Double eccentric rubber lined butterfly valve

Abstract

The utility model belongs to butterfly valve technical field discloses double eccentricity rubber -lined butterfly valve, the utility model discloses a valve body, the valve body includes valve rod, and the valve rod rotation is connected in the inside of valve body, and the outer surface of valve rod installs butterfly plate, and the outer surface of butterfly plate is in abutment in the inner wall of valve body, and the inner wall of valve body is installed with sealing assembly no.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a double eccentric rubber-lined butterfly valve. Background Technology

[0002] In the field of valve technology, double-eccentric rubber-lined butterfly valves, with their advantages of low friction and ease of operation brought about by their double-eccentric structure, have been widely used in industries such as water supply and drainage, sewage treatment, and chemical processing. The rubber lining of the valve seat, its core sealing component, is crucial to ensuring the valve's sealing performance.

[0003] Traditional double-eccentric rubber-lined butterfly valve seats often employ a single-material rubber lining structure, such as using only EPDM rubber or PTFE. While EPDM rubber, as a single lining layer, offers good elasticity and aging resistance, and can generally meet sealing requirements, its corrosion resistance is insufficient when exposed to fluids containing corrosive media. Prolonged contact can lead to swelling or cracking, resulting in seal failure and affecting the valve's service life.

[0004] Therefore, a double eccentric rubber-lined butterfly valve is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a double eccentric rubber-lined butterfly valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A double eccentric rubber-lined butterfly valve includes a valve body, the valve body including a valve stem rotatably connected inside the valve body, a butterfly plate installed on the outer surface of the valve stem, the outer surface of the butterfly plate abutting against the inner wall of the valve body, a sealing component one installed on the inner wall of the valve body, and a sealing component two provided on the outer surface of the valve body.

[0008] Furthermore, the sealing assembly includes an EPDM rubber layer and a PTFE layer. The EPDM rubber layer is installed on the inner wall of the valve body, and the PTFE layer is installed on the inner wall of the EPDM rubber layer by adhesive. The inner wall of the PTFE layer is attached to the outer surface of the butterfly plate.

[0009] Furthermore, the second sealing assembly includes a protective cover, a through hole is provided at the top of the valve body, the valve stem is rotatably connected inside the through hole of the valve body, a driving part is installed at the top of the valve stem, flexible graphite is filled between the valve stem and the inner wall of the through hole, the protective cover is sleeved on the outer end of the valve stem, the lower surface of the protective cover abuts against the upper surface of the flexible graphite, threaded holes are provided on the upper surfaces of both the protective cover and the valve body, and bolts are threadedly connected inside the threaded holes of the protective cover and the valve body.

[0010] Furthermore, the central axis of the butterfly plate is offset from the axis of the valve stem, and the axis of the valve stem is offset from the centerline of the valve body.

[0011] Furthermore, a groove is formed on the bottom inner wall of the valve body, a bearing is installed inside the groove, a rotating block is installed on the inner wall of the bearing, the top of the rotating block is installed on the lower surface of the valve stem, and the bearing is located at the lower end of the valve stem.

[0012] Furthermore, the surface of the butterfly plate is provided with a wear-resistant coating, which is a ceramic coating.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model utilizes the excellent elasticity and aging resistance of the EPDM rubber layer and the superior corrosion resistance and wear resistance of the PTFE layer. The PTFE layer is then bonded to the inner wall of the EPDM rubber layer with adhesive, forming a composite layer structure. This allows the sealing component to combine the advantages of both, making it less prone to aging and detachment during use, thus improving the service life and sealing performance of the valve body.

[0015] 2. This utility model installs a protective cover on the upper surface of the valve body, which restricts the movement of flexible graphite inside the valve body through hole. This allows the flexible graphite to seal the connection gap between the inner wall of the valve body through hole and the outer wall of the valve stem. Furthermore, the flexible graphite has good sealing performance and high temperature resistance, thus preventing leakage of the internal flow medium along the connection between the valve stem and the inner wall of the valve body through hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0018] Figure 3 This is a side view of the structure of this utility model;

[0019] Figure 4 This is a cross-sectional view of the valve body of this utility model.

[0020] Reference numerals: 1. Valve body; 2. Drive unit; 3. Sealing assembly one; 301. EPDM rubber layer; 302. PTFE layer; 4. Valve stem; 5. Butterfly plate; 6. Sealing assembly two; 601. Protective cover; 602. Flexible graphite; 603. Bolt; 7. Bearing; 8. Rotating block. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1 to 4 As shown, the double eccentric rubber-lined butterfly valve includes a valve body 1, which includes a valve stem 4 rotatably connected inside the valve body 1. A butterfly plate 5 is installed on the outer surface of the valve stem 4, and the outer surface of the butterfly plate 5 abuts against the inner wall of the valve body 1. A sealing component 1 3 is installed on the inner wall of the valve body 1, and a sealing component 2 6 is provided on the outer surface of the valve body 1. Specifically, the sealing component 1 3 has good elasticity, aging resistance, and excellent corrosion resistance and wear resistance, making it less prone to aging and detachment during use, thus improving the service life and sealing performance of the valve body 1. By installing the sealing component 2 6, the connection gap between the inner wall of the through hole of the valve body 1 and the outer wall of the valve stem 4 is sealed, preventing leakage of the internal flowing medium of the valve body 1 along the connection between the valve stem 4 and the inner wall of the through hole of the valve body 1, thus improving the stability of the device during use.

[0026] The sealing assembly 3 includes an EPDM rubber layer 301 and a PTFE layer 302. The EPDM rubber layer 301 is installed on the inner wall of the valve body 1, and the PTFE layer 302 is installed on the inner wall of the EPDM rubber layer 301 by adhesive. The inner wall of the PTFE layer 302 is attached to the outer surface of the butterfly plate 5. Specifically, the EPDM rubber layer 301 has good elasticity and aging resistance, while the PTFE layer 302 has excellent corrosion resistance and wear resistance. The PTFE layer 302 is then bonded to the inner wall of the EPDM rubber layer 301 by adhesive, forming a composite layer structure. This allows the sealing assembly 3 to combine the advantages of both, making it less prone to aging and detachment during use, thus improving the service life and sealing performance of the valve body 1.

[0027] Sealing assembly 2 6 includes a protective cover 601, a through hole at the top of the valve body 1, a valve stem 4 rotatably connected inside the through hole of the valve body 1, a drive unit 2 installed at the top of the valve stem 4, flexible graphite 602 filling the space between the valve stem 4 and the inner wall of the through hole, the protective cover 601 being sleeved on the outer end of the valve stem 4, the lower surface of the protective cover 601 abutting against the upper surface of the flexible graphite 602, threaded holes being provided on the upper surfaces of both the protective cover 601 and the valve body 1, and the threaded holes of the protective cover 601 and the valve body 1 being internally threaded. There is a bolt 603; specifically, by installing the protective cover 601 onto the upper surface of the valve body 1, the protective cover 601 restricts the movement of the flexible graphite 602 inside the through hole of the valve body 1, thereby sealing the connection gap between the inner wall of the through hole of the valve body 1 and the outer wall of the valve stem 4. Furthermore, the flexible graphite 602 has good sealing performance and high temperature resistance, preventing leakage of the internal flowing medium of the valve body 1 along the connection between the valve stem 4 and the inner wall of the through hole of the valve body 1.

[0028] The central axis of the butterfly plate 5 is offset from the axis of the valve stem 4, and the axis of the valve stem 4 is also offset from the center line of the valve body 1. Specifically, by offsetting the axis of the valve stem 4 from both the center line of the sealing surface of the butterfly plate 5 and the center line of the valve body 1, the butterfly plate 5 can quickly detach from the sealing surface of the valve body 1 in the initial opening and closing phase. Compared with the central seal or single eccentric structure, this fundamentally changes the contact mode between the butterfly plate 5 and the valve body 1. That is, in the opening phase of the device, the butterfly plate 5 mainly uses non-contact rotational motion, with only brief local contact when approaching the fully open or fully closed position. When the butterfly plate 5 is closed, it forms a seal with the valve body 1 in a progressive fitting manner, avoiding the continuous friction caused by the full-process scraping in the traditional structure. This can effectively reduce the risk of aging and peeling of the sealing component 3 due to friction, thus improving the replacement cycle of the sealing component 3.

[0029] The bottom inner wall of the valve body 1 has a groove, and a bearing 7 is installed inside the groove. A rotating block 8 is installed on the inner wall of the bearing 7. The top of the rotating block 8 is installed on the lower surface of the valve stem 4, and the bearing 7 is located at the lower end of the valve stem 4. Specifically, by installing the bottom of the valve stem 4 onto the upper surface of the rotating block 8, the rotating block 8 and the bearing 7 restrict the position of the valve stem 4 at the bottom inside the valve body 1, preventing the valve stem 4 from bending when subjected to impact, thus improving the service life of the valve stem 4. By positioning the bearing 7 at the lower end of the valve stem 4, the bottom of the valve stem 4 blocks the bearing 7, preventing the flowing medium inside the valve body 1 from entering the bearing 7 and causing blockage inside the bearing 7.

[0030] The surface of the butterfly plate 5 is provided with a wear-resistant coating, which is a ceramic coating. Specifically, by providing a ceramic wear-resistant coating on the surface of the butterfly plate 5, the wear resistance of the outer surface of the butterfly plate 5 is enhanced, so that it can work stably for a long time in fluids containing particulate impurities, avoiding friction damage to the butterfly plate 5 after long-term use, thus improving the service life of the butterfly plate 5.

[0031] In summary: The EPDM rubber layer 301 possesses excellent elasticity and aging resistance, while the PTFE layer 302 exhibits superior corrosion resistance and wear resistance. By bonding the PTFE layer 302 to the inner wall of the EPDM rubber layer 301 with adhesive, a composite layer structure is formed. This allows the sealing component 3 to combine the advantages of both, making it less prone to aging and detachment during use. Furthermore, by installing the protective cover 601 onto the upper surface of the valve body 1, the cover restricts the movement of the flexible graphite 602 within the through-hole of the valve body 1. This allows the flexible graphite 602 to seal the connection gap between the inner wall of the through-hole of the valve body 1 and the outer wall of the valve stem 4. The flexible graphite 602 also possesses good sealing performance and high-temperature resistance, preventing leakage of the internal flowing medium along the connection between the valve stem 4 and the inner wall of the through-hole of the valve body 1.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A double eccentric rubber-lined butterfly valve, comprising a valve body (1), characterized in that: The valve body (1) includes a valve stem (4), which is rotatably connected inside the valve body (1). A butterfly plate (5) is installed on the outer surface of the valve stem (4), and the outer surface of the butterfly plate (5) abuts against the inner wall of the valve body (1). A sealing component one (3) is installed on the inner wall of the valve body (1), and a sealing component two (6) is provided on the outer surface of the valve body (1).

2. The double eccentric rubber-lined butterfly valve according to claim 1, characterized in that: The sealing assembly (3) includes an EPDM rubber layer (301) and a PTFE layer (302). The EPDM rubber layer (301) is installed on the inner wall of the valve body (1), and the PTFE layer (302) is installed on the inner wall of the EPDM rubber layer (301) by adhesive. The inner wall of the PTFE layer (302) is attached to the outer surface of the butterfly plate (5).

3. The double eccentric rubber-lined butterfly valve according to claim 1, characterized in that: The sealing assembly 2 (6) includes a protective cover (601), a through hole is provided at the top of the valve body (1), the valve stem (4) is rotatably connected inside the through hole of the valve body (1), a drive part (2) is installed at the top of the valve stem (4), flexible graphite (602) is filled between the valve stem (4) and the inner wall of the through hole, the protective cover (601) is sleeved on the outer end of the valve stem (4), the lower surface of the protective cover (601) abuts against the upper surface of the flexible graphite (602), threaded holes are provided on the upper surfaces of the protective cover (601) and the valve body (1), and bolts (603) are threadedly connected inside the threaded holes of the protective cover (601) and the valve body (1).

4. The double eccentric rubber-lined butterfly valve according to claim 1, characterized in that: The central axis of the butterfly plate (5) is deviated from the axis of the valve stem (4), and the axis of the valve stem (4) is deviated from the center line of the valve body (1).

5. The double eccentric rubber-lined butterfly valve according to claim 1, characterized in that: The valve body (1) has a groove on its inner bottom wall. A bearing (7) is installed inside the groove of the valve body (1). A rotating block (8) is installed on the inner wall of the bearing (7). The top of the rotating block (8) is installed on the lower surface of the valve stem (4). The bearing (7) is located at the lower end of the valve stem (4).

6. The double eccentric rubber-lined butterfly valve according to claim 2, characterized in that: The surface of the butterfly plate (5) is provided with a wear-resistant coating, which is a ceramic coating.

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