A protective cover special-shaped rubber plate and a rainproof installation structure using the same

Abstract

This utility model relates to the field of outdoor power equipment protection, specifically a protective cover with a shaped rubber sheet and a rainproof installation structure using it. The protective cover with a shaped rubber sheet includes an annular umbrella skirt structure and a card fitting that connects the openings of the annular umbrella skirt; both the annular umbrella skirt structure and the card fitting are made of elastic insulating plate-like material; when the upper and lower umbrella skirts of the annular umbrella skirt structure are unfolded, the cross-section is V-shaped; the rainproof installation structure includes: a column structure, an installation ring assembly, a support member, and the protective cover with a shaped rubber sheet; the outer wall of the upper end of the installation ring assembly has a horizontally inwardly recessed annular groove; the bottom of the installation ring assembly has a horizontally outwardly extending support member; it is easy to install onto the outer surface of the column, and the outwardly extending skirt structure forms a stable rainproof structure. The protective cover with a shaped rubber sheet has a simple structure, lower production and usage costs, and the rainproof installation structure can more stably and quickly install the protective cover with a shaped rubber sheet onto the outer surface of the column, providing excellent rain protection for electrical equipment.

Description

Technical Field

[0001] This utility model relates to the field of protection for outdoor power equipment, and in particular to a protective cover with an irregularly shaped rubber sheet and a rainproof installation structure using the same. Background Technology

[0002] Power supply facilities are typically installed outdoors, such as substations and transformers. These power facilities are often equipped with disconnect switches, controllers, monitoring devices, and other related equipment. These devices require excellent rain protection; otherwise, they are prone to water seepage, short circuits, and damage.

[0003] Current technology often protects these devices by enclosing them in an insulated, sealed enclosure. This involves several challenges: firstly, the devices need to be installed inside the enclosure before being connected to external power sources, making installation and operation complex; secondly, such enclosures are difficult to replace if damaged, and their production and usage costs are also higher. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to propose a protective cover with an irregularly shaped rubber plate. The protective cover with an irregularly shaped rubber plate is made of elastic insulating material and can achieve a certain range of twisting under external force, making it easy to install on the outer surface of the column. Its outward-extending skirt structure forms a stable rainproof structure and can also provide good rain protection for electrical devices installed below. The production and use costs are also lower.

[0005] Another objective of this invention is to propose a rainproof installation structure that allows the protective cover's irregularly shaped rubber sheet to be installed more stably and quickly on the outer surface of the column, while also improving the waterproof effect.

[0006] To achieve this objective, the present invention adopts the following technical solution: A protective cover with an irregularly shaped plastic panel includes an annular umbrella skirt structure with an opening and a card component for splicing the opening of the annular umbrella skirt; both the annular umbrella skirt structure and the card component are made of an elastic insulating plate-like material; the annular umbrella skirt structure is divided into an upper umbrella skirt and a lower umbrella skirt stacked on top of each other, with the outer edges of the upper umbrella skirt and the outer edges of the lower umbrella skirt connected as a single structure; the inner edges of the upper umbrella skirt and the inner edges of the lower umbrella skirt are not connected, forming an open structure; the inner edge of the upper umbrella skirt has an annular connecting edge towards the central circular hollow area of ​​the annular umbrella skirt structure, so that when the upper and lower umbrella skirts of the annular umbrella skirt structure are unfolded, the cross-section is V-shaped, and the annular connecting edge is used to connect and fix to the column structure in the horizontal direction.

[0007] Preferably, the two ends of the upper umbrella skirt are provided with connecting portions extending relative to each other, and the connecting portions are located inside the opening; the connecting portions are provided with through holes; the card piece has the same shape as the opening structure of the upper umbrella skirt, and the bottom surface of the card piece is provided with a protruding engaging portion; the card piece covers the upper surface of the two connecting portions, the protruding engaging portion is engaged into the through hole, and the card piece splices the upper umbrella skirt into a complete ring-shaped whole.

[0008] Preferably, the inner edge of the card is provided with an arc-shaped connecting edge, and when the card is closed with the upper surface of the two connecting parts, the arc-shaped connecting edge and the annular connecting edge are spliced ​​together to form a circular connecting edge.

[0009] Preferably, when the upper and lower umbrella skirts of the annular umbrella skirt structure are unfolded, the lower umbrella skirt is horizontally positioned, and the angle between the upper umbrella skirt and the horizontal plane is 15-30 degrees; the bottom of the lower umbrella skirt is provided with a support and locking part.

[0010] A rainproof installation structure includes: a column structure, an installation ring assembly, a support member, and the aforementioned protective cover shaped rubber plate; the upper outer wall of the installation ring assembly is horizontally recessed inward with an annular groove; the bottom of the installation ring assembly extends horizontally outward with the support member; the installation ring assembly is sleeved and fixed to the outer wall of the column structure, the circular connecting part of the upper umbrella skirt of the protective cover shaped rubber plate is completely inserted into the annular groove, and the lower umbrella skirt is supported and installed above the support member.

[0011] Preferably, the mounting ring assembly includes a left semicircular ring, a right semicircular ring, and a connecting bolt; the left semicircular ring and the right semicircular ring are symmetrical to each other, and a connecting lug is provided at the splicing position of the left semicircular ring and the right semicircular ring, and the connecting lug is provided with a connecting screw hole; the connecting bolt passes through the connecting screw holes provided in the two opposite connecting lugs in sequence to splice the left semicircular ring and the right semicircular ring into a circular mounting ring assembly.

[0012] Preferably, when the upper and lower umbrella skirts of the annular umbrella skirt structure are unfolded, in the vertical projection direction, the annular projection width of the upper umbrella skirt is larger than the annular projection width of the lower umbrella skirt, and the difference between the two is equal to the width of the circular connecting edge.

[0013] Preferably, the outer wall of the lower end of the mounting ring assembly is provided with at least three support screw holes horizontally outward along the radial direction of the mounting ring assembly; the support member is a metal rod, the connecting end of the metal rod is provided with external thread, the connecting end of the metal rod is screwed into the support screw hole, and the support end of the metal rod is engaged and fixed with the support engagement part of the lower umbrella skirt.

[0014] Preferably, the metal rod is inclined upward, and the metal rod consists of metal segments at both ends and a strip-shaped spring segment connecting the two metal segments.

[0015] Preferably, the top surface of the annular groove is recessed upwards and provided with an arc-shaped guide groove. The arc-shaped guide groove is provided with several glue injection holes vertically upwards, and the glue injection holes connect the arc-shaped guide groove to the outside. When the protective cover irregular-shaped rubber plate is installed to the mounting ring assembly, the circular connecting part is inserted into the annular groove, and the arc-shaped guide groove is filled with a waterproof adhesive layer.

[0016] The beneficial effects of the embodiments of this utility model are as follows: The protective cover's irregularly shaped rubber sheet is made of an elastic insulating plate-like material, specifically high-temperature vulcanized silicone rubber support. It possesses moderate hardness and flexibility, good flame-retardant and insulating properties, and is suitable for environments with high pollution, high salt spray, rainfall, and icing. The protective cover's irregularly shaped rubber sheet has a V-shaped cross-section and a certain degree of elasticity, allowing the upper and lower umbrella skirts to fold together during transportation and storage, saving space and facilitating transport and storage. During installation, the elasticity of the protective cover's irregularly shaped rubber sheet can be utilized to twist and stagger it, creating a larger opening, making it easier to fit onto the outside of the column structure. After installation, the protective cover unfolds into a three-dimensional structure, resulting in higher stability. The annular connecting edge can be directly and tightly fixed to the surface of the column structure, or it can be indirectly fixed using other fixing structures. With the protective cover's irregularly shaped rubber sheet installed on the column structure, it provides excellent rain protection for the electrical devices on the column structure, and is easy to install and has lower operating costs.

[0017] In the rainproof installation structure, the protective cover shaped rubber plate is installed to the outer wall of the column structure through the mounting ring assembly. The mounting ring assembly can be tightly fitted onto the outer wall of the column structure. When the protective cover shaped rubber plate is spliced ​​by the card piece, the inner side of the upper umbrella skirt is inserted into the annular slot, and the upper umbrella skirt is limited in the annular slot. The lower umbrella skirt is supported by the support member. The installation and replacement of the protective cover shaped rubber plate is convenient. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the annular umbrella skirt structure described in one embodiment of the present invention; Figure 2 This is an exploded structural diagram of the shaped adhesive plate of the protective cover described in one embodiment of this utility model; Figure 3 This is a three-dimensional structural diagram of the rainproof installation structure described in one embodiment of the present utility model; Figure 4 yes Figure 3 A three-dimensional structural schematic diagram of the rainproof installation structure described in the illustrated embodiment from another perspective; Figure 5 yes Figure 3 An exploded view of the rainproof installation structure shown in the embodiment; Figure 6 This is a schematic diagram of the cross-sectional structure of the left or right semicircular ring in one embodiment of this utility model.

[0019] Among them: 10 of the protective cover irregular rubber plate, 11 of the annular umbrella skirt structure, 111 of the upper umbrella skirt, 112 of the lower umbrella skirt, 113 of the annular connecting edge, 114 of the connecting part, 115 of the through hole, 12 of the card piece, 121 of the protruding engaging part, 122 of the arc-shaped connecting part, 116 of the support engaging part, 20 of the mounting ring assembly, 21 of the connecting bolt, 210 of the annular slot, 220 of the support piece, 230 of the support screw hole, 221 of the metal section, 222 of the strip spring section, 240 of the arc-shaped guide groove, 241 of the glue injection hole; 30 of the column structure. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] One embodiment of this application, such as Figures 1 to 2 As shown, a protective cover with an irregularly shaped plastic plate 10 is characterized by comprising an annular umbrella skirt structure 11 with an opening and a card piece 12 for splicing the opening of the annular umbrella skirt; both the annular umbrella skirt structure 11 and the card piece 12 are made of elastic insulating plate-like material; the annular umbrella skirt structure 11 is divided into an upper umbrella skirt 111 and a lower umbrella skirt 112 stacked on top of each other, the outer edges of the upper umbrella skirt 111 and the outer edges of the lower umbrella skirt 112 are connected to form an integral structure; the inner edges of the upper umbrella skirt 111 and the inner edges of the lower umbrella skirt 112 are not connected, forming an open structure; the inner edge of the upper umbrella skirt 111 is provided with an annular connecting edge 113 towards the central circular hollow area of ​​the annular umbrella skirt structure 11, so that when the upper umbrella skirt 111 and the lower umbrella skirt 112 of the annular umbrella skirt structure 11 are unfolded, the cross-section is V-shaped, and the annular connecting edge 113 is used to connect and fix to the column structure 30 in the horizontal direction.

[0022] The protective cover's irregularly shaped rubber plate is made of an elastic insulating plate-like material, specifically a high-temperature vulcanized silicone rubber support. It possesses moderate hardness and flexibility, good flame-retardant and insulating properties, and is suitable for environments with high pollution, high salt spray, rainfall, and icing. The protective cover's irregularly shaped rubber plate has a V-shaped cross-section and a certain degree of elasticity, allowing the upper and lower umbrella skirts 111 and 112 to fold together during transportation and storage, saving space and facilitating transport and storage. During installation, the elasticity of the protective cover's irregularly shaped rubber plate 10 can be utilized to twist and stagger it to form a larger opening, making it easier to fit the protective cover's irregularly shaped rubber plate 10 onto the outside of the column structure 30. After installation, the protective cover's irregularly shaped rubber plate 10 unfolds into a three-dimensional structure, resulting in higher stability of the installation structure. The annular connecting edge 113 can be directly and tightly fixed to the surface of the column structure 30, or it can be indirectly installed and fixed by adding other fixing structures. After the column structure 30 is equipped with the protective cover shaped rubber plate 10, it can provide a high rainproof effect for the electrical devices on the column structure 30, and it is easy to install and has a lower cost of use.

[0023] Preferably, the upper umbrella skirt 111 has connecting portions extending opposite to each other at both ends, and the connecting portions are located within the opening; the connecting portions have through holes 115; the card piece 12 has the same shape as the opening structure of the upper umbrella skirt 111, and the bottom surface of the card piece 12 has a protruding engaging portion 121; the card piece 12 covers the upper surfaces of the two connecting portions, and the protruding engaging portion 121 engages with the through hole 115, and the card piece 12 splices the upper umbrella skirt 111 into a complete ring. The card piece 12 can stably splice the ring-shaped umbrella skirt structure 11 into a complete ring structure, and also facilitates the installation and disassembly of the protective cover irregular plate.

[0024] Preferably, the inner edge of the card piece 12 is provided with an arc-shaped connecting edge 122. When the card piece 12 is closed with the upper surfaces of the two connecting parts, the arc-shaped connecting edge 122 and the annular connecting edge 113 are spliced ​​together to form a circular connecting edge. The complete circular connecting edge allows the protective cover's irregularly shaped rubber plate 10 to be installed more stably, allows the inner side of the upper umbrella skirt 111 to fit more fully with the outer wall of the column structure 30, and can also play a more comprehensive role in guiding rainwater left above the column structure 30.

[0025] Preferably, when the upper umbrella skirt 111 and the lower umbrella skirt 112 of the annular umbrella skirt structure 11 are unfolded, the lower umbrella skirt 112 is horizontally positioned, and the angle between the upper umbrella skirt 111 and the horizontal plane is 15-30 degrees; the bottom of the lower umbrella skirt 112 is provided with a support and engagement part 116.

[0026] One embodiment of this application, such as Figures 3 to 6As shown, a rainproof installation structure includes: a column structure 30, an installation ring assembly 20, a support member 220, and a protective cover shaped rubber plate 10; the upper outer wall of the installation ring assembly 20 is horizontally recessed inward with an annular groove 210; the bottom of the installation ring assembly 20 extends horizontally outward with the support member 220; the installation ring assembly 20 is sleeved and fixed to the outer wall of the column structure 30, and the circular connecting part of the upper umbrella skirt 111 of the protective cover shaped rubber plate 10 is completely inserted into the annular groove 210, and the lower umbrella skirt 112 is supported and installed above the support member 220. During installation, first, the annular connecting edge 113 of the upper umbrella skirt is inserted into the annular groove 210, and then the arc-shaped connecting edge of the card member is also inserted into the annular groove from the opening, and then the card member is engaged and fixed with the two connecting parts.

[0027] The protective cover shaped rubber plate 10 is installed to the outer wall of the column structure 30 through the mounting ring assembly 20. The mounting ring assembly 20 can be tightly fitted onto the outer wall of the column structure 30. When the protective cover shaped plate is spliced ​​by the card piece 12, the inner side of the upper umbrella skirt 111 is inserted into the annular slot 210, and the upper umbrella skirt 111 is limited in the annular slot 210. The lower umbrella skirt 112 is supported by the support member 220. The installation and replacement of the protective cover shaped rubber plate 10 is convenient.

[0028] Preferably, the mounting ring assembly 20 includes a left semicircular ring, a right semicircular ring, and connecting bolts 21. The left and right semicircular rings are symmetrically arranged, and a connecting lug is provided at the joint of the left and right semicircular rings, with a connecting screw hole in the connecting lug. The connecting bolts 21 pass sequentially through the connecting screw holes in the two opposite connecting lugs to join the left and right semicircular rings into a circular mounting ring assembly 20. The mounting ring assembly 20 does not employ a one-piece structure but rather a symmetrically joined structure, further expanding the application scenarios of the rainproof mounting structure.

[0029] Preferably, when the upper umbrella skirt 111 and lower umbrella skirt 112 of the annular umbrella skirt structure 11 are unfolded, in the vertical projection direction, the annular projection width of the upper umbrella skirt 111 is larger than the annular projection width of the lower umbrella skirt 112, and the difference between the two is equal to the width of the circular connecting edge. This width setting ensures that when the annular connecting edge 113 of the upper umbrella skirt 111 is inserted into the annular slot 210, the inner edge of the lower umbrella skirt 112 is also horizontally attached to and supported on the outer wall of the mounting ring assembly 20, further ensuring the stability of the structure.

[0030] Preferably, the lower end of the mounting ring assembly 20 has at least three support screw holes 230 extending horizontally outward along the radial direction of the mounting ring assembly 20; the support member 220 is a metal rod, the connecting end of the metal rod has an external thread, the connecting end of the metal rod is screwed into the support screw hole 230, and the supporting end of the metal rod is engaged and fixed with the support engagement part 116 of the lower umbrella skirt 112. Specifically, the support engagement part has a strip-shaped groove along the radial direction of the mounting ring assembly, and the metal rod is engaged in the strip-shaped groove, making the installation and disassembly of the support member 220 more convenient.

[0031] Preferably, the metal rod is inclined upwards and consists of metal segments 221 at both ends and a strip-shaped spring segment 222 connecting the two metal segments 221. The protective cover's irregularly shaped rubber plate 10 tends to sag under gravity. The support member 220, inclined upwards and equipped with a spring segment, stabilizes the installation structure of the lower umbrella skirt 112 under the combined effects of gravity and the elastic restoring force of the strip-shaped spring segment 222. The left and right semi-circular rings can be made of non-metallic materials as needed, but the connecting bolts 21 are generally metal. The hollow space formed between the upper umbrella skirt 111 and the lower umbrella skirt 112 can cover most of the mounting ring assembly 20, further preventing structural corrosion from rain.

[0032] Preferably, the top surface of the annular groove 210 is recessed with an arc-shaped flow guide groove 240, and the arc-shaped flow guide groove 240 is vertically provided with a plurality of glue injection holes 241, which connect the arc-shaped flow guide groove 240 to the outside. When the protective cover shaped rubber plate is installed to the mounting ring assembly, the circular connecting part is inserted into the annular groove 210, and the arc-shaped flow guide groove 240 is filled with a waterproof adhesive layer. According to the installation environment requirements of the rainproof installation structure, in order to further improve the stability of the installation structure, glue can be filled into the arc-shaped flow guide groove 240 according to waterproof or structural requirements. After the glue cures, a waterproof adhesive layer is obtained, which can further enhance the firmness and sealing of the connection structure between the upper umbrella skirt 111 and the annular groove 210. When it is necessary to replace the protective cover shaped rubber plate, it is only necessary to use a blade to cut open the waterproof adhesive layer along the top of the annular groove 210, take out the upper umbrella skirt, and then scrape off the glue residue in the backflow groove.

[0033] It should be noted that the column structure 30 can be a structure installed on top of the electrical device that needs to be protected, or it can be a support column structure for installing power facilities, such as a utility pole for supporting the erection of a transformer. Therefore, the dimensions and specifications of the mounting ring assembly 20 and the protective cover irregular rubber plate 10 can be designed and manufactured according to common scenarios, and can be selectively installed according to the specific installation scenario.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A protective cover with an irregularly shaped rubber sheet, characterized in that, It includes an annular umbrella skirt structure with an opening and a card component that splices the opening of the annular umbrella skirt; both the annular umbrella skirt structure and the card component are made of an elastic insulating plate-like material; The annular umbrella skirt structure is divided into an upper umbrella skirt and a lower umbrella skirt stacked on top of each other. The outer edges of the upper umbrella skirt and the outer edges of the lower umbrella skirt are connected to form an integral structure. The inner edges of the upper umbrella skirt and the inner edges of the lower umbrella skirt are not connected, forming an open structure. The inner edge of the upper umbrella skirt is provided with an annular connecting edge towards the central circular hollow area of ​​the annular umbrella skirt structure, so that when the upper and lower umbrella skirts of the annular umbrella skirt structure are unfolded, the cross-section is V-shaped. The annular connecting edge is used to connect and fix to the column structure in the horizontal direction.

2. The protective cover with irregularly shaped rubber sheet according to claim 1, characterized in that, The upper umbrella skirt has connecting portions extending from both ends, which are located within the opening. The connecting portions have through holes. The card piece has the same shape as the opening structure of the upper umbrella skirt, and the bottom surface of the card piece has a protruding engaging portion. The card piece covers the upper surfaces of the two connecting portions, and the protruding engaging portion engages with the through hole. The card piece splices the upper umbrella skirt into a complete ring-shaped whole.

3. The protective cover with irregularly shaped rubber sheet according to claim 2, characterized in that, The inner edge of the card is provided with an arc-shaped connecting edge. When the card is closed with the upper surface of the two connecting parts, the arc-shaped connecting edge and the annular connecting edge are spliced ​​together to form a circular connecting edge.

4. The protective cover with irregularly shaped rubber sheet according to claim 3, characterized in that, When the upper and lower umbrella skirts of the annular umbrella structure are unfolded, the lower umbrella skirt is horizontally positioned, and the angle between the upper umbrella skirt and the horizontal plane is 15-30 degrees; the bottom of the lower umbrella skirt is provided with a support and locking part.

5. A rainproof installation structure, characterized in that, include: The column structure, mounting ring assembly, support components, and the protective cover irregularly shaped rubber plate as described in claim 4; The upper outer wall of the mounting ring assembly is horizontally recessed inward to provide an annular groove; the bottom of the mounting ring assembly extends horizontally outward to provide the support member; The mounting ring assembly is sleeved and fixed on the outer wall of the column structure, the circular connecting part of the upper umbrella skirt of the protective cover shaped rubber plate is completely inserted into the annular groove, and the lower umbrella skirt is supported and installed above the support member.

6. The rainproof installation structure according to claim 5, characterized in that, The mounting ring assembly includes a left semicircular ring, a right semicircular ring, and connecting bolts; the left semicircular ring and the right semicircular ring are symmetrical to each other, and a connecting lug is provided at the splicing position of the left semicircular ring and the right semicircular ring, and the connecting lug is provided with a connecting screw hole; the connecting bolt passes through the connecting screw holes provided in the two opposite connecting lugs in sequence to splice the left semicircular ring and the right semicircular ring into a circular mounting ring assembly.

7. The rainproof installation structure according to claim 5, characterized in that, When the upper and lower umbrella skirts of the annular umbrella structure are unfolded, in the vertical projection direction, the annular projection width of the upper umbrella skirt is larger than that of the lower umbrella skirt, and the difference between the two is equal to the width of the circular connecting edge.

8. The rainproof installation structure according to claim 5, characterized in that, The lower end of the mounting ring assembly has at least three support screw holes horizontally outward along the radial direction of the mounting ring assembly; the support member is a metal rod, the connecting end of the metal rod is provided with external thread, the connecting end of the metal rod is installed in the support screw holes, and the support end of the metal rod is engaged and fixed with the support engagement part of the lower umbrella skirt.

9. A rainproof installation structure according to claim 8, characterized in that, The metal rod is inclined upward and consists of metal segments at both ends and a strip-shaped spring segment connecting the two metal segments.

10. A rainproof installation structure according to claim 5, characterized in that, The top surface of the annular groove is recessed with an arc-shaped flow guide groove, and the arc-shaped flow guide groove is vertically upward with a number of glue injection holes, which connect the arc-shaped flow guide groove to the outside. When the protective cover irregular-shaped rubber plate is installed to the mounting ring assembly, the circular connecting part is inserted into the annular groove, and the arc-shaped flow guide groove is filled with a waterproof adhesive layer.

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