the top of the flash economizer 13, and the liquid in the refrigerant flows to the multi-connected indoor unit from the liquid inlet and outlet pipe joint 26 at the bottom of the flash economizer 13, so that the gas in the refrigerant can be further separated, and the heat exchange efficiency is improved.
Preferably, the internal volume of the flash economizer 13 is 80-95% of the maximum refrigerant flow rate of the system cycle per unit time.
In a preferred embodiment of the present invention, the first check valve 10 provided at the second outlet of the subcooler heat exchanger 8 is further included to prevent the gas discharged from the subcooler heat exchanger 8 from flowing back, so that the heat exchange efficiency of the whole system can be ensured. Still further, the system further comprises a second check valve 12 disposed at the refrigerant vapor outlet pipe joint 25 and a solenoid valve 11 disposed at a side of the second check valve 12 away from the flash economizer 13, wherein the second check valve 12 is used for preventing the gas separated from the flash economizer 13 from flowing back into the flash economizer 13, thereby ensuring the heat exchange efficiency of the whole system. The solenoid valve 11 is used to control the flow of gas into the compressor 1.
Corresponding to the first embodiment of the invention, the invention also provides a refrigeration method of the multi-connected refrigeration system, which comprises the following steps:
and (3) compressing: starting the compressor 1, wherein the refrigerant is compressed in the compressor 1;
and (3) a cooling step: refrigerant at the outlet of the compressor 1 enters an outdoor unit heat exchanger 5 for condensation heat exchange;
supercooling: part of refrigerant at the outlet of the outdoor unit heat exchanger 5 enters the subcooler heat exchanger 8, and part of refrigerant at the outlet of the outdoor unit heat exchanger 5 enters the subcooler heat exchanger 8 after being expanded and throttled by the jet enthalpy-increasing expansion valve 7 so as to subcool the refrigerant directly entering the subcooler heat exchanger 8;
and a gas-liquid separation step: the refrigerant at the outlet of the subcooler heat exchanger 8 is introduced into the flash economizer 13 from the refrigerant gas-liquid mixing and separating pipe joint 24 for gas-liquid separation;
an enthalpy increasing injection step: the separated gas refrigerant enters the compressor 1 from the refrigerant vapor outlet pipe joint 25;
and (3) refrigerating: the separated liquid refrigerant enters the multi-connected indoor unit from the liquid inlet and outlet pipe joint 26 to be evaporated and gasified and then returns to the compressor 1.
In the embodiment of the invention, the gas generated after the gas-liquid separation of the flash economizer 13 enters the compressor 1 to realize the jet enthalpy increase, on one hand, the steam quantity entering the multi-connected indoor unit is reduced, the heat exchange area of the multi-connected indoor unit is increased, the heat exchange quantity of the multi-connected indoor unit is increased, meanwhile, the flash quantity and the flow resistance of the refrigerant liquid in the long piping 15 are reduced, the liquid refrigerant quantity entering the multi-connected indoor unit is increased by performing supercooling treatment on the refrigerant through the supercooler heat exchanger 8, the refrigerant is effectively separated from the gas and the liquid through the flash economizer 13 and then enters the multi-connected indoor unit, and the volume utilization rate and the heat exchange efficiency of the multi-connected indoor unit are improved, so that the refrigerating system can stably and efficiently run.
[ second embodiment ]
The second embodiment of the present invention provides a multi-connected refrigeration system, which is basically similar to the first embodiment in structure, but is different from the first embodiment in that, as shown in fig. 2, the multi-connected refrigeration system further comprises a four-way valve 19, the four-way valve 19 comprises a high-pressure air inlet 193 communicated with the air outlet of the compressor 1, a low-pressure air return 194 communicated with the air suction port of the compressor 1, a first reversing port 191 communicated with one end of the multi-connected indoor unit far from the high-pressure stop valve 14, and a second reversing port 192 communicated with the inlet of the outdoor heat exchanger 5; the high-pressure air inlet 193 is switched to be communicated with the first reversing port 191 or the second reversing port 192, and the low-pressure air return port 194 is switched to be communicated with the second reversing port 192 or the first reversing port 191.
Specifically, the low-pressure gas-liquid separator 20 may be disposed between the low-pressure gas-return port 194 and the compressor 1, when the system is used in a refrigeration cycle (the high-pressure gas-inlet port 193 is connected to the second reversing port 192 and the low-pressure gas-return port 194 is connected to the first reversing port 191), the refrigerant flows to the low-pressure gas-return port 194 through the first reversing port 191 after absorbing heat and gasifying in the indoor unit heat exchanger and enters the low-pressure gas-liquid separator 20 for gas-liquid separation, and the gaseous refrigerant enters the compressor 1 for circulation; when the system is used for heating circulation (the high-pressure air inlet 193 is communicated with the first reversing port 191, the low-pressure air return port 194 is communicated with the second reversing port 192), the refrigerant flows to the low-pressure air return port 194 through the second reversing port 192 after heat exchange and gasification by the outdoor heat exchanger 5, and enters the low-pressure air-liquid separator 20 for gas-liquid separation, and the gaseous refrigerant enters the compressor 1 for circulation.
As shown in fig. 3, when the high pressure air inlet 193 of the four-way valve is communicated with the first reversing port 191 and the low pressure air return port 194 is communicated with the second reversing port 192, the high temperature and high pressure air output by the compressor 1 flows from the high pressure air inlet 193 to the first reversing port 191 and flows into the heat exchanger of the indoor unit to perform exothermic liquefaction, namely, a heating effect is achieved, the refrigerant enters the flash economizer 13 from the liquid inlet/outlet pipe joint 26, at this time, the liquid refrigerant is deposited at the bottom of the flash economizer 13 and flows into the vertical pipe from the horizontal pipe, then enters the subcooler heat exchanger 8, the air injection enthalpy-increasing expansion valve 7 can be opened according to the working condition operation requirement, a small part of the refrigerant is evaporated and performs supercooling on most of the refrigerant in the subcooler heat exchanger 8, then enters the outdoor unit heat exchanger 5 to perform heat exchange into a gaseous state, then flows from the second reversing port 192 to the low pressure air return port 194 and flows into the compressor 1 to perform circulation, and at the same time, the small part of the refrigerant evaporated in the subcooler heat exchanger 8 passes through the first one-way valve 10 and then mixes with the gaseous refrigerant discharged from the flash economizer 13, and then flows into the compressor (the refrigerant in which the vapor state is circulated from the flash economizer 13) to perform circulation, and the vapor phase expansion valve 25 is cooled by the refrigerant, and finally the vapor phase is cooled from the outlet joint 25.
Referring to fig. 5, the heating cycle process of the flash economizer 13 is as follows: the total mass flow m of the refrigerant is throttled at a point c once and is divided into two parts in the flash economizer 13 after being throttled at a point d, the gas m2 after the first part is evaporated from the point d to a point g, the evaporated gas returns to the air injection enthalpy-increasing port of the refrigeration compressor 1 through a pipeline after passing through a one-way valve and the electromagnetic valve 11, the second part mass flow m1 reaches a point e after being changed into supercooled liquid from the point d liquid, reaches a point f after being throttled for the second time by the outdoor unit expansion valve, and the point f to the point a are the completed evaporation heat absorption processes in the supercooler heat exchanger 8 and the outdoor unit heat exchanger 5.
When the high-pressure air inlet 193 of the four-way valve 19 is communicated with the second reversing port 192 and the low-pressure air return port 194 is communicated with the first reversing port 191, as shown in fig. 2, the high-temperature and high-pressure air output by the compressor 1 flows from the high-pressure air inlet 193 to the second reversing port 192 and flows into the outdoor heat exchanger 5 to exchange heat into liquid state, and then is divided into two paths, one path directly enters the subcooler heat exchanger 8, the other path flows into the subcooler heat exchanger 8 after being expanded and throttled by the air injection enthalpy-increasing expansion valve 7 to provide supercooling amount for the refrigerant directly entering the subcooler heat exchanger 8, part of the refrigerant provided with supercooling amount is changed into steam to directly flow into the compressor 1 through the first one-way valve 10 to circulate, the supercooled refrigerant directly flows into the compressor 1 through the outdoor machine electronic expansion valve 9 to circulate through the gas-liquid separation in the flash economizer 13, the gaseous refrigerant flows from the refrigerant steam outlet pipe joint 25 to flow into the indoor machine heat exchanger from the liquid inlet and outlet 26 to absorb heat to gasify, namely the refrigeration effect is realized, and the gasified refrigerant flows from the first reversing port 191 to the low-pressure air inlet and flows into the compressor 1 to circulate through the compressor 1 to complete circulation.
That is, in the second embodiment of the present invention, the high-pressure air inlet 193 communicates with the first reversing port 191 and the low-pressure air return port 194 communicates with the second reversing port 192, so that the high-temperature gaseous refrigerant is input to the indoor heat exchanger, thereby realizing the heating cycle, and the high-pressure air inlet 193 communicates with the second reversing port 192 and the low-pressure air return port 194 communicates with the first reversing port 191, thereby inputting the low-temperature liquid refrigerant to the indoor heat exchanger, thereby realizing the cooling cycle.
Through the mode, the heat exchange area of the indoor unit heat exchanger under the refrigeration working condition can be fully utilized, meanwhile, the heating efficiency of the indoor unit heat exchanger under the heating working condition can be guaranteed, the multi-connected refrigeration system can be suitable for the refrigeration cycle and can also be suitable for the heating cycle, the flash economizer 13 and the supercooler heat exchanger 8 can obviously promote the circulation volume of the refrigerant under the heating cycle, meanwhile, the circulation volume of the refrigerant in the outdoor unit heat exchanger 5 during the heating cycle is reduced, the evaporation temperature in the outdoor unit heat exchanger 5 is improved, the frosting times and frosting degree of the outdoor unit heat exchanger 5 can be reduced, and the operation comfort of the whole system during heating is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The utility model provides a multi-connected refrigerating system, includes compressor, cross valve, off-premises station heat exchanger, subcooler heat exchanger and the multi-connected indoor unit that connects gradually through the pipeline, multi-connected indoor unit is including a plurality of indoor unit heat exchangers, its characterized in that, multi-connected refrigerating system still includes:
the refrigerant at the outlet of the outdoor unit heat exchanger directly enters a supercooling flow path of the supercooling heat exchanger;
the flash economizer comprises a liquid inlet and outlet pipe joint at the bottom, a refrigerant steam outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing and separating pipe joint, wherein the liquid inlet and outlet pipe joint is connected with the multi-connected indoor unit, a first outlet of the subcooler heat exchanger is connected with the refrigerant gas-liquid mixing and separating pipe joint through an outdoor unit electronic expansion valve, and a second outlet of the subcooler heat exchanger and the refrigerant steam outlet pipe joint are connected with an air suction port of the compressor; the first outlet is an outlet of a supercooling flow path of the supercooler heat exchanger, and the second outlet is an outlet of an evaporating flow path of the supercooler heat exchanger;
the flash economizer is internally provided with an L-shaped refrigerant gas-liquid mixing and separating tube, and the refrigerant gas-liquid mixing and separating tube comprises a vertical tube vertically arranged in the flash economizer and a horizontal tube connected to the bottom end of the vertical tube and extending in a direction away from the liquid inlet and outlet pipe joint;
the end part of the horizontal pipe far away from the vertical pipe is positioned close to the bottom surface of the flash economizer and positioned in the flash economizer, and the top end of the vertical pipe forms a refrigerant gas-liquid mixing separation pipe joint and is positioned outside the flash economizer;
the second check valve is arranged at the joint of the refrigerant steam outlet pipe;
the device also comprises an electromagnetic valve arranged on one side of the second one-way valve away from the flash-emission economizer.
2. The multiple refrigerant system as set forth in claim 1, further comprising a high pressure shut-off valve disposed between said multiple indoor unit and said liquid inlet and outlet pipe joint
Between them.
3. The multiple refrigeration system as recited in claim 2 wherein said four-way valve includes a high pressure inlet port in communication with said compressor outlet port, a low pressure return port in communication with said compressor suction port, a first reversing port in communication with an end of said multiple indoor unit remote from said high pressure shut-off valve, and a second reversing port in communication with an inlet of said outdoor heat exchanger;
the high-pressure air inlet is communicated with the first reversing opening or the second reversing opening, and the low-pressure air return opening is communicated with the second reversing opening or the first reversing opening.
4. The multiple refrigerant system as set forth in claim 1, further comprising a low pressure gas-liquid separator disposed between said multiple indoor unit and said compressor.
5. The multiple refrigerant system as set forth in claim 4, further comprising a low pressure shut off valve disposed between said multiple indoor unit and said low pressure gas-liquid separator.
6. The multiple refrigeration system of claim 1, further comprising a line distributor disposed at an outlet of the outdoor heat exchanger, the line distributor being formed with a first branch pipe in communication with the subcooler heat exchanger and a second branch pipe in communication with the enhanced vapor injection expansion valve.
7. A method of cooling a multiple refrigeration system according to claim 1, comprising the steps of:
and (3) compressing: starting the compressor, wherein the refrigerant is compressed;
and (3) a cooling step: refrigerant at the outlet of the compressor enters the heat exchanger of the outdoor unit for condensation and heat exchange;
supercooling: part of refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger, and part of refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger after being expanded and throttled by the enhanced vapor injection expansion valve so as to subcool the refrigerant directly entering the subcooler heat exchanger;
and a gas-liquid separation step: the refrigerant at the outlet of the subcooler heat exchanger is introduced into the flash economizer from the refrigerant gas-liquid mixing and separating pipe joint to carry out gas-liquid separation;
an enthalpy increasing injection step: the separated gas refrigerant enters the compressor from the refrigerant steam outlet pipe joint;
and (3) refrigerating: the separated liquid refrigerant enters the multi-connected indoor unit from the liquid inlet and outlet pipe joint to be evaporated and gasified and then returns to the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302118.4A CN114674089B (en) | 2022-03-24 | 2022-03-24 | Multi-connected refrigerating system and refrigerating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302118.4A CN114674089B (en) | 2022-03-24 | 2022-03-24 | Multi-connected refrigerating system and refrigerating method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114674089A CN114674089A (en) | 2022-06-28 |
| CN114674089B true CN114674089B (en) | 2023-10-13 |
Family
ID=82077097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210302118.4A Active CN114674089B (en) | 2022-03-24 | 2022-03-24 | Multi-connected refrigerating system and refrigerating method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114674089B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007059709A1 (en) * | 2005-11-25 | 2007-05-31 | Gree Electric Appliances Inc. Of Zhuhai | A heat pump system for air conditioning under a low temperature and a using method thereof |
| CN102620463A (en) * | 2012-03-27 | 2012-08-01 | 美的集团有限公司 | Novel low-temperature strong-heat multi-split air conditioning system |
| CN103388923A (en) * | 2013-08-20 | 2013-11-13 | 海信（山东）空调有限公司 | Jetting enthalpy increasing air-conditioning system |
| CN104296413A (en) * | 2014-09-24 | 2015-01-21 | 广东欧科空调制冷有限公司 | Variable frequency low-temperature strong heat air conditioner system |
| CN204438625U (en) * | 2014-12-22 | 2015-07-01 | Tcl空调器(中山)有限公司 | Gas-liquid separator and air-conditioner |
| CN106556175A (en) * | 2016-11-22 | 2017-04-05 | 广东美的暖通设备有限公司 | Air-conditioning system and air-conditioning |
| CN207379106U (en) * | 2017-09-14 | 2018-05-18 | 南京天加环境科技有限公司 | A kind of multi-line system of air injection enthalpy-increasing |
| CN109386986A (en) * | 2018-10-22 | 2019-02-26 | 广东美的暖通设备有限公司 | Two pipes system heat-reclamation multi-compressors system and its air-conditioner outdoor unit |
| CN209944799U (en) * | 2019-01-23 | 2020-01-14 | 新奥数能科技有限公司 | Enhanced vapor injection system and air source heat pump |
| CN211552102U (en) * | 2019-12-31 | 2020-09-22 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioning system |
| CN212720380U (en) * | 2020-08-07 | 2021-03-16 | 广东美芝制冷设备有限公司 | Flash evaporator and refrigeration device |
| WO2021073035A1 (en) * | 2019-10-16 | 2021-04-22 | 广东美的制冷设备有限公司 | Air conditioner and control method therefor, and readable storage medium |
-
2022
- 2022-03-24 CN CN202210302118.4A patent/CN114674089B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007059709A1 (en) * | 2005-11-25 | 2007-05-31 | Gree Electric Appliances Inc. Of Zhuhai | A heat pump system for air conditioning under a low temperature and a using method thereof |
| CN102620463A (en) * | 2012-03-27 | 2012-08-01 | 美的集团有限公司 | Novel low-temperature strong-heat multi-split air conditioning system |
| CN103388923A (en) * | 2013-08-20 | 2013-11-13 | 海信（山东）空调有限公司 | Jetting enthalpy increasing air-conditioning system |
| CN104296413A (en) * | 2014-09-24 | 2015-01-21 | 广东欧科空调制冷有限公司 | Variable frequency low-temperature strong heat air conditioner system |
| CN204438625U (en) * | 2014-12-22 | 2015-07-01 | Tcl空调器(中山)有限公司 | Gas-liquid separator and air-conditioner |
| CN106556175A (en) * | 2016-11-22 | 2017-04-05 | 广东美的暖通设备有限公司 | Air-conditioning system and air-conditioning |
| CN207379106U (en) * | 2017-09-14 | 2018-05-18 | 南京天加环境科技有限公司 | A kind of multi-line system of air injection enthalpy-increasing |
| CN109386986A (en) * | 2018-10-22 | 2019-02-26 | 广东美的暖通设备有限公司 | Two pipes system heat-reclamation multi-compressors system and its air-conditioner outdoor unit |
| CN209944799U (en) * | 2019-01-23 | 2020-01-14 | 新奥数能科技有限公司 | Enhanced vapor injection system and air source heat pump |
| WO2021073035A1 (en) * | 2019-10-16 | 2021-04-22 | 广东美的制冷设备有限公司 | Air conditioner and control method therefor, and readable storage medium |
| CN211552102U (en) * | 2019-12-31 | 2020-09-22 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioning system |
| CN212720380U (en) * | 2020-08-07 | 2021-03-16 | 广东美芝制冷设备有限公司 | Flash evaporator and refrigeration device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114674089A (en) | 2022-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103175344B (en) | Cold-region used multi-connected heat pump system and control method thereof | |
| CN107178833B (en) | Heat recovery external machine system and air conditioning system | |
| CN109386988A (en) | Multi-line system and its outdoor unit, control method and device and storage medium | |
| CN102128508A (en) | Ejector throttling air supplementing system and air supplementing method of heat pump or refrigeration system | |
| CN201666686U (en) | Injector throttling air supplement system | |
| CN109386985B (en) | Two-pipe jet enthalpy-increasing outdoor unit and multi-split system | |
| WO2013146415A1 (en) | Heat pump-type heating device | |
| CN215930202U (en) | Supercooling air return device and air conditioning system | |
| CN108800393B (en) | Air conditioning system | |
| JP2010078164A (en) | Refrigeration and air conditioning device | |
| CN208205490U (en) | A kind of ultra-low temperature air source heat pump based on single machine compression with double stage machine | |
| CN112432255B (en) | Outdoor unit and air conditioner | |
| CN109386989A (en) | Two pipes system air injection enthalpy-increasing outdoor unit and multi-line system | |
| WO2021036115A1 (en) | Refrigeration system | |
| CN114674089B (en) | Multi-connected refrigerating system and refrigerating method thereof | |
| JP2010078165A (en) | Refrigeration and air conditioning device | |
| CN111412687A (en) | Refrigeration and heating integrated heat exchange system | |
| CN215675925U (en) | Large-cooling capacity multi-split air conditioner outdoor unit system | |
| CN216204444U (en) | Air conditioner combining air supply compressor and indoor and outdoor auxiliary heat exchanger | |
| CN214841173U (en) | Hydraulic module of double-four-way valve multi-connected unit | |
| CN208779749U (en) | air conditioning system | |
| CN108007010B (en) | Heat pump system | |
| CN215176171U (en) | Air-cooled heat pump type water chilling unit | |
| JPH06147677A (en) | Air conditioner | |
| CN212205134U (en) | Refrigeration and heating integrated heat exchange system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |