CN111102757A - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
- Publication number
- CN111102757A CN111102757A CN201911313062.7A CN201911313062A CN111102757A CN 111102757 A CN111102757 A CN 111102757A CN 201911313062 A CN201911313062 A CN 201911313062A CN 111102757 A CN111102757 A CN 111102757A
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- CN
- China
- Prior art keywords
- heat exchanger
- air conditioning
- conditioning system
- compressor
- pipeline
- 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.)
- Granted
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 35
- 239000003507 refrigerant Substances 0.000 claims abstract description 63
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 239000011552 falling film Substances 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 52
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 241000521257 Hydrops Species 0.000 description 2
- 206010030113 Oedema Diseases 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
-
- 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
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The present application provides an air conditioning system. An embodiment of the air conditioning system includes a compressor, a first heat exchanger, a second heat exchanger, a throttling device, and a flash tank. The compressor is connected with the first heat exchanger through a first pipeline, the first heat exchanger is connected with the second heat exchanger through a second pipeline, and the second heat exchanger is connected with the compressor through a third pipeline. The bypass pipeline is connected between the bottom of the flash tank and the first heat exchanger. By applying the technical scheme of the invention, due to the existence of the bypass pipeline, part of accumulated liquid in the second pipeline and the flash tank flows back to the first heat exchanger through the bypass pipeline, so that the loss and waste of the refrigerant are avoided. Furthermore, when the unit needs to extract a refrigerant to cool and lubricate devices such as a bearing, a motor and the like during the second startup, the risk that the bearing is abraded or the unit cannot be started due to insufficient liquid taking is avoided as liquid is ensured in the first heat exchanger, and the reliability of the unit is effectively improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air conditioning system.
Background
At this stage, most of the conventional structure of the falling film type unit is shown in fig. 1 as follows, and comprises a compressor 1, a condenser 2, an evaporator 3, a throttling device 4 and a flash evaporator 5. Wherein, the air suction pipe a is used for connecting the top of the falling film evaporator 3 and an air suction port of the compressor 1; the exhaust pipe b is used for connecting the exhaust port of the compressor 1 and the top of the condenser 2; the liquid inlet pipe assembly c is used for connecting the bottom of the condenser 2 and a liquid inlet of the flash tank 5, and at least one throttling device is arranged in a pipeline; the liquid outlet pipe assembly d is used for connecting a liquid outlet of the flash evaporator 5 and a liquid inlet at the top of the falling film evaporator 3; the air supplementing pipe component e is used for connecting the top of the flash tank 5 and an air supplementing port of the compressor 1; at least one throttle device 4 is arranged in the line between the condenser 2 and the evaporator 3.
When the unit is operated, the refrigerant in the unit flows to the figure 1, the refrigerant in the evaporator 3 is evaporated into a gaseous state under the action of the work of the compressor 1 and exchanges heat with the chilled water, so that the temperature of the chilled water is reduced; the gaseous refrigerant enters the compressor 1 from the air suction pipe a, is compressed by the compressor 1 after passing through the compressor 1 and is discharged into the condenser 2 through the air discharge pipe b to form a high-temperature high-pressure gaseous refrigerant; the high-temperature high-pressure gaseous refrigerant is subjected to heat exchange with cooling water after meeting the condenser pipe, and is cooled into a liquid refrigerant after heat exchange; then, under the action of high pressure in the condenser 2, the liquid refrigerant enters the flash tank 5 after being throttled by the liquid inlet pipe assembly c, part of the throttled refrigerant is flashed into a gas state, and the gas refrigerant is supplemented to the compressor 1 through the gas supplementing pipe assembly e and is compressed and tapped into the condenser 2 again; the other part throttled by the throttling device 4 is still liquid refrigerant, but the temperature of the liquid refrigerant is reduced and the energy efficiency is improved under the action of flash vaporization; and finally, the liquid refrigerant enters the top of the evaporator 3 after being throttled by the liquid outlet pipe assembly d, and as the liquid refrigerant is throttled, one part of the liquid refrigerant is changed into a gaseous refrigerant to absorb one part of the liquid refrigerant, and the other part of the liquid refrigerant is still the liquid refrigerant, but the temperature of the liquid refrigerant is reduced. The gaseous refrigerant is sprayed into the evaporator 3 and flows to the air suction port of the air suction pipe a again to be sucked away by the compressor 1; the liquid refrigerant after cooling is sprayed onto the falling film type liquid equalizing plate, the falling film is subjected to heat exchange on the evaporation pipe in evaporation after the liquid equalizing plate is equalized, the refrigerant is evaporated into a gaseous refrigerant after the heat exchange, the refrigerant flows to the air suction port of the air suction pipe a and is sucked away by the compressor 1 again, and the circulation is carried out, so that the unit is continuously refrigerated.
Because the overall arrangement reason of unit structure space, the liquid outlet pipe subassembly d of flash tank 5 is connected 3 ends of evaporimeter and can be higher than connecting flash tank 5 ends, and the inside part of inserting flash tank 5 of the feed liquor pipe subassembly c of connecting flash tank 5 often can be than higher, leads to when the unit shut down the back, unit pressure balance, can have partly liquid refrigerant hydrops in liquid outlet pipe subassembly pipeline part and the flash tank 5 and can't discharge, will cause refrigerant loss and waste like this. When the second start-up needs to extract the refrigerant from the condenser 2 to cool and lubricate the bearing, the motor and other devices, the liquid is not enough to be taken, and the bearing is abraded or the start-up cannot be carried out.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system, which aims to solve the technical problem that the air conditioning system in the prior art cannot be started due to insufficient lubrication of power parts caused by flash evaporation liquid.
The embodiment of the application provides an air conditioning system, including compressor, first heat exchanger, second heat exchanger, throttling arrangement and flash tank, the compressor links to each other through first pipeline with first heat exchanger, and first heat exchanger passes through the second pipeline with the second heat exchanger and links to each other, and the second heat exchanger passes through the third pipeline with the compressor and links to each other, and throttling arrangement and flash tank setting are on the second pipeline, and the flash tank passes through the fourth pipeline with the tonifying qi mouth of compressor and links to each other, and air conditioning system still includes: and the bypass pipeline is connected between the bottom of the flash tank and the first heat exchanger.
In one embodiment, a control valve is provided on the bypass line.
In one embodiment, the control valve is an electronic expansion valve.
In one embodiment, the air conditioning system further comprises: the power mechanism is connected with the compressor and used for driving the compressor to operate; and the refrigerant recovery pipeline is connected between the power mechanism and the first heat exchanger and used for recovering the refrigerant to supply the power mechanism.
In one embodiment, a refrigerant pump is provided in the refrigerant recovery line.
In one embodiment, the power mechanism comprises a motor and a bearing component which is matched with the motor, and the motor is in driving connection with the compressor.
In one embodiment, the throttling means comprises first and second throttling means mounted upstream and downstream of the flash tank, respectively.
In one embodiment, the first heat exchanger is a condenser and the second heat exchanger is an evaporator.
In one embodiment, the compressor is a two-stage compressor including a first compression end and a second compression end with a gas make-up port of the compressor located between the first compression end and the second compression end.
In one embodiment, the air conditioning system is a falling film unit air conditioning system.
In the above embodiment, since the end of the flash tank connected to the second heat exchanger is higher than the flash tank, the portion of the first heat exchanger inserted into the flash tank through the second pipeline is higher. When the unit is shut down, the pressure of the unit is balanced, and a part of liquid refrigerant accumulated liquid can not be discharged from part of the second pipelines and the flash tank. At this time, due to the existence of the bypass pipeline, part of accumulated liquid in the second pipeline and the flash tank flows back to the first heat exchanger through the bypass pipeline, so that the refrigerant loss and waste are avoided. Furthermore, when the unit needs to extract a refrigerant to cool and lubricate devices such as a bearing, a motor and the like during the second startup, the risk that the bearing is abraded or the unit cannot be started due to insufficient liquid taking is avoided as liquid is ensured in the first heat exchanger, and the reliability of the unit is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of an overall structure of an air conditioning system according to the prior art;
fig. 2 is an overall structural view of an embodiment of an air conditioning system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The technical problem that the air-conditioning system cannot be started due to insufficient lubrication of power parts caused by liquid accumulation of a flash tank in the prior art is solved. An embodiment of an air conditioning system, as shown in fig. 2, includes a compressor 10, a first heat exchanger 20, a second heat exchanger 30, a throttling device, and a flash tank 40. The compressor 10 is connected with the first heat exchanger 20 through a first pipeline, the first heat exchanger 20 is connected with the second heat exchanger 30 through a second pipeline, the second heat exchanger 30 is connected with the compressor 10 through a third pipeline, the throttling device and the flash device 40 are arranged on the second pipeline, and the flash device 40 is connected with an air supplementing port of the compressor 10 through a fourth pipeline. In addition, the air conditioning system comprises a bypass line 61, the bypass line 61 being connected between the bottom of the flash tank 40 and the first heat exchanger 20.
By applying the technical scheme of the invention, the end of the flash tank 40 connected with the second heat exchanger 30 is higher than the flash tank 40, and the part of the first heat exchanger 20 inserted into the flash tank 40 through the second pipeline is higher. When the unit is shut down, the pressure of the unit is balanced, and a part of liquid refrigerant accumulated liquid exists in part of the second pipeline and the flash tank 40 and cannot be discharged. At this time, due to the existence of the bypass line 61, a part of the second line and the accumulated liquid existing in the flash tank 40 will flow back to the first heat exchanger 20 through the bypass line 61, so that the refrigerant loss and waste are not caused. Furthermore, when the unit needs to extract a refrigerant to cool and lubricate devices such as a bearing, a motor and the like during the second startup, the liquid in the first heat exchanger 20 is ensured, so that the risk that the bearing is abraded or the unit cannot be started due to insufficient liquid taking is avoided, and the reliability of the unit is effectively improved.
Optionally, in the technical solution of this embodiment, the flash tank 40 includes at least one liquid inlet, and the insertion end is located at the bottom of the gas-liquid filter screen and is used for connecting with the second pipeline; at least one liquid outlet is arranged at the bottom of the flash tank 40 and is connected with a bypass pipeline 61; at least one air supplement port is located at the top of the flash tank 40 for connection to a fourth line.
As an alternative implementation, as shown in fig. 2, in the solution of the present embodiment, the first heat exchanger 20 is a condenser, and the second heat exchanger 30 is an evaporator. More preferably, the evaporator is a falling film evaporator, and comprises at least one suction port, at the top of the evaporator and at least one liquid inlet at the upper part of a liquid equalizing pipe of the falling film evaporator. The second pipeline is connected with the top of the falling film evaporator to better realize the evaporation of the liquid refrigerant. The condenser contains at least one exhaust port, is located condenser top, at least one liquid outlet, is located condenser bottom, at least one by pass port, is located the condenser and is less than the position of flash tank 40 lowest position to derive the hydrops in flash tank 40.
As another alternative embodiment, the first heat exchanger 20 may be an evaporator, and the second heat exchanger 30 may be a condenser. This embodiment also achieves the effect of facilitating the removal of the liquid loading from the flash tank 40.
More preferably, a control valve 611 is provided in the bypass line 61 to control the operation of the bypass line 61. Preferably, the control valve 611 is an electronic expansion valve, so as to realize the adjustable and controllable two-stage orifice plate.
As shown in fig. 2, optionally, in the technical solution of the present embodiment, the air conditioning system further includes a power mechanism 70 and a refrigerant recovery pipeline 62, the power mechanism 70 is connected to the compressor 10 for driving the compressor 10 to operate, and the refrigerant recovery pipeline 62 is connected between the power mechanism 70 and the first heat exchanger 20. When the air conditioning unit is used, the refrigerant is recovered through the refrigerant recovery pipeline 62 and is supplied to the power mechanism 70, so that the power mechanism 70 can be lubricated and cooled normally, and the air conditioning unit is started normally. Optionally, the power mechanism 70 includes a motor and a bearing component installed in cooperation with the motor, and the motor is drivingly connected to the compressor 10. The refrigerant recovered by the refrigerant recovery pipeline 62 is respectively supplied to the motor and the bearing part and other elements which are installed in a matching way with the motor, so that the effective lubrication and cooling of the power mechanism 70 are realized. More preferably, the refrigerant recovery pipeline 62 is provided with a refrigerant pump 621, and the refrigerant pump 621 pumps the refrigerant in the first heat exchanger 20 to realize automatic recovery of the startup refrigerant.
More preferably, as shown in fig. 2, in the solution of the present embodiment, the throttling device includes a first throttling device 51 and a second throttling device 52, and the first throttling device 51 and the second throttling device 52 are respectively installed upstream of the flash tank 40 and downstream of the flash tank 40. The refrigerant is reduced in pressure by the first throttling device 51 and then enters the flash tank 40, where the throttled and flashed gaseous refrigerant is separated from the liquid refrigerant, and the liquid refrigerant flows out of the flash tank 30, is reduced in pressure by the second throttling device 52, and then enters the second heat exchanger 30.
Optionally, in the technical solution of this embodiment, the compressor 10 is a two-stage compressor 10, and includes a first compression end and a second compression end, and the air supplement port of the compressor 10 is located between the first compression end and the second compression end. The compressor includes at least one suction port, at least one discharge port, and at least one make-up port.
It should be noted that the technical solution of the present invention is particularly suitable for a falling film type unit air conditioning system.
In the technical scheme of the invention, the bypass pipeline 61 is arranged at the bottom of the flash tank 40 and at the position where the condenser is lower than the lowest position of the flash tank 40, so that the liquid-state retained refrigerant in the flash tank 40 can flow into the condenser after shutdown, the refrigerant recovery pipeline 62 can obtain liquid when the unit is started for the second time, the problems that the liquid is not obtained during the restarting, the bearing is abraded or the starting cannot be carried out due to insufficient lubrication and cooling of the bearing are avoided, and the reliability of the unit is effectively improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An air conditioning system, comprising a compressor (10), a first heat exchanger (20), a second heat exchanger (30), a throttling device and a flash tank (40), wherein the compressor (10) is connected with the first heat exchanger (20) through a first pipeline, the first heat exchanger (20) is connected with the second heat exchanger (30) through a second pipeline, the second heat exchanger (30) is connected with the compressor (10) through a third pipeline, the throttling device and the flash tank (40) are arranged on the second pipeline, the flash tank (40) is connected with an air supplementing port of the compressor (10) through a fourth pipeline, the air conditioning system is characterized in that,
the air conditioning system further includes:
a bypass line (61), the bypass line (61) being connected between the bottom of the flash tank (40) and the first heat exchanger (20).
2. Air conditioning system according to claim 1, characterized in that a control valve (611) is arranged on the bypass line (61).
3. Air conditioning system according to claim 2, characterized in that the control valve (611) is an electronic expansion valve.
4. The air conditioning system of claim 1, further comprising: the power mechanism (70) is connected with the compressor (10) and is used for driving the compressor (10) to run;
and a refrigerant recovery pipeline (62) connected between the power mechanism (70) and the first heat exchanger (20), wherein the refrigerant recovery pipeline (62) is used for recovering the refrigerant and supplying the refrigerant to the power mechanism (70).
5. The air conditioning system of claim 4, wherein a refrigerant pump (621) is disposed on the refrigerant recovery line (62).
6. Air conditioning system according to claim 4, characterized in that said power means (70) comprise an electric motor and a bearing member fitted to said electric motor, said electric motor being drivingly connected to said compressor (10).
7. Air conditioning system according to claim 1, characterized in that said throttling means comprise a first throttling means (51) and a second throttling means (52), said first throttling means (51) and said second throttling means (52) being installed upstream of said flash tank (40) and downstream of said flash tank (40), respectively.
8. Air conditioning system according to claim 1, wherein the first heat exchanger (20) is a condenser and the second heat exchanger (30) is an evaporator.
9. Air conditioning system according to claim 1, wherein the compressor (10) is a two-stage compressor (10) comprising a first compression end and a second compression end, the inlet of the compressor (10) being located between the first compression end and the second compression end.
10. The air conditioning system of claim 1, wherein the air conditioning system is a falling film unit air conditioning system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911313062.7A CN111102757B (en) | 2019-12-18 | 2019-12-18 | Air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911313062.7A CN111102757B (en) | 2019-12-18 | 2019-12-18 | Air conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111102757A true CN111102757A (en) | 2020-05-05 |
| CN111102757B CN111102757B (en) | 2021-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911313062.7A Active CN111102757B (en) | 2019-12-18 | 2019-12-18 | Air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111102757B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322289A (en) * | 1998-10-09 | 2001-11-14 | 美国标准公司 | Oil-free liquid chiller |
| CN101191686A (en) * | 2006-11-30 | 2008-06-04 | 海尔集团公司 | Air conditioner for implementing high and low pressure side pressure balancing |
| CN109708198A (en) * | 2018-12-27 | 2019-05-03 | 珠海格力电器股份有限公司 | Air-conditioner system, air conditioner and the method for controlling air conditioner |
| CN208952452U (en) * | 2018-07-25 | 2019-06-07 | 中国科学院广州能源研究所 | A kind of quasi- second level ultralow-temperature air energy heat pump of double-condenser |
-
2019
- 2019-12-18 CN CN201911313062.7A patent/CN111102757B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322289A (en) * | 1998-10-09 | 2001-11-14 | 美国标准公司 | Oil-free liquid chiller |
| CN101191686A (en) * | 2006-11-30 | 2008-06-04 | 海尔集团公司 | Air conditioner for implementing high and low pressure side pressure balancing |
| CN208952452U (en) * | 2018-07-25 | 2019-06-07 | 中国科学院广州能源研究所 | A kind of quasi- second level ultralow-temperature air energy heat pump of double-condenser |
| CN109708198A (en) * | 2018-12-27 | 2019-05-03 | 珠海格力电器股份有限公司 | Air-conditioner system, air conditioner and the method for controlling air conditioner |
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| Publication number | Publication date |
|---|---|
| CN111102757B (en) | 2021-06-22 |
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Effective date of registration: 20231106 Address after: 519070, 1st Floor, Building 7, No. 789 Jinji Road, Qianshan, Zhuhai, Guangdong Province Patentee after: Zhuhai Gree Green Control Technology Co.,Ltd. Address before: 519070 No. six Jinji Road West, Zhuhai, Guangdong Patentee before: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI |