Butterfly valve

Abstract

The utility model discloses a butterfly valve, and belongs to the technical field of valves. The butterfly valve comprises a valve body, a turning plate and a sealing gasket. The valve body is provided with a valve cavity, the sealing gasket is embedded in the valve cavity, and the turning plate is rotationally connected to the valve cavity. A cylindrical space is formed by the inner wall of the sealing gasket, and when the turning plate rotates till the outer wall of the turning plate abuts against the inner wall of the sealing gasket, the valve cavity is separated. And when the turning plate rotates until the outer wall of the turning plate is staggered with the inner wall of the sealing gasket, the valve cavity is communicated. The butterfly valve is fixed in the valve cavity through the sealing gasket, when the butterfly valve is in a closed state, the turning plate is connected with the valve body through the sealing gasket, and the sealing effect is guaranteed. In the process that the turning plate rotates to enable the valve cavity to be communicated, namely the opening and closing angle is adjusted, the problem that in the background technology, the edge of a sealing gasket is bent under extrusion of the valve cavity due to the fact that the sealing gasket rotates along with the turning plate is solved, and the service life of the butterfly valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a type of regulating valve used for on / off control of low-pressure pipeline media. It refers to a valve where the closing element (valve disc or butterfly plate) is a disk that rotates around a valve shaft to open and close. In pipelines, it primarily functions as a shut-off and throttling device. In complex pipeline conditions, such as real-time changes in temperature and pressure, frequent adjustments to the closing element are necessary. Furthermore, when the medium is a highly corrosive or toxic gas, the service life of the butterfly valve is significantly increased.

[0003] In related technologies, a butterfly valve includes a valve body, a connecting shaft, a flapper, and a sealing gasket. Driven by a motor, the connecting shaft rotates the flapper within the valve cavity of the valve body. The sealing gasket surrounds the outer periphery of the flapper. During operation, the motor-driven rotation of the connecting shaft adjusts the opening and closing angle of the flapper, thereby controlling the low-pressure pipeline medium. When the outer periphery of the sealing gasket abuts against the valve cavity, the butterfly valve closes, acting as a shut-off mechanism to prevent media flow.

[0004] However, when the connecting shaft rotates with the sealing gasket, the edge of the sealing gasket will be squeezed and bent against the valve cavity. Under complex working conditions, the sealing gasket is easily damaged during use, affecting the life of the butterfly valve. Utility Model Content

[0005] The purpose of this utility model is to provide a butterfly valve that prevents the edge of the sealing gasket from being squeezed and bent by the valve cavity, thereby improving reliability and extending service life.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A butterfly valve includes a valve body, a flapper, and a sealing gasket; the valve body has a valve cavity, the sealing gasket is embedded in the valve cavity, and the flapper is rotatably connected to the valve cavity; the inner wall of the sealing gasket forms a cylindrical space, and when the flapper rotates to the point where its outer wall abuts against the inner wall of the sealing gasket, the valve cavity is isolated; when the flapper rotates to the point where its outer wall is misaligned with the inner wall of the sealing gasket, the valve cavity is connected.

[0008] In some possible implementations, the valve body includes a connecting seat and a cover plate assembly detachably connected to the connecting seat, the cover plate assembly being annular and forming part of the valve cavity, and the sealing gasket being disposed on the inner sidewall of the cover plate assembly.

[0009] In some possible implementations, the cover assembly has an insert groove, the sealing gasket is embedded in the insert groove, and the sealing gasket protrudes from the inner sidewall of the cover assembly.

[0010] In some possible implementations, the cover assembly includes two fixed covers, with the sealing gasket disposed between the two fixed covers.

[0011] In some possible implementations, the butterfly valve further includes a connecting shaft, the flap being connected to the connecting shaft, the connecting shaft being rotatable about its own axis to drive the flap to rotate; the connecting seat is provided with a through hole, one end of the connecting shaft passes through the through hole, and the other end passes through the two fixing covers and the sealing gasket.

[0012] In some possible implementations, one of the connecting shaft and the flap has a through hole and the other has a blind hole. Fasteners are inserted through the through hole and the blind hole and fixedly connected to the blind hole, so that the connecting shaft and the flap are connected. When the flap rotates to the point where its outer wall abuts against the inner wall of the sealing gasket, the side with the blind hole faces the medium being blocked.

[0013] In some possible implementations, the connecting shaft is located on one side of the flap, and when the flap rotates to the point where its outer wall abuts against the inner wall of the sealing gasket, one side of the flap is used to block the medium, and the connecting shaft is located on the other side of the flap.

[0014] In some possible implementations, the fixing cover includes a first end cover, a second end cover, and a connecting ring for connecting the two. The second end covers of the two fixing covers are connected to each other by fasteners at their opposite ends and are connected to the connecting seat. The first end cover is used for connecting to an external structure.

[0015] In some possible implementations, a positioning groove is provided on the inner side of the first end cap.

[0016] In some possible implementations, the medium flows within the valve chamber in a first direction, and the height of the sealing gasket in the first direction is greater than or equal to the thickness of the flap.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a butterfly valve in which a sealing gasket is fixed inside the valve cavity. When the butterfly valve is closed, the flapper is connected to the valve body through the sealing gasket, ensuring a sealing effect. During the process of the flapper rotating to open the valve cavity, i.e., adjusting the opening angle, the problem of the sealing gasket bending under pressure from the valve cavity, as seen in the prior art, is avoided, thus improving the service life of the butterfly valve. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the butterfly valve provided in a specific embodiment of this utility model;

[0020] Figure 2 yes Figure 1 Enlarged view of point A.

[0021] In the picture:

[0022] 1. Valve body; 11. Valve cavity; 12. Connecting seat; 121. Through hole; 13. Cover plate assembly; 131. Embedded groove; 132. Fixed cover; 1321. First end cover; 13211. Positioning groove; 1322. Second end cover; 1323. Connecting ring; 2. Flip plate; 21. Blind hole; 22. Boss; 3. Sealing gasket; 4. Connecting shaft; 41. Through hole; X, First direction. Detailed Implementation

[0023] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] like Figure 1 and Figure 2As shown, this embodiment provides a butterfly valve, which includes a valve body 1, a flapper 2, and a sealing gasket 3. The valve body 1 has a valve cavity 11, the sealing gasket 3 is embedded in the valve cavity 11, and the flapper 2 is rotatably connected to the valve cavity 11. The inner side of the sealing gasket 3 forms a cylindrical space. When the flapper 2 rotates until its outer wall abuts against the inner wall of the sealing gasket 3, the valve cavity 11 is isolated, i.e., the butterfly valve is in the closed state. The sealing gasket 3 is fixed inside the valve cavity 11, and the flapper 2 is connected to the valve body 1 through the sealing gasket 3, ensuring a sealing effect. When the flapper 2 rotates until its outer wall is misaligned with the inner wall of the sealing gasket 3, the valve cavity 11 is connected, i.e., the butterfly valve is in the open state. Furthermore, when the butterfly valve is in the open state, the opening angle between the flapper 2 and the valve cavity 11 can be adjusted by adjusting the rotation angle of the flapper 2. Increasing the opening angle, i.e., the opening degree, increases the flow rate through the butterfly valve, and decreasing the opening angle, i.e., the opening degree, decreases the flow rate through the butterfly valve. During the rotation of the flap 2, the problem of the sealing gasket 3 bending under the pressure of the valve cavity 11 caused by the rotation of the flap 2 in the prior art is avoided, thus improving the service life of the butterfly valve.

[0027] The medium flows in the valve chamber 11 along the first direction X. The height of the sealing gasket 3 along the first direction X is greater than or equal to the thickness of the flapper 2, meaning the height of the cylindrical space formed by the sealing gasket 3 is greater than the thickness of the flapper 2. By increasing the height of the sealing gasket 3, it is ensured that the inner wall height of the sealing gasket 3 completely covers the outer wall thickness of the flapper 2. When the butterfly valve is closed, this ensures that the outer wall of the flapper 2 is completely pressed against the inner wall of the sealing gasket 3, guaranteeing a sealing effect. When the flapper 2 rotates, it only contacts the inner wall of the sealing gasket 3, preventing the flapper 2 from squeezing the edge of the sealing gasket 3, which could cause the edge of the sealing gasket 3 to bend due to compression and affect its service life. For epitaxial growth equipment, this greatly improves production efficiency.

[0028] The valve body 1 includes a connecting seat 12 and a cover plate assembly 13 detachably connected to the connecting seat 12. The cover plate assembly 13 is annular and forms part of the valve cavity 11. A sealing gasket 3 is disposed on the inner side wall of the cover plate assembly 13. The sealing gasket 3 is fixed to the connecting seat 12 by the cover plate assembly 13. The sealing gasket 3 can be replaced by disassembling the cover plate assembly 13 and the flip plate 2, which is convenient for disassembly and assembly.

[0029] The cover assembly 13 includes two fixed covers 132, and a sealing gasket 3 is disposed between the two fixed covers 132. When removing the sealing gasket 3, only one of the fixed covers 132 needs to be removed, reducing the number of parts to be disassembled.

[0030] The butterfly valve also includes a connecting shaft 4, to which the flap 2 is connected. The connecting shaft 4 can rotate around its own axis to drive the flap 2 to rotate. The connecting seat 12 has a through hole 121, through which one end of the connecting shaft 4 passes, and through two fixed covers 132 and a sealing gasket 3. The connecting shaft 4 is used to drive the flap 2 to rotate. Since the connecting shaft 4 passes between the two fixed covers 132, when replacing the sealing gasket 3, only one fixed cover 132 needs to be removed without disassembling the connecting shaft 4.

[0031] The cover plate assembly 13 is provided with an embedding groove 131, and the sealing gasket 3 is embedded in the embedding groove 131, with the sealing gasket 3 protruding from the inner wall of the cover plate assembly 13. The inner wall of the sealing gasket 3 protrudes from the inner wall of the cover plate assembly 13, i.e., the inner wall of the valve cavity 11, so that the flap 2 and the sealing gasket 3 are interference-fitted, improving the sealing effect. By setting the embedding groove 131, the sealing gasket 3 can be stably installed on the one hand, and the width of the embedding groove 131 can be appropriately increased, i.e., the thickness of the sealing gasket 3 can be increased, thereby improving the service life of the butterfly valve.

[0032] Of the connecting shaft 4 and the flap 2, one has a through hole 41 and the other has a blind hole 21. Fasteners pass through the through hole 41 and the blind hole 21 and are fixedly connected to the blind hole 21, thus connecting the connecting shaft 4 and the flap 2. When the flap 2 rotates until its outer wall abuts against the inner wall of the sealing gasket 3, the side with the blind hole 21 faces the blocked medium. Exemplarily, the fastener is a bolt, and the blind hole 21 is a threaded hole; the bolt and the threaded hole are threadedly connected. This avoids the need for a hole structure on the side where the medium can enter, further improving sealing reliability. Optionally, the flap 2 has a boss 22, and the threaded hole extends into the boss 22 to extend the length of the threaded hole and ensure reliable connection with the bolt.

[0033] When the flap 2 and the connecting shaft 4 are connected, there may be a gap between them. Therefore, the connecting shaft 4 is located on one side of the flap 2. When the flap 2 rotates until its outer wall abuts against the inner wall of the sealing gasket 3, one side of the flap 2 is used to block the medium, and the connecting shaft 4 is located on the other side of the flap 2. The side used to block the medium is smooth and without gaps, which improves the sealing performance.

[0034] The fixing cover 132 includes a first end cover 1321, a second end cover 1322, and a connecting ring 1323 for connecting the two. The second end cover portions 1322 of the two fixing covers 132 are connected to each other by fasteners at their respective ends and are both connected to the connecting seat 12. The second end cover portions 1322 facilitate the installation and removal of the fixing cover 132. The first end cover portion 1321 is used for installation with other structures, and can be held when installing or removing the fixing cover 132, further facilitating installation and removal. The height of the connecting ring 1323 is set according to actual needs.

[0035] The inner side of the first end cap 1321 is provided with a positioning groove 13211, which is used for positioning and installation of external structures or other structures of the butterfly valve. For example, the butterfly valve is installed on a pipeline, between two pipeline sections, and the two first end caps 1321 are respectively connected to the two pipeline sections. The pipeline passes through the fixed cover 132, and the end of the pipeline abuts against the bottom of the positioning groove 13211. The outer periphery of the pipeline fits against the groove wall of the positioning groove 13211.

[0036] The valve body 1 is used to connect a drive mechanism, such as a motor. The motor drives the flap 2 to rotate. Specifically, the motor drives the flap 2 to rotate via the drive shaft 4, thereby controlling the opening and closing of the flap 2 and thus realizing the on / off control of the medium in the pipeline. A pressure sensor is installed inside the butterfly valve. Both the pressure sensor and the motor are connected to a monitoring structure, such as a circuit board. The butterfly valve operates in two control modes: pressure control mode and opening control mode. In this embodiment, the butterfly valve is used for exhaust gas treatment in an epitaxial growth device as an example for illustrative purposes. Exhaust gas enters at the front end of the pipeline, and a vacuum pump is connected to the rear end. The first direction X is the direction of exhaust gas flow in the pipeline, such as exhaust gas flowing from the front end to the rear end of the pipeline.

[0037] For example, using pressure control mode, a preset pressure value is set for the butterfly valve. During use, the pre-installed pressure sensor first detects the actual value of the current exhaust gas pressure. If the actual value is greater than the preset pressure value, the opening of the butterfly valve's flap 2 increases, lowering the pressure in the pipeline. If the actual value is less than the preset pressure value, the opening of the butterfly valve's flap 2 decreases, raising the pressure in the pipeline. When the two values ​​are equal, the butterfly valve is in a real-time feedback regulation state, ensuring that pressure fluctuations in the pipeline remain within an acceptable range.

[0038] Silicon carbide epitaxial growth refers to the growth of a single crystal layer with specific requirements on a silicon carbide substrate. Currently, chemical vapor deposition (CVD) is the mainstream epitaxial growth process due to its advantages such as precise control of epitaxial film thickness and doping concentration, moderate growth rate, and automatic process control, making it a reliable technology for preparing high-quality silicon carbide epitaxial wafers. This embodiment also provides an epitaxial growth device, which includes a tail gas treatment component. The tail gas treatment component includes a pipe and a butterfly valve installed on the pipe. During the silicon carbide epitaxial growth process using CVD, a large amount of tail gas is generated. The tail gas treatment component controls parameters such as gas flow rate and pressure through the pipe via the butterfly valve. By improving the reliability of the butterfly valve and extending its service life, the reliability of tail gas treatment in the epitaxial growth device can be improved, reducing maintenance and increasing the production efficiency of the epitaxial growth device.

[0039] Butterfly valves can be used in epitaxial growth equipment or any other equipment without limitation.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A butterfly valve, characterized in that, The device includes a valve body (1), a flap (2), and a sealing gasket (3); the valve body (1) has a valve cavity (11), the sealing gasket (3) is embedded in the valve cavity (11), and the flap (2) is rotatably connected to the valve cavity (11); the inner wall of the sealing gasket (3) forms a cylindrical space; when the flap (2) rotates until its outer wall abuts against the inner wall of the sealing gasket (3), the valve cavity (11) is isolated; when the flap (2) rotates until its outer wall is misaligned with the inner wall of the sealing gasket (3), the valve cavity (11) is connected.

2. The butterfly valve according to claim 1, characterized in that, The valve body (1) includes a connecting seat (12) and a cover plate assembly (13) detachably connected to the connecting seat (12). The cover plate assembly (13) is annular and forms part of the valve cavity (11). The sealing gasket (3) is disposed on the inner sidewall of the cover plate assembly (13).

3. The butterfly valve according to claim 2, characterized in that, The cover plate assembly (13) is provided with an embedding groove (131), the sealing gasket (3) is embedded in the embedding groove (131), and the sealing gasket (3) protrudes from the inner sidewall of the cover plate assembly (13).

4. The butterfly valve according to claim 2, characterized in that, The cover assembly (13) includes two fixed covers (132), and the sealing gasket (3) is disposed between the two fixed covers (132).

5. The butterfly valve according to claim 4, characterized in that, The butterfly valve also includes a connecting shaft (4), the flap (2) is connected to the connecting shaft (4), the connecting shaft (4) can rotate around its own axis to drive the flap (2) to rotate; the connecting seat (12) is provided with a through hole (121), one end of the connecting shaft (4) passes through the through hole (121), and the other end passes through the two fixing covers (132) and the sealing gasket (3).

6. The butterfly valve according to claim 5, characterized in that, Of the connecting shaft (4) and the flap (2), one has a through hole (41) and the other has a blind hole (21). Fasteners are inserted through the through hole (41) and the blind hole (21) and fixedly connected to the blind hole (21) so that the connecting shaft (4) and the flap (2) are connected. When the flap (2) rotates until its outer wall abuts against the inner wall of the sealing gasket (3), the side with the blind hole (21) faces the medium that is blocked.

7. The butterfly valve according to claim 5, characterized in that, The connecting shaft (4) is located on one side of the flap (2). When the flap (2) rotates to the point where its outer wall abuts against the inner wall of the sealing gasket (3), one side of the flap (2) is used to block the medium, and the connecting shaft (4) is located on the other side of the flap (2).

8. The butterfly valve according to claim 4, characterized in that, The fixing cover (132) includes a first end cover (1321), a second end cover (1322), and a connecting ring (1323) for connecting the two. The second end cover (1322) of the two fixing covers (132) are connected to each other by fasteners and are both connected to the connecting seat (12). The first end cover (1321) is used to connect to the external structure.

9. The butterfly valve according to claim 8, characterized in that, The inner side of the first end cap (1321) is provided with a positioning groove (13211).

10. The butterfly valve according to any one of claims 1-9, characterized in that, The medium flows in the valve chamber (11) along a first direction (X), and the height of the sealing gasket (3) along the first direction (X) is greater than or equal to the thickness of the flap (2).

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