A heat dissipation component for a power frequency converter

Abstract

This utility model relates to the field of frequency converter technology and discloses a heat dissipation component for a power frequency converter. The heat dissipation component of this utility model, through a control mechanism, calculates the optimal heat dissipation intensity (i.e., fan speed command) required by the intelligent control module based on accurate temperature data fed back in real time from a temperature sensor, thereby achieving variable frequency speed regulation. For example, when the heat load is small (such as light load or low ambient temperature), the fan can operate at a low speed, providing just the required heat dissipation capacity; when the heat load increases (such as heavy load or rising ambient temperature), the fan speed can smoothly and linearly increase, providing stronger airflow for heat dissipation. This improves the low heat dissipation efficiency caused by fixed speed full-on / full-off operation in traditional methods.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, and specifically to a heat dissipation component for a power frequency converter. Background Technology

[0002] As a core power electronic device, the frequency converter (FD) achieves precise and continuous adjustment of the motor speed by changing the frequency of the power supply to the AC motor. In use, it can meet the precise speed control requirements of complex processes and achieve "soft start / soft stop" of the motor, effectively reducing mechanical shock. More importantly, variable frequency speed control technology is a recognized high-efficiency energy-saving method, significantly reducing power consumption by operating the motor at its optimal load point. Therefore, FDs are widely used in many fields such as industrial production, building automation, new energy power generation, and transportation.

[0003] During operation, inverters generate a significant amount of heat from their internal power semiconductor devices (such as IGBTs). If this heat cannot be dissipated effectively and promptly, the device temperature will rise, potentially affecting performance stability or even causing equipment malfunction or damage. Currently, air cooling is the most common and mainstream solution for inverter heat dissipation. Its basic structure and working principle are as follows: a cooling fan and corresponding ventilation openings (inlet and outlet) are installed on the inverter housing. When the cooling fan operates, it forces cool air from the external environment to flow through the heat-generating components inside the inverter (usually through heat sink fins). The cool air absorbs heat, its temperature rises, and then it is exhausted to the outside of the equipment by the fan. Through this continuous airflow and heat exchange with the heat-generating components, the heat generated inside the inverter is carried away, thus achieving cooling. To control the fan's operation, existing technologies typically employ a temperature threshold-based control strategy. That is, when the temperature at a certain point (or average) inside the inverter reaches a preset activation threshold, the cooling fan is activated; when the temperature drops below the shutdown threshold, the fan stops operating.

[0004] However, this control method relies on a fixed temperature threshold for its switching action, making it unable to make precise, linear adjustments based on changes in the actual heat load. For example, the fan may start too early or shut down too late before the temperature reaches the critical point required for heat dissipation. This results in low heat dissipation efficiency, increases the overall power consumption of the inverter system, and raises the user's operating costs. Utility Model Content

[0005] In view of this, the present invention provides a heat dissipation component for a power frequency converter to solve the problem that traditional heat dissipation methods can only achieve start-up and shutdown actions, which leads to low heat dissipation efficiency.

[0006] This utility model provides a heat dissipation assembly for a power frequency converter, comprising a frequency converter body, a heat dissipation mechanism, and a control mechanism. The frequency converter body has a heat dissipation cavity and a mounting cavity inside, the mounting cavity being connected to the heat dissipation cavity and used for mounting components. The heat dissipation mechanism includes a fan mounted within the heat dissipation cavity. The control mechanism includes a mounting panel and a temperature sensor, an intelligent control module, and a variable frequency speed control module mounted on the mounting panel. The mounting panel is mounted within the heat dissipation cavity, with the detection end of the temperature sensor facing the mounting cavity to detect its temperature. The intelligent control module is communicatively connected to the temperature sensor, receiving the temperature data detected by the sensor and generating a heat dissipation intensity command suitable for the current temperature. The variable frequency speed control module is communicatively connected to the intelligent control module, receiving the heat dissipation intensity command issued by the intelligent control module, and is also communicatively connected to the fan motor.

[0007] Beneficial effects: By setting up a control mechanism, the intelligent control module calculates the optimal heat dissipation intensity (i.e., fan speed command) required at the moment based on accurate temperature data fed back from the temperature sensor in real time, thus achieving variable frequency speed regulation. For example, when the heat load is small (such as light load or low ambient temperature), the fan can run at a low speed, providing just the required heat dissipation capacity; when the heat load increases (such as heavy load or rising ambient temperature), the fan speed can be increased smoothly and linearly, providing stronger airflow for heat dissipation. This improves the low heat dissipation efficiency caused by fixed speed full on / off operation in traditional methods.

[0008] In one optional embodiment, the heat dissipation cavity is located above the mounting cavity, and the heat dissipation cavity has an opening on the side opposite to the mounting cavity; the heat dissipation mechanism further includes a heat dissipation frame, which is detachably mounted at the opening of the heat dissipation cavity by a disassembly mechanism.

[0009] Beneficial effects: The disassembly mechanism allows for convenient assembly and disassembly of the heat sink frame, enabling users to remove or replace it from the heat dissipation cavity opening without the need for complex tools. For example, when the heat sink frame experiences reduced heat dissipation efficiency due to dust accumulation during long-term operation, it can be quickly disassembled and cleaned, significantly shortening maintenance time and reducing equipment downtime losses.

[0010] In one optional embodiment, the inner wall of the heat dissipation cavity of the inverter body is provided with an installation groove; the heat dissipation frame is provided with an installation block adapted to the installation groove, and the installation block is provided with a snap-fit ​​groove; the disassembly mechanism includes a limiting member and a snap-fit ​​block, the snap-fit ​​block slides horizontally on the end face where the opening of the heat dissipation cavity is located, the snap-fit ​​block is fixed in the height direction, and under the action of external force, the snap-fit ​​block is inserted into the snap-fit ​​groove or taken out from the snap-fit ​​groove.

[0011] Beneficial effects: By fixing the snap-fit ​​block in the height direction, when the snap-fit ​​block is fully inserted into the snap-fit ​​slot of the heat sink mounting block under the action of horizontal external force, the mounting block is locked, preventing any tendency of the mounting block (along with the entire heat sink) to move in the vertical direction (i.e., the direction away from the heat sink cavity), ensuring the long-term stable positioning of the heat sink system and guaranteeing the continuity of the heat sink effect.

[0012] In one optional embodiment, the disassembly mechanism further includes a mounting base and a handle. The mounting base is fixedly mounted on the end face where the opening of the heat dissipation cavity is located, along the sliding direction of the locking block. The mounting base is located on the side of the locking block opposite to the mounting block, and the mounting base has an internal threaded hole. The handle has an external threaded protrusion and a handle portion. The external threaded protrusion and the internal threaded hole form a threaded transmission pair. The axial direction of the external threaded protrusion is parallel to the sliding direction of the locking block. One end of the external threaded protrusion along its axial direction is used to push the limiting member. The handle portion is mounted on the other end of the external threaded protrusion along its axial direction. An external force rotates the handle portion, driving the external threaded protrusion to move along its axial direction, thereby pushing the locking block to move along its sliding direction.

[0013] Beneficial effects: The threaded transmission pair formed by the external threaded protrusion of the handle and the internal threaded hole of the mounting base converts the user's rotational motion of the handle into the axial linear motion of the external threaded protrusion, achieving high-precision displacement control and ensuring that the locking block is smoothly and accurately inserted into the locking groove in the horizontal direction. Simultaneously, due to the self-locking property of the threaded pair (such as the characteristics of trapezoidal or sawtooth threads), it prevents the locking block from undergoing unexpected displacement due to vibration or external force in non-operating states, ensuring that the heat sink frame position meets expectations.

[0014] In one optional embodiment, the limiting member is further provided with a pressure plate, which is installed above the snap-fit ​​block; the lower side of the end of the pressure plate near the mounting base is provided with an arc-shaped protrusion; the mounting block is provided with an arc-shaped transition surface; wherein, when the snap-fit ​​block is inserted into the snap-fit ​​groove, the pressure plate is used to abut against the top of the mounting block.

[0015] Beneficial effects: By setting arc-shaped protrusions and arc-shaped transition surfaces, during the movement of the snap-fit ​​block toward the snap-fit ​​slot, the arc-shaped protrusion on the lower side of the pressure plate end will first contact the arc-shaped transition surface on the top of the mounting block, providing vertical constraint and preventing the mounting block from accidentally jumping or shaking during subsequent operations. This maintains the stability of the heat sink frame in the horizontal and initial height directions, allowing the snap-fit ​​block to find and insert into the snap-fit ​​slot more smoothly and accurately.

[0016] In one optional embodiment, the heat dissipation frame has an air inlet and an air outlet; the heat dissipation mechanism also includes a dust filter. A pair of dust filters are provided, respectively installed at the air inlet and air outlet of the heat dissipation frame.

[0017] Beneficial effects: The dust filter at the air inlet acts as a first line of defense, effectively filtering most solid particles in the intake airflow and reducing the risk of contaminants entering the heat dissipation chamber from the mounting cavity. The dust filter at the air outlet acts as another line of defense, directly intercepting dust, particulate matter, and other contaminants carried by the external environment, preventing them from entering the heat dissipation chamber of the inverter body. By setting up two lines of defense, the phenomenon of dust accumulation can be improved, reducing the risk of decreased heat dissipation efficiency and electrostatic adsorption, and extending the service life of the equipment.

[0018] In one optional embodiment, the heat sink frame has an internal mounting chamber; the heat dissipation mechanism further includes a mounting bracket. The mounting bracket is mounted inside the mounting chamber; the fan is mounted on the mounting bracket.

[0019] Beneficial effect: By setting up a mounting bracket in the mounting chamber inside the heat sink, a sturdy and stable mounting base is provided for the fan.

[0020] In one alternative embodiment, the heat dissipation mechanism further includes a protective cover for covering the motor of the fan.

[0021] Beneficial effects: By installing a protective cover, a physical barrier is provided for the fan motor, effectively preventing external foreign objects from directly impacting, falling into, or becoming entangled on the high-speed rotating motor housing, terminals, or cooling fan blades. This avoids serious mechanical failures such as motor housing deformation, blade breakage, terminal damage, or even jamming and stopping. Simultaneously, it effectively prevents dust and other contaminants from entering the motor, reducing frictional losses and lowering the risk of short circuits.

[0022] In one optional embodiment, the protective cover has an installation area and an empty area, the installation area being mounted on a mounting frame; the protective cover has ventilation holes located below the empty area.

[0023] Beneficial effects: By installing the mounting area of ​​the protective cover on the mounting frame, the protective cover can be connected and fixed to the mounting frame. Furthermore, by providing an empty area on the protective cover and placing the air vent below the empty area, it is ensured that the introduced cold airflow (from the cooling fan) can pass directly and smoothly through the air vent and flow vertically upwards to the area above the empty area. This effectively removes the heat generated during motor operation and ensures long-term reliable operation of the motor.

[0024] In one optional embodiment, the inverter body is further provided with an air inlet, which communicates with the mounting cavity.

[0025] Beneficial effects: Because the fan is located inside the heat dissipation cavity, it generates a low-pressure area within the cavity during rotation. Furthermore, since the mounting cavity is connected to the heat dissipation cavity, and an air inlet connected to the mounting cavity allows external cool air to enter, forming a closed-loop airflow path with the fan's forced exhaust. For example, during inverter operation, cool air enters the mounting cavity through the air inlet, absorbs heat generated by heat-generating components (such as IGBT modules and capacitors), enters the heat dissipation cavity, and is then exhausted. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of the heat dissipation assembly of the power frequency converter provided in the embodiment of this utility model;

[0028] Figure 2 A schematic diagram of the internal structure of the heat dissipation cavity of the power inverter heat dissipation component provided in an embodiment of this utility model;

[0029] Figure 3 A schematic diagram of the structure of the heat dissipation component control mechanism of the power inverter provided in an embodiment of this utility model;

[0030] Figure 4 for Figure 1 A magnified view of part A in the middle;

[0031] Figure 5 A schematic diagram of the heat dissipation mechanism of the power inverter heat dissipation assembly provided in this embodiment of the utility model, with one side of the dust filter removed;

[0032] Figure 6 A plan view of the protective cover in the heat dissipation mechanism of the power inverter heat dissipation assembly provided in this embodiment of the utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Inverter body; 101. Heat dissipation cavity; 102. Mounting slot; 103. Air inlet; 104. Mounting plate; 105. Heat dissipation holes;

[0035] 2. Heat dissipation mechanism; 21. Fan; 22. Heat sink frame; 221. Mounting block; 222. Snap-fit ​​slot; 223. Mounting chamber; 224. Arc-shaped transition surface; 23. Dust filter; 24. Mounting bracket; 25. Protective cover; 251. Air vent; 252. Mounting area; 253. Unused area;

[0036] 3. Control mechanism; 31. Mounting panel; 32. Temperature sensor; 33. Intelligent control module; 34. Variable frequency speed control module;

[0037] 4. Disassembly mechanism; 41. Limiting component; 411. Snap-fit ​​block; 412. Pressure plate; 413. Arc-shaped protrusion; 42. Mounting base; 43. Handle component; 431. External thread protrusion; 432. Handle part. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a heat dissipation assembly for a power frequency converter is provided, comprising a frequency converter body 1, a heat dissipation mechanism 2, and a control mechanism 3.

[0041] The inverter body 1 has a heat dissipation cavity 101 and a mounting cavity inside. The mounting cavity is connected to the heat dissipation cavity 101 and is used to mount components.

[0042] The heat dissipation mechanism 2 includes a fan 21, which is installed inside the heat dissipation cavity 101.

[0043] The control mechanism 3 includes a mounting panel 31 and a temperature sensor 32, an intelligent control module 33, and a variable frequency speed control module 34 mounted on the mounting panel 31. The mounting panel 31 is installed inside the heat dissipation cavity 101. The detection end of the temperature sensor 32 faces the mounting cavity and is used to detect the temperature of the mounting cavity. The intelligent control module 33 is communicatively connected to the temperature sensor 32 and is used to receive the temperature data detected by the temperature sensor 32 and generate a heat dissipation intensity command suitable for the current temperature. The variable frequency speed control module 34 is communicatively connected to the intelligent control module 33 and is used to receive the heat dissipation intensity command issued by the intelligent control module 33. The variable frequency speed control module 34 is also communicatively connected to the motor of the fan 21.

[0044] With this setup, by setting up the control mechanism 3, the intelligent control module 33 calculates the optimal heat dissipation intensity (i.e., the fan speed command 21) required at the moment based on the accurate temperature data fed back in real time by the temperature sensor 32, thereby achieving variable frequency speed regulation.

[0045] For example, when the heat load is low (such as light load or low ambient temperature), fan 21 can operate at low speed, providing just the required cooling capacity; when the heat load increases (such as heavy load or rising ambient temperature), the fan speed of fan 21 can increase smoothly and linearly, providing stronger airflow for cooling. This improves the low cooling efficiency caused by fixed speed full on / off operation in traditional methods.

[0046] When in use, the data detected by the temperature sensor 32 is processed by the intelligent control module 33, which will generate a heat dissipation intensity command suitable for the current temperature. Different heat dissipation intensity commands correspond to different motor output power, thereby controlling the speed of the fan 21 to meet the current requirements and ensuring that the frequency converter works within a stable temperature range.

[0047] It can be explained that a mounting through hole is provided in the middle of the connection between the heat dissipation cavity 101 and the mounting cavity. The mounting panel 31 is installed in the mounting through hole, and the temperature sensor 32 faces the mounting cavity to detect the temperature inside the mounting cavity in real time.

[0048] In one embodiment, the heat dissipation cavity 101 is located above the mounting cavity, and the heat dissipation cavity 101 has an opening on the side opposite to the mounting cavity; the heat dissipation mechanism 2 also includes a heat dissipation frame 22, which is detachably installed at the opening of the heat dissipation cavity 101 by means of the disassembly mechanism 4.

[0049] With this configuration, the heat sink 22 can be easily disassembled and reassembled by the disassembly mechanism 4. Users can remove or replace the heat sink 22 from the opening of the heat dissipation cavity 101 without using complicated tools.

[0050] For example, when the heat dissipation frame 22 accumulates dust due to long-term operation, resulting in a decrease in heat dissipation efficiency, it can be quickly disassembled and cleaned, significantly shortening maintenance time and reducing equipment downtime losses.

[0051] In one embodiment, the inner wall of the heat dissipation cavity 101 of the inverter body 1 is provided with a mounting groove 102; the heat dissipation frame 22 is provided with a mounting block 221 adapted to the mounting groove 102, and the mounting block 221 is provided with a snap-fit ​​groove 222; the disassembly mechanism 4 includes a limiting member 41 and a snap-fit ​​block 411. The snap-fit ​​block 411 slides horizontally on the end face where the opening of the heat dissipation cavity 101 is located, and the snap-fit ​​block 411 is fixed in the height direction. Under the action of external force, the snap-fit ​​block 411 is inserted into the snap-fit ​​groove 222 or taken out from the snap-fit ​​groove 222.

[0052] This configuration, by fixing the snap-fit ​​block 411 in the height direction, locks the mounting block 221 after it is fully inserted into the snap-fit ​​slot 222 of the mounting block 221 of the heat sink frame 22 under the action of a horizontal external force. This prevents the mounting block 221 (along with the entire heat sink frame 22) from moving in the vertical direction (i.e., away from the heat sink cavity 101), ensuring the long-term stable positioning of the heat sink system and guaranteeing the continuity of the heat sink effect.

[0053] In one embodiment, the disassembly mechanism 4 further includes a mounting base 42 and a handle 43.

[0054] Mounting base 42 is fixedly installed on the end face where the opening of heat dissipation cavity 101 is located. Along the sliding direction of snap-fit ​​block 411, mounting base 42 is located on the side of snap-fit ​​block 411 opposite to mounting block 221. Mounting base 42 is provided with internal threaded hole. Handle 43 is provided with external threaded protrusion 431 and handle 432. External threaded protrusion 431 and internal threaded hole form a threaded transmission pair. The axial direction of external threaded protrusion 431 is parallel to the sliding direction of snap-fit ​​block 411. One end of external threaded protrusion 431 along its axial direction is used to push limit member 41. Handle 432 is installed at the other end of external threaded protrusion 431 along its axial direction.

[0055] The external force rotates the handle 432, driving the external thread protrusion 431 to move along its axial direction, thereby pushing the locking block 411 to move along its sliding direction and adjusting the depth of the locking block 411 inserted into the locking groove 222.

[0056] With this configuration, the rotational motion of the user rotating the handle 432 is converted into the linear motion of the external threaded protrusion 431 along the axial direction by the threaded transmission pair formed by the external threaded protrusion 431 of the handle 43 and the internal threaded hole of the mounting base 42, thereby achieving high-precision displacement control and ensuring that the locking block 411 is smoothly and accurately inserted into the locking groove 222 in the horizontal direction.

[0057] Meanwhile, because the threaded pair has self-locking properties (such as the characteristics of trapezoidal threads or sawtooth threads), it can prevent the snap-fit ​​block 411 from being displaced unexpectedly due to vibration or external force in the non-operating state, ensuring that the position of the heat sink 22 is as expected.

[0058] In one embodiment, the limiting member 41 is further provided with a pressure plate 412, which is installed above the snap-fit ​​block 411; the lower side of the end of the pressure plate 412 near the mounting base 42 is provided with an arc-shaped protrusion 413; the mounting block 221 is provided with an arc-shaped transition surface 224; wherein, when the snap-fit ​​block 411 is inserted into the snap-fit ​​groove 222, the pressure plate 412 is used to abut against the top of the mounting block 221.

[0059] With this configuration, by setting the arc-shaped protrusion 413 and the arc-shaped transition surface 224, during the movement of the snap block 411 toward the snap slot 222, the arc-shaped protrusion 413 on the lower side of the end of the pressure plate 412 will first contact the arc-shaped transition surface 224 on the top of the mounting block 221, providing vertical constraint and preventing the mounting block 221 from accidentally jumping or shaking during subsequent operations, maintaining the stability of the heat sink frame 22 in the horizontal and initial height directions, so that the snap block 411 can find and insert into the snap slot 222 more smoothly and accurately.

[0060] It should be noted that the pressure plate 412 is elastic, such as a spring sheet or rubber pad.

[0061] In one embodiment, the heat dissipation frame 22 has an air inlet and an air outlet; the heat dissipation mechanism 2 also includes a dust filter 23. A pair of dust filters 23 are provided, which are respectively installed at the air inlet and air outlet of the heat dissipation frame 22.

[0062] With this configuration, the dust filter 23 at the air inlet acts as a first line of defense, effectively filtering most of the solid particles in the intake airflow and reducing the risk of pollutants entering the heat dissipation cavity 101 from the mounting cavity. The dust filter 23 at the air outlet acts as another line of defense, directly intercepting dust, particulate matter and other pollutants carried in the external environment, preventing them from entering the heat dissipation cavity 101 of the inverter body 1, and reducing the dust adhering to the surface of the fan blades 21, thus preventing dust from affecting heat dissipation.

[0063] In other words, by setting up two lines of defense, the problem of dust accumulation can be improved, the risk of reduced heat dissipation efficiency and electrostatic adsorption can be reduced, and the service life of the equipment can be extended.

[0064] After prolonged use, rotate the handle 432 to move the external threaded protrusion 431 away from the mounting block 221 and apply external force to the snap-fit ​​block 411 until the snap-fit ​​block 411 is completely disengaged from the snap-fit ​​groove 222. During this process, the pressure plate 412 will disengage from the top of the mounting block 221. At this point, the heat sink 22 can be removed, and the dust filter 23 can be removed from the heat sink 22 for cleaning. The fan 21 can also be maintained.

[0065] After maintenance, align the mounting block 221 with the mounting slot 102 until the mounting block 221 is installed. Then, rotate the handle 432 to move the external threaded protrusion 431 horizontally, which in turn moves the limiting member 41. At this time, the snap-fit ​​block 411 will move towards the snap-fit ​​slot 222. During the movement of the external threaded protrusion 431, the arc-shaped protrusion 413 on the pressure plate 412 will contact the arc-shaped transition surface 224, generating a constraint force acting on the mounting block 221 in the vertical direction.

[0066] In one embodiment, the heat sink 22 has an internal mounting chamber 223; the heat dissipation mechanism 2 also includes a mounting bracket 24. The mounting bracket 24 is mounted inside the mounting chamber 223; the fan 21 is mounted on the mounting bracket 24.

[0067] This configuration provides a robust and stable mounting base for the fan 21 by installing a mounting bracket 24 in the mounting chamber 223 inside the heat sink 22.

[0068] In one embodiment, the heat dissipation mechanism 2 further includes a protective cover 25 for covering the motor of the fan 21.

[0069] This design, by setting up the protective cover 25, provides a physical barrier for the motor of the fan 21, effectively preventing external foreign objects from directly impacting, falling into, or getting entangled on the high-speed rotating motor housing, wiring terminals, or cooling fan 21 blades, thus avoiding serious mechanical failures such as deformation of the motor housing, breakage of the blades, damage to the wiring terminals, or even jamming and stopping.

[0070] At the same time, it can effectively prevent dust and other pollutants from entering the motor, reduce friction loss, and lower the risk of short circuit.

[0071] In one embodiment, the protective cover 25 has an installation area 252 and an empty area 253. The installation area 252 is fixed to the mounting bracket 24 by screws. The protective cover 25 has a ventilation hole 251 located below the empty area 253.

[0072] With this configuration, by mounting the installation area 252 of the protective cover 25 to the mounting bracket 24, the protective cover 25 and the mounting bracket 24 can be connected and fixed. Furthermore, by providing an empty area 253 in the protective cover 25 and placing the air passage 251 below the empty area 253, it is ensured that the introduced cold airflow (from the cooling fan 21) can pass directly and smoothly through the air passage 251 and flow vertically upwards to the area above the empty area 253. This effectively removes the heat generated during motor operation and ensures long-term reliable operation of the motor.

[0073] In one embodiment, the inverter body 1 is further provided with an air inlet 103, which is connected to the mounting cavity.

[0074] With this configuration, since the fan 21 is located inside the heat dissipation cavity 101, a low-pressure area can be generated inside the heat dissipation cavity 101 during the rotation of the fan 21. Since the mounting cavity is connected to the heat dissipation cavity 101, and by adding an air inlet 103 connected to the mounting cavity, external cold air can enter the mounting cavity and form a closed-loop airflow path with the forced exhaust of the fan 21.

[0075] For example, when the frequency converter is running, cold air enters the mounting cavity through the air inlet 103, absorbs the heat generated by the heat-generating components (such as IGBT modules, capacitors, etc.), enters the heat dissipation cavity 101, and is then exhausted.

[0076] It can be noted that the mounting cavity is connected to the heat dissipation cavity 101 through the heat dissipation hole 105.

[0077] Preferably, the heat dissipation hole 105 is in the form of a strip-shaped hole.

[0078] Similarly, multiple heat dissipation holes 105 are provided, and the multiple heat dissipation holes 105 are arranged in an array, such as a rectangular array or a circular array.

[0079] In one embodiment, the inverter body 1 is further provided with a fixing plate 104, and the fixing plate 104 is provided with an oblong hole.

[0080] Preferably, multiple fixing plates 104 are provided, and bolts and nuts are used to fix the inverter body 1 during installation.

[0081] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A heat dissipation assembly for a power frequency converter, characterized in that, include: The inverter body (1) has a heat dissipation cavity (101) and a mounting cavity inside. The mounting cavity is connected to the heat dissipation cavity (101) and is used to mount devices. The heat dissipation mechanism (2) includes a fan (21), which is installed inside the heat dissipation cavity (101); The control mechanism (3) includes a mounting panel (31) and a temperature sensor (32), an intelligent control module (33), and a variable frequency speed control module (34) mounted on the mounting panel (31). The mounting panel (31) is installed in the heat dissipation cavity (101). The detection end of the temperature sensor (32) faces the mounting cavity and is used to detect the temperature of the mounting cavity. The intelligent control module (33) is communicatively connected to the temperature sensor (32) and is used to receive the temperature data detected by the temperature sensor (32) and generate a heat dissipation intensity command suitable for the current temperature. The variable frequency speed control module (34) is communicatively connected to the intelligent control module (33) and is used to receive the heat dissipation intensity command issued by the intelligent control module (33). The variable frequency speed control module (34) is also communicatively connected to the motor of the fan (21).

2. The heat dissipation assembly for a power frequency converter according to claim 1, characterized in that, The heat dissipation cavity (101) is located above the mounting cavity, and the heat dissipation cavity (101) has an opening on the side away from the mounting cavity; The heat dissipation mechanism (2) further includes: The heat dissipation frame (22) is detachably installed at the opening of the heat dissipation cavity (101) via the disassembly mechanism (4).

3. The power inverter heat dissipation assembly according to claim 2, characterized in that, The inverter body (1) has an installation groove (102) on the inner wall of the heat dissipation cavity (101); The heat dissipation frame (22) is provided with a mounting block (221) that is adapted to the mounting slot (102), and the mounting block (221) is provided with a snap-fit ​​slot (222); The disassembly mechanism (4) includes: The limiting member (41) is provided with a snap-fit ​​block (411). The snap-fit ​​block (411) slides horizontally on the end face where the opening of the heat dissipation cavity (101) is located. The snap-fit ​​block (411) is fixed in the height direction. Under the action of external force, the snap-fit ​​block (411) is inserted into the snap-fit ​​groove (222) or taken out from the snap-fit ​​groove (222).

4. The power inverter heat dissipation assembly according to claim 3, characterized in that, The disassembly mechanism (4) further includes: Mounting base (42) is fixedly installed on the end face where the opening of the heat dissipation cavity (101) is located. Along the sliding direction of the snap-fit ​​block (411), the mounting base (42) is located on the side of the snap-fit ​​block (411) away from the mounting block (221). The mounting base (42) is provided with an internal thread hole. The handle (43) is provided with an external threaded protrusion (431) and a handle (432). The external threaded protrusion (431) forms a threaded transmission pair with the internal threaded hole. The axial direction of the external threaded protrusion (431) is parallel to the sliding direction of the snap block (411). One end of the external threaded protrusion (431) along its axial direction is used to push the limiting member (41). The handle (432) is installed at the other end of the external threaded protrusion (431) along its axial direction. The external force rotates the handle (432), driving the external threaded protrusion (431) to move along its axial direction, thereby pushing the locking block (411) to move along its sliding direction.

5. The heat dissipation assembly for a power frequency converter according to claim 4, characterized in that, The limiting member (41) is also provided with a pressure plate (412), which is installed above the snap-fit ​​block (411); The pressure plate (412) has an arc-shaped protrusion (413) on the lower side of the end near the mounting base (42); The mounting block (221) is provided with an arc-shaped transition surface (224); When the snap-fit ​​block (411) is inserted into the snap-fit ​​slot (222), the pressure plate (412) is used to abut against the top of the mounting block (221).

6. The heat dissipation assembly for a power frequency converter according to any one of claims 2-5, characterized in that, The heat dissipation frame (22) is provided with an air inlet and an air outlet; The heat dissipation mechanism (2) also includes: Dust filters (23) are provided in pairs and are respectively installed at the air inlet and air outlet of the heat dissipation frame (22).

7. The heat dissipation assembly for a power frequency converter according to any one of claims 2-5, characterized in that, The heat dissipation frame (22) has an installation chamber (223) inside; The heat dissipation mechanism (2) also includes: Mounting bracket (24) is installed inside the mounting chamber (223); The fan (21) is mounted on the mounting bracket (24).

8. The heat dissipation assembly for a power frequency converter according to any one of claims 2-5, characterized in that, The heat dissipation mechanism (2) also includes: A protective cover (25) is used to cover the motor of the fan (21).

9. The heat dissipation assembly for a power frequency converter according to claim 8, characterized in that, The protective cover (25) is provided with an installation area (252) and an empty area (253), and the installation area (252) is installed on the mounting frame (24); The protective cover (25) has a ventilation hole (251) located below the vacant area (253).

10. The heat dissipation assembly for a power frequency converter according to any one of claims 2-5, characterized in that, The inverter body (1) is also provided with an air inlet (103), which is connected to the mounting cavity.

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