Filter with corrosion-resistant cover plate

Abstract

The utility model discloses a filter with a corrosion-resistant cover plate, and belongs to the technical field of filters. The filter comprises a shell and a waterproof cover plate, a plurality of guide holes are formed in the lower end face of the waterproof cover plate, clamping grooves are formed in the guide holes, positioning holes integrally formed with the guide holes are formed in one sides of the guide holes, the positioning holes extend to be communicated with the clamping grooves, and the waterproof cover plate is fixed to the upper end face of the shell through elastic bolts. Lock holes corresponding to the guide holes are formed in the upper end face of the shell, one end of each elastic bolt penetrates through the corresponding positioning hole to be clamped in the corresponding clamping groove, and the other end of each elastic bolt is screwed into the corresponding lock hole. The elastic bolt comprises a guide head, a positioning column and a bolt body, and the guide head can be provided with a plurality of elastic grooves so that the guide head can be extruded to deform in the clamping groove. The waterproof cover plate is simple in structure and convenient to assemble and disassemble, reliable connection of the waterproof cover plate and the shell is achieved through cooperation of the elastic plug pins, the guide holes, the clamping grooves and the positioning holes, and the waterproof performance and the corrosion resistance of the filter are improved.

Description

Technical Field

[0001] This utility model relates to the field of filters, specifically to a cover plate anti-corrosion filter. Background Technology

[0002] With the rapid development of communication technology, filters, as key components in radio frequency communication systems, are crucial to the stable operation of the entire system due to their performance and reliability. In harsh environments, filters need to possess excellent waterproof and corrosion-resistant properties to ensure long-term stable operation. Currently, most filters on the market employ a housing and waterproof cover structure, achieving waterproof and dustproof functions through a tight connection between the cover and the housing.

[0003] In existing technologies, the installation methods for waterproof cover plates of filters mainly include screw fixing and snap-fit ​​connection. For example, Chinese Patent Publication No. CN212113970U discloses a 5G anti-interference filter with a quick-installation waterproof cover plate, which achieves rapid installation and removal of the cover plate through structures such as hook arms, locking hooks, and force-bearing blocks, eliminating the cumbersome nature of traditional technologies that require carrying a screwdriver for fixing. Chinese Patent Publication No. CN208015695U discloses a filter housing, including a housing body, a waterproof cover plate, an adjustment cover plate, and a sealing ring. The sealing ring is limited by the outer wall of the adjustment cover plate, and the waterproof function is achieved by the housing body and the waterproof cover plate pressing the sealing ring.

[0004] Furthermore, Chinese Patent Publication No. CN218387455U discloses a 5G filter cover structure, which improves the sealing and dustproof effect between the filter and the cover through the cooperation of a slide, a slide groove, and a fixing frame, as well as the setting of a first tension spring. Chinese Patent Publication No. CN222168658U discloses a filter with a cover pressing structure, which, through the setting of a positioning mechanism including a positioning rod, a positioning hole, a pressure plate, and a threaded rod, facilitates the positioning of the cover and pressure plate before fixing the cover, enabling rapid installation. Chinese Patent Publication No. CN113613417B discloses a millimeter-wave filter whose outer shell includes a housing, a top plate, and a cover plate, achieving the advantages of convenient assembly and disassembly and easy maintenance through the cooperation of grooves, slide grooves, and bolts.

[0005] However, existing filter cover mounting structures still have some technical problems: First, conventional waterproof covers mostly use external screws for installation. The screws generate rotational force and pressure during tightening, which can easily damage the cover's coating, affecting its corrosion resistance and leading to corrosion test failure. Second, after assembly, the cover mounting steps and locking screws are exposed, affecting the overall aesthetics of the product and posing a long-term risk of external corrosion, thus impacting product lifespan and increasing maintenance costs. Although the existing technologies offer some improvements, they still fail to effectively solve the problems of damage to the coating during cover installation and the corrosion risk of exposed components.

[0006] Therefore, there is an urgent need for a new type of cover plate anti-corrosion filter structure that can effectively protect the cover plate coating while ensuring waterproof performance, improve product aesthetics and service life, and reduce maintenance costs. Utility Model Content

[0007] The technical problem this utility model aims to solve is to address the defects of conventional waterproof cover installation methods using external screws in the prior art. For example, the rotational force and pressure generated during screw tightening may damage the coating of the cover, affecting the corrosion effect and causing corrosion test failure; after assembly, the cover installation steps and locking screws are exposed to the outside, affecting the product's appearance; and exposed parts are at risk of long-term external corrosion, affecting the product's service life and increasing later maintenance costs.

[0008] The purpose of this utility model is achieved through the following technical solution: a cover plate anti-corrosion filter, including a housing and a waterproof cover plate. The lower end face of the waterproof cover plate is provided with a plurality of guide holes, each guide hole is provided with a slot, and a stop block is provided at the slot opening. One side of each guide hole is also provided with a positioning hole integrally formed with the guide hole. The positioning hole extends to communicate with the slot. The waterproof cover plate is fixed to the upper end face of the housing by an elastic pin. The upper end face of the housing is provided with a locking hole corresponding to each guide hole. One end of the elastic pin passes through the positioning hole, is engaged in the slot and abuts against the stop block, and the other end of the elastic pin is screwed into the locking hole.

[0009] Furthermore, the elastic pin includes an integrally formed guide head, a positioning post, and a pin body. The guide head and the pin body are connected by the positioning post. A circumferential limiting platform is provided at the connection between the positioning post and the pin body. The guide head is slidably disposed in the slot through a guide hole, and the positioning post is fixed in the slot through the circumferential limiting platform. The pin body is screwed into the lock hole.

[0010] Furthermore, the guide head is provided with several elastic grooves, and the guide head can be squeezed and deformed in the grooves.

[0011] Furthermore, the elastic pin includes an integrally formed guide post and a pin body. The pin body has a placement cavity, and the placement cavity contains a spring, a positioning post, and a plug. The plug is located at the bottom of the placement cavity. One end of the spring abuts against the plug, and the other end of the spring abuts against the bottom of the positioning post. The upper end of the positioning post extends out of the placement cavity, and the outer periphery of the end of the guide post is set as an external hexagon.

[0012] Furthermore, the waterproof cover plate is provided in one or two sets. When two sets of waterproof cover plates are provided, the waterproof cover plates are respectively provided on the upper and lower end faces of the shell.

[0013] Furthermore, the filter is also provided with a waterproof strip, and the upper end face of the housing is recessed with a waterproof groove corresponding to the waterproof strip. The waterproof strip is embedded in the waterproof groove, and one side of the waterproof strip is in close contact with the lower end face of the waterproof cover plate.

[0014] Furthermore, the sidewall of the housing is provided with several cable interfaces.

[0015] Furthermore, there are four guide holes, each located at one of the four corners of the lower end face of the waterproof cover.

[0016] Furthermore, the side wall of the waterproof cover is provided with locking direction indicator marks and releasing direction indicator marks.

[0017] The beneficial effects of this utility model are as follows: This utility model, through the design of an elastic pin locking into the combiner, and the waterproof cover plate designed with a pin guide hole, a slot, a positioning hole, and a stop, and the elastic pin designed with a guide circle, a positioning post, an elastic groove, and a limiting platform, achieves the design of the elastic pin inside the product, eliminating the need for screw tightening (loosening) steps on the outside of the waterproof cover plate. During assembly, the surface coating will not be damaged due to force, avoiding corrosion verification failure. Simultaneously, the assembly components are hidden inside the product and not exposed to the outside, reducing corrosion problems caused by external factors and improving the product's service life. The elimination of external mounting steps and exposed screws improves the product's aesthetic appeal. Compared with the prior art, this utility model achieves fixation by pushing the waterproof cover plate so that the positioning post enters the slot and finally into the positioning hole, and the elastic pin's upper limiting platform locks the stop on the waterproof cover plate to achieve vertical limitation, effectively solving the technical problems existing in the prior art. Attached Figure Description

[0018] Figure 1 This is a perspective view of the filter in Embodiment 1 of this utility model;

[0019] Figure 2 This is an exploded view of the filter in Embodiment 1 of this utility model;

[0020] Figure 3 This is a cross-sectional view of the filter in the first state in Embodiment 1 of this utility model;

[0021] Figure 4 This is a front view of the filter in Embodiment 1 of this utility model;

[0022] Figure 5 This is a cross-sectional view of the filter in the second state in Embodiment 1 of this utility model;

[0023] Figure 6 This is a cross-sectional view of the filter in the third state in Embodiment 1 of this utility model;

[0024] Figure 7 This is a partial structural schematic diagram of the waterproof cover plate in Embodiment 1 of this utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the elastic pin in Embodiment 1 of this utility model;

[0026] Figure 9 This is a cross-sectional view of the shell in Embodiment 2 of this utility model;

[0027] Figure 10 This is a cross-sectional view of the filter in the first state in Embodiment 2 of this utility model;

[0028] Figure 11 This is a cross-sectional view of the filter in the second state in Embodiment 2 of this utility model;

[0029] Figure 12 This is a cross-sectional view of the filter in the third state in Embodiment 2 of this utility model;

[0030] Figure 13 This is a cross-sectional view of the elastic pin in Embodiment 2 of this utility model;

[0031] Figure 14 This is a perspective view of the elastic pin in Embodiment 2 of this utility model;

[0032] Figure 15 This is a perspective view of the filter in Embodiment 3 of this utility model;

[0033] Figure 16 This is an exploded view of the filter in Embodiment 3 of this utility model;

[0034] Figure 17 This is a cross-sectional view of the filter in Embodiment 3 of this utility model.

[0035] The attached diagram is labeled as follows: 1. Housing; 2. Waterproof cover plate; 21. Guide hole; 22. Slot; 23. Positioning hole; 24. Stop; 3. Waterproof rubber strip; 4. Elastic pin; 41. Guide head; 42. Positioning post; 43. Elastic groove; 44. Limiting platform; 45. Pin body; 46. Guide post; 47. Spring; 48. Plug; 49. External hexagon; 5. Locking direction indicator mark; 6. Loosening direction indicator mark; 7. Locking screw; 8. Cable interface. Detailed Implementation

[0036] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0037] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0038] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0040] 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined. Example 1

[0042] See Figure 1-8A type of anti-corrosion filter with a cover plate includes a housing 1 and a waterproof cover plate 2. The lower end face of the waterproof cover plate 2 is provided with several guide holes 21, and each guide hole 21 is provided with a slot 22. A stop block 24 is provided at the opening of the slot 22. A positioning hole 23 is also provided on one side of each guide hole 21, which is integrally formed with the guide hole 21. The positioning hole 23 extends to communicate with the slot 22. The waterproof cover plate 2 is fixed to the upper end face of the housing 1 by an elastic pin 4. The upper end face of the housing 1 is provided with a locking hole corresponding to each guide hole 21. One end of the elastic pin 4 passes through the positioning hole 23 and is engaged in the slot 22 and abuts against the stop block 24. The other end of the elastic pin 4 is screwed into the locking hole.

[0043] In this embodiment, the housing 1 of the cover plate corrosion-resistant filter is made of aluminum alloy, which has good corrosion resistance and thermal conductivity. The housing 1 is rectangular in shape, with an open structure on its upper end for mounting the waterproof cover plate 2. A filter circuit board is installed inside the housing 1 to implement signal filtering.

[0044] The waterproof cover 2 is made of high-strength engineering plastic, possessing excellent waterproof and corrosion-resistant properties. The shape of the waterproof cover 2 matches the opening on the upper surface of the housing 1. Four guide holes 21 are provided on the lower surface of the waterproof cover 2, each with a diameter of 8mm and a depth of 4mm. Each guide hole 21 contains a groove 22 with a diameter of 10mm and a depth of 2mm. A positioning hole 23, integrally formed with the guide hole 21, is also provided on one side of each guide hole 21. The positioning hole 23 has a diameter of 5mm and extends to communicate with the groove 22. The positioning hole 23 is parallel to the central axis of the guide hole 21.

[0045] The upper end face of the housing 1 is provided with locking holes corresponding to each guide hole 21. The diameter of the locking holes is 6mm and the depth is 10mm. The locking holes are provided with internal threads of M6×1.0. The positions of the locking holes correspond one-to-one with the positions of the guide holes 21 on the lower end face of the waterproof cover 2 to ensure that the waterproof cover 2 can be accurately positioned during installation.

[0046] The elastic pin 4 includes an integrally formed guide head 41, a positioning post 42, and a pin body 45. The guide head 41 and the pin body 45 are connected by the positioning post 42. A circumferential limiting platform 44 is provided at the connection between the positioning post 42 and the pin body 45. The guide head 41 is slidably placed in the slot 22 through the guide hole 21, and the positioning post 42 is fixed in the slot 22 through the circumferential limiting platform 44. The pin body 45 is screwed into the lock hole.

[0047] The guide head 41 of the elastic pin 4 is cylindrical, with a diameter of 9.8 mm and a height of 1.8 mm. The outer diameter of the guide head 41 is slightly smaller than the inner diameter of the slot 22, ensuring that the guide head 41 can slide smoothly into the slot 22. The guide head 41 has several elastic grooves 43, and the guide head 41 can be deformed by compression in the slot 22. The elastic grooves 43 are radially distributed, with a total of 4 elastic grooves 43. Each elastic groove 43 has a width of 1 mm and a depth of 1.5 mm. The elastic grooves 43 give the guide head 41 a certain elastic deformation capability. When the guide head 41 enters the slot 22, it can achieve a locking effect through elastic deformation.

[0048] The positioning post 42 is cylindrical with a diameter of 4.8 mm and a length of 6 mm. The diameter of the positioning post 42 is slightly smaller than the diameter of the positioning hole 23 to ensure that the positioning post 42 can pass smoothly through the positioning hole 23. A circumferential limiting platform 44 is provided at the connection between the positioning post 42 and the pin body 45. The outer diameter of the circumferential limiting platform 44 is 6 mm, and its thickness is 1 mm. The circumferential limiting platform 44 is used to limit the position of the positioning post 42 within the slot 22 and abuts against the stop block 24 to prevent the positioning post 42 from coming out of the slot 22.

[0049] The pin body 45 is cylindrical, with a diameter of 5.8 mm and a length of 12 mm. The outer surface of the pin body 45 is provided with external threads of M6×1.0, which match the internal threads in the lock hole. The top of the pin body 45 is provided with a slotted notch, which is 1 mm wide and 2 mm deep, for rotating the pin body 45 using a flathead screwdriver.

[0050] One or two sets of waterproof cover plates 2 are provided. When two sets of waterproof cover plates 2 are provided, the waterproof cover plates 2 are respectively provided on the upper and lower end faces of the housing 1. In this embodiment, one set of waterproof cover plates 2 is provided and installed on the upper end face of the housing 1. The waterproof cover plate 2 is fixed to the housing 1 by four elastic pins 4, and the four elastic pins 4 correspond to the four guide holes 21 on the lower end face of the waterproof cover plate 2.

[0051] The filter also features a waterproof strip 3. A waterproof groove is recessed on the upper surface of the housing 1 corresponding to the waterproof strip 3. The waterproof strip 3 is embedded within the waterproof groove, and one side of the waterproof strip 3 is in close contact with the lower surface of the waterproof cover plate 2. The waterproof groove is 5mm wide and 3mm deep, and is distributed in a rectangular ring along the edge of the upper surface of the housing 1. The waterproof strip 3 is made of silicone, possessing good elasticity and sealing performance. The cross-section of the waterproof strip 3 is D-shaped. After installation in the waterproof groove, its top protrudes 1mm above the upper surface of the housing 1, ensuring a tight contact with the lower surface of the waterproof cover plate 2 and forming a good seal.

[0052] The side wall of the housing 1 is provided with several cable interfaces 8, which are used to connect signal cables of external devices. The cable interfaces 8 adopt a waterproof connector design to ensure that no moisture will seep into the interior of the housing 1 in a humid environment. There are a total of 3 cable interfaces 8, distributed on one side wall of the housing 1. The cable interfaces 8 are equipped with waterproof washers and lock nuts to fix the cables and achieve a waterproof seal.

[0053] There are four guide holes 21, each located at one of the four corners of the lower end face of the waterproof cover plate 2. The four guide holes 21 are arranged in a rectangular pattern. The guide holes 21 are provided to ensure that the waterproof cover plate 2 can be accurately positioned on the housing 1, preventing installation misalignment.

[0054] The side wall of the waterproof cover 2 is provided with a locking direction indicator mark 5 and a loosening direction indicator mark 6. The locking direction indicator mark 5 is a clockwise arrow symbol, and the loosening direction indicator mark 6 is a counterclockwise arrow symbol. The two marks are located at opposite positions on the side wall of the waterproof cover 2. The marks are raised and protrude 0.5mm above the side wall surface, making it easy for users to identify the rotation direction by touch during operation.

[0055] The installation method of the cover plate anti-corrosion filter in this embodiment is as follows: First, the waterproof strip 3 is embedded into the waterproof groove on the upper end face of the housing 1; then, the waterproof cover plate 2 is placed on the upper end face of the housing 1, so that the guide hole 21 on the lower end face of the waterproof cover plate 2 is aligned with the lock hole on the upper end face of the housing 1; next, the guide head 41 of the elastic pin 4 is inserted into the slot 22 through the guide hole 21 of the waterproof cover plate 2, and at the same time, the positioning pin 42 passes through the positioning hole 23 and enters the slot 22; finally, the pin body 45 is rotated so that the pin body 45 is screwed into the lock hole, thus completing the installation and fixing of the waterproof cover plate 2.

[0056] The disassembly method of the cover plate anti-corrosion filter in this embodiment is as follows: Push the waterproof cover plate 2 towards the loosening direction indicator mark 6, so that the positioning post 42 is subjected to force and finally enters the guide hole 21 through the slot 22. At this time, the waterproof cover plate 2 is in a loose state. Lift the waterproof cover plate 2 upward to complete the quick disassembly.

[0057] In this embodiment, the anti-corrosion filter uses a flexible pin 4 to fix the waterproof cover 2 to the housing 1, enabling quick installation and removal of the waterproof cover 2 for easy maintenance and repair. Simultaneously, the waterproof strip 3 ensures the filter's waterproof performance, preventing moisture from seeping into the housing 1 and damaging the filter circuit. The guide head 41 of the flexible pin 4 has an elastic groove 43, giving it a certain elastic deformation capacity to adapt to different installation conditions and improve installation reliability. Example 2

[0058] See Figure 9-14A type of anti-corrosion filter with a cover plate includes a housing 1 and a waterproof cover plate 2. The lower end face of the waterproof cover plate 2 is provided with a plurality of guide holes 21, and each guide hole 21 is provided with a slot 22. One side of each guide hole 21 is also provided with a positioning hole 23 integrally formed with the guide hole 21. The positioning hole 23 extends to communicate with the slot 22. The waterproof cover plate 2 is fixed to the upper end face of the housing 1 by an elastic pin 4. The upper end face of the housing 1 is provided with a locking hole corresponding to each guide hole 21. One end of the elastic pin 4 passes through the positioning hole 23 and is locked in the slot 22, and the other end of the elastic pin 4 is screwed into the locking hole.

[0059] The difference between this embodiment and Embodiment 1 lies in the structure of the elastic pin 4. In this embodiment, the elastic pin 4 includes an integrally formed guide post 46 and a pin body 45. The pin body 45 has a placement cavity, which contains a spring 47, a positioning post 42, and a plug 48. The plug 48 is located at the bottom of the placement cavity, with one end extending out of the cavity. One end of the spring 47 abuts against the plug 48, and the other end of the spring 47 abuts against the bottom of the positioning post 42. The upper end of the positioning post 42 extends out of the cavity, and the outer periphery of the end of the guide post 46 is set with an external hexagon 49.

[0060] The guide post 46 of the resilient pin 4 is cylindrical with a diameter of 4.8 mm and a length of 8 mm. The diameter of the guide post 46 is slightly smaller than the diameter of the positioning hole 23 to ensure that the guide post 46 can pass smoothly through the positioning hole 23. The outer periphery of the end of the guide post 46 is set as an external hexagon 49 with a distance between opposite sides of the external hexagon 49 of 6 mm and a height of 2 mm. The external hexagon 49 structure facilitates the rotation of the resilient pin 4 using a hex wrench.

[0061] The pin body 45 is cylindrical with a diameter of 5.8 mm and a length of 15 mm. The outer surface of the pin body 45 is provided with external threads of M6×1.0, which match the internal threads in the lock hole. The pin body 45 has a housing cavity, which is cylindrical with a diameter of 4 mm and a depth of 12 mm.

[0062] The placement cavity is equipped with a spring 47, a positioning post 42, and a plug 48. The plug 48 is located at the bottom of the placement cavity, with one end extending out of the cavity. The plug 48 is cylindrical, with a diameter of 3.8 mm and a thickness of 2 mm. The plug 48 is interference-fitted with the inner wall of the placement cavity to ensure that it will not come out of the cavity. The spring 47 is a compression spring with an outer diameter of 3.5 mm, a wire diameter of 0.5 mm, and a free length of 8 mm. One end of the spring 47 abuts against the plug 48, and the other end abuts against the bottom of the positioning post 42.

[0063] The positioning post 42 is cylindrical, with a diameter of 3.8 mm and a length of 10 mm. The lower end of the positioning post 42 is located within the placement cavity, while the upper end extends out of the cavity. The upper end of the positioning post 42 is 5 mm long and 3.8 mm in diameter, and its surface is smooth for easy insertion into the slot 22. The positioning post 42 can move up and down within the placement cavity under the action of the spring 47. When the positioning post 42 is compressed by an external force, the spring 47 is compressed, and the positioning post 42 moves downwards; when the external force disappears, the spring 47 returns to its original shape, pushing the positioning post 42 upwards.

[0064] The installation method of the cover plate anti-corrosion filter in this embodiment is as follows: First, the waterproof strip 3 is embedded into the waterproof groove on the upper end face of the housing 1; then, the waterproof cover plate 2 is placed on the upper end face of the housing 1, so that the guide hole 21 on the lower end face of the waterproof cover plate 2 is aligned with the lock hole on the upper end face of the housing 1; next, the guide post 46 of the elastic pin 4 is inserted through the positioning hole 23 of the waterproof cover plate 2; then, the positioning post 42 is pressed, so that the positioning post 42 is retracted into the placement cavity under the compression of the spring 47, and at the same time, the pin body 45 is rotated, so that the pin body 45 is screwed into the lock hole; when the pin body 45 is rotated into place, the positioning post 42 is popped out under the action of the spring 47 and enters the slot 22, completing the installation and fixing of the waterproof cover plate 2.

[0065] The disassembly method of the cover plate anti-corrosion filter in this embodiment is as follows: First, push the waterproof cover plate 2 towards the loosening direction indicator mark 6, so that the positioning post 42 is disengaged from the positioning groove and finally enters the guide hole 21. At this time, the waterproof cover plate 2 is in a loose state. You can quickly disassemble it by lifting the waterproof cover plate 2 upwards.

[0066] In this embodiment, the waterproof cover plate anti-corrosion filter uses an elastic pin 4 with a spring 47 mechanism to fix the waterproof cover plate 2 to the housing 1, enabling quick installation and removal of the waterproof cover plate 2 and facilitating maintenance and repair. The spring 47 mechanism provides the positioning post 42 with an automatic reset function, improving the convenience and reliability of installation. The external hexagonal 49 design at the end of the guide post 46 facilitates operation with standard tools, improving practicality. Example 3

[0067] See Figure 15-17 A type of anti-corrosion filter with a cover plate includes a housing 1 and a waterproof cover plate 2. The lower end face of the waterproof cover plate 2 is provided with a plurality of guide holes 21, and each guide hole 21 is provided with a slot 22. One side of each guide hole 21 is also provided with a positioning hole 23 integrally formed with the guide hole 21. The positioning hole 23 extends to communicate with the slot 22. The waterproof cover plate 2 is fixed to the upper end face of the housing 1 by an elastic pin 4. The upper end face of the housing 1 is provided with a locking hole corresponding to each guide hole 21. One end of the elastic pin 4 passes through the positioning hole 23 and is locked in the slot 22, and the other end of the elastic pin 4 is screwed into the locking hole.

[0068] The difference between this embodiment and Embodiment 1 lies in the number and installation position of the waterproof cover 2. In this embodiment, two sets of waterproof cover 2 are provided, respectively located on the upper and lower end faces of the housing 1.

[0069] The housing 1 is rectangular in shape, with both its upper and lower ends being open for mounting the waterproof cover 2. The upper and lower ends of the housing 1 each have four locking holes, each 6mm in diameter and 10mm deep, with internal threads of M6×1.0.

[0070] Both the upper and lower waterproof cover plates 2 are made of high-strength engineering plastic. Each waterproof cover plate 2 has four guide holes 21 on its lower surface, and each guide hole 21 has a slot 22. Each guide hole 21 also has a positioning hole 23 integrally formed with the guide hole 21 on one side, and the positioning hole 23 extends to communicate with the slot 22.

[0071] Waterproof grooves are provided on the upper and lower ends of the housing 1, and are distributed in a rectangular ring along the edge of the end face. A waterproof strip 3 is embedded in the waterproof groove. The waterproof strip 3 is made of silicone and has a D-shaped cross-section. After being installed in the waterproof groove, its top protrudes 1mm above the end face to ensure a tight fit with the lower end face of the waterproof cover plate 2, forming a good sealing effect.

[0072] The elastic pin 4 includes an integrally formed guide head 41, a positioning post 42, and a pin body 45. The guide head 41 and the pin body 45 are connected by the positioning post 42. A circumferential limiting platform 44 is provided at the connection between the positioning post 42 and the pin body 45. The guide head 41 is slidably disposed in the slot 22 through the guide hole 21, and the positioning post 42 is fixed in the slot 22 by the circumferential limiting platform 44. The pin body 45 is screwed into the locking hole. The guide head 41 has several elastic grooves 43, and the guide head 41 can be deformed by compression in the slot 22.

[0073] The upper waterproof cover plate 2 is fixed to the upper end face of the housing 1 by four elastic pins 4. The structure of the elastic pin 4 is the same as in Embodiment 1. The guide head 41 is cylindrical with a diameter of 9.8 mm and a height of 1.8 mm. The guide head 41 has four radially distributed elastic grooves 43, each with a width of 1 mm and a depth of 1.5 mm. The positioning post 42 is cylindrical with a diameter of 4.8 mm and a length of 6 mm. A circumferential limiting platform 44 is provided at the connection between the positioning post 42 and the pin body 45. The outer diameter of the circumferential limiting platform 44 is 6 mm and the thickness is 1 mm. The pin body 45 is cylindrical with a diameter of 5.8 mm and a length of 12 mm. The outer surface of the pin body 45 is provided with external threads of M6×1.0. The lower waterproof cover plate 2 is fixed to the lower end face of the housing 1 by four locking screws 7.

[0074] The side wall of the housing 1 is provided with several cable interfaces 8, which are used to connect signal cables of external devices. The cable interfaces 8 adopt a waterproof connector design to ensure that no moisture will seep into the interior of the housing 1 in a humid environment. There are a total of 3 cable interfaces 8, distributed on the two side walls of the housing 1. Each cable interface 8 is provided with a waterproof washer and a locking nut to fix the cable and achieve a waterproof seal.

[0075] The upper waterproof cover plate 2 has a locking direction indicator mark 5 and a loosening direction indicator mark 6 on its side wall. The locking direction indicator mark 5 is a clockwise arrow symbol, and the loosening direction indicator mark 6 is a counterclockwise arrow symbol. The two marks are located at opposite positions on the side wall of the waterproof cover plate 2. The marks are raised and protrude 0.5mm above the side wall surface, so that users can easily identify the rotation direction by touch during operation.

[0076] The corrosion-resistant filter in this embodiment achieves bidirectional waterproof protection by providing waterproof covers 2 on both the upper and lower end faces of the housing 1, thereby improving the filter's adaptability and reliability in harsh environments. The two sets of waterproof covers 2 provide better protection for the circuit board inside the filter, preventing moisture, dust, and other harmful substances from entering the housing 1 from any direction, thus extending the filter's service life.

[0077] It should be noted that Embodiment 1, Embodiment 2, and Embodiment 3 are all types of cover plate anti-corrosion filters.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cover corrosion-resistant filter comprising a housing and a water-resistant cover, characterized in that: The lower end face of the waterproof cover plate is provided with several guide holes, each guide hole is provided with a slot, and one side of each guide hole is also provided with a positioning hole integrally formed with the guide hole. The positioning hole extends to communicate with the slot. The waterproof cover plate is fixed to the upper end face of the housing by an elastic pin. The upper end face of the housing is provided with a locking hole corresponding to each guide hole. One end of the elastic pin passes through the positioning hole and is locked in the slot, and the other end of the elastic pin is screwed into the locking hole.

2. A cover plate corrosion-resistant filter according to claim 1, characterized in that: The elastic pin includes an integrally formed guide head, a positioning post, and a pin body. The guide head and the pin body are connected by the positioning post. A circumferential limiting platform is provided at the connection between the positioning post and the pin body. The guide head is slidably disposed in the slot through a guide hole, and the positioning post is fixed in the slot through the circumferential limiting platform. The pin body is screwed into the lock hole.

3. A cover plate corrosion-resistant filter according to claim 2, wherein: The guide head is provided with several elastic grooves, and the guide head can be squeezed and deformed in the grooves.

4. The cover plate corrosion-resistant filter of claim 1, wherein: The elastic pin includes an integrally formed guide post and a pin body. The pin body has a placement cavity, and the placement cavity contains a spring, a positioning post, and a plug. The plug is located at the bottom of the placement cavity. One end of the spring abuts against the plug, and the other end of the spring abuts against the bottom of the positioning post. The upper end of the positioning post extends out of the placement cavity, and the outer periphery of the end of the guide post is set with an external hexagon.

5. A cover plate corrosion-resistant filter according to any one of claims 1-3, characterized in that: The waterproof cover plate is provided in one or two sets. When two sets of waterproof cover plates are provided, the waterproof cover plates are respectively provided on the upper and lower end faces of the shell.

6. A cover plate corrosion-resistant filter according to claim 5, characterized in that: The filter is also provided with a waterproof strip. The upper end face of the housing is recessed with a waterproof groove corresponding to the waterproof strip. The waterproof strip is embedded in the waterproof groove, and one side of the waterproof strip is in close contact with the lower end face of the waterproof cover plate.

7. The cover plate corrosion-resistant filter of claim 1, wherein: The sidewall of the housing is provided with several cable interfaces.

8. The cover plate corrosion-resistant filter of claim 1, wherein: There are four guide holes, each located at one of the four corners of the lower end face of the waterproof cover.

9. The cover plate corrosion-resistant filter of claim 1, wherein: The side wall of the waterproof cover is provided with locking direction indicator marks and loosening direction indicator marks.

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