Voltage transformer for ring main unit

Abstract

The invention relates to a voltage transformer for a ring main unit, and the voltage transformer comprises a transformer body, the top of the transformer body is provided with a wiring board and a dust cover, the inner side of the dust cover is rotatably provided with a screw rod I and is fixedly provided with a guide rod, the screw rod I is in threaded connection with a bump at the side part of a fan, and the guide rod is in sliding connection with a bump at the other side of the fan; a first motor for driving the first lead screw to rotate is installed on one side of the dustproof cover. By arranging a double-filter-plate structure capable of moving alternately and cooperating with a cleaning assembly driven by a fan, the automatic cleaning and brushing function of a filter face is achieved, when dust is accumulated on the filter plate on one side, the system can be switched to a standby filter plate to work, meanwhile, through linkage of an L-shaped plate and a long strip block, a brush plate is driven to conduct reciprocating cleaning on the dust accumulation filter face, and the cleaning efficiency is improved. The technical problems that a traditional filter screen is easy to block and inconvenient to clean manually are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformers, and in particular to a voltage transformer for a ring network cabinet. Background Art

[0002] As a key equipment in urban distribution networks, ring main units undertake important functions of power distribution, protection and control. They are the core components for voltage measurement, protection and control. Their function is to convert high voltage into low voltage signals in proportion for use by metering instruments, relay protection devices and automation systems.

[0003] The applicant's search revealed that traditional terminal blocks are mostly made of metal but lack effective heat dissipation structures. When current flows through them, the heat generated by contact resistance is difficult to dissipate quickly, resulting in excessive localized temperature rise. Long-term high-temperature operation not only accelerates the aging of insulation materials but can also cause problems such as deformation and loosening of the terminal blocks, further exacerbating the risk of connection reliability. Existing technologies mostly use air cooling for heat dissipation, but air cooling requires the use of filters to prevent dust from settling on the terminal blocks. However, over time, dust easily accumulates on the filter plates, causing blockages. Manual cleaning and replacement are very inconvenient and troublesome.

[0004] Therefore, the inventor particularly needs to design a voltage transformer for a ring main unit to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a voltage transformer for a ring main unit to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a voltage transformer for a ring network cabinet, comprising: a body, a terminal block and a dust cover are installed on the top of the body, a screw rod is rotatably installed on the inside of the dust cover and a guide rod is fixed thereto, the screw rod is threadedly connected to a convex block on the side of the fan, and the guide rod is slidably connected to the convex block on the other side of the fan, a motor is installed on one side of the dust cover to drive the screw rod to rotate, the top of the dust cover is provided with an opening, and the top of the inner top is fitted with two spliced ​​filter plates, the filter plate is concave in design and a cleaning assembly is installed in the middle of the concave surface, the top of the dust cover is provided with an air inlet, and the air inlet has the same area as the concave surface of the filter plate;

[0007] The cleaning component includes a hollow box fixed in the middle of the concave surface of the filter plate, and the filtering surfaces are arranged on both sides of the hollow box. A slider is slidingly mounted on the inner wall of the hollow box, and a lifting block is slidingly installed inside the slider. Brush plates passing through the slider and the side opening of the hollow box are fixed on both sides of the lifting block, and the brush plates can move up and down in the two openings. A long strip is fixed at the bottom of the slider, and the long strip passes through the opening on the bottom surface of the filter plate, and a notch on one side of the long strip can be engaged with an L-shaped plate. The two L-shaped plates are respectively fixed on both sides of the top of the fan.

[0008] Preferably, a convex limit block is provided on one side of the long strip, and the convex limit block slides inside the slide one, and the slide one is fixed on one side of the dust cover. When the long strip is engaged with the L-shaped plate, the convex limit block moves out of the slide one and is located near one side of it.

[0009] Preferably, a notch is provided at the corner of the upper end of the lifting block, and the notch also fits and slides inside the slider, and an insert block can be inserted into the inner wall of the notch, and the insert block slides in the inner opening of the slider, and a spring 1 is connected to the insert block and the inner side of the opening. The bottom of the outer end of the insert block is designed as an arc surface, and a slope block 1 is provided on the top of the insert block, and the slope block 1 slides in the cavity above the inner opening of the slider, and a slope block 2 is fixed to the inside of the hollow box, and the slope block 2 can be inserted into the cavity from one side of the slider, and the slope of the slope block 2 can fit with the slope of the slope block 1.

[0010] Preferably, spring 2 is connected to the top of the lifting block and the top of the inner part of the slider, the bottom corner of the lifting block is designed as a slope, and a slope block 3 is installed on the other end of the inner side of the hollow box relative to the slope block 2. The slope block 3 can be inserted from the opening on one side of the slider and contact the slope of the bottom corner of the lifting block, so that the lifting block rises and compresses spring 2.

[0011] Preferably, two sponge sheets are bonded to the inner sides of the openings on both sides of the hollow box through which the brush plates pass.

[0012] Preferably, two collecting boxes are inserted into the opening on one side of the dust cover, and both ends of the collecting boxes are fitted with the inner wall of the dust cover. The filter plate is U-shaped, that is, one end is an open end, and the concave surface of the filter plate is facing the collection box and the end of the open end. A slope is provided, and the top of the collection box is fitted with the inner top surface of the dust cover, and a dust adsorption structure can be installed inside the collection box. A low surface is provided at one end of the collection box, and the low surface is in contact with the bottom of the filter plate.

[0013] Preferably, a baffle is installed at the top of the inner part of the dust cover, and both sides of the baffle are in contact with the side walls of the collection box. The baffle can contact the open end of the filter plate, and the baffle is located below the air inlet.

[0014] Preferably, a protective plate is installed on the inner side of the air inlet at the top of the dust cover, and the protective plate is used to protect the brush plate;

[0015] Preferably, the two spliced ​​side walls of the filter plates jointly fix the sliding plate, and the convex limit plate on one side of the sliding plate slides in the fixed slideway 2 on the inner side of the dust cover. The sliding plate is threadedly connected to the screw rod 2, and the screw rod 2 is rotatably installed on the inner wall of the dust cover and is driven to rotate by the motor 2 installed on the side wall of the dust cover.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention realizes the automatic cleaning function of the filter surface by setting up a double filter plate structure that can be moved alternately and cooperating with a cleaning component driven by a fan. When dust accumulates on one filter plate, the system can switch to the spare filter plate. At the same time, through the linkage of the L-shaped plate and the long strip block, the brush plate is driven to clean the dust-accumulated filter surface back and forth, effectively solving the technical problems of the traditional filter screen that is easy to clog and inconvenient to clean manually.

[0018] 2. The innovative design of the lifting block and multiple inclined blocks work together to intelligently lock and release the blocks, ensuring that the brush plate only contacts the filter surface for cleaning during the outward stroke and automatically lifts out of contact during the return stroke. Combined with the inclined design of the collection box, this ensures one-way dust discharge to the collection box, completely eliminating the "dirt carryback" problem caused by traditional reciprocating cleaning.

[0019] 3. The present invention adopts a combined design of a U-shaped filter plate and a baffle, which forms a closed air duct during operation, ensuring that the heat dissipation airflow passes through the filter surface while preventing unfiltered air from infiltrating. In addition, the opening and inclined surface on one side of the filter plate plus the collection box design facilitate the discharge and collection of the cleaned dust, which is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 The present invention is a three-dimensional integral circuit of a voltage transformer for a ring network cabinet. Figure 1 ;

[0022] Figure 2 The present invention is a three-dimensional integral circuit of a voltage transformer for a ring network cabinet. Figure 2 ;

[0023] Figure 3 The present invention is a three-dimensional integral circuit of a voltage transformer for a ring network cabinet. Figure 3 ;

[0024] Figure 4 This is a partial three-dimensional structure of a voltage transformer for a ring network cabinet of the present invention. Figure 1 ;

[0025] Figure 5 A three-dimensional cleaning component for a voltage transformer used in a ring network cabinet of the present invention Figure 1 ;

[0026] Figure 6 The present invention is a three-dimensional cleaning component of a voltage transformer for a ring network cabinet Figure 2 ;

[0027] Figure 7 A three-dimensional cleaning component for a voltage transformer used in a ring network cabinet of the present invention Figure 3 ;

[0028] Figure 8 This is a partial three-dimensional structure of a voltage transformer for a ring network cabinet of the present invention. Figure 2 ;

[0029] Figure 9 This is a partial front view structural diagram of a voltage transformer for a ring main unit according to the present invention;

[0030] Figure 10 This is a sectional perspective view of a slider of a voltage transformer for a ring main unit according to the present invention;

[0031] Figure 11 This is a three-dimensional diagram of a baffle of a voltage transformer for a ring main unit according to the present invention.

[0032] In the picture:

[0033] 1. Device body; 11. Terminal block; 12. Dust cover; 13. Fan; 14. Guide rod; 15. Screw rod 1; 16. Motor 1; 17. Filter plate; 18. Protective plate; 19. Collecting box; 110. Baffle; 111. Sliding plate; 112. Screw rod 2; 113. Slideway 2; 114. Motor 2; 2. Cleaning assembly; 20. Hollow box; 21. Lifting block; 22. Brush plate; 23. Long strip block; 24. L-shaped plate; 25. Convex limit block; 26. Slideway 1; 27. Insert block; 28. Spring 1; 29. ​​Inclined block 1; 210. Spring 2; 211. Sponge sheet; 212. Inclined block 2; 213. Slider. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0035] like Figures 1-11 As shown, a voltage transformer for a ring network cabinet of the present invention comprises a body 1, a terminal block 11 and a dust cover 12 mounted on the top of the body 1, a screw rod 15 rotatably mounted on the inside of the dust cover 12 and fixed with a guide rod 14, the screw rod 15 is threadedly connected to a convex block on the side of the fan 13, and the guide rod 14 is slidably connected to a convex block on the other side of the fan 13, a motor 16 for driving the screw rod 15 to rotate is mounted on one side of the dust cover 12, an opening is provided on the top of the dust cover 12 and two spliced ​​filter plates 17 are fitted and slidably on the top end of the inner portion, the filter plate 17 is concave in design and a cleaning assembly 2 is mounted in the middle of the concave surface, an air inlet is provided on the top of the dust cover 12, and the air inlet and the concave surface area of ​​the filter plate 17 are the same, when one filter plate 17 is in the air inlet position, the side wall of the other filter plate 17 contacts the inner wall of the dust cover 12, and a wire outlet a is provided on the bottom of one side of the dust cover 12;

[0036] The cleaning component 2 includes a hollow box 20 fixed in the middle of the concave surface of the filter plate 17. The bottom of the hollow box 20 has no surface and is designed to be open. The filtering surfaces are arranged on both sides of the hollow box 20. A slider 213 is fitted and slidably on the inner wall of the hollow box 20. A lifting block 21 is slidably installed inside the slider 213. Brush plates 22 are fixed on both sides of the lifting block 21, passing through the slider 213 and the side opening of the hollow box 20. The brush plates 22 can move up and down in the two openings. A long strip 23 is fixed at the bottom of the slider 213. The long strip 23 passes through the bottom opening of the filter plate 17, and the notch on one side of the long strip 23 can be engaged with an L-shaped plate 24. The two L-shaped plates 24 are respectively fixed on both sides of the top of the fan 13.

[0037] As mentioned above, the voltage transformer is installed at the bottom of the ring network cabinet (designed according to most cases), the terminal block is located at the top of the inductor, and the wiring is connected through the outlet a. The dust cover 12 is a detachable design. When working, through the design of the cleaning component 2, the two filter plates 17 are alternately located at the air inlet position for protection. When the terminal block is dissipated, the motor 16 is started, and the screw rod 15 reciprocates through the limit of the guide rod 14, so that the fan 13 is restarted and moves horizontally back and forth to blow air back and forth for heat dissipation. A filtered air outlet can be opened on the dust cover 12, which is not shown in the figure. When a filter plate 17 is concave, the filter After a certain amount of dust accumulates on the surface, the two spliced ​​filter plates 17 can be slid and the other filter plate 17 can be moved to the bottom of the air outlet. At this time, the previous filter plate 17 moves to the side and contacts the inner wall of the dust cover 12, and the lower end of the long strip block 23 at the bottom of this filter plate 17 is notched and stuck on the outside of the vertical end of the L-shaped plate 24. At this time, when the fan 13 moves back and forth, the L-shaped plate 24 can drive the long strip block 23 to move, and the long strip block 23 drives the slider 213 to move back and forth in the hollow box 20. The lifting block 21 can drive the brush plates 22 on both sides to move back and forth, and the filter surface can be cleaned, which is very convenient.

[0038] A convex stopper 25 is provided on one side of the long block 23. The convex stopper 25 slides inside a slideway 26. The slideway 26 is fixed to one side of the dust cover 12. When the long block 23 is engaged with the L-shaped plate 24, the convex stopper 25 moves out of the slideway 26 and is located near one side thereof.

[0039] Two collection boxes 19 are inserted into the opening on one side of the dust cover 12 and fixed by a conventional limiting structure. The two ends of the collection box 19 are fitted with the inner wall of the dust cover 12. The filter plate 17 is U-shaped, that is, one end is an open end, and the concave surface of the filter plate 17 faces the collection box 19 and the end of the open end is provided with an inclined surface, which is convenient for the cleaned dust to be discharged from the collection box 19 through the inclined surface. The top of the collection box 19 is fitted with the top surface inside the dust cover 12, and a dust adsorption structure can be installed inside the collection box 19, which is not described in detail here. A low surface is provided at one end of the collection box 19, and the low surface is in contact with the bottom of the filter plate 17, so that the space for cleaning and collection is in a closed state. A baffle 110 is installed at the top of the inside of the dust cover 12, and the two sides of the baffle 110 are fitted with the side walls of the collection box 19. The baffle 110 can contact the open end of the filter plate 17, and the baffle 110 is located below the air inlet.

[0040] Furthermore, the convex stop block 25 can ensure the initial position of the long strip block 23, that is, the long strip block 23 and the L-shaped plate 24 are both aligned on one side of the slide 26, and the vertical end of the L-shaped plate 24 is located very close to the end of the slide 26, ensuring that the long strip block 23 can be engaged with the L-shaped plate 24 after leaving the slide 26. When cleaning is not required, the used filter plate 17 does not contact the inner wall of the dust cover 12 when it moves to the edge of the air outlet, so that the convex stop block 25 does not move out of the slide 26, but the two side surfaces inside the working filter plate 17 are not completely aligned with the inner wall of the air inlet, but it does not affect the overall work. The baffle 110 closes the open end of the working filter plate 17, see details. Figure 11 That's it. The dotted line in the figure is the inner wall position of the top air outlet of the working filter plate 17. When cleaning is needed, it can be moved a short distance. These distance controls and time points can be operated by manually driving the controller, which is an existing conventional technical operation method. The collection box 19 can be taken out and replaced after a period of time.

[0041] A notch is provided at the corner of the upper end of the lifting block 21, and the notch also fits and slides inside the slider 213. An insert block 27 can be inserted into the inner wall of the notch. The insert block 27 slides in the inner opening of the slider 213. A spring 1 28 is connected to the inner side of the insert block 27. The bottom of the outer end of the insert block 27 is designed as an arc surface. A slope block 1 29 is provided on the top of the insert block 27. The slope block 1 29 slides in the cavity above the inner opening of the slider 213. A slope block 212 is fixed to the inside of the hollow box 20. The slope block 212 can be inserted into the cavity from one side of the slider 213, and the slope of the slope block 212 can fit with the slope of the slope block 1 29.

[0042] The top of the lifting block 21 and the top of the slider 213 are connected with spring 210. The bottom corner of the lifting block 21 is designed as a slope, and the other end of the inner side of the hollow box 20 relative to the slope block 212 is installed with slope block 3 26. The slope block 3 26 can be inserted from the opening on one side of the slider 213 and contact the slope of the bottom corner of the lifting block 21, so that the lifting block 21 rises and compresses spring 210.

[0043] The above structural design has certain disadvantages when cleaning, that is, the back and forth cleaning is likely to bring dirt back, and even cause dirt to penetrate the filter surface due to squeezing. Therefore, in the initial position, that is, when the brush plate 22 is located at the end away from the inclined surface of the filter surface, the plug block 27 is located above the lifting block 21 and is not inserted into the socket, and the brush plate 22 is in contact with the filter. At this time, by moving to clean, the dirt is driven to the inclined surface and falls into the collection box 19, and at this time, the inclined surface block 3 26 is inserted from the opening on one side of the slider 213 and contacts the inclined surface of the bottom corner of the lifting block 21, so that the lifting block 21 is raised and the brush plate 22 is moved. Separated from the filtering surface to avoid bringing dirt back during the return journey, at the same time, the arc surface at the bottom of the insert block 27 is squeezed and compressed into the socket, compressing spring 1 28. When it rises to a suitable height, the insert block 27 can be inserted into the socket of the lifting block 21, so that the lifting block 21 will not fall. At this time, spring 210 is compressed. When the slider 213 moves to the other end, the inclined block 212 is inserted into the cavity of the slider 213, pushing the inclined block 1 29 to move the insert block 27 back, so that the insert block 27 pops out from the socket inside the notch of the lifting block 21. At this time, spring 2 causes the lifting block 21 to fall, and the brush plate 22 contacts the filtering surface again, ensuring a one-way cleaning effect.

[0044] Two sponge sheets 211 are glued to the inner sides of the openings on both sides of the hollow box 20 through which the brush plates 22 pass, so as to prevent dust from entering the interior of the hollow box 20 to the greatest extent. A protective plate 18 is installed on the inner side of the air inlet on the top of the dust cover 12. The protective plate 18 is used to protect the brush plate 22, so as to protect the brush plate 22 on the working filter plate 17 to prevent some falling objects and dust from falling on the filter plate 17.

[0045] The side walls of the two spliced ​​filter plates 17 jointly fix the sliding plate 111, and the convex limit plate on one side of the sliding plate 111 slides in the fixed slide 2 113 on the inner side of the dust cover 12. The sliding plate 111 is threadedly connected with the screw rod 2 112, and the rod 2 112 is rotatably installed on the inner wall of the dust cover 12 and driven to rotate by the motor 2 114 installed on the side wall of the dust cover 12. The displacement of the two spliced ​​filter plates 17 is performed in a manner similar to the fan 13. When driven to move, the moving motor 2 114 moves the screw rod 2 112 to make the sliding plate 111 slide in the slide 2 113, thereby driving the two spliced ​​filter plates 17 to adjust their positions.

[0046] Working Principle: First, under normal operating conditions, motor 16 drives screw 15 to rotate, driving fan 13 to move horizontally back and forth along guide rod 14, blowing air to the terminal block, forming a sweeping heat dissipation airflow. The airflow enters the internal part of the device through the currently working filter plate 17 for heat dissipation. When it detects that the dust accumulation on the filter plate 17 has reached a set threshold, the control system (existing conventional design) starts motor 2 114, which drives the sliding plate 111 to move via screw 2 112, switching the spare filter plate 17 to the working position. At the same time, the original working filter plate 17 moves to the side cleaning station. At the cleaning station, the long block 23 of the filter plate 17 (the convex limit block 25 on the side moves out of slide 1 26) automatically engages with the L-shaped plate 24 at the top of the fan 13. As the fan 13 continues to reciprocate, the L-shaped plate 24 drives the long block 23 to cause the slider 213 to move back and forth within the hollow box 20. During the movement, when the slider 213 moves to one end of the inclined block three 26, the lifting block 21 is lifted up, so that the brush plate 22 is separated from the filter surface; when the slider 213 passes the inclined block two 212, the insert block 27 is pushed to make the lifting block 21 descend, and the brush plate 22 contacts the filter surface again, thereby realizing the one-way cleaning function. The dust swept down slides along the inclined surface of the filter plate 17 into the collection box 19, completing the self-cleaning process. The entire system uses this alternating work and automatic cleaning mechanism to ensure that the equipment continues to dissipate heat efficiently while maintaining a good dust-proof effect.

[0047] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A voltage transformer for a ring main unit, characterized in that: include: The device body (1) is provided with a terminal board (11) and a dust cover (12) on the top of the device body (1), a screw rod (15) is rotatably installed on the inner side of the dust cover (12) and a guide rod (14) is fixed thereto, the screw rod (15) is threadedly connected to a convex block on the side of the fan (13), and the guide rod (14) is slidably connected to a convex block on the other side of the fan (13), a motor (16) for driving the screw rod (15) to rotate is installed on one side of the dust cover (12), the top of the dust cover (12) is provided with an opening and two spliced ​​filter plates (17) are fitted and slidably fitted on the top end of the inner side, the filter plate (17) is concave in design and a cleaning assembly (2) is installed in the middle of the concave surface, the top of the dust cover (12) is provided with an air inlet, and the air inlet and the concave surface of the filter plate (17) have the same area; The cleaning assembly (2) comprises a hollow box (20) fixed in the middle of the concave surface of the filter plate (17), the filter surface is arranged on both sides of the hollow box (20), the inner wall of the hollow box (20) is fitted with a slider (213), the interior of the slider (213) is slidably mounted with a lifting block (21), both sides of the lifting block (21) are fixed with brush plates (22) passing through the slider (213) and the side opening of the hollow box (20), the brush plates (22) can move up and down in the two openings, the bottom of the slider (213) is fixed with a long strip (23), the long strip (23) passes through the bottom opening of the filter plate (17), and a notch on one side of the long strip (23) can be engaged with an L-shaped plate (24), and the two L-shaped plates (24) are respectively fixed on both sides of the top of the fan (13).

2. A voltage transformer for a ring main unit according to claim 1, characterized in that: A convex limiting block (25) is provided on one side of the long strip (23), and the convex limiting block (25) slides inside a slideway (26). The slideway (26) is fixed on one side of the dust cover (12). When the long strip (23) is engaged with the L-shaped plate (24), the convex limiting block (25) moves out of the slideway (26) and is located near one side thereof.

3. A voltage transformer for a ring main unit according to claim 1, characterized in that: A notch is provided at the corner of the upper end of the lifting block (21), and the notch also fits and slides inside the slider (213). An insert block (27) can be inserted into the inner wall of the notch. The insert block (27) slides in the inner opening of the slider (213). A spring (28) is connected to the inner side of the insert block (27). The bottom of the outer end of the insert block (27) is designed as an arc surface. A slope block (29) is provided on the top of the insert block (27). The slope block (29) slides in the cavity above the inner opening of the slider (213). A slope block (212) is fixed on the inner side of the hollow box (20). The slope block (212) can be inserted into the cavity from one side of the slider (213), and the slope of the slope block (212) can fit with the slope of the slope block (29).

4. A voltage transformer for a ring main unit according to claim 1, characterized in that: The top of the lifting block (21) and the top of the inner top of the slider (213) are connected with a spring 2 (210), the bottom corner of the lifting block (21) is designed as a slope, and the inner side of the hollow box (20) is installed with a slope block 3 (26) at the other end relative to the slope block 2 (212), and the slope block 3 (26) can be inserted from the opening on one side of the slider (213) to contact the slope of the bottom corner of the lifting block (21), so that the lifting block (21) rises and compresses the spring 2 (210).

5. A voltage transformer for a ring main unit according to claim 4, characterized in that: Two sponge sheets (211) are bonded to the inner sides of openings on both sides of the hollow box (20) through which the brush plates (22) pass.

6. A voltage transformer for a ring main unit according to claim 1, characterized in that: Two collecting boxes (19) are inserted into the opening on one side of the dust cover (12), and the two ends of the collecting boxes (19) are in contact with the inner wall of the dust cover (12). The filter plate (17) is U-shaped, that is, one end is an open end. The concave surface of the filter plate (17) faces the collecting box (19) and the end of the open end. The top of the collecting box (19) is in contact with the inner top surface of the dust cover (12), and a dust adsorption structure can be installed inside the collecting box (19). A low surface is provided at one end of the collecting box (19), and the low surface is in contact with the bottom of the filter plate (17).

7. A voltage transformer for a ring main unit according to claim 6, characterized in that: A baffle (110) is installed at the top end of the dust cover (12), and both sides of the baffle (110) are in contact with the side walls of the collection box (19). The baffle (110) can contact the open end of the filter plate (17), and the baffle (110) is located below the air inlet.

8. A voltage transformer for a ring main unit according to claim 7, characterized in that: A protective plate (18) is installed on the inner side of the air inlet at the top of the dust cover (12), and the protective plate (18) is used to protect the brush plate (22).

9. A voltage transformer for a ring main unit according to claim 7, characterized in that: The two joined side walls of the filter plates (17) are used to fix a sliding plate (111) together. A convex limiting plate on one side of the sliding plate (111) slides in a fixed slideway (113) on the inner side of the dust cover (12). The sliding plate (111) is threadedly connected to a second screw rod (112). The second rod (112) is rotatably mounted on the inner wall of the dust cover (12) and is driven to rotate by a second motor (114) mounted on the side wall of the dust cover (12).

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