Dust removal fans and high and low voltage switchgear with dust removal fans

Abstract

This invention discloses a dust removal fan and a high / low voltage switchgear with a dust removal fan. It includes a cabinet and a dust removal fan mounted on the cabinet. The dust removal fan includes an outer cylinder, an inner cylinder, a filter, a cleaning component, and a fan itself, with the fan located downstream of the filter. The cleaning component includes a turntable and a dust removal pipe. The upper end of the dust removal pipe communicates with a dust discharge channel on the side wall of the inner cylinder. The turntable rotates with the inner cylinder, and the outer side wall of the turntable is in contact with the inner side wall of the inner cylinder. The front face of the turntable facing the air inlet is inclined, allowing the turntable to have a first state of sealing the dust discharge channel and a second state of opening the dust discharge channel during rotation. A spiral cleaning strip is provided inside the inner cylinder. This invention provides a dust removal fan and a high / low voltage switchgear with a dust removal fan, which can automatically clean the filter while maintaining airflow, and also features a reliable structure and low failure rate.

Description

Technical Field

[0001] This invention relates to the technical field of switchgear, specifically to a dust removal fan and a high- and low-voltage switchgear equipped with a dust removal fan. Background Technology

[0002] High and low voltage switchgear is an important piece of equipment used in power supply and distribution systems. It is widely used in various power supply locations, such as residential areas, industrial and mining enterprises, construction sites, and substations. Reducing the impact of environmental dust on the electrical components inside the switchgear is a significant development direction in the switchgear industry.

[0003] Existing technologies already include dust removal and air intake systems for high and low voltage switchgear. For example, CN115021104A discloses an axial flow cleaning device for high and low voltage switchgear, which can automatically and periodically clean the dust on the filter screen while maintaining unobstructed air intake. Specifically, a first drive structure drives a sealing plate to move axially, thereby opening or closing the cleaning channel. When the cleaning channel is open, rotating cleaning strips sweep the dust off the inner wall of the filter screen and collect it into the cleaning channel to complete the cleaning of the filter screen.

[0004] Based on the considerations of this existing technology, at least the following technical problems still exist in practical use:

[0005] 1) The sheet-like sealing plate is prone to bending and tilting during axial reciprocating motion. If it is too loose, it will easily leak air and fail to achieve the sealing effect. If it is too tight, it will easily jam and prevent the sealing plate from moving smoothly in the axial reciprocating motion. In particular, the sealing plate needs to frequently cross the upper port of the cleaning channel. If the sealing plate is deformed, it is easy to malfunction when it comes into contact with the edge of the upper port.

[0006] 2) Its suction component is located at the air inlet of the air duct. At this time, the air drawn into the air duct comes into direct contact with the suction component without being filtered. Therefore, the service life of the motor and blades in the suction component is short and the failure rate is high.

[0007] 3) The inner wall of the filter is cleaned by the rotation of the spiral cleaning strip. However, the spiral cleaning strip remains in contact with the inner wall of the filter even when it stops working. Obviously, the presence of the cleaning strip will block part of the filter, thereby reducing the ventilation efficiency of the filter. Summary of the Invention

[0008] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a dust removal fan and a high and low voltage switch cabinet with a dust removal fan, which can not only automatically clean the filter while maintaining air intake, but also has a reliable structure and a low failure rate.

[0009] Therefore, one object of the present invention is to provide a dust removal fan, comprising:

[0010] The outer cylinder has an air inlet and an air outlet;

[0011] The inner cylinder is fixed inside the outer cylinder, and together with the outer cylinder, they form an annular air passage. The side wall has a filter screen installation port that communicates with the annular air passage, and the rear end is sealed away from the air inlet.

[0012] A filter screen, covering the filter screen installation port;

[0013] A cleaning component, located inside the inner cylinder, is used to clean the inner wall of the filter screen;

[0014] The air inlet, the inner cavity of the inner cylinder, the filter installation port, the annular air passage, and the air outlet are connected in sequence to form the main air passage.

[0015] Its characteristic is that it further includes:

[0016] The fan is located inside the main air duct and downstream of the filter.

[0017] The cleaning assembly includes a turntable and a dust removal pipe. The upper end of the dust removal pipe is connected to a dust discharge channel near the rear end on the side wall of the inner cylinder, and the lower end of the dust removal pipe extends to the outside of the outer cylinder. The turntable is located inside the inner cylinder and rotates with the inner cylinder. The outer side wall of the turntable is in contact with the inner side wall of the inner cylinder. A drive motor for driving the turntable to rotate is provided outside the inner cylinder. The front end face of the turntable facing the air inlet is inclined so that the turntable has a first state of sealing the dust discharge channel and a second state of opening the dust discharge channel during rotation. A cleaning strip is provided inside the inner cylinder, which is in contact with the inner side wall of the inner cylinder and extends spirally along the axial direction. One end of the cleaning strip is fixed to the turntable, and the outer side of the cleaning strip has a brush head that contacts the inner side wall of the filter screen.

[0018] According to an example of the present invention, the upper edge of the dust discharge channel intersecting with the inner wall of the inner cylinder has an inner edge, which is parallel to the cross-section S of the inner cylinder. The inner edge has an outer edge on the side near the air inlet end. The proximal end of the outer edge along the rotation direction of the turntable is connected to the proximal end of the inner edge through a proximal side edge, and the distal end of the outer edge is connected to the distal end of the inner edge through a distal side edge. The vertical distance between the two ends of the proximal side edge is greater than the vertical distance between the two ends of the distal side edge, and the outer edge is arc-shaped.

[0019] According to one example of the invention, the inner cylinder is provided with a drive assembly for moving the other end of the cleaning strip axially, so that the cleaning strip contracts or expands axially.

[0020] According to an example of the present invention, the drive assembly includes a moving ring, a return spring, and a plurality of traction ropes. The moving ring is axially slidably engaged with the inner cylinder. The return spring is disposed inside the inner cylinder and its two ends abut against the moving ring and the turntable, respectively. The turntable has a mounting cavity on the side opposite to the air inlet end. One end of the traction rope is fixed to the moving ring, and the other end passes through the mounting cavity axially. A winder for winding the traction rope is provided in the mounting cavity, and the winder is fixedly connected to the turntable.

[0021] According to one example of the invention, the cleaning strip has holes through which a traction rope passes sequentially along the axial direction.

[0022] According to one embodiment of the invention, the moving ring includes a base ring and a rotating sub-ring rotatably fitted on the base ring, wherein the return spring and the cleaning strip are both connected to the rotating sub-ring.

[0023] According to one example of the present invention, the drive motor is a dual-shaft motor, the rear end of the inner cylinder has a base plate, the drive motor is fixedly installed on the side of the base plate away from the air inlet end, and the first shaft of the drive motor passes through the shaft hole in the base plate and is connected to the turntable. The fan includes fan blades, which are installed on the second shaft of the drive motor.

[0024] According to one example of the present invention, an air guide shroud is provided inside the inner cylinder, and the air guide shroud is fixed to the turntable.

[0025] According to one example of the present invention, the dust removal pipe is a flexible hose, the upper end of which is connected to the dust discharge channel on the inner cylinder side wall, and the lower end of which penetrates the outer cylinder to the outside of the outer cylinder or is connected to the dust discharge interface on the outer cylinder.

[0026] Therefore, one object of the present invention is to provide a high and low voltage switch cabinet, which includes a cabinet body, characterized in that: the above-mentioned dust removal fan is installed on the cabinet body, the air outlet of the dust removal fan is connected to the inner cavity of the cabinet body, and the air inlet is connected to the space outside the cabinet body.

[0027] The above technical solution has the following advantages or beneficial effects: First, the opening and closing of the dust removal channel is achieved by the rotation of the turntable. The turntable experiences little resistance during the opening and closing process, which is not likely to cause damage to the turntable. Second, the structural design of the upper edge of the dust removal channel ensures that the front end of the turntable has a good dust scraping effect and experiences little resistance when passing through the upper edge of the dust removal channel. Finally, the setting of the drive component allows the cleaning strip to be retracted and expanded.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1This is an isometric view of the dust removal fan of the present invention.

[0030] Figure 2 This is a bottom view of the dust removal fan of the present invention.

[0031] Figure 3 for Figure 2 A cross-sectional view along the "AA" direction with the cleaning strip in the unfolded position and the turntable in the first state.

[0032] Figure 4 yes Figure 3 A three-dimensional schematic diagram of the mid-section view.

[0033] Figure 5 for Figure 2 A cross-sectional view along the "AA" direction with the cleaning strip in the retracted position and the turntable in the first state.

[0034] Figure 6 yes Figure 5 A three-dimensional schematic diagram of the mid-section view.

[0035] Figure 7 for Figure 2 A cross-sectional view along the "AA" direction with the cleaning strip in the unfolded position and the turntable in the second state.

[0036] Figure 8 yes Figure 7 A magnified view of a portion of region "B".

[0037] Figure 9 This is an isometric view of the inner cylinder in this invention.

[0038] Figure 10 This is a schematic diagram of the internal structure of the inner cylinder in this invention, which is partially cut along the central axis.

[0039] Figure 11 This is a schematic diagram of the high and low voltage switchgear with a dust removal fan in this invention.

[0040] in,

[0041] 100. Cabinet;

[0042] 200. Dust removal fan;

[0043] 1. Outer cylinder; 1.1. Air inlet; 1.2. Air outlet; 2. Inner cylinder; 2.1. Filter installation port; 2.2. Base plate; 3. Annular air passage; 4. Filter; 5. Turntable; 5.1. Front end face; 6. Dust removal pipe; 7. Dust discharge channel; 7.1. Upper edge opening; 7.1.1. Inner edge; 7.1.2. Outer edge; 7.1.3. Near side edge; 7.1.4. Far side edge; 8. Drive motor; 8.1. First shaft; 8.2. Second shaft; 9. Cleaning strip; 9.1. Brush head; 9.2. Wire hole; 10. Moving ring; 10.1. Base ring; 10.2. Rotating sub-ring; 11. Return spring; 12. Traction rope; 13. Winding reel; 14. Mounting cavity; 15. Fan blade; 16. Air guide shroud; 17. First air guide ring; 18. Second air guide ring. Detailed Implementation

[0044] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0045] The dust removal fan and the high and low voltage switchgear with the dust removal fan according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] This invention provides a high and low voltage switchgear, as shown in the figure. It includes a cabinet 100, characterized in that: a dust removal fan 200 is installed on the cabinet 100 to blow air into the cabinet 100. The dust removal fan 200 has an air outlet 1.2 and an air inlet 1.1. The air inlet 1.1 is located inside the cabinet 100, while the air outlet 1.2 is exposed outside the cabinet 100. That is, the air outlet 1.2 of the dust removal fan 200 is connected to the inner cavity of the cabinet 100, and the air inlet 1.1 is connected to the space outside the cabinet 100.

[0047] The dust removal fan 200 can be as follows: Figure 11 It can be installed on the side wall of the cabinet 100, or it can be installed on the top of the cabinet 100.

[0048] Since the operating environment of high and low voltage switchgear generally contains a large amount of dust, in order to reduce the risk of short circuit damage to electrical components caused by dust entering the switchgear, this embodiment makes the following improvements to the structure of the dust removal fan 200 on the cabinet 100 to meet dust removal requirements:

[0049] This invention provides a dust removal fan, such as Figure 1-10 As shown, including:

[0050] The outer cylinder 1 has an air inlet end 1.1 and an air outlet end 1.2;

[0051] Inner cylinder 2, which is fixed inside outer cylinder 1, and the inner cylinder 2 and outer cylinder 1 together form an annular air passage 3. The side wall of the inner cylinder 2 has a filter screen installation port 2.1 that communicates with the annular air passage 3. The rear end of the inner cylinder 2 away from the air inlet end 1.1 is sealed.

[0052] Filter screen 4, which covers the filter screen installation port 2.1;

[0053] A cleaning component, located inside the inner cylinder 2, is used to clean the inner wall of the filter screen 4;

[0054] External air can enter the inner cavity of the inner cylinder 2 from the air inlet 1.1, and after being filtered by the filter 4 on the filter installation port 2.1, it enters the annular air passage 3 and is finally discharged from the air outlet 1.2. Thus, the air inlet 1.1, the inner cavity of the inner cylinder 2, the filter installation port 2.1, the annular air passage 3, and the air outlet 1.2 are sequentially connected to form the main air passage;

[0055] Its characteristic is that it further includes:

[0056] The fan is located inside the main air duct and downstream of filter 4;

[0057] The cleaning assembly includes a turntable 5 and a dust removal pipe 6. The upper end of the dust removal pipe 6 communicates with a dust discharge channel 7 near the rear end on the side wall of the inner cylinder 2, and the lower end of the dust removal pipe 6 extends to the outside of the outer cylinder 1. The turntable 5 is located inside the inner cylinder 2 and rotates in cooperation with the inner cylinder 2. The outer side wall of the turntable 5 is in contact with the inner side wall of the inner cylinder 2. A drive motor 8 for driving the turntable 5 to rotate is provided outside the inner cylinder 2. The front face 5.1 of the turntable 5 facing the air inlet 1.1 is inclined so that the turntable 5 alternately opens and closes the dust discharge channel 7 during rotation. Figure 3 and Figure 7As shown, the turntable 5 has a first state of sealing the dust discharge channel 7 and a second state of opening the dust discharge channel 7. The inner cylinder 2 is provided with a cleaning strip 9 that abuts against the inner wall of the inner cylinder 2 and extends spirally along the axial direction. One end of the cleaning strip 9 is fixed to the turntable 5, and the outer side of the cleaning strip 9 has a brush head 9.1 that contacts the inner wall of the filter screen 4. At this time, the drive motor 8 drives the turntable 5 to rotate, causing the turntable to alternately be in the first and second states. Simultaneously, the turntable 5 also drives the cleaning strip 9 to rotate. Since the cleaning strip 9 is spiral-shaped, the rotating cleaning strip 9 can not only sweep off the dust adsorbed on the inner wall of the filter screen 4 but also move the swept dust towards the position of the turntable, ultimately discharging it from the alternately opened dust discharge channel 7. In this embodiment, since the opening and closing of the dust discharge channel 7 is achieved by the rotation of the turntable, the turntable receives a circumferential rotational force during rotation, while its axial pushing force is relatively small. Therefore, the turntable should not be subjected to axial force and bend or deform. In addition, the front face 5.1 of the turntable is set at an angle and rotates with the turntable. Therefore, the edge of the front face 5.1 scrapes the dust discharge channel 7 at an angle. That is, the edge of the front face 5.1 and the upper edge 7.1 of the dust discharge channel 7 form an angled shearing force. At this time, even if there is a lot of dust at the upper edge 7.1 of the dust discharge channel 7, its resistance to the turntable 5 is small.

[0058] The downstream position of the filter 4 mentioned above refers to the position that the air must pass through in the direction of airflow in the main air duct, starting from the location of the filter.

[0059] Based on the preferred embodiments described above, such as Figure 10As shown, the upper edge 7.1 of the dust exhaust channel 7 has an inner edge 7.1.1, which is parallel to the cross-section S of the inner cylinder 2. An outer edge 7.1.2 is provided on the side of the inner edge 7.1.1 near the air inlet 1.1. The proximal end of the outer edge 7.1.2 along the rotation direction of the turntable 5 is connected to the proximal end of the inner edge 7.1.1 via a proximal side edge 7.1.3, and the distal end of the outer edge 7.1.2 is connected to the distal end of the inner edge 7.1.1 via a distal side edge 7.1.4. The vertical distance between the two ends of the proximal side edge 7.1.3 is greater than the vertical distance between the two ends of the distal side edge 7.1.4. The outer edge 7.1.2 is curved. The inner edge 7.1.1, proximal side edge 7.1.3, outer edge 7.1.2, and distal side edge 7.1.4 are connected end-to-end in sequence to form the upper edge 7.1. The upper edge opening 7.1 of this embodiment allows the turntable 5 to first contact the wider near side 7.1.3 during rotation, and then, as it moves towards the far side 7.1.4, the front end face 5.1 of the turntable 5 forms an angle with both the inner side 7.1.1 and the outer side 7.1.2, performing a shearing motion until it disengages from the upper edge opening 7.1 at the far side 7.1.4 and blocks the upper edge opening 7.1 of the dust discharge channel 7 through the outer wall of the turntable 5. During this process, the turntable 5 can more smoothly scrape the deposited dust into the dust discharge channel 7, while the resistance experienced by the turntable 5 is small, resulting in a good dust removal effect.

[0060] Because the spiral-shaped cleaning strip 9, driven by the turntable 5, can clean the inner wall of the filter screen 4 and drive the swept dust to converge at the location of the dust discharge channel 7, the presence of the cleaning strip 9 is necessary for cleaning the filter screen. The more rotations of the cleaning strip 9, the better the cleaning effect per rotation. However, when cleaning the filter screen is not required, the presence of the cleaning strip 9 will inevitably obstruct part of the filter screen area, thereby reducing the effective area of ​​the filter screen and affecting ventilation efficiency. In this case, the fewer rotations of the cleaning strip 9, the less impact it has on obstructing the filter screen 4. Therefore, the improvement in this embodiment is that the inner cylinder 2 is provided with a drive assembly for moving the other end of the cleaning strip 9 axially, so that the cleaning strip 9 retracts or expands axially. When the filter 4 needs to be cleaned, the drive component can be used to drive the filter 4 to unfold, so that the turntable can rotate the filter 4 to complete the cleaning work; conversely, the drive component can drive the cleaning strip 9 to retract, so that the cleaning strip 9 avoids the area where the filter is located, thus allowing the filter 4 to maintain the best ventilation effect.

[0061] Based on the preferred example of the drive assembly described above, specifically, the drive assembly includes a moving ring 10, a return spring 11, and several traction ropes 12. The moving ring 10 is axially slidably engaged with the inner cylinder 2. The return spring 11 is disposed inside the inner cylinder 2 and its two ends abut against the moving ring 10 and the turntable 5, respectively. The turntable 5 has a mounting cavity 14 on the side opposite to the air inlet end 1.1. One end of the traction rope 12 is fixed to the moving ring 10, and the other end passes axially into the mounting cavity 14. The mounting cavity 14 is provided with a winder 13 for winding the traction rope 12, and the winder 13 is fixedly connected to the turntable 5. The winder 13 is a general term for a device that can be fixed to one end of a rope to wind or unwind the rope; it is also called a coiler, winding device, reel, drum, etc. This winder 13 is an existing conventional mechanism, so its structure will not be described in detail. In this embodiment, the winder 13 is preferably an electric winder.

[0062] Preferably, the cleaning strip 9 has holes 9.2 for the traction rope 12 to pass through, and the traction rope 12 passes through each hole 9.2 sequentially along the axial direction.

[0063] like Figure 8 As shown, the moving ring 10 includes a base ring 10.1 and a rotating sub-ring 10.2 rotatably fitted on the base ring 10.1. The return spring 11 and the cleaning strip 9 are both connected to the rotating sub-ring 10.2. In this case, the base ring 10.1 does not need to rotate with the turntable, thus allowing it to move axially back and forth only under the combined force of the traction rope 12 and the return spring 11. Therefore, a clearance fit or a sliding fit can be used between the base ring 10.1 and the inner wall of the inner cylinder 2.

[0064] like Figure 3 As shown, since the fan is located downstream of the filter, the rotation of the fan blades 15 requires an additional fan motor. Similarly, the rotation of the turntable 5 also requires a drive motor 8. To reduce the number of motors, in this embodiment, the drive motor 8 is preferably a dual-axis motor, meaning a motor with two output shafts. The rear end of the inner cylinder 2 has a base plate 2.2. The drive motor 8 is fixedly mounted on the side of the base plate 2.2 away from the air inlet end 1.1. The first shaft 8.1 of the drive motor 8 passes through a shaft hole on the base plate 2.2 and connects to the turntable 5. The fan includes fan blades 15, which are mounted on the second shaft 8.2 of the drive motor 8. Therefore, only one drive motor 8 is needed to drive the turntable 5 and the fan blades 15, reducing the number of motors and saving costs.

[0065] Of course, since the fan blades 15 rotate at a relatively high speed while the turntable rotates at a relatively slow speed, if a single motor is used to drive both the fan blades 15 and the turntable 5 simultaneously, a speed-changing gear set needs to be added between the turntable 5 and the second shaft 8.2 to reduce the rotation speed of the turntable 5.

[0066] In a preferred embodiment of the above, the inner cylinder 2 is provided with an air guide shroud 16, which is fixed to the turntable 5.

[0067] In a preferred embodiment of the above, the dust removal pipe 6 is a flexible hose, the upper end of which is connected to the dust discharge channel 7 on the side wall of the inner cylinder 2, and the lower end of which passes through the outer cylinder 1 to the outside of the outer cylinder 1 or is connected to the dust discharge interface on the outer cylinder 1.

[0068] In a preferred embodiment, the front end of the inner cylinder 2 and the air inlet 1.1 of the outer cylinder 1 are connected by a first air guide ring 17. A second air guide ring 18 is provided inside the annular air passage 3, which allows the radial airflow passing through the filter to be smoothly redirected to flow axially along the annular air passage 3, thereby reducing wind resistance.

[0069] It should be noted that in the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0075] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. A dust removal fan, comprising: The outer cylinder (1) has an air inlet (1.1) and an air outlet (1.2); The inner cylinder (2) is fixed inside the outer cylinder (1) and forms an annular air passage (3) with the outer cylinder (1). The side wall has a filter installation port (2.1) that communicates with the annular air passage (3) and a rear end seal away from the air inlet end (1.1). A filter screen (4) is placed over the filter screen mounting port (2.1); A cleaning component, located inside the inner cylinder (2), is used to clean the inner wall of the filter screen (4); The air inlet (1.1), the inner cavity of the inner cylinder (2), the filter installation port (2.1), the annular air passage (3) and the air outlet (1.2) are connected in sequence to form the main air passage; Its characteristic is that it further includes: The fan is located in the main air duct and downstream of the filter (4); The cleaning assembly includes a turntable (5) and a dust removal pipe (6). The upper end of the dust removal pipe (6) is connected to a dust discharge channel (7) near the rear end on the side wall of the inner cylinder (2), and the lower end of the dust removal pipe (6) extends to the outside of the outer cylinder (1). The turntable (5) is located inside the inner cylinder (2) and rotates with it. The outer side wall of the turntable (5) is in contact with the inner side wall of the inner cylinder (2). A drive motor (8) for driving the turntable (5) to rotate is provided outside the inner cylinder (2). The turntable (5) faces... The front end face (5.1) of the air inlet (1.1) is inclined so that the turntable (5) has a first state of sealing the dust discharge channel (7) and a second state of opening the dust discharge channel (7) during rotation. The inner cylinder (2) is provided with a cleaning strip (9) that abuts against the inner wall of the inner cylinder (2) and extends in a spiral shape along the axial direction. One end of the cleaning strip (9) is fixed to the turntable (5). The outer side of the cleaning strip (9) has a brush head (9.1) that contacts the inner wall of the filter screen (4). The inner cylinder (2) is provided with a drive assembly for moving the other end of the cleaning strip (9) axially, so that the cleaning strip (9) retracts or expands axially. The drive assembly includes a moving ring (10), a return spring (11), and several traction ropes (12). The moving ring (10) slides axially with the inner cylinder (2). The return spring (11) is located inside the inner cylinder (2) and its two ends abut against the moving ring (10) and the turntable (5), respectively. The turntable (5) has a mounting cavity (14) on the side away from the air inlet end (1.1). One end of the traction rope (12) is fixed to the moving ring (10), and the other end passes through the mounting cavity (14) axially. The mounting cavity (14) is provided with a winder (13) for winding the traction rope (12), and the winder (13) is fixedly connected to the turntable (5).

2. The dust removal fan according to claim 1, characterized in that: The upper edge (7.1) of the dust discharge channel (7) has an inner edge (7.1.1), which is parallel to the cross-section S of the inner cylinder (2). The inner edge (7.1.1) has an outer edge (7.1.2) on the side near the air inlet (1.1). The proximal end of the outer edge (7.1.2) along the rotation direction of the turntable (5) is connected to the proximal end of the inner edge (7.1.1) through a proximal side edge (7.1.3). The distal end of the outer edge (7.1.2) is connected to the distal end of the inner edge (7.1.1) through a distal side edge (7.1.4). The vertical distance between the two ends of the proximal side edge (7.1.3) is greater than the vertical distance between the two ends of the distal side edge (7.1.4). The outer edge (7.1.2) is arc-shaped.

3. The dust removal fan according to claim 1, characterized in that: The cleaning strip (9) has wire holes (9.2) for the traction rope (12) to pass through, and the traction rope (12) passes through each wire hole (9.2) sequentially along the axial direction.

4. The dust removal fan (200) according to claim 1, characterized in that: The moving ring (10) includes a base ring (10.1) and a rotating sub-ring (10.2) rotatably fitted on the base ring (10.1). The reset spring (11) and the cleaning strip (9) are both connected to the rotating sub-ring (10.2).

5. The dust removal fan according to claim 1, characterized in that: The drive motor (8) is a dual-axis motor. The rear end of the inner cylinder (2) has a base plate (2.2). The drive motor (8) is fixedly installed on the side of the base plate (2.2) away from the air inlet end (1.1). The first shaft (8.1) of the drive motor (8) passes through the shaft hole on the base plate (2.2) and is connected to the turntable (5). The fan includes fan blades (15), which are installed on the second shaft (8.2) of the drive motor (8).

6. The dust removal fan according to claim 1, characterized in that: The inner cylinder (2) is provided with an air guide hood (16), which is fixed to the turntable (5).

7. The dust removal fan according to claim 1, characterized in that: The dust removal pipe (6) is a flexible hose. The upper end of the dust removal pipe (6) is connected to the dust discharge channel (7) on the side wall of the inner cylinder (2). The lower end of the dust removal pipe (6) passes through the outer cylinder (1) to the outside of the outer cylinder (1) or is connected to the dust discharge interface on the outer cylinder (1).

8. A high- and low-voltage switchgear, comprising a cabinet (100), characterized in that: The cabinet (100) is equipped with a dust removal fan (200) as described in any one of claims 1-7. The air outlet (1.2) of the dust removal fan (200) is connected to the inner cavity of the cabinet (100), and the air inlet (1.1) is connected to the space outside the cabinet (100).

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