阅读说明：本技术 一种能保持流量和出口压力稳定的氢气减压阀及其方法 (Hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable and method thereof ) 是由 *** 王春鹏 李纯杰 郑水英 毛炜炜 于 2020-06-04 设计创作，主要内容包括：本发明公开了一种能保持流量和出口压力稳定的氢气减压阀及其方法,减压阀的阀体从上到下依次同轴装配调节封盖、顶杆、阀芯和入口封盖。阀体侧壁开设阀体出口,阀芯底部设有控制尖端,在非工作状态下阀芯底部的控制尖端将控制通道封闭。控制尖端与顶部凹槽之间的空隙为中间通道,阀芯中设有第一气体通道,调节封盖远离阀体的一端同轴连接有螺纹杆。调节封盖与盘状头部之间留有第二气体通道,盘状头部开设有贯通的第三气体通道。本发明的减压阀结构简单、可靠性高、使用寿命长,当减压阀气体入口处的压力随储氢量减少而降低时,能保持出口处流量和压力的稳定,当减压阀气体入口处的压力由于外界原因变大时,同样能保持出口处流量和压力的稳定。(The invention discloses a hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable and a method thereof. The side wall of the valve body is provided with a valve body outlet, the bottom of the valve core is provided with a control tip, and the control tip at the bottom of the valve core seals the control channel in a non-working state. The gap between the control tip and the top groove is a middle channel, a first gas channel is arranged in the valve core, and one end of the adjusting seal cover, which is far away from the valve body, is coaxially connected with a threaded rod. A second gas channel is reserved between the adjusting seal cover and the disc-shaped head, and the disc-shaped head is provided with a through third gas channel. The pressure reducing valve has the advantages of simple structure, high reliability and long service life, can keep the flow and the pressure at the outlet stable when the pressure at the gas inlet of the pressure reducing valve is reduced along with the reduction of the hydrogen storage amount, and also can keep the flow and the pressure at the outlet stable when the pressure at the gas inlet of the pressure reducing valve is increased due to external reasons.)

1. A hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable is characterized by comprising a valve body (1), an adjusting sealing cover (3), a push rod (6), a valve core (7) and an inlet sealing cover (8); along the vertical direction, the valve body (1) is coaxially assembled with an adjusting seal cover (3), an ejector rod (6), a valve core (7) and an inlet seal cover (8) from top to bottom in sequence; the valve body (1) is axially provided with a cavity in a through manner, the side wall of the valve body is provided with a valve body outlet (12), and the exhaust end of the valve body outlet (12) is provided with a connecting structure for connecting with an external air outlet pipeline; the adjusting sealing cover (3) is assembled at the top end of the valve body (1), the joint is closed, the inlet sealing cover (8) is assembled at the bottom end of the valve body (1), and the joint is closed;

an inlet channel (9), a control channel and a top groove which are communicated in sequence are formed in the inlet sealing cover (8), one end, far away from the valve body (1), of the inlet sealing cover (8) is provided with a connecting structure used for being connected with an external air inlet pipeline, and the inlet channel (9) is used for air inlet of a pressure reducing valve;

the valve core (7) is arranged in a cavity of the valve body (1), a control tip end is arranged at the bottom of the valve core (7), the lower part of the valve core (7) extends into a top groove of the inlet sealing cover (8), the side wall of the valve core and the top groove form sealing, and the control tip end at the bottom of the valve core (7) is pressed at an outlet of the control channel in a non-working state to seal the control channel; the gap between the control tip and the top groove is a middle channel (10), and the middle channel (10) can be communicated with the inlet channel (9) through the control channel; a first gas channel is arranged in the valve core (7) and communicated with the middle channel (10);

one end, far away from the valve body (1), of the adjusting sealing cover (3) is coaxially connected with a threaded rod (2), the threaded rod (2) and the adjusting sealing cover (3) are respectively and axially provided with a first pore channel and a second pore channel, and the first pore channel and the second pore channel are communicated with each other; one end of the threaded rod (2) far away from the adjusting seal cover (3) is provided with a connecting structure used for being connected with an external air outlet pipeline;

the ejector rod (6) is arranged in a cavity of the valve body (1) and comprises a disc-shaped head part and a rod part which are connected with each other, the rod part penetrates through the second pore channel and extends into the first pore channel, the height of the rod part does not exceed the first pore channel, an adjusting channel (11) is reserved at the upper part of the first pore channel, the contact part of the rod part, the adjusting sealing cover (3) and the threaded rod (2) keeps air tightness, and the rod part can slide up and down along the first pore channel and the second pore channel;

a first spring (5a) is arranged between the adjusting sealing cover (3) and the disc-shaped head, the rod part is sleeved with the first spring (5a), a second gas channel is reserved between the adjusting sealing cover (3) and the disc-shaped head, and the second gas channel is communicated with the valve body outlet (12); the disc-shaped head is in contact with the top of the valve core (7), the disc-shaped head is provided with a third through gas channel, and the first gas channel is communicated with the second gas channel through the third gas channel;

a second spring (5b) is arranged between the inlet sealing cover (8) and the disc-shaped head part, and the second spring (5b) is sleeved outside the valve core (7); the disc-shaped head and the valve core (7) are in a pressing state respectively through acting forces of a first spring (5a) and a second spring (5b), and the valve core (7) can drive the ejector rod (6) to vertically move up and down along the cavity of the valve body (1).

2. The hydrogen pressure reducing valve according to claim 1, wherein the adjusting cover (3) and the valve body (1), the inlet cover (8) and the valve body (1), and the adjusting cover (3) and the threaded rod (2) are all assembled in a threaded manner.

3. The hydrogen pressure reducing valve according to claim 1, wherein a first sealing ring (4a) is arranged at the contact position of the bottom of the pore channel of the threaded rod (2) and the rod part of the ejector rod (6) for sealing; and a second sealing ring (4b) is arranged at the fixed position of the adjusting sealing cover (3) and the valve body (1) for sealing.

4. The hydrogen pressure reducing valve according to claim 1, wherein a third sealing ring (4c) is arranged at the contact position of the valve core (7) and the valve body (1), and the position of the third sealing ring (4c) is higher than that of the middle channel (10), so that the gas completely enters the first gas channel after passing through the middle channel (10); and a fourth sealing ring (4d) is arranged at the contact position of the valve core (7) and the top groove of the inlet sealing cover (8), and the position of the fourth sealing ring (4d) is higher than the control tip.

5. The hydrogen pressure reducing valve according to claim 1, wherein the bottom of the regulating cover (3) is provided with an upward recessed channel along a radial direction, and a central axis of the recessed channel is parallel to a central axis of the valve body outlet (12) so as to increase a cross-sectional area of the second gas channel to allow smooth gas flow.

6. The hydrogen pressure reducing valve according to claim 1, wherein the third gas passage of the disk-shaped head is plural.

7. The hydrogen pressure reducing valve according to claim 1, wherein the first gas passage is of an inverted T shape including a vertical gas passage and a horizontal gas passage; the vertical gas channel is communicated with the third gas channel, and the horizontal gas channel penetrates through the control tip of the valve core (7) and is communicated with the middle channel (10).

8. The hydrogen pressure reducing valve according to claim 1, wherein the connecting structure is a threaded structure.

9. The hydrogen pressure reducing valve according to claim 1, wherein the control tip has a tapered structure.

10. A method for maintaining the outlet flow rate and pressure of the hydrogen pressure reducing valve as claimed in any one of claims 1 to 9, comprising the steps of:

1) when hydrogen is not introduced into the pressure reducing valve, the first spring (5a) and the second spring (5b) are both in a compressed state due to the action of gravity, and the control channel is closed by the control tip end of the valve core (7);

2) when the device works, an external hydrogen pipeline is respectively connected with a connecting structure of the threaded rod (2) and the inlet sealing cover (8), hydrogen with the same pressure is introduced into the adjusting channel (11) and the inlet channel (9), the control tip end of the valve core (7) moves upwards under the pushing of the hydrogen introduced into the inlet channel (9), and the control channel is opened to enable the inlet channel (9) to be communicated with the middle channel (10); the hydrogen introduced from the inlet channel (9) passes through the control channel, the middle channel (10), the first gas channel, the third gas channel and the second gas channel in sequence and is finally discharged from the valve body outlet (12); the hydrogen introduced from the regulating channel (11) is not communicated with the hydrogen introduced from the inlet channel (9), and only has downward acting force on the ejector rod (6);

3) when the pressure of the introduced hydrogen is reduced, the flow rate and the pressure of the hydrogen at the outlet (12) of the valve body tend to be reduced; at the moment, the acting force of the hydrogen introduced into the adjusting channel (11) on the ejector rod (6) is reduced, the cross-sectional area of a gap between the control tip of the valve core (7) and the control channel is increased, and the hydrogen flow and pressure at the valve body outlet (12) tend to be increased; the two trends counteract each other, so that the hydrogen flow and pressure at the valve body outlet (12) are kept relatively stable;

4) when the pressure of the introduced hydrogen is increased, the flow rate and the pressure of the hydrogen at the outlet (12) of the valve body tend to be increased; at the moment, the acting force of the hydrogen introduced into the adjusting channel (11) on the ejector rod (6) is increased, the cross-sectional area of a gap between the control tip of the valve core (7) and the control channel is reduced, and the hydrogen flow and pressure at the valve body outlet (12) tend to be reduced; the two trends cancel each other out so that the hydrogen flow and pressure at the valve body outlet (12) remain relatively steady.

Technical Field

The invention relates to a pressure reducing valve device, in particular to a hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable and a method thereof.

Background

With the increasing expansion of the hydrogen energy industry, the selectivity of a large number of parts related to hydrogen media is greatly increased while the hydrogen energy is developed in a large scale, but the safety of the hydrogen is ensured to be an inevitable factor when the hydrogen is used as a flammable and explosive substance. In the field of hydrogen energy, the storage and utilization of high-pressure hydrogen are the most economical and reasonable utilization modes in the current technical state, and a large number of use verifications are obtained, and a pressure reducing valve is needed for accurately controlling the pressure and the flow of the high-pressure hydrogen to be stable to the pressure and the flow suitable for a specific device in the use process of the high-pressure hydrogen.

The pressure reduction principle of the hydrogen pressure reducing valve is that when hydrogen passes through a narrow section, a throttling effect is generated, the temperature of the hydrogen is increased, the pressure is reduced, and the flow and the outlet pressure of the hydrogen can be adjusted by adjusting the area of the narrow section.

However, the conventional hydrogen pressure reducing valve cannot keep the flow and pressure of outlet gas stable, and when the pressure of introduced hydrogen changes, the pressure and flow of the gas at the outlet change accordingly. This may result in a reduction in stability and a reduction in service life of the hydrogen pressure reducing valve.

Disclosure of Invention

The present invention is directed to overcoming the disadvantages of the prior art and providing a hydrogen pressure reducing valve and a method thereof that can maintain a stable flow rate and outlet pressure.

The invention adopts the following specific technical scheme:

a hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable comprises a valve body, an adjusting sealing cover, an ejector rod, a valve core and an inlet sealing cover; the valve body is coaxially assembled with an adjusting sealing cover, an ejector rod, a valve core and an inlet sealing cover from top to bottom in sequence along the vertical direction; the valve body is axially provided with a cavity in a through manner, the side wall of the valve body is provided with a valve body outlet, and one exhaust end of the valve body outlet is provided with a connecting structure used for being connected with an external air outlet pipeline; the adjusting sealing cover is assembled at the top end of the valve body, the joint is closed, the inlet sealing cover is assembled at the bottom end of the valve body, and the joint is closed;

an inlet channel, a control channel and a top groove which are communicated in sequence are formed in the inlet sealing cover, a connecting structure used for being connected with an external air inlet pipeline is arranged at one end, away from the valve body, of the inlet sealing cover, and the inlet channel is used for air inlet of the pressure reducing valve;

the valve core is arranged in a cavity of the valve body, the bottom of the valve core is provided with a control tip, the lower part of the valve core extends into the top groove of the inlet sealing cover, the side wall of the valve core and the top groove form sealing, and the control tip at the bottom of the valve core is pressed at an outlet of the control channel in a non-working state to seal the control channel; the gap between the control tip and the top groove is a middle channel, and the middle channel can be communicated with the inlet channel through the control channel; a first gas channel is arranged in the valve core and communicated with the middle channel;

one end of the adjusting seal cover, which is far away from the valve body, is coaxially connected with a threaded rod, the threaded rod and the adjusting seal cover are axially provided with a first pore channel and a second pore channel respectively, and the first pore channel and the second pore channel are communicated with each other; one end of the threaded rod, which is far away from the adjusting seal cover, is provided with a connecting structure used for being connected with an external air outlet pipeline;

the ejector rod is arranged in the cavity of the valve body and comprises a disc-shaped head part and a rod part which are connected with each other, the rod part penetrates through the second pore channel and extends into the first pore channel, the height of the rod part does not exceed the first pore channel, an adjusting channel is reserved at the upper part of the first pore channel, the contact part of the rod part and the adjusting sealing cover and the threaded rod keeps air tightness, and the rod part can slide up and down along the first pore channel and the second pore channel;

a first spring is arranged between the adjusting sealing cover and the disc-shaped head, the rod part is sleeved with the first spring, a second gas channel is reserved between the adjusting sealing cover and the disc-shaped head, and the second gas channel is communicated with the outlet of the valve body; the disc-shaped head is in contact with the top of the valve core, the disc-shaped head is provided with a third through gas channel, and the first gas channel is communicated with the second gas channel through the third gas channel;

a second spring is arranged between the inlet seal cover and the disc-shaped head part and sleeved outside the valve core; the disc-shaped head and the valve core are in a pressing state respectively through the acting force of the first spring and the acting force of the second spring, and the valve core can drive the ejector rod to vertically move up and down along the cavity of the valve body together.

Preferably, the adjusting seal cover and the valve body, the inlet seal cover and the valve body, and the adjusting seal cover and the threaded rod are all in threaded connection.

Preferably, a first sealing ring is arranged at the contact position of the bottom of the pore channel of the threaded rod and the rod part of the ejector rod and used for sealing; and a second sealing ring is arranged at the fixed position of the adjusting sealing cover and the valve body and used for sealing.

Preferably, a third sealing ring is arranged at the contact position of the valve core and the valve body, and the position of the third sealing ring is higher than that of the middle channel, so that the gas completely enters the first gas channel after passing through the middle channel; and a fourth sealing ring is arranged at the contact position of the valve core and the top groove of the inlet sealing cover, and the position of the fourth sealing ring is higher than the position of the control tip.

Preferably, the bottom of the adjusting seal cover is provided with an upward concave channel along the radial direction, and the central axis of the concave channel is parallel to the central axis of the valve body outlet, so that the cross-sectional area of the second gas channel is enlarged, and the gas flows smoothly.

Preferably, the disc-shaped head has a plurality of third gas passages.

Preferably, the first gas channel is of an inverted T shape and comprises a vertical gas channel and a horizontal gas channel; the vertical gas channel is communicated with the third gas channel, and the horizontal gas channel penetrates through the control tip end of the valve core and is communicated with the middle channel.

Preferably, the connection structure is a threaded structure.

Preferably, the control tip is of a conical configuration.

A method for maintaining the outlet flow and pressure of the hydrogen pressure reducing valve stable, which comprises the following steps:

1) when hydrogen is not introduced into the pressure reducing valve, the first spring and the second spring are both in a compressed state due to the action of gravity, and the control channel is closed by the control tip end of the valve core;

2) when the valve core works, an external hydrogen pipeline is respectively connected with the connecting structure of the threaded rod and the inlet sealing cover, hydrogen with the same pressure is introduced into the regulating channel and the inlet channel, the control tip end of the valve core moves upwards under the pushing of the hydrogen introduced into the inlet channel, and the control channel is opened to communicate the inlet channel with the middle channel; the hydrogen introduced from the inlet channel sequentially passes through the control channel, the middle channel, the first gas channel, the third gas channel and the second gas channel, and is finally discharged from the valve body outlet; the hydrogen introduced from the regulating channel is not communicated with the hydrogen introduced from the inlet channel and only has downward acting force on the ejector rod;

3) when the pressure of the introduced hydrogen is reduced, the flow rate and the pressure of the hydrogen at the outlet of the valve body tend to be reduced; at the moment, the acting force of the hydrogen introduced into the adjusting channel on the ejector rod is reduced, the cross section area of a gap between the control tip end of the valve core and the control channel is increased, and the hydrogen flow and the pressure at the outlet of the valve body tend to be increased; the two trends are mutually offset, so that the hydrogen flow and the pressure at the outlet of the valve body are kept in a relatively stable state;

4) when the pressure of the introduced hydrogen is increased, the flow rate and the pressure of the hydrogen at the outlet of the valve body tend to be increased; at the moment, the acting force of the hydrogen introduced into the adjusting channel on the ejector rod is increased, the cross-sectional area of a gap between the control tip end of the valve core and the control channel is reduced, and the hydrogen flow and the pressure at the outlet of the valve body tend to be reduced; the two trends cancel each other out so that the hydrogen flow and pressure at the valve body outlet remain relatively stable.

Compared with the prior art, the invention has the following beneficial effects:

1) the pressure reducing valve has the advantages of simple structure, high reliability and long service life;

2) when the pressure at the gas inlet of the pressure reducing valve is reduced along with the reduction of the hydrogen storage amount, the flow and the pressure at the outlet can be kept stable;

3) when the pressure at the gas inlet of the pressure reducing valve becomes higher due to external reasons, the flow and the pressure at the outlet can be kept stable.

Drawings

FIG. 1 is a schematic perspective view of a pressure relief valve according to the present invention;

FIG. 2 is a cross-sectional view of section A-A of FIG. 1;

FIG. 3 is a schematic perspective view of a threaded rod, an adjusting cover, a push rod and a valve core in the pressure reducing valve of the present invention;

FIG. 4 is a perspective view of a valve body and inlet closure in the pressure relief valve of the present invention.

The reference numbers in the figures are: the valve comprises a valve body 1, a threaded rod 2, an adjusting seal cover 3, a first seal ring 4a, a second seal ring 4b, a third seal ring 4c, a fourth seal ring 4d, a first spring 5a, a second spring 5b, a mandril 6, a valve core 7, an inlet seal cover 8, an inlet channel 9, a middle channel 10, an adjusting channel 11 and a valve body outlet 12.

Detailed Description

The invention is described in further detail below with reference to the figures and embodiments, it being noted that the embodiments described below are intended to facilitate the understanding of the invention without limiting it in any way.

As shown in fig. 1 to 4, the hydrogen pressure reducing valve capable of keeping flow and outlet pressure stable includes a valve body 1, an adjusting cover 3, a plunger 6, a valve core 7, and an inlet cover 8. Along the vertical direction, valve body 1 assembles regulation closing cap 3, ejector pin 6, case 7 and entry closing cap 8 from top to bottom in proper order. The central axes of the valve body 1, the adjusting seal cover 3, the mandril 6, the valve core 7 and the inlet seal cover 8 are superposed, namely all the components are coaxially assembled.

The valve body 1 is provided with a cavity along the axial direction in a through mode, the side wall of the valve body 1 is provided with a valve body outlet 12, the valve body outlet 12 is a pipe section, the last exhaust end of the pipe section is provided with a connecting structure used for being connected with an external gas outlet pipeline, and the connecting structure can be an internal thread structure and used for being fixedly connected with the external pipeline through threads. The adjusting seal cover 3 is assembled at the top end of the valve body 1, the adjusting seal cover 3 is in threaded connection with the valve body 1, and a second seal ring 4b is arranged at the fixed position of the adjusting seal cover 3 and the valve body 1 and used for sealing. The inlet sealing cover 8 is assembled at the bottom end of the valve body 1, the inlet sealing cover 8 is in threaded connection with the valve body 1, and the joint is closed.

An inlet channel 9, a control channel and a top groove which are communicated in sequence are formed in the inlet sealing cover 8, and the inlet channel 9 is used for air inlet of the pressure reducing valve. The end of the inlet cover 8, which is far away from the valve body 1, is provided with a connecting structure for connecting with an external air inlet pipeline, and the connecting structure can be a threaded structure and is fixed with the external pipeline through threaded connection.

The valve core 7 is arranged in the cavity of the valve body 1, and the bottom of the valve core 7 is provided with a control tip, the diameter of the control tip is gradually reduced, and the control tip can be in a conical shape, a hemispherical shape and the like. The lower part of the valve core 7 extends into the top groove of the inlet sealing cover 8, the side wall and the top groove form sealing, the sealing can adopt a mode of additionally arranging a fourth sealing ring 4d, and the position of the fourth sealing ring 4d is higher than the control tip of the valve core 7. And in a non-working state, the control tip at the bottom of the valve core 7 is pressed at the outlet of the control channel to seal the control channel. The space between the control tip and the top recess is a middle channel 10, through which the middle channel 10 can communicate with the inlet channel 9 when the control tip is open. The valve core 7 is provided with a first gas channel which is communicated with the middle channel 10. The contact position of the valve core 7 and the valve body 1 is provided with a third sealing ring 4c, and the position of the third sealing ring 4c is higher than the middle channel 10, so that the gas completely enters the first gas channel after passing through the middle channel 10. In practical application, the first gas passage may be an inverted T-shape, and includes a vertical gas passage and a horizontal gas passage, the vertical gas passage is communicated with the third gas passage, and the horizontal gas passage penetrates through the control tip of the valve element 7 and is communicated with the middle passage 10. In addition, the first gas channel may be provided as a channel of other shapes as desired.

The end, far away from the valve body 1, of the adjusting sealing cover 3 is coaxially connected with a threaded rod 2, the threaded rod 2 can be connected in a threaded mode, a through first hole channel is axially formed in the threaded rod 2, a through second hole channel is axially formed in the adjusting sealing cover 3, and the first hole channel and the second hole channel are mutually communicated. The contact position of the bottom of the pore channel of the threaded rod 2 and the rod part of the ejector rod 6 is provided with a first sealing ring 4a for sealing. One end of the threaded rod 2, which is far away from the adjusting seal cover 3, is provided with a connecting structure which is used for being connected with an external air outlet pipeline, and the connecting structure can be a threaded structure and is used for being fixedly connected with the external pipeline in a threaded manner.

The ejector rod 6 is arranged in the cavity of the valve body 1, and the ejector rod 6 comprises a disc-shaped head part and a rod part which are connected with each other. The rod part of the ejector rod 6 penetrates through the second pore channel from bottom to top and extends into the first pore channel, and the height of the rod part does not exceed the first pore channel, namely an adjusting channel 11 is reserved at the upper part of the first pore channel. And the contact part of the rod part and the adjusting cover 3 and the threaded rod 2 keeps air tightness, and the rod part can slide up and down along the first duct and the second duct in a piston type.

A first spring 5a is arranged between the adjusting seal cover 3 and the disc-shaped head, the rod part is sleeved with the first spring 5a, a second gas channel is reserved between the adjusting seal cover 3 and the disc-shaped head, and the second gas channel is communicated with the valve body outlet 12. The disc-shaped head is in contact with the top of the valve core 7, the disc-shaped head is provided with a plurality of through third gas channels, and the first gas channels are communicated with the second gas channels through the third gas channels. In order to make the gas flow smooth, an upward concave channel may be provided at the bottom of the adjusting cover 3 in the radial direction to enlarge the cross-sectional area of the second gas channel, and the central axis of the concave channel is parallel to the central axis of the valve body outlet 12.

A second spring 5b is arranged between the inlet sealing cover 8 and the disc-shaped head part, and the second spring 5b is sleeved outside the valve core 7. The disc-shaped head and the valve core 7 are in a pressing state respectively through the acting force of the first spring 5a and the second spring 5b, and the valve core 7 can drive the ejector rod 6 to vertically move up and down along the cavity of the valve body 1.

The method for keeping the outlet flow and the pressure of the hydrogen pressure reducing valve stable comprises the following steps:

1) when hydrogen is not introduced into the pressure reducing valve, the first spring 5a and the second spring 5b are both in a compressed state due to the action of gravity, and the control channel is closed by the control tip end of the valve core 7.

2) When the pressure reducing valve works, firstly, an external hydrogen pipeline is respectively connected with the connecting structure of the threaded rod 2 and the inlet sealing cover 8, and simultaneously, hydrogen with the same pressure is introduced into the regulating channel 11 and the inlet channel 9. At this time, the control tip of the valve element 7 is pushed upward by the high-pressure hydrogen introduced from the inlet passage 9, thereby opening the control passage to communicate the inlet passage 9 with the intermediate passage 10. The hydrogen gas introduced from the inlet channel 9 passes through the control channel, the middle channel 10, the first gas channel, the third gas channel and the second gas channel in sequence, and is finally discharged from the valve body outlet 12. Wherein the hydrogen gas introduced from the regulating passage 11 is not communicated with the hydrogen gas introduced from the inlet passage 9, and the hydrogen gas introduced from the regulating passage 11 has only a downward force on the knock-out pin 6.

3) The cross-sectional area of the gap between the control tip of the spool 7 and the control passage is defined as the valve opening, and when the inlet hydrogen pressure is the same, the flow rate and pressure at the outlet are larger as the valve opening is larger, and the flow rate and pressure at the outlet are smaller as the valve opening is smaller.

Thus, during operation, as the pressure of the hydrogen gas passing into the pressure relief valve becomes lower, there is a tendency for the flow rate and pressure of the hydrogen gas at the valve body outlet 12 to become lower. Meanwhile, the acting force of the hydrogen introduced into the adjusting channel 11 on the ejector rod 6 is reduced, the opening degree of the valve is increased, and the flow rate and the pressure of the hydrogen at the outlet 12 of the valve body tend to be increased. The two trends cancel each other out so that the hydrogen flow and pressure at the valve body outlet 12 remain relatively steady.

During operation, as the pressure of the hydrogen gas introduced into the pressure relief valve increases, the flow and pressure of the hydrogen gas at the valve body outlet 12 tends to increase. Meanwhile, the acting force of the hydrogen introduced into the adjusting channel 11 on the ejector rod 6 is increased, the opening degree of the valve is reduced, and the hydrogen flow and the pressure at the valve body outlet 12 tend to be reduced. The two trends cancel each other out so that the hydrogen flow and pressure at the valve body outlet 12 remain relatively steady.

The pressure reducing valve has the advantages of simple structure, high reliability and long service life. When the pressure at the gas inlet of the pressure reducing valve is reduced as the hydrogen storage amount is reduced, the flow rate and the pressure at the outlet can be kept stable. When the pressure at the gas inlet of the pressure reducing valve becomes higher due to external reasons, the flow and the pressure at the outlet can be kept stable.

The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.