Moisture-proof high-voltage switch cabinet

Abstract

This invention relates to the field of high-voltage switchgear technology, specifically a moisture-proof high-voltage switchgear, comprising a cabinet, an air inlet, an air outlet, and a negative pressure fan. When the negative pressure fan operates, it introduces external cold air into the cabinet through the air inlet, and the airflow carries away heat from inside the cabinet, expelling it through the air outlet. It also includes a flexible filter layer. A winding mechanism is installed on both sides of the air inlet on the cabinet. The two ends of the flexible filter layer are respectively wound and connected to the winding part of the winding mechanism. The flexible filter layer outside the winding mechanism covers the air inlet. A pulse jet mechanism matching the winding mechanism is provided on the cabinet. An air duct is provided at the air outlet, and the air duct is fluidly connected to the gas input part of the pulse jet mechanism. This invention integrates filter layer drying and dust removal functions, providing better cleaning of dirt and grime formed by dust and moisture on the filter layer surface compared to traditional brush cleaning methods, thereby ensuring the equipment's ventilation and heat dissipation effects and improving the stability of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and specifically to a moisture-proof high-voltage switchgear. Background Technology

[0002] With the rapid development of power grids, industrial power distribution and new energy industries, the demand for high-voltage power distribution equipment continues to rise. As a core set of equipment in the power system, high-voltage switchgear plays a role in power distribution, line control and fault protection.

[0003] Traditional high-voltage switchgear cooling and ventilation systems often have filter layers to intercept and filter dust and moisture in the environment, ensuring the cleanliness and heat dissipation efficiency inside the cabinet. However, after long-term operation, the filter layers are prone to accumulating dirt and need to be cleaned regularly. Conventional maintenance often uses brush cleaning to deal with dust accumulation on the filter layers. However, in high-humidity environments, dust on the filter layer surface easily combines with moisture to form sticky sludge. Simple cleaning is not enough to completely remove the dirt, which leads to obstructed ventilation and heat dissipation and affects the stability of equipment operation. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a moisture-proof high-voltage switchgear to solve the above problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A moisture-proof high-voltage switchgear includes a cabinet, an air inlet, an air outlet, and a negative pressure fan. When the negative pressure fan is running, it introduces external cold air into the cabinet through the air inlet. The airflow carries away the heat inside the cabinet and discharges it through the air outlet. It also includes a flexible filter layer. A winding drum mechanism is provided on both sides of the air inlet on the cabinet. The two ends of the flexible filter layer are respectively wound and connected to the winding part of the winding drum mechanism. The flexible filter layer located outside the winding drum mechanism covers the air inlet. The cabinet is equipped with a pulse jet mechanism that matches the winding drum mechanism, and an air duct is provided at the air outlet, which is in fluid communication with the gas input section of the pulse jet mechanism.

[0006] Preferably, the winding mechanism includes a cylinder body, with an upper cover plate and a lower cover plate rotatably connected inside the cylinder body. The bottom of the upper cover plate and the top of the lower cover plate are provided with grooves arranged in a circumferential array, and the direction of the grooves is perpendicular to the central axis of the cylinder body. An air injection pipe is coaxially and fixedly connected to the top cover plate, and the top end of the air injection pipe is rotatably connected to the top wall of the cylinder.

[0007] Preferably, it also includes several support rods, each of which is rotatably connected to a slider. The outer surface of the slider slides in contact with the inner wall of the groove, and a first spring is installed in the groove on one side of the slider. An opening is provided on one side of the cylinder, and the end of the flexible filter layer extends into the interior of the cylinder through the opening, and the end is fixedly connected to one of the support rods.

[0008] Preferably, a rotating cylinder is rotatably connected to the middle of the lower cover plate, a sleeve is fitted at the end of the rotating cylinder, a positioning plate is provided at the top of the sleeve, a positioning rod is provided at the bottom of the lower cover plate, the positioning plate and the positioning rod are slidably connected, a second spring is installed between the positioning plate and the bottom of the lower cover plate, and an air vent is provided on the side wall of the rotating cylinder.

[0009] Preferably, a wave groove is formed on the outer surface of the rotating drum, and a first ball bearing seat is provided inside the sleeve, with the balls on the first ball bearing seat slidingly engaging with the inner wall of the wave groove.

[0010] Preferably, the slider is provided with a push rod, the cross-section of which is L-shaped, and the rotating drum is provided with a trapezoidal push block that matches the push rod.

[0011] Preferably, it also includes a motor and a belt. The motor is mounted on the cabinet, and pulleys are coaxially connected to the air injection pipe located outside the cylinder and the output part of the motor. Multiple pulleys are wound and engaged with the belt.

[0012] Preferably, the pulse jet mechanism includes a pressure accumulator fixed on the cabinet, the input end of the pressure accumulator is in fluid communication with the air duct, the bottom of the pressure accumulator is provided with a guide tube seat, a movable tube is slidably connected through the guide tube seat, the bottom end of the movable tube is provided with a guide part, the guide part is inserted into the air injection tube and can slide inside it; The movable tube has a communication port on its side wall and a first solenoid valve at its top.

[0013] Preferably, the outer surface of the movable tube is provided with a threaded sleeve, and the bottom of the guide is provided with a second ball seat, wherein the balls of the second ball seat slide in cooperation with the spiral groove of the threaded sleeve.

[0014] Preferably, the negative pressure fan is installed on the top of the cabinet side wall, the position of the negative pressure fan matches the air outlet, and a second solenoid valve is provided on one side of the air duct.

[0015] The beneficial effects of this invention are as follows: 1. This invention integrates filter layer drying and dust removal functions. Compared with the traditional method of cleaning by brushing alone, it has a better cleaning effect on the dirt and grime formed by dust and water vapor on the filter layer surface, thereby ensuring the ventilation and heat dissipation effect of the equipment and improving the stability of equipment operation.

[0016] 2. When the flexible filter layer covering the air inlet becomes saturated with moisture or clogged with dust, the motor is started, causing the two sets of support cages to rotate in tandem. The section of the flexible filter layer that has completed the filtration operation is rolled up into the inside of one side of the cylinder, reaching the drying and dust removal station. At the same time, the spare filter layer section in the other cylinder is pulled out and replaced at the air inlet to continue filtration. This invention can achieve continuous and steady-state airflow filtration operation by relying on the cyclic switching of the filter layer.

[0017] 3. During the operation of this invention, the flexible filter layer is kept taut throughout the winding and unwinding process by the sliding support rod and the setting of the first spring. This can prevent problems such as winding deviation and positioning misalignment caused by filter layer slack, and can also buffer and adjust the filter layer tension to effectively avoid damage to the flexible filter layer caused by tension overload.

[0018] 4. This invention combines pulse jet cleaning and rapping cleaning to form a composite cleaning mechanism, which further improves the cleaning effect of the filter layer and ensures the ventilation and heat dissipation effect of the equipment.

[0019] 5. The present invention is equipped with a pressure relief mechanism. During the pulse jet cleaning process, the drive sleeve slides downward and the vent opens. Part of the high-pressure airflow is diverted and depressurized through the vent, which controls the wind pressure on the flexible filter layer within a safe range. This avoids excessive wind pressure causing the flexible filter layer to bear excessive mechanical stress, resulting in filter layer wear, local bulging and deformation, etc.

[0020] 6. This invention has the function of automatic switching of air passage, which can automatically match the working status of different sections of the flexible filter layer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the cabinet structure of the present invention.

[0023] Figure 3 This is a cross-sectional structural diagram of the cylindrical body of the present invention.

[0024] Figure 4 This is a schematic diagram of the rotating drum of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the active tube of the present invention.

[0026] Figure 6 For the present invention Figure 3 A magnified structural diagram of part A in the middle.

[0027] Figure 7 For the present invention Figure 3 A magnified structural diagram of section B in the middle.

[0028] Figure 8 This is a schematic diagram of the structure of the sleeve of the present invention.

[0029] In the attached diagram: 1. Cabinet; 2. Air inlet; 3. Cylinder; 4. Negative pressure fan; 5. Flexible filter layer; 6. Air duct; 7. Upper cover plate; 8. Lower cover plate; 9. Slide groove; 10. Support rod; 11. Slider; 12. First spring; 13. Rotary cylinder; 14. Positioning plate; 15. Positioning rod; 16. Wave groove; 17. First ball bearing seat; 18. Push rod; 19. Trapezoidal push block; 20. Motor; 21. Belt; 22. Air injection pipe; 23. Pulley; 24. Accumulator cylinder; 25. Guide tube seat; 26. Movable tube; 27. Guide part; 28. Connecting port; 29. ​​First solenoid valve; 30. Threaded sleeve; 31. Air vent; 32. Second spring; 33. Second solenoid valve; 34. Sleeve; 35. Second ball bearing seat. Detailed Implementation

[0030] The following will be for reference. Figures 1 to 8 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] A moisture-proof high-voltage switchgear, such as Figures 1-3 As shown, the system includes a cabinet 1, an air inlet 2, an air outlet, and a negative pressure fan 4. The negative pressure fan 4 is installed on the top of the side wall of the cabinet 1, and its position matches the air outlet. A second solenoid valve 33 is provided on one side of the air duct 6. When the negative pressure fan 4 is in operation, it creates a negative pressure environment inside the cabinet 1. Cold air from the outside flows into the cavity through the air inlet 2 and carries away the heat generated by the equipment through forced convection. Finally, the air is discharged outward through the air outlet, completing the ventilation and cooling of the cabinet 1 and preventing damage to the electrical components inside the cabinet 1 caused by high-temperature operation.

[0032] It also includes a flexible filter layer 5. A winding mechanism is provided on both sides of the air inlet 2 on the cabinet 1. The two ends of the flexible filter layer 5 are respectively wound and connected to the winding part of the winding mechanism. The flexible filter layer 5 located outside the winding mechanism covers the air inlet 2. In this embodiment, the flexible filter layer 5 is made of a hydrophilic filter material, which has excellent solid impurity interception and water vapor adsorption and separation performance. During the airflow passing through the flexible filter layer 5, dust particles and water vapor mixed in the air can be intercepted, improving the cleanliness and dryness of the airflow entering the cabinet 1. This prevents dust from accumulating and adhering to the surface of electrical components, causing failures such as reduced insulation performance and overheating. At the same time, it avoids safety hazards such as short circuits and aging of lines caused by water vapor condensation, and improves the overall safety and reliability of the equipment.

[0033] like Figure 3 , Figure 4 and Figure 7As shown, the winding drum mechanism includes a drum body 3, with an upper cover plate 7 and a lower cover plate 8 rotatably connected inside the drum body 3. The bottom of the upper cover plate 7 and the top of the lower cover plate 8 are provided with grooves 9 arranged in a circumferential array, and the direction of the grooves 9 is perpendicular to the central axis of the drum body 3. It also includes several support rods 10, with sliders 11 rotatably connected to both ends of the support rods 10. The outer surface of the sliders 11 slides in contact with the inner wall of the grooves 9. A first spring 12 is installed inside the grooves 9 on one side of the sliders 11. Through the cooperation of the grooves 9 and the sliders 11, the support rods 10 can slide along the direction of the grooves 9.

[0034] An opening is provided on one side of the cylinder 3, and the end of the flexible filter layer 5 extends into the interior of the cylinder 3 through the opening, and the end is fixedly connected to one of the support rods 10. In this embodiment, multiple support rods 10 form a support cage, and the upper cover plate 7 can be rotated to make the flexible filter layer 5 wrap around the support cage, and the flexible filter layer 5 forms a cylindrical shape.

[0035] An air injection pipe 22 is coaxially and fixedly connected to the upper cover plate 7. The top end of the air injection pipe 22 is rotatably connected to the top wall of the cylinder 3. When air is injected into the support cage through the air injection pipe 22, the airflow flushes and clears the sieve holes of the flexible filter layer 5, thereby cleaning the flexible filter layer 5.

[0036] like Figure 2 and Figure 3 As shown, it also includes a motor 20 and a belt 21. The motor 20 is a servo motor that can rotate in both directions. The motor 20 is mounted on the cabinet 1. The air injection pipe 22 located outside the cylinder 3 and the output part of the motor 20 are coaxially connected to pulleys 23. Multiple pulleys 23 are wound and engaged with the belt 21. When the flexible filter layer 5 covering the air inlet 2 becomes wet and saturated or clogged with dust, the filtration efficiency decreases. At this time, the motor 20 is started, and the motor 20 drives the corresponding pulley 23 to rotate. The belt 21 drives the other pulleys 23 to rotate synchronously, thereby realizing the coordinated rotation of the two sets of support cages. The section of the flexible filter layer 5 that has completed the filtration operation is rolled up into the inside of one side of the cylinder 3 to reach the drying and dust removal operation station. At the same time, the spare filter layer section in the other cylinder 3 is extracted and replaced at the air inlet 2 to continue filtration. This device can realize continuous and steady-state airflow filtration operation by relying on the cyclic switching of filter layers.

[0037] To further explain, this device is equipped with a humidity sensor and an airflow sensor to collect the humidity parameters of the flexible filter layer 5 and the flow parameters of the air duct 6 in real time, thereby determining abnormal states such as filter layer humidity and dust blockage. Combined with the microcontroller control system, it can automatically adjust the motor 20 and filter layer transmission actions according to the state of the flexible filter layer 5 to complete the fully automated operation.

[0038] like Figure 3 , Figure 5 and Figure 6As shown, the cabinet 1 is equipped with a pulse jet mechanism that matches the winding drum mechanism. An air duct 6 is provided at the air outlet. The air duct 6 is in fluid communication with the gas input section of the pulse jet mechanism. The pulse jet mechanism includes a pressure accumulator 24 fixed on the cabinet 1. The input end of the pressure accumulator 24 is in fluid communication with the air duct 6. The hot air after heat exchange inside the cabinet 1 is input into the interior of the pressure accumulator 24 through the air duct 6.

[0039] The bottom of the accumulator 24 is provided with a guide tube seat 25, and a movable tube 26 is slidably connected through the guide tube seat 25. The bottom end of the movable tube 26 is provided with a guide part 27, such as... Figure 6 As shown, in this embodiment, the cross-section of the guide portion 27 is elliptical, and the guide portion 27 is inserted into the air injection tube 22 and can slide up and down inside it.

[0040] A connecting port 28 is provided on the side wall of the movable tube 26, and a first solenoid valve 29 is provided at the top of the movable tube 26. When the connecting port 28 corresponds to the inner wall of the guide tube seat 25, the connecting port 28 is blocked. When the movable tube 26 slides upward relative to the guide tube seat 25, the connecting port 28 no longer corresponds to the guide tube seat 25. When the accumulator 24 is fluidly connected to the air injection pipe 22 through the movable tube 26, the gas in the accumulator 24 is input into the interior of the support cage through the air injection pipe 22.

[0041] The outer surface of the movable tube 26 is provided with a threaded sleeve 30, and the bottom of the guide part 27 is provided with a second ball seat 35. The balls of the second ball seat 35 slide in cooperation with the spiral groove of the threaded sleeve 30. When the air injection tube 22 rotates, it drives the movable tube 26 to rotate synchronously with the threaded sleeve 30. With the arrangement of the second ball seat 35, the air injection tube 22 moves up or down.

[0042] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, a rotating cylinder 13 is rotatably connected to the middle of the lower cover plate 8. A sleeve 34 is fitted at the end of the rotating cylinder 13. A positioning plate 14 is provided at the top of the sleeve 34. A positioning rod 15 is provided at the bottom of the lower cover plate 8. The positioning plate 14 and the positioning rod 15 slide through each other. The positioning rod 15 plays a guiding and positioning role, which can improve the stability of the positioning plate 14 and the sleeve 34 moving up and down. A second spring 32 is installed between the positioning plate 14 and the bottom of the lower cover plate 8. A vent 31 is opened on the side wall of the rotating cylinder 13.

[0043] A wave groove 16 is provided on the outer surface of the rotating drum 13, and a first ball seat 17 is provided inside the sleeve 34. The balls on the first ball seat 17 slide in cooperation with the inner wall of the wave groove 16. During the repeated up and down movement of the sleeve 34, the balls on the first ball seat 17 slide inside the wave groove 16, driving the rotating drum 13 to rotate.

[0044] like Figure 3 , Figure 4 and Figure 7 As shown, the slider 11 is provided with a push rod 18, the cross-section of the push rod 18 is L-shaped, and the rotating cylinder 13 is provided with a trapezoidal push block 19 that matches the push rod 18. During the rotation of the rotating cylinder 13, when the inclined surface of the trapezoidal push block 19 abuts the push rod 18, the push rod 18 pulls the support rod 10 to move away from the flexible filter layer 5 along the direction of the slide groove 9. At the same time, the first spring 12 is compressed and stored. When the trapezoidal push block 19 passes the push rod 18, the first spring 12 releases its force and pushes the support rod 10 to instantly reset. The support rod 10 impacts the flexible filter layer 5 to perform vibration cleaning and improve the cleaning effect of the filter layer.

[0045] The working principle of this device is as follows: This device is equipped with a humidity sensor and an airflow sensor to detect the humidity parameters of the flexible filter layer 5 and the flow parameters of the air duct 6 in real time. When the flexible filter layer 5 is detected to be saturated with humidity or clogged with dust, the sensor sends a signal to the microcontroller control system. After receiving the signal, the control system drives the motor 20 to run. The motor 20 drives the corresponding pulley 23 to rotate, and through the belt 21, all pulleys 23 rotate synchronously, thereby realizing the coordinated rotation of the two sets of support cages. The section of the flexible filter layer 5 that has completed the filtration operation is rolled up into the inside of one side cylinder 3 to reach the drying and dust removal operation station. This section of the flexible filter layer 5 forms a cylindrical shape. At the same time, the spare filter layer section in the other cylinder 3 is extracted and replaced at the air inlet 2 to continue filtration. By relying on the cyclic switching of filter layers, continuous and steady-state airflow filtration operation can be achieved.

[0046] During equipment operation, the support rod 10 can slide linearly along the slide groove 9. Combined with the elastic pre-tightening effect of the first spring 12, the flexible filter layer 5 is kept in a taut state throughout the winding and unwinding process. This can prevent problems such as winding deviation and positioning misalignment caused by filter layer slack, and can also buffer and adjust the filter layer tension, effectively avoiding damage to the flexible filter layer 5 caused by tension overload.

[0047] It should be noted that when the pulley 23 on the cylinder 3 on the winding side of the flexible filter layer 5 rotates, the coaxial air injection pipe 22 rotates accordingly, and drives the corresponding movable pipe 26 and threaded sleeve 30 to rotate synchronously. With the setting of the second ball bearing seat 35, the air injection pipe 22 moves upward and is inserted into the accumulator cylinder 24. At this time, the connecting port 28 is misaligned with the inner wall of the guide pipe seat 25, the air passage is opened, and the gas inside the accumulator cylinder 24 is introduced into the inner cavity of the support cage through the air injection pipe 22 to carry out the drying operation on the cylindrical flexible filter layer 5.

[0048] On the other side of the cylinder 3, the pulley 23 rotates in the opposite direction, causing the corresponding air injection pipe 22 to move downward, and the connecting port 28 to correspond to the inner wall of the guide pipe seat 25, thereby blocking the air passage; this device has the function of automatically switching the air passage to automatically match the working status of different sections of the flexible filter layer 5.

[0049] It is worth noting that the connecting port 28 adopts a small diameter design and has a small air flow rate. During the operation of the negative pressure fan 4, the pressure accumulator 24 continuously accumulates pressure. In this embodiment, the control system controls the first solenoid valve 29 to open and close intermittently, which instantaneously increases the jet flow rate and jet pressure of the air injection pipe 22, forming a pulse jet airflow to purge and clear the filter pores of the flexible filter layer 5 under high pressure, ensuring the filtration performance of the filter layer in subsequent use.

[0050] It should be noted that during pulse jet cleaning, if the jet pressure is too high, the flexible filter layer 5 will be subjected to excessive mechanical stress, which may lead to filter layer wear, local bulging and deformation, and thus increase the cost of equipment maintenance and parts replacement. To address this, the device is equipped with a pressure relief structure that allows the sliding sleeve 34 to cooperate with the vent 31. The air pressure thrust generated by the pulse jet drives the sleeve 34 to slide downward, opening the vent 31. Part of the high-pressure airflow is diverted and depressurized through the vent 31 (at the same time, impurities in the cylindrical flexible filter layer 5 can also be carried out by the airflow), keeping the air pressure on the flexible filter layer 5 within a safe range.

[0051] It is worth noting that after a single pulse jet cleaning is completed, the elastic restoring force of the second spring 32 drives the sleeve 34 to reset. During continuous pulse operation, the sleeve 34 reciprocates. Through the cooperation between the first ball bearing seat 17 and the wave groove 16, the rotating drum 13 is driven to rotate. The rotating drum 13 drives the trapezoidal push block 19 to rotate. When the inclined surface of the trapezoidal push block 19 abuts against the push rod 18, the push rod 18 is pulled and drives the support rod 10 to slide along the slide groove 9 away from the flexible filter layer 5, simultaneously compressing the first spring 12 to store energy. When the trapezoidal push block 19 rotates with the rotating drum 13 and disengages from the push rod 18, the first spring 12 releases its force and pushes the support rod 10 to reset instantaneously. The support rod 10 impacts the flexible filter layer 5 to perform vibration cleaning, forming a composite cleaning mechanism with the pulse jet cleaning, further improving the cleaning effect of the filter layer.

[0052] After the dust removal operation is completed, the second solenoid valve 33 is opened, and the gas in the air duct 6 is directly discharged from the second solenoid valve 33, avoiding the wear of the filter layer caused by ineffective continuous pulse dust removal operation.

[0053] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A moisture-proof high-voltage switchgear, comprising a cabinet (1), an air inlet (2), an air outlet, and a negative pressure fan (4), wherein the negative pressure fan (4) introduces external cold air into the cabinet (1) through the air inlet (2) during operation, and the airflow carries away the heat inside the cabinet (1) and discharges it through the air outlet, characterized in that, It also includes a flexible filter layer (5). A winding mechanism is provided on both sides of the air inlet (2) on the cabinet (1). The two ends of the flexible filter layer (5) are respectively wound and connected to the winding part of the winding mechanism. The flexible filter layer (5) located outside the winding mechanism covers the air inlet (2). The cabinet (1) is equipped with a pulse jet mechanism that matches the winding drum mechanism, and an air duct (6) is provided at the air outlet. The air duct (6) is fluidly connected to the gas input section of the pulse jet mechanism.

2. The damp-proof high-voltage switch cabinet according to claim 1, characterized in that, The winding mechanism includes a cylinder (3), with an upper cover plate (7) and a lower cover plate (8) rotatably connected inside the cylinder (3). The bottom of the upper cover plate (7) and the top of the lower cover plate (8) are provided with grooves (9) arranged in a circumferential array. The direction of the grooves (9) is perpendicular to the central axis of the cylinder (3). An air injection pipe (22) is coaxially and fixedly connected to the top cover plate (7), and the top end of the air injection pipe (22) is rotatably connected to the top wall of the cylinder (3).

3. The damp-proof high-voltage switch cabinet according to claim 2, characterized in that It also includes several struts (10), with sliders (11) rotatably connected to both ends of the struts (10). The outer surface of the sliders (11) slides against the inner wall of the groove (9). A first spring (12) is installed in the groove (9) on one side of the sliders (11). An opening is provided on one side of the cylinder (3), and the end of the flexible filter layer (5) extends into the interior of the cylinder (3) through the opening, and the end is fixedly connected to one of the support rods (10).

4. A moisture-proof high-voltage switchgear according to claim 3, characterized in that, A rotating cylinder (13) is rotatably connected to the middle of the lower cover plate (8). A sleeve (34) is fitted at the end of the rotating cylinder (13). A positioning plate (14) is provided at the top of the sleeve (34). A positioning rod (15) is provided at the bottom of the lower cover plate (8). The positioning plate (14) and the positioning rod (15) slide through each other. A second spring (32) is installed between the positioning plate (14) and the bottom of the lower cover plate (8). A vent (31) is opened on the side wall of the rotating cylinder (13).

5. The moisture-proof high-voltage switch cabinet according to claim 4, characterized in that A wave groove (16) is provided on the outer surface of the rotating cylinder (13), and a first ball seat (17) is provided inside the sleeve (34). The balls on the first ball seat (17) slide in cooperation with the inner wall of the wave groove (16).

6. The moisture-proof high-voltage switch cabinet according to claim 5, characterized in that The slider (11) is provided with a push rod (18), the cross-section of the push rod (18) is L-shaped, and the rotating cylinder (13) is provided with a trapezoidal push block (19) that matches the push rod (18).

7. The moisture-proof high-voltage switch cabinet according to claim 2, characterized in that, It also includes a motor (20) and a belt (21). The motor (20) is mounted on the cabinet (1). The air injection pipe (22) located outside the cylinder (3) and the output part of the motor (20) are coaxially connected to pulleys (23). Multiple pulleys (23) are wound and engaged with the belt (21).

8. The moisture-proof high-voltage switch cabinet according to claim 2, characterized in that The pulse jet mechanism includes a pressure accumulator (24) fixed on the cabinet (1). The input end of the pressure accumulator (24) is in fluid communication with the air duct (6). The bottom of the pressure accumulator (24) is provided with a guide tube seat (25). A movable tube (26) is slidably connected through the guide tube seat (25). The bottom end of the movable tube (26) is provided with a guide part (27). The guide part (27) is inserted into the air injection tube (22) and can slide inside it. A communication port (28) is provided on the side wall of the movable tube (26), and a first solenoid valve (29) is provided at the top of the movable tube (26).

9. The moisture-proof high-voltage switch cabinet according to claim 8, characterized in that The outer surface of the movable tube (26) is provided with a threaded sleeve (30), and the bottom of the guide part (27) is provided with a second ball seat (35). The balls of the second ball seat (35) slide in cooperation with the spiral groove of the threaded sleeve (30).

10. The moisture-proof high-voltage switch cabinet according to claim 1, characterized in that The negative pressure fan (4) is installed on the top of the side wall of the cabinet (1). The position of the negative pressure fan (4) matches the air outlet. A second solenoid valve (33) is provided on one side of the air duct (6).

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