A special safety valve for liquid hydrogen

Abstract

The present invention relates to the technical field of safety valves, and specifically discloses a safety valve dedicated to liquid hydrogen, comprising a valve body, a valve seat fixedly mounted on the lower inner half of the valve body, a vacuum chamber provided inside the valve seat, a valve cover movably mounted on the upper end of the valve body, an adjusting screw fixedly mounted on the upper end of the valve cover, a valve stem passing through the interior of the adjusting screw, the valve stem being threadedly connected to the adjusting screw, a valve cap mounted on the upper end of the valve cover on the outer side of the adjusting screw, and a first spring sleeved on the outer side of the valve stem. A first bellows and a second bellows are combined to form a double-layer thermal insulation barrier, forming a "vacuum chamber + low thermal conductivity bellows barrier" double insulation structure. The vacuum chamber blocks the axial heat conduction path, and the pleated design of the bellows increases the radial thermal resistance, effectively reducing external heat penetration. At the same time, the flexible structure of the bellows can absorb temperature difference deformation from ultra-low temperature to normal temperature, avoiding leakage of the sealing surface due to thermal stress offset, and significantly extending the sealing life.

Description

Technical Field

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

[0002] As an efficient and clean energy carrier, liquid hydrogen plays a vital role in the hydrogen energy industry chain. However, its ultra-low temperature (-253°C) places extremely high demands on the thermal insulation and safety of storage systems.

[0003] Most existing liquid hydrogen storage tanks use a vacuum insulation layer combined with a traditional safety valve design, but the following problems still exist in actual applications: First, the metal support structure of the traditional safety valve is prone to forming a "thermal bridge", and external heat is transferred to the inside of the storage tank through the valve body, accelerating the gasification of liquid hydrogen. Secondly, existing safety valves mostly rely on a single pressure relief channel. In the event of instantaneous overpressure (such as fire or uncontrolled reaction), the discharge efficiency is insufficient, which can easily lead to the risk of overpressure in the storage tank. Finally, during pressure relief, hydrogen is discharged through the gas pipe. If the pipeline is insufficiently insulated, external heat may be reversely transferred to the storage tank through the gas pipe, exacerbating the gasification of liquid hydrogen. Although the existing technology uses cooling jackets or vacuum insulation pipes, the structure is complex and it is difficult to dynamically adjust the discharge rate, especially in the staged pressure relief scenario. The adaptability is insufficient. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a safety valve dedicated to liquid hydrogen.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A safety valve for liquid hydrogen, comprising a valve body, a valve seat fixedly mounted on the lower half of the interior of the valve body, a vacuum chamber defined within the valve seat, a valve cover movably mounted on the upper end of the valve body, an adjusting screw fixedly mounted on the upper end of the valve cover, a valve stem passing through the interior of the adjusting screw, the valve stem being threadedly connected to the adjusting screw, a valve cap mounted on the upper end of the valve cover, located outside the adjusting screw, a first spring sleeved on the outer side of the valve stem, a guide sleeve fixedly mounted on the upper half of the interior of the valve body for use with the lower end of the valve stem, a valve disc seat slidably mounted on the interior of the guide sleeve, a valve disc clamped and mounted on the bottom surface of the valve disc seat, and the valve disc is located above the valve seat to seal the upper end of the valve seat;

[0007] A first bellows and a second bellows are provided between the guide sleeve and the outer wall of the lower half of the valve disc seat, wherein the first bellows is arranged inside the second bellows, and the ends of the first bellows and the second bellows are fixedly connected to the bottom surface of the guide sleeve and the outer wall of the lower half of the valve disc seat respectively;

[0008] A first gas pipe and a second gas pipe are provided on the outside of the valve body, the first gas pipe is connected to the interior of the valve body, a first connecting pipe is provided between the end of the second gas pipe close to the valve body and the valve body, the two ends of the first connecting pipe are fixedly connected to the outer wall of the end of the valve body and the second gas pipe respectively, the interior of the second gas pipe is connected to the interior of the valve body through the first connecting pipe, wherein the interior of the first gas pipe is provided with a heat insulation component, the interior of the second gas pipe is provided with an auxiliary component, and an adjusting pipe is also fixedly installed on the outer wall of the valve body, and a plurality of bridge pipes are fixedly connected between the adjusting pipe and the second gas pipe, and an adjusting component is also slidably installed inside the adjusting pipe. The adjusting component arranged inside the adjusting pipe can increase the intake amount of hydrogen into the second gas pipe when the instantaneous pressure inside the valve body is too high.

[0009] Preferably, the thermal insulation assembly includes a rotating shaft rotatably installed inside the first gas pipe, and a sealing ball with a diameter matching the inner diameter of the first gas pipe is fixedly installed on the outer wall of the rotating shaft. The outer wall of the sealing ball is provided with multiple grooves, and the grooves are evenly distributed on the outer wall of the sealing ball.

[0010] Preferably, a cooling jacket is fixedly mounted on the outer wall of the first gas transmission pipe, and two pipes are fixedly connected to the lower end of the outer wall of the cooling jacket, and the two pipes are an input pipe and an output pipe respectively.

[0011] Preferably, a cooling jacket is fixedly mounted on the outer wall of the first gas transmission pipe, and two pipes are fixedly connected to the lower end of the outer wall of the cooling jacket, and the two pipes are an input pipe and an output pipe respectively.

[0012] Preferably, a support rod is fixedly installed on the inner wall of the second air supply pipe at a position corresponding to the end of the connecting rod where the second bevel gear is installed, the upper end of the support rod is fixedly connected to the connecting rod, and a protective sleeve is fixedly installed on the outer wall of the second air supply pipe outside the connecting shaft.

[0013] Preferably, the regulating tube is connected to the interior of the valve body, and the regulating assembly includes a piston rod slidably connected to the end of the regulating tube, the end of the piston rod is fixedly connected to a piston plate, and the outer wall of the piston rod connected to the inside of the regulating tube is provided with a second spring, and the two ends of the second spring are respectively fixedly connected to the outer wall of the piston plate and the inner wall of the end of the regulating tube.

[0014] Preferably, the number of the plurality of bridge pipes is not less than two, and the plurality of bridge pipes are equidistantly distributed between the second gas transmission pipe and the regulating pipe.

[0015] Preferably, both inner walls of the groove are arc-shaped, and both inner walls of the groove are concave inwards.

[0016] Preferably, the first bellows and the second bellows have different corrugation curvatures, and the second bellows disposed inside the first bellows has a greater corrugation curvature than the first bellows.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention sets a vacuum cavity inside the valve seat, combines the first bellows and the second bellows to form a double-layer thermal insulation barrier, and forms a double thermal insulation structure of "vacuum cavity + low thermal conductivity corrugated barrier". The vacuum cavity blocks the axial heat conduction path, and the pleated design of the bellows increases the radial thermal resistance, effectively reducing external heat penetration. At the same time, the flexible structure of the bellows can absorb the temperature difference deformation from ultra-low temperature to normal temperature, avoid leakage of the sealing surface caused by thermal stress offset, and significantly extend the sealing life.

[0019] The present invention realizes pressure-graded discharge through the linkage design of the regulating pipe and multiple bridge pipes. When overpressure occurs, the piston plate moves outward under pressure, gradually connecting the bridge pipes to increase the discharge cross-section and improve the discharge flow. A bevel gear transmission system is arranged in the second gas pipeline, and the hydrogen flow rate is used to drive the rotating blades to rotate, synchronously accelerating the rotation of the first gas pipeline sealing ball, thereby increasing the discharge flux of the first gas pipeline.

[0020] The present invention can isolate the external environment and the interior of the valve body through the blocking ball arranged inside the first gas pipe, preventing heat exchange between the external environment and the interior of the valve body. At the same time, the input pipe and the output pipe are used to input refrigerant into the interlayer between the cooling jacket and the first gas pipe, thereby maintaining a low-temperature environment in the first gas pipe and avoiding reverse heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a side view of the overall structure in an embodiment of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the overall structure of an embodiment of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the first gas transmission pipe structure in an embodiment of the present invention;

[0026] Figure 5 For the embodiment of the present invention Figure 3 A partial enlarged schematic diagram in the middle;

[0027] Figure 6 For the embodiment of the present invention Figure 4A partial enlarged schematic diagram of point B in the middle;

[0028] Figure 7 For the embodiment of the present invention Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0029] In the figure: 1. valve body; 2. valve seat; 3. valve cover; 4. valve bonnet; 5. first air pipe; 6. cooling jacket; 7. second air pipe; 8. regulating pipe; 9. first connecting pipe; 10. bridge pipe; 11. vacuum chamber; 12. valve stem; 13. regulating screw; 14. first spring; 15. valve disc; 16. valve disc seat; 17. guide sleeve; 18. first bellows; 19. second bellows; 20. rotating shaft; 21. sealing ball; 22. groove; 23. connecting shaft; 24. first bevel gear; 25. second bevel gear; 26. mounting shaft; 27. rotating blade; 28. connecting rod; 29. ​​support rod; 30. piston plate; 31. second spring; 32. piston rod; 33. protective sleeve. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-7 A safety valve for liquid hydrogen includes a valve body 1, a valve seat 2 is fixedly installed on the lower half of the interior of the valve body 1, a vacuum chamber 11 is opened inside the valve seat 2, a valve cover 3 is movably installed on the upper end of the valve body 1, an adjusting screw 13 is fixedly installed on the upper end of the valve cover 3, a valve stem 12 is passed through the interior of the adjusting screw 13, the valve stem 12 is threadedly connected to the adjusting screw 13, a valve cap 4 is installed on the upper end of the valve cover 3 on the outside of the adjusting screw 13, a first spring 14 is sleeved on the outside of the valve stem 12, a guide sleeve 17 is fixedly installed on the upper half of the interior of the valve body 1 for use with the lower end of the valve stem 12, a valve disc seat 16 is slidably installed inside the guide sleeve 17, a valve disc 15 is clamped and installed on the bottom surface of the valve disc seat 16, and the valve disc 15 is located above the valve seat 2 to seal the upper end of the valve seat 2;

[0032] A first bellows 18 and a second bellows 19 are provided between the guide sleeve 17 and the outer wall of the lower half of the valve disc seat 16, wherein the first bellows 18 is arranged inside the second bellows 19, and the ends of the first bellows 18 and the second bellows 19 are fixedly connected to the bottom surface of the guide sleeve 17 and the outer wall of the lower half of the valve disc seat 16 respectively;

[0033] A first gas pipe 5 and a second gas pipe 7 are provided on the outside of the valve body 1, and the first gas pipe 5 is connected to the interior of the valve body 1. A first connecting pipe 9 is provided between the end of the second gas pipe 7 near the valve body 1 and the valve body 1, and both ends of the first connecting pipe 9 are fixedly connected to the valve body 1 and the outer wall of the end of the second gas pipe 7 respectively. The interior of the second gas pipe 7 is connected to the interior of the valve body 1 through the first connecting pipe 9, wherein the interior of the first gas pipe 5 is provided with a heat insulation component, and the interior of the second gas pipe 7 is provided with an auxiliary component. A regulating pipe 8 is also fixedly installed on the outer wall of the valve body 1, and a plurality of bridge pipes 10 are fixedly connected between the regulating pipe 8 and the second gas pipe 7, and an regulating component is also slidably installed inside the regulating pipe 8. The regulating component provided inside the regulating pipe 8 can increase the intake amount of hydrogen entering the second gas pipe 7 when the instantaneous pressure inside the valve body 1 is too high;

[0034] The device is located at the upper end of the liquid hydrogen storage tank and is vertically arranged. When external heat invades the liquid hydrogen storage tank or an unexpected situation such as a system failure inside the storage tank occurs, the pressure inside the storage tank increases and needs to be relieved through a safety valve. Under normal working conditions, the valve disc 15 is tightly attached to the upper end of the valve seat 2 to seal the upper end of the valve seat 2. A hard alloy sealing surface is used between the second gas pipe 7 and the upper end surface of the valve seat 2. When liquid hydrogen is stored inside the liquid hydrogen storage tank, a vacuum chamber 11 is opened inside the valve seat 2. The vacuum chamber 11 The setting can add a layer of vacuum mold cavity between the liquid hydrogen and the outside world to prevent the heat loss of the liquid hydrogen and avoid the liquid hydrogen from gasifying due to the temperature rise. The first bellows 18 and the second bellows 19 are both made of low thermal conductivity materials. Their thin-walled pleated structure greatly extends the heat conduction path from the external environment to the inside of the tank. At the same time, the first bellows 18 and the second bellows 19 can form a double-layer thermal insulation barrier. Under the action of the first bellows 18 and the second bellows 19, the heat contacting with the liquid hydrogen storage tank can be reduced, further reducing The heat of liquid hydrogen is dissipated. Under normal circumstances, the flexible structure of the first bellows 18 and the second bellows 19 can absorb the temperature difference deformation between the liquid hydrogen temperature zone and the normal temperature environment, avoid the sealing surface deviation caused by thermal stress, and maintain long-term sealing effectiveness. When the system pressure increases and exceeds the preload of the first spring 14, the first spring 14 is compressed and the valve disc 15 is lifted. At this time, the first bellows 18 and the second bellows 19 can be contracted synchronously, and hydrogen enters the interior of the valve body 1 through the channel inside the valve seat 2 and then discharges outward. The height to which the valve disc 15 is lifted upward increases with the increase of pressure. When the system pressure returns to the return pressure of the safety valve, the pressure of the first spring 14 presses the valve disc 15 downward to the upper end of the valve seat 2 and resets it. The hydrogen released into the interior of the valve body 1 can be output to the outside through the first gas pipe 5 and the second gas pipe 7. Under the action of the thermal insulation component arranged inside the first gas pipe 5, the heat exchange between the interior of the valve body 1 and the external environment can be reduced, thereby preventing heat from entering the liquid hydrogen storage tank from the interior of the valve body 1 and causing liquid hydrogen to gasify.

[0035] As a technical optimization solution of the present invention, the thermal insulation component includes a rotating shaft 20 rotatably installed inside the first gas pipe 5, and a sealing ball 21 with a diameter matching the inner diameter of the first gas pipe 5 is fixedly installed on the outer wall of the rotating shaft 20. A plurality of grooves 22 are provided on the outer wall of the sealing ball 21, and the grooves 22 are equidistantly distributed on the outer wall of the sealing ball 21; in the process of releasing hydrogen, the sealing ball 21 arranged inside the first gas pipe 5 can block the external environment and the interior of the valve body 1 to prevent heat exchange between the external environment and the interior of the valve body 1, so that the interior of the first gas pipe 5 separated by the sealing ball 21 is always in a low-temperature environment. When hydrogen is released from the interior of the first gas pipe 5 to the outside, the rotatable sealing ball 21 arranged inside the first gas pipe 5 can rotate continuously, and the hydrogen is continuously transported outward through the multiple grooves 22 opened on the surface of the sealing ball 21.

[0036] As a technical optimization solution of the present invention, a cooling jacket 6 is fixedly installed on the outer wall of the first gas pipe 5, and two pipes are fixedly connected to the lower end of the outer wall of the cooling jacket 6, which are an input pipe and an output pipe respectively; liquid nitrogen or other refrigerant can be input into the interlayer between the cooling jacket 6 and the first gas pipe 5 through the input pipe and the output pipe to keep the hydrogen inside the first gas pipe 5 in a low-temperature environment.

[0037] As a technical optimization solution of the present invention, the auxiliary component includes a connecting rod 28 fixedly connected to the inner wall of one end of the second gas pipe 7 near the valve body 1, and the end of the connecting rod 28 is rotatably installed with a second bevel gear 25, and the outer wall of the second bevel gear 25 is fixedly installed with a mounting shaft 26, and the outer wall of the mounting shaft 26 is fixedly installed with a rotating blade 27. The auxiliary component also includes a connecting shaft 23 fixedly connected to the outer wall of the rotating shaft 20 near the second gas pipe 7, and the end of the connecting shaft 23 passes through the pipe wall of the second gas pipe 7 and extends to the interior of the second gas pipe 7. The end of the connecting shaft 23 connected to the interior of the second gas pipe 7 is fixedly connected to the first bevel gear 24 meshing with the second bevel gear 25; the hydrogen inside the valve body 1 can be discharged to the outside through the second gas pipe 7 connected to the interior of the valve body 1. When the hydrogen passes through the interior of the second gas pipe 7, the horizontal airflow drives the rotating blade 27 to rotate. The shape of the rotating blade 27 is similar to that of Savonius The blades in the vertical axis wind wheel have the same shape. The rotating blades 27 are fixedly connected to the second bevel gear 25 through the mounting shaft 26. The rotating blades 27 can drive the second bevel gear 25 to rotate synchronously. The second bevel gear 25 is meshed with the first bevel gear 24. Under the action of the meshing transmission, the first bevel gear 24, the connecting shaft 23 and the rotating shaft 20 fixedly connected to the connecting shaft 23 can be driven to rotate synchronously, thereby accelerating the rotation speed of the blocking ball 21 provided on the outer wall of the rotating shaft 20, that is, accelerating the speed of hydrogen discharge to the outside through the first gas pipeline 5.

[0038] As a technical optimization solution of the present invention, a support rod 29 is fixedly installed on the inner wall of the second air pipe 7 and the corresponding position of the end of the connecting rod 28 where the second bevel gear 25 is installed. The upper end of the support rod 29 is fixedly connected to the connecting rod 28. The end of the connecting rod 28 can be supported by the support rod 29, thereby enhancing the stability of the internal structure of the second air pipe 7 during use. A protective sleeve 33 is fixedly installed on the outer wall of the second air pipe 7 on the outside of the connecting shaft 23, and the connecting shaft 23 is protected by the protective sleeve 33.

[0039] As a technical optimization solution of the present invention, the regulating tube 8 is connected to the interior of the valve body 1, and the regulating assembly includes a piston rod 32 slidably connected to the end of the regulating tube 8, and the end of the piston rod 32 is fixedly connected to the piston plate 30. The outer wall of the piston rod 32 connected to the inside of the regulating tube 8 is provided with a second spring 31, and the two ends of the second spring 31 are respectively fixedly connected to the outer wall of the piston plate 30 and the inner wall of the end of the regulating tube 8; when the rate at which hydrogen is output to the inside of the valve body 1 through the internal channel of the valve seat 2 is greater than the rate at which hydrogen is output to the outside of the valve body 1, it will cause the pressure of the hydrogen inside the valve body 1 to be too high, and the regulating tube 8 is connected to the inside of the valve body 1. When the internal pressure of the valve body 1 continues During the increase process, when the pressure inside the regulating tube 8 is greater than the preload force of the second spring 31, the piston plate 30 inside the regulating tube 8 can be pushed outward. When the piston plate 30 moves outward to make the bridge tube 10 closest to the valve body 1 connected to the interior of the regulating tube 8, the hydrogen can be discharged to the interior of the second gas pipe 7 through the regulating tube 8 and the bridge tube 10. If the pressure inside the valve body 1 continues to increase, the piston plate 30 is continuously squeezed outward, and the multiple bridge tubes 10 arranged between the second gas pipe 7 and the regulating tube 8 are all connected to the interior of the regulating tube 8. The gas inside the valve body 1 can be depressurized in stages through the cooperation of the regulating assembly and the multiple bridge tubes 10.

[0040] As a technical optimization solution of the present invention, the number of the multiple bridge pipes 10 is not less than two, and the multiple bridge pipes 10 are equidistantly distributed between the second gas supply pipe 7 and the regulating pipe 8; the setting of the multiple bridge pipes 10 can perform graded pressure relief on the interior of the valve body 1, and the number of bridge pipes 10 used for pressure relief is adjusted according to the gas pressure inside the valve body 1.

[0041] As a technical optimization solution of the present invention, the inner walls on both sides of the groove 22 are both arc-shaped, and the inner walls on both sides of the groove 22 are concave inward; the special setting inside the groove 22 can expand the accommodating area inside the groove 22, and when the airflow enters the interior of the groove 22 along the horizontal direction, it can drive the blocking ball 21 to rotate.

[0042] As a technical optimization solution of the present invention, the first bellows 18 and the second bellows 19 have different corrugation curvatures, and the corrugation curvature of the second bellows 19 arranged on the inner side of the first bellows 18 is greater than the corrugation curvature of the first bellows 18; the amount of heat contact between the first bellows 18 and the second bellows 19 is different, so the corrugation curvatures of the first bellows 18 and the second bellows 19 are different, and according to the temperature difference, the first bellows 18 and the second bellows 19 may undergo different degrees of temperature difference deformation.

[0043] When the present invention is in use, the device is vertically arranged at the upper end of the liquid hydrogen storage tank. When external heat invades the liquid hydrogen storage tank or an unexpected situation such as a system failure inside the storage tank occurs, the pressure inside the storage tank increases and needs to be relieved through a safety valve. Under normal working conditions, the valve disc 15 is tightly attached to the upper end of the valve seat 2 to seal the upper end of the valve seat 2. A hard alloy sealing surface is used between the second gas supply pipe 7 and the upper end surface of the valve seat 2. When liquid hydrogen is stored inside the liquid hydrogen storage tank, a vacuum chamber 11 is opened inside the valve seat 2. The setting of the vacuum chamber 11 can add a layer of vacuum mold cavity between the liquid hydrogen and the outside world to prevent the heat of the liquid hydrogen from dissipating and avoid the liquid hydrogen from gasifying due to temperature rise. The first bellows 18 and the second bellows 19 are both made of low thermal conductivity material, and their thin-walled corrugated structure greatly extends the heat conduction path from the external environment to the inside of the storage tank. At the same time, the first bellows 18 and the second bellows The tube 19 can form a double-layer thermal insulation barrier. Under the action of the first bellows 18 and the second bellows 19, the heat in contact with the liquid hydrogen storage tank can be reduced, further reducing the heat loss of liquid hydrogen. Under normal circumstances, the flexible structure of the first bellows 18 and the second bellows 19 can absorb the temperature difference deformation between the liquid hydrogen temperature zone and the normal temperature environment, avoid the sealing surface deviation caused by thermal stress, and maintain long-term sealing effectiveness. When the system pressure increases and exceeds the preload of the first spring 14, the first spring 14 is compressed and the valve disc 15 is lifted. At this time, the first bellows 18 and the second bellows 19 can be contracted synchronously, and hydrogen enters the interior of the valve body 1 through the channel inside the valve seat 2 and then discharges to the outside. The height of the valve disc 15 rising upward increases with the increase of pressure. When the system pressure returns to the return pressure of the safety valve, the pressure of the first spring 14 presses the valve disc 15 downward to the upper end of the valve seat 2 to reset.

[0044] In the process of depressurizing the liquid hydrogen storage tank, hydrogen is output from the internal channel of the valve seat 2 to the inside of the valve body 1, and then a large amount of hydrogen is discharged outward through the first gas pipe 5. In the process of discharging hydrogen, the sealing ball 21 arranged inside the first gas pipe 5 can isolate the external environment and the interior of the valve body 1 to prevent the external environment from exchanging heat with the interior of the valve body 1, so that the interior of the first gas pipe 5 separated by the sealing ball 21 is always in a low-temperature environment. When hydrogen is discharged from the interior of the first gas pipe 5 to the outside, the rotatable sealing ball 21 arranged inside the first gas pipe 5 can rotate continuously, and the hydrogen is continuously transported outward through the multiple grooves 22 opened on the surface of the sealing ball 21. At the same time, the hydrogen inside the valve body 1 can be discharged through the sealing ball 21. The second gas pipe 7 connected to the valve body 1 is discharged outward, and the hydrogen inside the valve body 1 enters the interior of the second gas pipe 7 through the first connecting pipe 9. A one-way valve is provided at the end of the first connecting pipe 9 to prevent the hydrogen inside the second gas pipe 7 from flowing back to the interior of the valve body 1. When the hydrogen passes through the interior of the second gas pipe 7, the airflow in the horizontal direction drives the rotating blade 27 to rotate. The rotating blade 27 is fixedly connected to the second bevel gear 25 through the mounting shaft 26, and the rotating blade 27 can drive the second bevel gear 25 to rotate synchronously. The second bevel gear 25 is meshed with the first bevel gear 24. Under the action of the meshing transmission, the first bevel gear 24, the connecting shaft 23 and the rotating shaft 20 fixedly connected to the connecting shaft 23 can be driven to rotate synchronously, thereby accelerating the rotating shaft 20 The speed of rotation of the blocking ball 21 arranged on the outer wall accelerates the speed of hydrogen being discharged outward through the first gas pipe 5. When the speed at which hydrogen is output to the inside of the valve body 1 through the internal channel of the valve seat 2 is greater than the speed at which hydrogen is output outward from the inside of the valve body 1, the pressure of the hydrogen inside the valve body 1 will be too high. The regulating pipe 8 is connected to the inside of the valve body 1. During the process of continuous increase in the internal pressure of the valve body 1, when the pressure inside the regulating pipe 8 is greater than the preload force of the second spring 31, the piston plate 30 inside the regulating pipe 8 can be pushed outward. When the piston plate 30 moves outward to make the bridge pipe 10 closest to the valve body 1 connected to the inside of the regulating pipe 8, the hydrogen can be discharged to the inside of the second gas pipe 7 through the regulating pipe 8 and the bridge pipe 10. If the valve body If the internal pressure continues to increase, the piston plate 30 is continuously squeezed outward. The multiple bridge pipes 10 disposed between the second gas pipeline 7 and the regulating pipe 8 are all connected to the interior of the regulating pipe 8. Hydrogen can be introduced into the interior of the second gas pipeline 7 through the multiple bridge pipes 10. If the inner wall diameter of the second gas pipeline 7 remains unchanged, the greater the volume flow rate of hydrogen entering the second gas pipeline 7 per unit time, the faster the flow rate of hydrogen inside the second gas pipeline 7, and thus the faster the rotation speed of the rotating blade 27. Under the connection between the rotating blade 27, the mounting shaft 26, the second bevel gear 25, the first bevel gear 24, the connecting shaft 23, and the rotating shaft 20, the faster the rotation speed of the rotating blade 27 can also simultaneously increase the rotation speed of the rotating shaft 20.When the rotation speed of the rotating shaft 20 is increased, the speed of hydrogen release from the first gas pipeline 5 and the speed of hydrogen release from the valve body 1 as a whole are accelerated. When the hydrogen pressure inside the valve body 1 decreases, the gas pressure inside the regulating tube 8 decreases synchronously. Under the action of the second spring 31, the piston plate 30 is squeezed and reset. At this time, the device can perform normal pressure relief until the entire relief process is completed, allowing the valve disc 15 to reseal the upper end of the valve seat 2.

[0045] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0046] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A safety valve for liquid hydrogen, comprising a valve body (1), wherein a valve seat (2) is fixedly mounted on the lower half of the inner portion of the valve body (1), and characterized in that: The valve seat (2) is provided with a vacuum chamber (11) inside, a valve cover (3) is movably mounted on the upper end of the valve body (1), an adjusting screw (13) is fixedly mounted on the upper end of the valve cover (3), a valve stem (12) is passed through the interior of the adjusting screw (13), the valve stem (12) is threadedly connected to the adjusting screw (13), a valve cap (4) is mounted on the upper end of the valve cover (3) on the outside of the adjusting screw (13), a first spring (14) is sleeved on the outside of the valve stem (12), a guide sleeve (17) for use with the lower end of the valve stem (12) is fixedly mounted on the upper inner half of the valve body (1), a valve disc seat (16) is slidably mounted on the inner portion of the guide sleeve (17), a valve disc (15) is clamped and mounted on the bottom surface of the valve disc seat (16), and the valve disc (15) is located above the valve seat (2) to seal the upper end of the valve seat (2); A first bellows (18) and a second bellows (19) are provided between the guide sleeve (17) and the outer wall of the lower half of the valve disc seat (16), wherein the first bellows (18) is arranged inside the second bellows (19), and both ends of the first bellows (18) and the second bellows (19) are fixedly connected to the bottom surface of the guide sleeve (17) and the outer wall of the lower half of the valve disc seat (16), respectively; The valve body (1) is provided with a first gas pipe (5) and a second gas pipe (7) on the outside. The first gas pipe (5) is connected to the inside of the valve body (1). A first connecting pipe (9) is provided between the end of the second gas pipe (7) near the valve body (1) and the valve body (1). The two ends of the first connecting pipe (9) are fixedly connected to the outer wall of the valve body (1) and the end of the second gas pipe (7), respectively. The inside of the second gas pipe (7) is connected to the inside of the valve body (1) through the first connecting pipe (9). The inside of the first gas pipe (5) is provided with a heat insulation component, and the inside of the second gas pipe (7) is provided with an auxiliary component. The outer wall of the valve body (1) is also fixedly installed with a regulating pipe (8). A plurality of bridge pipes (10) are fixedly connected between the regulating pipe (8) and the second gas pipe (7), and a regulating component is also slidably installed inside the regulating pipe (8). The regulating component provided inside the regulating pipe (8) can increase the intake amount of hydrogen into the second gas pipe (7) when the instantaneous pressure inside the valve body (1) is too high.

2. A liquid hydrogen-specific safety valve according to claim 1, characterized in that: The heat insulation component comprises a rotating shaft (20) rotatably mounted inside the first gas pipe (5); a sealing ball (21) having a diameter matching the inner diameter of the first gas pipe (5) is fixedly mounted on the outer wall of the rotating shaft (20); a plurality of grooves (22) are formed on the outer wall of the sealing ball (21), and the grooves (22) are equidistantly distributed on the outer wall of the sealing ball (21).

3. A liquid hydrogen-specific safety valve according to claim 2, characterized in that: A cooling jacket (6) is fixedly mounted on the outer wall of the first gas transmission pipe (5), and two pipes are fixedly connected to the lower end of the outer wall of the cooling jacket (6), the two pipes being an input pipe and an output pipe respectively.

4. A liquid hydrogen-specific safety valve according to claim 3, characterized in that: The auxiliary component includes a connecting rod (28) fixedly connected to the inner wall of one end of the second gas pipe (7) near the valve body (1), a second bevel gear (25) is rotatably mounted on the end of the connecting rod (28), a mounting shaft (26) is fixedly mounted on the outer wall of the second bevel gear (25), and a rotating blade (27) is fixedly mounted on the outer wall of the mounting shaft (26). The auxiliary component also includes a connecting shaft (23) fixedly connected to the outer wall of one end of the rotating shaft (20) near the second gas pipe (7), the end of the connecting shaft (23) passes through the wall of the second gas pipe (7) and extends to the interior of the second gas pipe (7), and the end of the connecting shaft (23) connected to the interior of the second gas pipe (7) is fixedly connected to the first bevel gear (24) meshing with the second bevel gear (25).

5. A safety valve for liquid hydrogen according to claim 4, characterized in that: A support rod (29) is fixedly mounted on the inner wall of the second gas delivery pipe (7) and the end of the connecting rod (28) on which the second bevel gear (25) is mounted, and the upper end of the support rod (29) is fixedly connected to the connecting rod (28). A protective sleeve (33) is fixedly mounted on the outer wall of the second gas delivery pipe (7) on the outside of the connecting shaft (23).

6. A safety valve for liquid hydrogen according to claim 5, characterized in that: The regulating tube (8) is connected to the interior of the valve body (1), and the regulating assembly includes a piston rod (32) slidably connected to the end of the regulating tube (8), the end of the piston rod (32) is fixedly connected to the piston plate (30), and the outer wall of the piston rod (32) connected to the inside of the regulating tube (8) is provided with a second spring (31), and the two ends of the second spring (31) are respectively fixedly connected to the outer wall of the piston plate (30) and the inner wall of the end of the regulating tube (8).

7. A safety valve for liquid hydrogen according to claim 6, characterized in that: The number of the plurality of bridge pipes (10) is no less than two, and the plurality of bridge pipes (10) are equidistantly distributed between the second gas transmission pipe (7) and the regulating pipe (8).

8. A safety valve for liquid hydrogen according to claim 7, characterized in that: The inner walls on both sides of the groove (22) are both arranged in an arc shape, and the inner walls on both sides of the groove (22) are both concave inwards.

9. A safety valve for liquid hydrogen according to claim 8, characterized in that: The first bellows (18) and the second bellows (19) have different corrugation curvatures, and the second bellows (19) disposed inside the first bellows (18) has a greater corrugation curvature than the first bellows (18).

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