Corrugated pipe stop valve

Abstract

The utility model provides a corrugated pipe stop valve which comprises a valve body, a valve cover, a valve rod and a valve element assembly, an installation cavity is formed between the valve cover and the valve body, the valve element assembly is arranged in the installation cavity, and the lower end of the valve rod is connected with the valve element assembly. The valve element assembly comprises a housing, an upper connecting ring, a corrugated pipe, a lower connecting ring and a valve clack. The lower end of the housing is fixed between the valve cover and the valve body in a sealed mode, the upper connecting ring is fixed to the inner side of the upper end of the housing in a welded mode, the valve rod is vertically and movably arranged in the upper connecting ring in a penetrating mode, the corrugated pipe is arranged outside the valve rod in a sleeved mode, and the upper end of the corrugated pipe is inserted into the housing and fixed to the upper connecting ring in a welded mode. The lower connecting ring is arranged on the outer side of the lower portion of the valve rod in a sleeving mode and fixedly welded to the valve rod, the lower end of the corrugated pipe is fixedly welded to the lower connecting ring, the valve clack is fixed to the lower end of the valve rod, an annular boss is arranged on the edge of the upper end of the valve clack and vertically connected to the inner side of the upper end of the valve body in a sliding mode, and the lower end of the corrugated pipe is located on the inner side of the annular boss. The utility model has the advantage of small overall height dimension.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a bellows stop valve. Background Art

[0002] The stop valve is a widely used valve with many structural forms to meet the requirements of different working conditions. The stop valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The valve stem opening stroke of the stop valve is relatively short, and the opening height is generally only 1 / 4 of the valve seat channel diameter. The friction between the sealing surfaces of the stop valve is small, and it has a very reliable cut-off function. Usually, the stop valve has only one sealing surface, so the manufacturing process is better and it is easy to maintain, so the stop valve is very commonly used in industrial systems.

[0003] Bellows sealed stop valve is suitable for pipelines with dangerous media such as steam, flammable, explosive, thermal oil, toxic, molten salt, etc. The bellows seal design can effectively block the medium while retaining the original valve stem packing structure. The double sealing structure ensures zero leakage at the valve stem. Therefore, bellows sealed stop valve is widely used in petroleum, chemical, natural gas, optoelectronics, nuclear power and other industries.

[0004] The common bellows-sealed stop valve is realized by adding a transition section between the valve body and the valve cover or raising the height of the flange in the valve body on the basis of the ordinary stop valve. However, the obvious disadvantage of this design is that the total height and weight of the valve are greatly increased. This type of design cannot meet the requirements of some pipelines that have strict requirements on the valve's appearance size and weight. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a bellows stop valve, which has the advantage of a small overall height dimension to meet the scenario where there are requirements for the dimension of the bellows stop valve.

[0006] The utility model provides a bellows stop valve, comprising a valve body, a valve cover, a valve stem and a valve core assembly, wherein the valve cover is fixed to the upper end of the valve body, an installation cavity is formed between the valve cover and the valve body, the valve core assembly is arranged in the installation cavity, the valve stem is vertically inserted into the valve cover, and the lower end of the valve stem is connected to the valve core assembly; the valve core assembly comprises a cover shell, an upper connecting ring, a bellows, a lower connecting ring and a valve disc; the lower end of the cover shell is sealingly fixed between the valve cover and the valve body, the upper end of the cover shell is inserted into the valve cover and the outer side wall of the cover shell is in contact with the inner side wall of the valve cover, the upper connecting ring is welded and fixed to the inner side of the upper end of the cover shell, and the valve stem The bellows is mounted on the outside of the valve stem, the upper end of the bellows is inserted into the cover shell and is welded and fixed to the upper ring, the lower ring is mounted on the outside of the lower part of the valve stem and is welded and fixed to the valve stem, the lower end of the bellows is welded and fixed to the lower ring, the valve disc is fixed to the lower end of the valve stem, an annular boss is arranged at the edge of the upper end of the valve disc, the annular boss is vertically slidably connected to the inner side of the upper end of the valve body, the outer side wall of the annular boss is in contact with the inner side of the upper end of the valve body, and the lower end of the bellows is located on the inner side of the annular boss.

[0007] After the utility model adopts the above structure, since the valve disc is provided with an annular boss, the annular boss can cooperate with the valve body for vertical guidance, that is, the valve disc adopts an upper guiding structure, so that the middle part of the valve body does not need to bear the guiding requirement for the valve disc, so that an annular space can be dug out in the valve body to form a reasonable flow channel, thereby reducing the opening height of the bellows stop valve, so that the bellows can be shortened to reduce the overall height of the bellows stop valve; in addition, the lower part of the bellows can be accommodated on the inner side of the annular boss, and at the same time, the cover shell is used to accommodate the upper part of the bellows, which can significantly reduce the overall height of the bellows stop valve to meet the scenario where there are requirements for the size of the bellows stop valve.

[0008] In a possible embodiment, an annular convex edge is provided on the outer wall of the lower end of the cover shell, and the annular convex edge is pressed between the valve cover and the valve body, and a sealing ring is embedded between the annular convex edge, the valve cover and the valve body; after adopting this structure, under the action of the annular convex edge, the lower end of the cover shell can be reliably pressed between the valve cover and the valve body and fixed with the valve cover and the valve body, and under the action of the sealing ring, the sealing ring can reliably seal the gap between the annular convex edge, the valve cover and the valve body.

[0009] In a possible embodiment, an annular protrusion is provided on the lower end surface of the inner edge of the upper connecting ring, and the upper end of the bellows is sleeved on the outside of the annular protrusion and welded to the annular protrusion; by adopting this structure, the upper end of the bellows can be reliably welded to the upper connecting ring.

[0010] In a possible embodiment, an annular step is provided on the outer side wall of the upper end of the lower connecting ring, and the lower end of the bellows is inserted into the annular step and welded to the side wall of the annular step; by adopting this structure, the lower end of the bellows can be reliably and conveniently welded to the lower connecting ring.

[0011] In a possible embodiment, the valve core assembly also includes two semi-ring-shaped gland halves, an annular groove is provided on the outer wall of the valve stem below the lower connecting ring, and the two gland halves are symmetrically embedded in the annular groove, with the two ends of one gland half respectively abutting against the two ends of the other gland half, each gland half is fixed to the lower end of the valve stem, and the upper end of the valve disc is sleeved on the outer sides of the two gland halves and threadedly connected to the two gland halves; by adopting this structure, the valve disc can be reliably and conveniently connected to the lower end of the valve stem through the two gland halves.

[0012] In a possible embodiment, a blind hole is provided in the middle of the lower end of each gland half, and a pin hole is provided on the valve stem below the annular groove, and each gland half is fixed to the valve stem by a latch inserted into the corresponding pin hole and the blind hole, and each latch is tightly fitted with the pin hole and the blind hole at the corresponding position; after adopting this structure, under the action of the latch, after the latch is fitted and engaged with the pin hole and the blind hole, each gland half can be conveniently and reliably fixed to the valve stem.

[0013] In a possible embodiment, a plurality of spot welding holes spaced circumferentially are provided on the side wall of the lower end of the annular boss, and each spot welding hole is used for allowing the end of a welding rod to pass through so as to weld the valve flap and the two gland halves and form welding points. By adopting this structure, after the valve flap is welded to the two gland halves through the welding points, the valve flap can be further fixed together with the two gland halves, that is, the valve flap can be further reliably fixed to the lower end of the valve stem.

[0014] In a possible implementation, each spot welding hole is arranged to be inclined downward from the outside to the inside; by adopting this structure, the welding rod can more reliably pass through the spot welding hole and contact the valve flap and the two gland halves, which can facilitate the welding of the valve flap and the two gland halves. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of a partially exploded three-dimensional structure of the utility model;

[0017] Figure 3 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the valve stem and valve core assembly after assembly;

[0019] Figure 5 It is a three-dimensional structural diagram of the valve stem and valve core assembly after assembly;

[0020] Figure 6 for Figure 5 Schematic diagram of the structure after enlarging point A in the middle. DETAILED DESCRIPTION

[0021] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0022] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0023] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figure 1-6As shown, the embodiment of the present application discloses a bellows stop valve, comprising a valve body 1, a valve cover 2, a valve stem 3 and a valve core assembly, the valve cover 2 is fixed to the upper end of the valve body 1, a mounting cavity 4 is formed between the valve cover 2 and the valve body 1, the valve core assembly is arranged in the mounting cavity 4, the valve stem 3 is vertically penetrated in the valve cover 2, and the lower end of the valve stem 3 is connected to the valve core assembly; the valve core assembly comprises a cover shell 5, an upper connecting ring 6, a bellows 7, a lower connecting ring 8 and a valve disc 9; the lower end of the cover shell 5 is sealingly fixed between the valve cover 2 and the valve body 1, the upper end of the cover shell 5 is inserted into the valve cover 2 and the outer side wall of the cover shell 5 is in contact with the inner side wall of the valve cover 2, the upper connecting ring 6 is welded and fixed to the inner side of the upper end of the cover shell 5, and the valve The rod 3 is vertically movably arranged in the upper connecting ring 6 and the outer side wall of the valve stem 3 is in contact with the inner side wall of the upper connecting ring 6. The bellows 7 is sleeved on the outside of the valve stem 3. The upper end of the bellows 7 is inserted into the cover 5 and is welded and fixed to the upper connecting ring 6. The lower connecting ring 8 is sleeved on the outer side of the lower part of the valve stem 3 and is welded and fixed to the valve stem 3. The lower end of the bellows 7 is welded and fixed to the lower connecting ring 8. The valve disc 9 is fixed to the lower end of the valve stem 3. An annular boss 91 is arranged at the edge of the upper end of the valve disc 9. The annular boss 91 is vertically slidably connected to the inner side of the upper end of the valve body 1 and the outer side wall of the annular boss 91 is in contact with the inner side of the upper end of the valve body 1. The lower end of the bellows 7 is located on the inner side of the annular boss 91.

[0026] An annular convex edge 51 is arranged on the outer wall of the lower end of the cover shell 5, and the annular convex edge 51 is pressed between the valve cover 2 and the valve body 1, and a sealing ring 52 is embedded between the annular convex edge 51, the valve cover 2 and the valve body 1; after adopting this structure, under the action of the annular convex edge, the lower end of the cover shell can be reliably pressed between the valve cover and the valve body and fixed with the valve cover and the valve body, and under the action of the sealing ring, the sealing ring can reliably seal the gap between the annular convex edge and the valve cover and the valve body.

[0027] An annular protrusion 61 is provided on the lower end surface of the inner edge of the upper connecting ring 6, and the upper end of the bellows 7 is sleeved on the outer side of the annular protrusion 61 and welded to the annular protrusion 61; by adopting this structure, the upper end of the bellows can be reliably welded to the upper connecting ring.

[0028] An annular step 81 is provided on the outer side wall of the upper end of the lower connecting ring 8, and the lower end of the bellows 7 is inserted into the annular step 81 and welded to the side wall of the annular step 81; by adopting this structure, the lower end of the bellows can be reliably and conveniently welded to the lower connecting ring.

[0029] The valve core assembly also includes two semi-ring-shaped gland halves 10, an annular groove 31 is provided on the outer wall of the valve stem 3 below the lower connecting ring 8, the two gland halves 10 are symmetrically embedded in the annular groove 31, the two ends of one gland halves 10 are respectively abutted against the two ends of the other gland halves 10, each gland half 10 is fixed to the lower end of the valve stem 3, the upper end of the valve disc 9 is sleeved on the outside of the two gland halves 10 and is threadedly connected to the two gland halves 10; by adopting this structure, the valve disc can be reliably and conveniently connected to the lower end of the valve stem through the two gland halves.

[0030] A blind hole 101 is provided in the middle of the lower end of each gland half 10, and a pin hole 32 is provided on the valve stem 3 below the annular groove 31. Each gland half 10 is fixed to the valve stem 3 by a latch 20 inserted into the corresponding pin hole 32 and the blind hole 101, and each latch 20 is tightly matched with the pin hole 32 and the blind hole 101 at the corresponding position. After adopting this structure, under the action of the latch, after the latch is matched and plugged with the pin hole and the blind hole, each gland half can be conveniently and reliably fixed to the valve stem.

[0031] A plurality of spot welding holes 92 are arranged on the side wall at the lower end of the annular boss 91 and are distributed at intervals in the circumferential direction. Each spot welding hole 92 is used for the end of a welding rod to pass through so as to weld the valve flap 9 and the two gland halves 10 and form welding points 30. By adopting this structure, after the valve flap is welded to the two gland halves through the welding points, the valve flap can be further fixed to the two gland halves, that is, the valve flap can be further reliably fixed to the lower end of the valve stem. In addition, in the present utility model, there are four welding points in total, two of which are respectively located at the connection between the two gland halves, and the two welding points are used to weld and fix the valve flap and the connection between the two gland bodies, and the remaining two welding points are respectively located in the middle of the upper edge of one of the gland halves. At the same time, four spot welding holes are also arranged, and the four spot welding holes and the four welding points are arranged correspondingly around the circumferential direction of the annular boss.

[0032] Each spot welding hole 92 is arranged to be inclined downward from the outside to the inside; by adopting this structure, the welding rod can more reliably pass through the spot welding hole and contact the valve disc and the two gland halves, that is, it can facilitate the welding of the valve disc and the two gland halves.

[0033] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A bellows stop valve, comprising a valve body (1), a valve cover (2), a valve stem (3) and a valve core assembly, wherein the valve cover (2) is fixed to the upper end of the valve body (1), a mounting cavity (4) is formed between the valve cover (2) and the valve body (1), the valve core assembly is arranged in the mounting cavity (4), the valve stem (3) is vertically inserted into the valve cover (2), and the lower end of the valve stem (3) is connected to the valve core assembly; characterized in that: The valve core assembly comprises a cover shell (5), an upper connecting ring (6), a bellows (7), a lower connecting ring (8) and a valve flap (9); the lower end of the cover shell (5) is sealed and fixed between the valve cover (2) and the valve body (1); the upper end of the cover shell (5) is inserted into the valve cover (2) and the outer wall of the cover shell (5) is in contact with the inner wall of the valve cover (2); the upper connecting ring (6) is welded and fixed to the inner side of the upper end of the cover shell (5); the valve stem (3) is vertically movably inserted into the upper connecting ring (6) and the outer wall of the valve stem (3) is in contact with the inner wall of the upper connecting ring (6); the bellows (7) is sleeved on the outside of the valve stem (3); the bellows The upper end of the valve stem (7) is inserted into the cover shell (5) and is welded to the upper connecting ring (6), the lower connecting ring (8) is sleeved on the outer side of the lower part of the valve stem (3) and is welded to the valve stem (3), the lower end of the bellows (7) is welded to the lower connecting ring (8), the valve flap (9) is fixed to the lower end of the valve stem (3), and an annular boss (91) is provided at the edge of the upper end of the valve flap (9), the annular boss (91) is vertically slidably connected to the inner side of the upper end of the valve body (1) and the outer side wall of the annular boss (91) is in contact with the inner side of the upper end of the valve body (1), and the lower end of the bellows (7) is located on the inner side of the annular boss (91).

2. The bellows stop valve according to claim 1, characterized in that: An annular convex edge (51) is provided on the outer wall of the lower end of the cover shell (5), and the annular convex edge (51) is pressed between the valve cover (2) and the valve body (1), and a sealing ring (52) is embedded between the annular convex edge (51), the valve cover (2) and the valve body (1).

3. The bellows stop valve according to claim 1, characterized in that: An annular protrusion (61) is provided on the lower end surface of the inner edge of the upper connecting ring (6), and the upper end of the bellows (7) is sleeved on the outer side of the annular protrusion (61) and is fixed to the annular protrusion (61) by welding.

4. The bellows stop valve according to claim 1, characterized in that: An annular step (81) is provided on the outer side wall of the upper end of the lower connecting ring (8), and the lower end of the bellows (7) is inserted into the annular step (81) and fixed to the side wall of the annular step (81) by welding.

5. The bellows stop valve according to any one of claims 1 to 4, characterized in that: The valve core assembly also includes two semi-ring-shaped gland halves (10), an annular groove (31) is provided on the outer wall of the valve stem (3) below the lower connecting ring (8), and the two gland halves (10) are symmetrically embedded in the annular groove (31), with the two ends of one gland half (10) respectively abutting against the two ends of the other gland half (10), each gland half (10) is fixed to the lower end of the valve stem (3), and the upper end of the valve flap (9) is sleeved on the outer side of the two gland halves (10) and is threadedly connected to the two gland halves (10).

6. The bellows stop valve according to claim 5, characterized in that: A blind hole (101) is provided in the middle of the lower end of each gland half (10), and a pin hole (32) is provided on the valve stem (3) below the annular groove (31). Each gland half (10) is fixed to the valve stem (3) by a latch (20) inserted into the corresponding pin hole (32) and the blind hole (101), and each latch (20) is tightly matched with the pin hole (32) and the blind hole (101) at the corresponding position.

7. The bellows stop valve according to claim 5, characterized in that: A plurality of spot welding holes (92) spaced apart in the circumferential direction are arranged on the side wall of the lower end of the annular boss (91), and each of the spot welding holes (92) is used for allowing the end of a welding rod to pass through so as to facilitate welding of the valve flap (9) and the two gland halves (10) and form a welding point (30).

8. The bellows stop valve according to claim 7, characterized in that: Each of the spot welding holes (92) is arranged to be inclined downward from the outside to the inside.

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