Double-clip type three-eccentric hard sealing butterfly valve

Abstract

The utility model discloses a wafer type three-eccentric hard sealing butterfly valve, which relates to the technical field of butterfly valves, and comprises a main valve body, and the inner wall of the main valve body is rotatably connected with a butterfly plate; the butterfly plate comprises a rotating shaft, the rotating shaft is rotationally connected to the inner wall of the main valve body, the outer wall of the rotating shaft is fixedly connected with a rear plate, the side wall of the rear plate is fixedly connected with a center fixing column, the tail end of the center fixing column is fixedly connected with a front plate, and two first sliding pieces are arranged between the front plate and the rear plate. The two sets of first sliding sheets are attached to the side wall of the rear plate in a sliding mode, and the side wall of each set of first sliding sheets is fixedly connected with a set of sealing strips. After the two groups of sealing strips are abraded, the elastic force of the first spring piece pushes the two groups of sealing strips to be attached to the inner wall of the valve body all the time, so that the sealing performance of the valve in the subsequent use process is guaranteed, the service life of the valve is prolonged, the maintenance frequency of the valve is reduced, and the service life of the valve is prolonged. And therefore, the use cost of the valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a clamp-type three-eccentric hard-sealed butterfly valve. Background Art

[0002] The three-eccentric hard-sealed butterfly valve has an eccentric metal sealing structure. The sealing form is metal-to-metal sealing, which can be replaced by metal sealing ring to metal sealing, stainless steel plate and graphite composite plate sealing ring to metal sealing. In addition to electric driving, the hard-sealed butterfly valve also has manual, worm gear drive, pneumatic, etc.

[0003] The currently used low-temperature three-eccentric butterfly valve may experience valve stem locking, torque increase, and valve stem scratches under low temperature conditions, and it is difficult to replace the sealing pair at low temperatures.

[0004] The existing patent (Announcement No.: CN220816574U) discloses a low-temperature three-eccentric butterfly valve, which includes a valve body, a valve stem is arranged in the valve body, a butterfly plate is connected to the valve stem, a valve cover is connected to the top of the valve body through an extension tube, the valve cover includes a packing layer, the extension tube is sleeved on the valve stem, the packing layer is laminated between the inner wall surface of the top of the valve cover and the outer surface of the upper valve stem, a valve seat is arranged in the inner hole of the valve body, wherein the butterfly plate and the valve stem are connected through a flat key, a boss ring and a groove ring are provided on the inner hole of the valve body, the valve seat has a step ring, the step ring is plugged with the boss ring, the groove ring is provided with a valve seat pressure plate, the step ring is located between the boss ring and the valve seat pressure plate, and the step ring is connected to the valve stem through a flat key to avoid the valve stem locking and torque increase caused by the connection between the butterfly plate and the valve stem at low temperature; the integrated structure of the valve body and the valve seat is changed to a parts structure designed separately for the valve seat, so as to improve the surfacing and processing quality of the valve seat and the low temperature adaptability, and also make the maintenance and disassembly of the valve seat more convenient.

[0005] However, the above technical solution still has certain defects. During use, the edge seal of the butterfly plate and the valve body causes a certain degree of wear due to friction. At this time, sufficient sealing cannot be guaranteed between the butterfly plate and the valve body, which leads to the need for valve maintenance. The service life of the valve is short and the subsequent maintenance and use costs are high. For this reason, a clamp-type three-eccentric hard-sealed butterfly valve is proposed. Utility Model Content

[0006] Based on this, the purpose of the utility model is to provide a wafer-type three-eccentric hard-sealed butterfly valve to solve the technical problems raised in the above background.

[0007] To achieve the above object, the utility model provides the following technical solution: a wafer-type three-eccentric hard-sealed butterfly valve, comprising a main valve body, the inner wall of which is rotatably connected to a butterfly plate;

[0008] The butterfly plate includes a rotating shaft, which is rotatably connected to the inner wall of the main valve body, the outer wall of the rotating shaft is fixedly connected to a rear plate, the side wall of the rear plate is fixedly connected to a central fixing column, the end of the central fixing column is fixedly connected to a front plate, two groups of first sliding plates are arranged between the front plate and the rear plate, the two groups of first sliding plates are slidably fitted on the side wall of the rear plate, the side walls of each group of the first sliding plates are respectively fixedly connected to a group of sealing strips, and two groups of first spring plates are fixedly connected between the two groups of the first sliding plates.

[0009] As the preferred technical solution of the clamped three-eccentric hard-sealed butterfly valve of the utility model, a second sliding plate is arranged between the front plate and the rear plate, two groups of the second sliding plates are slidably fitted between the first sliding plate and the front plate, and two groups of second spring plates are fixedly connected between the two groups of the second sliding plates.

[0010] As the preferred technical solution of the clamped three-eccentric hard-sealed butterfly valve of the utility model, a group of sealing blocks are fixedly connected to the side walls of each group of the second sliding vanes, and the sealing blocks are tightly fitted to the ends of the two groups of sealing strips. The end of the sealing block close to the center fixed column is wider, and the end away from the center fixed column is narrower.

[0011] As a preferred technical solution of the clamped three-eccentric hard-sealed butterfly valve of the utility model, the bottom end of the valve body is connected with a buffer mechanism, and the buffer mechanism includes a buffer bin, and the buffer bin is connected to the bottom end of the main valve body.

[0012] As the preferred technical solution of the clamp-type three-eccentric hard-sealed butterfly valve of the utility model, the inner wall of the buffer bin is slidably connected with a piston, the bottom end of the piston is fixedly connected with a fixing bar, the inner wall of the fixing bar is slidably connected with two groups of friction blocks extending to the outside of the fixing bar, the two groups of friction blocks are located at one end outside the fixing bar and are attached to the inner wall of the buffer bin, and the friction blocks are provided with grooves at the contact positions with the buffer bin.

[0013] As a preferred technical solution of the clamped three-eccentric hard-sealed butterfly valve of the utility model, an extrusion spring located inside the fixing strip is fixedly connected between the two groups of friction blocks.

[0014] As a preferred technical solution for the clamped three-eccentric hard-sealed butterfly valve of the utility model, the bottom end of the fixing strip is fixedly connected to one end of a reset spring, and the other end of the reset spring is fixedly connected to the bottom end of the inner wall of the buffer bin.

[0015] In summary, the utility model mainly has the following beneficial effects:

[0016] 1. After the two sets of sealing strips are worn, the elastic force of the first spring sheet pushes the two sets of sealing strips to always fit the inner wall of the valve body, so that the sealing of the valve is guaranteed in the subsequent use process, the service life of the valve is extended, the maintenance frequency of the valve is reduced, and the use cost of the valve is reduced;

[0017] 2. After the butterfly plate is closed, the utility model generates an impact force due to inertia of the water flow. At this time, the water near the butterfly plate flows into the buffer bin. The elastic deformation of the return spring and the friction between the friction block and the buffer bin are used to buffer and consume the impact force of the water flow, thereby reducing the influence of the water hammer effect on the butterfly plate and improving the pressure resistance of the entire valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main structure of the butterfly plate of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the first sliding plate and the second sliding plate of the utility model;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the bottom end portion of the valve body of the utility model;

[0022] Figure 5 For the utility model Figure 4 Enlarged structural diagram at A in the middle.

[0023] In the figure: 1. Main valve body; 2. Butterfly plate; 3. Buffer mechanism;

[0024] 201, rotating shaft; 202, rear plate; 203, central fixing column; 204, front plate; 205, first sliding plate; 206, sealing strip; 207, first spring sheet; 208, second sliding plate; 209, sealing rubber block; 210, second spring sheet;

[0025] 301, buffer chamber; 302, piston; 303, fixing bar; 304, friction block; 305, extrusion spring; 306, return spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0027] The following describes an embodiment of the utility model based on its overall structure.

[0028] Wafer type three eccentric hard seal butterfly valve, such as Figures 1 to 5 As shown, it comprises a main valve body 1, the inner wall of which is rotatably connected with a butterfly plate 2;

[0029] The butterfly plate 2 includes a rotating shaft 201, which is rotatably connected to the inner wall of the main valve body 1, and the outer wall of the rotating shaft 201 is fixedly connected to a rear plate 202, and the side wall of the rear plate 202 is fixedly connected to a central fixed column 203, and the end of the central fixed column 203 is fixedly connected to a front plate 204, and two groups of first slides 205 are arranged between the front plate 204 and the rear plate 202, and the two groups of first slides 205 are slidably attached to the side wall of the rear plate 202, and the side wall of each group of first slides 205 is respectively fixedly connected to a group of sealing strips 206, and the two groups of first slides 205 are fixedly connected to each other. Two groups of first spring sheets 207, a second slide sheet 208 is arranged between the front plate 204 and the rear plate 202, the two groups of second slide sheets 208 are slidably fitted between the first slide sheet 205 and the front plate 204, two groups of second spring sheets 210 are fixedly connected between the two groups of second slide sheets 208, and a group of sealing rubber blocks 209 are fixedly connected to the side walls of each group of second slide sheets 208, and the sealing rubber blocks 209 are tightly fitted to the ends of the two groups of sealing strips 206, and the end of the sealing rubber block 209 close to the central fixed column 203 is wider, and the end away from the central fixed column 203 is narrower.

[0030] When the butterfly plate 2 rotates and closes, the butterfly plate 2 drives the sealing ring to rotate, so that the sealing ring fits against the inside of the valve body. After a period of use, the sealing ring is gradually worn each time the butterfly plate 2 is opened and closed, and the resilience of the first return spring 306 pushes the two groups of first slides 205 away from each other, so that the two groups of first slides 205 respectively push one group of sealing rings to fit against the inner wall of the valve body, so that the two groups of sealing rings can still fit tightly against the inner wall of the valve body after being worn, and after the gap between the two groups of sealing rings becomes larger, the resilience of the second spring sheet 210 pushes the two groups of second slides 208 away from each other, so that the two groups of sealing rubber blocks 209 move in the upward and downward directions respectively. Since the end of the sealing rubber block 209 close to the central fixing column 203 is wider, the sealing rubber block 209 can still fit tightly against the ends of the two groups of sealing rings after the gap between the two groups of sealing rings increases, so that the sealing performance at the gap between the two groups of sealing rings is guaranteed.

[0031] Please refer to Figure 4 and Figure 5The bottom end of the valve body is connected to a buffer mechanism 3, and the buffer mechanism 3 includes a buffer bin 301, which is connected to the bottom end of the main valve body 1. The inner wall of the buffer bin 301 is slidably connected to a piston 302, and the bottom end of the piston 302 is fixedly connected to a fixing bar 303. The inner wall of the fixing bar 303 is slidably connected to two groups of friction blocks 304 extending to the outside of the fixing bar 303. One end of the two groups of friction blocks 304 located outside the fixing bar 303 is attached to the inner wall of the buffer bin 301, and the friction blocks 304 are provided with grooves at the contact position with the buffer bin 301. An extrusion spring 305 located inside the fixing bar 303 is fixedly connected between the two groups of friction blocks 304. The bottom end of the fixing bar 303 is fixedly connected to one end of a reset spring 306, and the other end of the reset spring 306 is fixedly connected to the bottom end of the inner wall of the buffer bin 301.

[0032] After the butterfly plate 2 is closed, the water flow inside the pipeline will continue to move forward and be installed on the butterfly plate 2 due to inertia, so that the butterfly plate 2 will be subjected to greater pressure. At this time, the water flows into the buffer chamber 301 and pushes the piston 302 to slide downward. During the downward sliding process of the piston 302, the piston 302 pushes the fixed bar 303 to slide downward, so that the fixed bar 303 drives the friction block 304 to slide downward, and the fixed bar 303 compresses the reset spring 306, and utilizes the elastic force of the reset spring 306 and the friction resistance between the friction block 304 and the inner wall of the buffer chamber 301 , to buffer and consume the impact force of the water flow, thereby preventing the butterfly plate 2 from being damaged by excessive pressure. After the water flow inside the pipeline calms down, the pressure inside the valve body is reduced to a normal value. At this time, the reset spring 306 rebounds and pushes the fixing bar 303 to slide upward, thereby driving the piston 302 and the friction block 304 to reset. Through the elastic force of the squeezing spring 305, the two groups of friction blocks 304 are pushed to fit more closely with the inner wall of the buffer bin 301, ensuring that a certain friction force needs to be overcome in the process of the friction blocks 304 sliding up and down.

[0033] During use, after the two sets of sealing strips 206 are worn, the elastic force of the first spring sheet 207 pushes the two sets of sealing strips 206 to always fit against the inner wall of the valve body, thereby ensuring the sealing of the valve during subsequent use, extending the service life of the valve, reducing the maintenance frequency of the valve, and thus reducing the use cost of the valve. The parts not involved in the device are the same as the prior art or can be implemented using the prior art.

[0034] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A wafer-type three-eccentric hard-sealed butterfly valve, comprising a main valve body (1), characterized in that: The inner wall of the main valve body (1) is rotatably connected to a butterfly plate (2); The butterfly plate (2) comprises a rotating shaft (201), wherein the rotating shaft (201) is rotatably connected to the inner wall of the main valve body (1), the outer wall of the rotating shaft (201) is fixedly connected to a rear plate (202), the side wall of the rear plate (202) is fixedly connected to a central fixing column (203), the end of the central fixing column (203) is fixedly connected to a front plate (204), two groups of first sliding plates (205) are arranged between the front plate (204) and the rear plate (202), the two groups of first sliding plates (205) are slidably fitted on the side wall of the rear plate (202), the side wall of each group of the first sliding plates (205) is respectively fixedly connected to a group of sealing strips (206), and two groups of first spring plates (207) are fixedly connected between the two groups of the first sliding plates (205).

2. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 1 is characterized in that: A second sliding sheet (208) is arranged between the front plate (204) and the rear plate (202); two groups of the second sliding sheets (208) are slidably fitted between the first sliding sheet (205) and the front plate (204); and two groups of second spring sheets (210) are fixedly connected between the two groups of the second sliding sheets (208).

3. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 2 is characterized in that: A group of sealing rubber blocks (209) are fixedly connected to the side walls of each group of the second sliding sheets (208), and the sealing rubber blocks (209) are tightly fitted on the ends of the two groups of sealing strips (206). The sealing rubber blocks (209) are wider at one end close to the central fixing column (203) and narrower at one end away from the central fixing column (203).

4. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 1 is characterized in that: The bottom end of the valve body is connected to a buffer mechanism (3), the buffer mechanism (3) comprises a buffer bin (301), and the buffer bin (301) is connected to the bottom end of the main valve body (1).

5. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 4 is characterized in that: The inner wall of the buffer bin (301) is slidably connected to a piston (302), the bottom end of the piston (302) is fixedly connected to a fixing bar (303), the inner wall of the fixing bar (303) is slidably connected to two groups of friction blocks (304) extending to the outside of the fixing bar (303), one end of the two groups of friction blocks (304) located outside the fixing bar (303) is attached to the inner wall of the buffer bin (301), and the friction blocks (304) are provided with grooves at the contact positions with the buffer bin (301).

6. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 5 is characterized in that: A compression spring (305) located inside the fixing strip (303) is fixedly connected between the two groups of friction blocks (304).

7. The wafer-type three-eccentric hard-sealed butterfly valve according to claim 5 is characterized in that: The bottom end of the fixing strip (303) is fixedly connected to one end of a return spring (306), and the other end of the return spring (306) is fixedly connected to the bottom end of the inner wall of the buffer bin (301).

Images