A bellows shut-off valve

Abstract

The application relates to the field of valves, in particular to a corrugated pipe stop valve which comprises a valve body, an inlet and an outlet formed on the valve body, and a connecting hole arranged between the inlet and the outlet, an upper guide sleeve is vertically and slidably arranged in the valve body, a valve flap for plugging the connecting hole is arranged on the upper guide sleeve, a guide column is fixed to one side of the valve flap which faces the outlet, a lower guide sleeve for inserting the guide column is arranged in the connecting hole, a plurality of flow guide holes are formed between the lower guide sleeve and the connecting hole, and a sealing structure for clamping the valve flap is arranged on the lower guide sleeve. According to the scheme, even large flow can hardly cause impact vibration, thereby reducing the leakage.

Description

Technical Field

[0001] This application relates to the field of valves, and in particular to a bellows gate valve. Background Technology

[0002] Bellows gate valves have good sealing performance due to the bellows sealing structure of their valve chamber. The design of the bellows as a shielding medium element gives them obvious structural advantages.

[0003] An existing manufacturer produces a bellows gate valve with publication number CN114811061A. Its valve assembly includes a valve disc, a thrust washer, and a valve disc cover. The valve disc cover is fitted onto the lower part of the valve stem, and the thrust washer is located at the bottom end of the valve stem. The valve disc is fitted onto the valve disc cover, and the thrust washer is connected to the inner wall of the bottom end of the valve disc. The valve disc and the thrust washer work together to close the valve. When the valve stem moves downward to close the valve, the thrust washer compresses the valve disc, forcing it into the inlet pipe, thereby closing the valve and improving its sealing performance.

[0004] However, in actual production applications, it has been found that in pipelines used in large pipelines, the flow rate is very large and the large fluid impact can easily cause the valve disc to vibrate, which in turn can lead to unstable valve disc contact and leakage problems. Summary of the Invention

[0005] To reduce leakage caused by the impact and vibration of large flow rates on the valve disc, this application provides a bellows gate valve.

[0006] This application provides a bellows-type gate valve, which adopts the following technical solution:

[0007] A bellows gate valve includes a valve body, an inlet and an outlet formed on the valve body, and a connecting hole formed between the inlet and the outlet. An upper guide sleeve is vertically slidably disposed in the valve body. A valve disc for sealing the connecting hole is disposed on the upper guide sleeve. A guide post is fixed on the side of the valve disc facing the outlet. A lower guide sleeve for inserting the guide post is disposed in the connecting hole. A plurality of flow guide holes are formed between the lower guide sleeve and the connecting hole. A sealing structure for engaging the valve disc is disposed on the lower guide sleeve.

[0008] By adopting the above technical solution, by setting an upper guide sleeve and a lower guide sleeve, and when the valve disc is attached to the end face of the connecting hole, isolating the inlet and outlet, the guide post is inserted into the lower guide sleeve, so that the valve disc and the lower guide sleeve are difficult to move laterally, so that even with a large flow rate, it is difficult to cause impact vibration, thereby reducing leakage.

[0009] Optionally, the sealing structure includes a rubber ring disposed on the edge of the connecting hole facing the valve disc, a chamfer formed on the edge of the valve disc, and a sealing ring disposed on the chamfer for fitting with the rubber ring. The side wall of the guide post is wrapped with a layer of adhesive film to form an air bladder. The valve disc is provided with several sets of inflation components for inflating the air bladder. When the valve disc fits against the end face of the connecting hole, the rubber ring abuts against the sealing ring and drives the inflation components to operate, thereby pressurizing and inflating the air bladder.

[0010] By adopting the above technical solution, when the connection hole is blocked, the rubber ring fits into the sealing ring, thereby increasing the sealing performance when blocking the connection hole. At the same time, during the mutual compression between the rubber ring and the sealing ring, the inflation component is driven to operate, realizing the inflation of the airbag, making the valve disc and the lower guide sleeve more stable and less prone to vibration.

[0011] Optionally, the valve disc has an annular groove on its side wall, the sealing ring is embedded in the annular groove, the inflation assembly includes a guide rod, a spring coaxially sleeved on the guide rod, and a piston disposed at the end of the guide rod away from the annular groove. The inner wall of the annular groove has an installation groove, and the end of the installation groove away from the annular groove has an inflation chamber. The inner wall of the inflation chamber has an air guide hole and is interconnected with the airbag. One end of the guide rod is fixed to the sealing ring, and the other end extends into the inflation chamber. The spring is disposed in the installation groove, and the piston slides in the inflation chamber.

[0012] By adopting the above technical solution, in order to improve the stability of the valve disc when it is in contact with the lower guide sleeve and reduce the vibration of the valve disc, when the valve disc moves down and is in close contact with the lower guide sleeve, it squeezes the sealing ring, causing the sealing ring to deform and drive the guide rod to slide in the mounting groove, thereby compressing the spring and pushing the piston, forcing the gas in the inflation chamber into the air bag, thereby achieving the effect of pressurizing and inflating the air bag on the outside of the guide rod.

[0013] Optionally, the hardness of the rubber ring is greater than that of the sealing ring, and several sets of the inflation components are evenly spaced along the circumferential direction of the annular groove.

[0014] By adopting the above technical solution, when the rubber ring and the sealing ring come into contact with each other, it is easier for the sealing ring to be squeezed, thereby facilitating the movement of the guide rod.

[0015] Optionally, the rubber ring includes a first rubber plate disposed on the end face of the connecting hole and a second rubber plate integrally formed at the end of the first rubber plate. The second rubber plate is perpendicular to the first rubber plate, and an annular protrusion is formed at the connecting edge of the first rubber plate and the second rubber plate. In the initial state, the side of the sealing ring that extends out of the annular groove is higher than the chamfered slope.

[0016] By adopting the above technical solution, the annular protrusion increases the degree of compression on the sealing ring, thereby making it easier to push the guide rod to move.

[0017] Optionally, the side of the sealing ring that protrudes from the chamfered surface can be used as a guide surface, and the inclination of the guide surface gradually increases as the sealing ring moves downward.

[0018] By adopting the above technical solution, when sealing the connection hole, the inclination angle of the guide surface gradually increases, which causes the sealing ring to be squeezed to gradually increase, and consequently the amplitude of pushing the guide rod also increases.

[0019] Optionally, the end of the lower guide sleeve is flared, and the side of the valve disc away from the lower guide sleeve is arc-shaped.

[0020] By adopting the above technical solution, the guide post can be inserted into the lower guide sleeve more smoothly, and the arc-shaped design reduces the impact of large flow on the valve disc.

[0021] Optionally, a sealing gasket is provided on the side of the valve disc that fits against the lower guide sleeve.

[0022] By adopting the above technical solution, when the valve disc blocks the connection hole, the sealing performance between the valve disc and the lower guide sleeve is further enhanced.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] This makes it difficult for the valve disc and the lower guide sleeve to undergo lateral displacement, thus minimizing impact and vibration even with high flow rates, thereby reducing leakage; it also improves the stability of the valve disc when sealing the connection hole. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the valve body in Embodiment 1.

[0026] Figure 2 This is a partial structural diagram of the valve disc area in Embodiment 2.

[0027] Figure 3 This is a partial structural diagram of the connecting hole area in Embodiment 2.

[0028] Figure 4 This is a schematic diagram of the valve disc area in Example 2.

[0029] Figure 5 This is a schematic diagram of the structure of the rubber ring part in Example 2.

[0030] Figure 6 This is a cross-sectional view of the sealing ring in Example 2.

[0031] Reference numerals: 1. Valve body; 2. Inlet; 3. Outlet; 4. Connecting hole; 5. Upper guide sleeve; 6. Valve disc; 7. Guide post; 8. Lower guide sleeve; 9. Flow guide hole; 10. Rubber ring; 11. Chamfer; 12. Sealing ring; 13. Airbag; 14. Inflation assembly; 15. Annular groove; 16. Guide rod; 17. Spring; 18. Piston; 19. Mounting groove; 20. Inflation chamber; 21. Air guide hole; 22. First rubber plate; 23. Second rubber plate; 24. Annular protrusion; 25. Guide surface; 26. Sealing gasket. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] Example 1:

[0034] This application discloses a bellows stop valve.

[0035] Reference Figure 1 A bellows gate valve includes a valve body 1, with an outlet 3 and an inlet 2 on the valve body 1. A connecting hole 4 is provided between the inlet 2 and the outlet 3. An upper guide sleeve 5 is also provided inside the valve body 1. A valve disc 6 is fixedly installed at the end of the upper guide sleeve 5. In actual use, the valve body 1 also includes a valve stem, which is fixedly connected to the upper guide sleeve 5. The valve stem drives the upper guide sleeve 5 to move vertically up and down. When the valve disc 6 is driven to slide towards the connecting hole 4 and stick to the end face of the connecting hole 4, the valve body 1 is in a non-conductive state. Otherwise, it is in a conductive state.

[0036] Reference Figure 1 During the transportation of large-flow media, especially during the introduction of media, the large flow of media can easily impact the position of valve disc 6, causing impact vibration. This can lead to instability of the end face of valve disc 6 against the connecting hole 4, resulting in a risk of leakage. Therefore, a guide post 7 is fixed on the side of valve disc 6 facing the outlet 3, and a lower guide sleeve 8 is fixedly installed inside the connecting hole 4. When valve disc 6 blocks the connecting hole 4, the guide post 7 is inserted into the lower guide sleeve 8.

[0037] Example 2:

[0038] Reference Figure 1 and Figure 2 The difference between Embodiment 2 and Embodiment 1 is that, in order to facilitate the insertion of the guide post 7 into the lower guide sleeve 8, the port of the lower guide sleeve 8 is flared. Simultaneously, to further reduce the impact on the valve disc 6, the side of the valve disc 6 facing away from the lower guide sleeve 8 is rounded. When the valve disc 6 and the lower guide sleeve 8 are in contact, a sealing gasket 26 is provided on the side of the valve disc 6 that is in contact with the lower guide sleeve 8 to further enhance the sealing performance.

[0039] Reference Figure 1 and Figure 3 Several guide holes 9 are formed between the lower guide sleeve 8 and the inner wall of the connecting hole 4. In this embodiment, three are optimally set. When the valve disc 6 moves upward to open the connecting hole 4, it is easier for the liquid in the inlet 2 to flow into the outlet 3 through the guide holes 9.

[0040] Reference Figure 2 and Figure 4 To further enhance the stability of the valve disc 6 sealing the connection hole 4, a sealing structure for engaging the valve disc 6 is provided on the lower guide sleeve 8. The sealing structure includes a rubber ring 10, a chamfer 11, and a sealing ring 12. The chamfer 11 is formed on the side wall edge of the valve disc 6 that fits against the lower guide sleeve 8, and an annular groove 15 is formed on the inclined surface of the chamfer 11. The sealing ring 12 is installed in the annular groove 15. When the valve disc 6 moves down, the rubber ring 10 and the sealing ring 12 fit together, thereby enhancing the stability of the fit between the valve disc 6 and the lower guide sleeve 8.

[0041] Reference, 3 and Figure 4 To further reduce the vibration of valve disc 6, a layer of adhesive film is wrapped around the side wall of guide post 7, forming a cylindrical airbag 13. Guide post 7 passes through the middle of airbag 13 and is fixedly connected to airbag 13. Several inflation components 14 for inflating airbag 13 are also provided inside valve disc 6. Several inflation components 14 are evenly spaced around the axial direction of annular groove 15. When valve disc 6 is in contact with end face of connection hole 4, rubber ring 10 abuts against sealing ring 12 and drives inflation components 14 to operate and pressurize airbag 13.

[0042] Reference Figure 2 and Figure 4 The inflation assembly 14 includes a guide rod 16, a spring 17, and a piston 18. An installation groove 19 is formed on the inner wall of the annular groove 15. The guide rod 16 slides within the installation groove 19, and one end of the guide rod 16 facing the annular groove 15 is fixedly connected to the side wall of the sealing ring 12. The spring 17 is coaxially sleeved on the outside of the guide rod 16 and is located within the installation groove 19. One end of the spring 17 is fixedly connected to the inner wall of the installation groove 19, and the other end is fixedly connected to the side wall of the guide rod 16. The spring 17 is mainly used for the reset of the guide rod 16. An inflation chamber 20 is formed on the inner wall of the installation groove 19 at the end away from the annular groove 15. The inflation chamber 20 and the airbag 13 can be connected by an opening or a connecting tube. In this embodiment, the air guide hole 21 is preferred. One end of the air guide hole 21 connects to the inflation chamber 20, and the other end connects to the side wall of the guide post 7 and communicates with the inner cavity of the airbag 13.

[0043] Reference Figure 2One end of the guide rod 16, which extends into the inflation chamber 20, is fixedly connected to the piston 18, which is slidably positioned within the inflation chamber 20. When the sealing ring 12 is compressed by the rubber ring 10, the sealing ring 12 deforms, causing the guide rod 16 to slide within the mounting groove 19. The spring 17 is compressed, and the piston 18 is pushed within the inflation chamber 20, thereby delivering the gas within the inflation chamber 20 to the inner cavity of the airbag 13 through the air guide hole 21. This causes the guide post 7 to bulge, making it more difficult for relative slippage and oscillation to occur between the guide post 7 and the lower guide sleeve 8.

[0044] Reference Figure 2 and Figure 5 The hardness of the rubber ring 10 is set to be greater than that of the sealing ring 12. This makes it easier for the sealing ring 12 to deform during the mutual compression of the rubber ring 10 and the sealing ring 12, thus facilitating the sliding of the guide rod 16. To further improve inflation stability, the rubber ring 10 includes a first rubber plate 22 and a second rubber plate 23. The first rubber plate 22 is disposed on the end face of the connecting hole 4 facing the valve disc 6, and the second rubber plate 23 is disposed on the inner wall of the connecting hole 4. The first rubber plate 22 and the second rubber plate 23 are integrally formed and are set at a 90-degree angle. An annular protrusion 24 is formed at the connecting edge of the first rubber plate 22 and the second rubber plate 23. The annular protrusion 24 compresses the sealing ring 12, resulting in a larger and more pronounced pushing amplitude of the guide rod 16.

[0045] Reference Figure 2 , Figure 4 and Figure 6 To further enhance inflation stability, in the initial state, the outer side of the sealing ring 12 is configured as a protruding chamfer 11, so that the side of the sealing ring 12 extending out of the annular groove 15 is higher than the chamfer 11. The side protruding from the chamfer 11 is used as a guide surface 25, and the inclination of the guide surface 25 is set to gradually increase as the sealing ring 12 moves downward, thereby gradually increasing the inflation force as the valve disc 6 moves downward.

[0046] The implementation principle of a bellows shut-off valve in this embodiment is as follows: When it is necessary to isolate the inlet 2 and the outlet 3, the valve stem is driven to move the upper guide sleeve 5 vertically downward, causing the valve disc 6 to move vertically downward. The guide post 7 is pre-inserted into the lower guide sleeve 8 and moves downward. As the valve disc 6 continues to move downward, the annular protrusion 24 squeezes the protruding guide surface 25, causing the sealing ring 12 to deform and squeeze the guide rod 16 to slide in the mounting groove 19, thereby delivering the gas in the inflation chamber 20 to the air bag 13, causing the guide post 7 to gradually expand. When the valve disc 6 is completely in contact with the lower guide sleeve 8, the inflation volume reaches its maximum, and the valve disc 6 and the lower guide sleeve 8 are in a relatively stable state, making it difficult for them to slip vertically or laterally, thereby reducing the vibration of the valve disc 6.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bellows stop valve, comprising a valve body (1), an inlet (2) and an outlet (3) formed on the valve body (1), and a connecting hole (4) formed between the inlet (2) and the outlet (3), characterized in that: An upper guide sleeve (5) is vertically slidably disposed inside the valve body (1). A valve disc (6) for sealing the connection hole (4) is disposed on the upper guide sleeve (5). A guide post (7) is fixed on the side of the valve disc (6) facing the liquid outlet (3). A lower guide sleeve (8) for inserting the guide post (7) is disposed inside the connection hole (4). A plurality of flow guide holes (9) are formed between the lower guide sleeve (8) and the connection hole (4). A device for engaging the valve disc (6) is disposed on the lower guide sleeve (8). The sealing structure includes a rubber ring (10) disposed on the edge of the connecting hole (4) facing the valve disc (6), a chamfer (11) formed on the edge of the valve disc (6), and a sealing ring (12) disposed on the chamfer (11) for fitting with the rubber ring (10). The side wall of the guide post (7) is wrapped with a layer of adhesive film to form an airbag (13). The valve disc (6) is provided with several sets of inflation components (14) for inflating the airbag (13). When the valve disc (6) When the rubber ring (10) is in contact with the sealing ring (12) at the end face of the connecting hole (4), the rubber ring (10) abuts against the sealing ring (12) and drives the inflation assembly (14) to operate, so as to pressurize and inflate the airbag (13). The side wall of the valve disc (6) is provided with an annular groove (15), and the sealing ring (12) is embedded in the annular groove (15). The inflation assembly (14) includes a guide rod (16), a spring (17) coaxially sleeved on the guide rod (16), and a piston (18) disposed at the end of the guide rod (16) away from the annular groove (15). An installation groove (19) is provided on the inner wall of the annular groove (15). An inflation chamber (20) is provided at one end of the installation groove (19) away from the annular groove (15). An air guide hole (21) is provided on the inner wall of the inflation chamber (20) and is connected to the airbag (13). One end of the guide rod (16) is fixed to the sealing ring (12), and the other end extends into the inflation chamber (20). The spring (17) is set in the installation groove (19), and the piston (18) slides in the inflation chamber (20).

2. The bellows stop valve according to claim 1, characterized in that: The hardness of the rubber ring (10) is greater than that of the sealing ring (12), and several sets of the inflation components (14) are evenly spaced along the circumferential interval of the annular groove (15).

3. The bellows stop valve according to claim 1, characterized in that: The rubber ring (10) includes a first rubber plate (22) disposed on the end face of the connecting hole (4) and a second rubber plate (23) integrally formed at the end of the first rubber plate (22). The second rubber plate (23) is perpendicular to the first rubber plate (22), and an annular protrusion (24) is formed at the connecting edge of the first rubber plate (22) and the second rubber plate (23). In the initial state, the side of the sealing ring (12) extending out of the annular groove (15) is higher than the chamfer (11).

4. A bellows shut-off valve according to claim 3, characterized in that: The side of the sealing ring (12) protruding from the chamfer (11) is used as the guide surface (25), and the inclination of the guide surface (25) gradually increases as the sealing ring (12) moves downward.

5. A bellows shut-off valve according to claim 1, characterized in that: The end of the lower guide sleeve (8) is flared, and the side of the valve disc (6) away from the lower guide sleeve (8) is arc-shaped.

6. A bellows shut-off valve according to claim 1, characterized in that: A sealing gasket (26) is provided on the side of the valve disc (6) that is in contact with the lower guide sleeve (8).

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