Double-eccentric butterfly valve

Abstract

The utility model discloses a double eccentric butterfly valve which comprises a valve body and a valve rod, connecting flanges are arranged at the two ends of the valve body, a valve plate is arranged in the valve body, a sealing ring is installed on the valve plate, an inserting groove is formed in the valve plate in a penetrating mode, an inserting portion is arranged at the lower end of the valve rod, and a connecting portion is arranged at the top of the valve body. The interior of the valve body is communicated with the connecting part, the upper end of the valve rod penetrates through the connecting part, the connecting part is sleeved with a rotatable linkage frame, the side walls of the two transverse sides of the linkage frame are provided with a pair of first through holes, the side walls of the two longitudinal sides of the linkage frame are provided with a pair of openings, and a second through hole is formed in the upper portion of the valve rod; the valve further comprises a linkage inserting column, the linkage inserting column is inserted into the first through hole and the second through hole, locking structures used for axially locking or unlocking the linkage inserting column are arranged on the two sides of the upper end of the valve rod, a mounting base is connected to the top of the linkage frame, a third through hole is formed in the middle of the mounting base, and a rotating handle is arranged on the mounting base.

Description

Technical Field

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

[0002] Double eccentric butterfly valves, also known as high-performance butterfly valves, are mainly used for drainage systems in water plants, power plants, steel mills, chemical plants, water source projects, and environmental facilities. They are particularly suitable for use in water pipelines as regulating and shut-off devices. Compared to centerline butterfly valves, double eccentric butterfly valves are more resistant to high pressure, have a longer service life, and offer better stability.

[0003] In the present technology, valve plates are usually equipped with sealing rings to improve the sealing performance when the fluid is closed. However, the sealing rings on the valve plate will wear out due to friction after long-term use. However, most valve plates and rotating rods are integrated structures, which makes it inconvenient to replace and repair the sealing rings, valve rods, and valve plates. The replacement is difficult and inconvenient to operate. Utility Model Content

[0004] The purpose of this invention is to provide a double eccentric butterfly valve to solve the problems mentioned in the background art.

[0005] To solve the above technical problems, this utility model adopts the following technical solution: a double eccentric butterfly valve, comprising a valve body and a valve stem, wherein the valve body has connecting flanges at both ends, a valve plate is provided inside the valve body, a sealing ring is installed on the end face of the valve plate, and a reinforcing member is installed on the surface of the valve plate by screws, a rectangular insertion groove is passed through the inside of the valve plate, the lower end of the valve stem is provided with an insertion part that inserts into the insertion groove, the top of the valve body is provided with an annular connecting part, the inside of the valve body is connected to the connecting part, the upper end of the valve stem passes through the connecting part, and a rotatable coupling is sleeved on the connecting part. The linkage frame has a pair of first through holes arranged opposite each other on its transverse side walls and a pair of openings on its longitudinal side walls. The valve stem has a second through hole at both ends corresponding to the positions of the pair of first through holes. It also includes a linkage pin, which is inserted into the first and second through holes. The upper end of the valve stem has locking structures on both sides for axially locking or unlocking the linkage pin. The top of the linkage frame is connected to a mounting base. The mounting base has a third through hole in the middle for the valve stem to pass through. The mounting base is connected to the linkage frame by bolts. The mounting base has a rotating handle.

[0006] Using the above technical solution, the valve body is connected to the corresponding pipeline via a flange, and the valve stem and valve disc are connected by a plug-in joint and circumferentially locked. During operation, turning the handle rotates the mounting base, which in turn rotates the linkage frame. The linkage pin circumferentially locks the linkage frame and valve stem, and the locking structure axially locks the valve stem, allowing it to be locked within the first and second through holes. The rotation of the linkage frame drives the valve stem to rotate, which in turn drives the valve plate to rotate, thus opening and closing the valve. When the valve stem needs to be disassembled, the linkage pin is axially unlocked through the locking structure, and the plug-in screw is removed from the first and second through holes, releasing the circumferential lock between the linkage frame and the valve stem. At this point, the valve stem can be pulled upwards and removed through the third through hole, separating the valve stem from the valve plate. This allows for quick disassembly and installation of the sealing ring, valve stem, and valve plate, making operation convenient, labor-saving, and easy for replacement and maintenance.

[0007] As a further optimization of this utility model, the locking structure includes a rotatable strip baffle disposed on the surface of the linkage frame. After the strip baffle rotates, it can block the first through hole to achieve axial locking of the linkage pin.

[0008] As a further optimization of this utility model, a fixing block is provided on one side of the first through hole on the surface of the linkage frame, a slot is provided on the fixing block, and a locking block is provided on the strip baffle.

[0009] Using the above technical solution, after the strip baffle rotates, the locking block can be connected and fixed with the locking slot block, thereby covering both ends of the strip baffle and locking it circumferentially and by rotation.

[0010] As a further optimization of this utility model, a sealing ring is provided inside the connecting part.

[0011] By adopting the above technical solutions, the sealing performance between the valve stem and the valve body is improved.

[0012] As a further optimization of this utility model, the upper end of the valve stem is provided with several convex rings.

[0013] By adopting the above technical solution, a convex ring is provided to facilitate pushing the valve stem to remove it.

[0014] As a further optimization of this utility model, the third through hole is provided with an internal thread; it also includes a sealing post, which is provided with an external thread and threadedly connected to the third through hole, and the top of the sealing post is provided with several protrusions along the circumferential direction.

[0015] By adopting the above technical solution, the sealing column is set to seal the through hole three, preventing the valve stem from accidentally falling out of the through hole three when it is not tightly installed, thus playing a safety role.

[0016] The beneficial effects of this utility model are as follows: The valve body is connected to the corresponding pipeline through a flange, and the valve stem and valve disc are connected by a plug-in joint and circumferentially locked. During operation, turning the handle rotates the mounting base, which in turn rotates the linkage frame. The linkage plug locks the linkage frame and valve stem circumferentially, and the locking structure locks the valve stem axially, allowing the valve stem to be locked in the first and second through holes. The rotation of the linkage frame drives the valve stem to rotate, thereby driving the valve plate to rotate, realizing the opening and closing of the valve. When it is necessary to disassemble the valve stem, the linkage plug is axially unlocked through the locking structure, and the plug-in screw is taken out from the first and second through holes, releasing the circumferential lock between the linkage frame and the valve stem. At this time, the valve stem can be pulled upwards and taken out through the third through hole. This separation of the valve stem and valve plate realizes the quick disassembly and installation of the sealing ring, valve stem, and valve plate, making the operation convenient and labor-saving, and facilitating replacement and maintenance. Attached Figure Description

[0017] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0018] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0019] Figure 3 This is a partial cross-sectional view of the structure of this utility model from a second perspective.

[0020] Figure 4 This is a top view of the valve plate in this utility model.

[0021] Figure 5 This is a schematic diagram of the valve stem in this utility model.

[0022] The labels in the diagram have the following meanings: 1. Valve body; 11. Valve disc; 111. Sealing ring; 112. Insertion groove; 12. Valve stem; 121. Raised ring; 122. Insertion part; 2. Connecting part; 21. Sealing ring; 3. Linkage frame; 31. Opening; 41. First through hole; 42. Second through hole; 43. Third through hole; 5. Linkage insert; 6. Strip baffle; 61. Locking block; 7. Fixing block; 71. Locking groove; 8. Mounting base; 81. Rotating handle; 9. Sealing post. Detailed Implementation

[0023] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0024] See appendix Figure 1-5The present embodiment of this utility model further includes: a double eccentric butterfly valve, comprising a valve body 1 and a valve stem 12, with connecting flanges at both ends of the valve body 1, a valve plate inside the valve body 1, and a sealing ring 111 installed on the end face of the valve plate;

[0025] The surface of the valve plate is fitted with reinforcing parts by screws. The inside of the valve plate has a rectangular insertion groove 112. The lower end of the valve stem 12 is provided with an insertion part 122 that is inserted into the insertion groove 112. The top of the valve body 1 is provided with an annular connecting part 2. The valve body 1 is connected to the connecting part 2. The upper end of the valve stem 12 passes through the connecting part 2. The connecting part 2 is provided with a sealing ring 21 to increase the sealing between the valve stem 12 and the valve body 1.

[0026] A rotatable linkage frame 3 is fitted on the connecting part 2. The linkage frame 3 has a pair of first through holes 41 arranged opposite each other on the transverse side walls and a pair of openings 31 on the longitudinal side walls. The valve stem 12 has a second through hole 42 at both ends corresponding to the positions of the pair of first through holes 41. Furthermore, the upper end of the valve stem 12 has several protruding rings 121.

[0027] It also includes a linkage pin 5, which is inserted into the first through hole 41 and the second through hole 42. The upper end of the valve stem 12 is provided with locking structures on both sides for axially locking or unlocking the linkage pin 5. Specifically, the locking structure includes a rotatable strip baffle 6 on the surface of the linkage frame 3. After the strip baffle 6 rotates, it can block the first through hole 41 to achieve axial locking of the linkage pin 5. A fixing block 7 is provided on one side of the first through hole 41 on the surface of the linkage frame 3. A slot 71 is provided on the fixing block 7, and a locking block 61 is provided on the strip baffle 6.

[0028] The top of the linkage frame 3 is connected to a mounting base 8. The mounting base 8 has a third through hole 43 in the middle for the valve stem 12 to pass through. The mounting base 8 is connected to the linkage frame 3 by bolts. The mounting base 8 has a rotating handle 81. Furthermore, the third through hole 43 has internal threads. It also includes a sealing post 9. The sealing post 9 has external threads and is threaded to the third through hole 43. The top of the sealing post 9 has several protrusions along the circumference. The sealing post 9 is set to seal the third through hole and prevent the valve stem 12 from accidentally falling out of the third through hole when it is not tightened, thus playing a safety role.

[0029] The principle of this utility model is as follows: the valve body 1 is connected to the corresponding pipeline through a flange, the valve stem 12 and the valve disc 11 are connected by plug-in and circumferentially locked. During operation, the handle 81 is turned to rotate the mounting base 8, which in turn drives the linkage frame 3 to rotate. The linkage plug 5 circumferentially locks the linkage frame 3 and the valve stem 12. The locking structure locks the valve stem 12 axially, so that the valve stem 12 can be locked in the first through hole 41 and the second through hole 42. The rotation of the linkage frame 3 drives the valve stem 12 to rotate, thereby driving the valve plate to rotate, realizing the opening and closing of the valve.

[0030] When it is necessary to disassemble the valve stem 12, the linkage pin 5 is axially unlocked through the locking structure: rotate the strip baffle 6, the locking block 61 separates from the locking groove 71, the strip baffle 6 rotates to release the obstruction of the linkage pin 5, and then the plug screw is taken out from the first through hole 41 and the second through hole 42, thereby releasing the circumferential lock between the linkage frame 3 and the valve stem 12. At this time, the valve stem 12 can be pulled out upwards and taken out through the third through hole 43. The convex ring 121 is provided to facilitate pushing the valve stem 12 to take it out. At this time, the valve stem 12 is separated from the valve plate, realizing the quick disassembly and installation of the sealing ring 111, valve stem 12, and valve plate. The operation is convenient and labor-saving, and easy to replace and maintain.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A double eccentric butterfly valve, comprising a valve body (1) and a valve stem (12), wherein the valve body (1) has connecting flanges at both ends, a valve plate is provided inside the valve body (1), and a sealing ring (111) is installed on the end face of the valve plate, characterized in that, The valve plate has a rectangular insertion groove (112) running through its interior. The lower end of the valve stem (12) has an insertion part (122) that engages with the insertion groove (112). The top of the valve body (1) has an annular connecting part (2). The valve body (1) is internally connected to the connecting part (2). The upper end of the valve stem (12) passes through the connecting part (2). A rotatable linkage frame (3) is fitted on the connecting part (2). The linkage frame (3) has a pair of opposing first through holes (41) on its transverse sidewalls and a pair of openings (31) on its longitudinal sidewalls. The valve stem (12) has a second through hole (42) at its upper end, with both ends corresponding to the positions of a pair of first through holes (41); it also includes a linkage pin (5), which is inserted into the first through hole (41) and the second through hole (42). The upper end of the valve stem (12) has a locking structure on both sides for axially locking or unlocking the linkage pin (5). The top of the linkage frame (3) is connected to a mounting base (8), and the middle of the mounting base (8) has a third through hole (43) for the valve stem (12) to pass through. The mounting base (8) has a rotating handle (81).

2. The double eccentric butterfly valve according to claim 1, characterized in that, The locking structure includes a rotatable strip baffle (6) on the surface of the linkage frame (3). After the strip baffle (6) rotates, it can block the first through hole (41) to achieve axial locking of the linkage pin (5).

3. A double eccentric butterfly valve according to claim 2, characterized in that, The linkage frame (3) has a fixing block (7) on one side of the first through hole (41), the fixing block (7) has a slot (71), and the strip baffle (6) has a locking block (61).

4. A double eccentric butterfly valve according to claim 1, characterized in that, A sealing ring (21) is provided inside the connecting part (2).

5. A double eccentric butterfly valve according to claim 1, characterized in that, The upper end of the valve stem (12) is provided with several protruding rings (121).

6. A double eccentric butterfly valve according to claim 1, characterized in that, The third through hole (43) is provided with an internal thread; it also includes a sealing post (9), which is provided with an external thread and is threadedly connected to the third through hole (43), and the top of the sealing post (9) is provided with several protrusions along the circumferential direction.

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