Liquid hydrogen release valve

Abstract

The invention relates to a liquid hydrogen discharge valve, which belongs to the field of pressure relief and comprises a valve body and a pressure relief pipeline used for being mounted on liquid hydrogen storage equipment. A center rod; the first valve plate is connected to the bottom of the center rod and used for closing or opening the pressure relief pipeline; the piston assembly is connected to the center rod in a sleeving mode; the second valve plate is connected to the piston assembly; wherein the central rod is positioned at the end part in the pressure relief pipeline and is provided with an air inlet hole; an air outlet hole is formed in the axial wall face, located in the piston assembly, of the center rod; the piston assembly is driven by the hydrogen to have axial displacement relative to the center rod; in the first stroke, the second valve plate opens the pressure relief hole in the first valve plate; and in the second stroke, the second valve plate drives the first valve plate to be completely opened. The top of the tank body is switched between two states through the floating acting force of hydrogen, the whole structure is simple, safety and stability are high, and later maintenance is easy.

Description

Technical Field

[0001] The present invention belongs to the field of pressure relief, and particularly relates to a liquid hydrogen relief valve. Background Art

[0002] Liquid hydrogen is a dangerous good with extremely low temperature, inflammability and explosiveness. During transportation, as it absorbs heat from the outside, liquid hydrogen vaporizes and expands, and its volume gradually increases. The pressure inside the vehicle-mounted storage tank gradually rises, and the speed becomes faster and faster over time. If the pressure is not relieved in time, it is easy to cause the liquid in the tank to expand rapidly, the gas phase space to shrink sharply, the pressure in the tank to rise rapidly, and the liquid to fill the entire tank body, bringing great potential safety hazards.

[0003] In the existing technical solutions, a pressure relief valve is usually used to relieve the pressure of hydrogen in the storage tank. A spring structure is provided inside the pressure relief valve. The spring structure can be adapted when dealing with normal temperature media, but when facing low temperature media such as liquid hydrogen, the spring structure is affected by the low temperature, the brittleness of its own structure increases, resulting in a decrease in its toughness, and it is easy to break, causing the valve body to fail and prone to safety accidents. Even if the spring structure does not break, under the influence of low temperature media, the spring life and elastic deformation ability will also be affected, presenting potential safety hazards. Summary of the Invention

[0004] To solve the above-mentioned problems in the prior art, the present invention provides a liquid hydrogen relief valve.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A liquid hydrogen relief valve is provided, which is characterized by comprising:

[0007] A valve body for being installed on the pressure relief pipeline of the liquid hydrogen storage device, the valve body comprising:

[0008] A central rod;

[0009] A first valve piece connected to the bottom of the central rod for closing or opening the pressure relief pipeline;

[0010] A piston assembly sleeved on the central rod;

[0011] A second valve piece connected to the piston assembly;

[0012] Wherein, an end of the central rod located inside the pressure relief pipeline has an air inlet hole;

[0013] Wherein, an axial wall surface of the central rod located inside the piston assembly is provided with an air outlet hole;

[0014] The piston assembly is controlled by the drive of hydrogen to have an axial displacement relative to the central rod;

[0015] Moreover, in the first stroke, the second valve plate opens the pressure relief hole on the first valve plate;

[0016] Moreover, in the second stroke, the second valve plate drives the first valve plate to open completely.

[0017] Preferably, the piston assembly includes:

[0018] A piston sleeve, which is in clearance fit with the central rod;

[0019] Wherein, the clearance between the two is for the flow of hydrogen;

[0020] Wherein, the second valve plate is connected to the piston sleeve;

[0021] A piston cavity, which is connected to the central rod;

[0022] A piston disk, which is slidably connected to the piston cavity and is connected to the piston sleeve;

[0023] Wherein, hydrogen enters the interior of the piston cavity and pushes the piston disk to drive the piston sleeve to axially displace relative to the center.

[0024] Preferably, the central rod includes:

[0025] A coupling end and a ventilation end;

[0026] The ventilation end has the intake hole, and the ventilation end is located in the pressure relief pipeline;

[0027] Wherein, the first valve plate is slidably sleeved on the circumferential wall surface of the ventilation end;

[0028] The coupling end has the air outlet hole, and the coupling end is located in the piston cavity.

[0029] Preferably, the first valve plate is slidably sleeved on the axial wall surface of the ventilation end through an elastic member;

[0030] Moreover, the elastic member exerts an elastic force F on the first valve plate;

[0031] The direction of the elastic force F is towards the direction of the pressure relief pipeline;

[0032] Moreover, the elastic force F is less than the acting force exerted by the second valve plate on the first valve plate.

[0033] Preferably, the second valve plate includes:

[0034] A plate body and a valve stem;

[0035] The plate body is connected to the piston sleeve;

[0036] Wherein, the valve stem is arranged on the end face of the sheet body facing the first valve disc;

[0037] And, the valve stem passes through the pressure relief hole of the first valve disc.

[0038] Preferably, the valve stem has a conical structure, and a stop block is arranged at the end of the valve stem;

[0039] The diameter of the stop block is larger than the diameter of the pressure relief hole.

[0040] Preferably, between the bottom end of the valve body and the pressure relief pipeline, there is also arranged:

[0041] A gas coupling pipe, the end parts of which are respectively connected to the first valve disc and the pressure relief pipeline;

[0042] Wherein, a shallow groove is arranged at the end part of the gas coupling pipe, and a convex block is arranged at the corresponding position of the bottom edge of the first valve disc to be hermetically connected with the shallow groove.

[0043] Preferably, at the end part of the gas coupling pipe, there is also arranged:

[0044] A sliding assembly, and the first valve disc is slidably connected to the gas coupling pipe through the sliding assembly;

[0045] Wherein, the sliding assembly includes:

[0046] A sliding member and a sliding groove for its sliding connection;

[0047] Wherein, the sliding member is arranged at the bottom of the first valve disc;

[0048] Wherein, the sliding groove is arranged at the top of the gas coupling pipe and is adapted to the setting position of the sliding member.

[0049] Preferably, the sliding assembly is also provided with:

[0050] A limit block, which is arranged in the sliding groove, and is used to limit the sliding of the sliding member when the first valve disc moves away from the side of the top of the gas coupling pipe;

[0051] Wherein, the sliding member is provided with an extending structure with a certain length in the moving direction of the first valve disc, and the extending structure facilitates the first valve disc to be completely separated from the top of the gas coupling pipe under the action of hydrogen floating and then be coupled again through sliding.

[0052] Preferably, between the sheet body and the valve stem, there is arranged:

[0053] A protrusion, the shape and size of which are adapted to the shape and size of the pressure relief hole;

[0054] Wherein, after the sheet body is coupled with the first valve sheet, the protrusion can cover and seal the top of the pressure relief hole.

[0055] The present invention provides a liquid hydrogen relief valve. The beneficial effects of the present invention are as follows: Compared with the prior art, in the traditional pressure relief valve structure, a spring structure is provided inside. When dealing with cryogenic media such as liquid hydrogen, the spring is easily affected by the cryogenic media, resulting in an increase in its brittleness and prone to fracture, leading to the failure of the valve body. The present invention removes the spring structure and utilizes the characteristic that hydrogen has a relatively small density and floats upward. Through the setting of the piston assembly, hydrogen enters the piston cavity and pushes the piston disk and the piston sleeve to slide upward along the central rod, thereby driving the second valve sheet to move synchronously. The valve rod of the second valve sheet can open the pressure relief hole of the first valve sheet or completely separate the first valve sheet from the gas coupling pipe, facilitating exhaust and pressure relief. The setting of the sliding assembly and the central rod can ensure that after the first valve sheet is opened, when the external force disappears or weakens, it can return to the initial position to cover the gas coupling pipe again. The overall structure is relatively simple, with high safety and stability, and easy later maintenance. Brief Description of the Drawings

[0056] Figure 1 is the front view of the liquid hydrogen relief valve proposed by the present invention;

[0057] Figure 2 is the left sectional view of the liquid hydrogen relief valve proposed by the present invention;

[0058] Figure 3 is Figure 2 the enlarged sectional view of the liquid hydrogen relief valve proposed by the present invention as shown;

[0059] Figure 4 is the bottom view of the liquid hydrogen relief valve proposed by the present invention;

[0060] Figure 5 is the internal view of the valve body of the liquid hydrogen relief valve proposed by the present invention;

[0061] Figure 6 is the connection diagram of the piston sleeve of the liquid hydrogen relief valve proposed by the present invention;

[0062] Figure 7 is the diagram of the first valve sheet and the second valve sheet of the liquid hydrogen relief valve proposed by the present invention;

[0063] Figure 8 is the diagram of the central rod of the liquid hydrogen relief valve proposed by the present invention;

[0064] Figure 9 is the diagram of the central rod and the piston cavity of the liquid hydrogen relief valve proposed by the present invention;

[0065] Figure 10Schematic diagram of the connection between the sliding assembly of the liquid hydrogen relief valve proposed by the present invention and the gas coupling pipe;

[0066] Figure 11 Enlarged view of the sliding assembly of the liquid hydrogen relief valve proposed by the present invention.

[0067] Explanation of reference numerals:

[0068] 1. Valve body; 101. Central rod; 102. First valve plate; 103. Piston assembly; 104. Second valve plate; 105. Air inlet hole; 106. Air outlet hole; 107. Pressure relief hole; 108. Piston sleeve; 109. Piston cavity; 110. Piston disc; 111. Coupling end; 112. Venting end; 113. Elastic member; 114. Sheet body; 115. Valve rod; 116. Block; 117. Gas coupling pipe; 118. Annular shallow groove; 119. Protrusion; 120. Sliding assembly; 121. Sliding member; 122. Sliding groove; 123. Limiting block; 124. Extension structure; 125. Protrusion. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0070] Please refer to Figures 1 - 11 as shown, the specific embodiments provided by the present invention are as follows:

[0071] The boiling point of liquid hydrogen is extremely low. Even in a well-insulated storage tank, it will evaporate into hydrogen due to heat infiltration, resulting in pressure rise. The existence of evaporated hydrogen from liquid hydrogen brings a series of problems and challenges. First, the evaporated gas accumulated in the liquid hydrogen storage tank will cause a rapid rise in the internal pressure of the storage tank, increasing the safety risk of the system. Discharging the evaporated gas in the liquid hydrogen storage tank is an effective means to ensure the safety of the liquid hydrogen storage tank. However, if the evaporated gas of liquid hydrogen is released into the environment without control, considering the flammability and explosiveness of hydrogen, there will be a huge hidden danger to the surrounding environment and the safety of people's lives and property. In addition, considering dangerous situations such as fires, when the temperature and pressure of the high-pressure hydrogen container rise abnormally, it is easy to cause accidents such as container rupture;

[0072] Common liquid hydrogen storage tanks control the discharge of hydrogen through pressure relief valves. Springs are provided inside common pressure relief valves. Hydrogen floats up and pushes the spring upward, thus opening the valve of valve body 1 to discharge hydrogen. However, since the hydrogen generated by liquid hydrogen has a relatively low temperature, transferring the low-temperature medium will increase the brittleness of the spring material. The increased brittleness may cause the spring to undergo brittle fracture when subjected to impact or vibration. The fractured spring will cause the entire valve body 1 to lose control of hydrogen, resulting in the hydrogen discharge being in a free and uncontrolled state. Moreover, hydrogen has a relatively low density, and once it diffuses, it is very easy to trigger a fire or explosion.

[0073] Hydrogen, as the gas with the lowest known density, is very easy to diffuse. Therefore, it is necessary to control its discharge. There is an opening at the top of the pressure relief pipeline. Valve body 1 is arranged at the opening. The pressure relief pipeline is provided with a support frame. The shape and size of the support frame are adapted to the shape and size of valve body 1 for clamping and fixing it. Valve body 1 and the support frame are fixed by means of clamping, which is convenient for replacing valve body 1. The number of valve bodies 1 can be set in multiple groups to connect with multiple pressure relief pipelines. The multiple groups of valve bodies 1 are convenient for other valve bodies 1 to still work normally when one of the valve bodies 1 fails, ensuring that the pressure in the liquid hydrogen storage device does not exceed the safety limit. In some cases, a single valve body 1 may not be able to meet the flow demand for rapid pressure relief. Multiple valve bodies 1 can work simultaneously to ensure that a large amount of gas can be quickly released in an emergency.

[0074] A fixing block is arranged at the top of valve body 1. One end of the central rod 101 is connected to the fixing block, and the other end extends into the pressure relief pipeline. The central rod 101 includes a fixing part at the top and a gas part at the bottom that communicates with the inside of the pressure relief pipeline. The air inlet hole 105 is arranged at the bottom end of the gas part. The gas channel is located inside the gas part. The air inlet hole 105 allows the hydrogen generated in the pressure relief pipeline to enter and enter the piston cavity 109 through the gas channel. The shape of the air inlet hole 105 is conical to facilitate the entry of hydrogen.

[0075] Furthermore, when hydrogen enters the piston cavity 109, it drives the piston disk 110 and the piston sleeve 108 to slide linearly along the direction of the central rod 101. When the upward floating force of hydrogen disappears or the acting force is less than a specific value, the piston disk 110 and the piston sleeve 108 return to the initial position under their own gravity.

[0076] An installation space is provided inside valve body 1 for placing the piston assembly 103 and the central rod 101. The piston assembly 103 is sleeved on the central rod 101. The piston assembly 103 includes a piston cavity 109 arranged near the top of valve body 1, a piston disk 110 slidably connected inside the piston cavity 109, and a piston sleeve 108 connected to the bottom thereof. The bottom of the piston sleeve 108 is fixedly connected to the second valve plate 104 as a whole.

[0077] The space formed within the piston cavity 109 allows the piston disk 110 to slide along the direction of the central rod 101. The piston disk 110 and the piston sleeve 108 are of an integrally formed structure or are fixed by welding or plugging. Hydrogen can enter through the intake hole 105, pass through the interior of the rod body, and be discharged from the outlet hole 106 into the piston cavity 109;

[0078] Part of the structure of the piston sleeve 108 is located within the piston cavity 109. The piston sleeve 108 is provided with a breathable opening adapted to the outlet hole 106 for hydrogen to pass through. Both ends of the piston sleeve 108 are hermetically connected to the second valve plate 104 and the piston cavity 109 to prevent hydrogen from leaking through the gaps and affecting the entry of hydrogen into the piston cavity 109. The diameter of the piston sleeve 108 is slightly larger than the diameter of the central rod 101;

[0079] A gas coupling pipe 117 is provided between the first valve plate 102 and the pressure relief pipe. The gas coupling pipe 117, as a connecting pipe, can fix the valve body 1 and the pressure relief pipe as a whole. The setting of the gas coupling pipe 117 will not affect the hydrogen discharge of the pressure relief pipe and only serves as a coupling structure to fix the above two structures. The number of pressure relief holes 107 on the first valve plate 102 is set in multiple groups to facilitate exhaust. When the first valve plate 102 is completely separated from the top of the gas coupling pipe 117, the hydrogen can be discharged and the pressure can be relieved relatively quickly;

[0080] The second valve plate 104 includes a plate body 114 and a valve stem 115. The top of the plate body 114 is coupled to the bottom structure of the piston sleeve 108, and the two are fixed by welding or plugging. The number of valve stems 115 can be set in multiple groups. Multiple connection grooves are provided at the corresponding positions at the bottom of the plate body 114 to connect with the ends of the valve stems 115. At least part of the structure of the valve stem 115 passes through the pressure relief hole 107 and is inside the gas coupling pipe 117. Moreover, the diameter of the structure of the valve stem 115 located within the pressure relief hole 107 is smaller than the diameter of the pressure relief hole 107 to allow hydrogen to overflow through the gap between the two. The stop block 116 is located within the gas coupling pipe 117 to connect with the end of the valve stem 115, and the two are fixed by welding;

[0081] Specifically, as the amount of hydrogen entering the piston cavity 109 increases, under the buoyancy force of hydrogen, the piston disc 110, the piston sleeve 108 and the second valve plate 104 slide linearly along the center rod 101 toward the top of the valve body 1. At this time, the valve stem 115 located in the gas coupling tube 117 moves synchronously, and the pressure relief hole 107 opens to allow hydrogen to overflow for pressure relief. When the amount of hydrogen entering the piston cavity 109 continues to increase, the valve stem 115 continues to move. At this time, the stopper 116 will be blocked by the pressure relief hole 107 because its own diameter is larger than the diameter of the pressure relief hole 107. 07 stop, the upward force of hydrogen will drive the stopper 116 to apply an external force to the first valve plate 102 away from the gas coupling tube 117. When the external force exceeds the coupling force between the two, the first valve plate 102 is completely separated from the gas coupling tube 117. When the hydrogen is discharged and the pressure is reduced to a specific value, the piston assembly 103 and the second valve plate 104 move toward the top side of the gas coupling tube 117 as a whole under the action of gravity, and the second valve plate 104 covers the pressure relief hole 107, and the first valve plate 102 covers the gas coupling tube 117 again.

[0082] The present invention automatically switches the top of the pressure relief pipe between two states according to the amount of hydrogen entering the piston cavity 109. The first state refers to that the hydrogen pressure drives the second valve plate 104 to slide away from the first valve plate 102, and the valve stem 115 opens the pressure relief hole 107 for hydrogen discharge and pressure relief. At this time, the hydrogen pressure is not enough to drive the stopper 116 to separate the first valve plate 102 from the gas coupling pipe 117; the second state refers to that the hydrogen pressure belt slides the second valve plate 104, and the valve stem 115 opens the pressure relief hole 107 for hydrogen discharge and pressure relief, but the weakened pressure or the initial pressure is greater than the force between the first valve plate 102 and the gas coupling pipe 117. At this time, the stopper 116 completely pulls up the first valve plate 102 and separates it from the pressure relief pipe to exhaust and relieve pressure. The pressure relief method set in this way is safe and efficient, and avoids the occurrence of overcooling or ultra-low pressure phenomenon of the pressure relief pipe caused by excessive single pressure relief. The overall service life of the structure is long, the pressure response speed is high, and the later maintenance cost is low.

[0083] like Figures 1 to 6 As shown, the second embodiment of the present invention provides a liquid hydrogen discharge valve, and a guide ring is further provided between the piston sleeve 108 and the center rod 101. The guide ring is used to provide precise guidance to prevent the piston sleeve 108 from tilting, and the stability is better.

[0084] The shape of the piston cavity 109 is adapted to the shape of the piston disc 110. The inner wall of the piston cavity 109 is a smooth structure. The side wall of the piston disc 110 can be slidably connected to the piston cavity 109. A sealing ring is provided between the inner wall of the piston cavity 109 and the edge structure of the piston disc 110. The setting of the sealing ring will not affect the sliding of the piston disc 110 and will not cause the hydrogen gas entering the piston cavity 109 to overflow from the connection gap between the two to the top of the piston disc 110, thus affecting the upward sliding of the piston disc 110 under the action of hydrogen gas. The inner wall of the piston cavity 109 is provided with an anti-static coating to avoid the generation and accumulation of static electricity;

[0085] The diameter of the piston sleeve 108 is slightly larger than the rod diameter of the central rod 101. An inwardly recessed clamping groove is provided at the top position of the piston sleeve 108. A circular hole is provided at the center of the piston disc 110. The circular hole can be connected to the clamping groove. The clamping groove can fix the piston disc 110. A connecting piece is provided at the bottom of the piston sleeve 108. The connecting piece can be connected to the second valve piece 104. A sealing member is provided at the connecting piece to seal the gap to prevent hydrogen gas from overflowing from the gap, thus affecting the entry of gas into the piston cavity 109.

[0086] As Figures 1 to 9 shown, the third embodiment of the present invention proposes a liquid hydrogen relief valve. The central rod 101 is the core of the overall structure. On the one hand, it can support the piston assembly 103 to slide on the rod body. On the other hand, it can transport the hydrogen gas overflowing from the top of the pressure relief pipeline into the piston cavity 109;

[0087] The valve body 1 is provided with a clamping groove at the structure corresponding to the end of the coupling end 111. The clamping groove can clamp the coupling end 111 and can ensure that it is vertically arranged at the top of the pressure relief pipeline. The vertically arranged central rod 101 can make the sliding of the piston assembly 103 on the rod body more stable, avoiding tilting and thus affecting the switching between the two states of the top of the pressure relief pipeline. The central rod 101 is generally cylindrical, and the structural stability is better. The number of air outlet holes 106 on the coupling end 111 can be set in multiple groups and arranged around the coupling end 111 so that hydrogen gas can enter the piston cavity 109 evenly;

[0088] The ventilation end 112 is used as a gas transportation structure and is internally provided with a gas channel. The hydrogen gas located in the pressure relief pipeline enters from the air inlet hole 105 and is discharged into the piston cavity 109 from the air outlet hole 106 through the gas channel. A clamping groove is provided at the corresponding position at the top of the second valve piece 104. A part of the structure at the bottom of the piston sleeve 108 can enter the clamping groove, and the two form a sealed connection.

[0089] As Figures 1 to 5As shown in the figure, the fourth embodiment of the present invention proposes a liquid hydrogen relief valve. A channel is provided at the position of the first valve plate 102 corresponding to the central rod 101. The channel is for the ventilation end 112 to pass through, so that part of its structure is located in the pressure relief pipeline, thereby facilitating hydrogen to enter from the intake hole 105 at the bottom of the ventilation end 112. The diameter of the channel is slightly larger than the diameter of the rod body of the central rod 101, and the annular gap formed between the two is for placing the elastic member 113;

[0090] The elastic member 113 can apply an external force to the first valve plate 102 in the direction towards the pressure relief pipeline, so that the first valve plate 102 is pressed tightly against the pressure relief pipeline, and the external force is less than the external force applied by the second valve plate 104 to the first valve plate 102. The function is that it will not affect the switching of the first valve plate 102 between the two states by the second valve plate 104.

[0091] As Figures 2 to 7 shown in the figure, the fifth embodiment of the present invention proposes a liquid hydrogen relief valve. The sheet body 114 is provided with a card slot for connecting with the piston sleeve 108. The size of the first valve plate 102 is slightly larger than that of the sheet body 114. An annular groove is provided at the corresponding position on the top of the first valve plate 102. The size and shape of the annular groove are adapted to the size and shape of the sheet body 114. Part of the structure of the sheet body 114 enters the annular groove to cover and seal the top of the first valve plate 102;

[0092] A plurality of connecting grooves are provided at the bottom of the sheet body 114. The end of the valve rod 115 can be connected with the connecting grooves, and the two are fixed by means of clamping or threaded connection. The number of valve rods 115 at the bottom of the sheet body 114 can be set in multiple groups to facilitate the control of the opening and closing of the first valve plate 102. The valve rod 115 can pass through the pressure relief hole 107 so that part of its structure is located in the pressure relief pipeline. Among them, the diameter of the structure of the valve rod 115 located in the pressure relief hole 107 is smaller than the hole diameter of the pressure relief hole 107. The purpose of such a setting is that when the second valve plate 104 moves away from the pressure relief pipeline side under the action of hydrogen, the valve rod 115 moves synchronously. At this time, the sheet body 114 is separated from the first valve plate 102, and the gap formed between the valve rod 115 and the pressure relief hole 107 can allow hydrogen to be discharged. The whole valve rod 115 is made of a low-temperature resistant material to avoid the low temperature affecting its structural strength.

[0093] As Figures 3 to 7As shown in the figure, the sixth embodiment of the present invention proposes a liquid hydrogen relief valve. The stopper 116 and the valve stem 115 are integrally formed or fixed by welding. The main function of the stopper 116 is to separate the first valve plate 102 from the top of the pressure relief pipeline, so as to quickly discharge the hydrogen in the pressure relief pipeline. At least part of the structure of the stopper 116 is blocked by the pressure relief hole 107 when the second valve plate 104 moves away from the pressure relief pipeline as a whole. At this time, if the upward buoyancy force of hydrogen is less than or equal to the force between the first valve plate 102 and the top of the pressure relief pipeline, the first valve plate 102 still covers the top of the pressure relief pipeline. When the amount of hydrogen continues to increase and the upward buoyancy force of hydrogen is greater than the force between the first valve plate 102 and the top of the pressure relief pipeline, the stopper 116 will pull up the first valve plate 102 as a whole and move it away from the top of the pressure relief pipeline, so as to completely open the top of the pressure relief pipeline and quickly exhaust gas. Among them, the force between the first valve plate 102 and the top of the pressure relief pipeline is the coupled force of the two, including but not limited to frictional force, air pressure, etc.

[0094] As Figures 2 to 10 shown in the figure, the seventh embodiment of the present invention proposes a liquid hydrogen relief valve. The gas coupling pipe 117 is used to connect the valve body 1 and the pressure relief pipeline, and sealing structures are provided at the connection parts. The sealing structures include but are not limited to gaskets, sealing rings, etc. The sealing structures can seal the connection gaps to prevent hydrogen from overflowing and causing potential safety hazards.

[0095] The shallow groove 118 has a certain depth, and the depth is consistent with the height of the convex block 119. The whole convex block 119 can enter the shallow groove 118, so as to cover and seal the first valve plate 102 and the gas coupling pipe 117. A gasket is provided on the inner wall of the shallow groove 118. On the one hand, the gasket can further improve the sealing performance of the overall structure after the two are coupled. On the other hand, the setting of the gasket will not affect the separation or coupling of the two.

[0096] Multiple groups of the convex block 119 and the shallow groove 118 can be arranged circumferentially along the pipe orifice of the gas coupling pipe 117. The convex block 119 and the shallow groove 118 are integrally arranged in a conical shape. The direction of the conical setting is that the cross section gradually decreases from the side of the gas coupling pipe 117 where the first valve plate 102 is located to the side of the pressure relief pipeline. The conically arranged convex block 119 and shallow groove 118 can further improve the sealing performance of the overall structure, and thus improve the accuracy of the piston cavity 109's response to hydrogen.

[0097] As Figures 10 to 11 shown in the figure, the eighth embodiment of the present invention proposes a liquid hydrogen relief valve. The sliding assembly 120 is provided to facilitate the coupling or separation of the first valve plate 102 and the top of the gas coupling pipe 117. The sliding groove 122 is arranged from the top of the gas coupling pipe 117 to the side of the pressure relief pipeline. The number of sliding grooves 122 is adapted to the number of sliding parts 121:

[0098] The structure of the first valve plate 102 located on one side of the top of the gas coupling pipe 117 is provided with a U-shaped clamping groove. At least part of the structure of the sliding member 121 can enter the U-shaped clamping groove to form a coupling. A plurality of coupling holes are provided on the side of the U-shaped clamping groove. The coupling holes are for the threaded rod or the insertion rod to pass through to fix the first valve plate 102 and the sliding member 121 as a whole;

[0099] The sliding groove 122 is arranged on the inner wall of the top opening of the gas coupling pipe 117. The inner wall is provided with a groove structure for placing the sliding groove 122. The groove structure is provided with a plurality of insertion rods for fixing the sliding groove 122. Specifically, the slidably arranged first valve plate 102 is separated from the top of the gas coupling pipe 117 under the action of the stop block 116. When the external force of hydrogen disappears or weakens to a certain specific value, due to the existence of the sliding assembly 120, the first valve plate 102 can return to the initial position, not completely relying on the positioning and guiding of the central rod 101, and the movement of the first valve plate 102 is relatively stable.

[0100] As Figures 10 to 11 shown, the ninth embodiment of the present invention proposes a liquid hydrogen relief valve. A plurality of slots are arranged on the groove body of the sliding groove 122. The arrangement of the slots will not affect the sliding of the sliding member 121. The limit block 123 is inserted into the slots at different positions, thereby restricting the sliding distance of the sliding member 121. At least part of the structure of the limit block 123 serves as a blocking section for limiting the sliding of the sliding member 121;

[0101] When the first valve plate 102 moves away from the top of the gas coupling pipe 117 under the action of hydrogen, theoretically, the moving distance of the first valve plate 102 away from the top of the gas coupling pipe 117 has a limit distance, or is limited by the volume of the valve body 1 or the peak pressure of hydrogen, etc. When the first valve plate 102 reaches the farthest distance, the outermost end of the extension structure 124 is blocked by the limit block 123. When the upward floating force of hydrogen decreases or disappears, due to the existence of the extension structure 124 and the action of gravity, the sliding member 121 will slide along the direction of the sliding groove 122, thereby transporting the first valve plate 102 to a specific position, where the specific position includes the initial position;

[0102] The arrangement of the extension structure 124 facilitates the first valve plate 102 to return to the initial position when the hydrogen pressure disappears. Moreover, the sliding method can prevent the first valve plate 102 from shifting, so that it can complete the reset along the predetermined position. After the reset, the first valve plate 102 can cover and seal the top of the gas coupling pipe 117 again. The advantage of the reset is to improve the response accuracy and sensitivity of the overall valve body 1 to the change of hydrogen pressure.

[0103] As Figure 2As shown, the tenth embodiment of the present invention proposes a liquid hydrogen relief valve. The shape and size of the protrusion 125 are adapted to the shape and size of the pressure relief hole 107. The function of this setting is that the protrusion 125 can cover the pressure relief hole 107 from the top. Specifically, when the second valve plate 104 moves away from the first valve plate 102 under the action of hydrogen, the protrusion 125 is separated from the pressure relief hole 107, thereby opening the pressure relief hole 107. Hydrogen overflows from the gap between the pressure relief hole 107 and the valve stem 115, and then is discharged from the exhaust air duct of the valve body 1. When the hydrogen pressure decreases or disappears, the second valve plate 104 abuts against the first valve plate 102 again under the action of gravity, and at least part of the structure of the protrusion 125 can enter the pressure relief hole 107, thereby assisting the second valve plate 104 to cover and seal the pressure relief hole 107.

[0104] The exhaust air duct of the valve body 1 is used to discharge the hydrogen overflowing from the top of the gas coupling pipe 117. The exhaust air duct can be conical, which is convenient for better discharging hydrogen, effectively guiding the air flow, reducing the resistance and turbulence of the air flow in the duct, thereby improving the exhaust efficiency and avoiding gas backflow. The exhaust duct is a smooth structure to facilitate the discharge of hydrogen.

[0105] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top part", "bottom part", "inner", "outer", "inner side", "outer side", etc.

[0106] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "linkage", "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0107] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0108] In the description of the embodiments of the present invention, it should be understood that "-" and "~" represent the range between two numerical values, and this range includes the endpoints. For example: "A - B" represents a range greater than or equal to A and less than or equal to B. "A ~ B" represents a range greater than or equal to A and less than or equal to B.

[0109] In the description of the embodiments of the present invention, the term "and / or" herein is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0110] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid hydrogen relief valve for liquid hydrogen storage equipment, characterized in that, Comprising: A valve body for installation to the pressure relief pipeline of the liquid hydrogen storage device, the valve body comprising; A central rod; A first valve disc connected to the bottom of the central rod for closing or opening the pressure relief pipeline; A piston assembly sleeved on the central rod; A second valve disc connected to the piston assembly; Wherein, the end of the central rod located inside the pressure relief pipeline has an air inlet hole; Wherein, an air outlet hole is provided on the axial wall surface of the central rod located inside the piston assembly; The piston assembly is controlled by the drive of hydrogen to have an axial displacement relative to the central rod; And, in the first stroke, the second valve disc opens the pressure relief hole on the first valve disc; And, in the second stroke, the second valve disc drives the first valve disc to open completely.

2. The liquid hydrogen relief valve according to claim 1, wherein The piston assembly includes: A piston sleeve in clearance fit with the central rod; Wherein, the clearance between the two is for the flow of hydrogen; Wherein, the second valve disc is connected to the piston sleeve; A piston cavity connected to the central rod; A piston disc slidably connected to the piston cavity and connected to the piston sleeve; Wherein, hydrogen enters the interior of the piston cavity and pushes the piston disc to drive the piston sleeve to have an axial displacement relative to the center.

3. The liquid hydrogen relief valve according to claim 2, wherein, The central rod includes: A coupling end and a ventilation end; The ventilation end has the air inlet hole, and the ventilation end is located in the pressure relief pipeline; Wherein, the first valve disc is slidably sleeved on the circumferential wall surface of the ventilation end; The coupling end has the air outlet hole, and the coupling end is located inside the piston cavity.

4. The liquid hydrogen relief valve according to claim 3, wherein The first valve disc is slidably sleeved on the axial wall surface of the ventilation end through an elastic member; And, the elastic member exerts an elastic force F on the first valve disc; The direction of the elastic force F is the direction pointing to the pressure relief pipeline; And, the elastic force F is less than the force exerted by the second valve disc on the first valve disc.

5. The liquid hydrogen relief valve according to claim 2, characterized in that, The second valve disc includes: A disc body and a valve stem; The disc body is connected to the piston sleeve; Wherein, the valve stem is provided on the end face of the disc body facing the first valve disc; And, the valve stem passes through the pressure relief hole of the first valve disc.

6. The liquid hydrogen relief valve according to claim 5, wherein The valve stem has a conical structure, and a stop block is provided at the end of the valve stem; The diameter of the stop block is larger than the diameter of the pressure relief hole.

7. The liquid hydrogen relief valve according to claim 1, characterized in that, Between the bottom end of the valve body and the pressure relief pipeline, there is also provided: A gas coupling pipe, the ends of which are respectively connected to the first valve disc and the pressure relief pipeline; Wherein, a shallow groove is provided at the end of the gas coupling pipe, and a convex block is provided at the corresponding position of the bottom edge of the first valve disc to be hermetically connected to the shallow groove.

8. The liquid hydrogen relief valve according to claim 7, characterized in that At the end of the gas coupling pipe, there is also provided: A sliding assembly, and the first valve disc is slidably connected to the gas coupling pipe through the sliding assembly; Wherein, the sliding assembly includes: A sliding member and a sliding groove for its sliding connection; Wherein, the sliding member is provided at the bottom of the first valve disc; Wherein, the sliding groove is provided at the top of the gas coupling pipe to be adapted to the setting position of the sliding member.

9. The liquid hydrogen relief valve according to claim 8, characterized in that, The sliding assembly is also provided with: The limiting block is arranged in the sliding groove. When the first valve plate moves away from one side of the top of the gas coupling pipe, the limiting block is used to limit the sliding of the sliding part. Wherein, the sliding part is provided with an extending structure with a certain length in the moving direction of the first valve plate. The extending structure facilitates the first valve plate to be completely separated from the top of the gas coupling pipe under the action of hydrogen floating and then be coupled again by sliding.

10. The liquid hydrogen relief valve according to claim 5, characterized in that, There is provided between the sheet body and the valve stem: A protrusion, the shape and size of which are adapted to the shape and size of the pressure relief hole; Wherein, when the sheet body is coupled with the first valve plate, the protrusion can cover and seal the top of the pressure relief hole.

Images