CN107975959B - Multi-split air conditioning system and control method - Google Patents
Multi-split air conditioning system and control method Download PDFInfo
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- CN107975959B CN107975959B CN201711088867.7A CN201711088867A CN107975959B CN 107975959 B CN107975959 B CN 107975959B CN 201711088867 A CN201711088867 A CN 201711088867A CN 107975959 B CN107975959 B CN 107975959B
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- valve
- pipeline
- enthalpy
- compressor
- supercooling
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a multi-split air conditioning system which comprises a compressor, a four-way valve, an outdoor heat exchanger, a heat exchange device, an electronic expansion valve, a supercooling valve, an enthalpy-increasing valve and a control device, wherein the control device controls the opening of the electronic expansion valve and the supercooling valve, so that sealing pressure is formed between the enthalpy-increasing valve and a one-way valve. The invention also discloses a control method. The multi-split air conditioning system and the control method can prevent the frequent jacking of the enthalpy-spraying valve caused by the pulsation of the enthalpy-spraying port of the compressor, further reduce abnormal sound generated by the enthalpy-spraying valve, and are reasonable in structure, convenient and practical.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioning system and a control method.
Background
The existing multi-connected air conditioning unit is called multi-connected air conditioning unit for short, wherein the household multi-connected air conditioning unit is simple in structure, and comprises only one outdoor unit and a few indoor units, and the outdoor unit is communicated with the indoor units after being connected in parallel.
The household multi-split air conditioner comprises a compressor, four-way reversing valves, an outdoor heat exchanger (a condenser in refrigeration), a plurality of electronic expansion valves and a plurality of indoor heat exchangers (evaporators in refrigeration) the number of which is the same as that of the electronic expansion valves. The compressor, the four-way reversing valve, the outdoor heat exchanger and the electronic expansion valve belong to an outdoor unit part, and the indoor heat exchanger belongs to an indoor unit part. In the refrigeration mode, the first valve port and the second valve port of the four-way reversing valve are communicated, and the third valve port and the fourth valve port are communicated, namely, the refrigerant circulates along the route of the compressor, the outdoor heat exchanger, the indoor heat exchanger and the compressor; in the heating mode, a first valve port of the four-way reversing valve is communicated with a third valve port, a second valve port of the four-way reversing valve is communicated with a fourth valve port, and a refrigerant circulates along a route of the compressor, the indoor heat exchanger, the outdoor heat exchanger and the compressor.
In the refrigeration mode, the conditions that the heat dissipation of the coil pipe of the outdoor heat exchanger is difficult and the cold absorption capacity of the outdoor heat exchanger from the outside is insufficient due to the overhigh outdoor environment temperature can occur, at this time, a plate heat exchanger and a supercooling branch pipeline with a supercooling electronic expansion valve are additionally arranged for each outdoor unit, the outdoor unit is originally provided with an initial pipeline which is connected with a refrigerant circulation main pipe from the outlet of the external electronic expansion valve, the initial pipeline enters from a first port of the plate heat exchanger and is led out from a second port, the inlet of the supercooling branch pipeline is also connected with the outlet of the external electronic expansion valve, the outlet of the supercooling branch pipeline is connected with the gas-liquid separator, and the supercooling branch pipeline enters from the second port of the plate heat exchanger and is led out from the first port. Therefore, only the supercooling electronic expansion valve needs to be opened, the refrigerant flows out from the external machine electronic expansion valve and is divided into two streams, the first stream of refrigerant flows to the indoor machine through the initial pipeline and the plate heat exchanger, the second stream of refrigerant flows back to the compressor through the supercooling branch pipeline and the plate heat exchanger, the two streams of convection refrigerant perform secondary heat exchange in the plate heat exchanger, the second stream of refrigerant absorbs heat and gasifies back to the compressor, and the first stream of refrigerant releases heat and liquefies to flow to the indoor machine, so that more cold energy is provided for the indoor machine. However, when the supercooling electronic expansion valve is opened during refrigeration operation, pulsation of the enthalpy injection port of the compressor easily causes frequent ejection of the enthalpy injection solenoid valve at the enthalpy injection port, and abnormal sound is generated.
Disclosure of Invention
In view of the above, the present invention aims to provide a multi-split air conditioning system, which can prevent the enthalpy-increasing valve from frequently pushing open, and further slow down abnormal sound of the enthalpy-increasing valve.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows: the utility model provides a many online air conditioning system, includes compressor, cross valve, outdoor heat exchanger and heat transfer device, the exit end of outdoor heat exchanger pass through electronic expansion valve with heat transfer device is connected, heat transfer device can flow back to the compressor through first pipeline, be connected with parallelly connected supercooling pipeline and enthalpy adding pipeline between first pipeline and the compressor, supercooling pipeline is connected to the air inlet end of compressor; the heat exchange device comprises a heat exchange device, an enthalpy increasing pipeline, a supercooling pipeline, a check valve, an electronic expansion valve, a control device and an air conditioning system, wherein the enthalpy increasing pipeline is connected to an enthalpy spraying port of the compressor, the supercooling pipeline is provided with the supercooling valve, the enthalpy increasing pipeline is provided with the enthalpy increasing valve, the enthalpy increasing pipeline is further provided with the check valve which only allows a refrigerant to flow from the direction of the heat exchange device to the direction of the compressor, the enthalpy increasing valve is arranged between the check valve and the enthalpy spraying port of the compressor, and the air conditioning system further comprises the control device for controlling the electronic expansion valve and the supercooling valve to be opened or closed.
Furthermore, an unloading bypass is connected in parallel between the discharge end of the supercooling pipeline and the enthalpy-spraying port of the compressor, a first end of the unloading bypass is arranged between the one-way valve and the enthalpy-increasing valve, a second end of the unloading bypass is connected with the discharge end of the supercooling pipeline, and the unloading bypass is connected with the unloading valve. In this way, the explosion of the tube due to the excessively high sealing pressure can be avoided, and the compressor can be protected.
Further, the device also comprises a gas-liquid separator, wherein the inlet end of the gas-liquid separator is connected with the discharge end of the supercooling pipeline, and the outlet end of the gas-liquid separator is connected with the air inlet end of the compressor. In this way, the refrigerant can be subjected to gas-liquid separation, thereby obtaining a gaseous refrigerant gas.
Further, the oil separator comprises an inlet end, a first outlet end and a second outlet end, wherein the inlet end of the oil separator is connected with the exhaust port end of the compressor, the first outlet end is connected with the four-way valve, and the second outlet end is connected to the air inlet end of the compressor through a capillary tube. Thus, the refrigerant can be separated into oil and gas.
Further, a high-pressure sensor is arranged on a connecting pipeline between the first outlet end of the oil separator and the four-way valve, and a low-pressure sensor is arranged on a connecting pipeline between the outlet end of the gas-liquid separator and the air inlet end of the compressor.
Further, an expansion valve is arranged on a second pipeline between the outdoor heat exchanger and the heat exchange device, the refrigerant passes through the heat exchange device and is divided into two paths, one path is connected with an indoor unit of the air conditioner, and the other path is connected with the first pipeline after passing through the electronic expansion valve and the heat exchange device in sequence.
Further, the heat exchange device is a plate heat exchanger.
Further, the outdoor heat exchanger is a fin heat exchanger.
The multi-split air conditioning system can enable the sealing pressure to be formed between the check valve and the enthalpy-spraying valve, so that the frequent jacking of the enthalpy-spraying valve caused by pulsation of the enthalpy-spraying port of the compressor is prevented, abnormal sound generated by the enthalpy-spraying valve is further relieved, and the multi-split air conditioning system is reasonable in structure, convenient and practical.
The invention further aims to provide a control method of the multi-split air conditioner, which can improve abnormal sound of the enthalpy injection electromagnetic valve.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows: according to the control method of the multi-split air conditioning system, the enthalpy-increasing valve is in a closed state in a refrigeration mode, and the control device controls the electronic expansion valve to be opened t seconds later and controls the supercooling valve to be opened, so that sealing pressure is formed between the enthalpy-increasing valve and the one-way valve.
Further, t is 2s to 5s.
Compared with the prior art, the control method of the multi-split air conditioning system has the following advantages:
the control method of the multi-split air conditioning system can enable the sealing pressure to be formed between the check valve and the enthalpy-spraying valve, thereby preventing the frequent ejection of the enthalpy-spraying valve caused by the pulsation of the enthalpy-spraying port of the compressor, further reducing the abnormal sound generated by the enthalpy-spraying valve, and being reasonable in structure, convenient and practical.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic control diagram of a multi-split air conditioning system according to an embodiment of the present invention.
Reference numerals illustrate:
1-compressor, 11-air inlet end, 12-enthalpy injection port, 13-air outlet end, 2-four-way valve, 3-outdoor heat exchanger, 31-expansion valve, 4-heat exchange device, 41-first pipeline, 42-electronic expansion valve, 5-supercooling pipeline, 51-supercooling valve, 6-enthalpy increasing pipeline, 61-enthalpy increasing valve, 62-check valve, 7-gas-liquid separator, 71-low pressure sensor, 8-oil separator, 81-high pressure sensor, 82-capillary, 9-unloading bypass and 91-unloading valve.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the multi-split air conditioning system according to the embodiment of the invention includes a compressor 1, an oil separator 8, a four-way valve 2, an outdoor heat exchanger 3, a heat exchange device 4 and a gas-liquid separator 7, wherein the number of the compressors 1 is two, the outlet ends of the outdoor heat exchanger 3 sequentially pass through the heat exchange device 4 and an electronic expansion valve 42, then pass through the heat exchange device 4, and then can flow back to the compressor 1 through a first pipeline 41, specifically, an expansion valve 31 is arranged on a second pipeline between the outdoor heat exchanger 3 and the heat exchange device 4, the refrigerant is divided into two paths by the heat exchange device 4, one path is connected with an indoor unit (not shown) of the air conditioner, and the other path is sequentially connected with the first pipeline 41 after passing through the electronic expansion valve 42 and the heat exchange device 4. In addition, in the present embodiment, the heat exchanging device 4 is a plate heat exchanger; the outdoor heat exchanger 3 is a fin heat exchanger, and the electronic expansion valve 42 may be a supercooling electronic expansion valve or an enthalpy injection electronic expansion valve.
In the present embodiment, a supercooling pipeline 5 and an enthalpy increasing pipeline 6 which are connected in parallel are connected between the first pipeline 41 and the compressor 1, and the supercooling pipeline 5 is connected to the air inlet end 11 of the compressor 1; the enthalpy-increasing pipeline 6 is connected to the enthalpy-spraying port 12 of the compressor 1, the supercooling pipeline 5 is provided with the supercooling valve 51, the enthalpy-increasing pipeline 6 is provided with the enthalpy-increasing valve 61, the enthalpy-increasing pipeline 6 is also provided with the one-way valve 62 which only allows the refrigerant to flow from the direction of the heat exchange device 4 to the direction of the compressor 1, the enthalpy-increasing valve 61 is arranged between the one-way valve 62 and the enthalpy-spraying port 12 of the compressor 1, the air conditioning system further comprises a control device which controls the opening or closing of the electronic expansion valve 42, the supercooling valve 51 and the enthalpy-increasing valve 61, and the control device controls the opening of the electronic expansion valve 42 and the supercooling valve 51, so that sealing pressure is formed between the enthalpy-increasing valve 61 and the one-way valve 62, thereby preventing frequent ejection of the enthalpy-spraying valve caused by pulsation of the enthalpy-spraying port of the compressor, further slowing down abnormal sound generated by the enthalpy-spraying valve, and the air conditioning system is reasonable in structure, convenient and practical.
In order to avoid pipe bursting due to too high sealing pressure, in this embodiment, an unloading bypass 9 is further connected in parallel between the discharge end of the supercooling pipeline 5 and the enthalpy injection port 12 of the compressor 1, a first end of the unloading bypass 9 is disposed between the check valve 62 and the enthalpy increasing valve 61, a second end of the unloading bypass 9 is connected with the discharge end of the supercooling pipeline 5, and an unloading valve 91 is connected to the unloading bypass 9.
In this embodiment, the inlet end of the gas-liquid separator 7 is connected to the discharge end of the supercooling pipeline 5, and the outlet end of the gas-liquid separator 7 is connected to the inlet end 11 of the compressor 1; the oil separator 8 comprises an inlet end, a first outlet end and a second outlet end, the inlet end of the oil separator 8 is connected with the exhaust port end 13 of the compressor 1, a first one-way valve and a high-pressure switch are arranged on a connecting pipeline between the oil separator 8 and the exhaust port end 13 of the compressor 1, the first one-way valve only allows refrigerant to flow from the direction of the exhaust port end 13 of the compressor 1 to the direction of the oil separator 8, the first outlet end is connected with the four-way valve 2, and the second outlet end is connected to the air inlet end 11 of the compressor 1 through a capillary tube 82. Wherein, a high pressure sensor 81 is arranged on a connecting pipeline between the first outlet end of the oil separator 8 and the four-way valve 2, and a low pressure sensor 71 is arranged on a connecting pipeline between the outlet end of the gas-liquid separator 7 and the air inlet end 11 of the compressor 1.
In the control method using the multi-split air conditioning system, in the refrigeration mode, the enthalpy-increasing valve 61 is in a closed state, and after the control device controls the electronic expansion valve 42 to be opened t, wherein the value of t is 2 s-5 s, and then controls the supercooling valve 51 to be opened, so that sealing pressure is formed between the enthalpy-increasing valve 61 and the check valve 62, and abnormal noise generated by the enthalpy-spraying valve is relieved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The utility model provides a many online air conditioning system, includes compressor (1), cross valve (2), outdoor heat exchanger (3) and heat transfer device (4), the exit end of outdoor heat exchanger (3) pass through electronic expansion valve (42) with heat transfer device (4) are connected, just heat transfer device (4) can flow back to through first pipeline (41) compressor (1), be provided with expansion valve (31) on outdoor heat exchanger (3) with the second pipeline between heat transfer device (4), the refrigerant is passed through heat transfer device (4) divide two ways, one way with the indoor set of air conditioner is connected, another way is passed through in proper order behind electronic expansion valve (42), heat transfer device (4) with first pipeline (41) are connected, its characterized in that: a supercooling pipeline (5) and an enthalpy increasing pipeline (6) which are connected in parallel are connected between the first pipeline (41) and the compressor (1), and the supercooling pipeline (5) is connected to an air inlet end (11) of the compressor (1); the utility model provides an increase enthalpy pipeline (6) is connected to spout enthalpy mouth (12) of compressor (1), be provided with on supercooling pipeline (5) and cross cold valve (51), be provided with on increasing enthalpy pipeline (6) and increase enthalpy valve (61), still be provided with on increasing enthalpy pipeline (6) and only allow refrigerant from heat transfer device (4) direction flow to check valve (62) of compressor (1) direction, increase enthalpy valve (61) set up check valve (62) with between spouting enthalpy mouth (12) of compressor (1), still parallelly connected between the discharge end of supercooling pipeline (5) with spout enthalpy mouth (12) of compressor (1) and have unloading bypass (9), the first end of unloading bypass (9) sets up between check valve (62) and increase enthalpy valve (61), the second end of unloading bypass (9) with the discharge end of supercooling pipeline (5) is connected, be connected with unloading valve (91) on unloading bypass (9), still include in the supercooling control system and open or close air conditioning system expansion valve (42) or expansion valve (51).
2. The multi-split air conditioning system of claim 1, wherein: the air-cooling device is characterized by further comprising a gas-liquid separator (7), wherein the inlet end of the gas-liquid separator (7) is connected with the discharge end of the supercooling pipeline (5), and the outlet end of the gas-liquid separator (7) is connected with the air inlet end (11) of the compressor (1).
3. The multi-split air conditioning system of claim 2, wherein: the oil separator (8) comprises an inlet end, a first outlet end and a second outlet end, the inlet end of the oil separator (8) is connected with an exhaust port end (13) of the compressor (1), the first outlet end is connected with the four-way valve (2), and the second outlet end is connected to an air inlet end (11) of the compressor (1) through a capillary tube (82).
4. The multi-split air conditioning system of claim 3, wherein: a high-pressure sensor (81) is arranged on a connecting pipeline between the first outlet end of the oil separator (8) and the four-way valve (2), and a low-pressure sensor (71) is arranged on a connecting pipeline between the outlet end of the gas-liquid separator (7) and the air inlet end (11) of the compressor (1).
5. The multi-split air conditioning system according to any one of claims 1 to 4, wherein: the heat exchange device (4) is a plate heat exchanger.
6. The multi-split air conditioning system of claim 5, wherein: the outdoor heat exchanger (3) is a fin heat exchanger.
7. A control method using the multi-split air conditioning system according to any one of claims 1 to 6, characterized in that: in the refrigeration mode, the enthalpy-increasing valve (61) is in a closed state, and the control device controls the electronic expansion valve (42) to be opened for t seconds and then controls the supercooling valve (51) to be opened, so that sealing pressure is formed between the enthalpy-increasing valve (61) and the check valve (62).
8. The control method according to claim 7, characterized in that: t is 2 s-5 s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711088867.7A CN107975959B (en) | 2017-11-08 | 2017-11-08 | Multi-split air conditioning system and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711088867.7A CN107975959B (en) | 2017-11-08 | 2017-11-08 | Multi-split air conditioning system and control method |
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| CN107975959A CN107975959A (en) | 2018-05-01 |
| CN107975959B true CN107975959B (en) | 2023-09-22 |
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| CN201711088867.7A Active CN107975959B (en) | 2017-11-08 | 2017-11-08 | Multi-split air conditioning system and control method |
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| CN109682106B (en) * | 2019-02-12 | 2024-01-23 | 珠海格力电器股份有限公司 | Refrigerant circulation system for slowing down surge of compressor, control method thereof and air conditioner |
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| WO2016155370A1 (en) * | 2015-03-31 | 2016-10-06 | 广东美的暖通设备有限公司 | Variable refrigerant flow system |
| WO2017008554A1 (en) * | 2015-07-16 | 2017-01-19 | 广东美的暖通设备有限公司 | Multi-split system and control method for electronic expansion valve thereof |
| CN106500391A (en) * | 2016-10-18 | 2017-03-15 | 青岛海信日立空调系统有限公司 | A kind of recuperated cycle system and its control method and air-conditioning |
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| JPH06147690A (en) * | 1992-11-12 | 1994-05-27 | Zexel Corp | Air conditioning apparatus |
| JPH10185343A (en) * | 1996-12-24 | 1998-07-14 | Daikin Ind Ltd | Refrigerating equipment |
| CN1285907A (en) * | 1997-11-17 | 2001-02-28 | 大金工业株式会社 | Refrigerating apparatus |
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