Dustproof ventilation device of low-voltage frequency conversion cabinet

Abstract

The utility model provides a dustproof ventilation device for a low-voltage frequency conversion cabinet, and belongs to the technical field of low-voltage power distribution. The lower part of one side of the cabinet body is provided with an air inlet window, and the upper part of one side of the cabinet body is provided with an air outlet window; an air outlet box is mounted on the outer side of the air outlet window; a suction fan and a dustproof net are arranged in the air outlet box; a plurality of ventilation grooves are formed in the outer side wall of the air inlet box, first filter screens are installed on the inner sides of the ventilation grooves, and a second filter screen is installed in the middle of the air inlet box; a cleaning mechanism is arranged between the first filter screen and the second filter screen; a moisture-proof mechanism is arranged in the air inlet box close to the air inlet window and comprises a moisture-proof frame body installed in the air inlet box, the outer wall of the moisture-proof frame body is connected with the inner wall of the air inlet box in a sealed mode, and a plurality of activated carbon adsorption plates are arranged in the moisture-proof frame body. The device has the multiple effects of dust prevention, moisture prevention, ventilation and cooling, the filter screen can be automatically and regularly cleaned, the filter screen is not prone to being blocked, and the frequency and difficulty of cleaning work are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage power distribution, in particular to a dust-proof ventilation device for a low-voltage frequency conversion cabinet. Background Art

[0002] A frequency converter cabinet is a control cabinet that uses a frequency converter to drive a power unit. The electrical components within the cabinet generate heat during operation. Low-voltage frequency converters also require internal heat dissipation during operation. Due to the unique operating environments of some low-voltage frequency converters (such as paint shops), relying solely on the strong convection created by fans is insufficient to effectively dissipate the heat required for the cabinet and its components. Existing low-voltage frequency converter cabinet designs typically incorporate air intake windows and shutters on the top or sides of the cabinet to achieve ventilation and heat dissipation. However, these shutters offer a low dust protection rating. When the low-voltage frequency converter is located in a dusty environment, dust can easily be drawn in and deposited on the surfaces of the electrical components. Insects, such as mosquitoes, can also easily enter the cabinet, causing electrical malfunctions and potentially posing numerous safety risks. If a filter is used instead of a louver during intake, the filter will filter the air entering the cabinet. While this improves the cabinet's dust protection, dust and foreign matter will gradually adhere to the filter's outer surface over time. Because the filter lacks moisture resistance, impurities can easily clog the filter's mesh, reducing its air permeability and even causing air intake blockage. This affects ventilation and heat dissipation, hindering heat dissipation within the inverter cabinet. Consequently, the filter must be regularly cleaned of accumulated impurities, requiring frequent cleaning and even requiring the filter to be removed and replaced. However, to prevent the filter from falling during use, the filter is often securely fastened to the intake louver, making it difficult to remove and install, making it difficult to disassemble and clean. This reduces the filter's ease of use and increases the difficulty of cleaning. Therefore, the dust control and ventilation systems of low-voltage inverter cabinets continue to require research and improvement to achieve better performance. Utility Model Content

[0003] The utility model provides a dust-proof ventilation device for a low-voltage frequency conversion cabinet, which is used to solve the problems of poor heat dissipation and ventilation effect inside the existing frequency conversion cabinet, poor use effect of shutters, inability to prevent moisture and easy clogging of the filter screen, inconvenience in disassembly and cleaning, resulting in high cleaning frequency and great difficulty in cleaning.

[0004] The utility model provides a dust-proof ventilation device for a low-voltage frequency conversion cabinet, comprising: a cabinet body of a low-voltage frequency conversion cabinet; an air inlet window is provided at the lower part of one side of the cabinet body, and an air outlet window is provided at the upper part of the cabinet body on one side away from the air inlet window; an air outlet box is installed on the outer side of the air outlet window, a suction fan is provided in the air outlet box, and a dust-proof net is installed on the side of the air outlet box opposite to the air outlet window; an air inlet box is installed on the outer side of the air inlet window, a plurality of horizontal ventilation slots are provided on the side wall of the air inlet box opposite to the air inlet window, a first filter screen is detachably installed on the inner side of the ventilation slot, and a second filter screen is detachably installed in the middle of the air inlet box; a cleaning mechanism is also provided between the first filter screen and the second filter screen; a moisture-proof mechanism is also provided in the air inlet box near the air inlet window, the moisture-proof mechanism comprises a moisture-proof frame, the moisture-proof frame is detachably installed inside the air inlet box, and the outer wall of the moisture-proof frame is sealed with the inner wall of the air inlet box, and a plurality of activated carbon adsorption plates are provided in the moisture-proof frame.

[0005] Preferably, the number of the activated carbon adsorption plates is at least three, and the activated carbon adsorption plates are symmetrically staggered in the upper and lower directions.

[0006] Preferably, a dust shield is correspondingly provided on the outer side of each ventilation slot, each dust shield is arranged to be tilted downward, and is fixedly installed above the ventilation slot.

[0007] Preferably, the cleaning mechanism includes a motor, a reciprocating screw, a guide rod, a fixed plate and a cleaning brush; the motor is installed at the bottom of the air inlet box, the output shaft of the motor is connected to the reciprocating screw that is rotatably connected to the inside of the air inlet box, the guide rod is fixed inside the air inlet box, and the guide rod and the reciprocating screw are arranged parallel in the vertical direction; a horizontal fixed plate is provided on the reciprocating screw and the guide rod, and cleaning brushes are provided at both ends of the fixed plate, and the bristles of the cleaning brushes at both ends are respectively in contact with the first filter and the second filter.

[0008] Preferably, a dust suction port is provided at the bottom of the air inlet box, and the dust suction port is located below the cleaning mechanism; the dust suction port is connected to the inlet of a vacuum cleaner arranged below the air inlet box.

[0009] Preferably, the air inlet box is also provided with a dust-proof mechanism, which includes an electric push rod, a partition and a connecting rod. The electric push rod is arranged on the outside of the side wall of the air inlet box, and the top of the output end of the electric push rod is connected to a horizontally arranged connecting rod. The bottom of the connecting rod is fixed to the top of the partition, and the partition is slidably connected to a sliding groove opened on the top of the air inlet box. The sliding groove is opened at the top of the air inlet box between the second filter screen and the moisture-proof frame, and the partition can completely separate the second filter screen from the moisture-proof frame.

[0010] Preferably, the suction fan, the motor, the dust collector and the electric push rod are all electrically connected to the controller.

[0011] Preferably, the air inlet box and the air outlet box are both provided with an inspection door on a side wall adjacent to the cabinet body.

[0012] The utility model provides a dust-proof ventilation device for a low-voltage frequency conversion cabinet, which, through the cooperation of an air inlet box and an air outlet box, sucks out the high-temperature gas in the cabinet body of the low-voltage frequency conversion cabinet, and sends in fresh low-temperature air from the outside that has been filtered, dust-removed, and dehumidified, so as to ventilate and cool the electrical components inside the cabinet body, has a significant cooling and heat dissipation effect, and can prevent electrical failures caused by impurities such as dust, moisture, and high temperature.

[0013] The cleaning mechanism in this device regularly cleans the filter, achieving regular and automatic cleaning of the filter, ensuring air permeability and cleanliness, preventing dust accumulation and reduced ventilation efficiency, and reducing the frequency and difficulty of cleaning. The moisture-proof mechanism removes moisture and improves air dryness, allowing the low-voltage frequency converter cabinet to operate reliably in special environments or weather conditions. It has a wide range of applications, helps prevent moisture from affecting electrical components in the cabinet, extends the service life of the low-voltage frequency converter cabinet, and reduces maintenance costs.

[0014] The vacuum cleaner used in conjunction with the cleaning mechanism in the device can centrally suck the impurities cleaned off the filter screen when the cleaning mechanism is working. At the same time, the dust-proof mechanism is used to completely isolate the second filter screen and the moisture-proof frame, preventing dust and the like from entering the moisture-proof mechanism and the cabinet when the cleaning mechanism is working, thereby improving the cleaning efficiency and dust-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of a dust-proof ventilation device for a low-voltage frequency conversion cabinet provided in one embodiment of the present utility model;

[0017] Figure 2 A schematic structural diagram of a cleaning mechanism provided in one embodiment of the present invention;

[0018] Figure 3 This is a schematic structural diagram of a dust prevention mechanism provided in one embodiment of the present invention.

[0019] Description of reference numerals:

[0020] 1-cabinet, 2-air outlet box, 3-air inlet box, 4-vacuum cleaner, 21-suction fan, 22-dustproof net, 31-ventilation slot, 32-first filter, 33-second filter, 34-moisture-proof frame, 35-activated carbon adsorption plate, 36-ash baffle, 37-ash suction port, 381-motor, 382-reciprocating screw, 383-guide rod, 384-fixed plate, 385-cleaning brush, 391-electric push rod, 392-partition, 393-connecting rod. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.

[0022] like Figure 1 The utility model provides a dust-proof ventilation device for a low-voltage frequency conversion cabinet, comprising: a cabinet body 1 of a low-voltage frequency conversion cabinet; an air inlet window is provided at the lower part of one side of the cabinet body 1, and an air outlet window is provided at the upper part of the side of the cabinet body 1 away from the air inlet window; an air outlet box 2 is installed on the outer side of the air outlet window, a suction fan 21 is provided in the air outlet box 2, and a dustproof net 22 is installed on the side of the air outlet box 2 opposite to the air outlet window.

[0023] The suction fan 21 in the air outlet box 2 is used to suck out the high-temperature air from the cabinet 1 of the low-voltage inverter cabinet, discharge it through the air outlet window and the air outlet box 2, and create positive pressure blowing at the dust screen 22. The dust screen 22 is installed on the outermost side of the air outlet box 2. Its main function is to prevent dust, leaves and other impurities near the air outlet box 2 from entering the air outlet box 2 and affecting the normal operation of the suction fan 21.

[0024] Preferably, an air inlet box 3 is installed on the outside of the air inlet window, and a plurality of horizontal ventilation slots 31 are provided on the side wall of the air inlet box 3 opposite to the air inlet window. A first filter 32 is detachably installed on the inner side of the ventilation slot 31, and a second filter 33 is detachably installed in the middle of the air inlet box 3; a cleaning mechanism is also provided between the first filter 32 and the second filter 33.

[0025] The outermost side of the air inlet box 3 is provided with a ventilation slot 31 for facilitating the entry of outside air into the air inlet box 3 and the cabinet 1. After the air enters the air inlet box 3, it is filtered in sequence by the first filter 32 and the second filter 33 to remove dust particles, mosquitoes, etc. carried in the air to ensure the cleanliness of the interior of the cabinet 1. At the same time, the low-temperature air from the outside is used to ventilate and cool the electrical components inside the cabinet 1 to prevent electrical failures caused by dust and high temperature. The mesh diameters of the first filter 32 and the second filter 33 can be the same or different. Preferably, the mesh diameter of the first filter 32 is larger than the mesh diameter of the second filter 33. The cleaning mechanism provided between the first filter 32 and the second filter 33 can regularly clean the filters to ensure the air permeability and cleanliness of the filters and to prevent dust accumulation thereon and causing a decrease in ventilation effect.

[0026] Preferably, a moisture-proof mechanism is also provided in the air inlet box 3 near the air inlet window, and the moisture-proof mechanism includes a moisture-proof frame 34. The moisture-proof frame 34 is detachably installed inside the air inlet box 3, and the outer wall of the moisture-proof frame 34 is sealed to the inner wall of the air inlet box 3. A plurality of activated carbon adsorption plates 35 are provided in the moisture-proof frame 34.

[0027] The main function of the moisture-proof mechanism in the air inlet box 3 is to prevent moisture and remove water. The low-voltage frequency conversion cabinet may be set up in a special environment (such as an area with abundant rain) or operate in special weather (such as rainy or snowy days). Moisture will also affect the normal operation of the electrical components in the cabinet 1. Therefore, while ventilating, the adsorption performance of the activated carbon adsorption plate 35 is used to adsorb and purify the moisture in the air, thereby improving the dryness of the air, which is beneficial to prevent the electrical components in the cabinet 1 from getting damp and prolonging the service life of the low-voltage frequency conversion cabinet. The air inlet box 3 is provided with an installation slot for facilitating the installation of the filter screen and the moisture-proof frame 34, which is a conventional setting in this field. The installation slot is adapted to the filter screen and the moisture-proof frame 34 respectively and can be connected and installed by screws, snaps, etc.

[0028] Preferably, there are at least three activated carbon adsorption plates 35, and the activated carbon adsorption plates 35 are symmetrically staggered in the vertical direction. The activated carbon adsorption plates 35 not only absorb dust and other particles in the air, but also absorb moisture in the air, thereby preventing excessive humidity inside the cabinet 1. The staggered arrangement of the activated carbon adsorption plates 35 in the vertical direction can extend the air flow path and change its flow direction, thereby improving the moisture removal and moisture-proof dehumidification effects.

[0029] Preferably, a dust shield 36 is provided on the outside of each ventilation slot 31. Each dust shield 36 is tilted downward and fixedly mounted above the ventilation slot 31. The downward-tilted dust shields 36 installed on the outside of the ventilation slot 31 prevent large particles of impurities from entering the air inlet box 3. They also prevent rainwater and other substances from entering the air inlet box 3 and causing electrical malfunctions in the low-voltage frequency converter cabinet.

[0030] like Figure 2 Preferably, the cleaning mechanism includes a motor 381, a reciprocating screw 382, a guide rod 383, a fixed plate 384 and a cleaning brush 385; the motor 381 is installed at the bottom of the air inlet box 3, and the output shaft of the motor 381 is connected to the reciprocating screw 382 which is rotatably connected to the inside of the air inlet box 3, the guide rod 383 is fixed to the inside of the air inlet box 3, and the guide rod 383 is arranged parallel to the reciprocating screw 382 in the vertical direction; a horizontal fixed plate 384 is provided on the reciprocating screw 382 and the guide rod 383, and cleaning brushes 385 are provided at both ends of the fixed plate 384, and the bristles of the cleaning brushes 385 at both ends are respectively in contact with the first filter 32 and the second filter 33.

[0031] Motor 381 provides power, causing fixed plate 384 to move up and down along the direction guided by reciprocating screw 382 and guide rod 383. Cleaning brush 385 also moves up and down with fixed plate 384. During this movement, the bristles of cleaning brush 385 clean impurities accumulated on the surface and mesh of first filter 32 and second filter 33, thereby restoring and ensuring the ventilation and air permeability of the filters. The use of a motorized cleaning mechanism enables regular automatic cleaning of the filters, improving filter cleaning efficiency, reducing the frequency and difficulty of manual work, and also helping to extend the service life of the filters.

[0032] like Figure 1 Preferably, a dust suction port 37 is provided at the bottom of the air inlet box 3 and is located below the cleaning mechanism. The dust suction port 37 is connected to the inlet of a vacuum cleaner 4 disposed below the air inlet box 3. To ensure the cleanliness of the interior of the air inlet box 3, when the filter is cleaned by the cleaning mechanism, the vacuum cleaner 4 connected to the dust suction port 37 sucks the impurities removed from the filter out of the air inlet box 3, thereby preventing them from accumulating in the air inlet box 3 and improving the cleaning effect.

[0033] like Figure 3 Preferably, the air inlet box 3 is also provided with a dust-proof mechanism, which includes an electric push rod 391, a partition 392 and a connecting rod 393. The electric push rod 391 is arranged on the outside of the side wall of the air inlet box 3, and the top of the output end of the electric push rod 391 is connected to a horizontally arranged connecting rod 393. The bottom of the connecting rod 393 is fixed to the top of the partition 392. The partition 392 is slidably connected to a sliding groove opened at the top of the air inlet box 3. The sliding groove is opened at the top of the air inlet box 3 between the second filter 33 and the moisture-proof frame 34, and the partition 392 can completely separate the second filter 33 from the moisture-proof frame 34.

[0034] In order to improve the dust-proof effect when the cleaning mechanism is working, the electric push rod 391 is used to drive the connecting rod 393 and the partition 392 to move downward, and the second filter 33 and the moisture-proof frame 34 are completely isolated. At this time, the impurities cleaned by the cleaning brush 385 will not enter the moisture-proof frame 34. By utilizing this isolation effect, dust and the like are prevented from entering the moisture-proof mechanism and the cabinet 1 when the cleaning mechanism is working, thereby improving the cleaning efficiency and dust-proof effect. After the cleaning work is completed, the output end of the electric push rod 391 is pushed upward, and the partition 392 is pulled upward to restore the connectivity of the air inlet box 3. The area of the partition 392 should be larger than the cross-sectional area of the air inlet box 3, and the partition 392 and the sliding groove should be connected by a sliding sealing structure commonly used in the field, such as a sliding sealing strip.

[0035] Preferably, the suction fan 21, motor 381, vacuum cleaner 4, and electric push rod 391 are all electrically connected to a controller (conventional setup, not shown in the drawings). The controller allows for better control of the operating states of the suction fan 21, motor 381, vacuum cleaner 4, and electric push rod 391. This also facilitates simultaneous activation or deactivation of the suction fan 21, cleaning mechanism, dust prevention mechanism, and vacuum cleaner 4 at the start or end of a cleaning operation, thereby improving coordination and efficiency.

[0036] Preferably, both the air inlet box 3 and the air outlet box 2 are provided with an inspection door on a side wall adjacent to the cabinet body 1 (conventional arrangement, not shown in the drawings). The inspection door on the air inlet box 3 facilitates the removal, replacement, and installation of the filter, moisture-proof mechanism, etc., while the inspection door on the air outlet box 2 facilitates the inspection of the dust screen 22 and the suction fan 21, thereby improving ease of use.

[0037] The dust-proof ventilation device for a low-voltage frequency conversion cabinet provided by the present invention operates by turning on the suction fan 21 in the air outlet box 2, and using the suction fan 21 to suck out the high-temperature gas in the cabinet 1, which is then discharged through the air outlet window and the air outlet box 2, and forming a positive pressure blower at the dustproof net 22. At the same time, fresh air from the outside is filtered once by the dust shield 36, enters the air inlet box 3 from the ventilation slot 31, is blocked by the first filter 32 and undergoes a second filtration, then passes through the second filter 33 for a third filtration, and then enters the moisture-proof frame 34, where the activated carbon adsorption plate 35 therein absorbs the moisture carried therein, and finally enters the cabinet 1 through the air inlet window, cools the electrical components and dissipates heat, and is then discharged from the cabinet 1 through the air outlet box 2.

[0038] After the device has been running for a period of time, the filter needs to be automatically cleaned. At this time, the controller controls the suction fan 21 to temporarily shut down and simultaneously starts the motor 381, the vacuum cleaner 4, and the electric push rod 391. The electric push rod 391 drives the connecting rod 393 and the partition 392 to move downward, completely isolating the second filter 33 from the moisture-proof frame 34. The motor 381 then drives the reciprocating screw 382 to rotate, causing the fixed plate 384 to move up and down along the direction guided by the reciprocating screw 382 and the guide rod 383. The cleaning brush 385 also moves up and down with the fixed plate 384. During the movement, the bristles of the cleaning brush 385 can clean the impurities accumulated on the surface and mesh of the first filter 32 and the second filter 33. The vacuum cleaner 4 then sucks the impurities cleaned from the filter out of the air inlet box 3 through the dust suction port 37 to prevent them from accumulating in the air inlet box 3, thereby improving the cleaning effect. After cleaning is completed, the output end of the electric push rod 391 is pushed upward, and the partition 392 is pulled out upward to restore the connectivity of the air inlet box 3. At the same time, the motor 381 and the vacuum cleaner 4 are turned off, and the suction fan 21 is turned on to restore the flow of the air inlet box 3 and the air outlet box 2, and continue to ventilate and dissipate heat to the cabinet 1 and its interior.

[0039] It should be noted that the specific models and specifications of the controller, electric push rod 391, vacuum cleaner 4, and motor 381 must be selected based on the actual specifications of the device. The specific selection and calculation methods use existing technologies in the field and will not be described in detail here. The power supply and connection principles of the controller, electric push rod 391, vacuum cleaner 4, and motor 381 are clear to those skilled in the art and will not be described in detail here.

[0040] It should be noted that the detailed structure of some devices is not described in detail in this utility model, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not described in this device are the same as the prior art or can be implemented by using the prior art.

[0041] It should be noted that temperature sensors are installed on the conveying pipelines inside the device between different units and equipment. Different valves are also installed, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire device.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dustproof ventilation device for a low-voltage frequency conversion cabinet, characterized in that: include: A cabinet body of a low-voltage frequency conversion cabinet; an air inlet window is provided at a lower portion of one side of the cabinet body, and an air outlet window is provided at an upper portion of a side of the cabinet body away from the air inlet window; an air outlet box is installed outside the air outlet window, a suction fan is provided in the air outlet box, and a dust screen is installed on the side of the air outlet box opposite to the air outlet window; An air inlet box is installed on the outer side of the air inlet window, and a plurality of horizontal ventilation slots are opened on a side wall of the air inlet box opposite to the air inlet window. A first filter is detachably installed on the inner side of the ventilation slot, and a second filter is detachably installed in the middle of the air inlet box; a cleaning mechanism is also provided between the first filter and the second filter. A moisture-proof mechanism is also provided in the air inlet box near the air inlet window, and the moisture-proof mechanism includes a moisture-proof frame. The moisture-proof frame is detachably installed inside the air inlet box, and the outer wall of the moisture-proof frame is sealed with the inner wall of the air inlet box. A plurality of activated carbon adsorption plates are provided in the moisture-proof frame.

2. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 1, characterized in that: The number of the activated carbon adsorption plates is at least three, and the activated carbon adsorption plates are symmetrically staggered in the upper and lower directions.

3. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 1, characterized in that: A dust shield is correspondingly provided on the outer side of each ventilation slot, each dust shield is arranged to be tilted downward, and the dust shield is fixedly installed above the ventilation slot.

4. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 1, characterized in that: The cleaning mechanism includes a motor, a reciprocating screw, a guide rod, a fixed plate and a cleaning brush; the motor is installed at the bottom of the air inlet box, the output shaft of the motor is connected to the reciprocating screw that is rotatably connected to the inside of the air inlet box, the guide rod is fixed to the inside of the air inlet box, and the guide rod and the reciprocating screw are arranged parallel in the vertical direction; the reciprocating screw and the guide rod are provided with a horizontal fixed plate, and the cleaning brushes are provided at both ends of the fixed plate, and the bristles of the cleaning brushes at both ends are respectively in contact with the first filter and the second filter.

5. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 4, characterized in that: A dust suction port is provided at the bottom of the air inlet box, and the dust suction port is located below the cleaning mechanism; the dust suction port is connected to the inlet of a vacuum cleaner arranged below the air inlet box.

6. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 5, characterized in that: The air inlet box is also provided with a dust-proof mechanism, which includes an electric push rod, a partition and a connecting rod. The electric push rod is arranged on the outside of the side wall of the air inlet box, and the top of the output end of the electric push rod is connected to the horizontally arranged connecting rod. The bottom of the connecting rod is fixed to the top of the partition, and the partition is slidably connected to the sliding groove opened on the top of the air inlet box. The sliding groove is opened at the top of the air inlet box between the second filter screen and the moisture-proof frame, and the partition can completely isolate the second filter screen from the moisture-proof frame.

7. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to claim 6, characterized in that: The suction fan, the motor, the dust collector and the electric push rod are all electrically connected to the controller.

8. The dust-proof ventilation device for a low-voltage frequency conversion cabinet according to any one of claims 1 to 7, characterized in that: The air inlet box and the air outlet box are both provided with an inspection door on a side wall adjacent to the cabinet body.

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