Hydrogenation port structure

Abstract

The utility model relates to vehicle -mounted hydrogen storage system technical field discloses a kind of hydrogen inlet structure, including valve body and valve cover, one end of the valve body is equipped for with hydrogen inlet, the other end is connected with the valve cover, the valve cover is equipped with hydrogen outlet away from one end of the valve body;The valve body inside is equipped with first cavity, the first cavity inside is equipped with end cap, the end cap is connected with valve seat in the side close to the valve cover, the valve seat is equipped with first sealing ring in the side close to the valve cover;The valve cover inside is equipped with second cavity, valve core assembly is installed in the second cavity, the valve core in the valve core assembly and the valve seat and the first sealing ring are all contact seal.The utility model is equipped with valve seat and first sealing ring, the valve core is all in contact with the first sealing ring and the valve seat sealing, realize two-stage sealing, ensure the sealing reliability in 0.5~70MPa wide pressure range.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted hydrogen storage system technology, and in particular to a hydrogen refueling port structure. Background Technology

[0002] Fuel cells can directly convert chemical energy into electrical energy, offering advantages such as high energy conversion efficiency, low pollution, wide availability of fuel sources, low noise, high reliability, and ease of maintenance. A typical fuel cell vehicle's on-board hydrogen storage system consists of a hydrogen refueling port, a high-pressure gas cylinder, a cylinder valve combination valve, a pressure reducing valve, a safety valve, a vent valve, a pressure sensor, and pipeline connectors. The hydrogen refueling port is the core component of the on-board hydrogen storage system, used to connect to the hydrogen refueling nozzle to fill the on-board hydrogen storage cylinder. To improve vehicle range, a 70MPa on-board hydrogen storage system is the future development trend for fuel cell vehicles. The hydrogen refueling port usually integrates a filter to prevent foreign matter from entering downstream valves and the fuel cell system.

[0003] The valve core seals in existing products are unreliable and cannot guarantee sealing reliability within a wide pressure range of 0.5 to 70 MPa, thus failing to meet the requirements for high-pressure hydrogen refueling at 70 MPa. Furthermore, the valve body and valve cover, as well as the valve body and valve seat seals, all use rubber sealing rings, which are prone to aging, hydrogen explosion, and hydrogen permeation after prolonged use. Utility Model Content

[0004] The present invention aims to at least solve the problems existing in the prior art, such as unreliable valve core sealing, and the fact that the valve body, valve cover, and valve body and valve seat seals are all made of rubber sealing rings, which are prone to aging, hydrogen explosion, and hydrogen permeation.

[0005] Therefore, one objective of this utility model is to provide a hydrogen filling port structure, including a valve body, a valve cover, a valve seat, and a valve core assembly. One end of the valve body is provided with a hydrogen filling port, and the other end is connected to the valve cover. The valve cover has a hydrogen outlet at the end away from the valve body. The valve seat and the valve core assembly are coaxially disposed within the valve cover. The valve core assembly includes a valve core, which is movably connected to the valve seat. The valve seat has a valve port that mates with the valve core. The valve port has a first sealing part, and one end of the valve core has a second sealing part that mates with the first sealing part. A first sealing ring is also connected between the valve core and the valve seat.

[0006] In some embodiments, the valve body has a first cavity inside, an end cap is provided inside the first cavity, a first stepped surface is provided inside the first cavity, and the first stepped surface is connected to the end cap by a boss.

[0007] In some embodiments, the end cap and the valve cover are connected by a boss.

[0008] In some embodiments, the end cap and the valve seat are connected by a boss.

[0009] In some embodiments, a filter is connected to the side of the end cap near the hydrogen inlet, and a first gas passage is formed between the filter and the inner wall of the valve body. The filter includes a filter support and a filter screen, the filter screen is installed on the filter support, and the interior of the filter communicates with the hydrogen outlet.

[0010] In some embodiments, the valve cover has a second cavity, in which the valve core assembly is disposed. The valve core assembly includes a guide sleeve, and a third cavity is disposed inside the guide sleeve. A spring is connected to the third cavity, and the valve core is sleeved on the spring. The valve core is slidably connected to the guide sleeve.

[0011] In some embodiments, a second gas channel is provided on the outer side of the guide sleeve, and the hydrogen filling port, the second gas channel, and the hydrogen outlet are interconnected.

[0012] In some embodiments, the shape of the first sealing portion is adapted to the shape of the second sealing portion.

[0013] In some embodiments, the first sealing portion is a spherical structure or a conical structure.

[0014] In some embodiments, the valve body is made of austenitic stainless steel 316L; the valve core is made of 316L material; and the valve seat is made of engineering plastic.

[0015] This utility model discloses a hydraulic cylinder, which has the following beneficial effects:

[0016] This invention provides a valve seat with an installation groove inside, where the first sealing ring is installed. The valve core is in sealing contact with both the first sealing ring and the valve seat, achieving a two-stage seal and thus ensuring reliable sealing over a wide pressure range of 0.5 to 70 MPa.

[0017] The valve body of this utility model is provided with a first stepped surface. The end cap is sealed to the first stepped surface by a boss. The end cap is connected to the valve cover by the boss. The end cap is connected to the valve seat by the boss. The boss seal replaces the traditional sealing ring seal, avoiding phenomena such as sealing ring aging, hydrogen explosion, and hydrogen permeation that are prone to occur after long-term use.

[0018] The filter includes a filter support and a filter screen. The filter screen is disposed on the support, and the filter screen and the filter support form the fourth cavity. The filter screen is a three-layer sintered stainless steel filter screen structure, with the mesh openings of each layer of wire mesh interlaced. The filter screen has multiple mesh openings for hydrogen to pass through. The filter screen has a uniform filtration structure, which effectively increases the gas flow area, reduces flow resistance, and thus improves hydrogenation efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a hydrogenation port structure according to this utility model;

[0021] Figure 2 This is a schematic diagram of a guide sleeve with a hydrogenation port structure.

[0022] Figure 3 This is a schematic diagram of a boss seal in a hydrogenation port structure.

[0023] Figure label:

[0024] 100. Valve body; 101. First gas passage; 102. Hydrogen inlet; 200. Filter; 201. Filter screen support; 202. Filter screen; 203. Mesh; 300. Valve cover; 301. Hydrogen outlet; 400. End cap; 401. Gas passage hole; 500. Valve seat; 601. First sealing ring; 602. Second sealing ring; 603. Third sealing ring; 604. Retaining ring; 700. Valve core; 800. Guide sleeve; 801. Second gas passage; 802. Through hole; 900. Spring; 1000. Compression nut. Detailed Implementation

[0025] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0026] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0027] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0028] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0029] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0030] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0031] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0034] In the description of this utility model, "multiple" means two or more.

[0035] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0036] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

[0039] like Figure 1 As shown, this embodiment provides a hydrogen refueling port structure, which is a core component of the vehicle-mounted hydrogen storage system. It is used to connect with the hydrogen refueling gun to refuel the vehicle-mounted hydrogen storage cylinder. The hydrogen refueling port structure can be used in high-pressure vehicle-mounted hydrogen storage systems, especially 70MPa vehicle-mounted hydrogen storage systems.

[0040] Specifically, in this embodiment, the hydrogen filling port structure includes a valve body 100 and a valve cover 300. One end of the valve body 100 is provided with a hydrogen filling port 102, which is used to connect to the hydrogen filling gun to achieve hydrogen filling. The other end of the valve body 100 is connected to the valve cover 300. The valve body 100 has a first cavity inside, and an end cap 400 is disposed inside the first cavity. A filter 200 is connected to the side of the end cap 400 near the hydrogen filling port 102. The filter 200 is used to prevent foreign matter from entering the downstream valve and the fuel-electric system. The valve cover 300 is disposed on the side of the end cap 400 away from the hydrogen filling port 102. The valve cover 300 contacts and presses against the end cap 400. A second cavity is provided inside the valve cover 300, and a guide sleeve 800 is disposed inside the second cavity. A third cavity is provided inside the guide sleeve 800. The body contains a spring 900 connected to the third cavity, on which a valve core 700 is sleeved. The valve core 700 is slidably connected to the inner wall of the guide sleeve 800. The end of the valve core 700 near the end cap 400 contacts the first sealing ring 601 and the valve seat 500. The valve seat 500 has an internal mounting groove, in which the first sealing ring 601 is located. The valve core 700 and the first sealing ring 601, and the valve core 700 and the valve seat 500 form a two-stage seal, which is reliable. Under low-pressure conditions, the valve core 700 compresses the first sealing ring 601 under the spring force of the spring 900 and the pressure difference force on both sides of the valve core 700. Under high-pressure conditions, the end face of the valve core 700 and the valve seat 500 are in conical contact with the first sealing ring 601, achieving a seal and meeting the requirements for 70MPa high-pressure hydrogen refueling. Specifically, the valve core 700 has a first sealing part at one end near the end cover 400, and the valve seat 500 has a second sealing part that contacts the first sealing part. The shape of the second sealing part is adapted to the first sealing part. Preferably, the first sealing part is a spherical structure or a conical structure, which provides better sealing performance.

[0041] Specifically, such as Figure 3 As shown, in this embodiment, the valve body 100 is provided with a first stepped surface 103. The end cap 400 is sealed to the first stepped surface 103 via a boss 401. The end cap 400 is connected to the valve cover 300 via the boss 401, and the end cap 400 is connected to the valve seat 500 via the boss 401. This embodiment uses a boss seal instead of a traditional sealing ring seal, avoiding phenomena such as sealing ring aging, hydrogen explosion, and hydrogen permeation that easily occur after long-term use. Preferably, the cross-section of the boss 401 is V-shaped, which can play a sealing role. Optionally, the boss 401 is provided on the end cap 400 and the valve seat 500, and the valve cover 300 and the end cap 400 are provided with notches that match the boss 401.

[0042] To allow hydrogen to be injected into the vehicle-mounted hydrogen storage cylinder from the hydrogen filling port 102, the end of the valve cover 300 away from the valve body 100 is provided with a hydrogen outlet 301, which is connected to the vehicle-mounted hydrogen storage cylinder. A first gas channel 101 for gas flow is formed between the filter 200 and the inner wall of the first cavity, such as... Figure 2 As shown, the outer side of the guide sleeve 800 is provided with a second gas channel 801. Hydrogen gas in the hydrogen refueling gun passes sequentially through the first gas channel 101, the fourth cavity in the filter 200, and the gas passage 401 in the end cap 400. High-pressure gas pushes the valve core 700 to move away from the valve seat 500, and the hydrogen gas enters the second gas channel 801, then enters the hydrogen outlet 301, and finally enters the on-board hydrogen storage tank. Specifically, the guide sleeve 800 is provided with a through hole 802, through which hydrogen gas enters the second gas channel 801 and then enters the hydrogen outlet 301.

[0043] More specifically, in order to effectively increase the gas flow area, reduce flow resistance, and improve hydrogenation efficiency, the filter 200 includes a filter support 201 and a filter 202. The filter 202 is disposed on the support 201, and the filter 202 and the filter support 201 form the fourth cavity. The filter 202 is a three-layer sintered stainless steel filter structure, with the mesh openings of each layer of wire mesh interlaced. The filter 202 is provided with multiple mesh openings 203 for hydrogen to pass through, and the filter 202 has a uniform filtration structure.

[0044] The valve body 100 is made of austenitic stainless steel 316L, which has high strength and good resistance to hydrogen embrittlement. The hydrogen inlet 102 is compatible with a 70MPa hydrogenation gun. The valve body 100 is threadedly connected to the valve cover 300. The valve core 700 is made of 316L material, and the sealing part is preferably a spherical structure with good self-adaptability. The valve seat 500 is made of engineering plastic (PPEK, PI, PAI, etc.), and the first sealing ring 601 is made of rubber.

[0045] A second sealing ring 602, a third sealing ring 603, and a retaining ring 604 are sequentially provided at the hydrogen filling port 102 from the end of the valve body 100 towards the valve cover 300. The retaining ring 604 is used to limit the hydrogen filling gun, and the second sealing ring 602 and the third sealing ring 603 are used to seal between the hydrogen filling port 102 and the hydrogen filling gun. The outer wall of the valve body 100 is provided with external threads, which are connected to the clamping nut 1000.

[0046] The working principle of the hydrogenation port structure provided in this embodiment is as follows:

[0047] During refueling, the hydrogen refueling gun is connected to the hydrogen refueling port 102. High-pressure hydrogen overcomes the spring force of the spring 900 and the pressure inside the hydrogen cylinder, causing the valve core 700 to move away from the end cap 400, opening in one direction. The high-pressure hydrogen sequentially passes through the first gas channel 101, the filter screen 202, the vent hole 401 of the end cap 400, and the second gas channel 801 before entering the rear pipeline connected to the hydrogen outlet 301 and the hydrogen cylinder. When refueling stops, the hydrogen refueling gun is disconnected from the hydrogen refueling port 102. Under the action of the spring force of the spring 900 and the pressure difference force on both sides of the valve core 700, the valve core 700 moves towards the valve seat 500, closing the valve core 700 and the valve seat 500, achieving a reliable seal.

[0048] This utility model provides a valve seat 500 with an installation groove inside, where the first sealing ring is installed. The valve core 700 is in sealing contact with both the first sealing ring 601 and the valve seat 500, achieving a two-stage seal and thus ensuring sealing reliability over a wide pressure range of 0.5 to 70 MPa.

[0049] In this invention, the valve body 100 is provided with a first stepped surface 103. The end cap 400 is sealed to the first stepped surface 103 by a boss 401. The end cap 400 is connected to the valve cover 300 by the boss 401. The end cap 400 is connected to the valve seat 500 by the boss 401. The boss seal replaces the traditional sealing ring seal, avoiding phenomena such as sealing ring aging, hydrogen explosion, and hydrogen permeation that are prone to occur after long-term use.

[0050] The filter 200 includes a filter support 201 and a filter 202. The filter 202 is disposed on the support 201. The filter 202 and the filter support 201 form the fourth cavity. The filter 202 is a three-layer sintered stainless steel filter structure with interlaced mesh openings in each layer. The filter 202 has multiple mesh openings 203 for hydrogen to pass through. The filter 202 has a uniform filtration structure, which effectively increases the gas flow area and reduces flow resistance, thereby improving hydrogenation efficiency.

[0051] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A hydrogenation port structure, characterized in that, The valve includes a valve body, a valve cover, a valve seat, and a valve core assembly. One end of the valve body has a hydrogen inlet, and the other end is connected to the valve cover. The valve cover has a hydrogen outlet at the end away from the valve body. The valve seat and the valve core assembly are coaxially disposed within the valve cover. The valve core assembly includes a valve core, which is movably connected to the valve seat. The valve seat has a valve port that mates with the valve core. The valve port has a first sealing part, and one end of the valve core has a second sealing part that mates with the first sealing part. A first sealing ring is also connected between the valve core and the valve seat.

2. The hydrogenation port structure according to claim 1, characterized in that, The valve body has a first cavity inside, and an end cap is provided inside the first cavity. The first cavity has a first stepped surface, and the first stepped surface is connected to the end cap by a boss.

3. The hydrogenation port structure according to claim 2, characterized in that, The end cap and the valve cover are connected by a boss.

4. The hydrogenation port structure according to claim 2, characterized in that, The end cap and the valve seat are connected by a boss.

5. The hydrogenation port structure according to claim 2, characterized in that, A filter is connected to the side of the end cap near the hydrogen inlet. A first gas channel is formed between the filter and the inner wall of the valve body. The filter includes a filter support and a filter screen. The filter screen is installed on the filter support. The interior of the filter is in communication with the hydrogen outlet.

6. The hydrogenation port structure according to claim 1, characterized in that, The valve cover has a second cavity, in which the valve core assembly is disposed. The valve core assembly includes a guide sleeve, and a third cavity is disposed inside the guide sleeve. A spring is connected inside the third cavity, and the valve core is sleeved on the spring. The valve core is slidably connected to the guide sleeve.

7. The hydrogenation port structure according to claim 6, characterized in that, A second gas channel is provided on the outer side of the guide sleeve, and the hydrogen filling port, the second gas channel, and the hydrogen outlet are interconnected.

8. The hydrogenation port structure according to claim 7, characterized in that, The shape of the first sealing part is adapted to the shape of the second sealing part.

9. The hydrogenation port structure according to claim 8, characterized in that, The first sealing part has a spherical or conical structure.

10. The hydrogenation port structure according to claim 1, characterized in that, The valve body is made of austenitic stainless steel 316L; the valve core is made of 316L material; and the valve seat is made of engineering plastic.

Images