Hydrogen delivery regulating valve

Abstract

This utility model belongs to the field of valve technology and discloses a hydrogen delivery regulating valve. The valve body has an internal medium flow channel. A valve cover is installed on the valve body and forms an installation cavity that connects to the medium flow channel. A valve seat is installed in the installation cavity. A valve core is sealed and inserted into the inner hole of the valve seat. A valve stem is sealed and inserted into the inner hole of the valve cover and connected to the valve core. The valve stem drives the valve core to slide axially to block or connect the medium flow channel. A packing seal ring is sandwiched between the valve cover and the valve stem. A packing gland is sealed and connected to the end of the valve cover away from the valve body. The valve stem is sealed and inserted into the packing gland. The packing gland compresses the packing seal ring, causing the packing seal ring to deform and seal the gap between the valve cover and the valve stem, ensuring a sealing effect between the valve cover and the valve stem and preventing hydrogen leakage. The valve body, valve cover, valve seat, valve core, valve stem, and packing gland are made of high-nickel alloy, austenitic stainless steel, or titanium alloy, which have good resistance to hydrogen embrittlement, avoiding hydrogen embrittlement and reducing safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a hydrogen delivery regulating valve. Background Technology

[0002] High-pressure hydrogen transportation is one of the key technologies in the hydrogen energy industry, involving hydrogen storage, transportation and safety management. When high-pressure hydrogen is transported through pipelines, regulating valves on the pipelines are used to control the on / off state and flow rate of the high-pressure hydrogen.

[0003] However, existing control valves have the following drawbacks: on the one hand, due to the small mass of hydrogen molecules, they are very easy to escape at the valve; on the other hand, during the transportation process, the valve is in a high-pressure hydrogen environment, and hydrogen atoms will penetrate into the interior of the valve material, accumulating at grain boundaries or defects to form molecular hydrogen, resulting in local stress concentration, thereby reducing the ductility and toughness of the valve material, which may eventually lead to sudden brittle fracture (hydrogen embrittlement), causing serious safety hazards. Utility Model Content

[0004] The purpose of this invention is to provide a hydrogen delivery regulating valve that can effectively prevent hydrogen from escaping during delivery and also avoid hydrogen embrittlement.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A hydrogen delivery regulating valve includes a valve body, a valve cover, a valve seat, a valve core, a valve stem, a packing seal ring, and a packing gland. The valve body has an internal medium flow channel. The valve cover is installed on the valve body and cooperates with the valve body to form an installation cavity communicating with the medium flow channel. The valve seat is installed in the installation cavity. The valve core is sealed and inserted into the inner hole of the valve seat. The valve stem is sealed and inserted into the inner hole of the valve cover, and one end of the valve stem is connected to the valve core. The valve seat, valve cover, valve core, and valve stem are coaxially arranged and perpendicular to the flow direction of the medium flow channel. The packing seal ring is sandwiched between the valve cover and the valve stem. The packing gland is sealed and inserted into and connected to the end of the valve cover away from the valve body. The valve stem is sealed and inserted into the packing gland. The packing gland is configured to compress the packing seal ring. The valve body, valve cover, valve seat, valve core, valve stem, and packing gland are made of high-nickel alloy, austenitic stainless steel, or titanium alloy.

[0007] Preferably, the packing seal is a spring-energy-storing seal, which includes an elastic ring and a plurality of compression springs embedded in the elastic ring, the compression springs being used to apply force to the elastic ring.

[0008] Preferably, the hydrogen delivery regulating valve further includes guide packing, which is sandwiched between the valve cover and the valve stem, with one end of the guide packing circumferentially abutting the packing gland and the other end circumferentially abutting the packing seal ring.

[0009] Preferably, a valve seat sealing ring is sandwiched between the outer wall of the valve seat and the inner wall of the valve body, and a valve cover sealing ring is sandwiched between the outer wall of the valve cover and the inner wall of the valve body.

[0010] Preferably, an outer sealing ring is sandwiched between the outer wall of the packing gland and the inner wall of the valve cover, and an inner sealing ring is sandwiched between the inner wall of the packing gland and the outer wall of the valve stem.

[0011] Preferably, the valve seat has a guide hole at one end near the valve cover, the guide hole connecting the inner hole of the valve cover and the mounting cavity, and the valve stem drives the valve core to slide axially to block or expose the inner hole of the valve seat.

[0012] Preferably, the hydrogen delivery regulating valve further includes an actuator connected to the other end of the valve stem, the actuator being configured to drive the valve stem to reciprocate along its axial direction.

[0013] The beneficial effects of this utility model are:

[0014] This utility model provides a hydrogen delivery regulating valve. A medium flow channel is formed inside the valve body. A valve cover is installed on the valve body and cooperates with the valve body to form an installation cavity communicating with the medium flow channel. A valve seat is installed in the installation cavity. A valve core is sealed and inserted into the inner hole of the valve seat. A valve stem is sealed and inserted into the inner hole of the valve cover, with one end of the valve stem connected to the valve core. The valve seat, valve cover, valve core, and valve stem are coaxially arranged and perpendicular to the flow direction of the medium flow channel. The valve stem drives the valve core to slide axially. The valve core blocks or exposes the inner hole of the valve seat, blocking or connecting the medium flow channel. A clamp is formed between the valve cover and the valve stem. A packing seal ring is provided, and a packing gland is inserted and connected to the end of the valve cover away from the valve body. The valve stem seal is inserted into the packing gland. The packing gland can compress the packing seal ring, which is deformed by compression and seals the gap between the valve cover and the valve stem, ensuring the sealing effect between the valve cover and the valve stem and preventing hydrogen leakage. Furthermore, the valve body, valve cover, valve seat, valve core, valve stem, and packing gland are made of high-nickel alloy, austenitic stainless steel, or titanium alloy, which have good resistance to hydrogen embrittlement, avoiding hydrogen embrittlement during hydrogen transportation and reducing safety hazards. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a hydrogen delivery regulating valve provided in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the valve cover provided in an embodiment of the present utility model;

[0017] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 4 This is a schematic diagram of the packing gland provided in an embodiment of the present invention.

[0019] In the picture:

[0020] 1. Valve body; 11. Medium flow channel; 12. Mounting cavity; 2. Valve cover; 21. Valve cover sealing ring; 22. Annular groove; 23. Mounting groove; 3. Valve seat; 31. Guide hole; 32. Valve seat sealing ring; 4. Valve core; 5. Valve stem; 6. Actuator; 7. Packing seal ring; 8. Packing gland; 81. Outer sealing ring; 82. Inner sealing ring; 83. First pressure ring; 84. Second pressure ring; 9. Guide packing. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0025] This embodiment provides a hydrogen delivery regulating valve that can effectively prevent hydrogen from escaping during delivery, while also avoiding hydrogen embrittlement and reducing safety hazards.

[0026] Please see Figures 1 to 4 The hydrogen delivery regulating valve provided in this embodiment includes a valve body 1, a valve cover 2, a valve seat 3, a valve core 4, and a valve stem 5. An upstream flow channel and a downstream flow channel are spaced apart inside the valve body 1. The upstream and downstream flow channels are parallel in direction and cooperate to form a medium flow channel 11, through which hydrogen is delivered downstream. Furthermore, the valve cover 2 is fastened to the valve body 1 with screws, and the valve cover 2 and the valve body 1 cooperate to form an installation cavity 12. The installation cavity 12 is connected to the medium flow channel 11. Specifically, the installation cavity 12 is connected to the upstream channel. The valve seat 3 is fastened to the installation cavity 12 with screws. The valve core 4 is sealed and inserted into the inner hole of the valve seat 3. The outer wall of the valve core 4 forms a sealing surface. The sealing surface of the valve core 4 can circumferentially abut against the inner hole wall of the valve seat 3 to form a seal. The valve stem 5 is sealed and inserted into the inner hole of the valve cover 2, and one end of the valve stem 5 is connected to the valve core 4. The valve seat 3, valve cover 2, valve core 4 and valve stem 5 are coaxially arranged and all perpendicular to the flow direction of the medium flow channel 11.

[0027] With the above settings, the valve stem 5 drives the valve core 4 to slide axially, and the sealing surface of the valve core 4 abuts or separates from the inner wall of the valve seat 3 in a circumferential manner to block or expose the inner hole of the valve seat 3, thereby blocking the upstream flow channel and the downstream flow channel to stop hydrogen delivery, or connecting the upstream flow channel and the downstream flow channel to start hydrogen delivery.

[0028] In this embodiment, the valve body 1, valve cover 2, valve seat 3, valve core 4, and valve stem 5 are all made of high-nickel alloy, austenitic stainless steel, or titanium alloy, which have good resistance to hydrogen embrittlement, avoid hydrogen embrittlement during hydrogen transportation, and reduce safety hazards.

[0029] In this embodiment, the valve body 1 is an integrated structure with no extra external leakage points, which improves the safety performance of the valve body 1.

[0030] Preferably, please refer to Figure 1 and Figure 2The valve cover 2 has an annular groove 22 at its end, which surrounds the outer side of the inner hole of the valve cover 2. The outer wall of the valve seat 3 at its end circumferentially abuts against the groove wall of the annular groove 22, and the bottom wall of the valve seat 3 at its end circumferentially abuts against the bottom wall of the annular groove 22. Through the above arrangement, the valve cover 2 and the valve seat 3 are fixedly assembled.

[0031] Furthermore, a guide hole 31 is provided at one end of the valve seat 3 near the valve cover 2. The guide hole 31 connects the inner hole of the valve cover 2 with the mounting cavity 12. The valve stem 5 drives the valve core 4 to slide axially. The sealing surface of the valve core 4 abuts or separates circumferentially from the inner wall of the valve seat 3 to block or expose the inner hole of the valve seat 3, thereby connecting or blocking the inner hole of the valve cover 2 with the mounting cavity 12, realizing the blocking or connection between the upstream and downstream flow channels. By providing a guide hole 31 on the valve seat 3, the flow of the medium is rectified, thereby achieving noise reduction.

[0032] Furthermore, the hydrogen delivery regulating valve also includes an actuator 6. The other end of the valve stem 5 extends through the valve cover 2 and is connected to the actuator 6. The actuator 6 is configured to drive the valve stem 5 to slide back and forth along its axial direction, thereby driving the valve core 4 to slide back and forth along its axial direction. Optionally, the actuator 6 can be an electric push rod, a hydraulic cylinder, or a pneumatic cylinder, as long as it can drive the valve stem 5 to slide back and forth along its axial direction; no specific limitation is made here.

[0033] For example, please continue reading Figure 1 A valve seat sealing ring 32 is sandwiched between the outer wall of the valve seat 3 and the inner wall of the valve body 1. By setting the valve seat sealing ring 32, the sealing effect of the mating surface between the valve seat 3 and the valve body 1 is enhanced, ensuring that hydrogen gas cannot leak downstream through the mating surface between the valve seat 3 and the valve body 1 when the valve is closed. Preferably, a plurality of valve seat sealing rings 32 are sandwiched axially between the outer wall of the valve seat 3 and the inner wall of the valve body 1 to further enhance the sealing effect of the mating surface between the valve seat 3 and the valve body 1.

[0034] For example, please continue reading Figure 1 A valve cover sealing ring 21 is sandwiched between the outer wall of the valve cover 2 and the inner wall of the valve body 1. By setting the valve cover sealing ring 21, the sealing effect between the valve cover 2 and the valve body 1 is enhanced, preventing hydrogen from escaping through the gap between the valve cover 2 and the valve body 1. Preferably, a plurality of valve cover sealing rings 21 are sandwiched axially between the outer wall of the valve cover 2 and the inner wall of the valve body 1 to further enhance the sealing effect between the valve cover 2 and the valve body 1 and prevent hydrogen from escaping.

[0035] Please see Figure 1 and Figure 3 The hydrogen delivery regulating valve provided in this embodiment also includes a packing seal ring 7. Specifically, the packing seal ring 7 is sandwiched between the valve cover 2 and the valve stem 5, which can enhance the sealing effect between the valve cover 2 and the valve stem 5, thereby preventing hydrogen from escaping through the gap between the valve cover 2 and the valve stem 5.

[0036] Furthermore, the packing seal 7 is a spring-energy-storing seal ring, which includes an elastic ring and embeds several compression springs within it. These compression springs apply continuous pressure to the elastic ring. Through this design, even if the elastic ring wears down after prolonged use, the compensating effect of the compression springs ensures a good seal between the valve cover 2 and the valve stem 5.

[0037] For example, the elastic ring is made of an elastic material, such as corrosion-resistant and wear-resistant polytetrafluoroethylene (PTFE) or rubber.

[0038] For more information on compatible locations, please refer to the following: Figure 1 and Figure 3 A packing gland 8 is sealed and inserted at the end of the valve cover 2 furthest from the valve body 1. The packing gland 8 is coaxially arranged with the valve stem 5. Furthermore, the packing gland 8 is securely connected to the valve cover 2, and the other end of the valve stem 5 is sequentially sealed and inserted into the valve cover 2 and the packing gland 8, extending out to connect to the actuator 6. By setting the packing gland 8, on the one hand, the packing seal ring 7 can be prevented from flying out; on the other hand, the packing gland 8 can apply pressure to the packing seal ring 7, causing it to be squeezed and deformed, thereby sealing the gap between the valve cover 2 and the valve stem 5 and ensuring a sealing effect.

[0039] For example, please refer to Figure 1 and Figure 2 An installation groove 23 is provided in the inner hole of the valve cover 2. The packing seal ring 7 is placed in the installation groove 23. Under the pressure applied by the packing gland 8 to the packing seal ring 7, the bottom of the packing seal ring 7 circumferentially abuts against the bottom of the installation groove 23.

[0040] Preferably, the packing gland 8 is made of high-nickel alloy, austenitic stainless steel or titanium alloy, which has good resistance to hydrogen embrittlement, avoids hydrogen embrittlement during hydrogen transportation and reduces safety hazards.

[0041] Further, please refer to Figure 3 and Figure 4 An outer sealing ring 81 is sandwiched between the outer wall of the packing gland 8 and the inner wall of the valve cover 2, and an inner sealing ring 82 is sandwiched between the inner wall of the packing gland 8 and the outer wall of the valve stem 5, thereby achieving a sealed assembly between the packing gland 8, the valve stem 5, and the valve cover 2. Based on the packing sealing ring 7, the sealing performance is further improved to prevent hydrogen from escaping.

[0042] In some feasible embodiments, the packing gland 8 includes a first pressure ring 83 and a second pressure ring 84 coaxially connected. The diameter of the first pressure ring 83 is smaller than the diameter of the second pressure ring 84. The upper end of the valve cover 2 is provided with an inner hole. The first pressure ring 83 is inserted into the inner hole of the valve cover 2, and the second pressure ring 84 is fastened to the upper end of the valve cover 2 by screws.

[0043] Preferably, the outer sealing ring 81 is sandwiched between the outer wall of the first pressure ring 83 and the inner wall of the valve cover 2, and the inner sealing ring 82 is sandwiched between the inner wall of the second pressure ring 84 and the outer wall of the valve stem 5.

[0044] For further information, please continue reading. Figure 1 and Figure 3 The hydrogen delivery regulating valve provided in this embodiment also includes a guide packing 9, which is used to support the axial reciprocating sliding of the valve stem 5. Specifically, the guide packing 9 is disposed in the mounting groove 23, and is sandwiched between the valve cover 2 and the valve stem 5. One end of the guide packing 9 circumferentially abuts against the first pressure ring 83 of the packing gland 8, and the other end circumferentially abuts against the packing seal ring 7. The first pressure ring 83 of the packing gland 8 squeezes the guide packing 9, and the guide packing 9 squeezes the packing seal ring 7.

[0045] During assembly, the first pressure ring 83 is inserted into the inner hole of the valve cover 2, and the second pressure ring 84 is fastened to the upper end of the valve cover 2 with screws. During this process, the first pressure ring 83 squeezes the guide packing 9, the guide packing 9 squeezes the packing seal ring 7, the packing seal ring 7 deforms and seals the gap between the valve cover 2 and the valve stem 5, ensuring the sealing effect and preventing hydrogen from escaping.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hydrogen delivery regulating valve, characterized in that, The valve includes a valve body (1), a valve cover (2), a valve seat (3), a valve core (4), a valve stem (5), a packing seal ring (7), and a packing gland (8). The valve body (1) has an internal medium flow channel (11). The valve cover (2) is installed on the valve body (1) and cooperates with the valve body (1) to form an installation cavity (12) communicating with the medium flow channel (11). The valve seat (3) is installed in the installation cavity (12). The valve core (4) is sealed and inserted into the inner hole of the valve seat (3). The valve stem (5) is sealed and inserted into the inner hole of the valve cover (2), and one end of the valve stem (5) is connected to the valve core (4). The valve seat (3) and the valve cover (2) are also connected. The valve core (4) and the valve stem (5) are coaxially arranged and perpendicular to the flow direction of the medium flow channel (11). The packing seal ring (7) is sandwiched between the valve cover (2) and the valve stem (5). The packing gland (8) is sealed and inserted into and connected to the end of the valve cover (2) away from the valve body (1). The valve stem (5) is sealed and inserted into the packing gland (8). The packing gland (8) is configured to compress the packing seal ring (7). The valve body (1), the valve cover (2), the valve seat (3), the valve core (4), the valve stem (5) and the packing gland (8) are made of high-nickel alloy, austenitic stainless steel or titanium alloy.

2. The hydrogen delivery regulating valve according to claim 1, characterized in that, The packing seal (7) is a spring energy storage seal, which includes an elastic ring and a plurality of compression springs embedded in the elastic ring. The compression springs are used to apply force to the elastic ring.

3. The hydrogen delivery regulating valve according to claim 1, characterized in that, The hydrogen delivery regulating valve also includes a guide packing (9), which is sandwiched between the valve cover (2) and the valve stem (5). One end of the guide packing (9) circumferentially abuts against the packing gland (8), and the other end circumferentially abuts against the packing seal ring (7).

4. A hydrogen delivery regulating valve according to claim 1, characterized in that, A valve seat sealing ring (32) is sandwiched between the outer wall of the valve seat (3) and the inner wall of the valve body (1), and a valve cover sealing ring (21) is sandwiched between the outer wall of the valve cover (2) and the inner wall of the valve body (1).

5. A hydrogen delivery regulating valve according to claim 1, characterized in that, An outer sealing ring (81) is sandwiched between the outer wall of the packing gland (8) and the inner wall of the valve cover (2), and an inner sealing ring (82) is sandwiched between the inner wall of the packing gland (8) and the outer wall of the valve stem (5).

6. A hydrogen delivery regulating valve according to any one of claims 1-5, characterized in that, The valve seat (3) has a guide hole (31) at one end near the valve cover (2). The guide hole (31) connects the inner hole of the valve cover (2) with the mounting cavity (12). The valve stem (5) drives the valve core (4) to slide axially to block or expose the inner hole of the valve seat (3).

7. A hydrogen delivery regulating valve according to any one of claims 1-5, characterized in that, The hydrogen delivery regulating valve also includes an actuator (6), which is connected to the other end of the valve stem (5). The actuator (6) is configured to drive the valve stem (5) to drive the valve core (4) to slide back and forth along its axial direction.

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