Telescopic butterfly valve

Abstract

The utility model belongs to the field of butterfly valves, and particularly discloses a telescopic butterfly valve which comprises a butterfly valve body, a telescopic pipe and an adjusting piece, a valve port communicated with a valve cavity is formed in the butterfly valve body, and the telescopic pipe is arranged at the valve port and attached to the inner wall of the valve port. The adjusting piece is connected between the butterfly valve body and the telescopic pipe so as to adjust the position of the telescopic pipe relative to the butterfly valve body. A medium pressure sealing structure is arranged between the telescopic pipe and the inner wall of the valve port. Sealing is conducted through the medium pressure sealing structure between the telescopic pipe and the inner wall of the valve port, the sealing performance can be enhanced through the medium pressure sealing structure under the action of medium pressure, pressing through a pressing plate is not needed, the structure is simplified, the production cost is reduced, assembling is more convenient, and the assembling efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of butterfly valves, and more specifically, relates to a telescopic butterfly valve. Background Art

[0002] A butterfly valve is a commonly used valve. Installed on a pipeline, it can connect or cut off the flow of the medium in the pipeline. The opening and closing member of the butterfly valve is a butterfly plate, and the butterfly plate and the valve shaft make a rotational movement to realize the opening and closing of the pipeline. The telescopic butterfly valve not only has the function of a butterfly valve but also has a certain amount of telescopic capacity, which is convenient for adjustment during installation to be applicable to different pipelines. At the same time, it can compensate for the thermal expansion and contraction of the pipeline and prevent pipeline damage.

[0003] A related technology discloses a telescopic butterfly valve, which includes a butterfly valve body, a telescopic pipe installed on the butterfly valve body, as well as a sealing ring and a pressing plate. The pressing plate is used to fix the sealing ring in the sealing groove formed by the valve body and the telescopic pipe. By using bolts to increase the pressing force of the pressing plate, the interference fit amount of the sealing ring is increased to make up for the processing error and achieve the sealing effect. This telescopic butterfly valve is equipped with a pressing plate and bolts, and the interference fit amount of the sealing ring is increased by adjusting the pressing force of the pressing plate. The assembly is cumbersome and difficult, and at the same time, the cost is increased. Utility Model Content

[0004] Aiming at the defects of the prior art, this application provides a telescopic butterfly valve, aiming to solve the problems of the existing telescopic butterfly valve with complex structure, cumbersome assembly and high cost.

[0005] A telescopic butterfly valve provided by this application specifically includes a butterfly valve body, a telescopic pipe and an adjusting member. A valve port communicating with the valve cavity is opened on the butterfly valve body. The telescopic pipe is arranged at the valve port and fits with the inner wall of the valve port. The adjusting member is connected between the butterfly valve body and the telescopic pipe to adjust the position of the telescopic pipe relative to the butterfly valve body; a medium pressure sealing structure is arranged between the telescopic pipe and the inner wall of the valve port.

[0006] Through the above technical solution conceived by this application, compared with the prior art, since this application arranges the medium pressure sealing structure between the telescopic pipe and the inner wall of the valve port for sealing, there will be no interference between the telescopic pipe and the medium pressure sealing structure during adjustment, and the medium pressure sealing structure can enhance the sealing performance under the action of the medium pressure. There is no need to use a pressing plate for pressing, which simplifies the structure, reduces the production cost, and is more convenient during assembly, improving the assembly efficiency.

[0007] As a further preferred option, the medium pressure sealing structure is a Gleitring.

[0008] By adopting the above technical solution, the Gleitring has both low friction and high extrusion resistance, is suitable for parts with bidirectional pressure, and can provide good sealing performance.

[0009] As a further preference, the medium pressure sealing structure is a sealing ring with a lip seal part on one side, and the lip seal part is located on the side of the sealing ring close to the valve cavity.

[0010] By adopting the above technical solution, when there is only one sealing ring, the lip seal part is located on the side of the sealing ring close to the valve cavity. The contact area between the lip seal part and water is relatively large. Since the pressure is greater on one side, water will squeeze the lip seal part to deform, ensuring reliable internal sealing between the lip seal part and the telescopic pipe.

[0011] As a further preference, the medium pressure sealing structure is a sealing ring with a lip seal part on one side. There are two sealing rings, and the two sealing rings are arranged in sequence along the axis direction of the telescopic pipe. The two lip seal parts are respectively located on the sides of the two sealing rings away from each other.

[0012] By adopting the above technical solution, when there are two sealing rings, the lip seal parts on both sides can deform under pressure, enhancing the sealing performance and achieving a two-way sealing effect.

[0013] As a further preference, the width of the lip seal part is greater than the thickness of the sealing ring.

[0014] By adopting the above technical solution, both sides of the lip seal part fit more closely to the outer wall of the telescopic pipe and the inner wall of the valve port, resulting in better sealing performance.

[0015] As a further preference, both the sealing ring and the lip seal part are made of soft rubber and are of an integrally formed structure.

[0016] By adopting the above technical solution, the installation of both the sealing ring and the lip seal part can be completed simultaneously, and the installation is convenient, improving the installation efficiency.

[0017] As a further preference, a first clamping groove for embedding the medium pressure sealing structure is formed on the inner wall of the valve port.

[0018] By adopting the above technical solution, the medium pressure sealing structure is located in the first clamping groove on the inner wall of the valve port, with a stable position and not moving with the telescopic pipe, resulting in a longer service life.

[0019] As a further preference, a second clamping groove for embedding the medium pressure sealing structure is formed on the outer wall of the telescopic pipe.

[0020] By adopting the above technical solution, the medium pressure sealing structure can be disassembled together with the telescopic pipe, facilitating maintenance and replacement.

[0021] As a further preference, there are multiple adjusting members, and the multiple adjusting members are arranged around the circumference of the telescopic pipe.

[0022] By adopting the above technical solution, the circumferential side of the telescopic pipe is connected to the butterfly valve body through the adjusting member, so that the position of the telescopic pipe is stably connected after adjustment, and the connection effect is better.

[0023] As a further preference, the adjusting member includes a screw rod and a plurality of nuts. Through holes for the screw rod to pass through are formed on both the telescopic pipe and the butterfly valve body. The screw rod passes through the through holes on the telescopic pipe and the butterfly valve body and is fixed by nuts.

[0024] By adopting the above technical solution, after adjusting the relative position between the telescopic pipe and the butterfly valve body, the positions of both on the screw rod are fixed by nuts, so that the position between the telescopic pipe and the butterfly valve body is more stable.

[0025] Generally speaking, compared with the prior art, the above technical solution conceived by the present application mainly has the following technical advantages:

[0026] 1. In the present application, the medium pressure sealing structure is arranged between the telescopic pipe and the inner wall of the valve port to seal the gap between the telescopic pipe and the inner wall of the valve port, avoiding leakage of the liquid in the pipeline. When the telescopic pipe is adjusted in position, there will be no interference with the medium pressure sealing structure, and the medium pressure sealing structure can enhance the sealing performance under the action of the medium pressure. The installation of the medium pressure sealing structure does not require pressing with a pressing plate, simplifying the sealing structure between the telescopic pipe and the inner wall of the valve port, reducing the production cost, and being more convenient during assembly, improving the assembly efficiency.

[0027] 2. In the present application, when there are two sealing rings, the lip-shaped sealing parts on both sides can be deformed under pressure, enhancing the sealing performance and achieving a two-way sealing effect.

[0028] 3. In the present application, the medium pressure sealing structure is arranged in the first card slot on the inner wall of the valve port or in the second card slot on the outer wall of the telescopic pipe as required. When arranged in the first card slot, the position is stable and does not move with the telescopic pipe, with a longer service life. When arranged in the second card slot, it can be disassembled together with the telescopic pipe, facilitating maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the telescopic butterfly valve provided in Embodiment 1;

[0030] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0031] Figure 3 is a schematic diagram of the overall structure of the telescopic butterfly valve provided in Embodiment 2;

[0032] Figure 4 is Figure 3Schematic diagram of the enlarged structure of part B

[0033] In all the drawings, the same reference numerals are used to denote the same elements or structures, where:

[0034] 1. Butterfly valve body; 11. Valve cavity; 12. Valve port; 13. First clamping groove; 2. Expansion pipe; 21. Second clamping groove; 3. Adjusting member; 31. Screw rod; 32. Nut; 4. Medium pressure sealing structure; 41. Lip seal part; 42. Sealing ring Specific embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] Embodiment 1:

[0037] Referring to Figure 1 , a telescopic butterfly valve disclosed in the present application includes a butterfly valve body 1, an expansion pipe 2, an adjusting member 3 and a medium pressure sealing structure 4. A valve port 12 communicating with the valve cavity 11 is formed on the butterfly valve body 1. The expansion pipe 2 is arranged at the valve port 12 and fits with the inner wall of the valve port 12. The expansion pipe 2 is coaxially arranged with the valve port 12 and can be telescoped along the axial direction. The adjusting member 3 is connected between the butterfly valve body 1 and the expansion pipe 2 to adjust the position of the expansion pipe 2 relative to the butterfly valve body 1. In this embodiment, a plurality of adjusting members 3 are provided, and the plurality of adjusting members 3 are arranged around the circumference of the expansion pipe 2. The medium pressure sealing structure 4 is arranged between the expansion pipe 2 and the inner wall of the valve port 12. The medium pressure sealing structure 4 can enhance the sealing performance under the action of the medium pressure, without the need to use a pressing plate to press the sealing ring to improve the sealing performance, which simplifies the structure, reduces the production cost, and is more convenient during assembly.

[0038] Specifically, each adjusting member 3 includes a screw rod 31 and a plurality of nuts 32. Through holes for the screw rod 31 to pass through are formed on both the expansion pipe 2 and the butterfly valve body 1. After the screw rod 31 passes through the through holes on the expansion pipe 2 and the butterfly valve body 1, the position of the expansion pipe 2 relative to the screw rod 31 and the position of the butterfly valve body 1 relative to the screw rod 31 are fixed by the nuts 32, thereby completing the adjustment and fixation of the relative position between the expansion pipe 2 and the butterfly valve body 1.

[0039] In this embodiment, a first clamping groove 13 is formed on the inner wall of the valve port 12, and the medium pressure sealing structure 4 is embedded in the first clamping groove 13. The position of the medium pressure sealing structure 4 is stable and will not change with the movement of the expansion pipe 2, so as to extend its service life.

[0040] Further, the medium pressure sealing structure 4 is a Gleitring or a sealing ring 42 with a lip seal portion 41 on one side; when the medium pressure sealing structure 4 is the sealing ring 42, it can be set to one or two. When there is one sealing ring 42, the lip seal portion 41 is located on the side of the sealing ring 42 close to the valve cavity 11. The contact area between the lip seal portion 41 and the water in the pipeline is relatively large. Because the pressure is greater than the other side, the water will squeeze the lip seal portion 41 to deform, ensuring reliable internal sealing between the lip seal portion 41 and the telescopic pipe 2. When there are two sealing rings 42, the two sealing rings 42 are arranged in sequence along the axis of the telescopic pipe 2, and the two lip seal portions 41 are respectively located on the sides of the two sealing rings 42 away from each other. The lip seal portions 41 on both sides can deform under pressure. Specifically, the lip seal portion 41 close to the inside of the pipeline can deform under the action of water pressure to enhance the sealing performance. When the inside of the pipeline is in a vacuum, the lip seal portion 41 on the other side is deformed by air extrusion to enhance the sealing performance, thereby achieving a two-way sealing effect.

[0041] Furthermore, the width of the lip seal portion 41 is greater than the thickness of the sealing ring 42, making the two sides of the lip seal portion 41 fit more closely with the outer wall of the telescopic pipe 2 and the inner wall of the valve port 12. Both the sealing ring 42 and the lip seal portion 41 are made of soft rubber and are of an integrally formed structure, and the installation of the sealing ring 42 and the lip seal portion 41 is completed at the same time, improving the installation efficiency.

[0042] Embodiment 2:

[0043] The difference between this embodiment and Embodiment 1 is that a second card slot 21 is formed on the outer wall of the telescopic pipe 2, and the medium pressure sealing structure 4 is embedded in the second card slot 21. The medium pressure sealing structure 4 can change its position as the telescopic pipe 2 moves, and the medium pressure sealing structure 4 can be disassembled together with the telescopic pipe 2, thus facilitating maintenance and replacement.

[0044] It should be understood that the expressions such as "including" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit the existence of one or more additional functions, operations and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component or their combination, but cannot be interpreted as excluding the existence or the possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or their combinations.

[0045] It should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0047] In the present application, unless otherwise clearly specified and limited, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A telescopic butterfly valve, characterized in that: The butterfly valve comprises a butterfly valve body (1), a telescopic tube (2) and an adjusting member (3); the butterfly valve body (1) is provided with a valve port (12) which is connected to a valve cavity (11); the telescopic tube (2) is arranged at the valve port (12) and is in contact with the inner wall of the valve port (12); the adjusting member (3) is connected between the butterfly valve body (1) and the telescopic tube (2) to adjust the position of the telescopic tube (2) relative to the butterfly valve body (1); and a medium pressure sealing structure (4) is arranged between the telescopic tube (2) and the inner wall of the valve port (12).

2. A telescopic butterfly valve according to claim 1, characterized in that: The medium pressure sealing structure (4) is a Glay ring.

3. A telescopic butterfly valve according to claim 1, characterized in that: The medium pressure sealing structure (4) is a sealing ring (42) having a lip-shaped sealing portion (41) on one side, and the lip-shaped sealing portion (41) is located on a side of the sealing ring (42) close to the valve chamber (11).

4. A telescopic butterfly valve according to claim 1, characterized in that: The medium pressure sealing structure (4) is a sealing ring (42) having a lip-shaped sealing portion (41) on one side, and two sealing rings (42) are provided. The two sealing rings (42) are arranged in sequence along the axial direction of the telescopic tube (2), and the two lip-shaped sealing portions (41) are respectively located on the sides of the two sealing rings (42) that are away from each other.

5. A telescopic butterfly valve according to claim 3 or 4, characterized in that: The width of the lip seal portion (41) is greater than the thickness of the seal ring (42).

6. A telescopic butterfly valve according to claim 3 or 4, characterized in that: The sealing ring (42) and the lip-shaped sealing portion (41) are both soft rubber parts and are an integrally formed structure.

7. A telescopic butterfly valve as claimed in claim 2, 3 or 4, characterized in that: The inner wall of the valve port (12) is provided with a first groove (13) for the medium pressure sealing structure (4) to be embedded.

8. A telescopic butterfly valve as claimed in claim 2, 3 or 4, characterized in that: A second slot (21) for the medium pressure sealing structure (4) to be embedded is provided on the outer wall of the telescopic tube (2).

9. A telescopic butterfly valve according to any one of claims 1 to 4, characterized in that: A plurality of the adjusting members (3) are provided, and the plurality of the adjusting members (3) are arranged around the circumference of the telescopic tube (2).

10. A telescopic butterfly valve according to claim 9, characterized in that: The adjusting member (3) comprises a screw (31) and a plurality of nuts (32). The telescopic tube (2) and the butterfly valve body (1) are both provided with through holes for the screw (31) to pass through. The screw (31) passes through the through holes on the telescopic tube (2) and the butterfly valve body (1) and is fixed by the nuts (32).

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