Explosion-proof high-voltage frequency converter

Abstract

The application discloses an explosion-proof high-voltage frequency conversion speed regulator and belongs to the technical field of high-voltage frequency conversion speed regulators. The explosion-proof high-voltage frequency conversion speed regulator comprises a box body, an air inlet fan is arranged at the lower end of the box body, heat dissipation holes are uniformly arranged on the two sides of the box body, an adjusting air cylinder is arranged on the inner side of the box body and is attached to the inner wall of the heat dissipation hole, air holes are symmetrically arranged on the adjusting air cylinder, a first electric push rod is fixedly arranged on the inner side of the box body, a pressing plate is fixedly arranged on the output end of the first electric push rod, an elevating plate is elastically arranged below the pressing plate, a transmission assembly is connected between the elevating plate and the shaft part of the uppermost adjusting air cylinder, and the adjusting air cylinder is driven to rotate through the transmission assembly during the descending process of the elevating plate. The explosion-proof high-voltage frequency conversion speed regulator can conveniently control the heat dissipation structure, is automatically closed in a non-working state and a fault state, can efficiently extinguish fire when a fire occurs due to a fault and is high in explosion-proof safety.

Description

Technical Field

[0001] This invention relates to the field of high-voltage variable frequency speed controller technology, specifically an explosion-proof high-voltage variable frequency speed controller. Background Technology

[0002] In industries such as power, metallurgy, chemical, cement, and mining, high-power high-voltage motors such as high-pressure fans, water pumps, compressors, and mills are widely used. These devices are mostly in continuous operation and in most cases do not require long-term full-load operation. The operation and control method of the motor directly determines the energy consumption, operational stability, and service life of the equipment. It is also a core link in energy conservation, consumption reduction, and safe production in industrial production. Therefore, high-voltage variable frequency drives are required.

[0003] The prior art (Chinese patent publication number: CN108616235A, publication date: 2018-10-02) discloses an explosion-proof high-voltage variable frequency drive, including a variable frequency drive housing. A control board is mounted on the surface of the housing, and control buttons are mounted on its surface. Support legs are located at the four corners of the bottom of the housing. A swing door is located on the lower side of the control board and on the surface of the housing, with a concave handle at its edge. First sliding strips on both sides of the cooling fan engage with and are fixed to first sliding grooves, facilitating disassembly, maintenance, and replacement of the cooling fan, thus improving worker efficiency. Second sliding strips on both sides of the dust filter plate engage with and are fixed to second sliding grooves, facilitating disassembly and cleaning of the dust filter plate. This ensures a continuous flow of cool air into the heat dissipation holes, preventing blockage and thus extending the service life of the variable frequency drive. Existing technology (Chinese patent publication number: CN220629212U, publication date: 2024-03-19) discloses an explosion-proof high-voltage variable frequency speed controller, including a housing, in which the variable frequency speed controller body is placed. A rotating door is rotatably provided at the right end of the housing, and a display is embedded in the rotating door. A knob is provided behind the display. A sliding cavity is opened on the rotating door, and a toothed plate is slidably connected to the sliding cavity. A spring is fixedly connected between the toothed plate and the sliding cavity. An insert is fixedly connected to the rear end of the toothed plate. A slot corresponding to the position of the insert is opened on the rear wall of the housing. By opening a heat dissipation vent and installing a cooling fan on the housing, the heat generated by the variable frequency speed controller during operation can be dissipated from the housing in a timely manner. By operating the pressing rod, the insert can be disengaged from the slot through the meshing of the gear and the toothed plate, and the housing can be used to limit the rotation door, making it easy to open the housing and facilitate the maintenance and repair of the variable frequency speed controller. The operation is simple and convenient.

[0004] The existing high-voltage variable frequency drive has a simple heat dissipation structure, which cannot be easily controlled. It cannot automatically seal off the air in non-working or fault conditions, making the equipment prone to failure due to moisture and dust in the air. In addition, it cannot quickly extinguish fires caused by faults, and its explosion-proof safety is limited. Summary of the Invention

[0005] The purpose of this invention is to provide an explosion-proof high-voltage variable frequency speed controller to solve the problems mentioned in the background art. The current high-voltage variable frequency speed controllers on the market have a simple heat dissipation structure, which makes them difficult to control. They cannot automatically seal off the air in non-working or fault conditions, making the equipment prone to failure due to moisture, dust, etc. in the air. Furthermore, they cannot quickly extinguish fires caused by faults.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an explosion-proof high-voltage variable frequency speed controller, comprising a housing, an intake fan installed at the lower end of the housing, and heat dissipation holes evenly distributed on both sides of the housing; an adjusting air cylinder installed inside the housing, the adjusting air cylinder fitting against the inner wall of the heat dissipation holes, and symmetrical air holes distributed on the adjusting air cylinder; a first electric push rod fixedly installed inside the housing, and a pressure plate fixedly installed at the output end of the first electric push rod; a lifting plate elastically lifting and loweringly installed below the pressure plate; a transmission assembly connecting the lifting plate and the shaft of the uppermost adjusting air cylinder; and during the downward movement of the lifting plate, the adjusting air cylinder is driven to rotate through the transmission assembly, simultaneously... The shafts of adjacent regulating air cylinders on one side are connected by a synchronous belt drive. An air intake sealing assembly is provided on the inner side of the lower end of the housing. When the regulating air cylinder rotates, it drives the air intake sealing assembly to block the air intake fan duct. A liquid storage tank is fixedly installed inside the upper end of the housing. The liquid storage tank is filled with liquid reactant and a liquid propulsion assembly is provided on the liquid storage tank. A reaction tube is coaxially fixedly installed on the inner side of the regulating air cylinder. The inner side of the reaction tube is filled with fixed reactant. When a fire occurs, the liquid propulsion assembly pushes the liquid reactant in the storage tank to each reaction tube. At the same time, the carbon dioxide produced by the reaction between the liquid reactant and the fixed reactant enters the inner side of the housing through the air vent to extinguish the fire.

[0007] Preferably, the transmission assembly includes racks symmetrically fixedly installed below the lifting plate, and a gear is fixedly installed on the shaft of the uppermost adjusting air cylinder, with the rack and gear meshing together, while the adjusting air cylinder is driven to rotate during the downward movement of the lifting plate.

[0008] Preferably, the housing is connected to the external space through heat dissipation holes and air holes on the regulating air cylinder, and the heat dissipation holes and air holes are staggered after the regulating air cylinder is rotated.

[0009] Preferably, the air intake blocking assembly includes a lever fixedly installed on the outside of the lowest adjusting air cylinder, and the lever is made of elastic material. The lower inner side of the housing is connected to a connecting plate by a spring in a symmetrical elastic lifting manner, and a blocking plate is fixedly connected between the two connecting plates. During the rotation of the adjusting air cylinder, the connecting plate and the blocking plate are pushed down, and the blocking plate blocks the air duct of the air intake fan during the downward movement of the blocking plate.

[0010] Preferably, the liquid actuation assembly includes a second electric actuator fixedly installed below the liquid storage tank, and the output end of the second electric actuator passes through the lower end of the liquid storage tank and is fixedly connected to a sealing slider, and the sealing slider is slidably installed inside the liquid storage tank, and the upper end of the liquid storage tank is fixedly connected to an injection pipe.

[0011] Preferably, the reaction tube and the injection tube are sealed and rotatably connected, and the reaction tubes on adjacent regulating gas cylinders are connected in series through liquid guide tubes. An exhaust pipe is connected to the reaction tube, and a one-way valve is provided on the exhaust pipe. The position of the exhaust pipe is higher than the liquid surface of the liquid reactant entering the inside of the reaction tube, and the gas generated by the reaction enters the inside of the box through the exhaust pipe and the air hole.

[0012] Preferably, heat exchange fins are evenly arranged on the outer side of the reaction tube, and hot air flows to the heat exchange fins through the air holes during the heat dissipation process of the box, and filter screens are fixedly installed at both ends of the reaction tube.

[0013] Preferably, the top of the housing is provided with a pressure relief hole, and a pressure plug is installed inside the pressure relief hole by means of a spring elastic lifting mechanism, and the pressure plug is arranged in the shape of an inverted frustum.

[0014] Preferably, a pull rope is fixedly connected to the lower end of the pressure plug, and a follower plate is fixedly installed above the lifting plate. The lower ends of the follower plate and the pull rope are fixedly connected. When the follower plate moves down with the lifting plate, it tightens the pull rope. When the pressure plug is depressurized and moves up, the pull rope pulls the follower plate and the lifting plate up slightly.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the explosion-proof high-voltage variable frequency speed controller can conveniently adjust the heat dissipation structure, automatically close in non-operating and fault states, and can efficiently extinguish fires when a fault causes a fire. It has high explosion-proof safety. The specific details are as follows. 1. Equipped with regulating air cylinders, when the high-voltage frequency converter is working normally, the heat dissipation holes and the air holes on the regulating air cylinders are connected to achieve normal ventilation and heat dissipation. When the equipment is shut down or a malfunction occurs, the first electric push rod is controlled to push the lifting plate down, causing the rack and gear to mesh, which in turn drives multiple regulating air cylinders to rotate synchronously, so that the heat dissipation holes and air holes are staggered, thus blocking the heat dissipation holes. At the same time, the regulating air cylinder at the bottom pushes the connecting plate and the sealing plate to move down elastically through the lever, so that the sealing plate blocks the air duct of the intake fan, thereby achieving the sealing of the entire enclosure and preventing outside air from entering.

[0016] 2. Equipped with an adjusting air cylinder and reaction tubes, when the adjusting air cylinder rotates, its air holes are only connected to the inside of the box. When a fire is detected, the second electric push rod is controlled to push the sealing slider to move in the liquid storage tank, so that the liquid reactant in the liquid storage tank enters each reaction tube through the injection pipe and the guide pipe, thereby reacting with the solid reactant in the reaction tube to produce a large amount of carbon dioxide, which enters the inside of the box through the exhaust pipe and air holes to achieve auxiliary fire extinguishing.

[0017] 3. Equipped with a pressure plug, follower plate, and pull rope, as the air pressure inside the chamber continuously increases, the pressure plug can elastically rise under the action of air pressure to release pressure and exhaust air. At the same time, the pressure plug will pull the follower plate and lifting plate slightly upward through the pull rope, which will cause the rack and gear to re-engage slightly, driving the regulating air cylinder to rotate slightly, ensuring that the air hole is always inside the chamber, thereby shaking and mixing the reagent inside the reaction tube, promoting the reaction and ensuring sufficient air supply. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic cross-sectional view of the box structure of the present invention; Figure 3 This is a schematic diagram of the adjustable air cylinder installation structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the connection structure between the air cylinder and the gear in this invention; Figure 6 This is a schematic diagram of the sealing plate installation structure of the present invention; Figure 7 This is a schematic cross-sectional view of the liquid storage tank of the present invention; Figure 8 This is a schematic cross-sectional view of the adjustable air cylinder structure of the present invention.

[0019] In the diagram: 1. Housing; 2. Intake fan; 3. Heat dissipation hole; 4. Adjustable air cylinder; 5. Air vent; 6. First electric push rod; 7. Pressure plate; 8. Lifting plate; 9. Rack; 10. Gear; 11. Paddle; 12. Connecting plate; 13. Sealing plate; 14. Liquid storage tank; 15. Second electric push rod; 16. Sealing slider; 17. Liquid injection pipe; 18. Reaction pipe; 1801. Heat exchange fins; 1802. Filter screen; 1803. Exhaust pipe; 19. Liquid guide pipe; 20. Pressure plug; 21. Follower plate; 22. Pull rope. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Existing high-voltage variable frequency drives (VFDs) are inconvenient to adjust and seal the heat dissipation mechanism in non-operating and fault states, allowing outside air to enter and affecting safe operation. To solve this technical problem, this example discloses the following technical content. Please refer to [link / reference]. Figures 1-5 As shown; an explosion-proof high-voltage variable frequency speed controller includes a housing 1, an intake fan 2 installed at the lower end of the housing 1, and heat dissipation holes 3 evenly distributed on both sides of the housing 1. An adjusting air cylinder 4 is installed inside the housing 1 and fits against the inner wall of the heat dissipation holes 3. Air holes 5 are symmetrically distributed on the adjusting air cylinder 4. A first electric push rod 6 is fixedly installed inside the housing 1, and a pressure plate 7 is fixedly installed at the output end of the first electric push rod 6. A lifting plate 8 is elastically lifted and lowered below the pressure plate 7. A transmission assembly is connected between the lifting plate 8 and the shaft of the uppermost adjusting air cylinder 4. During the downward movement of the lifting plate 8, the adjusting air cylinder 4 is driven to rotate through the transmission assembly. At the same time, the shafts of adjacent adjusting air cylinders 4 on the same side are connected by synchronous belt transmission. An intake sealing assembly is provided inside the lower end of the housing 1. When the adjusting air cylinder 4 rotates, the intake sealing assembly is driven to block the air duct of the intake fan 2.

[0022] The transmission assembly includes a rack 9 symmetrically fixedly installed below the lifting plate 8, and a gear 10 fixedly installed on the shaft of the uppermost regulating air cylinder 4, with the rack 9 and gear 10 meshing together. During the downward movement of the lifting plate 8, the regulating air cylinder 4 is driven to rotate. The housing 1 is connected to the external space through the heat dissipation hole 3 and the air hole 5 on the regulating air cylinder 4. After the regulating air cylinder 4 rotates, the heat dissipation hole 3 and the air hole 5 are staggered. The air intake sealing assembly includes a lever 11 fixedly installed on the outside of the lowermost regulating air cylinder 4, and the lever 11 is made of elastic material. The lower inner side of the housing 1 is symmetrically and elastically connected to a connecting plate 12 by a spring, and a sealing plate 13 is fixedly connected between the two connecting plates 12. During the rotation of the regulating air cylinder 4, the connecting plate 12 and the sealing plate 13 are pushed downward, and the sealing plate 13 blocks the air duct of the air intake fan 2 during the downward movement.

[0023] When the high-voltage variable frequency speed controller is working normally, the heat dissipation hole 3 and the air hole 5 on the regulating air cylinder 4 are connected to achieve normal ventilation and heat dissipation. When the equipment is shut down or a fault occurs, the first electric push rod 6 is controlled to push the lifting plate 8 down, so that the rack 9 and gear 10 mesh, thereby driving the uppermost regulating air cylinder 4 to rotate. Multiple regulating air cylinders 4 rotate synchronously through the synchronous belt, so that the heat dissipation hole 3 and the air hole 5 are staggered, thus blocking the heat dissipation hole 3. At this time, the air hole 5 is only connected to the inside of the housing 1. At the same time, the regulating air cylinder 4 located at the bottom pushes the connecting plate 12 and the sealing plate 13 to move down elastically through the lever 11, so that the sealing plate 13 blocks the air duct of the intake fan 2, thereby achieving the sealing of the entire housing 1 and preventing outside air from entering. After the sealing plate 13 has completed the sealing, the regulating air cylinder 4 continues to rotate, driving the lever 11 to bend, thereby increasing the downward force on the sealing plate 13, and preventing the sealing plate 13 from rising when the regulating air cylinder 4 rotates back slightly again, which would affect the sealing.

[0024] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing high-voltage variable frequency drives are inconvenient for rapid automatic fire extinguishing in the event of a fault or fire, and their explosion-proof safety is limited. To further solve this technical problem, this example discloses the following technical content, such as... Figures 2-8 As shown; a liquid storage tank 14 is fixedly installed inside the upper end of the box 1, and the inside of the liquid storage tank 14 is filled with liquid reactant. A liquid propulsion component is provided on the liquid storage tank 14. A reaction tube 18 is coaxially fixedly installed inside the regulating air cylinder 4, and the inside of the reaction tube 18 is filled with fixed reactant. When a fire occurs, the liquid propulsion component pushes the liquid reactant in the liquid storage tank 14 into each reaction tube 18. At the same time, the carbon dioxide generated by the reaction between the liquid reactant and the fixed reactant enters the inside of the box 1 through the air hole 5 to extinguish the fire.

[0025] The liquid propulsion assembly includes a second electric push rod 15 fixedly installed below the liquid storage tank 14. The output end of the second electric push rod 15 passes through the lower end of the liquid storage tank 14 and is fixedly connected to a sealing slider 16. The sealing slider 16 is slidably installed inside the liquid storage tank 14. The upper end of the liquid storage tank 14 is fixedly connected to an injection pipe 17. The reaction pipe 18 and the injection pipe 17 are rotatably connected. The reaction pipes 18 on adjacent regulating gas cylinders 4 are connected in series through a liquid guide pipe 19. An exhaust pipe 1803 is connected to the reaction pipe 18. A one-way valve is provided on the exhaust pipe 1803. The position of the exhaust pipe 1803 is higher than the liquid surface of the liquid reactant entering the inside of the reaction pipe 18. The gas generated by the reaction enters the inside of the box 1 through the exhaust pipe 1803 and the air hole 5.

[0026] After the air cylinder 4 is rotated, its air hole 5 is only connected to the inside of the box 1. When a fire is detected, the second electric push rod 15 is controlled to push the sealing slider 16 to move in the liquid storage tank 14. The sealing slider 16 pushes the liquid reactant in the liquid storage tank 14 into each reaction tube 18 through the injection pipe 17 and the guide pipe 19. The reactant reacts with the solid reactant in the reaction tube 18 to produce a large amount of carbon dioxide, which enters the inside of the box 1 through the exhaust pipe 1803 and the air hole 5 to achieve auxiliary fire extinguishing. The liquid reactant and solid reactant can be dilute hydrochloric acid and calcium carbonate, and the holding mechanism of both is made of corrosion-resistant material.

[0027] Heat exchange fins 1801 are evenly arranged on the outer side of the reaction tube 18, and hot air flows to the heat exchange fins 1801 through the air hole 5 during the heat dissipation process of the box 1. Filter screens 1802 are fixedly installed at both ends of the reaction tube 18.

[0028] The filter 1802 can prevent solid reactants in the reaction tube 18 from entering the liquid guide tube 19 and causing blockage. At the same time, when the high-voltage frequency converter is dissipating heat normally, the hot air inside will enter the inner side of the regulating air cylinder 4 and heat the reaction tube 18 through the heat exchange fins 1801, thus preventing the reactants from getting damp during storage.

[0029] The top of the housing 1 is provided with a pressure relief hole, and a pressure plug 20 is installed inside the pressure relief hole by means of a spring elastic lifting mechanism. The pressure plug 20 is set in the shape of an inverted frustum. A pull rope 22 is fixedly connected to the lower end of the pressure plug 20. A follower plate 21 is fixedly installed above the lifting plate 8, and the lower ends of the follower plate 21 and the pull rope 22 are fixedly connected. When the follower plate 21 moves down with the lifting plate 8, it tightens the pull rope 22. When the pressure plug 20 is depressurized and moves up, the pull rope 22 pulls the follower plate 21 and the lifting plate 8 to move up slightly.

[0030] As the air pressure inside the chamber 1 continues to rise, the pressure plug 20 can elastically rise under the action of air pressure to release pressure and exhaust air. At the same time, the pressure plug 20 will pull the follower plate 21 and the lifting plate 8 slightly upward through the pull rope 22, which will cause the rack 9 and gear 10 to re-mesh slightly, driving the regulating air cylinder 4 to rotate slightly, ensuring that the air hole 5 is always inside the chamber 1, thereby shaking and mixing the reagent inside the reaction tube 18, promoting the reaction and ensuring sufficient air supply.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An explosion-proof high-voltage variable frequency speed controller, comprising a housing (1), wherein an intake fan (2) is installed at the lower end of the housing (1), and heat dissipation holes (3) are evenly provided on both sides of the housing (1), characterized in that, An adjusting air cylinder (4) is installed on the inner side of the housing (1), and the adjusting air cylinder (4) is attached to the inner wall of the heat dissipation hole (3). Air holes (5) are symmetrically opened on the adjusting air cylinder (4). A first electric push rod (6) is fixedly installed on the inner side of the housing (1), and a pressure plate (7) is fixedly installed at the output end of the first electric push rod (6). A lifting plate (8) is elastically lifted and lowered below the pressure plate (7). A transmission assembly is connected between the lifting plate (8) and the shaft of the uppermost adjusting air cylinder (4). During the downward movement of the lifting plate (8), the adjusting air cylinder (4) is driven to rotate through the transmission assembly. At the same time, the shafts of adjacent adjusting air cylinders (4) on the same side are connected by synchronous belt transmission. The lower end of the housing (1) is inner An air intake sealing component is provided on the side, and when the regulating air cylinder (4) rotates, it drives the air intake sealing component to block the air duct of the air intake fan (2). A liquid storage tank (14) is fixedly installed inside the upper end of the box (1), and the liquid storage tank (14) is filled with liquid reactant. A liquid pushing component is provided on the liquid storage tank (14). A reaction tube (18) is fixedly installed coaxially on the inner side of the regulating air cylinder (4), and the reaction tube (18) is filled with fixed reactant. When a fire occurs, the liquid pushing component pushes the liquid reactant in the liquid storage tank (14) to each reaction tube (18). At the same time, the carbon dioxide generated by the reaction of the liquid reactant and the fixed reactant enters the inner side of the box (1) through the air hole (5) to extinguish the fire.

2. The explosion-proof high-voltage variable frequency speed controller according to claim 1, characterized in that: The transmission assembly includes a rack (9) symmetrically fixedly installed below the lifting plate (8), and a gear (10) fixedly installed on the shaft of the uppermost regulating air cylinder (4), and the rack (9) and the gear (10) meshing and connecting, while the lifting plate (8) drives the regulating air cylinder (4) to rotate during the downward movement.

3. The explosion-proof high-voltage variable frequency speed controller according to claim 2, characterized in that: The housing (1) is connected to the external space through the heat dissipation hole (3) and the air hole (5) on the regulating air cylinder (4), and the heat dissipation hole (3) and the air hole (5) are staggered after the regulating air cylinder (4) is rotated.

4. The explosion-proof high-voltage variable frequency speed controller according to claim 3, characterized in that: The air intake blocking assembly includes a lever (11) fixedly installed on the outside of the lowest regulating air cylinder (4), and the lever (11) is made of elastic material. The lower inner side of the housing (1) is connected to a connecting plate (12) by a spring in a symmetrical elastic lifting manner, and a blocking plate (13) is fixedly connected between the two connecting plates (12). During the rotation of the regulating air cylinder (4), the connecting plate (12) and the blocking plate (13) are pushed down, and the blocking plate (13) blocks the air duct of the air intake fan (2) during the downward movement.

5. The explosion-proof high-voltage variable frequency speed controller according to claim 1, characterized in that: The liquid propulsion assembly includes a second electric push rod (15) fixedly installed below the liquid storage tank (14), and the output end of the second electric push rod (15) passes through the lower end of the liquid storage tank (14) and is fixedly connected to a sealing slider (16), and the sealing slider (16) is slidably installed on the inner side of the liquid storage tank (14), and the upper end of the liquid storage tank (14) is fixedly connected to an injection pipe (17).

6. The explosion-proof high-voltage variable frequency speed controller according to claim 1, characterized in that: The reaction tube (18) and the injection tube (17) are sealed and rotatably connected, and the reaction tubes (18) on the adjacent regulating gas cylinders (4) are connected in series through the liquid guide tube (19). The reaction tube (18) is connected to the exhaust pipe (1803), and a one-way valve is provided on the exhaust pipe (1803). The position of the exhaust pipe (1803) is higher than the liquid surface of the liquid reactant entering the inside of the reaction tube (18), and the gas generated by the reaction enters the inside of the box (1) through the exhaust pipe (1803) and the air hole (5).

7. The explosion-proof high-voltage variable frequency speed controller according to claim 1, characterized in that: The outer side of the reaction tube (18) is uniformly provided with heat exchange fins (1801), and hot air flows to the heat exchange fins (1801) through the air hole (5) during the heat dissipation process of the box (1), and filter screens (1802) are fixedly installed at both ends of the reaction tube (18).

8. The explosion-proof high-voltage variable frequency speed controller according to claim 1, characterized in that: The top of the box (1) is provided with a pressure relief hole, and a pressure plug (20) is installed inside the pressure relief hole by means of a spring elastic lifting, and the pressure plug (20) is set in an inverted frustum structure.

9. The explosion-proof high-voltage variable frequency speed controller according to claim 8, characterized in that: The lower end of the pressure plug (20) is fixedly connected to a pull rope (22), and a follower plate (21) is fixedly installed above the lifting plate (8). The lower ends of the follower plate (21) and the pull rope (22) are fixedly connected. When the follower plate (21) moves down with the lifting plate (8), it tightens the pull rope (22). When the pressure plug (20) is depressurized and moves up, the pull rope (22) pulls the follower plate (21) and the lifting plate (8) to move up slightly.

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