Lining sealing optimized butterfly valve structure

Abstract

The utility model discloses a lining sealing optimized butterfly valve structure, and relates to the technical field of valves. In order to solve the problem that a lining around an existing valve shaft is not tight in sealing or insufficient in deformability, the following technical scheme is provided: the sealing structure comprises a valve body and a valve seat nested in the valve body, an upper shaft hole channel is arranged in the middle of the valve body, and a first mounting groove is arranged on the upper shaft hole channel close to the top of the valve seat; a sealing ring is arranged between the boss structure on the top of the valve seat and the first installation groove, second installation grooves are formed in the end faces of the two sides of the valve body, and the spherical structure on the outer end face of the valve seat is arranged in the second installation grooves. The utility model has the advantages of stable structure, excellent sealing performance, strong corrosion resistance, long service life and the like. The utility model is especially suitable for corrosive media or severe working conditions such as high pressure, high temperature and the like. The structure further has the advantages of being easy to install, disassemble and maintain, and the maintenance cost and the use cost of a user can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a butterfly valve structure with optimized lining seal. Background Art

[0002] Valves can be used to control the flow of various fluids, including air, water, steam, various corrosive media, slurries, oils, liquid metals, and radioactive media. They primarily serve to cut off and throttle flow in pipelines. A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve features a disc-shaped closing element, or disc, that rotates around the valve shaft to open and close.

[0003] Domestic patent number CN202220501134.1 discloses a low-wear fully lined butterfly valve, which includes a valve body and a valve plate installed inside the valve body. The valve plate is driven to rotate by a valve stem installed on the valve body, so that a seal is formed between the valve plate and the lining installed on the inner wall of the valve body; however, the lining around the valve shaft has a loose seal or insufficient yield, and at the same time, the valve port lining cannot prevent the liquid from contacting the metal body of the valve body. Utility Model Content

[0004] The purpose of the utility model is to provide a butterfly valve structure with optimized liner sealing, so as to solve the problems of loose sealing or insufficient concession of the liner around the existing valve shaft.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A liner seal optimized butterfly valve structure includes: a valve body and a valve seat nested inside the valve body, an upper axial hole channel is provided in the middle of the valve body, a first mounting groove is provided in the upper axial hole channel near the top of the valve seat, a sealing ring is provided between the boss structure on the top of the valve seat and the first mounting groove, second mounting grooves are provided on the end faces on both sides of the valve body, and the spherical structure on the outer end face of the valve seat is arranged in the second mounting groove.

[0007] Preferably, the second mounting groove is in the shape of a right-angled trapezoidal structure.

[0008] Preferably, the upper shaft hole channel is located at the upper part of the valve body and is provided with a short shaft sleeve, and the upper shaft hole channel is located at the lower part of the valve body and is provided with a long shaft sleeve.

[0009] Preferably, a lower rotating shaft is provided in the middle of the upper shaft hole channel, and an O-ring is provided on the top of the short shaft sleeve.

[0010] Preferably, an open positioning plate is provided on the top of the O-ring.

[0011] Preferably, an elastic retaining ring is provided on the top of the opening positioning plate.

[0012] The utility model has the following beneficial effects:

[0013] Adding a copper gasket to the first mounting slot adjusts the switch load torque and improves sealing performance. The copper gasket's elasticity and plasticity allow it to fill tiny gaps during assembly, ensuring a tight fit between the valve seat and the valve body. Furthermore, the copper gasket's corrosion and wear resistance ensures a stable seal over long-term use.

[0014] The valve seat (liner) is made of NBR or EPDM, perfectly conforming to the valve body's interior and end faces, shielding the valve from corrosive media. This material selection not only ensures the seat's corrosion and wear resistance, but also, through the lining, further enhances the valve's sealing performance and stability. Furthermore, the lining's elasticity reduces friction and wear between the seat and body during valve opening and closing, extending the valve's service life.

[0015] The second mounting groove on the valve body end face is a right-angled trapezoidal structure, which facilitates the insertion of the spherical structure on the valve seat end face. During assembly, the spherical structure is squeezed by the valve body end face and elastically deforms, thus filling the small gap between the valve seat and the valve body. This design not only improves the valve's sealing performance but also facilitates the installation and removal of the valve seat. Furthermore, the right-angled trapezoidal second mounting groove also limits and secures the spherical structure, preventing it from moving or falling off during valve opening and closing.

[0016] A boss structure is provided on the central exterior of the valve body, and a first mounting groove is located in the center of the valve body's interior. During assembly, the boss structure and the first mounting groove cooperate to strengthen the positioning of the valve seat within the valve body. This design not only ensures the stability and reliability of the valve seat within the valve body, but also further enhances the valve's sealing performance through the interaction between the boss structure and the first mounting groove. Furthermore, the boss structure facilitates positioning and securing the valve seat during assembly, improving assembly efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the liner seal optimized butterfly valve structure of the utility model;

[0018] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0019] Figure 3 This is a cross-sectional view of the liner seal optimized butterfly valve structure of the utility model;

[0020] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0021] Figure 5A schematic diagram of the valve body structure of the utility model showing an optimized liner seal butterfly valve structure;

[0022] Figure 6 A schematic diagram of the valve seat structure of the butterfly valve structure with optimized liner seal according to the present invention;

[0023] Figures 1 to 6 The reference numerals shown in the figure respectively represent: valve body 1, first mounting groove 101, second mounting groove 102, long shaft sleeve 2, lower rotating shaft 3, valve plate 4, nameplate rivet 5, nameplate 6, short shaft sleeve 7, O-ring 8, opening positioning plate 9, elastic retaining ring 10, upper rotating shaft 11, valve seat 12, boss structure 121, spherical structure 122, sealing ring 13. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] Please refer to Figure 1-4 This embodiment relates to a butterfly valve structure with optimized liner seal. This structure aims to provide a butterfly valve that is not only structurally stable but also has excellent sealing performance. It is particularly suitable for processing corrosive media or operating under harsh working conditions such as high pressure and high temperature. The following is a detailed description of the butterfly valve structure of this embodiment:

[0026] Please refer to Figure 5-6 The core components of this butterfly valve structure include the valve body 1 and the valve seat 12 nested within it. The valve body 1, serving as the main support structure of the entire butterfly valve, is designed to incorporate specific structures and channels from top to bottom to meet the various functional requirements of the butterfly valve. Specifically, the upper shaft hole channel is cleverly designed in the middle of the valve body 1. This design not only ensures the flexible rotation of the valve shaft but also significantly improves the valve's sealing performance by introducing a specific sealing structure.

[0027] A first mounting groove 101 is meticulously designed in a key location near the top of the valve seat 12, located in the upper axial bore of the valve body 1. The shape and size of the first mounting groove 101 perfectly match the boss structure 121 atop the valve seat 12, ensuring that the valve seat 12 can be accurately and securely mounted on the valve body 1. To further enhance the sealing effect between the valve seat 12 and the valve body 1, a sealing ring 13 is cleverly positioned between the first mounting groove 101 and the boss structure 121. In this embodiment, the sealing ring 13 is preferably made of a copper gasket. This material, with its excellent elasticity and corrosion resistance, not only effectively adjusts the switching load torque but also fills small gaps during assembly, thereby ensuring a tight fit between the valve seat 12 and the valve body 1.

[0028] The valve seat 12, a key component of a butterfly valve, is crucial to its overall performance. In this embodiment, the valve seat 12 is made of high-performance materials such as NBR (nitrile butadiene rubber) or EPDM (ethylene propylene diene monomer). These materials not only offer excellent corrosion and wear resistance, enabling them to maintain stable operation in corrosive media over extended periods of time, but also exhibit excellent elasticity and wear resistance, significantly reducing friction and wear between the valve seat and the valve body, thereby extending the valve's service life.

[0029] The boss structure 121 of the valve seat 12 fits tightly with the first mounting groove 101 of the valve body 1, not only enhancing the positioning stability of the valve seat within the valve body but also achieving a highly effective seal between the valve seat and the valve body through the compression deformation of the sealing ring 13. Furthermore, the outer end surface of the valve seat 12 is cleverly designed with a spherical structure 122, which precisely matches the second mounting grooves 102 defined on both side surfaces of the valve body 1. The second mounting grooves 102 are designed as right-angled trapezoids, which not only facilitate the smooth insertion of the spherical structure 122 of the valve seat 12 during installation but also further enhance the sealing performance between the valve seat and the valve body through the compression of the spherical structure 122 during assembly.

[0030] To further enhance the valve's sealing performance and stability, this embodiment meticulously incorporates short sleeves 7 and long sleeves 2 at various locations within the upper axial bore of the valve body 1. The short sleeve 7, located above the upper axial bore, primarily supports and secures the rotating portion of the valve shaft, preventing unnecessary friction and wear between the valve shaft and the valve body during rotation. The long sleeve 2, located below the upper axial bore, works in conjunction with the short sleeve 7 to ensure flexible rotation and stable operation of the valve shaft.

[0031] An O-ring 8 is added to the top of the short sleeve 7, further enhancing the seal between the valve shaft and the short sleeve 7. The short sleeve 7 and O-ring 8 can be provided as one or more sets. With its excellent elasticity and sealing properties, the O-ring 8 effectively prevents leakage of media from the shaft hole during valve shaft rotation. Furthermore, the O-ring 8 is also wear-resistant, ensuring stable sealing performance over long-term use.

[0032] To secure the O-ring 8, this embodiment cleverly incorporates an open positioning plate 9 on top of the O-ring 8. This plate 9 is tightly connected to the valve body 1 via bolts or other fasteners, firmly securing the O-ring 8 to the top of the stub sleeve 7. This design not only ensures the stability and reliability of the O-ring 8 but also facilitates replacement or repair when necessary.

[0033] A circlip 10 is added to the top of the opening positioning plate 9 to further secure the valve shaft and prevent axial movement. Due to its excellent elasticity and wear resistance, the circlip 10 maintains a stable fixation during valve shaft rotation, preventing damage to the valve shaft due to axial movement or affecting the normal operation of the valve.

[0034] The valve body 1 is precision-machined from a casting, resulting in a compact and high-strength structure, fully capable of meeting the demands of operating under harsh operating conditions such as high pressure and high temperature. From top to bottom, the valve body 1 is designed as follows: an upper axial bore channel, within which are located a sealing surface for contact with the sealing ring and a countersunk hole for positioning and adjustment of the liner; a central portion containing the valve cavity; and a lower axial bore channel, also within which are located a sealing surface for contact with the sealing ring, a countersunk hole for positioning and adjustment of the liner, and a sealing screw hole. This design not only ensures the valve's sealing performance but also facilitates maintenance and adjustment of the valve when necessary.

[0035] Valve seats 12 (EPDM or NBR lined) are installed on the inner wall and end faces of the valve cavity. These lining materials, with their excellent corrosion and wear resistance, effectively protect the valve body from corrosive media. Furthermore, the lining's elasticity reduces friction and wear between the seat and body during valve opening and closing, further extending the valve's service life. The control medium only comes into contact with the lining, ensuring the long-term stability and reliability of the valve body.

[0036] The valve body 1 adopts a monolithic design, constructed from a cast blank that undergoes precision machining. This monolithic design not only significantly improves the valve's strength and stability but also facilitates precision and quality control during the manufacturing process. Furthermore, the monolithic structure reduces the complexity and workload of valve assembly, thereby improving production efficiency.

[0037] Carefully designed grooves are located at the intersection of the valve body's end face and the inner liner. These grooves interact with each other through a concave-convex structure, leaving a compression gap for the liner's circular protrusion. This design not only ensures the liner's secure attachment to the valve body's end face but also, through the provision of a compression gap, further enhances the valve's sealing performance. During valve opening and closing, the liner's circular protrusion compresses and deforms, filling the tiny gap between the valve body's end face and the inner liner, effectively preventing leakage of media through this area.

[0038] Furthermore, the targeted design element, sealing ring 13, employed in this embodiment, offers superior process performance compared to its operational performance. This design primarily adjusts the thickness of the valve seat at the valve plate's shaft end, thereby altering the elastic modulus at that location (the mold and valve plate dimensions define deformation; the fundamental purpose of adjusting the elastic modulus is to adjust the preload). By adjusting the thickness of sealing ring 13, the sealing performance of valve seat 12 at the shaft end can be quickly adjusted. This design significantly improves production flexibility and stability, reducing the time and material costs associated with process commissioning and factory replacement.

[0039] Specifically, the main materials of the valve seat 12 are EPDM and NBR, and the sealing performance of the butterfly valve is achieved through elastic extrusion between the valve plate sealing surface and the valve seat. The pressure change, elongation and other properties of the valve seat are greatly affected by the factory formula and curing process. Therefore, even if the same mold is used, the sealing performance of products produced by different factories may be different. In the absence of a sealing ring 13, the required sealing effect can usually only be achieved by fine-tuning the valve seat mold size or fine-tuning the valve plate size. However, such repeated adjustments will not only result in huge material and time costs, but also pose the risk of over-mold repair. Once the mold is over-repaired, it will lead to excessive elastic extrusion, resulting in quality problems such as unqualified switching torque.

[0040] With the seal ring 13, frequent mold adjustments to adjust product assembly performance are no longer necessary. Simply adjusting the thickness of the seal ring 13 quickly achieves the desired sealing effect. This design not only significantly improves production efficiency but also reduces production costs and quality risks.

[0041] In summary, the liner-seal optimized butterfly valve structure of this embodiment, with its advantages of structural stability, excellent sealing performance, strong corrosion resistance, long service life, and easy installation, disassembly, and maintenance, performs exceptionally well in harsh operating conditions such as corrosive media or high pressure and high temperature. Furthermore, this butterfly valve structure has broad market application prospects and significant economic benefits, providing a more reliable and efficient valve solution for related industries.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liner seal optimized butterfly valve structure, characterized in that: include: A valve body (1) and a valve seat (12) nested inside the valve body (1), wherein an upper axial hole channel is provided in the middle of the valve body (1), and a first mounting groove (101) is provided on the upper axial hole channel near the top of the valve seat (12), and a sealing ring (13) is provided between the boss structure (121) on the top of the valve seat (12) and the first mounting groove (101), and the sealing ring (13) is used to adjust the sealing performance of the valve seat (12), and second mounting grooves (102) are provided on the end faces on both sides of the valve body (1), and the spherical structure (122) on the outer end face of the valve seat (12) is arranged in the second mounting groove (102).

2. The liner seal optimized butterfly valve structure according to claim 1 is characterized in that: The second mounting groove (102) is in the shape of a right-angled trapezoidal structure.

3. The liner seal optimized butterfly valve structure according to claim 1 is characterized in that: The upper shaft hole channel is located at the upper part of the valve body (1) and is provided with a short shaft sleeve (7), and the upper shaft hole channel is located at the lower part of the valve body (1) and is provided with a long shaft sleeve (2).

4. The liner seal optimized butterfly valve structure according to claim 1 is characterized in that: A lower rotating shaft (3) is provided in the middle of the upper shaft hole channel, and a valve plate (4) is provided on the lower rotating shaft (3).

5. The liner seal optimized butterfly valve structure according to claim 3 is characterized in that: An O-ring (8) is provided on the top of the short shaft sleeve (7).

6. The liner seal optimized butterfly valve structure according to claim 5 is characterized in that: An opening positioning plate (9) is provided on the top of the O-ring (8).

7. The liner seal optimized butterfly valve structure according to claim 6 is characterized in that: An elastic retaining ring (10) is provided on the top of the opening positioning plate (9).

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