CN216112360U

CN216112360U - Check valve and hydrogen storage system

Info

Publication number: CN216112360U
Application number: CN202122613298.1U
Authority: CN
Inventors: 李宁; 王东雨; 李家豪
Original assignee: Weishi Energy Technology Co Ltd
Current assignee: Weishi Energy Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-03-22
Anticipated expiration: 2031-10-28

Abstract

The utility model relates to the technical field of hydrogen storage systems, and particularly discloses a one-way valve and a hydrogen storage system. The valve seat is provided with a through hole, the valve core is arranged in the through hole, the valve core divides the through hole into a first cavity and a second cavity, and the valve core comprises a first positioning surface and a second positioning surface; the fixing piece is located the first intracavity and with disk seat fixed connection, the fixing piece supports along the axial of through-hole and presses the second locating surface to support tightly first locating surface and the inner wall of through-hole, so can guarantee the position stability of case, the case is configured to only allow fluid medium to flow to the second chamber through the case by the first chamber, and the accessible case prevents outside dust or rivers from flowing into safe discharge line, with the reliability of guaranteeing hydrogen storage safety discharge system.

Description

Check valve and hydrogen storage system

Technical Field

The utility model relates to the technical field of hydrogen storage systems, in particular to a one-way valve and a hydrogen storage system.

Background

The vehicle-mounted hydrogen storage system needs to arrange a safety discharge pipeline on the pressure reducing valve and the cylinder valve, so that the gas cylinder and the pressure reducing valve can discharge hydrogen to the safe part outside a vehicle body quickly through the safety discharge pipeline when danger occurs, the safety discharge pipeline needs to ensure smoothness of the pipeline, and the safety discharge pipeline cannot be blocked by external dirt and rainwater so as to avoid risk of safety discharge.

In contrast, in the prior art, an elastic protective cap is usually sleeved at the end of the pipeline, but the protective cap is easy to fall off under the action of the pressure generated by the accumulated gas in the pipeline, and the accumulated hydrogen generated in the system cannot be discharged in time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: the one-way valve and the hydrogen storage system are provided, and have high reliability.

In one aspect, the present invention provides a check valve comprising:

a valve seat having a through hole;

the valve core is arranged in the through hole and divides the through hole into a first cavity and a second cavity, the valve core is configured to only allow fluid medium to flow from the first cavity to the second cavity through the valve core, and the valve core comprises a first positioning surface and a second positioning surface;

and the fixing piece is positioned in the first cavity and fixedly connected with the valve seat, and the fixing piece is abutted against the second positioning surface along the axial direction of the through hole so as to tightly abut the first positioning surface against the inner wall of the through hole.

As a preferred technical solution of the check valve, one of the cavity wall of the first cavity and the outer circumferential surface of the fixing member is provided with a clamping protrusion, and the clamping protrusion abuts against the other of the cavity wall of the first cavity and the outer circumferential surface of the fixing member;

the fixing member has a communication hole communicating with the first chamber, and the valve core has a flow passage communicating with the communication hole and selectively communicating with the second chamber.

According to the preferable technical scheme of the check valve, a clamping groove is formed in one of the wall of the first cavity and the outer peripheral surface of the fixing piece, a clamping protrusion is formed in the other of the wall of the first cavity and the outer peripheral surface of the fixing piece, and the clamping protrusion is clamped in the clamping groove.

As a preferred technical scheme of the one-way valve, the clamping protrusion is provided with a limiting surface and a guide surface which is arranged at an angle with the limiting surface, the guide surface is close to the valve core relative to the limiting surface, the limiting surface is perpendicular to the central line of the first cavity, and the limiting surface is attached to the groove wall of the clamping groove.

As a preferred technical scheme of the check valve, the valve core is made of an elastic material, the valve core comprises a cylindrical valve core body and a one-way conduction part arranged at one end of the valve core body, and the first positioning surface and the second positioning surface are arranged on the valve core body;

the one-way conduction part comprises a plurality of valve clacks uniformly distributed along the circumferential direction of the valve core body, a valve port is formed between every two adjacent valve clacks, the length direction of the valve port is perpendicular to the axial direction of the valve core body, and the valve port is in a normally closed state.

As a preferable technical scheme of the one-way valve, the number of the valve clacks is at least three, and one ends of the valve ports close to the central line of the valve core body are mutually communicated.

As a preferable technical solution of the check valve, the second positioning surface is a conical surface.

As a preferable technical scheme of the one-way valve, the outer peripheral surface of the valve seat is provided with an external thread.

As a preferable technical scheme of the check valve, the outer peripheral surface of the valve seat is provided with a clamping part used for being matched with a wrench.

In another aspect, the present invention provides a hydrogen storage system, which includes a safety release line and the check valve in any of the above aspects, wherein the valve seat is installed on the safety release line, and the first cavity is communicated with the safety release line.

The utility model has the beneficial effects that:

the utility model provides a one-way valve and a hydrogen storage system. The valve seat is provided with a through hole, the valve core is arranged in the through hole, the valve core divides the through hole into a first cavity and a second cavity, and the valve core comprises a first positioning surface and a second positioning surface; the fixing piece is located the first intracavity and with disk seat fixed connection, the fixing piece supports along the axial of through-hole and presses the second locating surface to support tightly first locating surface and the inner wall of through-hole, so can guarantee the position stability of case, the case is configured to only allow fluid medium to flow to the second chamber through the case by the first chamber, and the accessible case prevents outside dust or rivers from flowing into safe discharge line, with the reliability of guaranteeing hydrogen storage safety discharge system.

Drawings

FIG. 1 is a schematic view of a check valve according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of a check valve in an embodiment of the present invention;

FIG. 3 is a first schematic structural diagram of a valve element of the check valve according to an embodiment of the present invention;

FIG. 4 is a second schematic structural diagram of a valve element of the check valve according to the embodiment of the present invention;

FIG. 5 is a first schematic structural view of a valve seat of the check valve in an embodiment of the present invention;

FIG. 6 is a second schematic structural view of a valve seat of the check valve in the embodiment of the present invention;

FIG. 7 is a schematic view of a retaining member of a check valve in an embodiment of the present invention;

FIG. 8 is a schematic view of a portion of a retaining member of a check valve in accordance with an embodiment of the present invention;

FIG. 9 is a schematic structural view of a check valve and a safety vent line in an embodiment of the present invention;

fig. 10 is a schematic structural view of a check valve, a safety vent line and a seal according to an embodiment of the present invention.

In the figure:

1. a valve seat; 11. a first chamber; 12. a second chamber; 13. a limiting bulge; 14. a card slot; 15. an external thread; 16. a clamping portion;

2. a valve core; 21. a valve core body; 211. a first positioning surface; 212. a second positioning surface; 213. a housing; 214. a flange; 22. a one-way conduction part; 221. a valve flap; 222. a valve port; 2211. a valve plate; 2212. a first side; 2213. a second edge; 2214. a third side;

3. a fixing member; 31. a front section; 32. a limiting section; 33. a tail section; 331. clamping convex; 3311. a limiting surface; 3312. a guide surface; 34. a step surface;

4. a nut;

5. a safety relief line;

6. and a seal.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The embodiment provides a check valve, which can be applied to a vehicle-mounted hydrogen storage system, in particular to a safety discharge pipeline 5 of a pressure reducing valve and/or a cylinder valve of the vehicle-mounted hydrogen storage system, so as to ensure that the cylinder valve and/or the pressure reducing valve rapidly discharges hydrogen to a safe part outside a vehicle body through the safety discharge pipeline 5 when a danger occurs, and thus, the driving safety is ensured.

Specifically, as shown in fig. 1 and 2, the check valve includes a valve seat 1 and a valve element 2.

The valve seat 1 is used for being installed on the safety relief pipeline 5, the valve seat 1 is provided with a through hole, the valve core 2 is arranged in the through hole and along the central line direction of the through hole, and the through hole comprises a first cavity 11 and a second cavity 12 which are positioned on two sides of the valve core 2; the spool 2 is configured to allow only a flow of fluid medium from the first chamber 11 to the second chamber 12 via the spool 2, and the spool 2 may prevent a flow of fluid medium from the second chamber 12 to the first chamber 11 via the spool 2. When valve seat 1 is installed in the safety relief pipeline 5, first chamber 11 and the safety relief pipeline 5 intercommunication, second chamber 12 intercommunication external atmosphere to accessible case 2 prevents outside dust or rivers from flowing into safety relief pipeline 5, can also guarantee simultaneously that hydrogen can discharge out the safety relief pipeline 5 through case 2. The fluid medium in this embodiment is specifically hydrogen in the safety release line 5 and external water, and in other embodiments, the fluid medium may also be other gases or liquids.

It will be appreciated that the valve member 2 may form a seal with the inner wall of the through bore to prevent gas in the first chamber 11 from flowing between the valve member 2 and the inner wall of the through bore to the second chamber 12. In this embodiment, the valve core 2 has a first positioning surface 211, and the first positioning surface 211 can be attached to the inner wall of the through hole to seal the valve core 2 and the inner wall of the through hole. In other embodiments, the valve core 2 may be disposed in the through hole with interference so as to achieve sealing between the valve core 2 and the inner wall of the through hole.

In order to seal the valve element 2 and the inner wall of the through hole, in this embodiment, the inner wall of the through hole of the valve seat 1 is convexly provided with a limiting protrusion 13, and the first positioning surface 211 is abutted to the limiting protrusion 13. In other embodiments, an annular protrusion structure may be disposed on the valve core 2, an annular groove structure may be disposed on the inner wall of the through hole, and the first positioning surface 211 is located on the protrusion structure, and is inserted into the groove structure through the protrusion structure, so that the first positioning surface 211 and the side wall of the groove structure are also attached to each other.

The limiting protrusions 13 can be arranged according to specific needs, and the limiting protrusions 13 can be annular blocks protruding out of the inner wall of the through hole or a plurality of protruding blocks protruding out of the inner wall of the through hole and arranged at intervals along the circumferential direction of the through hole. Specifically, in this embodiment, the limiting protrusion 13 is a ring-shaped block protruding from the inner wall of the through hole, and along the center line direction of the through hole, one end of the ring-shaped block is flush with one end of the through hole, and the other end of the ring-shaped block is located in the through hole, that is, the through hole is a stepped hole.

In order to ensure the sealing effect between the valve core 2 and the inner wall of the through hole, the check valve further comprises a fixing part 3, the fixing part 3 is arranged in the first cavity 11 and is fixedly connected with the valve seat 1, and the fixing part 3 supports against the valve core 2 along the axial direction of the through hole so as to support the first positioning surface 211 of the valve core 2 and the inner wall of the through hole tightly. And mounting 3 and base 1 fixed connection to guarantee that mounting 3 and base 1's relative position is stable, and then guarantee to compress tightly effect and sealed effect.

Specifically, the valve element 2 also has a second positioning surface 212. Along the axial of through-hole, mounting 3 and second locating surface 212 butt, accessible mounting 3 and spacing arch 13 restriction case 2 are in the position in the through-hole. In the embodiment, the first positioning surface 211 and the second positioning surface 212 are axially arranged at intervals along the through hole, the valve core 2 is pressed against the limiting protrusion 13 through the fixing member 3, so that end face sealing can be formed between the second positioning surface 212 of the valve core 2 and the fixing member 3, and meanwhile, end face sealing can also be formed between the first positioning surface 211 of the valve core 2 and the limiting protrusion 13; particularly, the end face seal formed between the first positioning surface 211 of the valve core 2 and the limiting bulge 13 can prevent the fluid media in the first cavity 11 and the second cavity 12 from communicating between the valve core 2 and the side wall of the through hole, and ensure the one-way sealing effect of the one-way valve.

It is noted that the fixation member 3 does not influence the flow of the fluid medium from the first chamber 11 to the second chamber 12 via the non-return valve 2. Specifically, in the present embodiment, the fixing member 3 has a communication hole communicating with the first chamber 11, and the valve body 2 has a flow passage communicating with the communication hole and selectively communicating with the second chamber 12.

Compared with the protective cap in the prior art, the one-way valve provided by the embodiment has the advantages that the position of the valve core 2 is limited by the valve seat 1 and the fixing part 3, the position can be kept stable, the position of the valve core 2 cannot be influenced by the pressure of hydrogen in the safety discharge pipeline 5 and cannot be influenced by environmental factors, and the reliability of a hydrogen storage safety discharge system can be ensured.

As shown in fig. 2 and 3, the second positioning surface 212 is a conical surface. Accordingly, the surface of the fixing member 3 that abuts against the second positioning surface 212 is also a conical surface. So set up, when mounting 3 is installed to disk seat 1, second locating surface 212 plays the guide effect to can guarantee the concentricity of mounting 3 and case 2, with the stability that improves the product.

In this embodiment, the valve core 2 is made of an elastic material, preferably a rubber material, and is integrally injection-molded, and other elastic plastic materials may be selected according to the requirement. Therefore, after the valve core 2 is attached to the valve seat 1 and the fixing part 3, the sealing effect of two end face seals between the second positioning surface 212 of the valve core 2 and the fixing part 3 and between the first positioning surface 211 of the valve core 2 and the limiting protrusion 13 can be ensured to be stable. Preferably, the outer peripheral surface of the portion of the valve core 2 located between the first positioning surface 211 and the second positioning surface 212 may also be attached to the inner wall of the through hole, so as to further enhance the sealing effect, and thus, gaps may be prevented from being generated between the valve core 2 and the valve seat 1 and between the valve core 2 and the fixing member 3. In other embodiments, the valve core 2 may be replaced by a mechanical valve core 2.

As shown in fig. 3 and 4, the valve body 2 includes a cylindrical valve body 21 and a one-way conduction portion 22 provided at one end of the valve body 21, and both the first positioning surface 211 and the second positioning surface 212 are provided at the valve body 21, specifically, the valve body 21 includes a cylindrical outer shell 213 and a flange 214 having an annular outer peripheral surface protruding at one end in the axial direction of the outer shell 213. The one-way conduction part 22 is disposed at the other axial end of the housing 213, the first positioning surface 211 is disposed at one axial end of the flange along the axial direction of the housing 213, and the second positioning surface 212 is an end surface of the housing 213 away from the one-way conduction part 22.

The one-way conduction portion 22 includes a plurality of valve flaps 221 uniformly distributed along the circumferential direction of the valve core body 21, a valve port 222 is formed between two adjacent valve flaps 221, and the length direction of the valve port 222 and the axial direction of the valve core body 21 form an included angle, wherein in this embodiment, the included angle is specifically 90 °, and in other embodiments, the included angle may also be set as needed.

Valve port 222 is normally closed. Specifically, the valve flap 221 includes two valve flaps 2211 connected at an included angle, the two valve flaps 2211 are respectively a first valve flap and a second valve flap, the first valve flap and the second valve flap are both triangular sheet bodies, the first valve flap and the second valve flap are connected through a first edge 2212, the first edge 2212 is connected with the inner surface of the shell 213 of the valve core body 21, the first valve flap and the second valve flap are both protruded towards the inside of the cylinder body, in the two adjacent valve flaps 221, a second edge 2213 of the first valve flap of one valve flap 221 is connected with a second edge 2213 of the second valve flap of the other valve flap 221, and a part of a third edge 2214 of the first valve flap and a third edge 2214 of the second valve flap are connected to form the valve port 222. Because the valve core 2 is made of elastic material, the third edge 2214 of the first valve plate of one valve clack 221 and the third edge 2214 of the second valve plate of the other valve clack 221 always have the movement trend of mutual fitting, and the two valve clacks can be fitted, so that the valve port 222 can be kept normally closed when the valve core 2 is not in operation.

When the check valve is installed in the safety release pipeline 5, when the pressure of hydrogen in the first cavity 11 is greater than the external atmospheric pressure, the pressure difference acts on the inner surfaces of the two valve sheets 2211 of each valve flap 221, and the two valve sheets 2211 of each valve flap 221 are urged to approach each other, so that the valve port 222 between the two adjacent valve flaps 221 is expanded to open the valve port 222, and the hydrogen in the first cavity 11 can be discharged into the second cavity 12; when the pressure of the hydrogen gas in the first chamber 11 is lower than the atmospheric pressure, the pressure difference acts on the outer surfaces of the two valve sheets 2211 of each valve flap 221, so as to force the two valve sheets 2211 of each valve flap 221 to move away from each other, so that the valve port 222 between the two adjacent valve flaps 221 is further tightened, the valve port 222 is closed more firmly, and the external dust or water is prevented from entering the first chamber 11 from the valve port 222 through the second chamber 12.

In this embodiment, the number of the valve flaps 221 is not limited, two valve flaps 221 may be provided, the one-way conduction portion 22 is of a duckbill structure as a whole, at least three valve flaps 221 may be provided, and one ends of the plurality of valve ports 222 close to the center line of the valve core body 21 are communicated with each other. In the embodiment, the number of the valve flaps 221 is four, and the four valve ports 222 are arranged in a cross shape.

As shown in fig. 5, the outer circumferential surface of the valve seat 1 is provided with an external thread 15 so as to connect the valve seat 1 and the safety vent line 5 by screw-fitting. Further, the outer peripheral surface of the valve seat 1 is provided with a clamping portion 16 for engagement with a wrench. Screwing of the valve seat 1 can be facilitated. Wherein the clamping portion 16 comprises at least two parallel clamping surfaces arranged at a distance. In the present embodiment, the clamping portion 16 includes six clamping surfaces, and the six clamping surfaces are regular hexagons as a whole.

As shown in fig. 5 to 8, in order to realize stable connection between the fixing member 3 and the valve seat 1, the embodiment exemplarily provides that a clamping protrusion 331 is provided on the outer peripheral surface of the fixing member 3, and the clamping protrusion 331 abuts against the cavity wall of the first cavity 11 to realize fixed connection between the fixing member 3 and the valve seat 1. As shown in fig. 5, the convex clip 331 and the cavity wall of the first cavity 11 may be in interference fit; as shown in fig. 6, the locking protrusion 331 and the cavity wall of the first cavity 11 can also be in a snap fit, and when the locking protrusion 331 and the cavity wall of the first cavity 11 are in the snap fit, a locking groove 14 can be disposed on the cavity wall of the first cavity 11, and the locking protrusion 331 is locked in the locking groove 14, so that the fixing member 3 is installed on the valve seat 1. In other embodiments, the locking protrusion 331 may be disposed on the wall of the first cavity 11, and the locking protrusion 331 abuts against the outer circumferential surface of the fixing member 3.

As an alternative thereto, the fixing element 3 may also be screwed to the valve seat 1, as a result of which a stable connection between the fixing element 3 and the valve seat 1 is likewise achieved.

Optionally, as shown in fig. 8, the locking protrusion 331 has a position-limiting surface 3311 and a guiding surface 3312 disposed at an angle to the position-limiting surface 3311, the guiding surface 3312 is close to the valve core 2 relative to the position-limiting surface 3311, the position-limiting surface 3311 is perpendicular to the central line of the first cavity 11, and the position-limiting surface 3311 is attached to the groove wall of the locking groove 14. So set up, the longitudinal section of card arch 331 is triangle-shaped, and the slot wall laminating through locating part and draw-in groove 14 can guarantee that the joint effect of card arch 331 and draw-in groove 14 is stable, through setting up spigot surface 3312, then is convenient for fill in first chamber 11 with mounting 3 from the opening of first chamber 11.

In this embodiment, the fixing member 3 includes a front section 31, a limiting section 32, and a rear section 33 connected in this order along the axial direction thereof. Wherein, forepart 31 inserts to the case body 21 of case 2 and the outer peripheral face of forepart 31 and the inner wall laminating of case body 21, and the outer peripheral face of spacing section 32 is conical and laminates with second locating surface 212, and the back end 33 is located first chamber 11, and blocks protruding 331 and set up in back end 33. Specifically, the outer diameter of the front section 31 is smaller than that of the tail section 33, the minimum outer diameter of the limiting section 32 is equal to that of the front section 31, and the maximum outer diameter of the limiting section 32 is smaller than that of the tail section 33, so that a step surface 34 is formed between the limiting section 32 and the tail section 33, the step surface 34 abuts against the end surface of the valve element 2, and the limiting effect on the valve element 2 can be further enhanced.

As shown in fig. 9 and 10, the present embodiment further provides a hydrogen storage system, the hydrogen storage system includes a safety release line 5 and the check valve in the above solution, the valve seat 1 is installed on the safety release line 5, and the first cavity 11 is communicated with the safety release line 5.

Specifically, the hydrogen storage system further comprises a nut 4 and a sealing element 6, wherein the nut 4 is arranged on the safety release pipeline 5, the nut 4 is in threaded connection with the valve seat 1, and the sealing element 6 is at least partially positioned between the valve seat 1 and the safety release pipeline 5. Through with

disk seat

1 and 4 screw-thread fit of nut, convenient to detach check valve, and can guarantee the leakproofness between check valve and safe bleeder line 5 through setting up sealing member 6.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A check valve, comprising:

a valve seat (1), the valve seat (1) having a through hole;

a spool (2), the spool (2) being disposed within the through-hole and dividing the through-hole into a first chamber (11) and a second chamber (12), the spool (2) being configured to only allow fluid medium to flow from the first chamber (11) to the second chamber (12) via the spool (2), the spool (2) comprising a first locating surface (211) and a second locating surface (212);

and the fixing piece (3) is positioned in the first cavity (11) and fixedly connected with the valve seat (1), and the fixing piece (3) is abutted against the second positioning surface (212) along the axial direction of the through hole so as to tightly abut against the first positioning surface and the inner wall of the through hole.

2. The check valve according to claim 1, characterized in that one of the cavity wall of the first cavity (11) and the outer circumferential surface of the fixing member (3) is provided with a snap projection (331), and the snap projection (331) abuts against the other of the cavity wall of the first cavity (11) and the outer circumferential surface of the fixing member (3);

the fixing member (3) has a communication hole communicating with the first chamber (11), and the valve element (2) has a flow passage communicating with the communication hole and selectively communicating with the second chamber (12).

3. The check valve according to claim 2, characterized in that one of the cavity wall of the first cavity (11) and the outer peripheral surface of the fixing member (3) is provided with a locking groove (14), and the other of the cavity wall and the outer peripheral surface is provided with a locking protrusion (331), and the locking protrusion (331) is locked in the locking groove (14).

4. The check valve of claim 3, wherein the locking protrusion (331) has a position-limiting surface (3311) and a guiding surface (3312) disposed at an angle to the position-limiting surface (3311), the guiding surface (3312) is close to the valve core (2) relative to the position-limiting surface (3311), the position-limiting surface (3311) is perpendicular to the center line of the first cavity (11), and the position-limiting surface (3311) is attached to the groove wall of the locking groove (14).

5. The check valve according to claim 1, wherein the spool (2) is made of an elastic material, the spool (2) includes a spool body (21) having a cylindrical shape and a one-way conduction portion (22) provided at one end of the spool body (21), and the first positioning surface (211) and the second positioning surface (212) are provided at the spool body (21);

the one-way conduction part (22) comprises a plurality of valve clacks (221) which are uniformly distributed along the circumferential direction of the valve core body (21), a valve port (222) is formed between every two adjacent valve clacks (221), the length direction of the valve port (222) is perpendicular to the axial direction of the valve core body (21), and the valve port (222) is in a normally closed state.

6. The check valve according to claim 5, wherein the number of the valve flaps (221) is at least three, and one ends of the plurality of valve ports (222) near the center line of the spool body (21) communicate with each other.

7. The non-return valve according to any of claims 1 to 6, characterized in that the second positioning surface (212) is a conical surface.

8. The check valve according to any of claims 1-6, characterized in that the inner wall of the through hole is convexly provided with a limit projection (13), and the limit projection (13) abuts against the first locating surface (211) along the direction of the center line of the through hole.

9. A non-return valve according to any of claims 1-6, characterised in that the outer circumference of the valve seat (1) is provided with an external thread (15), and that the outer circumference of the valve seat (1) is provided with a grip (16) for engagement with a spanner.

10. A hydrogen storage system, characterized by comprising a safety relief line (5) and a one-way valve according to any of claims 1-9, said valve seat (1) being mounted to said safety relief line (5) and said first chamber (11) being in communication with said safety relief line (5).