A sealing structure for high-pressure hydrogen storage container

Abstract

The present invention provides a sealing structure for a high-pressure hydrogen storage container, which relates to the technical field of high-pressure hydrogen storage containers. The structure includes a plastic liner, a valve seat core and a valve seat sleeve; the valve seat sleeve is sleeved on the valve seat core, and the valve seat sleeve is threadedly connected to the valve seat core, and an injection molding cavity is formed between the lower part of the valve seat sleeve and the lower part of the valve seat core; at least one exhaust hole is provided on the valve seat sleeve; at least one core body annular groove is provided on the outer peripheral wall of the lower part of the valve seat core; at least one sleeve annular groove is provided on the inner peripheral wall of the lower part of the valve seat sleeve; the core body annular groove and the sleeve annular groove are arranged in sequence along the axial direction; the core skirt of the lower part of the valve seat core is provided with multiple sections of inner circle through holes and outer circle through holes that penetrate the valve seat core at intervals along the circumferential direction. The advantage of the present invention is that a better sealing effect is formed between the lifting valve seat and the plastic liner, ensuring that the sealing of the hydrogen storage container is guaranteed during long-term use.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure hydrogen storage containers, and in particular to a sealing structure for a high-pressure hydrogen storage container. Background Art

[0002] Hydrogen energy has been a hot research area at home and abroad in recent years, and the research and development of plastic liner high-pressure hydrogen storage cylinders has attracted much attention in this field. High-pressure hydrogen storage containers generally have the following structures: plastic liner, usually modified high-density polyethylene, nylon, etc.; metal bottle valve seat, generally placed at the mouth of the plastic liner, used to connect the bottle mouth high-pressure combination valve or other external connectors, usually aluminum alloy or high-nickel stainless steel and other metal materials; fiber composite material, usually carbon fiber composite material, is formed on the surface of the plastic liner by wet or dry winding to form a high-pressure composite material layer.

[0003] The development of plastic liner hydrogen storage cylinders with a nominal pressure of 70MPa in China is relatively slow. One of the key issues that need to be solved is the sealing of the bottle mouth of the cylinder. The structural form of the metal bottle valve seat determines the sealing form and molding method of the bottle mouth of the hydrogen storage cylinder. The valve seat structure of the existing plastic liner high-pressure hydrogen storage cylinder usually adopts a sealing solution of direct extrusion of the rubber sealing ring and the plastic liner. Due to the creep characteristics of plastic, the reliability of this sealing structure in long-term use is usually not guaranteed. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the sealing performance of the existing hydrogen cylinder sealing structure cannot be well guaranteed during long-term use. In order to overcome the defects of the above-mentioned prior art, the present invention provides an annular groove arranged on the valve seat core and the valve seat sleeve, as well as an outer ring through hole and an inner ring through hole arranged on the valve seat core, so that the plastic inner liner can be cooled and contracted to better press the upper end face of the core skirt, thereby forming a better sealing effect between the valve seat and the inner liner, ensuring that the sealing performance of the hydrogen storage container is guaranteed during long-term use.

[0005] For the purpose of the present invention, the following technical solutions are adopted to achieve the goal:

[0006] A sealing structure for a high-pressure hydrogen storage container, comprising a plastic liner, a valve seat core and a valve seat sleeve; the valve seat sleeve is sleeved on the valve seat core, and the upper part of the valve seat sleeve is threadedly connected to the upper part of the valve seat core, an injection molding cavity for molding the bottle mouth of the plastic liner is formed between the lower part of the valve seat sleeve and the lower part of the valve seat core, and a sealing structure is formed between the plastic liner, the valve seat core and the valve seat sleeve; at least one exhaust hole connected to the injection molding cavity is provided on the valve seat sleeve; the lower part of the valve seat core is threadedly connected to the upper part of the valve seat sleeve, and the lower part of the valve seat core is threadedly connected to the upper part of the valve seat sleeve. At least one core annular groove is arranged on the outer peripheral wall of the valve seat sleeve; at least one sleeve annular groove is arranged on the inner peripheral wall of the lower part of the valve seat sleeve; the core annular groove and the sleeve annular groove are arranged in a staggered manner along the axial direction; the valve seat core includes an upper valve seat column and a lower core skirt; the core skirt is provided with multiple sections of inner ring through holes that penetrate the valve seat core at intervals along the circumferential direction; the core skirt at the bottom of the valve seat core is provided with multiple sections of outer ring through holes that penetrate the valve seat core at intervals along the circumferential direction. The core annular grooves and sleeve annular grooves arranged in a staggered manner along the axial direction can further improve the sealing effect during the injection molding process, so that the two fit closely, and the inner ring through holes and the outer ring through holes are arranged in sections. When the plastic liner is cooled during injection molding, the plastic liner cools and shrinks to better compress the upper end face of the core skirt, forming a better sealing effect, and finally improving the valve seat and the plastic liner to form a better sealing effect, ensuring the sealing of the hydrogen storage container during long-term use.

[0007] Preferably, the inner ring through hole comprises a first inner ring channel, a second inner ring channel and a third inner ring channel which are connected in sequence from top to bottom; the cross-sectional width of the first inner ring channel is smaller than the cross-sectional width of the third inner ring channel, and the cross-sectional width of the second inner ring channel gradually increases from top to bottom. The inner ring through hole has a self-tightening sealing effect, and the cross-sectional shape of the through hole is narrow at the upper end, wide at the lower end, and the middle part is a conical transition. When subjected to internal pressure load, the plastic liner further squeezes the conical surface of the through hole to obtain a better sealing effect.

[0008] Preferably, the outer ring through hole comprises a first outer ring channel, a second outer ring channel and a third outer ring channel which are connected in sequence from top to bottom; the cross-sectional width of the first outer ring channel is smaller than the cross-sectional width of the third outer ring channel, and the cross-sectional width of the second outer ring channel gradually increases from top to bottom. The outer ring through hole has a self-tightening sealing effect, and the cross-sectional shape of the through hole is narrow at the upper end, wide at the lower end, and the middle part is a conical transition. When subjected to internal pressure load, the plastic liner further squeezes the conical surface of the through hole to obtain a better sealing effect.

[0009] Preferably, the lower end surface of the core skirt of the valve seat core is provided with a slope, the slope is inclined from outside to inside and from top to bottom, and the slope angle is 8° to 15°. The axial bearing capacity of the core skirt can be enhanced by the slope design.

[0010] Preferably, the valve seat sleeve comprises an upper sleeve cylinder and a lower sleeve skirt; the edge of the sleeve skirt is provided with a step. The step design prevents the valve seat sleeve and the plastic liner from sliding relative to each other in the axial direction, further improving the overall sealing performance.

[0011] Preferably, there are multiple exhaust holes, and the multiple exhaust holes are arranged at equal intervals along the axis of the plastic liner. The multiple exhaust holes further facilitate the exhaust of gas inside the injection molding cavity during the injection molding process.

[0012] Preferably, the outer ring through holes of the valve seat core are evenly arranged in four sections along the axis of the plastic liner in a circumferential direction, and the circumferential angle of the outer ring through holes along the axis of the plastic liner in each section is 60°. The above circumferential arrangement can better achieve that the plastic melt fills the outer and inner ring through holes, and the upper and lower surfaces of the plastic shrink toward the middle position during the cooling stage of the plastic melt, thereby increasing the covering force of the interface between the plastic liner and the metal bottle valve seat.

[0013] Preferably, the inner ring through holes of the valve seat core are evenly arranged in four sections along the axis of the plastic liner in a circumferential direction, and the circumferential angle of the inner ring through holes in each section along the axis of the plastic liner is 60°. The above circumferential arrangement can better achieve that the plastic melt fills the outer and inner ring through holes, and the upper and lower surfaces of the plastic shrink toward the middle position during the cooling stage of the plastic melt, thereby increasing the covering force of the interface between the plastic liner and the metal bottle valve seat.

[0014] Preferably, the two ends of the outer ring through hole are not penetrated, the middle of the outer ring through hole is penetrated, and the two ends of the outer ring through hole are connected to the middle through an inclined transition; the two ends of the inner ring through hole are not penetrated, the middle of the inner ring through hole is penetrated, and the two ends of the inner ring through hole are connected to the middle through an inclined transition. The inclined transition facilitates better inflow, improves the fluidity and smoothness of the liquid during the injection molding process, and further improves the injection molding efficiency and injection molding effect.

[0015] Preferably, an offset angle is provided between the adjacent outer ring through holes and the inner ring through holes along the circumferential direction of the plastic liner axis, and the offset angle is 30° to 60°. The offset angle is preferably 45°, and the spacing between the outer ring through holes and the inner ring through holes is to improve the strength of the valve seat core, thereby further ensuring the sealing performance for long-term use.

[0016] To sum up, the advantage of the present invention is that the core annular grooves and sleeve annular grooves arranged in sequence along the axial direction can make the two fit closely, ensuring that the metal bottle valve seat assembly and the plastic liner do not slide relative to each other in the axial direction, and further improving the sealing effect during the injection molding process; the inner ring through holes and outer ring through holes set by the internal core are of segmented design, and when the plastic liner is cooled during injection molding, the plastic liner cools and shrinks to better compress the upper end face of the core skirt to form a better sealing effect; the inner ring through holes and outer ring through holes of the internal core of the metal bottle valve seat have a self-tightening sealing effect, and the cross-sectional shape of the through holes is narrow at the upper end and wide at the lower end, and the middle part is a conical transition. When subjected to internal pressure load, the plastic liner further squeezes the conical surface of the through hole to obtain a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a first cross-sectional schematic diagram of the sealing structure for the high-pressure hydrogen storage cylinder of the present invention;

[0018] Figure 2 is a second cross-sectional schematic diagram of the sealing structure for the high-pressure hydrogen storage cylinder of the present invention;

[0019] Figure 3 It is a bottom view schematic diagram of the plastic liner and metal bottle valve seat assembly of the present invention;

[0020] Figure 4 It is a schematic diagram of the injection mold of the plastic liner injection molded part of the present invention.

[0021] Description of reference numerals:

[0022] 01. Plastic liner; 02. Valve seat core; 0200. Core skirt; 0201. External thread; 0202. Core annular groove; 0203. Outer ring through hole; 02031. First outer ring channel; 02032. Second outer ring channel; 02033. Third outer ring channel; 0204. Inner ring through hole; 02041. First inner ring channel; 02042. Second inner ring channel; 02043. Third inner ring channel; 0205. Slope; 03. Valve seat sleeve; 0300. Sleeve skirt; 0301. Internal thread; 0302. Vent hole; 0303. Sleeve annular groove; 0304. Step; 04. Fiber composite layer; 05. Injection cavity; 06. Injection mold upper mold; 0601. Runner; 0602. Gate; 07. Ejector pin; 08. Injection mold lower mold. DETAILED DESCRIPTION

[0023] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0024] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 4As shown, a sealing structure for a high-pressure hydrogen storage container includes a plastic liner 01, a valve seat core 02, a valve seat sleeve 03 and a fiber composite layer 04; a penetrating valve core channel is provided in the middle of the valve seat core 02; the valve seat sleeve 03 is sleeved on the valve seat core 02, and the internal thread 0301 of the upper part of the valve seat sleeve 03 is threadedly connected with the external thread 0201 of the upper part of the valve seat core 02, an injection molding cavity 05 for molding the bottle mouth of the plastic liner 01 is formed between the lower part of the valve seat sleeve 03 and the lower part of the valve seat core 02, and a sealing structure is formed between the plastic liner 01, the valve seat core 02 and the valve seat sleeve 03; the fiber composite layer 04 is wrapped around the outside of the bottle body of the plastic liner 01. The valve seat core 02 and the valve seat sleeve 03 are combined by threaded connection to form a metal bottle valve seat assembly; the valve seat sleeve 03 is provided with at least one exhaust hole 0302 connected to the injection cavity 05, and the exhaust hole 0302 is located at the upper end of the injection cavity 05; there are four exhaust holes 0302, and the four exhaust holes 0302 are arranged circumferentially and evenly spaced along the axis of the plastic liner 01. Through multiple exhaust holes 0302, it is further convenient to discharge the internal gas of the injection cavity 05 during the injection molding process. Two core annular grooves 0202 are provided on the outer peripheral wall of the lower part of the valve seat core 02; two sleeve annular grooves 0303 are provided on the inner peripheral wall of the lower part of the valve seat sleeve 03; the core annular groove 0202 and the sleeve annular groove 0303 are arranged in sequence along the axial direction, that is, the core annular groove 0202 is inserted between the upper and lower two adjacent sleeve annular grooves 0303, and the sleeve annular groove 0303 is inserted between the upper and lower two adjacent core annular grooves 0202. The valve seat core 02 includes an upper valve seat cylinder and a lower core skirt 0200; the core skirt 0200 at the lower part of the valve seat core 02 is provided with multiple sections of inner ring through holes 0204 that penetrate the valve seat core 02 at intervals along the circumferential direction; the core skirt 0200 at the bottom of the valve seat core 02 is provided with multiple sections of outer ring through holes 0203 that penetrate the valve seat core 02 at intervals along the circumferential direction, and the outer ring through holes 0203 and the inner ring through holes 0204 have the same cross-sectional shape, and the overall structure of the outer ring through holes 0203 and the inner ring through holes 0204 is distributed in mirror symmetry. The core annular grooves 0202 and the sleeve annular grooves 0303 that are arranged in sequence along the axial direction can make the two fit closely, ensuring that the metal bottle valve seat assembly and the plastic liner 01 do not slide relative to each other in the axial direction, further improving the sealing effect during the injection molding process. In addition, the inner ring through hole 0204 and the outer ring through hole 0203 are arranged in sections. When the plastic liner 01 is cooled after injection molding, the plastic liner 01 cools and shrinks, thereby better pressing the upper end surface of the core skirt 0200 to form a better sealing effect, and finally a better sealing effect is formed between the lift valve seat and the plastic liner 01, ensuring the sealing of the hydrogen storage container during long-term use.

[0028] like Figures 1 to 4As shown, the inner circle through hole 0204 includes a first inner circle channel 02041, a second inner circle channel 02042 and a third inner circle channel 02043 which are connected in sequence from top to bottom; the cross-sectional width of the first inner circle channel 02041 is smaller than the cross-sectional width of the third inner circle channel 02043, and the cross-sectional width of the second inner circle channel 02042 gradually increases from top to bottom. The inner circle through hole 0204 is configured as a first inner circle channel 02041 of a vertical section near the end face of the bottle mouth of the plastic liner 01, and the inner circle through hole 0204 is configured as a third inner circle channel 02043 of a vertical section away from the end face of the bottle mouth of the plastic liner 01, and the first inner circle channel 02041 and the third inner circle channel 02043 are transitioned through a conical expansion shape; that is, the cross-sectional shape of the inner circle through hole 0204 is vertical-conical expansion-vertical from the end face close to the bottle mouth to the end face away from the bottle mouth. The inner ring through hole 0204 has a self-tightening sealing effect. The cross-sectional shape of the through hole is narrow at the upper end, wide at the lower end, and has a conical transition in the middle. When subjected to internal pressure load, the plastic liner 01 further squeezes the conical surface of the through hole to obtain a better sealing effect.

[0029] like Figures 1 to 4 As shown, the outer ring through hole 0203 includes a first outer ring channel 02031, a second outer ring channel 02032 and a third outer ring channel 02033 which are sequentially connected from top to bottom; the cross-sectional width of the first outer ring channel 02031 is smaller than the cross-sectional width of the third outer ring channel 02033, and the cross-sectional width of the second outer ring channel 02032 gradually increases from top to bottom. The outer ring through hole 0203 is configured as a vertical section of the first outer ring channel 02031 near the end face of the bottle mouth of the plastic liner 01, and the outer ring through hole 0203 is configured as a vertical section of the third outer ring channel 02033 away from the end face of the bottle mouth of the plastic liner 01, and the first outer ring channel 02031 and the third outer ring channel 02033 are transitioned through a conical expansion shape; that is, the cross-sectional shape of the outer ring through hole 0203 is vertical-conical expansion-vertical shape from the end face close to the bottle mouth to the end face away from the bottle mouth. The outer ring through hole 0203 has a self-tightening sealing effect. The cross-sectional shape of the through hole is narrow at the upper end, wide at the lower end, and has a conical transition in the middle. When subjected to internal pressure load, the plastic liner 01 further squeezes the conical surface of the through hole to obtain a better sealing effect.

[0030] like Figure 1 to Figure 2As shown, the lower end surface of the core skirt 0200 on the valve seat core 02 is provided with a slope 0205, and the thickness of the core skirt 0200 gradually increases from away from the axis of the plastic liner 01 to close to the axis of the plastic liner 01 (i.e., from outside to inside and from top to bottom), and the inclination angle of the slope 0205 is 8° to 15°. The design of the slope 0205 can enhance the axial bearing capacity of the core skirt 0200. The valve seat sleeve 03 includes an upper sleeve cylinder and a lower sleeve skirt 0300, and the edge of the sleeve skirt 0300 is provided with a step 0304. The design of the step 0304 prevents the valve seat sleeve 03 and the plastic liner 01 from sliding relative to each other in the axial direction, further improving the overall sealing performance.

[0031] like Figure 3 As shown, the outer ring through holes 0203 of the valve seat core 02 are evenly arranged in four sections along the axis of the plastic liner 01, and the circumferential angle of each section of the outer ring through holes 0203 along the axis of the plastic liner 01 is 60°. The inner ring through holes 0204 of the valve seat core 02 are evenly arranged in four sections along the axis of the plastic liner 01, and the circumferential angle of each section of the inner ring through holes 0204 along the axis of the plastic liner 01 is 60°. The outer ring through holes 0203 and the inner ring through holes 0204 are arranged circumferentially in order to better fill the outer ring through holes 0203 and the inner ring through holes 0204 with the plastic melt, and the upper and lower surfaces of the plastic shrink toward the middle position during the cooling stage of the plastic melt, thereby increasing the covering force of the interface between the plastic liner and the metal bottle valve seat. An offset angle is provided between the adjacent outer ring through holes 0203 and the inner ring through holes 0204 along the circumferential direction of the axis of the plastic liner 01, and the offset angle is 30° to 60°. The offset angle is preferably 45°, and the spacing between the outer ring through holes and the inner ring through holes is to improve the strength of the valve seat inner core (compared to the case where the offset angle is 0), thereby further ensuring the sealing performance for long-term use. The two ends of the outer ring through hole 0203 are not penetrated, the middle part of the outer ring through hole 0203 is penetrated, and the two ends of the outer ring through hole 0203 are connected to the middle part through an inclined transition; the two ends of the inner ring through hole 0204 are not penetrated, the middle part of the inner ring through hole 0204 is penetrated, and the two ends of the inner ring through hole 0204 are connected to the middle part through an inclined transition. The inclined transition facilitates better inflow, improves the fluidity and smoothness of the liquid during the injection molding process, and further improves the injection molding efficiency and injection molding effect.

[0032] The structure of the injection mold in the present invention is as follows Figure 4As shown, it includes a mold cavity, an injection mold upper mold 06, a push rod 07, and an injection mold lower mold 08. The mold cavity is formed by the metal bottle valve seat assembly, the injection mold upper mold 06, and the injection mold lower mold 08, which is the structure of the plastic liner 01; the injection mold upper mold 06 is provided with a flow channel 0601 and a gate 0602, the gate 0602 is arranged on the inner ring through hole 0204 of the valve seat core 02, the number of gates 0602 is set to four, and the gates 0602 are evenly distributed in the axial ring direction of the plastic liner 01, and the gate 0602 is located in the middle position of each section of the inner ring through hole 0204, so that the injection molding quality of the plastic liner 01 is stable and the manufacturing efficiency is high; the ejector pin 07 is arranged on the injection mold lower mold 08, and can move independently. When the injection mold is closed, the ejector pin 07 is retracted and participates in injection molding. After the cooling of the plastic liner 01 is completed, the injection mold is opened, and the ejector pin 07 is pushed out to eject the combination of the plastic liner 01 and the metal bottle valve seat out of the injection mold lower mold 08.

[0033] A method for forming a sealing structure for a high-pressure hydrogen storage container, using the sealing structure for a high-pressure hydrogen storage container, comprises the following five steps in sequence:

[0034] S1. Pretreatment: The valve seat core 02 and the valve seat sleeve 03 are connected and assembled by threaded connection to form a metal bottle valve seat assembly, and the metal bottle valve seat assembly is preheated to 80°C;

[0035] S2. Installation: The preheated metal bottle valve seat assembly is installed as an insert in the upper mold 06 of the injection mold. The upper mold 06 of the injection mold is provided with a flow channel 0601 and a gate 0602. The gate 0602 is located on the inner circle through hole 0204 on the lower surface of the valve seat core 02. The number of gates 0602 is set to four, and the gate 0602 is located in the middle of each section of the inner circle through hole 0204.

[0036] S3, mold closing: the injection mold upper mold 06 and the injection mold lower mold 08 are molded together, and the injection mold upper mold 06, the injection mold lower mold 08 and the metal bottle valve seat assembly form a connected mold cavity, and this mold cavity is used for injection molding of the plastic liner 01;

[0037] S4, injection molding: The extruder fills the molten plastic into the injection mold cavity, and after filling, pressure holding and cooling, a combination of the metal bottle valve seat and the plastic liner 01 is formed;

[0038] S5, completion: the ejector pin 07 on the lower mold 08 of the injection mold is pushed out, the plastic liner 01 and the metal bottle valve seat assembly are ejected and demolded, and then the ejector pin 07 is retracted to prepare for the next injection molding production.

[0039] To sum up, the advantages of the present invention are that the inner ring through holes and the outer ring through holes set by the internal core are of segmented design. When the plastic liner is cooled during injection molding, the plastic liner cools and shrinks to better compress the upper end face of the core skirt to form a better sealing effect; the inner ring through holes and the outer ring through holes of the internal core of the metal bottle valve seat have a self-tightening sealing effect, and the cross-sectional shape of the through holes is narrow at the upper end and wide at the lower end, and the middle part is a conical transition. When subjected to internal pressure load, the plastic liner further squeezes the conical surface of the through hole to obtain a better sealing effect; in the injection molding method of the plastic liner, the gate position of the injection mold is set at the inner ring through hole of the valve core, which reduces the injection filling resistance, and the molten liner material can more easily fill the cavity to obtain better injection molding quality.

[0040] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A sealing structure for a high-pressure hydrogen storage container, characterized in that: The invention comprises a plastic liner (01), a valve seat core (02) and a valve seat sleeve (03); the valve seat sleeve (03) is sleeved on the valve seat core (02), and the upper part of the valve seat sleeve (03) is threadedly connected to the upper part of the valve seat core (02); an injection molding cavity (05) for molding the bottle mouth of the plastic liner (01) is formed between the lower part of the valve seat sleeve (03) and the lower part of the valve seat core (02), and a sealing structure is formed between the plastic liner (01), the valve seat core (02) and the valve seat sleeve (03); at least one exhaust hole (0302) connected to the injection molding cavity (05) is provided on the valve seat sleeve (03); a gas outlet (0302) is provided on the outer peripheral wall of the lower part of the valve seat core (02); There is at least one core annular groove (0202); at least one sleeve annular groove (0303) is arranged on the inner peripheral wall of the lower part of the valve seat sleeve (03); the core annular groove (0202) and the sleeve annular groove (0303) are arranged in sequence along the axial direction; the valve seat core (02) includes an upper valve seat column and a lower core skirt (0200); the core skirt (0200) is provided with a plurality of inner ring through holes (0204) penetrating the valve seat core (02) at intervals along the circumferential direction; the core skirt (0200) at the bottom of the valve seat core (02) is provided with a plurality of outer ring through holes (0203) penetrating the valve seat core (02) at intervals along the circumferential direction; The outer ring through holes (0203) of the valve seat core (02) are evenly arranged in four sections along the axis of the plastic inner liner (01) in a circumferential direction, and the circumferential angle of the outer ring through holes (0203) in each section along the axis of the plastic inner liner (01) is 60°; the inner ring through holes (0204) of the valve seat core (02) are evenly arranged in four sections along the axis of the plastic inner liner (01) in a circumferential direction, and the circumferential angle of the inner ring through holes (0204) in each section along the axis of the plastic inner liner (01) is 60°. The circumferential angle of the axis of the gallbladder (01) is 60°; the two ends of the outer ring through hole (0203) are not penetrated, the middle part of the outer ring through hole (0203) is penetrated, and the two ends of the outer ring through hole (0203) are connected to the middle part through an inclined transition; the two ends of the inner ring through hole (0204) are not penetrated, the middle part of the inner ring through hole (0204) is penetrated, and the two ends of the inner ring through hole (0204) are connected to the middle part through an inclined transition.

2. The sealing structure for a high-pressure hydrogen storage container according to claim 1, characterized in that: The inner ring through hole (0204) comprises a first inner ring channel (02041), a second inner ring channel (02042) and a third inner ring channel (02043) which are connected in sequence from top to bottom; the cross-sectional width of the first inner ring channel (02041) is smaller than the cross-sectional width of the third inner ring channel (02043), and the cross-sectional width of the second inner ring channel (02042) gradually increases from top to bottom.

3. The sealing structure for a high-pressure hydrogen storage container according to claim 1 or 2, characterized in that: The outer ring through hole (0203) comprises a first outer ring channel (02031), a second outer ring channel (02032) and a third outer ring channel (02033) which are connected in sequence from top to bottom; the cross-sectional width of the first outer ring channel (02031) is smaller than the cross-sectional width of the third outer ring channel (02033), and the cross-sectional width of the second outer ring channel (02032) gradually increases from top to bottom.

4. The sealing structure for a high-pressure hydrogen storage container according to claim 1, characterized in that: The lower end surface of the core skirt (0200) of the valve seat core (02) is provided with a slope (0205), and the slope (0205) is inclined from outside to inside and from top to bottom, and the inclination angle of the slope (0205) is 8° to 15°.

5. The sealing structure for a high-pressure hydrogen storage container according to claim 1, characterized in that: The valve seat sleeve (03) comprises an upper sleeve cylinder and a lower sleeve skirt (0300); a step (0304) is provided on the edge of the sleeve skirt (0300).

6. The sealing structure for a high-pressure hydrogen storage container according to claim 1, characterized in that: There are a plurality of exhaust holes (0302), and the plurality of exhaust holes (0302) are arranged at equal intervals in a circumferential direction along the axis of the plastic liner (01).

7. The sealing structure for a high-pressure hydrogen storage container according to claim 1, characterized in that: An offset angle is provided between the adjacent outer ring through holes (0203) and the adjacent inner ring through holes (0204) along the circumferential direction of the axis of the plastic liner (01), and the offset angle is 30° to 60°.

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