A heat dissipation structure of frequency converter

Abstract

The present invention relates to a heat dissipation structure of a frequency converter in the field of frequency converters, including a frequency converter housing, a power unit is arranged in the frequency converter housing, and a heat sink group is installed at one end. The heat sink group is composed of a heat exchange substrate, one end of which is connected to a plurality of heat exchange fins, and the other end is connected to a heat exchange baffle. Both ends of the frequency converter are equipped with air cooling structures, including a mounting frame and a sealing frame on which an axial flow fan is installed, and a cover plate covering the heat sink group. Both ends of the heat sink group are provided with a heat exchange switching structure, including a fixed frame and a movable door, the movable door covers the space between the fins, and the fixed frame has a through hole matching the movable door; the opening and closing states of the auxiliary baffle and the movable door, as well as the rotation speed of the axial flow fan are controlled by the working state of the frequency converter and the ambient temperature, so as to realize cooling of the frequency converter housing in accordance with environmental and working changes; not only the heat dissipation efficiency of the frequency converter is improved, its service life is extended, but also the stable operation of the equipment under different working environments is ensured.

Description

Technical Field

[0001] The present invention relates to a frequency converter heat sink group, and in particular to a heat dissipation structure of a frequency converter applied in the field of frequency converters. Background Art

[0002] As an indispensable device in industrial automation, the development of heat dissipation technology of inverters directly affects the stability and life of the equipment. In the early days, inverter heat dissipation mainly relied on natural convection and simple heat sinks. With the increase of power density, the heat dissipation requirements have become increasingly stringent, and heat dissipation technology has also been continuously improved.

[0003] As the power density of inverters continues to increase, heat dissipation technology is also constantly improving. At present, forced air cooling and liquid cooling are more common solutions, while heat pipes and direct cooling technologies are used in specific fields and high-end applications.

[0004] In order to solve the problem of heat dissipation efficiency of existing inverters, a certain inverter in the market adopts a design of installing multiple fans, which has a certain market share.

[0005] The specification of Chinese invention patent CN112910222B discloses a heat sink group and a frequency converter, wherein the heat sink group includes a chassis, a heat exchanger, a liquid-cooled radiator and a liquid supply assembly; the invention only needs to reserve operating space for pipe disassembly and assembly at one end of the heat exchanger and the liquid-cooled radiator, which can effectively improve the space utilization rate in the chassis, reduce the size of the chassis, and at the same time improve the convenience of disassembly and maintenance, solving the problem of affected work efficiency.

[0006] The specification of Chinese invention patent CN109842275B discloses a heat dissipation structure and a frequency converter for use in the frequency converter. The heat dissipation structure includes a circuit heating module in the frequency converter and a microchannel heat sink for dissipating heat from the circuit heating module. The heat dissipation structure of the invention innovatively uses a microchannel heat sink to dissipate heat from the circuit heating module in the frequency converter, effectively improving the heat dissipation effect of the circuit heating module, thereby better ensuring the working reliability of the frequency converter.

[0007] The existing radiator is not convenient to adjust the heat dissipation work according to the use environment and working conditions. When the workload is large and the ambient temperature is high, it is not easy to ensure that the inverter temperature can be quickly reduced. Summary of the invention

[0008] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing radiator is inconvenient to adjust the heat dissipation work according to the use environment and working conditions. When the workload is large and the ambient temperature is high, it is not easy to ensure that the inverter temperature can be quickly reduced.

[0009] In order to solve the above problems, the present invention provides a heat dissipation structure of an inverter, comprising an inverter housing, a power unit is installed in the inverter housing, and a heat sink group is installed at one end of the inverter housing; the heat sink group comprises a heat exchange substrate, a plurality of evenly distributed heat exchange fins are fixedly connected to one end of the heat exchange substrate away from the inverter housing, and a heat exchange baffle is fixedly connected to one end of the heat exchange substrate located in the inverter housing;

[0010] Both ends of the inverter housing are equipped with air cooling structures matching the heat sink group; a cover plate covering the heat sink group is connected between a pair of air cooling structures; both ends of the heat sink group are equipped with heat exchange switching structures, the heat exchange switching structure includes a baffle door, and the baffle door includes a fixed frame and a movable door;

[0011] A first driven shaft is connected between the movable door and the sealing frame, a stepper motor is installed on the sealing frame, and a power shaft is rotatably connected to the upper end of the fixed frame. The power shaft includes a main rotating shaft fixedly connected to the power output end of the stepper motor, a main gear matched with the first driven shaft is fixedly connected to the main rotating shaft, one end of the first driven shaft is fixedly connected to a first gear meshing with the main gear, a movable gear is slidably connected to the main rotating shaft, one end of the main rotating shaft is fixedly connected to an electromagnet matched with the movable gear, a second driven shaft is rotatably connected to the heat exchange baffle, a second gear and a sub-baffle are fixedly connected to the second driven shaft, the second gear matches the movable gear, and air vents matching the position of the sub-baffle are provided at both ends of the inverter housing.

[0012] In the heat dissipation structure of the inverter, the switching of the heat dissipation area is realized, and the heat dissipation work can be adjusted according to the use environment and the working state of the inverter.

[0013] As a further improvement of the present application, the fixed frame covers the cross-section of multiple heat exchange fins, the movable door covers the cross-section of the space between two adjacent heat exchange fins, and the fixed frame is provided with multiple through holes matching the movable door.

[0014] As a further improvement of the present application, the width of the through hole is smaller than the width of the movable door, a sealing strip is installed on the movable door, a plurality of sealing grooves matching the movable door are opened on the through hole, and when the movable door is fitted with the fixed frame, the through hole is closed by the movable door.

[0015] As a further improvement of the present application, a plurality of heat dissipation holes are provided on the side wall of the inverter housing, and the heat exchange baffle covers the power unit in the inverter housing and is opposite to the plurality of heat dissipation holes.

[0016] As a further improvement of the present application, the heat exchange fins are in the shape of rectangular strips, and the cover plate is provided with sockets matching the heat exchange fins, and the top ends of the heat exchange fins are interference fit with the sockets.

[0017] As a further improvement of the present application, the air cooling structure includes a pair of mounting frames, in which axial flow fans are installed, and a sealing frame covering the heat sink group is connected between the pair of mounting frames. The pair of air cooling structures are each installed with three axial flow fans, the axial flow fan in the middle rotates counterclockwise, and the other two axial flow fans rotate clockwise. The multiple heat exchange fins are divided into three groups that match the three axial flow fans respectively, and the two groups of heat exchange fins located on both sides are provided with guide holes near one end of the fixed frame.

[0018] As another improvement of the present application, a magnetic counterweight is installed on the top of the auxiliary baffle, a permanent magnet is installed on the movable gear, and the electromagnet starts working when the movable door rotates to 0 degrees or 90 degrees.

[0019] As another improved supplement of the present application, an auxiliary heat dissipation system is also included, the auxiliary heat dissipation system includes a processor, and the processor is connected to a control module, a data processing module and a monitoring module;

[0020] The control module is used to control the heat exchange switching structure to switch the heat dissipation area and adjust the multiple axial flow fans. The heat dissipation area includes the inner space and the area corresponding to the heat exchange fins;

[0021] The monitoring module is used to collect monitoring data, including the operating temperature and ambient temperature of the power unit;

[0022] The data processing module is used to process the monitoring data and select the preset program, and the control module executes the preset program after selection.

[0023] As another improvement supplement of the present application, a synchronous cooling mode is provided in the control module. When the synchronous cooling mode is working, the stepper motor is first controlled to rotate the second driven shaft 90 degrees, thereby opening the auxiliary baffle, and then the electromagnet is controlled to separate the movable gear from the second gear, and finally the stepper motor is controlled to reverse the set angle to make the movable door half-open.

[0024] In summary, the opening and closing states of the sub-baffle and the movable door, as well as the speed of the axial fan, are controlled by the working state of the inverter and the ambient temperature, so that the inverter housing can be cooled to adapt to environmental and working changes; this not only improves the heat dissipation efficiency of the inverter and extends its service life, but also ensures the stable operation of the equipment in different working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of the frequency converter according to the first and second embodiments of the present application;

[0026] Figure 2 It is a side cross-sectional view of the frequency converter of the first and second embodiments of the present application;

[0027] Figure 3 for Figure 2 The structural diagram at A in the middle;

[0028] Figure 4 This is a front cross-sectional view of the frequency converter according to the first and second embodiments of the present application;

[0029] Figure 5 It is a partial cross-sectional view of the heat exchange switching structure of the first and second embodiments of the present application;

[0030] Figure 6 This is a schematic diagram of the open state of the movable door in the first and second embodiments of the present application;

[0031] Figure 7 The two movable doors of the first and second embodiments of the present application are respectively in the open and closed states of the airflow path diagram;

[0032] Figure 8 This is a system block diagram of the first and second implementation modes of this application;

[0033] Fig. 9 This is a working logic diagram of the first and second implementation modes of this application.

[0034] Description of the numbers in the figure:

[0035] 1. Inverter housing; 2. Heat sink assembly; 21. Heat exchange substrate; 22. Heat exchange fins; 23. Heat exchange baffle; 3. Air cooling structure; 31. Mounting frame; 32. Axial flow fan; 33. Sealing frame; 4. Cover plate; 5. Baffle door; 51. Fixed frame; 52. Movable door; 53. First driven shaft; 6. Power shaft; 61. Main shaft; 62. Main gear; 63. Movable gear; 7. Second driven shaft; 71. Auxiliary baffle. DETAILED DESCRIPTION

[0036] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0037] The first implementation method:

[0038] Figure 1-7 It shows a heat dissipation structure of a frequency converter, comprising a frequency converter housing 1, a power unit is installed in the frequency converter housing 1, and a heat sink group 2 is installed at one end of the frequency converter housing 1;

[0039] The heat sink group 2 includes a heat exchange substrate 21, and one end of the heat exchange substrate 21 away from the inverter housing 1 is fixedly connected to a plurality of evenly distributed heat exchange fins 22, and one end of the heat exchange substrate 21 located in the inverter housing 1 is fixedly connected to a heat exchange baffle 23, which is fixed to the outside of the power unit to expand the heat exchange area and assist in positioning;

[0040] Both ends of the inverter housing 1 are equipped with air cooling structures 3 matching the heat sink group 2; the air cooling structure 3 includes a pair of mounting frames 31, an axial flow fan 32 is installed in the mounting frames 31, and a sealing frame 33 covering the heat sink group 2 is connected between the pair of mounting frames 31;

[0041] A cover plate 4 covering the heat sink group 2 is connected between a pair of air cooling structures 3; the heat exchange fins 22 are in a rectangular strip shape, and a socket matching the heat exchange fins 22 is provided on the cover plate 4, and the top of the heat exchange fin 22 is interference fit with the socket.

[0042] Both ends of the heat sink group 2 are equipped with a heat exchange switching structure, which includes a baffle door 5, and the baffle door 5 includes a fixed frame 51 and a movable door 52. The two fixed frames 51 respectively cover the cross-sections of both ends of a plurality of heat exchange fins 22, and the movable door 52 covers the cross-section of the space between two adjacent heat exchange fins 22. The fixed frame 51 is provided with a plurality of through holes matching the movable door 52, and the through holes are located between two adjacent heat exchange fins 22.

[0043] A first driven shaft 53 is connected between the movable door 52 and the sealing frame 33, a stepping motor is installed on the sealing frame 33, the upper end of the fixed frame 51 is rotatably connected to a power shaft 6, the power shaft 6 includes a main rotating shaft 61 fixedly connected to the power output end of the stepping motor, a main gear 62 matching the first driven shaft 53 is fixedly connected to the main rotating shaft 61, a first gear meshing with the main gear 62 is fixedly connected to one end of the first driven shaft 53, a movable gear 63 is slidably connected to the main rotating shaft 61, and the movable gear 63 is sleeved on the main rotating shaft 61 and is connected to the main rotating shaft 61 rotates synchronously, one end of the main shaft 61 is fixedly connected with an electromagnet matching with the movable gear 63, a permanent magnet is installed in the movable gear 63, and the electromagnet attracts or repels the permanent magnet when working, thereby causing the movable gear 63 to move along the main shaft 61, a second driven shaft 7 is rotatably connected to the heat exchange baffle 23, a second gear and a sub-baffle 71 are fixedly connected to the second driven shaft 7, the second gear matches with the movable gear 63, and air holes matching with the position of the sub-baffle 71 are provided at both ends of the inverter housing 1, and a dust net is installed in the air hole.

[0044] The width of the through hole is smaller than that of the movable door 52 . A sealing strip is installed on the movable door 52 . A plurality of sealing grooves matching the movable door 52 are provided on the through hole. When the movable door 52 is fitted with the fixed frame 51 , the through hole is closed by the movable door 52 .

[0045] A plurality of heat dissipation holes are provided on the side wall of the inverter housing 1, and the heat exchange baffle 23 covers the power unit in the inverter housing 1 and is opposite to the plurality of heat dissipation holes;

[0046] A magnetic counterweight is installed at the top of the auxiliary baffle 71, and a permanent magnet is installed on the movable gear 63. The electromagnet starts working when the movable door 52 rotates to 0 degrees or 90 degrees. The magnetic counterweight is used to fix the auxiliary baffle 71 when it is opened or closed. When the auxiliary baffle 71 rotates 90 degrees to open, the magnetic counterweight is attracted to the heat exchange baffle 23 to maintain the open state. When the auxiliary baffle 71 is not rotated, the vent is closed. At this time, the magnetic counterweight attracts the inner wall of the inverter housing 1 to achieve fixation to ensure that the vent is completely closed.

[0047] A pair of air cooling structures 3 are each equipped with three axial flow fans 32, the axial flow fan 32 in the middle rotates counterclockwise, and the other two axial flow fans 32 rotate clockwise, and the multiple heat exchange fins 22 are divided into three groups respectively matched with the three axial flow fans 32, and the two groups of heat exchange fins 22 located on both sides are provided with guide holes at one end close to the fixed frame 51;

[0048] When the present solution is working normally, the movable door 52 is in an open state, and at least one axial flow fan 32 is controlled to work, so that the external airflow passes through the two air cooling structures 3 and exchanges heat with the multiple heat exchange fins 22, so that the heat of the power unit is dissipated through the heat exchange fins 22;

[0049] During normal operation, other axial flow fans 32 rotating in the same direction as the already turned on axial flow fan 32 may be turned on according to the increase in the operating temperature of the power unit to increase the flow rate of the airflow passing through the heat exchange fins 22 and improve the cooling efficiency;

[0050] During operation, the inverter temperature and the external ambient temperature are monitored by the temperature sensor in the inverter housing 1. When the monitored ambient temperature or the temperature in the inverter housing 1 exceeds the set threshold, the stepper motor is controlled to rotate the power shaft 6; then the first driven shaft 53 drives the movable door 52 to close, and at the same time the second driven shaft 7 rotates to open the auxiliary baffle 71, and then the air vent is opened. At this time, the airflow introduced by the axial flow fan 32 enters the inverter housing 1 and directly exchanges heat with the power unit. At this time, the axial flow fans 32 on the two air-cooling structures 3 both input airflow in the direction of the inverter housing 1, and the airflow is discharged through the heat dissipation holes on the inverter housing 1, so that a large amount of cooling airflow is input into the inverter housing 1 to directly exchange heat with the power unit, thereby achieving rapid cooling of the power unit.

[0051] During operation, according to the change of heat dissipation efficiency and the external air condition, the electromagnet is controlled to work, so that the second gear and the movable gear 63 are separated or matched, so that the auxiliary baffle 71 and the movable door 52 move synchronously or the movable door 52 moves independently;

[0052] Optionally, during specific operation, the two stepper motors can be controlled to work separately, so that the two movable doors 52 are respectively in the closed and open states, the auxiliary baffle 71 at the position of the movable door 52 in the closed state is adjusted to the open state, and the auxiliary baffle 71 at the position of the movable door 52 in the open state is adjusted to the closed state. At this time, the three axial flow fans 32 near the position of the movable door 52 in the open state are all turned on. At this time, the airflow is introduced into the two groups of heat exchange fins 22 by the two axial flow fans 32, and the airflow enters the heat exchange fins 22 located in the middle through the guide holes on the top of the heat exchange fins 22, and is guided by the heat exchange fins 22 and led out by the axial flow fan 32 rotating counterclockwise in the middle, as shown in FIG. Figure 7 Shown;

[0053] At this time, another air cooling structure 3 controls two axial flow fans 32 to blow air, so that the air flow is directly blown into the inverter housing 1 to cool the power unit, thereby realizing a power unit heat dissipation method combining heat exchange fins 22 with direct air cooling;

[0054] During specific work, the user can set any one or more of the above heat dissipation methods of the inverter heat dissipation structure of this solution according to needs;

[0055] It should be noted that when the auxiliary baffle 71 is opened to introduce external cooling airflow, it is necessary to ensure that the external environmental humidity and air quality are within the set safety range to prevent a large amount of external humid air and dust from entering the inverter housing 1 and contaminating the power unit.

[0056] Second implementation method:

[0057] Figure 8-9 As shown, it also includes an auxiliary heat dissipation system, which includes a processor, and the processor is connected to a control module, a data processing module and a monitoring module;

[0058] The control module is used to control the heat exchange switching structure to switch the heat dissipation area and adjust the multiple axial flow fans 32. The heat dissipation area includes the inner space and the area corresponding to the heat exchange fins 22.

[0059] The monitoring module is used to collect monitoring data, including the operating temperature of the power unit and the ambient temperature; a temperature sensor for monitoring the operating temperature of the power unit is installed in the inverter housing 1, and a temperature and humidity sensor for monitoring the ambient temperature and humidity is installed at the outer end of the inverter housing 1;

[0060] The data processing module is used to process the monitoring data and select the preset program. After the preset program is selected, the control module executes it. When the data processing module processes the monitoring data, it analyzes and obtains the heat dissipation efficiency under the current working mode according to the changes in the temperature monitoring data.

[0061] During normal operation of this solution, heat is dissipated by fans arranged on the upper and lower sides of the inverter; during heat dissipation, air flows into the inverter housing 1 through the through holes on 2;

[0062] A synchronous cooling mode is set in the control module. When the synchronous cooling mode is working, the stepper motor is first controlled to rotate the second driven shaft 7 90 degrees, thereby opening the auxiliary baffle 71, and then the electromagnet is controlled to separate the movable gear 63 from the second gear. Finally, the stepper motor is controlled to reverse the set angle to make the movable door 52 in a half-open state. The synchronous cooling mode is manually selected to be turned on by technical personnel in this field as needed, and a control panel matching the auxiliary heat dissipation system is provided on the inverter housing 1.

[0063] Optionally, those skilled in the art may set the synchronous cooling mode to be automatically turned on when the heat dissipation efficiency is lower than a set value.

[0064] In summary, the present embodiment uses an auxiliary heat dissipation system to precisely control the heat exchange switching structure and the axial flow fan 32 to achieve switching of the heat dissipation area and precise control of the airflow. The monitoring module continuously monitors the temperature of the power unit and the ambient temperature to provide real-time data support for the data processing module. The data processing module analyzes the heat dissipation efficiency under the current working mode based on the changes in the monitoring data, and selects the most suitable preset program to optimize the heat dissipation performance. When the heat dissipation efficiency is lower than the preset threshold, the system can automatically adjust the operation of the heat exchange switching structure or start the synchronous cooling mode. By finely controlling the opening and closing states of the auxiliary baffle 71 and the movable door 52, as well as the rotation speed of the axial flow fan 32, the power unit in the inverter housing 1 can be quickly cooled down to adapt to environmental and working changes. This design not only improves the heat dissipation efficiency of the inverter and extends its service life, but also ensures the stable operation of the equipment under different working environments.

[0065] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A heat dissipation structure of a frequency converter, comprising a frequency converter housing (1), wherein a power unit is installed in the frequency converter housing (1), characterized in that: A heat sink group (2) is installed at one end of the inverter housing (1); the heat sink group (2) comprises a heat exchange substrate (21); one end of the heat exchange substrate (21) away from the inverter housing (1) is fixedly connected to a plurality of evenly distributed heat exchange fins (22); and one end of the heat exchange substrate (21) located inside the inverter housing (1) is fixedly connected to a heat exchange baffle (23); Both ends of the inverter housing (1) are equipped with air cooling structures (3) matching the heat sink group (2); a cover plate (4) covering the heat sink group (2) is connected between a pair of the air cooling structures (3); both ends of the heat sink group (2) are equipped with a heat exchange switching structure, the heat exchange switching structure comprising a baffle door (5), the baffle door (5) comprising a fixed frame (51) and a movable door (52); A first driven shaft (53) is connected between the movable door (52) and the sealing frame (33); a stepping motor is mounted on the sealing frame (33); the upper end of the fixed frame (51) is rotatably connected to a power shaft (6); the power shaft (6) comprises a main rotating shaft (61) fixedly connected to a power output end of the stepping motor; a main gear (62) matching the first driven shaft (53) is fixedly connected to the main rotating shaft (61); one end of the first driven shaft (53) is fixedly connected to a gear (62) matching the main gear (62) a first gear meshing with the main shaft (61), a movable gear (63) being slidably connected to the main shaft (61), an electromagnet matching the movable gear (63) being fixedly connected to one end of the main shaft (61), a second driven shaft (7) being rotatably connected to the heat exchange baffle (23), a second gear and a secondary baffle (71) being fixedly connected to the second driven shaft (7), the second gear matching the movable gear (63), and air holes matching the position of the secondary baffle (71) being provided at both ends of the inverter housing (1); During normal operation, the movable door (52) is in an open state, allowing external airflow to pass through the two air cooling structures (3) and exchange heat with the plurality of heat exchange fins (22), so that the heat of the power unit is dissipated through the heat exchange fins (22); When the monitored ambient temperature or the temperature inside the inverter housing (1) exceeds a set threshold, the stepper motor is controlled to operate so that the power shaft (6) rotates; thereby, the first driven shaft (53) drives the movable door (52) to close, and at the same time, the second driven shaft (7) rotates to open the auxiliary baffle (71), thereby opening the air vent. At this time, the airflow introduced by the axial flow fan (32) enters the inverter housing (1) and directly exchanges heat with the power unit.

2. The heat dissipation structure of a frequency converter according to claim 1, characterized in that: The fixed frame (51) covers the cross-section of a plurality of heat exchange fins (22), the movable door (52) covers the cross-section of the space between two adjacent heat exchange fins (22), and the fixed frame (51) is provided with a plurality of through holes matching the movable door (52).

3. The heat dissipation structure of a frequency converter according to claim 2, characterized in that: The width of the through hole is smaller than the width of the movable door (52); a sealing strip is installed on the movable door (52); a plurality of sealing grooves matching the movable door (52) are provided on the through hole; when the movable door (52) is fitted to the fixed frame (51), the through hole is closed by the movable door (52).

4. The heat dissipation structure of a frequency converter according to claim 1, characterized in that: A plurality of heat dissipation holes are provided on the side wall of the inverter housing (1); the heat exchange baffle (23) covers the power unit in the inverter housing (1) and is opposite to the plurality of heat dissipation holes.

5. The heat dissipation structure of a frequency converter according to claim 1, characterized in that: The heat exchange fin (22) is in the shape of a rectangular strip, and a plug hole matching the heat exchange fin (22) is provided on the cover plate (4), and the top end of the heat exchange fin (22) is interference fit with the plug hole.

6. The heat dissipation structure of a frequency converter according to claim 1, characterized in that: The air cooling structure (3) comprises a pair of mounting frames (31), an axial flow fan (32) is mounted in the mounting frames (31), a sealing frame (33) covering the heat sink group (2) is connected between the pair of mounting frames (31), three axial flow fans (32) are mounted on each of the pair of air cooling structures (3), the axial flow fan (32) located in the middle rotates counterclockwise, and the other two axial flow fans (32) rotate clockwise, the plurality of heat exchange fins (22) are divided into three groups respectively matched with the three axial flow fans (32), and the two groups of heat exchange fins (22) located on both sides are provided with guide holes at one end close to the fixed frame (51).

7. The heat dissipation structure of a frequency converter according to claim 5, characterized in that: A magnetic counterweight is mounted on the top of the auxiliary baffle (71), a permanent magnet is mounted on the movable gear (63), and the electromagnet is turned on when the movable door (52) rotates to 0 degrees or 90 degrees.

8. The heat dissipation structure of a frequency converter according to claim 1, characterized in that: It also includes an auxiliary heat dissipation system, which includes a processor, and the processor is connected to a control module, a data processing module and a monitoring module; The control module is used to control the heat exchange switching structure to switch the heat dissipation area and regulate the multiple axial flow fans (32), the heat dissipation area including the inner space and the area corresponding to the heat exchange fins (22); The monitoring module is used to collect monitoring data, and the monitoring data includes the operating temperature and ambient temperature of the power unit; The data processing module is used to process monitoring data and select a preset program, and the control module executes the preset program after selection.

9. The heat dissipation structure of a frequency converter according to claim 8, characterized in that: The control module is provided with a synchronous cooling mode. When the synchronous cooling mode is in operation, the stepper motor is first controlled to operate so that the second driven shaft (7) rotates 90 degrees, thereby opening the auxiliary baffle (71). The electromagnet is then controlled to operate so that the movable gear (63) is separated from the second gear. Finally, the stepper motor is controlled to reverse to a set angle so that the movable door (52) is in a half-open state.

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