CN114963603A - System for preventing liquid return during multi-split air conditioner starting and control method - Google Patents
System for preventing liquid return during multi-split air conditioner starting and control method Download PDFInfo
- Publication number
- CN114963603A CN114963603A CN202210609472.1A CN202210609472A CN114963603A CN 114963603 A CN114963603 A CN 114963603A CN 202210609472 A CN202210609472 A CN 202210609472A CN 114963603 A CN114963603 A CN 114963603A
- Authority
- CN
- China
- Prior art keywords
- liquid
- electronic expansion
- expansion valve
- indoor unit
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000004781 supercooling Methods 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 abstract description 8
- 239000003507 refrigerant Substances 0.000 description 10
- 238000005057 refrigeration Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003434 inspiratory effect Effects 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F24F11/67—Switching between heating and cooling modes
-
- 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
- F25B31/00—Compressor 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
-
- 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
-
- 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 discloses a system for preventing multiple on-line machines from starting to return liquid and a control method, and belongs to the technical field of multiple on-line air-conditioning systems. The system for preventing the liquid return from being started by the multi-online machine comprises an outdoor machine and a plurality of indoor machines; in a refrigerating state, an air outlet of the indoor unit is connected with an air inlet of the gas-liquid separator through the four-way valve, and an air outlet of the oil separator is connected with an air inlet of the heat exchanger of the outdoor unit through the four-way valve; in a heating state, an air outlet of the indoor unit is connected with an air outlet of the oil separator through the four-way valve, and an air inlet of the gas-liquid separator is connected with an air inlet of the heat exchanger of the outdoor unit through the four-way valve. In addition, the invention also provides a control method for preventing the multi-split air conditioner from starting and returning liquid, and solves the technical problem that the liquid returning of a compressor is easily caused when an indoor unit is abnormally shut down and restarted in the prior art by providing a system and a control method for preventing the multi-split air conditioner from starting and returning liquid.
Description
Technical Field
The invention relates to a system for preventing liquid return during starting of a multi-split air conditioner and a control method, and belongs to the technical field of multi-split air conditioning systems.
Background
The multi-split air conditioning system has the characteristic of long pipeline, and the refrigerant amount in the whole multi-split air conditioning system is larger, so that the multi-split air conditioning system is more prone to the problem of liquid return than a conventional air conditioning system. The existing measures for preventing liquid return of the multi-split air conditioning system include designing a large-capacity gas-liquid separator, and recovering refrigerant in a pipeline into the gas-liquid separator of an outdoor unit through evacuation operation during shutdown. However, if the unit cannot perform evacuation operation when the indoor unit is abnormally stopped, such as a sudden power failure or a communication failure between the indoor unit and the outdoor unit, a large amount of refrigerant is temporarily stored in the heat exchanger of the indoor unit and the pipe connecting the outlet of the heat exchanger of the indoor unit, and the amount of stored refrigerant is large because the pipe diameter of the pipe connecting the outlet of the heat exchanger of the indoor unit is large. If the abnormal stop time is long enough, the refrigerant can be condensed into liquid, and when the refrigeration is started next time, a large amount of liquid refrigerant can return to the outdoor unit in a short time, which easily causes the liquid return of the compressor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a system and a control method for preventing multiple on-line machine starting liquid return, and solves the technical problem that liquid return of a compressor is easily caused when an indoor machine is abnormally shut down and restarted in the prior art.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
on one hand, the invention provides a system for preventing multiple on-line machine from starting liquid return, which comprises an outdoor machine and a plurality of indoor machines;
the outdoor unit comprises a gas-liquid separator, a compressor, an oil separator, a four-way valve, an outdoor unit heat exchanger, an outdoor unit fan motor, an outdoor unit electronic expansion valve, a supercooling electronic expansion valve and a supercooling liquid storage device; the air outlet of the gas-liquid separator is connected with the air inlet of the compressor, the air outlet of the compressor is connected with the air inlet of the oil separator, the oil outlet of the oil separator is connected with the air inlet of the gas-liquid separator, the outdoor unit fan motor is connected with the outdoor unit heat exchanger through a bracket, the liquid outlet of the outdoor unit heat exchanger is connected with the liquid inlet of the outdoor unit electronic expansion valve, the liquid outlet of the outdoor unit electronic expansion valve is respectively connected with the overcooling type liquid storage device and the liquid inlet of the overcooling electronic expansion valve, the liquid outlet of the supercooling liquid storage device is connected with the liquid inlet of the indoor unit, the liquid outlet of the supercooling electronic expansion valve is connected with the air inlet of the gas-liquid separator through the supercooling liquid storage device, and an air suction pressure sensor is arranged at an air inlet of the gas-liquid separator, and an exhaust pressure sensor is arranged between an air outlet of the compressor and an air inlet of the oil separator.
In a refrigerating state, an air outlet of the indoor unit is connected with an air inlet of the gas-liquid separator through the four-way valve, and an air outlet of the oil separator is connected with an air inlet of the heat exchanger of the outdoor unit through the four-way valve; in a heating state, an air outlet of the indoor unit is connected with an air outlet of the oil separator through the four-way valve, and an air inlet of the gas-liquid separator is connected with an air inlet of the heat exchanger of the outdoor unit through the four-way valve.
Furthermore, the indoor unit comprises an indoor unit electronic expansion valve, an indoor unit heat exchanger and an indoor unit fan motor; the fan motor of the indoor unit is connected with the heat exchanger of the indoor unit through a bracket, the liquid outlet of the overcooling type liquid accumulator is connected with the liquid inlet of the electronic expansion valve of the indoor unit, the liquid outlet of the electronic expansion valve of the indoor unit is connected with the liquid inlet of the heat exchanger of the indoor unit, and the air outlet of the heat exchanger of the indoor unit is connected with the air inlet of the gas-liquid separator through the four-way valve in a refrigerating state; and in a heating state, an air outlet of the heat exchanger of the indoor unit is connected with an air outlet of the oil separator through the four-way valve.
Further, the number of the indoor units is 2 to 64.
Further, the opening degrees of the outdoor electronic expansion valve, the supercooling electronic expansion valve and the indoor electronic expansion valve are 0 to 480 steps.
Further, the supercooled liquid reservoir may be replaced with a conventional economizer.
On the other hand, the invention also provides a control method for preventing the multi-split air conditioner from starting to return liquid, which comprises the following steps:
when the compressor is normally cooled and shut down, the electronic expansion valve of the indoor unit is closed to 60 steps, the electronic expansion valve of the outdoor unit and the supercooling electronic expansion valve are closed to 0 step, the compressor operates at a specified rotating speed, and when the suction pressure detected by the suction pressure sensor is reduced to 3Bar, the compressor is shut down;
when the compressor is abnormally shut down and restarted, the four-way valve is switched to a heating state, the electronic expansion valve of the indoor unit and the electronic expansion valve of the supercooling unit are opened to a specified opening degree, the electronic expansion valve of the outdoor unit is closed to 0 step, and the compressor operates at a specified rotating speed.
Compared with the prior art, the invention has the following beneficial effects:
when the compressor is normally used for refrigeration and shutdown, the electronic expansion valve of the indoor unit is closed to 60 steps, the electronic expansion valve of the outdoor unit and the supercooling electronic expansion valve are closed to 0 step, the compressor is operated at a specified rotating speed, when the suction pressure detected by the suction pressure sensor is reduced to 3Bar, the heat exchanger of the indoor unit and a refrigerant in a pipeline connected with an air outlet of the heat exchanger of the indoor unit are recovered to a gas-liquid separator, the compressor is stopped at the moment, and liquid return of the compressor can be effectively avoided when the next refrigeration is carried out;
the indoor unit is abnormally stopped, when the indoor unit is started again and restarted, the four-way valve is switched to a heating state, the electronic expansion valve and the supercooling electronic expansion valve of the indoor unit are opened to specified opening degrees, the electronic expansion valve of the outdoor unit is closed to 0 step, the compressor is operated at a specified rotating speed, so that the heat exchanger of the indoor unit and the refrigerant in the pipeline connected with the air outlet of the heat exchanger of the indoor unit reversely flow into the supercooling type liquid storage device and the gas-liquid separator, and when the next refrigeration is carried out, the liquid return of the compressor can be effectively avoided.
Drawings
Fig. 1 is a schematic structural diagram of a multiple split air conditioning system according to an embodiment of the present invention, in a cooling state;
fig. 2 is a schematic structural diagram of a system for preventing multiple on-line startup liquid return system from being heated according to an embodiment of the present invention;
FIG. 3 is a schematic view of the construction of the indoor unit of FIG. 1;
in the figure: 1. a super-cooled reservoir; 2. a sub-cooling electronic expansion valve; 3. an electronic expansion valve of the outdoor unit; 4. an outdoor unit fan motor; 5. an outdoor heat exchanger; 6. a four-way valve; 7. an oil separator; 8. an exhaust pressure sensor; 9. a compressor; 10. an outdoor unit; 11. a gas-liquid separator; 12. an inspiratory pressure sensor; 13. an indoor unit; 14. an indoor unit heat exchanger; 15. an electronic expansion valve of the indoor unit; 16. and an indoor unit fan motor.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
as shown in fig. 1 and fig. 2, a system for preventing multiple on-line machine from starting liquid return according to an embodiment of the present invention includes an outdoor unit 10 and a plurality of indoor units 13;
the number of the indoor units 13 is 2 to 64, and the outdoor unit 10 comprises a gas-liquid separator 11, a compressor 9, an oil separator 7, a four-way valve 6, an outdoor unit 10 heat exchanger 5, an outdoor unit 10 fan motor 4, an outdoor unit 10 electronic expansion valve 3, a supercooling electronic expansion valve 2 and a supercooling liquid accumulator 1;
specifically, an air outlet of a gas-liquid separator 11 is connected with an air inlet of a compressor 9 through a pipeline, an air outlet of the compressor 9 is connected with an air inlet of an oil separator 7 through a pipeline, an oil outlet of the oil separator 7 is connected with an air inlet of the gas-liquid separator 11 through a pipeline, a fan motor 4 of an outdoor unit 10 is fixedly connected with a heat exchanger of the outdoor unit 10 through a bracket, a liquid outlet of the heat exchanger of the outdoor unit 10 is connected with a liquid inlet of an electronic expansion valve 3 of the outdoor unit 10 through a pipeline, a liquid outlet of the electronic expansion valve 3 of the outdoor unit 10 is respectively connected with liquid inlets of a supercooling liquid storage device 1 and a supercooling electronic expansion valve 2 through pipelines, a liquid outlet of the supercooling liquid storage device 1 is connected with a liquid inlet of an indoor unit 13 through a pipeline, a liquid outlet of the supercooling electronic expansion valve 2 is connected with an air inlet of the gas-liquid separator 11 through a pipeline through the supercooling liquid storage device 1, and an air inlet of the gas-liquid separator 11 is provided with an air suction pressure sensor 12, an exhaust pressure sensor 8 is arranged in a pipeline connecting an air outlet of the compressor 9 and an air inlet of the oil separator 7. When the four-way valve 6 is switched to a cooling state, the air outlet of the indoor unit 13 is connected with the air inlet of the gas-liquid separator 11 through the four-way valve 6, and the air outlet of the oil separator 7 is connected with the air inlet of the heat exchanger 5 of the outdoor unit 10 through the four-way valve 6; when the four-way valve 6 is switched to the heating state, the air outlet of the indoor unit 13 is connected to the air outlet of the oil separator 7 via the four-way valve 6, and the air inlet of the gas-liquid separator 11 is connected to the air inlet of the heat exchanger 5 of the outdoor unit 10 via the four-way valve 6. The outlet of the indoor unit 13 is connected to the port C of the four-way valve 6, the inlet of the gas-liquid separator 11 is connected to the port S of the four-way valve 6, the outlet of the oil separator 7 is connected to the port D of the four-way valve 6, and the inlet of the heat exchanger 5 of the outdoor unit 10 is connected to the port E of the four-way valve 6.
As shown in fig. 3, the indoor unit 13 includes an indoor unit electronic expansion valve 15, an indoor unit heat exchanger 14, and an indoor unit fan motor 16; an indoor unit fan motor 16 is fixedly connected with an indoor unit heat exchanger 14 through a support, a liquid outlet of the supercooling type liquid storage device 1 is connected with a liquid inlet of an indoor unit electronic expansion valve 15 through a pipeline, a liquid outlet of the indoor unit electronic expansion valve 15 is connected with a liquid inlet of the indoor unit heat exchanger 14 through a pipeline, and when the four-way valve 6 is switched to a refrigerating state, an air outlet of the indoor unit heat exchanger 14 is connected with an air inlet of the gas-liquid separator 11 through the four-way valve 6; when the four-way valve 6 is switched to the heating state, the air outlet of the indoor-unit heat exchanger 14 is connected to the air outlet of the oil separator 7 via the four-way valve 6.
The opening degrees of the outdoor unit 10 electronic expansion valve 3, the subcooling electronic expansion valve 2, and the indoor unit electronic expansion valve 15 are 0 to 480 steps.
In one embodiment, the overcooled liquid reservoir 1 can be replaced by a conventional economizer, which has a slightly lower liquid storage capacity but similar effect to the overcooled liquid reservoir 1.
Example 2:
the invention also provides a control method for preventing the multi-split air conditioner from starting to return liquid, which comprises the following steps:
when the refrigeration is normally shut down, the electronic expansion valve 15 of the indoor unit is closed to 60 steps, the electronic expansion valve 3 and the supercooling electronic expansion valve 2 of the outdoor unit 10 are closed to 0 step, the compressor 9 operates at a specified rotating speed, and when the suction pressure detected by the suction pressure sensor 12 is reduced to 3Bar, the compressor 9 is shut down;
when the suction pressure detected by the suction pressure sensor 12 is reduced to 3Bar, the refrigerant in the indoor heat exchanger 14 and the pipeline connected with the air outlet of the indoor heat exchanger 14 is recovered to the gas-liquid separator 11, at the moment, the compressor 9 is stopped, and the liquid return of the compressor 9 can be effectively avoided when the next refrigeration is carried out.
In one embodiment, the compressor 9 is operated at 50RPS during normal refrigeration shutdown.
When the air conditioner is started again, the four-way valve 6 is switched to a heating state, the electronic expansion valve 15 and the supercooling electronic expansion valve 2 of the indoor unit are opened to specified opening degrees, the electronic expansion valve 3 of the outdoor unit 10 is closed to 0 step, the compressor 9 runs at a specified rotating speed, so that the refrigerant in the heat exchanger 14 of the indoor unit and the pipeline connected with the air outlet of the heat exchanger 14 of the indoor unit reversely flows into the supercooling type liquid storage device 1 and the gas-liquid separator 11, and liquid return of the compressor 9 can be effectively avoided when the air conditioner is cooled next time.
In one embodiment, during abnormal shutdown and restart, the electronic expansion valve 15 and the supercooling electronic expansion valve 2 of the indoor unit are opened to 100 steps, and the compressor 9 operates at a rotation speed of 50 RPS.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A liquid return system for preventing multi-online starting is characterized by comprising an outdoor unit and a plurality of indoor units;
the outdoor unit comprises a gas-liquid separator, a compressor, an oil separator, a four-way valve, an outdoor unit heat exchanger, an outdoor unit fan motor, an outdoor unit electronic expansion valve, a supercooling electronic expansion valve and a supercooling liquid storage device; the air outlet of the gas-liquid separator is connected with the air inlet of the compressor, the air outlet of the compressor is connected with the air inlet of the oil separator, the oil outlet of the oil separator is connected with the air inlet of the gas-liquid separator, the outdoor unit fan motor is connected with the outdoor unit heat exchanger through a bracket, the liquid outlet of the outdoor unit heat exchanger is connected with the liquid inlet of the outdoor unit electronic expansion valve, the liquid outlet of the outdoor unit electronic expansion valve is respectively connected with the overcooling type liquid storage device and the liquid inlet of the overcooling electronic expansion valve, the liquid outlet of the supercooling liquid reservoir is connected with the liquid inlet of the indoor unit, the liquid outlet of the supercooling electronic expansion valve is connected with the air inlet of the gas-liquid separator through the supercooling liquid reservoir, and an air suction pressure sensor is arranged at an air inlet of the gas-liquid separator, and an exhaust pressure sensor is arranged between an air outlet of the compressor and an air inlet of the oil separator.
2. In a refrigerating state, an air outlet of the indoor unit is connected with an air inlet of the gas-liquid separator through the four-way valve, and an air outlet of the oil separator is connected with an air inlet of the heat exchanger of the outdoor unit through the four-way valve; and in a heating state, an air outlet of the indoor unit is connected with an air outlet of the oil separator through the four-way valve, and an air inlet of the gas-liquid separator is connected with an air inlet of the outdoor unit heat exchanger through the four-way valve.
3. The system for preventing multiple on-line startup liquid return according to claim 1, wherein the indoor unit comprises an indoor unit electronic expansion valve, an indoor unit heat exchanger and an indoor unit fan motor; the fan motor of the indoor unit is connected with the heat exchanger of the indoor unit through a bracket, the liquid outlet of the overcooling type liquid accumulator is connected with the liquid inlet of the electronic expansion valve of the indoor unit, the liquid outlet of the electronic expansion valve of the indoor unit is connected with the liquid inlet of the heat exchanger of the indoor unit, and the air outlet of the heat exchanger of the indoor unit is connected with the air inlet of the gas-liquid separator through the four-way valve in a refrigerating state; and in a heating state, an air outlet of the heat exchanger of the indoor unit is connected with an air outlet of the oil separator through the four-way valve.
4. The system for preventing multiple on-line startup liquid return according to claim 1, wherein the number of the indoor units is 2 to 64.
5. The system of claim 1, wherein the opening degree of the outdoor electronic expansion valve, the sub-cooling electronic expansion valve and the indoor electronic expansion valve is 0 to 480 steps.
6. The system for preventing startup of multiple on-line liquid return according to claim 1, wherein the subcooled accumulator is replaceable with a conventional economizer.
7. A control method for preventing liquid return during multi-split air conditioner starting is characterized by comprising the following steps:
when the compressor is normally cooled and shut down, the electronic expansion valve of the indoor unit is closed to 60 steps, the electronic expansion valve of the outdoor unit and the supercooling electronic expansion valve are closed to 0 step, the compressor operates at a specified rotating speed, and when the suction pressure detected by the suction pressure sensor is reduced to 3Bar, the compressor is shut down;
when the compressor is abnormally shut down and restarted, the four-way valve is switched to a heating state, the electronic expansion valve of the indoor unit and the electronic expansion valve of the supercooling unit are opened to a specified opening degree, the electronic expansion valve of the outdoor unit is closed to 0 step, and the compressor operates at a specified rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609472.1A CN114963603A (en) | 2022-05-31 | 2022-05-31 | System for preventing liquid return during multi-split air conditioner starting and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609472.1A CN114963603A (en) | 2022-05-31 | 2022-05-31 | System for preventing liquid return during multi-split air conditioner starting and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114963603A true CN114963603A (en) | 2022-08-30 |
Family
ID=82971621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210609472.1A Pending CN114963603A (en) | 2022-05-31 | 2022-05-31 | System for preventing liquid return during multi-split air conditioner starting and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114963603A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH062996A (en) * | 1992-06-19 | 1994-01-11 | Daikin Ind Ltd | Air conditioner |
| KR20040088827A (en) * | 2003-04-12 | 2004-10-20 | 엘지전자 주식회사 | Multi-air conditioner capable of heating and cooling simultaneously with supercooling- accumulator |
| JP2008309437A (en) * | 2007-06-18 | 2008-12-25 | Panasonic Corp | Air conditioner |
| CN101832621A (en) * | 2010-04-30 | 2010-09-15 | 中国科学院广州能源研究所 | Self-protection control method and self-protection control device of multi-online air-conditioning system |
| CN106382777A (en) * | 2016-08-29 | 2017-02-08 | 珠海格力电器股份有限公司 | Air conditioner system and reflowing control method for reflowing refrigerant of subcooler |
| CN206787105U (en) * | 2017-04-24 | 2017-12-22 | 青岛海尔空调电子有限公司 | Air-conditioning system |
| CN109269138A (en) * | 2018-09-03 | 2019-01-25 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method for preventing compressor from returning liquid |
| CN109579350A (en) * | 2018-12-05 | 2019-04-05 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
| CN109990500A (en) * | 2019-03-04 | 2019-07-09 | 南京天加环境科技有限公司 | A kind of combustion-gas thermal pump air-conditioning system that preventing back liquid and its control method |
| CN211552102U (en) * | 2019-12-31 | 2020-09-22 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioning system |
| CN112629082A (en) * | 2021-01-08 | 2021-04-09 | 珠海格力电器股份有限公司 | Heating control system, multi-split air conditioning system and heating control method |
| CN112815398A (en) * | 2021-01-18 | 2021-05-18 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
-
2022
- 2022-05-31 CN CN202210609472.1A patent/CN114963603A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH062996A (en) * | 1992-06-19 | 1994-01-11 | Daikin Ind Ltd | Air conditioner |
| KR20040088827A (en) * | 2003-04-12 | 2004-10-20 | 엘지전자 주식회사 | Multi-air conditioner capable of heating and cooling simultaneously with supercooling- accumulator |
| JP2008309437A (en) * | 2007-06-18 | 2008-12-25 | Panasonic Corp | Air conditioner |
| CN101832621A (en) * | 2010-04-30 | 2010-09-15 | 中国科学院广州能源研究所 | Self-protection control method and self-protection control device of multi-online air-conditioning system |
| CN106382777A (en) * | 2016-08-29 | 2017-02-08 | 珠海格力电器股份有限公司 | Air conditioner system and reflowing control method for reflowing refrigerant of subcooler |
| CN206787105U (en) * | 2017-04-24 | 2017-12-22 | 青岛海尔空调电子有限公司 | Air-conditioning system |
| CN109269138A (en) * | 2018-09-03 | 2019-01-25 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method for preventing compressor from returning liquid |
| CN109579350A (en) * | 2018-12-05 | 2019-04-05 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
| CN109990500A (en) * | 2019-03-04 | 2019-07-09 | 南京天加环境科技有限公司 | A kind of combustion-gas thermal pump air-conditioning system that preventing back liquid and its control method |
| CN211552102U (en) * | 2019-12-31 | 2020-09-22 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioning system |
| CN112629082A (en) * | 2021-01-08 | 2021-04-09 | 珠海格力电器股份有限公司 | Heating control system, multi-split air conditioning system and heating control method |
| CN112815398A (en) * | 2021-01-18 | 2021-05-18 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4394709B2 (en) | Apparatus and method for preventing accumulation of liquid refrigerant in air conditioner | |
| JP2008089292A (en) | Air conditioner | |
| CN111623558A (en) | Air conditioning system | |
| JP6277005B2 (en) | Refrigeration equipment | |
| JP2019138499A (en) | Air conditioning apparatus | |
| CN114061183A (en) | Air conditioning unit and control method thereof | |
| JP4476946B2 (en) | Refrigeration equipment | |
| JP2010007996A (en) | Trial operation method of air conditioner and air conditioner | |
| JP6817787B2 (en) | Air conditioner | |
| JP2008111585A (en) | Air conditioner | |
| JP3293367B2 (en) | Oil temperature sensor mounting structure for compressor | |
| CN114963603A (en) | System for preventing liquid return during multi-split air conditioner starting and control method | |
| JP5245576B2 (en) | Refrigerant amount determination method for air conditioner and air conditioner | |
| JP2020091080A (en) | Refrigeration cycle device | |
| CN114992899A (en) | Air conditioner and oil blockage prevention control method thereof | |
| CN114151935A (en) | Air conditioning system | |
| JPH04324069A (en) | Refrigerating plant | |
| CN107940796B (en) | Multi-split air conditioner system and starting control method of outdoor unit thereof | |
| CN111765528B (en) | Air conditioner system | |
| CN216814408U (en) | Outdoor unit of air conditioner | |
| JP5761013B2 (en) | accumulator | |
| CN114251873B (en) | Air-cooled cold water heat pump system | |
| JPH07127942A (en) | Freezing device | |
| JPH04320763A (en) | Freezer | |
| EP3978828B1 (en) | Refrigeration cycle device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |