A transformer with external protection

Abstract

This invention relates to the field of transformer outer layer protection technology, and discloses a transformer with outer layer protection, including a main body and a transformer, with a storage space inside the main body. Based on the characteristics of hot and cold airflow, this invention allows the hot air generated during transformer operation to rise, while the cooler external air entering the main body sinks. This creates a situation similar to natural convection of water flowing from high to low, enabling the openings inside the main body to diffuse downwards, exchange with the hot air, and evenly cover the interior of the main body. This reduces the accumulation of hot air during prolonged transformer operation, thereby rapidly lowering the temperature of the gas inside the main body and improving heat dissipation efficiency during operation.

Description

Technical Field

[0001] This invention relates to the field of transformer outer layer protection technology, specifically to a transformer with outer layer protection. Background Technology

[0002] The main functions of a transformer are current transformation, voltage transformation, and impedance transformation. Transformers are fundamental equipment for power transmission and distribution, and are widely used in transportation, agriculture, industry, and urban communities. Transformers are mainly classified into distribution transformers, power transformers, and fully sealed transformers. In the smart grid industry, transformers require external protection. When protecting dry-type transformers, a protective box is usually installed on the outside of the transformer to achieve the purpose of protection. Since transformers generate a lot of heat during long-term use, cooling fans are usually installed on the inner wall of the protective box for heat dissipation. However, because the heat generated by the transformer during operation is high and tends to accumulate inside the protective box, it is difficult to effectively dissipate heat through fans. Furthermore, hot air tends to accumulate heat when it rises, affecting the transformer's heat dissipation efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a transformer with an outer protective layer to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: The present invention is a transformer with an outer protective layer, comprising a main body and a transformer, wherein the main body has an internal storage space and further comprises; A heat dissipation mechanism is installed inside the storage space to dissipate heat from the transformer. The auxiliary mechanism is installed inside the heat dissipation mechanism and is used to filter dust in the gas.

[0005] The storage space is provided with curved frames on the left and right sides. Short grooves are provided on the front and back of the curved frames. A rectangular groove is provided at the bottom of the curved frames. Inclined blocks are fixedly connected to the inner walls of the front and back of the curved frames. The curved frame has a square groove on the side near the inclined block, and an inclined plate is fixedly connected inside the curved frame.

[0006] Furthermore, the main body includes a temperature sensor fixedly connected to the inner wall of the back of the main body, and the main body includes: The component is installed inside the storage space; A rotating assembly is mounted on the side wall of the main body; A connecting component is installed on the top outer wall of the connecting component.

[0007] Furthermore, the heat dissipation mechanism includes: The pull assembly is installed inside the curved frame via an elastic element. A connecting component is installed on the outer wall of the curved frame.

[0008] Furthermore, the auxiliary mechanism includes an intermediate shaft disposed inside the rectangular groove, and the auxiliary mechanism includes: The transmission assembly is mounted on the side wall of the intermediate shaft; A limiting component is rotatably mounted on the outer surface of the intermediate shaft. Cleaning component, the cleaning component is installed on the side wall of the limit component.

[0009] Furthermore, the actuating component includes two electric actuators fixedly connected to the inner wall of the back of the main body. A rectangular plate is fixedly connected to the output end of the electric actuator, and spring rods are fixedly connected to the four corners of the rectangular plate on the side away from the electric actuator. Several spring rods are fixedly connected to the inner wall of the main body on the side away from the rectangular plate.

[0010] Furthermore, the rotating assembly includes a fan fixedly connected to the left and right sides of the main body, and a stepped block is fixedly connected to the side of the fan near the transformer. Fan 2 is fixedly connected to both the left and right sides of the main body.

[0011] Furthermore, the connecting assembly includes a connecting plate rotatably connected to the top of the rectangular plate, the side of the connecting plate away from the rectangular plate being rotatably connected to the bottom of the curved frame; The connecting plate has a limit rod on its side wall. The limit rod is rotatably connected inside the main body, and the outer surface of the limit rod is fixedly connected to the bending frame.

[0012] Furthermore, the elastic element includes a spring plate fixedly connected to the inner wall of the curved frame on the side near the transformer, and an arc-shaped block fixedly connected to the side of the spring plate away from the transformer. The pulling assembly includes a long rod fixedly connected to the top of the spring plate, with both the front and back of the long rod extending to the outside of the short groove, and a long plate rotatably connected to the extended end of the long rod. The connecting component includes a sliding block that is slidably connected to the front and back of the curved frame. The side of the sliding block near the long plate is rotatably connected to the side wall of the long plate, and a C-shaped groove is provided on the side of the sliding block near the curved frame.

[0013] Furthermore, the transmission assembly includes a transmission rod rotatably connected to the side of the long plate near the curved frame, with a short shaft rotatably connected to the end of the transmission rod away from the long plate; The short shaft and the transmission rod are eccentrically arranged, and the short shaft is rotatably connected to the side wall of the curved frame. The intermediate shaft is rotatably connected between the two short shafts.

[0014] Furthermore, the limiting assembly includes several limiting ears fixedly connected to the outer surface of the intermediate shaft, and a filter plate is rotatably connected inside the limiting ears. The filter plate has long grooves on both the front and back sides. Several bending springs are fixedly connected to the left side of the filter plate, and the ends of the bending springs away from the long groove are fixedly connected to the intermediate shaft. The cleaning assembly includes a sliding strip that is slidably connected inside two long slots. A connecting rod is rotatably connected to the end of the sliding strip near the bending spring. The end of the connecting rod away from the filter plate is rotatably connected to the side wall of the limiting ear.

[0015] The present invention has the following beneficial effects: 1. This invention, by driving the component to rotate, utilizes the characteristics of hot and cold airflow. The hot air generated during transformer operation rises, while cooler external air entering the main body sinks. This creates a natural convection similar to water flowing from high to low, allowing the openings inside the main body to diffuse downwards, exchanging heat with the gas and evenly covering the interior. This reduces the accumulation of hot gas during prolonged transformer operation, rapidly lowering the internal gas temperature and improving heat dissipation efficiency.

[0016] 2. In this invention, a transverse jet airflow is formed by spraying air outwards from the C-shaped groove towards the outlet of the curved frame through the rotating component and the connecting component. When the airflow flows through the C-shaped groove, it collides with the airflow flowing out of the curved frame. At this time, the transverse airflow and the main airflow flowing out of the outlet of the curved frame are over-dispersed at the top of the transformer, so that the cooler air entering from the outside can be more evenly diffused into the main body. At the same time, the dispersion of the airflow can also reduce the impact of the rising flow of hot air on the external airflow when the external gas flows into the main body quickly through the curved frame due to the excessive flow speed. This can further enhance the heat dissipation efficiency of the transformer surface.

[0017] 3. In this invention, through the pulling component and the limiting component, the gas flowing through the curved frame is guided by the inclined plate to pass through the filter plate and flow out. At this time, when the gas flows through the filter plate, the filter plate can filter the dust in the gas that enters with the outside, thereby reducing the situation where dust covers the transformer surface when the gas enters for a long time. Subsequently, when the connecting component rotates to the bottom of the inclined plate, the inclined plate will block the side wall of the filter plate. At this time, when the filter plate continues to rotate with the intermediate shaft, the filter plate will rotate on the surface of the intermediate shaft. At this time, the sliding strip can push and clean the dust accumulated on the surface of the filter plate when the filter plate rotates, thereby reducing the situation where dust covers the transformer surface when the gas enters, reducing the impact of dust on the heat dissipation of the transformer surface, and thus improving the heat dissipation efficiency of the transformer during operation.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the main body of the invention; Figure 4 This is a schematic diagram of the fan structure of the present invention; Figure 5 This is a schematic diagram of the connection components of the present invention; Figure 6 This is a partial cross-sectional schematic diagram of the heat dissipation mechanism of the present invention; Figure 7 This is a schematic diagram of the pull component of the present invention; Figure 8 This is a schematic diagram of the transmission component of the present invention; Figure 9 This is a schematic diagram of the limiting component of the present invention.

[0021] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 101. Temperature sensor; 11. Pushing assembly; 111. Electric push rod; 112. Rectangular plate; 113. Spring rod; 12. Rotating assembly; 121. Fan 1; 122. Fan 2; 13. Connecting assembly; 131. Connecting plate; 132. Limiting rod; 2. Heat dissipation mechanism; 201. Bending frame; 202. Inclined block; 203. Inclined plate; 204. Square groove; 21. Pulling assembly; 211. 212. Spring plate; 213. Arc block; 214. Long plate; 215. Long rod; 22. Connecting component; 221. Sliding block; 222. C-groove; 3. Auxiliary mechanism; 301. Intermediate shaft; 31. Transmission component; 311. Transmission rod; 312. Short shaft; 32. Limiting component; 321. Limiting ear; 322. Filter plate; 323. Long groove; 33. Cleaning component; 331. Sliding bar; 332. Connecting rod; 4. Transformer. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-9 As shown, the present invention is a transformer with an outer protective layer, including a main body 1 and a transformer 4. The main body 1 has a storage space inside and also includes; Heat dissipation mechanism 2 is installed inside the storage space and is used to dissipate heat from the transformer 4. Auxiliary mechanism 3 is installed inside the heat dissipation mechanism 2 and is used to filter dust in the gas.

[0024] A curved frame 201 is provided on both the left and right sides of the storage space. Short grooves are provided on the front and back of the curved frame 201. A rectangular groove is provided at the bottom of the curved frame 201. Inclined blocks 202 are fixedly connected to the inner walls of the front and back of the curved frame 201. Among them, a square groove 204 is provided on the side of the bending frame 201 near the inclined block 202, and an inclined plate 203 is fixedly connected inside the bending frame 201. At this time, the extracted gas will flow quickly to the top of the main body 1 through the small opening of the bending frame 201 by the rotation of the fan 121. According to the characteristics of hot and cold air, the hot air generated when the transformer 4 is working will rise.

[0025] The main body 1 includes a temperature sensor 101 fixedly connected to the inner wall of the back side of the main body 1. The main body 1 includes: Drive component 11, which is installed inside the storage space; Rotating assembly 12 is mounted on the side wall of the main body 1; Connection component 13 is installed on the top outer wall of connection component 13.

[0026] Heat dissipation mechanism 2 includes: Pull-out component 21 is installed inside the bending frame 201 via an elastic element; Connecting component 22 is installed on the outer wall of the curved frame 201.

[0027] The auxiliary mechanism 3 includes an intermediate shaft 301 disposed inside the rectangular groove. The auxiliary mechanism 3 includes: Transmission assembly 31 is mounted on the side wall of intermediate shaft 301; Limiting component 32 is rotatably mounted on the outer surface of intermediate shaft 301; Cleaning component 33 is installed on the side wall of limit component 32.

[0028] The pushing assembly 11 includes two electric push rods 111 fixedly connected to the inner wall of the back of the main body 1. A rectangular plate 112 is fixedly connected to the output end of the electric push rod 111. Spring rods 113 are fixedly connected to the four corners of the side of the rectangular plate 112 away from the electric push rod 111. Among them, several spring rods 113 are fixedly connected to the inner wall of the main body 1 on the side away from the rectangular plate 112. The temperature sensor 101 controls the electric push rod 111 and the fan 121 to work. When the electric push rod 111 is working, it pushes the rectangular plate 112 to slide.

[0029] The rotating assembly 12 includes a fan 121 fixedly connected to the left and right sides of the main body 1, and a step block is fixedly connected to the side of the fan 121 near the transformer 4. Fan 122 is fixedly connected to both the left and right sides of the main body 1. When the rectangular plate 112 slides, it will push the bending frame 201 through the connecting plate 131 to drive the limiting rod 132 to rotate upward.

[0030] The connecting assembly 13 includes a connecting plate 131 rotatably connected to the top of the rectangular plate 112, and the side of the connecting plate 131 away from the rectangular plate 112 is rotatably connected to the bottom of the curved frame 201. The connecting plate 131 has a limit rod 132 on its side wall. The limit rod 132 is rotatably connected to the inside of the main body 1, and the outer surface of the limit rod 132 is fixedly connected to the bending frame 201.

[0031] The elastic element includes a spring plate 211 fixedly connected to the inner wall of the curved frame 201 near the transformer 4, and an arc-shaped block 212 fixedly connected to the side of the spring plate 211 away from the transformer 4. The pulling assembly 21 includes a long rod 214 fixedly connected to the top of the spring plate 211. Both the front and back sides of the long rod 214 extend to the outside of the short groove, and the extended ends of the long rod 214 are rotatably connected to the long plate 213. The connecting component 22 includes a sliding block 221 that is slidably connected to the front and back of the curved frame 201. The side of the sliding block 221 near the long plate 213 is rotatably connected to the side wall of the long plate 213. A C-shaped groove 222 is provided on the side of the sliding block 221 near the curved frame 201. When the fan 121 is rotating rapidly, the rotation of the fan 121 will cause the spring plate 211 to slide back and forth through the contact between the stepped block and the arc block 212. When the spring plate 211 is sliding, it can drive the long plate 213 to slide in the short groove through the long rod 214.

[0032] The transmission assembly 31 includes a transmission rod 311 rotatably connected to the side of the long plate 213 near the curved frame 201, and a short shaft 312 rotatably connected to the end of the transmission rod 311 away from the long plate 213. Among them, the short shaft 312 and the transmission rod 311 are eccentrically arranged, and the short shaft 312 is rotatably connected to the side wall of the curved frame 201; The intermediate shaft 301 is rotatably connected between two short shafts 312. The sliding of the long plate 213 can drive the short shafts 312 to rotate through the transmission rod 311. When the short shafts 312 rotate, they will drive several filter plates 322 to rotate synchronously in the rectangular groove through the intermediate shaft 301.

[0033] The limiting component 32 includes several limiting ears 321 fixedly connected to the outer surface of the intermediate shaft 301. A filter plate 322 is rotatably connected inside the limiting ears 321. The filter plate 322 has long grooves 323 on both the front and back sides. Several bending springs are fixedly connected to the left side of the filter plate 322, and the ends of the bending springs away from the long groove 323 are fixedly connected to the intermediate shaft 301. The cleaning component 33 includes a sliding bar 331 slidably connected inside two elongated slots 323. A connecting rod 332 is rotatably connected to the end of the sliding bar 331 near the bending spring. The end of the connecting rod 332 away from the filter plate 322 is rotatably connected to the side wall of the limiting ear 321. The inclined plate 203 will block the side wall of the filter plate 322. At this time, as the filter plate 322 continues to rotate with the intermediate shaft 301, the filter plate 322 will rotate on the surface of the intermediate shaft 301. At this time, the sliding bar 331 can push and clean the dust accumulated on the surface of the filter plate 322 when the filter plate 322 rotates.

[0034] When in use, first place the transformer 4 inside the main body 1, then start the fans 122 on both sides of the main body 1. At this time, the rotation of the fans 122 will exhaust the hot air on the surface of the transformer 4 to achieve the purpose of protection and heat dissipation.

[0035] When temperature sensor 101 detects high temperature accumulation inside the main body 1, it controls electric actuator 111 and fan 121 to operate. Electric actuator 111 pushes rectangular plate 112 to slide. As rectangular plate 112 slides, it pushes bending frame 201 via connecting plate 131, causing limit rod 132 to rotate upwards. When bending frame 201 rotates, its air inlet covers fan 121. Then, as fan 121 rotates rapidly, it draws in external air. The drawn air is then drawn through the bending frame 201 by the rotation of fan 121. The air flows rapidly from the small opening at 01 towards the top of the main body 1. Based on the characteristics of hot and cold air, the hot air generated when the transformer 4 is working will rise, while the cooler air entering the main body 1 will sink. This creates a natural convection similar to water flowing from high to low, allowing the opening inside the main body 1 to diffuse downwards, exchange with the hot air, and evenly cover the interior of the main body 1. This reduces the accumulation of hot air during long-term operation of the transformer 4, thus rapidly lowering the gas temperature inside the main body 1 and improving heat dissipation efficiency during operation.

[0036] When fan 121 rotates rapidly, its rotation causes the spring plate 211 to slide back and forth through the contact between the stepped block and the arc-shaped block 212. As the spring plate 211 slides, it drives the long plate 213 to slide within the short groove via the long rod 214. The long plate 213, in turn, pushes the sliding block 221 to slide. The air inlet of this C-shaped groove 222 connects with the square groove 204. Simultaneously, when external gas flows rapidly into the main body 1 through the curved frame 201, some of the gas, blocked by the inclined plate 203, enters the C-shaped groove 222 through the square groove 204. The airflow is ejected from the C-shaped groove 222 towards the outlet of the curved frame 201, forming a transverse jet airflow. When the airflow flows through the C-shaped groove 222, it collides with the airflow flowing out of the curved frame 201. At this time, the transverse airflow and the main airflow flowing out of the outlet of the curved frame 201 collide and are dispersed at the top of the transformer 4, so that the cooler air entering from the outside can be more evenly diffused into the main body 1. At the same time, the dispersion of the airflow can also reduce the impact of the rising flow of hot air on the surface of the transformer 4 when the external gas flows into the main body 1 quickly through the curved frame 201 due to excessive flow velocity.

[0037] When the spring plate 211 drives the long plate 213 to slide back and forth, the sliding of the long plate 213 can drive the short shaft 312 to rotate through the transmission rod 311. When the short shaft 312 rotates, it will drive several filter plates 322 to rotate synchronously in the rectangular groove through the intermediate shaft 301. When the intermediate shaft 301 drives multiple filter plates 322 to rotate, the multiple filter plates 322 will rotate alternately inside the curved frame 201. When the filter plates 322 rotate inside the curved frame 201, the gas flowing through the curved frame 201 will be guided by the inclined plate 203 to pass through the filter plates 322 and flow out. At this time, when the gas flows through the filter plates 322, the filter plates 322 can filter the dust in the gas that enters with the outside. Filtration is performed to reduce the amount of dust that accumulates on the surface of transformer 4 when gas enters for an extended period. Subsequently, when the connecting component 22 rotates to the bottom of the inclined plate 203, the inclined plate 203 blocks the side wall of the filter plate 322. At this time, as the filter plate 322 continues to rotate with the intermediate shaft 301, the filter plate 322 will rotate on the surface of the intermediate shaft 301. At this time, the sliding bar 331 can push and clean the dust accumulated on the surface of the filter plate 322 when the filter plate 322 rotates, thereby reducing the amount of dust that accumulates on the surface of transformer 4 when gas enters, reducing the impact of dust on the heat dissipation of transformer 4, and thus improving the heat dissipation efficiency of transformer 4 during operation.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transformer with an outer protective layer, comprising a main body (1) and a transformer (4), wherein the main body (1) has a storage space inside, characterized in that, Also includes; Heat dissipation mechanism (2), which is installed inside the storage space for heat dissipation treatment of transformer (4); Auxiliary mechanism (3) is installed inside the heat dissipation mechanism (2) and is used to filter dust in the gas; The storage space is provided with curved frames (201) on the left and right sides. The curved frames (201) have short grooves on the front and back sides. The curved frames (201) have rectangular grooves at the bottom. Inclined blocks (202) are fixedly connected to the inner walls of the front and back sides of the curved frames (201). The curved frame (201) has a square groove (204) on the side near the inclined block (202), and an inclined plate (203) is fixedly connected inside the curved frame (201).

2. A transformer with outer protection according to claim 1, characterized in that: The main body (1) includes a temperature sensor (101) fixedly connected to the inner wall of the back side of the main body (1), and the main body (1) includes: A push assembly (11) is installed inside the storage space; Rotating assembly (12), which is mounted on the side wall of the main body (1); A connecting component (13) is mounted on the top outer wall of the connecting component (13).

3. A transformer with outer protection according to claim 2, characterized in that: The heat dissipation mechanism (2) includes: A pull assembly (21) is installed inside the curved frame (201) via an elastic element; A connecting component (22) is installed on the outer wall of the curved frame (201).

4. A transformer with outer protection according to claim 3, characterized in that: The auxiliary mechanism (3) includes an intermediate shaft (301) disposed inside a rectangular groove. The auxiliary mechanism (3) includes: A transmission assembly (31) is mounted on the side wall of the intermediate shaft (301); A limiting component (32) is rotatably mounted on the outer surface of the intermediate shaft (301); Cleaning component (33) is installed on the side wall of limiting component (32).

5. A transformer with outer protection according to claim 4, characterized in that: The pushing assembly (11) includes two electric push rods (111) fixedly connected to the inner wall of the back of the main body (1). A rectangular plate (112) is fixedly connected to the output end of the electric push rod (111). Spring rods (113) are fixedly connected to the four corners of the rectangular plate (112) on the side away from the electric push rod (111). Among them, several of the spring rods (113) are fixedly connected to the inner wall of the main body (1) on the side away from the rectangular plate (112).

6. A transformer with outer protection according to claim 5, characterized in that: The rotating assembly (12) includes a fan (121) fixedly connected to the left and right sides of the main body (1), and a step block is fixedly connected to the side of the fan (121) near the transformer (4); Fan 2 (122) is fixedly connected to both the left and right sides of the main body (1).

7. A transformer with outer protection according to claim 6, characterized in that: The connecting assembly (13) includes a connecting plate (131) rotatably connected to the top of the rectangular plate (112), and the side of the connecting plate (131) away from the rectangular plate (112) is rotatably connected to the bottom of the curved frame (201). The connecting plate (131) has a limiting rod (132) on its side wall. The limiting rod (132) is rotatably connected to the inside of the main body (1). The outer surface of the limiting rod (132) is fixedly connected to the bending frame (201).

8. A transformer with outer protection according to claim 7, characterized in that: The elastic element includes a spring plate (211) fixedly connected to the inner wall of the curved frame (201) near the transformer (4), and an arc-shaped block (212) fixedly connected to the side of the spring plate (211) away from the transformer (4). The pulling assembly (21) includes a long rod (214) fixedly connected to the top of the spring plate (211). The front and back sides of the long rod (214) extend to the outside of the short groove, and the extended ends of the long rod (214) are rotatably connected to a long plate (213). The connecting component (22) includes a sliding block (221) that is slidably connected to the front and back of the curved frame (201). The sliding block (221) is rotatably connected to the side wall of the long plate (213) on the side near the long plate (213). A C-shaped groove (222) is provided on the side of the sliding block (221) near the curved frame (201).

9. A transformer with outer protection according to claim 8, characterized in that: The transmission assembly (31) includes a transmission rod (311) rotatably connected to the side of the long plate (213) near the curved frame (201), and a short shaft (312) is rotatably connected to the end of the transmission rod (311) away from the long plate (213). The short shaft (312) is eccentrically positioned with respect to the transmission rod (311), and the short shaft (312) is rotatably connected to the side wall of the curved frame (201). The intermediate shaft (301) is rotatably connected between the two short shafts (312).

10. A transformer with outer protection according to claim 9, characterized in that: The limiting component (32) includes a plurality of limiting ears (321) fixedly connected to the outer surface of the intermediate shaft (301). A filter plate (322) is rotatably connected inside the limiting ears (321). The filter plate (322) has long grooves (323) on both the front and back sides. A plurality of bending springs are fixedly connected to the left side of the filter plate (322), and one end of the plurality of bending springs away from the long groove (323) is fixedly connected to the intermediate shaft (301). The cleaning assembly (33) includes a sliding bar (331) slidably connected inside the two elongated slots (323). The end of the sliding bar (331) near the bending spring is rotatably connected to a connecting rod (332). The end of the connecting rod (332) away from the filter plate (322) is rotatably connected to the side wall of the limiting ear (321).

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