High pressure hydrogen pressure reducing valve with multi-layer labyrinth sleeve and counteracting spool structure

Abstract

The application discloses a high-pressure hydrogen pressure reducing valve combined with a multi-layer labyrinth sleeve and a butt-shock valve core structure, which comprises a valve body, a valve cover, a valve core rod, a valve seat and a labyrinth sleeve; the surface of the valve body is provided with an air inlet and an air outlet, and an air channel is arranged in the valve body and communicates with the air inlet and the air outlet; the valve cover is buckled at both ends of the valve body; 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 arranged at both ends in the valve body; the surface of the second valve core rod is provided with a butt-shock flow channel groove; the valve seat comprises a first valve seat and a second valve seat; the first valve seat and the second valve seat are arranged in the valve body, the first valve seat is sleeved outside the first valve core rod, and the second valve seat is sleeved outside the second valve core rod; a plurality of labyrinth sleeves are arranged and are mutually overlapped and sleeved; the surface of the labyrinth sleeve is provided with a continuous labyrinth passage; and the plurality of labyrinth sleeves are overlapped and sleeved outside the first valve core rod. The pressure reducing valve has good pressure reducing effect and can stabilize the outlet pressure.

Description

Technical Field

[0001] This invention relates to the field of hydrogen pressure reducing valve technology, and more specifically to a high-pressure hydrogen pressure reducing valve that combines a multi-layer labyrinth sleeve with a counter-flow valve core structure. Background Technology

[0002] Hydrogen energy is considered the most promising clean energy source. Compared to traditional non-renewable energy sources such as oil, natural gas, and coal, hydrogen energy is a renewable, green, and clean energy source. With the rapid development of the hydrogen energy industry, hydrogen energy production, storage, transportation, and utilization are gradually becoming large-scale. Because hydrogen is lightweight and has a small molecular number, more hydrogen can be stored under high pressure, making high-pressure hydrogen storage and utilization the optimal method currently. While the hydrogen in the storage cylinder is under high pressure, its utilization occurs under low pressure. Therefore, during hydrogen use, the pressure and flow rate of the high-pressure hydrogen must be precisely controlled within a certain range.

[0003] The high-pressure hydrogen pressure reducing valve regulates the flow rate of hydrogen by controlling the opening of the valve core within the valve body, thereby reducing the pressure of the high-pressure hydrogen. At the same time, it uses the downstream pressure to regulate the opening of the valve core, keeping the downstream pressure within a certain range. Even when the inlet pressure changes continuously, it keeps the outlet pressure within the set range.

[0004] However, currently, high-pressure hydrogen pressure reducing valves have simple pressure reducing structures. Even those with multi-stage pressure reducing structures are simple needle or piston structures, which cannot achieve large-span pressure reduction, and the outlet pressure is unstable and fluctuates greatly.

[0005] Therefore, developing a high-pressure hydrogen pressure reducing valve that combines a multi-layer labyrinth sleeve with a counter-pressure valve core structure to ensure stable outlet pressure and minimize fluctuations is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a high-pressure hydrogen pressure reducing valve that combines a multi-layer labyrinth sleeve with a counter-flush valve core structure, providing stable outlet pressure with minimal fluctuations.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-pressure hydrogen pressure reducing valve combining a multi-layer labyrinth sleeve and a counter-flush valve core structure includes:

[0009] The valve body has an air inlet and an air outlet on its surface, and an air passage is provided inside the valve body, which is connected to the air inlet and the air outlet.

[0010] A valve cover is attached to both ends of the valve body;

[0011] The valve core rod includes: a first valve core rod and a second valve core rod; the first valve core rod and the second valve core rod are respectively disposed at both ends inside the valve body; the surface of the second valve core rod is provided with a counter-flow channel groove.

[0012] The valve seat includes a first valve seat and a second valve seat; both the first valve seat and the second valve seat are disposed 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 is provided, and multiple labyrinth sleeves are provided and stacked on top of each other; the surface of the labyrinth sleeve is provided with continuous labyrinth channels; the multiple labyrinth sleeves are stacked and placed 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 depressurized in two stages by means of the labyrinth sleeve and the counter-flow channel groove, which can make the depressurization effect more effective.

[0015] Preferably, a pressure cap is also fitted over the outside of the first valve core rod, and the first valve seat, labyrinth sleeve and pressure cap are arranged sequentially on the outside of the first valve core rod along the gas flow direction.

[0016] Preferably, the dimensions of the labyrinth channel gradually increase along the gas flow direction. This dimensional arrangement of the labyrinth channel can help reduce gas pressure.

[0017] Preferably, the labyrinth sleeve has an annular manifold groove at one end near the first valve seat, and the plurality of labyrinth channels are connected to the manifold groove. The manifold groove facilitates the collection of gas after depressurization.

[0018] Preferably, multiple annular guide grooves are provided at the end faces of the first valve seat, the gland, and the labyrinth sleeve that are in contact with each other.

[0019] Preferably, the gland has multiple air vents inside, which are connected to the labyrinth channel. These air vents facilitate the entry of gas into the valve cover cavity.

[0020] Preferably, the counter-flow channel is bent. After the gas enters the counter-flow channel, it undergoes gas counter-flow, resulting in energy loss and thus reducing the gas pressure.

[0021] Preferably, both the first and second valve core rods are provided with stops on their outer surfaces. A step is provided on the side wall of the valve body cavity near the stop. A first spring is sleeved on the outer surface of both the first and second valve core rods, with one end connected to the stop and the other end connected to the step. When the inlet gas pressure gradually decreases, the reaction force of the first spring pushes the piston, widening the gap between the first valve core rod and the first valve seat, or between the second valve core rod and the second valve seat, thereby stabilizing the outlet pressure.

[0022] Preferably, the valve cover is provided with a piston inside, one end of the piston abuts against the gland or the second valve seat, and the other end is connected to a second spring, the other end of the second spring being 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, adjusting 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 adjusting 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] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a high-pressure hydrogen pressure reducing valve that combines a multi-layer labyrinth sleeve and a counter-flow valve core structure, the advantages of which are:

[0025] (1) In this invention, the gas can be depressurized in two stages by using the labyrinth sleeve and the counter-flow channel groove, which can make the depressurization effect more effective.

[0026] (2) Simultaneously, through the action of the first spring and the second spring, the outlet pressure can be stabilized under the condition that the inlet pressure is constantly changing. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

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

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

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

[0031] Figure 4 This is a schematic diagram of the pressure cap structure in the pressure reducing valve provided by the present invention;

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

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

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

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

[0036] In the figure,

[0037] 1-Valve body;

[0038] 11-Air inlet; 12-Air outlet; 13-Air passage;

[0039] 2-Valve cover; 3-First valve stem;

[0040] 4-Second valve core rod;

[0041] 41- Opposed flow channel groove;

[0042] 5-First valve seat; 6-Second valve seat;

[0043] 7-Maze sleeve;

[0044] 71-Maze passage; 72-Convergence channel;

[0045] 8-Capping;

[0046] 81-Air guide hole;

[0047] 9-Guide channel; 10-Block; 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 Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] This invention discloses a high-pressure hydrogen pressure reducing valve combining a multi-layer labyrinth sleeve and a counter-flush valve core structure, comprising:

[0057] The valve body 1 has an air inlet 11 and an air outlet 12 on its surface, and an air passage 13 is provided inside the valve body 1, which is connected to the air inlet 11 and the air outlet 12.

[0058] Valve cover 2 is fastened to both ends of valve body 1;

[0059] The valve core rod includes: 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 disposed at both ends inside the valve body 1; the surface of the second valve core rod 4 is provided with a counter-flow channel groove 41;

[0060] The valve seat includes a first valve seat 5 and a second valve seat 6. Both the first valve seat 5 and the second valve seat 6 are disposed inside 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] Multiple labyrinth sleeves 7 are provided and stacked on top of each other; the surface of each labyrinth sleeve 7 has continuous labyrinth channels 71; the multiple labyrinth sleeves 7 are stacked and fitted over the outside of the first valve core rod 3. When gas enters the valve body 1, it first undergoes primary pressure reduction through the labyrinth sleeves 7, and then enters the counter-flow channel groove 41 of the second valve core rod 4 for secondary pressure reduction, which can improve the pressure reduction effect on the gas.

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

[0063] To further optimize the above technical solution, the size of the maze channel 71 gradually increases along the direction of gas flow.

[0064] To further optimize the above technical solution, an annular confluence groove 72 is provided at one end of the maze sleeve 7 near the pressure cap 8, and multiple maze channels 71 are connected to the confluence groove 72.

[0065] To further optimize the above technical solution, multiple annular guide grooves 9 are provided at the end faces of the first valve seat 5, the pressure cap 8, and the labyrinth sleeve 7 where they contact each other. The guide grooves on the first valve seat 5 are connected to the labyrinth channel 71 of the labyrinth sleeve 7, and the guide grooves on the pressure cap 8 are connected to the confluence groove 72 of the labyrinth sleeve 7, which can realize the flow and pressure reduction of gas.

[0066] To further optimize the above technical solution, the inside of the pressure cap 8 is provided with multiple air guide holes 81, which are connected to the labyrinth channel 71.

[0067] To further optimize the above technical solution, the counter-flow channel 41 is bent. The counter-flow channel 41 contains both straight channels and bent channels. After the gas enters the bent channel, it will return along the same path. The returning gas will collide with the gas in the straight channel, resulting in energy loss and thus reducing the gas pressure.

[0068] To further optimize the above technical solution, both the first valve core rod 3 and the second valve core rod 4 are provided with a stop block 10 on their exterior. A step 011 is provided on the side wall of the valve body 1 near the stop block 10. A first spring 012 is sleeved on the exterior 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 stop block 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 core rod 3, and the lower first spring 0122 is connected to the second valve core rod 4.

[0069] To further optimize the above technical solution, a piston 013 is provided inside the valve cover 2. One end of the piston 013 abuts against the pressure cap 8 or the second valve seat 6, and the other end is connected to a second spring 014. 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] 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 equipped with a two-stage pressure reduction structure consisting of a labyrinth sleeve 7 and a counter-current flow channel groove 41 on the second valve core rod 4. High-pressure gas enters the first-stage pressure reduction chamber from the inlet 11, passes through the gap between the first valve core rod 3 and the valve body 1, and enters the guide groove 9 of the first valve seat 5. Then, it enters the labyrinth channel 71 of the multi-layer nested labyrinth sleeve 7 for large-span pressure reduction. After pressure reduction, the gas is collected by 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, pushing the upper piston 0131 to move. The upper piston 0131 has an upper second spring 0141 on the other side. The upper second spring 0141 and the high-pressure gas work together on the upper piston 0131, causing the upper piston 0131 to move up and down according to the comparison result, while pushing the first valve core rod 4. When the core rod 3 moves, the upper first spring 0121 acts at the rear end of the first valve core rod 3. The combined action of the upper piston 0131 and the upper first spring 0121 adjusts the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 to regulate the air intake into the labyrinth sleeve 7. When the inlet pressure is high, the upper piston 0131 moves upward, and the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 decreases under the action of the upper first spring 0121. When the inlet pressure decreases, the upper piston 0131 moves downward, and the gap between the sealing surface of the first valve core rod 3 and the sealing surface of the first valve seat 5 increases under the action of the upper first spring 0121, thus adjusting the air intake into the labyrinth sleeve 7. This firstly stabilizes the pressure, and then depressurizes the pressure after entering the labyrinth sleeve 7.

[0073] After undergoing the aforementioned series of pressure reduction and stabilization processes, the gas passes through the valve body gas passage 13, then through the gap between the second valve core rod 4 and the valve body 1, and finally enters the counter-flow channel groove 41 on the surface of the second valve core rod 4. After pressure reduction, the gas enters the piston chamber of the lower piston 0132. The other side of the lower piston 0132 is acted upon by a lower second spring 0142. The lower second spring 0142 and the high-pressure gas work together to act on the lower piston 0132, causing it to move up and down according to the comparison result. Simultaneously, this pushes the second valve core rod 4 to move. The rear end of the second valve core rod 4 is acted upon by a lower first spring 0122. The lower piston 0132 and the lower first spring 0122 work together... The result of this 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 regulate the air intake into the counter-current channel 41. When the inlet pressure is high, the lower piston 0132 moves upward, and at the same time, the gap between the sealing surface of the second valve core rod 4 and the sealing surface of the second valve seat 6 decreases under the action of the lower first spring 0122. When the inlet pressure decreases, the lower piston 0132 moves downward, and at the same time, the gap between the sealing surface of the second valve core rod 4 and the sealing surface of the second valve seat 6 increases under the action of the lower first spring 0122, thus adjusting the air intake into the counter-current channel 41. This first stage of pressure stabilization is then performed, followed by pressure reduction after entering the counter-current channel 41. Finally, the air flows out through the outlet via the air passage 13 of the valve body 1.

[0074] The screw 015 adjusts the preload of the second spring 014, thereby adjusting the outlet pressure setting. The preload of the second spring 014 is adjusted according to the different outlet pressure requirements to achieve the set requirements.

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

[0076] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure hydrogen pressure reducing valve combining a multi-layer labyrinth sleeve and a counter-flush valve core structure, characterized in that, include: The valve body (1) has an air inlet (11) and an air outlet (12) on its surface, and an air passage (13) is provided inside the valve body (1), which is connected to the air inlet (11) and the air outlet (12). Valve cover (2), both ends of the valve body (1) are fastened with the valve cover (2); The valve core rod includes 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 disposed at both ends inside the valve body (1); the surface of the second valve core rod (4) is provided with a counter-flow channel groove (41). Valve seat, the valve seat comprising: First valve seat (5) and second valve seat (6); both the first valve seat (5) and the second valve seat (6) are disposed inside 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) is provided in multiple ways and is stacked on top of each other; a continuous labyrinth channel (71) is opened on the surface of the labyrinth sleeve (7); multiple labyrinth sleeves (7) are stacked and placed on the outside of the first valve core rod (3); the size of the labyrinth channel (71) gradually increases along the gas flow direction; The first valve core rod (3) is also fitted with a pressure cap (8), and the first valve seat (5), labyrinth sleeve (7) and pressure cap (8) are arranged in sequence on the outside of the first valve core rod (3) along the gas flow direction; The labyrinth sleeve (7) has an annular confluence groove (72) at one end near the pressure cap (8), and the multiple labyrinth channels (71) are connected to the confluence groove (72); Multiple annular guide grooves (9) are provided at the end faces of the first valve seat (5), the pressure cap (8) and the labyrinth sleeve (7) that are in contact with each other. The pressure cap (8) has multiple air vents (81) inside, and the air vents (81) are connected to the labyrinth channel (71).

2. The high-pressure hydrogen pressure reducing valve based on the combination of a multi-layer labyrinth sleeve and a counter-flush valve core structure as described in claim 1, characterized in that, The counter-flow channel (41) is bent.

3. The high-pressure hydrogen pressure reducing valve based on the combination of a multi-layer labyrinth sleeve and a counter-flush valve core structure as described in claim 1, characterized in that, Both the first valve core rod (3) and the second valve core rod (4) are provided with a stop (10). The valve body (1) has a step (011) on the side wall near the stop (10) in the inner cavity. The first valve core rod (3) and the second valve core rod (4) are fitted with a first spring (012). One end of the first spring (012) is connected to the stop (10), and the other end is connected to the step (011).

4. The high-pressure hydrogen pressure reducing valve based on the combination of a multi-layer labyrinth sleeve and a counter-flush valve core structure as described in claim 1, characterized in that, The valve cover (2) is provided with a piston (013) inside. One end of the piston (013) abuts against the pressure cap (8) or the second valve seat (6), and the other end is connected to the second spring (014). The other end of the second spring (014) is connected to the inner wall of the valve cover (2).

5. The high-pressure hydrogen pressure reducing valve based on the combination of a multi-layer labyrinth sleeve and a counter-flush valve core structure as described in claim 4, characterized in that, 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).

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