Compression-resistant protective cover

Abstract

The pressure-resistant protective cover comprises a main body fixed at the bottom of an adsorption tower, and the main body is fixed at the bottom of the adsorption tower. A buffer top cover is arranged at one end, far away from the bottom of the adsorption tower, of the top of the main body, and a diffusion cover is arranged on the outer surface of the main body. A sealing plate is arranged at one end, close to the bottom of the adsorption tower, of the buffer top cover, so that an accommodating space is formed between the main body and the buffer top cover; and a buffer assembly and a diffusion driving assembly are arranged in the accommodating space and on the top plane of the main body. According to the pressure-resistant protective cover provided by the utility model, the top pressure is relieved by arranging the buffer assembly, and active coke particles around the protective cover are evacuated by arranging the evacuating rods, so that the received pressure is further relieved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a pressure-resistant protective cover. Background Technology

[0002] In deep wastewater treatment, the use of activated carbon for adsorption is becoming increasingly common. This requires pre-injecting activated carbon particles into the activated carbon filter, where an expander located at the bottom plays a crucial role in dispersing the activated carbon particles during injection. The expander needs to possess sufficient resistance to pressure and impact during both the injection of activated carbon particles and subsequent wastewater.

[0003] Therefore, the existing technology has problems and needs further improvement and development. Summary of the Invention

[0004] (I) Purpose of the invention: In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a pressure-resistant protective cover.

[0005] (II) Technical Solution: In order to solve the above-mentioned technical problems, this technical solution provides a pressure-resistant protective cover, including a main body fixed to the bottom of the adsorption tower. The main body is fixed to the bottom of the adsorption tower, and a buffer top cover is provided at the top of the main body away from the bottom of the adsorption tower. A diffusion cover is provided on the outer surface of the main body. A sealing plate connected to the outer wall of the main body is provided at the end of the buffer top cover near the bottom of the adsorption tower, so that an accommodating space is formed between the main body and the buffer top cover. A buffer component and a diffusion driving component are provided on the top plane of the main body inside the accommodating space.

[0006] Furthermore, the main body is a conical truncated shell that is narrower at the top and wider at the bottom. The top surface of the main body at the end away from the bottom of the adsorption tower is a closed structure. Fixing holes are continuously and evenly arranged on the bottom surface of the main body at the end near the bottom of the adsorption tower. The main body is fixed to the bottom of the adsorption tower through the fixing holes.

[0007] Furthermore, the buffer top cover is an arc-shaped spherical shell.

[0008] Furthermore, the sealing plate is composed of two parts: a first annular surface and a second annular surface. The outer diameter of the first annular surface is smaller than the inner diameter of the second annular surface. The outer diameter of the second annular surface is fixedly connected to the edge of the buffer top cover. There is an annular opening between the first annular surface and the second annular surface. The main body extends into the interior of the buffer top cover from the inner diameter of the first annular surface, and the diffuser extends into the interior of the buffer top cover from the annular opening.

[0009] Furthermore, the diffusion hood is a conical truncated shell that is narrow at the top and wide at the bottom. The top and bottom ends of the diffusion hood are open. An annular sealing plate is provided at one end of the diffusion hood near the bottom of the adsorption tower to seal the gap between the diffusion hood and the main body. The diffusion hood is fitted onto the outer conical surface of the main body. The inner wall of the diffusion hood does not contact the outer wall of the main body, and the diffusion hood can rotate back and forth.

[0010] Furthermore, evacuation rods are uniformly welded and fixed on the outer conical surface of the diffuser, and the evacuation rods are columnar protrusions.

[0011] Furthermore, the buffer assembly includes a buffer block, a first spring, a second spring, a bracket, a connecting rod, a buffer column, a connecting block, and a slider. The bracket is a rectangular bracket, including a first horizontal side, a second horizontal side, and a first vertical section. The bracket is fixed to the plane of the main body away from the bottom of the adsorption tower via the first vertical section. A first spring is provided at the middle position of each of the first horizontal sides. A second spring is vertically fixed at the intersection of the first horizontal side and the second horizontal side. Each end of the first spring has a hemispherical slider. The two ends of the slider are respectively connected to the connecting rod. One end of the connecting rod is connected to the first spring, and the other end is connected to the connecting block. The connecting block is connected to the buffer block via a pin. The buffer block is mechanically connected to the side of the buffer top cover near the main body.

[0012] Furthermore, an opening is provided at one end of the buffer block near the first spring, and the connecting block is connected to the opening by a pin; the buffer block is an arc-shaped block, and the curved surface of the buffer block on the side away from the bottom of the adsorption tower fits the curve of the buffer top cover.

[0013] Furthermore, the diffusion drive assembly includes a driven wheel, a drive wheel, a rotating arm, and a drive motor. The driven wheel is located at the center of the support on a plane horizontal to the bottom of the adsorption tower, and the drive wheel is perpendicular to and meshes with the driven wheel. The rotating arm includes a second vertical section, a first horizontal section, a second horizontal section, a third vertical section, and a bearing. The two ends of the second vertical section are respectively connected to the first horizontal section and the second horizontal section. The driven wheel is mounted on the side of the second vertical section closest to the first horizontal section, and the bearing is mounted on the side of the second vertical section closest to the second horizontal section. The first horizontal section is parallel to the plane formed by the first horizontal side and the second horizontal side, and the two ends of the first horizontal section away from the second vertical section are connected to the inner wall of the diffusion shroud.

[0014] Furthermore, both the driving wheel and the driven wheel are bevel gears.

[0015] (III) Beneficial effects: The present invention provides a pressure-resistant protective cover that relieves the pressure on the top by setting a buffer component, and further relieves the pressure by setting an evacuation rod to disperse the active coke particles around the protective cover. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a pressure-resistant protective cover according to the present invention;

[0017] Figure 2 This is a schematic diagram showing the structural positions of the buffer component and the diffusion driving component;

[0018] Figure 3 This is a structural diagram of the buffer top cover and the sealing plate;

[0019] Figure 4 This is a schematic diagram of the positional structure of the main body, diffuser, support, and rotating arm from a top-down view after the buffer top cover has been removed.

[0020] Figure 5 This is a schematic diagram of the external structure of the main body;

[0021] Figure 6 This is a schematic diagram of the diffuser structure after removing the columnar protrusions;

[0022] Figure 7 This is a schematic diagram of a gear.

[0023] Reference numerals: 1. Main body; 2. Buffer top cover; 3. Diffuser cover; 31. Evacuation rod; 4. Sealing plate; 41. Circular opening; 51. Buffer block; 52. First spring; 53. Second spring; 54. Bracket; 54. First horizontal side; 542. Second horizontal side; 543. First vertical section; 55. Connecting rod; 56. Buffer column; 57. Connecting block; 58. Slider; 6. Diffuser drive assembly; 61. Drive wheel; 62. Rotating arm; 63. Second vertical section; 631. First horizontal section; 632. Second horizontal section; 633. Third vertical section; 634. Bearing; 635. Drive motor; 64. Gear side surface; 65. Gear tooth; 66. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to preferred embodiments. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0025] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that these drawings are for illustrative purposes only and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0026] A pressure-resistant protective cover, such as Figure 1 As shown, the system includes a main body 1, a buffer top cover 2, and a diffusion hood 3. The main body 1 is fixed to the bottom of the adsorption tower. The buffer top cover 2 is located on the top of the main body 1, away from the bottom of the adsorption tower, and is used to buffer the impact force on the main body 1 during the injection and diffusion of activated carbon particles. The diffusion hood 3 is located on the outer conical surface of the main body 1 and diffuses the activated carbon particles accumulated on the outer conical surface of the main body 1, so that the activated carbon particles are evenly scattered at the bottom of the filter tank.

[0027] Specifically, such as Figure 5 As shown, the main body 1 is a conical truncated shell, narrower at the top and wider at the bottom. The top surface of the main body, away from the bottom of the adsorption tower, is a closed structure. On the plane of the main body 1 near the bottom of the adsorption tower, there are continuous and uniformly arranged fixing holes. The main body 1 is fixed to the bottom of the adsorption tower through these fixing holes. The fixing method of the main body 1 to the bottom of the adsorption tower can be welding or bolting, and no specific limitation is made here.

[0028] like Figure 3 As shown, the buffer cover 2 is an arc-shaped spherical shell. A sealing plate 4 connecting the outer wall of the main body is provided at one end of the buffer cover 2 near the bottom of the adsorption tower. The sealing plate 4 consists of two parts: a first annular surface and a second annular surface. The outer diameter of the first annular surface is smaller than the inner diameter of the second annular surface, and the outer diameter of the second annular surface is fixedly connected to the edge of the buffer cover 2. The main body 1 extends into the interior of the buffer cover 2 from the inner diameter of the first annular surface, and there is an annular opening 41 between the first annular surface and the second annular surface.

[0029] like Figure 6 As shown, the diffusion hood 3 is a conical truncated shell, narrow at the top and wide at the bottom, with openings at both ends. An annular sealing plate is provided at one end of the diffusion hood 3 near the bottom of the adsorption tower to seal the gap between the diffusion hood 3 and the main body 1. Evacuation rods 31, which are columnar protrusions, are uniformly welded and fixed to the outer conical surface of the diffusion hood 3. The diffusion hood 3 is fitted onto the outer conical surface of the main body 1, with its inner wall not contacting the outer wall of the main body 1, and the diffusion hood 3 is capable of reciprocating rotation.

[0030] Specifically, the buffer cover 2 adopts an arc-shaped spherical structure design, which makes the surface of the buffer cover 2 uniformly stressed, thereby providing buffer protection for the end of the main body 1 away from the bottom of the adsorption tower. The sealing plate 4 creates an accommodating space between the main body 1 and the buffer cover 2. Inside the accommodating space, the portion of the diffusion hood 3 extending into the buffer cover 2 is greater than the portion of the main body 1 extending into the buffer cover 2, but it does not come into contact with the inner wall of the buffer cover 2.

[0031] When the diffusion cover 3 is driven, the evacuation rod 31 disturbs the active coke particles around the diffusion cover 3, thereby dispersing the active coke particles to areas outside the pressure-resistant protective cover, thus reducing the pressure of the active coke particles on the pressure-resistant protective cover.

[0032] like Figure 2 As shown, the buffer assembly includes a buffer block 51, a first spring 52, a second spring 53, a bracket 54, a connecting rod 55, a buffer post 56, a connecting block 57, and a slider 58. Wherein, as... Figure 4 As shown, the bracket 54 is a rectangular bracket, comprising a first horizontal side 541, a second horizontal side 542, and a first vertical segment 543. Both the first horizontal side 541 and the second horizontal side 542 are slender cylinders. After the first horizontal side 541 intersects the second horizontal side 542, the first horizontal side 541 continues to extend away from its center at both ends, such that both first horizontal sides 541 slightly exceed the vertex where they intersect. However, the first horizontal side 541 does not contact the inner wall of the diffuser shroud 3. The first horizontal side 541 and the second horizontal side 542 are fixedly connected, and the connection method can be welding or screwing, which is not specifically limited here. At each of the four intersections of the first horizontal edge 541 and the second horizontal edge 542, there is a first vertical segment 543 perpendicular to the plane formed by the first horizontal edge 541 and the second horizontal edge 542. The first vertical segment 543 is located on the side of the support 54 away from the buffer top cover 2. One end of the first vertical segment 543 away from the bottom of the adsorption tower is fixed to the support 54, and the other end is fixedly connected to the plane of the main body 1 away from the bottom of the adsorption tower. This allows the support 54 to be fixed to the plane of the main body 1 away from the bottom of the adsorption tower via the first vertical segment 543. The fixing method can be welding or screw connection, and is not specifically limited here.

[0033] A first spring 52 is provided at the middle position of each of the first horizontal edges 541. The inner diameter of the first spring 52 is greater than or equal to the vertical cross-sectional diameter of the first horizontal edge 541, so that the first spring 52 can fit onto the first horizontal edge 541. A second spring 53 is vertically welded and fixed at the intersection of the first horizontal edge 541 and the second horizontal edge 542. A buffer post 56 is inserted into the second spring 53 at the end away from the bottom of the adsorption tower. The other end of the buffer post 56, away from the bottom of the adsorption tower, is fixedly connected to the buffer block 51. The side of the buffer block 51 away from the bottom of the adsorption tower is fixedly connected to the side of the buffer top cover 2 near the bottom of the adsorption tower. The end of the buffer block 51 near the first spring 52 has an opening, and the connecting block 57 is connected to the opening by a pin. The connecting block 57 can rotate at the opening without colliding with the buffer top cover 2. The connecting block 57 and the first spring 52 are connected by the connecting rod 55.

[0034] Specifically, each end of the first spring 52 has a hemispherical slider 58. Each slider 58 has a circular opening at the center of its vertical cross-section. The inner diameter of the circular opening is equal to the diameter of the vertical cross-section of the first horizontal side 541, and the inner wall of the circular opening is smooth, allowing the slider 58 to move along the first horizontal side 541. The diameter of the sphere of the slider 58 is greater than or equal to the outer diameter of the circular side surface of the first spring 52. The first spring 52 is connected to the slider 58 by welding, allowing the slider 58 to act as a support surface. The first spring 52 deforms. The spherical surface of the slider 58 has an opening at the end furthest from the bottom of the adsorption tower for the connecting rod 55 to connect to. The slider 58 is hinged to the connecting rod 55, allowing the connecting rod 55 to provide a thrust to the slider 58 that is inclined towards the bottom of the adsorption tower but gradually approaches parallel to it. The decomposed force of this thrust in the direction parallel to the bottom of the adsorption tower is transmitted to the first spring 52 through the slider 58, causing the first spring 52 to deform and generate elastic potential energy. One end of the connecting rod 55 is connected to the slider 58, and the other end is connected to the connecting block 57. The connection between the connecting rod 55 and the connecting block 57 is also a hinge connection. The buffer block 51 is mechanically connected to the side of the buffer top cover 2 closest to the main body 1, and the side of the buffer block 51 furthest from the buffer top cover 2 is mechanically connected to the buffer column 56. The buffer pillar 56 includes a first buffer pillar and a second buffer pillar, both cylindrical. One end of the first buffer pillar and one end of the second buffer pillar are fixedly connected. The end of the first buffer pillar away from the second buffer pillar is connected to the buffer block 51. The end of the second buffer pillar away from the first buffer pillar is placed inside the second spring 53. The diameter of the first buffer pillar is equal to the inner diameter of the second spring 53, and the first buffer pillar is fixedly connected to the second spring 53 by friction. The diameter of the second buffer pillar is smaller than the inner diameter of the second spring 53.

[0035] In this invention, there are two first springs 52, and preferably four buffer blocks 51, four second springs 53, four connecting rods 55, four buffer posts 56, and four connecting blocks 57.

[0036] When the buffer top cover 2 is subjected to an impact force, the second spring 53 is deformed by the pressure of the impact force, causing the buffer top cover 2 and the buffer block 51 to move towards the bottom of the adsorption tower. The connecting rod 55 moves downwards, causing the first spring 52 to be compressed and deformed, thus converting the impact force into the elastic potential energy of the second spring 53 and the first spring 52, thereby alleviating the impact force.

[0037] Specifically, the buffer block 51 is an arc-shaped block, and the curved surface of the buffer block 51 on the side away from the bottom of the adsorption tower fits into the curved surface of the buffer top cover 2. The material of the buffer block 51 is rubber or silicone, and there is no limitation on this. When the buffer top cover 2 is impacted, the buffer assembly can effectively mitigate the impact force.

[0038] The diffusion drive assembly 6 includes a driven wheel 61, a drive wheel 62, a rotating arm 63, and a drive motor 64. The driven wheel 61 is located at the center of the support 54 on the plane horizontal to the bottom of the adsorption tower. The drive wheel 62 is perpendicular to the driven wheel 61 and meshes with the driven wheel 61. The rotating arm 63 includes a second vertical section 631, a first horizontal section 632, a second horizontal section 633, a third vertical section 634, and a bearing 635. The two ends of the second vertical section 631 are respectively connected to the first horizontal section 632 and the second horizontal section 633. The driven wheel 61 is mounted on the side of the second vertical section 631 closest to the first horizontal section 632, and the bearing 635 is mounted on the side of the second vertical section 631 closest to the second horizontal section 633, allowing the second vertical section 631 to rotate along its axis. The first horizontal segment 632 is parallel to the plane formed by the first horizontal edge 541 and the second horizontal edge 542. The two ends of the first horizontal segment 632 away from the second vertical segment 631 are welded to the inner wall of the diffuser shroud 3. Figure 4 As shown. The horizontal segment 632 rotates under the drive of the driven wheel 61, thereby causing the diffuser shroud 3 to rotate on the outer conical surface of the main body 1. The horizontal segment 632 stops and rotates in the opposite direction every time it is about to contact the first vertical segment 543, without touching the first vertical segment 543. The third vertical segment 634 is parallel to the second vertical segment 631, and its two ends are respectively connected to the second horizontal segment 633 and the second horizontal edge 542. The drive motor 64 is fixed to the third vertical segment 634 and connected to the drive wheel 62 through a transmission shaft.

[0039] Specifically, both the driven wheel 61 and the driving wheel 62 are bevel gears, with the driven wheel 61 being a complete gear and the driving wheel 62 being an incomplete gear. For example... Figure 7 As shown, both the driven wheel 61 and the driving wheel 62 have teeth 66, which continuously and evenly cover the gear side surfaces 65 of the driven wheel 61 and the driving wheel 62. The tooth coverage ratio of the driven wheel 61 is 100%, while the tooth coverage ratio of the driving wheel 62 is N%. Specifically, N% can be any value between 25% and 100%, and is not specifically limited here.

[0040] Specifically, this utility model provides a preferred embodiment where the surface formed by the first horizontal edge 541 and the second horizontal edge 542 is a square surface. Both the driving wheel 62 and the driven wheel 61 are bevel gears, with the driven wheel 61 being a complete gear and the driving wheel 62 being an incomplete gear. Both the driven wheel 61 and the driving wheel 62 have teeth 66, which continuously and evenly cover the gear-side surfaces 65 of the driven wheel 61 and the driving wheel 62. The tooth coverage ratio of the driven wheel 61 is 100%, and the tooth coverage ratio of the driving wheel 62 is 25%. During initial operation of the drive motor 64, the meshing point of the driving wheel 62 and the driven wheel 61 is located at one edge of the tooth-covered area of ​​the driving wheel 62, so that the driving wheel 62 and the driven wheel 61 are just engaged. When the drive motor 64 initially operates, it first rotates 90° towards the side of the drive wheel 62 away from the meshing point and covered by the gear teeth 66. The drive wheel 62, driven by the motor 64, rotates 90° in the same direction. At this time, the driven wheel 61, driven by the drive wheel 62, rotates 90° in the opposite direction, causing the diffusion shroud 3 to rotate on the outer conical surface of the main body 1. This pushes the activated coke particles at the bottom of the adsorption tower, located outside the pressure-resistant protective cover, thus relieving the pressure on the protective cover. Afterward, the drive motor 64 rotates 90° again towards the initial meshing point position of the drive wheel, causing the drive wheel 62 to rotate 90° in the same direction. At this time, the driven wheel 61, driven by the drive wheel 62, rotates 90° in the opposite direction, causing the horizontal end 632 to rotate 90° in the opposite direction on a plane parallel to the top of the main body 1. This further causes the diffusion shroud 3 to rotate on the outer conical surface of the main body 1. Thus, the motor 64 rotates periodically clockwise and counterclockwise, driving the drive wheel 62 to rotate periodically clockwise and counterclockwise, and the driven wheel 61 and the horizontal end 632 to rotate counterclockwise and clockwise, thereby causing the diffusion cover 3 to reciprocate periodically on the main body 1, achieving the effect of pushing the activated coke particles at the bottom of the adsorption tower outside the pressure-resistant protective cover, thus relieving the pressure on the pressure-resistant protective cover.

[0041] This utility model provides a pressure-resistant protective cover. By setting a buffer component to buffer the impact force on the top of the main body 1, and by setting a diffusion component 6 to diffuse the activated carbon particles around the main body 1 to the area outside the pressure-resistant protective cover, the service life of the main body 1 is greatly extended, and the activated carbon particles during the water distribution process can be more evenly distributed at the bottom of the filter.

[0042] The above description illustrates preferred embodiments of the present invention and helps those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative and should not be construed as limiting the specific implementation of the present invention to these embodiments. For those skilled in the art, several simple deductions and modifications can be made without departing from the inventive concept, and all such modifications should be considered within the protection scope of the present invention.

Claims

1. A pressure-resistant protective cover, comprising a main body fixed to the bottom of an adsorption tower, characterized in that, The main body is fixed to the bottom of the adsorption tower. A buffer cover is provided at the top of the main body away from the bottom of the adsorption tower. A diffusion cover is provided on the outer surface of the main body. A sealing plate connected to the outer wall of the main body is provided at the end of the buffer cover near the bottom of the adsorption tower, so that an accommodating space is formed between the main body and the buffer cover. A buffer assembly and a diffusion driving assembly are provided on the top plane of the main body inside the accommodating space.

2. The pressure-resistant protective cover according to claim 1, characterized in that, The main body is a conical truncated shell that is narrower at the top and wider at the bottom. The top surface of the main body at the end away from the bottom of the adsorption tower is a closed structure. On the bottom surface of the main body at the end near the bottom of the adsorption tower, there are continuous and uniform fixing holes. The main body is fixed to the bottom of the adsorption tower through the fixing holes.

3. The pressure-resistant protective cover according to claim 1, characterized in that, The buffer top cover is an arc-shaped spherical shell.

4. The pressure-resistant protective cover according to claim 1, characterized in that, The sealing plate consists of two parts: a first annular surface and a second annular surface. The outer diameter of the first annular surface is smaller than the inner diameter of the second annular surface. The outer diameter of the second annular surface is fixedly connected to the edge of the buffer top cover. There is an annular opening between the first annular surface and the second annular surface. The main body extends into the interior of the buffer top cover from the inner diameter of the first annular surface, and the diffuser extends into the interior of the buffer top cover from the annular opening.

5. The pressure-resistant protective cover according to claim 1, characterized in that, The diffusion hood is a conical truncated shell that is narrow at the top and wide at the bottom. The top and bottom ends of the diffusion hood are open. An annular sealing plate is provided at one end of the diffusion hood near the bottom of the adsorption tower to seal the gap between the diffusion hood and the main body. The diffusion hood is fitted on the outer conical surface of the main body. The inner wall of the diffusion hood does not contact the outer wall of the main body, and the diffusion hood can rotate back and forth.

6. The pressure-resistant protective cover according to claim 1, characterized in that, Evacuation rods are uniformly welded and fixed on the outer conical surface of the diffuser, and the evacuation rods are columnar protrusions.

7. The pressure-resistant protective cover according to claim 1, characterized in that, The buffer assembly includes a buffer block, a first spring, a second spring, a bracket, a connecting rod, a buffer column, a connecting block, and a slider. The bracket is a rectangular bracket, including a first horizontal side, a second horizontal side, and a first vertical section. The bracket is fixed to the plane of the main body away from the bottom of the adsorption tower via the first vertical section. A first spring is provided at the middle position of the first horizontal side. A second spring is vertically fixed at the intersection of the first and second horizontal sides. Each end of the first spring has a hemispherical slider. The two ends of the slider are respectively connected to the connecting rod. One end of the connecting rod is connected to the first spring, and the other end is connected to the connecting block. The connecting block is connected to the buffer block by a pin. The buffer block is mechanically connected to the side of the buffer top cover near the main body.

8. The pressure-resistant protective cover according to claim 7, characterized in that, An opening is provided at one end of the buffer block near the first spring, and the connecting block is connected to the opening by a pin; the buffer block is an arc-shaped block, and the curved surface of the buffer block away from the bottom of the adsorption tower fits the curve of the buffer top cover.

9. The pressure-resistant protective cover according to claim 7, characterized in that, The diffusion drive assembly includes a driven wheel, a drive wheel, a rotating arm, and a drive motor. The driven wheel is located at the center of the support on a plane horizontal to the bottom of the adsorption tower, and the drive wheel is perpendicular to and meshes with the driven wheel. The rotating arm includes a second vertical section, a first horizontal section, a second horizontal section, a third vertical section, and a bearing. The two ends of the second vertical section are respectively connected to the first horizontal section and the second horizontal section. The driven wheel is mounted on the side of the second vertical section closest to the first horizontal section, and the bearing is mounted on the side of the second vertical section closest to the second horizontal section. The first horizontal section is parallel to the plane formed by the first horizontal side and the second horizontal side. The two ends of the first horizontal section away from the second vertical section are connected to the inner wall of the diffusion shroud.

10. A pressure-resistant protective cover according to claim 9, characterized in that, Both the driving wheel and the driven wheel are bevel gears.

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