CN216668033U - Defrosting system and air conditioner - Google Patents
Defrosting system and air conditioner Download PDFInfo
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- CN216668033U CN216668033U CN202220032907.6U CN202220032907U CN216668033U CN 216668033 U CN216668033 U CN 216668033U CN 202220032907 U CN202220032907 U CN 202220032907U CN 216668033 U CN216668033 U CN 216668033U
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Abstract
The utility model provides a defrosting system and an air conditioner, wherein the defrosting system comprises: the indoor unit is provided with a first pipeline, a second pipeline and an auxiliary heating device; the outdoor unit is provided with a third pipeline, a fourth pipeline and a first four-way valve, and a first interface of the first four-way valve is connected with the third pipeline; and a fourth interface of the second four-way valve is connected with the fourth interface of the first four-way valve, a second interface of the second four-way valve is connected with the fourth pipeline, a third interface of the second four-way valve is connected with the second pipeline, and a first interface of the second four-way valve is connected with the first pipeline. The utility model solves the problem that the indoor environment temperature fluctuates periodically because the heating of the inner machine is stopped when the air conditioner enters the defrosting mode.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a defrosting system and an air conditioner.
Background
At present, the conventional air conditioner can perform periodic defrosting during low-temperature heating, so that the heat exchange capacity of a heat exchanger is prevented from being reduced. When the air conditioner enters a defrosting mode, the outdoor unit serves as a condenser side to defrost, the indoor unit stops heating, indoor environment temperature fluctuates periodically, and user comfort experience is poor. In addition, the pipeline system of the connecting pipes of the indoor unit and the outdoor unit of the multi-connected air conditioning unit is complex and has long flow path, so that the defrosting time is prolonged, and the electric energy consumption is high.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that when the air conditioner enters a defrosting mode, the indoor unit stops heating, so that the indoor environment temperature fluctuates periodically.
In order to solve the problems, the utility model provides a defrosting system and an air conditioner.
In one aspect, the present invention provides a defrost system comprising: the indoor unit is provided with a first pipeline, a second pipeline and an auxiliary heating device; the outdoor unit is provided with a third pipeline, a fourth pipeline and a first four-way valve, and a first interface of the first four-way valve is connected with the third pipeline; and a fourth interface of the second four-way valve is connected with the fourth interface of the first four-way valve, a second interface of the second four-way valve is connected with the fourth pipeline, a third interface of the second four-way valve is connected with the second pipeline, and a first interface of the second four-way valve is connected with the first pipeline.
Compared with the prior art, the technical scheme has the following technical effects: when the air conditioner enters the defrosting mode midway in the heating mode, the second interface and the fourth interface of the second four-way valve are communicated, the first interface and the third interface are communicated, the outer machine completes refrigerant self-circulation, the inner machine does not perform refrigerant circulation any more, and the defrosting mode is prevented from influencing the heating of the inner machine; meanwhile, the inner machine heats through the auxiliary heating device, so that the temperature of the indoor environment is prevented from being greatly fluctuated, and the comfort level in a low-temperature heating mode is improved; the outdoor unit adopts refrigerant self-circulation, so that a refrigerant circulation loop can be shortened, the defrosting efficiency is improved, the defrosting time is shortened, and the heat loss of the refrigerant in the loop is reduced, thereby playing a role in energy conservation; in addition, when the air conditioner is only in a cooling or heating mode, the third interface and the fourth interface of the second four-way valve are communicated, and the first interface and the second interface are communicated, so that the refrigerant circulation between the indoor unit and the outdoor unit is ensured.
In one embodiment of the present invention, the internal unit further includes: an evaporator connecting the first and second pipelines.
The technical effect achieved by adopting the technical scheme is as follows: in a refrigeration mode, the refrigerant of the evaporator sequentially passes through the second pipeline, the third interface of the second four-way valve and the fourth interface of the second four-way valve and enters the outdoor unit, and the refrigerant of the outdoor unit sequentially passes through the second interface of the second four-way valve, the first interface of the second four-way valve and the first pipeline and finally returns to the evaporator; the heating mode is reversed.
In one embodiment of the present invention, the outdoor unit further includes: a condenser; one port of the condenser is connected with a first interface of the first four-way valve through the third pipeline, and the other port of the condenser is connected with a second interface of the second four-way valve through the fourth pipeline.
The technical effect achieved by adopting the technical scheme is as follows: during the defrosting mode, the second interface and the fourth interface of the second four-way valve are communicated, the refrigerant of the condenser sequentially passes through the fourth pipeline, the second interface of the second four-way valve, the fourth interface of the second four-way valve and the third pipeline and finally returns to the condenser, so that the refrigerant of the outer unit in the defrosting mode circulates without flowing through the inner unit, the pipeline is short, the defrosting efficiency is high, and the temperature of the indoor environment is not influenced.
In one embodiment of the present invention, the outdoor unit includes: a compressor; the outlet of the compressor is communicated with the second interface of the first four-way valve, and the inlet of the compressor is communicated with the third interface of the first four-way valve.
The technical effect achieved by adopting the technical scheme is as follows: the compressor is used for compressing a low-temperature low-pressure refrigerant into a high-temperature high-pressure refrigerant; in the defrosting mode, a high-temperature and high-pressure refrigerant discharged from the compressor is used for defrosting the condenser of the outer unit.
In one embodiment of the present invention, the outdoor unit further includes: and the gas-liquid separator is communicated with the inlet of the compressor and the third interface of the first four-way valve.
The technical effect achieved by adopting the technical scheme is as follows: the gas-liquid separator is used for performing gas-liquid separation on a low-temperature low-pressure refrigerant led into the compressor, the gaseous refrigerant enters the compressor, and redundant liquid refrigerant is stored in the gas-liquid separator, so that the compressor can compress and heat the refrigerant conveniently, and the compressor is prevented from being damaged by the liquid refrigerant.
In one embodiment of the present invention, the outdoor unit further includes: and the high-temperature detector is arranged between the outlet of the compressor and the second interface of the first four-way valve.
The technical effect achieved by adopting the technical scheme is as follows: the high temperature detector is used for detecting the temperature of the refrigerant discharged by the compressor, and when the temperature of the refrigerant is too high, the frequency of the compressor can be reduced to reduce the temperature of the refrigerant, so that the condenser is prevented from being damaged due to the too high temperature of the refrigerant.
In one embodiment of the present invention, the outdoor unit further includes: the throttling assembly and/or the filter are/is arranged on the fourth pipeline.
The technical effect achieved by adopting the technical scheme is as follows: the compressor compresses and guides out high-temperature and high-pressure gaseous refrigerant, the refrigerant is defrosted by the condenser and converted into high-pressure liquid refrigerant, impurities of the high-pressure liquid refrigerant are removed by the filter, and the high-pressure liquid refrigerant is converted into low-temperature and low-pressure gaseous refrigerant by the throttling assembly, so that the compressor can pressurize conveniently.
In one embodiment of the utility model, the first and/or second line is provided with a shut-off valve.
The technical effect achieved by adopting the technical scheme is as follows: the stop valve is used for cutting off the first pipeline and/or the second pipeline or throttling, so that the flow of the refrigerant can be adjusted conveniently.
In one embodiment of the utility model, the auxiliary heating device is an electric heater.
The technical effect achieved by adopting the technical scheme is as follows: in the defrosting mode, the inner fan continuously operates, and airflow of the inner fan blows to the electric heater to generate hot airflow, so that heating of an indoor environment is maintained under the condition that the outer machine and the inner machine are blocked, and indoor comfort is improved in the defrosting mode.
In another aspect, the present invention further provides an air conditioner including the defrosting system provided in any of the above embodiments.
The technical effect achieved by adopting the technical scheme is as follows: the air conditioner realizes the self-circulation of the refrigerant of the outer unit and the independent heating effect of the inner unit under the defrosting mode through the defrosting system, thereby avoiding the problem that the heating of the inner unit stops and the comfort degree is influenced under the defrosting mode, shortening the defrosting refrigerant loop, improving the defrosting efficiency and reducing the heat loss of the refrigerant.
In summary, the above embodiments of the present application may have one or more of the following advantages or benefits: i) in the defrosting mode, the second interface and the fourth interface of the second four-way valve are communicated, and the first interface and the third interface are communicated, so that the third pipeline and the fourth pipeline of the outdoor unit are directly communicated, and the refrigerant of the outdoor unit self-circulates, thereby avoiding influencing the heating effect of the indoor environment, shortening the circulating loop of the refrigerant, improving the defrosting efficiency, reducing the heat loss of the refrigerant, reducing the circulating amount of the refrigerant and achieving the effect of saving energy; ii) in the defrosting mode, the indoor unit stops refrigerant circulation, the indoor unit starts the auxiliary heating device, the inner fan continuously operates, continuous heating is realized through the auxiliary heating device, and indoor heating is stopped in the defrosting mode, so that the comfort level of the indoor environment is improved.
Drawings
Fig. 1 is a schematic structural diagram of a defrosting system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a refrigerant cycle of the defrosting system in fig. 1 in a defrosting mode.
Fig. 3 is a schematic diagram of a refrigerant cycle of the defrosting system in fig. 1 in a heating mode.
Fig. 4 is a schematic diagram of a refrigerant cycle of the defrost system in fig. 1 in a cooling mode.
Description of reference numerals:
100-a defrost system; 110-an internal machine; 111-a first conduit; 112-a second conduit; 113-an evaporator; 114-a shut-off valve; 120-an outdoor unit; 121-a third line; 122-a fourth conduit; 123-a first four-way valve; 124-a condenser; 125-a compressor; 126-gas-liquid separator; 127-a high temperature detector; 128-a throttle assembly; 129-a filter; 130-a second four-way valve; 140-an outer fan; 150-internal blower.
Detailed Description
The utility model aims to provide a defrosting system and an air conditioner, wherein the second four-way valve is arranged, so that the refrigerant of an outer machine is self-circulated in a defrosting mode, and an inner machine continuously heats through an auxiliary heating device, so that the inner machine is prevented from stopping heating in the defrosting mode, and the indoor environment temperature is more stable.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1-4, a first embodiment of the present invention provides a defrost system 100, the defrost system 100 comprising: an inner unit 110, an outer unit 120, and a second four-way valve 130. The inner machine 110 is provided with a first pipeline 111, a second pipeline 112 and an auxiliary heating device; the outdoor unit 120 is provided with a third pipeline 121, a fourth pipeline 122 and a first four-way valve 123, and a first interface of the first four-way valve 123 is connected with the third pipeline 121; a fourth port of second four-way valve 130 is connected to a fourth port of first four-way valve 123, a second port of second four-way valve 130 is connected to fourth line 122, a third port of second four-way valve 130 is connected to second line 112, and a first port of second four-way valve 130 is connected to first line 111.
In the present embodiment, the air conditioner periodically enters the defrost mode in the low temperature heating mode. When the defrosting system 100 is in the defrosting mode, the second interface and the fourth interface of the second four-way valve 130 are communicated, the first interface and the third interface are communicated, the third interface and the fourth interface of the first four-way valve 123 are communicated, and the first interface and the second interface are communicated, so that the refrigerant flowing out of the fourth pipeline 122 from the outer unit 120 enters the first four-way valve 123 through the second four-way valve 130, enters the compressor 125, is compressed and returns to the third pipeline 121, the refrigerant self-circulation is completed, meanwhile, the inner unit 110 does not perform refrigerant circulation any more, but performs heating through the auxiliary heating device, thereby preventing the heating of the inner unit 110 from stopping in the defrosting mode, preventing the temperature of the indoor environment from greatly fluctuating, and improving the comfort level in the low-temperature heating mode. In addition, the outdoor unit 120 uses refrigerant self-circulation, so that a refrigerant circulation loop can be shortened, heat loss of the refrigerant in the loop is reduced, defrosting efficiency is improved, defrosting time is shortened, and an energy-saving effect is achieved. In addition, when the air conditioner performs a cooling mode, the third interface and the fourth interface of the second four-way valve 130 are communicated, the first interface and the second interface are communicated, the third interface and the fourth interface of the first four-way valve 123 are communicated, and the first interface and the second interface are communicated; when the air conditioner performs a heating mode, the third interface and the fourth interface of the second four-way valve 130 are communicated, the first interface and the second interface are communicated, the second interface and the fourth interface of the first four-way valve 123 are communicated, and the first interface and the third interface are communicated; thereby ensuring the refrigerant circulation between the inner unit 110 and the outer unit 120 without affecting the cooling mode or the heating mode.
For example, the second interface of the first four-way valve 123 is a D interface, the first interface is a C interface, the fourth interface is an E interface, and the third interface is an S interface. Similarly, the second interface of the second four-way valve 130 is a D interface, the first interface is a C interface, the fourth interface is an E interface, and the third interface is an S interface.
In a specific embodiment, the inner unit 110 further includes, for example: an evaporator 113, the evaporator 113 connecting the first pipe 111 and the second pipe 112. Second conduit 112 connects to a third port of second four-way valve 130; first conduit 111 connects to a first port of second four-way valve 130.
In a specific embodiment, the outer unit 120 further includes, for example: a condenser 124; one port of the condenser 124 is connected to a first interface of the first four-way valve 123 through a third pipeline 121, and the other port of the condenser 124 is connected to a second interface of the second four-way valve 130 through a fourth pipeline 122.
In a specific embodiment, the outer unit 120 further includes, for example: a compressor 125; wherein, the outlet of compressor 125 is connected to the second port of first four-way valve 123, and the inlet of compressor 125 is connected to the third port of first four-way valve 123. The compressor 125 is configured to compress a low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant; in the defrost mode, the high-temperature and high-pressure refrigerant discharged from the compressor 125 is used to defrost the condenser 124 of the outer unit 120.
In the defrosting mode, the refrigerant flows out from the outlet of the compressor 125 to the second port of the first four-way valve 123, flows out from the first port of the first four-way valve 123 to one end of the condenser 124 through the third pipe 121, flows out from the other end of the condenser 124 to the second port of the second four-way valve 130 through the fourth pipe 122, flows out from the fourth port of the second four-way valve 130 to the fourth port of the first four-way valve 123, and flows out from the third port of the first four-way valve 123 to the inlet of the compressor 125. Therefore, the refrigerant circulating in the defrosting mode of the outer unit 120 does not need to flow through the inner unit 110, and thus, the pipe path is short, the defrosting efficiency is high, and the temperature of the indoor environment is not affected.
In the heating mode, the refrigerant flows out from the outlet of the compressor 125 to the second port of the first four-way valve 123, flows out from the fourth port of the first four-way valve 123 to the fourth port of the second four-way valve 130, flows from the third port of the second four-way valve 130 to one end of the evaporator 113 through the second pipe 112, flows from the other end of the evaporator 113 to the first port of the second four-way valve 130 through the first pipe 111, flows from the second port of the second four-way valve 130 to one end of the condenser 124 through the fourth pipe 122, flows from the other end of the condenser 124 to the first port of the first four-way valve 123 through the third pipe 121, and flows out from the third port of the first four-way valve 123 to the inlet of the compressor 125.
In the cooling mode, the refrigerant flows out from the outlet of the compressor 125 to the second port of the first four-way valve 123, flows out from the first port of the first four-way valve 123 to one end of the condenser 124 through the third pipe 121, flows out from the other end of the condenser 124 to the second port of the second four-way valve 130 through the fourth pipe 122, flows through the first pipe 111 to one end of the evaporator 113 from the first port of the second four-way valve 123, flows through the second pipe 112 to the third port of the second four-way valve 130 from the other end of the evaporator 113, flows out from the fourth port of the second four-way valve 130 to the fourth port of the first four-way valve 123, and flows out from the third port of the first four-way valve 123 to the inlet of the compressor 125.
In a specific embodiment, the outer unit 120 further includes, for example: an outer fan 140 toward the condenser 124. In the defrosting mode or the cooling mode, the external fan 140 is used for defrosting the condenser 124 pipeline and cooling the refrigerant; in the heating mode, the external fan 140 is used for evaporating the refrigerant.
In a specific embodiment, the outer unit 120 further includes: and a gas-liquid separator 126, the gas-liquid separator 126 communicating the inlet of the compressor 125 with the third port of the first four-way valve 123. The gas-liquid separator 126 separates a low-temperature and low-pressure refrigerant introduced into the compressor 125 into a gas and a liquid. In the defrosting mode, the gaseous refrigerant enters the compressor 125, and the redundant liquid refrigerant is stored in the gas-liquid separator 126, so that the compressor 125 can compress and heat the refrigerant, and the liquid refrigerant is prevented from damaging the compressor 125.
In a specific embodiment, the outer unit 120 further includes, for example: and a high temperature detector 127, the high temperature detector 127 being provided between the outlet of the compressor 125 and the second port of the first four-way valve 123. The high temperature detector 127 is used for detecting the temperature of the refrigerant discharged from the compressor 125, and the condenser 124 is easily damaged when the temperature of the refrigerant is too high, so that the high temperature detector 127 obtains a signal indicating that the temperature of the refrigerant is too high and sends the signal to the control system, and the control system reduces the frequency of the compressor 125 according to the signal, thereby reducing the temperature of the refrigerant and avoiding the temperature of the refrigerant being too high.
In a specific embodiment, the outer unit 120 further includes, for example: and the throttling assembly 128 is arranged on the fourth pipeline 122. The compressor 125 compresses and discharges a high-temperature and high-pressure gaseous refrigerant, the refrigerant is defrosted by the condenser 124 and converted into a high-pressure liquid refrigerant, and the high-pressure liquid refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant by the throttle assembly 128, so that the compressor 125 can pressurize the refrigerant.
Further, the outer unit 120 includes, for example: a filter 129, the filter 129 being disposed in the fourth conduit 122, for example, between the throttling assembly 128 and the outlet of the condenser 124. The high pressure liquid refrigerant discharged from the condenser 124 passes through the filter 129 to remove impurities and then enters the throttling assembly 128, so as to avoid the throttling assembly 128 from being blocked.
In a particular embodiment, the first 111 and/or second 112 line is provided with a shut-off valve 114. The shutoff valve 114 is used to cut off the first pipeline 111 and/or the second pipeline 112, or to throttle the first pipeline and/or the second pipeline, so as to adjust the flow rate of the refrigerant.
In a specific embodiment, the inner unit 110 further includes, for example: an inner fan 150. In the cooling mode, the inner fan 150 is used for evaporating the refrigerant; in the heating mode, the inner fan 150 releases heat from the refrigerant.
In a specific embodiment, the secondary heating means is, for example, an electric heater. In the defrosting mode, the inner fan 150 continuously operates, and the airflow of the inner fan 150 blows to the electric heater to generate hot airflow, so that the heating of the indoor environment is maintained under the condition that the outer unit 120 and the inner unit 110 are blocked, and the indoor comfort level in the defrosting mode is improved. Wherein the electric heater may be provided to the evaporator 113.
In a specific embodiment, 30s before the defrosting mode starts, the electric heater is started, and the rotating speed of the inner fan 150 is kept unchanged; 30s after the defrosting mode is finished, the electric heater is turned off, and the rotating speed of the inner fan 150 is kept unchanged; when the defrosting mode is stopped, the electric heater is turned off, and the inner fan 150 is turned off.
[ second embodiment ]
A second embodiment of the present invention provides an air conditioner (not shown) including the defrost system 100 of any of the above embodiments. The air conditioner realizes the effects that the refrigerant of the outer unit 120 circulates automatically and the inner unit 110 heats alone in the defrosting mode through the defrosting system 100, so that the problem that the heating of the inner unit 110 stops in the defrosting mode to affect the comfort level is solved, a defrosting refrigerant loop is shortened, the defrosting efficiency is improved, and the heat loss of the refrigerant is reduced.
Preferably, the air conditioner can be a wall-mounted machine, a cabinet machine, a ceiling machine or a multi-split air conditioner. For example, the outdoor unit 120 is simultaneously connected to the fourth ports of the plurality of second four-way valves 130 through the fourth port of the first four-way valve 123, the liquid outlets of the condenser 124 of the outdoor unit 120 are simultaneously connected to the second ports of the plurality of second four-way valves 130, and each of the plurality of second four-way valves 130 corresponds to one of the inner units 110. When the outdoor unit 120 starts the defrosting mode, the second ports and the fourth ports of all the second four-way valves 130 are communicated, the first ports and the third ports are communicated, and all the started indoor units 110 are heated by the auxiliary heating device, so that the fluctuation of the indoor environment temperature is avoided.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the utility model, as defined in the appended claims.
Claims (10)
1. A defrost system, said defrost system comprising:
the indoor unit (110) is provided with a first pipeline (111), a second pipeline (112) and an auxiliary heating device;
the outdoor unit (120) is provided with a third pipeline (121), a fourth pipeline (122) and a first four-way valve (123), and a first interface of the first four-way valve (123) is connected with the third pipeline (121);
a fourth interface of the second four-way valve (130) is connected with a fourth interface of the first four-way valve (123), a second interface of the second four-way valve (130) is connected with the fourth pipeline (122), a third interface of the second four-way valve (130) is connected with the second pipeline (112), and a first interface of the second four-way valve (130) is connected with the first pipeline (111).
2. The defrost system of claim 1, wherein the second and fourth ports of the second four-way valve (130) are in communication when the defrost system is in a defrost mode; and a third interface and a fourth interface of the first four-way valve (123) are communicated, and a first interface and a second interface are communicated.
3. The defrost system of claim 1 wherein the third port and the fourth port of the second four-way valve (130) are in communication and the first port and the second port are in communication when the defrost system is in the heating mode; and a second interface of the first four-way valve (123) is communicated with the fourth interface, and a first interface is communicated with the third interface.
4. The defrost system of claim 1 wherein the third port and the fourth port of the second four-way valve (130) are in communication and the first port and the second port are in communication when the defrost system is in the cooling mode; and a third interface and a fourth interface of the first four-way valve (123) are communicated, and a first interface and a second interface are communicated.
5. Defrost system according to claim 1, characterized in that the inner machine (110) further comprises: an evaporator (113), the evaporator (113) connecting the first pipe (111) and the second pipe (112).
6. The defrost system of claim 1, wherein the outer unit (120) further comprises: a condenser (124);
wherein, one port of the condenser (124) is connected with the first interface of the first four-way valve (123) through the third pipeline (121), and the other port of the condenser (124) is connected with the second interface of the second four-way valve (130) through the fourth pipeline (122).
7. Defrost system according to claim 1, characterized in that the outer unit (120) comprises: a compressor (125);
wherein, the outlet of the compressor (125) is communicated with the second interface of the first four-way valve (123), and the inlet of the compressor (125) is communicated with the third interface of the first four-way valve (123).
8. Defrost system according to claim 7, characterized in that the outer unit (120) further comprises: a gas-liquid separator (126), the gas-liquid separator (126) communicating an inlet of the compressor (125) with a third interface of the first four-way valve (123).
9. The defrost system of claim 1, wherein the outer unit (120) further comprises: a throttling assembly (128) and/or a filter (129), the throttling assembly (128) and/or the filter (129) being provided to the fourth line (122).
10. An air conditioner characterized by comprising the defrosting system of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220032907.6U CN216668033U (en) | 2022-01-07 | 2022-01-07 | Defrosting system and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220032907.6U CN216668033U (en) | 2022-01-07 | 2022-01-07 | Defrosting system and air conditioner |
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| Publication Number | Publication Date |
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| CN216668033U true CN216668033U (en) | 2022-06-03 |
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| CN202220032907.6U Active CN216668033U (en) | 2022-01-07 | 2022-01-07 | Defrosting system and air conditioner |
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| CN (1) | CN216668033U (en) |
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- 2022-01-07 CN CN202220032907.6U patent/CN216668033U/en active Active
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Effective date of registration: 20221012 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315100 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |