Frequency converter cooling structure and heat pump system thereof

Abstract

The frequency converter cooling structure comprises an electric appliance box, a heat pipe assembly and an evaporator, a frequency converter is installed in the electric appliance box, the evaporator is located above the electric appliance box, the bottom of the heat pipe assembly penetrates into the electric appliance box, and the frequency converter is installed in the heat pipe assembly. And the top of the heat pipe assembly penetrates into the bottom of the evaporator. According to the scheme, the heat in the frequency converter is introduced to the bottom of the evaporator, so that the bottom of the evaporator can be prevented from frosting, and in addition, the evaporator absorbs heat to act reversely and cool the frequency converter. The device has the advantages of being few in parts, more economical and more environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the field of temperature control equipment, and particularly relates to a frequency converter cooling structure and a heat pump system thereof. Background Art

[0002] With the development of frequency conversion technology, current air conditioners and heat pump heating units all start to use frequency conversion compressors to meet the load requirements under different ambient temperatures, which are more intelligent and energy-saving. A frequency converter is a type of AC electrical drive system that converts AC power frequency into voltage and frequency that can both be adjusted; thus controlling or changing the rotational speed of the compressor. A frequency converter generally includes a rectification part, an energy storage link, and an inversion part. The rectifier bridge and IGBT used therein need to work within an appropriate temperature range, so heat sinks are required for frequency converters to dissipate heat from components. Currently, the main heat dissipation methods are air cooling and liquid cooling; air cooling generally uses an evaporation fan or an external fan for heat dissipation; liquid cooling generally uses the refrigerant in the fluorine circuit system or tap water to cool the heat dissipation plate. The air cooling scheme is relatively simple, but the cooling effect is affected by the ambient temperature, and the structure is relatively complex; the liquid cooling scheme will make the fluorine system pipeline complex, and there is a possibility of condensate on the heat dissipation plate; in addition, the evaporator of the air source heat pump unit will frost during low-temperature operation, especially the copper pipes at the bottom are more likely to frost or freeze.

[0003] Therefore, the technical problem to be solved by this application is how to overcome the problems of excessive temperature of the frequency converter and low-temperature frosting of the evaporator at the same time. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a frequency converter cooling structure. In this solution, the heat in the frequency converter is introduced to the bottom of the evaporator, thereby preventing frosting at the bottom of the evaporator. In addition, the evaporator absorbs heat and acts in reverse to cool the frequency converter. This application has the advantages of fewer components, being more economical and environmentally friendly.

[0005] Specifically, the utility model provides a frequency converter cooling structure, which includes an electrical box, a heat pipe assembly, and an evaporator. The electrical box is installed with a frequency converter. The evaporator is located above the electrical box. The bottom of the heat pipe assembly penetrates into the electrical box, and the top of the heat pipe assembly penetrates into the bottom of the evaporator.

[0006] Preferably, a heat dissipation plate for installing the frequency converter is provided in the electrical box, and the heat dissipation plate is in contact with the heat pipe assembly.

[0007] Preferably, the heat pipe assembly includes a pipe shell, a wick, and end caps. The wick is installed in the pipe shell, and both ends of the pipe shell are sealed by end caps. The wick is provided with a steam channel.

[0008] Preferably, a horizontal section is provided at the top of the heat pipe assembly, and the horizontal section penetrates into the bottom of the evaporator.

[0009] In addition, the present application also proposes a heat pump system, including the frequency converter cooling structure described above.

[0010] The heat pump system further includes a compressor, a condenser, a four-way valve, and an electronic expansion valve. The exhaust port of the compressor is connected to the first interface of the four-way valve through a first pipeline. The second interface of the four-way valve is connected to the input port of the condenser through a second pipeline. The output port of the condenser is connected to the input end of the evaporator through a third pipeline, and the electronic expansion valve is provided on the third pipeline. The output end of the evaporator is connected to the fourth interface of the four-way valve through a fourth pipeline, and the third interface of the four-way valve is connected to the intake port of the compressor through a fifth pipeline.

[0011] Preferably, a gas-liquid separator is installed on the fifth pipeline.

[0012] Preferably, a needle valve and a low-pressure switch are provided on the fifth pipeline.

[0013] Preferably, a filter is provided on the third pipeline.

[0014] Preferably, a high-pressure switch is provided on the first pipeline. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in this embodiment, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0016] Figure 1 is a schematic structural diagram of the frequency converter cooling structure proposed in this embodiment;

[0017] Figure 2 is a schematic internal structure diagram of the heat pipe in this embodiment.

[0018] Among them, the reference numerals involved in the drawings are as follows:

[0019] 11 - electrical box; 12 - heat pipe assembly; 13 - evaporator; 14 - frequency converter; 15 - pipe shell; 16 - wick; 17 - high-pressure switch; 18 - vapor channel; 19 - horizontal section; 20 - compressor; 21 - condenser; 22 - electronic expansion valve; 23 - first pipeline; 24 - first interface; 25 - second interface; 26 - second pipeline; 27 - third pipeline; 28 - fourth pipeline; 29 - fourth interface; 30 - third interface; 31 - fifth pipeline; 32 - gas-liquid separator; 33 - needle valve; 34 - low-pressure switch; 35 - filter. Detailed Embodiments

[0020] The technical solution of the present application will be further described below in conjunction with specific embodiments, but the present application is not limited to these embodiments.

[0021] As Figures 1 to 2 shown, this embodiment proposes a frequency converter cooling structure, including an electrical box 11, a heat pipe assembly 12, and an evaporator 13. The electrical box 11 is installed with a frequency converter 14. The evaporator 13 is located above the electrical box 11. The bottom of the heat pipe assembly 12 penetrates into the electrical box 11, and the top of the heat pipe assembly 12 penetrates into the bottom of the evaporator 13.

[0022] The technical effect of this solution is that: by introducing the heat in the frequency converter 14 to the bottom of the evaporator 13, this solution can prevent frosting at the bottom of the evaporator 13. In addition, the evaporator 13 absorbs heat and acts in reverse to cool the frequency converter 14. And the present application has the advantages of fewer components, being more economical and environmentally friendly.

[0023] Further, a heat dissipation plate for installing the frequency converter 14 is provided in the electrical box 11, and the heat dissipation plate is in contact with the heat pipe assembly 12. In addition, fins are installed on the heat pipe assembly 12 to improve the heat exchange efficiency of the heat pipe assembly 12.

[0024] Further, the heat pipe assembly 12 includes a tube shell 15, a wick 16, and end caps. The wick 16 is installed in the tube shell 15, and both ends of the tube shell 15 are sealed by end caps. A steam channel 18 is provided on the wick 16.

[0025] Figure 2 Only the working principle of the heat pipe is shown, and the end caps at both ends of the tube shell 15 are not shown in the drawings.

[0026] Wherein, the bottom of the heat pipe assembly 12 is heated under the heat exchange action of the frequency converter 14, and the liquid medium in the wick 16 evaporates to form a gaseous medium and flows into the steam channel 18. At this time, the frequency converter 14 is cooled. The steam medium diffuses upward to the top of the steam channel 18 and heats the bottom of the evaporator 13. At this time, the steam at the top is precooled and forms a liquid medium. The liquid medium is absorbed by the wick 16 and diffuses downward under the action of gravity, and returns to the bottom of the wick 16 again, forming a cyclic heat exchange structure.

[0027] As an implementation manner of this embodiment, a horizontal section 19 is provided at the top of the heat pipe assembly 12, and the horizontal section 19 penetrates into the bottom of the evaporator 13. It is used to make the heat exchange at the bottom of the evaporator 13 more uniform.

[0028] In addition, the present application also proposes a heat pump system, including the above-mentioned frequency converter cooling structure.

[0029] The heat pump system further includes a compressor 20, a condenser 21, a four-way valve, and an electronic expansion valve 22. The exhaust port of the compressor 20 is connected to the first interface 24 of the four-way valve through a first pipeline 23. The second interface 25 of the four-way valve is connected to the input port of the condenser 21 through a second pipeline 26. The output port of the condenser 21 is connected to the input end of the evaporator 13 through a third pipeline 27, and the electronic expansion valve 22 is provided on the third pipeline 27. The output end of the evaporator 13 is connected to the fourth interface 29 of the four-way valve through a fourth pipeline 28. The third interface 30 of the four-way valve is connected to the intake port of the compressor 20 through a fifth pipeline 31. Wherein, a gas-liquid separator 32 is installed on the fifth pipeline 31, which is used to make the gas flowing into the compressor 20 more stable and ensure the stable operation of the compressor 20. Further, a needle valve 33 and a low-pressure switch 34 are provided on the fifth pipeline 31. And a filter 35 is provided on the third pipeline 27. A high-pressure switch 17 is provided on the first pipeline 23.

[0030] Wherein, the high-temperature and high-pressure gas generated by the compressor 20 flows into the condenser 21 and forms a liquid low-temperature medium. The medium flows into the evaporator 13 through the electronic expansion valve 22. The medium changes from liquid to other states and absorbs a large amount of heat. In the low-temperature state, frost is likely to form at the bottom of the evaporator 13. At this time, the heat in the frequency converter 14 heats the bottom of the evaporator 13 through a heat pipe, so as to effectively avoid frosting at the bottom of the evaporator 13.

[0031] For those of ordinary skill in the art, without departing from the creative concept of this embodiment, several deformations and improvements can still be made, and these all belong to the protection scope of this embodiment.

Claims

1. A frequency converter cooling structure, characterized in that: The invention comprises an electrical box (11), a heat pipe assembly (12) and an evaporator (13); the electrical box (11) is equipped with a frequency converter (14); the evaporator (13) is located above the electrical box (11); the bottom of the heat pipe assembly (12) penetrates into the electrical box (11); and the top of the heat pipe assembly (12) penetrates into the bottom of the evaporator (13).

2. The inverter cooling structure according to claim 1, characterized in that: The electrical box (11) is provided with a heat sink for mounting the frequency converter (14), and the heat sink is in contact with the heat pipe assembly (12).

3. The inverter cooling structure according to claim 1, characterized in that: The heat pipe assembly (12) comprises a tube shell (15), a liquid wick (16) and an end cover; the liquid wick (16) is installed in the tube shell (15), and both ends of the tube shell (15) are sealed by the end covers; and a steam channel (18) is provided on the liquid wick (16).

4. The inverter cooling structure according to claim 1, characterized in that: A horizontal section (19) is provided at the top of the heat pipe assembly (12), and the horizontal section (19) penetrates to the bottom of the evaporator (13).

5. A heat pump system, characterized in that: It comprises the inverter cooling structure according to any one of claims 1 to 4.

6. The heat pump system according to claim 5, characterized in that: The invention also comprises a compressor (20), a condenser (21), a four-way valve and an electronic expansion valve (22); the exhaust port of the compressor (20) is connected to the first interface (24) of the four-way valve through a first pipeline (23); the second interface (25) of the four-way valve is connected to the input port of the condenser (21) through a second pipeline (26); the output port of the condenser (21) is connected to the input end of the evaporator (13) through a third pipeline (27); the electronic expansion valve (22) is arranged on the third pipeline (27); the output end of the evaporator (13) is connected to the fourth interface (29) of the four-way valve through a fourth pipeline (28); the third interface (30) of the four-way valve is connected to the air inlet of the compressor (20) through a fifth pipeline (31).

7. The heat pump system according to claim 6, characterized in that: A gas-liquid separator (32) is installed on the fifth pipeline (31).

8. The heat pump system according to claim 7, characterized in that: The fifth pipeline (31) is provided with a needle valve (33) and a low-pressure switch (34).

9. The heat pump system according to claim 6, characterized in that: The third pipeline (27) is provided with a filter (35).

10. The heat pump system according to claim 6, characterized in that: A high-pressure switch (17) is provided on the first pipeline (23).

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