Detachable valve seat sealing structure of pneumatic stop valve

Abstract

The utility model relates to the field of pneumatic cut-off valves, and discloses a detachable pneumatic cut-off valve seat sealing structure which comprises a lower valve seat, the lower valve seat is arranged on the surface of a pipeline, an upper valve seat is detachably arranged above the lower valve seat, annular grooves are formed in the two sides, close to each other, of the lower valve seat and the upper valve seat respectively, and the annular grooves are communicated with the lower valve seat. An annular groove is formed in the top face of the upper valve seat, an elastic ring is fixed in the annular groove, two threaded columns are fixed to the top face of the lower valve seat, two sleeving holes are formed in the top face of the upper valve seat, and the threaded columns penetrate through the surfaces of the sleeving holes to be in threaded connection with nuts. According to the utility model, the downward acting force is applied to the upper valve seat through the nut which is screwed downwards, so that the two elastic rings can be extruded and attached together by utilizing the elasticity of the elastic rings made of rubber, and the sealing performance between the lower valve seat and the upper valve seat can be further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of pneumatic shut-off valves, specifically to a detachable pneumatic shut-off valve seat sealing structure. Background Technology

[0002] The valve seat of a pneumatic shut-off valve is a key component that works with the valve core to achieve a seal. It typically consists of the valve body, sealing surface, and valve core. Its main function is to ensure complete isolation of the medium when the valve is closed, preventing leakage. The valve seat material is selected according to the operating conditions, and common materials include metals (such as hard alloys and stainless steel), rubber, or polytetrafluoroethylene (PTFE).

[0003] According to Chinese Patent No. CN219774961U, a high-sealing pneumatic shut-off valve includes a valve body, a valve seat, a valve cover, and a pneumatic valve drive mechanism. The valve seat is located on the top of the outer wall of the valve body, and the valve cover is connected to the valve seat through a sealing element. The valve cover is located on the bottom of the outer wall of the pneumatic valve drive mechanism. The pneumatic valve drive mechanism includes components such as a valve core, a valve stem, and an actuator, all of which are components of existing pneumatic shut-off valves and will not be described in detail here. The top of the valve seat and near its outer edge are provided with four rectangular connecting blocks arranged in a circular array. The bottom of the valve cover is provided with four rectangular connecting slots for the four rectangular connecting blocks to be inserted.

[0004] In the above scheme, a rectangular connecting block is used to fix the valve seat and valve cover together. However, when the valve seat and valve cover are connected and fixed together, the rectangular connecting block can only provide lateral limiting function. The compressive force between the valve seat and valve cover may be insufficient, which will affect the sealing effect of the rubber sealing ring. Utility Model Content

[0005] The purpose of this invention is to provide a detachable pneumatic shut-off valve seat sealing structure to solve the problem that the rectangular connecting block can only provide lateral limiting function, and the compressive force between the valve seat and the valve cover may be insufficient, affecting the sealing effect of the rubber sealing ring.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a detachable pneumatic shut-off valve seat sealing structure, including a lower valve seat, which is disposed on the surface of a pipeline, and an upper valve seat is detachably disposed above the lower valve seat. Annular grooves are respectively opened on the two sides of the lower valve seat and the upper valve seat that are close to each other. An elastic ring is fixed inside the annular groove. Two threaded posts are fixed on the top surface of the lower valve seat, and two sleeve holes are opened on the top surface of the upper valve seat. Nuts are threadedly connected to the surface of the sleeve holes through the threaded posts.

[0007] Preferably, the top surface of the lower valve seat is fixed with two fixing plates, and the bottom surface of the upper valve seat is provided with two fixing grooves, and the fixing plates are slidably disposed with respect to the fixing grooves.

[0008] Preferably, the surface of the upper valve seat has two rotating holes, the inside of the fixing groove has a threaded groove, a fixing bolt is inserted into the rotating hole, and one end of the fixing bolt passes through the fixing plate and is threadedly connected to the threaded groove.

[0009] Preferably, a pneumatic box is provided above the upper valve seat, and a rotating shaft is rotatably provided inside the pneumatic box. A rotating hemisphere is fixed at the top of the rotating shaft, and the rotating shaft is rotatably inserted with the lower valve seat and the upper valve seat.

[0010] Preferably, flanges are fitted on the surfaces of both ends of the pipe, and a plurality of connection holes are opened on one side of the flanges, with connecting bolts inserted into the connection holes.

[0011] Preferably, sealing rings are fixed at both ends of the pipe.

[0012] Compared with existing technologies, the detachable pneumatic shut-off valve seat sealing structure using the above-mentioned technical solution has the following advantages:

[0013] 1. By screwing the nut downwards, a downward force is applied to the upper valve seat. The elasticity of the rubber elastic ring itself is used to squeeze the two elastic rings together, thereby increasing the sealing between the lower and upper valve seats.

[0014] 2. The installation and fixation of the two pipes are carried out by splicing two flanges. When the two pipes are spliced ​​together, the sealing ring will be squeezed between the two pipes. When the valve body angle inside the pipe changes, the rotating hemisphere will rotate synchronously with the valve body under the drive of the rotating shaft. Then, the state of the valve body inside the pipe can be judged by the different color positions of the two lobes on the surface of the rotating hemisphere. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of an embodiment.

[0016] Figure 2 This is a schematic diagram of the split section in an embodiment.

[0017] Figure 3 This is a schematic diagram of the disassembled upper valve seat and fixing plate in an embodiment.

[0018] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point A in the middle.

[0019] In the diagram: 1. Pipe; 2. Lower valve seat; 3. Upper valve seat; 4. Annular groove; 5. Elastic ring; 6. Threaded post; 7. Sleeve hole; 8. Nut; 9. Fixing plate; 10. Fixing groove; 11. Rotating hole; 12. Fixing bolt; 13. Threaded groove; 14. Pneumatic box; 15. Rotating shaft; 16. Rotating hemisphere; 17. Flange; 18. Connecting hole; 19. Connecting bolt; 20. Sealing ring. Detailed Implementation

[0020] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] like Figures 1-4 As shown, a detachable pneumatic shut-off valve seat sealing structure includes a lower valve seat 2, which is disposed on the surface of a pipe 1. An upper valve seat 3 is detachably disposed above the lower valve seat 2. Annular grooves 4 are respectively opened on the two sides of the lower valve seat 2 and the upper valve seat 3 that are close to each other. An elastic ring 5 is fixed inside the annular groove 4. Two threaded posts 6 are fixed on the top surface of the lower valve seat 2. Two sleeve holes 7 are opened on the top surface of the upper valve seat 3. Nuts 8 are threadedly connected to the surface of the sleeve holes 7 through the threaded posts 6. Two fixing plates 9 are fixed on the top surface of the lower valve seat 2. Two fixing grooves 10 are opened on the bottom surface of the upper valve seat 3. The fixing plates 9 and the fixing grooves 10 are slidably disposed. Two rotating holes 11 are opened on the surface of the upper valve seat 3. A threaded groove 13 is opened on one side of the inside of the fixing groove 10. A fixing bolt 12 is inserted into the rotating hole 11. One end of the fixing bolt 12 passes through the fixing plate 9 and is threadedly connected to the threaded groove 13.

[0022] During use, when installing the lower valve seat 2 and the upper valve seat 3, the upper valve seat 2 and the lower valve seat 3 fit together, causing the upper and lower elastic rings 5 ​​to fit together. At the same time, the lower valve seat 3 moves downward and causes the threaded post 6 to pass through the sleeve hole 7, initially fixing the position between the upper valve seat 2 and the lower valve seat 3. At this time, the fixing plate 9 is inside the fixing groove 10. Then, the worker passes the fixing bolt 12 through the fixing plate 9 and screws it into the threaded groove 13 to fix the lower valve seat 2 and the upper valve seat 3 together. Then, the nut 8 rotating on the surface of the threaded post 6 applies a downward force to the upper valve seat 3, which increases the compressive force on the two elastic rings 5.

[0023] By applying a downward force to the upper valve seat 3 through the downward screwing of the nut 8, the elasticity of the rubber elastic ring 5 can be used to squeeze the two elastic rings 5 ​​together, thereby increasing the sealing between the lower valve seat 2 and the upper valve seat 3.

[0024] like Figure 1 and Figure 2As shown, a pneumatic box 14 is provided above the upper valve seat 3. A rotating shaft 15 is rotatably installed inside the pneumatic box 14. A rotating hemisphere 16 is fixed at the top of the rotating shaft 15. The rotating shaft 15 is rotatably inserted with the lower valve seat 2 and the upper valve seat 3. Flanges 17 are fitted on the surfaces of both ends of the pipe 1. Several connecting holes 18 are opened on one side of the flange 17. Connecting bolts 19 are inserted into the connecting holes 18. Sealing rings 20 are fixed at both ends of the pipe 1.

[0025] In use, the installation and fixation of the two pipes 1 are achieved by splicing two flanges 17. When the two pipes 1 are spliced ​​together, the sealing ring 20 will be squeezed between the two pipes 1. When the valve body angle inside the pipe 1 changes, the rotating hemisphere 16 will rotate synchronously with the valve body under the drive of the rotating shaft 15. Thus, the state of the valve body inside the pipe 1 can be judged according to the different color positions of the two lobes on the surface of the rotating hemisphere 16.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A detachable pneumatic shut-off valve seat sealing structure, comprising a lower valve seat (2), said lower valve seat (2) being disposed on the surface of a pipe (1), characterized in that, An upper valve seat (3) is detachably provided above the lower valve seat (2). Annular grooves (4) are respectively opened on the two sides of the lower valve seat (2) and the upper valve seat (3) that are close to each other. An elastic ring (5) is fixed inside the annular groove (4). Two threaded posts (6) are fixed on the top surface of the lower valve seat (2). Two sleeve holes (7) are opened on the top surface of the upper valve seat (3). Nuts (8) are threaded through the sleeve holes (7) of the threaded posts (6). The top surface of the lower valve seat (2) is fixed with two fixing plates (9), and the bottom surface of the upper valve seat (3) is provided with two fixing grooves (10). The fixing plates (9) and the fixing grooves (10) are slidably arranged. The surface of the upper valve seat (3) is provided with two rotating holes (11). A threaded groove (13) is provided on one side of the inside of the fixing groove (10). A fixing bolt (12) is inserted into the inside of the rotating hole (11). One end of the fixing bolt (12) passes through the fixing plate (9) and is threadedly connected to the threaded groove (13).

2. The detachable pneumatic shut-off valve seat sealing structure according to claim 1, characterized in that: A pneumatic box (14) is provided above the upper valve seat (3). A rotating shaft (15) is rotatably provided inside the pneumatic box (14). A rotating hemisphere (16) is fixed at the top of the rotating shaft (15). The rotating shaft (15) is rotatably inserted with the lower valve seat (2) and the upper valve seat (3).

3. The detachable pneumatic shut-off valve seat sealing structure according to claim 1, characterized in that: Flanges (17) are fitted on the surfaces of both ends of the pipe (1). Several connecting holes (18) are opened on one side of the flange (17), and connecting bolts (19) are inserted into the connecting holes (18).

4. The detachable pneumatic shut-off valve seat sealing structure according to claim 1, characterized in that: The two ends of the pipe (1) are respectively fixed with sealing rings (20).

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