Heat dissipation structure, electrical box assembly, refrigeration equipment and heat dissipation control method

Abstract

The present invention provides a heat dissipation structure, an electrical box assembly, a refrigeration device, and a heat dissipation control method, which relate to the technical field of refrigeration equipment and solve the technical problem in the prior art that traditional refrigerant heat dissipation directly takes liquid from the condenser, resulting in high temperature and low heat exchange efficiency. The heat dissipation structure includes a heat dissipation pipeline and a refrigerant conversion unit arranged on the heat dissipation pipeline. There is a heat dissipation refrigerant inlet end and a heat dissipation refrigerant outlet end on the heat dissipation pipeline. The heat dissipation refrigerant inlet end is connected to the outlet of the evaporator, and the heat dissipation refrigerant outlet end can pass through the electrical box and be connected to the compressor. The gaseous refrigerant flowing into the heat dissipation pipeline from the outlet of the evaporator can be converted into liquid by the refrigerant conversion unit and then transported to the electrical box to dissipate heat for the components in the electrical box. The present invention utilizes the low-temperature refrigerant on the evaporation side, combined with the refrigerant conversion unit to perform heat exchange to dissipate heat to the electrical box. The heat dissipation method is simple and the heat exchange effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a heat dissipation structure, an electrical box component, a refrigeration device and a heat dissipation control method. Background Art

[0002] Generally, the heat dissipation solutions for electrical boxes in refrigeration systems include fan heat dissipation and refrigerant heat dissipation. Traditional fan heat dissipation is generally achieved by installing an additional heat dissipation fan. This heat dissipation method has the characteristics of high failure rate and poor waterproof performance.

[0003] The refrigerant heat dissipation is to lead the heat from the electrical box through the condenser outlet pipe, and take away the heat from the electrical box through the refrigerant. This heat dissipation solution is relatively simple and reliable, but the liquid is taken directly from the condenser, the temperature is high, and it cannot be adjusted. It cannot maximize the utilization of the system refrigerant temperature, and the heat exchange efficiency is low. In addition, the conventional refrigerant heat dissipation method will cause drive frequency limiting and frequency reduction when the external ambient temperature is relatively high, resulting in insufficient cooling capacity. This method will not cause frequency limiting and frequency reduction. Summary of the Invention

[0004] The present invention aims to provide a heat dissipation structure, an electrical box assembly, a refrigeration device, and a heat dissipation control method to address the technical issues of conventional refrigerant heat dissipation, which directly draws liquid from the condenser, resulting in high temperatures and low heat exchange efficiency. The various technical effects of the preferred technical solutions provided by the present invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] According to a first aspect of an embodiment of the present invention, a heat dissipation structure is provided, comprising a heat dissipation pipeline and a refrigerant conversion unit arranged on the heat dissipation pipeline, wherein a heat dissipation refrigerant inlet end and a heat dissipation refrigerant outlet end are provided on the heat dissipation pipeline, the heat dissipation refrigerant inlet end is connected to the outlet of the evaporator, the heat dissipation refrigerant outlet end can pass through the electrical box and be connected to the compressor, and the gaseous refrigerant flowing into the heat dissipation pipeline from the outlet of the evaporator can be converted into liquid by the refrigerant conversion unit and then transported to the electrical box to dissipate heat to the components in the electrical box.

[0007] As an optional embodiment of the present invention, the refrigerant conversion part is a regenerator structure, which is connected to the outlet of the condenser. The refrigerant flowing to the heat dissipation pipeline through the outlet of the evaporator exchanges heat with the refrigerant flowing from the condenser to the regenerator structure in the regenerator structure.

[0008] As an optional embodiment of the present invention, the regenerator structure has a first heat exchange pipeline and a second heat exchange pipeline that are not connected to each other. The first heat exchange pipeline of the regenerator structure is connected to the heat dissipation pipeline, and the refrigerant flowing out of the evaporator can be transported to the electrical box through the first heat exchange pipeline of the regenerator structure; the second heat exchange pipeline of the regenerator structure is connected in the refrigeration cycle loop, and the refrigerant flowing out of the condenser can be transported to the evaporator through the second heat exchange pipeline of the regenerator.

[0009] As an optional embodiment of the present invention, the heat dissipation pipeline includes an evaporator connecting pipeline and a compressor connecting pipeline. The two ends of the first heat exchange pipeline of the regenerator structure are respectively connected to the evaporator connecting pipeline and the compressor connecting pipeline. The end of the evaporator connecting pipeline away from the first heat exchange pipeline is formed with the heat dissipation refrigerant inlet end, and the end of the compressor connecting pipeline away from the first heat exchange pipeline is formed with the heat dissipation refrigerant outlet end.

[0010] As an optional embodiment of the present invention, a solenoid valve is provided on the heat dissipation pipeline, and the solenoid valve is provided between the heat dissipation refrigerant inlet and the refrigerant conversion part.

[0011] As an optional embodiment of the present invention, the heat dissipation structure further includes an inlet temperature sensing portion and an outlet temperature sensing portion. The inlet temperature sensing portion is provided on the heat dissipation pipeline near the inlet of the electrical box, and the outlet temperature sensing portion is provided on the heat dissipation pipeline near the outlet of the electrical box.

[0012] As an optional embodiment of the present invention, the refrigerant conversion unit adopts a microchannel heat exchanger or an economizer.

[0013] According to a second aspect of an embodiment of the present invention, an electrical box assembly is provided, comprising an electrical box and the above-mentioned heat dissipation structure, wherein the electrical box is provided with an inlet and an outlet for passing through the heat dissipation pipeline, and the refrigerant in the heat dissipation pipeline can dissipate heat from the components in the electrical box.

[0014] According to a third aspect of an embodiment of the present invention, a refrigeration device is provided, comprising the above-mentioned heat dissipation structure or the above-mentioned electrical appliance box assembly.

[0015] As an optional embodiment of the present invention, the refrigeration equipment also includes a compressor, a condenser and an evaporator that form a refrigeration cycle loop. The refrigerant at the outlet of the evaporator flows to the compressor and the heat dissipation pipeline through two branches respectively. An electronic expansion valve is arranged between the outlet of the evaporator and the air intake of the compressor.

[0016] According to a third aspect of an embodiment of the present invention, a heat dissipation control method is provided, which utilizes the above-mentioned heat dissipation structure to dissipate heat from the electrical box. The method includes:

[0017] Obtaining the inlet refrigerant temperature of the heat dissipation pipe passing through the inlet of the electrical box and the outlet refrigerant temperature of the heat dissipation pipe passing through the outlet of the electrical box;

[0018] The flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled according to the inlet refrigerant temperature and the outlet refrigerant temperature.

[0019] As an optional embodiment of the present invention, the step of controlling the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator according to the inlet refrigerant temperature and the outlet refrigerant temperature includes:

[0020] Obtaining a temperature difference between the outlet refrigerant temperature and the inlet refrigerant temperature;

[0021] Comparing the temperature difference with the target temperature difference;

[0022] The flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled according to the comparison result.

[0023] As an optional embodiment of the present invention, the step of controlling the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator according to the comparison result includes:

[0024] If the temperature difference is greater than the target temperature difference, the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator is increased until the temperature difference is equal to the target temperature difference;

[0025] If the temperature difference is equal to the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is kept unchanged;

[0026] If the temperature difference is less than the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is reduced until the temperature difference is equal to the target temperature difference.

[0027] As an optional implementation of the present invention, the refrigerant at the outlet of the evaporator flows to the compressor and the heat dissipation pipeline respectively through two branches. An electronic expansion valve is provided between the outlet of the evaporator and the air intake of the compressor. The flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled by adjusting the opening of the electronic expansion valve.

[0028] As an optional implementation mode of the present invention, by controlling the opening of the electronic expansion valve to decrease, the refrigerant flow rate flowing into the heat dissipation pipe through the outlet of the evaporator can be increased; by controlling the opening of the electronic expansion valve to increase, the refrigerant flow rate flowing into the heat dissipation pipe through the outlet of the evaporator can be reduced; by controlling the opening of the electronic expansion valve to remain unchanged, the refrigerant flow rate flowing into the heat dissipation pipe through the outlet of the evaporator can be kept unchanged.

[0029] The heat dissipation structure provided by the present invention, in a refrigeration system, draws a heat dissipation pipeline from the evaporator, directing the refrigerant from the evaporator to a refrigerant conversion unit for heat exchange. The pipeline then flows to the electrical box to dissipate heat from the components within the box, and finally returns to the compressor. This heat dissipation structure utilizes the low-temperature refrigerant on the evaporation side, combined with the refrigerant conversion unit to exchange heat for the electrical box, resulting in a simple heat dissipation method and improved heat exchange efficiency.

[0030] In addition, by adjusting the opening of the electronic expansion valve on the line between the evaporator outlet and the compressor in the refrigeration cycle, the amount of refrigerant flowing into the heat dissipation pipeline can be controlled, thereby adjusting the refrigerant temperature in the heat dissipation pipeline. This can maximize the use of the system refrigerant temperature to dissipate heat and improve heat exchange efficiency. Furthermore, the refrigerant exiting the evaporator is in a gaseous state, and the refrigerant conversion unit can convert the gaseous refrigerant passing through the heat dissipation pipeline into a liquid state. This can prevent the low-temperature refrigerant on the evaporation side from directly reaching the electrical box, causing condensation or frosting, which would affect the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a system schematic diagram of a refrigeration device provided by an embodiment of the present invention;

[0033] Figure 2 is a flow chart of a heat dissipation control method provided by an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the heat dissipation control logic of the electrical box provided by an embodiment of the present invention.

[0035] Figure numerals: 1. Heat dissipation pipeline; 100. Evaporator connecting pipeline; 110. Compressor connecting pipeline; 2. Refrigerant conversion unit; 3. Electrical box; 4. Evaporator; 5. Compressor; 6. Oil separator; 7. Condenser; 8. Liquid reservoir; 9. Filter; 10. First expansion valve; 11. Second expansion valve; 12. Low pressure sensor; 13. Vapor-liquid separator; 14. Inlet temperature sensing package; 15. Outlet temperature sensing package. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0037] See also Figure 1 The present invention provides a heat dissipation structure that utilizes the refrigerant drawn from the evaporator 4 side to provide heat dissipation for the electrical box 3 in the refrigeration system. The heat dissipation structure includes a heat dissipation pipeline 1 and a refrigerant conversion unit 2 provided on the heat dissipation pipeline 1. The heat dissipation pipeline 1 has a heat dissipation refrigerant inlet end and a heat dissipation refrigerant outlet end. The heat dissipation refrigerant inlet end is connected to the outlet of the evaporator 4. The heat dissipation refrigerant outlet end on the heat dissipation pipeline 1 can pass through the electrical box 3 and be connected to the compressor 5. The gaseous refrigerant flowing into the heat dissipation pipeline 1 from the outlet of the evaporator 4 can be converted into liquid by the refrigerant conversion unit 2 and then transported to the electrical box 3 to dissipate heat from the components in the electrical box 3. This avoids the problem of high temperature of the liquid directly taken from the condenser 7, which affects the heat exchange efficiency.

[0038] The refrigerant conversion part 2 in this embodiment is a regenerator structure, which is connected to the outlet of the condenser 7. The refrigerant flowing to the heat dissipation pipe 1 through the outlet of the evaporator 4 exchanges heat with the refrigerant flowing from the condenser 7 to the regenerator structure in the regenerator structure.

[0039] Specifically, the regenerator structure includes a first heat exchange pipeline and a second heat exchange pipeline that are not interconnected. The first heat exchange pipeline of the regenerator structure is connected to the heat dissipation pipeline 1, and the refrigerant flowing out of the evaporator 4 can be transported to the electrical box 3 through the first heat exchange pipeline of the regenerator structure. The second heat exchange pipeline of the regenerator structure is connected to the refrigeration cycle, and the refrigerant flowing out of the condenser 7 can be transported to the evaporator 4 through the second heat exchange pipeline of the regenerator structure. The regenerator structure in this embodiment can be a microchannel heat exchanger, an economizer, or the like.

[0040] As an optional embodiment of the present invention, heat dissipation pipeline 1 includes an evaporator connecting pipeline 100 and a compressor connecting pipeline 110. The first heat exchange pipeline of the regenerator structure is connected to the evaporator connecting pipeline 100 and the compressor connecting pipeline 110 at both ends. A heat dissipation refrigerant inlet is formed on the end of the evaporator connecting pipeline 100 remote from the first heat exchange pipeline, and a heat dissipation refrigerant outlet is formed on the end of the compressor connecting pipeline 110 remote from the first heat exchange pipeline. A solenoid valve is provided on the heat dissipation pipeline 1, preferably located between the heat dissipation refrigerant inlet and the refrigerant conversion unit 2. The gaseous refrigerant flowing from the outlet of the evaporator 4 into the evaporator connecting pipeline 100 is converted to liquid by the refrigerant conversion unit 2 and then transported to the interior of the electrical box 3 through the compressor connecting pipeline 110. The refrigerant in the heat dissipation pipeline 1 can exchange heat with the electrical box 3, dissipating heat within the electrical box. After completing heat exchange within the electrical box, the refrigerant then flows to the compressor 5 through the compressor connecting pipeline 110.

[0041] In the refrigeration system, a heat dissipation pipe extends from the evaporator 4, passes through a solenoid valve, and is led to the regenerator structure for heat exchange. It is then led to the electrical box 3 and finally returns to the compressor 5. Since the refrigerant leaving the evaporator 4 is in a gaseous state, the added regenerator structure can convert the gaseous refrigerant into a liquid refrigerant. This also prevents the low-temperature refrigerant on the evaporation side (the outlet side of the evaporator 4) from directly entering the electrical box 3, causing condensation or even frosting, which would affect the heat dissipation effect.

[0042] In order to further control the temperature difference of the refrigerant in the heat dissipation pipeline 1 before and after it enters the electrical box 3, as an optional implementation method of the embodiment of the present invention, the heat dissipation structure also includes an inlet temperature sensing portion and an outlet temperature sensing portion. The inlet temperature sensing portion is provided on the heat dissipation pipeline 1 near the inlet of the electrical box 3, and the outlet temperature sensing portion is provided on the heat dissipation pipeline 1 near the outlet of the electrical box 3. Both the inlet temperature sensing portion and the outlet temperature sensing portion in this embodiment adopt temperature sensors. The inlet temperature sensing portion detects the temperature of the refrigerant in the heat dissipation pipeline 1 before it enters the electrical box 3, and the outlet temperature sensing portion detects the temperature of the refrigerant in the heat dissipation pipeline 1 after it passes through the electrical box 3. According to the difference between the refrigerant temperature at the outlet of the electrical box 3 and the refrigerant temperature at the inlet of the electrical box 3, the opening of the electronic expansion valve between the outlet of the evaporator 4 and the compressor 5 in the refrigeration cycle is controlled to maintain a suitable temperature difference and maintain a good heat dissipation effect.

[0043] According to another aspect of the present invention, an electrical box 3 assembly is provided, comprising the electrical box 3 and the aforementioned heat dissipation structure. The electrical box 3 is provided with an inlet and an outlet for a heat dissipation pipe 1. The heat dissipation pipe 1, which is led out from the evaporation side, can enter the interior of the electrical box 3 through the inlet on the electrical box 3 to dissipate heat from major heat-generating components within the electrical box 3, such as the controller within the electrical box 3. Furthermore, the heat dissipation pipe 1 can pass through the outlet of the electrical box 3 and connect to a compressor 5. Refrigerant that has dissipated heat within the electrical box 3 can flow through the heat dissipation pipe 1 to the compressor 5, completing the heat dissipation cycle.

[0044] In other words, the evaporator 4, heat dissipation pipeline 1, solenoid valve, regenerator structure, and compressor 5 in this embodiment form a heat dissipation loop. This heat dissipation structure utilizes refrigerant heat dissipation to dissipate heat from the electrical box 3, avoiding the high failure rate of the cooling fan commonly associated with fan heat dissipation, thereby improving the reliability of the electrical box 3. It also overcomes the drawbacks of conventional refrigerant heat dissipation, which directly draws liquid from the condenser 7, resulting in higher liquid temperatures and lower heat exchange efficiency.

[0045] The present invention further provides a refrigeration device comprising the above-mentioned heat dissipation structure or the above-mentioned electrical appliance box 3 assembly. The refrigeration device also has the above-mentioned beneficial effects.

[0046] The refrigeration device also includes a compressor 5, a condenser 7, and an evaporator 4, which form a refrigeration cycle. The refrigerant at the outlet of the evaporator 4 flows through two branches to the compressor 5 and the heat dissipation pipeline 1, respectively. An electronic expansion valve, namely a first expansion valve 10, is provided between the outlet of the evaporator 4 and the air intake of the compressor 5. By controlling the opening of the first expansion valve 10, the temperature difference between the refrigerant at the inlet and outlet of the electrical box 3 can be better controlled.

[0047] In this embodiment, the compressor 5, oil separator 6, condenser 7, regenerator, liquid reservoir 8, filter 9, and evaporator 4 are connected by a single circuit to form a refrigeration cycle. An electronic expansion valve, serving as a second expansion valve 11, is provided in the pipeline between the filter 9 and the inlet of the evaporator 4.

[0048] In order to control the refrigerant temperature of the system, it is necessary to control the opening of the second expansion valve 11 through the superheat of the suction temperature and the evaporating temperature (the opening of the first expansion valve 10 can be kept unchanged when adjusting the second expansion valve 11). When the actual superheat (the difference between the suction temperature and the evaporating temperature) is greater than the target superheat, the opening of the second expansion valve 11 is reduced; when the actual superheat is less than the target superheat, the opening of the second expansion valve 11 is increased; when the actual superheat is equal to the target superheat, the opening of the second expansion valve 11 is kept unchanged.

[0049] The suction temperature refers to the refrigerant temperature on the suction side of the compressor 5. Figure 1The section between the medium and low pressure sensor 12 and the gas-liquid separator 13 is the suction side. A suction side temperature sensor can be set on this section of the pipeline to detect the refrigerant temperature on the suction side. Figure 1 The low pressure is calculated and converted from the low pressure detected by the low pressure sensor 12 in the refrigeration cycle.

[0050] Furthermore, in order to facilitate the control of the refrigerant temperature difference at the inlet and outlet of the electrical box 3, so as to maintain an appropriate temperature difference and a good heat dissipation effect, the present invention provides a heat dissipation control method, which uses the above-mentioned heat dissipation structure to dissipate heat from the electrical box 3. Figure 2 As shown, the control method includes:

[0051] S401, obtaining the inlet refrigerant temperature of the heat dissipation pipe 1 passing through the inlet of the electrical box 3 and the outlet refrigerant temperature of the heat dissipation pipe 1 passing through the outlet of the electrical box 3;

[0052] Among them, the inlet refrigerant temperature is set to T 进 The outlet refrigerant temperature is set to T 出 , measured by the outlet temperature sensing package 15 provided on the heat dissipation pipe 1 at the outlet of the electrical box 3.

[0053] S402: Control the refrigerant flow rate flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 according to the inlet refrigerant temperature and the outlet refrigerant temperature.

[0054] In one embodiment, the step of controlling the refrigerant flow rate flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 according to the inlet refrigerant temperature and the outlet refrigerant temperature includes:

[0055] Obtaining the temperature difference between the outlet refrigerant temperature and the inlet refrigerant temperature;

[0056] Compare the temperature difference with the target temperature difference;

[0057] The flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 is controlled according to the comparison result.

[0058] The above temperature difference is set as T 差 (T 差 =T 出 -T 进 ), the target temperature difference is set to T 目 When the electrical box 3 needs to dissipate heat, the solenoid valve on the heat dissipation pipeline 1 is opened to start heat dissipation, and the system synchronously detects the inlet refrigerant temperature and the outlet refrigerant temperature.

[0059] As an optional embodiment, the step of controlling the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 according to the comparison result includes:

[0060] If the temperature difference is greater than the target temperature difference, the refrigerant flow rate flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 is increased until the temperature difference is equal to the target temperature difference;

[0061] If the temperature difference is equal to the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 is kept unchanged;

[0062] If the temperature difference is less than the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 is reduced until the temperature difference is equal to the target temperature difference.

[0063] In this embodiment, the refrigerant at the outlet of the evaporator 4 flows to the compressor 5 and the heat dissipation pipeline 1 respectively through two branches. An electronic expansion valve (first expansion valve 10) is provided between the outlet of the evaporator 4 and the air intake of the compressor 5. The flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 is controlled by adjusting the opening of the first expansion valve 10. When adjusting the first expansion valve 10, the opening of the second expansion valve 11 can be kept unchanged. By reducing the opening of the first expansion valve 10, the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 can be increased; by increasing the opening of the first expansion valve 10, the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 can be reduced; and by keeping the opening of the first expansion valve 10 unchanged, the flow rate of the refrigerant flowing into the heat dissipation pipeline 1 through the outlet of the evaporator 4 can be kept unchanged.

[0064] Specific control methods such as Figure 3 As shown:

[0065] When T 差 >T 目 , control the first expansion valve 10 to open gradually until T 差 =T 目 ;

[0066] When T 差 =T 目 , control the first expansion valve 10 to maintain the original opening;

[0067] When T 差 <T 目 , control the first expansion valve 10 to open gradually until T 差 =T 目 .

[0068] During the heat dissipation period, the frequency of compressor 5 can be increased to meet the heat exchange on the evaporation side. When the output frequency of compressor 5 is a, when the heat dissipation is turned on, for example, the frequency of compressor 5 is corrected to 1.2a, the system automatically detects the frequency f of compressor 5 in real time. 实 , when a≤f 实≤1.2a, each correction is 0.05a, when f 实 When the value is greater than 1.2a, it can be adjusted by 0.1a each time.

[0069] By using the above-mentioned control method, the low-temperature refrigerant on the evaporation side is combined with the regenerator structure for heat exchange, and the refrigerant temperature can be adjusted to the desired value, so that the heat exchange temperature is maintained at an appropriate temperature, and it is suitable for high and low temperature working conditions and a wider range. By controlling the temperature difference of the refrigerant before and after entering the electrical box 3 through the first expansion valve 10 in the refrigeration cycle, and automatically debugging the frequency adjustment parameters of the compressor 5, the system refrigerant temperature can be used to dissipate heat to the maximum extent, thereby improving the heat exchange effect. In addition, the heat source in the electrical box 3 is mainly generated by the operation of the compressor 5. If the heat is very serious, the compressor 5 will reduce / limit the frequency to prevent a high temperature fault. The present invention mainly dissipates heat to the electrical box 3 through the refrigerant introduced from the evaporation side, and further controls the temperature of the refrigerant entering the electrical box 3 by controlling the electronic expansion valve, thereby avoiding the occurrence of frequency limiting or frequency reduction of the compressor 5.

[0070] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A heat dissipation structure, characterized in that: The heat dissipation device comprises a heat dissipation pipeline and a refrigerant conversion unit provided on the heat dissipation pipeline. The heat dissipation pipeline has a heat dissipation refrigerant inlet and a heat dissipation refrigerant outlet. The heat dissipation refrigerant inlet is connected to the outlet of the evaporator. The heat dissipation refrigerant outlet can pass through the electrical box and be connected to the compressor. The gaseous refrigerant flowing into the heat dissipation pipeline from the outlet of the evaporator can be converted into liquid by the refrigerant conversion unit and then transported to the electrical box to dissipate heat for the components in the electrical box. The refrigerant conversion part is a regenerator structure, which is connected to the outlet of the condenser. The refrigerant flowing to the heat dissipation pipeline through the outlet of the evaporator exchanges heat with the refrigerant flowing from the condenser into the regenerator structure in the regenerator structure. The regenerator structure has a first heat exchange pipeline and a second heat exchange pipeline that are not connected to each other. The first heat exchange pipeline of the regenerator structure is connected to the heat dissipation pipeline, and the refrigerant flowing out of the evaporator can be transported to the electrical box through the first heat exchange pipeline of the regenerator structure; the second heat exchange pipeline of the regenerator structure is connected to the refrigeration cycle circuit, and the refrigerant flowing out of the condenser can be transported to the evaporator through the second heat exchange pipeline of the regenerator; An electronic expansion valve is provided between the outlet of the evaporator and the air intake of the compressor, for controlling the flow of refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator.

2. The heat dissipation structure according to claim 1, characterized in that: The heat dissipation pipeline includes an evaporator connecting pipeline and a compressor connecting pipeline. The two ends of the first heat exchange pipeline of the regenerator structure are respectively connected to the evaporator connecting pipeline and the compressor connecting pipeline. The end of the evaporator connecting pipeline away from the first heat exchange pipeline is formed with the heat dissipation refrigerant inlet end, and the end of the compressor connecting pipeline away from the first heat exchange pipeline is formed with the heat dissipation refrigerant outlet end.

3. The heat dissipation structure according to claim 1, characterized in that: The heat dissipation pipeline is provided with a solenoid valve, and the solenoid valve is arranged between the heat dissipation refrigerant inlet end and the refrigerant conversion part.

4. The heat dissipation structure according to claim 1, characterized in that: The heat dissipation structure further includes an inlet temperature sensing portion and an outlet temperature sensing portion. The inlet temperature sensing portion is provided on the heat dissipation pipeline near the inlet of the electrical box, and the outlet temperature sensing portion is provided on the heat dissipation pipeline near the outlet of the electrical box.

5. The heat dissipation structure according to claim 1, characterized in that: The refrigerant conversion part adopts a microchannel heat exchanger or an economizer.

6. An electrical box assembly, characterized in that: The invention comprises an electrical box and the heat dissipation structure according to any one of claims 1 to 5, wherein the electrical box is provided with an inlet and an outlet for passing the heat dissipation pipeline, and the refrigerant in the heat dissipation pipeline can dissipate heat for the components in the electrical box.

7. A refrigeration device, characterized in that: It includes the heat dissipation structure according to any one of claims 1 to 5 or the electrical box assembly according to claim 6.

8. The refrigeration equipment according to claim 7, characterized in that The refrigeration equipment also includes a compressor, a condenser and an evaporator that form a refrigeration cycle loop. The refrigerant at the outlet of the evaporator flows to the compressor and the heat dissipation pipeline through two branches respectively. An electronic expansion valve is provided between the outlet of the evaporator and the air intake of the compressor.

9. A heat dissipation control method, characterized in that: The heat dissipation structure according to any one of claims 1 to 5 is used to dissipate heat from an electrical box, the method comprising: Obtaining the inlet refrigerant temperature of the heat dissipation pipe passing through the inlet of the electrical box and the outlet refrigerant temperature of the heat dissipation pipe passing through the outlet of the electrical box; The flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled according to the inlet refrigerant temperature and the outlet refrigerant temperature.

10. The method according to claim 9, characterized in that The step of controlling the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator according to the inlet refrigerant temperature and the outlet refrigerant temperature includes: Obtaining a temperature difference between the outlet refrigerant temperature and the inlet refrigerant temperature; Comparing the temperature difference with the target temperature difference; The flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled according to the comparison result.

11. The method according to claim 10, characterized in that The step of controlling the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator according to the comparison result includes: If the temperature difference is greater than the target temperature difference, the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator is increased until the temperature difference is equal to the target temperature difference; If the temperature difference is equal to the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is kept unchanged; If the temperature difference is less than the target temperature difference, the flow rate of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is reduced until the temperature difference is equal to the target temperature difference.

12. The method according to claim 9 or 11, characterized in that The refrigerant at the outlet of the evaporator flows to the compressor and the heat dissipation pipeline respectively through two branches. An electronic expansion valve is provided between the outlet of the evaporator and the air intake of the compressor. The flow of the refrigerant flowing into the heat dissipation pipeline through the outlet of the evaporator is controlled by adjusting the opening of the electronic expansion valve.

13. The method according to claim 12, characterized in that By controlling the opening of the electronic expansion valve to decrease, the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator can be increased; by controlling the opening of the electronic expansion valve to increase, the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator can be reduced; by controlling the opening of the electronic expansion valve to remain unchanged, the refrigerant flow rate flowing into the heat dissipation pipeline through the outlet of the evaporator can be kept unchanged.

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