A bellows filling valve structure

Abstract

The present invention discloses a bellows filling valve structure, including a driving handle, a driving nut, a valve stem, a valve cover and a valve body. The driving handle is connected to the driving nut, and the driving nut is threadedly matched with the valve stem. A first pin hole is provided on the valve cover, and a first limit pin passes through the first pin hole and is inserted on the driving nut to limit the movement of the driving nut in the axial direction of the valve stem. A second pin hole is also provided on the valve cover, and a second limit pin passes through the second pin hole to limit the rotation of the valve stem. The driving mechanism of the present invention is composed of a driving nut, a driving handle and a limit pin. The driving handle drives the driving nut to rotate, and the limit pin limits the up and down movement of the driving nut. The driving nut realizes the up and down movement of the valve stem through the thread. The driving mechanism has a simple structure, few components, is easy to assemble, and has a low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a bellows filling valve structure. Background Art

[0002] Bellows valves generally include driving mechanism, valve body, valve cover, valve stem, valve core, bellows, anti-rotation mechanism and other main components. The existing bellows valve driving mechanism and anti-rotation mechanism have complex structures, many parts, and are difficult to assemble; the bolt and gasket connection sealing structure of the valve body and valve cover is complex, and the sealing reliability is poor; when welding the bellows to the valve stem and valve cover, the bellows is a thin-walled structure, and there is a large thickness difference between the valve stem and valve cover, and the valve structure problem makes welding more inconvenient, resulting in great difficulties in bellows welding; although bellows valves can solve the problem of valve external sealing, their pressure bearing capacity is poor. Summary of the invention

[0003] The purpose of the present invention is to provide a novel bellows filling valve structure to solve the structural and technical problems existing in the existing bellows valves.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The present invention discloses a bellows filling valve structure, comprising a driving handle, a driving nut, a valve stem, a valve cover and a valve body. The driving handle is connected to the driving nut, and the driving nut is threadedly matched with the valve stem. A first pin hole is provided on the valve cover, and a limit pin passes through the first pin hole and is inserted on the driving nut to limit the movement of the driving nut in the axial direction of the valve stem. A second pin hole is also provided on the valve cover, and an anti-rotation pin passes through the second pin hole to limit the rotation of the valve stem.

[0006] As a further technical solution, an anti-rotation groove is formed between the valve stem and the valve cover, and the second limit pin is inserted in the anti-rotation groove.

[0007] As a further technical solution, a bellows is provided outside the valve stem, the upper end of the bellows is welded to an upper ring of the bellows, and the lower end of the bellows is welded to a lower ring of the bellows.

[0008] As a further technical solution, the upper ring of the bellows is welded to the valve stem, the lower ring of the bellows is welded to the valve cover, and the valve cover is welded to the valve body.

[0009] As a further technical solution, the valve stem, valve cover, bellows, bellows lower ring and bellows upper ring form an isochoric deformation cavity, and the isochoric deformation cavity is filled with a filler.

[0010] As a further technical solution, the valve cover and the valve body are matched with each other through a flange and a groove.

[0011] As a further technical solution, the valve stem head is connected to the valve core through a valve core pin.

[0012] As a further technical solution, the drive nut and the drive handle are threadedly connected.

[0013] The beneficial effects of the above embodiments of the present invention are as follows:

[0014] (1) The driving mechanism consists of a driving nut, a driving handle, and a limit pin. The driving handle drives the driving nut to rotate, and the limit pin limits the up and down movement of the driving nut. The driving nut realizes the up and down movement of the valve stem through the thread. This driving mechanism has a simple structure, few components, easy assembly, and low manufacturing cost.

[0015] (2) The valve stem anti-rotation mechanism consists of an anti-rotation pin and an anti-rotation groove on the valve stem. The anti-rotation pin is inserted into the anti-rotation groove of the valve stem to limit the rotation of the valve stem. This anti-rotation mechanism has a simple structure, few components, easy assembly, and low manufacturing cost.

[0016] (3) The connection between the upper ring of the bellows and the bellows and the valve stem is welded, the connection between the lower ring of the bellows and the bellows and the valve cover is welded, and the connection between the valve body and the valve cover is welded, so that the valve forms a continuous sealing body, avoiding the unreliability of the bolt and gasket connection seal, and ensuring the overall external sealing performance of the valve.

[0017] (4) The present invention is different from the existing bellows valve in which the bellows is directly welded to the valve stem and the valve cover. In the present invention, the bellows is first welded to the bellows upper ring and the bellows lower ring, and then the bellows upper ring is welded to the valve stem, and the bellows lower ring is welded to the valve cover. When the bellows is directly welded to the valve stem and the valve seat, the welding is difficult due to the large thickness difference, and it is difficult to ensure the welding quality; in the structure of the present invention, the thickness difference between the bellows and the bellows upper and lower rings is small, which makes it easy to ensure the welding quality, and this structure is easier to operate when welding.

[0018] (5) The present invention comprises a valve stem, a valve cover, a bellows, a bellows lower ring and a bellows upper ring to form an isochoric deformation cavity, and fills the isochoric deformation cavity. This structure can not only improve the pressure resistance of the valve, but also keep the volume of the inner cavity and the volume of the filler unchanged during the up and down movement of the valve stem, thereby providing follow-up support for the bellows at all times, and further improving the pressure bearing capacity of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] In the figure: 1. drive nut; 2. drive handle; 3. limit pin; 4. limit ring groove; 5. anti-rotation pin; 6. anti-rotation groove; 7. bellows upper ring; 8. bellows; 9. bellows lower ring; 10. valve core pin; 11. valve core; 12. valve body; 13. positioning flange; 14. filler; 15. valve cover; 16. valve stem; 17. second pin hole; 18. valve stem thread; 19. first pin hole; 20. drive nut thread. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0024] Glossary: ​​The isochoric deformation chamber in the present embodiment refers to a chamber composed of a valve cover, a bellows, upper and lower rings of the bellows and a valve stem, i.e., a chamber filled with a filler. The volume of this chamber does not change with the changes in the up and down movement of the valve stem and the stretching and compression of the bellows, that is, it is isochoric. Deformation refers to the change in the shape of the filling chamber during the movement of the valve stem.

[0025] "Limit pin" refers to an ordinary cylindrical pin used to achieve the limit function.

[0026] "Anti-rotation pin" refers to an ordinary cylindrical pin used to achieve the limit function.

[0027] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0028] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present invention proposes a bellows filling valve structure.

[0029] In a typical embodiment of the present invention, Figure 1As shown, the bellows filling valve structure disclosed in this embodiment includes a valve body 12, a valve cover 15, a valve stem 16, a valve core 11, a valve core pin 10, a drive nut 1, a drive handle 2, a limit pin 3, an anti-rotation pin 5, a bellows 8, a bellows upper ring 7, a bellows lower ring 9, a filler 14, etc.;

[0030] The valve cover 15 is fixed to the valve body 12, the head of the valve stem 16 is inserted into the valve body 12 and connected to the valve core 11, the tail of the valve stem 16 passes through the valve cover 15 and is connected to the drive nut 1, and the drive nut 1 is connected to the drive handle 2;

[0031] Further, such as Figure 1 As shown, the driving handle 2 is arranged horizontally, passes through the driving nut 1, and is threadedly matched with the driving nut 1; the driving nut 1 is a cylindrical member, and a threaded hole is arranged in the cylindrical member, and the threaded hole is matched with the tail thread of the valve stem 16, and a limiting ring groove 4 is arranged on the outer circle of the driving nut 1;

[0032] At least one second pin hole 19 is provided on the valve cover 15. Preferably, the axial direction of the second pin hole 19 is perpendicular to the axial direction of the drive nut 1. A limit pin 3 is inserted in the second pin hole 19, and the limit pin 3 passes through the second pin hole 19 and is directly inserted into the limit ring groove 4 of the outer ring of the drive nut 1 to limit the movement of the drive nut in the axial direction of the valve stem.

[0033] At least one first pin hole 17 is also provided on the valve cover 15. Preferably, the axial direction of the first pin hole 17 is perpendicular to the axial direction of the drive nut 1. An anti-rotation pin 5 is inserted in the first pin hole 17, and the anti-rotation pin 5 passes through the first pin hole 17 and is directly inserted into the anti-rotation groove 6 formed by the valve stem 16 and the valve cover 15 to limit the rotation of the valve stem; and the first pin hole 17 is located below the second pin hole 19, and the first pin hole 17 is arranged near the middle of the valve cover 15.

[0034] A bellows 8 is also mounted on the valve stem 16. The bellows 8 is close to the bottom of the valve cover 15. The bottom of the bellows 8 is welded to a bellows lower ring 9, the top of the bellows 8 is welded to a bellows upper ring 7, the bellows upper ring 7 is welded to the valve stem 16, and the bellows lower ring 9 is welded to the valve cover 15. The valve cover 15 is welded to the valve body 12. Through the welding between the various components, the valve forms a continuous sealing body, avoiding the unreliability of the bolt and gasket connection seal, and ensuring the overall external sealing performance of the valve.

[0035] The present invention is different from the existing bellows valve in which the bellows is directly welded to the valve stem and the valve cover. In the present invention, the bellows 8 is first welded to the bellows upper ring 7 and the bellows lower ring 9, and then the bellows upper ring 7 is welded to the valve stem 16, and the bellows lower ring 9 is welded to the valve cover 15. When the bellows is directly welded to the valve stem and the valve seat, the welding is difficult due to the large thickness difference, and it is difficult to ensure the welding quality; in the structure of the present invention, the thickness difference between the bellows and the upper and lower rings of the bellows is small, it is easy to ensure the welding quality, and this structure is easier to operate when welding.

[0036] Furthermore, the valve body 12 and the valve cover 15 in this embodiment are connected by a positioning flange 13 formed by a groove of the valve body 12 and a flange of the valve cover 15, thereby ensuring the coaxiality of the valve cover and the valve body and preventing deformation during welding.

[0037] Furthermore, the valve stem 16 and the valve core 11 in this embodiment are connected by means of a valve core pin 10 to achieve connection between the two.

[0038] Furthermore, in the present embodiment, the valve stem 16, the valve cover 15, the bellows 8, the bellows upper ring 7 and the bellows lower ring 9 form an isochoric deformation cavity, and the filler 14 is filled in the isochoric deformation cavity formed by the valve stem 16, the valve cover 15, the bellows 8, the bellows upper ring 7 and the bellows lower ring 9; this structure can not only improve the pressure resistance of the valve, but also the volume of the inner cavity and the volume of the filler remain unchanged during the up and down movement of the valve stem, thereby providing follow-up support for the bellows at all times, further improving the pressure bearing capacity of the valve.

[0039] Preferably, the filler 14 in this embodiment can be selected from gas, liquid, solid powder and a mixture thereof. The solid particles can be molybdenum disulfide, graphite powder, small steel balls and the like.

[0040] The working principle of the present invention is as follows:

[0041] When the valve is working, the driving handle 2 drives the driving nut 1 to rotate, and the driving nut 1 will not move up and down under the action of the limit pin 3 and the limit ring groove 4; the rotation of the driving nut 1 is transmitted to the valve stem 16 through the driving nut thread 20 and the valve stem thread 18, and at the same time the anti-rotation pin 5 and the anti-rotation groove 6 limit the rotation of the valve stem 16, so at this time the valve stem 16 moves up and down, and the up and down movement of the valve stem 16 drives the up and down movement of the valve core 11 to realize the opening and closing of the valve.

[0042] Finally, it should be noted that relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bellows filling valve structure, characterized in that: It includes a driving handle, a driving nut, a valve stem, a valve cover and a valve body. The driving handle is connected to the driving nut, the driving nut is threadedly matched with the valve stem, a first pin hole is provided on the valve cover, a limit pin passes through the first pin hole and is inserted on the driving nut to limit the movement of the driving nut in the axial direction of the valve stem, and a second pin hole is also provided on the valve cover, an anti-rotation pin passes through the second pin hole to limit the rotation of the valve stem; The valve stem is provided with a bellows outside, the upper end of the bellows is welded to the upper ring of the bellows, and the lower end of the bellows is welded to the lower ring of the bellows; The bellows upper ring is welded to the valve stem, the bellows lower ring is welded to the valve cover, and the valve cover is welded to the valve body; The valve stem, valve cover, bellows, bellows lower ring, and bellows upper ring form an isochoric deformation cavity, and the isochoric deformation cavity is filled with a filler; The valve cover and the valve body are matched with each other through the flange and the groove; The bellows is first welded to the bellows upper ring and bellows lower ring, then the bellows upper ring is welded to the valve stem, and the bellows lower ring is welded to the valve cover; The valve stem, valve cover, bellows, bellows lower ring and bellows upper ring form an isochoric deformation cavity, and filling is carried out in the isochoric deformation cavity, which improves the pressure resistance of the valve. In addition, the volume of the inner cavity and the volume of the filler remain unchanged during the up and down movement of the valve stem, providing follow-up support for the bellows at all times.

2. The bellows filling valve structure according to claim 1, characterized in that: An anti-rotation groove is formed between the valve stem and the valve cover, and an anti-rotation pin is inserted in the anti-rotation groove.

3. The bellows filling valve structure according to claim 1, characterized in that: The valve stem head is connected to the valve core through a valve core pin.

4. The bellows filling valve structure according to claim 1, characterized in that: The driving nut is threadedly connected with the driving handle.

5. The bellows filling valve structure according to claim 1, characterized in that: The second pin hole is arranged at a position close to the center of the valve cover.

6. The bellows filling valve structure according to claim 1, characterized in that: Two first pin holes are provided and are arranged opposite to each other along the radial direction of the valve cover; two second pin holes are provided and are arranged opposite to each other along the radial direction of the valve cover.

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