Embedded bottle mouth sealing structure and manufacturing method of plastic liner carbon fiber wrapped gas cylinder

Abstract

The present application relates to a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure and manufacturing method, the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure includes: the plastic liner bottle mouth includes a bottle mouth neck and a bottle mouth portion that are coaxially arranged and interconnected, a metal reinforcement is embedded in the plastic liner bottle mouth, the metal reinforcement is arranged around the outside of the central axis of the plastic liner bottle mouth, and is fully covered by the plastic liner bottle mouth, the metal reinforcement and the inner wall of the bottle mouth neck form an annular plastic thin layer, the outer peripheral surface of the bottle valve is provided with a radial sealing groove, and a sealing ring is provided in the radial sealing groove, and the sealing ring is configured to be in sealing contact with the plastic thin layer when the bottle valve and the internal thread are connected. In summary, the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure in this embodiment improves the sealing reliability of the plastic liner bottle mouth by embedding the metal reinforcement in the plastic liner bottle mouth, and the metal reinforcement and the bottle mouth neck form a plastic thin layer.

Description

Technical Field

[0001] The present application relates to the technical field of gas cylinder sealing, and in particular to an embedded bottle mouth sealing structure and a manufacturing method for a plastic liner carbon fiber wrapped gas cylinder. Background Art

[0002] Plastic liner fiber-wound hydrogen storage bottles have become an important research direction for high-pressure gaseous hydrogen storage bottles at home and abroad due to their advantages of light weight and high hydrogen storage density. At present, the research on the sealing structure of plastic liner hydrogen storage bottles mainly focuses on the sealing connection and sealing arrangement of dissimilar materials between the plastic liner and the metal bottle mouth. Since the strength and rigidity of the plastic liner bottle mouth are relatively weak and it is sensitive to temperature, in the existing technology, a dissimilar material - a metal valve seat - is usually injection molded or bonded to the wall of the plastic liner bottle mouth. However, due to the large difference in modulus and thermal expansion properties between the plastic liner and the metal valve seat, the seal at the connection between the two becomes a potential leakage path for high-pressure hydrogen, and at the same time, the metal contact seal inevitably suffers from the problem of hydrogen embrittlement.

[0003] To address the above-mentioned issues, many improved technologies have emerged both domestically and internationally. Among the related technologies, CN113669617A discloses a sealing structure for a hydrogen storage bottle with a plastic liner, employing a bottle valve, a sealing ring, and a metal valve seat. After the metal valve seat is connected at the bottle shoulder and the bottle mouth, multiple sealing structures are added. These sealing structures are complex and difficult to disassemble and replace. CN112879792 A discloses a sealing structure for a hydrogen storage bottle with a plastic liner, employing a bottle valve, a sealing ring, and plastic. The plastic sealing contact surface is susceptible to significant radial deformation during high-pressure inflation and deflation, making it difficult to maintain the designed sealing pressure ratio. The increased sealing gap at the bottle mouth sealing ring makes seal failure and leakage more likely to occur.

[0004] In summary, the current sealing method of the bottle mouth of the plastic liner hydrogen storage bottle is complex in structure and is prone to sealing failure. Summary of the Invention

[0005] Based on this, it is necessary to provide a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure and manufacturing method to address the problem that the current plastic liner hydrogen storage bottle mouth sealing method has a complex structure and is prone to sealing failure.

[0006] A plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure, comprising:

[0007] A plastic liner bottle mouth, a bottle valve, a sealing ring, and a carbon fiber winding layer, wherein the plastic liner bottle mouth includes a bottle neck and a bottle mouth that are coaxially arranged and interconnected, and the bottle neck and the bottle mouth are made of the same material as the plastic liner;

[0008] A metal reinforcement is embedded in the mouth of the plastic liner. The metal reinforcement is arranged around the outside of the central axis of the mouth of the plastic liner and is completely covered by the mouth of the plastic liner. The metal reinforcement and the inner wall of the neck of the mouth of the bottle form an annular plastic layer. The wall thickness of the plastic layer does not exceed 2 mm.

[0009] The inner wall of the bottle mouth is provided with an internal thread connected to the bottle valve, and the metal reinforcement plays a role in reinforcing the bottle mouth;

[0010] A radial sealing groove is provided on the outer circumference of the bottle valve, and the sealing ring is provided in the radial sealing groove. The sealing ring is configured to be in sealing contact with the plastic thin layer when the bottle valve and the internal thread are connected;

[0011] The carbon fiber winding layer is wrapped around the outer side of the bottle neck to provide external support for the bottle neck.

[0012] In one embodiment, the plastic liner bottle mouth and the metal reinforcement are integrally formed.

[0013] In one embodiment, the wall thickness of the plastic thin layer in the circumferential direction is uniform, and the molding of the plastic inner bottle mouth reserves a processing allowance for the plastic thin layer and the internal thread.

[0014] In one embodiment, when the bottle valve is inserted into the bottle mouth of the plastic liner and connected to the internal thread, the plastic thin layer is arranged around the outside of the sealing ring.

[0015] In one embodiment, the dimension of the plastic thin layer along the central axis of the bottle neck is greater than the dimension of the radial sealing groove along the central axis of the bottle neck, ensuring that the sealing ring can fully contact the plastic thin layer after being compressed.

[0016] In one embodiment, the metal reinforcement is provided with a plurality of hollow channels, and the plurality of hollow channels are arranged around the outside of the central axis of the metal reinforcement to increase the bonding strength of the metal reinforcement and the plastic inner liner bottle mouth during the one-piece molding process.

[0017] In one embodiment, the central axis of the metal reinforcement and the central axis of the plastic thin layer are both collinear with the central axis of the bottle mouth of the plastic liner.

[0018] In one embodiment, a bottle shoulder is included. The bottle shoulder is arranged on a side of the bottle neck away from the bottle mouth and connected to the bottle neck. A transition fillet is provided at the connection between the bottle shoulder and the bottle neck.

[0019] In one embodiment, along the central axis of the bottle neck, there are multiple virtual cross sections between the bottle neck and the bottle shoulder, and the multiple virtual cross sections are parallel to each other and perpendicular to the central axis of the bottle neck;

[0020] On any of the virtual cross sections, the difference between the outer diameter of the metal reinforcement and the outer diameter of the transition fillet is equal to a preset value.

[0021] The embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder in this embodiment is achieved by embedding a metal reinforcement in the bottle mouth of the plastic liner to reinforce the bottle mouth and bottle neck of the plastic liner bottle mouth at the same time. An annular plastic thin layer is formed between the metal reinforcement and the inner wall of the bottle neck. After the plastic thin layer contacts the sealing ring, a plastic thin layer sealing area is formed. The metal reinforcement can provide sufficient rigidity support for the plastic thin layer sealing area, thereby reducing the deformation tendency of the plastic thin layer sealing area during the filling and discharging of hydrogen in the gas cylinder. By setting the wall thickness of the plastic thin layer to not more than 2mm, the deformation of the plastic thin layer sealing area along its own radial direction can be further reduced, thereby ensuring that the plastic thin layer can maintain a good sealing pressure ratio with the sealing ring, reducing the risk of gas leakage from the sealing contact between the sealing ring and the plastic thin layer, and achieving reliable sealing. By setting a carbon fiber winding layer to wrap around the outside of the bottle neck, the strength of the bottle neck can be further supported. Since the metal reinforcement is embedded in the plastic liner bottle mouth, the metal reinforcement and the plastic liner bottle mouth can be integrally formed with the help of injection molding technology, thereby simplifying the composition of the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder, reducing the complexity of the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder, and reducing the manufacturing cost of the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder.

[0022] To sum up, the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder in this embodiment embeds a metal reinforcement in the bottle mouth of the plastic liner, and the metal reinforcement and the neck of the bottle mouth form an annular plastic thin layer, which eliminates the influence of the metal-plastic liner heterogeneous interface contact sealing, reduces the complexity and manufacturing cost of the bottle mouth sealing structure, ensures the pressing force and sealing pressure ratio of the sealing ring and the bottle mouth, and improves the sealing reliability of the plastic liner bottle mouth during operation.

[0023] This application also proposes a method for manufacturing a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure, which is used to manufacture the aforementioned plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure, comprising:

[0024] The metal reinforcement is manufactured by casting, 3D printing or machining;

[0025] The metal reinforcement is placed in a molding die, positioned and fixed, and then integrally injection molded;

[0026] The inner wall of the injection-molded plastic liner bottle mouth is mechanically processed to ensure the processing size of the internal thread and the wall thickness of the plastic thin layer, as well as the coaxiality of the central axis of the internal thread and the plastic thin layer with the central axis of the plastic liner bottle mouth;

[0027] After the sealing ring is installed in the radial sealing groove of the bottle valve, the bottle valve is inserted into the bottle mouth of the plastic liner and connected to the internal thread to achieve compression and sealing contact between the sealing ring and the plastic thin layer.

[0028] The method for manufacturing the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder in this embodiment is to place the metal reinforcement in the molding mold and fix it, so that during the process of injection molding the plastic liner bottle mouth, the metal reinforcement can be integrally formed with the plastic liner bottle mouth and fully wrapped by the plastic liner bottle mouth. With the help of the processing allowance of the inner wall of the plastic liner bottle mouth reserved in the injection molding process, the inner wall of the plastic liner bottle mouth after injection molding is subjected to a small amount of mechanical processing to complete the processing of the plastic liner bottle mouth, including the processing of the internal thread and the plastic thin layer, to ensure the processing size of the internal thread and the wall thickness of the plastic thin layer, as well as the coaxiality of the central axis of the internal thread and the plastic thin layer with the central axis of the plastic liner bottle mouth. Next, a sealing ring is installed in the radial sealing groove of the bottle valve, and the bottle valve is inserted into the plastic liner bottle mouth so that the bottle valve is connected to the internal thread and the sealing ring is pressed and sealed with the plastic thin layer. Finally, a carbon fiber winding layer is wrapped around the outside of the bottle neck to provide external support to the bottle neck. The bottle valve in this embodiment can be purchased directly from the commercial market. After the plastic liner bottle mouth is processed, it can be directly installed and connected with the bottle valve and the sealing ring to realize the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder.

[0029] To sum up, the manufacturing method of the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder in this embodiment is simple and efficient in the manufacturing process, which can reduce the manufacturing process error, reduce the manufacturing cost of the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder, and improve the sealing reliability of the plastic liner bottle mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1This is a cross-sectional view of the embedded bottle mouth sealing structure of a plastic liner carbon fiber wrapped gas cylinder in one embodiment of the present application.

[0032] Figure 2 for Figure 1 The structure diagram shown is a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure when the plastic liner bottle mouth is not processed with internal threads.

[0033] Figure 3 for Figure 2 The diagram shows the structure of the plastic liner bottle mouth after the internal thread is processed.

[0034] Figure 4 for Figure 1 A top view of the metal reinforcement in the embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder is shown.

[0035] Figure 5 for Figure 4 A cross-sectional view of the metal reinforcement shown at point A.

[0036] Figure 6 This is a flowchart of a method for manufacturing an embedded bottle mouth sealing structure of a plastic liner carbon fiber wrapped gas cylinder in one embodiment of the present application.

[0037] Reference numerals:

[0038] Embedded bottle mouth sealing structure of plastic liner carbon fiber wrapped gas cylinder 1000;

[0039] Plastic liner bottle mouth 1100, bottle neck 1110, transition fillet 1111, plastic thin layer 1112, bottle mouth 1120, internal thread 1121;

[0040] Metal reinforcement 1200 , hollow channel 1210 , first channel 1211 , second channel 1212 , third channel 1213 ;

[0041] Bottle shoulder 1300;

[0042] Carbon fiber winding layer 1400;

[0043] Bottle valve 1500, external thread 1510, radial sealing groove 1520;

[0044] Sealing ring 1600. DETAILED DESCRIPTION

[0045] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 a limitation on this application.

[0047] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0048] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0051] See also Figures 1 to 3 , Figure 1 A cross-sectional view of an embedded bottle mouth sealing structure of a plastic liner carbon fiber wrapped gas cylinder in one embodiment of the present application is shown. The embedded bottle mouth sealing structure 1000 of a plastic liner carbon fiber wrapped gas cylinder provided in one embodiment of the present application includes: a plastic liner bottle mouth 1100, a bottle valve 1500, a sealing ring 1600 and a carbon fiber wrapped layer 1400. The plastic liner bottle mouth 1100 includes a bottle mouth neck 1110 and a bottle mouth mouth 1120 that are coaxially arranged and interconnected. The bottle mouth neck 1110 and the bottle mouth mouth 1120 are made of the same material as the plastic liner (not shown). A metal reinforcement 1200 is embedded in the plastic liner bottle mouth 1100. The metal reinforcement 1200 is arranged around the outside of the central axis of the plastic liner bottle mouth 1100 and is secured to the plastic liner bottle mouth 1100. 100 is fully covered, the metal reinforcement 1200 and the inner wall of the bottle neck 1110 form an annular plastic thin layer 1112, the wall thickness of the plastic thin layer 1112 does not exceed 2 mm, the inner wall of the bottle mouth 1120 is provided with an internal thread 1121 connected to the bottle valve 1500, and the metal reinforcement 1200 reinforces the bottle mouth 1120. A radial sealing groove 1520 is provided on the outer peripheral surface of the bottle valve 1500, and a sealing ring 1600 is provided in the radial sealing groove 1520. The sealing ring 1600 is configured to be in sealing contact with the plastic thin layer 1112 when the bottle valve 1500 and the internal thread 1121 are connected. The carbon fiber winding layer 1400 is wrapped around the outside of the bottle neck 1110 to provide external support to the bottle neck 1110.

[0052] The mouth sealing structure 1000 of the carbon fiber-wrapped plastic-liner gas cylinder in this embodiment simultaneously reinforces the mouth 1120 and neck 1110 of the plastic-liner mouth 1100 by embedding a metal reinforcement 1200 within the plastic-liner mouth 1100. An annular thin plastic layer 1112 is formed between the metal reinforcement 1200 and the inner wall of the neck 1110. The plastic layer 1112 contacts the sealing ring 1600 to form a thin plastic layer sealing area (not shown). The metal reinforcement 1200 provides sufficient rigidity support to the thin plastic layer sealing area, mitigating deformation of the thin plastic layer sealing area during hydrogen filling and discharging. By setting the wall thickness of the plastic thin layer 1112 to no more than 2 mm, the radial deformation of the plastic thin layer sealing area can be further reduced, thereby ensuring that the plastic thin layer 1112 can maintain a good sealing pressure ratio with the sealing ring 1600, reducing the risk of gas leakage from the sealed contact point between the sealing ring 1600 and the plastic thin layer 1112, and achieving a reliable seal. By providing a carbon fiber wrapped layer 1400 wrapped around the outside of the bottle neck 1110, the bottle neck 1110 is further strengthened. Because the metal reinforcement 1200 is embedded in the plastic liner bottle mouth 1100, the metal reinforcement 1200 and the plastic liner bottle mouth 1100 can be integrally formed using injection molding technology, thereby simplifying the composition of the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000, reducing the complexity of the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000, and reducing the manufacturing cost of the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000.

[0053] To sum up, the embedded bottle mouth sealing structure 1000 of the plastic liner carbon fiber wrapped gas cylinder in this embodiment, by embedding the metal reinforcement 1200 in the plastic liner bottle mouth 1100, the metal reinforcement 1200 and the bottle mouth neck 1110 form an annular plastic thin layer 1112, thereby eliminating the influence of the metal-plastic liner heterogeneous interface contact sealing, reducing the complexity and manufacturing cost of the bottle mouth sealing structure, ensuring the pressing force and sealing pressure ratio of the sealing ring 1600 and the bottle mouth 1120 of the sealing contact, and improving the sealing reliability of the plastic liner bottle mouth 1100 during operation.

[0054] It should be further explained that since the metal reinforcement 1200 is completely wrapped inside the plastic inner liner bottle mouth 1100, there is no need for an additional sealing ring between the metal reinforcement 1200 and the plastic inner liner bottle mouth 1100, and there is no debonding problem in the connection between the reinforcement 1200 and the plastic inner liner bottle mouth 1100, and gas will not leak from the connection between the metal reinforcement 1200 and the plastic inner liner bottle mouth 1100.

[0055] In addition, compared with setting the sealing ring 1600 on the bottle mouth 1100 of the plastic liner, the sealing ring 1600 in this embodiment is set in the radial sealing groove 1520 on the bottle valve 1500. On the one hand, it simplifies the structure and sealing layout of the bottle mouth 1100 of the plastic liner, reducing the risk of gas leakage; on the other hand, it facilitates the replacement and disassembly of the sealing ring 1600, reducing the sealing cost.

[0056] Please continue reading Figures 1 to 3 In some embodiments, the plastic liner bottle mouth 1100 and the metal reinforcement 1200 are integrally formed.

[0057] In this embodiment, by arranging the plastic liner bottle mouth 1100 and the metal reinforcement 1200 to be integrally molded, the metal reinforcement 1200 can be fully wrapped by the plastic liner bottle mouth 1100 during the molding process of the plastic liner bottle mouth 1100, thereby simplifying the process required to embed the metal reinforcement 1200 inside the plastic liner bottle mouth 1100, improving the manufacturing accuracy of the bottle mouth structure, and reducing the manufacturing cost of the bottle mouth sealing structure.

[0058] In some embodiments, the bottle neck 1110 and the bottle mouth 1120 are coaxially arranged along a first direction and are connected to each other. The first direction is any direction in three-dimensional space.

[0059] In some embodiments, an external thread 1510 is provided at a position corresponding to the bottle mouth 1120 on the outer circumference of the bottle valve 1500 along the first direction, and the external thread 1510 is threadedly connected to the internal thread 1121; a radial sealing groove 1520 is provided at a position corresponding to the bottle neck 1110 on the outer circumference of the bottle valve 1500 along the first direction, and the radial sealing groove 1520 is arranged around the outside of the central axis of the bottle valve 1500.

[0060] Please continue reading Figures 1 to 3 In some embodiments, the wall thickness of the plastic thin layer 1112 in the circumferential direction is uniform, and the plastic inner bottle mouth 1100 is formed with a reserved processing allowance for the plastic thin layer 1112 and the internal thread 1121 .

[0061] In this embodiment, by setting a reserved processing allowance for the plastic thin layer 1112 and the internal thread 1121 after the plastic inner bottle mouth 1100 is formed, it is convenient for the staff to machine the inner wall of the bottle mouth 1120, reduce the surface roughness of the inner wall of the plastic thin layer 1112, and process the internal thread 1121 on the inner wall of the bottle neck 1110.

[0062] In some embodiments, after the plastic liner bottle mouth 1100 is formed, a processing allowance for the plastic thin layer 1112 and the internal thread 1121 is reserved, and the processing allowance is greater than 0 mm and less than or equal to 3 mm. The smaller processing allowance can reduce the number of times the staff needs to process the inner wall of the plastic thin layer 1112 to the target accuracy, and the number of times the tool is changed during the process of processing the internal thread 1121 on the inner wall of the bottle neck 1110.

[0063] See also Figure 1 In some embodiments, when the bottle valve 1500 is inserted into the plastic liner bottle mouth 1100 and connected to the internal thread 1121 , the plastic thin layer 1112 is arranged around the outside of the sealing ring 1600 .

[0064] In this embodiment, by arranging the bottle valve 1500 and connecting it to the internal thread 1121, the plastic thin layer 1112 is arranged around the outside of the sealing ring 1600, so as to ensure that the outer surface of the sealing ring 1600 contacts the inner wall of the plastic thin layer 1112, thereby achieving sealed contact between the sealing ring 1600 and the plastic thin layer 1112.

[0065] See also Figure 1 In some embodiments, the dimension of the plastic thin layer 1112 along the central axis of the bottle neck 1110 is larger than the dimension of the radial sealing groove 1520 along the central axis of the bottle neck 1110, ensuring that the sealing ring 1600 can fully contact the plastic thin layer 1112 after being compressed.

[0066] In this embodiment, by setting the size of the plastic thin layer 1112 along the central axis of the bottle neck 1110 to be larger than the size of the radial sealing groove 1520 along the central axis of the bottle neck 1110, the outer surface of the sealing ring 1600 can be completely sealed in contact with the plastic thin layer 1112 surrounding the outside of the sealing ring 1600, thereby ensuring the sealed contact between the sealing ring 1600 and the plastic thin layer 1112.

[0067] See 4 Figure 5 In some embodiments, a plurality of hollow channels 1210 are provided on the metal reinforcement 1200, and the plurality of hollow channels 1210 are arranged around the outside of the central axis of the metal reinforcement 1200 to increase the bonding strength of the metal reinforcement 1200 and the plastic inner liner bottle mouth 1100 during the one-piece molding process.

[0068] In this embodiment, a plurality of hollow channels 1210 are arranged around the outside of the central axis of the metal reinforcement 1200, so that during the injection molding of the plastic liner bottle mouth 1100, the injection liquid can fully flow along the hollow channels 1210, thereby improving the bonding strength between the plastic liner bottle mouth 1100 and the metal reinforcement 1200 during the injection molding process.

[0069] In some embodiments, the metal reinforcement 1200 is made of aluminum alloy or stainless steel.

[0070] In some embodiments, six hollow channels 1210 are provided on the metal reinforcement 1200 . The six hollow channels 1210 are arranged around the outside of the central axis of the metal reinforcement 1200 and are evenly distributed.

[0071] In some embodiments, each hollow channel 1210 includes a first channel 1211, a second channel 1212 and a third channel 1213. The first channel 1211 is a first guide channel, which is in the form of a hole-type channel. The first guide channel extends along the central axis of the metal reinforcement 1200. The second channel 1212 is a second guide groove, which is connected to the first guide channel. The angle between the two groove walls of the second guide groove arranged in a direction around the outer contour of the metal reinforcement 1200 is between 20° and 30°. The third channel 1213 is a third guide groove, and the angle between the two groove walls of the third guide groove arranged in a direction around the inner contour of the metal reinforcement 1200 is between 20° and 30°.

[0072] In some embodiments, each first flow guide channel is interconnected with the corresponding third flow guide groove, so that the injection liquid can fully flow along the hollow channel.

[0073] In some embodiments, the symmetry axis of each second guide groove is coaxial and collinear with the symmetry axis of the corresponding third guide groove.

[0074] See also Figures 1 to 3 In some embodiments, the central axis of the metal reinforcement 1200 and the central axis of the plastic thin layer 1112 are both collinear with the central axis of the plastic liner bottle mouth 1100 .

[0075] See also Figure 2 In some embodiments, the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000 includes a bottle shoulder 1300, which is arranged on the side of the bottle mouth neck 1110 away from the bottle mouth mouth 1120 and is connected to the bottle mouth neck 1110, and a transition fillet 1111 is provided at the connection between the bottle shoulder 1300 and the bottle mouth neck 1110.

[0076] In this embodiment, by setting the transition fillet 1111, a fixing point can be provided for the 1400 carbon fiber winding layer, and at the same time, the force on the bottle neck 1110 when the bottle valve 1500 is connected to the bottle mouth 1120 is reduced.

[0077] In some embodiments, the wall thickness of the mouth 1120 is greater than the wall thickness of the shoulder 1300 .

[0078] In this embodiment, by setting the bottle mouth 1120 to have a larger wall thickness, the strength of the bottle mouth 1120 can be enhanced, and the strength of the threaded connection between the bottle valve 1500 and the bottle mouth 1120 can be improved.

[0079] See also Figure 3 In some embodiments, along the central axis of the bottle neck 1110, there are multiple virtual cross-sections (not shown) between the bottle neck 1110 and the bottle shoulder 1300. The multiple virtual cross-sections are parallel to each other and perpendicular to the central axis of the bottle neck 1110. On any virtual cross-section, the difference between the outer diameter of the metal reinforcement 1200 and the outer diameter of the transition fillet 1111 is equal to a preset value.

[0080] In this embodiment, by setting multiple virtual cross-sections between the bottle neck 1110 and the bottle shoulder 1300, the multiple virtual cross-sections are parallel to each other and perpendicular to the central axis of the bottle neck 1110. On any virtual cross-section, the difference between the outer diameter of the metal reinforcement 1200 and the outer diameter of the transition fillet 1111 is equal to a preset value, so that the outer peripheral surface of the metal reinforcement 1200 can be bent along the transition direction of the transition fillet 1111, further improving the force on the bottle neck 1110 when the bottle valve 1500 is installed in the plastic liner bottle mouth 1100, thereby ensuring the strength of the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000.

[0081] See also Figure 6 , Figure 6 A flowchart of a method for manufacturing a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure in one embodiment of the present application is shown. A method for manufacturing a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure in one embodiment of the present application is provided, which is used to manufacture the aforementioned plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure 1000, comprising:

[0082] S100: Manufacturing a metal reinforcement 1200 by casting, 3D printing, or machining.

[0083] S200: After the metal reinforcement 1200 is placed in a molding die (not shown) and fixed, it is subjected to integral injection molding.

[0084] S300: The inner wall of the injection-molded plastic liner bottle mouth 1100 is machined to ensure the processing size of the internal thread 1121 and the wall thickness of the plastic thin layer 1112, as well as the coaxiality of the central axis of the internal thread 1121 and the plastic thin layer 1112 with the central axis of the plastic liner bottle mouth 1100.

[0085] S500: After the sealing ring 1600 is installed in the radial sealing groove 1520 of the bottle valve 1500, the bottle valve 1500 is inserted into the bottle mouth 1100 of the plastic liner so that the bottle valve 1500 is connected to the internal thread 1121 to achieve compression and sealing contact between the sealing ring 1600 and the plastic thin layer 1112.

[0086] In the method for manufacturing the bottle mouth sealing structure of a plastic liner carbon fiber wrapped gas cylinder of this embodiment, by placing a metal reinforcement 1200 in a mold and fixing it, the metal reinforcement 1200 can be integrally formed with the plastic liner bottle mouth 1100 during the injection molding process of the mold, and fully enclosed by the plastic liner bottle mouth. By utilizing the machining allowance of the inner wall of the plastic liner bottle mouth 1100 reserved during the injection molding process, the inner wall of the plastic liner bottle mouth 1100 after injection molding is subjected to a small amount of mechanical processing to complete the processing of the plastic liner bottle mouth 1100, including the processing of the internal thread 1121 and the plastic thin layer 1112, to ensure the machining dimensions of the internal thread 1121 and the wall thickness of the plastic thin layer 1112, as well as the coaxiality of the central axis of the internal thread 1121 and the plastic thin layer 1112 with the central axis of the plastic liner bottle mouth 1100. Next, install the sealing ring 1600 in the radial sealing groove 1520 of the bottle valve 1500, insert the bottle valve 1500 into the plastic liner bottle mouth 1100, connect the bottle valve 1500 to the internal thread 1121, and press the sealing ring 1600 into sealing contact with the plastic thin layer 1112. Finally, wrap the carbon fiber winding layer 1400 around the outside of the bottle neck 1110, and provide external support to the bottle neck 1110 through the carbon fiber winding layer 1400. The bottle valve 1500 in this embodiment can be purchased directly from a commercial source, and after the plastic liner bottle mouth 1100 is processed, it is directly installed and connected to the bottle valve 1500 and the sealing ring 1600, thereby realizing the embedded bottle mouth sealing structure 1000 of the plastic liner carbon fiber wrapped gas cylinder.

[0087] To sum up, the manufacturing method of the embedded bottle mouth sealing structure 1000 of the plastic liner carbon fiber wrapped gas cylinder in this embodiment and the manufacturing process of the embedded bottle mouth sealing structure 1000 of the plastic liner carbon fiber wrapped gas cylinder are simple and efficient, which can reduce the manufacturing process error, reduce the manufacturing cost of the embedded bottle mouth sealing structure 1000 of the plastic liner carbon fiber wrapped gas cylinder, and improve the sealing reliability of the plastic liner bottle mouth 1100.

[0088] In some embodiments, after step S300 and before step S500, step S400 is further included: winding the processed plastic liner bottle mouth 1100 and bottle shoulder 1300 together with the plastic liner with a carbon fiber winding layer 1400.

[0089] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure, characterized in that: The plastic liner bottle mouth comprises a plastic liner bottle mouth, a bottle valve, a sealing ring and a carbon fiber winding layer. The plastic liner bottle mouth comprises a bottle mouth neck and a bottle mouth mouth that are coaxially arranged and interconnected. The bottle mouth neck and the bottle mouth mouth are made of the same material as the plastic liner. A metal reinforcement is embedded in the mouth of the plastic liner. The metal reinforcement is arranged around the outside of the central axis of the mouth of the plastic liner and is completely covered by the mouth of the plastic liner. The metal reinforcement and the inner wall of the neck of the mouth of the bottle form an annular plastic layer. The wall thickness of the plastic layer does not exceed 2 mm. The inner wall of the bottle mouth is provided with an internal thread connected to the bottle valve, and the metal reinforcement plays a role in reinforcing the bottle mouth; A radial sealing groove is provided on the outer circumference of the bottle valve, and the sealing ring is provided in the radial sealing groove. The sealing ring is configured to be in sealing contact with the plastic thin layer when the bottle valve and the internal thread are connected; The carbon fiber winding layer is wrapped around the outer side of the bottle neck to provide external support for the bottle neck; The plastic liner bottle mouth and the metal reinforcement are integrally formed; The wall thickness of the plastic thin layer in the circumferential direction is uniform, and the molding of the plastic inner bottle mouth reserves a processing allowance for the plastic thin layer and the internal thread; The metal reinforcement is provided with a plurality of hollow channels, and the plurality of hollow channels are arranged around the outside of the central axis of the metal reinforcement to increase the bonding strength of the metal reinforcement and the plastic liner bottle mouth during the integral molding process.

2. The embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder according to claim 1 is characterized in that: The bottle valve is inserted into the bottle mouth of the plastic liner and connected with the internal thread. The plastic thin layer is arranged around the outer side of the sealing ring.

3. The embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder according to claim 1 is characterized in that: The size of the plastic thin layer along the central axis of the bottle neck is larger than the size of the radial sealing groove along the central axis of the bottle neck, ensuring that the sealing ring can fully contact the plastic thin layer after being compressed.

4. The embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder according to claim 1 is characterized in that: The central axis of the metal reinforcement and the central axis of the plastic thin layer are both collinear with the central axis of the bottle mouth of the plastic liner.

5. The embedded bottle mouth sealing structure of a plastic liner carbon fiber wrapped gas cylinder according to any one of claims 1 to 4, characterized in that: The bottle shoulder is provided on a side of the bottle neck away from the bottle mouth and connected to the bottle neck. A transition fillet is provided at the connection between the bottle shoulder and the bottle neck.

6. The embedded bottle mouth sealing structure of the plastic liner carbon fiber wrapped gas cylinder according to claim 5 is characterized in that: Along the central axis of the bottle neck, there are multiple virtual cross sections between the bottle neck and the bottle shoulder, and the multiple virtual cross sections are parallel to each other and perpendicular to the central axis of the bottle neck; On any of the virtual cross sections, the difference between the outer diameter of the metal reinforcement and the outer diameter of the transition fillet is equal to a preset value.

7. A method for manufacturing a plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure, used to manufacture the plastic liner carbon fiber wrapped gas cylinder embedded bottle mouth sealing structure as described in any one of claims 1 to 6, characterized in that: The production method comprises the following steps: The metal reinforcement is manufactured by casting, 3D printing or machining; The metal reinforcement is placed in a molding die, positioned and fixed, and then integrally injection molded; The inner wall of the injection-molded plastic liner bottle mouth is mechanically processed to ensure the processing size of the internal thread and the wall thickness of the plastic thin layer, as well as the coaxiality of the central axis of the internal thread and the plastic thin layer with the central axis of the plastic liner bottle mouth; After the sealing ring is installed in the radial sealing groove of the bottle valve, the bottle valve is inserted into the bottle mouth of the plastic liner and connected to the internal thread to achieve compression and sealing contact between the sealing ring and the plastic thin layer.

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