High-pressure hydrogen pressure reducing valve with combination of multi-layer labyrinth sleeve and opposite flushing type valve element structure

Abstract

The invention discloses a high-pressure hydrogen pressure reducing valve combined by a multi-layer labyrinth sleeve and an opposite flushing type valve core structure. The high-pressure hydrogen pressure reducing valve comprises a valve body, a valve cover, a valve core rod, a valve seat and the labyrinth sleeve, an air inlet and an air outlet are formed in the surface of the valve body, and an air channel is formed in the valve body and communicates with the air inlet and the air outlet; valve covers are buckled at the two ends of the valve body; the valve core rod comprises a first valve core rod and a second valve core rod; the first valve element rod and the second valve element rod are arranged at the two ends in the valve body respectively. The surface of the second valve core rod is provided with a hedging type runner groove; the valve seat comprises a first valve seat and a second valve seat; the first valve seat and the second valve seat are both arranged in the valve body, the first valve seat is arranged outside the first valve element rod in a sleeving mode, and the second valve seat is arranged outside the second valve element rod in a sleeving mode. A plurality of labyrinth sleeves are arranged and are overlapped and sleeved with one another; a continuous labyrinth channel is formed in the surface of the labyrinth sleeve; the multiple labyrinth sleeves are arranged outside the first valve element rod in a sleeving mode after being stacked. The pressure reducing valve is good in pressure reducing effect, and the outlet pressure can be stabilized.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen pressure reducing valves, and more particularly to a high-pressure hydrogen pressure reducing valve composed of a multi-layer labyrinth sleeve and an opposing valve core structure. Background Art

[0002] Hydrogen energy is regarded as the clean energy with the greatest development potential. Compared with traditional non-renewable energy sources such as oil, natural gas, and coal, hydrogen energy is a renewable green clean energy. With the rapid development of the hydrogen energy industry, hydrogen energy has gradually been scaled up in terms of production, storage, transportation, and utilization. Among them, because hydrogen is light in weight and has a small number of molecules, more hydrogen can be stored under high pressure, so the storage and utilization of high-pressure hydrogen is the best way to use it at present. The hydrogen in the gas cylinder is under high pressure, but the use of hydrogen is under low pressure, so in the process of using hydrogen, the pressure and flow of high-pressure hydrogen need to be accurately controlled within a certain range.

[0003] The high-pressure hydrogen pressure reducing valve adjusts the flow of hydrogen by controlling the opening of the valve core in the valve body, thereby reducing the pressure of the high-pressure hydrogen. At the same time, the valve core opening is adjusted with the help of the pressure behind the valve to keep the pressure behind the valve within a certain range. When the inlet pressure keeps changing, the outlet pressure is kept within the set range.

[0004] However, the current high-pressure hydrogen pressure reducing valve has a simple pressure reducing structure. Even if there is a multi-stage pressure reducing structure, it is a simple needle-type or piston structure, which cannot achieve large-span pressure reduction, and the outlet pressure is unstable and fluctuates greatly.

[0005] Therefore, it is an urgent problem for technical personnel in this field to develop a high-pressure hydrogen pressure reducing valve that combines a multi-layer labyrinth sleeve and an offset valve core structure with stable outlet pressure and small fluctuation. Summary of the invention

[0006] In view of this, the present invention provides a high-pressure hydrogen pressure reducing valve which is a combination of a multi-layer labyrinth sleeve and an offset valve core structure and has a stable outlet pressure with small fluctuation.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] The high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure comprises:

[0009] A valve body, wherein an air inlet and an air outlet are provided on the surface of the valve body, and an air passage is provided in the valve body, and the air passage is communicated with the air inlet and the air outlet;

[0010] Valve covers, both ends of the valve body are buckled with the valve covers;

[0011] The valve core rod comprises: a first valve core rod and a second valve core rod; the first valve core rod and the second valve core rod are respectively arranged at two ends of the valve body; and a counter-flow channel groove is formed on the surface of the second valve core rod;

[0012] A valve seat, the valve seat comprising: a first valve seat and a second valve seat; the first valve seat and the second valve seat are both arranged in the valve body, and the first valve seat is sleeved on the outside of the first valve core rod, and the second valve seat is sleeved on the outside of the second valve core rod;

[0013] A labyrinth sleeve, wherein a plurality of labyrinth sleeves are provided and are stacked and sleeved on each other; a continuous labyrinth channel is opened on the surface of the labyrinth sleeve; and a plurality of the labyrinth sleeves are stacked and sleeved on the outside of the first valve core rod.

[0014] The beneficial effect of adopting the above technical solution is that the gas can be decompressed in two stages by the labyrinth sleeve and the counter-flow channel grooves in the present invention, which can make the decompression effect more effective.

[0015] Preferably, a gland is further sleeved on the outside of the first valve core rod, and the first valve seat, the labyrinth sleeve and the gland are sequentially arranged on the outside of the first valve core rod along the flow direction of the gas.

[0016] Preferably, the size of the labyrinth channel gradually increases along the flow direction of the gas. The size setting of the labyrinth channel can play a role in reducing the pressure of the gas.

[0017] Preferably, an annular confluence groove is formed at one end of the labyrinth sleeve close to the first valve seat, and the plurality of labyrinth channels are all connected to the confluence groove, which facilitates the convergence of gas after decompression.

[0018] Preferably, a plurality of annular guide grooves are provided on the end surfaces of the first valve seat and the gland that contact the labyrinth sleeve.

[0019] Preferably, a plurality of air guide holes are provided inside the gland, and the air guide holes are connected to the labyrinth passage, so that the gas can enter the cavity of the valve cover easily.

[0020] Preferably, the counter-flow channel groove is in a bent shape. After the gas enters the counter-flow channel groove, gas counter-flow will be performed, resulting in energy loss, thereby reducing the pressure of the gas.

[0021] Preferably, the first valve core rod and the second valve core rod are both provided with a stopper on their exteriors, a step is provided on the side wall of the inner cavity of the valve body near the stopper, and a first spring is sleeved on the exteriors of the first valve core rod and the second valve core rod, one end of the first spring is connected to the stopper, and the other end is connected to the step. When the gas pressure at the inlet gradually decreases, the reaction force of the first spring will push the piston, so that the gap between the first valve core rod and the first valve seat or the second valve core rod and the second valve seat is expanded, thereby stabilizing the outlet pressure.

[0022] Preferably, a piston is provided inside the valve cover, one end of the piston abuts against the pressure cover or the second valve seat, and the other end is connected to a second spring, and the other end of the second spring is connected to the inner wall of the valve cover.

[0023] Preferably, an adjusting screw is provided on the outside of the valve cover, one end of the adjusting screw is located outside the valve cover, and the other end extends into the inside of the valve cover and is connected to the second spring to adjust the compression degree of the second spring. When high-pressure gas enters the inlet, the compression degree of the second spring can be adjusted by adjusting the screw, thereby adjusting the gap between the first valve core rod and the first valve seat or the second valve core rod and the second valve seat after the gas enters the inner cavity of the valve cover.

[0024] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a high-pressure hydrogen pressure reducing valve in which a multi-layer labyrinth sleeve and an offset valve core structure are combined, and the beneficial effects are as follows:

[0025] (1) In the present invention, the gas can be decompressed in two stages by means of the labyrinth sleeve and the counter-flow channel grooves, which can make the decompression effect more effective;

[0026] (2) Through the action of the first spring and the second spring, the outlet pressure can be stabilized when the inlet pressure is constantly changing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 An internal cross-sectional view of the pressure reducing valve provided by the present invention;

[0029] Figure 2 A schematic diagram of the structure of a multi-layer labyrinth sleeve in a pressure reducing valve provided by the present invention;

[0030] Figure 3A schematic diagram of the structure of a labyrinth sleeve in a pressure reducing valve provided by the present invention;

[0031] Figure 4 A schematic diagram of the structure of the pressure relief cover in the pressure relief valve provided by the present invention;

[0032] Figure 5 A bottom view of the gland in the pressure reducing valve provided by the present invention;

[0033] Figure 6 A schematic diagram of the structure of a first valve seat in the pressure reducing valve provided by the present invention;

[0034] Figure 7 A top view of a first valve seat in the pressure reducing valve provided by the present invention;

[0035] Figure 8 This is a schematic structural diagram of the second valve core rod in the pressure reducing valve provided by the present invention.

[0036] Among them, in the figure,

[0037] 1- Valve body;

[0038] 11-air inlet; 12-air outlet; 13-airway;

[0039] 2-valve cover; 3-first valve core rod;

[0040] 4- second valve core rod;

[0041] 41- counter-flow channel groove;

[0042] 5-first valve seat; 6-second valve seat;

[0043] 7- Labyrinth sleeve;

[0044] 71-maze passage; 72-confluence trough;

[0045] 8- gland;

[0046] 81- air guide hole;

[0047] 9- diversion groove; 10- stopper; 011- step;

[0048] 012-first spring;

[0049] 0121-upper first spring; 0122-lower first spring;

[0050] 013-Piston;

[0051] 0131-upper piston; 0132-lower piston;

[0052] 014-Second spring;

[0053] 0141-upper second spring; 0142-lower second spring;

[0054] 015-Adjusting screw. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The embodiment of the present invention discloses a high-pressure hydrogen pressure reducing valve composed of a multi-layer labyrinth sleeve and an opposing valve core structure, comprising:

[0057] A valve body 1, the surface of the valve body 1 is provided with an air inlet 11 and an air outlet 12, and an air passage 13 is provided inside the valve body 1, the air passage 13 is connected with the air inlet 11 and the air outlet 12;

[0058] Valve cover 2, both ends of the valve body 1 are buckled with valve covers 2;

[0059] The valve core rod comprises: a first valve core rod 3 and a second valve core rod 4; the first valve core rod 3 and the second valve core rod 4 are respectively arranged at two ends inside the valve body 1; a counter-flow channel groove 41 is opened on the surface of the second valve core rod 4;

[0060] The valve seat comprises: a first valve seat 5 and a second valve seat 6; the first valve seat 5 and the second valve seat 6 are both arranged in the valve body 1, and the first valve seat 5 is sleeved on the outside of the first valve core rod 3, and the second valve seat 6 is sleeved on the outside of the second valve core rod 4;

[0061] The labyrinth sleeve 7 is provided with a plurality of labyrinth sleeves 7, and the labyrinth sleeves 7 are stacked and sleeved on each other; a continuous labyrinth channel 71 is opened on the surface of the labyrinth sleeve 7; and the plurality of labyrinth sleeves 7 are stacked and sleeved on the outside of the first valve core rod 3. When the gas enters the valve body 1, it first passes through the labyrinth sleeve 7 for primary decompression, and then enters the counter-flow channel groove 41 of the second valve core stem 4 for secondary decompression, which can improve the decompression effect on the gas.

[0062] In order to further optimize the above technical solution, a pressure cover 8 is also sleeved on the outside of the first valve core rod 3, and the first valve seat 5, the labyrinth sleeve 7 and the pressure cover 8 are arranged in sequence outside the first valve core rod 3 along the flow direction of the gas.

[0063] In order to further optimize the above technical solution, the size of the labyrinth channel 71 gradually increases along the flow direction of the gas.

[0064] In order to further optimize the above technical solution, an annular confluence groove 72 is provided at one end of the labyrinth sleeve 7 close to the gland 8 , and the plurality of labyrinth channels 71 are all connected to the confluence groove 72 .

[0065] In order to further optimize the above technical solution, a plurality of annular guide grooves 9 are provided at the end surfaces where the first valve seat 5, the gland 8 and the labyrinth sleeve 7 contact. The guide grooves on the first valve seat 5 are connected with the labyrinth channel 71 of the labyrinth sleeve 7, and the guide grooves on the gland 8 are connected with the confluence grooves 72 of the labyrinth sleeve 7, so that the gas can be circulated and decompressed.

[0066] In order to further optimize the above technical solution, a plurality of air guide holes 81 are opened inside the gland 8 , and the air guide holes 81 are connected to the labyrinth passage 71 .

[0067] In order to further optimize the above technical solution, the counter-flow channel groove 41 is bent. The counter-flow channel groove 41 has both a straight channel and a bent channel. After the gas enters the bent channel, it will return to the original path. The returned gas collides with the gas in the straight channel, which will cause energy loss and reduce the gas pressure.

[0068] In order to further optimize the above technical solution, the first valve core rod 3 and the second valve core rod 4 are both provided with a stopper 10 on their exteriors, a step 011 is provided on the side wall of the inner cavity of the valve body 1 near the stopper 10, and a first spring 012 is sleeved on the exteriors of the first valve core rod 3 and the second valve core rod 4, one end of the first spring 012 is connected to the stopper 10, and the other end is connected to the step 011. The first spring 012 includes: an upper first spring 0121 and a lower first spring 0122, the upper first spring 0121 is connected to the first valve stem 3, and the lower first spring 0122 is connected to the second valve stem 4.

[0069] In order to further optimize the above technical solution, a piston 013 is provided inside the valve cover 2, one end of the piston 013 is in contact with the gland 8 or the second valve seat 6, and the other end is connected to the second spring 014, and the other end of the second spring 014 is connected to the inner wall of the valve cover 2. The piston 013 includes: an upper piston 0131 and a lower piston 0132, the upper piston 0131 is located at the upper end of the valve body 1, and the lower piston 0132 is located at the lower end of the valve body 1. The second spring 014 includes: an upper second spring 0141 and a lower second spring 0142, the upper second spring 0141 is connected to the upper piston 0131, and the lower second spring 0142 is connected to the lower piston 0132.

[0070] In order to further optimize the above technical solution, an adjusting screw 015 is provided on the outside of the valve cover 2, one end of the adjusting screw 015 is located outside the valve cover 2, and the other end extends into the inside of the valve cover 2 and is connected to the second spring 014 to adjust the compression degree of the second spring 014.

[0071] Working principle:

[0072] The valve body is provided with a two-stage decompression structure of a labyrinth sleeve 7 and an opposing flow channel groove 41 on the second valve core rod 4. The high-pressure gas enters the first-stage decompression chamber from the air inlet 11, passes through the gap between the first valve core rod 3 and the valve body 1, enters the guide groove 9 of the first valve seat 5, and then enters the labyrinth channel 71 of the multi-layer nested labyrinth sleeve 7 to perform large-span decompression; the decompressed gas is gathered through the annular guide groove 9 at the bottom of the pressure cover 8, and then enters the piston chamber at the first valve seat 5 through the air guide hole 81, and pushes the upper piston 0131 to move. The other side of the upper piston 0131 is acted upon by an upper second spring 0141. The upper second spring 0141 and the high-pressure gas act on the upper piston 0131 in combination. The upper piston 0131 moves up and down according to the comparison result, and at the same time pushes the first valve The core rod 3 moves, and the rear end of the first valve core rod 3 is acted upon by the upper first spring 0121. The result of the joint action of the upper piston 0131 and the upper first spring 0121 is to adjust the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 to adjust the air intake amount entering the labyrinth sleeve 7. When the inlet pressure is high, the upper piston 0131 moves upward, and at the same time, under the action of the upper first spring 0121, the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 will decrease; when the inlet pressure decreases, the upper piston 0131 moves downward, and at the same time, under the action of the upper first spring 0121, the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 will increase, thereby adjusting the air intake amount entering the labyrinth sleeve 7, first performing a wave of pressure stabilization, and then performing pressure reduction after entering the labyrinth sleeve 7.

[0073] The gas after the above series of pressure reduction and stabilization passes through the valve body air channel 13, and then passes through the gap between the second valve core rod 4 and the valve body 1, and then enters the counter-pressure channel groove 41 on the surface of the second valve core rod 4. The gas after counter-pressure reduction enters the piston cavity of the lower piston 0132. The other side of the lower piston 0132 is acted upon by the lower second spring 0142. The lower second spring 0142 and the high-pressure gas act on the lower piston 0132 in combination. The lower piston 0132 moves up and down according to the comparison result, and at the same time pushes the second valve core rod 4 to move. The rear end of the second valve core rod 4 is acted upon by the lower first spring 0122. The lower piston 0132 and the lower first spring 0122 act together. The result of the same action is to adjust the gap between the sealing surface of the second valve core rod 4 and the sealing surface of the second valve seat 6 to adjust the intake volume entering the counter flow channel 41. When the inlet pressure is high, the lower piston 0132 moves upward, and the gap between the sealing surface of the second valve core rod 4 and the sealing surface of the second valve seat 6 will decrease under the action of the lower first spring 0122. When the inlet pressure decreases, the lower piston 0132 moves downward, and the gap between the sealing surface of the second valve core rod 4 and the sealing surface of the second valve seat 6 will increase under the action of the lower first spring 0122, so as to adjust the intake volume entering the counter flow channel 41, first perform a wave of pressure stabilization, and then perform pressure reduction after entering the counter flow channel 41. Finally, it flows out through the air channel 13 of the valve body 1 through the outlet.

[0074] The screw rod 015 adjusts the preload of the second spring 014, and further adjusts the setting of the outlet pressure. The preload of the second spring 014 is adjusted according to the requirements of different outlet pressures to meet the setting requirements.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure, characterized in that: include: A valve body (1), wherein an air inlet (11) and an air outlet (12) are provided on the surface of the valve body (1), and an air passage (13) is provided inside the valve body (1), and the air passage (13) is connected to the air inlet (11) and the air outlet (12); A valve cover (2), the valve cover (2) being buckled on both ends of the valve body (1); A valve core rod, the valve core rod comprising: a first valve core rod (3) and a second valve core rod (4); the first valve core rod (3) and the second valve core rod (4) are respectively arranged at two ends inside the valve body (1); and a counter-flow channel groove (41) is provided on the surface of the second valve core rod (4); A valve seat, the valve seat comprising: A first valve seat (5) and a second valve seat (6); the first valve seat (5) and the second valve seat (6) are both arranged in the valve body (1), and the first valve seat (5) is sleeved on the outside of the first valve core rod (3), and the second valve seat (6) is sleeved on the outside of the second valve core rod (4); A labyrinth sleeve (7), wherein a plurality of the labyrinth sleeves (7) are provided and are stacked and sleeved on each other; a continuous labyrinth channel (71) is opened on the surface of the labyrinth sleeve (7); and a plurality of the labyrinth sleeves (7) are stacked and sleeved on the outside of the first valve core rod (3).

2. The high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure according to claim 1 is characterized in that: The first valve core rod (3) is also sleeved with a gland (8), and the first valve seat (5), the labyrinth sleeve (7) and the gland (8) are arranged in sequence outside the first valve core rod (3) along the flow direction of the gas.

3. The high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure according to claim 1 is characterized in that: The size of the labyrinth channel (71) gradually increases along the flow direction of the gas.

4. The high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure according to claim 2 is characterized in that: An annular confluence groove (72) is provided at one end of the labyrinth sleeve (7) close to the gland (8), and the plurality of labyrinth channels (71) are all connected to the confluence groove (72).

5. The high-pressure hydrogen pressure reducing valve of the combination of the multi-layer labyrinth sleeve and the countervailing valve core structure according to claim 4 is characterized in that: A plurality of annular flow guide grooves (9) are provided at the end surfaces of the first valve seat (5) and the gland (8) that contact the labyrinth sleeve (7).

6. The high-pressure hydrogen pressure reducing valve with a combination of a multi-layer labyrinth sleeve and an opposing valve core structure according to claim 5, characterized in that: A plurality of air guide holes (81) are provided inside the gland (8), and the air guide holes (81) are connected to the labyrinth passage (71).

7. The high-pressure hydrogen pressure reducing valve with a combination of a multi-layer labyrinth sleeve and an opposing valve core structure according to claim 1, characterized in that: The counter-flow channel groove (41) is in a bent shape.

8. The high-pressure hydrogen pressure reducing valve with a combination of a multi-layer labyrinth sleeve and an opposing valve core structure according to claim 1, characterized in that: A stopper (10) is disposed on the outside of the first valve core rod (3) and the second valve core rod (4); a step (011) is disposed on the side wall of the inner cavity of the valve body (1) close to the stopper (10); a first spring (012) is sleeved on the outside of the first valve core rod (3) and the second valve core rod (4); one end of the first spring (012) is connected to the stopper (10), and the other end is connected to the step (011).

9. The high-pressure hydrogen pressure reducing valve with a multi-layer labyrinth sleeve and a countervailing valve core structure according to claim 2, characterized in that: A piston (013) is provided inside the valve cover (2), one end of the piston (013) is in contact with the pressure cover (8) or the second valve seat (6), and the other end is connected to a second spring (014), and the other end of the second spring (014) is connected to the inner wall of the valve cover (2).

10. The high-pressure hydrogen pressure reducing valve with a combination of a multi-layer labyrinth sleeve and an opposing valve core structure according to claim 9, characterized in that: An adjusting screw (015) is arranged outside the valve cover (2), one end of the adjusting screw (015) is located outside the valve cover (2), and the other end extends into the interior of the valve cover (2) and is connected to the second spring (014) to adjust the compression degree of the second spring (014).

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