Bottle opening valve embedded type pressure reducing device and pressure reducing method thereof
By embedding the pressure reducing valve inside the bottle neck valve, and utilizing the reciprocating motion of the plunger and the Joule-Thomson effect, the problems of large size, heavy weight, and high cost caused by the separate design of the bottle neck valve and the pressure reducing valve are solved, thus achieving safe and stable pressure reduction and gas flow control of high-pressure hydrogen.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-25
- Publication Date
- 2026-04-10
AI Technical Summary
The existing bottle neck valve and pressure reducing valve design results in large size, heavy weight and high cost, and the high-pressure hydrogen is not effectively depressurized before being supplied to hydrogen-using equipment.
Design a bottle-mouth valve embedded pressure reducing device, embedding the pressure reducing valve inside the bottle-mouth valve, controlling the gas pressure through the reciprocating motion of the plunger, achieving stable gas flow and safe pressure reduction, and utilizing the Joule-Thomson effect to increase the valve body temperature.
It achieves a compact structure and cost savings without increasing the external dimensions of the bottle opening, safely reduces the pressure of high-pressure hydrogen, and maintains stable gas outlet pressure through the reciprocating motion of the plunger, reducing the impact of extremely low temperatures on the O-ring.
Smart Images
Figure CN121828490A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a pressure reducing device and method for an embedded bottle neck valve, belonging to the technical field of hydrogen bottle neck valves. Background Technology
[0002] Hydrogen energy is one of the important ways to decarbonize the transportation sector in the future, and high-pressure gaseous hydrogen is currently the main form of airborne hydrogen storage. Hydrogen passes through a cylinder valve into a pressure reducing valve before being supplied to fuel cells or hydrogen internal combustion engines. The cylinder valve integrates functions such as a solenoid valve, a manual on / off valve, and a venting valve. The pressure reducing valve reduces the pressure of the high-pressure hydrogen to a pressure acceptable to the hydrogen-using equipment.
[0003] Currently, bottle neck valves and pressure reducing valves are designed separately or simply placed together, resulting in disadvantages such as large size, heavy weight, and high cost. Summary of the Invention
[0004] The technical problem to be solved by this invention is to provide a pressure reducing device and its pressure reducing method embedded in a bottle neck valve. The valve core component of the pressure reducing device is embedded in the bottle neck valve and shares the valve body with the bottle neck valve. The pressure reducing function is added without changing the external dimensions of the bottle neck, and the pressure reducing method ensures the stability of the gas flow.
[0005] To solve the above problems, the specific technical solution created by this invention is as follows: a pressure reducing device embedded in a bottle valve, wherein a low-pressure chamber for venting is provided on the bottle valve body; a filter and an overflow valve are sequentially provided at the inlet end of the bottle valve body; a pressure reducing valve is provided in the inner cavity at the lower end of the bottle valve body, and the pressure reducing valve is located between the filter outlet and the inlet of the low-pressure chamber; a plunger supported by a pressure reducing valve spring is provided inside the pressure reducing valve; during normal operation, the gas from the filter outlet flows into the low-pressure chamber through the plunger vent hole; when the pressure in the low-pressure chamber is too high, the plunger descends and blocks the filter outlet.
[0006] The pressure reducing valve includes a plunger, a pressure reducing valve spring, a plunger sleeve, and a valve core sealing body. The lower end of the plunger sleeve is connected to the filter, and the outer circumference of the upper end is sealed to the inner cavity of the bottle valve body through a sealing ring. A throttling orifice is provided in the middle of the inner cavity of the plunger sleeve. The inner cavity of the plunger sleeve is sealed to the outer circumference of the lower end of the plunger. The upper end of the plunger has a boss structure, and the outer circumference of the boss is sealed to the inner cavity of the bottle valve body through a sealing ring. The pressure reducing valve spring is located between the lower end face of the boss structure and the upper end face of the plunger sleeve. The valve core sealing body is located at the bottom of the plunger and is sealed to the throttling orifice under the pressure of the pressure reducing valve spring. A plunger vent is provided in the center of the plunger, and several radial air inlets are provided at the lower end of the plunger. The radial air inlets communicate with the plunger vent and are located between the valve core sealing body and the sealing ring at the lower end of the plunger. The upper end of the plunger vent is connected to the low-pressure chamber.
[0007] The plunger sleeve is provided with a limiting platform on its outer circumference. The limiting platform of the plunger sleeve cooperates with the pressure plate and is fixed on the bottle valve body.
[0008] The filter body is externally mounted on the filter, and the upper part of the filter body is connected to the plunger sleeve by threads.
[0009] The filter has an annular cavity between it and the filter body. A flow direction conversion body is provided at the bottom of the filter. The flow direction conversion body has an axial hole at the bottom and several radial holes at the top. The axial hole and the radial holes are connected. Gas is dispersed from the axial hole of the flow direction conversion body to the radial holes and enters from the outer circumference of the filter for filtration.
[0010] The bottom of the filter body is connected to an overflow valve; the overflow valve includes an overflow valve core, an overflow valve cap, and an overflow valve spring; the outer circumference of the overflow valve cap is threadedly connected to the inner circumference of the filter body; the inner circumference of the overflow valve cap is coaxially fitted with the overflow valve core, and the overflow valve core is provided with a boss, which supports the overflow valve spring between the boss and the filter body; a through hole is provided at the center of the bottom surface of the overflow valve cap; a groove is provided at the center of the bottom of the overflow valve core, and a radial through hole is provided at the bottom of the groove, which communicates with the overflow valve spring cavity.
[0011] The bottle valve body is provided with an atmospheric pressure chamber that communicates with the outside; the cavity where the pressure reducing valve spring is located is provided with an oblique hole that communicates with the atmospheric pressure chamber.
[0012] The pressure reduction method based on the bottle valve embedded pressure reduction device includes the following steps: 1) When the pressure reducing valve is not in operation, it is in the upper position and the valve core sealing body is not in contact with the throttling orifice; the gas in the cylinder passes through the overflow valve, filter, radial hole and axial hole below the plunger of the pressure reducing valve in sequence, and finally the gas is discharged from the low pressure chamber outlet. 2) When the pressure in the low-pressure chamber rises to the set pressure, the top surface of the plunger is subjected to force and moves downward against the preload of the pressure reducing valve spring, causing the valve core sealing body to block the throttling orifice, preventing high-pressure gas from flowing into the low-pressure chamber and preventing the downstream pressure from rising above the set pressure of the pressure reducing valve. 3) After the gas at the outlet of the pressure reducing valve is gradually consumed, the pressure in the low-pressure chamber drops. Under the elastic force of the pressure reducing valve spring, the plunger of the pressure reducing valve rises again, thus maintaining the continuous gas supply. The automatic reciprocating motion of the plunger always controls the low-pressure chamber within the set pressure range.
[0013] The pressure-reducing device embedded in the bottle neck valve of this application, employing the above-described structure and pressure-reducing method, has the following advantages: 1. The pressure reducing valve is fully embedded inside the bottle neck valve, resulting in a more compact structure and saving installation space; 2. The pressure reducing valve and the bottle neck valve share the same valve body, saving costs; 3. The high-pressure hydrogen gas has been depressurized before leaving the bottle valve, making it safer; 4. High-pressure hydrogen gas generates a Joule-Thomson heating effect during throttling, which increases the temperature of the O-ring that fits the valve body and reduces the impact of extremely low temperatures. 5. The pressure reduction method of this pressure reducing device is to achieve gas sealing and opening through the reciprocating motion of the plunger, thereby balancing the outlet pressure. Attached Figure Description
[0014] Figure 1 This is a cross-sectional view of a pressure-reducing device embedded in a bottle neck valve.
[0015] Figure 2 This is an enlarged view of the pressure reducing valve.
[0016] Figure 3 This is a schematic diagram of the gas flow path in the pressure reducing device.
[0017] Figure 4 This is a test curve diagram of the pressure reducing device. Detailed Implementation
[0018] like Figure 1 and Figure 2 As shown, a pressure reducing device embedded in a bottle valve has a low-pressure chamber 2 for venting on the bottle valve body 1; a filter 4 and an overflow valve 3 are sequentially arranged at the inlet end of the bottle valve body 1; a pressure reducing valve 5 is arranged in the inner cavity at the lower end of the bottle valve body 1, and the pressure reducing valve 5 is located between the outlet of the filter 4 and the inlet of the low-pressure chamber 2; a plunger 51 supported by a pressure reducing valve spring 52 is arranged inside the pressure reducing valve 5; during normal operation, the gas from the outlet of the filter 4 flows into the low-pressure chamber 2 through the vent hole of the plunger 51; when the pressure in the low-pressure chamber 2 is too high, the plunger 51 descends and blocks the outlet of the filter 4.
[0019] The pressure reducing valve 5 includes a plunger 51, a pressure reducing valve spring 52, a plunger sleeve 53, and a valve core sealing body 54. The lower end of the plunger sleeve 53 is connected to the filter 4, and the outer circumference of its upper end is sealed to the inner cavity of the bottle valve body 1 through a sealing ring. A throttling orifice 55 is provided in the middle of the inner cavity of the plunger sleeve 53. The inner cavity of the plunger sleeve 53 is sealed to the outer circumference of the lower end of the plunger 51. The upper end of the plunger 51 has a boss structure, and the outer circumference of the boss is sealed to the inner cavity of the bottle valve body 1 through a sealing ring. The pressure reducing valve spring 52 is located on the boss. The lower end face of the platform structure is between the upper end face of the plunger sleeve 53 and the lower end face of the plunger sleeve 53. The valve core sealing body 54 is located at the bottom of the plunger 51 and is sealed with the throttle orifice 55 under the pressure of the pressure reducing valve spring 52. A plunger vent hole 56 is provided at the center of the plunger 51, and several radial air inlets are provided at the lower end of the plunger 51. The radial air inlets are connected to the plunger vent hole 56 and are located between the valve core sealing body 54 and the lower end sealing ring of the plunger 51. The upper end of the plunger vent hole 56 is connected to the low-pressure chamber 2. A limiting platform is provided on the outer circumference of the plunger sleeve 53. The limiting platform of the plunger sleeve 53 is matched with the pressure plate 6 and fixed on the bottle valve body 1. The position of the plunger sleeve 53 is fixed. When the upper and lower pressure of the plunger 51 changes, it moves. The sealing ring at the lower end of the plunger 51 is always sealed with the plunger sleeve 53, and the sealing ring at the upper end is always sealed with the inner cavity of the bottle valve body 1.
[0020] The filter 4 is externally provided with a filter body 41, and the upper part of the filter body 41 is connected to the plunger sleeve 53 by threads.
[0021] The filter 4 and the filter body 41 have an annular cavity. A flow conversion body 42 is provided at the bottom of the filter 4. The flow conversion body 42 has an axial hole at the bottom and several radial holes at the top. The axial hole and the radial holes are connected. Gas is dispersed from the axial hole of the flow conversion body 42 to the radial holes and enters from the outer circumference of the filter 4 for filtration.
[0022] The bottom of the filter body 41 is connected to an overflow valve 3. The overflow valve 3 includes an overflow valve core 31, an overflow valve cap 32, and an overflow valve spring 33. The outer circumference of the overflow valve cap 32 is threadedly connected to the inner circumference of the filter body 41. The inner circumference of the overflow valve cap 32 is coaxially fitted with the overflow valve core 31. The overflow valve core 31 has a boss, which supports the overflow valve spring 33 between the boss and the filter body 41. A through hole is provided at the center of the bottom surface of the overflow valve cap 32. A groove is provided at the center of the bottom of the overflow valve core 31, and a radial through hole is provided at the bottom of the groove, which communicates with the cavity of the overflow valve spring 33. The function of the overflow valve is to limit the leakage value to a minimum flow rate when the downstream pipeline ruptures and the flow rate exceeds the rated value of the overflow valve, thereby reducing the harm.
[0023] Because the spring chamber needs to maintain a stable pressure, only in this way can the output pressure be guaranteed to be stable. The bottle valve body 1 is provided with an atmospheric pressure chamber 8 that communicates with the outside; the cavity where the pressure reducing valve spring 52 is located is provided with an oblique hole 7 that communicates with the atmospheric pressure chamber 8, thereby ensuring that the pressure in the spring chamber is always equal to the atmospheric pressure, thus achieving pressure stability.
[0024] The pressure reduction method based on the bottle valve embedded pressure reduction device includes the following steps: 1) When the pressure reducing valve 5 is not in operation, it is in the upper position, and the valve core sealing body 54 is not in contact with the throttling orifice 55; the gas in the cylinder passes through the overflow valve 3 in sequence, enters the flow direction conversion body 42, which changes the flow direction from axial to radial, then flows through the filter body 41 to filter impurities, and then changes the flow direction from radial to axial again. The gas flow direction is as follows: Figure 3 As shown; 2) As hydrogen flows through the throttling orifice 55, the pressure decreases and the temperature rises under the Joule-Thomson effect, which in turn increases the working temperature of the O-ring on the valve body 1, reducing the risk of the O-ring being exposed to extremely low temperatures. 3) When the pressure in the low-pressure chamber 2 rises to the set pressure, the top surface of the plunger 51 is subjected to force and moves downward against the preload of the pressure reducing valve spring 52, so that the valve core sealing body 54 blocks the throttle orifice, preventing high-pressure gas from flowing into the low-pressure chamber and preventing the downstream pressure from rising above the set pressure of the pressure reducing valve. 4) After the gas at the outlet of the pressure reducing valve body 1 is gradually consumed, the pressure in the low-pressure chamber 2 drops. Under the elastic force of the pressure reducing valve spring 52, the plunger 51 of the pressure reducing valve 5 rises again, thus maintaining the continuous gas supply. The plunger 51 automatically reciprocates, always controlling the low-pressure chamber 2 within the set pressure range.
[0025] like Figure 4 As shown, Shanghai Motor Vehicle Inspection and Certification Technology Research Center Co., Ltd. conducted product testing on the pressure reducing valve of this application, and the results showed that the product output pressure was stable and the temperature increased.
Claims
1. A pressure-reducing device with an embedded bottle neck valve, characterized in that: A low-pressure chamber (2) for venting is provided on the bottle valve body (1); a filter (4) and an overflow valve (3) are provided in sequence at the inlet end of the bottle valve body (1); a pressure reducing valve (5) is provided in the inner cavity at the lower end of the bottle valve body (1), and the pressure reducing valve (5) is located between the outlet of the filter (4) and the inlet of the low-pressure chamber (2); a plunger (51) supported by a pressure reducing valve spring (52) is provided inside the pressure reducing valve (5); during normal operation, the gas at the outlet of the filter (4) flows into the low-pressure chamber (2) through the vent hole of the plunger (51); when the pressure in the low-pressure chamber (2) is too high, the plunger (51) descends to block the outlet of the filter (4).
2. The pressure reducing device embedded in the bottle neck valve according to claim 1, characterized in that: The pressure reducing valve (5) includes a plunger (51), a pressure reducing valve spring (52), a plunger sleeve (53), and a valve core sealing body (54); the lower end of the plunger sleeve (53) is connected to the filter (4), and the outer circumference of the upper end is sealed to the inner cavity of the bottle valve body (1) through a sealing ring. A throttling orifice (55) is provided in the middle of the inner cavity of the plunger sleeve (53); the inner cavity of the plunger sleeve (53) is sealed to the outer circumference of the lower end of the plunger (51), and the upper end of the plunger (51) is a boss structure. The outer circumference of the boss is sealed to the inner cavity of the bottle valve body (1) through a sealing ring; the pressure reducing valve spring (52) is positioned... Between the lower end face of the boss structure and the upper end face of the plunger sleeve (53); the valve core sealing body (54) is located at the bottom of the plunger (51) and is sealed with the throttle hole (55) under the pressure of the pressure reducing valve spring (52); a plunger vent hole (56) is provided in the center of the plunger (51), and several radial air inlets are provided at the lower end of the plunger (51). The radial air inlets are connected to the plunger vent hole (56), and the radial air inlets are located between the valve core sealing body (54) and the lower end sealing ring of the plunger (51); the upper end of the plunger vent hole (56) is connected to the low pressure chamber (2).
3. The pressure reducing device embedded in the bottle neck valve according to claim 2, characterized in that: The plunger sleeve (53) has a limiting platform on its outer circumference. The limiting platform of the plunger sleeve (53) cooperates with the pressure plate (6) and is fixed on the bottle valve body (1).
4. The pressure reducing device embedded in the bottle neck valve according to claim 2, characterized in that: The filter (4) has a filter body (41) on its outside, and the upper part of the filter body (41) is connected to the plunger sleeve (53) by threads.
5. The pressure-reducing device embedded in the bottle neck valve according to claim 3, characterized in that: There is an annular cavity between the filter (4) and the filter body (41). A flow conversion body (42) is provided at the bottom of the filter (4). An axial hole is provided at the bottom of the flow conversion body (42), and several radial holes are provided at the top. The axial hole and the radial hole are connected. Gas is dispersed from the axial hole of the flow conversion body (42) to the radial hole and enters from the outer circumference of the filter (4) for filtration.
6. The pressure reducing device embedded in the bottle neck valve according to claim 4, characterized in that: The bottom of the filter body (41) is connected to the overflow valve (3); the overflow valve (3) includes an overflow valve core (31), an overflow valve cap (32) and an overflow valve spring (33); the outer circumference of the overflow valve cap (32) is threadedly connected to the inner circumference of the filter body (41); the inner circumference of the overflow valve cap (32) is coaxially fitted with the overflow valve core (31), the overflow valve core (31) is provided with a boss, and the boss and the filter body (41) support the overflow valve spring (33); a through hole is provided at the center of the bottom surface of the overflow valve cap (32); a groove is provided at the center of the bottom of the overflow valve core (31), and a radial through hole is provided at the bottom of the groove, which communicates with the cavity of the overflow valve spring (33).
7. The pressure reducing device for the embedded bottle neck valve according to claim 2, characterized in that: The bottle valve body (1) is provided with an atmospheric pressure chamber (10) that communicates with the outside; an oblique hole (7) is provided in the cavity where the pressure reducing valve spring (52) is located, which communicates with the atmospheric pressure chamber (8).
8. A pressure reduction method based on the pressure reduction device embedded in the bottle neck valve according to claim 2, characterized in that... Includes the following steps: 1) When the pressure reducing valve (5) is not in operation, it is in the upper position and the valve core sealing body (54) is not in contact with the throttle orifice (55); the gas in the gas cylinder passes through the overflow valve (3), the filter (4), the radial hole and axial hole below the plunger (51) of the pressure reducing valve (5) in sequence, and finally the gas is discharged from the outlet of the low pressure chamber (2). 2) When the pressure in the low-pressure chamber (2) rises to the set pressure, the top surface of the plunger (51) is subjected to force and moves downward against the preload of the pressure reducing valve spring (52), so that the valve core sealing body (54) blocks the throttle hole, preventing high-pressure gas from flowing into the low-pressure chamber and preventing the downstream pressure from rising above the set pressure of the pressure reducing valve. 3) After the gas at the outlet of the waiting valve body (1) is gradually consumed, the pressure in the low-pressure chamber (2) drops. The plunger (51) of the pressure reducing valve (5) rises again under the elastic force of the pressure reducing valve spring (52), thus maintaining the continuous gas supply. The plunger (51) automatically reciprocates, always controlling the low-pressure chamber (2) within the set pressure range.