Low temperature bellows stop valve

Abstract

This application provides a low-temperature bellows gate valve, comprising: a valve body with a vertical accommodating cavity at its top, a through hole in the bottom wall of the accommodating cavity, a first cavity communicating with the side wall of the accommodating cavity at one end of the valve body, and a second cavity communicating with the through hole at the other end of the valve body; a valve stem with a valve disc at its bottom, a bellows sleeved around the valve stem, the bellows being disposed within the accommodating cavity, an upper sealing ring at the top of the bellows abutting against the wall at the top of the accommodating cavity; a valve cover disposed at the top of the valve body, the top of the valve stem extending through the top of the valve cover and connected to a lifting assembly, packing material at the top of the valve stem, packing material disposed around the valve stem, a pressure plate at the top of the packing material, a vertical rod passing through the pressure plate, a disc spring coaxially sleeved on the outside of the vertical rod, the bottom of the vertical rod connected to the outside of the valve cover, a fixing member connected to the top of the vertical rod, and the disc spring positioned between the fixing member and the pressure plate. The disc spring can physically compensate for deformed packing material through the pressure plate, improving the sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, and is particularly related to a low-temperature bellows gate valve. Background Technology

[0002] The liquid helium temperature range refers to the temperature range of liquid helium in cryogenic applications, typically referring to a refrigeration environment with a temperature of -268.65℃. This is the critical application temperature for liquid helium as a refrigerant. Liquid helium readily absorbs heat and vaporizes in a shut-off valve. After vaporization, liquid helium has strong penetrability and may pass through the bellows seal, causing leakage. Therefore, a cryogenic bellows shut-off valve with reliable sealing is required. Utility Model Content

[0003] To address the aforementioned deficiencies in the prior art, this application provides a cryogenic bellows shut-off valve. After liquid helium vaporizes and passes through the bellows seal, causing the packing to deform, the disc spring can physically compensate for the deformed packing through the pressure plate, thereby improving the sealing effect.

[0004] To achieve the above objectives, the present invention employs the following technology:

[0005] A low-temperature bellows shut-off valve, comprising:

[0006] The valve body has a vertical accommodating cavity at its top, a through hole at the bottom wall of the accommodating cavity, a first cavity at one end of the valve body that communicates with the side wall of the accommodating cavity, and a second cavity at the other end of the valve body that extends to the bottom of the accommodating cavity and communicates with the through hole.

[0007] The valve stem has a valve disc at its bottom and a bellows sleeve around its periphery. The bottom of the bellows is welded to the valve stem. The bellows is located in the accommodating cavity and has an upper sealing ring at its top. The upper sealing ring abuts against the wall at the top of the accommodating cavity.

[0008] The valve cover is located on the top of the valve body. The top of the valve stem extends through the top of the valve cover and is connected to a lifting assembly. When the lifting assembly lowers the valve stem to its maximum extent, the valve disc abuts against the through hole. The top of the valve stem is equipped with packing material, which is located around the valve stem. The top of the packing material is equipped with a pressure plate, and a vertical rod is mounted on the pressure plate. A disc spring is coaxially fitted around the outside of the vertical rod. The bottom of the vertical rod is connected to the outside of the valve cover, and a fixing component is connected to the top of the vertical rod. The disc spring is located between the fixing component and the pressure plate.

[0009] Furthermore, the fastener is a nut, which is threadedly connected to the vertical rod.

[0010] Furthermore, a first boss is provided at the bottom of the valve cover periphery, and a second boss is provided at the top of the outer wall of the accommodating cavity. The first boss and the second boss are connected by bolts, and an annular groove is formed between the first boss and the second boss. The upper sealing ring is located in the annular groove.

[0011] Furthermore, the lifting assembly includes a handwheel and a sleeve. The handwheel is rotatably connected to the top of the sleeve in the same direction. A threaded hole is provided in the middle of the handwheel. A screw is coaxially provided on the top of the valve stem. The screw is threaded into the threaded hole. The sleeve is connected to the periphery of the valve cover through a connecting rod.

[0012] Furthermore, the sleeve is provided with a guide cylinder, and the guide cylinder is provided with multiple vertical key bars. Multiple vertical keyways are opened on the periphery of the valve stem, and the multiple key bars slide in the multiple keyways.

[0013] Furthermore, an indicator rod is coaxially provided on the top of the screw, and two indicator marks are spaced apart along its axial direction on the indicator rod. A retaining ring is coaxially provided on the top of the threaded hole, and the indicator rod is located inside the retaining ring. When the valve rod rises to fully open the valve body, the lower indicator mark rises to above the retaining ring. When the valve rod rises to fully close the valve body, the bottom of the upper indicator mark descends to abut against the top of the retaining ring.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. After liquid helium vaporizes and passes through the bellows seal, causing deformation of the packing at the top of the valve cover, the butterfly spring can physically compensate for the deformed packing through the pressure plate, thereby improving the sealing effect.

[0016] 2. The indicator marks on the indicator rod and the retaining ring work together to effectively help the stop valve operator judge the opening and closing status of the stop valve. Attached Figure Description

[0017] Figure 1 This is a perspective view of the overall structure of an embodiment of this application.

[0018] Figure 2 for Figure 1 Enlarged view of section A in the middle.

[0019] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0020] Figure 4 This is a top view of the guide cylinder in an embodiment of this application.

[0021] Figure 5 This is a cross-sectional view of the guide cylinder in an embodiment of this application.

[0022] Figure 6 This is a perspective view of a portion of the valve stem structure in an embodiment of this application.

[0023] Reference numerals: Valve body-1, receiving cavity-101, first cavity-102, second cavity-103, valve stem-2, valve disc-201, bellows-202, upper sealing ring-2021, valve cover-3, lifting assembly-4, packing-5, pressure plate-501, vertical rod-502, disc spring-503, fixing part-504, first boss-301, second boss-104, annular groove-6, handwheel-7, sleeve-701, threaded hole-702, screw-203, connecting rod-7011, guide cylinder-8, key bar-801, keyway-204, indicator rod-9, indicator mark-901, retaining ring-10. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of the present utility model clearer, the implementation methods of the present utility model will be described in detail below with reference to the accompanying drawings. However, the embodiments described in the present utility model are only some embodiments of the present utility model, and not all embodiments.

[0025] This application provides a cryogenic bellows shut-off valve, such as... Figures 1-6 As shown, it includes valve body 1, valve stem 2, valve cover 3, etc.

[0026] Specifically, the valve body 1 has a vertical accommodating cavity 101 at the top, a through hole at the bottom wall of the accommodating cavity 101, a first cavity 102 at one end of the valve body 1 that communicates with the side wall of the accommodating cavity 101, and a second cavity 103 at the other end of the valve body 1 that extends to the bottom of the accommodating cavity 101 and communicates with the through hole.

[0027] A bellows 202 is fitted around the valve stem 2. The bottom of the bellows 202 is welded to the valve stem 2. The bellows 202 is located inside the accommodating cavity 101. An upper sealing ring 2021 is provided at the top of the bellows 202. The upper sealing ring 2021 abuts against the wall at the top of the accommodating cavity 101. The valve cover 3 is located at the top of the valve body 1. The top of the valve stem 2 extends through the top of the valve cover 3 and is connected to a lifting assembly 4. When the lifting assembly 4 drives the valve stem 2 to descend to its maximum limit, the valve disc 201 abuts against the through hole. The top of the valve stem 2 is provided with packing 5. The packing 5 is located around the valve stem 2. A pressure plate 501 is provided at the top of the packing 5. A vertical rod 502 passes through the pressure plate 501. A disc spring 503 is coaxially fitted outside the vertical rod 502. The bottom of the vertical rod 502 is connected to the outside of the valve cover 3. A fixing member 504 is connected to the top of the vertical rod 502. The disc spring 503 is located between the fixing member 504 and the pressure plate 501.

[0028] In actual use, the valve body 1 is opened by raising the valve stem 2 through the lifting assembly 4, connecting the first cavity 102 and the second cavity 103. Conversely, the valve body 1 is closed by lowering the valve stem 2 and sealing the through-hole in the bottom wall of the accommodating cavity 101 through the valve disc 201, thus isolating the first cavity 102 and the second cavity 103. During the use of the shut-off valve, when liquid helium vaporizes and passes through the bellows 202 seal, causing deformation of the packing 5 at the top of the valve cover 3, the disc spring can physically compensate for the deformed packing 5 through the pressure plate 501, improving the sealing effect.

[0029] For details, please refer to Figure 3 The fixing part 504 is a nut, which is threadedly connected to the vertical rod 502. By turning the nut, the height of the nut can be adjusted, which can adjust the distance between the nut and the pressure plate 501, thereby adjusting the compression degree of the disc spring and adjusting the pressure of the disc spring on the pressure plate 501.

[0030] For details, please refer to Figure 2 The bottom of the valve cover 3 is provided with a first boss 301, and the top of the outer wall of the accommodating cavity 101 is provided with a second boss 104. The first boss 301 and the second boss 104 are connected by bolts to facilitate the disassembly of the valve cover 3. More specifically, an annular groove 6 is formed between the first boss 301 and the second boss 104, and the upper sealing ring 2021 is provided in the annular groove 6 to improve the sealing effect.

[0031] For details, please refer to Figure 3 The lifting assembly 4 includes a handwheel 7 and a sleeve 701. The handwheel 7 is rotatably connected to the top of the sleeve 701 in the same direction. A threaded hole 702 is provided in the middle of the handwheel 7. A screw 203 is coaxially provided on the top of the valve stem 2, and the screw 203 is threaded into the threaded hole 702. The sleeve 701 is connected to the periphery of the valve cover 3 through a connecting rod 7011. When it is necessary to control the lifting of the valve stem 2, the handwheel 7 is rotated. Since the handwheel 7 cannot move up and down, the valve stem 2 can be moved up and down through the threaded connection structure. For more details, please refer to [link to relevant documentation]. Figures 3-6 A guide cylinder 8 is fixedly connected inside the sleeve 701. Multiple vertical keyways 801 are provided inside the guide cylinder 8. Multiple vertical keyways 204 are provided around the valve stem 2, and the multiple keyways 801 slide within the multiple keyways 204. This design allows the valve stem 2 to rotate without causing the bellows 202 assembly to rotate, thus preventing the bellows 202 from twisting and being damaged.

[0032] Preferred options, please refer to Figure 3 , Figure 6A screw 203 has an indicator rod 9 coaxially mounted on its top. Two indicator marks 901 are spaced apart along the axial direction of the indicator rod 9. A retaining ring 10 is coaxially mounted on the top of the threaded hole 702. The indicator rod 9 is located within the retaining ring 10. When the valve stem 2 rises to fully open the valve body 1, the lower indicator mark 901 rises above the retaining ring 10. When the valve stem 2 rises to fully close the valve body 1, the bottom of the upper indicator mark 901 descends to abut the top of the retaining ring 10. This design effectively helps the operator of the shut-off valve determine its opening and closing status. Specifically, the indicator marks 901 are text; the upper indicator mark 901 can be set to multiple "fully closed" markings surrounding the indicator rod 9, and the lower indicator mark 901 can be set to multiple "fully open" markings surrounding the indicator rod 9.

[0033] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A low-temperature bellows shut-off valve, characterized in that, include: The valve body (1) has a vertical accommodating cavity (101) at its top, and a through hole at the bottom wall of the accommodating cavity (101). One end of the valve body (1) has a first cavity (102) that communicates with the side wall of the accommodating cavity (101), and the other end of the valve body (1) has a second cavity (103) that extends to the bottom of the accommodating cavity (101) and communicates with the through hole. The valve stem (2) has a valve disc (201) at its bottom. The valve stem (2) is covered with a bellows (202). The bottom of the bellows (202) is welded to the valve stem (2). The bellows (202) is located in the accommodating cavity (101). The top of the bellows (202) is provided with an upper sealing ring (2021). The upper sealing ring (2021) abuts against the wall at the top of the accommodating cavity (101). A valve cover (3) is located on the top of the valve body (1). The top of the valve stem (2) extends through the top of the valve cover (3) and is connected to a lifting assembly (4). When the lifting assembly (4) drives the valve stem (2) to descend to the maximum extent, the valve disc (201) abuts against the through hole. The top of the valve stem (2) is provided with packing (5). The packing (5) is located around the valve stem (2). The top of the packing (5) is provided with a pressure plate (501). A vertical rod (502) is passed through the pressure plate (501). A disc spring (503) is coaxially sleeved on the outside of the vertical rod (502). The bottom of the vertical rod (502) is connected to the outside of the valve cover (3). A fixing piece (504) is connected to the top of the vertical rod (502). The disc spring (503) is located between the fixing piece (504) and the pressure plate (501).

2. The low-temperature bellows shut-off valve according to claim 1, characterized in that, The fastener (504) is a nut, which is threadedly connected to the vertical rod (502).

3. A low-temperature bellows shut-off valve according to claim 1, characterized in that, The bottom of the valve cover (3) is provided with a first boss (301), and the top of the outer wall of the accommodating cavity (101) is provided with a second boss (104). The first boss (301) and the second boss (104) are connected by bolts, and an annular groove (6) is formed between the first boss (301) and the second boss (104). The upper sealing ring (2021) is located in the annular groove (6).

4. A low-temperature bellows shut-off valve according to claim 1, characterized in that, The lifting assembly (4) includes a handwheel (7) and a sleeve (701). The handwheel (7) is rotatably connected to the top of the sleeve (701) in the same direction. A threaded hole (702) is provided in the middle of the handwheel (7). A screw (203) is coaxially provided on the top of the valve stem (2). The screw (203) is threaded into the threaded hole (702). The sleeve (701) is connected to the circumference of the valve cover (3) through a connecting rod (7011).

5. A low-temperature bellows shut-off valve according to claim 4, characterized in that, The sleeve (701) is provided with a guide cylinder (8), and the guide cylinder (8) is provided with multiple vertical key bars (801). Multiple vertical keyways (204) are opened on the periphery of the valve stem (2), and the multiple key bars (801) slide in the multiple keyways (204).

6. A low-temperature bellows shut-off valve according to claim 4, characterized in that, The top of the screw (203) is coaxially provided with an indicator rod (9), and two indicator marks (901) are provided on the indicator rod (9) at intervals along its axial direction. The top of the threaded hole (702) is coaxially provided with a retaining ring (10), and the indicator rod (9) is located inside the retaining ring (10). When the valve rod (2) rises to fully open the valve body (1), the lower indicator mark (901) rises to above the retaining ring (10). When the valve rod (2) rises to fully close the valve body (1), the bottom of the upper indicator mark (901) falls to abut the top of the retaining ring (10).

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