Refrigerant circulation system and its control method and air conditioning equipment

Abstract

This invention relates to a refrigerant circulation system and its control method and air conditioning equipment. The refrigerant circulation system includes: a compressor (1); an electrical assembly (18) including an electrical component (5) electrically connected to the compressor (1); a condenser (14) connected to the exhaust port of the compressor (1); a first heat exchanger (4) configured to exchange heat with the electrical assembly (18) and connected to the condenser (14); a first throttling component (13) disposed in a pipeline connecting the condenser (14) and the first heat exchanger (4); a second throttling component (2) connected to the first heat exchanger (4) and located downstream of the first heat exchanger (4) along the refrigerant flow direction; and a control valve (11) including an inlet connected to the condenser (14) and an outlet connected to the first heat exchanger (4), wherein the control valve (11) bypasses the first throttling component (13), thereby improving the problem of condensation caused by excessively low temperature in the electrical assembly in the prior art.

Description

Technical Field

[0001] This invention relates to the field of engineering technology, and more specifically, to a refrigerant circulation system, its control method, and an air conditioning device. Background Technology

[0002] Integrated centrifugal compressors integrate the frequency converter into the compressor, saving the space of the on-board frequency converter. This makes the unit structure more compact and smaller in size, making integrated compressors the preferred solution for modular units.

[0003] In integrated compressors, components such as the motor, IGBTs in the frequency converter, switching power supply, and capacitors are heat-generating devices. Overheating of these components can lead to derating or even malfunction, rendering them unusable. To ensure reliable compressor operation, thermal management is necessary. Currently, a common cooling solution involves drawing high-pressure, high-temperature refrigerant from the unit's condenser, throttling it to lower its temperature, and then using this refrigerant to cool the aforementioned components. The refrigerant then enters a lower-pressure section of the unit. This solution provides a large cooling capacity, ensuring sufficient cooling and preventing overheating. However, because the refrigerant is at a lower temperature after throttling, its entry into the compressor's cooling structure results in a lower surface temperature. When the ambient temperature and humidity around the cooling structure are relatively high, condensation can occur. Condensation on electrical components can cause frequent compressor malfunctions, preventing normal operation and even leading to short circuits and severe damage. Summary of the Invention

[0004] The present invention aims to provide a refrigerant circulation system and its control method and air conditioning equipment to improve the problem of condensation in electrical components due to excessively low temperature in the prior art.

[0005] According to one aspect of the present invention, a refrigerant circulation system is provided, the refrigerant circulation system comprising:

[0006] compressor;

[0007] Electrical components, including electrical parts electrically connected to the compressor;

[0008] The condenser is connected to the compressor's exhaust port;

[0009] The first heat exchanger is configured to exchange heat with the electrical components and is connected to the condenser;

[0010] The first throttling component is installed in the pipeline connecting the condenser and the first heat exchanger;

[0011] The second throttling component is connected to the first heat exchanger and is located downstream of the first heat exchanger along the refrigerant flow direction; and

[0012] The control valve includes an inlet connected to the condenser and an outlet connected to the first heat exchanger, and the control valve bypasses the first throttling component.

[0013] In some embodiments, the refrigerant circulation system further includes:

[0014] The first temperature detection component is configured to detect the temperature t1 of the electrical component;

[0015] The controller is signal-connected to both the first temperature sensing element and the control valve, and is configured to:

[0016] When the control valve is in the open state and the temperature t1 ≤ target temperature T1, the control valve remains in the open state; or

[0017] When the control valve is open, temperature t1 > target temperature T1, and the second throttling component reaches its maximum opening, the control valve is closed and the first throttling component is opened; or

[0018] When the control valve is closed, temperature t1 ≤ target temperature T1, and the opening degree of the first throttling component is greater than the minimum opening degree, the control valve remains closed; or

[0019] The control valve is opened when the control valve is closed, the temperature t1 is less than the target temperature T1, and the opening of the first throttling component reaches its minimum.

[0020] In some embodiments, the first heat exchanger comes into contact with electrical components to cool and lower the temperature of the electrical components.

[0021] In some embodiments, the compressor includes a compression device and a motor driven by the compression device, and the electrical components include a motor control device electrically connected to the motor.

[0022] In some embodiments, the motor control device includes a frequency converter.

[0023] In some embodiments, the refrigerant circulation system further includes an air-cooled radiator that exchanges heat with electrical components.

[0024] In some embodiments, the electrical assembly further includes a housing for housing electrical components, and the air-cooled radiator includes a first portion located inside the housing for heat exchange with air inside the housing and a second portion located outside the housing for heat exchange with air outside the housing.

[0025] In some embodiments, the air-cooled radiator includes a first heat-conducting component, which includes a first portion that exchanges heat with the air inside the housing of the electrical components and a second portion located outside the housing and configured to exchange heat with the air outside the housing.

[0026] In some embodiments, the refrigerant circulation system further includes a second heat exchanger that uses throttled refrigerant to cool electrical components.

[0027] In some embodiments, the refrigerant circulation system further includes a water receiving component located below the second heat exchanger.

[0028] In some embodiments, the drain outlet of the water receiving component is provided with a liquid seal structure.

[0029] In some embodiments, the refrigerant circulation system further includes:

[0030] The second temperature detection component is configured to detect the temperature t2 within the housing space of the electrical assembly;

[0031] The third throttling component is installed in the pipeline connecting the second heat exchanger and the condenser;

[0032] The controller is signal-connected to the second temperature sensing component and the third throttling component respectively, and is configured to:

[0033] If the third throttling component is in the closed state and temperature t2 ≤ target temperature T2, then the third throttling component remains in the closed state; or

[0034] If the third throttling component is closed and temperature t2 > target temperature T2, then open the third throttling component; or

[0035] When the third throttling component is in the open state, temperature t2 ≤ target temperature T2, and the opening degree of the third throttling component is greater than the minimum opening degree, then the third throttling component remains in the open state; or

[0036] When the third throttling component is in the open state, the temperature t2 < the target temperature T2, and the opening degree of the third throttling component reaches the minimum opening degree, the third throttling component is closed.

[0037] In some embodiments, the second heat exchanger includes:

[0038] The second heat-conducting component includes a first part that exchanges heat with the air inside the housing of the electrical components and a second part that exchanges heat with the refrigerant.

[0039] The housing is configured to house a second portion of the second guide member therein and is connected to the condenser;

[0040] A third throttling component is installed in the piping connecting the condenser and the shell.

[0041] According to another aspect of the present invention, an air conditioning device is also provided, which includes the above-described refrigerant circulation system.

[0042] According to another aspect of the present invention, a control method for the above-described refrigerant circulation system is also provided, which, in some embodiments, includes:

[0043] Detect the temperature t1 of electrical components and the on / off status of control valves;

[0044] When the control valve is in the open state and the temperature t1 ≤ target temperature T1, the control valve remains in the open state; or

[0045] When the control valve is open, temperature t1 > target temperature T1, and the second throttling component reaches its maximum opening, the control valve is closed and the first throttling component is opened; or

[0046] When the control valve is closed, temperature t1 ≤ target temperature T1, and the opening degree of the first throttling component is greater than the minimum opening degree, the control valve remains closed; or

[0047] The control valve is opened when the control valve is closed, the temperature t1 is less than the target temperature T1, and the opening of the first throttling component reaches its minimum.

[0048] In some embodiments, the control method further includes:

[0049] The temperature t2 inside the housing of the electrical component is detected, as well as the switching status of the third throttling component installed in the pipeline connecting the second heat exchanger and condenser that are used to cool the housing of the electrical component.

[0050] If the third throttling component is in the closed state and temperature t2 ≤ target temperature T2, then the third throttling component remains in the closed state; or

[0051] If the third throttling component is closed and temperature t2 > target temperature T2, then open the third throttling component; or

[0052] When the third throttling component is in the open state, temperature t2 ≤ target temperature T2, and the opening degree of the third throttling component is greater than the minimum opening degree, then the third throttling component remains in the open state; or

[0053] When the third throttling component is in the open state, the temperature t2 < the target temperature T2, and the opening degree of the third throttling component reaches the minimum opening degree, the third throttling component is closed.

[0054] By applying the technical solution of this application, when the control valve is closed, the refrigerant output from the condenser evaporates in the first heat exchanger after being throttled by the first throttling component, thus cooling the electrical components; when the control valve is open, the refrigerant condensed in the condenser flows to the first heat exchanger through the control valve to cool the electrical components. The refrigerant circulation system of this embodiment can adjust the temperature of the refrigerant used to cool the electrical components, which helps to solve the problem of condensation caused by the low temperature of the electrical components.

[0055] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 A schematic diagram of the refrigerant circulation system according to an embodiment of the present invention is shown. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] like Figure 1 As shown, the refrigerant circulation system of this embodiment includes a compressor 1, an electrical component 18, a first heat exchanger 4, a first throttling component 13, a second throttling component 2, and a control valve 11.

[0060] Electrical assembly 18 includes electrical component 5 electrically connected to compressor 1; condenser 14 is connected to the exhaust port of compressor 1; first heat exchanger 4 is configured to exchange heat with electrical assembly 18 and is connected to condenser 14; first throttling component 13 is disposed in the pipeline connecting condenser 14 and first heat exchanger 4; second throttling component 2 is connected to first heat exchanger 4 and is located downstream of first heat exchanger 4 in the direction of refrigerant flow; control valve 11 includes an inlet connected to condenser 14 and an outlet connected to first heat exchanger 4, and control valve 11 bypasses first throttling component 13.

[0061] In this embodiment, when the control valve 11 is closed, the refrigerant output from the condenser 14 is throttled by the first throttling component 13 and evaporates in the first heat exchanger 4 to cool the electrical components 5; when the control valve 11 is open, the refrigerant condensed in the condenser 14 flows through the control valve 11 to the first heat exchanger 4 to cool the electrical components 5. The refrigerant circulation system in this embodiment can adjust the temperature of the refrigerant used to cool the electrical components 5, which helps to solve the problem of condensation caused by the low temperature of the electrical components 5.

[0062] The refrigerant circulation system also includes a bypass throttling component 3 that is connected to and parallel to the second throttling component 2.

[0063] The refrigerant circulation system also includes an evaporator 19, and in some embodiments, the outlets of the second throttling component 2 and / or the bypass throttling component 3 are connected to the evaporator 19. The outlet of the evaporator 19 is connected to the suction port of the compressor 1 to deliver the refrigerant evaporated in the evaporator 19 to the compressor 1 for recompression.

[0064] In this embodiment, the refrigerant flow path for cooling the electrical component 5 has two operating modes.

[0065] In the first operating mode, the first throttling component 13 is closed, and the refrigerant flow path is: condenser 14—control valve 11—first heat exchanger 4—second throttling component 2 and / or bypass throttling component 3—evaporator 19. The second throttling component 2 regulates the refrigerant flow, while the bypass throttling component 3 assists in increasing the refrigerant flow. If the flow from the second throttling component 2 is sufficient, the bypass throttling component 3 can be removed. The working principle of the refrigerant flow path is as follows: liquid refrigerant is drawn from the condenser 14, passes through the control valve 11, and enters the first heat exchanger 4. The refrigerant exchanges heat with the electrical components 5 through the first heat exchanger 4, cooling the electrical components 5. Then, the refrigerant passes through the second throttling component 2 and / or bypass throttling component 3, and finally enters the evaporator 19. The advantage of this cooling mode is that the refrigerant entering the first heat exchanger 4 is not throttled and has a higher temperature, which avoids condensation caused by excessively low temperatures in the electrical components 5, thus meeting the requirements for low-power operation of the compressor 1.

[0066] In the second operating mode, control valve 11 is closed, and the refrigerant flow path is: condenser 14—first throttling component 13—first heat exchanger 4—second throttling component 2 and / or bypass throttling component 3—evaporator. The working principle of the refrigerant flow path is as follows: liquid refrigerant is drawn from the condenser, throttled and cooled by the first throttling component 13, and then enters the first heat exchanger 4. The refrigerant exchanges heat with the electrical components 5 through the first heat exchanger 4, cooling the electrical components 5. Then, the refrigerant passes through the second throttling component 2 and / or bypass throttling component 3, finally entering the evaporator 19. The first throttling component 13 functions to throttle and regulate the cooling capacity, adjusting its opening according to the cooling demand. The advantage of this cooling mode is that a lower temperature refrigerant is obtained after throttling by the first throttling component 13, fully utilizing the latent heat of the refrigerant and achieving a larger cooling capacity to meet the high-power operation of the compressor.

[0067] The refrigerant circulation system also includes a first temperature detection component and a controller. The first temperature detection component is configured to detect the temperature t1 of the electrical component 5; the controller is signal-connected to the first temperature detection component and the control valve 11 respectively, and is configured to:

[0068] When the control valve 11 is in the open state and the temperature t1 ≤ the target temperature T1, the control valve 11 is kept in the open state so that the refrigerant flow path for cooling the electrical components 5 operates in the first working mode described above.

[0069] When the control valve 11 is open, the temperature t1 > the target temperature T1, and the opening degree of the second throttling component 2 reaches the maximum opening degree, the control valve 11 is closed and the first throttling component 13 is opened, so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0070] When the control valve 11 is closed, the temperature t1 ≤ the target temperature T1, and the opening degree of the first throttling component 13 is greater than the minimum opening degree, the control valve 11 is kept closed so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0071] When the control valve 11 is closed, the temperature t1 < the target temperature T1, and the opening degree of the first throttling component 13 reaches the minimum opening degree, the control valve 11 is opened so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0072] In some embodiments, the first heat exchanger 4 abuts against the electrical component 5 to cool the electrical component 5.

[0073] In some embodiments, the compressor 1 includes a compression device and a motor driven by the compression device, and the electrical component 5 includes a motor control device electrically connected to the motor. In some embodiments, the motor control device includes a frequency converter.

[0074] The refrigerant circulation system also includes an air-cooled radiator 6 that exchanges heat with the electrical components 18.

[0075] In some embodiments, the electrical assembly 18 further includes a housing for accommodating the electrical component 5, and the air-cooled radiator 6 includes a first portion located inside the housing for heat exchange with the air inside the housing and a second portion located outside the housing for heat exchange with the air outside the housing.

[0076] In some embodiments, the air-cooled radiator 6 includes a first heat-conducting component, which includes a first portion that exchanges heat with the air inside the housing of the electrical assembly 18 and a second portion located outside the housing and configured to exchange heat with the air outside the housing. The second portion of the first heat-conducting component exchanges heat with the air outside the housing, and the second portion employs a method of dissipating heat into the air outside the housing. In some embodiments, the first heat-conducting component is a heat pipe that exchanges heat with the air outside the housing (natural cooling).

[0077] The refrigerant circulation system also includes a second heat exchanger 9 that uses throttled refrigerant to cool the electrical component 18. The second heat exchanger 9 cools the space inside the housing of the electrical component 18.

[0078] The refrigerant circulation system also includes a fan 7 for driving the air-to-air radiator 6 and the second heat exchanger 9 within the electrical assembly 18.

[0079] The refrigerant circulation system also includes a water receiving component 12 located below the second heat exchanger 9. The drain outlet of the water receiving component 12 is equipped with a liquid seal structure. The liquid seal principle is used to seal the housing of the electrical assembly 18, preventing external air from entering the housing space, thus achieving a sealing function.

[0080] The second heat exchanger 9 includes a second heat-conducting component 8 and a housing. The second heat-conducting component includes a first part that exchanges heat with the air inside the housing of the electrical assembly 18 and a second part that exchanges heat with the refrigerant. The housing is configured to house the second part of the second heat-conducting component 8 therein and is connected to the condenser 14. A third throttling component 10 is provided in the pipeline connecting the condenser 14 and the housing.

[0081] In some embodiments, the second heat-conducting component 8 is a heat pipe, a portion of which exchanges heat with the refrigerant inside the aforementioned housing to achieve cooling.

[0082] The system for cooling the space inside the housing of electrical component 18 has three operating modes.

[0083] In the first operating mode, the third throttling component 10 is closed, and the fan 7 is turned on. The fan circulates the hot air within the housing of the electrical component 18, allowing heat exchange between the hot air and the air-cooled radiator 6. The air-cooled radiator 6 dissipates the heat from the housing of the electrical component 18 into the environment, thereby cooling the housing of the electrical component 18. The advantage of this cooling mode is that it utilizes natural cooling, eliminating the need to rely on the unit's own cooling capacity, thus improving the unit's energy efficiency.

[0084] In the second operating mode, the third throttling component 10 is open, and the fan 7 is on. The refrigerant flow path is: condenser 14 — third throttling component 10 — shell of the second heat exchanger 9 — second heat-conducting component 8 — evaporator 19. The working principle of the refrigerant flow path is as follows: liquid refrigerant is drawn from the condenser 14, throttled and cooled by the third throttling component 10, and then enters the shell of the second heat exchanger 9. The refrigerant exchanges heat with the second part of the second heat-conducting component 8 within the shell of the second heat exchanger 9, cooling the second heat-conducting component 8. The first part of the second heat-conducting component 8 exchanges heat with the hot air inside the casing of the electrical assembly 18, cooling the space inside the casing of the compressor 1 electrical assembly. Finally, the refrigerant enters the evaporator. The third throttling component 10 functions to throttle and regulate the cooling capacity, adjusting its opening degree according to the cooling demand. The advantage of this cooling mode is that a lower temperature refrigerant is obtained after throttling by the third throttling component 10, fully utilizing the latent heat of the refrigerant and achieving a larger cooling capacity.

[0085] In the third operating mode, when the humidity inside the housing of electrical component 18 is high, the dehumidification mode (third operating mode) can be activated to reduce the humidity of the space and prevent condensation on the internal electrical components. The refrigerant flow path is as follows: condenser 14—third throttling component 10—shell of second heat exchanger 9—second heat-conducting component 8—evaporator, with fan 7 turned on. The cooling circuit works by taking liquid refrigerant from condenser 14, throttling and cooling it through the third throttling component 10, and then entering the shell of the second heat exchanger 9. The refrigerant exchanges heat in the liquid-cooled space and above the second heat-conducting component 8, thus cooling the second heat-conducting component 8. Because the refrigerant temperature is lower after throttling, and the heat pipe has a constant temperature, the second heat-conducting component 8 can obtain a lower temperature after heat exchange with the refrigerant. When the hot and humid air inside the housing of electrical component 18 comes into contact with the cooler second heat-conducting component 8, the water vapor in the hot air condenses on the surface of the second heat-conducting component 8, thereby achieving dehumidification and reducing the humidity in the space. After the condensate accumulates, it is discharged through the condensate drainage seal 12. The condensate drainage seal 12 uses the principle of liquid sealing to prevent external air from entering the space of the electrical component 18, thus playing a sealing role.

[0086] As the compressor's operating power changes, the heat generated by electrical component 5 also changes. Based on the change in heat generation, different cooling control modes are activated.

[0087] The refrigerant circulation system also includes a second temperature detection component, a third throttling component 10, and a controller. The second temperature detection component is configured to detect the temperature t2 within the housing space of the electrical assembly 18; the third throttling component 10 is disposed in the pipeline connecting the second heat exchanger 9 and the condenser 14; the controller is signal-connected to the second temperature detection component and the third throttling component 10 respectively, and is configured to:

[0088] When the third throttling component 10 is in the closed state and the temperature t2 ≤ the target temperature T2, the third throttling component 10 is kept in the closed state so that the system for cooling the space inside the electrical component 18 operates in the first working mode described above.

[0089] When the third throttling component 10 is in the closed state and the temperature t2 > the target temperature T2, the third throttling component 10 is opened so that the system for cooling the space inside the electrical component 18 operates in the second working mode described above.

[0090] When the third throttling component 10 is in the open state, the temperature t2 ≤ the target temperature T2, and the opening degree of the third throttling component 10 is greater than the minimum opening degree, the third throttling component 10 is kept in the open state so that the system for cooling the space inside the electrical component 18 operates in the second working mode described above.

[0091] When the third throttling component 10 is in the open state, the temperature t2 is less than the target temperature T2, and the opening degree of the third throttling component 10 reaches the minimum opening degree, the third throttling component 10 is closed so that the system for cooling the space inside the electrical component 18 operates in the first working mode described above.

[0092] The refrigerant circulation system also includes a flash evaporator 16, a fourth throttling component 15 in the pipeline connecting the flash evaporator 16 and the condenser 14, and a fifth throttling component 17 in the pipeline connecting the flash evaporator 16 and the evaporator 19.

[0093] The control methods for the aforementioned refrigerant circulation system include:

[0094] The temperature t1 of the electrical component 5 and the on / off status of the control valve 11 are detected;

[0095] When the control valve 11 is open, the temperature t1 > the target temperature T1, and the opening degree of the second throttling component 2 reaches the maximum opening degree, the control valve 11 is closed and the first throttling component 13 is opened, so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0096] When the control valve 11 is closed, the temperature t1 ≤ the target temperature T1, and the opening degree of the first throttling component 13 is greater than the minimum opening degree, the control valve 11 is kept closed so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0097] When the control valve 11 is closed, the temperature t1 < the target temperature T1, and the opening degree of the first throttling component 13 reaches the minimum opening degree, the control valve 11 is opened so that the refrigerant flow path for cooling the electrical component 5 operates in the second working mode described above.

[0098] Control methods also include:

[0099] The temperature t2 inside the housing space of the electrical component 18 is detected, as well as the on / off status of the third throttling component 10 installed in the pipeline connecting the second heat exchanger 9 and the condenser 14, which are used to cool the housing space of the electrical component 18.

[0100] When the third throttling component 10 is in the closed state and the temperature t2 ≤ the target temperature T2, the third throttling component 10 is kept in the closed state so that the system for cooling the space inside the electrical component 18 operates in the first working mode described above.

[0101] When the third throttling component 10 is in the closed state and the temperature t2 > the target temperature T2, the third throttling component 10 is opened so that the system for cooling the space inside the electrical component 18 operates in the second working mode described above.

[0102] When the third throttling component 10 is in the open state, the temperature t2 ≤ the target temperature T2, and the opening degree of the third throttling component 10 is greater than the minimum opening degree, the third throttling component 10 is kept in the open state so that the system for cooling the space inside the electrical component 18 operates in the second working mode described above.

[0103] When the third throttling component 10 is in the open state, the temperature t2 is less than the target temperature T2, and the opening degree of the third throttling component 10 reaches the minimum opening degree, the third throttling component 10 is closed so that the system for cooling the space inside the electrical component 18 operates in the first working mode described above.

[0104] In some embodiments, a humidity sensor is installed inside the housing of the electrical component 18, and the controller is connected to the humidity sensor to activate the dehumidification mode when the detected humidity value is greater than a predetermined value, or to periodically activate the dehumidification mode to ensure low humidity inside the compressor electrical housing space 18 and avoid condensation problems.

[0105] By combining the cooling and dehumidification modes, the temperature of the inverter's heating components and the compressor's electrical box is kept within a suitable range, and the humidity within the compressor's electrical box is controlled, thus effectively managing the compressor's thermal performance and ensuring its safe and reliable operation.

[0106] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A refrigerant circulation system, characterized in that, include: Compressor (1); Electrical assembly (18) includes electrical components (5) electrically connected to the compressor (1); The condenser (14) is connected to the exhaust port of the compressor (1); The first heat exchanger (4) is configured to exchange heat with the electrical assembly (18) and is connected to the condenser (14); The first throttling component (13) is disposed in the pipeline connecting the condenser (14) and the first heat exchanger (4); The second throttling component (2) is connected to the first heat exchanger (4) and is located downstream of the first heat exchanger (4) along the refrigerant flow direction; and The control valve (11) includes an inlet connected to the condenser (14) and an outlet connected to the first heat exchanger (4), the control valve (11) bypassing the first throttling component (13). The refrigerant circulation system also includes a second heat exchanger (9) that uses the throttled refrigerant to cool down the electrical components (18). The refrigerant circulation system also includes a water receiving component (12) located below the second heat exchanger (9).

2. The refrigerant circulation system according to claim 1, characterized in that, Also includes: The first temperature detection component is configured to detect the temperature t1 of the electrical component (5); The controller is signal-connected to the first temperature detection component and the control valve (11) respectively, and is configured to: When the control valve (11) is in the open state and the temperature t1 ≤ target temperature T1, the control valve (11) remains in the open state; or When the control valve (11) is open, the temperature t1 > the target temperature T1, and the opening degree of the second throttling component (2) reaches the maximum opening degree, then the control valve (11) is closed and the first throttling component (13) is opened; or When the control valve (11) is closed, the temperature t1 ≤ target temperature T1, and the opening degree of the first throttling component (13) is greater than the minimum opening degree, the control valve (11) remains closed; or When the control valve (11) is closed, the temperature t1 < the target temperature T1, and the opening degree of the first throttling component (13) reaches the minimum opening degree, the control valve (11) is opened.

3. The refrigerant circulation system according to claim 1, characterized in that, The first heat exchanger (4) abuts against the electrical component (5) to cool down the electrical component (5).

4. The refrigerant circulation system according to claim 1, characterized in that, The compressor (1) includes a compression device and a motor that is driven and connected to the compression device, and the electrical component (5) includes a motor control device that is electrically connected to the motor.

5. The refrigerant circulation system according to claim 4, characterized in that, The motor control device includes a frequency converter.

6. The refrigerant circulation system according to claim 1, characterized in that, It also includes an air-cooled radiator (6) that exchanges heat with the electrical components (18).

7. The refrigerant circulation system according to claim 6, characterized in that, The electrical assembly (18) also includes a housing for accommodating the electrical component (5), and the air-cooled radiator (6) includes a first part located inside the housing for heat exchange with the air inside the housing and a second part located outside the housing for heat exchange with the air outside the housing.

8. The refrigerant circulation system according to claim 7, characterized in that, The air-cooled radiator (6) includes a first heat-conducting component, which includes a first portion that exchanges heat with the air inside the housing of the electrical assembly (18) and a second portion located outside the housing and configured to exchange heat with the air outside the housing.

9. The refrigerant circulation system according to claim 1, characterized in that, The drain outlet of the water receiving component (12) is equipped with a liquid seal structure.

10. The refrigerant circulation system according to claim 1, characterized in that, Also includes: The second temperature detection component is configured to detect the temperature t2 within the housing space of the electrical component (18); The third throttling component (10) is disposed in the pipeline connecting the second heat exchanger (9) and the condenser (14); The controller is signal-connected to the second temperature detection component and the third throttling component (10) respectively, and is configured to: If the third throttling component (10) is in the closed state and the temperature t2 ≤ target temperature T2, then the third throttling component (10) remains in the closed state; or If the third throttling component (10) is in the closed state and the temperature t2 > the target temperature T2, then the third throttling component (10) is opened; or When the third throttling component (10) is in the open state, the temperature t2 ≤ the target temperature T2, and the opening degree of the third throttling component (10) is greater than the minimum opening degree, then the third throttling component (10) remains in the open state; or When the third throttling component (10) is in the open state, the temperature t2 is less than the target temperature T2, and the opening degree of the third throttling component (10) reaches the minimum opening degree, the third throttling component (10) is closed.

11. The refrigerant circulation system according to claim 1, characterized in that, The second heat exchanger (9) includes: The second heat-conducting component (8) includes a first part that exchanges heat with the air inside the housing of the electrical assembly (18) and a second part that exchanges heat with the refrigerant; The housing is configured to house a second portion of the second heat-conducting component (8) therein and is connected to the condenser (14); A third throttling component (10) is provided in the pipeline connecting the condenser (14) and the shell.

12. An air conditioning device, characterized in that, The refrigerant circulation system includes any one of claims 1 to 11.

13. A control method for a refrigerant circulation system according to any one of claims 1 to 11, characterized in that, include: The temperature t1 of the electrical component (5) and the on / off state of the control valve (11) are detected; When the control valve (11) is in the open state and the temperature t1 ≤ target temperature T1, the control valve (11) remains in the open state; or When the control valve (11) is open, the temperature t1 > the target temperature T1, and the opening degree of the second throttling component (2) reaches the maximum opening degree, then the control valve (11) is closed and the first throttling component (13) is opened; or When the control valve (11) is closed, the temperature t1 ≤ target temperature T1, and the opening degree of the first throttling component (13) is greater than the minimum opening degree, the control valve (11) remains closed; or When the control valve (11) is closed, the temperature t1 < the target temperature T1, and the opening degree of the first throttling component (13) reaches the minimum opening degree, the control valve (11) is opened.

14. The control method according to claim 13, characterized in that, Also includes: The temperature t2 inside the housing space of the electrical component (18) and the switching status of the third throttling component (10) installed in the pipeline connecting the second heat exchanger (9) and the condenser (14) for cooling the housing space of the electrical component (18) are detected. If the third throttling component (10) is in the closed state and the temperature t2 ≤ target temperature T2, then the third throttling component (10) remains in the closed state; or If the third throttling component (10) is in the closed state and the temperature t2 > the target temperature T2, then the third throttling component (10) is opened; or When the third throttling component (10) is in the open state, the temperature t2 ≤ the target temperature T2, and the opening degree of the third throttling component (10) is greater than the minimum opening degree, then the third throttling component (10) remains in the open state; or When the third throttling component (10) is in the open state, the temperature t2 is less than the target temperature T2, and the opening degree of the third throttling component (10) reaches the minimum opening degree, the third throttling component (10) is closed.

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