CN114674089A - Multi-connected refrigeration system and refrigeration method thereof - Google Patents
Multi-connected refrigeration system and refrigeration method thereof Download PDFInfo
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- CN114674089A CN114674089A CN202210302118.4A CN202210302118A CN114674089A CN 114674089 A CN114674089 A CN 114674089A CN 202210302118 A CN202210302118 A CN 202210302118A CN 114674089 A CN114674089 A CN 114674089A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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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
- 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
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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
- 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
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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
- 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
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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
- F25B2500/00—Problems to be solved
- F25B2500/09—Improving heat transfers
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/13—Mass flow of refrigerants
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Abstract
The invention provides a multi-connected refrigeration system and a refrigeration method thereof, wherein the multi-connected refrigeration system comprises an enhanced vapor injection expansion valve, part of refrigerant at the outlet of an outdoor unit heat exchanger flows into a subcooler heat exchanger through the enhanced vapor injection expansion valve, and part of refrigerant at the outlet of the outdoor unit heat exchanger directly enters a cooler heat exchanger; the flash economizer comprises a liquid inlet-outlet pipe joint at the bottom, a refrigerant vapor outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing separation pipe joint, wherein the liquid inlet-outlet pipe joint is connected with a multi-connected indoor unit, a first outlet of the subcooler heat exchanger is connected with the refrigerant gas-liquid mixing separation pipe joint through an electronic expansion valve of an outdoor unit, and a second outlet of the subcooler heat exchanger and the refrigerant vapor outlet pipe joint are connected with an air suction port of a compressor. The invention solves the problems of large on-way resistance loss and low heat exchange efficiency of the long piping, improves the heat exchange area and the heat exchange efficiency of the indoor heat exchanger, and ensures that a refrigerating system can stably and efficiently operate.
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 refrigeration system, long piping is often arranged between an outdoor unit and a plurality of indoor units, the long piping can cause great on-way resistance loss, the gas content of a refrigerant which enters an expansion valve of the indoor unit after passing through the long piping is increased, and the heat exchange efficiency and the single-unit refrigeration heating capacity of the heat exchanger of the indoor unit of the multi-connected refrigeration system are directly influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-connected refrigeration system and a refrigeration method thereof, which solve the technical problems of large on-way resistance loss and low heat exchange efficiency of a long pipe in the prior art, gas generated after gas-liquid separation of a flash economizer enters a compressor to realize enhanced vapor injection, 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 evaporation amount and the flow resistance of the refrigerant liquid in the long piping are reduced, the quantity of the liquid refrigerant entering the multi-connected indoor unit is increased by performing supercooling treatment on the refrigerant through the subcooler heat exchanger, the refrigerant is subjected to effective gas-liquid separation through the flash economizer and then enters the multi-connected indoor unit, so that the volume utilization rate and the heat exchange efficiency of the multi-connected indoor unit are improved, and the refrigerating system can be stably and efficiently operated.
The invention provides a multi-connected refrigeration system, which comprises a compressor, an outdoor heat exchanger, a subcooler 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 heat exchangers, and the multi-connected refrigeration system also comprises: part of refrigerant at the outlet of the outdoor unit heat exchanger flows into the subcooler heat exchanger through the enhanced vapor injection 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-outlet pipe joint at the bottom, a refrigerant vapor outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing separation pipe joint, wherein the liquid inlet-outlet pipe joint is connected with a multi-connected indoor unit, a first outlet of the subcooler heat exchanger is connected with the refrigerant gas-liquid mixing separation pipe joint through an electronic expansion valve of an outdoor unit, and a second outlet of the subcooler heat exchanger and the refrigerant vapor 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 refrigeration system is as follows: part of the refrigerant output by the outdoor unit heat exchanger directly enters the subcooler heat exchanger, part of the refrigerant is expanded and throttled by the enhanced vapor injection expansion valve and then is introduced into the subcooler heat exchanger, the refrigerant directly entering the subcooler heat exchanger is subcooled, the subcooled refrigerant is throttled by the outdoor unit electronic expansion valve and then is changed into a gas-liquid two-phase state to enter the flash economizer, after gas-liquid separation of the flash economizer, liquid in the refrigerant enters the multi-connected indoor unit for heat exchange, after heat absorption, evaporation and gasification, the refrigerant enters the compressor for circulation, and meanwhile, the gas separated from the flash economizer is mixed with refrigerant steam which is provided with subcooling and comes from the enhanced vapor injection expansion valve to directly enter the compressor to realize enhanced vapor injection.
The flash economizer can well complete the gas-liquid separation of the refrigerant under the intermediate pressure in the whole refrigeration cycle, especially can increase the circulation volume of the multi-connected indoor unit, so as to increase the heating capacity of the system and improve the comprehensive energy efficiency ratio of the whole refrigeration system, and the linkage effect of the jet enthalpy-increasing expansion valve, the subcooler heat exchanger and the flash economizer can improve the content of the liquid refrigerant at the inlet of the multi-connected indoor unit, thereby avoiding the direct steam entering the indoor unit heat exchanger, reducing the heat exchange area of the indoor unit heat exchanger occupied by the steam, reducing the influence on the heat exchange volume of the indoor unit heat exchanger, and simultaneously reducing the flash volume and the flow resistance of the liquid refrigerant in the long piping.
In an optional technical scheme of the invention, an L-shaped refrigerant gas-liquid mixing and separating pipe is arranged in the flash economizer, and the refrigerant gas-liquid mixing and separating pipe comprises a vertical pipe vertically arranged in the flash economizer and a horizontal pipe which is connected with the bottom end of the vertical pipe and extends in a direction far away from a liquid inlet-outlet pipe joint; the end part of the horizontal pipe far away from the vertical pipe is positioned at a position 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 cold medium subjected to cold treatment enters the vertical pipe from the joint of the refrigerant gas-liquid mixing separation pipe and flows out from the end part of the horizontal pipe close to the bottom surface of the flash economizer, at the moment, gas in the cold medium can flow to the compressor from the joint of the refrigerant steam outlet pipe at the top of the flash economizer, and liquid in the cold medium flows to the multi-connected indoor unit at the bottom of the flash economizer and from the liquid inlet and outlet pipe joints, so that the gas in the cold medium can be further separated, and the heat exchange efficiency is improved.
In an optional technical scheme of the invention, the refrigeration system further comprises a first one-way valve arranged at a second outlet of the supercooling heat exchanger and a second one-way valve arranged at a pipe joint of a refrigerant steam outlet. The first check valve is used for preventing gas discharged from the subcooler heat exchanger from flowing back, and the heat exchange efficiency of the whole system can be ensured. The second check valve is used for preventing gas from flowing back to the subcooler heat exchanger.
In an optional technical scheme of the invention, the flash economizer further comprises an electromagnetic valve arranged on one side of the second one-way valve, which is far away from the flash economizer, and the electromagnetic valve is used for controlling the flow of gas entering the compressor.
In an optional technical scheme, the liquid inlet and outlet pipe joint device further comprises a high-pressure stop valve which is arranged between the multi-connected indoor unit and the liquid inlet and outlet pipe joint.
In the optional technical scheme, the multi-split air conditioner further 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-split indoor unit far away from the high-pressure stop valve and a second reversing port communicated with an inlet of an outdoor unit heat exchanger; the high-pressure air inlet is communicated with the first reversing port or the second reversing port, and the low-pressure air return port 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 high-temperature gaseous refrigerants are input into the heat exchanger of the indoor unit, the heating cycle is realized, the high-pressure air inlet is communicated with the second reversing port, the low-pressure air return port is communicated with the first reversing port, and low-temperature liquid refrigerants are input into the heat exchanger of the indoor unit, so that the refrigeration cycle is realized; 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 not only can be suitable for refrigeration circulation, but also can be suitable for heating circulation, the flash economizer and the subcooler heat exchanger can obviously improve the circulation quantity of a refrigerant under the heating circulation, meanwhile, the circulation quantity of the refrigerant in the outdoor unit heat exchanger during the heating circulation is reduced, the evaporation temperature in the outdoor unit heat exchanger is improved, the frosting times and frosting degree of the outdoor unit heat exchanger can be reduced, and the operation comfort level of the whole system during heating is improved.
In an optional technical scheme, the multi-connected air-liquid separator further comprises a low-pressure gas-liquid separator arranged between the multi-connected indoor unit and the compressor, so that gas and liquid of the refrigerant subjected to heat exchange by the multi-connected indoor unit are separated, the gaseous refrigerant enters the compressor to circulate, the liquid refrigerant is prevented from entering the compressor, and the compressor is prevented from being damaged.
In an optional technical scheme, the invention further comprises a low-pressure stop valve arranged between the multi-connected indoor unit and the low-pressure gas-liquid separator, so as to prevent the refrigerant from flowing back to the heat exchanger of the indoor unit.
In an optional technical scheme, the refrigerant distribution device further comprises a pipeline distributor arranged at an 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 enhanced vapor injection 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 of the refrigerant directly enters the subcooler heat exchanger, and the other path of the refrigerant directly enters the subcooler heat exchanger after being expanded and throttled by the enhanced vapor injection expansion valve.
The invention also provides a refrigeration method of the multi-connected refrigeration system, which comprises the following steps:
a compression step: starting a compressor, and compressing a refrigerant in the compressor;
and (3) cooling: the refrigerant at the outlet of the compressor enters an outdoor unit heat exchanger for condensation and heat exchange;
a supercooling step: part of the refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger, and the part of the 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 perform subcooling treatment on the refrigerant directly entering the subcooler heat exchanger;
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 separation pipe joint for gas-liquid separation;
enhanced vapor injection step: the separated gas refrigerant enters a compressor from a refrigerant steam outlet pipe joint;
a refrigeration step: 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-split 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-split 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-split 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 the heating cycle of the flash economizer of the second embodiment of the present invention.
Fig. 6 is a flow chart of a refrigeration method of the multi-type refrigeration system according to the first embodiment of the present invention.
Reference numerals:
1-compressor, 2-high pressure exhaust pipe, 3-oil-gas separator, 4-outdoor machine gas collecting pipe, 5-outdoor machine heat exchanger, 6-pipeline distributor, 7-enhanced vapor injection expansion valve, 8-subcooler heat exchanger, 9-outdoor machine electronic expansion valve, 10-first one-way valve, 11-electromagnetic valve, 12-second one-way valve, 13-flash economizer, 14-high pressure stop valve, 15-liquid conveying long tubing, 161-first indoor machine electronic expansion valve, 162-second indoor machine electronic expansion valve, 163-third indoor machine electronic expansion valve, 171-first indoor machine heat exchanger, 172-second indoor machine heat exchanger, 173-third indoor machine heat exchanger, 18-low pressure stop valve, 19-four-way valve, and the like, 191-a first reversing port, 192-a second reversing port, 193-a high-pressure air inlet, 194-a low-pressure air return port, 20-a low-pressure gas-liquid separator, 21-an oil return pipe, 22-a compressor air inlet, 23-an air return pipe, 24-a refrigerant gas-liquid mixing separation pipe joint, 25-a refrigerant steam outlet pipe joint and 26-a liquid inlet and outlet pipe joint.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
[ first embodiment ] to provide a liquid crystal display device
Fig. 1 is a connection schematic 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 a pipeline, where the multi-connected indoor unit includes a plurality of indoor heat exchangers (in the embodiment of the present invention, a first indoor heat exchanger 171, a second indoor heat exchanger 172, and a third indoor heat exchanger 173 that are arranged in parallel are taken as an example, and one ends of the three indoor heat exchangers are connected by a long liquid conveying pipe 15), and the multi-connected refrigeration system further includes: part of the refrigerant at the outlet of the outdoor heat exchanger 5 flows into the subcooler heat exchanger 8 through the enhanced vapor injection expansion valve 7, and part of the refrigerant at the outlet of the outdoor 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 vapor 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 vapor outlet pipe joint 25 are connected with a suction port of the compressor 1; and 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 refrigeration system is as follows: part of the refrigerant output by the outdoor heat exchanger 5 directly enters the subcooler heat exchanger 8, part of the refrigerant is expanded and throttled by the enhanced vapor injection expansion valve 7 and then is introduced into the subcooler heat exchanger 8, the refrigerant directly entering the subcooler heat exchanger 8 is subcooled, the subcooled refrigerant is throttled by the outdoor electronic expansion valve 9 and then becomes a gas-liquid two-phase state to enter the flash economizer 13, after the gas-liquid separation of the flash economizer 13, the liquid in the refrigerant enters the multi-connected indoor unit for heat exchange, after heat absorption, evaporation and gasification, the refrigerant enters the compressor 1 for circulation, and simultaneously, the gas separated from the flash economizer 13 is mixed with the refrigerant steam which is expanded and throttled by the enhanced vapor injection expansion valve 7 and provides subcooling amount, and then the refrigerant steam directly enters the compressor 1 to realize enhanced vapor injection.
The flash economizer 13 can well complete the gas-liquid separation of the refrigerant under the intermediate pressure in the whole refrigeration cycle, especially can increase the circulation volume 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 subcooler heat exchanger 8 and the flash economizer 13 can improve the content of the liquid refrigerant at the inlet of the multi-connected indoor unit, prevent the steam from directly entering the indoor unit heat exchanger through the indoor unit heat exchanger as much as possible, reduce the heat exchange area of the indoor unit heat exchanger occupied by the steam, reduce the influence on the heat exchange volume of the indoor unit heat exchanger, and simultaneously reduce the flash volume and the flow resistance of the liquid refrigerant in the long tubing.
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 refrigerant system further comprises a pipeline distributor 6 arranged at an outlet of the outdoor unit heat exchanger 5, wherein 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, the refrigerant is divided into two paths, one path directly enters the subcooler heat exchanger 8, and the other path directly enters the subcooler heat exchanger 8 after being expanded and throttled by the enhanced vapor injection expansion valve 7.
Preferably, the outlet of the compressor 1 is communicated with the oil-gas separator 3 through the high-pressure exhaust pipe 2, the oil-gas separator 3 is communicated with the outdoor heat exchanger 5 through the outdoor gas collecting pipe 4, the suction port of the compressor 1 is communicated with the oil-gas separator 3 through the oil return pipe 21, and the gas at the outlets of the subcooler heat exchanger 8 and the flash economizer 13 flows into the compressor 1 from the compressor gas inlet 22 through the gas return pipe 23 for circulation.
Further, the multi-connected air conditioner further comprises a low-pressure gas-liquid separator 20 arranged between the multi-connected indoor unit and the compressor 1, so that gas-liquid separation is performed on the refrigerant subjected to heat exchange by the multi-connected indoor unit, the gaseous refrigerant enters the compressor 1 to circulate, 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 further disposed 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, an L-shaped refrigerant gas-liquid mixing and separating tube is built in the flash economizer 13, and the refrigerant gas-liquid mixing and separating tube includes a vertical tube vertically arranged 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 pipe joint 26; the end of the horizontal tube remote from the vertical tube, the top end of which forms the refrigerant gas-liquid mixture separator coupling 24, is located near the bottom surface of the flash economizer 13.
Through the mode, the cold refrigerant enters the vertical pipe from the refrigerant gas-liquid mixing separation pipe joint 24 and flows out from the end part of the horizontal pipe close to the bottom surface of the flash economizer 13, at the moment, 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 liquid in the refrigerant flows to the multi-connected indoor unit at the bottom of the flash economizer 13 from the liquid inlet-outlet pipe joint 26, so that the gas in the refrigerant can be further separated, and the heat exchange efficiency is improved.
Preferably, the flash economizer 13 has an internal volume of 80-95% of the maximum refrigerant flow rate of the system cycle per unit time.
In the preferred embodiment of the present invention, a first check valve 10 is further included at the second outlet of the subcooler heat exchanger 8 to prevent gas discharged from the subcooler heat exchanger 8 from flowing back, so that the heat exchange efficiency of the whole system can be ensured. Furthermore, the system also comprises a second one-way valve 12 arranged at the joint 25 of the refrigerant vapor outlet pipe and a solenoid valve 11 arranged at one side of the second one-way valve 12 far away from the flash economizer 13, wherein the second one-way 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.
In accordance with the first embodiment of the present invention, the present invention further provides a refrigeration method of a multiple refrigeration system, including the steps of:
a compression step: starting the compressor 1, and compressing a refrigerant in the compressor 1;
and (3) cooling: the refrigerant at the outlet of the compressor 1 enters an outdoor unit heat exchanger 5 for condensation and heat exchange;
a supercooling step: part of the refrigerant at the outlet of the outdoor heat exchanger 5 enters a subcooler heat exchanger 8, and part of the refrigerant at the outlet of the outdoor heat exchanger 5 enters the subcooler heat exchanger 8 after being expanded and throttled by an enhanced vapor injection expansion valve 7 so as to perform supercooling treatment on the refrigerant directly entering the subcooler heat exchanger 8;
a gas-liquid separation step: the refrigerant at the outlet of the subcooler heat exchanger 8 is introduced into the flash economizer 13 from a refrigerant gas-liquid mixing separation pipe joint 24 for gas-liquid separation;
enhanced vapor injection step: the separated gas refrigerant enters the compressor 1 from a refrigerant steam outlet pipe joint 25;
a refrigeration step: the separated liquid refrigerant enters the multi-connected indoor unit from the liquid inlet/outlet pipe joint 26 to be evaporated and gasified and then returns to the compressor 1.
In the embodiment of the invention, gas generated after gas-liquid separation of the flash economizer 13 enters the compressor 1 to realize enhanced vapor injection, on one hand, the amount of steam entering the multi-connected indoor unit is reduced, the heat exchange area of the multi-connected indoor unit is increased, the heat exchange amount of the multi-connected indoor unit is increased, the flash evaporation amount and the flow resistance of refrigerant liquid in the long distribution pipe 15 are reduced, the amount of liquid refrigerant entering the multi-connected indoor unit is increased by supercooling the refrigerant through the subcooler heat exchanger 8, the refrigerant is effectively subjected to gas-liquid separation through the flash economizer 13 and then enters the multi-connected indoor unit, the volume utilization rate and the heat exchange efficiency of the multi-connected indoor unit are improved, and the refrigerating system can stably and efficiently operate.
[ second embodiment ]
The second embodiment of the present invention provides a multi-connected refrigeration system, which has a structure substantially similar to that of the first embodiment, and is different from that of the first embodiment in that, with reference to fig. 2, the multi-connected refrigeration system further comprises a four-way valve 19, wherein the four-way valve 19 comprises a high-pressure air inlet 193 communicated with an air outlet of the compressor 1, a low-pressure air return port 194 communicated with an air suction port of the compressor 1, a first reversing port 191 communicated with one end of the multi-connected indoor unit far away from the high-pressure stop valve 14, and a second reversing port 192 communicated with an 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 for refrigeration cycle (the high-pressure gas inlet 193 is communicated with the second reversing port 192, and the low-pressure gas return port 194 is communicated with the first reversing port 191), the refrigerant absorbs heat in the indoor unit heat exchanger, is gasified, then flows to the low-pressure gas return port 194 through the first reversing port 191, 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 cycle (the high-pressure air inlet 193 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 refrigerant is subjected to heat exchange and gasification by the outdoor heat exchanger 5, flows to the low-pressure air return port 194 through the second reversing port 192, enters the low-pressure gas-liquid separator 20, is subjected to gas-liquid separation, and enters the compressor 1 for circulation.
Referring to 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 return air port 194 is communicated with the second reversing port 192, the high temperature and high pressure gas output by the compressor 1 flows from the high pressure air inlet 193 to the first reversing port 191 and flows into the indoor unit heat exchanger for heat release and liquefaction, thus realizing the heating effect, 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, and then enters the subcooler heat exchanger 8, the jet enthalpy-increasing expansion valve 7 can be opened according to the operating requirement of the working condition, so that a small part of the refrigerant is evaporated and subcooled for most of the refrigerant in the subcooler heat exchanger 8, then enters the outdoor unit heat exchanger 5 for heat exchange to become gaseous, and then flows from the second reversing port 192 to the low pressure return air port 194 and flows to the compressor 1 for circulation, meanwhile, a small part of the refrigerant evaporated in the subcooler heat exchanger 8 passes through the first check valve 10, is mixed with the gaseous refrigerant coming out of the flash economizer 13, and is sucked into the compressor for circulation (wherein the gaseous refrigerant in the flash economizer 13 flows out of the refrigerant vapor outlet pipe joint 25), so that the heating cycle is completed.
Referring to FIG. 5, the heating cycle of the flash economizer 13 is as follows: the total mass flow m of the refrigerant is totally throttled once at the point c, the refrigerant is divided into two parts in the flash economizer 13 after being throttled at the point d, the gas m2 evaporated in the first part is evaporated from the point d to the point g, the evaporated gas passes through the one-way valve and the electromagnetic valve 11 and then returns to the vapor injection enthalpy increasing port of the refrigeration compressor 1 through a pipeline, the mass flow m1 in the second part reaches the point f after the liquid at the point d becomes the supercooled liquid and then reaches the point f after being secondarily throttled by the outdoor unit expansion valve, and the point f to the point a are the evaporation heat absorption processes finished in the subcooler 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, high-temperature and high-pressure gas output by the compressor 1 flows from the high-pressure air inlet 193 to the second reversing port 192 and flows into the outdoor unit heat exchanger 5 to be heat-exchanged into liquid state, and then is divided into two paths, wherein one path directly enters the subcooler heat exchanger 8, the other path is expanded and throttled by the enhanced vapor injection expansion valve 7 and then flows into the subcooler heat exchanger 8 to provide refrigeration capacity for the refrigerant directly entering the subcooler heat exchanger 8, part of the refrigerant providing refrigeration capacity is changed into steam, and directly flows into the compressor 1 for circulation through the first one-way valve 10, the subcooled refrigerant enters the flash economizer 13 through the outdoor unit electronic expansion valve 9 for gas-liquid separation, and the gaseous refrigerant directly flows into the compressor 1 from the refrigerant steam outlet 25 for circulation, the liquid refrigerant flows from the liquid inlet/outlet pipe joint 26 to the indoor unit heat exchanger to absorb heat and gasify, i.e., the refrigeration effect is realized, and the gasified refrigerant flows from the first reversing port 191 to the low-pressure return port 194 and flows into the compressor 1 to circulate, thereby completing the refrigeration cycle.
That is, in the second embodiment of the present invention, the high pressure inlet 193 is communicated with the first direction changing port 191 and the low pressure return air port 194 is communicated with the second direction changing port 192 to input high temperature gaseous refrigerant to the indoor unit heat exchanger, thereby implementing a heating cycle, and the high pressure inlet 193 is communicated with the second direction changing port 192 and the low pressure return air port 194 is communicated with the first direction changing port 191 to input low temperature liquid refrigerant to the indoor unit heat exchanger, thereby implementing a refrigeration cycle.
In this way, fully ensured under the refrigeration operating mode that the heat transfer area of indoor set heat exchanger can obtain make full use of, can guarantee the efficiency of heating of indoor set heat exchanger under the operating mode of heating again simultaneously, this multiple refrigeration system not only can be applicable to refrigeration cycle, can also be applicable to the heating cycle, the circulation volume of refrigerant under the heating cycle can obviously be promoted to flash economizer 13 and subcooler heat exchanger 8 wherein, reduce the circulation volume of refrigerant in the outdoor unit heat exchanger 5 when heating cycle simultaneously, promote the evaporating temperature in the outdoor unit heat exchanger 5, just also can reduce the number of times of frosting and the degree of frosting of outdoor unit heat exchanger 5, promote the running comfort of entire system when heating.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a multiple refrigerant system, includes compressor, off-premises station heat exchanger, subcooler heat exchanger and the indoor unit that ally oneself with that connects gradually through the pipeline, the indoor unit that ally oneself with is including a plurality of indoor unit heat exchangers, its characterized in that, multiple refrigerant system still includes:
part of refrigerant at the outlet of the outdoor unit heat exchanger flows into the subcooler heat exchanger through the enhanced vapor injection expansion valve, and part of refrigerant at the outlet of the outdoor unit heat exchanger directly enters the subcooler heat exchanger;
the flash economizer comprises a liquid inlet-outlet pipe joint at the bottom, a refrigerant vapor outlet pipe joint at the top and a built-in refrigerant gas-liquid mixing separation pipe joint, wherein the liquid inlet-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 separation pipe joint through an outdoor unit electronic expansion valve, and a second outlet of the subcooler heat exchanger and the refrigerant vapor outlet pipe joint are connected with an air suction port of the compressor.
2. The multi-connected refrigeration system according to claim 1, wherein an L-shaped refrigerant gas-liquid mixing and separating pipe is arranged in the flash economizer, and the refrigerant gas-liquid mixing and separating pipe comprises a vertical pipe vertically arranged in the flash economizer and a horizontal pipe connected to the bottom end of the vertical pipe and extending in a direction away from the liquid inlet/outlet pipe joint;
the end part of the horizontal pipe, which is far away from the vertical pipe, is positioned at a position close to the bottom surface of the flash economizer, and the top end of the vertical pipe forms the joint of the refrigerant gas-liquid mixing separation pipe.
3. The multi-split refrigeration system as claimed in claim 1, further comprising a first check valve disposed at a second outlet of the subcooling heat exchanger and a second check valve disposed at a joint of the refrigerant vapor outlet pipe.
4. The multi-split refrigerant system of claim 3, further comprising a solenoid valve disposed on a side of the second one-way valve remote from the flash economizer.
5. The multi-split refrigeration system as claimed in claim 1, further comprising a high pressure stop valve disposed between the multi-split indoor unit and the liquid inlet/outlet pipe joint.
6. The multi-connected refrigeration system according to claim 1, further comprising 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 outdoor heat exchanger;
the high-pressure air inlet is communicated with the first reversing port or the second reversing port, and the low-pressure air return port is communicated with the second reversing port or the first reversing port.
7. The multi-split refrigeration system as claimed in claim 1, further comprising a low-pressure gas-liquid separator disposed between the multi-split indoor unit and the compressor.
8. The multi-split refrigeration system as claimed in claim 7, further comprising a low pressure stop valve disposed between the multi-split indoor unit and the low pressure gas-liquid separator.
9. The multi-connected refrigeration system according to claim 1, further comprising a pipeline distributor disposed at an outlet of the outdoor heat exchanger, wherein the pipeline distributor is formed with a first branch pipe communicated with the subcooler heat exchanger and a second branch pipe communicated with the enhanced vapor injection expansion valve.
10. A method of refrigerating a multi-split refrigeration system as recited in claim 1, comprising the steps of:
a compression step: starting the compressor, and compressing a refrigerant in the compressor;
and (3) cooling: the refrigerant at the outlet of the compressor enters the heat exchanger of the outdoor unit for condensation and heat exchange;
a supercooling step: part of the refrigerant at the outlet of the outdoor unit heat exchanger enters the subcooler heat exchanger, and the part of the 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 perform subcooling treatment on the refrigerant directly entering the subcooler heat exchanger;
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 separation pipe joint for gas-liquid separation;
enhanced vapor injection step: the separated gas refrigerant enters the compressor from the refrigerant vapor outlet pipe joint;
a refrigeration step: 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.
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