A liquid hydrogen stop valve

Abstract

The present application relates to the field of stop valves. A liquid hydrogen stop valve includes a valve body assembly, a valve cover, a valve stem assembly, a valve flap, a first sealing assembly, a second sealing assembly and a third sealing assembly. The valve body assembly includes a main body, an extension tube and a connecting seat. A first channel is provided at the upper end of the main body. The valve flap is slidably embedded in the first channel. One end of the extension tube is connected to the upper end of the main body. The connecting seat is connected to the other end of the extension tube. The valve cover is connected to the connecting seat. One end of the valve stem assembly is connected to the upper end of the valve flap. The first sealing assembly, the second sealing assembly and the third sealing assembly are all sleeved on the outer periphery of the valve stem assembly. The first sealing assembly is embedded in the first channel, the second sealing assembly is embedded in the extension tube, and the third sealing assembly is embedded in the valve cover. The first sealing assembly, the second sealing assembly and the third sealing group are provided. The multiple sealing structures reduce the possibility of gas leakage in the stop valve, improve the sealing performance between the valve stem assembly and the main body, the extension tube and the valve cover, and improve the safety of the stop valve.

Description

Technical Field

[0001] The present application relates to the technical field of stop valves, and in particular to a liquid hydrogen stop valve. Background Art

[0002] With the rapid development of my country's hydrogen energy industry, the demand for hydrogen energy is showing explosive growth. The current storage and transportation methods of high-pressure gaseous hydrogen will be difficult to meet the future application requirements of low-cost and high-convenience hydrogen energy. The application of liquid hydrogen is ushering in a turning point.

[0003] Compared with the existing high-pressure gaseous hydrogen, liquid hydrogen has the advantages of low pressure, high energy density, and convenient storage and transportation. The boiling point of liquid hydrogen at one atmosphere is 20.37 K (-252.78°C), and the freezing point is 13.96 K (-259.19°C). Most of the liquid hydrogen is transported through pipelines, and the stop valve is also a commonly used valve on the liquid hydrogen transportation pipeline. The valve of the stop valve plays an important role in cutting off and throttling the medium in the pipeline. In the process of liquid hydrogen transportation, there is a situation where liquid hydrogen vaporizes into hydrogen gas and flows out from the gap between the valve stem and the valve body to combine with air, which is prone to combustion or even explosion. Therefore, in order to ensure the safety of liquid hydrogen storage and transportation, a low-temperature liquid hydrogen valve with safe and reliable sealing is particularly important. Summary of the invention

[0004] In order to improve the sealing performance between the valve stem and the valve body, reduce the possibility of hydrogen leakage, and improve the safety of the stop valve, the present application provides a liquid hydrogen stop valve.

[0005] The liquid hydrogen stop valve provided in this application adopts the following technical solution:

[0006] A liquid hydrogen stop valve comprises a valve body assembly, a valve cover, a valve stem assembly, a valve disc, a first sealing assembly, a second sealing assembly and a third sealing assembly. The valve body assembly comprises a main body, an extension tube and a connecting seat. A first channel is provided at the upper end of the main body, two second channels are provided at the inner wall of the first channel, the second channel connects the first channel with the outside, the valve disc is slidably embedded in the first channel, one end of the extension tube is connected to the upper end of the main body, the connecting seat is connected to the other end of the extension tube, the valve cover is connected to the connecting seat, one end of the valve stem assembly is connected to the upper end of the valve disc, the first sealing assembly, the second sealing assembly and the third sealing assembly are all sleeved on the outer periphery of the valve stem assembly, the first sealing assembly is embedded in the first channel, the second sealing assembly is embedded in the extension tube, and the third sealing assembly is embedded in the valve cover.

[0007] By adopting the above technical solution, a first sealing assembly, a second sealing assembly and a third sealing group are set, and the multiple sealing structures reduce the possibility of gas leakage in the stop valve, improve the sealing performance between the valve stem assembly and the main body, the extension tube and the valve cover, and improve the safety of the stop valve.

[0008] Preferably, it also includes a spacer ring, which is sleeved on the outer periphery of the valve stem assembly, and is embedded in the extension tube. The lower end of the spacer ring extends into the first channel, and the other end of the spacer ring extends into the inner side of the connecting seat.

[0009] By adopting the above technical solution, a spacer ring is provided to reduce the space in the valve body assembly, reduce the volume of liquid hydrogen that can be accommodated in the valve body assembly, reduce the possibility of thermal convection of liquid hydrogen in the valve body assembly, and ensure the safety of the stop valve.

[0010] Preferably, the first sealing assembly includes a first Variseal ring, which is sleeved on the outer circumference of the valve stem assembly, and the outer wall of the first Variseal ring is pressed against the inner wall of the first channel; the second sealing assembly includes a bellows, a connector and a second sealing ring, the connector is embedded in the inner side of the connecting seat, a second annular groove is provided on the outer circumference of the connector, the second sealing ring is embedded in the second annular groove, the outer circumference of the second sealing ring is pressed against the inner wall of the connecting seat, one end of the connector extends into the spacer ring, the bellows is sleeved on the outer circumference of the valve stem assembly, the upper end of the bellows is connected to the lower end of the connector, and the third sealing assembly includes a sealing ring and a second Variseal ring, both of which are sleeved on the outer circumference of the valve stem assembly, and the outer walls of the sealing ring and the second Variseal ring are pressed against the inner wall of the valve cover.

[0011] By adopting the above technical solution, the first sealing assembly includes a first Vane ring, the outer wall of the first Vane ring is pressed against the inner wall of the first channel, thereby improving the sealing performance between the valve stem assembly and the first channel; the second sealing assembly includes a bellows, a connector and a second sealing ring, the bellows is connected to the lower end of the connector, a second annular groove is provided on the outer periphery of the connector, and the second sealing ring is embedded in the second annular groove, thereby improving the sealing performance between the valve stem assembly, the extension tube and the connecting seat; the third sealing assembly includes a sealing ring and a second Vane ring, the outer walls of the sealing ring and the second Vane ring are pressed against the inner wall of the valve cover, thereby improving the sealing performance between the valve stem assembly and the valve cover, thereby improving the safety of the stop valve.

[0012] Preferably, a plurality of heat dissipation rings are connected to the outer periphery of the connecting seat, and the plurality of heat dissipation rings are distributed at intervals along the axial direction of the connecting seat.

[0013] By adopting the above technical solution, a plurality of heat dissipation rings are connected to the outer periphery of the connecting seat, which helps to improve the heat dissipation efficiency at the connecting seat and reduce the possibility of ice damage to the second sealing component.

[0014] Preferably, a replacement component is further included, the connecting seat is provided with a connecting hole, the connecting hole connects the inner side of the connecting seat with the outside, the connecting hole is directly opposite to the outer wall of the spacer ring extending into the inner side of the connecting seat, the replacement component includes a ferrule joint and a ferrule plug, one end of the ferrule joint is connected to the connecting seat, the ferrule joint is connected to the connecting hole, and the ferrule plug is connected to the end of the ferrule joint away from the connecting seat.

[0015] By adopting the above technical solution, the air in the valve body assembly can be evacuated before use, and then the inert gas can be filled into the valve body assembly to reduce the possibility of water vapor in the air in the valve body assembly being liquefied by cooling and then solidified, thereby improving the safety of the stop valve.

[0016] Preferably, it further comprises a screw plug, the valve cover is provided with a detection hole, the detection hole connects the inner side of the valve cover with the outside, the detection hole is located on a side of the third sealing component close to the connecting seat, and the screw plug is embedded in the detection hole.

[0017] By adopting the above technical solution, the screw plug can be opened, the gas inside the valve cover can be extracted, and whether it contains hydrogen and the concentration of hydrogen can be detected. If the hydrogen concentration is too high, the liquid hydrogen transportation needs to be stopped and the stop valve needs to be repaired to ensure the safety of the stop valve.

[0018] Preferably, it also includes a clamping assembly, which includes a clamping block and a first reset member. The valve cover is provided with an annular cavity, and a clamping groove is provided at the inner cavity wall of the annular cavity. The clamping block is slidably embedded in the clamping groove. The clamping block is used to clamp the outer wall of the sealing ring. The first reset member is connected between the clamping block and the valve cover. The first reset member makes the clamping block tend to be embedded in the clamping groove. An air intake channel is provided at the lower cavity wall of the annular cavity, and the air intake channel is connected to the detection hole.

[0019] By adopting the above technical solution, when the sealing performance of the first sealing assembly and the second sealing assembly is reduced, hydrogen from the vaporization of liquid hydrogen enters the annular cavity through the air inlet channel, the air pressure in the annular cavity increases, and the tightening block is pushed to overcome the elastic force of the first reset member and tighten the outer wall of the sealing ring, thereby improving the sealing performance between the sealing ring and the valve stem assembly and improving the installation cavity of the stop valve.

[0020] Preferably, it also includes a warning component, which includes a light strip, a static contact piece, a moving contact piece, a second reset piece and a processor, the light strip is connected to the valve cover, the upper cavity wall of the annular cavity is provided with a slide groove, the static contact piece is embedded in the slide groove, the moving contact piece is slidably embedded in the slide groove, the second reset piece is connected between the moving contact piece and the valve cover, the second reset piece makes the moving contact piece tend to move away from the static contact piece, the static contact piece and the moving contact piece are electrically connected to the processor, and the processor is used to control the operation of the light strip.

[0021] By adopting the above technical solution, when the air pressure in the ring cavity increases, the moving contact piece is pushed to slide and fit with the static contact piece. The processor receives the signal and sends a signal to the light strip, causing the light strip to light up, prompting the staff to inspect the stop valve to ensure the safety of the stop valve.

[0022] Preferably, it also includes a sliding seat, a fixing rod and a third reset member, a connecting groove is provided on a side of the sliding groove close to the outer wall of the valve cover, the connecting groove is connected to the outside, the fixing rod is slidably embedded in the connecting groove, the sliding seat is connected to the side of the moving contact piece away from the static contact piece, the side wall of the sliding seat is provided with a fixing groove, the fixing groove is used for the fixing rod to be embedded, a first chamfer is provided on one end of the fixing rod close to the sliding seat, the first chamfer is located on the side of the fixing rod close to the annular cavity, the first chamfer is used for the sliding seat to abut, the third reset member is connected between the fixing rod and the valve cover, and the third reset member makes the fixing rod have a tendency to extend into the sliding groove.

[0023] By adopting the above technical solution, the sliding seat slides, driving the moving contact piece to slide, and the sliding seat presses against the first chamfer, pushing the fixed rod to overcome the elastic force of the third reset piece to slide. When the fixed groove is opposite to the connecting groove, the moving contact piece and the static contact piece fit together, and the fixed rod is embedded in the fixed groove under the action of the elastic force of the third reset piece, thereby realizing a fixed connection between the sliding seat and the valve cover, so that the light strip is always on, which is helpful for staff to observe.

[0024] Preferably, it also includes an insulation jacket, one end of which is connected to the connecting seat, and the insulation jacket is sleeved on the outer circumference of the main body and the extension tube, and there is a gap between the inner wall of the insulation jacket and the outer wall of the main body and the extension tube.

[0025] By adopting the above technical solution, the insulation jacket is arranged on the outer periphery of the main body and the extension tube and there is a gap between the inner wall of the insulation jacket and the outer wall of the main body and the extension tube. The air between the insulation jacket and the main body and the extension tube can be extracted, so that a vacuum state is maintained between the insulation jacket and the main body and the extension tube, thereby achieving the purpose of heat insulation and reducing the heat conduction loss of cold energy.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The first sealing assembly, the second sealing assembly and the third sealing group are set, and the multiple sealing structures reduce the possibility of gas leakage in the stop valve, improve the sealing performance between the valve stem assembly and the main body, the extension pipe and the valve cover, and improve the safety of the stop valve;

[0028] 2. Several heat dissipation rings are connected to the outer periphery of the connection seat, which helps to improve the heat dissipation efficiency at the connection seat and reduce the possibility of ice damage to the second sealing component;

[0029] 3. When the air pressure in the ring cavity increases, the moving contact piece is pushed to slide and fit with the static contact piece. The processor receives the signal and sends a signal to the light strip, making the light strip light up, prompting the staff to inspect the stop valve to ensure the safety of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of a liquid hydrogen stop valve.

[0031] Figure 2 It is a partial cross-sectional view of the liquid hydrogen stop valve.

[0032] Figure 3 It is a cross-sectional view of a liquid hydrogen stop valve.

[0033] Figure 4 It is a partial cross-sectional view of the liquid hydrogen stop valve.

[0034] Figure 5 yes Figure 2 Enlarged view of point A in the middle.

[0035] Figure 6 It is a cross-sectional view of a liquid hydrogen stop valve.

[0036] Figure 7 It is a partial cross-sectional view of the liquid hydrogen stop valve.

[0037] Description of reference numerals:

[0038] 1. Valve body assembly; 11. Main body; 111. First channel; 112. Second channel; 113. First embedded groove; 114. First inclined surface; 12. Extension tube; 13. Connecting seat; 131. Heat dissipation ring; 132. Communication hole; 133. First through hole; 134. First step groove; 135. Third embedded groove; 136. Avoidance groove; 137. First connecting ring; 138. Fixing hole; 139. Second step groove;

[0039] 2. Valve cover; 21. Detection hole; 22. Ring cavity; 23. Tightening groove; 24. Air inlet channel; 25. Slide groove; 26. Communication groove; 27. Second connecting ring; 271. Connecting hole; 28. Second through hole; 29. ​​Fourth embedded groove; 210. First boss; 211. Second boss; 212. Guide groove; 213. Fifth embedded groove; 214. Sixth embedded groove; 215. Air outlet channel; 216. Accommodating groove; 217. Third ring groove; 218. Seventh embedded groove; 219. Lifting groove; 220. Eighth embedded groove;

[0040] 3. Valve stem assembly; 31. First ring groove;

[0041] 4. valve disc; 41. connecting column; 411. slot; 42. second embedding slot;

[0042] 5. Sealing mechanism; 51. First sealing assembly; 511. First universal seal ring; 512. Gasket; 52. Second sealing assembly; 521. Bellows; 522. Connector; 5221. First section; 52211. Second ring groove; 52212. Groove; 5222. Second section; 5223. Third section; 523. Second sealing ring; 53. Third sealing assembly; 531. Sealing ring; 5311. Inner ring groove; 5312. Outer ring groove; 532. Second universal seal ring; 533. Slip baffle; 534. Inner sealing ring; 535. Outer sealing ring; 54. Fourth sealing assembly; 541. Sealing seat; 542. Pressing plate; 543. First compression nut; 544. Elastic washer;

[0043] 61. Insulation jacket; 62. Spacer ring; 621. First stop ring; 63. Replacement assembly; 631. Compression fitting; 632. Compression plug; 64. Screw plug; 65. Connecting stud; 66. Connecting nut; 67. Steel ball;

[0044] 7. Protection mechanism; 71. Tightening assembly; 711. Tightening block; 712. First reset member; 72. Warning assembly; 721. Light strip; 722. Static contact piece; 723. Moving contact piece; 724. Second reset member; 725. Sliding seat; 7251. Fixing groove; 7252. First insert block; 73. Fixing assembly; 731. Fixing rod; 7311. First chamfer; 7312. Second insert block; 732. Third reset member;

[0045] 8. Adjustment assembly; 81. Sleeve; 811. Fourth connecting ring; 82. Thrust ball bearing; 83. Second clamping nut; 84. Hand wheel; 85. Tightening nut. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings.

[0047] Reference Figure 1The embodiment of the present application discloses a liquid hydrogen stop valve including a valve body assembly 1 and a spacer ring 62. The valve body assembly 1 includes a main body 11, an extension tube 12 and a connecting seat 13. A first channel 111 is provided at the upper end of the main body 11. A second channel 112 is provided at the inner wall of the first channel 111. The second channel 112 connects the first channel 111 with the outside. Two second channels 112 are provided. The two second channels 112 are respectively located on both sides of the first channel 111 along the horizontal direction. The axes of the two second channels 112 are coplanar with the axis of the first channel 111. The axis of the second channel 112 intersects with the axis of the first channel 111 and is not perpendicular. A first embedded groove 113 is provided at the inner wall of the first channel 111. The upper end of the first embedded groove 113 is connected to the outside. The lower end of the spacer ring 62 is coaxially embedded in the first embedded groove 113. The outer wall of the spacer ring 62 fits the groove wall of the first embedded groove 113. The lower end of the extension tube 12 is fixedly connected to the upper end of the main body 11, the axis of the extension tube 12 coincides with the axis of the first channel 111, the inner wall of the extension tube 12 is flush with the wall of the first embedded groove 113, and the inner wall of the extension tube 12 is in contact with the outer wall of the spacer ring 62. The lower end of the connecting seat 13 is fixedly connected to the upper end of the extension tube 12, and the connecting seat 13 is coaxially provided with a first through hole 133, the hole wall of the first through hole 133 is flush with the inner wall of the extension tube 12, the upper end of the spacer ring 62 extends into the first through hole 133, and the outer wall of the spacer ring 62 is in contact with the hole wall of the first through hole 133. A first step groove 134 is provided at the hole wall of the first through hole 133 away from one end of the extension tube 12, and a first limiting ring 621 is fixedly connected to the outer wall of the spacer ring 62, the first limiting ring 621 is embedded in the first step groove 134, and the outer wall of the first limiting ring 621 is in contact with the groove wall of the first step groove 134.

[0048] Reference Figure 1 and Figure 2 , a liquid hydrogen stop valve also includes a replacement component 63. The replacement component 63 includes a ferrule joint 631 and a ferrule plug 632. The connection seat 13 is provided with a connecting hole 132, and the connecting hole 132 is connected to the outside and the first step groove 134. A third embedded groove 135 is provided on the side of the connection hole 271 away from the first step groove 134, one end of the ferrule joint 631 is embedded in the third embedded groove 135, the ferrule joint 631 is connected to the connecting hole 132, and the ferrule plug 632 is fixedly connected to the other end of the ferrule joint 631.

[0049] A liquid hydrogen stop valve also includes an insulation jacket 61. An avoidance groove 136 is coaxially provided on the outer periphery of the connection seat 13 near one end of the extension tube 12, and a first connection ring 137 is coaxially fixedly connected to the bottom of the avoidance groove 136. A plurality of heat dissipation rings 131 are fixedly connected to the bottom of the avoidance groove 136. The plurality of heat dissipation rings 131 are located on the side of the first connection ring 137 away from the extension tube 12, and the plurality of heat dissipation rings 131 are spaced apart along the axis of the connection seat 13. In this embodiment, two heat dissipation rings 131 are provided. The upper end of the insulation jacket 61 is fixedly connected to the first connection ring 137, and the insulation jacket 61 is sleeved on the outer periphery of the main body 11 and the extension tube 12, and there is a gap between the inner wall of the insulation jacket 61 and the outer wall of the main body 11 and the extension tube 12.

[0050] Reference Figure 1 , a liquid hydrogen stop valve also includes a valve cover 2, a connecting stud 65 and a connecting nut 66. The lower end of the valve cover 2 is fixedly connected to the upper end of the connecting seat 13, and the outer periphery of the lower end of the valve cover 2 is connected to a second connecting ring 27, and the lower end of the second connecting ring 27 fits with the upper end of the connecting seat 13. A plurality of fixing holes 138 are provided at the upper end of the connecting seat 13, and the plurality of fixing holes 138 are evenly distributed circumferentially along the axis of the connecting seat 13. In this embodiment, three fixing holes 138 are provided. The second connecting ring 27 is provided with a connecting hole 271, and the number of connecting holes 271, connecting studs 65 and connecting nuts 66 is the same as the number of fixing holes 138 and corresponds one to one. The lower end of the connecting stud 65 passes through the connecting hole 271 and is threadedly connected to the fixing hole 138, and the connecting nut 66 is threadedly connected to the upper end of the connecting stud 65, and the connecting nut 66 abuts against the side surface of the second connecting ring 27 away from the connecting seat 13.

[0051] Reference Figure 3 and Figure 4 A liquid hydrogen stop valve also includes a valve disc 4 and a sealing mechanism 5. The valve disc 4 is coaxially slidably embedded in the first channel 111, and the end of the valve disc 4 away from the extension tube 12 is coaxially fixedly connected with the connecting column 41. The sealing mechanism 5 includes a fourth sealing assembly 54, and the fourth sealing assembly 54 includes a sealing seat 541, a pressure plate 542, a first clamping nut 543 and an elastic gasket 544. The sealing seat 541 is coaxially sleeved on the outer periphery of the connecting column 41, the pressure plate 542 is coaxially sleeved on the outer periphery of the connecting column 41, the pressure plate 542 is pressed against the side surface of the sealing seat 541 away from the valve disc 4, the first clamping nut 543 is threadedly connected to the outer periphery of the connecting column 41, the first clamping nut 543 is pressed against the side surface of the pressure plate 542 away from the sealing seat 541, the outer periphery of the connecting column 41 is provided with a card groove 411, the elastic gasket 544 is embedded in the card groove 411, and the elastic gasket 544 is pressed against the side surface of the first clamping nut 543 away from the pressure plate 542. A first inclined surface 114 is disposed on the inner wall of the first channel 111 , and the first inclined surface 114 is used for abutting against the outer wall of the sealing seat 541 .

[0052] Reference Figure 1 and Figure 4A liquid hydrogen stop valve also includes a valve stem assembly 3. A second embedding groove 42 is provided at the upper end of the valve disc 4, and the second embedding groove 42 penetrates the valve disc 4 in a direction perpendicular to the sliding direction of the valve disc 4. The lower end of the valve stem assembly 3 is embedded in the second embedding groove 42, and the axis of the valve stem assembly 3 coincides with the axis of the valve disc 4.

[0053] Reference Figure 1 and Figure 2 , a liquid hydrogen stop valve also includes an adjustment component 8. The valve cover 2 is provided with a second through hole 28, and the upper end of the valve stem component 3 passes through the spacer ring 62 and the valve cover 2 in sequence and then extends out of the second through hole 28. The adjustment component 8 includes a screw sleeve 81, a thrust ball bearing 82, a second clamping nut 83, a handwheel 84 and a clamping nut 85. A fourth embedded groove 29 is coaxially provided at the hole wall of the second through hole 28 away from one end of the connecting seat 13, and the lower end of the screw sleeve 81 is coaxially rotatably embedded in the fourth embedded groove 29, and the screw sleeve 81 is threadedly connected to the valve stem component 3. A fourth connecting ring 811 is fixedly connected to the outer periphery of the screw sleeve 81, and a thrust ball bearing 82 is coaxially sleeved on the outer periphery of the screw sleeve 81, and one end of the thrust ball bearing 82 abuts against a side surface of the fourth connecting ring 811 away from the bottom of the fourth embedded groove 29, and the second clamping nut 83 is threadedly connected in the fourth embedded groove 29, and the second clamping nut 83 abuts against one end of the thrust ball bearing 82 away from the fourth connecting ring 811. The hand wheel 84 is coaxially slidably connected to the outer periphery of the screw sleeve 81 , and the tightening nut 85 is threadedly connected to the upper end of the screw sleeve 81 , and the tightening nut 85 abuts against a side surface of the hand wheel 84 away from the valve cover 2 .

[0054] Reference Figure 3 and Figure 4 The sealing mechanism 5 also includes a first sealing component 51, which includes a first Variseal ring 511 and a gasket 512. The first Variseal ring 511 is coaxially sleeved on the outer periphery of the valve stem component 3, and the outer wall of the first Variseal ring 511 is pressed against the inner wall of the first channel 111. Two gaskets 512 are provided, and the two gaskets 512 are both sleeved on the outer periphery of the valve stem component 3. The two gaskets 512 are respectively located on both sides of the first Variseal ring 511 along the axial direction of the valve stem component 3.

[0055] Reference Figure 2 and Figure 3The sealing mechanism 5 also includes a second sealing assembly 52, which includes a bellows 521, a connector 522 and a second sealing ring 523. A second step groove 139 is coaxially provided at the groove wall of the first step groove 134 away from the extension tube 12. A first boss 210 is coaxially fixedly connected to the lower end of the valve cover 2. The first boss 210 is coaxially embedded in the second step groove 139, and the outer wall of the first boss 210 fits the groove wall of the second step groove 139. The connector 522 and the bellows 521 are coaxially sleeved on the outer periphery of the valve stem assembly 3, and the connector 522 includes a first section 5221, a second section 5222 and a third section 5223. The first section 5221 is embedded in the second step groove 139, the outer wall of the first section 5221 is in contact with the groove wall of the second step groove 139, the outer periphery of the first section 5221 is provided with a second annular groove 52211, the second sealing ring 523 is embedded in the second annular groove 52211, and the outer wall of the second sealing ring 523 is pressed against the groove wall of the second step groove 139. A groove 52212 is provided at one end of the first section 5221 away from the spacer ring 62, the side of the first boss 210 away from the valve cover 2 is coaxially fixedly connected with the second boss 211, the second boss 211 is embedded in the groove 52212, and the surface of the side of the second boss 211 away from the first boss 210 is pressed against the bottom of the groove 52212. The second section 5222 is coaxially fixedly connected to one end of the first section 5221 close to the spacer ring 62, the second section 5222 is embedded in the first step groove 134, the outer wall of the second section 5222 is in contact with the groove wall of the first step groove 134, and the end of the second section 5222 away from the first section 5221 abuts against one end of the spacer ring 62 close to the valve cover 2. The third section 5223 is coaxially fixedly connected to one end of the second section 5222 away from the first section 5221, the third section 5223 is embedded in the spacer ring 62, and the upper end of the bellows 521 is coaxially fixedly connected to one end of the third section 5223 away from the second section 5222.

[0056] A liquid hydrogen stop valve further includes a steel ball 67, and a plurality of guide grooves 212 are provided on the wall of the second through hole 28, and the plurality of guide grooves 212 are evenly distributed around the axis of the valve stem assembly 3. In this embodiment, six guide grooves 212 are provided. A first annular groove 31 is provided on the outer periphery of the valve stem assembly 3, and the number of steel balls 67 is the same as the number of guide grooves 212 and corresponds one to one. The steel ball 67 is embedded in the first annular groove 31, and the steel ball 67 is slidably embedded in the guide groove 212, and the sliding direction of the steel ball 67 is parallel to the axial direction of the valve stem assembly 3.

[0057] Reference Figure 3 and Figure 5The sealing mechanism 5 further includes a third sealing assembly 53, which includes a sealing ring 531, a second Variseal ring 532 and a slip stopper 533. The sealing ring 531 is coaxially sleeved on the outer periphery of the valve stem assembly 3. A fifth embedded groove 213 is provided on the wall of the second through hole 28. The upper end of the fifth embedded groove 213 is connected to the fourth embedded groove 29. The sealing ring 531 is embedded in the fifth embedded groove 213. The outer wall of the sealing ring 531 is pressed against the groove wall of the fifth embedded groove 213. The second Variseal ring 532 is sleeved on the outer periphery of the valve stem assembly 3. The second Variseal ring 532 is located on the side of the sealing ring 531 close to the connecting seat 13. The outer wall of the second Variseal ring 532 is pressed against the groove wall of the fifth embedded groove 213. A sixth embedded groove 214 is provided on the groove wall of the fifth embedded groove 213. The slip stopper 533 is embedded in the sixth embedded groove 214. The slip stopper 533 is pressed against the end of the sealing ring 531 away from the second Variseal ring 532.

[0058] The third sealing assembly 53 also includes an inner sealing ring 534 and an outer sealing ring 535. An inner ring groove 5311 is provided on the inner wall of the sealing ring 531. The inner sealing ring 534 is embedded in the inner ring groove 5311. The inner wall of the inner sealing ring 534 is pressed against the outer wall of the valve stem assembly 3. An outer ring groove 5312 is provided on the outer wall of the sealing ring 531. The outer ring groove 5312 is located below the inner ring groove 5311. The outer sealing ring 535 is embedded in the outer ring groove 5312. The outer wall of the outer sealing ring 535 is pressed against the groove wall of the fifth embedded groove 213.

[0059] A liquid hydrogen stop valve further includes a screw plug 64. The valve cover 2 is provided with a detection hole 21, the detection hole 21 is located below the fifth embedding groove 213, and the detection hole 21 communicates with the second through hole 28 and the outside. The screw plug 64 is embedded in the detection hole 21 to achieve the blocking of the detection hole 21.

[0060] Reference Figure 5 and Figure 6, a liquid hydrogen stop valve also includes a protection mechanism 7. The valve cover 2 is provided with an annular cavity 22, and an air inlet channel 24 is provided at the lower cavity wall of the annular cavity 22, and the air inlet channel 24 is connected to the detection hole 21. A plurality of tightening grooves 23 are provided at the groove wall of the fifth embedding groove 213, and the plurality of tightening grooves 23 are evenly distributed circumferentially around the axis of the valve cover 2. In this embodiment, four tightening grooves 23 are provided. An air outlet channel 215 is provided at the bottom of the tightening groove 23, and the air outlet channel 215 is connected to the annular cavity 22. The protection mechanism 7 includes a tightening assembly 71, and the tightening assembly 71 includes a tightening block 711 and a first reset member 712. The number of the tightening blocks 711 is the same as the number of the tightening grooves 23 and corresponds one to one. The tightening blocks 711 are slidably embedded in the tightening grooves 23, and the sliding direction of the tightening blocks 711 is parallel to the radial direction of the sealing ring 531. The tightening blocks 711 are used to tighten the outer wall of the sealing ring 531. The first reset member 712 is connected between the abutting block 711 and the valve cover 2. The first reset member 712 makes the abutting block 711 have a tendency to be embedded in the abutting groove 23. One abutting groove 23 corresponds to two first reset members 712, and the two first reset members 712 are symmetrically distributed along a direction perpendicular to the sliding direction of the abutting block 711. In this embodiment, the first reset member 712 is a spring, one end of the first reset member 712 is connected to a side surface of the abutting block 711 away from the sealing ring 531, and a receiving groove 216 is provided at the bottom of the abutting groove 23. The number of the receiving grooves 216 is the same as that of the first reset member 712 and corresponds one to one. The other end of the first reset member 712 is connected to the bottom of the receiving groove 216.

[0061] Reference Figure 5 and Figure 7, the protection mechanism 7 also includes a warning component 72. The warning component 72 includes a sliding seat 725, a moving contact piece 723, a static contact piece 722, a processor, a second reset member 724 and a light strip 721. A third annular groove 217 is provided at the upper end of the valve cover 2, and the light strip 721 is embedded in the third annular groove 217. The light strip 721 is annular. A slide groove 25 is provided at the upper cavity wall of the annular cavity 22, and the sliding seat 725 is slidably embedded in the slide groove 25. The sliding direction of the sliding seat 725 is parallel to the axial direction of the valve cover 2. The side wall of the sliding seat 725 fits with the groove wall of the slide groove 25, the moving contact piece 723 is fixedly connected to the end of the sliding seat 725 away from the annular cavity 22, the static contact piece 722 is embedded in the slide groove 25, and the static contact piece 722 is fixedly connected to the bottom of the slide groove 25. The moving contact piece 723 and the static contact piece 722 are both electrically connected to the processor, and the processor is used to control the operation of the light strip 721. The side wall of the sliding seat 725 is fixedly connected with a first embedded block 7252, and two first embedded blocks 7252 are provided, and the two first embedded blocks 7252 are symmetrically distributed along the direction perpendicular to the sliding direction of the sliding seat 725. The groove wall of the sliding groove 25 is provided with a seventh embedded groove 218, and the number of the seventh embedded grooves 218 is the same as the number of the first embedded blocks 7252 and corresponds one to one. The first embedded block 7252 is slidably embedded in the seventh embedded groove 218, and the sliding direction of the first embedded block 7252 is parallel to the sliding direction of the sliding seat 725. The number of the second reset members 724 is the same as the number of the seventh embedded grooves 218 and corresponds one to one. The second reset member 724 is connected between the first embedded block 7252 and the valve cover 2, and the second reset member 724 makes the movable contact piece 723 have a tendency to move away from the static contact piece 722. In this embodiment, the second restoring member 724 is a spring, one end of the second restoring member 724 is connected to a surface of the first embedding block 7252 away from the static contact piece 722 , and the other end of the second restoring member 724 is connected to a groove wall of the seventh embedding groove 218 close to the annular cavity 22 .

[0062] The protection mechanism 7 also includes a fixing assembly 73. The fixing assembly 73 includes a fixing rod 731 and a third reset member 732. A connecting groove 26 is provided at the groove wall of the slide groove 25 near the outer wall of the valve cover 2. The connecting groove 26 is connected to the outside. A lifting groove 219 is provided at the groove wall of the connecting groove 26 away from one end of the slide groove 25. The fixing rod 731 is slidably embedded in the connecting groove 26. The sliding direction of the fixing rod 731 is perpendicular to the sliding direction of the sliding seat 725. One end of the fixing rod 731 extends into the slide groove 25, and the other end of the fixing rod 731 extends into the lifting groove 219. A fixing groove 7251 is provided on the side wall of the sliding seat 725. The fixing groove 7251 is used for the end of the fixing rod 731 near the slide groove 25 to be embedded. The end of the fixed rod 731 close to the sliding seat 725 is provided with a first chamfer 7311, and the first chamfer 7311 is located on the side of the fixed rod 731 close to the annular cavity 22, and the first chamfer 7311 is used for the sliding seat 725 to abut. An eighth embedding groove 220 is provided at the groove wall of the connecting groove 26, and two eighth embedding grooves 220 are provided, and the two eighth embedding grooves 220 are symmetrically distributed along the direction perpendicular to the sliding direction of the fixed rod 731. The side wall of the fixed rod 731 is fixedly connected with a second embedding block 7312, and the number of the second embedding blocks 7312 is the same as the number of the eighth embedding grooves 220 and corresponds one to one. The second embedding block 7312 is slidably embedded in the eighth embedding groove 220, and the sliding direction of the second embedding block 7312 is parallel to the sliding direction of the fixed rod 731. The number of the third reset members 732 is the same as that of the second insert block 7312 and they correspond one to one. The third reset members 732 are connected between the second insert block 7312 and the valve cover 2. The third reset members 732 make the fixing rod 731 have a tendency to extend into the slide groove 25. In this embodiment, the third reset member 732 is a spring, one end of the third reset member 732 is connected to a side surface of the second insert block 7312 close to the lifting groove 219, and the other end of the third reset member 732 is connected to a side groove wall of the eighth insert groove 220 close to the lifting groove 219.

[0063] The implementation principle of a liquid hydrogen stop valve in an embodiment of the present application is as follows: before use, the ferrule plug 632 can be removed, and the air in the stop valve can be extracted and then an inert gas can be introduced to ensure dryness inside the stop valve.

[0064] When adjusting the stop valve to open or close, the hand wheel 84 is rotated to drive the screw sleeve 81 to rotate. The screw sleeve 81 is threadedly connected to the valve stem assembly 3, driving the valve stem assembly 3 to slide, driving the valve disc 4 to slide, and realizing the connection and closure of the two second channels 112 and the first channel 111.

[0065] During use, when the sealing performance of the first sealing component 51 and the second sealing component 52 decreases, the hydrogen formed by the vaporization of liquid hydrogen enters the detection hole 21, and then enters the annular cavity 22 through the air inlet channel 24. The air pressure in the annular cavity 22 increases, and the channel tightening block 711 overcomes the elastic force of the first reset member 712 and presses against the outer wall of the sealing ring 531. As the air pressure in the annular cavity 22 continues to increase, the sliding seat 725 is pushed to overcome the elastic force of the second reset member 724 to slide, and the sliding seat 725 abuts the first chamfer 7311, pushing the fixing rod 731 to slide. When the moving contact piece 723 and the static contact piece 722 are in contact, the fixing groove 7251 is aligned with the connecting hole 132. The fixing rod 731 is embedded in the fixing groove 7251 under the action of the elastic force of the third reset member 732, so that the sliding seat 725 and the valve cover 2 are relatively fixed, and the light strip 721 remains in a constant state to remind the staff to perform maintenance in time.

[0066] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A liquid hydrogen stop valve, characterized in that: The invention comprises a valve body assembly (1), a valve cover (2), a valve stem assembly (3), a valve flap (4), a first sealing assembly (51), a second sealing assembly (52) and a third sealing assembly (53); the valve body assembly (1) comprises a main body (11), an extension tube (12) and a connecting seat (13); a first channel (111) is provided at the upper end of the main body (11); two second channels (112) are provided on the inner wall of the first channel (111); the second channels (112) connect the first channel (111) with the outside; the valve flap (4) is slidably embedded in the first channel (111); the extension tube (12) is provided with a second channel (1 ... the main body (11) is provided with a first channel (111) and a second channel (112) is provided with a second channel (112) and a third sealing assembly (53); the valve body assembly (1) comprises a main body (11), an extension tube (12) and a connecting seat (13); the main body (11) is provided with a first channel (111) and a second channel (112) is provided with a second channel (112) and a third sealing assembly (53); the valve body assembly (1) comprises a main body (1 One end of the valve stem assembly (51) is connected to the upper end of the main body (11); the connecting seat (13) is connected to the other end of the extension tube (12); the valve cover (2) is connected to the connecting seat (13); one end of the valve stem assembly (3) is connected to the upper end of the valve disc (4); the first sealing assembly (51), the second sealing assembly (52) and the third sealing assembly (53) are all sleeved on the outer periphery of the valve stem assembly (3); the first sealing assembly (51) is embedded in the first channel (111); the second sealing assembly (52) is embedded in the extension tube (12); and the third sealing assembly (53) is embedded in the valve cover (2); The third sealing assembly (53) comprises a sealing ring (531) and a second Varisal ring (532); the sealing ring (531) and the second Varisal ring (532) are both sleeved on the outer circumference of the valve stem assembly (3); the outer walls of the sealing ring (531) and the second Varisal ring (532) are both tightly pressed against the inner wall of the valve cover (2); The valve cover (2) further comprises a screw plug (64); the valve cover (2) is provided with a detection hole (21); the detection hole (21) communicates with the inside of the valve cover (2) and the outside; the detection hole (21) is located on a side of the third sealing component (53) close to the connecting seat (13); the screw plug (64) is embedded in the detection hole (21); It also includes a tightening assembly (71); the tightening assembly (71) includes a tightening block (711) and a first restoring member (712); the valve cover (2) is provided with an annular cavity (22); and an inner cavity wall of the annular cavity (22) is provided with a tightening groove (23); A plurality of the abutting grooves (23) are provided, and the plurality of the abutting grooves (23) are evenly distributed in the circumferential direction around the axis of the valve cover (2); the number of the abutting blocks (711) is the same as the number of the abutting grooves (23) and corresponds one to one; The pressing block (711) is slidably embedded in the pressing groove (23); the pressing block (711) is used to press against the outer wall of the sealing ring (531); the first reset member (712) is connected between the pressing block (711) and the valve cover (2); the first reset member (712) enables the pressing block (711) to have a tendency to be embedded in the pressing groove (23); an air intake channel (24) is provided at the lower cavity wall of the annular cavity (22); the air intake channel (24) is connected to the detection hole (21); The device also comprises a warning component (72); the warning component (72) comprises a light strip (721), a stationary contact piece (722), a moving contact piece (723), a second reset piece (724) and a processor; the light strip (721) is connected to the valve cover (2); a sliding groove (25) is provided on the upper cavity wall of the annular cavity (22); the stationary contact piece (722) is embedded in the sliding groove (25); the moving contact piece (723) is slidably embedded in the sliding groove (25); the second reset piece (724) is connected between the moving contact piece (723) and the valve cover (2); the second reset piece (724) makes the moving contact piece (723) have a tendency to move away from the stationary contact piece (722); the stationary contact piece (722) and the moving contact piece (723) are electrically connected to the processor; the processor is used to control the operation of the light strip (721); The invention also comprises a sliding seat (725), a fixing rod (731) and a third reset member (732); a connecting groove (26) is provided on a side of the sliding groove (25) close to the outer wall of the valve cover (2); the connecting groove (26) is connected to the outside; the fixing rod (731) is slidably embedded in the connecting groove (26); the sliding seat (725) is connected to a side of the moving contact piece (723) away from the stationary contact piece (722); a fixing groove (7251) is provided on the side wall of the sliding seat (725); the fixing groove (7251) is used for The fixing rod (731) is embedded; a first chamfer (7311) is provided at one end of the fixing rod (731) close to the sliding seat (725); the first chamfer (7311) is located on a side of the fixing rod (731) close to the annular cavity (22); the first chamfer (7311) is used for abutment of the sliding seat (725); the third reset member (732) is connected between the fixing rod (731) and the valve cover (2); the third reset member (732) enables the fixing rod (731) to have a tendency to extend into the sliding groove (25).

2. The liquid hydrogen stop valve according to claim 1, characterized in that: It also includes a spacer ring (62); the spacer ring (62) is sleeved on the outer periphery of the valve stem assembly (3); the spacer ring (62) is embedded in the extension tube (12); the lower end of the spacer ring (62) extends into the first channel (111); and the other end of the spacer ring (62) extends into the inner side of the connecting seat (13).

3. The liquid hydrogen stop valve according to claim 2, characterized in that: The first sealing assembly (51) comprises a first universal seal ring (511); the first universal seal ring (511) is sleeved on the outer circumference of the valve stem assembly (3); the outer wall of the first universal seal ring (511) is pressed against the inner wall of the first channel (111); the second sealing assembly (52) comprises a bellows (521), a connecting piece (522) and a second sealing ring (523); the connecting piece (522) is embedded in the inner side of the connecting seat (13); a second annular groove (52211) is provided on the outer circumference of the connecting piece (522); the second sealing ring (523) is embedded in the second annular groove (52211); the outer circumference of the second sealing ring (523) is pressed against the inner wall of the connecting seat (13); one end of the connecting piece (522) extends into the spacer ring (62); the bellows (521) is sleeved on the outer circumference of the valve stem assembly (3); the upper end of the bellows (521) is connected to the lower end of the connecting piece (522).

4. The liquid hydrogen stop valve according to claim 3, characterized in that: A plurality of heat dissipation rings (131) are connected to the outer periphery of the connection seat (13); the plurality of heat dissipation rings (131) are distributed at intervals along the axial direction of the connection seat (13).

5. The liquid hydrogen stop valve according to claim 3, characterized in that: The replacement assembly (63) is also included; the connection seat (13) is provided with a connecting hole (132); the connecting hole (132) connects the inner side of the connection seat (13) with the outside; the connecting hole (132) is directly opposite to the outer wall of the spacer ring (62) extending into the inner side of the connection seat (13); the replacement assembly (63) includes a ferrule joint (631) and a ferrule plug (632); one end of the ferrule joint (631) is connected to the connection seat (13); the ferrule joint (631) is connected to the connecting hole (132); the ferrule plug (632) is connected to the end of the ferrule joint (631) away from the connection seat (13).

6. The liquid hydrogen stop valve according to claim 1, characterized in that: It also comprises a heat-insulating jacket (61); one end of the heat-insulating jacket (61) is connected to the connecting seat (13); the heat-insulating jacket (61) is sleeved on the outer circumference of the main body (11) and the extension tube (12); and a gap exists between the inner wall of the heat-insulating jacket (61) and the outer wall of the main body (11) and the extension tube (12).

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