High-temperature high-precision hydrogen pressure reducing valve
By using a two-stage series pressure reducing valve and an active valve core and seat design, combined with a four-layer pressure reducing filter sleeve and a bellows pressure regulating assembly, the problem of unstable downstream pressure under high temperature and high pressure is solved, achieving high-precision pressure stabilization and shortening of axial dimensions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SANMEN NUCLEAR POWER CO LTD
- Filing Date
- 2026-01-26
- Publication Date
- 2026-04-17
AI Technical Summary
Under high temperature and high pressure conditions, existing hydrogen pressure reducing valves suffer from pressure fluctuations before the valve, leading to unstable pressure after the valve and insufficient pressure stabilization accuracy. Furthermore, the traditional structure with separate spring and bellows arrangement results in large axial dimensions and sluggish force transmission.
It adopts a two-stage series pressure reducing valve design, combined with an active valve core and seat and a four-layer pressure reducing filter sleeve. Precise control is achieved through a bellows pressure regulating assembly, and the spring is built into the bellows to reduce hysteresis and friction.
When the upstream pressure fluctuates significantly from 0.5 to 15 MPa, the downstream pressure remains stable within the range of ±0.005 MPa, meeting the requirements for high-precision pressure regulation, adapting to high-temperature and high-pressure operating conditions, shortening the axial dimension by 30%, and improving the adjustment sensitivity and accuracy.
Smart Images
Figure CN121876211A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure reducing valve technology, and more specifically, to a high-temperature, high-precision hydrogen pressure reducing valve. Background Technology
[0002] In hydrogen energy applications such as hydrogen cracking and hydrogenation processes, and nuclear power plant pressurizer exhaust, there is a widespread need to stably reduce the pressure of high-temperature, high-pressure hydrogen. Existing hydrogen pressure reducing valves mainly employ pilot-operated, piston-type, or bellows-type structures. Their operating principle relies on the thrust generated by the monitored downstream pressure on the diaphragm or bellows, which is balanced with the spring's preset force to drive the valve core. However, the following technical problems exist in practical applications: 1. When the pressure before the valve fluctuates significantly, the fluid resistance acting on the valve core will change accordingly, causing unavoidable fluctuations in the pressure after the valve. This makes it impossible to meet the requirements of high-precision pressure stabilization. Specifically, under conditions where the pressure before the valve fluctuates significantly from 0.5 to 15 MPa and the temperature reaches as high as 350°C, the pressure after the valve cannot be stably output.
[0003] 2. In traditional structures, springs and bellows are often arranged separately, resulting in large axial dimensions and sluggish force transmission.
[0004] 3. The valve core and seat structure cannot actively compensate for pressure fluctuations before the valve, resulting in insufficient pressure stabilization accuracy.
[0005] Therefore, a high-temperature, high-precision, pressure-stabilizing and pressure-reducing hydrogen pressure-reducing valve is needed to solve the above problems. Summary of the Invention
[0006] This application provides a high-temperature, high-precision hydrogen pressure reducing valve, which solves the problem that when the upstream pressure fluctuates significantly in practical applications, the fluid resistance acting on the valve core changes accordingly, causing unavoidable fluctuations in the downstream pressure, resulting in unstable downstream pressure output. The valve core and valve seat structure cannot actively compensate for the upstream pressure fluctuations, leading to insufficient pressure stabilization accuracy. Furthermore, in traditional structures, the spring and bellows are mostly arranged separately, resulting in large axial dimensions and hysteresis in force transmission.
[0007] This application provides a high-temperature, high-precision hydrogen pressure reducing valve, including a first-stage pressure reducing valve and a second-stage pressure reducing valve connected in series. Both the first-stage and second-stage pressure reducing valves include a valve body, a four-layer pressure reducing filter sleeve, a valve seat, a valve core that cooperates with the valve seat, and a bellows pressure regulating assembly that drives the valve core to move. The top and bottom of the valve body are respectively fixedly connected to an upper valve cover and a lower valve cover by screws. The valve body is provided with a high-pressure gas source interface and a downstream pipeline interface. The high-pressure gas source interface and the downstream pipeline interface are connected to the medium flow channel inside the valve body. The upper part of the valve body is provided with a pressure reducing chamber, and the bellows pressure regulating assembly is disposed in the pressure reducing chamber. The bellows pressure regulating assembly includes a bellows, a first spring seat, a pressure regulating spring, a pressure regulating bolt, and a second spring seat. One end of the bellows is sealed and fixed inside the upper valve cover. The first spring seat is fixedly disposed inside the bottom end of the bellows. The second spring seat is fixed to the lower end of the pressure regulating bolt. The pressure regulating spring is placed in the inner cavity of the bellows, and its two ends are respectively supported on the first spring seat and the second spring seat. The pressure regulating bolt is threaded to the upper valve cover, and its lower end acts on the upper end of the pressure regulating spring. The bottom of the first spring seat is connected to the valve core. An annular gap is formed at the connection between the upper part of the conical component of the valve core and the valve seat. A preload spring is installed between the lower part of the conical component and the four-layer pressure reducing filter sleeve, which is sleeved on the valve core. The through hole on the four-layer pressure reducing filter sleeve corresponds to the medium flow channel. The medium flow channel is connected to the pressure reducing chamber through the sleeve cover.
[0008] Preferably, the four-layer pressure-reducing filter sleeve is a four-layer coaxial nested integrated structure, consisting of a first-layer pressure-reducing filter sleeve, a second-layer pressure-reducing filter sleeve, a third-layer pressure-reducing filter sleeve, and a fourth-layer pressure-reducing filter sleeve, arranged sequentially from the outside to the inside along the medium flow direction.
[0009] Preferably, the first layer of pressure-reducing filter sleeve has a plurality of first-stage through holes evenly distributed on its circumferential surface, the second layer of pressure-reducing filter sleeve has a number of second-stage through holes evenly distributed in greater quantity than the first-stage through holes, the third layer of pressure-reducing filter sleeve has a plurality of rectangular windows opened along its axial direction, and the fourth layer of pressure-reducing filter sleeve has fourth-stage through holes evenly distributed.
[0010] Preferably, the first-layer pressure-reducing filter sleeve has 45-55 first-stage through holes, and the cavity thickness between it and the second-layer pressure-reducing filter sleeve is 1mm; the second-layer pressure-reducing filter sleeve has 95-115 second-stage through holes, and the cavity thickness between it and the third-layer pressure-reducing filter sleeve is 0.5mm; the third-layer pressure-reducing filter sleeve has 15-25 rectangular windows, and the cavity thickness between it and the fourth-layer pressure-reducing filter sleeve is 0.5mm; the fourth-layer pressure-reducing filter sleeve has 50-70 fourth-stage through holes.
[0011] Preferably, a thrust roller bearing is also connected between one end of the pressure regulating spring and the second spring seat.
[0012] Preferably, a graphite ring is provided between the upper valve cover and the bellows, and an O-ring is provided on the graphite ring.
[0013] Preferably, a protective cap installed on the upper valve cover is fitted over the pressure adjusting bolt.
[0014] Preferably, the graphite ring is provided at the lower part of the four-layer pressure reducing filter sleeve and between the valve seat and the valve body.
[0015] Preferably, a packing component is filled between the lower part of the four-layer pressure reducing filter sleeve and the lower part of the valve core, and a packing bottom pad is provided at the lower end of the packing component.
[0016] Preferably, the graphite ring has a graphite pad at its bottom.
[0017] As can be seen from the above technical solution, this application provides a high-temperature, high-precision hydrogen pressure reducing valve. In use, high-pressure hydrogen enters the medium flow channel within the valve body from the high-pressure gas source interface. It first undergoes preliminary pressure reduction through four layers of pressure-reducing filter sleeves. These four layers are a coaxial, nested, integrated structure, arranged sequentially from the outside to the inside along the medium flow direction: the first layer, the second layer, the third layer, and the fourth layer. The staggered distribution of cavities, through-holes, and windows between each layer helps to achieve multi-stage throttling and inter-layer buffering, thereby smoothly reducing pressure and filtering impurities in the medium. The hydrogen, after preliminary pressure reduction, enters the pressure-reducing chamber. The bellows pressure regulating assembly adjusts the movement of the valve core according to changes in downstream pressure. The bellows senses changes in downstream pressure and adjusts the position of the valve core through the pressure regulating spring and adjusting bolt, thereby controlling the opening of the medium flow channel and achieving precise pressure reduction.
[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through a two-stage series pressure reduction combined with an active valve core and seat design, can stabilize the downstream pressure within the range of ±0.005MPa when the upstream pressure fluctuates significantly from 0.5 to 15MPa, thus meeting the high-precision requirements of high-end scenarios such as nuclear power.
[0019] 2. This invention uses a high-temperature resistant metal bellows and a multi-layer pressure reducing sleeve, which can work stably for a long time under high temperature of 350℃ and high pressure of 15MPa.
[0020] 3. This invention achieves a smooth voltage reduction from high pressure to low pressure through a multi-stage throttling and interlayer buffering design of a four-layer pressure reducing filter sleeve and precise control of the bellows pressure regulating component, thus meeting the requirements for high-precision voltage stabilization.
[0021] 4. This invention, through the design of a specific diameter difference between the valve core guide section and the valve seat inner hole, directly converts the pressure fluctuations before the valve into an unbalanced force acting on the valve core. When the pressure before the valve increases, the unbalanced force increases, enhancing the sealing tendency or requiring a larger spring force to balance it. This achieves active coarse adjustment of the pressure fluctuations before the valve. Combined with the fine adjustment feedback of the bellows, the response is faster and the accuracy is higher.
[0022] 5. This invention integrates the adjusting spring inside the bellows, reducing the axial dimension by more than 30% compared to the traditional split structure, making it suitable for scenarios with limited installation space.
[0023] 6. In this invention, the spring force acts directly on the bellows through the first spring seat, making the force transmission path more direct, reducing the lag and friction of intermediate transmission components, and improving adjustment sensitivity and accuracy.
[0024] 7. The annular gap design between the valve core and the valve seat, as well as the use of multi-layer sealing elements, ensure good sealing performance and prevent hydrogen leakage.
[0025] In summary, a high-temperature, high-precision hydrogen pressure reducing valve, through a two-stage series pressure reducing combined with an active valve core and seat design, can stabilize the downstream pressure within ±0.005MPa when the upstream pressure fluctuates significantly from 0.5 to 15MPa. Through multi-stage throttling and interlayer buffering design with four layers of pressure-reducing filter sleeves, and precise control of the bellows pressure regulating component, it achieves smooth pressure reduction from high to low pressure, meeting the requirements for high-precision pressure stabilization. The regulating spring is built into the bellows, reducing the axial dimension by more than 30% compared to the traditional split structure, making it suitable for installation space-constrained scenarios. The spring force acts directly on the bellows through the internal spring seat, resulting in a more direct force transmission path, reducing hysteresis and friction in intermediate transmission components, and improving regulation sensitivity and accuracy. Attached Figure Description
[0026] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.
[0027] Figure 1 A schematic diagram of the structure of a high-temperature, high-precision hydrogen pressure reducing valve provided by the present invention; Figure 2 This is a schematic diagram of the valve core and valve seat in a high-temperature, high-precision hydrogen pressure reducing valve provided by the present invention. Figure 3 This is a schematic diagram of the structure of a four-layer pressure-reducing filter sleeve in a high-temperature, high-precision hydrogen pressure-reducing valve provided by the present invention. Figure 4 This is a schematic diagram of the structure of the first layer of the four-layer pressure-reducing filter sleeve in a high-temperature and high-precision hydrogen pressure-reducing valve provided by the present invention. Figure 5 This is a schematic diagram of the structure of the second layer of the four-layer pressure-reducing filter sleeve in a high-temperature and high-precision hydrogen pressure-reducing valve provided by the present invention. Figure 6This is a schematic diagram of the structure of the third layer of the four-layer pressure-reducing filter sleeve in a high-temperature and high-precision hydrogen pressure-reducing valve provided by the present invention. Figure 7 This is a schematic diagram of the structure of the fourth layer of the four-layer pressure-reducing filter sleeve in a high-temperature, high-precision hydrogen pressure-reducing valve provided by the present invention.
[0028] The reference numerals in the detailed embodiments are as follows: 1. First-stage pressure reducing valve; 2. Second-stage pressure reducing valve; 3. Valve body; 4. Four-layer pressure reducing filter sleeve; 401. First-layer pressure reducing filter sleeve; 4011. First-stage through hole; 402. Second-layer pressure reducing filter sleeve; 4021. Second-stage through hole; 403. Third-layer pressure reducing filter sleeve; 4031. Rectangular window; 404. Fourth-layer pressure reducing filter sleeve; 4041. Fourth-stage through hole; 5. Valve core; 6. Valve seat; 7. Bellows pressure regulating assembly; 701. Bellows; 702. 703. First spring seat; 704. Pressure adjusting spring; 705. Pressure adjusting bolt; 706. Second spring seat; 8. Pressure reducing chamber; 9. High-pressure gas source interface; 10. Downstream pipeline interface; 11. Preload spring; 12. Medium flow channel; 13. Sleeve gland; 14. Tapered component; 15. Thrust roller bearing; 16. Upper valve cover; 17. Lower valve cover; 18. Graphite gasket; 19. O-ring; 20. Protective cap; 21. Screw; 22. Packing component; 23. Graphite ring; 24. Packing base gasket. Detailed Implementation
[0029] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0030] See Figure 1-7This application discloses a high-temperature, high-precision hydrogen pressure reducing valve. To address the problem that in practical applications, when the upstream pressure fluctuates significantly, the fluid resistance acting on the valve core changes accordingly, leading to unavoidable fluctuations in the downstream pressure and unstable output. The valve core and seat structure cannot actively compensate for upstream pressure fluctuations, resulting in insufficient pressure stabilization accuracy. Furthermore, traditional structures often feature separate spring and bellows arrangements, resulting in large axial dimensions and hysteresis in force transmission. This application proposes a high-temperature, high-precision hydrogen pressure reducing valve that, through a two-stage series pressure reduction combined with an active valve core and seat design, can achieve pressure stabilization accuracy even at upstream pressures of 0.5–1 liters. When the pressure fluctuates significantly from 5MPa, the pressure downstream of the valve is stabilized within ±0.005MPa. Through the multi-stage throttling and interlayer buffering design of the four-layer pressure-reducing filter sleeve, as well as the precise control of the bellows pressure regulating component, a smooth pressure reduction from high pressure to low pressure is achieved, meeting the requirements of high-precision pressure stabilization. The regulating spring is built into the bellows, which shortens the axial dimension by more than 30% compared to the traditional split structure, making it suitable for scenarios with limited installation space. The spring force acts directly on the bellows through the internal spring seat, making the force transmission path more direct, reducing the lag and friction of intermediate transmission components, and improving the regulation sensitivity and accuracy.
[0031] Specifically, a high-temperature, high-precision hydrogen pressure reducing valve includes a first-stage pressure reducing valve 1 and a second-stage pressure reducing valve 2 connected in series. Both the first-stage and second-stage pressure reducing valves include a valve body 3, a four-layer pressure reducing filter sleeve 4, a valve seat 6, a valve core 5 that cooperates with the valve seat 6, and a bellows pressure regulating assembly 7 that drives the valve core 5. An upper valve cover 16 and a lower valve cover 17 are fixedly connected to the top and bottom of the valve body 3 respectively by screws 21. The valve body 3 is provided with a high-pressure gas source interface 9 and a downstream pipeline interface 10. The gas source interface 9 and the downstream pipeline interface 10 are connected to the medium flow channel 12 inside the valve body 3. High-pressure hydrogen enters the medium flow channel 12 inside the valve body 3 from the high-pressure gas source interface 9. The upper part of the valve body 3 is provided with a pressure reducing chamber 8, and the bellows pressure regulating assembly 7 is set in the pressure reducing chamber 8. Through the two-stage series pressure reducing combined with the active valve core 5 and valve seat 6 design, the downstream pressure can be stabilized within the range of ±0.005MPa when the upstream pressure fluctuates greatly from 0.5 to 15MPa, meeting the high precision requirements of high-end scenarios such as nuclear power. The bellows pressure regulating assembly 7 includes a bellows 701, a first spring seat 702, a pressure regulating spring 703, a pressure regulating bolt 704, and a second spring seat 705. One end of the bellows 701 is sealed and fixed inside the upper valve cover 16. The first spring seat 702 is fixedly disposed inside the bottom end of the bellows 701. The second spring seat 705 is fixed to the lower end of the pressure regulating bolt 704. The pressure regulating spring 703 is placed inside the bellows 701. By embedding the pressure regulating spring 703 inside the bellows 701, the axial dimension is shortened by more than 30% compared to the traditional split structure, making it suitable for installations with limited space. In this scenario, the bellows 701 is supported at both ends by the first spring seat 702 and the second spring seat 705, respectively. The bellows 701 is made of high-temperature resistant metal and a multi-layer pressure-reducing sleeve, allowing for long-term stable operation under conditions of 350℃ high temperature and 15MPa high pressure. The pressure-adjusting bolt 704 is threaded onto the upper valve cover 16, with its lower end acting on the upper end of the pressure-adjusting spring 703. The spring force acts directly on the bellows 701 through the first spring seat 702, resulting in a more direct force transmission path. This reduces the lag and friction of intermediate transmission components, improving adjustment sensitivity and accuracy. After preliminary... Depressurized hydrogen gas enters the pressure reducing chamber 8. The bellows pressure regulating assembly 7 adjusts the movement of the valve core 5 according to the downstream pressure change. The bellows 701 senses the downstream pressure change and adjusts the position of the valve core 5 through the pressure regulating spring 703 and the pressure regulating bolt 704, thereby controlling the opening of the medium flow channel 12 to achieve precise pressure reduction. A graphite ring 23 is provided between the upper valve cover 16 and the bellows 701, and an O-ring 19 is provided on the graphite ring 23. The graphite ring 23 and the O-ring 19 provide an additional sealing layer to prevent hydrogen leakage and ensure the safety and reliability of the pressure reducing valve. A thrust roller bearing 15 is also connected between one end of the spring 703 and the second spring seat 705. The thrust roller bearing 15 can reduce the friction of the pressure regulating spring 703 when it is under force, improve its response speed and accuracy, and thus improve the pressure regulating performance of the entire pressure reducing valve. The bottom of the first spring seat 702 is connected to the valve core 5. A protective cap 20 is fitted on the upper valve cover 16 above the pressure regulating bolt 704. The protective cap 20 can prevent dust and foreign objects from entering the bellows pressure regulating assembly 7 and protect the threads from damage, thereby ensuring the long-term stable operation of the bellows pressure regulating assembly 7. An annular gap is formed at the connection between the tapered component 14 of the valve core 5 and the valve seat 6. The diameter difference between the guide section of the valve core 5 and the inner hole of the valve seat 6 is greater in the first-stage pressure reducing valve 1 than in the second-stage pressure reducing valve 2. This causes the pressure fluctuation before the valve to be directly converted into an unbalanced force acting on the valve core 5. When the pressure before the valve increases, the unbalanced force increases, strengthening the sealing tendency or requiring a larger spring force to balance it. This achieves active coarse adjustment of the pressure fluctuation before the valve. Combined with the fine adjustment feedback of the bellows 701, the response is faster and the accuracy is higher. The area below the tapered component 14 and the four-layer pressure reducing passage... A preload spring 11 is installed between the filter sleeves 4 and fitted onto the valve core 5. The annular gap between the upper part of the conical component 14 of the valve core 5 and the valve seat 6, and the preload spring 11 between the lower part and the four-layer pressure-reducing filter sleeve 4, ensure good sealing performance. The through holes on the four-layer pressure-reducing filter sleeve 4 correspond to the medium flow channel 12. After initial pressure reduction through the four-layer pressure-reducing filter sleeve 4, the medium flow channel 12 is connected to the pressure-reducing chamber 8 through the sleeve cover 13. Through the multi-stage throttling and interlayer buffering design of the four-layer pressure-reducing filter sleeve 4, and the precise control of the bellows pressure regulating component 7, pressure reduction from high pressure is achieved. The system achieves a smooth pressure reduction from low pressure, meeting the requirements for high-precision pressure stabilization. The four-layer pressure-reducing filter sleeve 4 is a four-layer coaxial nested integrated structure. From the outside to the inside along the medium flow direction, it consists of the first layer pressure-reducing filter sleeve 401, the second layer pressure-reducing filter sleeve 402, the third layer pressure-reducing filter sleeve 403, and the fourth layer pressure-reducing filter sleeve 404. Hydrogen gas undergoes throttling and buffering as it passes through each layer, thus achieving a smooth pressure reduction process. The staggered distribution of cavities, through-holes, and windows between each layer helps to achieve multi-stage throttling and inter-layer buffering, thereby smoothly reducing pressure and filtering impurities in the medium. The first-layer pressure-reducing filter sleeve 401 has several first-stage through holes 4011 evenly distributed on its circumferential surface. The second-layer pressure-reducing filter sleeve 402 has more second-stage through holes 4021 than the first-stage through holes 4011 evenly distributed on its surface. The third-layer pressure-reducing filter sleeve 403 has several rectangular windows 4031 opened along its axial direction. The fourth-layer pressure-reducing filter sleeve 404 has fourth-stage through holes 4041 evenly distributed on its surface. By controlling the number and distribution of through holes in each layer, the pressure reduction effect of each layer can be precisely adjusted, thereby achieving more precise pressure control throughout the entire pressure reduction process. The first-layer pressure-reducing filter sleeve 401 has 45-55 first-stage through holes 4011, and the cavity thickness between it and the second-layer pressure-reducing filter sleeve 402 is 1mm. The second-layer pressure-reducing filter sleeve 402 has 95-115 second-stage through holes 4021, and the cavity thickness between it and the third-layer pressure-reducing filter sleeve 403 is 0.5mm. The third-layer pressure-reducing filter sleeve 403 has 15-25 rectangular windows 4031, and the cavity thickness between it and the fourth-layer pressure-reducing filter sleeve 404 is 0.5mm. The fourth-layer pressure-reducing filter sleeve 404 has 50-70 fourth-stage through holes 4041. The precise design of the number of through holes and cavity thickness helps to optimize the pressure reduction effect of each layer, ensuring the stability and accuracy of the entire pressure reduction process. This four-layer pressure-reducing filter... Graphite rings 23 are provided at the lower part of the sleeve 4 and between the valve seat 6 and the valve body 3. The graphite rings 23 provide an additional sealing layer. Especially under high temperature and high pressure environments, the high temperature resistance of the graphite rings 23 can ensure the sealing performance of the pressure reducing valve. The lower part of the four-layer pressure reducing filter sleeve 4 and the lower part of the valve core 5 are filled with a packing component 22. The lower end of the packing component 22 is provided with a packing bottom gasket 24. The packing component 22 and the packing bottom gasket 24 provide additional sealing and support to prevent hydrogen leakage and help support the valve core 5 to ensure its stable operation. A graphite gasket 18 is provided at the bottom of the graphite rings 23. The graphite gasket 18 provides an additional sealing layer. Especially at the bottom of the valve body 3, the high temperature and high pressure resistance of the graphite gasket 18 can ensure the long-term stable operation and sealing performance of the pressure reducing valve.
[0032] As can be seen from the above technical solution, a high-temperature, high-precision hydrogen pressure reducing valve achieves high-precision pressure reduction through two valve bodies 3 connected in series. High-pressure hydrogen first enters the first-stage pressure reducing valve 1 through the high-pressure gas source interface 9, and is initially reduced in pressure and filtered of impurities by four layers of pressure reducing filter sleeves 4. Then, it passes through the sealing surface between the valve core 5 and the valve seat 6. The pressure adjusting bolt 704 applies a certain pressure to the pressure adjusting spring 703, which is transmitted to the valve core 5 through the bellows 701. This pressure, together with the pre-compression spring 11 below the conical component 14 of the valve core 5 and the unbalanced force at the valve core 5, contributes to the pressure reduction. The same function maintains a certain opening of the valve core 5 to achieve the first-stage pressure reduction control; the second-stage pressure reducing valve 2 is based on the same principle as the first-stage pressure reducing valve 1, but the design parameters of its internal bellows pressure regulating component 7 are designed for low-pressure reduction conditions, including that the difference between the diameter of the valve core 5 and the diameter of the inner hole of the valve seat 6 is slightly smaller than that of the first-stage pressure reducing valve 1 structure, so as to achieve higher pressure stabilization accuracy; through this two-stage series pressure reducing structure, the present invention can achieve precise control of stable output of the downstream pressure under high temperature and high pressure conditions when the upstream pressure fluctuates greatly.
[0033] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.
[0034] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention.
Claims
1. A high-temperature, high-precision hydrogen pressure reducing valve, characterized in that: The system includes a first-stage pressure reducing valve (1) and a second-stage pressure reducing valve (2) connected in series. Both the first-stage pressure reducing valve (1) and the second-stage pressure reducing valve (2) include a valve body (3), a four-layer pressure reducing filter sleeve (4), a valve seat (6), a valve core (5) that cooperates with the valve seat (6), and a bellows pressure regulating assembly (7) that drives the valve core (5) to move. The top and bottom of the valve body (3) are respectively fixedly connected to an upper valve cover (16) and a lower valve cover (17) by screws (21). The valve body (3) is provided with a high-pressure gas source interface (9) and a downstream pipeline interface (10). The high-pressure gas source interface (9) and the downstream pipeline interface (10) are connected to the medium flow channel (12) inside the valve body (3). The upper part of the valve body (3) is provided with a pressure reducing chamber (8), and the bellows pressure regulating assembly (7) is located inside the pressure reducing chamber (8). The bellows pressure regulating assembly (7) includes a bellows (701), a first spring seat (702), a pressure regulating spring (703), a pressure regulating bolt (704), and a second spring seat (705). One end of the bellows (701) is sealed and fixed inside the upper valve cover (16). The first spring seat (702) is fixedly disposed at the bottom of the bellows (701). The second spring seat (705) is fixed at the lower end of the pressure regulating bolt (704). The pressure regulating spring (703) is placed in the inner cavity of the bellows (701), and its two ends are respectively supported on the first spring seat (702) and the second spring seat (705). The pressure regulating bolt (704) is threaded to the upper valve cover (16), and its lower end acts on the upper end of the pressure regulating spring (703). The bottom of the first spring seat (702) is connected to the valve core (5). An annular gap is formed at the connection between the upper part of the conical component (14) of the valve core (5) and the valve seat (6). A preload spring (11) sleeved on the valve core (5) is installed between the lower part of the conical component (14) and the four-layer pressure reducing filter sleeve (4). The through hole on the four-layer pressure reducing filter sleeve (4) corresponds to the medium flow channel (12). The medium flow channel (12) is connected to the pressure reducing chamber (8) through the sleeve cover (13).
2. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 1, characterized in that: The four-layer pressure-reducing filter sleeve (4) is a four-layer coaxial nested integrated structure, which consists of a first-layer pressure-reducing filter sleeve (401), a second-layer pressure-reducing filter sleeve (402), a third-layer pressure-reducing filter sleeve (403), and a fourth-layer pressure-reducing filter sleeve (404) from the outside to the inside along the medium flow direction.
3. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 2, characterized in that: The first layer pressure reducing filter sleeve (401) has a number of first-stage through holes (4011) evenly distributed on its circumferential surface. The second layer pressure reducing filter sleeve (402) has a number of second-stage through holes (4021) that are more than the number of first-stage through holes (4011) evenly distributed on its surface. The third layer pressure reducing filter sleeve (403) has a number of rectangular windows (4031) opened along its axial direction. The fourth layer pressure reducing filter sleeve (404) has a number of fourth-stage through holes (4041) evenly distributed on its surface.
4. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 3, characterized in that: The first layer pressure-reducing filter sleeve (401) has 45-55 first-stage through holes (4011), and the cavity thickness between it and the second layer pressure-reducing filter sleeve (402) is 1mm. The second layer pressure-reducing filter sleeve (402) has 95-115 second-stage through holes (4021), and the cavity thickness between it and the third layer pressure-reducing filter sleeve (403) is 0.5mm. The third layer pressure-reducing filter sleeve (403) has 15-25 rectangular windows (4031), and the cavity thickness between it and the fourth layer pressure-reducing filter sleeve (404) is 0.5mm. The fourth layer pressure-reducing filter sleeve (404) has 50-70 fourth-stage through holes (4041).
5. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 1, characterized in that: A thrust roller bearing (15) is also connected between one end of the pressure regulating spring (703) and the second spring seat (705).
6. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 1, characterized in that: A graphite ring (23) is provided between the upper valve cover (16) and the bellows (701), and an O-ring (19) is provided on the graphite ring (23).
7. A high-temperature, high-precision hydrogen pressure reducing valve according to claim 1, characterized in that: The pressure adjusting bolt (704) is fitted with a protective cap (20) installed on the upper valve cover (16).
8. The high-temperature, high-precision hydrogen pressure reducing valve according to claim 1, characterized in that: The graphite ring (23) is provided at the lower part of the four-layer pressure reducing filter sleeve (4) and between the valve seat (6) and the valve body (3).
9. A high-temperature, high-precision hydrogen pressure reducing valve according to claim 8, characterized in that: The lower part of the four-layer pressure reducing filter sleeve (4) and the lower part of the valve core (5) are filled with a packing component (22), and a packing bottom pad (24) is provided at the lower end of the packing component (22).
10. A high-temperature, high-precision hydrogen pressure reducing valve according to claim 9, characterized in that: The graphite ring (23) has the graphite pad (18) at its bottom.