Hermetic frequency converter cabinet and its heat dissipation device

Abstract

This utility model relates to the field of frequency converter cabinets, and discloses a sealed frequency converter cabinet and a heat dissipation device for the sealed frequency converter cabinet, comprising: a refrigerant cooling system; a cooling system, the cooling system including at least a cooling circuit and a water-cooled heat exchanger disposed within the sealed frequency converter cabinet; the water-cooled heat exchanger including heat dissipation fins and a fan disposed on one side of the heat dissipation fins; the inlet of the cooling circuit is connected to the outlet of the refrigerant cooling system, and the outlet of the cooling circuit is simultaneously connected to the inlet of the heat dissipation fins and the inlet of the refrigerant cooling system; the outlet of the heat dissipation fins is connected to the inlet of the refrigerant cooling system; the fan is used to drive the air inside the sealed frequency converter cabinet to flow through the heat dissipation fins and the air-cooled heat dissipation devices inside the sealed frequency converter cabinet, and to circulate the air inside the cabinet. In this utility model, there is no need to open ventilation openings on the frequency converter cabinet body, thereby avoiding the problem of deterioration of the protection performance of the frequency converter cabinet.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter cabinets, and in particular to a sealed frequency converter cabinet and a heat dissipation device for the sealed frequency converter cabinet. Background Technology

[0002] With the development of technology, the demand for high-power integrated frequency converter cabinets is increasing. Heat dissipation is crucial for frequency converter cabinets, directly affecting their performance and lifespan. The main heat dissipation methods for frequency converter cabinets include natural air cooling, forced air cooling, and water cooling. While these methods solve the heat dissipation problem to some extent, they each have their shortcomings: natural air cooling has low heat dissipation efficiency, making it difficult to meet the high heat dissipation efficiency requirements of power electronic equipment. Forced air cooling significantly improves heat dissipation efficiency compared to natural air cooling, but it generates significant fan noise and has low reliability during the cooling process. From a heat dissipation perspective, water cooling is the most ideal method, but it requires an additional water circulation system, which is costly, has high process requirements, and is complex to install. Refrigerant-based phase change cooling, on the other hand, has advantages such as high heat dissipation efficiency and eliminates the need for an additional cooling system, making it more suitable for applications in the central air conditioning industry.

[0003] In related technologies, frequency converter cabinets only use a small amount of refrigerant for heat dissipation, which involves the refrigerant flowing within the cooling plate to remove heat from the main working components of the frequency converter cabinet. For heat dissipation of other components inside the frequency converter cabinet, such as reactors, copper busbars, and transformers, fans are installed on the outside of the cabinet to remove heat. Because the operation of the cabinet fans requires air inlets and outlets on the cabinet, it is difficult to improve the protection level of the frequency converter cabinet. Utility Model Content

[0004] The purpose of this utility model is to provide a sealed frequency converter cabinet and its heat dissipation device. This device dissipates heat from the heat-generating components without the need to open ventilation openings on the frequency converter cabinet body, thus preventing dust and moisture from entering the cabinet body and avoiding the problem of deterioration of the protection performance of the frequency converter cabinet.

[0005] To solve the above-mentioned technical problems, the present invention provides a heat dissipation device for a sealed frequency converter cabinet, comprising: a refrigerant cooling system; a cooling system, the cooling system including at least a cooling circuit and a water-cooled heat exchanger disposed within the sealed frequency converter cabinet; the water-cooled heat exchanger including heat dissipation fins and a fan disposed on one side of the heat dissipation fins; the inlet of the cooling circuit being connected to the outlet of the refrigerant cooling system, the outlet of the cooling circuit being connected to both the inlet of the heat dissipation fins and the inlet of the refrigerant cooling system; the outlet of the heat dissipation fins being connected to the inlet of the refrigerant cooling system; and the fan being used to drive air within the sealed frequency converter cabinet to flow through the heat dissipation fins and the air-cooled heat dissipation devices within the sealed frequency converter cabinet, and to circulate the air within the cabinet.

[0006] Compared to related technologies, the heat dissipation device of this invention's sealed inverter cabinet includes a cooling system inside the cabinet and a refrigerant cooling system outside the cabinet. The cooling system has a cooling circuit in which the refrigerant circulates. During normal operation, the heat dissipation fins of the air-water heat exchanger are connected to the cooling circuit and can receive low-temperature refrigerant. The fan of the air-water heat exchanger causes the high-temperature air inside the cabinet to flow through the heat dissipation fins, allowing the air to exchange heat with the low-temperature refrigerant inside the fins, thus lowering the air temperature. The cooled air circulates inside the cabinet under the drive of the fan, ensuring that the heat-generating components are surrounded by low-temperature airflow, thereby reducing the overall air temperature inside the cabinet. In this way, external air does not need to participate in the circulation, and the inverter cabinet does not need to have ventilation openings, effectively preventing dust and moisture from entering the cabinet. Subsequently, the high-temperature refrigerant heated by the air inside the heat dissipation fins of the air-water heat exchanger is transferred to the refrigerant cooling system through the cooling circuit. After the refrigerant in the circuit pipe is cooled by the refrigerant outside the cabinet, the refrigerant flows back into the heat dissipation fins, ensuring that the refrigerant inside the heat dissipation fins is always at a low temperature. Attached Figure Description

[0007] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the heat dissipation device of a sealed frequency converter cabinet provided in an embodiment of this application;

[0009] Figure 2 This is a schematic diagram of the pipe connection of the heat dissipation device of the sealed frequency converter cabinet provided in one embodiment of this application;

[0010] Figure 3 This is a schematic diagram of the internal structure of a sealed frequency converter cabinet provided in an embodiment of this disclosure;

[0011] Figure 4 A schematic diagram of the cooling pipe structure of a closed-type frequency converter cabinet provided in an embodiment of this disclosure;

[0012] Figure 5 This is a structural schematic diagram of a sealed frequency converter cabinet provided in one embodiment of the present disclosure.

[0013] Explanation of reference numerals: 1. Variable frequency drive cabinet door; 2. Variable frequency drive cabinet body; 3. Rectifier cold plate; 3-1. Rectifier cold plate inlet; 3-2. Rectifier cold plate outlet; 4. Inverter cold plate; 4-1. Inverter cold plate inlet; 4-2. Inverter cold plate outlet; 5. Air-water heat exchanger; 5-1. Air-water heat exchanger inlet; 5-2. Air-water heat exchanger outlet; 6. Fan; 7. Cabinet internal component 1; 8. Cabinet internal component 2; 9-1. Inverter cold plate outlet pipe; 9-2. Air-water heat exchanger outlet pipe; 9-3. Connecting pipe; 10-1. Electronic expansion valve; 10-2. Solenoid valve 2; 10-3. Solenoid valve 1. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0015] As can be seen from the background technology, the heat dissipation devices of current sealed frequency converter cabinets often have problems that affect the airtightness of the frequency converter cabinet.

[0016] In related technologies, frequency converter cabinets only use a small amount of refrigerant for heat dissipation, which involves the refrigerant flowing within the cooling plate to remove heat from the main working components of the frequency converter cabinet. For heat dissipation of other components inside the frequency converter cabinet, such as reactors, copper busbars, and transformers, fans are installed on the outside of the cabinet to remove heat. Because the operation of the cabinet fans requires air inlets and outlets on the cabinet, it is difficult to improve the protection level of the frequency converter cabinet.

[0017] This utility model provides a sealed inverter cabinet and a heat dissipation device for the sealed inverter cabinet. The heat dissipation device for the sealed inverter cabinet includes a cooling system inside the cabinet and a refrigerant cooling system outside the cabinet. The cooling system has a cooling circuit in which the refrigerant circulates. During normal operation, the heat dissipation fins of the air-water heat exchanger are connected to the cooling circuit and can be connected to the low-temperature refrigerant. The fan of the air-water heat exchanger causes the high-temperature air inside the cabinet to flow through the heat dissipation fins, so that the air exchanges heat with the low-temperature refrigerant inside the fins, reducing the air temperature. The cooled air circulates inside the cabinet under the drive of the fan, ensuring that the heat-generating components are surrounded by low-temperature airflow, thereby reducing the overall air temperature inside the cabinet. In this way, external air does not need to participate in the circulation, and the inverter cabinet does not need to have ventilation openings, effectively preventing dust and moisture from entering the cabinet. Afterwards, the high-temperature refrigerant heated by the air inside the heat dissipation fins of the air-water heat exchanger is transferred to the refrigerant cooling system through the cooling circuit. The refrigerant cooling system outside the cabinet cools the refrigerant in the loop pipes, and then the refrigerant flows back into the heat sink fins, ensuring that the refrigerant inside the heat sink fins is always at a low temperature. The heat dissipation device of the sealed frequency converter cabinet disclosed in this utility model can effectively avoid the problem of deterioration in the protection performance of the frequency converter cabinet.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] Please refer to Figure 1 , Figure 2and Figure 1 , Figure 1 This is a schematic diagram of the heat dissipation device of a sealed frequency converter cabinet provided in an embodiment of this disclosure. Figure 2 This is a schematic diagram of the piping connection of the heat dissipation device of a sealed frequency converter cabinet according to an embodiment of this disclosure. Figure 3 This is a schematic diagram of the internal structure of a sealed frequency converter cabinet provided in one embodiment of the present disclosure.

[0022] This application provides a heat dissipation device for a hermetically sealed frequency converter cabinet, comprising a cooling system and a refrigerant cooling system. The cooling system is housed within the cabinet of the hermetically sealed frequency converter cabinet, while the refrigerant cooling system is located outside the cabinet. The cooling system and the refrigerant cooling system are connected in series, with the inlet of the cooling system linked to the outlet of the refrigerant cooling system, and the outlet of the cooling system connected to the inlet of the refrigerant cooling system.

[0023] Specifically, the cooling system is located within the enclosure of the sealed frequency converter cabinet. The refrigerant, after being cooled by the refrigerant cooling system, is then introduced into the cooling system. The cooling system uses the introduced refrigerant to cool the various heat-generating components of the sealed frequency converter cabinet. These heat-generating components include at least the air-cooled heat dissipation components, such as… Figure 3 The cabinet contains internal components 1 (7) and 2 (8), an inverter power module, and a rectifier power module.

[0024] like Figure 1 As shown, in this embodiment, the cooling system includes at least a cooling circuit and a water-cooled heat exchanger (5) installed in a sealed frequency converter cabinet. The cooling circuit is used to transfer refrigerant. The water-cooled heat exchanger (5) includes heat dissipation fins and a fan (6) installed on one side of the heat dissipation fins. The inlet of the cooling circuit is connected to the outlet of the refrigerant cooling system, and the outlet of the cooling circuit is connected to both the inlet of the heat dissipation fins and the inlet of the refrigerant cooling system. The outlet of the heat dissipation fins is connected to the inlet of the refrigerant cooling system.

[0025] Specifically, the cooling circuit inlet is connected to the refrigerant cooling system via a connecting pipe (9-3) to obtain the low-temperature refrigerant input by the refrigerant cooling system through the connecting pipe (9-3); the cooling circuit outlet is connected to the heat dissipation fins of the air-water heat exchanger (5) via a connecting pipe (9-3) to supply the obtained low-temperature refrigerant to the heat dissipation fins; the cooling circuit outlet is also connected to the refrigerant cooling system via a connecting pipe (9-3), and the heat dissipation fin outlet is also connected to the refrigerant cooling system via a connecting pipe (9-3), so that the refrigerant cooling system cools the refrigerant in the pipe.

[0026] The air-water heat exchanger (5) is used to dissipate heat from the heat dissipation devices to be cooled in the sealed inverter cabinet and to circulate the air inside the cabinet. The heat dissipation area of ​​the heat dissipation fins of the air-water heat exchanger (5) is larger than that of ordinary plate heat sinks, resulting in better heat dissipation effect and faster heat dissipation speed. The fan (6) is fixedly connected to one side of the heat dissipation fins. When the fan (6) is started, the fan (6) blows the high-temperature air that has absorbed the heat-generating devices in the sealed inverter cabinet to the heat dissipation fins. The heat dissipation fins absorb the heat in the high-temperature air, and the high-temperature air is cooled to low-temperature air. The fan (6) then blows the low-temperature air to other spaces inside the sealed inverter cabinet to achieve cooling inside the sealed inverter cabinet.

[0027] In this embodiment, the cooling circuit includes an inverter cooling circuit and a rectifier cooling circuit; wherein, the rectifier cooling circuit is connected in series with the heat sink fins and then in parallel with the inverter cooling circuit; the inverter cooling circuit is fixed to the inverter power module inside the sealed frequency converter cabinet, and the rectifier cooling circuit is fixed to the rectifier power module inside the sealed frequency converter cabinet. In this embodiment, the refrigerant cooling system also includes a refrigerant cooling circuit; the outlet of the refrigerant cooling circuit is connected to the inlet of the inverter cooling circuit and the rectifier cooling circuit; the inlet of the refrigerant cooling circuit is connected to the outlet of the inverter cooling circuit and the outlet of the heat sink fins.

[0028] The cooling circuit consists of an inverter cooling circuit and a rectifier cooling circuit, and is a key component for heat dissipation in the inverter cabinet. The inlets of the inverter cooling circuit and the rectifier cooling circuit are connected to the outlet of the refrigerant cooling circuit via connecting pipe (9-3). The outlet of the rectifier cooling circuit is connected to the liquid inlet of the heat exchanger fins of the air-water heat exchanger (5) via connecting pipe (9-3). The liquid outlet of the heat exchanger fins and the outlet of the inverter cooling circuit are both connected to the inlet of the cooling circuit via connecting pipe (9-3). In this embodiment, the inverter cooling circuit includes at least an inverter cold plate (4) fixed to the inverter power module, i.e. Figure 2 The inverter cooling plate (4) is connected to the refrigerant cooling circuit outlet (4-1), and the inverter cooling plate outlet (4-2) is connected to the refrigerant cooling circuit outlet. The rectifier cooling circuit includes at least the rectifier cooling plate (3) fixed on the rectifier power module, i.e. Figure 2 The rectifier cold plate (3) is connected to the outlet of the refrigerant cooling circuit at the inlet of the rectifier cold plate (3-2), and the outlet of the rectifier cold plate (3-2) is connected to the inlet of the air-water heat exchanger (5-1), and the outlet of the air-water heat exchanger (5-2) is connected to the inlet of the refrigerant cooling circuit.

[0029] The inverter cooling circuit is specifically designed to cool the inverter power module. Due to its large heat generation, an independent circuit design can meet its high-efficiency heat dissipation requirements. It is fixed on the inverter power module and removes heat through the circulation of refrigerant. The rectifier cooling circuit is used to cool the rectifier power module. It is connected in series with the heat sink fins and then in parallel with the inverter cooling circuit. This design considers the heat dissipation requirements of the rectifier power module and enhances the overall heat dissipation effect through its cooperation with the heat sink fins, while simplifying the piping configuration. The heat sink fins are connected in series with the rectifier cooling circuit. When the refrigerant flows through, it dissipates the heat in the refrigerant through heat exchange with the air. The fan (6) drives the air in the sealed frequency converter cabinet to flow through the heat sink fins, causing the air to absorb heat and rise in temperature, while the refrigerant cools down, thereby achieving heat dissipation of the air and heat-generating devices in the cabinet. The refrigerant cooling circuit plays the role of circulating refrigerant and continuous heat dissipation throughout the heat dissipation process. The outlet of the refrigerant cooling circuit connects to the inlet of both the inverter cooling circuit and the rectifier cooling circuit, providing low-temperature refrigerant to these two circuits to ensure effective heat dissipation from the power module. The inlet of the refrigerant cooling circuit connects to the outlet of the inverter cooling circuit and the outlet of the heat sink fins, recovering the high-temperature refrigerant after heat dissipation and returning it to the refrigerant cooling system for further cooling, thus forming a complete refrigerant circulation and heat dissipation system.

[0030] Specifically, in the refrigerant cooling system, the cooling circuit delivers refrigerant to the inverter cold plate (4) and the rectifier cold plate (3) through connecting pipes (9-3). The refrigerant flows through the channels inside the cold plate. The cold plate can be attached to the power module of the sealed frequency converter cabinet. When the refrigerant flows through the channels inside the cold plate, it absorbs the heat of the power module (such as the inverter power module and the rectifier power module) of the sealed frequency converter cabinet, thereby cooling the power module of the sealed frequency converter cabinet. In this embodiment, the rectifier power module is installed on the rectifier cold plate (3), and the inverter power module is installed on the inverter cold plate (4). In high-power frequency conversion, both the rectifier power module and the inverter power module generate a large amount of heat, and the inverter power module generates more heat. Therefore, in this embodiment, the inverter cold plate (4) uses an independent pipe, while the rectifier cold plate (3) and the heat dissipation fins of the air-water heat exchanger (5) share a common pipe. The refrigerant flows into the rectifier cold plate (3) from the inlet (3-1) and flows within the cold plate according to the designed flow channel, carrying away the heat generated by the rectifier power module. It continues to flow into the air-water heat exchanger (5), where the temperature of the heat dissipation fins is relatively low. The fan (6) drives the high-temperature air inside the inverter cabinet to circulate. The high-temperature air is cooled after passing through the heat dissipation fins of the air-water heat exchanger (5), and the low-temperature air continues to flow within the inverter cabinet. This cycle repeats. Figure 3 As indicated by the arrow inside the cabinet, the heat generated by other heat-generating devices inside the frequency converter cabinet is carried away by the air-water heat exchanger (5), so that the air inside the frequency converter cabinet is kept at a suitable temperature, ensuring the normal use of the devices inside the frequency converter cabinet.

[0031] In this way, the present invention uses refrigerant to dissipate heat and cool down the main working components inside the sealed frequency converter cabinet, such as the inverter power module and the rectifier power module. It can achieve overall heat dissipation inside the sealed frequency converter cabinet, eliminating the need to install fans outside the cabinet and avoiding noise caused by external fans during the heat dissipation process. The volume of the cooling system is also smaller than that of the external fans installed outside the sealed frequency converter cabinet, saving space and facilitating installation.

[0032] Please see Figure 2 In this embodiment, the cooling system further includes a first valve and a second valve. The first valve is located between the inverter cold plate outlet (4-2) and the refrigerant cooling circuit inlet, and is used to regulate the refrigerant flow. The first valve is a parallel combination of an electronic expansion valve (10-1) and a solenoid valve (10-2). The second valve is located between the heat sink fin outlet and the refrigerant cooling circuit inlet, and is used to regulate the refrigerant flow. The second valve is a solenoid valve (10-3).

[0033] In some other embodiments, a temperature sensor can be arranged on the inverter cold plate (4). The opening degree of the electronic expansion valve (10-1) installed on the inverter cold plate outlet pipe (9-1) is adjusted by detecting the temperature of the cold plate by the temperature sensor. The electronic expansion valve (10-1) is characterized by driving the valve needle to stay at any position within the fully open range, which can realize stepless adjustment of the flow rate. By controlling the refrigerant flow rate in the inverter cold plate (4), the temperature of the inverter cold plate (4) can be kept constant. In addition, the control of the electronic expansion valve (10-1) can be achieved by using PID control or staged control, etc. The solenoid valve (10-2) connected in parallel with the electronic expansion valve (10-1) can control the opening or closing of the pipe, which can quickly control the temperature of the inverter cold plate (4). The temperature of the rectifier power module is also crucial, as its heat generation is relatively small compared to that of the inverter power module. In order to simplify the pipeline configuration and control, the rectifier cold plate and the air-water heat exchanger (5) are connected in series on the pipeline. The solenoid valve (10-3) is set on the outlet pipeline (10-3) of the air-water heat exchanger. The opening / closing of the solenoid valve controls the refrigerant flow in the rectifier cold plate (3) and thus controls its temperature, thereby controlling the refrigerant flow in the heat dissipation fins of the air-water heat exchanger (5), and finally controlling the temperature inside the frequency converter cabinet.

[0034] In this embodiment, the refrigerant cooling circuit includes at least an evaporator, a compressor, and a condenser connected in series. The evaporator inlet is connected to the inverter cooling circuit and the outlet (5-2) of the air-water heat exchanger, used to evaporate the refrigerant flowing out of the inverter cooling circuit and the air-water heat exchanger into low-pressure gaseous refrigerant; the compressor compresses the evaporated refrigerant into high-pressure gaseous refrigerant. The condenser outlet is connected to the inlet of the inverter cooling circuit and the rectifier cooling circuit, used to condense the high-pressure gaseous refrigerant into high-pressure subcooled liquid, which flows into the inverter cooling circuit and the rectifier cooling circuit. The refrigerant cooling circuit also includes a throttling component, with its inlet connected to the condenser outlet and its outlet connected to the evaporator inlet, used to control the refrigerant flow rate. Using a refrigerant cooling system to supply refrigerant to the cooling system reduces energy loss and saves on heat dissipation costs.

[0035] Specifically, the throttling component can be set as an electronic expansion valve, which regulates the flow rate of liquid refrigerant delivered from the condenser to the evaporator, ensuring the pressure difference between the condenser and the evaporator to adapt to changes in the evaporator's heat load.

[0036] In this embodiment, the refrigerant cooling circuit further includes a third valve, a fourth valve, and a fifth valve; the third valve is located between the outlet of the inverter cooling circuit and the inlet of the evaporator; the fourth valve is located between the outlet of the heat dissipation fins and the inlet of the evaporator; and the fifth valve is located between the inlet of the inverter cooling circuit and the rectifier cooling circuit and the condenser; wherein, the third valve, the fourth valve, and the fifth valve are all configured as shut-off valves to cut off the refrigerant supply.

[0037] Specifically, several shut-off valves are installed between the refrigerant cooling system and the cooling system, such as... Figure 2 The "Stop Valve 1", "Stop Valve" and "Stop Valve 3" in the text are used to cut off the supply of refrigerant when the sealed frequency converter cabinet no longer needs heat dissipation.

[0038] In some other embodiments, the refrigerant cooling system is located outside the cabinet of the hermetic frequency converter cabinet. Placing the refrigerant cooling system outside the cabinet saves internal space, does not affect the installation of internal working components, and reduces noise generation.

[0039] The heat dissipation device of the sealed frequency converter cabinet provided in this embodiment of the utility model includes a cooling system inside the cabinet and a refrigerant cooling system outside the cabinet. The cooling system is provided with a cooling circuit in which the refrigerant circulates. When the device is running normally, the heat dissipation fins of the air-water heat exchanger are connected to the cooling circuit and can be connected to the low-temperature refrigerant. The fan (6) of the air-water heat exchanger causes the high-temperature air inside the cabinet to flow through the heat dissipation fins, so that the air and the low-temperature refrigerant inside the fins exchange heat and reduce the air temperature. The cooled air circulates inside the cabinet under the drive of the fan (6), ensuring that the heat-generating device is surrounded by the low-temperature airflow, thereby reducing the overall air temperature inside the cabinet. In this way, the external air does not need to participate in the circulation, and the frequency converter cabinet does not need to have ventilation openings, effectively preventing dust and moisture from entering the cabinet. Afterwards, the high-temperature refrigerant heated by the air inside the heat dissipation fins is transferred to the refrigerant cooling system through the cooling circuit. After the refrigerant in the circuit pipe is cooled by the refrigerant cooling system outside the cabinet, the refrigerant flows back into the heat dissipation fins, ensuring that the heat dissipation fins are always filled with low-temperature refrigerant.

[0040] Another aspect of this disclosure provides a sealed frequency converter cabinet, including: a heat dissipation device for the sealed frequency converter cabinet as described above; and a cabinet housing the heat dissipation device.

[0041] Figure 4 This is a schematic diagram of the structure of a sealed frequency converter cabinet provided in one embodiment of the present disclosure. Figure 5 This is a schematic diagram of the structure of a sealed frequency converter cabinet provided in one embodiment of the present disclosure.

[0042] Combined with reference Figure 4 and Figure 5 The sealed frequency converter cabinet includes a cabinet body (2) and a cabinet door (1). An inlet and an outlet can be opened on the cabinet body. Specifically, a rectifier cold plate inlet (3-1) is opened on the cabinet body, thereby connecting the rectifier cold plate (3) to the refrigerant cooling system, and delivering the refrigerant to the heat dissipation fins of the rectifier cold plate (3) and the air-water heat exchanger (5) for heat dissipation and cooling. An inverter cold plate inlet (4-1) and an inverter cold plate outlet (4-2) are opened on the cabinet body, thereby connecting the inverter cold plate (4) to the refrigerant cooling system, and delivering the refrigerant to the inverter cold plate (4) for heat dissipation and cooling.

[0043] An inlet and outlet are provided on the cabinet of the sealed frequency converter cabinet to connect the refrigerant cooling system with the cooling system, eliminating the need for additional ventilation openings. This ensures the protection of the sealed frequency converter cabinet while achieving effective heat dissipation.

[0044] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A heat dissipation device for a sealed frequency converter cabinet, characterized in that, include: Refrigerant cooling system; The cooling system includes at least a cooling circuit and a water-cooled heat exchanger disposed within the sealed frequency converter cabinet; the water-cooled heat exchanger includes heat dissipation fins and a fan disposed on one side of the heat dissipation fins. The inlet of the cooling circuit is connected to the outlet of the refrigerant cooling system, and the outlet of the cooling circuit is simultaneously connected to the inlet of the heat dissipation fins and the inlet of the refrigerant cooling system; the outlet of the heat dissipation fins is connected to the inlet of the refrigerant cooling system. The fan is used to drive the air inside the sealed frequency converter cabinet to flow through the heat dissipation fins and the air-cooled heat dissipation devices inside the sealed frequency converter cabinet, and to circulate the air inside the sealed frequency converter cabinet.

2. The heat dissipation device for the sealed frequency converter cabinet according to claim 1, characterized in that, The cooling circuit includes an inverter cooling circuit and a rectifier cooling circuit; wherein... The rectifier cooling circuit is connected in series with the heat dissipation fins and then connected in parallel with the inverter cooling circuit; The inverter cooling circuit is fixed to the inverter power module inside the sealed frequency converter cabinet, and the rectifier cooling circuit is fixed to the rectifier power module inside the sealed frequency converter cabinet.

3. The heat dissipation device for the sealed frequency converter cabinet according to claim 2, characterized in that, The refrigerant cooling system also includes a refrigerant cooling circuit; The outlet of the refrigerant cooling circuit is connected to the inlet of the inverter cooling circuit and the rectifier cooling circuit. The inlet of the refrigerant cooling circuit is connected to the outlet of the inverter cooling circuit and the outlet of the heat dissipation fins.

4. The heat dissipation device for the sealed frequency converter cabinet according to claim 3, characterized in that, The inverter cooling circuit includes at least an inverter cooling plate fixed to the inverter power module; The inlet of the inverter cold plate is connected to the outlet of the refrigerant cooling circuit, and the outlet of the inverter cold plate is connected to the inlet of the refrigerant cooling circuit.

5. The heat dissipation device for the sealed frequency converter cabinet according to claim 4, characterized in that, The cooling system also includes a first valve, which is located between the outlet of the inverter cold plate and the inlet of the refrigerant cooling circuit, and is used to regulate the refrigerant flow rate. The first valve consists of an electronic expansion valve and a solenoid valve connected in parallel.

6. The heat dissipation device for the sealed frequency converter cabinet according to claim 3, characterized in that, The rectifier cooling circuit includes at least a rectifier cooling plate fixed on the rectifier power module; The inlet of the rectifier cold plate is connected to the outlet of the refrigerant cooling circuit, the outlet of the rectifier cold plate is connected to the inlet of the air-water heat exchanger, and the outlet of the air-water heat exchanger is connected to the inlet of the refrigerant cooling circuit.

7. The heat dissipation device for the sealed frequency converter cabinet according to claim 6, characterized in that, The cooling system further includes a second valve, which is disposed between the outlet of the heat dissipation fins and the inlet of the refrigerant cooling circuit; the second valve is used to regulate the refrigerant flow rate. The second valve is a solenoid valve.

8. The heat dissipation device for the sealed frequency converter cabinet according to claim 3, characterized in that, The refrigerant cooling circuit includes at least an evaporator, a compressor, a condenser, and a throttling assembly connected in series; wherein, The inlet of the evaporator is connected to the outlet of the inverter cooling circuit and the air-water heat exchanger, and is used to evaporate the refrigerant flowing out of the inverter cooling circuit and the air-water heat exchanger into low-pressure gaseous refrigerant. The compressor compresses the evaporated refrigerant into a high-pressure gaseous refrigerant. The outlet of the condenser is connected to the inlet of the inverter cooling circuit and the rectifier cooling circuit, and is used to condense the high-pressure gaseous refrigerant into a high-pressure subcooled liquid, which flows into the inverter cooling circuit and the rectifier cooling circuit. The inlet of the throttling component is connected to the outlet of the condenser, and the outlet of the throttling component is connected to the inlet of the evaporator. The throttling component is used to control the flow rate of the refrigerant.

9. The heat dissipation device for the sealed frequency converter cabinet according to claim 8, characterized in that, The refrigerant cooling circuit also includes a third valve, a fourth valve, and a fifth valve; The third valve is located between the outlet of the inverter cooling circuit and the inlet of the evaporator; The fourth valve is located between the outlet of the heat dissipation fins and the inlet of the evaporator; The fifth valve is located between the inlet of the inverter cooling circuit and the rectifier cooling circuit and the condenser; The third valve, the fourth valve, and the fifth valve are all configured as shut-off valves to cut off the supply of the refrigerant.

10. A sealed frequency converter cabinet, characterized in that, include: The heat dissipation device for the enclosed frequency converter cabinet as described in any one of claims 1 to 9; and the cabinet housing the heat dissipation device.

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