Bidirectional hard sealing butterfly valve with elastic valve seat

Abstract

The utility model discloses a bidirectional hard sealing butterfly valve with an elastic valve seat, and belongs to the technical field of butterfly valves. Comprising a support, a valve body, a valve rod and a valve seat sealing ring. A valve body is arranged below the bracket; the upper end of the valve rod is vertically inserted into the valve body from the bracket and reaches below the valve body; the valve rod can rotate relative to the support and the valve body. A butterfly plate is arranged at the part of the valve rod in the valve cavity of the valve body; the valve rod rotates to drive the butterfly plate to rotate synchronously; a valve seat sealing ring is arranged in the valve body; the contact face of the valve seat sealing ring and the butterfly plate is of an arc-shaped flange structure. The contact side face of the butterfly plate and the valve body is an arc face. The valve seat sealing ring with the arc-shaped flange is arranged in the valve body, so that bidirectional sealing of the butterfly valve can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of butterfly valves, and in particular relates to a bidirectional hard-sealed butterfly valve with an elastic valve seat. Background Art

[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 gate valve with a disc as the closing member, which rotates around the valve axis to open and close. It can be used to control air, water, steam and various corrosive media.

[0003] Commonly used single-eccentric hard-sealed butterfly valves are usually one-way sealing butterfly valves. An arrow on the valve body indicates the direction of medium flow, so pay attention to the medium flow direction during valve installation. When the butterfly valve disc is closed, it can only withstand pressure on one side. If pressure is also applied on the other side, leakage may occur. Utility Model Content

[0004] The utility model provides a two-way hard-sealed butterfly valve with an elastic valve seat, in which a valve seat is arranged on the side wall of the valve cavity of the valve body through an embedded part, and the valve seat is in the form of an arc-shaped flange structure, and the contact surface of the butterfly plate that contacts the valve seat is also in the form of an arc surface; when the butterfly plate is in a closed state, the valve seat with the arc-shaped flange structure contacts the butterfly plate and deforms to achieve sealing; when the direction of fluid pressure impacts the butterfly plate, the arc surface of the butterfly plate contacts the arc-shaped valve seat, and the butterfly plate squeezes the valve seat, and the arc-shaped valve seat has a sufficiently large deformation and fitting range to make the seal tighter; when the direction of fluid pressure impacts the valve seat itself, the valve seat itself fits the arc surface of the butterfly plate due to elastic deformation to achieve sealing; thus, by arranging a valve seat sealing ring with an arc-shaped flange in the valve body, two-way sealing of the butterfly valve can be achieved.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A bidirectional hard-sealed butterfly valve with an elastic valve seat comprises: a bracket, a valve body, a valve stem and a valve seat sealing ring;

[0007] A valve body is provided below the bracket;

[0008] The lower end of the valve stem is vertically inserted into the valve body from the bracket to reach the bottom of the valve body; the valve stem is rotatable relative to the bracket and the valve body;

[0009] A butterfly plate is provided on the valve stem; the butterfly valve is located in the valve cavity of the valve body;

[0010] The rotation of the valve stem drives the butterfly plate to rotate synchronously;

[0011] A valve seat sealing ring is arranged in the valve body;

[0012] The contact portion between the valve seat sealing ring and the butterfly plate is an arc-shaped flange structure;

[0013] The contact side surface of the butterfly plate and the valve seat sealing ring is an arc surface.

[0014] Preferably, the portion of the valve seat sealing ring away from the butterfly plate is in a straight structure, and the portion in contact with the butterfly plate is in an arc flange structure.

[0015] Preferably, the 1 / 2 portion of the valve seat sealing ring away from the butterfly plate is in a straight structure, and the 1 / 2 portion close to the butterfly plate is in an "S" curved structure.

[0016] Preferably, the valve seat sealing ring is arranged at a position close to one side in the valve cavity of the valve body; and the side surface of the butterfly plate in contact with the valve seat sealing ring is an arc surface.

[0017] Preferably, a metal wound gasket is wound around one end of the valve seat sealing ring away from the butterfly plate; and then the valve seat sealing ring is fixedly arranged on the valve body by an insert.

[0018] Preferably, an embedding groove consistent with the curved structure of the valve seat sealing ring is provided on a side of the insert that contacts the valve seat sealing ring.

[0019] Preferably, a packing assembly is provided at the junction of the valve body and the bracket;

[0020] The packing assembly is used to seal the connection between the bracket and the valve body.

[0021] Preferably, the packing assembly comprises: a packing group and a packing gasket;

[0022] The packing gasket is located on the outer wall of the valve stem and is arranged in close contact with the valve stem;

[0023] The filler gasket comprises two upper and lower gaskets, and a filler group is arranged in the hollow part between the two gaskets.

[0024] Preferably, a bottom cover is embedded under the valve body;

[0025] A bottom cover sealing ring is provided at the contact position between the bottom cover and the valve body; the bottom cover sealing ring is used to seal the contact position between the bottom cover and the valve body.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a two-way hard-sealed butterfly valve with an elastic valve seat, in which an elastic valve seat sealing ring is arranged on the valve body, and the contact portion between the valve seat sealing ring and the butterfly plate is an arc flange structure, and the contact side surface between the valve plate and the valve seat sealing ring is also an arc surface structure; no matter whether the direction of the fluid is to impact the butterfly plate or the direction of the fluid is to impact the valve seat sealing ring directly, the valve seat sealing ring will produce sufficient deformation to fit the arc surface of the butterfly plate, fully contact with the butterfly plate, form a seal, and thus achieve two-way sealing.

[0028] The 1 / 2 part of the valve seat sealing ring close to the butterfly plate is set as an "S" bent structure, which is equivalent to having two arc-shaped flange structures. No matter from which direction the fluid impacts, the valve seat sealing ring can have sufficient deformation margin, and after contacting with the butterfly plate, it can have a sufficient deformation range to fit and seal with the butterfly plate, further ensuring the tightness of the seal.

[0029] The valve seat sealing ring is set on the valve body through an insert, and an embedding groove consistent with the curved structure of the valve seat sealing ring is provided on the contact surface between the insert and the valve seat sealing ring; the flange of the valve seat sealing ring is located in the embedding groove, and the embedding groove can ensure that the original arc flange structure of the valve seat sealing ring formed by bending is not forcibly changed by the insert; it does not affect the normal deformation fit between the valve seat sealing ring and the butterfly plate, and the embedding groove can also play an appropriate limiting role on the valve seat sealing ring, thereby avoiding the valve seat sealing ring from possibly running away from the butterfly plate and affecting the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a front structural diagram of the butterfly valve of the utility model;

[0032] Figure 2 It is a side cross-sectional schematic diagram of the butterfly valve of the utility model;

[0033] Figure 3 This is a partial enlarged schematic diagram A of the present invention; specifically, it is a schematic diagram of the structure between the valve seat sealing ring, the insert and the butterfly plate;

[0034] Figure 4 This is a partial enlarged schematic diagram B of the present invention; specifically, it is a structural schematic diagram of the bottom cover and the bottom cover sealing ring below the valve body;

[0035] Figure 5It is a partial enlarged schematic diagram C of the present invention; specifically, it is a structural schematic diagram between the packing group and the packing gasket.

[0036] In the accompanying drawings, the structural names represented by the reference numerals are:

[0037] 1- bracket, 2- valve stem, 3- packing gland, 4- packing group, 5- packing gasket, 6- valve body, 7- shaft sleeve, 8- retaining ring, 9- metal spiral wound gasket, 10- valve seat sealing ring, 11- insert, 12- butterfly plate, 13- bottom cover sealing ring, 14- bottom cover, 15- cylindrical pin. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] A bidirectional hard-sealed butterfly valve with an elastic valve seat, comprising: a bracket 1, a valve body 6, a valve stem 2 and a valve seat sealing ring 10;

[0041] like Figure 1 As shown, the valve body 6 is set below the bracket 1, and the bracket 1 plays the role of fixing and supporting the entire butterfly valve; and the bracket 1 also serves as a rotating structure fixed support for the valve stem 2, as shown in FIG. Figure 2As shown, the lower end of the valve stem 2 passes through the bracket 1 from above the bracket 1, reaches the valve body 6, and is finally inserted into the bottom of the valve body 6; the valve stem 2 is in a rotatable state relative to the bracket 1 and the valve body 6; the butterfly valve bracket is usually provided with a wheel or handle rod for controlling the rotation of the valve stem 2; a butterfly plate 12 is provided on the valve stem 2, and the butterfly plate 12 and the valve stem 2 are fixed by a cylindrical pin 15. There are at least two groups of cylindrical pins 15 for fixing the two, which are respectively located near the top and bottom of the butterfly plate 12. Each group includes at least two cylindrical pins 15. The cylindrical pins 15 are inserted into the butterfly plate 12 horizontally and pass through the valve stem 2; the butterfly plate 12 is located in the valve cavity of the valve body 6 as a whole. The valve cavity here refers to the through channel in the middle of the valve body 6 for the passage of fluid. The butterfly valve is in a completely closed state when the butterfly plate 12 is rotated to be on the same plane as the valve body 6. The butterfly plate 12 cuts off the valve cavity and the butterfly valve is in a completely closed state. As the valve stem 2 rotates, the butterfly plate 12 rotates synchronously, and the plane where the butterfly plate 12 is located gradually forms an angle with the valve body 6. The angle between the two forms an opening in the valve cavity, and the fluid can pass through the opening. At this time, the butterfly valve is open. As the butterfly plate 12 rotates, the angle between the butterfly plate 12 and the valve body 6 gradually increases. When the angle between the plane where the butterfly plate 12 is located and the valve body 6 is 90°, the opening channel of the butterfly valve is the largest and the flow rate of the fluid passing through reaches the maximum.

[0042] The joint between the upper part of the valve body 6 and the bracket 1 is usually connected and fixed by fastening bolts. In order to ensure the sealing of the joint between the bracket 1 and the valve body 6, as shown in FIG. Figure 2 as well as Figure 5 As shown, a packing assembly is provided at the joint position of the valve body 6 and the bracket 1 for sealing and filling the joint between the two; the packing assembly includes: a packing group 4 and a packing gasket 5; the packing gasket 5 is located on the outer wall of the valve stem 2 and is arranged in contact with the valve stem 2; the packing gasket 5 includes two upper and lower gaskets, and the packing group 4 is arranged in the hollow part between the two gaskets.

[0043] like Figure 2 As shown, a shaft sleeve 7 is provided below the packing assembly, the shaft sleeve 7 is provided in the valve body 6, and the valve stem 2 passes through the shaft sleeve 7; and the valve stem 2 is rotatable relative to the shaft sleeve 7; the shaft sleeve 7 reduces the friction resistance between the valve stem 2 and the valve body 6 during rotation, so that the valve stem 2 rotates smoothly.

[0044] A retaining ring 8 is provided at the upper and lower ends of the butterfly plate 12. The retaining ring 8 is provided on the valve body 6. The valve stem 2 passes through the retaining ring 8. There is no connection between the butterfly plate 12 and the valve stem 2 and the retaining ring 8. The retaining ring 8 only limits the position of the butterfly plate 12 in the vertical direction and does not affect the rotation of the valve stem 2 and the butterfly plate 12.

[0045] The lower end of the valve stem 2 is rotatably arranged below the valve body 6, and a bottom cover 14 is provided below the valve body 6 for sealing; in order to ensure the sealing of the joint between the valve body 6 and the bottom cover 14 and avoid fluid leakage, a bottom cover sealing ring 13 is provided at the joint between the bottom of the valve body 6 and the bottom cover 14.

[0046] When the butterfly plate 12 rotates to the sealing state, the fluid will have a certain impact on the butterfly plate 12. If the butterfly plate 12 and the valve body 6 are not sealed, the fluid will leak from the gap between the butterfly plate 12 and the valve body 6. Therefore, under normal circumstances, a valve seat needs to be provided in the valve body 6. The function of the valve seat is to form a seal between the butterfly plate 12 and the valve body 6 to prevent fluid leakage. The valve seat is usually provided on the side wall of the valve cavity of the valve body 6 and is provided in a circle around the side wall of the valve cavity. The valve seat usually adopts an O-ring, and the sealing is achieved by the friction contact between the butterfly plate 12 and the valve seat. However, it can basically only achieve one-way sealing. Therefore, when installing the butterfly valve, it must be installed according to the medium flow direction indicated on the butterfly valve to achieve a sealed installation.

[0047] like Figure 2 and Figure 3 As shown, in this embodiment, a valve seat sealing ring 10 is also provided on the side wall of the valve cavity of the valve body 6. The valve seat sealing ring 10 is made of elastic materials such as rubber. Compared with the valve seat structure with a fixed shape and structure, the valve seat sealing ring 10 in this embodiment is provided with an arc-shaped flange structure at the contact portion with the butterfly plate 12. Specifically, the portion of the valve seat sealing ring 10 away from the butterfly plate 12 can be provided as a straight line, and the portion in contact with the butterfly plate 12 is bent into an arc-shaped flange structure, which is equivalent to a "J"-shaped structure as a whole; in order to make the valve seat sealing ring 10 elastically deform and seal, the contact between the butterfly plate 12 and the valve seat sealing ring 10 can be more closely fitted, and the contact side of the butterfly plate 12 and the valve seat sealing ring 10 is provided as an arc surface.

[0048] like Figure 2As shown, the valve seat sealing ring 10 is arranged on one side of the valve cavity of the valve body 6. In this embodiment, the valve seat sealing ring 10 is arranged on the right side of the valve cavity; correspondingly, the right side of the butterfly plate 12 in contact with the valve seat sealing ring 10 is set as an arc surface. When the butterfly plate 12 is in the closed state, the valve seat sealing ring 10 with an arc-shaped flange structure contacts the butterfly plate 12 and deforms to achieve sealing; when the direction of fluid pressure impacts the butterfly plate 12, the arc surface of the butterfly plate contacts the arc-shaped valve seat sealing ring 10, and the butterfly plate 12 squeezes the valve seat sealing ring 10. The arc-shaped valve seat sealing ring 10 has a sufficiently large deformation and fitting range to make the seal tighter; when the direction of fluid pressure impacts the valve seat sealing ring 10 itself, the valve seat sealing ring 10 itself deforms elastically and fits the arc surface of the butterfly plate 12 to achieve sealing. Since the base parts of the valve seat sealing ring 10 and the butterfly plate 12 are arc flanges and are elastic themselves, sufficient deformation and fit will occur between the valve seat sealing ring 10 and the butterfly plate 12 to achieve sealing of the butterfly plate 12 regardless of whether the fluid direction is left or right.

[0049] like Figure 3 As shown, the valve seat sealing ring 10 is fixed to the valve body 6 by an insert, and a metal wound gasket 9 is wound around the part of the valve seat sealing ring 10 away from the butterfly plate 12, and the part where the metal wound gasket 9 is set is fixed to the valve body 6 by the insert; the metal wound gasket 9 can avoid direct contact between the valve seat sealing ring 10 and the valve body 6 and the insert 11, which causes greater wear on the valve seat sealing ring 10 and may cause the valve seat sealing ring 10 to fall off.

[0050] Example 2

[0051] Based on Example 1, in Example 1, the valve seat sealing ring 10 is set to a "J"-shaped structure, and the contact portion thereof with the butterfly plate 12 is bent into an arc-shaped flange structure, and a bidirectional sealing function is achieved by deformation of the arc-shaped flange structure and contact with the arc side of the butterfly plate 12; the "J"-shaped valve seat sealing ring 10 can actually undergo elastic deformation, and the sealing portion is the arc-shaped flange portion; generally speaking, the greater the impact of the fluid on the butterfly plate 12 or the valve seat sealing ring 10 itself, the greater the deformation of the valve seat sealing ring 10, and the larger the contact range between the valve seat sealing ring 10 and the butterfly plate 12. Therefore, for the valve seat sealing ring 10, the larger the deformable fitting range is, the better the sealing performance after the fluid impact is.

[0052] In order to ensure that the valve seat sealing ring 10 has sufficient deformation fitting margin, a sufficient deformation fitting range can be generated; Figure 3As shown, in this embodiment, the 1 / 2 portion of the valve seat sealing ring 10 away from the butterfly plate 12 is set to a straight structure, and the 1 / 2 portion close to the butterfly plate 12 is set to an "S"-shaped curved structure; this is equivalent to forming two arc-shaped flange structures on the entire valve seat sealing ring 10, which can make the valve seat sealing ring 10 have sufficient deformation margin, so that there can be a sufficient fitting sealing range between it and the butterfly plate 12, thereby improving the sealing between the valve seat sealing ring 10 and the butterfly plate 12.

[0053] Example 3

[0054] Based on Example 1 or Example 2, since the valve seat sealing ring 10 is fixed to the valve body 6 via the insert 11, the valve seat sealing ring 10 is in direct contact with the insert 11; since the valve seat sealing ring 10 itself has an arc-shaped flange structure, the close elastic deformation contact between the arc-shaped flange structure and the butterfly plate 12 realizes bidirectional sealing of the butterfly valve;

[0055] In order to ensure that the arc-shaped flange structure of the valve seat sealing ring 10 itself will not be forcibly changed by the insert 11, Figure 3 As shown, an embedding groove consistent with the curved structure of the valve seat sealing ring 10 is provided on the side where the insert 11 contacts the valve seat sealing ring 10. After the insert 11 contacts the valve seat sealing ring 10, the curved structure of the valve seat sealing ring 10 can also fit into the embedding groove of the same shape as the insert 11; while ensuring that the insert 11 fixes the valve seat sealing ring 10, the arc-shaped curved structure of the valve seat sealing ring 10 itself will not be forcibly changed by the insert 11, thereby not affecting the bidirectional sealing effect of the valve seat sealing ring 10.

[0056] In addition, the embedded groove can also play an appropriate limiting role on the valve seat sealing ring 10, thereby preventing the valve seat sealing ring 10 from significantly deviating relative to the butterfly plate 2 and affecting the sealing effect.

[0057] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0058] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, numerous modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bidirectional hard-sealed butterfly valve with an elastic valve seat, characterized in that: include: Bracket, valve body, valve stem and valve seat seal; A valve body is provided below the bracket; The lower end of the valve stem is vertically inserted into the valve body from the bracket to reach the bottom of the valve body; the valve stem is rotatable relative to the bracket and the valve body; A butterfly plate is provided on the valve stem; the butterfly valve is located in the valve cavity of the valve body; The rotation of the valve stem drives the butterfly plate to rotate synchronously; A valve seat sealing ring is arranged in the valve body; The contact portion between the valve seat sealing ring and the butterfly plate is an arc-shaped flange structure; The contact side surface of the butterfly plate and the valve seat sealing ring is an arc surface.

2. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: The portion of the valve seat sealing ring away from the butterfly plate is in a straight structure, and the portion in contact with the butterfly plate is in an arc flange structure.

3. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: The 1 / 2 portion of the valve seat sealing ring away from the butterfly plate is in a straight structure, and the 1 / 2 portion close to the butterfly plate is in an "S" curved structure.

4. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: The valve seat sealing ring is arranged at a position close to one side in the valve cavity of the valve body; the side surface of the butterfly plate in contact with the valve seat sealing ring is an arc surface.

5. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: A metal wound gasket is wound around one end of the valve seat sealing ring away from the butterfly plate; and then the valve seat sealing ring is fixed on the valve body by an insert.

6. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 5, characterized in that: An embedding groove that is consistent with the curved structure of the valve seat sealing ring is provided on a side of the insert that contacts the valve seat sealing ring.

7. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: A packing assembly is provided at the junction of the valve body and the bracket; The packing assembly is used to seal the connection between the bracket and the valve body.

8. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 7, characterized in that: The packing assembly includes: a packing group and a packing gasket; The packing gasket is located on the outer wall of the valve stem and is arranged in close contact with the valve stem; The filler gasket comprises two upper and lower gaskets, and a filler group is arranged in the hollow part between the two gaskets.

9. A bidirectional hard-sealed butterfly valve with an elastic valve seat according to claim 1, characterized in that: A bottom cover is embedded under the valve body; A bottom cover sealing ring is provided at the contact position between the bottom cover and the valve body; the bottom cover sealing ring is used to seal the contact position between the bottom cover and the valve body.

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