Eccentric butterfly valve sealing structure convenient to disassemble

Abstract

The utility model discloses an eccentric butterfly valve sealing structure convenient to disassemble, which comprises a valve body, a butterfly plate and a valve shaft, the valve shaft radially penetrates into the valve body and is fixed with the butterfly plate, a valve seat is arranged in the valve body, a sealing ring matched with the valve seat is arranged on the butterfly plate, the valve seat comprises a sealing surface and a buffer surface, and the sealing surface and the buffer surface are positioned in a medium flow channel. The sealing face is located on the liquid inlet side of the medium flow channel and abuts against the butterfly plate to form valve sealing, the buffering face is located on the outlet side, and the sealing face and the buffering face are adjacent and shrink towards the middle. According to the structural design of the eccentric butterfly valve, through structural improvement of the valve body, the valve shaft and the butterfly plate can be disassembled and assembled without disassembling the driving unit, the maintenance and installation efficiency of the valve can be improved, and in addition, the water hammer strength is reduced by adjusting the structure of the valve seat.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to an eccentric butterfly valve easy-to-disassemble sealing structure. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. It can be used for on-off control of low-pressure pipeline media. A butterfly valve refers to a valve whose closing member (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing. The butterfly valve mainly plays a cutting and throttling role in the pipeline.

[0003] After a butterfly valve has been used for a long time, the seal between the butterfly valve body and the butterfly plate will age, causing the butterfly valve to leak even when it is closed. Therefore, the butterfly valve needs to be maintained regularly. Currently, butterfly valves are generally maintained by dismantling the drive structure from above. The drive unit needs to be aligned with the valve shaft during installation. Frequent disassembly and assembly can easily cause the drive unit to be eccentric with the valve shaft hole of the valve body, thereby causing the drive unit to be installed misaligned, which affects the valve drive. Utility Model Content

[0004] In view of the existing technology, the purpose of the present invention is to provide a structural design of an eccentric butterfly valve. By improving the structure of the valve body, not only can the valve shaft and butterfly plate be disassembled and assembled without removing the drive unit, but also the maintenance and installation efficiency of the valve can be improved. In addition, the valve seat structure can be adjusted to reduce the water hammer intensity.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: an eccentric butterfly valve easy-to-disassemble sealing structure, including a valve body, a butterfly plate and a valve shaft, the valve shaft radially penetrates into the valve body and is fixed to the butterfly plate, a valve seat is provided in the valve body, and a sealing ring matching the valve seat is provided on the butterfly plate, the valve seat includes a sealing surface and a buffer surface, the sealing surface and the buffer surface are located in the medium flow channel, the sealing surface is located on the liquid inlet side of the medium flow channel and abuts the butterfly plate to form a valve seal, the buffer surface is located on the outlet side, and the sealing surface and the buffer surface are adjacent to each other and are set to be narrowed towards the middle.

[0006] As a further configuration of the above solution, the sealing ring and the valve seat are both fastened to the butterfly plate and the valve body by bolts, and the bolts of the sealing ring and the valve seat are both fixed from the outlet side.

[0007] As a further configuration of the above solution, a sealing ring groove is further provided on the side of the valve seat that contacts the valve body, and a sealing ring is provided in the sealing ring groove.

[0008] As a further configuration of the above solution, a shaft sleeve is sleeved on the valve shaft, and the shaft sleeve is arranged between the valve shaft and the valve body.

[0009] As a further configuration of the above solution, a valve cover, a pressure cover and a sealing packing are further provided on the valve body. The valve cover is fixedly mounted on the valve body and abuts against the pressure cover by screws.

[0010] As a further configuration of the above solution, the valve body further includes a bottom cover and a wear-resistant block, wherein the bottom cover is used to close the opening at the bottom of the valve body, and the wear-resistant block is arranged on the inner side of the bottom cover and is used to abut the end of the valve shaft.

[0011] Beneficial effects: The structural setting of the valve seat sealing surface and the buffer surface of the eccentric butterfly valve of the utility model can buffer and reduce the intensity of water hammer. In addition, the structure of the butterfly plate valve seat inside the valve body can be disassembled and assembled from the outlet side, which is convenient for maintenance and disassembly. A removable bottom cover is provided at the bottom of the valve body. Through the structure of the bottom cover, the valve shaft can also be disassembled from the bottom when the drive unit does not need to be removed, which is convenient for the disassembly and maintenance of the valve shaft and butterfly plate, and is easy to repair and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the butterfly valve of this utility model.

[0013] Figure 2 Schematic diagram of the internal structure of the butterfly valve of this embodiment.

[0014] Figure 3 Schematic diagram of the horizontal cross section of the butterfly valve of this embodiment.

[0015] Figure numerals: 1, valve body; 11, bottom cover; 12, wear-resistant block; 2, butterfly plate; 3, valve shaft; 31, shaft sleeve; 4, valve seat; 40, medium flow channel; 41, sealing surface; 42, buffer surface; 43, sealing ring groove; 5, sealing ring; 50, bolt; 6, valve cover; 61, pressure cover; 62, sealing packing. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0017] like Figure 1-3The eccentric butterfly valve shown has a disassembly sealing structure, including a valve body 1, a butterfly plate 2 and a valve shaft 3. The valve shaft 3 radially penetrates the valve body 1 and is fixed to the butterfly plate 2. A valve seat 4 is provided in the valve body 1, and a sealing ring 5 matching the valve seat 4 is provided on the butterfly plate 2. The valve seat 4 includes a sealing surface 41 and a buffer surface 42. The sealing surface 41 and the buffer surface 42 are located in the medium flow channel 40. The sealing surface 41 is located on the liquid inlet side of the medium flow channel 40 and abuts the butterfly plate 2 to form a valve seal. The buffer surface 42 is located on the outlet side. The sealing surface 41 and the buffer surface 42 are adjacent to each other and are set to be narrowed towards the middle.

[0018] As a further configuration of the above solution, the sealing ring 5 and the valve seat 4 are both fastened to the butterfly plate 2 and the valve body 1 by bolts 50, and the bolts 50 of the sealing ring 5 and the valve seat 4 are both fixed from the outlet side.

[0019] As a further configuration of the above solution, a sealing ring groove 43 is further provided on the side of the valve seat 4 that contacts the valve body 1 , and a sealing ring is provided in the sealing ring groove 43 .

[0020] As a further configuration of the above solution, a shaft sleeve 31 is sleeved on the valve shaft 3 , and the shaft sleeve 31 is arranged between the valve shaft 3 and the valve body 1 .

[0021] As a further configuration of the above solution, a valve cover 6, a gland 61 and a sealing packing 62 are further provided on the valve body 1. The valve cover 6 is fixedly mounted on the valve body 1 by screws and abuts against the gland 61.

[0022] As a further configuration of the above scheme, the valve body 1 also includes a bottom cover 11 and a wear-resistant block 12. The bottom cover 11 is used to close the opening at the bottom of the valve body 1, and the wear-resistant block 12 is arranged on the inner side of the bottom cover 11 and is used to abut the end of the valve shaft 3.

[0023] The eccentric butterfly valve of this embodiment is easy to disassemble the sealing structure solution. Figure 1-3 When the cam 2 is in the closed position, the cam 2 is in the closed position, and the cam 2 is in the closed position, so that the cam 2 is in the closed position and the cam 2 is in the closed position. When the cam 2 is in the closed position, the cam 2 is in the closed position, and the cam 2 is in the closed position, so that the cam 2 is in the closed position and the cam 2 is in the closed position. When the cam 2 is in the closed position, the cam 2 is in the closed position, and the cam 2 is in the closed position, so that the cam 2 is in the closed position and the cam 2 is in the closed position.

[0024] Furthermore, before the butterfly plate 2 of the butterfly valve of this embodiment is placed into the valve body 1, the sealing substructure can be installed first. After the above-mentioned structure is fixed and installed, the valve seat 4 is installed into the medium flow channel 40 of the valve body 1 to complete the installation and use of the valve.

[0025] The above-mentioned structural design allows the butterfly valve of this embodiment to be disassembled for maintenance or replacement of the sealing structure of the butterfly plate 2 without removing the drive unit. The valve seat 4 and the sealing ring 5 can be quickly removed from the outlet side of the medium flow channel 40 to maintain the sealing structure of the butterfly plate 2 and the valve seat 4. When the butterfly plate 2 and the valve shaft 3 need to be disassembled, it is only necessary to loosen the screws to remove the valve shaft 3 and the butterfly plate 2, and then loosen the valve cover 6 (to release the pressure on the sealing packing), and then remove the bottom cover 11 to take out the valve shaft 3 from the bottom, and then the interior of the valve body 1 can be disassembled and repaired without removing the drive unit.

[0026] In addition, as described above, the butterfly valve seat 4 of this embodiment includes a sealing surface 41 and a buffer surface 42. The sealing surface 41 and the buffer surface 42 are located in the medium flow channel 40. The sealing surface 41 is located on the liquid inlet side of the medium flow channel 40 and abuts against the butterfly plate 2 to form a valve seal. The buffer surface 42 is located on the outlet side. Figure 2 As shown, the sealing surface 41 and the buffer surface 42 of the cross-sectional structure of the valve seat 4 are adjacent and are arranged to be narrowed toward the middle. The advantage of this structure is that the intensity of water hammer can be buffered and reduced by the inclined buffer surface 42. In addition, the sealing ring 5 and the valve seat 4 are both fastened to the butterfly plate 2 and the valve body 1 with bolts 50, and the bolts 50 of the sealing ring 5 and the valve seat 4 are both fixed from the outlet side, which can facilitate the maintenance and replacement of the sealing substructure that is most susceptible to aging and damage.

[0027] As a further arrangement of the above scheme, a sealing ring groove 43 is further provided on the side of the valve seat 4 in contact with the valve body 1, and a sealing ring is provided in the sealing ring groove 43. The sealing ring is mainly used to seal between the valve seat 4 and the valve body 1 when the valve seat 4 is installed to prevent the medium from leaking from the installation gap between the two.

[0028] As a further arrangement of the above scheme, a shaft sleeve 31 is sleeved on the valve shaft 3, and the shaft sleeve 31 is arranged between the valve shaft 3 and the valve body 1. The shaft sleeve 31 replaces the direct contact wear between the valve shaft 3 and the valve body 1, thereby reducing the error of the eccentric angle of the valve shaft 3 caused by the wear of the valve body 1.

[0029] As a further configuration of the above scheme, the valve body 1 also includes a bottom cover 11 and a wear-resistant block 12. The bottom cover 11 is used to close the opening at the bottom of the valve body 1, and the wear-resistant block 12 is arranged on the inner side of the bottom cover 11 and is used to abut the end of the valve shaft 3. The wear-resistant block 12 can abut the end of the valve shaft 3, and the thickness of the wear-resistant block 12 can be adjusted according to actual installation.

[0030] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An eccentric butterfly valve disassembly sealing structure, comprising a valve body (1), a butterfly plate (2) and a valve shaft (3), wherein the valve shaft (3) radially penetrates the valve body (1) and is fixed to the butterfly plate (2), and is characterized in that: A valve seat (4) is provided in the valve body (1), and a sealing ring (5) matching the valve seat (4) is provided on the butterfly plate (2). The valve seat (4) includes a sealing surface (41) and a buffer surface (42). The sealing surface (41) and the buffer surface (42) are located in the medium flow channel (40). The sealing surface (41) is located on the liquid inlet side of the medium flow channel (40) and abuts against the butterfly plate (2) to form a valve seal. The buffer surface (42) is located on the outlet side. The sealing surface (41) and the buffer surface (42) are adjacent to each other and are arranged to be narrowed toward the middle.

2. The eccentric butterfly valve easy-to-disassemble sealing structure according to claim 1, characterized in that: The sealing ring (5) and the valve seat (4) are both fastened to the butterfly plate (2) and the valve body (1) by bolts (50), and the bolts (50) of the sealing ring (5) and the valve seat (4) are both fixed from the outlet side.

3. The eccentric butterfly valve easy-to-disassemble sealing structure according to claim 1, characterized in that: A sealing ring groove (43) is further provided on the side of the valve seat (4) that contacts the valve body (1), and a sealing ring is provided in the sealing ring groove (43).

4. The eccentric butterfly valve easy-to-disassemble sealing structure according to claim 1, characterized in that: A shaft sleeve (31) is sleeved on the valve shaft (3), and the shaft sleeve (31) is arranged between the valve shaft (3) and the valve body (1).

5. The eccentric butterfly valve easy-to-disassemble sealing structure according to claim 1, characterized in that: The valve body (1) is further provided with a valve cover (6), a gland (61) and a sealing packing (62); the valve cover (6) is fixedly mounted on the valve body (1) by screws and abuts against the gland (61).

6. The eccentric butterfly valve easy-to-disassemble sealing structure according to claim 1, characterized in that: The valve body (1) further comprises a bottom cover (11) and a wear-resistant block (12), wherein the bottom cover (11) is used to close the opening at the bottom of the valve body (1), and the wear-resistant block (12) is arranged on the inner side of the bottom cover (11) and is used to abut the end of the valve shaft (3).

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