CN109195414B - Air conditioner, electric box and electric box radiator - Google Patents
Air conditioner, electric box and electric box radiator Download PDFInfo
- Publication number
- CN109195414B CN109195414B CN201811207711.0A CN201811207711A CN109195414B CN 109195414 B CN109195414 B CN 109195414B CN 201811207711 A CN201811207711 A CN 201811207711A CN 109195414 B CN109195414 B CN 109195414B
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- heat exchange
- contact surface
- exchange tube
- plate body
- refrigerant
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- 239000003507 refrigerant Substances 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 14
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 238000005057 refrigeration Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to an air conditioner, an electric box and an electric box radiator, wherein the electric box radiator comprises: the first plate body is provided with a first contact surface; the second plate body is provided with a second contact surface facing the first contact surface, and the first plate body is connected with the second plate body in a stacking way; the heat exchange tube is clamped between the first contact surface and the second contact surface, and a refrigerant can be introduced into the heat exchange tube; wherein the area part of the first contact surface located at the outer periphery of the heat exchange tube contacts the area of the second contact surface located at the outer periphery of the heat exchange tube. In the electric box radiator, the main control circuit board in the electric box is fixed on the first plate body or the second plate body, the cold source transferred between the first plate body and the second plate body is less, the cold source used for cooling the main control circuit board on one of the first plate body and the second plate body is less dispersed on the other and released into the air, more cold sources of the refrigerant are directly transferred to the main control circuit board, the cooling effect is better, and the heat dissipation effect of the electric box is better.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner, an electric box and an electric box radiator.
Background
In order to integrate the electrical components in the air conditioner, an electrical box is often arranged in the air conditioner, and the electrical components for controlling the air conditioner are intensively arranged in the electrical box. When the air conditioner is operated, electric elements in the electric box generate heat, and heat is generally dissipated by adopting modes such as fins, fans or refrigerants. However, when the refrigerant is used for radiating the electric element, a plurality of cold sources of the refrigerant are released into the air, and are not directly transmitted to the electric element, so that the electric element has poor radiating performance.
Disclosure of Invention
Based on this, it is necessary to provide an electric box radiator for improving the heat dissipation performance of the electric box, aiming at the problem of poor heat dissipation performance of the electric box.
An electrical box heat sink comprising:
the first plate body is provided with a first contact surface;
the second plate body is provided with a second contact surface facing the first contact surface, and the first plate body and the second plate body are connected in a stacking way; and
the heat exchange tube is clamped between the first contact surface and the second contact surface, and a refrigerant can be introduced into the heat exchange tube;
wherein, the region part of the first contact surface, which is positioned at the periphery of the heat exchange tube, contacts the region of the second contact surface, which is positioned at the periphery of the heat exchange tube.
In the electric box radiator, the heat exchange tube is clamped between the first contact surface and the second contact surface, and the heat exchange tube is clamped and fixed through the first plate body and the second plate body. The refrigerant can be introduced into the heat exchange tube, the heat exchange tube can respectively transmit the cold source of the refrigerant to the first plate body and the second plate body, and the part of the first contact surface, which is positioned at the periphery of the heat exchange tube, is contacted with the part of the second contact surface, which is positioned at the periphery of the heat exchange tube, so that the contact area between the first contact surface and the second contact surface is smaller, and the transmission of the cold source between the first plate body and the second plate body is reduced. Therefore, after the main control circuit board in the electrical box is fixed on the first plate body or the second plate body, the temperature of the cold source transmitted by the refrigerant in the heat exchange tube can be reduced, meanwhile, the cold source transmitted between the first plate body and the second plate body is less, the cold source used for cooling the main control circuit board on one of the first plate body and the second plate body is less dispersed on the other and is released into the air, more cold sources of the refrigerant are directly transmitted to the main control circuit board, the cooling effect is better, and the heat dissipation effect of the electrical box is better.
In one embodiment, the first contact surface and the second contact surface are at least partially in line contact and/or point contact.
In one embodiment, the first contact surface is provided with a first groove, the second contact surface is provided with a second groove, and when the first plate body and the second plate body are stacked, the first groove is in butt joint with the second groove to form a containing cavity for containing the heat exchange tube.
In one embodiment, a plurality of first raised features are provided on one of the first contact surface and the second contact surface, the other of the first contact surface and the second contact surface being in contact with the plurality of first raised features.
In one embodiment, the first plurality of raised features is a plurality of raised strips and the cross-section of the surface having the plurality of raised strips is serrated.
In one embodiment, the inner wall of the first groove is in full contact with the heat exchange tube, and the inner wall of the second groove is in partial contact with the heat exchange tube.
In one embodiment, a plurality of second raised features are provided on an inner wall of the second groove, the plurality of second raised features abutting the heat exchange tube.
In one embodiment, the heat exchange tube comprises a plurality of branch sections and bending sections, each branch section is arranged between the first plate body and the second plate body, and each two adjacent branch sections are connected with the bending sections to be communicated with each other to form a refrigerant passage.
The invention also provides an electric appliance box, which comprises the electric appliance box radiator and a main control circuit board, wherein the main control circuit board is fixed on the first board body or the second board body.
The invention also provides an air conditioner which comprises the electric box and a cold source compensation device, wherein the cold source compensation device is connected with the outlet of the heat exchange tube and is used for cooling the refrigerant with heat flowing out of the heat exchange tube.
In one embodiment, the cold source compensation device comprises an economizer and a throttling device, the economizer comprises a first heat exchange passage and a second heat exchange passage, an inlet of the first heat exchange passage is connected with an outlet of the heat exchange tube, an outlet of the first heat exchange passage is connected with two branch paths, one of the two branch paths is provided with the throttling device and is connected with the second heat exchange passage, a refrigerant in the second heat exchange passage is cooled under the action of the throttling device and exchanges heat with the refrigerant in the first heat exchange tube, and the other of the two branch paths guides out the refrigerant after heat exchange and cooling in the first heat exchange tube.
In one embodiment, the heat exchanger further comprises a compressor and a condenser, wherein an outlet of the second heat exchange passage is connected with an inlet of the compressor, and a branch path for leading out the refrigerant subjected to heat exchange cooling is connected with the condenser.
Drawings
FIG. 1 is a schematic diagram of a radiator of an electrical box according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a hollow device according to an embodiment of the present invention;
fig. 3 is a partial block diagram of the air conditioner shown in fig. 2.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, in an embodiment of the present invention, an electrical box heat sink 100 includes a first plate 10, a second plate 30 and heat exchange tubes 50.
The first plate body 10 and the second plate body 30 are stacked and connected, the first plate body 10 is provided with a first contact surface, the second plate body 30 is provided with a second contact surface facing the first contact surface, the heat exchange tube 50 is clamped between the first contact surface and the second contact surface, and the heat exchange tube 50 is clamped and fixed through the first plate body 10 and the second plate body 30, so that the heat exchange tube 50 is reliably fixed. The refrigerant can be introduced into the heat exchange tube 50, the heat exchange tube 50 can transmit the cold source of the refrigerant to the first plate body 10 and the second plate body 30 respectively, and the part of the area, located at the periphery of the heat exchange tube 50, of the first contact surface contacts the area, located at the periphery of the heat exchange tube 50, of the second contact surface, and the contact area between the first contact surface and the second contact surface is smaller, so that the transmission of the cold source between the first plate body 10 and the second plate body 30 is reduced. Therefore, after the main control circuit board 210 in the electrical box is fixed on the first board body 10 or the second board body 30, the temperature can be reduced by the cold source transmitted by the refrigerant in the heat exchange tube 50, meanwhile, the cold source transmitted between the first board body 10 and the second board body 30 is less, the cold source used for cooling the main control circuit board 210 on one of the first board body 10 and the second board body 30 is less dispersed on the other and released into the air, more cold sources of the refrigerant are directly transmitted to the main control circuit board 210, the cooling effect is better, and the heat dissipation effect of the electrical box is better.
In some embodiments, at least a portion of the first contact surface and the second contact surface are in line contact and/or point contact, so that the region of the first contact surface located at the outer periphery of the heat exchange tube 50 and the region of the second contact surface located at the outer periphery of the heat exchange tube 50 are prevented from being completely contacted to each other to transfer the cold source, and the excessive cold source is prevented from being released into the air. Alternatively, the first plate body 10 is in line contact with the second plate body 30, or the first plate body 10 is in point contact with the second plate body 30, or the first plate body 10 is in line contact with the second plate body 30.
Further, the first contact surface is provided with a first groove 12, the second contact surface is provided with a second groove 32, and when the first plate body 10 and the second plate body 30 are stacked, the first groove 12 and the second groove 32 are in butt joint to form a containing cavity for containing the heat exchange tube 50, and the heat exchange tube 50 is contained and fixed through the containing cavity.
Further, one of the first contact surface and the second contact surface is provided with a plurality of first protruding features 31, the other of the first contact surface and the second contact surface is in contact with the plurality of first protruding features 31, and the first protruding features 31 abut against one plane to block direct transfer of the cold source. Specifically, the first board body 10 is used for fixing the main control circuit board 210 in the electrical box, the second contact surface of the second board body 30 is provided with a plurality of first protruding features 31, the first contact surface of the first board body 10 is a complete surface, and the first board body 10 can more uniformly transfer the cold source to the main control circuit board 210.
Specifically, the first plurality of raised features 31 are a plurality of raised strips, the cross section of the surface having the plurality of raised strips is saw-toothed, and the first contact surface is in line contact with the second contact surface. Specifically, the cross section of each raised strip is triangular, each raised strip extends along the lengthwise direction to form a mitsubishi, one side of the mitsubishi is contacted with the first contact surface or the second contact surface, and the first contact surface and the second contact surface are contacted in a line-to-surface manner. Optionally, the plurality of first raised features are a plurality of raised points, and the first contact surface and the second contact surface are in point-to-surface contact, i.e., point contact between the first contact surface and the second contact surface.
In some embodiments, the inner wall of the first groove 12 is in full contact with the heat exchange tube 50, so as to transfer the cold source of the refrigerant in the heat exchange tube 50 to the first plate body 10 to the maximum extent, and then be used for cooling the electrical components such as the main control circuit board 210; the inner wall of the second groove 32 is in partial contact with the heat exchange tube 50, the heat exchange tube 50 is fixed through the second plate body 30, excessive release of cold sources of the refrigerant in the heat exchange tube 50 into the air is avoided, the inner wall of the second groove 32 is not in direct complete contact with the heat exchange tube 50, the cold sources of the refrigerant in the heat exchange tube 50 can be less transferred to the second plate body 30, the cold sources are prevented from being released into the air from the second plate body 30, and the cooling effect is further improved.
Specifically, a plurality of second protruding features (not shown) are disposed on the inner wall of the second groove 32, and the plurality of second protruding features are abutted with the heat exchange tube 50, so as to support the heat exchange tube 50 to be fully contacted with the inner wall of the first groove 12, and meanwhile, avoid excessive cold source transfer between the heat exchange tube 50 and the second plate 30, and improve the cooling effect. Optionally, the plurality of second raised features are a plurality of ribs and/or a plurality of bumps.
In some embodiments, the heat exchange tube 50 includes a plurality of branch sections 52 and a curved section 54, each branch section 52 is disposed between the first plate body 10 and the second plate body 30, the curved section 54 is connected between every two adjacent branch sections 52 to form a refrigerant passage, the plurality of branch sections 52 are connected in series through the curved section 54, and the refrigerant flows out from one of the plurality of branch sections 52 after entering from the other of the plurality of branch sections 52, passes through the areas where the first plate body 10 and the second plate body 30 are located, and transfers the cold source to the first plate body 10 and the second plate body 30.
Specifically, the plurality of branch sections 52 penetrate through the first plate body 10 and the second plate body 30 along the direction parallel to the lower surface of the first plate body 10 and are arranged in parallel with each other, and finally, the adjacent branch sections 52 are connected through the bending section 54 to form the bent heat exchange tube 50, so that the heat exchange tube has a larger heat exchange surface and a better cooling effect. Optionally, the heat exchange tube 50 is U-shaped.
In the electrical box radiator 100, the heat exchange tube 50 is clamped between the first contact surface and the second contact surface, and the heat exchange tube 50 is clamped and fixed by the first plate 10 and the second plate 30, so that the heat exchange tube 50 is reliably fixed. The refrigerant can be introduced into the heat exchange tube 50, the heat exchange tube 50 can transmit the cold source of the refrigerant to the first plate body 10 and the second plate body 30 respectively, and the part of the area, located at the periphery of the heat exchange tube 50, of the first contact surface contacts the area, located at the periphery of the heat exchange tube 50, of the second contact surface, and the contact area between the first contact surface and the second contact surface is smaller, so that the transmission of the cold source between the first plate body 10 and the second plate body 30 is reduced. Therefore, after the main control circuit board 210 in the electrical box is fixed on the first board body 10 or the second board body 30, the temperature can be reduced by the cold source transmitted by the refrigerant in the heat exchange tube 50, meanwhile, the cold source transmitted between the first board body 10 and the second board body 30 is less, the cold source used for cooling the main control circuit board 210 on one of the first board body 10 and the second board body 30 is less dispersed on the other and released into the air, more cold sources of the refrigerant are directly transmitted to the main control circuit board 210, the cooling effect is better, and the heat dissipation effect of the electrical box is better.
In an embodiment of the present invention, an electrical box is further provided, which includes the electrical box radiator 100 and the main control circuit board 210, where the main control circuit board 210 is fixed on the first board body 10 or the second board body 30, and the first board body 10 and the second board body 30 are partially contacted, so that the first board body 10 and the second board body 30 are prevented from being completely contacted and mutually transferred with a cold source. Specifically, when the active circuit board 210 is disposed on the first board body 10, the cold source on the first board body 10 is prevented from being excessively transferred to the second board body 30, the cold source is prevented from being released into the air from the second board body 30, the utilization rate of the cold source is improved, and the heat dissipation effect of the electrical box is improved.
As shown in fig. 2, in an embodiment of the present invention, an air conditioner 300 is further provided, which includes the electrical box and the cold source compensation device 310, where the cold source compensation device 310 is connected to the outlet of the heat exchange tube 50, and is used for cooling the refrigerant with heat flowing out of the heat exchange tube 50, compensating the cold source lost by cooling the electrical box, avoiding reducing the overall cooling performance of the air conditioner 300 due to cooling the heat exchanger, and ensuring the refrigeration effect of the air conditioner 300.
As shown in fig. 2 to 3, further, the cold source compensating device 310 includes an economizer 320 and a throttle device 340, and the economizer 320 includes a first heat exchanging path h 1 And a second heat exchange passage h 2 A first heat exchange passage h 1 The inlet A of the heat exchange tube 50 is connected with the outlet of the heat exchange tube 50, and the refrigerant of the heat absorbed in the heat exchange tube 50 enters the first heat exchange passage h 1 An inner part; first heat exchange path h 1 And two branch paths (t 1 、t 2 ) Connection, one t of two branch paths 2 A throttling device 340 is arranged on the heat exchange channel h and is connected with the second heat exchange channel h 2 Connected, i.e. in contact with, the second heat-exchange path h 2 Is connected to the inlet C of the second heat exchange path h 2 The refrigerant in the first heat exchange tube 50 is cooled under the action of the throttling device 340 and exchanges heat with the refrigerant in the first heat exchange tube, and the other one t of the two branch paths 1 The first heat exchange passage h 1 And (5) leading out the refrigerant after internal heat exchange and temperature reduction. I.e. the first heat exchange path h 1 The refrigerant flowing out of the middle part is divided into two paths, and one path passes through the sectionThe flow device 340 is cooled and flows into the second heat exchange passage h 2 A second heat exchange passage h 2 Inner supercooling refrigerant and first heat exchange passage h 1 The refrigerant in the heat exchanger exchanges heat to enable the first heat exchange passage h 1 The refrigerant in the air conditioner 300 flows out from the other path after being cooled, and is used for supplying the unit for refrigeration, so that the refrigerant for cooling the electric box and raising the temperature is cooled again, and the whole refrigeration performance of the air conditioner 300 is prevented from being reduced due to the cooling of the electric box. Optionally, the throttle device 340 is a thermal expansion valve.
Further, the air conditioner 300 includes a compressor 360 and a condenser 380, and a second heat exchanging path h 2 Is connected to the inlet of the compressor 360, and a second heat exchange path h 2 The refrigerant after internal cooling and the first heat exchange passage h 1 The refrigerant in the evaporator exchanges heat to evaporate and gasify, and finally enters the compressor 360 to be circulated again. At the same time, a branch path t of the refrigerant after heat exchange and cooling is led out 1 Is connected with the condenser 380, and introduces the refrigerant cooled again into the condenser 380 for condensation, and participates in the refrigeration cycle of the air conditioner 300, thereby ensuring the refrigeration effect of the air conditioner 300.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. An electrical box heat sink (100), characterized by comprising:
a first plate body (10) having a first contact surface;
a second plate (30) having a second contact surface facing the first contact surface, the first plate (10) being in stacked connection with the second plate (30); and
the heat exchange tube (50) is clamped between the first contact surface and the second contact surface, and a refrigerant can be introduced into the heat exchange tube (50);
wherein a portion of the first contact surface located at the outer periphery of the heat exchange tube (50) contacts a portion of the second contact surface located at the outer periphery of the heat exchange tube (50);
a plurality of first raised features (31) are provided on one of the first contact surface and the second contact surface, the other of the first contact surface and the second contact surface being in contact with the plurality of first raised features (31).
2. The electrical box heat sink (100) according to claim 1, wherein at least part of the first contact surface and the second contact surface are in line contact and/or point contact.
3. The electrical box radiator (100) according to claim 1 or 2, wherein the first contact surface is provided with a first groove (12), the second contact surface is provided with a second groove (32), and when the first plate body (10) and the second plate body (30) are stacked, the first groove (12) and the second groove (32) are in butt joint to form a containing cavity for containing the heat exchange tube (50).
4. The electrical box heat sink (100) of claim 1, wherein the first plurality of raised features (31) are a plurality of raised strips, the surface having the plurality of raised strips being serrated in cross-section.
5. The electrical box heat sink (100) of claim 3 wherein the inner wall of the first recess (12) is in full contact with the heat exchange tube (50) and the inner wall of the second recess (32) is in partial contact with the heat exchange tube (50).
6. The electrical box heat sink (100) of claim 5, wherein a plurality of second raised features are provided on an inner wall of the second recess (32), the plurality of second raised features abutting the heat exchange tube (50).
7. The electrical box radiator (100) according to claim 1 or 2, wherein the heat exchange tube (50) comprises a plurality of branch sections (52) and curved sections (54), each branch section (52) is arranged between the first plate body (10) and the second plate body (30), and the curved sections (54) are connected between every two adjacent branch sections (52) to form a refrigerant passage in a communicating manner.
8. An electrical box, characterized by comprising a box body, an electrical box radiator (100) and a main control circuit board (210) which are all arranged in the box body and are any one of the claims 1-7, wherein the main control circuit board (210) is fixed on the first board body (10) or the second board body (30).
9. An air conditioner (300) comprising the electrical box of claim 8 and a cold source compensation device (310), wherein the cold source compensation device (310) is connected to the outlet of the heat exchange tube (50) for cooling the refrigerant with heat flowing out of the heat exchange tube (50).
10. The air conditioner (300) of claim 9, wherein the cold source compensation device (310) includes an economizer (320) and a throttle device (340), the economizer (320) including a first heat exchange path (h) 1 ) And a second heat exchange passage (h 2 ) The first heat exchange passage (h 1 ) Is connected to the outlet of the heat exchange tube (50), the first heat exchange path (h 1 ) And two branch paths (t) 1 、t 2 ) Is connected, one of the two said branch paths (t 2 ) Is provided with the throttling device (340) and is connected with the second heat exchange passage (h 2 ) Is connected with the refrigerant in the second heat exchange passage (h 2) in the throttling device (3)40 Is cooled down and is in contact with the first heat exchange passage (h) 1 ) The refrigerant in the heat exchanger exchanges heat, and the other of the two branch paths (t 1 ) The first heat exchange passage (h 1 ) And (5) leading out the refrigerant after internal heat exchange and temperature reduction.
11. The air conditioner (300) of claim 10, further comprising a compressor (360) and a condenser (380), the second heat exchange path (h 2 ) An outlet (D) of the cooling medium is connected with an inlet of the compressor (360), and a branch path (t) of the cooling medium after heat exchange and cooling is led out 1 ) Is connected to the condenser (380).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811207711.0A CN109195414B (en) | 2018-10-17 | 2018-10-17 | Air conditioner, electric box and electric box radiator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811207711.0A CN109195414B (en) | 2018-10-17 | 2018-10-17 | Air conditioner, electric box and electric box radiator |
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| Publication Number | Publication Date |
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| CN109195414A CN109195414A (en) | 2019-01-11 |
| CN109195414B true CN109195414B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811207711.0A Active CN109195414B (en) | 2018-10-17 | 2018-10-17 | Air conditioner, electric box and electric box radiator |
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| CN (1) | CN109195414B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109855229A (en) * | 2019-03-01 | 2019-06-07 | 珠海格力电器股份有限公司 | It is segmented the method for controlling oil return and multi-line system of oil return |
| CN110785060A (en) * | 2019-10-31 | 2020-02-11 | 珠海格力电器股份有限公司 | Air conditioner cooling system and air conditioner |
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| CN109195414A (en) | 2019-01-11 |
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