CN115342425B - A multi-connected air conditioner - Google Patents
A multi-connected air conditioner Download PDFInfo
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- CN115342425B CN115342425B CN202110519614.0A CN202110519614A CN115342425B CN 115342425 B CN115342425 B CN 115342425B CN 202110519614 A CN202110519614 A CN 202110519614A CN 115342425 B CN115342425 B CN 115342425B
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- 239000007788 liquid Substances 0.000 claims abstract description 165
- 238000012546 transfer Methods 0.000 claims abstract description 79
- 239000002918 waste heat Substances 0.000 claims abstract description 41
- 238000011084 recovery Methods 0.000 claims abstract description 37
- 239000003507 refrigerant Substances 0.000 claims description 153
- 238000010438 heat treatment Methods 0.000 claims description 68
- 238000001816 cooling Methods 0.000 claims description 65
- 239000007789 gas Substances 0.000 claims description 23
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Analytical Chemistry (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
本发明提供了一种多联机空调，所述多联机空调包括：室外机；多个中转单元，通过气管与液管连接至所述室外机；多个室内机；多个所述室内机与多个所述中转单元一一对应连接；废热回收管，设置在多个所述中转单元之间，用于回收中转单元之间的废热。本发明能够解决中转单元与室内机之间距离有限以及在多联机空调运行时热量浪费，效率较低的技术问题。
The present invention provides a multi-split air conditioner, comprising: an outdoor unit; a plurality of transfer units connected to the outdoor unit through an air pipe and a liquid pipe; a plurality of indoor units; a plurality of indoor units connected to a plurality of transfer units in a one-to-one correspondence; and a waste heat recovery pipe arranged between the plurality of transfer units for recovering waste heat between the transfer units. The present invention can solve the technical problems of limited distance between the transfer unit and the indoor unit, heat waste and low efficiency when the multi-split air conditioner is running.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner.
Background
The multi-split air conditioner is widely applied at present, and two or more indoor units are connected through one outdoor unit by using a piping, so that the purpose of one control is achieved, and the requirements of simultaneous refrigeration, simultaneous heating and simultaneous cooling and heating of a plurality of indoor units are met in the process.
At present, although a multi-split air conditioner with simultaneous cooling and heating functions is provided, a transfer unit needs to be additionally arranged between an outdoor unit and an indoor unit to achieve the purpose of simultaneous cooling and heating of a plurality of indoor units, but the set transfer unit is a centralized transfer unit, namely one transfer unit is connected with a plurality of indoor units, if the number of indoor units connected with the transfer unit is large, the distance between the indoor units and the transfer unit can be increased, and after the distance exceeds a certain distance, the refrigerating or heating efficiency of the indoor units can be affected, and even if a one-to-one connection mode of the transfer unit and the indoor units is adopted, the defects of heat loss and low efficiency exist.
Disclosure of Invention
The invention can solve the technical problems of limited distance between the transfer unit and the indoor unit and low efficiency due to heat waste during the operation of the multi-split air conditioner.
The invention provides a multi-split air conditioner which comprises an outdoor unit, a plurality of transfer units, a plurality of indoor units and a waste heat recovery pipe, wherein the transfer units are connected to the outdoor unit through air pipes and liquid pipes, the indoor units are connected with the transfer units in a one-to-one correspondence mode, and the waste heat recovery pipe is arranged among the transfer units and used for recovering waste heat among the transfer units.
Each transfer unit is connected with each indoor unit in a one-to-one correspondence manner, the purpose that a single transfer unit controls a single indoor unit is achieved, the limitation of the distance between the transfer unit and the indoor unit is avoided relative to a centralized transfer unit, further, the waste heat recovery pipe can recover waste heat between the transfer units, waste of heat is avoided, and the use efficiency of an air conditioner is effectively improved.
Further, in an embodiment of the present invention, each of the transfer units includes a gas-liquid separator, and the high-pressure refrigerant is separated into a high-pressure gas refrigerant and a high-pressure liquid refrigerant by the gas-liquid separator when the outdoor unit is in the cooling mode, and the high-pressure gas refrigerant is delivered to any one of the indoor units if the indoor unit is in the heating mode, and the high-pressure liquid refrigerant is delivered to any one of the indoor units if the indoor unit is in the cooling mode.
The gas-liquid separator can separate high-pressure refrigerant, so that the gas-liquid separator can provide high-pressure liquid refrigerant for the indoor unit in a refrigerating mode and high-pressure gaseous refrigerant for the indoor unit in a heating mode, and the aim of simultaneously cooling and heating the multi-split air conditioner is fulfilled by the separated high-pressure liquid refrigerant and the high-pressure gaseous refrigerant, so that the refrigerating or heating efficiency of the air conditioner is improved.
Further, in an embodiment of the present invention, the liquid refrigerant in the indoor unit in the heating mode is supplied to the indoor unit in the cooling mode through the waste heat recovery pipe.
Through the arrangement of the waste heat recovery pipe, the high-pressure liquid generated by the indoor unit in the heating mode can be conveyed to the indoor unit in the refrigerating mode, the purpose of waste heat recovery between the transfer units is achieved, and in the mode, the refrigerating efficiency of the indoor unit in the refrigerating mode is improved.
Further, in one embodiment of the present invention, the gas-liquid separator is disposed between the liquid pipe and the indoor unit, the gas-liquid separator includes an inlet, a gas outlet and an outlet, the outlet of the gas-liquid separator of the indoor unit in the cooling mode is communicated with the indoor unit refrigerant inlet, the gas outlet is communicated with the gas pipe, the outlet of the gas-liquid separator of the indoor unit in the heating mode is communicated with the indoor unit refrigerant inlet in the cooling mode through the waste heat recovery pipe, and the inlet is communicated with the liquid pipe.
The liquid pipe is connected with the inlet of the gas-liquid separator, so that a high-pressure refrigerant is provided for the gas-liquid separator, the gas-liquid separator is used for providing a high-pressure liquid refrigerant or a high-pressure gas refrigerant for the indoor units, heating or refrigerating of different indoor units is realized, and the arrangement of a plurality of openings of the gas-liquid separator is better realized, so that the full use of heat among different indoor units is better realized, and the heating and refrigerating effects of the air conditioner are improved.
Further, in an embodiment of the present invention, a refrigerant outlet of the indoor unit in the heating mode is communicated with a refrigerant inlet of the indoor unit in the cooling mode through the waste heat recovery pipe.
The refrigerant outlet of the indoor unit in the heating mode is connected to the refrigerant inlet of the indoor unit in the refrigerating mode through the waste heat recovery pipe, so that a high-pressure refrigerant is provided for the indoor unit in the refrigerating mode, and the refrigerating efficiency of the indoor unit in the refrigerating mode is further enhanced.
Further, in an embodiment of the present invention, each of the transfer units includes a jet pump, and when the outdoor unit is in the heating mode, if any one of the indoor units is in the heating mode, a high-pressure gaseous refrigerant is delivered to the outdoor unit, and a part of the high-pressure liquid refrigerant passing through the indoor unit is delivered to the liquid pipe, and another part of the high-pressure liquid refrigerant is delivered to the transfer unit of the indoor unit in the cooling mode through the waste heat recovery pipe.
In another case, the outdoor unit is in a heating mode, a high-pressure gaseous refrigerant is provided for the indoor unit in a heating mode, and then the high-pressure liquid cold formed by the conversion of the indoor unit is conveyed to the indoor unit in a cooling mode, so that the recovery of waste heat between the transfer units is fully realized in the state, the waste of resources is reduced, and the efficiency of the air conditioner is improved.
Further, in one embodiment of the present invention, a part of the high-pressure liquid refrigerant in the transfer unit of the indoor unit in the cooling mode is delivered to the indoor unit in the cooling mode, and the other part of the high-pressure liquid refrigerant is delivered to the jet pump, wherein the high-pressure liquid refrigerant delivered to the jet pump is used for draining the low-pressure gaseous refrigerant generated by the indoor unit in the cooling mode.
The indoor unit in the refrigeration mode converts the high-pressure liquid refrigerant into the low-pressure gaseous refrigerant, the low-pressure gaseous refrigerant is subjected to pressure boosting treatment through the jet pump and then is conveyed into the liquid pipe, and in the process, the low-pressure gaseous refrigerant is mixed with part of the high-pressure liquid refrigerant in the waste heat recovery pipe, so that the requirement of increasing the diameter of a piping due to conveying of the low-pressure gaseous refrigerant is avoided, the specification requirement of the piping is reduced, and materials are saved.
Further, in an embodiment of the present invention, each of the transfer units further includes a gas-liquid separator disposed between the liquid pipe and the indoor unit, the gas-liquid separator including an inlet, a gas outlet, and an outlet.
The arrangement of the gas-liquid separator further enhances the mixing between the liquid refrigerant and the gaseous refrigerant and can be used as a liquid storage cavity of the mixed fluid at the moment, so that the air conditioning efficiency is improved, and meanwhile, the mixing of the low-pressure gaseous refrigerant and the high-pressure liquid refrigerant in the pipeline is further enhanced.
Further, in an embodiment of the present invention, in the heating main mode, the refrigerant outlet of the indoor unit in the heating mode is connected to the inlet, the refrigerant outlet of the indoor unit in the cooling mode is connected to the inlet via the ejector pump, and the outlet is connected to the liquid pipe.
The ejector pump can achieve the beneficial effects of recovering expansion loss and not conveying low-pressure gaseous refrigerant when heating is in a main mode.
Further, in one embodiment of the invention, the ejector pump is provided with a driving inflow port, a suction inflow port and an ejector pump outlet, wherein the refrigerant outlet of the indoor unit in the cooling mode is communicated with the suction inflow port in the heating main mode of the outdoor unit, the driving inflow port is communicated with the waste heat recovery pipe, and the ejector pump outlet is communicated with the inlet of the gas-liquid separator.
Through drive inflow port and suction inflow port, make high-pressure liquid refrigerant and low-pressure gaseous refrigerant can be in the inside mixing of ejector pump, further carry out the pressure boost processing to the fluid after mixing, finally by ejector pump export transport to the liquid pipe, in this process, through the absorption processing to low-pressure gaseous refrigerant, realized not needing to increase the purpose of piping diameter transport fluid, saved the cost.
In summary, after the technical scheme of the invention is adopted, the following technical effects can be achieved:
i) Each transfer unit is correspondingly connected with a single indoor unit, so that the limitation of the distance between the indoor units and the transfer units during connection is avoided;
ii) the arrangement of the waste heat recovery pipe can realize the recovery of waste heat between the transfer units, and further improve the refrigerating or heating efficiency of the indoor unit;
iii) The arrangement of the gas-liquid separator improves the separation of the gaseous refrigerant and the liquid refrigerant;
iv) the arrangement of the jet pump avoids the requirement of increasing the diameter of the conveying pipe due to conveying low-pressure gaseous refrigerant when the heating is in a main mode, and further saves the cost.
Drawings
Fig. 1 is a schematic structural diagram of a multi-split air conditioner 100 according to a first embodiment of the present invention.
Fig. 2 is a refrigerant flow chart when the first indoor unit 30 and the second indoor unit 50 shown in fig. 1 are simultaneously cooling.
Fig. 3 is a refrigerant flow chart when the first indoor unit 30 and the second indoor unit 50 shown in fig. 1 are simultaneously heating.
Fig. 4 is a flow chart of the refrigerant when the first indoor unit 30 shown in fig. 1 is cooling and the second indoor unit 50 is heating.
Fig. 5 is a flow chart of the refrigerant when the first indoor unit 30 heats and the second indoor unit 50 cools in fig. 1.
Fig. 6 is a schematic diagram of the structure of the second jet pump 42 in fig. 5.
Reference numerals illustrate:
100-multi-split air conditioner, 10-outdoor unit, 11-reservoir, 12-compressor, 13-four-way valve, 14-first heat exchanger, 15-outdoor expansion valve, 20-first transfer unit, 21-first gas-liquid separator, 22-first injection pump, 23-first check valve, 24-second check valve, 25-first solenoid valve, 26-second solenoid valve, 27-first expansion valve, 28-second expansion valve, 30-first indoor unit, 31-second heat exchanger, 32-first indoor expansion valve, 40-second transfer unit, 41-second gas-liquid separator, 411-gas cavity, 412-liquid cavity, 42-second injection pump, 421-mixing unit, 422-second compressor, 423-condenser, 424-evaporator, 43-third check valve, 44-fourth check valve, 45-third solenoid valve, 46-fourth solenoid valve, 47-third expansion valve, 48-fourth expansion valve, 50-second indoor unit, 41-second gas pipe, 51-third solenoid valve, and 80-indoor waste heat recovery pipe.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
[ First embodiment ]
The embodiment of the invention provides a multi-split air conditioner 100, wherein the multi-split air conditioner 100 comprises an outdoor unit 10, a plurality of transfer units and a plurality of indoor units, wherein the transfer units are connected to the outdoor unit 10 through air pipes 60 and liquid pipes 70, the indoor units are connected in one-to-one correspondence with the transfer units.
Preferably, as an example of two relay units and the indoor units, referring to fig. 1 to 3, the relay units include a first relay unit 20 and a second relay unit 40, the indoor units include a first indoor unit 30 and a second indoor unit 50, wherein the first relay unit 20 and the second relay unit 40 are connected to an outdoor unit 10 through an air pipe 60 and a liquid pipe 70, the first indoor unit 30 is connected to the first relay unit 20, the second indoor unit 50 is connected to the second relay unit, and the outdoor unit 10 includes a reservoir 11, a compressor 12, a four-way valve 13, a first heat exchanger 14 and an outdoor expansion valve 15 sequentially connected by pipes.
Preferably, the first transfer unit 20 and the second transfer unit 40 are internally provided with a pipeline 90, the pipeline 90 is arranged to realize communication among the first indoor unit 30, the second indoor unit 50 and the outdoor unit 10, and the further outdoor unit 10 realizes heating and cooling effects on the first indoor unit 30 and the second indoor unit 50 through the pipeline 90.
Specifically, the pipeline 90 comprises a first pipeline 91, a second pipeline 92, a third pipeline 93 and a fourth pipeline 94, wherein the first pipeline 91 and the second pipeline 92 are arranged on the first transfer unit 20, one end of the first pipeline 91 is connected to the air pipe 60, the second pipeline 92 is connected to the liquid pipe 70, the first indoor unit 30 is connected between the first pipeline 91 and the second pipeline 92, the third pipeline 93 and the fourth pipeline 94 are arranged on the second transfer unit 40, the third pipeline 93 is connected to the air pipe 60, the fourth pipeline 94 is connected to the liquid pipe 70, the second indoor unit 50 is connected between the third pipeline 93 and the fourth pipeline 94, it is understood that the internal structures of the first transfer unit 20 and the second transfer unit 40 are identical, and the multi-split air conditioner 100 further comprises a waste heat recovery pipe 80 connected between the second pipeline 92 and the fourth pipeline 94.
Preferably, when there are two transfer units, the gas-liquid separator comprises a first gas-liquid separator 21 and a second gas-liquid separator 41, wherein the first gas-liquid separator 21 is arranged on the first transfer unit 20, the second gas-liquid separator 41 is arranged on the second transfer unit 40, the further first transfer unit 20 further comprises a first jet pump 22, the first gas-liquid separator 21 is arranged on the second pipeline 92 and is positioned between the waste heat recovery pipe 80 and the liquid pipe 70, the first jet pump 22 is arranged between the first pipeline 91 and the second pipeline 92, and further, a first expansion valve 27, a second expansion valve 28, a first electromagnetic valve 25 and a second electromagnetic valve 26 are further arranged in the first transfer unit 20 and are used for controlling the flow of the refrigerant in the first transfer unit 20.
Further, the first transfer unit 20 is further provided with a first check valve 23 and a second check valve 24, which are respectively disposed between the first pipe 91 and the first jet pump 22, and between the second pipe 92 and the first jet pump 22, for controlling the flow of the refrigerant in the first transfer unit 20 between the first pipe 91, the second pipe 92 and the first jet pump 22, and the direction in which the first check valve 23 and the second check valve 24 are disposed is opposite.
Still further, the first indoor unit 30 is provided with the second heat exchanger 31, the second indoor unit 50 is provided with the third heat exchanger 51, the first indoor expansion valve 32 is provided in the second pipe 92 connected to the second heat exchanger 31, and the second indoor expansion valve 52 is provided in the fourth pipe 94 connected to the third heat exchanger 51.
Preferably, the structures and connection relationships of the second indoor unit 50 and the second transfer unit 40 with the first indoor unit 30 and the first transfer unit 20 are identical, and will not be described in detail herein.
Preferably, when the first indoor unit 30 and the second indoor unit 50 are simultaneously refrigerating, the outdoor unit 10 conveys a high-pressure liquid refrigerant to the first indoor unit 30 and the second indoor unit 50 through the liquid pipe 70, specifically, the high-pressure liquid refrigerant in the liquid pipe 70 is conveyed to the second pipe 92 and the fourth pipe 94 of the first transfer unit 20 and the second transfer unit 40, and then the high-pressure liquid refrigerant is converted into a low-temperature low-pressure two-phase refrigerant which is easy to evaporate by the first indoor expansion valve 32 and the second indoor expansion valve 52, wherein the low-pressure two-phase refrigerant comprises a low-pressure liquid refrigerant and a low-pressure gas refrigerant, and further, the low-pressure two-phase refrigerant is subjected to heat exchange by the second heat exchanger 31 and the third heat exchanger 51, so that the refrigerating effect of the first indoor unit 30 and the second indoor unit 50 is realized, the low-pressure refrigerant generated by the heat exchange of the second heat exchanger 31 and the third heat exchanger 51 is conveyed to the air pipe 60 by the first pipe 91 and the third pipe 93, and further, and the liquid refrigerant is conveyed to the outdoor unit 10, wherein the low-pressure two-phase refrigerant is in a high-pressure state, the high-pressure refrigerant is the low-pressure refrigerant, and the refrigerant is the high-pressure refrigerant.
Further, in the process of simultaneously cooling the first indoor unit 30 and the second indoor unit 50, the first solenoid valve 25 and the first expansion valve 27 in the first relay unit 20 are opened, the second expansion valve 28 and the second solenoid valve 26 are closed, and in the second relay unit 40, the third solenoid valve 45 and the third expansion valve 47 are opened, and the fourth solenoid valve 46 and the fourth expansion valve 48 are closed.
It can be understood that, in the process of simultaneously cooling the first indoor unit 30 and the second indoor unit 50, the operation states of the first indoor unit 30 and the second indoor unit 50 are identical, so that at this time, the ejector pumps and the gas-liquid separators in the first transfer unit 20 and the second transfer unit 40 do not have operation states, and in the process of simultaneously cooling, the operation process of the multi-split air conditioner 100 is identical to that of the prior art, and the detailed operation process is not described herein.
Preferably, the principles of simultaneous heating and simultaneous cooling of the first indoor unit 30 and the second indoor unit 50 are consistent, when the first indoor unit 30 and the second indoor unit 50 are simultaneously heated, the outdoor unit 10 delivers high-pressure gaseous refrigerant to the first indoor unit 30 and the second indoor unit 50 through the air pipe 60, specifically, the high-pressure gaseous refrigerant in the air pipe 60 is delivered to the first pipeline 91 and the third pipeline 93 of the first transfer unit 20 and the second transfer unit 40, then the heat exchange is completed through the second heat exchanger 31 and the third heat exchanger 51, after the heat exchange is completed, the generated high-pressure liquid refrigerant is delivered to the liquid pipe 70 through the second pipeline 92 and the fourth pipeline 94, and further delivered back to the outdoor unit 10 through the liquid pipe 70.
Further, during simultaneous heating and simultaneous cooling, except for the opposite gas-liquid flowing directions among the first indoor unit 30, the second indoor unit 50 and the outdoor unit 10, the closing states of the switches in the first transfer unit 20 and the second transfer unit 40 are also consistent with the simultaneous cooling condition, and will not be described in detail herein.
[ Second embodiment ]
Preferably, in the second embodiment of the present invention, in the multi-split air conditioner 100, the outdoor unit 10 is configured to separate the high-pressure refrigerant into the high-pressure gaseous refrigerant and the high-pressure liquid refrigerant by the gas-liquid separator in the main cooling mode, and if any one of the indoor units is in the heating mode, the high-pressure gaseous refrigerant is delivered to the indoor unit, and if any one of the indoor units is in the cooling mode, the high-pressure liquid refrigerant is delivered to the indoor unit. The liquid refrigerant in the indoor unit in the heating mode is supplied to the indoor unit in the cooling mode through the waste heat recovery pipe 80. The gas-liquid separator is arranged between the liquid pipe 70 and the indoor unit, the gas-liquid separator comprises an inlet, a gas outlet and an outlet, the outlet of the gas-liquid separator of the indoor unit in a refrigerating mode is communicated with the indoor unit refrigerant inlet, the gas outlet is communicated with the gas pipe 60, the gas outlet of the gas-liquid separator of the indoor unit in a heating mode is communicated with the indoor unit refrigerant inlet, the outlet is communicated with the indoor unit refrigerant inlet in the refrigerating mode through a waste heat recovery pipe 80, the inlet is communicated with the liquid pipe 70, and the refrigerant outlet of the indoor unit in the heating mode is communicated with the indoor unit refrigerant inlet in the refrigerating mode through the waste heat recovery pipe 80.
The main cooling mode means that when the multi-split air conditioner 100 is operated simultaneously with cooling and heating, referring to fig. 4 as an example, the cooling requirement of the first indoor unit 30 is relatively high, and the heating requirement of the second indoor unit 50 is relatively low, at this time, the multi-split air conditioner 100 is mainly cooled, that is, the operation state of the multi-split air conditioner 100 can be recorded as the main cooling mode, and the outdoor unit 10 is heated in this state, it is understood that in the main cooling mode, the second indoor unit 50 can be regarded as the second outdoor unit of the first indoor unit 30, and the high-pressure liquid refrigerant delivered to the first indoor unit 30 by the liquid pipe 70 and the waste heat recovery pipe 80 through the cooperation between the second indoor unit 50 and the outdoor unit 10, so that the cooling efficiency of the first indoor unit 30 is improved, and the requirement of a user for cooling in the main cooling mode is further satisfied.
Further, when the indoor units and the relay units are two, the multi-split air conditioner 100 performs cooling and heating simultaneously, and the outdoor unit 10 is in the main cooling mode, the first indoor unit 30 is cooled and the second indoor unit 50 is heated for example;
Referring to fig. 4, in the cooling mode, by suppressing the fan air volume of the first heat exchanger 14 in the outdoor unit 10, a high-pressure two-phase refrigerant, that is, a high-pressure gaseous refrigerant and a high-pressure liquid refrigerant, are generated in the piping of the outdoor unit 10, and the high-pressure two-phase refrigerant is delivered to the first gas-liquid separator 21 through the liquid pipe 70 by the second pipe 92, is delivered to the first indoor unit 30 through the first gas-liquid separator 21 after being subjected to gas-liquid separation, is subjected to depressurization by the first indoor expansion valve 32 after being subjected to pressure reduction treatment, and is delivered to the second heat exchanger 31, so that the purpose of cooling the first indoor unit 30 is achieved, and the low-pressure gaseous refrigerant further subjected to heat exchange by the second heat exchanger 31 is delivered to the air pipe 60 through the first pipe 91 and is finally delivered back to the inside of the outdoor unit 10, so that a cycle is formed.
Further, in the process of refrigerating the first indoor unit 30, the first electromagnetic valve 25 in the first transfer unit 20 is in an open state, the second electromagnetic valve 26 is in a closed state, the first expansion valve 27 is in an open state, the second expansion valve 28 is in an open state, and the valve opening of the second expansion valve 28 is adjusted to be smaller, so that the pressure of the high-pressure gaseous refrigerant flowing from the first gas-liquid separator 21 to the first pipeline 91 can be reduced, and the high-pressure gaseous refrigerant is further mixed with the low-pressure gaseous refrigerant in the first pipeline 91 and then is conveyed to the outdoor unit 10 together by the air pipe 60.
Preferably, when the second indoor unit 50 heats, the high-pressure two-phase refrigerant in the liquid pipe 70 is conveyed to the second gas-liquid separator 41 through the fourth pipe 94, then is subjected to gas-liquid separation, the high-pressure gaseous refrigerant is conveyed to the third pipe 93 through the fourth expansion valve 48, further is conveyed to the second indoor unit 50 for heat exchange, and is formed into a high-pressure liquid refrigerant after heat exchange through the third heat exchanger 51, in order to ensure full utilization of the high-pressure liquid refrigerant in the second indoor unit 50, the high-pressure liquid refrigerant can be conveyed to the first indoor unit 30 through the waste heat recovery pipe 80, further is subjected to refrigeration treatment by the first indoor unit 30, and the high-pressure liquid refrigerant separated by the second gas-liquid separator 41 can be conveyed to the waste heat recovery pipe 80 through the third expansion valve 47, is mixed with the high-pressure liquid refrigerant generated by the second indoor unit 50 and then is conveyed to the first indoor unit 30, and waste of the high-pressure liquid refrigerant generated during the heating of the second indoor unit 50 is avoided.
Further, in the process of heating the second indoor unit 50, the third electromagnetic valve 45 and the fourth electromagnetic valve 46 are in a closed state, the fourth expansion valve 48 is in a fully opened state, and in order to avoid the influence of the high-pressure liquid refrigerant separated by the second gas-liquid separator 41 on the heating of the second indoor unit 50, the opening of the third expansion valve 47 is adjusted to be smaller.
Preferably, in one case, when the cooling is in the main mode, the first gas-liquid separator 21 and the second gas-liquid separator 41 in the first relay unit 20 and the second relay unit 40 may be omitted when the heating requirement is relatively low. The high-pressure liquid refrigerant (for example, condensation temperature 50 ℃) from the outdoor unit 10 may flow into the first indoor unit 30 and the second indoor unit 50, and only sensible heat is used for heating, that is, when the second indoor unit 50 heats, the temperature of the high-pressure liquid refrigerant is used for heating, and in this process, the refrigerant state does not undergo phase change.
[ Third embodiment ]
Preferably, in the third embodiment of the present invention, each of the transfer units includes a jet pump, and when the outdoor unit 10 is in the heating mode, if any of the indoor units is in the heating mode, a high-pressure gaseous refrigerant is delivered to the outdoor unit, and part of the high-pressure liquid refrigerant passing through the indoor units is delivered to the liquid pipe, and the other part of the high-pressure liquid refrigerant is delivered to the transfer unit of the indoor unit in the cooling mode through the waste heat recovery pipe 80. The waste heat recovery pipe 80 is used for conveying a part of high-pressure liquid refrigerant into the transfer unit of the indoor unit in the refrigerating mode to the indoor unit in the refrigerating mode, and the other part of high-pressure liquid refrigerant is conveyed into the jet pump, wherein the high-pressure liquid refrigerant conveyed into the jet pump is used for guiding low-pressure gas refrigerant generated by the indoor unit in the refrigerating mode. The outdoor unit 10 is in a heating mode, the refrigerant outlet of the indoor unit in the heating mode is communicated with the inlet of the gas-liquid separator, the refrigerant outlet of the indoor unit in the cooling mode is communicated with the inlet through the jet pump, and the outlet of the gas-liquid separator is communicated with the liquid pipe. The ejector pump is provided with a driving inflow port, a suction inflow port, and an ejector pump outlet, wherein the refrigerant outlet of the indoor unit in a cooling mode is communicated with the suction inflow port in a heating main mode of the outdoor unit 10, the driving inflow port is communicated with the waste heat recovery pipe 80, and the ejector pump outlet is communicated with the inlet of the gas-liquid separator.
The heating is a main mode, which means that when the multi-split air conditioner 100 is operated simultaneously with cooling and heating, referring to fig. 5, the heating requirement of the first indoor unit 30 is relatively large, and the cooling requirement of the second indoor unit 50 is relatively small, at this time, the multi-split air conditioner 100 is mainly heated, that is, the operation state of the multi-split air conditioner 100 can be recorded as the heating is the main mode, and in this state, the outdoor unit 10 is cooled, and it can be understood that in the heating is the main mode, the requirement of the user for cooling is relatively low, the first indoor unit 30 can be regarded as the outdoor unit of the second indoor unit 50, the first indoor unit 30 can provide the high-pressure liquid refrigerant required by the second indoor unit 50, and at this time, the waste heat recovery pipe 80 mainly plays a role of conveying the high-pressure liquid refrigerant to the second indoor unit 50.
Further, referring to fig. 5, when the indoor units and the transfer unit are in the main mode, the first indoor unit 30 is used for heating, the second indoor unit 50 is used for cooling, for example, the outdoor unit 10 transfers the high-pressure gaseous refrigerant to the first indoor unit 30 through the air pipe 60, after the heat exchange is formed between the second heat exchanger 31 and the indoor air, the high-pressure liquid refrigerant is formed, wherein a part of the generated high-pressure liquid refrigerant is transferred to the liquid pipe 70 through the first expansion valve 27 through the second pipe 92 and then is transferred to the outdoor unit 10 through the liquid pipe 70 to form a circulation, another part of the generated high-pressure liquid refrigerant is transferred to the second transfer unit 40 through the waste heat recovery pipe 80 through the second pipe 92, and after the pressure is reduced through the second indoor expansion valve 52, the high-pressure gaseous refrigerant is transferred to the first indoor unit 30 through the third pipe 93, and then sequentially passes through the third check valve 43, the second jet pump 42, the fourth electromagnetic valve 46, the second gas-liquid separator 41 and the liquid pipe 70 to complete the circulation in the outdoor unit 10, and simultaneously the second liquid refrigerant is transferred to the fourth electromagnetic valve 46 through the second pipe 44 and the second check valve 44.
Further, during the heating process of the first indoor unit 30, the first electromagnetic valve 25 in the first transfer unit 20 is in an open state, the second electromagnetic valve 26 is in a closed state, the first expansion valve 27 is in an open state, the opening of the first expansion valve 27 is smaller, and the second expansion valve 28 is in a closed state.
Still further, during the cooling process of the second indoor unit 50, the third electromagnetic valve 45 is in a closed state, the fourth electromagnetic valve 46 is in an open state, and the third expansion valve 47 and the fourth expansion valve 48 are in a closed state.
Preferably, when the heating is in the main mode, the high-pressure liquid refrigerant fed in the second relay unit is mostly distributed to the second ejector 42 side as a driving flow of the refrigerant fed to the second indoor unit 50. The refrigerant sent to the second indoor unit 50 is boosted in pressure from evaporation by the second ejector pump 42, and then returned to the outdoor unit 10 through the liquid pipe 70. The second expansion valve 28 in the first relay unit 20 for heating is adjusted to be fully closed in order to allow the return liquid refrigerant to flow into the second relay unit 40 on the cooling side, but the opening degree thereof needs to be adjusted according to the ratio of cooling (when the pressure loss of the third pipe 93 and the fourth pipe 94 for cooling is excessive, etc.).
Preferably, referring to fig. 6, when the heating is in the main mode, the second indoor unit 50 cools, the high-pressure liquid refrigerant flowing from the fourth check valve 44 to the second ejector 42 is ejected at a high speed from the nozzle as a driving flow, a low-pressure space is formed inside, the low-pressure gaseous refrigerant flowing from the third check valve 43 to the second ejector 42 outside is sucked into the second ejector 42 as a suction flow, the mixed fluid is mixed in the mixing portion 421 in the second ejector 42, the speed of the mixed fluid is reduced in the diffuser, and the kinetic energy of the mixed fluid is recovered almost without damage, thereby achieving the purpose of recovering the pressure.
Wherein, P H is the initial pressure value when the high-pressure liquid refrigerant as the driving flow enters the second ejector pump 42, P L is the initial pressure value when the low-pressure gas refrigerant as the suction flow enters the second ejector pump 42, P S is the minimum pressure value reached after the driving flow and the suction flow are mixed, and P D is the pressure value of the mixed fluid at the outlet of the second ejector pump 42.
Further, the mixed fluid is conveyed to the gas chamber 411 and the liquid chamber 412 in the second gas-liquid separator 41, at this time, because the fourth expansion valve 48 is in a closed state, the separated gaseous refrigerant does not enter the air pipe 60 from the fourth expansion valve 48, at this time, the second gas-liquid separator 41 can be used as a storage, when the low-pressure gaseous refrigerant and the high-pressure liquid refrigerant in the second jet pump 42 cannot be sufficiently mixed, the mixed fluid can be further buffered in the second gas-liquid separator 41, and finally the final mixed fluid is conveyed to the liquid pipe 70 and further conveyed to the outdoor unit 10 for circulation, it can be understood that the mixed fluid mainly contains high-pressure liquid, a small amount of gas is mixed in the mixed fluid, the mixed fluid in the second gas-liquid separator 41 can be further separated by adding a pipe, and then the mixed fluid in the second gas-liquid separator 41 can be conveyed to the second compressor 422 and the condenser 423 by a newly arranged pipe for heating or the evaporator for cooling purposes, and the heating process or the heating process is not consistent with the prior art.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (8)
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| JP3918421B2 (en) * | 2000-09-21 | 2007-05-23 | 三菱電機株式会社 | Air conditioner, operation method of air conditioner |
| JP4800834B2 (en) * | 2006-04-28 | 2011-10-26 | 東芝キヤリア株式会社 | Air conditioner indoor unit |
| CN102072531B (en) * | 2010-12-29 | 2012-11-07 | 广东美的电器股份有限公司 | Four-pipe type heat recovery multi-split air conditioning system |
| CN112032825A (en) * | 2020-08-13 | 2020-12-04 | 青岛海尔空调电子有限公司 | Air conditioning system and compressor waste heat recovery method thereof |
| CN112178969A (en) * | 2020-10-28 | 2021-01-05 | 珠海格力电器股份有限公司 | Multi-line system and its control method |
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| CN104833010A (en) * | 2015-05-25 | 2015-08-12 | 广东美的暖通设备有限公司 | Outdoor unit of heat recovery VRF air conditioning system and heat recovery VRF air conditioning system |
| CN106247508A (en) * | 2016-09-12 | 2016-12-21 | 青岛海信日立空调系统有限公司 | Use the air conditioner heat pump system of ejector, air-conditioner and air-conditioner control method |
| CN110779080A (en) * | 2019-10-10 | 2020-02-11 | 珠海格力电器股份有限公司 | Continuous heating heat recovery air conditioner outdoor system, heat recovery air conditioner and using method thereof |
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