A seal butterfly valve

Abstract

The utility model belongs to valve technical field, specifically discloses a kind of sealing butterfly valve, including valve body, the inside rotation of valve body is connected with the valve stem of the valve body penetration, the top of valve stem is fixedly connected with hand wheel, the surface of valve stem is fixedly connected with butterfly plate, butterfly plate is located in the inside of valve body, the outer circumferential surface of butterfly plate is equipped with ring groove, the inside of ring groove is provided with second sealing gasket, the outer circumferential surface of second sealing gasket and the inner wall of valve body are contacted, the inside of butterfly plate is equipped with multiple circularly arranged sector groove, the inside of sector groove is connected with the inside of ring groove, the inside of sector groove is slidably connected with sector plate, the outer circumferential surface of sector plate and the inner circumferential surface of second sealing gasket are contacted, by the impact force brought by medium in pipeline, make sector plate to second sealing gasket outwardly support extrusion, then the gap generated by second sealing gasket damage part is filled, to guarantee the sealing property of butterfly valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a sealing butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve whose closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. Butterfly valves mainly serve the functions of shut-off and throttling in pipelines.

[0003] Currently, some butterfly valves on the market suffer from damage to the sealing gasket between the valve body and the butterfly plate due to friction, media corrosion, and other factors after prolonged use. This damage affects the sealing performance of the butterfly valve, causing leakage even when the valve is closed. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing butterfly valve to solve the problem mentioned in the background art that the sealing gasket between the valve body and the butterfly plate is damaged due to friction, media corrosion and other factors, which affects the sealing performance of the butterfly valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing butterfly valve, comprising a valve body, a valve stem rotatably connected inside the valve body, a handwheel fixedly connected to the top of the valve stem, a butterfly plate fixedly connected to the surface of the valve stem, the butterfly plate being located inside the valve body, an annular groove formed on the outer circumferential surface of the butterfly plate, a second sealing gasket disposed inside the annular groove, the outer circumferential surface of the second sealing gasket contacting the inner wall of the valve body, a plurality of circumferentially arranged fan-shaped grooves formed inside the butterfly plate, the interior of the fan-shaped grooves communicating with the interior of the annular grooves, a fan-shaped plate slidably connected inside the fan-shaped grooves, the outer circumferential surface of the fan-shaped plate contacting the inner circumferential surface of the second sealing gasket.

[0006] Preferably, the surface of the butterfly plate has a groove, the interior of the butterfly plate has a sliding groove, the interior of the groove is connected to the interior of the sliding groove, and the interior of the sliding groove is connected to the interior of the fan-shaped groove.

[0007] Preferably, a limiting plate is slidably connected inside the groove.

[0008] Preferably, a spring is fixedly connected to the side of the limiting plate away from the groove opening, and the side of the spring away from the limiting plate is fixedly connected to the inside of the slide groove.

[0009] Preferably, a connecting post is fixedly connected to the side of the limiting plate near the groove, and a compression ring is fixedly connected to the surface of the connecting post, and the surface of the connecting post is slidably connected to the inside of the groove.

[0010] Preferably, the opposite sides of the extrusion ring and the sector plate are both set as arc surfaces.

[0011] Preferably, a pushing circular plate is fixedly connected to the side of the connecting column away from the limiting plate, and a connecting member is fixedly connected to the side of the pushing circular plate near the butterfly plate. The side of the butterfly plate near the connecting member is conical, and the interior of the connecting member is slidably connected to the conical surface of the butterfly plate.

[0012] Preferably, a first sealing gasket is fixedly connected to the side of the connector away from the pushing circular plate.

[0013] Preferably, the side of the push plate away from the connecting column is concave.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This sealing butterfly valve utilizes the impact force of the medium in the pipeline to move the pusher plate towards the butterfly plate. The movement of the pusher plate causes the connecting column to slide into the groove. The movement of the connecting column causes the extrusion ring to move. During the movement of the extrusion ring, the surface of the sector plate is extruded, causing the sector plate to slide towards the second sealing gasket. This allows the sector plate to support and extrude the second sealing gasket outward, filling the gap caused by the damaged part of the second sealing gasket. The extrusion force increases with the increase of the impact force of the medium, ensuring that the outer circumferential surface of the second sealing gasket is in close contact with the inner wall of the valve body, thereby ensuring the sealing performance of the butterfly valve.

[0015] 2. This sealing butterfly valve rotates by turning the handwheel, which in turn rotates the valve stem. The rotation of the valve stem, in turn, rotates the butterfly plate, which in turn rotates the push plate. When the angle of the push plate shifts, the impact force of the medium on its surface decreases. At this time, under the influence of the spring force, the limit plate moves the connecting column away from the butterfly plate, thereby causing the compression ring to lose its compression on the sector plate. This prevents the sector plate from compressing the second sealing gasket, thus reducing the friction between the second sealing gasket and the valve body. This avoids damage to the second sealing gasket due to excessive friction during rotation and increases the service life of the butterfly valve. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of a sealing butterfly valve according to the present invention; Figure 2 This is a schematic diagram of the structure of the butterfly plate of this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5This is a schematic diagram of the structure of the sector-shaped plate of this utility model; Figure 6 This is a schematic diagram of the structure of the push-press circular plate of this utility model.

[0017] In the diagram: 1. Valve body; 2. Valve stem; 3. Handwheel; 4. Pushing disc; 5. Connecting piece; 6. First sealing gasket; 7. Connecting column; 8. Extrusion ring; 9. Limiting plate; 10. Spring; 11. Butterfly plate; 12. Ring groove; 13. Second sealing gasket; 14. Sector groove; 15. Sector plate; 16. Slide groove; 17. Groove opening. Detailed Implementation

[0018] Please see Figure 1-6 The present invention provides a technical solution: a sealing butterfly valve, comprising a valve body 1, a valve stem 2 rotatably connected inside the valve body 1, a handwheel 3 fixedly connected to the top of the valve stem 2, and a butterfly plate 11 fixedly connected to the surface of the valve stem 2. The butterfly plate 11 is located inside the valve body 1, and an annular groove 12 is formed on the outer circumferential surface of the butterfly plate 11. A second sealing gasket 13 is provided inside the annular groove 12. The outer circumferential surface of the second sealing gasket 13 contacts the inner wall of the valve body 1 to ensure the sealing performance of the butterfly valve.

[0019] Furthermore, the butterfly plate 11 has multiple circumferentially arranged fan-shaped grooves 14 inside, the inside of the fan-shaped grooves 14 is connected to the inside of the annular groove 12, and a fan-shaped plate 15 is slidably connected inside the fan-shaped grooves 14. The outer circumferential surface of the fan-shaped plate 15 is in contact with the inner circumferential surface of the second sealing gasket 13.

[0020] Furthermore, the surface of the butterfly plate 11 is provided with a slot 17, and the interior of the butterfly plate 11 is provided with a sliding groove 16. The interior of the slot 17 is connected to the interior of the sliding groove 16, and the interior of the sliding groove 16 is connected to the interior of the sector groove 14. A limiting plate 9 is slidably connected inside the sliding groove 16. A spring 10 is fixedly connected to the side of the limiting plate 9 away from the slot 17. The side of the spring 10 away from the limiting plate 9 is fixedly connected to the interior of the sliding groove 16. A connecting post 7 is fixedly connected to the side of the limiting plate 9 near the slot 17. A compression ring 8 is fixedly connected to the surface of the connecting post 7. The opposite sides of the compression ring 8 and the sector plate 15 are both set as arc surfaces to simultaneously compress multiple sector plates 15 outwards. This causes the sector plates 15 to slide outwards while compressing the second sealing gasket 13, thereby ensuring that the outer circumferential surface of the second sealing gasket 13 is in close contact with the inner wall of the valve body 1, thus ensuring the sealing performance of the butterfly valve.

[0021] Furthermore, the surface of the connecting column 7 is slidably connected to the inside of the groove 17. A pushing circular plate 4 is fixedly connected to the side of the connecting column 7 away from the limiting plate 9. The side of the pushing circular plate 4 away from the connecting column 7 is set as a concave surface to increase the impact force of the medium on the pushing circular plate 4. A connecting piece 5 is fixedly connected to the side of the pushing circular plate 4 near the butterfly plate 11. The side of the butterfly plate 11 near the connecting piece 5 is conical. The inside of the connecting piece 5 is slidably connected to the conical surface of the butterfly plate 11. A first sealing gasket 6 is fixedly connected to the side of the connecting piece 5 away from the pushing circular plate 4. The movement of the pushing circular plate 4 drives the connecting piece 5 to move. The movement of the connecting piece 5 drives the first sealing gasket 6 to move towards the side of the second sealing gasket 13 and squeezes the second sealing gasket 13. When the second sealing gasket 13 is supported outward by the fan-shaped plate 15, it narrows and a gap is generated between it and the annular groove 12, which is squeezed and filled by the first sealing gasket 6, further ensuring the sealing performance of the device.

[0022] Working Principle: For this type of sealing butterfly valve, when the second sealing gasket 13 is damaged due to friction, media corrosion, or other factors, the impact force from the medium in the pipeline causes the pushing disc 4 to move towards the butterfly plate 11. The movement of the pushing disc 4 drives the connecting column 7 to slide into the groove 16. The movement of the connecting column 7 drives the compression ring 8 to move. During the movement of the compression ring 8, it compresses the surface of the sector plate 15, causing the sector plate 15 to slide towards the second sealing gasket 13. This allows the sector plate 15 to support and compress the second sealing gasket 13 outwards, filling the gap created by the damaged portion of the second sealing gasket 13. The compressive force increases with... As the impact force of the medium increases, the pressure increases, thus ensuring that the outer circumferential surface of the second sealing gasket 13 is in close contact with the inner wall of the valve body 1, thereby guaranteeing the sealing performance of the butterfly valve. At the same time, the movement of the pushing circular plate 4 drives the connecting piece 5 to move. The movement of the connecting piece 5 drives the first sealing gasket 6 to move to one side of the second sealing gasket 13 and squeezes the second sealing gasket 13. The squeezing force of the first sealing gasket 6 on the second sealing gasket 13 also increases as the impact force of the medium increases. When the second sealing gasket 13 is supported outward by the fan-shaped plate 15, the gap between it and the annular groove 12 is created due to the narrowing, which is squeezed and filled by the first sealing gasket 6, further ensuring the sealing performance of the device.

[0023] When the operator opens the valve, the handwheel 3 is turned to rotate the valve stem 2, which in turn rotates the butterfly plate 11. The butterfly plate 11 then rotates the push plate 4. When the angle of the push plate 4 shifts, the impact force of the medium on its surface decreases. At this time, the spring force of the spring 10 causes the limiting plate 9 to move the connecting column 7 away from the butterfly plate 11, thereby causing the compression ring 8 to lose its compression on the sector plate 15. This prevents the sector plate 15 from compressing the second sealing gasket 13, thus reducing the friction between the second sealing gasket 13 and the inside of the valve body 1. This prevents the second sealing gasket 13 from being damaged due to excessive friction during rotation, increasing the service life of the butterfly valve.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0025] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A sealing butterfly valve, comprising a valve body (1), characterized in that: The valve body (1) is rotatably connected to a valve stem (2) that passes through the valve body (1). A handwheel (3) is fixedly connected to the top of the valve stem (2). A butterfly plate (11) is fixedly connected to the surface of the valve stem (2). The butterfly plate (11) is located inside the valve body (1). An annular groove (12) is opened on the outer circumferential surface of the butterfly plate (11). A second sealing gasket (13) is provided inside the annular groove (12). The outer circumferential surface of the second sealing gasket (13) is in contact with the inner wall of the valve body (1). A plurality of fan-shaped grooves (14) arranged in a circle are opened inside the butterfly plate (11). The inside of the fan-shaped grooves (14) is connected to the inside of the annular grooves (12). A fan-shaped plate (15) is slidably connected inside the fan-shaped grooves (14). The outer circumferential surface of the fan-shaped plate (15) is in contact with the inner circumferential surface of the second sealing gasket (13).

2. A sealing butterfly valve according to claim 1, characterized in that: The surface of the butterfly plate (11) is provided with a groove (17), and the inside of the butterfly plate (11) is provided with a sliding groove (16). The inside of the groove (17) is connected to the inside of the sliding groove (16), and the inside of the sliding groove (16) is connected to the inside of the fan-shaped groove (14).

3. A sealing butterfly valve according to claim 2, characterized in that: The sliding groove (16) is internally connected to a limiting plate (9).

4. A sealing butterfly valve according to claim 3, characterized in that: A spring (10) is fixedly connected to the side of the limiting plate (9) away from the groove (17), and the side of the spring (10) away from the limiting plate (9) is fixedly connected to the inside of the slide groove (16).

5. A sealing butterfly valve according to claim 4, characterized in that: The limiting plate (9) is fixedly connected to a connecting column (7) on the side near the slot (17), and a compression ring (8) is fixedly connected to the surface of the connecting column (7). The surface of the connecting column (7) is slidably connected to the inside of the slot (17).

6. A sealing butterfly valve according to claim 5, characterized in that: The opposite sides of the extrusion ring (8) and the sector plate (15) are both set as arc surfaces.

7. A sealing butterfly valve according to claim 5, characterized in that: The side of the connecting column (7) away from the limiting plate (9) is fixedly connected to a pushing round plate (4), and the side of the pushing round plate (4) near the butterfly plate (11) is fixedly connected to a connector (5). The side of the butterfly plate (11) near the connector (5) is conical, and the interior of the connector (5) is slidably connected to the conical surface of the butterfly plate (11).

8. A sealing butterfly valve according to claim 7, characterized in that: The first sealing gasket (6) is fixedly connected to the side of the connector (5) away from the push plate (4).

9. A sealing butterfly valve according to claim 7, characterized in that: The side of the push plate (4) away from the connecting column (7) is concave.

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