Eccentric butterfly valve

Abstract

The utility model discloses an eccentric butterfly valve which comprises a valve body, a valve shaft and a valve plate, a valve cavity is formed in the valve body, the valve cavity forms an inlet and an outlet on the two end faces of the valve body respectively, the valve shaft is rotatably arranged on the valve body in a penetrating mode, the valve plate is a circular plate, is arranged in the valve cavity of the valve body and is connected with the valve shaft, and the valve shaft is used for driving the valve plate to rotate. A first sealing wall and a second sealing wall are formed on the inner wall of the valve body, the first sealing wall and the second sealing wall extend towards the first end and the second end of the valve body respectively, the first sealing wall and the second sealing wall are arc-shaped inclined walls inclining towards the center of the valve body, and the valve plate is in sealing contact with the first sealing wall and the second sealing wall respectively. The first sealing wall and the second sealing wall which are matched with the valve plate are arranged in the valve body, the first sealing wall and the second sealing wall are designed to be the arc-shaped inclined walls, interference fit can be formed between the first sealing wall and the second sealing wall and the valve plate, and sealing failure between the valve plate and the valve body can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, and more specifically, to an eccentric butterfly valve. Background Art

[0002] Butterfly valves are widely used in water supply and drainage systems such as water plants, power plants, steel smelting, and environmental facilities, especially eccentric butterfly valves. In many application scenarios, they need to bear a certain water pressure. The sealing reliability between the valve plate and the valve body of existing butterfly valves is relatively poor, and the sealing performance will decrease with the use of the butterfly valve. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model innovatively provides an eccentric butterfly valve, which can improve the sealing reliability of the butterfly valve.

[0004] In order to achieve the above technical objectives, the utility model discloses an eccentric butterfly valve, including a valve body, a valve shaft and a valve plate. The valve body is formed with a valve cavity, and the valve cavity forms an inlet and an outlet at both end surfaces of the valve body respectively. The valve shaft is rotatably arranged on the valve body. The valve plate is a circular plate, which is arranged in the valve cavity of the valve body and connected to the valve shaft. The valve shaft is used to drive the valve plate to rotate.

[0005] The inner wall of the valve body is formed with a first sealing wall and a second sealing wall, the first sealing wall and the second sealing wall are respectively located on both sides of the valve shaft, and the first sealing wall and the second sealing wall are respectively extended toward the first end and the second end of the valve body.

[0006] The first sealing wall and the second sealing wall are both arc-shaped inclined walls inclined toward the center of the valve body, and the valve plate forms sealing contact with the first sealing wall and the second sealing wall respectively.

[0007] Furthermore, the radius of the first sealing wall and the second sealing wall gradually decreases along the extension direction, and the radial dimensions of the small opening ends of the first sealing wall and the second sealing wall are smaller than the radial dimension of the valve plate.

[0008] Furthermore, a rubber coating layer is provided on the valve plate, and the rubber coating layer at least covers the first wall surface of the valve plate and the side wall surface of the valve plate.

[0009] Further, a connecting block is provided on the second wall surface of the valve plate, the connecting block extends along the radial direction of the valve plate, and a connecting through hole is formed on the connecting block.

[0010] The inner wall surface of the connecting through hole is a multi-faceted structure.

[0011] Furthermore, the valve shaft is provided with a first rotation connection section, a first drive connection section, a second rotation connection section and a second drive connection section along its axial direction, wherein:

[0012] The outer wall surfaces of the first rotating connection section and the second rotating connection section are cylindrical surfaces, which are used to form a rotating connection with the valve body.

[0013] A first drive connection section is formed between the first rotation connection section and the second rotation connection section, the second drive connection section is formed at a first end of the valve shaft, and the second rotation connection section is located between the first drive connection section and the second drive connection section.

[0014] The first drive connection section is used to connect with the connecting through hole on the valve plate, and the outer wall surface of the first drive connection section is a multi-faceted structure.

[0015] The outer wall surface of the second driving connection section is a multi-faceted structure, which is used to be connected to the operating handle.

[0016] Furthermore, the eccentric butterfly valve further comprises a locking structure, which comprises a bracket, a locking bolt and a locking plate, wherein:

[0017] The bracket is fixedly arranged on the valve body, a connecting hole perpendicular to the valve shaft is formed on the bracket, an internal thread is formed on the inner wall of the connecting hole, and the locking bolt is threadedly connected to the connecting hole.

[0018] The locking plate is fixedly connected to the second driving connection section of the valve shaft, and the locking bolt can be pressed against the locking plate by rotating to fix the position of the locking plate.

[0019] Furthermore, both end surfaces of the valve body are provided with a first connecting hole and a second connecting hole, the first connecting hole is a threaded hole, the second connecting hole is a smooth hole, and a plurality of the first connecting hole and a plurality of the second connecting hole are provided.

[0020] The beneficial effects of the utility model are:

[0021] The eccentric butterfly valve provided by the utility model has a first sealing wall and a second sealing wall matched with the valve plate arranged in the valve body, and the first sealing wall and the second sealing wall are designed to be arc-shaped inclined walls to form an interference fit with the valve plate, thereby avoiding sealing failure between the valve plate and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of an eccentric butterfly valve according to an embodiment of the utility model is shown;

[0023] Figure 2 The structure diagram of the eccentric butterfly valve of the embodiment of the utility model is shown (partial cross-section of the valve body);

[0024] Figure 3 A cross-sectional schematic diagram of an eccentric butterfly valve according to an embodiment of the utility model is shown.

[0025] In the figure,

[0026] 1. Valve body; 11. Valve cavity; 111. First sealing wall; 12. First connecting hole; 13. Second connecting hole; 2. Valve shaft; 21. First rotating connecting section; 22. First driving connecting section; 23. Second rotating connecting section; 24. Second driving connecting section; 3. Valve plate; 4. Operating handle; 5. Locking bolt; 6. Bracket; 7. Locking plate. DETAILED DESCRIPTION

[0027] The eccentric butterfly valve provided by the utility model is explained and illustrated in detail below in conjunction with the drawings in the specification.

[0028] The eccentric butterfly valve provided by the utility model has a first sealing wall and a second sealing wall in the valve body that cooperate with the valve plate, and the first sealing wall and the second sealing wall are designed as arc-shaped inclined walls to form an interference fit with the valve plate, thereby avoiding sealing failure between the valve plate and the valve body. In addition, the sealing reliability can be further improved by covering the valve plate with a rubber coating. The utility model is described in detail in combination with specific embodiments below:

[0029] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the utility model provides an eccentric butterfly valve, including a valve body 1, a valve shaft 2 and a valve plate 3. A valve cavity 11 is formed on the valve body 1. The valve cavity 11 is respectively formed with an inlet and an outlet on both end surfaces of the valve body 1. Fluid can flow through the valve cavity 11. The valve shaft 2 is rotatably arranged on the valve body 1. Optionally, the valve shaft 2 is arranged perpendicular to the valve cavity 11, and a part of the valve shaft 2 is located in the valve cavity 11. The valve plate 3 is a circular plate with a certain thickness. The valve plate 3 is rotatably arranged in the valve cavity 11 of the valve body 1 and is connected to the valve shaft 2. The valve shaft 2 is used to drive the valve plate 3 to rotate to control the opening and closing of the valve cavity 11.

[0030] In this embodiment, if Figure 3As shown, the inner wall of the valve body 1 is formed with a first sealing wall 111 and a second sealing wall (not shown in the figure), the first sealing wall 111 and the second sealing wall are respectively located on both sides of the valve shaft 2, and the first sealing wall 111 and the second sealing wall are respectively extended toward the first end and the second end of the valve body 1, that is, when the valve plate 3 closes the valve cavity 11, the first sealing wall 111 and the second sealing wall are respectively located on both sides of the valve plate 3. The first sealing wall 111 and the second sealing wall are both arc-shaped inclined walls inclined toward the center of the valve body 1, and the valve plate 3 forms a sealing contact with the first sealing wall 111 and the second sealing wall respectively. Optionally, the radius of the first sealing wall 111 and the second sealing wall gradually decreases along the extension direction, and the radial size of the small end of the first sealing wall 111 and the second sealing wall is smaller than the radial size of the valve plate 3. The valve plate 3 can simultaneously form a sealing contact with the first sealing wall 111 and the second sealing wall by rotating. Since the radial size of the first sealing wall 111 and the second sealing wall gradually decreases, a certain amount of interference fit is formed between the first sealing wall 111 and the second sealing wall and the valve plate 3 to ensure the reliability of the seal.

[0031] In this embodiment, at least the first sealing wall 111 and the second sealing wall of the inner wall of the valve cavity 11 are polished to make them more elastic and have a smaller resistance distance, thereby preventing extrusion and scratching and ensuring the reliability of the seal.

[0032] In one embodiment, a rubber coating is provided on the valve plate 3, and the rubber coating at least covers the first wall surface of the valve plate 3 and the side wall surface of the valve plate 3. When the valve plate 3 closes the valve cavity 11, the rubber coating forms a sealing contact with the first sealing wall 111 and the second sealing wall, thereby improving the sealing effect. Optionally, the rubber coating on the first wall surface and the side wall surface of the valve plate 3 is formed in one piece, which can effectively prevent the rubber coating from falling off. In this embodiment, the rubber coating is made of NBR (Nitrile Butadiene Rubber) vulcanized on the valve plate 3 after high temperature treatment.

[0033] Optionally, a connecting block is provided on the second wall surface of the valve plate 3, the connecting block extends along the radial direction of the valve plate 3, a connecting through hole is formed on the connecting block, and the inner wall surface of the connecting through hole is a multi-faceted structure. Figure 3As shown, the valve shaft 2 is provided with a first rotating connection section 21, a first driving connection section 22, a second rotating connection section 23 and a second driving connection section 24 along its axial direction. The outer wall surfaces of the first rotating connection section 21 and the second rotating connection section 23 are cylindrical surfaces, which are used to form a rotating connection with the valve body 1. The first driving connection section 22 is formed between the first rotating connection section 21 and the second rotating connection section 23. The second driving connection section 24 is formed at the first end of the valve shaft 2, and the second rotating connection section 23 is located between the first driving connection section 22 and the second driving connection section 24. The first driving connection section 22 is used to connect with the connecting through hole on the valve plate 3. The outer wall surface of the first driving connection section 22 is a multi-faceted structure. The outer wall surface of the second driving connection section 24 is a multi-faceted structure, which is used to connect with the operating handle 4.

[0034] In this embodiment, the side circumferential wall of the first rotating connecting section 21 is a six-sided structure. Correspondingly, the inner circumferential wall of the connecting hole formed on the connecting block on the valve plate 3 is a six-sided structure. The first rotating connecting section 21 and the connecting hole are plugged in to transmit torque, so that the valve shaft 2 can drive the valve plate 3 to rotate. This can reduce the setting of the connecting parts between the valve shaft 2 and the valve plate 3, making the overall structure simpler.

[0035] Optionally, the side wall of the second rotating connecting section 23 is also a six-sided structure. Correspondingly, one end of the operating handle 4 is formed with a connecting hole matching the shape of the second rotating connecting section 23 and is fixedly connected to the second connecting section. The operating handle 4 can control the rotation of the rotating shaft, thereby controlling the opening and closing of the valve chamber 11.

[0036] In one embodiment, the eccentric butterfly valve further includes a locking structure, such as Figure 2 As shown, the locking structure includes a locking bolt 5, a bracket 6 and a locking plate 7. The bracket 6 is fixedly arranged on the valve body 1, and a connecting hole perpendicular to the valve shaft 2 is formed on the bracket 6, and an internal thread is formed on the inner wall of the connecting hole, and the locking bolt 5 is threadedly connected to the connecting hole. Optionally, the bracket 6 includes a connecting section and a supporting section perpendicular to each other, and the connecting section can be fixedly connected to the side wall of the valve body 1 by welding or the like, and the supporting section is arranged parallel to the valve shaft 2. A connecting hole is formed on the supporting section, and the locking bolt 5 is threadedly connected to the connecting hole. The locking plate 7 is fixedly connected to the second driving connecting section 24 of the valve shaft 2 and rotates synchronously with the valve shaft 2. Optionally, the locking plate 7 is a polygonal thin plate, and the locking bolt 5 can be abutted against the side of the locking plate 7 by rotating, so as to prevent the locking plate 7 from rotating, fix the position of the locking plate 7, and then make the valve shaft 2 unable to rotate, so as to prevent the valve plate 3 from rotating due to accidental touch, causing inadequate or excessive opening or closing.

[0037] In one embodiment, Figure 2As shown, the two end faces of the valve body 1 are provided with a first connection hole 12 and a second connection hole 13, the first connection hole 12 is a threaded hole, the second connection hole 13 is a smooth hole, and a plurality of the first connection hole 12 and the second connection hole 13 are provided. The first connection hole 12 can be connected to the port on the water pump or other equipment by bolts, and the second connection hole 13 can be used to connect with the flange on the connecting pipe, so that the valve body 1 can be set between two sections of the pipe. The provision of the first connection hole 12 and the second connection hole 13 enriches the connection scenarios of the valve body 1 and has a wider range of applications.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention shall be included in the protection scope of the present invention.

Claims

1. An eccentric butterfly valve, comprising a valve body, a valve shaft and a valve plate, characterized in that: The valve body is formed with a valve cavity, and the valve cavity forms an inlet and an outlet at both end surfaces of the valve body respectively. The valve shaft is rotatably arranged on the valve body. The valve plate is a circular plate, which is arranged in the valve cavity of the valve body and connected to the valve shaft. The valve shaft is used to drive the valve plate to rotate. The inner wall of the valve body is formed with a first sealing wall and a second sealing wall, the first sealing wall and the second sealing wall are respectively located on both sides of the valve shaft, and the first sealing wall and the second sealing wall are respectively extended toward the first end and the second end of the valve body. The first sealing wall and the second sealing wall are both arc-shaped inclined walls inclined toward the center of the valve body, and the valve plate forms sealing contact with the first sealing wall and the second sealing wall respectively.

2. The eccentric butterfly valve according to claim 1, characterized in that: The radius of the first sealing wall and the second sealing wall gradually decreases along the extension direction, and the radial dimensions of the small opening ends of the first sealing wall and the second sealing wall are smaller than the radial dimension of the valve plate.

3. The eccentric butterfly valve according to claim 2, characterized in that: The valve plate is provided with a rubber coating layer, and the rubber coating layer at least covers the first wall surface of the valve plate and the side wall surface of the valve plate.

4. The eccentric butterfly valve according to claim 3, characterized in that: A connecting block is arranged on the second wall surface of the valve plate, the connecting block extends along the radial direction of the valve plate, and a connecting through hole is formed on the connecting block. The inner wall surface of the connecting through hole is a multi-faceted structure.

5. The eccentric butterfly valve according to claim 4, characterized in that: The valve shaft is provided with a first rotation connection section, a first drive connection section, a second rotation connection section and a second drive connection section along its axial direction, wherein: The outer wall surfaces of the first rotating connection section and the second rotating connection section are cylindrical surfaces, which are used to form a rotating connection with the valve body. A first drive connection section is formed between the first rotation connection section and the second rotation connection section, the second drive connection section is formed at a first end of the valve shaft, and the second rotation connection section is located between the first drive connection section and the second drive connection section. The first drive connection section is used to connect with the connecting through hole on the valve plate, and the outer wall surface of the first drive connection section is a multi-faceted structure. The outer wall surface of the second driving connection section is a multi-faceted structure, which is used to be connected to the operating handle.

6. The eccentric butterfly valve according to claim 5, characterized in that: The eccentric butterfly valve further comprises a locking structure, which comprises a bracket, a locking bolt and a locking plate, wherein: The bracket is fixedly arranged on the valve body, a connecting hole perpendicular to the valve shaft is formed on the bracket, an internal thread is formed on the inner wall of the connecting hole, and the locking bolt is threadedly connected to the connecting hole. The locking plate is fixedly connected to the second driving connection section of the valve shaft, and the locking bolt can be pressed against the locking plate by rotating to fix the position of the locking plate.

7. The eccentric butterfly valve according to any one of claims 1 to 6, characterized in that: The two end surfaces of the valve body are provided with a first connecting hole and a second connecting hole, the first connecting hole is a threaded hole, the second connecting hole is a smooth hole, and a plurality of the first connecting hole and a plurality of the second connecting hole are provided.

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