Sealing structure, injection mold structure and molding method of plastic liner of high-pressure gas cylinder

Abstract

The present invention discloses a sealing structure, injection mold structure and molding method of a plastic liner of a high-pressure gas cylinder. The sealing structure of the plastic liner of the high-pressure gas cylinder includes a plastic liner, a connector and a fastener. The plastic liner has an opening structure and a gas storage cavity connected to the opening structure; the connector has a connecting portion, and the connector is suitable for connecting with the opening structure under the action of an external force, so as to connect the gas storage cavity with the outside through the connecting portion; the fastener is arranged in the opening structure, and when the connector is connected to the opening structure under the action of an external force, the inner wall surface of the fastener is suitable for abutting with the outer wall surface of the connector to fill the gap between the connector and the opening structure; the cross-sectional shapes of the opening structure and the fastener are both set to be circular, and the axis of the fastener is arranged colinearly with the axis of the opening structure, so that when the connector is connected to the opening structure, the fastener and the connector are abutted. The sealing structure of the plastic liner of the high-pressure gas cylinder with the above structure is conducive to improving the sealing performance of the plastic liner.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage cylinders, and in particular to a sealing structure, an injection mold structure and a molding method of a plastic liner of a high-pressure cylinder. Background Art

[0002] In recent years, hydrogen production and storage equipment has made great progress. High-pressure hydrogen storage cylinders generally use plastic materials as sealing structures, and several layers of carbon fiber materials are wrapped around their outer surface, making them not only strong but also lightweight. At the same time, the working pressure of high-pressure hydrogen storage cylinders reaches 70MPa.

[0003] In the prior art, high-pressure hydrogen storage cylinders need to be provided with connectors to connect with the outside for gas delivery. In order to meet the effective connection with the external valve, the end of the sealing structure needs to be designed with metal connectors to meet the structural integrity under loads such as high sealing preload force and axial tension. Therefore, for the sealing of the gas storage cylinder with a sealing structure, it is usually composed of a sandwich structure formed by a metal connector, a sealing structure and a metal insert ring reinforcement structure inside the sealing structure. The common insert ring injection molding is positioned by the flange on the outside of the insert ring and the inner circle of the mold. Due to the processing accuracy of the insert ring and the mold and the angle of placing the insert ring, the axis of the insert ring and the axis of the inner circle of the mold will be at a certain angle, which will cause the axis of the insert ring and the sealing surface to deviate, and the wall thickness of the effective sealing surface will be uneven. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that when the existing high-pressure hydrogen storage cylinder is connected to the plastic inner liner through a metal valve seat, the axial center of the embedded ring and the sealing surface deviates, and the wall thickness of the effective sealing surface is uneven, resulting in poor sealing performance of the high-pressure hydrogen storage cylinder.

[0005] To this end, the present invention provides a sealing structure for a plastic liner of a high-pressure gas cylinder, comprising:

[0006] The plastic liner has an opening structure and an air storage cavity which are connected to each other;

[0007] A connecting piece, the connecting piece having a connecting portion, and the connecting piece is suitable for connecting with the opening structure under the action of an external force, so as to connect the air storage cavity with the outside world through the connecting portion;

[0008] A fastener, wherein the fastener is disposed in the opening structure, and when the connecting member is connected to the opening structure under the action of an external force, the opening structure formed in the inner wall surface of the fastener is adapted to abut against the outer wall surface of the connecting member to fill the gap between the connecting member and the opening structure;

[0009] The cross-sectional shapes of the opening structure and the fastener are both set to be circular, and the axis of the fastener is set colinearly with the axis of the opening structure, so that when the connecting member is connected to the opening structure, the opening structure formed in the inner wall surface of the fastener is suitable for abutting against the outer wall surface of the connecting member.

[0010] Optionally, in the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, a plurality of connecting parts are opened on one side of the opening structure, the connecting parts are conformally matched with the fixed structure and suitable for connection with the fixed structure, and the fasteners are exposed in the connecting parts.

[0011] Optionally, in the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, the plastic liner also includes a fixing member arranged in the opening structure, and when the fastener is arranged in the opening structure, the fixing member is suitable for connecting with the fastener to fix the fastener.

[0012] Optionally, the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder is further provided with a mounting portion on the connecting piece; and also includes a sealing member, which is arranged in the mounting portion so that when the connecting piece abuts against the fastener under the action of an external force, the sealing member is suitable for sealing the gap between the connecting piece and the fastener.

[0013] Optionally, in the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, the plastic liner and the fastener are an integrally-molded structure by injection molding.

[0014] Optionally, in the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, the fastener is a metal insert ring, and the fastener is formed by stamping or wire cutting.

[0015] An injection mold structure, used for molding the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, comprises: a main body, a accommodating cavity with a molded opening structure, a plurality of fixing structures are arranged at intervals in the accommodating cavity, any of the fixing structures is suitable for connecting with a fastener to fix the fastener in the accommodating cavity, and when injection molding material is injected into the accommodating cavity under the action of external force, the injection molding material makes the fastener and the opening structure an injection-molded integral structure.

[0016] Optionally, in the above-mentioned injection mold structure, the fixing structure includes two fixing blocks arranged at an interval, and when the fastener is placed in the accommodating cavity, the fastener is suitable for being arranged in the interval so that the two fixing blocks fix the fastener.

[0017] Optionally, in the above-mentioned injection mold structure, the two fixed blocks in any of the fixed structures, the wall surfaces abutting against the fasteners are concentrically arranged with the outer wall section and the inner wall section of the opening structure, so that the fasteners are concentrically arranged with the outer wall surface and the inner wall surface of the opening structure, and the fasteners are abutted against the connecting piece connected to the opening structure.

[0018] Optionally, in the above-mentioned injection mold structure, a plurality of recessed portions are arranged at intervals in the accommodating cavity, and any of the recessed portions is arranged between two adjacent fixed structures, so that when the injection molding material is injected into the accommodating cavity under the action of external force, the injection molding material is formed into a fixing part in the recessed portion to fix the fastener.

[0019] A molding method, used for the above-mentioned injection mold structure, comprises the following steps:

[0020] Placing a fastener, and placing the fastener in the accommodating cavity under the action of an external force, and connecting the fastener with a fixed structure disposed in the accommodating cavity, so as to place the fastener in the accommodating cavity;

[0021] Injecting the injection molding material into the accommodating cavity under the action of an external force, so that the injection molding material flows into the accommodating cavity along the surrounding walls of the fastener and converges in a recessed portion provided in the accommodating cavity, so as to form a fixing member connected to the fastener in the recessed portion, and fix the fastener in the accommodating cavity;

[0022] The press-fit connector is pressed into the air storage cavity of the plastic liner through the opening structure under the action of external force, so that the connector abuts against the fastener, and the sealing member arranged on the connector seals the gap between the connector and the fastener.

[0023] The technical solution provided by the present invention has the following advantages:

[0024] 1. The sealing structure of the plastic liner of the high-pressure gas cylinder provided by the present invention comprises a plastic liner, a connecting piece and a fastener, wherein the plastic liner has an opening structure and a gas storage cavity which are arranged to communicate with each other; the connecting piece has a connecting portion, and the connecting piece is suitable for being connected to the opening structure under the action of an external force, so as to connect the gas storage cavity with the outside through the connecting portion; the fastener is arranged in the opening structure, and when the connecting piece is connected to the opening structure under the action of an external force, the opening structure formed in the inner wall surface of the fastener is suitable for abutting against the outer wall surface of the connecting piece, so as to fill the gap between the connecting piece and the opening structure; the cross-sectional shapes of the opening structure and the fastener are both set to be circular, and the axis of the fastener is arranged colinearly with the axis of the opening structure, so that when the connecting piece is connected to the opening structure, the opening structure formed in the inner wall surface of the fastener is suitable for abutting against the outer wall surface of the connecting piece.

[0025] The sealing structure of the plastic liner of the high-pressure gas cylinder of this structure is through a fastener arranged in the plastic liner and a connector connected to the plastic liner, wherein the plastic liner has a gas storage chamber capable of storing high-pressure gas and an opening structure connected to the gas storage chamber, that is, the gas storage chamber is connected to the outside through the opening structure, so that the high-pressure gas can flow into or out of the gas storage chamber through the opening structure, and the connector has a connecting portion, and the connecting portion can be connected to the opening structure under the action of an external force, thereby blocking the opening structure, and connecting the gas storage chamber and the outside through the connecting portion, so that the high-pressure gas can only flow into or out of the gas storage chamber through the connecting portion, and at the same time, the connecting portion can also be connected to an external device, so that the high-pressure gas stored in the gas storage chamber can flow into the external device through the connecting portion, and the fastener is arranged in the opening structure, and when the connecting portion is connected to the opening structure under the action of an external force, the outer wall surface of the connecting portion will be aligned with the inner wall surface of the fastener. The opening structure abuts, thereby filling the gap between the connecting piece and the opening structure, and then sealing the gap between the connecting piece and the opening structure, so that when the high-pressure gas in the gas storage chamber flows into or flows out of the gas storage chamber through the connecting part, the high-pressure gas will not leak from the gap between the connecting piece and the opening structure. In addition, the cross-sectional shapes of the opening structure and the fastener are both set to be circular, and when the fastener is installed in the opening structure, the axis of the fastener is arranged colinearly with the axis of the opening structure, so that the cross-sections of the inner and outer wall surfaces of the fastener are arranged concentrically with the cross-section of the inner wall surface of the opening structure, and then when the connecting piece is connected to the plastic liner under the action of external force, the connecting piece can abut against the opening structure formed on the inner wall surface of the fastener and achieve an interference fit, thereby sealing the gap between the opening structure and the connecting piece, and then after the connecting piece and the plastic liner are connected, the gas storage chamber can only be connected to the outside world through the connecting part, which is beneficial to improving the sealing performance of the plastic liner.

[0026] 2. The injection mold structure provided by the present invention is used to mold the sealing structure of the plastic liner of the above-mentioned high-pressure gas cylinder, including a main body, the main body has a accommodating cavity for molding an opening structure, and a plurality of fixed structures are arranged at intervals in the accommodating cavity. Any of the fixed structures is suitable for connecting with a fastener to fix the fastener in the accommodating cavity, and when the injection molding material is injected into the accommodating cavity under the action of an external force, the injection molding material makes the fastener and the opening structure an integrally molded structure.

[0027] The injection mold structure of this structure is provided with a receiving cavity having a molding opening structure in the main body and a plurality of fixed structures arranged in the receiving cavity at intervals. When the fastener is installed in the main body, the fastener needs to be placed in the receiving cavity and connected to all the fixed structures arranged in the receiving cavity, so that the fastener is fixed in the receiving cavity. Then, when the injection molding material is injected into the receiving cavity, the injection molding material can wrap the fastener, and when the injection molding material solidifies and forms a plastic liner in the receiving cavity, the fastener and the plastic liner will form an integral injection molding structure, so that there will be no gap between the fastener and the plastic liner, which is beneficial to improving the sealing performance of the plastic liner.

[0028] 3. The molding method provided by the present invention is used for the above-mentioned injection mold structure, including the steps of placing fasteners, injecting injection molding raw materials and pressing connecting parts. Placing fasteners is to place the fasteners in the accommodating cavity under the action of external force and connect them with the fixed structure arranged in the accommodating cavity to place the fasteners in the accommodating cavity; injecting injection molding raw materials is to inject the injection molding raw materials into the accommodating cavity under the action of external force, so that the injection molding raw materials flow into the accommodating cavity along the surrounding walls of the fastener and converge in the recessed portion arranged in the accommodating cavity to form a fixing part connected to the fastener in the recessed portion, and fix the fastener in the accommodating cavity; pressing connecting parts is to press the connecting parts into the air storage cavity of the plastic liner through the opening structure under the action of external force, so that the connecting parts abut against the fasteners, and the sealing parts arranged on the connecting parts seal the gap between the connecting parts and the fasteners.

[0029] The above-mentioned molding method, by sequentially performing the steps of placing the fastener, injecting the injection molding material and pressing the connecting piece, enables the fastener to be placed in the receiving cavity of the body under the action of an external force, and in this process, the fastener is connected to the fixed structure arranged in the receiving cavity, so that the fastener is fixed in the receiving cavity by the fixed structure, and then, the injection molding material is injected into the receiving cavity under the action of an external force, so that the injection molding material flows into the receiving cavity along the fastener and converges in the recessed portion arranged in the receiving cavity, so that the injection molding material is solidified in the receiving cavity to form a plastic liner At the same time, the injection molding material is formed into a fixing part in the recessed part and connected with the fastener, so that the fastener is fixed on the plastic liner. Finally, when the external force is reduced, the connecting part is pressed into the air storage cavity through the opening structure, and the outer wall surface of the connecting part and the inner wall surface of the fastener are abutted against each other, so that the sealing part on the connecting part fills the gap between the connecting part and the fastener to seal the gap between the connecting part and the fastener, and finally the plastic liner can only connect the air storage cavity and the outside world through the connecting part on the connecting part, which is beneficial to improve the sealing performance of the plastic liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is an overall plan view of the sealing structure of the plastic liner of the high-pressure gas cylinder provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the connection between the connector and the fastener at the opening structure of the sealing structure of the plastic liner of the high-pressure gas cylinder provided in an embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of an injection mold structure provided in an embodiment of the present invention;

[0034] Figure 4 A schematic structural diagram of a fixing structure of an injection mold structure provided in an embodiment of the present invention;

[0035] Description of reference numerals:

[0036] 1-Plastic liner; 11-Opening structure;

[0037] 2-connector; 3-fastener;

[0038] 4-main body; 5-fixed structure; 51-fixed block. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] This embodiment provides a sealing structure of a plastic liner of a high-pressure gas cylinder, such as Figure 1 and Figure 2 As shown, it includes a plastic liner 1, a connector 2 and a fastener 3, the plastic liner 1 has an opening structure 11 and an air storage chamber connected to the opening structure 11; the connector 2 has a connecting portion, and the connector 2 is suitable for connecting with the opening structure 11 under the action of an external force, so as to connect the air storage chamber with the outside through the connecting portion; the fastener 3 is arranged in the opening structure 11, and when the connector 2 is connected with the opening structure 11 under the action of an external force, the opening structure 11 formed in the inner wall surface of the fastener 3 is suitable for abutting with the outer wall surface of the connector 2 to fill the gap between the connector 2 and the opening structure 11; the cross-sectional shapes of the opening structure 11 and the fastener 3 are both set to be circular, and the axis of the fastener 3 is arranged colinearly with the axis of the opening structure 11, so that when the connector 2 is connected with the opening structure 11, the opening structure 11 formed in the inner wall surface of the fastener 3 is suitable for abutting with the outer wall surface of the connector 2.

[0045] The sealing structure of the plastic liner of the high-pressure gas cylinder of the above structure is provided by a fastener 3 arranged in the plastic liner 1 and a connector 2 connected to the plastic liner 1, wherein the plastic liner 1 has a gas storage chamber capable of storing high-pressure gas and an opening structure 11 connected to the gas storage chamber, that is, the gas storage chamber is connected to the outside through the opening structure 11, so that the high-pressure gas can flow into or out of the gas storage chamber through the opening structure 11, and the connector 2 has a connecting portion, and the connecting portion 2 can be connected to the opening structure 11 under the action of an external force, thereby blocking the opening structure 11, and connecting the gas storage chamber and the outside through the connecting portion, so that the high-pressure gas can only flow into or out of the gas storage chamber through the connecting portion, and at the same time, the connecting portion can also be connected to an external device, so that the high-pressure gas stored in the gas storage chamber can flow into the external device through the connecting portion, and the fastener 3 is arranged in the opening structure 11, and when the connecting portion 2 is connected to the opening structure 11 under the action of an external force, the outer wall surface of the connecting portion 2 will be connected to the opening structure 1 formed on the inner wall surface of the fastener 3. 1 is abutted, thereby filling the gap between the connector 2 and the opening structure 11, and then sealing the gap between the connector 2 and the opening structure 11, so that when the high-pressure gas in the gas storage cavity flows into or flows out of the gas storage cavity through the connecting portion, the high-pressure gas will not leak from the gap between the connector 2 and the opening structure 11. In addition, the cross-sectional shapes of the opening structure 11 and the fastener 3 are both set to be circular, and when the fastener 3 is installed in the opening structure 11, the axis of the fastener 3 is arranged in a colinear manner with the axis of the opening structure 11, so that the cross-sections of the inner and outer wall surfaces of the fastener 3 are arranged concentrically with the cross-section of the inner wall surface of the opening structure 11, and then when the connector 2 is connected to the plastic liner 1 under the action of external force, the connector 2 can abut against the opening structure 11 formed on the inner wall surface of the fastener 3 and achieve an interference fit, thereby sealing the gap between the opening structure 11 and the connector 2, and then after the connector 2 and the plastic liner 1 are connected, the gas storage cavity can only be connected to the outside through the connecting portion, which is beneficial to improving the sealing performance of the plastic liner 1.

[0046] The sealing structure of the plastic liner 1 of the high-pressure gas cylinder provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, a plurality of connection parts are provided on one side of the opening structure 11 . The connection parts are conformally matched with the fixing structure 5 and are suitable for connection with the fixing structure 5 . The fasteners 3 are exposed in the connection parts.

[0047] The sealing structure of the plastic liner 1 of the high-pressure gas cylinder of the above structure is achieved by a plurality of connecting parts opened on the opening structure 11. In the present embodiment, the connecting part is a connecting groove opened on one side of the opening structure 11. When the opening structure 11 is formed in the mold, the fastener 3 is engaged with the fixed structure 5 on the mold. Therefore, after the opening structure 11 is formed, the fixed structure 5 will form a connecting part on the opening structure 11, and when the opening structure 11 is taken out of the mold, the fastener 3 will be partially exposed in the connecting part. Therefore, when the opening structure 11 is formed, the connecting part can fix the fastener 3 in the mold, which is beneficial to the molding of the opening structure 11.

[0048] The sealing structure of the plastic liner of the high-pressure gas cylinder provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, the plastic liner 1 further comprises a fixing member disposed in the opening structure 11 . When the fastener 3 is disposed in the opening structure 11 , the fixing member is suitable for connecting with the fastener 3 to fix the fastener 3 .

[0049] The sealing structure of the plastic liner of the high-pressure gas cylinder of the above structure is provided with a fixing part in the opening structure 11. In the present embodiment, the fixing part is a fixing rib formed on the plastic liner 1. When the plastic liner 1 is injection molded, the fastener 3 can be placed in the mold first, and the injection molding material is injected into the mold so that the injection molding material is molded into the plastic liner 1 in the mold. Since the fastener 3 is placed in the mold, the part of the fixed part molded on the plastic liner 1 is in contact with the fastener 3 and connected to the fastener 3 after curing. Then, after the plastic liner 1 is molded, the fixing part fixes the fastener 3 at the opening structure 11.

[0050] The sealing structure of the plastic liner of the high-pressure gas cylinder provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, the connector 2 is also provided with a mounting portion; it also includes a sealing member, which is arranged in the mounting portion so that when the connector 2 abuts against the fastener 3 under the action of an external force, the sealing member is suitable for sealing the gap between the connector 2 and the fastener 3.

[0051] The sealing structure of the plastic liner of the high-pressure gas cylinder of the above structure is achieved by a mounting portion provided on the connecting member 2 and a sealing member arranged in the mounting portion. The mounting portion in this embodiment is a mounting groove provided on the connecting member 2, and the sealing member in this embodiment is a sealing ring. Therefore, when the connecting member 2 is connected to the plastic liner 1 under the action of an external force, the two opposite side surfaces of the sealing member can respectively abut against the outer wall surface of the connecting member 2 and the opening structure 11 formed on the inner wall surface of the fastener 3, thereby filling the gap between the connecting member 2 and the fastener 3, thereby enabling the sealing member to seal the gap between the connecting member 2 and the fastener 3, which is beneficial to further improve the sealing performance of the plastic liner 1.

[0052] The sealing structure of the plastic liner of the high-pressure gas cylinder provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, the plastic liner 1 and the fastener 3 are an integrally-molded structure.

[0053] The sealing structure of the plastic liner of the high-pressure gas cylinder of the above structure is achieved by setting the plastic liner 1 and the fastener 3 as an integral injection molding structure, that is, when making the plastic liner 1, the fastener 3 is first placed in the mold, so that when the injection molding material is poured into the mold, the injection molding material can wrap the fastener 3, and the part of the molded fixing part on the plastic liner 1 can be connected to the fastener 3, so that the fastener 3 can be fixed at the opening structure 11 of the plastic liner 1, and there can be no gap between the fastener 3 and the opening structure 11, so as to prevent the high-pressure gas stored in the gas storage cavity from leaking to the outside through the gap.

[0054] The sealing structure of the plastic liner of the high-pressure gas cylinder provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, the fastener 3 is a metal insert ring, and the fastener 3 is formed by stamping or wire cutting.

[0055] The sealing structure of the plastic liner of the high-pressure gas cylinder of the above structure is achieved by setting the fastener 3 as a metal insert ring and setting the fastener 3 to be formed by stamping or wire cutting, so that the cross-sectional shape of the fastener 3 is circular, and when connected to the connecting member 2, the opening structure 11 formed on the inner wall surface of the fastener 3 can abut against the outer wall surface of the connecting member 2 to achieve an interference fit. By making the fastener 3 by stamping or wire cutting, it can be ensured that the axis of the outer wall surface of the fastener 3 and the axis of the inner wall surface are colinear, that is, the cross-section of the outer wall surface and the cross-section of the inner wall surface remain concentrically arranged, so that the inner and outer wall surfaces of the fastener 3 can respectively abut against the outer wall surface in the connecting frame and the inner wall surface of the opening structure 11, and simultaneously achieve an interference fit.

[0056] The sealing structure of the plastic liner of the high-pressure gas cylinder provided by the present invention is provided by a fastener 3 arranged in the plastic liner 1 and a connector 2 connected to the plastic liner 1, wherein the plastic liner 1 has a gas storage chamber capable of storing high-pressure gas and an opening structure 11 connected to the gas storage chamber, that is, the gas storage chamber is connected to the outside through the opening structure 11, so that the high-pressure gas can flow into or out of the gas storage chamber through the opening structure 11, and the connector 2 has a connecting portion, and the connecting portion 2 can be connected to the opening structure 11 under the action of an external force, thereby blocking the opening structure 11, and connecting the gas storage chamber and the outside through the connecting portion, so that the high-pressure gas can only flow into or out of the gas storage chamber through the connecting portion, and at the same time, the connecting portion can also be connected to an external device, so that the high-pressure gas stored in the gas storage chamber can flow into the external device through the connecting portion, and the fastener 3 is arranged in the opening structure 11, and when the connecting portion 2 is connected to the opening structure 11 under the action of an external force, the outer wall surface of the connecting portion 2 will be connected to the opening structure formed on the inner wall surface of the fastener 3. 11 abuts, thereby filling the gap between the connector 2 and the opening structure 11, and then sealing the gap between the connector 2 and the opening structure 11, so that when the high-pressure gas in the gas storage chamber flows into or out of the gas storage chamber through the connecting portion, the high-pressure gas will not leak from the gap between the connector 2 and the opening structure 11. In addition, the cross-sectional shapes of the opening structure 11 and the fastener 3 are both set to be circular, and when the fastener 3 is installed in the opening structure 11, the axis of the fastener 3 is arranged colinearly with the axis of the opening structure 11, so that the cross-sections of the inner and outer wall surfaces of the fastener 3 are arranged concentrically with the cross-section of the inner wall surface of the opening structure 11, and then when the connector 2 is connected to the plastic liner 1 under the action of external force, the connector 2 can abut with the opening structure 11 formed on the inner wall surface of the fastener 3 and achieve an interference fit, thereby sealing the gap between the opening structure 11 and the connector 2, and then after the connector 2 and the plastic liner 1 are connected, the gas storage chamber can only be connected to the outside through the connecting portion, which is beneficial to improving the sealing performance of the plastic liner 1.

[0057] Example 2

[0058] This embodiment provides an injection mold structure, such as Figure 3 and Figure 4 As shown, it includes a cylindrical mold insert body 4, a receiving cavity for forming an opening structure (11), and a plurality of fixing structures 5 for fixing the fastener 3 during the injection molding process. The body 4 has a receiving cavity for forming the opening structure 11, and a plurality of fixing structures 5 are arranged at intervals in the receiving cavity. Any fixing structure 5 is suitable for connecting with the fastener 3 to fix the fastener 3 in the receiving cavity, and when the injection molding material is injected into the receiving cavity under the action of an external force, the injection molding material makes the fastener 3 and the opening structure 11 an injection-molded integrated structure.

[0059] The injection mold structure of the above structure is provided with a housing cavity having a molding opening structure 11 in the main body 4 and a plurality of fixed structures 5 arranged at intervals in the housing cavity. When the fastener 3 is installed in the main body 4, the fastener 3 needs to be placed in the housing cavity and connected to all the fixed structures 5 arranged in the housing cavity, so that the fastener 3 is fixed in the housing cavity. Then, when the injection molding material is injected into the housing cavity, the injection molding material can wrap the fastener 3, and when the injection molding material is solidified in the housing cavity to form a plastic liner 1, the fastener 3 and the plastic liner 1 will become an integrally molded structure, so that there will be no gap between the fastener 3 and the plastic liner 1, which is beneficial to improving the sealing performance of the plastic liner 1.

[0060] The injection mold structure provided in this embodiment is as follows: Figure 3 and Figure 4 As shown, the fixing structure 5 includes two fixing blocks 51 arranged at an interval. When the fastener 3 is placed in the accommodating cavity, the fastener 3 is suitable to be arranged in the interval so that the two fixing blocks 51 fix the fastener 3.

[0061] The injection mold structure of the above structure includes two fixing blocks 51 by setting a fixing structure 5, and the two fixing blocks 51 are set at an interval, so that when the fastener 3 is placed in the accommodating cavity, the fastener 3 can be clamped in the interval between the two fixing blocks 51, and then the two fixing blocks 51 fix the fastener 3, so that the fastener 3 is fixed on the main body 4, that is, in the accommodating cavity.

[0062] The injection mold structure provided in this embodiment is as follows: Figure 3 and Figure 4 As shown, the two fixing blocks 51 in any fixed structure 5, the wall surfaces abutting against the fastener 3 are concentrically arranged with the outer wall section and the inner wall section of the opening structure 11, so that the fastener 3 is concentrically arranged with the outer wall surface and the inner wall surface of the opening structure 11, and the fastener 3 is abutted against the connecting piece 2 connected to the opening structure 11.

[0063] The injection mold structure of the above structure is arranged so that the wall surface of each fixing block 51 abutting against the fastener 3 is concentrically arranged with the outer wall section and the inner wall section of the opening structure 11, so that when the two fixing blocks 51 fix the fastener 3 in the accommodating cavity and the injection molding material is injected into the accommodating cavity, the outer wall section and the inner wall section of the opening structure 11 formed in the accommodating cavity will be concentrically arranged with the outer wall section and the inner wall section of the fastener 3, and then when the connecting member 2 is connected to the opening structure 11, the outer wall section of the connecting member 2 will be concentrically arranged with the inner wall section of the fastener 3, so that the connecting member 2 and the outer wall surface and the opening structure 11 formed on the inner wall surface of the fastener 3 abut against each other and achieve an interference fit.

[0064] The injection mold structure provided in this embodiment is as follows: Figure 3 and Figure 4 As shown, a plurality of recessed portions are arranged at intervals in the accommodating cavity, and any recessed portion is arranged between two adjacent fixing structures 5, so that when the injection molding material is injected into the accommodating cavity under the action of external force, the injection molding material is formed into a fixing part in the recessed portion to fix the fastener 3.

[0065] The injection mold structure of the above structure is formed by opening a plurality of recessed portions in the accommodating cavity. The recessed portions are recessed grooves in this embodiment. All the recessed portions are arranged at intervals in the accommodating cavity, and each recessed portion is arranged between two adjacent fixing structures 5. Therefore, when the fastener 3 is placed in the accommodating cavity and the injection molding material is injected into the accommodating cavity, the injection molding material will flow into the recessed portion along the fastener 3 and be formed into a fixing part in the recessed portion. During the molding process of the fixing part, since the injection molding material is always connected to the fastener 3, after the fixing part is molded, the fixing part will also be connected to the fastener 3, so that the fixing part can fix the fastener 3 in the accommodating cavity.

[0066] Example 3

[0067] This embodiment provides a molding method, such as Figures 1 to 3 As shown, the process includes placing the fastener 3, injecting the injection molding material and pressing the connecting piece 2. Placing the fastener 3 is to place the fastener 3 in the accommodating cavity under the action of an external force and connect it with the fixing structure 5 arranged in the accommodating cavity so as to place the fastener 3 in the accommodating cavity; injecting the injection molding material is to inject the injection molding material into the accommodating cavity under the action of an external force, so that the injection molding material flows along the surrounding walls of the fastener 3 into the accommodating cavity and converges in a recessed portion arranged in the accommodating cavity to form a fixing piece connected to the fastener 3 in the recessed portion, and fix the fastener 3 in the accommodating cavity; pressing the connecting piece 2 is to press the connecting piece 2 into the air storage cavity of the plastic liner 1 through the opening structure 11 under the action of an external force, so that the connecting piece 2 abuts against the fastener 3, and the sealing piece arranged on the connecting piece 2 seals the gap between the connecting piece 2 and the fastener 3.

[0068] The molding method of the above structure sequentially performs the steps of placing the fastener 3, injecting the injection molding material and pressing the connector 2, so that the fastener 3 can be placed in the accommodating cavity of the main body 4 under the action of an external force, and in this process, the fastener 3 is connected to the fixing structure 5 arranged in the accommodating cavity, so that the fastener 3 is fixed in the accommodating cavity by the fixing structure 5, and then, the injection molding material is injected into the accommodating cavity under the action of an external force, so that the injection molding material flows into the accommodating cavity along the fastener 3 and converges in the recessed portion arranged in the accommodating cavity, so that the injection molding material is solidified in the accommodating cavity to form a plastic liner 1, and at the same time, the injection molding material The material is formed into a fixing part in the recessed portion and connected to the fastener 3, thereby fixing the fastener 3 on the plastic liner 1. Finally, when the external force is applied, the connector 2 is pressed into the air storage cavity through the opening structure 11, and the outer wall surface of the connector 2 and the opening structure 11 formed on the inner wall surface of the fastener 3 abut against each other, so that the sealing part on the connector 2 fills the gap between the connector 2 and the fastener 3 to seal the gap between the connector 2 and the fastener 3, and finally the plastic liner 1 can only be connected to the air storage cavity and the outside world through the connecting part on the connector 2, which is beneficial to improve the sealing performance of the plastic liner 1.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An injection mold structure for molding a sealing structure of a plastic liner of a high-pressure gas cylinder, characterized in that: include: A body (4) having a receiving cavity with a molded opening structure (11), wherein a plurality of fixing structures (5) are arranged at intervals in the receiving cavity, and any of the fixing structures (5) is suitable for connecting with a fastener (3) to fix the fastener (3) in the receiving cavity, and when an injection molding material is injected into the receiving cavity under the action of an external force, the injection molding material enables the fastener (3) and the opening structure (11) to form an integral injection molding structure; The sealing structure of the plastic liner of the high-pressure gas cylinder comprises: A plastic liner (1) having an opening structure (11) and an air storage cavity which are arranged in communication with each other; A connecting piece (2) having a connecting portion, and the connecting piece (2) is suitable for connecting with the opening structure (11) under the action of an external force, so as to connect the air storage chamber with the outside world through the connecting portion; A fastener (3), wherein the fastener (3) is arranged in the opening structure (11), and when the connecting member (2) is connected to the opening structure (11) under the action of an external force, the opening structure (11) formed in the inner wall surface of the fastener (3) is suitable for abutting against the outer wall surface of the connecting member (2) to fill the gap between the connecting member (2) and the opening structure (11); The cross-sectional shapes of the opening structure (11) and the fastener (3) are both arranged to be circular, and the axis of the fastener (3) and the axis of the opening structure (11) are arranged colinearly, so that when the connecting member (2) is connected to the opening structure (11), the opening structure (11) formed in the inner wall surface of the fastener (3) abuts against the outer wall surface of the connecting member (2).

2. The injection mold structure according to claim 1, characterized in that: A plurality of connection parts are provided on one side of the opening structure (11), the connection parts are conformally matched with the fixed structure (5) and are suitable for connection with the fixed structure (5), and the fasteners (3) are exposed in the connection parts.

3. The injection mold structure according to claim 2, characterized in that: The plastic liner (1) further comprises a fixing member arranged in the opening structure (11); when the fastener (3) is arranged in the opening structure (11), the fixing member is suitable for connecting with the fastener (3) to fix the fastener (3).

4. The injection mold structure according to claim 3, characterized in that: The connecting member (2) is also provided with a mounting portion; and further comprises a sealing member, which is arranged in the mounting portion so that when the connecting member (2) abuts against the fastener (3) under the action of an external force, the sealing member is suitable for sealing the gap between the connecting member (2) and the fastener (3).

5. The injection mold structure according to any one of claims 1 to 4, characterized in that: The plastic liner (1) and the fastener (3) are an integrally-molded structure.

6. The injection mold structure according to claim 5, characterized in that: The fastener (3) is a metal insert ring, and the fastener (3) is formed by stamping or wire cutting.

7. The injection mold structure according to claim 1, characterized in that: The fixing structure (5) comprises two fixing blocks (51) arranged at an interval, and when the fastener (3) is placed in the accommodating cavity, the fastener (3) is suitable for being arranged in the interval so that the two fixing blocks (51) fix the fastener (3).

8. The injection mold structure according to claim 7, characterized in that: The two fixing blocks (51) in any one of the fixing structures (5) have walls abutting against the fasteners (3) that are concentrically arranged with the outer wall section and the inner wall section of the opening structure (11), so that the fasteners (3) are concentrically arranged with the outer wall section and the inner wall section of the opening structure (11), and the fasteners (3) are abutted against the connecting piece (2) connected to the opening structure (11).

9. The injection mold structure according to claim 7 or 8, characterized in that: A plurality of recessed portions are arranged at intervals in the accommodating cavity, and any of the recessed portions is arranged between two adjacent fixing structures (5), so that when the injection molding material is injected into the accommodating cavity under the action of an external force, the injection molding material is formed into a fixing part in the recessed portion to fix the fastener (3).

10. A molding method, used for the injection mold structure according to any one of claims 1 to 9, characterized in that: The steps include: Placing the fastener (3), and placing the fastener (3) in the accommodating cavity under the action of an external force, and connecting the fastener (3) with a fixing structure (5) disposed in the accommodating cavity, so as to place the fastener (3) in the accommodating cavity; Injecting the injection molding material into the accommodating cavity under the action of an external force, so that the injection molding material flows along the surrounding walls of the fastener (3) into the accommodating cavity and converges in a recessed portion provided in the accommodating cavity, so as to form a fixing piece connected to the fastener (3) in the recessed portion, and fix the fastener (3) in the accommodating cavity; The press-fit connector (2) is pressed into the air storage cavity of the plastic liner (1) through the opening structure (11) under the action of an external force, so that the connector (2) abuts against the fastener (3), and a sealing member provided on the connector (2) seals the gap between the connector (2) and the fastener (3).

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