Ultralow temperature stop valve

Abstract

The application relates to the technical field of stop valves, and discloses an ultralow-temperature stop valve, which comprises a valve seat and a valve body, the valve seat is arranged on the valve body, a valve rod for opening and closing the valve seat is arranged in the valve body, a packing part is arranged on the valve body, the packing part is used for plugging a gap between the valve body and the valve rod, a heat preservation sleeve is arranged on the valve body, a baffle is arranged on the valve body, the heat preservation sleeve is located on the side, away from the valve seat, of the baffle, and the heat preservation sleeve is located on the outside of the packing part. The heat preservation sleeve is arranged on the valve body, the heat preservation sleeve is located on the side, away from the valve seat, of the baffle, the baffle limits the movement of the heat preservation sleeve, the heat preservation sleeve can stably preserve the temperature of the packing part, the packing part is not prone to thermal bridge effect, and the condition that the packing part can quickly adsorb cold air is reduced.

Description

Technical Field

[0001] This application relates to the technical field of shut-off valves, and in particular to a cryogenic shut-off valve. Background Technology

[0002] Cryogenic shut-off valves are forced-seal valves specifically designed for extremely low temperature conditions (typically ≤ -100℃). Their core function is to achieve reliable shut-off, regulation, or throttling control of fluids in cryogenic media transportation systems such as liquefied natural gas (LNG), liquid nitrogen, and liquid oxygen.

[0003] In related technologies, a gate valve includes a valve body and a valve seat. The valve body is bolted to the valve seat, and a valve stem is slidably mounted on the valve body. The valve stem is used to open and close the gate valve, and a packing part is provided on the valve stem to seal the gap between the valve stem and the valve body.

[0004] Since gate valves are used to transport cryogenic fluids, the internal temperature of the valve body is low during transportation. As a result, moisture in the environment can easily condense into ice, affecting the movement of the valve stem. This can obstruct the opening and closing of the gate valve and affect its normal use. Summary of the Invention

[0005] To address the issue of moisture condensing into ice in the environment affecting valve stem movement, this application provides an ultra-low temperature shut-off valve.

[0006] This application provides a cryogenic shut-off valve, which adopts the following technical solution:

[0007] A cryogenic shut-off valve includes a valve seat and a valve body. The valve seat is disposed on the valve body. The valve body is provided with a valve stem for opening and closing the valve seat. The valve body is provided with a packing portion for sealing the gap between the valve body and the valve stem. The valve body is fitted with an insulation sleeve. The valve body is provided with a baffle. The insulation sleeve is located on the side of the baffle away from the valve seat and is located outside the packing portion.

[0008] By adopting the above technical solution, an insulation sleeve is fitted onto the valve body, positioned on the side of the baffle away from the valve seat. This baffle restricts the movement of the insulation sleeve, allowing it to stably insulate the packing section and reduce the likelihood of thermal bridging, thus minimizing the packing section's ability to quickly absorb cold air. Furthermore, the insulation sleeve prevents moisture from condensing on the valve body's outer surface. Since ice has a much higher thermal conductivity than air, the temperature of the metal where ice adheres will be lower than other parts, potentially damaging the packing section. Reducing ice on the valve body's outer surface mitigates the impact on the packing section. Simultaneously, the baffle, located on the side of the insulation sleeve closer to the valve seat, increases the distance heat travels, allowing cold air to absorb some heat when it reaches the insulation sleeve.

[0009] Optionally, the baffle is provided with a fixing spring, and the insulation sleeve is provided with a fixing groove for inserting the fixing spring.

[0010] By adopting the above technical solution, the fixing spring is inserted into the fixing groove to fix the insulation sleeve, reducing the possibility of the insulation sleeve moving on the baffle, so that the insulation sleeve can stably insulate the packing in the valve body.

[0011] Optionally, the insulation sleeve has a through hole with a connecting fixing groove, a limit strip is slidably connected in the through hole, and an annular groove for the limit strip to be inserted is provided on the valve body; when the fixing spring is inserted into the through hole, the limit strip is inserted into the annular groove.

[0012] By adopting the above technical solution, the fixing spring is inserted into the perforation, and the fixing spring moves the limiting strip so that the limiting strip is inserted into the annular groove, so that the insulation sleeve and the valve body can be relatively fixed, reducing the possibility of the insulation sleeve tilting and the possibility of the insulation sleeve rotating on the valve body, so that the insulation sleeve can stably perform insulation treatment on the valve body.

[0013] Optionally, the insulation sleeve is provided with a water-absorbing block, which is placed on the limiting strip and is used to absorb moisture. The water-absorbing block is located between the insulation sleeve and the valve body.

[0014] By adopting the above technical solution, the water-absorbing block is placed on the limiting strip, allowing the water-absorbing block to absorb moisture. The water-absorbing block is located between the insulation sleeve and the valve body, so that the water-absorbing block can absorb the moisture between the insulation sleeve and the valve body, thereby preventing the insulation sleeve and the valve body from freezing due to low temperature and reducing the possibility of ice or water vapor seeping into the filling part.

[0015] Optionally, an elastic strip is slidably connected to the insulation sleeve. The elastic strip is located on the moving path of the limiting strip and can bend towards the valve body. When the elastic strip protrudes through the hole, it abuts against the valve body.

[0016] By adopting the above technical solution, the elastic strip is located on the moving path of the limiting strip, which enables the elastic strip to drive the limiting strip to move. In addition, the elastic strip can bend towards the valve body, so that the elastic strip can abut against the valve body, reducing the gap between the elastic strip and the valve body. This reduces the amount of air entering between the valve body and the insulation sleeve, making it less likely for ice to condense on the valve body and cause damage to the packing.

[0017] Optionally, the water-absorbing block is located between one end of the elastic strip abutting the valve body and the other end of the limiting strip abutting the valve body.

[0018] By adopting the above technical solution, the water-absorbing block is located between one end of the elastic strip abutting the valve body and the other end of the limiting strip abutting the valve body, so that the water-absorbing block can absorb the moisture in the air in the valve body and the insulation sleeve, thereby reducing the situation where the moisture in the air condenses into ice.

[0019] Optionally, the valve body is equipped with an alarm, and the alarm is equipped with a driving component. The driving component is used to activate the alarm. After the water-absorbing block absorbs water, its volume expands. The driving component is located on the expansion path of the water-absorbing block. When the water-absorbing block absorbs sufficient water, the water-absorbing block abuts against the driving component, and the driving component activates the alarm. When the water-absorbing block does not absorb sufficient water, the water-absorbing block does not abut against the driving component.

[0020] By adopting the above technical solution, when the absorbent block absorbs water and expands, the driving component is located on the moving path of the absorbent block, enabling the absorbent block to drive the driving component to move, thereby activating the alarm and allowing the staff to know that the absorbent block needs to be replaced. This reduces the situation where the absorbent block becomes saturated with water and can no longer absorb water, thus eliminating the need for staff to determine whether the absorbent block inside the insulation sleeve needs to be replaced.

[0021] Optionally, the driving component includes a driving block and a driving spring. The driving spring is disposed on the valve body, and the driving block is disposed on the driving spring. The driving spring drives the driving block to move away from the valve body. The moving path of the driving block intersects with the expansion path of the water-absorbing block. When the water-absorbing block absorbs sufficient water, the water-absorbing block activates the alarm through the driving block.

[0022] By adopting the above technical solution, when the water-absorbing block does not absorb enough water, the drive spring drives the drive block to move, so that the drive block does not touch the alarm and the alarm is not activated; when the water-absorbing block absorbs enough water, the water-absorbing block expands, so that the water-absorbing block can drive the drive block to move, so that the drive block can activate the alarm, so that the staff knows that the water-absorbing block needs to be replaced or the shut-off valve needs to be repaired.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By installing an insulation sleeve on the valve body, positioned on the side of the baffle away from the valve seat, the baffle restricts the movement of the insulation sleeve, ensuring stable insulation of the packing section and preventing it from being affected by excessively low temperatures. Furthermore, the insulation sleeve prevents moisture from condensing on the valve body's outer surface. Since ice has a much higher thermal conductivity than air, the temperature of the metal where ice adheres will be lower than other parts, potentially damaging the packing section. Reducing ice on the valve body's outer surface mitigates this impact. Simultaneously, the baffle, located on the side of the insulation sleeve closer to the valve seat, increases the distance heat travels, allowing cold air to absorb some heat when it reaches the insulation sleeve.

[0025] 2. When the absorbent block absorbs water and expands, the driving component is located on the moving path of the absorbent block, enabling the absorbent block to drive the driving component to move and trigger the alarm. This allows the staff to know that the absorbent block needs to be replaced, reducing the situation where the absorbent block becomes saturated with water and can no longer absorb water. As a result, the staff does not need to judge whether the absorbent block inside the insulation jacket needs to be replaced. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0027] Figure 2 It is along Figure 1 A partial sectional view of line AA in the middle;

[0028] Figure 3 This is an exploded view highlighting the driving component in an embodiment of this application.

[0029] Reference numerals: 1. Valve body; 11. Valve seat; 12. Valve stem; 13. Filler part; 14. Baffle; 15. Annular groove; 2. Insulation sleeve; 21. First insulation block; 22. Second insulation block; 23. Locking block; 231. Locking groove; 24. Connecting piece; 241. Connecting groove; 25. Fixing groove; 251. Fixing spring; 26. Perforation; 261. Limiting strip; 262. Limiting inclined surface; 27. Elastic strip; 271. Elastic block; 272. Elastic inclined surface; 28. Water absorption block; 29. ​​Receiving groove; 291. Driving component; 292. Driving block; 293. Driving spring; 294. Driving arc surface. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This embodiment discloses a cryogenic shut-off valve. (Refer to...) Figure 1 A cryogenic shut-off valve includes a valve seat 11 and a valve body 1, wherein the valve body 1 is bolted to the valve seat 11.

[0032] Reference Figure 1 and Figure 2 A valve stem 12 is slidably disposed inside the valve body 1, and the valve stem 12 is used to open and close the valve seat 11. A filling part 13 is provided inside the valve body 1, and the filling part 13 is used to achieve sealing between the valve stem 12 and the valve body 1.

[0033] Reference Figure 1 and Figure 2 A baffle 14 is fixedly connected to the outer surface of the valve body 1, extending circumferentially along the valve body 1. A heat-insulating sleeve 2 is fitted onto the valve body 1, located on the side of the baffle 14 away from the valve seat 11. The heat-insulating sleeve 2 includes a first heat-insulating block 21 and a second heat-insulating block 22. The first heat-insulating block 21 has a locking block 23, and the side of the second heat-insulating block 22 has a slot 231 for the locking block 23 to be inserted, extending through to the outer surface of the second heat-insulating block 22. When the locking block 23 is inserted into the slot 231, the first heat-insulating block 21 and the second heat-insulating block 22 are fixed together. Both the first heat-insulating block 21 and the second heat-insulating block 22 have internal cavities filled with nitrogen gas.

[0034] Reference Figure 2 Connecting pieces 24 are fixedly connected to the end faces of the first insulation block 21 and the second insulation block 22, and the connecting pieces 24 extend circumferentially along the insulation sleeve 2. A connecting groove 241 for inserting the connecting pieces 24 is provided on the end face of the baffle 14, and the connecting groove 241 extends circumferentially along the baffle 14. The operator first inserts the locking block 23 into the locking groove 231 to assemble the first insulation block 21 and the second insulation block 22, and then inserts the connecting piece 24 into the connecting groove 241 to install the insulation sleeve 2 on the baffle 14.

[0035] Reference Figure 1 and Figure 2 The outer surfaces of the first insulation block 21 and the second insulation block 22 are both provided with fixing grooves 25. A fixing spring 251 for inserting into the fixing groove 25 is fixedly connected to the baffle 14. The insulation sleeve 2 has a through hole 26 communicating with the fixing groove 25. A limiting strip 261 is slidably connected within the through hole 26, and the fixing spring 251 can be inserted into the through hole 26. An annular groove 15 is provided on the outer surface of the valve body 1, allowing the limiting strip 261 to be inserted. When the limiting strip 261 is inserted into the annular groove 15, it restricts the insulation sleeve 2 from moving vertically along the valve body 1.

[0036] Reference Figure 2 When the fixing spring 251 is inserted into the fixing groove 25, the fixing spring 251 pushes the limiting strip 261 to move, so that the limiting strip 261 moves from the fixing groove 25 to the annular groove 15, thereby fixing the heat insulation sleeve 2 to the valve body 1.

[0037] Reference Figure 2 Two elastic strips 27 are slidably connected to the inner surface of the insulation sleeve 2. The elastic strips 27 can be bent toward the valve body 1. The two elastic strips 27 are symmetrically distributed along the axis of the insulation sleeve 2, and the elastic strips 27 can slide along the length of the valve body 1. An elastic block 271 is fixedly connected to the inner surface of the insulation sleeve 2. The elastic block 271 is arranged in a ring shape.

[0038] Reference Figure 1 and Figure 2 An elastic inclined surface 272 is formed on the surface of the elastic block 271 near the valve seat 11. The distance between the elastic inclined surface 272 and the valve seat 11 gradually increases along the direction from the insulation sleeve 2 to the valve body 1, and the elastic inclined surface 272 is located on the moving path of the elastic strip 27. A limiting inclined surface 262 is formed on the surface of the limiting strip 261 near the valve body 1. The distance between the limiting inclined surface 262 and the valve seat 11 gradually decreases along the direction from the insulation sleeve 2 to the valve body 1, and the moving path of the limiting inclined surface 262 intersects the moving path of the elastic strip 27.

[0039] Reference Figure 2 When the fixing spring 251 is inserted into the through hole 26, the fixing spring 251 drives the limiting strip 261 to move, so that the limiting strip 261 drives the elastic strip 27 to move through the limiting inclined surface 262. The elastic strip 27 can deform along the elastic inclined surface 272 towards the valve body 1, so that the elastic strip 27 can abut against the outer surface of the valve body 1.

[0040] Reference Figure 2 The valve body 1 is provided with a water-absorbing block 28, which is made of cellulose-based material. The water-absorbing block 28 can absorb moisture from the air, and it can expand after absorbing a sufficient amount of moisture. The water-absorbing block 28 can be placed on the side of the limiting strip 261 away from the valve seat 11.

[0041] Reference Figure 2 When the staff replaces the water-absorbing block 28, the staff uses a tool to bend the elastic strip 27 and the elastic block 271, and uses the tool to insert the new water-absorbing block 28 into the insulation sleeve 2. Then, the staff uses the new water-absorbing block 28 to push the old water-absorbing block 28 to move, so that the old water-absorbing block 28 falls from the limiting strip 261. That is, the new water-absorbing block 28 can be placed on the limiting strip 261, so that the water-absorbing block 28 can be smoothly positioned between the insulation sleeve 2 and the valve body 1, and the water-absorbing block 28 can abut against the side of the limiting strip 261 away from the valve seat 11.

[0042] Reference Figure 2 and Figure 3A receiving groove 29 is formed on the outer surface of the valve body 1, and an alarm is fixedly connected inside the receiving groove 29. A driving component 291 is provided inside the receiving groove 29, which includes a driving block 292 and two driving springs 293. One end of the driving spring 293 is fixedly connected to the bottom wall of the receiving groove 29, and the other end is fixedly connected to the surface of the driving block 292. The driving spring 293 drives the driving block 292 to move away from the bottom wall of the receiving groove 29, preventing the driving block 292 from contacting the alarm.

[0043] Reference Figure 2 and Figure 3 A driving arc surface 294 is provided on the surface of the driving block 292. The driving arc surface 294 protrudes in a direction away from the driving spring 293, and the moving path of the driving arc surface 294 intersects with the expansion path of the water absorption block 28.

[0044] Reference Figure 1 When the absorbent block 28 has not absorbed enough water, it does not abut against the drive block 292. At this time, the drive spring 293 causes the drive block 292 to protrude out of the receiving groove 29, meaning the drive block 292 does not abut against the alarm. When the absorbent block 28 has absorbed enough water, it abuts against the drive block 292 through the drive arc surface 294, allowing the drive block 292 to be inserted into the receiving groove 29. This activates the alarm, alerting staff that the absorbent block 28 needs to be replaced or the shut-off valve needs to be inspected.

[0045] The implementation principle of an ultra-low temperature shut-off valve according to an embodiment of this application is as follows: First, the operator installs the first insulation block 21 and the second insulation block 22 on the valve body 1, inserts the locking block 23 into the locking groove 231 to assemble the insulation sleeve 2, and then places the insulation sleeve 2 on the baffle 14 to insert the fixing spring 251 into the through hole 26, so that the fixing spring 251 drives the limiting strip 261 to move, so that the limiting strip 261 drives the elastic strip 27 to move, so that the elastic strip 27 abuts against the outer surface of the valve body 1, and then the limiting strip 261 can be inserted into the annular groove 15 to fix the insulation sleeve 2. Finally, the operator drives the water absorption block 28 to deform the elastic strip 27 and the elastic block 271, so that the water absorption block 28 abuts against the limiting strip 261 to install the water absorption block 28.

[0046] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A cryogenic shut-off valve, comprising a valve seat (11) and a valve body (1), wherein the valve seat (11) is disposed on the valve body (1), and the valve body (1) is provided with a valve stem (12) for opening and closing the valve seat (11), and the valve body (1) is provided with a packing portion for sealing the gap between the valve body (1) and the valve stem (12), characterized in that: The valve body (1) is fitted with a heat insulation sleeve (2), the valve body (1) is provided with a baffle (14), the heat insulation sleeve (2) is located on the side of the baffle (14) away from the valve seat (11), and the heat insulation sleeve (2) is located on the outside of the packing part; The baffle (14) is provided with a fixing spring (251), and the heat insulation sleeve (2) is provided with a fixing groove (25) for the fixing spring (251) to be inserted; The insulation sleeve (2) has a through hole (26) that connects to the fixing groove (25). A limiting strip (261) is slidably connected in the through hole (26). The valve body (1) has an annular groove (15) for the limiting strip (261) to be inserted. When the fixing spring (251) is inserted into the through hole (26), the limiting strip (261) is inserted into the annular groove (15). The insulation sleeve (2) is provided with a water-absorbing block (28), which is placed on the limiting strip (261). The water-absorbing block (28) is used to absorb water and is located between the insulation sleeve (2) and the valve body (1). An elastic strip (27) is slidably connected to the heat insulation sleeve (2). The elastic strip (27) is located on the moving path of the limiting strip (261). The elastic strip (27) can bend in the direction of the valve body (1). When the elastic strip (27) protrudes through the hole (26), the elastic strip (27) abuts against the valve body (1). A limiting slope (262) is provided on the surface of the limiting strip (261) near the valve body (1). The distance between the limiting slope (262) and the valve seat (11) gradually decreases along the direction from the insulation sleeve (2) to the valve body (1). The moving path of the limiting slope (262) intersects the moving path of the elastic strip (27). An elastic block (271) is fixedly connected to the inner surface of the insulation sleeve (2), and the elastic block (271) is arranged in a ring shape; When the staff replaces the water-absorbing block (28), the staff uses a tool to bend the elastic strip (27) and the elastic block (271), and uses the tool to insert the new water-absorbing block (28) into the insulation sleeve (2). Then the staff pushes the old water-absorbing block (28) to move through the new water-absorbing block (28), so that the old water-absorbing block (28) falls from the limiting strip (261), that is, the new water-absorbing block (28) can be placed on the limiting strip (261), so that the water-absorbing block (28) can be smoothly located between the insulation sleeve (2) and the valve body (1), and the water-absorbing block (28) can abut against the side of the limiting strip (261) away from the valve seat (11).

2. The cryogenic shut-off valve according to claim 1, characterized in that: The water-absorbing block (28) is located between one end of the elastic strip (27) that abuts against the valve body (1) and the other end of the limiting strip (261) that abuts against the valve body (1).

3. The cryogenic shut-off valve according to claim 2, characterized in that: An alarm is provided on the valve body (1), and a drive component (291) is provided on the alarm. The drive component (291) is used to activate the alarm. The water-absorbing block (28) expands in volume after absorbing water, and the drive component (291) is located on the expansion path of the water-absorbing block (28). When the water-absorbing block (28) absorbs enough water, the water-absorbing block (28) abuts against the drive component (291), and the drive component (291) activates the alarm. When the water-absorbing block (28) does not absorb enough water, the water-absorbing block (28) does not abut against the drive component (291).

4. The cryogenic shut-off valve according to claim 3, characterized in that: The driving component (291) includes a driving block (292) and a driving spring (293). The driving spring (293) is disposed on the valve body (1), and the driving block (292) is disposed on the driving spring (293). The driving spring (293) drives the driving block (292) to move away from the valve body (1). The moving path of the driving block (292) intersects with the expansion path of the water-absorbing block (28). When the water-absorbing block (28) absorbs sufficient water, the water-absorbing block (28) activates the alarm through the driving block (292).

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