70 mpa hydrogen refueling port for hydrogen fuel cell vehicle

Abstract

A 70 MPa hydrogen refueling port for a hydrogen fuel cell vehicle. The hydrogen refueling port comprises a main valve body (1) and an auxiliary valve body (2), the main valve body (1) being connected to the auxiliary valve body (2). The hydrogen refueling port further comprises a one-way valve structure provided in the hydrogen refueling port, the one-way valve structure comprising a one-way valve core (9) and two sealing structures, wherein a first feature of the one-way valve core (9) is in contact with a valve core sealing ring (8) to constitute a first sealing structure, and a second feature of the one-way valve core (9) is in contact with a sealing seat (7) to constitute a second sealing structure; a spring (10) is provided between the one-way valve core (9) and a support seat (11); and two sealing rings are provided inside a dustproof cover (3) of the hydrogen refueling port.

Description

A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle Technical Field

[0001] This invention belongs to the field of high-pressure valve technology for hydrogen fuel cell vehicles, and particularly relates to a 70MPa hydrogen refueling port for hydrogen fuel cell vehicles. Background Technology

[0002] Hydrogen energy has always been a focus of global energy attention, and fuel cell vehicles are an important area in the application and development of hydrogen energy. The hydrogen refueling port, which connects to the refueling nozzle to complete the refueling of the hydrogen system, is the primary component connecting the onboard hydrogen storage system of a hydrogen fuel cell vehicle to the hydrogen refueling station, and plays a crucial role. It should generally have functions such as connecting and matching refueling equipment, filtering impurities from the medium, one-way opening and closing, connecting to downstream pipelines, and preventing leaks.

[0003] In existing related technical solutions, the structure of sealing ring and one-way valve core is mostly used to complete the medium sealing. Since the hydrogen filling port needs to ensure good sealing performance within a wide range of working pressure (0.5MPa to 105MPa), using a single sealing ring is very likely to cause ineffective sealing at low pressure, while at high pressure the sealing ring is damaged due to excessive compression, thus creating a safety risk.

[0004] In existing related technical solutions, the valve internal seals mostly use sealing rings for sealing. However, these sealing rings are prone to aging after prolonged use, which can easily lead to leakage. Furthermore, the hydrogen filling port is directly exposed to the atmosphere, and due to the complex operating environment, it is easy for dust, impurities, and other foreign matter to adhere to it, which can easily cause malfunctions in the hydrogen filling process. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a 70MPa hydrogen refueling port for hydrogen fuel cell vehicles, thereby solving the problem of hydrogen leakage that easily occurs under operating conditions with a large pressure range in existing related technologies, and at least solving one of the background technology problems.

[0006] This invention provides the following technical solution:

[0007] A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle includes a main valve body and a secondary valve body, wherein the main valve body and the secondary valve body are connected.

[0008] It also includes a one-way valve structure installed in the hydrogenation port. The one-way valve structure includes a one-way valve core and two sealing structures. The first sealing structure is that the first feature of the one-way valve core contacts the valve core sealing ring, and the second sealing structure is that the second feature of the one-way valve contacts the sealing seat.

[0009] The hydrogen filling port uses a high-molecular elastic material as a sealing and support seat to isolate the internal cavity from the external environment;

[0010] A spring is provided between the one-way valve core and the support base;

[0011] The dust cover of the hydrogen filling port has two sealing rings inside. The first sealing ring is close to the filling end of the hydrogen filling port and matches the neck feature to achieve the anti-dislodge function. The second sealing ring is far away from the filling end, forming a larger chamber with the dust cover and matching the coverage area of ​​the hydrogen filling gun. The end of the dust cover has a small vent hole.

[0012] Preferably, the one-way valve core opens during hydrogen refueling under the action of hydrogen medium pressure overcoming spring force and downstream medium pressure. After refueling, it contacts the sealing seat under the downstream high-pressure medium pressure to form a sealing point.

[0013] Preferably, the sealing seat is made of high-performance composite material, has an interference fit with related parts, and forms an additional sealing point by plastic deformation through the annular protrusion at the top of the secondary valve body.

[0014] Preferably, the first sealing ring inside the dust cover is used to provide protection for the hydrogen refueling gun engagement area and to provide feedback on the installation position.

[0015] Preferably, the valve core sealing ring is made of a low-hardness elastic sealing material, and the sealing seat is made of a high-hardness elastic sealing material.

[0016] Preferably, a filter element is provided at the upstream end of the one-way valve core, and the filter element is disposed inside the hydrogen inlet.

[0017] Preferably, at the sealing position where the one-way valve core contacts the sealing seat, the sealing seat adopts a concave arc-shaped surface, and the one-way valve core corresponding to the arc-shaped surface has an annular ridge structure.

[0018] Preferably, the valve core sealing ring is disposed in an annular groove provided on the sealing seat, with the groove opening facing the one-way valve core side, and the height of the inner groove wall being lower than the height of the outer groove wall, so that the valve core sealing ring can contact and seal with the one-way valve core.

[0019] Preferably, a pair of through holes are symmetrically provided on the outer groove wall of the annular groove of the sealing seat along the axis of the sealing ring, which are used to balance the pressure between the inside and outside of the sealing ring and prevent the valve core sealing ring from being pressed out of the annular groove when the medium at the rear end is under high pressure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention discloses a 70MPa hydrogen refueling port for hydrogen fuel cell vehicles. It employs a double-sealing structure at the top of a one-way valve. The first sealing structure involves the first feature of the one-way valve core contacting a sealing (rectangular) ring, using a low-hardness sealing material to achieve good sealing performance even at low media pressures at the valve core's rear end. The second sealing structure involves the second feature of the one-way valve contacting an elastomer valve seat, using a higher-hardness sealing material to achieve sealing performance at higher pressures. This double-sealing structure ensures the valve core remains sealed under varying pressures, providing enhanced safety through a dual leak-proof design. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 is a schematic diagram of the cross-sectional structure of the hydrogenation port of the present invention.

[0024] Figure 2 is a partially enlarged structural schematic diagram of the present invention as shown in Figure 1.

[0025] The markings in the attached diagram are as follows: 1. Main valve body; 2. Sub-valve body; 3. Dust cover; 4. First sealing ring; 5. Second sealing ring; 6. Filter element; 7. Sealing seat; 8. Valve core sealing ring; 9. One-way valve core; 10. Spring; 11. Support seat; 12. Sealing point one between one-way valve core and valve core sealing ring; 13. Sealing point two between one-way valve core and valve core sealing ring; 14. Pressing mating surface; 15. Sealing point one between sub-valve body and sealing seat; 16. Sealing point two between sub-valve body and sealing seat; 17. Sealing point three between sub-valve body and sealing seat; 18. Annular protrusion structure; 19. Annular gap; 20. Through hole. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] Example 1:

[0030] Referring to Figures 1-2, a 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle includes a main valve body 1 and a secondary valve body 2, which are connected. It also includes a one-way valve structure disposed within the refueling port. The one-way valve structure includes a one-way valve core 9 and two sealing structures. The first sealing structure involves the first feature of the one-way valve core contacting the valve core sealing ring 8, forming a sealing point 12 between the one-way valve core and the valve core sealing ring. The second sealing structure involves the second feature of the one-way valve core contacting the sealing seat 7, forming a second sealing point 13 between the one-way valve core and the valve core sealing ring. The refueling port interior uses a high-polymer elastic material as the sealing seat 7 and support seat 11 to isolate the internal cavity from the external environment. A spring 10 is provided between the one-way valve core 9 and the support seat 11.

[0031] The dust cover 3 of the hydrogen filling port has two sealing rings inside. The first sealing ring 4 is close to the filling end of the hydrogen filling port and matches the neck feature to achieve an anti-detachment function. The second sealing ring 5 is away from the filling end, forming a larger chamber with the dust cover 3 and consistent with the coverage area of ​​the hydrogen filling gun. The dust cover 3 has a small vent hole at its end. During hydrogen filling, the one-way valve core opens under the action of hydrogen medium pressure overcoming the spring force of spring 10 and the pressure of the medium at the rear end. After filling, it contacts the sealing seat 7 under the pressure of the high-pressure medium at the rear end to form a sealing point. The sealing seat 7 is made of PEEK material and is interference-fitted with related parts. It also forms an additional sealing point through the annular protrusion at the top of the secondary valve body 2, which causes it to undergo plastic deformation. The first sealing ring 4 inside the dust cover 3 is used to provide protection for the hydrogen filling gun engagement part and to provide feedback on installation. The valve core sealing ring 8 is made of rubber, and the sealing seat 7 is made of polymer, plastic, and other materials. A filter element 6 is provided at the upstream end of the one-way valve core 9. The filter element 6 is located inside the hydrogen inlet and is mounted on a filter element seat. The end of the filter element seat has a radially outward flange. The radially outward flange is clamped by a stepped structure and a sealing seat 7 located inside the main valve body 1, and a pressing mating surface 14 is formed at the contact point with the sealing seat 7.

[0032] Example 2:

[0033] Based on Example 1, when hydrogen medium enters the internal pipeline of the hydrogen filling port through the hydrogen filling gun, it first passes through the internal channel. The pressure of the injected hydrogen medium overcomes the force of spring 10 and the force of the downstream medium pressure acting on the one-way valve core 9, causing the one-way valve core 9 to compress the spring and open. Then, it passes through the channel between the sealing seat 7 and the one-way valve core 9, as well as the support seat 11 and the auxiliary valve body 2, into the pipeline connected to the downstream end. When the medium filling is completed, the hydrogen filling gun cuts off the pressure, the pressure at the front end of the one-way valve core 9 decreases, and the valve core sealing ring 8 is compressed under the pressure of the downstream high-pressure medium and comes into contact with the sealing seat 7. The one-way valve core and the valve core sealing ring sealing point 2 13 are two sealing points. By setting an appropriate sealing ring size, the compression of the valve core sealing ring 8 is prevented from being too large. Therefore, at this time, the main sealing point is the one-way valve core and the valve core sealing ring sealing point 2 13. When the downstream medium is consumed or artificially released (e.g., during replacement or maintenance) to a lower pressure, the one-way valve core and the valve core sealing ring sealing point 12 can provide an effective seal. By employing a dual-sealing structure—one at the top of the check valve core and the other at the valve core sealing ring—the first sealing structure involves the first feature of the check valve core contacting the sealing (rectangular) ring, using a low-hardness rubber sealing material. This provides good sealing performance even at low media pressures at the rear of the valve core. The second sealing structure involves the second feature of the check valve contacting the elastomer valve seat, using a high-hardness PEEK sealing material to achieve sealing performance at higher pressures. This dual-sealing structure ensures: 1. Sealing of the valve core under varying pressures; 2. Enhanced safety through a double leak-proof structure. It solves the problem of the sealing ring being easily damaged under high pressure, leading to hydrogen leakage, thus improving structural safety and extending the service life of the hydrogen filling port.

[0034] To prevent media leakage caused by sealing ring aging, a high-performance material is used to manufacture the sealing seat. The structure and dimensions are designed to ensure a tight fit between the sealing seat 7 and related parts, and the excellent properties of PEEK material contribute to the sealing performance. During the media filling stage, leakage is primarily prevented through the sealing point 15 between the secondary valve body and the sealing seat. After filling, in addition to the sealing point 17 formed by the interference fit between the secondary valve body and the sealing seat, an annular protrusion is provided at the top of the secondary valve body 2 to cause plastic deformation of the sealing seat 7, forming a second sealing point 16 as a secondary seal to prevent leakage from the valve body. To further improve the sealing effect, an annular protrusion structure 18 is provided on the top surface of the annular protrusion at the top of the secondary valve body 2, used to press into the sealing seat 7 to cause plastic deformation and improve the sealing effect. Similarly, the valve core sealing ring 8 also forms a sealing structure within the groove of the sealing seat 7 through mutual contact surfaces to prevent media leakage. A high-polymer elastic material is used inside the hydrogen filling port as a sealing and support seat to isolate the internal cavity from the external environment. Multiple sealing positions are set on the same component, simplifying the structure and achieving multiple seals to further prevent media leakage. This reduces the number of sealing points inside the hydrogen filling port and reduces the risk of leakage caused by the aging of the sealing rings.

[0035] Two sealing rings are installed inside the dust cover 3. The first sealing ring 4 primarily protects the hydrogen refueling nozzle engagement area, provides feedback on the dust cover's installation position, and prevents detachment based on the ring's dimensions. The additional second sealing ring 5 increases the sealing area between the dust cover 3 and the main valve body 1, protecting more of the engagement area with the hydrogen refueling nozzle and preventing dust and other impurities from adhering to it, thus improving the structure's dustproof performance. Vent holes are provided at all sealed positions to ensure that the internal pressure does not change significantly during the insertion and removal of the dust cover. Two sealing rings are also installed inside the dust cover at the hydrogen refueling port. The first sealing ring is close to the filling end of the hydrogen refueling port and cooperates with the neck feature to prevent detachment. The second sealing ring is further away from the filling end, forming a larger chamber with the locking cap that is essentially the same as the hydrogen refueling nozzle's coverage area, preventing dust accumulation. A small vent hole is also provided at the locking cap end to ensure that there is no internal pressure change when the locking cap is installed or removed. This increases the protection of the hydrogen refueling port and improves the overall system's anti-contamination capability.

[0036] To further improve the sealing effect of the one-way valve core and the valve core sealing ring at sealing point 213, as shown in Figure 2, at the sealing position where the sealing seat 7 contacts the one-way valve core 9, the sealing seat 7 adopts a concave arc-shaped surface, and the one-way valve core 9 corresponding to the arc-shaped surface has an annular ridge structure. During use, under the pressure of the high-pressure medium at the rear end, the annular ridge structure on the one-way valve core 9 and the concave arc-shaped surface of the sealing seat 7 achieve line contact. Under the same force, the one-way valve core 9 acts on the sealing seat 7 on a very small contact area, which can generate a large contact specific pressure and greatly improve the sealing effect.

[0037] As a further optimization, the valve core sealing ring 8 is disposed within an annular groove on the sealing seat 7. The groove opening faces the one-way valve core, and the height of the inner groove wall is lower than the height of the outer groove wall, so that the valve core sealing ring can contact and seal with the one-way valve core 9 to form a sealing point 12 between the one-way valve core and the valve core sealing ring. In use, when the downstream medium is consumed or artificially released (e.g., during replacement or maintenance) to a lower pressure, an annular gap 19 is formed between the outer circumferential surface of the valve core sealing ring 8 and the wall of the outer groove.

[0038] As a further optimization, a pair of through holes 20 are symmetrically provided on the outer groove wall of the annular groove of the sealing seat 7 along the axis of the sealing ring. These holes are used to balance the pressure between the inside and outside of the sealing ring and prevent the valve core sealing ring 8 from being pressed out of the annular groove when the medium at the rear end is under high pressure.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle, characterized in that, It includes a main valve body (1) and a secondary valve body (2), wherein the main valve body (1) and the secondary valve body (2) are connected; It also includes a one-way valve structure set in the hydrogenation port. The one-way valve structure includes a one-way valve core (9) and two sealing structures. The first sealing structure is that the first feature of the one-way valve core contacts the valve core sealing ring (8), and the second sealing structure is that the second feature of the one-way valve contacts the sealing seat (7). The hydrogen filling port uses a high-molecular elastic material as a sealing seat (7) and a support seat (11) to isolate the internal cavity from the external environment; A spring (10) is provided between the one-way valve core (9) and the support base (11).

2. The 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, When hydrogen is added, the one-way valve core (9) opens under the action of the hydrogen medium pressure overcoming the elastic force of the spring (10) and the pressure of the downstream medium. After the addition is completed, the one-way valve core (9) contacts the sealing seat (7) under the pressure of the high-pressure medium at the downstream end to form a sealing point.

3. The 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The dust cover (3) of the hydrogen filling port is provided with two sealing rings inside. The first sealing ring (4) is close to the filling end of the hydrogen filling port and cooperates with the neck feature to achieve the anti-detachment function. The second sealing ring (5) is far away from the filling end, forming a larger chamber with the dust cover (3) and consistent with the coverage of the hydrogen filling gun. The end of the dust cover (3) is provided with a small vent hole.

4. The 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The sealing seat (7) is made of high-performance composite material, is interference-fitted with related parts, and undergoes plastic deformation through the annular protrusion at the top of the sub-valve body (2) to form an additional sealing point.

5. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The first sealing ring (4) inside the dust cover (3) is used to provide protection for the hydrogen refueling gun joint and to provide feedback on the installation position.

6. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The upstream end of the one-way valve core (9) is provided with a filter element (6), which is located inside the hydrogen filling port.

7. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The valve core sealing ring (8) is made of a low-hardness elastic sealing material, and the sealing seat (7) is made of a high-hardness elastic sealing material.

8. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, At the sealing position where the one-way valve core (9) contacts the sealing seat (7), the sealing seat (7) adopts a concave arc-shaped surface, and the one-way valve core (9) corresponding to the arc-shaped surface has an annular convex ridge structure.

9. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The valve core sealing ring (8) is set in the annular groove on the sealing seat (7). The groove opening faces the one-way valve core (9). The height of the inner groove wall is lower than the height of the outer groove wall so that the valve core sealing ring (8) can contact and seal with the one-way valve core (9).

10. A 70MPa hydrogen refueling port for a hydrogen fuel cell vehicle according to claim 9, characterized in that, On the outer groove wall of the annular groove of the sealing seat (7), a pair of through holes (20) are symmetrically provided along the axis of the sealing ring to balance the pressure between the inside and outside of the sealing ring and prevent the valve core sealing ring (8) from being pressed out of the annular groove when the medium at the rear end is under high pressure.

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