Cabinet type frequency converter

Abstract

The application relates to the field of frequency converters, in particular to a cabinet-type frequency converter which comprises a cabinet body and a heat dissipation device, the cabinet body is provided with an installation cavity for mounting power devices, the heat dissipation device comprises a heat dissipation fan, a filter screen one, a filter screen two and an opening and closing assembly, an air inlet cavity is formed in one side of the cabinet body, an air outlet cavity is formed in the other side of the cabinet body, the filter screen one is connected to the inner wall of the air inlet cavity, the filter screen two is connected to the inner wall of the air outlet cavity, the heat dissipation fan is rotationally connected to the inner wall of the air inlet cavity, and the opening and closing assembly is connected to the cabinet body. In the application, the heat dissipation fan, the filter screen one, the filter screen two and the opening and closing assembly are arranged to promote the air flow in the installation cavity, improve the cooling efficiency of the frequency converter, make the plastic connectors in the cabinet not easily age and become brittle under the high-temperature state for a long time, reduce the fault risk of the cabinet-type frequency converter, and prolong the service life of the cabinet-type frequency converter.

Description

Technical Field

[0001] This application relates to the field of frequency converters, and more particularly to a cabinet-type frequency converter. Background Technology

[0002] A cabinet-type frequency converter is a complete set of equipment that integrates the core module of the frequency converter (power devices and control circuits for AC-DC-AC conversion) and its supporting protection devices (such as circuit breakers and reactors) into a metal electrical control cabinet.

[0003] During the use of cabinet-type frequency converters, the power devices generate significant energy loss during switching, converting electrical energy into heat energy. This causes the temperature inside the cabinet to rise sharply, making the plastic connectors inside the cabinet prone to aging and becoming brittle under high temperature conditions. This increases the risk of failure of the cabinet-type frequency converter and thus shortens its service life. Summary of the Invention

[0004] In order to improve the service life of cabinet-type frequency converters, this application provides a cabinet-type frequency converter.

[0005] This application provides a cabinet-type frequency converter, which adopts the following technical solution: A cabinet-type frequency converter includes a cabinet and a heat dissipation device. The cabinet has a mounting cavity for mounting power devices. The heat dissipation device includes a cooling fan, a first filter, a second filter, and an opening / closing assembly. An air inlet cavity is opened on one side of the cabinet, and an air outlet cavity is opened on the other side of the cabinet. The mounting cavity connects the air inlet cavity and the air outlet cavity. The first filter is connected to the inner wall of the air inlet cavity, and the second filter is connected to the inner wall of the air outlet cavity. The cooling fan is rotatably connected to the inner wall of the air inlet cavity. The cooling fan rotates and drives outside air to enter the mounting cavity through the first filter and then exit through the air outlet cavity after being filtered by the second filter. The opening / closing assembly is connected to the cabinet and can control the opening and closing of the air inlet cavity and the air outlet cavity.

[0006] By adopting the above technical solution, the opening and closing component closes the air inlet and outlet chambers, making it difficult for external impurities to adhere to the surfaces of filter screen one and filter screen two, thus ensuring the cleanliness of the filter screen one and filter screen two surfaces. When the cabinet temperature rises, the opening and closing component opens the air inlet and outlet chambers, the cooling fan rotates and drives the outside air to enter the mounting chamber after being filtered by filter screen one. The power devices in the mounting chamber come into full contact with the air and exchange heat, thereby cooling the cabinet. At the same time, the high-temperature air in the mounting chamber rises, is filtered by filter screen two, and is discharged, thereby promoting airflow in the mounting chamber, further improving the cooling efficiency of the frequency converter, making the plastic connectors in the cabinet less prone to aging and becoming brittle under high temperature conditions for a long time, reducing the failure risk of the cabinet frequency converter, and thus extending the service life of the cabinet frequency converter.

[0007] Optionally, the opening and closing assembly further includes a shape memory alloy, a sliding plate, and a rotating plate. The cabinet surface has an opening and closing cavity for the shape memory alloy to be embedded. The end face of the shape memory alloy flush with the cabinet surface is connected to the sliding plate surface. The sliding plate surface abuts against the cabinet surface and closes the air inlet cavity. The rotating plate is rotatably connected to the inner wall of the air outlet cavity. When the rotating plate rotates towards the direction of the second filter, the outer peripheral surface of the rotating plate abuts against the inner wall of the air outlet cavity and closes the air outlet cavity.

[0008] By adopting the above technical solution, when the power device in the installation cavity is running, the heat generated is transferred to the shape memory alloy through the cabinet. The shape memory alloy heats up and expands, pushing the sliding plate away from the cabinet. The pressing effect between the sliding plate and the cabinet surface disappears, the air inlet cavity opens, and at the same time, the rotating plate is driven to rotate away from the filter screen. The sealing effect of the rotating plate on the air outlet cavity disappears, the air outlet cavity opens, and the directional opening of the air outlet cavity and the air inlet cavity is realized.

[0009] Optionally, the opening and closing assembly further includes a connecting rope and an elastic element. A connecting flow channel is provided on the inner wall of the air outlet cavity. The connecting flow channel passes through the surface of the cabinet in the direction close to the sliding plate. One end of the connecting rope is wound around the rotating shaft of the rotating plate, and the other end of the connecting rope passes through the connecting flow channel and is connected to the surface of the sliding plate. One end of the elastic element is connected to the rotating shaft of the rotating plate in the direction of elasticity, and the other end of the elastic element is connected to the inner wall of the air outlet cavity. The elastic element has the elasticity to drive the rotating plate to rotate in the direction close to the filter screen. The connecting rope is wound around the outer circumference of the rotating shaft of the rotating plate, and the connecting rope tends to be in a taut state. When the sliding plate moves away from the cabinet, the connecting rope drives the rotating plate to rotate away from the air outlet cavity.

[0010] By adopting the above technical solution, when the shape memory alloy heats up and expands, it pushes the sliding plate away from the cabinet. The connecting rope receives the power of the sliding plate and drives the rotating plate to rotate away from the second filter, thus realizing the directional opening of the air outlet and air inlet chambers. When the shape memory alloy cools down and contracts, it drives the sliding plate closer to the cabinet. The sliding plate surface presses against the cabinet surface and closes the air inlet chamber. The tension of the connecting rope on the rotating plate disappears, and the elastic force of the elastic element drives the rotating plate to rotate closer to the second filter. The outer circumference of the rotating plate presses against the inner wall of the air outlet chamber and closes the air outlet chamber, thus realizing the directional closing of the air outlet and air inlet chambers. No manual control by the operator is required, thereby improving the ease of use of the cabinet-type frequency converter.

[0011] Optionally, the opening and closing assembly further includes an actuating rod and a contact switch. The end of the actuating rod is connected to the surface of the cabinet near the sliding plate, and the contact switch is connected to the surface of the actuating rod facing the sliding plate. The contact switch is electrically connected to the cooling fan. When the sliding plate moves away from the cabinet, the contact switch abuts against the surface of the sliding plate and conducts electricity, energizing and running the cooling fan.

[0012] By adopting the above technical solution, when the shape memory alloy heats up and expands, pushing the sliding plate away from the cabinet, the contact switch abuts against the sliding plate and conducts electricity, so that the cooling fan is powered on and runs. This eliminates the need for the cooling fan to keep running, reducing energy consumption and thus embodying the concept of energy saving.

[0013] Optionally, the heat dissipation device further includes multiple heat sinks, and a heat dissipation cavity is provided on the side wall of the cabinet. The multiple heat sinks are connected at intervals to the inner wall of the heat dissipation cavity, and the arrangement direction of the heat sinks is parallel to the width direction of the cabinet.

[0014] By adopting the above technical solution, multiple heat sinks are connected at intervals to the inner wall of the heat dissipation cavity. The arrangement direction of the heat sinks is parallel to the width direction of the cabinet. The cabinet transfers heat energy to the heat sinks, and the heat sinks fully contact the air and exchange heat, increasing the contact area between the cabinet and the air, thereby further improving the heat dissipation efficiency of the cabinet-type frequency converter.

[0015] Optionally, the heat sink is rotatably connected to the inner wall of the heat dissipation cavity, and the rotation axis of the heat sink is parallel to the height direction of the cabinet.

[0016] By adopting the above technical solution, the heat sink oscillates on the inner wall of the heat dissipation cavity, which promotes the airflow in the heat dissipation cavity, so that the heat sink can fully contact the air and exchange heat, thereby further improving the heat dissipation efficiency of the cabinet-type frequency converter.

[0017] Optionally, the cabinet is connected to a transmission assembly, which includes a rack and multiple gears. Each gear corresponds to a heat sink and is coaxially connected to the heat sink's rotating shaft. The inner wall of the heat dissipation cavity is provided with a slide for the rack to slide. The sliding direction of the rack is parallel to the width direction of the cabinet, and the rack meshes with multiple gears.

[0018] By adopting the above technical solution, the gears correspond one-to-one with the heat sink and are coaxially fixed on the rotating shaft of the heat sink. The rack meshes with multiple gears, and by pushing the rack to slide back and forth on the inner wall of the slide, the heat sink is driven to swing on the inner wall of the heat dissipation cavity. There is no need to install an external power device for each heat sink, thereby reducing the production cost of the cabinet-type frequency converter.

[0019] Optionally, the transmission assembly further includes a cam and an elastic element two. The cam is rotatably connected to the inner wall of the heat dissipation cavity, and the rotation axis of the cam is parallel to the height direction of the cabinet. One end of the elastic element two in the elastic direction is connected to the inner wall of the slide, and the other end of the elastic element two in the elastic direction is connected to the surface of the rack. The elastic element two has the elastic force to drive the rack to slide towards the cam, and the surface of the rack tends to press against the cam wheel surface.

[0020] By adopting the above technical solution, the elastic element drives the rack to slide towards the cam, the rack surface abuts against the cam wheel surface, the cam has a large end and a small end, the cam drives the rack to slide back and forth on the inner wall of the groove, causing the heat sink to swing on the inner wall of the heat dissipation cavity, thereby promoting the air flow in the heat dissipation cavity.

[0021] Optionally, the rack includes teeth and a wheel body, the teeth being slidably connected to the inner wall of the slide, the wheel body being rotatably connected to the surface of the teeth facing the cam, and the wheel body surface rollingly contacting the cam wheel surface.

[0022] By adopting the above technical solution, the elastic element drives the teeth to approach the cam, and the wheel surface of the wheel body makes rolling contact with the cam wheel surface. Rolling friction replaces sliding friction, reducing the wear between the cam and the rack, thereby extending the service life of the cabinet-type frequency converter.

[0023] Optionally, the transmission assembly further includes at least two synchronous pulleys and a synchronous belt used in conjunction with the synchronous pulleys. The rotation axis of the cam and the rotation axis of the cooling fan are parallel to each other. A transmission cavity is provided in the inner wall of the air inlet cavity. The transmission cavity connects the cooling cavity and the air inlet cavity. One of the synchronous pulleys is coaxially connected to the rotation axis of the cooling fan, and the other synchronous pulley is coaxially connected to the rotation axis of the cam. The synchronous belt is tensioned and connected to the two synchronous pulleys through the transmission cavity.

[0024] By adopting the above technical solution, the synchronous belt is tensioned and connected to the two synchronous pulleys through the transmission cavity. The cooling fan drives the cam to rotate through the synchronous belt and the synchronous pulleys. There is no need for an external power device to drive the cam to rotate, thereby reducing energy consumption and embodying the concept of energy saving.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The cooling fan, filter screen one, filter screen two, and opening / closing components promote airflow within the installation cavity, improving the cooling efficiency of the inverter. This prevents the plastic connectors inside the cabinet from aging and becoming brittle due to prolonged exposure to high temperatures, reducing the risk of failure for the cabinet-type inverter and thus extending its service life. The use of shape memory alloy, sliding plate, and rotating plate eliminates the sealing effect of the rotating plate on the air outlet cavity, opening the air outlet cavity and achieving directional opening of the air outlet cavity and air inlet cavity; The connection rope and elastic element enable directional closure of the air outlet and air inlet chambers, eliminating the need for manual control and thus improving the ease of use of the cabinet-type frequency converter. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in the embodiments of this application.

[0027] Figure 2This is a cross-sectional view of an embodiment of this application.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 This is a partial structural diagram of an embodiment of this application, mainly showing the transmission component.

[0030] Explanation of reference numerals in the attached drawings: 1. Cabinet; 11. Mounting cavity; 12. Air inlet cavity; 13. Air outlet cavity; 14. Opening and closing cavity; 15. Connecting flow channel; 16. Heat dissipation cavity; 17. Slide rail; 18. Transmission cavity; 2. Heat dissipation device; 21. Cooling fan; 22. Filter screen one; 23. Filter screen two; 24. Opening and closing assembly; 241. Shape memory alloy; 242. Sliding plate; 243. Rotating plate; 244. Connecting rope; 245. Elastic element one; 246. Starting rod; 247. Contact switch; 25. Heat sink; 3. Cabinet door; 4. Transmission assembly; 41. Rack; 411. Tooth; 412. Wheel body; 42. Cam; 43. Elastic element two; 44. Synchronous pulley; 45. Synchronous belt; 46. Gear. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a cabinet-type frequency converter. (Refer to...) Figure 1 and Figure 2 The cabinet-type frequency converter includes a cabinet 1 and a heat dissipation device 2. The bottom of the cabinet 1 abuts against the ground to form a support. The cabinet 1 has a mounting cavity 11 for installing power devices. A cabinet door 3 is rotatably connected to the surface of the cabinet 1. The rotation axis of the cabinet door 3 is parallel to the height direction of the cabinet 1. The cabinet door 3 can close the mounting cavity 11. The heat dissipation device 2 is installed on the cabinet 1. The heat dissipation device 2 can promote the airflow in the mounting cavity 11. The air in the mounting cavity 11 fully contacts the power devices and exchanges heat, thereby improving the heat dissipation efficiency of the cabinet-type frequency converter. This prevents the plastic connectors inside the cabinet from aging and becoming brittle under high temperature conditions for a long time, reduces the failure risk of the cabinet-type frequency converter, and thus extends the service life of the cabinet-type frequency converter.

[0033] Reference Figure 1 and Figure 2The heat dissipation device 2 includes a cooling fan 21, a first filter 22, a second filter 23, an opening and closing assembly 24, and multiple heat sinks 25. An air inlet cavity 12 is provided on one side of the cabinet 1 along its height, and an air outlet cavity 13 is provided on the other side. The mounting cavity 11 connects the air inlet cavity 12 and the air outlet cavity 13. The number of first filters 22 can be one, two, or more. In this embodiment, there are two first filters 22. The two first filters 22 are fixed to the inner wall of the air inlet cavity 12 with bolts at intervals. The first filters 22 can filter impurities in the air. The second filter 23 is fixed to the air outlet cavity 13 with bolts. The inner wall of the air cavity 13 has a filter screen 23 that can filter impurities in the air. The cooling fan 21 is rotatably connected to the inner wall of the air inlet cavity 12. The cooling fan 21 is located between two filters 22. The rotation axis of the cooling fan 21 is parallel to the height direction of the cabinet 1. The air outlet of the cooling fan 21 faces the mounting cavity 11. The cooling fan 21 rotates on the inner wall of the air inlet cavity 12 and drives the outside air to enter the mounting cavity 11 through the filter screen 22 and then through the air outlet cavity 13 and after being filtered by the filter screen 23, it is discharged. The power devices in the mounting cavity 11 are in full contact with the air and exchange heat, thereby cooling the cabinet 1.

[0034] Reference Figure 2 and Figure 3 The opening and closing assembly 24 is installed on the cabinet 1. The opening and closing assembly 24 can control the opening and closing of the air inlet cavity 12 and the air outlet cavity 13. The opening and closing assembly 24 includes a shape memory alloy 241, a sliding plate 242, a rotating plate 243, a connecting rope 244, an elastic element 245, a starting rod 246, and a contact switch 247. The surface of the cabinet 1 near the air inlet cavity 12 has an opening and closing cavity 14 for the shape memory alloy 241 to be embedded. The end face of the shape memory alloy 241 flush with the surface of the cabinet 1 is fixed to the surface of the sliding plate 242. The surface of the sliding plate 242 abuts against the bottom surface of the cabinet 1 and closes the air inlet cavity 12. The end of the starting rod 246 is fixed to the surface of the cabinet 1 near the sliding plate 242. The contact switch 247 is fixed to the surface of the starting rod 246 facing the sliding plate 242. The contact switch 247 is electrically connected to the cooling fan 21.

[0035] Reference Figure 2 and Figure 3 When the shape memory alloy 241 heats up and expands, it pushes the sliding plate 242 away from the cabinet 1. The sealing effect of the sliding plate 242 on the air inlet cavity 12 disappears. At the same time, the contact switch 247 abuts against the sliding plate 242 and conducts, so that the cooling fan 21 is energized and runs, realizing the directional start of the cooling fan 21, reducing energy consumption, and thus embodying the concept of energy saving.

[0036] Reference Figure 2 and Figure 3The rotating plate 243 is rotatably connected to the inner wall of the air outlet cavity 13. The rotation axis of the rotating plate 243 is parallel to the width direction of the cabinet 1. The rotating plate 243 is located on the side of the filter screen 23 away from the mounting cavity 11. A connecting flow channel 15 is opened on the inner wall of the air outlet cavity 13 facing the rotation axis of the rotating plate 243. The connecting flow channel 15 passes through the surface of the cabinet 1 in the direction close to the sliding plate 242. One end of the connecting rope 244 is wrapped around the outer circumference of the rotation axis of the rotating plate 243, and the other end of the connecting rope 244 passes through the connecting flow channel 15 and is fixed to the surface of the sliding plate 242. The elastic element 245 can be a torsion spring or a coil spring. In this embodiment, the elastic element 245 is a coil spring with a certain deformation capacity. One end of the elastic element 245 in the direction of elastic force is connected to the rotation axis of the rotating plate 243, and the other end of the elastic element 245 in the direction of elastic force is connected to the air outlet cavity 13. The inner wall of the air cavity 13 has an elastic element 245 that drives the rotating plate 243 to rotate towards the filter screen 23. The outer circumference of the rotating plate 243 presses against the inner wall of the air outlet cavity 13 and seals the air outlet cavity 13. The connecting rope 244 is wrapped around the outer circumference of the rotating shaft of the rotating plate 243 and tends to be in a taut state. When the shape memory alloy 241 pushes the sliding plate 242 away from the cabinet 1, the sliding plate 242 pulls the rotating plate 243 away from the filter screen 23 through the connecting rope 244. The sealing effect of the rotating plate 243 on the air outlet cavity 13 disappears, realizing the directional start of the air outlet cavity 13 and the air inlet cavity 12. This makes it difficult for external impurities to adhere to the surface of the filter screen 22 and the filter screen 23 through the air inlet cavity 12 and the air outlet cavity 13, thereby ensuring the cleanliness of the surface of the filter screen 22 and the filter screen 23.

[0037] Reference Figure 2 and Figure 3 A heat dissipation cavity 16 is provided on one side of the cabinet 1 in the width direction. Multiple heat sinks 25 are rotatably connected to the inner wall of the heat dissipation cavity 16 at intervals. The arrangement direction of the heat sinks 25 is parallel to the width direction of the cabinet 1, and the rotation axis of the heat dissipation cavity 16 is parallel to the height direction of the cabinet 1. The heat sinks 25 swing on the inner wall of the heat dissipation cavity 16, which drives the air flow in the heat dissipation cavity 16, so that the cabinet 1 can stably transfer heat energy to the air in the heat dissipation cavity 16 through the heat sinks 25, further improving the heat dissipation efficiency of the cabinet inverter.

[0038] Reference Figure 2 and Figure 4The cabinet 1 is equipped with a transmission assembly 4, which can receive the power of the cooling fan 21 and drive multiple heat sinks 25 to swing. The transmission assembly 4 includes a rack 41, a cam 42, an elastic element 43, two synchronous pulleys 44, a synchronous belt 45 used in conjunction with the synchronous pulleys 44, and multiple gears 46. The gears 46 correspond one-to-one with the heat sinks 25 and are coaxially fixed on the rotating shaft of the heat sinks 25. The rack 41 includes a tooth 411 and a wheel body 412. The wheel body 412 is rotatably connected to one end of the tooth 411 in the length direction, and the rotation axis of the wheel body 412 is perpendicular to the length direction of the tooth 411. The heat dissipation cavity 16 has a slide 17 on the inner wall facing the gear 46 for the tooth 411 to slide. The sliding direction of the tooth 411 is parallel to the width direction of the cabinet 1. The tooth surface of the tooth 411 meshes with multiple gears 46, and the axis of the wheel body 412 is parallel to the rotation axis of the cooling fan 21.

[0039] Reference Figure 2 and Figure 4 The cam 42 is rotatably connected to the inner wall of the heat dissipation cavity 16 near the wheel body 412. The rotation axis of the cam 42 and the rotation axis of the cooling fan 21 are parallel to each other. The elastic element 43 can be a compression spring or a tension spring. In this embodiment, the elastic element 43 is a compression spring with a certain deformation energy. One end of the elastic element 43 in the direction of elastic force is connected to the inner wall of the slide 17 away from the cam 42, and the other end of the elastic element 43 in the direction of elastic force is connected to the surface of the tooth 411 away from the wheel body 412. The elastic element 43 has the elastic force to drive the tooth 411 closer to the cam 42, and the wheel surface of the wheel body 412 and the wheel surface of the cam 42 tend to roll into contact. Rolling friction replaces sliding friction, reducing the wear between the cam 42 and the rack 41, thereby extending the service life of the cabinet-type frequency converter.

[0040] Reference Figure 2 and Figure 4 The air inlet cavity 12 has a transmission cavity 18 on its inner wall near the rotating shaft of the cooling fan 21. The transmission cavity 18 connects the cooling cavity 16 and the air inlet cavity 12. One synchronous pulley 44 is coaxially fixed on the rotating shaft of the cooling fan 21, and the other synchronous pulley 44 is coaxially fixed on the rotating shaft of the cam 42. The synchronous belt 45 is tensioned and connected to the two synchronous pulleys 44 through the transmission cavity 18. The cooling fan 21 drives the cam 42 to rotate through the synchronous belt 45 and the synchronous pulleys 44. No external power device is needed to drive the cam 42 to rotate, reducing energy consumption and thus embodying the concept of energy saving.

[0041] The implementation principle of a cabinet-type frequency converter in this application embodiment is as follows: When the power device in the mounting cavity 11 operates, the heat energy generated is transferred to the shape memory alloy 241 through the cabinet 1. The shape memory alloy 241 heats up and expands, pushing the sliding plate 242 away from the cabinet 1. The contact effect between the sliding plate 242 and the surface of the cabinet 1 disappears, the air inlet cavity 12 opens, and the sliding plate 242 pulls the rotating plate 243 in a direction away from the filter screen 23 through the connecting rope 244, realizing the directional opening of the air outlet cavity 13 and the air inlet cavity 12, and the hot air fan rotates. It also draws outside air through filter screen 22 into the mounting cavity 11. The power devices in the mounting cavity 11 come into full contact with the air and exchange heat, thereby cooling the cabinet 1. At the same time, the high-temperature air in the mounting cavity 11 rises and is discharged after being filtered by filter screen 23, thus promoting airflow in the mounting cavity 11, further improving the cooling efficiency of the inverter, making the plastic connectors in the cabinet less prone to aging and becoming brittle under high temperature conditions for a long time, reducing the failure risk of the cabinet inverter, and thus extending the service life of the cabinet inverter.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cabinet-type frequency converter, characterized in that: The device includes a cabinet (1) and a heat dissipation device (2). The cabinet (1) has a mounting cavity (11) for installing power devices. The heat dissipation device (2) includes a cooling fan (21), a first filter (22), a second filter (23), and an opening / closing assembly (24). An air inlet cavity (12) is provided on one side of the cabinet (1), and an air outlet cavity (13) is provided on the other side of the cabinet (1). The mounting cavity (11) connects the air inlet cavity (12) and the air outlet cavity (13). The first filter (22) is connected to the air inlet cavity (13). 12) The inner wall of the air outlet cavity (13) is connected to the inner wall of the air outlet cavity (13). The cooling fan (21) is rotatably connected to the inner wall of the air inlet cavity (12). The cooling fan (21) rotates and drives the outside air to enter the installation cavity (11) through the first filter screen (22) and then through the air outlet cavity (13) after being filtered by the second filter screen (23). The opening and closing component (24) is connected to the cabinet (1). The opening and closing component (24) can control the opening and closing of the air inlet cavity (12) and the air outlet cavity (13).

2. The cabinet-type frequency converter according to claim 1, characterized in that: The opening and closing assembly (24) further includes a shape memory alloy (241), a sliding plate (242), and a rotating plate (243). The cabinet (1) has an opening and closing cavity (14) for the shape memory alloy (241) to be embedded in. The end face of the shape memory alloy (241) flush with the surface of the cabinet (1) is connected to the surface of the sliding plate (242). The surface of the sliding plate (242) abuts against the surface of the cabinet (1) and closes the air inlet cavity (12). The rotating plate (243) is rotatably connected to the inner wall of the air outlet cavity (13). When the rotating plate (243) rotates toward the direction of the second filter (23), the outer peripheral surface of the rotating plate (243) abuts against the inner wall of the air outlet cavity (13) and closes the air outlet cavity (13).

3. The cabinet-type frequency converter according to claim 2, characterized in that: The opening and closing assembly (24) also includes a connecting rope (244) and an elastic element (245). The inner wall of the air outlet cavity (13) is provided with a connecting flow channel (15). The connecting flow channel (15) passes through the surface of the cabinet (1) in the direction close to the sliding plate (242). One end of the connecting rope (244) is wound around the rotating shaft of the rotating plate (243), and the other end of the connecting rope (244) passes through the connecting flow channel (15) and is connected to the surface of the sliding plate (242). One end of the elastic element (245) in the elastic direction is connected to the rotating plate (243). On the rotating shaft, the other end of the elastic element one (245) in the elastic direction is connected to the inner wall of the air outlet cavity (13). The elastic element one (245) has the elasticity to drive the rotating plate (243) to rotate in the direction closer to the filter screen two (23). The connecting rope (244) is wrapped around the outer circumference of the rotating shaft of the rotating plate (243), and the connecting rope (244) tends to be in a taut state. When the sliding plate (242) moves away from the cabinet (1), the connecting rope (244) drives the rotating plate (243) to rotate in the direction away from the air outlet cavity (13).

4. The cabinet-type frequency converter according to claim 2, characterized in that: The opening and closing assembly (24) also includes an actuating rod (246) and a contact switch (247). The end of the actuating rod (246) is connected to the surface of the cabinet (1) near the sliding plate (242). The contact switch (247) is connected to the surface of the actuating rod (246) facing the sliding plate (242). The contact switch (247) is electrically connected to the cooling fan (21). When the sliding plate (242) moves away from the cabinet (1), the contact switch (247) abuts against the surface of the sliding plate (242) and conducts electricity, and the cooling fan (21) is energized and runs.

5. The cabinet-type frequency converter according to claim 1, characterized in that: The heat dissipation device (2) also includes a plurality of heat sinks (25), and the side wall of the cabinet (1) is provided with a heat dissipation cavity (16). The plurality of heat sinks (25) are spaced apart and connected to the inner wall of the heat dissipation cavity (16), and the arrangement direction of the heat sinks (25) is parallel to the width direction of the cabinet (1).

6. The cabinet-type frequency converter according to claim 5, characterized in that: The heat sink (25) is rotatably connected to the inner wall of the heat dissipation cavity (16), and the rotation axis of the heat sink (25) is parallel to the height direction of the cabinet (1).

7. The cabinet-type frequency converter according to claim 6, characterized in that: The cabinet (1) is connected to a transmission assembly (4), which includes a rack (41) and multiple gears (46). The gears (46) correspond one-to-one with the heat sink (25) and are coaxially connected to the rotating shaft of the heat sink (25). The inner wall of the heat dissipation cavity (16) is provided with a slide (17) for the rack (41) to slide. The sliding direction of the rack (41) is parallel to the width direction of the cabinet (1), and the rack (41) meshes with multiple gears (46).

8. The cabinet-type frequency converter according to claim 7, characterized in that: The transmission assembly (4) also includes a cam (42) and an elastic element (43). The cam (42) is rotatably connected to the inner wall of the heat dissipation cavity (16). The rotation axis of the cam (42) is parallel to the height direction of the cabinet (1). One end of the elastic element (43) in the elastic direction is connected to the inner wall of the slide (17), and the other end of the elastic element (43) in the elastic direction is connected to the surface of the rack (41). The elastic element (43) has the elastic force to drive the rack (41) to slide towards the cam (42), and the surface of the rack (41) tends to press against the wheel surface of the cam (42).

9. The cabinet-type frequency converter according to claim 8, characterized in that: The rack (41) includes a tooth (411) and a wheel (412). The tooth (411) is slidably connected to the inner wall of the slide (17), and the wheel (412) is rotatably connected to the surface of the tooth (411) facing the cam (42). The wheel surface of the wheel (412) is in rolling contact with the wheel surface of the cam (42).

10. The cabinet-type frequency converter according to claim 8, characterized in that: The transmission assembly (4) further includes at least two synchronous pulleys (44) and a synchronous belt (45) used in conjunction with the synchronous pulleys (44). The rotation axis of the cam (42) and the rotation axis of the cooling fan (21) are parallel to each other. The inner wall of the air inlet cavity (12) is provided with a transmission cavity (18). The transmission cavity (18) connects the cooling cavity (16) and the air inlet cavity (12). One of the synchronous pulleys (44) is coaxially connected to the rotation axis of the cooling fan (21), and the other synchronous pulley (44) is coaxially connected to the rotation axis of the cam (42). The synchronous belt (45) is tensioned and connected to the two synchronous pulleys (44) through the transmission cavity (18).

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