Self-tightening sealing liquid hydrogen valve

Abstract

The invention discloses a self-tightening type sealing liquid hydrogen valve which comprises a valve body assembly, a valve rod assembly, a valve clack assembly and a valve deck. A first channel and a second channel are arranged in the lower part of the valve body assembly, a blocking part with a connecting port is arranged between the top of the inner end of the first channel and the bottom of the inner end of the second channel, and the first channel is communicated with the second channel through the connecting port; a main channel is vertically arranged in the valve body assembly, an upper channel is vertically arranged in the valve cover, the valve rod assembly penetrates through the main channel and the upper channel, a first sealing assembly set is arranged between the valve rod assembly and the main channel, and a second sealing assembly set is arranged between the valve rod assembly and the upper channel. The valve clack assembly is arranged at the bottom of the valve rod assembly, and a valve rod assembly displacement adjusting structure which enables the valve rod assembly to move upwards or downwards to the needed position and maintain the valve rod assembly at the position is arranged in the upper channel. And a self-tightening structure is arranged on the valve clack assembly. The valve has the advantages of being good in sealing performance, convenient, simple and controllable to control and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid hydrogen valves, and in particular to a self-tightening sealing liquid hydrogen valve. Background Art

[0002] A liquid hydrogen valve is a cryogenic valve that works in cryogenic gaseous hydrogen or liquid hydrogen media and is used to connect or cut off pipeline media. It needs to have extremely low temperature resistance, excellent sealing, precise operation control and other conditions to ensure the safe supply and precise control of liquid hydrogen. In particular, liquid hydrogen valves used in liquid hydrogen storage tanks and transport vehicles are in a vibrating working environment for a long time, and the safety and controllability of liquid hydrogen storage and transportation must be ensured. Therefore, it is urgent to develop a liquid hydrogen valve with good sealing performance and the ability to be easily opened and closed in a low-temperature environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a self-tightening liquid hydrogen valve with good sealing performance and convenient and simple controllable operation, and the self-tightening liquid hydrogen valve can be easily opened and closed in a low temperature environment.

[0004] In order to improve the sealing performance of the liquid hydrogen valve and enable the liquid hydrogen valve to be easily opened and closed in a low-temperature environment, the technical solution described in the present invention is: the self-tightening sealing liquid hydrogen valve comprises: a valve body assembly, a valve stem assembly, a valve disc assembly and a valve cover; a first channel and a second channel are arranged in the lower part of the valve body assembly; the outer end of the first channel passes through the outer wall of the valve body assembly to form a first opening on the outer wall of the valve body assembly; the outer end of the second channel passes through the outer wall of the valve body assembly to form a second opening on the outer wall of the valve body assembly; a blocking portion is arranged between the top of the inner end of the first channel and the bottom of the inner end of the second channel, and a connecting port is arranged on the blocking portion, and the first channel and the second channel are connected through the connecting port; a main channel is vertically arranged in the valve body assembly, the top end of the main channel passes through the top of the valve body assembly, and the bottom end of the main channel is connected with the connecting port; The valve cover is sealed and connected to the top of the valve body assembly. An upper channel is vertically arranged in the valve cover. The upper channel is communicated with the main channel, and the upper channel is coaxial with the main channel. The valve stem assembly passes through the main channel and the upper channel, a first sealing assembly group is arranged between the valve stem assembly and the main channel, and a second sealing assembly group is arranged between the valve stem assembly and the upper channel; The valve flap assembly is arranged at the bottom of the valve stem assembly, and a valve stem assembly displacement adjustment structure is arranged in the upper channel to enable the valve stem assembly to move upward or downward to a desired position and maintain the position; the valve stem assembly can be moved downward by the valve stem assembly displacement adjustment structure until the valve flap assembly is blocked on the connecting port, so that the first channel and the second channel are blocked and not connected; or the valve stem assembly can be moved upward by the valve stem assembly displacement adjustment structure until the valve flap assembly leaves the connecting port, so that the first channel and the second channel are connected; A self-tightening structure is provided on the valve flap assembly. When the valve flap assembly is blocked on the connecting port, the self-tightening structure causes the valve flap assembly to press against the connecting port with a certain pressure. The pressure can ensure that the valve flap assembly is always blocked on the connecting port and will not loosen. Once the valve flap is loosened and a gap is formed between the valve flap and the connecting port, the first channel and the second channel will be connected due to the existence of the gap, and the phenomenon of being unable to be completely cut off will occur, resulting in a leakage problem.

[0005] Further, in the aforementioned self-tightening sealing liquid hydrogen valve, the self-tightening structure is as follows: the valve flap assembly is hinged to the bottom of the valve stem assembly through a pin shaft, and a first installation space, a second installation space and a third installation space are sequentially arranged from top to bottom on the top surface of the valve flap assembly at the bottom surface of the valve stem assembly, the pressure block passes through the second installation space and the third installation space, and a limiting protrusion protruding outward and larger than the opening of the second installation space is arranged on the top of the pressure block extending above the second installation space, and a spring is sleeved on the pressure block located at the second installation space; when the valve flap assembly is blocked on the connecting port, under the action of the elastic force of the spring, the limiting protrusion abuts on the bottom surface of the valve stem assembly, and the valve flap assembly abuts on the connecting port.

[0006] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the spring is a plurality of butterfly springs, and each butterfly spring is stacked and sleeved on the pressure block.

[0007] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the bottom surface of the valve stem assembly is a spherical curved surface protruding downward, and the limiting protrusion abuts against the spherical curved surface. The cooperation between the limiting protrusion and the spherical curved surface enables the valve flap to have a self-aligning function.

[0008] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the connection port is composed of a conical channel with a bell mouth facing upward and a circular hole channel from top to bottom; the conical channel is coaxial with the circular hole channel, the upper channel, and the main channel; The valve flap assembly includes: a valve flap body, a threaded connecting rod is arranged at the bottom of the valve flap body, and a plurality of downwardly protruding protrusions are arranged on the bottom surface of the valve flap body. The valve flap seal is sleeved on the threaded connecting rod and fixed by a locking nut, and the protrusions are pressed on the valve flap seal; when the valve flap assembly is against the connecting port, the valve flap seal is in sealing contact with the inner side wall of the conical channel.

[0009] The material of the valve flap seal is a polyimide + graphite reinforced composite rod, which can ensure that the valve flap seal has high stability and wear resistance at liquid hydrogen temperature without embrittlement or performance degradation.

[0010] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the outer wall contour of the valve flap seal has a conical surface with a large upper diameter and a small lower diameter, and when the valve flap assembly rests on the connecting port, the conical surface on the valve flap seal is in close contact with the inner wall of the conical channel.

[0011] Further, in the aforementioned self-tightening sealing liquid hydrogen valve, the first sealing component group includes: a guide spacer component; The valve stem assembly is composed of a main valve stem and a connecting rod connected to the bottom of the main valve stem, the valve flap assembly is arranged at the bottom of the connecting rod, and an upper external thread section is arranged at the upper section of the connecting rod; The guide liquid barrier assembly comprises: a guide sleeve, on the top surface of which a sealing gasket installation groove, an internal thread connection hole, an elastic gasket installation groove and a lower through hole are sequentially arranged from top to bottom; a sealing gasket is placed in the sealing gasket installation groove, and an elastic gasket is placed in the elastic gasket installation groove; after the guide sleeve is screwed onto the upper external thread section through the internal thread connection hole, the guide sleeve and the bottom of the main valve stem are in sealing contact via the sealing gasket; a step is arranged on the connecting rod, the elastic gasket is stuck in the step and the elastic gasket installation groove, and the elastic gasket applies an upward force to the step and a downward force to the elastic gasket installation groove, so that the thread teeth of the internal thread connection hole and the thread teeth of the upper external thread section are more tightly engaged, thereby preventing the thread teeth of the internal thread connection hole and the thread teeth of the upper external thread section from loosening.

[0012] At least one guide ring installation groove is provided on the outer circumferential side wall of the guide sleeve, a guide ring is placed in each guide ring installation groove, each guide ring is in contact with the main channel, and a through groove is provided on the outer side wall of each guide ring for only liquefied gas to pass through.

[0013] The guide sleeve is made of UPE material, which has good plasticity and can ensure that the guide sleeve 51 can be better attached to the side wall of the main channel to prevent liquid from entering the closed cavity at the top.

[0014] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, a connector installation groove is downwardly opened at the top of the main channel, the connector is placed in the connector installation groove, and the top of the connector and the valve cover, as well as the connector and the connector installation groove are sealed by an upper sealing gasket; The top surface of the connector is provided with a heat-insulating sleeve installation groove and a lower passage for the valve stem assembly to pass through in sequence, and the heat-insulating sleeve is passed through the valve stem assembly and placed in the heat-insulating sleeve installation groove. The heat-insulating sleeve can not only play a role in heat insulation, but also play a role in straightening the valve stem assembly.

[0015] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the lower section of the valve stem assembly has a hollow closed cavity; a bellows is mounted on the valve stem assembly, the upper end of the bellows is fixedly connected to the bottom of the connector, and the lower end of the bellows is connected to the side wall of the valve stem assembly above the closed cavity; A guide heat-resistant sleeve is sleeved on the bellows and the valve stem assembly below the bellows; The valve body assembly includes an externally wrapped insulation layer and a jacket assembly.

[0016] Furthermore, in the aforementioned self-tightening sealing liquid hydrogen valve, the valve stem assembly is composed of an upper valve stem and a main valve stem, a T-shaped groove is provided at the bottom of the upper valve stem, and a T-shaped block is provided at the top of the main valve stem and is embedded in the T-shaped groove; The second sealing assembly group includes: a valve stem sealing assembly disposed between the upper valve stem and the upper channel; The displacement adjustment structure of the valve stem assembly is as follows: an external connection thread section is arranged on the upper valve stem, and an internal connection thread section is arranged at the top of the upper channel; a valve stem nut with an internal thread hole matching the external connection thread section is screwed on the external connection thread section, and the lower end of the valve stem nut is folded outward to form a lower flange, and after a thrust ball bearing and a clamping nut are inserted into the valve stem nut, the external thread section on the clamping nut is tightened with the internal connection thread section to limit the upper and lower positions of the valve stem nut, so that the valve stem nut can only rotate but cannot move up and down; A hand wheel is fixedly mounted on the valve stem nut extending out of the top of the clamping nut.

[0017] The beneficial effects of the present invention are as follows: when the liquid hydrogen valve is in a closed state, the self-tightening structure on the valve flap assembly is arranged, firstly, the spring gives a downward force to the valve flap assembly to ensure that the valve flap assembly and the connecting port can be effectively sealed, and even if they are in a vibrating condition for a long time, the two can still be well sealed; secondly, the spring gives an upward force to the valve stem assembly, and the upward force ultimately acts on the external connecting threaded section on the upper valve stem and the internal threaded hole on the valve stem nut, so that the thread teeth of the external connecting threaded section on the upper valve stem and the thread teeth of the internal threaded hole on the valve stem nut are more tightly engaged, so as to ensure that even if the liquid hydrogen valve is in a vibrating condition for a long time, the valve stem nut will not loosen, causing the valve stem assembly to move upward, thereby causing the problem of the valve not being tightly closed, which greatly improves the sealing effect of the liquid hydrogen valve when it is in a closed state, and improves the safe use performance of the liquid hydrogen valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a self-tightening sealing liquid hydrogen valve described in the present invention.

[0019] Figure 2 It is a structural schematic diagram of the valve body assembly.

[0020] Figure 3 It is a schematic diagram of the connection structure between the valve stem assembly, the valve disc, and the guide barrier assembly.

[0021] Figure 4 yes Figure 3 Schematic diagram of the local structure.

[0022] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure of part A.

[0023] Figure 6 yes Figure 1 A partial enlarged structural diagram of the upper part.

[0024] Figure 7 yes Figure 1 A partial enlarged structural diagram of the lower part. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure. In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other. Embodiment 1

[0027] like Figure 1 , Figure 2 and Figure 7As shown, a self-tightening sealing liquid hydrogen valve described in this embodiment includes: a valve body assembly 1, a valve stem assembly 2, a valve flap assembly 3 and a valve cover 4. A first channel 14 and a second channel 15 are provided in the lower part of the valve body assembly 1. The outer end of the first channel 14 passes through the outer wall of the valve body assembly 1, and a first opening 141 is formed on the outer wall of the valve body assembly 1. The outer end of the second channel 15 passes through the outer wall of the valve body assembly 1, and a second opening 151 is formed on the outer wall of the valve body assembly 1. A blocking portion 16 is provided between the top of the inner end of the first channel 14 and the bottom of the inner end of the second channel 15, and a connecting port 17 is provided on the blocking portion 16, and the first channel 14 and the second channel 15 are connected through the connecting port 17. A main channel 11 is vertically provided in the valve body assembly 1, and the top end of the main channel 11 passes through the top end of the valve body assembly 1, and the bottom end of the main channel 11 is connected to the connecting port 17.

[0028] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in this embodiment, the valve cover 4 is sealed and connected to the top of the valve body assembly 1, and the sealing connection here is a detachable fastening connection method of an upper sealing gasket 43+bolt connection assembly 42. An upper channel 41 is vertically arranged in the valve cover 4, and the upper channel 41 is connected to the main channel 11, and the upper channel 41 is coaxial with the main channel 11.

[0029] The valve stem assembly 2 passes through the main channel 11 and the upper channel 41 . A first sealing assembly group is provided between the valve stem assembly 2 and the main channel 11 , and a second sealing assembly group is provided between the valve stem assembly 2 and the upper channel 41 .

[0030] like Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, the valve flap assembly 3 is arranged at the bottom of the valve stem assembly 2, and a valve stem assembly displacement adjustment structure is provided in the upper channel 41 to enable the valve stem assembly 2 to move upward or downward to a desired position and maintain the valve stem assembly 2 at this position; the valve stem assembly 2 can be moved downward by the valve stem assembly displacement adjustment structure until the valve flap assembly 3 is blocked on the connecting port 17, so that the first channel 14 and the second channel 15 are blocked and not connected, and the liquid hydrogen valve is in a closed state at this time; or the valve stem assembly 2 can be moved upward by the valve stem assembly displacement adjustment structure until the valve flap assembly 3 leaves the connecting port 17, so that the first channel 14 and the second channel 15 are connected, and the liquid hydrogen valve is in an open state at this time.

[0031] A self-tightening structure is provided on the valve flap assembly 3 . When the valve flap assembly 3 is blocked on the connecting port 17 , the self-tightening structure causes the valve flap assembly 3 to press against the connecting port 17 with a certain pressure.

[0032] The self-tightening structure described in this embodiment is as follows: the valve flap assembly 3 is hinged to the bottom of the valve stem assembly 2 through a pin shaft 34, and a first installation space 311, a second installation space 312 and a third installation space 313 are sequentially arranged from top to bottom on the top surface of the valve flap assembly 3 at the bottom surface of the valve stem assembly 2, and the pressing block 33 passes through the second installation space 312 and the third installation space 313, and a limiting protrusion 331 protruding outward and larger than the opening of the second installation space 312 is arranged on the top of the pressing block 33 extending above the second installation space 312, and a spring is sleeved on the pressing block located at the second installation space 312.

[0033] When the valve flap assembly 3 is hinged to the bottom of the valve stem assembly 2 through a pin 34, there will inevitably be a slight gap at the hinge of the pin 34, so that the valve flap assembly 3 has an up and down fine-tuning distance. When the valve flap assembly 3 is blocked on the connecting port 17, the spring applies an upward force to the limiting protrusion 331 and a downward force to the step surface between the second installation space 312 and the third installation space 313. Under the elastic force of the spring, the limiting protrusion 331 abuts against the bottom surface of the valve stem assembly 2, and the valve flap assembly 3 abuts against the connecting port 17, so that the valve flap assembly 3 is tightly pressed against the connecting port 17.

[0034] In this embodiment, the springs are preferably a plurality of butterfly springs 32 .

[0035] like Figure 2 As shown, the connection port 17 in this embodiment is composed of a cone channel 171 with a bell mouth facing upward and a round hole channel 172 from top to bottom. The cone channel 171 and the round hole channel 172, the upper channel 41 and the main channel 11 are all coaxial.

[0036] like Figure 4 and Figure 5 As shown, the valve flap assembly 3 includes: a valve flap body 31, a threaded connecting rod 314 is arranged at the bottom of the valve flap body 31, and a plurality of downwardly protruding protrusions 315 are also arranged on the bottom surface of the valve flap body 31. The valve flap seal 35 is sleeved on the threaded connecting rod 314 and fixed by a locking nut 36, and the protrusions 315 are pressed on the valve flap seal 35; when the valve flap assembly 3 is against the connecting port 17, the valve flap seal 35 is in sealing contact with the inner wall of the conical channel 171.

[0037] A more preferred solution is that the outer wall profile of the valve flap seal 35 has a conical surface 351 with a large upper diameter and a small lower diameter. When the valve flap assembly 3 is against the connection port 17, the conical surface 351 on the valve flap seal 35 is in close contact with the inner wall of the conical channel 171. When the valve stem assembly 2 is moved downward by the valve stem assembly displacement adjustment structure to block the valve flap assembly 3 against the connection port 17, the presence of the spring causes the valve flap seal 35 to press against the inner wall of the conical channel 171 with a certain pressure, ensuring that the valve flap assembly 3 and the connection port 17 can be effectively sealed. In addition, the combination of the valve flap seal 35 and the inner wall of the conical channel 171 and the protruding points 315 makes the seal between the valve flap assembly 3 and the connection port 17 more reliable.

[0038] The valve flap seal 35 is made of a rod material reinforced with polyimide and graphite. The rod material can ensure that the valve flap seal 35 has high stability and wear resistance at liquid hydrogen temperature without embrittlement or performance degradation.

[0039] When the valve flap assembly 3 is hinged to the bottom of the valve stem assembly 2 through the pin 34, the valve flap assembly 3 also has a slight swing amplitude that can be adjusted. Therefore, in order to further improve the sealing performance between the valve flap assembly 3 and the connecting port 17, as shown in FIG. Figure 4 As shown, a more preferred solution is to set the bottom surface of the valve stem assembly 2 into a downwardly protruding spherical curved surface shape, and the limiting protrusion 331 is against the spherical curved surface 231. At this time, the valve flap assembly 3 can automatically align under the action of elastic force and has a self-aligning effect. Embodiment 2

[0040] like Figure 1 , Figure 2 and Figure 7 As shown, a self-tightening sealing liquid hydrogen valve described in this embodiment includes: a valve body assembly 1, a valve stem assembly 2, a valve flap assembly 3 and a valve cover 4. A first channel 14 and a second channel 15 are provided in the lower part of the valve body assembly 1. The outer end of the first channel 14 passes through the outer wall of the valve body assembly 1, and a first opening 141 is formed on the outer wall of the valve body assembly 1. The outer end of the second channel 15 passes through the outer wall of the valve body assembly 1, and a second opening 151 is formed on the outer wall of the valve body assembly 1. A blocking portion 16 is provided between the top of the inner end of the first channel 14 and the bottom of the inner end of the second channel 15, and a connecting port 17 is provided on the blocking portion 16, and the first channel 14 and the second channel 15 are connected through the connecting port 17. A main channel 11 is vertically provided in the valve body assembly 1, and the top end of the main channel 11 passes through the top end of the valve body assembly 1, and the bottom end of the main channel 11 is connected to the connecting port 17.

[0041] like Figure 1 , Figure 2 and Figure 7As shown, in this embodiment, the valve cover 4 is sealed and connected to the top of the valve body assembly 1, and the sealing connection here is a detachable fastening connection method of an upper sealing gasket 43+bolt connection assembly 42. An upper channel 41 is vertically arranged in the valve cover 4, and the upper channel 41 is connected to the main channel 11, and the upper channel 41 is coaxial with the main channel 11.

[0042] like Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, the valve flap assembly 3 is arranged at the bottom of the valve stem assembly 2, and a valve stem assembly displacement adjustment structure is arranged in the upper channel 41 to move the valve stem assembly 2 upward or downward to a desired position and maintain it at this position; the valve stem assembly 2 can be moved downward by the valve stem assembly displacement adjustment structure to make the valve flap assembly 3 block the connection port 17, so that the first channel 14 and the second channel 15 are blocked and not connected; or the valve stem assembly 2 can be moved upward by the valve stem assembly displacement adjustment structure to make the valve flap assembly 3 leave the connection port 17, so that the first channel 14 and the second channel 15 are connected. A self-tightening structure is arranged on the valve flap assembly 3, and when the valve flap assembly 3 is blocked on the connection port 17, the self-tightening structure makes the valve flap assembly 3 press against the connection port 17 with a certain pressure.

[0043] The valve stem assembly 2 passes through the main channel 11 and the upper channel 41 . A first sealing assembly group is provided between the valve stem assembly 2 and the main channel 11 , and a second sealing assembly group is provided between the valve stem assembly 2 and the upper channel 41 .

[0044] The first sealing component group includes: a guide liquid isolation component 5.

[0045] like Figure 3 and Figure 4 As shown, the valve stem assembly 2 is composed of a main valve stem 22 and a connecting rod 23 connected to the bottom of the main valve stem 22, wherein the lower section of the main valve stem 22 has a hollow closed cavity 222, the closed cavity 222 is provided to reduce heat transfer, and in order to facilitate the processing of the closed cavity 222, the closed cavity 222 is processed from the bottom of the main valve stem 22 upwards, and in order to close the closed cavity 222, there is a shoulder 231 on the top of the connecting rod 23 that can close the closed cavity 222, and the shoulder 231 is usually welded to close the closed cavity 222. For the convenience of description here, the lower end surface of the shoulder 231 is uniformly defined as the bottom of the main valve stem.

[0046] The valve flap assembly 3 is arranged at the bottom of the connecting rod 23, and an upper external thread section is arranged at the upper section of the connecting rod 23; Figure 4 and Figure 7As shown, the guide liquid barrier assembly 5 comprises: a guide sleeve 51, on the top surface of which a sealing gasket installation groove 511, an internal thread connection hole 512, an elastic gasket installation groove 513 and a lower through hole 514 are sequentially arranged from top to bottom. A sealing gasket 52 is placed in the sealing gasket installation groove 511, and an elastic gasket 53 is placed in the elastic gasket installation groove 513. After the guide sleeve 51 is screwed onto the upper external thread section through the internal thread connection hole, the guide sleeve 51 is in sealing contact with the bottom of the main valve stem through the sealing gasket 52.

[0047] Taking into account the difficulty of processing thread teeth with self-locking function, the upper external thread section on the connecting rod 23 and the internal thread connecting hole 512 on the guide sleeve 51 here both use easy-to-process thread teeth without self-locking function. A step 232 is provided on the connecting rod 23, and the elastic pad 53 is stuck in the step 232 and the elastic pad mounting groove 513. At this time, the elastic force of the elastic pad 53 will give a force to the connecting rod 23 and the guide sleeve 51, so that the thread teeth of the upper external thread section and the thread teeth of the internal thread connecting hole 512 are more tightly engaged, thereby ensuring that the guide sleeve 51 will not loosen easily.

[0048] The guide sleeve 51 is made of UPE material, which has good plasticity and can ensure that the guide sleeve 51 can be better attached to the side wall of the main channel 11 to prevent liquid from entering the closed cavity 222 at the top.

[0049] In this embodiment, at least one guide ring installation groove 515 is opened on the outer circumferential side wall of the guide sleeve 51, and a guide ring 54 is placed in each guide ring installation groove 515. Each guide ring 54 is in contact with the main channel 11, and a through groove is provided on the outer side wall of each guide ring 54 for only liquefied gas to pass through. Embodiment 3

[0050] like Figure 1 , Figure 2 and Figure 7As shown, a self-tightening sealing liquid hydrogen valve described in this embodiment includes: a valve body assembly 1, a valve stem assembly 2, a valve flap assembly 3 and a valve cover 4. A first channel 14 and a second channel 15 are provided in the lower part of the valve body assembly 1. The outer end of the first channel 14 passes through the outer wall of the valve body assembly 1, and a first opening 141 is formed on the outer wall of the valve body assembly 1. The outer end of the second channel 15 passes through the outer wall of the valve body assembly 1, and a second opening 151 is formed on the outer wall of the valve body assembly 1. A blocking portion 16 is provided between the top of the inner end of the first channel 14 and the bottom of the inner end of the second channel 15, and a connecting port 17 is provided on the blocking portion 16, and the first channel 14 and the second channel 15 are connected through the connecting port 17. A main channel 11 is vertically provided in the valve body assembly 1, and the top end of the main channel 11 passes through the top end of the valve body assembly 1, and the bottom end of the main channel 11 is connected to the connecting port 17.

[0051] like Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, the valve cover 4 is sealed and connected to the top of the valve body assembly 1, and the sealing connection here is a detachable fastening connection method of an upper sealing gasket 43+bolt connection assembly 42. An upper channel 41 is vertically arranged in the valve cover 4, and the upper channel 41 is connected to the main channel 11, and the upper channel 41 is coaxial with the main channel 11.

[0052] The valve stem assembly 2 passes through the main channel 11 and the upper channel 41 . A first sealing assembly group is provided between the valve stem assembly 2 and the main channel 11 , and a second sealing assembly group is provided between the valve stem assembly 2 and the upper channel 41 .

[0053] like Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, the valve flap assembly 3 is arranged at the bottom of the valve stem assembly 2, and a valve stem assembly displacement adjustment structure is provided in the upper channel 41 to enable the valve stem assembly 2 to move upward or downward to a desired position and maintain the valve stem assembly 2 at this position; the valve stem assembly 2 can be moved downward by the valve stem assembly displacement adjustment structure until the valve flap assembly 3 is blocked on the connecting port 17, so that the first channel 14 and the second channel 15 are blocked and not connected; or the valve stem assembly 2 can be moved upward by the valve stem assembly displacement adjustment structure until the valve flap assembly 3 leaves the connecting port 17, so that the first channel 14 and the second channel 15 are connected.

[0054] like Figure 1 , Figure 2 and Figure 6As shown, in this embodiment, a connector installation groove 111 is opened downward at the top of the main channel 11, and the connector 6 is placed in the connector installation groove 111. The top of the connector 6 and the valve cover 4, as well as the connector 6 and the connector installation groove 111 are sealed by an upper sealing gasket 43.

[0055] A heat-insulating sleeve installation groove 61 and a lower channel 62 for the valve stem assembly 2 to pass through are sequentially opened downward on the top surface of the connecting piece 6. The heat-insulating sleeve 7 is passed through the valve stem assembly 2 and placed in the heat-insulating sleeve installation groove 61. Because the valve stem assembly 2 is relatively long as a whole, the heat-insulating sleeve 7 can ensure concentricity and has the function of heat insulation and straightening.

[0056] The lower section of the valve stem assembly 2 has a hollow sealed cavity 222; a bellows 8 is mounted on the valve stem assembly 2, the upper end of the bellows 8 is fixedly connected to the bottom of the connecting piece 6, and the lower end of the bellows 8 is connected to the side wall of the valve stem assembly 2 above the sealed cavity 222.

[0057] The valve body assembly 1 includes an externally wrapped insulation layer 12 and a jacket assembly 13 .

[0058] like Figure 2 and Figure 6 As shown, a guide heat-resistant sleeve 9 is sleeved on the bellows 8 and the valve stem assembly 2 below the bellows 8, and a flange heat dissipation assembly 10 composed of a flange 101, a heat dissipation plate 102 and a connecting pipe 103 is arranged on the upper part of the valve body 1. The flange heat dissipation assembly 10 is usually welded to the top of the valve body assembly 1 by welding. For the convenience of description, the flange heat dissipation assembly 10 is also classified as a part of the valve body assembly 1. The heat dissipation plate 102 and the upper annular plate 131 of the jacket on the jacket assembly 13 are used to dissipate heat and prevent condensation of the liquid hydrogen valve. The guide heat-resistant sleeve 9 can reduce the gap between the valve stem assembly 2 and the flange heat dissipation assembly 10 to prevent excessive cold air from being transmitted upward.

[0059] like Figure 1 , Figure 3 and Figure 6 As shown, the valve stem assembly 2 in this embodiment is composed of an upper valve stem 21 and a main valve stem 22 , a T-shaped slot 212 is provided at the bottom of the upper valve stem 21 , and a T-shaped block 221 which is snap-fitted and connected to the T-shaped slot 212 is provided at the top of the main valve stem 22 .

[0060] The second sealing component group includes: a valve stem sealing component 60 disposed between the upper valve stem 21 and the upper channel 41. The valve stem sealing component 60 can be a combination of multiple sealing rings, which is relatively common and will not be described in detail here.

[0061] like Figure 1 , Figure 3 and Figure 6As shown, in this embodiment, the displacement adjustment structure of the valve stem assembly is as follows: an external connecting thread section 211 is provided on the upper valve stem 21, and an internal connecting thread section is provided at the top of the upper channel 41; a valve stem nut 20 with an internal thread hole matching the external connecting thread section is screwed on the external connecting thread section, and the lower end of the valve stem nut 20 is folded outward to form a lower flange 201. After the thrust ball bearing 30 and the clamping nut 40 are inserted into the valve stem nut 20, the external thread section on the clamping nut 40 is tightened with the internal connecting thread section to limit the upper and lower positions of the valve stem nut 20, so that the valve stem nut 20 can only rotate but cannot move up and down; a handwheel 50 is fixedly installed on the valve stem nut 20 extending out of the top of the clamping nut 40.

[0062] A self-tightening structure is provided on the valve flap assembly 3 . When the valve flap assembly 3 is blocked on the connecting port 17 , the self-tightening structure causes the valve flap assembly 3 to press against the connecting port 17 with a certain pressure.

[0063] The self-tightening structure described in this embodiment is as follows: the valve flap assembly 3 is hinged to the bottom of the valve stem assembly 2 through a pin shaft 34, and a first installation space 311, a second installation space 312 and a third installation space 313 are sequentially arranged from top to bottom on the top surface of the valve flap assembly 3 at the bottom surface of the valve stem assembly 2, and the pressing block 33 passes through the second installation space 312 and the third installation space 313, and a limiting protrusion 331 protruding outward and larger than the opening of the second installation space 312 is arranged on the top of the pressing block 33 extending above the second installation space 312, and a spring is sleeved on the pressing block located at the second installation space 312.

[0064] In this embodiment, the springs are preferably a plurality of butterfly springs 32 .

[0065] When the liquid hydrogen valve is in a closed state, the spring has two functions. One is to give a downward force to the valve flap assembly 3 to ensure that the valve flap assembly 3 and the connecting port 17 can be effectively sealed, even if they are in a vibrating condition for a long time, the two can still be well sealed; the other is to give an upward force to the valve stem assembly 2, which ultimately acts on the external connecting threaded section 211 on the upper valve stem 21 and the internal threaded hole on the valve stem nut 20, so that the threads of the external connecting threaded section 211 on the upper valve stem 21 and the threads of the internal threaded hole on the valve stem nut 20 are more tightly engaged, so as to ensure that even if the liquid hydrogen valve is in a vibrating condition for a long time, the valve stem nut 20 will not loosen, causing the valve stem assembly 2 to move up, resulting in the problem of the valve not being tightly closed, which greatly improves the sealing effect of the liquid hydrogen valve when it is in a closed state and improves the safe use performance of the liquid hydrogen valve.

[0066] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A self-tightening sealing liquid hydrogen valve, comprising: A valve body assembly, a valve stem assembly, a valve disc assembly and a valve cover; characterized in that: a first channel and a second channel are arranged in the lower part of the valve body assembly; the outer end of the first channel passes through the outer wall of the valve body assembly to form a first opening on the outer wall of the valve body assembly; the outer end of the second channel passes through the outer wall of the valve body assembly to form a second opening on the outer wall of the valve body assembly; a blocking portion is arranged between the top of the inner end of the first channel and the bottom of the inner end of the second channel, a connecting port is arranged on the blocking portion, and the first channel and the second channel are connected through the connecting port; a main channel is vertically arranged in the valve body assembly, the top end of the main channel passes through the top end of the valve body assembly, and the bottom end of the main channel is connected with the connecting port; The valve cover is sealed and connected to the top of the valve body assembly. An upper channel is vertically arranged in the valve cover. The upper channel is communicated with the main channel, and the upper channel is coaxial with the main channel. The valve stem assembly passes through the main channel and the upper channel, a first sealing assembly group is arranged between the valve stem assembly and the main channel, and a second sealing assembly group is arranged between the valve stem assembly and the upper channel; The valve flap assembly is arranged at the bottom of the valve stem assembly, and a valve stem assembly displacement adjustment structure is arranged in the upper channel to enable the valve stem assembly to move upward or downward to a desired position and maintain the position; the valve stem assembly can be moved downward by the valve stem assembly displacement adjustment structure until the valve flap assembly is blocked on the connecting port, so that the first channel and the second channel are blocked and not connected; or the valve stem assembly can be moved upward by the valve stem assembly displacement adjustment structure until the valve flap assembly leaves the connecting port, so that the first channel and the second channel are connected; A self-tightening structure is arranged on the valve flap assembly. When the valve flap assembly is blocked on the connection port, the self-tightening structure causes the valve flap assembly to press against the connection port with a certain pressure.

2. A self-tightening sealing liquid hydrogen valve according to claim 1, characterized in that: The self-tightening structure is as follows: the valve flap assembly is hinged to the bottom of the valve stem assembly through a pin shaft, and a first installation space, a second installation space and a third installation space are sequentially arranged from top to bottom on the top surface of the valve flap assembly at the bottom surface of the valve stem assembly, and the pressure block passes through the second installation space and the third installation space, and a limiting protrusion protruding outward and larger than the opening of the second installation space is arranged on the top of the pressure block extending above the second installation space, and a spring is sleeved on the pressure block located at the second installation space; when the valve flap assembly is blocked on the connecting port, under the elastic force of the spring, the limiting protrusion abuts on the bottom surface of the valve stem assembly, and the valve flap assembly abuts on the connecting port.

3. A self-tightening sealing liquid hydrogen valve according to claim 2, characterized in that: The springs are a plurality of butterfly springs.

4. A self-tightening sealing liquid hydrogen valve according to claim 2, characterized in that: The bottom surface of the valve stem assembly is a spherical curved surface protruding downward, and the limiting protrusion abuts against the spherical curved surface.

5. A self-tightening sealing liquid hydrogen valve according to claim 1 or 2 or 3 or 4, characterized in that: The connection port is composed of a conical channel with the bell mouth facing upward and a circular hole channel from top to bottom; The conical channel is coaxial with the circular hole channel, the upper channel and the main channel; The valve flap assembly includes: a valve flap body, a threaded connecting rod is arranged at the bottom of the valve flap body, and a plurality of downwardly protruding protrusions are arranged on the bottom surface of the valve flap body. The valve flap seal is sleeved on the threaded connecting rod and fixed by a locking nut, and the protrusions are pressed on the valve flap seal; when the valve flap assembly is against the connecting port, the valve flap seal is in sealing contact with the inner side wall of the conical channel.

6. A self-tightening sealing liquid hydrogen valve according to claim 5, characterized in that: The outer wall profile of the valve flap seal has a conical surface with a large upper diameter and a small lower diameter. When the valve flap assembly is against the connection port, the conical surface on the valve flap seal is in close contact with the inner wall of the conical channel. The valve flap seal is made of a rod material reinforced with polyimide and graphite.

7. A self-tightening sealing liquid hydrogen valve according to claim 1, characterized in that: The first sealing component group includes: a guide and spacer component; The valve stem assembly is composed of a main valve stem and a connecting rod connected to the bottom of the main valve stem, the valve flap assembly is arranged at the bottom of the connecting rod, and an upper external thread section is arranged at the upper section of the connecting rod; The guide liquid barrier assembly comprises: a guide sleeve, on the top surface of which a sealing gasket installation groove, an internal thread connection hole, an elastic gasket installation groove and a lower through hole are sequentially arranged from top to bottom; a sealing gasket is placed in the sealing gasket installation groove, and an elastic gasket is placed in the elastic gasket installation groove; after the guide sleeve is screwed onto the upper external thread section through the internal thread connection hole, the guide sleeve is in sealing contact with the bottom of the main valve stem through the sealing gasket; a step is arranged on the connecting rod, the elastic gasket is clamped in the step and the elastic gasket installation groove, and the elastic gasket is respectively against the step and the elastic gasket installation groove; At least one guide ring installation groove is provided on the outer circumferential side wall of the guide sleeve, a guide ring is placed in each guide ring installation groove, each guide ring is in contact with the main channel, and a through groove is provided on the outer side wall of each guide ring for only liquefied gas to pass through.

8. The self-tightening sealing liquid hydrogen valve according to claim 1, characterized in that: A connector installation groove is provided downwardly at the top of the main channel, the connector is placed in the connector installation groove, and the top of the connector and the valve cover as well as the connector and the connector installation groove are sealed by an upper sealing gasket; A heat-insulating sleeve installation groove and a lower passage for the valve stem assembly to pass through are sequentially opened downwardly on the top surface of the connecting piece; the heat-insulating sleeve is passed through the valve stem assembly and placed in the heat-insulating sleeve installation groove.

9. A self-tightening sealing liquid hydrogen valve according to claim 8, characterized in that: The lower section of the valve stem assembly has a hollow sealed cavity; a bellows is sleeved on the valve stem assembly, the upper end of the bellows is fixedly connected to the bottom of the connector, and the lower end of the bellows is connected to the side wall of the valve stem assembly above the sealed cavity; A guide heat-resistant sleeve is sleeved on the bellows and the valve stem assembly below the bellows; The valve body assembly includes an externally wrapped insulation layer and a jacket assembly.

10. The self-tightening sealing liquid hydrogen valve according to claim 1, characterized in that: The valve stem assembly is composed of an upper valve stem and a main valve stem, a T-shaped groove is provided at the bottom of the upper valve stem, and a T-shaped block is provided at the top of the main valve stem and is embedded in the T-shaped groove; The second sealing assembly group includes: a valve stem sealing assembly disposed between the upper valve stem and the upper channel; The displacement adjustment structure of the valve stem assembly is as follows: an external connection thread section is arranged on the upper valve stem, and an internal connection thread section is arranged at the top of the upper channel; a valve stem nut with an internal thread hole matching the external connection thread section is screwed on the external connection thread section, and the lower end of the valve stem nut is folded outward to form a lower flange, and after a thrust ball bearing and a clamping nut are inserted into the valve stem nut, the external thread section on the clamping nut is tightened with the internal connection thread section to limit the upper and lower positions of the valve stem nut, so that the valve stem nut can only rotate but cannot move up and down; A hand wheel is fixedly mounted on the valve stem nut extending out of the top of the clamping nut.

Images