A heat dissipation device for a power module of an outdoor unit of an air conditioner

Abstract

The utility model discloses a heat dissipation device for a power module of an outdoor unit of an air-conditioner, belonging to the technical field of heat dissipation of power modules, comprising an outdoor unit fan, an electrical box, a controller board and a power module arranged on the controller board, and also comprising: a heat dissipation structure, arranged on the controller board; the heat dissipation structure comprises an upper heat dissipation block, a lower heat dissipation block and a refrigerant heat dissipation copper tube, the upper heat dissipation block and the lower heat dissipation block are both provided with heat dissipation grooves for placing the refrigerant heat dissipation copper tube, and a plurality of heat dissipation fins are arranged on one end of the lower heat dissipation block away from the heat dissipation groove; in this scheme, by combining refrigerant heat dissipation and eddy wind heat dissipation of an outdoor unit fan, the heat dissipation efficiency of the power module can be greatly improved, the power module can be more effectively protected, the risk of condensation to the controller can be avoided, the stable operation of the controller and the power module can be ensured, the shortcomings of a single heat dissipation method can be effectively avoided, the risk of failure due to heat dissipation problems can be reduced, and the reliability of the air conditioner can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power module heat dissipation, and more specifically relates to a heat dissipation device for a power module of an outdoor unit of an air conditioner. Background Art

[0002] As people's living standards continue to improve in today's society, the requirements for air comfort are also increasing accordingly. Air conditioners can meet this demand very well. As for variable-frequency air conditioners and fixed-frequency air conditioners, more and more people will choose variable-frequency air conditioners because variable-frequency air conditioners have a higher energy efficiency conversion ratio and are more flexible in regulation. Variable-frequency air conditioners are regulated by the controller in the outdoor unit electrical box. The controller board contains multiple power modules, which will generate a lot of heat when working. If they are not heat-dissipated, the heat will continue to accumulate in the electrical box. Excessive temperature will seriously affect its working performance and service life. Therefore, they must be heat-dissipated to ensure that the temperature is within a reasonable range when working.

[0003] At present, most of the variable frequency air conditioner outdoor units on the market only use air cooling for heat dissipation, that is, a heat sink is embedded in the electrical box of the variable frequency air conditioner outdoor unit, and the power module is mounted on the heat sink. The heat transferred from the power module to the heat sink is dissipated by the air volume generated by the fan of the variable frequency air conditioner outdoor fan. However, in a high temperature and high load environment, the heat dissipation efficiency of only using air cooling is insufficient, the heat dissipation effect is poor, and the performance of the air conditioner is affected. In addition, if the air is not smooth at the location where the air conditioner outdoor unit is installed, the heat dissipation effect will be further reduced.

[0004] Therefore, it is necessary to provide a heat dissipation device for a power module of an air conditioner outdoor unit to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a heat dissipation device for a power module of an outdoor unit of an air conditioner to solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A heat dissipation device for a power module of an outdoor unit of an air conditioner, comprising an outdoor unit fan, an electrical box, a controller board and a power module arranged on the controller board, and further comprising:

[0008] A heat dissipation structure, provided on the controller board, for dissipating heat from the power module;

[0009] The heat dissipation structure includes an upper heat dissipation block, a lower heat dissipation block and a refrigerant heat dissipation copper tube. The upper heat dissipation block is in contact with the surface of the power module. Both the upper heat dissipation block and the lower heat dissipation block are provided with heat dissipation grooves for placing the refrigerant heat dissipation copper tube. A plurality of heat dissipation fins are provided at one end of the lower heat dissipation block away from the heat dissipation grooves.

[0010] Furthermore, an expansion valve is provided at one end of the refrigerant heat dissipation copper tube, and the end of the refrigerant heat dissipation copper tube with the expansion valve is connected to the outlet of the outdoor unit condenser copper coil, and the other end of the refrigerant heat dissipation copper tube is connected to the indoor unit evaporator copper coil.

[0011] Furthermore, a side of the upper heat dissipation block facing away from the heat dissipation groove is coated with thermal grease and is in contact with the surface of the power module.

[0012] Furthermore, the upper heat sink block and the lower heat sink block are both provided with a first mounting hole, and the controller board is provided with a long screw matched with the first mounting hole for fixing the upper heat sink block and the lower heat sink block on the controller board.

[0013] Furthermore, the upper heat sink block is provided with a second mounting hole, and the power module is provided with a short screw matched with the second mounting hole for fixing the upper heat sink block and the power module.

[0014] Furthermore, an air duct opening is provided on the electrical box at a position corresponding to the heat dissipation fins.

[0015] Furthermore, an inner groove is provided in the upper heat dissipation block, a fitting block is slidably provided on the inner wall of the inner groove, an elastic member is provided between the bottom of the fitting block and the bottom wall of the inner groove, and the fitting block is coated with thermal conductive silicone grease.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The lower temperature of the refrigerant in this solution allows it to take away some of the high-temperature heat transferred from the power module to the upper heat sink, the lower heat sink and the refrigerant heat sink copper tube when passing through the refrigerant heat sink copper tube and the lower heat sink, and the refrigerant forms a loop and circulates continuously; at the same time, the eddy wind generated by the operation of the outdoor fan will flow through the heat sink fins, effectively taking away some of the heat on the heat sink fins, and can also avoid the hidden danger of condensation on the refrigerant heat sink copper tube causing damage to the controller; through the combination of refrigerant heat dissipation and outdoor fan eddy wind heat dissipation, the heat dissipation efficiency of the power module can be greatly improved, the power module can be more effectively protected, the risk of condensation to the controller can be avoided, the stable operation of the controller and the power module can be ensured, the shortcomings of a single heat dissipation method can be effectively avoided, the risk of failure due to heat dissipation problems can be reduced, and the reliability of the air conditioner can be improved.

[0018] 2. In this solution, the eddy current air volume generated by the outdoor unit fan will pass through the heat dissipation fins and then through the air duct opening on the electrical box, and then the components in the electrical box can be ventilated and cooled, thereby further improving the heat dissipation performance of the controller in the electrical box 2. Good heat dissipation helps to reduce the loss of equipment components and extend the service life of the outdoor unit of the variable frequency air conditioner.

[0019] 3. The composite heat dissipation method in this scheme can better adapt to different environments. The cooling mode can reduce the temperature, increase the operating frequency of the compressor, and improve the heat dissipation effect under high temperature; the heating mode can also not use refrigerant for heat dissipation, and the use of air cooling can also ensure the continuous performance of the air conditioner. When the load changes, the heat dissipation capacity can be adjusted quickly to achieve rapid response and maintain the good performance of the air conditioner. The refrigerant circuit and the air-cooled heat dissipation fin design structure are simple, which can save design and production costs.

[0020] 4. In this solution, when a certain gap is generated between the upper heat sink and the power module after a period of use, the elastic member can drive the fitting block to move through the rebound effect, so that it always fits the power module, thereby ensuring the heat transfer effect when the power module is working, and greatly avoiding the situation where the gap occurs and the heat cannot be effectively transferred. The power module can be effectively protected before the staff inspects it, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of the outdoor unit of the air conditioner of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of an electrical box with a heat dissipation structure installed in the utility model;

[0023] Figure 3 It is a partial structural schematic diagram of the electrical box of the utility model from other viewing angles;

[0024] Figure 4 This is a schematic diagram of the partial structure of the controller board in the electrical box of the utility model;

[0025] Figure 5 This is a schematic diagram of the electrical box structure before the heat dissipation structure of the utility model is installed;

[0026] Figure 6 It is a schematic diagram of the local structure of the heat dissipation structure of the utility model;

[0027] Figure 7 This is a schematic diagram of the exploded structure of the heat dissipation structure of the utility model;

[0028] Figure 8 It is a structural schematic diagram of the upper heat sink of the utility model;

[0029] Fig. 9This is a schematic diagram of the structure of the upper heat dissipation block in the second embodiment of the utility model;

[0030] Fig.10 for Fig. 9 The upper heat sink block in FIG. is a schematic diagram of a partial internal cross-section structure viewed from the front.

[0031] Description of the numbers in the figure:

[0032] 1. External fan; 2. Electrical box; 3. Controller board; 4. Power module; 5. Heat dissipation structure; 51. Upper heat dissipation block; 52. Lower heat dissipation block; 53. Refrigerant heat dissipation copper tube; 54. Heat dissipation groove; 55. Heat dissipation fin; 6. Expansion valve; 7. First mounting hole; 8. Second mounting hole; 9. Elastic part; 10. Air duct opening; 11. Inner groove; 12. Fitting block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] See also Figure 1-8 A heat dissipation device for a power module of an outdoor unit of an air conditioner comprises an outdoor unit fan 1, an electrical box 2, a controller board 3 and a power module 4 arranged on the controller board 3, and further comprises: a heat dissipation structure 5 arranged on the controller board 3 for dissipating heat from the power module 4; the heat dissipation structure 5 comprises an upper heat dissipation block 51, a lower heat dissipation block 52 and a refrigerant heat dissipation copper tube 53, the upper heat dissipation block 51 is in contact with the surface of the power module 4, and a heat dissipation groove 54 for placing the refrigerant heat dissipation copper tube 53 is provided on both the upper heat dissipation block 51 and the lower heat dissipation block 52, and a plurality of heat dissipation fins 55 are provided on one end of the lower heat dissipation block 52 away from the heat dissipation groove 54. An air duct opening 10 is provided at the position of the corresponding heat dissipation fin 55 on the electrical box 2. Among them, the controller board 3 is fixed to the electrical box 2 by screws, and the electrical box 2 is then installed on the middle partition of the outdoor unit of the air conditioner.

[0036] When the variable frequency air conditioner is in working state, the power module 4 on the controller board 3 will continuously release heat. In cooling mode, the refrigerant is controlled by the compressor through the four-way valve to flow into the outdoor unit condenser of the air conditioner, and then the refrigerant flows into the refrigerant heat dissipation copper tube 53 through the copper coil outlet of the outdoor unit condenser. The refrigerant will pass through the upper heat dissipation block 51 and the lower heat dissipation block 52, and then flow back to the compressor, forming a complete loop circulation operation; while in heating mode, the refrigerant is controlled by the compressor through the four-way valve to flow into the indoor unit evaporator, and then the refrigerant flows into the refrigerant heat dissipation copper tube 53 through the copper coil outlet of the indoor unit evaporator, and then the refrigerant passes through the upper heat dissipation block 51 and the lower heat dissipation block 52, and then flows back to the compressor, forming a loop circulation operation. That is, the refrigerant circulates between the indoor unit and the outdoor unit through the compressor. In summary, the lower temperature of the refrigerant allows it to take away part of the high-temperature heat transferred from the power module 4 to the upper heat sink 51, the lower heat sink 52 and the refrigerant heat sink copper tube 53 when passing through the refrigerant heat sink copper tube 53 and the upper heat sink 51 and the lower heat sink 52, and the refrigerant in the refrigerant heat sink copper tube 53 is circulated continuously, thereby greatly reducing the temperature of the power module 4 when it is working.

[0037] At the same time, the heat on the lower heat sink 52 will be transferred to the heat sink fins 55. At the same time, with the assistance of the heat sink fins 55, the eddy wind generated by the operation of the outdoor fan 1 will flow through the heat sink fins 55, effectively taking away part of the heat on the heat sink fins 55, that is, it can effectively take away part of the heat of the heat dissipation structure 5, and can also avoid the hidden danger of condensation on the refrigerant heat dissipation copper tube 53 causing damage to the controller; and the refrigerant can perform heat exchange more deeply and directly. Through the combination of refrigerant heat dissipation and eddy wind heat dissipation of the outdoor fan 1, the heat dissipation efficiency of the power module 4 can be greatly improved, and the power module can be more effectively protected. The heat dissipation effect is good, and the risk of condensation on the controller can be avoided, ensuring the stable operation of the controller and the power module 4 in the electrical box 2, which can effectively avoid the shortcomings of a single heat dissipation method, reduce the risk of failure due to heat dissipation problems, and improve the reliability of the air conditioner. In addition, good heat dissipation helps to reduce the loss of equipment components and extend the service life of the outdoor unit of the variable frequency air conditioner.

[0038] At the same time, the eddy current air volume generated by the external fan 1 will pass through the heat dissipation fins 55 and then through the air duct opening 10 on the electrical box 2, and then the components in the electrical box 2 can be ventilated and cooled, thereby further improving the heat dissipation performance of the controller in the electrical box 2.

[0039] Through the above method, whether it is a high temperature environment or a complex usage scenario, this composite heat dissipation method can better adapt to different environments. The cooling mode can reduce the temperature, increase the compressor operating frequency, and improve the heat dissipation effect under high temperature; the heating mode can also not use refrigerant heat dissipation, and the use of air cooling can also ensure the continuous performance of the air conditioner. When the load changes, the heat dissipation capacity can be adjusted quickly to achieve rapid response and maintain the good performance of the air conditioner.

[0040] The precision of refrigerant heat dissipation and the assistance of air cooling can make the temperature control of the outdoor unit more accurate, thereby optimizing the overall operation effect of the air conditioner. The refrigerant circuit and the air-cooled heat dissipation fins 55 have a simple design structure, which can save design and production costs.

[0041] In this embodiment, preferably, please refer to Figure 1-5 , an expansion valve 6 is provided at one end of the refrigerant heat dissipation copper tube 53, one end of the refrigerant heat dissipation copper tube 53 with the expansion valve 6 is connected to the outlet of the outdoor unit condenser copper coil, and the other end of the refrigerant heat dissipation copper tube 53 is connected to the indoor unit evaporator copper coil. In the cooling state, the compressor passes the refrigerant into the outdoor unit condenser, then enters the refrigerant heat dissipation copper tube 53, and then flows back to the compressor through the indoor unit evaporator; in the heating state, the compressor passes the refrigerant into the indoor unit evaporator, then enters the refrigerant heat dissipation copper tube 53, and then flows back to the compressor through the outdoor unit condenser, thereby forming a loop. The expansion valve 6 on the refrigerant heat dissipation copper tube 53 can control the flow of the refrigerant in the refrigerant heat dissipation copper tube 21, which can be adjusted according to different working environments.

[0042] The side of the upper heat sink 51 away from the heat sink groove 54 is coated with thermal grease and fits the surface of the power module 4. The thermal grease can better transfer the heat of the power module 4 during operation to the upper heat sink 51, and the heat conduction effect is better.

[0043] In this embodiment, preferably, please refer to Figure 6-8 A first mounting hole 7 is provided on the upper heat sink 51 and the lower heat sink 52, and a long screw matched with the first mounting hole 7 is provided on the controller board 3 for fixing the upper heat sink 51 and the lower heat sink 52 on the controller board 3. The upper heat sink 51 and the lower heat sink 52 can be combined and fixed by the controller board 3, that is, the upper heat sink 51 and the lower heat sink 52 are fixed together on the controller board 3, which can improve the tightness of the connection between the upper heat sink 51 and the lower heat sink 52.

[0044] In this embodiment, preferably, please refer to Figure 6-8The upper heat sink 51 is also provided with a second mounting hole 8, and the power module 4 is provided with a short screw adapted to the second mounting hole 8, which is used to fix the upper heat sink 51 and the power module 4. Through the cooperation of the short screw on the power module 4 and the second mounting hole 8, the upper heat sink 51 and the power module 4 can be more closely fitted, thereby improving the subsequent thermal conductivity of the power module 4.

[0045] Embodiment 2:

[0046] See also Figure 9-10 On the basis of the first embodiment, an inner groove 11 is provided in the upper heat sink 51, and a fitting block 12 is slidably provided on the inner wall of the inner groove 11. An elastic member 9 is provided between the bottom of the fitting block 12 and the bottom wall of the inner groove 11. The fitting block 12 is coated with thermal conductive silicone grease. The elastic member 9 in the present application can be a spring or a combination of a spring and a damper. Before installation, when the elastic member 9 is in a natural state, the fitting block 12 protrudes from a part of the surface of the upper heat sink 51, such as Fig.10 When the upper heat sink 51 and the power module 4 are fitted and installed, the fitting block 12 will be squeezed and moved toward the inner groove 11. Finally, when the upper heat sink 51 and the power module 4 are fitted, the fitting block 12 also enters the inner groove 11, and the outer surface of the fitting block 12 contacts the power module 4. At this time, the elastic member 9 is in a compressed state, and the fitting block 12 is made of heat-conducting material. After being used for a period of time and coupled with the long-term vibration of the air conditioner outdoor unit, the short screws and long screws on the upper heat sink 51 may become loose. At this time, a certain gap is generated between the upper heat sink 51 and the power module 4. At this time, the elastic member 9 can drive the fitting block 12 to move through the rebound effect of the elastic member 9, so that the fitting block 12 can always fit the power module 4, thereby ensuring the heat transfer effect of the power module 4 when it is working, greatly avoiding the situation where the gap occurs and the heat cannot be effectively transferred. The power module 4 can be effectively protected before the staff inspects it, which is highly practical.

[0047] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Claims

1. A heat dissipation device for a power module of an outdoor unit of an air conditioner, comprising an outdoor unit fan (1), an electrical box (2), a controller board (3) and a power module (4) arranged on the controller board (3), characterized in that: Also includes: A heat dissipation structure (5), arranged on the controller board (3) and used for dissipating heat from the power module (4); The heat dissipation structure (5) comprises an upper heat dissipation block (51), a lower heat dissipation block (52) and a refrigerant heat dissipation copper tube (53); the upper heat dissipation block (51) is in contact with the surface of the power module (4); both the upper heat dissipation block (51) and the lower heat dissipation block (52) are provided with heat dissipation grooves (54) for accommodating the refrigerant heat dissipation copper tube (53); and a plurality of heat dissipation fins (55) are provided at one end of the lower heat dissipation block (52) away from the heat dissipation grooves (54).

2. The heat dissipation device of the power module of the air conditioner outdoor unit according to claim 1, characterized in that: An expansion valve (6) is provided at one end of the refrigerant heat dissipation copper tube (53); one end of the refrigerant heat dissipation copper tube (53) having the expansion valve (6) is connected to the outlet of the outdoor unit condenser copper coil, and the other end of the refrigerant heat dissipation copper tube (53) is connected to the indoor unit evaporator copper coil.

3. The heat dissipation device of a power module of an air conditioner outdoor unit according to claim 1, characterized in that: The side of the upper heat dissipation block (51) facing away from the heat dissipation groove (54) is coated with thermal conductive silicone grease and is in contact with the surface of the power module (4).

4. The heat dissipation device of a power module of an air conditioner outdoor unit according to claim 1, characterized in that: The upper heat sink (51) and the lower heat sink (52) are both provided with a first mounting hole (7), and the controller board (3) is provided with a long screw matched with the first mounting hole (7) for fixing the upper heat sink (51) and the lower heat sink (52) on the controller board (3).

5. The heat dissipation device of the power module of the air conditioner outdoor unit according to claim 4, characterized in that: The upper heat sink (51) is also provided with a second mounting hole (8), and the power module (4) is provided with a short screw matched with the second mounting hole (8) for fixing the upper heat sink (51) and the power module (4).

6. The heat dissipation device of a power module of an air conditioner outdoor unit according to claim 1, characterized in that: An air duct opening (10) is provided on the electrical box (2) at a position corresponding to the heat dissipation fins (55).

7. The heat dissipation device of a power module of an air conditioner outdoor unit according to claim 1, characterized in that: An inner groove (11) is provided in the upper heat dissipation block (51), a fitting block (12) is slidably provided on the inner wall of the inner groove (11), an elastic member (9) is provided between the bottom of the fitting block (12) and the bottom wall of the inner groove (11), and the fitting block (12) is coated with thermal conductive silicone grease.

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