Corrosion-resistant gate valve

Abstract

The utility model provides a kind of corrosion-resistant gate valve, including valve body and the inner sealing groove being arranged in the delivery channel of both ends thereof, by being arranged the matching filter plate in the inside of the sealing groove of both sides' delivery channel, and the sealing frame being fixedly connected in the outer side wall of filter plate, for the fixed position of filter plate in inner sealing groove and sealing, while being provided with the sealing pad being matched with sealing frame and the outer side wall of filter plate in the inside of inner sealing groove, further seal, since the utility model is driven adjusting lead screw to move downward by rotating locking bolt, limit seat is driven to compress sealing cover top, to tightly compress sealing cover into outer sealing groove, while by sealing frame, filter plate is compressed to the sealing pad in inner sealing groove as a whole, the uniform distribution of this vertical downward compressing force, significantly improve the overall sealing performance of filter plate installation groove, fundamentally prevent medium from leaking from filter assembly installation interface, ensure the long-term sealing reliability of gate valve in corrosive medium environment.

Description

Technical Field

[0001] This utility model relates to the technical field of gate valves, and specifically to a corrosion-resistant gate valve. Background Technology

[0002] Corrosion-resistant gate valves are valves specifically designed for highly corrosive media. They are made using fluoropolymer (FEP / F46) or rubber lining processes, with the valve body covered by fluoroplastic materials such as polytetrafluoroethylene. They can withstand harsh media such as sulfuric acid, hydrochloric acid, aqua regia, and strong oxidants. Their elastic wedge-shaped sealing structure compensates for deviations, combining corrosion resistance with sealing reliability. They are suitable for temperatures ranging from -50℃ to 150℃ and pressure ratings from PN10 to PN16. They are widely used in chemical, pharmaceutical, and environmental protection fields, such as chlorine pipelines in the chlor-alkali industry or sludge control in sewage treatment plants.

[0003] According to Chinese patent number "CN 221628884 U", a corrosion-resistant gate valve is disclosed, comprising a filter screen fixedly connected inside a circular ring, a connecting rod installed on the top side of the circular ring with a groove inside the connecting rod, a support plate installed on the top side of the gate valve body, a fixing plate installed on the top side of the gate valve body, a tension spring fixedly connected between the fixing plate and the support plate, a sliding rod slidably installed in the fixing plate and the support plate, and a locking block installed at one end of the rotating shaft. When installing the filter screen, the circular ring is installed in the annular groove, the handle is released, and the tension spring pushes the sliding rod to the right through its elasticity, causing the locking block to re-insert into the groove. The locking block is rotated by the rotating shaft, thereby fixing the position of the circular ring and the filter screen. When the fluid passes through the filter screen, impurities in the fluid are filtered out, thus achieving the interception and filtration of impurities in the fluid in the channel, improving the corrosion resistance of the gate valve, and extending the service life of the gate valve.

[0004] The corrosion-resistant gate valve described above utilizes elastic force in conjunction with a handle, slide bar, locking block, and grooved rotating shaft to enable quick disassembly of the fixed ring and filter screen installation positions, facilitating their removal and cleaning. Simultaneously, the filter screen intercepts impurities during use, improving the equipment's corrosion resistance. However, in actual use, the annular groove used to install the fixed ring and filter screen is connected to the outside, requiring a certain level of sealing. Existing technologies only use a spring in conjunction with the locking block and slide bar to apply horizontal force to the ring, resulting in uneven stress distribution on the ring under this horizontal force, inevitably leading to leakage problems in actual use. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing method that only uses a spring in conjunction with a locking block and a sliding rod to achieve a horizontal force on the ring, so that the ring is only subjected to a horizontal force. This results in uneven stress on the seal under this horizontal force, which will inevitably lead to leakage in actual use.

[0006] The technical solution adopted to solve the above technical problems is: A corrosion-resistant gate valve includes a valve body and an inner sealing groove disposed in the conveying channels at both ends thereon. The inner sealing groove is provided with a matching filter plate and a sealing frame fixedly connected to the outer wall of the filter plate. The inner sealing groove is provided with a sealing gasket that matches both the sealing frame and the outer wall of the filter plate. An outer sealing groove is provided at the top opening of the inner sealing groove. A sealing cover is covered inside the outer sealing groove. The sealing cover is fixedly connected to the sealing frame. Limit seats are provided at both ends of the top of the sealing cover. An adjusting screw is rotatably connected to one side of the limit seat. The adjusting screw is threadedly connected to one side of the valve body. Rotating the adjusting screw causes the limit seat to press against the top of the sealing cover.

[0007] As a preferred embodiment of this utility model, the top of the sealing cover is provided with a connecting seat, and the lower ends of the limiting seats are disposed inside the connecting seats on both sides.

[0008] As a preferred embodiment of this utility model, a support frame is threadedly connected to one side of the valve body via a positioning seat. A limiting spring is provided at the top of the support frame near the limiting seat. The upper end of the limiting spring contacts the limiting seat. The lower end of the limiting seat passes through the support frame and extends into the corresponding connecting seat. The adjusting screw is threadedly connected to the adjusting screw, and its upper end is rotatably connected to one side of the limiting seat. A locking bolt is threadedly connected to the bottom side of the adjusting screw near the support frame. Rotating the locking bolt causes the adjusting screw and the limiting seat to move downward, controlling the sealing cover to press against the outer sealing groove.

[0009] As a preferred embodiment of this utility model, a positioning seat is connected to the top of the conveying channel, and one side of the support frame is inserted into the positioning seat.

[0010] As a preferred technical solution of this utility model, the valve body further includes a gate body that is slidably disposed within the valve body. A screw is rotatably connected to the upper end of the gate body. The screw is threadedly connected to one side of the valve cover. The screw and the outer side wall of the gate body are jointly provided with a valve cover. The screw is threadedly connected to one side of the valve cover. The valve cover is connected to the top of the valve body. The inside of the support frame is connected to the valve cover by a first bolt.

[0011] As a preferred technical solution of this utility model, the outer side wall of the valve cover is rotatably connected with adjusting rods, and the outer side of the two adjusting rods is provided with a pressure plate. The side of the two adjusting rods near the top of the pressure plate is threaded with a second bolt. The bottom of the pressure plate is connected with a hard sealing gasket, and the bottom of the hard sealing gasket abuts against the opening at the top of the valve cover.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model effectively solves the problems of uneven sealing and easy leakage caused by relying solely on horizontal clamping force in existing filter components by adding an outer sealing groove to the top of the inner sealing groove of the conveying channel at both ends of the valve body, and setting a sealing cover integrated with the filter plate and sealing frame. In conjunction with a vertical clamping mechanism consisting of an adjusting screw, a limit seat and a locking bolt, the present invention provides a solution to the problem of uneven sealing and easy leakage caused by relying solely on horizontal clamping force in existing filter components. When it is necessary to lock the filter component, rotating the locking bolt drives the adjusting screw to move downward, which drives the limit seat to press the top of the sealing cover, thereby pressing the sealing cover tightly into the outer sealing groove. At the same time, the sealing frame presses the filter plate as a whole against the sealing gasket in the inner sealing groove. The vertical downward clamping force is evenly distributed, which significantly improves the overall sealing performance of the filter plate mounting groove, fundamentally preventing the medium from leaking from the filter component mounting interface, and ensuring the long-term sealing reliability of the gate valve in corrosive media environments.

[0013] 2. This utility model ensures accurate transmission of clamping force by embedding the lower end of the limiting seat into the connecting seats on both sides of the sealing cover. The support frame is firmly connected to the valve body through the positioning seat, providing a reliable installation foundation for the adjusting screw. The setting of the limiting spring can provide continuous elastic compensation after clamping, adapting to fluctuations in working conditions. In addition, the top of the valve cover is equipped with an auxiliary sealing structure consisting of an adjusting rod, a pressure plate, and a hard sealing gasket. By tightening the second bolt, the pressure plate can be driven to press the hard sealing gasket, thereby achieving an effective seal at the valve stem opening. The overall structure ensures excellent sealing performance while also taking into account the convenience of filter plate installation, disassembly, and maintenance, significantly improving the practicality and service life of the gate valve. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model; Figure 3 This is a partial cross-sectional structural diagram of the present invention.

[0015] In the diagram: 1. Valve body; 2. Inner sealing groove; 3. Sealing frame; 4. Filter plate; 5. Sealing gasket; 6. Outer sealing groove; 7. Sealing cover; 8. Connecting seat; 9. Limit seat; 10. Limit spring; 11. Locking bolt; 12. Adjusting screw; 13. Support frame; 14. Positioning seat; 15. Valve cover; 16. Screw; 17. Gate body; 18. Adjusting rod; 19. Pressure plate; 20. Hard sealing gasket. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0021] Example 1 exist Figures 1-3This utility model provides a technical solution: a corrosion-resistant gate valve, which includes a valve body 1 and inner sealing grooves 2 disposed in the conveying channels at both ends. Matching filter plates 4 and sealing frames 3 fixedly connected to the outer walls of the filter plates 4 are disposed inside the sealing grooves 2 on both sides of the conveying channels to fix and seal the filter plates 4 within the inner sealing grooves 2. Sealing gaskets 5, which match the sealing frames 3 and the outer walls of the filter plates 4, are also disposed inside the inner sealing grooves 2 for further sealing. An outer sealing groove 6 is provided at the top opening of the inner sealing groove 2, and the interior of the outer sealing groove 6 is covered. With a sealing cover 7, a layer-by-layer seal is achieved from the inside out, improving the overall sealing performance of the inner sealing groove 2. At the same time, the sealing cover 7 is fixedly connected to the sealing frame 3. Both ends of the top of the sealing cover 7 are provided with limit seats 9. One side of the limit seat 9 is rotatably connected to an adjusting screw 12. The adjusting screw 12 is threadedly connected to one side of the valve body 1. Compared with the prior art, by externally rotating the adjusting screw 12 to move up and down, the limit seat 9 is moved together. When moving downward, the limit seat 9 is controlled to press against the top of the sealing cover 7, thereby achieving a vertical downward force on the top of the sealing cover 7, improving the sealing effect and preventing leakage. Meanwhile, a connecting seat 8 is installed opposite to the top of the sealing cover 7, and the lower end of the limiting seat 9 is set inside the connecting seats 8 on both sides. The connecting seat 8 on the sealing cover 7 positions the limiting seat 9, improves the concentration effect of vertical force, and improves the sealing performance.

[0022] In one aspect of this embodiment, the sealing performance at the sealing cover 7 is further improved. A support frame 13 is threadedly connected to one side of the valve body 1 via a positioning seat 14. A limiting spring 10 is provided at the top of the support frame 13 near the limiting seat 9. The limiting spring 10 forms an elastic seal, and the upper end of the limiting spring 10 contacts the limiting seat 9. The lower end of the limiting seat 9 passes through the support frame 13 and extends into the corresponding connecting seat 8. An adjusting screw 12 is threadedly connected to the adjusting support frame 13, and its upper end is rotatably connected to one side of the limiting seat 9. A locking bolt 11 is threadedly connected to the adjusting screw 12 near the bottom of the support frame 13. By rotating the locking bolt 11, the adjusting screw 12 is controlled to move up and down along the support frame 13, while simultaneously moving the limiting seat 9. While controlling the limiting seat 9 to move down, the sealing cover 7 is controlled to press against the outer sealing groove 6. At the same time, the sealing frame 3 and the filter plate 4 are controlled to fit more tightly with the sealing gasket 5, thereby improving the sealing effect. Secondly, it should be noted that a protective sleeve matching the adjusting screw 12 is provided inside the locking bolt 11. When the locking bolt 11 is rotated, the control screw moves and cleans itself inside the sleeve.

[0023] In one aspect of this embodiment, a positioning seat 14 is connected to the top of the conveying channel, and one side of the support frame 13 is inserted into the positioning seat 14 to ensure the stability of the support frame 13 during installation.

[0024] In one aspect of this embodiment, the valve body 1 further includes a gate body 17 slidably disposed within the valve body 1. A screw 16 is rotatably connected to the upper end of the gate body 17. A valve cover 15 is provided on the outer side wall of the screw 16 and the gate body 17. The screw 16 is threadedly connected to one side of the valve cover 15. The valve cover 15 is connected to the top of the valve body 1. The inside of the support frame 13 is connected to the valve cover 15 by a first bolt. Rotating the screw 16 moves up and down along one side of the valve cover 15, while simultaneously driving the gate body 17 to move up and down along the inside of the valve body 1, thereby realizing the opening and closing operation. Meanwhile, adjusting rods 18 are rotatably connected to the outer side wall of the valve cover 15. A pressure plate 19 is provided on the outer side of the two adjusting rods 18. A second bolt is threaded to the side of the two adjusting rods 18 near the top of the pressure plate 19. A hard sealing gasket 20 is connected to the bottom of the pressure plate 19. The bottom of the hard sealing gasket 20 is pressed against the opening at the top of the valve cover 15. By rotating the second bolts simultaneously or individually, the pressure plate 19 can be controlled to squeeze the hard sealing gasket 20 on one side or as a whole to further seal the opening at the top of the valve cover 15. The pressure plate 19 has a certain degree of elasticity and deformability.

[0025] The specific operating principle of the corrosion-resistant gate valve described in this utility model is as follows: When it is necessary to install or lock the filter assembly, the operator first places the assembly with the sealing frame 3 and the filter plate 4 into the inner sealing groove 2 of the conveying channel at both ends of the valve body 1, so that the outer walls of the sealing frame 3 and the filter plate 4 are initially in contact with the sealing gasket 5 in the groove. Then, the sealing cover 7, which is fixedly connected to the sealing frame 3, is placed on the outer sealing groove 6 at the top of the inner sealing groove 2. Next, the locking bolt 11 installed at the bottom of the support frame 13 is rotated, driving the adjusting screw 12 that meshes with it to move downward along the support frame 13. The upper end of the adjusting screw 12 is rotatably connected to one side of the limit seat 9, and its downward movement drives the limit seat 9 to move downward synchronously. The lower end of the limit seat 9 is inserted into the top of the sealing cover 7. The vertical downward force is evenly transmitted to the sealing cover 7 inside the connecting seats 8 on both sides of the part, forcing the sealing cover 7 to be tightly pressed into the outer sealing groove 6. At the same time, the filter plate 4 is pressed into the sealing gasket 5 in the inner sealing groove 2 by the sealing frame 3. This vertical pressing process ensures that the multiple sealing interfaces from the outer sealing groove to the inner sealing groove all obtain uniform and reliable pressing force, effectively preventing media leakage. The limit spring 10 at the top of the support frame 13 continuously provides elastic compensation during this process to maintain stable sealing pressure. When it is necessary to disassemble, clean or replace the filter plate 4, the locking bolt 11 is rotated in the opposite direction to lift the adjusting screw 12 and the limit seat 9 to release the pressing force. At the same time, the entire sealing structure is detachable, and the filter assembly can be easily removed. In addition, by rotating the second bolt on the adjusting rod 18 on the valve cover 15, the hard sealing gasket 20 below the pressure plate 19 can be driven to press the valve cover opening, further enhancing the sealing performance at the valve stem.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A corrosion-resistant gate valve, comprising a valve body (1) and an inner sealing groove (2) disposed in conveying channels at both ends thereof, wherein the inner sealing groove (2) is provided with a matching filter plate (4) and a sealing frame (3) fixedly connected to the outer wall of the filter plate (4), and the inner sealing groove (2) is provided with sealing gaskets (5) that are matched with the sealing frame (3) and the outer wall of the filter plate (4), characterized in that: The inner sealing groove (2) has an outer sealing groove (6) at its top opening. The outer sealing groove (6) is covered by a sealing cover (7). The sealing cover (7) is fixedly connected to the sealing frame (3). The two ends of the top of the sealing cover (7) are provided with a limiting seat (9). One side of the limiting seat (9) is rotatably connected to an adjusting screw (12). The adjusting screw (12) is threadedly connected to one side of the valve body (1). Rotating the adjusting screw (12) causes the limiting seat (9) to press against the top of the sealing cover (7).

2. The corrosion-resistant gate valve according to claim 1, characterized in that: The top of the sealing cover (7) is fitted with a connecting seat (8) opposite to it, and the lower end of the limiting seat (9) is disposed inside the connecting seats (8) on both sides.

3. The corrosion-resistant gate valve according to claim 2, characterized in that: A support frame (13) is threadedly connected to one side of the valve body (1) by a first bolt. A limit spring (10) is provided on the top of the support frame (13) near the limit seat (9). The upper end of the limit spring (10) contacts the limit seat (9). The lower end of the limit seat (9) passes through the support frame (13) and extends into the corresponding connecting seat (8). The adjusting screw (12) is threadedly connected in the support frame (13). Its upper end is rotatably connected to one side of the limit seat (9). A locking bolt (11) is threadedly connected to the bottom side of the adjusting screw (12) near the support frame (13). Rotating the locking bolt (11) causes the adjusting screw (12) and the limit seat (9) to move down, controlling the sealing cover (7) to press against the outer sealing groove (6).

4. A corrosion-resistant gate valve according to claim 3, characterized in that: The top of the conveying channel is connected to a positioning seat (14), and one side of the support frame (13) is inserted into the positioning seat (14).

5. A corrosion-resistant gate valve according to claim 3, characterized in that: The valve body (1) also includes a gate body (17) that is slidably disposed within the valve body (1). A screw (16) is rotatably connected to the upper end of the gate body (17). A valve cover (15) is provided on the outer side wall of the screw (16) and the gate body (17). The screw (16) is threadedly connected to one side of the valve cover (15). The valve cover (15) is connected to the top of the valve body (1). The inside of the support frame (13) is connected to the valve cover (15) by a first bolt.

6. A corrosion-resistant gate valve according to claim 5, characterized in that: The outer side wall of the valve cover (15) is rotatably connected to an adjusting rod (18). The outer sides of the two adjusting rods (18) are provided with a pressure plate (19). The two adjusting rods (18) are threaded with a second bolt on the side near the top of the pressure plate (19). The bottom of the pressure plate (19) is connected to a hard sealing gasket (20). The bottom of the hard sealing gasket (20) is pressed against the opening at the top of the valve cover (15).

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