Double-R composite sealing structure and high-pressure hydrogen pressure reducing valve

Abstract

The invention relates to the technical field of pressure reducing valves, and discloses a double-R composite sealing structure which comprises a valve rod, a first sealing ring, a second sealing ring, a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are coaxially arranged in the circumferential direction of the valve rod from inside to outside, the first sealing ring is arranged at the upper end of the first sealing ring, and the second sealing ring is arranged at the lower end of the second sealing ring. The first sealing ring can abut against the first sealing ring, the second sealing ring is arranged on the outer wall of the first sealing ring in a sleeving mode, and the second sealing ring can abut against the second sealing ring; the first sealing ring and the second sealing ring are driven by the valve rod to move until the first sealing ring and the second sealing ring abut against the first sealing ring and the second sealing ring, so that circulation of high-pressure hydrogen is isolated, leakage is prevented, and the first sealing ring and the second sealing ring have the characteristics of different strength, different temperature resistance, different elastic deformation and the like; the contradiction that the same material is difficult to consider high elasticity and high strength at the same time is avoided, and the reliable sealing performance can be achieved through single-stage pressure reduction.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, and in particular to a double-R composite sealing structure and a high-pressure hydrogen pressure reducing valve. Background Art

[0002] A high-pressure hydrogen pressure reducer is a device that reduces the high-pressure gas pressure in a vehicle-mounted gas cylinder to the low-pressure gas pressure required by a fuel cell or internal combustion engine. When the inlet pressure or outlet load changes, the regulator can automatically adjust to keep the outlet pressure within the set range, thereby achieving the effect of reducing the pressure and stabilizing the outlet pressure.

[0003] In the prior art, most high-pressure hydrogen pressure reducers adopt double-stage or multi-stage sealing, and the hardness of the sealing material is relatively high to resist fatigue during long-term use. For hydrogen with the smallest molecules, this high-hardness sealing method is difficult to completely solve the problem of slow leakage of hydrogen. For this reason, we propose a double R composite sealing structure and a high-pressure hydrogen pressure reducing valve to solve the above problem. Summary of the invention

[0004] The present invention is intended to provide a double R composite sealing structure and a high-pressure hydrogen pressure reducing valve to solve the problem of slow leakage of the high-pressure hydrogen pressure reducing valve.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a double R composite sealing structure, including a valve stem and a first sealing surface and a second sealing surface arranged on the outside of the valve stem.

[0006] The beneficial effect of this solution is that hydrogen is isolated by the first sealing surface and the second sealing surface, thereby preventing leakage of hydrogen.

[0007] Preferably, as an improvement, it also includes a first sealing ring, a second sealing ring, a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are both coaxially arranged with the valve stem, and the first sealing ring is located in the second sealing ring, the first sealing ring is located in the second sealing ring, the end face of the first sealing ring is a first sealing surface, and the first sealing surface can abut against the end face of the first sealing ring, the end face of the second sealing ring is a second sealing surface, and the second sealing surface can abut against the end face of the second sealing ring.

[0008] The beneficial effect is that the first sealing ring and the second sealing ring are driven to move by the valve stem, and during the movement, the first sealing ring and the second sealing ring are respectively abutted against the end faces of the first sealing ring and the second sealing ring, thereby improving the sealing performance of the sealing structure and avoiding the problem of hydrogen leakage caused by a single sealing surface.

[0009] Preferably, as an improvement, the second sealing ring is made of high-strength and high and low temperature resistant sealing material, the first sealing ring is made of high-elasticity and high and low temperature resistant sealing material, the height of the first sealing ring is greater than the height of the second sealing ring, the height of the second sealing ring is greater than the height of the first sealing ring, and the valve stem, the first sealing ring and the second sealing ring are integrally formed.

[0010] The beneficial effects are as follows: the first sealing ring and the second sealing ring adopt two characteristics of different strength, different temperature resistance, different elastic deformation, etc., avoiding the contradiction between high elasticity and high strength that are difficult to take into account at the same time for the same material, and reliable sealing performance can be achieved by using single-stage pressure reduction. The second sealing ring adopts high-strength high and low temperature resistant sealing material, which abuts against the end face of the second sealing ring to play the first layer of sealing. However, because hydrogen molecules are very small, under normal circumstances, the high-strength second sealing ring and the second sealing ring cannot guarantee zero leakage. Therefore, the first sealing ring adopts a low-strength high and low temperature resistant sealing material, but the elastic deformation performance is very superior, and it abuts against the first sealing ring to play the second layer of sealing, so that the hydrogen is completely sealed, and the first sealing ring and the second sealing ring are driven by a valve stem to abut against the first sealing ring and the second sealing ring, thereby improving the sealing of hydrogen, thereby solving the problem of slow leakage of hydrogen.

[0011] By changing the heights of the first sealing ring, the second sealing ring, the first sealing ring and the second sealing ring, the sealing surface where the first sealing ring contacts the first sealing ring is higher than the sealing surface where the second sealing ring contacts the second sealing ring, so that the first sealing ring contacts the first sealing ring first, thereby slowing down the leakage of hydrogen, and also reducing the wear of the second sealing ring on the end face of the second sealing ring, thereby increasing the service life of the second sealing ring; when a certain amount of hydrogen leaks, the second sealing ring completely contacts the second sealing ring, thereby further improving the sealing performance of the sealing structure and preventing hydrogen leakage.

[0012] Preferably, as an improvement, the second sealing ring is provided with an installation groove, the first sealing ring is embedded in the installation groove, and the inner radius of the second sealing ring is greater than the inner radius of the first sealing ring, and the outer radius of the first sealing ring is greater than the inner radius of the second sealing ring.

[0013] The beneficial effect is: since the first sealing ring has low strength and high elasticity, the first sealing ring is wrapped by a high-strength second sealing ring to provide support for it, thereby preventing the first sealing ring from excessively deforming under the extrusion of the first sealing ring and reducing the service life of the first sealing ring.

[0014] Preferably, as an improvement, it also includes an upper shell and a lower shell, the upper shell is arranged at the upper end of the lower shell, the lower shell is provided with an air inlet, an air outlet, a low-pressure chamber, a high-pressure chamber and an installation chamber, the air inlet and the air outlet are both provided on the outer wall of the lower shell, the installation chamber is provided in the middle of the lower shell, the air inlet and the installation chamber are connected through the high-pressure chamber, the low-pressure chamber is provided at one end of the lower shell close to the upper shell, and the low-pressure chamber is connected to the air outlet, a connecting hole is provided at one end of the lower shell close to the upper shell, the low-pressure chamber and the installation chamber are connected through the connecting hole, a double R composite sealing structure is provided in the installation chamber, and a first sealing ring and a second sealing ring are provided on the inner wall of the upper end of the installation chamber.

[0015] An adjusting chamber is provided inside the upper shell body, which is connected with the low-pressure chamber. An adjusting assembly is provided in the adjusting chamber, which includes a spring seat, a spring and a piston. The spring seat is provided on the inner wall of the upper end of the adjusting chamber, the spring sleeve is provided on the outer wall of the lower end of the spring seat, the piston is provided on the end of the spring away from the spring seat, and the piston is fitted with the inner wall of the adjusting chamber. The valve stem extends to one end of the low-pressure chamber through a connecting hole and is connected with the end of the piston close to the lower shell body.

[0016] The beneficial effect is that hydrogen enters the installation cavity through the air inlet and the high-pressure cavity, the connecting hole is used to transmit the hydrogen in the installation cavity to the low-pressure cavity, and then discharges the pressure reducing valve through the air outlet to enter the fuel cell or internal combustion engine.

[0017] When hydrogen enters the low-pressure chamber through the connecting hole, as the gas pressure in the low-pressure chamber increases, the piston moves toward the upper end of the regulating chamber under the action of pressure, thereby increasing the volume of the low-pressure chamber to reduce the pressure in the low-pressure chamber. In this process, the rising piston will drive the valve stem to move upward, so that the first sealing ring and the second sealing ring are respectively abutted against the first sealing ring and the second sealing ring, thereby blocking the hydrogen from continuing to enter the low-pressure chamber, thereby reducing the pressure of the hydrogen.

[0018] Preferably, as an improvement, a reset assembly is provided in the installation cavity, the reset assembly includes a support seat, a reset washer and a reset spring, the support seat is provided in the installation cavity, a plurality of air holes are equidistantly provided on the outer wall of the support seat, a slide groove is provided on the support seat, the valve stem is provided in the slide groove, the reset washer is provided at one end of the support seat close to the valve stem, and the reset washer is sleeved on the outer wall of the valve stem, the reset spring is provided between the reset washer and the second sealing ring, an air guide ring is provided on the inner wall of the installation cavity, and the air guide ring is located on the outer wall of the second sealing ring, a plurality of ventilation grooves are equidistantly provided on the outer wall of the air guide ring, and a plurality of notches corresponding to the ventilation grooves are equidistantly provided on the outer wall of the second sealing ring.

[0019] The beneficial effects are as follows: the support seat is used to open a slide groove, the slide groove is used to install the valve stem, the air hole is used to introduce hydrogen into the support seat, the reset washer is used to install the reset spring, and the reset spring is used to reset the valve stem.

[0020] When hydrogen is not introduced into the pressure reducing valve, the outer wall of the second sealing ring fits with the inner wall of the air guide ring. When hydrogen enters the support seat through the air holes of the support seat, the air pressure in the support seat increases, causing the second sealing ring that fits with the air guide ring to move toward the upper end, thereby reducing the air pressure in the support seat. During the rising process of the second sealing ring, the notch on the outer wall of the second sealing ring is opposite to the ventilation groove on the outer wall of the air guide ring, thereby forming an air flow channel, so that hydrogen flows through the air flow channel to the second sealing ring and the upper end of the first sealing ring.

[0021] Preferably, as an improvement, a suspension seat is provided at one end of the piston close to the lower shell, and a clamping block is provided at one end of the valve stem close to the upper shell, and the clamping block is clamped with the suspension seat.

[0022] The beneficial effect is that the piston and the valve stem are designed to be detachable, thereby reducing the cost of replacing parts and facilitating installation by workers.

[0023] Preferably, as an improvement, an adjusting bolt is provided at one end of the upper shell away from the lower shell, and the adjusting bolt extends to one end of the adjusting cavity and is connected to the spring seat.

[0024] The beneficial effect is: by rotating the adjusting bolt, the position of the spring seat in the adjusting chamber is adjusted, thereby controlling the compression amount of the spring, and then by controlling the difficulty of the piston moving, the hydrogen pressure in the low-pressure chamber is adjusted.

[0025] Preferably, as an improvement, a balancing hole is provided in the lower shell, and the balancing hole is connected to the air outlet and the slide groove.

[0026] The beneficial effect is: since one end of the valve stem is located in the low-pressure chamber and the other end is located in the slide groove, in order to make the movement of the valve stem more stable, a balancing hole is provided to connect the low-pressure chamber and the slide groove, thereby offsetting the pressure difference at both ends of the balancing valve stem and increasing the stability of the valve stem movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the pressure reducing valve according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic cross-sectional structural diagram of a pressure reducing valve according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic structural diagram of a valve stem, a first sealing ring, and a second sealing ring according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of an air guide ring according to an embodiment of the present invention;

[0031] Figure 5 It is a schematic structural diagram of a suspension seat according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] The figure marks in the drawings of the specification include: upper shell 1, lower shell 2, air inlet 3, air outlet 4, installation cavity 5, high-pressure cavity 6, low-pressure cavity 7, connecting hole 8, valve stem 9, first sealing ring 10, second sealing ring 11, first sealing ring 12, second sealing ring 13, support seat 14, reset washer 15, reset spring 16, air hole 17, slide groove 18, balance hole 19, air guide ring 20, ventilation groove 21, notch 22, adjusting cavity 23, adjusting bolt 24, spring seat 25, spring 26, piston 27, suspension seat 28, block 29, first Y-shaped ring 30, second Y-shaped ring 31, ventilation plug 32.

[0034] Example

[0035] The embodiment is basically as shown in the attached Figure 1-5 As shown, Figure 1 The double R composite sealing structure and high-pressure hydrogen pressure reducing valve shown in the figure include an upper shell 1 and a lower shell 2. The upper shell 1 is fixedly installed on the upper end of the lower shell 2 by bolts, and a third sealing ring is fixedly installed between the upper shell 1 and the lower shell 2. The lower shell 2 is provided with an air inlet 3, an air outlet 4, a low-pressure chamber 7, a high-pressure chamber 6 and an installation chamber 5. Figure 2 As shown, the air inlet 3 and the air outlet 4 are both opened on the outer wall of the lower shell body 2, the installation cavity 5 is opened in the middle of the lower end of the lower shell body 2, the air inlet 3 and the installation cavity 5 are connected through the high-pressure cavity 6, the low-pressure cavity 7 is opened in the middle of the upper end of the lower shell body 2, and the low-pressure cavity 7 is connected to the air outlet 4, and a connecting hole 8 is opened in the middle of the upper end of the lower shell body 2, and the low-pressure cavity 7 is connected to the installation cavity 5 through the connecting hole 8.

[0036] like Figure 2 As shown, a double R composite sealing structure is provided in the installation cavity 5, including a valve stem 9 and a first sealing surface and a second sealing surface arranged outside the valve stem 9, and also including a first sealing ring 10, a second sealing ring 11, a first sealing ring 12 and a second sealing ring 13, as shown in FIG. Figure 3 As shown, the valve stem 9, the first sealing ring 10 and the second sealing ring 11 are designed as an integral whole. The first sealing ring 10 and the second sealing ring 11 are coaxially arranged on the circumference of the valve stem 9 from the inside to the outside. The first sealing ring 10 and the second sealing ring 11 are formed by rotating one circle along the vertical line of "r". The upper end face of the first sealing ring 10 is the first sealing face, which can abut against the end face of the first sealing ring 12. The upper end face of the second sealing ring 11 is the second sealing face, which can abut against the end face of the second sealing ring 13. The height of the first sealing ring 10 is greater than the height of the second sealing ring 11. Figure 2The first sealing ring 12 and the second sealing ring 13 shown are both fixedly mounted on the inner wall of the upper end of the mounting cavity 5, and the second sealing ring 13 is sleeved on the outer wall of the first sealing ring 12, and the height of the second sealing ring 13 is greater than the height of the first sealing ring 12, the length of the second sealing ring 11 is greater than the length of the first sealing ring 10, the second sealing ring 13 is provided with a mounting groove, the first sealing ring 12 is embedded in the mounting groove, and the inner radius of the second sealing ring 13 is greater than the inner radius of the first sealing ring 12, and the outer radius of the first sealing ring 12 is greater than the inner radius of the second sealing ring 13.

[0037] The first sealing ring 12 and the second sealing ring 13 adopt two characteristics of different strength, different temperature resistance, different elastic deformation, etc., to avoid the contradiction between high elasticity and high strength that are difficult to take into account at the same time for the same material, and reliable sealing performance can be achieved by using single-stage decompression. The second sealing ring 13 adopts high-strength high and low temperature resistant sealing material, and abuts against the end face of the second sealing ring 11 to play the first layer of sealing. However, because hydrogen molecules are very small, under normal circumstances, the high-strength second sealing ring 13 and the second sealing ring 11 cannot guarantee zero leakage. Therefore, the first sealing ring 12 adopts a material with lower strength and high and low temperature resistant sealing, but has very excellent elastic deformation performance. It abuts against the first sealing ring 10 to play the second layer of sealing, so that the hydrogen is completely sealed, and the first sealing ring 10 and the second sealing ring 11 are driven by a valve stem 9 to abut against the first sealing ring 12 and the second sealing ring 13, thereby improving the sealing of hydrogen, thereby solving the problem of slow leakage of hydrogen.

[0038] The reset assembly includes a support seat 14, a reset washer 15 and a reset spring 16. Figure 2 As shown, the support seat 14 is fixedly installed in the installation cavity 5, and a plurality of air holes 17 are equidistantly opened on the outer wall of the support seat 14, and each air hole 17 is located in the same horizontal plane as the high-pressure cavity 6. A slide groove 18 is opened on the inner wall of the lower end of the support seat 14, and the lower end of the valve stem 9 is slidably set in the slide groove 18. The reset washer 15 is fixedly installed on one end of the support seat 14 close to the valve stem 9, and the reset washer 15 is sleeved on the outer wall of the valve stem 9. The reset spring 16 is arranged between the reset washer 15 and the second sealing ring 11. The upper end of the valve stem 9 passes through the connecting hole 8 and extends into the low-pressure cavity 7. A balance hole 19 is opened on the lower shell 2, and the balance hole 19 connects the air outlet 4 with the slide groove 18.

[0039] like Figure 2 As shown, an air guide ring 20 is fixedly installed on the inner wall of the installation cavity 5. The air guide ring 20 is located at the upper end of the support seat 14, and the air guide ring 20 is located on the outer wall of the second sealing ring 11. Figure 4 The outer wall of the air guide ring 20 shown is equidistantly provided with a plurality of ventilation grooves 21 , and the outer wall of the second sealing ring 11 is equidistantly provided with a plurality of notches 22 corresponding to the ventilation grooves 21 . The notches 22 are located on the outer wall of the lower end of the second sealing ring 11 , and the plane of the notches 22 forms an angle of 30-60° with the axis of the valve stem 9 .

[0040] An adjustment chamber 23 is provided inside the upper shell 1. Figure 2 As shown, the regulating chamber 23 is connected with the low-pressure chamber 7, the upper end of the upper shell 1 is threadedly connected with an adjusting bolt 24, and the lower end of the adjusting bolt 24 extends into the regulating chamber 23, and an adjusting assembly is arranged in the regulating chamber 23, and the adjusting assembly includes a spring seat 25, a spring 26 and a piston 27, the spring seat 25 is fixedly mounted on the lower end of the adjusting bolt 24, the spring 26 is sleeved on the outer wall of the lower end of the spring seat 25, the piston 27 is fixedly mounted on the lower end of the spring 26, and the piston 27 is in contact with the inner wall of the regulating chamber 23, and the lower end of the piston 27 is threadedly connected with a suspension seat 28, as shown in FIG. Figure 5 As shown, a clamping block 29 is provided at the upper end of the valve stem 9 , and the clamping block 29 is clamped with the suspension seat 28 .

[0041] like Figure 2 As shown, a first Y-ring 30 is fixedly installed on the inner wall of the support seat 14, and the first Y-ring 30 is used to prevent hydrogen from entering the low-pressure chamber 7 through the slide groove 18 and the balance hole 19. A second Y-ring 31 is provided on the outer wall of the piston 27, and the second Y-ring 31 is used to prevent hydrogen from entering the regulating chamber 23 to avoid hydrogen leakage. A vent plug 32 is fixedly installed on the outer wall of the upper shell 1, and the vent plug 32 is connected to the regulating chamber 23, and the vent plug 32 is used to maintain the air pressure balance in the regulating chamber 23.

[0042] The specific implementation process is as follows:

[0043] When hydrogen is not introduced into the pressure reducing valve, the spring 26 and the return spring 16 are in a natural state. At this time, the outer wall of the second sealing ring 11 fits against the inner wall of the air guide ring 20, and the notches 22 on the outer wall of the second sealing ring 11 are all located below the ventilation grooves 21. At the same time, the first sealing ring 10 and the second sealing ring 11 are not in contact with the first sealing ring 12 and the second sealing ring 13.

[0044] When high-pressure hydrogen is introduced into the pressure reducing valve, the high-pressure hydrogen enters the high-pressure chamber 6 through the air inlet 3, and then enters the support seat 14 through the air hole 17 of the support seat 14. At this time, the air pressure in the support seat 14 increases, so that the second sealing ring 11 that fits the inner wall of the air guide ring 20 moves to the upper end, thereby reducing the air pressure in the support seat 14, and then the valve stem 9 moves upward along the slide groove 18 of the support seat 14. In the process of the valve stem 9 rising, the notch 22 on the outer wall of the second sealing ring 11 is opposite to the ventilation groove 21 on the outer wall of the air guide ring 20, thereby forming an air flow channel, allowing hydrogen to pass through the air flow channel. The high-pressure hydrogen flows through the passage to the second sealing ring 11 and the upper end of the first sealing ring 10, and then enters the low-pressure chamber 7 through the connecting hole 8. As the gas pressure in the low-pressure chamber 7 increases, the piston 27 moves toward the upper end of the regulating chamber 23 under the action of the pressure, thereby increasing the volume of the low-pressure chamber 7 to reduce the pressure in the low-pressure chamber 7. At this time, the spring 26 is in a compressed state. During this process, the rising piston 27 will drive the valve stem 9 to move upward, and the first sealing ring 10 will preferentially contact the first sealing ring 12, thereby slowing down the leakage of hydrogen. As the valve stem 9 continues to move upward, the second sealing ring 11 is in contact with the second sealing ring 13. The valve stem 9 is moved upwards to further slow down the leakage of hydrogen. As the hydrogen leaks more, the valve stem 9 rises further. The first sealing ring 10 and the second sealing ring 11 are respectively more closely fitted with the first sealing ring 12 and the second sealing ring, thereby completely preventing the hydrogen from entering the low-pressure chamber 7, thereby reducing the pressure of the hydrogen. At this time, the return spring 16 is in a stretched state. When the low-pressure hydrogen is discharged from the low-pressure chamber 7 through the gas outlet 4, as the air pressure in the low-pressure chamber 7 decreases, the compressed spring 26 and the stretched return spring 16 return to a natural state. In this process, the piston 27 and the valve stem 9 both move downwards, so that the first The sealing ring 10 and the second sealing ring 11 are separated from the first sealing ring 12 and the second sealing ring 13 respectively, so that the high-pressure hydrogen enters the low-pressure chamber 7 through the connecting hole 8 again, and this process is repeated to complete the decompression of the high-pressure hydrogen. In this process, the more high-pressure hydrogen enters the low-pressure chamber 7 through the connecting hole 8, the greater the upward distance of the piston 27, so that the first sealing ring 10 and the second sealing ring 11 on the outer wall of the valve stem 9 fit more closely with the first sealing ring 12 and the second sealing ring 13, thereby further isolating the circulation of the high-pressure hydrogen, thereby solving the problem of slow leakage of the high-pressure hydrogen pressure reducing valve.

[0045] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A double R composite sealing structure, characterized in that: The valve stem comprises a valve stem and a first sealing surface and a second sealing surface which are arranged on the outer side of the valve stem.

2. A double R composite sealing structure according to claim 1, characterized in that: It also includes a first sealing ring, a second sealing ring, a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring are both coaxially arranged with the valve stem, and the first sealing ring is located inside the second sealing ring, the first sealing ring is located inside the second sealing ring, the end face of the first sealing ring is a first sealing face, and the first sealing face can abut against the end face of the first sealing ring, the end face of the second sealing ring is a second sealing face, and the second sealing face can abut against the end face of the second sealing ring.

3. A double R composite sealing structure according to claim 2, characterized in that: The second sealing ring is made of high-strength and high and low temperature resistant sealing material, the first sealing ring is made of high-elasticity and high and low temperature resistant sealing material, the height of the first sealing ring is greater than the height of the second sealing ring, the height of the second sealing ring is greater than the height of the first sealing ring, and the valve stem, the first sealing ring and the second sealing ring are integrally formed.

4. A double R composite sealing structure according to claim 3, characterized in that: The second sealing ring is provided with an installation groove, the first sealing ring is embedded in the installation groove, the inner radius of the second sealing ring is greater than the inner radius of the first sealing ring, and the outer radius of the first sealing ring is greater than the inner radius of the second sealing ring.

5. A high-pressure hydrogen pressure reducing valve according to claim 4, characterized in that: It includes a double R composite sealing structure as described in claim 4.

6. A high-pressure hydrogen pressure reducing valve according to claim 5, characterized in that: It also includes an upper shell and a lower shell. The upper shell is arranged at the upper end of the lower shell. The lower shell is provided with an air inlet, an air outlet, a low-pressure chamber, a high-pressure chamber and an installation chamber. The air inlet and the air outlet are both opened on the outer wall of the lower shell. The installation chamber is opened in the middle of the lower shell. The air inlet and the installation chamber are connected through the high-pressure chamber. The low-pressure chamber is opened at one end of the lower shell close to the upper shell, and the low-pressure chamber is connected to the air outlet. A connecting hole is opened at one end of the lower shell close to the upper shell, and the low-pressure chamber is connected to the installation chamber through the connecting hole. A double R composite sealing structure is arranged in the installation chamber, and a first sealing ring and a second sealing ring are arranged on the inner wall of the upper end of the installation chamber. An adjusting chamber is provided inside the upper shell body, which is connected with the low-pressure chamber. An adjusting assembly is provided in the adjusting chamber, which includes a spring seat, a spring and a piston. The spring seat is provided on the inner wall of the upper end of the adjusting chamber, the spring sleeve is provided on the outer wall of the lower end of the spring seat, the piston is provided on the end of the spring away from the spring seat, and the piston is fitted with the inner wall of the adjusting chamber. The valve stem extends to one end of the low-pressure chamber through a connecting hole and is connected with the end of the piston close to the lower shell body.

7. A high-pressure hydrogen pressure reducing valve according to claim 6, characterized in that: A reset assembly is provided in the installation cavity, and the reset assembly includes a support seat, a reset washer and a reset spring. The support seat is provided in the installation cavity, and a plurality of air holes are equidistantly provided on the outer wall of the support seat, and a slide groove is provided on the support seat, and the valve stem is provided in the slide groove, and the reset washer is provided at one end of the support seat close to the valve stem, and the reset washer is sleeved on the outer wall of the valve stem, and the reset spring is provided between the reset washer and the second sealing ring, and an air guide ring is provided on the inner wall of the installation cavity, and the air guide ring is located on the outer wall of the second sealing ring, and a plurality of ventilation grooves are equidistantly provided on the outer wall of the air guide ring, and a plurality of notches corresponding to the ventilation grooves are equidistantly provided on the outer wall of the second sealing ring.

8. A high-pressure hydrogen pressure reducing valve according to claim 7, characterized in that: A suspension seat is arranged at one end of the piston close to the lower shell body, and a clamping block is arranged at one end of the valve stem close to the upper shell body, and the clamping block is clamped with the suspension seat.

9. A high-pressure hydrogen pressure reducing valve according to claim 8, characterized in that: An adjusting bolt is arranged at one end of the upper shell away from the lower shell, and one end of the adjusting bolt extends to the adjusting cavity and is connected with the spring seat.

10. A high-pressure hydrogen pressure reducing valve according to claim 9, characterized in that: The lower shell is provided with a balancing hole, and the balancing hole is connected with the air outlet and the slide groove.

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