Telescopic structure and valve

Abstract

The utility model relates to a kind of telescopic structure and valve, including telescopic pipe, sealing element;Telescopic pipe part is arranged in telescopic main body, and with telescopic main body swing connection;Sealing element is set between telescopic main body and telescopic pipe;The inner wall of telescopic main body is equipped with limit part, and limit part is below sealing element;The lower end of telescopic pipe is equipped with the limit block compatible with limit part, and limit part and limit block are used to limit telescopic pipe, to prevent sealing element from falling off.The utility model prevents telescopic pipe from telescoping excessively to the part where sealing element is located by the structure stop effect of limit part, to effectively avoid the problem that sealing element falls off or shifts during the frequent activity of telescopic pipe.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a telescopic structure and valve. Background Technology

[0002] The telescopic butterfly valve is a special type of valve that combines fluid shut-off, regulation, and pipeline displacement compensation functions. It is widely used in industrial pipeline systems in petrochemical, water supply and drainage, power, and metallurgical industries. Its core feature is the integration of a telescopic component into the traditional butterfly valve. This allows it to absorb axial and radial displacements caused by thermal expansion and contraction, ground settlement, or equipment vibration through the axial displacement of the telescopic pipe. This prevents cracking and leakage at pipeline connections due to stress concentration, ensuring the safe and stable operation of the pipeline system.

[0003] In related technologies, the two telescopic components of a telescopic butterfly valve may detach from each other, causing the seal to be exposed from its installation position. After repeated telescopic movements, the seal is prone to falling off, directly causing the sealing structure to fail. When the seal falls off, the gap between the housing and the pipe cannot be effectively filled, and the fluid medium will continue to leak along the telescopic gap. Utility Model Content

[0004] In view of the defects in the existing technology, such as the easy detachment of seals, the purpose of this utility model is to provide a telescopic structure and valve that effectively prevents the seals from falling off.

[0005] The technical solution provided by this utility model is: a telescopic structure, comprising:

[0006] Telescopic main body;

[0007] A telescopic tube, wherein the telescopic tube portion passes through the telescopic body and is movably connected to the telescopic body;

[0008] A sealing element is disposed between the telescopic body and the telescopic tube;

[0009] The inner wall of the telescopic body is provided with a limiting part, which is located below the seal; the lower end of the telescopic tube is provided with a limiting block that matches the limiting part. The limiting part and the limiting block are used to limit the telescopic tube to prevent the seal from falling off.

[0010] Furthermore, the limiting part is recessed away from the telescopic tube, and the limiting part includes an upper groove wall; one end of the limiting block protrudes from the outer wall of the telescopic tube, and the limiting block is located inside the limiting part;

[0011] When the telescopic tube moves to the upper end of the limiting part and abuts against the upper groove wall, the telescopic tube is limited to prevent the seal from falling off.

[0012] Furthermore, the limiting part also includes a lower groove wall that is symmetrical to the upper groove wall;

[0013] When the telescopic tube moves to the lower end of the limiting part and abuts against the lower groove wall, the telescopic tube is limited to avoid interference between the telescopic tube and the internal main structure of the telescopic body.

[0014] Furthermore, along the concave direction of the groove, the width of the upper groove wall and / or lower groove wall ranges from 2mm to 5mm; along the axial direction of the telescopic body, the limiting part is a strip-shaped groove.

[0015] Furthermore, along the axis of the telescopic body, the vertical distance between the upper groove wall and the bottom end of the seal is L1, and L1 is not less than 1cm.

[0016] Furthermore, the limiting blocks are arranged circumferentially along the side wall of the telescopic pipe, and there are no fewer than two of them; the plane in which the limiting blocks are located is perpendicular to the axis of the telescopic pipe.

[0017] Furthermore, among the plurality of limiting blocks, the line connecting at least two of the limiting blocks is a virtual line, and the virtual line passes through the center of the telescopic tube cross-section.

[0018] Furthermore, when the limiting block moves along the groove, the limiting block and the opposite surface of the groove remain in a non-contact state.

[0019] Furthermore, the seal is located on the inner top of the telescopic body, and the seal is also interference-fitted with the outer wall of the telescopic tube and the inner wall of the telescopic body.

[0020] Furthermore, the seal has a square cross-section.

[0021] A valve includes the aforementioned telescopic structure and a valve body, wherein the telescopic tube is disposed on the valve body, and the valve body is configured as a butterfly valve body or a gate valve body.

[0022] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0023] This invention effectively limits the extension and retraction of the telescopic tube by using a limiting part. The structural stop prevents the telescopic tube from excessively extending or retracting to the location of the seal, thus effectively avoiding the seal from falling off or shifting during long-term valve service or frequent telescopic tube movement. This design not only continuously ensures the integrity of the sealing structure and reduces the risk of media leakage due to seal failure, but also reduces the frequency of seal replacement and extends the overall service life of the valve. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the telescopic structure in one embodiment of this application;

[0025] Figure 2 As one embodiment of this application Figure 1 A magnified view of part A;

[0026] Figure 3 This is a schematic diagram showing the positions of the upper and lower tank walls in one embodiment of this application.

[0027] Explanation of the labels in the diagram:

[0028] Telescopic main body 1; limiting part 11, upper groove wall 111, lower groove wall 112;

[0029] 2. Telescopic tube; 21. Limiting block;

[0030] Seal 3;

[0031] 4. Telescopic pressure ring. Detailed Implementation

[0032] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0033] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0034] Example 1

[0035] This embodiment discloses a telescopic structure, the core of which includes three main parts: a telescopic body 1, a telescopic assembly, and a sealing element 3. These components work together to achieve displacement compensation. The telescopic assembly is centered on a telescopic pipe 2, which partially passes inside the telescopic body 1 and is movably connected to the telescopic body 1 via axial sliding. This allows the telescopic pipe 2 to extend or retract relative to the telescopic body 1 within a certain range, thereby adapting to displacement changes in the pipeline system.

[0036] To ensure the valve's sealing performance, the sealing element 3 is installed in the gap between the telescopic body 1 and the telescopic pipe 2, specifically located at the top inner side of the telescopic body 1. It forms an effective seal through an interference fit with both, preventing fluid leakage along the telescopic gap.

[0037] Specifically, a specially designed limiting part 11 is provided on the inner wall of the telescopic body 1, directly below the seal 3. This limiting part 11, on the one hand, precisely guides the axial telescopic movement of the telescopic tube 2 by cooperating with the outer wall of the telescopic tube 2, strictly limiting its movement trajectory and ensuring smooth and stable telescopic action; on the other hand, the limiting part 11 also effectively limits the telescopic stroke of the telescopic tube 2, preventing the telescopic tube 2 from excessively extending upwards to the seal 3 through structural stops, effectively preventing the seal 3 from falling off or shifting during long-term use of the valve or frequent movement of the telescopic tube 2.

[0038] More specifically, in order to achieve precise control of the telescopic travel of the telescopic tube 2, the limiting part 11 adopts a groove structure that is recessed to the side away from the telescopic tube 2. Along the axial direction of the telescopic body 1, the limiting part 11 is constructed as a strip-shaped groove.

[0039] The groove includes an upper groove wall 111. Correspondingly, a limiting block 21 is provided at the lower end of the telescopic tube 2. One end of the limiting block 21 protrudes radially from the outer wall of the telescopic tube 2 and is located in the groove, forming a travel limiting engagement mechanism of "groove-limiting block".

[0040] When the telescopic tube 2 extends upward, the limiting block 21 moves upward synchronously until the upper end of the limiting block 21 abuts against the upper groove wall 111. At this time, the upward movement of the telescopic tube 2 is strictly limited, which can effectively prevent it from moving excessively upward to the sealing part 3 and causing squeezing damage, thereby preventing the sealing part 3 from falling off.

[0041] In addition, the groove is also provided with a lower groove wall 112 that is symmetrical to the upper groove wall 111. When the telescopic tube 2 extends downward to its maximum stroke, the lower end of the limiting block 21 will abut against the lower groove wall 112 to limit the downward movement of the telescopic tube 2 and prevent it from interfering or colliding with the internal main structure of the telescopic body 1 due to excessive downward movement.

[0042] Along the recessed direction of the groove, the width of the upper groove wall 111 and / or the lower groove wall 112 is set to 2mm to 5mm. This width range is designed differently according to the shell thickness of the butterfly valve body, which can ensure that the groove wall has sufficient structural support strength and can effectively resist the limiting block 21.

[0043] Along the axial direction of the upper housing 1, the vertical distance between the upper groove wall 111 and the bottom end of the seal 3 is L1, and L1 is not less than 1cm. This distance provides sufficient protective space for the seal 3.

[0044] The sealing element 3 is located on the top of the inner wall of the telescopic body 1 and is sleeved on the outer circumferential wall of the telescopic tube 2. The sealing element 3 is also interference-fitted with the outer wall of the telescopic tube 2 and the inner wall of the housing 1. This forms a circumferential limit on the sealing element 3, providing a stable installation base for the sealing element 3 and ensuring the overall stability of the sealing structure.

[0045] The telescopic structure also includes a telescopic pressure ring 4, which is positioned above the telescopic body 1 and is fitted onto the circumferential outer wall of the telescopic tube 2 in a sleeve-like manner. The telescopic pressure ring 4 has a dual key function.

[0046] Firstly, it can form a stable clamping force on the seal 3. Through continuous and uniform pressure, it can effectively limit the possible movement or displacement of the seal 3 in the axial direction, ensuring the stability and sealing performance of the sealing structure.

[0047] Secondly, the telescopic pressure ring 4 and the telescopic tube 2 adopt an interference fit design. This fit ensures the tightness of the connection between the two and avoids relative loosening.

[0048] The square cross-section of the seal 3 increases its contact area with the telescopic body 1 and the telescopic tube 2. The interference fit design allows the seal 3 to undergo moderate elastic deformation, fully filling the mating gap and significantly improving the tightness of the seal, effectively preventing media leakage. Simultaneously, this structural combination enhances the seal 3's resistance to compression, preventing displacement or deformation under pressure, further strengthening the reliability of the seal.

[0049] Furthermore, the square seal 3 has unique structural advantages, effectively reducing the risk of detachment. Its square cross-section forms a multi-directional fitting and limiting relationship with the inner wall of the telescopic body 1 and the telescopic tube 2. Compared with other cross-sectional shapes such as circles, the square structure has a larger contact area with the mating surface, further improving the stability and reliability of the sealing structure.

[0050] The limiting blocks 21 are evenly distributed circumferentially along the side wall of the telescopic pipe 2, and the number of them is set to no less than two to ensure force balance. All the limiting blocks 211 are installed in the same plane, and this plane is strictly perpendicular to the axis of the telescopic pipe 2, thereby ensuring the stability of the limiting effect.

[0051] When two limit blocks 21 are set, the center line connecting the two passes through the center of the cross-section of the telescopic tube 2, forming a symmetrical distribution structure, which avoids the telescopic tube 2 from tilting during movement due to unilateral force.

[0052] During the movement of the limiting block 21 along the groove, it always remains in a non-contact state with the relative surface of the groove. This design not only limits the axial displacement of the telescopic tube 2 through the cooperation between the limiting block 21 and the groove, but also avoids direct friction between the two by reserving a gap, which can effectively reduce component wear.

[0053] Example 2

[0054] This embodiment discloses a valve, which includes the telescopic structure described in Embodiment 1, and a valve body. The telescopic structure is disposed on the valve body and can form an organic whole with the valve body to jointly realize the dual functions of fluid control and pipeline compensation. The valve body can be constructed in two forms: a butterfly valve body or a gate valve body, to adapt to different operating conditions.

[0055] When the valve body is constructed as a butterfly valve body, the butterfly valve body specifically includes a valve body, a butterfly plate, a valve seat, a valve stem, and a drive mechanism.

[0056] The butterfly valve body and the telescopic structure are assembled together to form a telescopic butterfly valve. The telescopic butterfly valve is an improved valve that integrates telescopic function on the basis of traditional butterfly valve. It retains the advantages of butterfly valve such as rapid opening and closing and low flow resistance, and solves the displacement compensation problem in pipeline installation and operation through the telescopic structure. It is an important valve type in the field of industrial fluid control.

[0057] Pipelines are prone to axial displacement during installation or operation due to temperature changes, foundation settlement, and installation errors. This displacement involves stretching or compression along the pipeline's length. Traditional butterfly valves cannot accommodate this displacement, potentially leading to loose connections, leaks, or even structural damage. Telescopic butterfly valves, on the other hand, feature a telescopic structure that allows for free axial expansion and contraction to achieve a compensation effect.

[0058] For example, if there is a slight length deviation during pipeline construction, the expansion joint can be adjusted by expansion and contraction to avoid valve deformation caused by forced installation; when high-temperature fluids (such as steam and hot water) flow through the pipeline, the pipeline will axially elongate or shorten due to thermal expansion and contraction, and the expansion joint can absorb this displacement and protect the sealing of the valve and pipeline connection.

[0059] When the valve body is constructed as a gate valve body, the gate valve body specifically includes a valve body, a valve cover, a gate, and a valve seat.

[0060] The telescopic structure described in Example 1 can also be applied to the gate valve body. The gate valve body and the telescopic structure are assembled together to form a telescopic gate valve. The telescopic gate valve can compensate for the length changes caused by the thermal expansion and contraction of the pipeline, and can also compensate for the on-site pipeline docking error, reducing the risk of leakage caused by forced flange assembly.

[0061] The telescopic body 1 can be integrally formed on the valve body, or the telescopic body 1 can be fixed on the valve body by bolts or other fasteners.

[0062] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A telescopic structure, characterized in that: include, Telescopic main body (1); Telescopic tube (2), wherein part of the telescopic tube (2) passes through the telescopic body (1) and is movably connected to the telescopic body (1); A sealing element (3) is disposed between the telescopic body (1) and the telescopic tube (2); The inner wall of the telescopic body (1) is provided with a limiting part (11); the telescopic tube (2) is provided with a limiting block (21) that is adapted to the limiting part (11). The limiting part (11) and the limiting block (21) are used to limit the telescopic tube (2) to prevent the sealing element (3) from falling off.

2. The telescopic structure according to claim 1, characterized in that: The limiting part (11) is recessed away from the telescopic tube (2), and the limiting part (11) includes an upper groove wall (111); one end of the limiting block (21) protrudes from the outer wall of the telescopic tube (2), and one end of the limiting block (21) is located inside the limiting part (11). When the telescopic tube (2) moves to the upper end of the limiting part (11) and abuts against the upper groove wall (111), the telescopic tube (2) is limited to prevent the seal (3) from falling off.

3. The telescopic structure according to claim 2, characterized in that: The limiting part (11) also includes a lower groove wall (112) that is symmetrical to the upper groove wall (111); When the telescopic tube (2) moves to the lower end of the limiting part (11) and abuts against the lower groove wall (112), the telescopic tube (2) is limited to avoid interference between the telescopic tube (2) and the internal main structure of the telescopic body (1).

4. A telescopic structure according to claim 3, characterized in that: Along the concave direction of the groove, the width of the upper groove wall (111) and / or the lower groove wall (112) ranges from 2mm to 5mm; along the axial direction of the telescopic body (1), the limiting part (11) is constructed as a strip-shaped groove.

5. A telescopic structure according to claim 2, characterized in that: Along the axial direction of the telescopic body (1), the vertical distance between the upper groove wall (111) and the bottom end of the seal (3) is L1, and L1 is not less than 1cm.

6. A telescopic structure according to claim 2, characterized in that: The limiting blocks (21) are arranged circumferentially along the side wall of the telescopic pipe (2), and there are no fewer than two of them; the plane in which several of the limiting blocks (21) are located is perpendicular to the axis of the telescopic pipe (2).

7. A telescopic structure according to claim 6, characterized in that: Among the plurality of limiting blocks (21), the line connecting at least two of the limiting blocks (21) is a virtual line, which passes through the center of the cross section of the telescopic tube (2).

8. A telescopic structure according to claim 4, characterized in that: When the limiting block (21) moves along the groove, the limiting block (21) and the opposite surface of the groove remain in a non-contact state.

9. A telescopic structure according to claim 1, characterized in that: The sealing element (3) is located on the inner top of the telescopic body (1), and the sealing element (3) is also interference-fitted with the outer wall of the telescopic tube (2) and the inner wall of the telescopic body (1).

10. A telescopic structure according to claim 1, characterized in that: The seal (3) has a square cross-section.

11. A valve, characterized in that: The telescopic structure includes any one of claims 1 to 10, and further includes a valve body, wherein the telescopic body is disposed on the valve body, and the valve body is constructed as a butterfly valve body or a gate valve body.

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