A bellows shut-off valve

Abstract

A corrugated pipe stop valve comprises a valve body, a valve rod, a valve plate arranged at the bottom of the valve rod, a buffer component arranged on the valve rod, the buffer component comprising an upper corrugated pipe and a lower corrugated pipe, the upper corrugated pipe and the lower corrugated pipe being in a plug-in connection, an elastic ring being arranged in the gap between the upper corrugated pipe and the lower corrugated pipe, the elastic ring comprising a first support part arranged in an outward protruding manner, a second support part being arranged below the first support part, and a support groove being arranged on the upper corrugated pipe and being in a fitting arrangement with the first support part. Through the technical scheme, the plug-in connection structure is adopted between the upper corrugated pipe and the lower corrugated pipe, and the elastic ring is arranged in the gap, so that the corrugated pipe has an elastic buffer space when being stressed, and the problem that the middle part of the corrugated pipe is easily deformed and damaged due to stress concentration in the traditional structure is avoided.

Description

Technical Field

[0001] This utility model relates to a bellows gate valve, belonging to the field of valves. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to ensure a leak-proof seal. The sealing surface is either flat or conical, and the valve disc moves linearly along the centerline of the valve seat. The valve stem can also move in a rising and rotating manner. It can be used to control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. Therefore, this type of gate valve is ideal for shut-off, regulation, and throttling applications.

[0003] However, existing gate valves are prone to vibration during the up-and-down movement of the valve stem, resulting in unstable sealing performance. Therefore, a bellows is installed on the outside of the valve stem to buffer the impact force of the valve stem movement. However, the disadvantage of this structure is that the inelastic part in the middle of the bellows is prone to deformation under stress, which can lead to damage to the bellows. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a bellows shut-off valve.

[0005] A bellows gate valve includes a valve body, a valve stem, and a valve plate disposed at the bottom of the valve stem. A buffer component is disposed on the valve stem sleeve. The buffer component includes an upper bellows and a lower bellows, which are connected by an insertion joint. An elastic ring is disposed in the gap between them. The elastic ring includes a first support portion that protrudes outward. A second support portion is disposed below the first support portion. A support groove is disposed on the upper bellows that fits into the first support portion.

[0006] This technical solution employs a plug-in connection structure between the upper and lower bellows, with an elastic ring placed in the gap. This provides the bellows with elastic buffer space under stress, avoiding the problem of concentrated stress and easy deformation and damage in the middle of the bellows in traditional structures. This significantly improves the service life and reliability of the bellows. The impact force generated during the valve stem's up-and-down movement is absorbed and dispersed by the bellows and elastic ring, effectively preventing vibration during valve stem movement and preventing damage to the sealing surface or incomplete sealing due to impact, thus improving the sealing stability of the gate valve.

[0007] Preferably, the first support portion has a protruding surface, which is set at an acute angle to the horizontal line, and the support groove is fitted into the outer wall of the first support portion and the second support portion.

[0008] With this technical solution, the protruding surface on the first support is set at an acute angle to the horizontal line, so that the support can form a certain wedge-shaped contact structure when subjected to axial pressure, which increases the friction and tightness between the support surface and the support groove, thereby effectively preventing the support from slipping or loosening when under pressure, and ensuring the stability of the structural connection.

[0009] Furthermore, the top of the first support portion is provided with a lip-shaped portion, which abuts against the outer wall of the lower corrugated pipe to generate deformation, thereby forming a sealed connection between the upper and lower corrugated pipes.

[0010] This technical solution involves the lip section abutting against the outer wall of the lower bellows and undergoing localized deformation, forming a direct-contact sealing surface at the joint of the two bellows sections, thus creating a reliable mechanical seal. The sealing contact of the lip section prevents fluid or external particles from entering the internal space along the joint surface, reducing the risk of corrosion, contamination, or damage to the elastic ring, thereby improving overall reliability and service life.

[0011] Preferably, the lower corrugated pipe is provided with a limiting groove, and the second support is provided with a limiting part for engaging with the limiting groove, wherein the limiting part cooperates with the first support to form a bidirectional limiting.

[0012] This technical solution involves setting a limiting groove on the lower bellows and a limiting part that engages with it on the second support part. Combined with the structure of the first support part, the elastic ring is constrained in both the upper and lower directions, which can effectively prevent the elastic ring from axially displacing or coming off when the valve stem moves or the fluid impacts, thus ensuring the stability and reliability of the structure.

[0013] Furthermore, two limiting grooves are provided, spaced apart on the outer wall of the lower corrugated pipe.

[0014] This technical solution establishes a stable positioning reference between the two limiting grooves, which facilitates rapid and accurate positioning during assembly, reduces the risk of rotation or misalignment caused by a single limiting surface, and improves assembly consistency.

[0015] Furthermore, the first support portion is provided with a slot, and the second support portion is provided with a locking block that engages with the slot.

[0016] This technical solution restricts the relative movement between the support parts by the engagement of the slot and the block. Whether during the valve stem lifting or the bellows deformation, it ensures that the upper and lower bellows and the elastic ring maintain the correct fit position, avoiding leakage or wear caused by misalignment of the sealing structure.

[0017] Preferably, a limiting ring is provided below the limiting groove, and the limiting ring is used to abut against the upper corrugated pipe to form a limiting connection.

[0018] This technical solution, by setting a limiting ring below the limiting groove, ensures that the upper bellows is subject to double constraints from both the limiting groove and the limiting ring during axial movement. This effectively prevents the bellows from excessive displacement or detachment due to excessive valve stem stroke or fluid impact, thereby improving the safety and stability of the structure.

[0019] The beneficial effects of this utility model are as follows: The upper and lower bellows are connected by a plug-in structure, with an elastic ring in the gap. This provides the bellows with an elastic buffer space when under stress, avoiding the problem of concentrated stress and easy deformation and damage in the middle of the bellows in traditional structures, thus significantly improving the service life and reliability of the bellows. The impact force generated during the up-and-down movement of the valve stem is absorbed and dispersed by the bellows and the elastic ring, effectively preventing vibration during valve stem movement and preventing damage to the sealing surface or incomplete sealing due to impact, thereby improving the sealing stability of the gate valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A magnified view showing the details at point A in the middle; Figure 3 This is a schematic diagram of the structure of an elastic ring; In the diagram, 1 is the valve body; 2 is the valve stem; 3 is the valve plate; 4 is the upper bellows; 41 is the support groove; 5 is the lower bellows; 51 is the limiting groove; 52 is the limiting ring; 6 is the elastic ring; 61 is the first support part; 611 is the protruding surface; 612 is the lip part; 613 is the slot; 62 is the second support part; 621 is the limiting part; and 622 is the locking block. Detailed Implementation

[0022] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0023] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0024] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0025] like Figure 1-3 The diagram shows an embodiment of a bellows gate valve according to the present invention, comprising a valve body 1, a valve stem 2, and a valve plate 3 disposed at the bottom of the valve stem 2. A buffer component is provided on the valve stem 2. The buffer component includes an upper bellows 4 and a lower bellows 5, which are connected by an insertion joint. An elastic ring 6 is provided in the gap between them. The elastic ring 6 includes a first support portion 61 that protrudes outward. A second support portion 62 is provided below the first support portion 61. A support groove 41 is provided on the upper bellows 4 that fits into the first support portion 61.

[0026] This technical solution employs a plug-in connection structure between the upper bellows 4 and the lower bellows 5, with an elastic ring 6 placed in the gap. This provides the bellows with an elastic buffer space when under stress, avoiding the problem of concentrated stress and easy deformation and damage in the middle of the bellows in traditional structures. This significantly improves the service life and reliability of the bellows. The impact force generated by the valve stem 2 during its up-and-down movement is absorbed and dispersed by the bellows and the elastic ring 6, effectively preventing vibration during valve stem 2 movement and preventing damage to the sealing surface or incomplete sealing due to impact, thus improving the sealing stability of the gate valve.

[0027] Preferably, the first support portion 61 is provided with a protruding surface 611, the protruding surface 611 is set at an acute angle to the horizontal line, and the support groove 41 is fitted into the outer wall of the first support portion 61 and the second support portion 62.

[0028] With this technical solution, the protruding surface 611 on the first support part 61 is set at an acute angle to the horizontal line, so that the support part can form a certain wedge-shaped contact structure when subjected to axial pressure, which increases the friction and fitting tightness between the support surface and the support groove 41, thereby effectively preventing the support part from slipping or loosening when under pressure, and ensuring the stability of the structural connection.

[0029] Furthermore, the top of the first support 61 is provided with a lip-shaped part 612, which abuts against the outer wall of the lower corrugated pipe 5 to generate deformation, thereby forming a sealed connection between the upper corrugated pipe 4 and the lower corrugated pipe 5.

[0030] Through this technical solution, the lip portion 612 abuts against the outer wall of the lower bellows 5 and undergoes local deformation, forming a direct contact sealing surface at the joint of the two bellows sections, thus creating a reliable mechanical seal. The sealing contact of the lip portion 612 can prevent fluid or external particles from entering the internal space along the joint surface, reducing the risk of corrosion, contamination, or damage to the elastic ring 6, and improving overall reliability and service life.

[0031] Preferably, the lower corrugated pipe 5 is provided with a limiting groove 51, and the second support part 62 is provided with a limiting part 621 for engaging with the limiting groove 51. The limiting part 621 and the first support part 61 cooperate to form a bidirectional limiting.

[0032] This technical solution involves setting a limiting groove 51 on the lower bellows 5 and setting a limiting part 621 that engages with it on the second support part 62. Combined with the structure of the first support part 61, the elastic ring 6 is constrained in both the upper and lower directions, which can effectively prevent the elastic ring 6 from axially displacing or coming off when the valve stem 2 moves or when the fluid impacts, thus ensuring the stability and reliability of the structure.

[0033] Furthermore, two limiting grooves 51 are provided, spaced apart on the outer wall of the lower corrugated pipe 5.

[0034] Through this technical solution, the two limiting grooves 51 form a stable positioning reference, which is conducive to achieving rapid and accurate positioning during the assembly process, reducing the risk of rotation or misalignment caused by a single limiting surface, and improving assembly consistency.

[0035] Furthermore, the first support portion 61 is provided with a slot 613, and the second support portion 62 is provided with a block 622 that engages with the slot 613.

[0036] Through this technical solution, the engagement of the slot 613 and the block 622 restricts the relative movement between the support parts. Whether during the lifting and lowering of the valve stem 2 or when the bellows is deformed by force, it can ensure that the upper and lower bellows 5 and the elastic ring 6 maintain the correct matching position, avoiding leakage or wear caused by misalignment of the sealing structure.

[0037] Preferably, a limiting ring 52 is provided below the limiting groove 51, and the limiting ring 52 is used to abut against the upper corrugated pipe 4 to form a limiting connection.

[0038] This technical solution, by setting a limiting ring 52 below the limiting groove 51, ensures that the upper bellows 4 is subject to double constraints from the limiting groove 51 and the limiting ring 52 during axial movement. This effectively prevents the bellows from excessive displacement or detachment due to excessive stroke of the valve stem 2 or fluid impact, thereby improving the safety and stability of the structure.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

[0040] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A bellows-type shut-off valve, characterized in that: The valve includes a valve body, a valve stem, and a valve plate located at the bottom of the valve stem. A buffer component is provided on the outer sleeve of the valve stem. The buffer component includes an upper bellows and a lower bellows, which are connected by an insertion joint. An elastic ring is provided in the gap between them. The elastic ring includes a first support portion that protrudes outward. A second support portion is provided below the first support portion. A support groove is provided on the upper bellows that fits into the first support portion.

2. The bellows shut-off valve as described in claim 1, characterized in that: The first support portion has a protruding surface, which is set at an acute angle to the horizontal line, and the support groove is fitted into the outer wall of the first support portion and the second support portion.

3. The bellows shut-off valve as described in claim 2, characterized in that: The top of the first support part is provided with a lip-shaped part, which abuts against the outer wall of the lower corrugated pipe to generate deformation, thereby forming a sealed connection between the upper and lower corrugated pipes.

4. The bellows shut-off valve as described in claim 1, characterized in that: The lower corrugated pipe is provided with a limiting groove, and the second support part is provided with a limiting part for engaging with the limiting groove. The limiting part and the first support part cooperate to form a bidirectional limiting.

5. The bellows shut-off valve as described in claim 4, characterized in that: Two limiting grooves are provided, spaced apart on the outer wall of the lower corrugated pipe.

6. The bellows shut-off valve as described in claim 4, characterized in that: The first support part is provided with a slot, and the second support part is provided with a block that engages with the slot.

7. The bellows shut-off valve as described in claim 4, characterized in that: A limiting ring is provided below the limiting groove, and the limiting ring is used to abut against the upper corrugated pipe to form a limiting connection.

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