CN115200262A - Balanced oil return system of two compressors - Google Patents
Balanced oil return system of two compressors Download PDFInfo
- Publication number
- CN115200262A CN115200262A CN202210779056.6A CN202210779056A CN115200262A CN 115200262 A CN115200262 A CN 115200262A CN 202210779056 A CN202210779056 A CN 202210779056A CN 115200262 A CN115200262 A CN 115200262A
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- compressor
- oil outlet
- oil
- oil return
- return system
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- 239000007788 liquid Substances 0.000 claims abstract description 59
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 112
- 239000010687 lubricating oil Substances 0.000 abstract description 19
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract 2
- 239000003507 refrigerant Substances 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compressor (AREA)
Abstract
The invention discloses a balanced oil return system with two compressors, which comprises a first compressor, a second compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator and a gas-liquid separator, wherein the first compressor and the second compressor are connected in parallel and then are sequentially connected in series with the condenser, the liquid storage dryer, the expansion valve, the evaporator and the gas-liquid separator through pipelines; the displacement of the first compressor is smaller than that of the second compressor, a first oil outlet and a second oil outlet are formed in the gas-liquid separator, and the height of the first oil outlet is lower than that of the second oil outlet; the first oil outlet and the second oil outlet are respectively connected with the first compressor and the second compressor through the first suction pipe and the second suction pipe. Through the height that sets up the height that highly is less than the second oil-out of first oil-out, make gas-liquid separator can rationally distribute lubricating oil to first breathing pipe and second breathing pipe according to the discharge capacity of first compressor and second compressor to realize the balanced oil return of first compressor and second compressor.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a balanced oil return system with double compressors.
Background
The problem of difficult oil return of the compressor generally exists in the double-compressor air conditioner formed by connecting two compressors in parallel at present. When two compressors are operated simultaneously or one compressor is operated, the oil level of one compressor may be too high while the oil level of the other compressor is too low. The long-time low oil level operation of the compressor (namely, the compressor is in an oil loss state for a long time) can influence the overall normal operation of the air conditioning unit.
The patent (application number: 201520458037.9) discloses a cross oil return system of two compressors, which comprises a first compressor, a second compressor, a first oil separator, a second oil separator and a gas-liquid separator, wherein the first compressor is connected with the first oil separator through a first exhaust pipe of the first compressor, the first compressor is connected with the gas-liquid separator through a first air suction pipe of the first compressor, the second compressor is connected with the second oil separator through a second exhaust pipe of the second compressor, the second compressor is connected with the gas-liquid separator through a second air suction pipe of the second compressor, the first oil separator is connected with a second air suction pipe of the second compressor through a first oil discharge pipe of the first oil separator, and the second oil separator is connected with a first air suction pipe of the first compressor through a second oil discharge pipe of the second oil separator.
The scheme adopts a cross oil return mode, and when the single compressor runs, the oil return efficiency is poor; when the oil discharge amount difference of the two compressors is large, the oil return is not uniform; the continuous and stable use of the double-compressor set cannot be ensured.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a balanced oil return system with two compressors, which solves the problems that in the prior art, an air conditioner with two compressors adopts a cross oil return mode, and when a single compressor runs, the oil return efficiency is poor; when the oil discharge amount difference of the two compressors is large, the oil return is not uniform; the continuous and stable use of the double-compressor set cannot be ensured.
In order to achieve the technical purpose, the technical scheme of the invention provides a double-compressor balanced oil return system which comprises a first compressor, a second compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator and a gas-liquid separator, wherein the first compressor and the second compressor are connected in parallel and then are sequentially connected in series with the condenser, the liquid storage dryer, the expansion valve, the evaporator and the gas-liquid separator through pipelines;
the displacement of the first compressor is smaller than that of the second compressor, a first oil outlet and a second oil outlet are formed in the gas-liquid separator, and the height of the first oil outlet is lower than that of the second oil outlet; the first oil outlet and the second oil outlet are respectively connected with the first compressor and the second compressor through the first air suction pipe and the second air suction pipe.
Further, the aperture of the first oil outlet is not larger than that of the second oil outlet.
Furthermore, the branches of the first compressor and the second compressor which are connected in parallel are respectively provided with a one-way valve.
Further, the gas-liquid separator comprises a separator tank body, and a first U-shaped pipe and a second U-shaped pipe which are fixedly arranged in the separator tank body, wherein the installation height of the first U-shaped pipe is smaller than that of the second U-shaped pipe, and the bottom of the first U-shaped pipe and the bottom of the second U-shaped pipe are respectively provided with the first oil outlet and the second oil outlet.
Furthermore, filter screens are fixedly mounted at the first oil outlet on the first U-shaped pipe and the second oil outlet on the second U-shaped pipe.
Furthermore, the first U-shaped pipe and the second U-shaped pipe respectively comprise an air inlet pipe section, an air outlet pipe section and a connecting pipe section, and the air outlet pipe section penetrates through the separator tank body and then is connected with the corresponding first air suction pipe or the second air suction pipe.
Furthermore, a protective baffle is fixedly arranged in the separator tank body and positioned at the top of the air inlet pipe section, and is used for preventing splashed liquid drops from entering the air inlet pipe section to cause liquid impact.
Furthermore, the whole protective baffle is in a herringbone shape, and the air inlet pipe section is covered at the bottom of the protective baffle.
Further, the separator tank body comprises a tank body main body and a top cover detachably and hermetically arranged at the top of the tank body main body, a rotary table is fixedly arranged at the bottom of the tank body main body, and the first U-shaped pipe and the second U-shaped pipe are fixedly connected into a whole and then fixedly arranged on the rotary table.
Further, the top cover is connected with the tank body through threads in a sealing mode.
Compared with the prior art, the invention has the beneficial effects that:
(1) In the double-compressor balanced oil return system, a first oil outlet and a second oil outlet are formed in the gas-liquid separator, and the first oil outlet and the second oil outlet are respectively connected with the first compressor and the second compressor through the first air suction pipe and the second air suction pipe, so that gas and oil can be supplied to and returned from the first compressor and the second compressor by only one gas-liquid separator;
(2) Because the displacement of the first compressor is smaller than that of the second compressor, the height of the first oil outlet is lower than that of the second oil outlet, so that the gas-liquid separator can reasonably distribute lubricating oil to the first air suction pipe and the second air suction pipe according to the displacement of the first compressor and the second compressor, the second compressor with large displacement is prevented from sucking away the lubricating oil required by the first compressor with small displacement when sucking the lubricating oil, balanced oil return of the first compressor and the second compressor is realized, and the stability of the oil return capacity of the first compressor and the second compressor is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a balanced oil return system with two compressors according to the present invention;
FIG. 2 is a schematic view showing a structure of a gas-liquid separator in the embodiment of the present invention;
FIG. 3 is a schematic structural view of a first U-shaped tube according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention provides a double-compressor balanced oil return system which is structurally shown in figure 1 and comprises a first compressor 1, a second compressor 2, a condenser 3, a liquid storage dryer 4, an expansion valve 5, an evaporator 6 and a gas-liquid separator 7, wherein the first compressor 1 and the second compressor 2 are connected in parallel and then are sequentially connected in series with the condenser 3, the liquid storage dryer 4, the expansion valve 5, the evaporator 6 and the gas-liquid separator 7 through pipelines;
the condenser 3 is configured to convert the high-temperature and high-pressure gaseous refrigerant sent by the first compressor 1 and the second compressor 2 into a liquid refrigerant, and dissipate heat absorbed by the refrigerant in the vehicle to the atmosphere through the condenser; the liquid storage dryer 4 is used for absorbing moisture in the pipeline; the expansion valve 5 performs a throttling function for controlling the flow rate of the refrigerant entering the evaporator 6; the evaporator 6 converts the vaporous refrigerant into a gaseous state under a low-pressure condition so as to realize the purposes of heat absorption and refrigeration; the gas-liquid separator 7 is used for separating refrigeration oil, liquid refrigerant and gaseous refrigerant in the system, preventing low-pressure low-temperature steam returning to the compressor from carrying excessive liquid drops, preventing liquid refrigerant from entering a cylinder of the compressor and preventing liquid impact on the compressor;
the displacement of the first compressor 1 is smaller than that of the second compressor 2, a first oil outlet 71 and a second oil outlet 72 are formed in the gas-liquid separator 7, the height of the first oil outlet 71 is lower than that of the second oil outlet 72, and lubricating oil between the first oil outlet 71 and the second oil outlet 72 in the gas-liquid separator 7 is equivalent to the displacement of the lubricating oil in the first compressor 1, so that the maximum oil storage amount in the gas-liquid separator 7 is ensured not to exceed the lubricating oil amount in the first compressor 1, and the lubricating oil can be prevented from being retained in the first compressor 1 or the second compressor 2; the first oil outlet 71 and the second oil outlet 72 are respectively connected with the first compressor 1 and the second compressor 2 through the first suction pipe 8 and the second suction pipe 9.
In the double-compressor balanced oil return system, a first oil outlet 71 and a second oil outlet 72 are formed in the gas-liquid separator 7, and the first oil outlet 71 and the second oil outlet 72 are respectively connected with the first compressor 1 and the second compressor 2 through the first suction pipe 8 and the second suction pipe 9, so that gas and oil can be supplied to and returned from the first compressor 1 and the second compressor 2 by only one gas-liquid separator 7; meanwhile, because the displacement of the first compressor 1 is smaller than that of the second compressor 2, by setting the height of the first oil outlet 71 to be lower than that of the second oil outlet 72, the gas-liquid separator 7 can reasonably distribute lubricating oil to the first air suction pipe 8 and the second air suction pipe 9 according to the displacement of the first compressor 1 and the second compressor 2, so that the second compressor 2 with large displacement can be prevented from sucking away the lubricating oil required by the first compressor 1 with small displacement when sucking the lubricating oil, balanced oil return of the first compressor 1 and the second compressor 2 is realized, and the stability of the oil return capacity of the first compressor 1 and the second compressor 2 is ensured.
By controlling the aperture sizes of the first oil outlet 71 and the second oil outlet 72, the oil return time of the first compressor 1 and the second compressor 2 can be reasonably controlled. As a preferred embodiment, since the displacement of the first compressor 1 is smaller than the displacement of the second compressor 2, the aperture of the first oil outlet 71 is not larger than the aperture of the second oil outlet 72.
As a preferred embodiment, a check valve 10 is installed on each branch of the first compressor 1 and the second compressor 2 connected in parallel, and is used for ensuring unidirectional exhaust of the first compressor 1 and the second compressor 2.
As a preferred embodiment, the gas-liquid separator 7 includes a separator tank 73, and a first U-shaped pipe 74 and a second U-shaped pipe 75 fixedly disposed inside the separator tank, an installation height of the first U-shaped pipe 74 is smaller than an installation height of the second U-shaped pipe 75, and the first oil outlet 71 and the second oil outlet 72 are respectively opened at a bottom of the first U-shaped pipe 74 and a bottom of the second U-shaped pipe 75.
The first U-shaped pipe 74 and the second U-shaped pipe 75 are independently arranged in the separator tank 73, and the first oil outlet 71 and the second oil outlet 72 are respectively formed in the bottom of the first U-shaped pipe 74 and the bottom of the second U-shaped pipe 75, so that the first compressor 1 and the second compressor 2 respectively have independent oil return paths, and the liquid impact phenomenon caused by the splashing inside the separator tank 73 can be prevented.
As a preferred embodiment, filter screens are fixedly mounted at the first oil outlet 71 of the first U-shaped pipe 74 and the second oil outlet 72 of the second U-shaped pipe 75, so as to prevent impurities in the lubricating oil from entering the first U-shaped pipe 74 and the second U-shaped pipe 75.
In a preferred embodiment, each of the first U-shaped pipe 74 and the second U-shaped pipe 75 includes an air inlet pipe section 741, an air outlet pipe section 742 and a connecting pipe section 743, wherein the air inlet pipe section 741 extends to a position near the top of the separator tank 73 so as to be away from the oil in the separator tank 73, so as to prevent the oil from being sucked into the first suction pipe 8 or the second suction pipe 9, and prevent the liquid from entering the first compressor 1 and the second compressor 2 to cause a liquid hammer phenomenon to damage the compressors; the air outlet pipe section 742 passes through the separator tank 73 and is connected to the corresponding first or second air suction pipe 8 or 9.
In a preferred embodiment, a protective baffle 76 is fixedly disposed in the separator tank 73, and the protective baffle 76 is located at the top of the air inlet pipe section 741 and is used for preventing splashed liquid droplets from entering the air inlet pipe section 741 to cause a liquid impact phenomenon.
In a preferred embodiment, the protective baffle 76 is in a shape of a Chinese character 'ren', and the air inlet pipe section 741 is covered at the bottom thereof.
In a preferred embodiment, the separator tank 73 includes a tank body 731 and a top cover 732 detachably and hermetically disposed on the top of the tank body 731, a rotating plate 733 is fixedly disposed at the bottom of the tank body 731, and the first U-shaped tube 74 and the second U-shaped tube 75 are fixedly connected as a whole and then fixedly disposed on the rotating plate 733.
As a specific example, the first U-shaped tube 74 and the second U-shaped tube 75 may be bundled together by a binding wire. A snap ring matched with the first U-shaped tube 74 in shape is fixedly arranged on the rotating plate 733, and the first U-shaped tube 74 is clamped on the rotating plate 733.
In a preferred embodiment, the top 732 is screwed to the body 731 of the can in a sealing manner. By fixedly arranging a rotating disc 733 at the bottom of the tank body 731, when the top cover 732 is rotated to realize the threaded connection with the tank body 731, the first U-shaped tube 74 and the second U-shaped tube 75 penetrating through the top cover 732 and the rotating disc 733 can rotate together, so that the top cover 732 and the tank body 731 can be screwed conveniently.
For the convenience of understanding the present invention, the operation principle of the present solution is described in detail below with reference to fig. 1 to 3:
when the double-compressor balanced oil return system operates, the first compressor 1 and the second compressor 2 do not operate simultaneously, and gas exhausted by the first compressor 1 and the second compressor 2 sequentially passes through the condenser 3, the liquid storage dryer 4, the evaporator 6 and the gas-liquid separator 7 to be processed; when the air suction is performed, the first compressor 1 and the second compressor 2 suck back the lubricating oil discharged by the first compressor 1 and the second compressor 2 through the first air suction pipe 8 and the second air suction pipe 9 respectively, and because the displacement of the first compressor 1 is smaller than that of the second compressor 2, the height of the first oil outlet 71 is lower than that of the second oil outlet 72, the air-liquid separator 7 can reasonably distribute the lubricating oil to the first air suction pipe 8 and the second air suction pipe 9 according to the displacement of the first compressor 1 and the second compressor 2, so that the second compressor 2 with large displacement can be prevented from sucking away the lubricating oil with small displacement required by the first compressor 1 when the lubricating oil is sucked, and the balanced oil return of the first compressor 1 and the second compressor 2 is realized.
The balanced oil return system with the double compressors provided by the invention has the following beneficial effects:
(1) In the double-compressor balanced oil return system, a first oil outlet 71 and a second oil outlet 72 are formed in the gas-liquid separator 7, and the first oil outlet 71 and the second oil outlet 72 are respectively connected with the first compressor 1 and the second compressor 2 through the first air suction pipe 8 and the second air suction pipe 9, so that air supply and oil return can be performed on the first compressor 1 and the second compressor 2 by only using one gas-liquid separator 7;
(2) Because the displacement of the first compressor 1 is smaller than that of the second compressor 2, by setting the height of the first oil outlet 71 to be lower than that of the second oil outlet 72, the gas-liquid separator 7 can reasonably distribute lubricating oil to the first suction pipe 8 and the second suction pipe 9 according to the displacement of the first compressor 1 and the second compressor 2, so that the second compressor 2 with large displacement can be prevented from sucking away the lubricating oil required by the first compressor 1 with small displacement when sucking the lubricating oil, balanced oil return of the first compressor 1 and the second compressor 2 is realized, and the stability of the oil return capacity of the first compressor 1 and the second compressor 2 is ensured;
(3) The first U-shaped pipe 74 and the second U-shaped pipe 75 are independently arranged in the separator tank 73, and the first oil outlet 71 and the second oil outlet 72 are respectively arranged at the bottom of the first U-shaped pipe 74 and the bottom of the second U-shaped pipe 75, so that the first compressor 1 and the second compressor 2 respectively have independent oil return paths, and the liquid impact phenomenon caused by the splashing inside of the separator tank 73 can be prevented.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The double-compressor balanced oil return system is characterized by comprising a first compressor, a second compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator and a gas-liquid separator, wherein the first compressor and the second compressor are connected in parallel and then are sequentially connected with the condenser, the liquid storage dryer, the expansion valve, the evaporator and the gas-liquid separator in series through pipelines;
the displacement of the first compressor is smaller than that of the second compressor, a first oil outlet and a second oil outlet are formed in the gas-liquid separator, and the height of the first oil outlet is lower than that of the second oil outlet; the first oil outlet and the second oil outlet are respectively connected with the first compressor and the second compressor through the first air suction pipe and the second air suction pipe.
2. The dual-compressor balanced oil return system of claim 1 wherein the aperture of the first oil outlet is not greater than the aperture of the second oil outlet.
3. The dual-compressor balanced oil return system according to claim 1, wherein a check valve is installed on each branch of the first compressor and the second compressor connected in parallel.
4. The dual-compressor balanced oil return system according to claim 1, wherein the gas-liquid separator comprises a separator tank body, and a first U-shaped pipe and a second U-shaped pipe which are fixedly arranged inside the separator tank body, the installation height of the first U-shaped pipe is smaller than that of the second U-shaped pipe, and the first oil outlet and the second oil outlet are respectively formed in the bottom of the first U-shaped pipe and the bottom of the second U-shaped pipe.
5. The dual-compressor balanced oil return system according to claim 4, wherein a filter screen is fixedly installed at each of the first oil outlet on the first U-shaped pipe and the second oil outlet on the second U-shaped pipe.
6. The dual-compressor balanced oil return system according to claim 4, wherein the first U-shaped pipe and the second U-shaped pipe each include an inlet pipe section, an outlet pipe section and a connecting pipe section, and the outlet pipe section passes through the separator tank and is connected to the corresponding first suction pipe or the corresponding second suction pipe.
7. The dual-compressor balanced oil return system according to claim 6, wherein a protective baffle is fixedly arranged in the separator tank body, and the protective baffle is located at the top of the air inlet pipe section and is used for preventing splashed liquid drops from entering the air inlet pipe section and causing liquid impact.
8. The dual-compressor balanced oil return system according to claim 7, wherein the protective baffle is integrally shaped like a Chinese character 'ren', and the air inlet pipe section is covered at the bottom of the protective baffle.
9. The double-compressor balanced oil return system according to claim 4, wherein the separator tank body comprises a tank body main body and a top cover detachably and hermetically arranged at the top of the tank body main body, a rotary table is fixedly arranged at the bottom of the tank body main body, and the first U-shaped pipe and the second U-shaped pipe are fixedly connected into a whole and then fixedly arranged on the rotary table.
10. The dual-compressor balanced oil return system according to claim 9, wherein the top cap is hermetically connected to the tank body by a screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210779056.6A CN115200262A (en) | 2022-07-04 | 2022-07-04 | Balanced oil return system of two compressors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210779056.6A CN115200262A (en) | 2022-07-04 | 2022-07-04 | Balanced oil return system of two compressors |
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| CN115200262A true CN115200262A (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210779056.6A Pending CN115200262A (en) | 2022-07-04 | 2022-07-04 | Balanced oil return system of two compressors |
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| CN103673397A (en) * | 2012-09-04 | 2014-03-26 | 约克广州空调冷冻设备有限公司 | Parallel-connection compressor oil way system and refrigerating unit |
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| CN204902319U (en) * | 2015-06-30 | 2015-12-23 | 广东欧科空调制冷有限公司 | Intersection return oil system of two compressors |
| JP2016161163A (en) * | 2015-02-27 | 2016-09-05 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN208459093U (en) * | 2018-05-22 | 2019-02-01 | 广东天鉴检测技术服务股份有限公司 | Comprehensive flue gas sampler, flue gas analyzer and fired power generating unit |
| CN215675591U (en) * | 2021-09-23 | 2022-01-28 | 广东欧科空调制冷有限公司 | Air conditioner heat pump system |
-
2022
- 2022-07-04 CN CN202210779056.6A patent/CN115200262A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430151A (en) * | 2007-11-08 | 2009-05-13 | 无锡同方人工环境有限公司 | Gas-liquid separator suitable for air conditioning system with multi-compressor parallel connection |
| CN103673397A (en) * | 2012-09-04 | 2014-03-26 | 约克广州空调冷冻设备有限公司 | Parallel-connection compressor oil way system and refrigerating unit |
| CN103776209A (en) * | 2012-10-25 | 2014-05-07 | 珠海格力电器股份有限公司 | Gas-liquid separator and compressor system with same |
| CN203385255U (en) * | 2013-06-17 | 2014-01-08 | 南京天加空调设备有限公司 | Gas-liquid separator for double-parallel-compressor multi-connected air conditioning system |
| JP2016161163A (en) * | 2015-02-27 | 2016-09-05 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
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| CN215675591U (en) * | 2021-09-23 | 2022-01-28 | 广东欧科空调制冷有限公司 | Air conditioner heat pump system |
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Application publication date: 20221018 |
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