Composite material air cylinder

Abstract

The utility model provides a composite material air cylinder, which relates to the technical field of compressed air storage and comprises an inner container, insert threaded seats are mounted at the ends of two sides of the inner container, and composite joint seats are mounted on the two insert threaded seats. Each composite connector seat is provided with an air inlet connector, an air taking valve, a water drain valve, a plug, a first sealing ring and a second sealing ring, one composite connector seat is connected with a metal drainage pipe, a fiber resin composite winding layer is arranged on the outer layer of the inner container, and insert threaded seats are arranged at the ends of the two sides of the inner container. The first annular grooves, the vertical grooves and the semicircular protrusions which are connected and attached to one another are arranged on the inner surfaces of the two ends of the inner container and the outer surface of the insert threaded seat, the insert threaded seat can be effectively fixed through the unique structural design, the insert threaded seat is prevented from falling off and moving, and compared with a traditional connecting mode of a metal bottle opening and a plastic inner container, the structure is simple, and use is convenient. And embedding during forming or subsequent winding and pressing can be performed.

Description

Technical Field

[0001] This utility model relates to the field of compressed gas storage technology, and in particular to a composite material gas storage cylinder. Background Technology

[0002] Existing automotive air tanks are mostly made of steel or aluminum alloy. Steel has a high density and requires internal surface rust prevention treatment, while aluminum is expensive and still has a slightly higher density compared to non-metallic materials. Therefore, there is an urgent need to develop a composite material air tank that can achieve lightweight design while meeting safety requirements.

[0003] In the prior art, composite material gas cylinders usually have a metal bottle mouth on the plastic inner liner and a drain pipe connector at the bottom. Considering the different shrinkage rates of the two materials, they are usually made by winding molding. That is, after the metal bottle mouth is formed separately in the inner liner, the metal bottle mouth and the sealing gasket are wound and pressed together by winding layer to connect the metal bottle mouth and the inner liner bottle mouth.

[0004] However, with the above technical solution, the expansion coefficients of the plastic inner liner and the fiber winding layer are different, the sealing gasket cannot be replaced, and the seal fails after delamination and aging of the sealing gasket, resulting in compressed gas leakage. In addition, the joint on the cylinder body interferes with the normal outer winding route, so that the winding can only avoid the joint position or even cut the fiber winding, which makes the winding difficult and the winding efficiency low. The winding layer at the joint is uneven, resulting in a potential strength problem at the joint position.

[0005] Therefore, we propose a composite material gas storage cylinder. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as the different expansion coefficients of the plastic inner liner and the fiber winding layer, the inability to replace the sealing gasket, and the failure of the seal after delamination and aging of the sealing gasket, leading to compressed gas leakage. Furthermore, the joints on the cylinder body interfere with the normal outer winding route, making the winding process have to avoid the joint position or even cut the fiber winding, resulting in high winding difficulty, low winding efficiency, and uneven winding layer at the joint, which leads to potential strength hazards at the joint position.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A composite material gas storage cylinder includes an inner liner, with insert threaded seats installed at both ends of the inner liner, and composite connector seats installed on both insert threaded seats. Each composite connector seat is equipped with an air inlet connector, an air intake valve, a water outlet valve, a plug, a first sealing ring, and a second sealing ring.

[0009] One of the composite connectors is connected to a metal drain pipe, and the outer layer of the inner liner is provided with a fiber resin composite winding layer.

[0010] As a preferred embodiment of this utility model, the end of the metal drain pipe extends to the bottom of the inner liner, and the fiber resin composite winding layer is composed of an axial winding layer and a radial winding layer. The material of the fiber resin composite winding layer is a resin substrate and continuous fibers.

[0011] As a preferred embodiment of this utility model, the inner liner is integrally formed by blow molding, and the material of the inner liner is nylon and polyethylene;

[0012] The inner surfaces of both ends of the inner liner and the outer surfaces of the insert threaded seat are provided with a first annular groove, a vertical groove and several semi-circular protrusions. The first annular groove, vertical groove and several semi-circular protrusions on the inner surfaces of both ends of the inner liner and the outer surfaces of the insert threaded seat are connected and fitted together, thereby fixing the insert threaded seat and preventing the insert threaded seat from falling off and shifting.

[0013] As a preferred embodiment of this utility model, the outer surface of the inner liner is provided with a plurality of radially evenly distributed grooves, which are used to increase the adhesion between the winding layer and the inner liner.

[0014] After the inner liner is formed, its ends need to be machined with an outer circle and milled with a flat surface to facilitate the installation of the composite joint seat and control the compression of the first sealing ring and the second sealing ring.

[0015] As a preferred embodiment of this utility model, the insert threaded seat has a threaded body inside, and the threaded body is used to install the composite connector seat.

[0016] As a preferred embodiment of this utility model, the composite connector seat is provided with a plurality of internal threaded holes, which are used to install an air inlet connector, an air outlet connector, a drain valve and a plug. The outer side of the plurality of internal threaded holes is provided with external threads, which are used to connect to the insert threaded seat. The adjacent surface of the external threads is provided with a second annular groove, which is used to install a second sealing ring.

[0017] The two third annular grooves are used to install the first sealing ring. The outer wall of the composite connector seat is provided with several symmetrical clamping surfaces. The clamping surfaces are used to tighten by a wrench. One of the internal threaded holes is a smooth hole for inserting a metal drain pipe. The metal drain pipe and the composite connector seat are welded together.

[0018] As a preferred embodiment of this utility model, the first sealing ring is in compression contact with the inner liner and the composite connector seat to achieve a seal, and the second sealing ring is in compression contact with the threaded seat and the composite connector seat to achieve an auxiliary seal.

[0019] As a preferred embodiment of this utility model, the metal drain pipe is made of the same material as the composite connector seat, which facilitates welding. The metal drain pipe is L-shaped or Z-shaped. The air inlet connector, air outlet connector, drain valve, and plug internal threads are all provided with sealing rings, and the composite connector seat is in contact with the seal.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] In this invention, by setting insert threaded seats at both ends of the inner liner, and by providing a first annular groove, a vertical groove, and several semi-circular protrusions on the inner surface of both ends of the inner liner and the outer surface of the insert threaded seats, this unique structural design can effectively fix the insert threaded seats, preventing them from falling off or shifting. Compared with the traditional connection method between the metal bottle neck and the plastic inner liner, whether it is embedded during molding or subsequently wound and pressed, this invention greatly enhances the stability of the connection. When subjected to cyclic loads, it can effectively avoid the delamination phenomenon at the joint caused by the large difference in shrinkage rate and thermal expansion coefficient between plastic and metal, thereby completely solving the problem of compressed gas leakage from the delamination point, ensuring the sealing performance and safety of the gas storage cylinder, extending the service life of the gas storage cylinder, and reducing equipment failure and maintenance costs caused by gas leakage.

[0022] All pipe joints, including the air inlet connector, air intake valve, water outlet valve, and plug, are integrated into a composite connector seat, which is then mounted on an insert threaded seat instead of being distributed at different locations on the cylinder body. This allows for the creation of radially evenly distributed grooves on the outer surface of the inner liner, enabling the fiber resin composite winding layer to be wound evenly and continuously on the outer surface of the inner liner without interference from the joints. The fiber resin composite winding layer, composed of axial and radial winding layers, can better exert its reinforcing effect, significantly improving the pressure resistance of the inner liner. By avoiding unevenness and interruptions in the winding layer at the joints, the strength distribution of the entire gas storage cylinder is more uniform, eliminating potential strength hazards at the joint locations, improving the reliability of the gas storage cylinder under high-pressure environments, and reducing safety risks caused by insufficient strength. Attached Figure Description

[0023] Figure 1 A schematic diagram of the exploded structure of the main joint of a composite material gas storage cylinder provided by this utility model;

[0024] Figure 2 A cross-sectional schematic diagram of a jointless main body of a composite material gas storage cylinder provided for this utility model;

[0025] Figure 3 This utility model provides a composite material gas storage cylinder Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 4 An enlarged schematic diagram of the inner liner of a composite material gas storage cylinder and a partial structure at point B, provided for this utility model;

[0027] Figure 5 A schematic diagram of the main body of the composite connector seat for a composite material gas storage cylinder provided by this utility model.

[0028] Legend: 1. Inner liner; 2. Insert threaded seat; 3. Composite connector seat; 4. Air inlet connector; 5. Air intake valve; 6. Water drain valve; 7. Plug; 8. First sealing ring; 9. Second sealing ring; 10. Metal drain pipe; 11. Fiber resin composite winding layer; 12. First annular groove; 13. Vertical groove; 14. Semi-circular protrusion; 15. Groove; 16. Threaded body; 17. Internal threaded hole; 18. External thread; 19. Second annular groove; 20. Third annular groove; 21. Clamping surface; 22. Smooth hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0030] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Example

[0034] like Figure 1-5 As shown, this utility model provides a technical solution: a composite material air storage cylinder, the core component of which is an inner liner 1. Both ends of the inner liner 1 are equipped with carefully designed insert threaded seats 2. These two insert threaded seats 2 play an important role in connecting the inner liner 1 to external components. Their connection structure with the inner liner 1 has been carefully optimized to ensure the firmness and stability of the connection. A composite connector seat 3 is installed on each of the two insert threaded seats 2. The composite connector seat 3 serves as a multi-functional connection hub. Each composite connector seat 3 is equipped with components such as an air inlet connector 4, an air intake valve 5, a water drain valve 6, a plug 7, a first sealing ring 8, and a second sealing ring 9. The integrated design of these components makes the air circuit connection of the air storage cylinder simpler and more efficient, facilitating the control of gas inlet and outlet and the discharge of moisture. It also helps to improve the overall sealing performance, reduce the risk of leakage, and meet various complex usage requirements. It is especially suitable for industrial and civilian fields with high requirements for gas sealing and safety, such as compressed air energy storage systems and air storage cylinders for automotive braking systems.

[0035] One of the composite connector seats 3 is connected to a metal drain pipe 10. The end of the metal drain pipe 10 is precisely designed to extend to the bottom of the inner liner 1. This ensures that the water inside the inner liner 1 can be completely drained during the water discharge operation, preventing water from corroding and damaging the internal structure of the gas storage cylinder and extending the service life of the gas storage cylinder. The outer layer of the inner liner 1 is provided with a fiber resin composite winding layer 11. This winding layer is an important guarantee for the strength of the gas storage cylinder. The fiber resin composite winding layer 11 is composed of an axial winding layer and a radial winding layer. Its material is made of resin substrate and continuous fiber. Through a reasonable winding process, the inner liner 1 can withstand higher pressure, while reducing the overall weight of the gas storage cylinder and improving the material utilization rate. The axial winding layer mainly bears the axial tensile stress, while the radial winding layer enhances the circumferential strength of the inner liner 1. The two work together to form a robust reinforced structure, effectively improving the pressure resistance and stability of the gas storage cylinder, enabling it to work safely and reliably in high-pressure environments.

[0036] The inner liner 1 is manufactured using an advanced blow molding process. This process ensures the overall structural integrity and uniformity of the inner liner 1, reducing potential defects caused by splicing or welding. The inner liner 1 is made of a composite material of nylon and polyethylene. This material combination combines the high strength and wear resistance of nylon with the good flexibility and corrosion resistance of polyethylene, enabling the inner liner 1 to withstand internal pressure while resisting external environmental erosion, ensuring the long-term stable operation of the gas cylinder. The inner surfaces of both ends of the inner liner 1 and the outer surfaces of the insert threaded seat 2 are provided with a first annular groove 12, a vertical groove 13, and several semi-circular protrusions 14. This unique structural design is based on the principle of mechanical connection. Through the nesting and fitting of the grooves and protrusions, the friction and connection strength between the inner liner 1 and the insert threaded seat 2 are greatly increased, effectively preventing the insert threaded seat 2 from falling off or shifting due to vibration, pressure changes, and other factors during use. Compared with the traditional simple connection method, it has higher reliability and stability, providing a solid foundation for the safe operation of the gas cylinder.

[0037] The outer surface of the inner liner 1 is provided with several radially evenly distributed grooves 15. The design of these grooves 15 is not accidental, but based on the principle of material adhesion. During the fiber resin composite winding process, the grooves 15 can increase the contact area and friction between the inner liner 1 and the winding layer, so that the winding layer can adhere more tightly to the surface of the inner liner 1, thereby significantly improving the adhesion between the winding layer and the inner liner 1. This ensures that the two can work together under pressure without delamination or peeling, further enhancing the overall strength and stability of the gas storage cylinder. After the inner liner 1 is formed, its end needs to be machined with an outer circle and a milled surface. This step is crucial. Machined outer circle can ensure the dimensional accuracy and surface roughness of the end, making it fit more tightly with the composite connector seat 3. Milled surface provides a flat reference surface for the installation of the composite connector seat 3, which facilitates accurate control of the compression of the first sealing ring 8 and the second sealing ring 9, ensuring the reliability of the sealing performance and reducing the possibility of gas leakage.

[0038] The insert threaded seat 2 has a threaded body 16 inside. The threaded body 16 is designed with standard thread specifications, providing good versatility and interchangeability, facilitating the installation and disassembly of the composite connector seat 3. The precision and surface quality of the threaded body 16 are strictly controlled to ensure that the connection between the composite connector seat 3 and the insert threaded seat 2 remains stable and reliable under pressure and vibration, without loosening or leakage. The composite connector seat 3 has several internal threaded holes 17. The distribution and size of these internal threaded holes 17 are designed according to the installation requirements of components such as the air inlet connector 4, air outlet connector, drain valve 6, and plug 7. Each internal threaded hole 17 is precision machined to ensure the precision and strength of the thread. This ensures that all components can be securely installed on the composite connector seat 3, and that there will be no loosening or falling off during long-term use. The outer side of the internal threaded hole 17 is provided with an external thread 18, which is used to connect with the insert thread seat 2. Its thread parameters match the internal thread of the insert thread seat 2, ensuring a tight fit between the two. The adjacent surface of the external thread 18 is provided with a second annular groove 19. The size and shape of the second annular groove 19 are optimized and are specifically used to install the second sealing ring 9. When the composite connector seat 3 is tightened with the insert thread seat 2, the second sealing ring 9 is compressed, thereby forming a reliable sealing surface to prevent gas from leaking from the threaded connection and further improving the sealing performance of the gas storage tank.

[0039] Two third annular grooves 20 are used to install the first sealing ring 8. The first sealing ring 8 is in compressive contact with the inner liner 1 and the composite connector seat 3. When the composite connector seat 3 is installed in place, the first sealing ring 8 will undergo elastic deformation under pressure, filling the tiny gap between the inner liner 1 and the composite connector seat 3, thereby achieving effective sealing and preventing gas leakage from the connection between the inner liner 1 and the composite connector seat 3. Several symmetrical clamping surfaces 21 are provided on the outer wall of the composite connector seat 3. The design of these clamping surfaces 21 facilitates tightening operations using a wrench. The operator can apply a uniform torque to the composite connector seat 3 with a wrench to ensure a tight and reliable connection between it and the insert threaded seat 2. It also facilitates the disassembly and replacement of the composite connector seat 3 during installation and maintenance. One of the internal threaded holes 17 has a smooth hole 22 inside. The smooth hole 22 is designed to facilitate the insertion of the metal drain pipe 10. The metal drain pipe 10 and the composite connector seat 3 are connected by welding. The welding process adopts advanced welding technology to ensure... To ensure the strength and sealing of the welded joint and prevent water or air leakage during use, the metal drain pipe 10 is made of the same material as the composite connector seat 3. This design facilitates welding operations, ensures the quality and reliability of the welded joint, and also helps reduce corrosion problems caused by material differences, extending the service life of the air tank. The metal drain pipe 10 is L-shaped or Z-shaped. This shape design is optimized according to the internal structure and drainage requirements of the air tank, ensuring that water accumulated in the inner tank 1 can be effectively drained under different installation positions and usage conditions, preventing water from damaging the air tank. The inlet connector 4, outlet connector, drain valve 6, and plug 7 are all equipped with sealing rings on their internal threads, and they are in contact with the composite connector seat 3 for sealing. The presence of these sealing rings further enhances the sealing performance between each component and the composite connector seat 3, ensuring the reliable sealing of the entire air tank's air circuit system, reducing the risk of gas leakage, and improving the working efficiency and safety of the air tank.

[0040] The connection between the inner surfaces of both ends of the inner liner 1 and the first annular groove 12, vertical groove 13, and several semi-circular protrusions 14 on the outer surface of the insert threaded seat 2 is based on the principle of mechanical interlocking. The semi-circular protrusions 14 are embedded in the corresponding grooves, increasing the contact area and friction between the two. At the same time, the annular groove and vertical groove 13 also play a role in positioning and restricting the displacement of the insert threaded seat 2. This structural design can effectively overcome the differences in shrinkage rate and thermal expansion coefficient between plastic and metal. When the air tank works under different temperature and pressure environments, the connection between the inner liner 1 and the insert threaded seat 2 can still remain stable, preventing compressed gas leakage due to delamination at the joint, and ensuring the sealing performance and safety of the air tank.

[0041] The axial and radial winding layers of the fiber-resin composite winding layer 11 work synergistically through reasonable fiber orientation and resin impregnation to enhance the strength of the inner liner 1. The fibers of the axial winding layer are arranged along the axial direction of the inner liner 1, mainly bearing the axial tensile load and preventing the inner liner 1 from cracking or deforming in the axial direction. The fibers of the radial winding layer are wound around the circumference of the inner liner 1, enhancing the circumferential strength of the inner liner 1 and enabling it to withstand the circumferential stress generated by internal pressure. The resin substrate plays the role of bonding the fibers and transferring the load, fully utilizing the strength of the fibers, and also protecting the fibers from external environmental corrosion. Through this composite structure, the overall strength of the inner liner 1 is significantly improved, meeting the requirements for use under high pressure. Furthermore, due to the uniformity and continuity of the winding layer, safety hazards caused by uneven strength at the joints are avoided.

[0042] The first sealing ring 8 achieves a seal through compression contact with the inner liner 1 and the composite connector seat 3 based on the principle of elastic sealing. When the composite connector seat 3 is installed, the first sealing ring 8 is compressed, and its elastic material deforms, filling the tiny gap between the inner liner 1 and the composite connector seat 3, forming a sealing barrier to prevent gas leakage. The second sealing ring 9 achieves an auxiliary seal through compression contact with the threaded seat and the composite connector seat 3, also utilizing elastic deformation to fill any gaps that may exist at the threaded connection, further enhancing the sealing effect. The sealing rings at the internal threads of the air inlet connector 4, air outlet connector, drain valve 6, and plug 7 also use a similar elastic compression principle, adding an extra layer of sealing protection on top of the threaded connection, ensuring the reliable sealing of the entire gas storage tank's gas circuit system and preventing gas leakage.

[0043] The metal drain pipe 10 extends to the bottom of the inner liner 1, utilizing the principle of gravity drainage. When water accumulates in the air tank, it flows to the bottom of the inner liner 1 under gravity and is discharged through the metal drain pipe 10. The L-shaped or Z-shaped design of the metal drain pipe 10 ensures smooth drainage and prevents backflow, ensuring effective drainage of water from the air tank under various operating conditions. This prevents water from corroding and damaging the internal structure of the air tank, extending its service life.

[0044] Work process summary

[0045] Production preparation stage:

[0046] First, prepare the raw materials for the inner liner 1 according to the design requirements. Then, manufacture the inner liner 1 using a blow molding process and ensure that the dimensional accuracy and surface quality of the inner liner 1 meet the standards. At the same time, prepare the insert thread seat 2, composite connector seat 3, air inlet connector 4, air intake valve 5, water drain valve 6, plug 7, metal drain pipe 10, sealing ring and other components, and check whether their quality and specifications meet the requirements.

[0047] Inner liner 1 and insert threaded seat 2 are assembled:

[0048] The insert threaded seat 2 is installed on both ends of the inner liner 1. The inner surfaces of both ends of the inner liner 1 are positioned and connected to the first annular groove 12, vertical groove 13 and several semi-circular protrusions 14 on the outer surface of the insert threaded seat 2, so as to ensure that the insert threaded seat 2 is firmly fixed on the inner liner 1 and prevent it from falling off or shifting.

[0049] Composite connector 3 installation:

[0050] Install the composite connector seat 3 on the insert thread seat 2, tighten the external thread 18 of the composite connector seat 3 with the internal thread of the insert thread seat 2, and at the same time install the second sealing ring 9 in the second annular groove 19 to ensure the sealing performance of the threaded connection.

[0051] Component installation and sealing:

[0052] Install the air inlet connector 4, air intake valve 5, water drain valve 6, and plug 7 in the corresponding internal threaded holes 17 on the composite connector seat 3, and install sealing rings at the internal threads of each component to ensure the sealing performance of the air circuit system. Insert the metal drain pipe 10 into the light hole 22 of the composite connector seat 3 and weld it to ensure reliable welding quality and prevent water or air leakage.

[0053] Fiber-resin composite winding:

[0054] A fiber-resin composite winding layer 11 is wound around the outer surface of the inner liner 1. First, axial winding is performed, and then radial winding is performed to ensure the uniformity and continuity of the winding layer. The fiber is tightly bonded to the inner liner 1 through resin impregnation, thereby enhancing the strength and pressure resistance of the inner liner 1.

[0055] Processing and testing:

[0056] The ends of the gas storage cylinder are machined by turning the outer diameter and milling the surface to ensure the dimensional accuracy and surface quality of the ends, which facilitates the installation of the composite connector seat 3 and the control of the compression of the sealing ring. Then, pressure tests, sealing tests and other inspection items are carried out on the gas storage cylinder to ensure that the performance of the gas storage cylinder meets the design requirements.

[0057] Usage and maintenance:

[0058] During use, compressed gas is introduced into the air tank through the air inlet connector 4 as needed, and the gas is taken out through the air outlet valve 5 for use. The water accumulated in the inner tank 1 is drained periodically through the water outlet valve 6. The connection and sealing performance of each component are checked. If there are any problems, the components are repaired or replaced in time to ensure the safe and reliable operation of the air tank.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite material gas storage cylinder, comprising an inner liner (1), characterized in that: The inner liner (1) is equipped with insert threaded seats (2) on both sides. Each insert threaded seat (2) is equipped with a composite connector seat (3). Each composite connector seat (3) is equipped with an air inlet connector (4), an air intake valve (5), a water drain valve (6), a plug (7), a first sealing ring (8), and a second sealing ring (9). One of the composite connector seats (3) is connected to a metal drain pipe (10), and the outer layer of the inner liner (1) is provided with a fiber resin composite winding layer (11).

2. The composite material gas storage cylinder according to claim 1, characterized in that: The end of the metal drain pipe (10) extends to the bottom of the inner liner (1). The fiber resin composite winding layer (11) is composed of an axial winding layer and a radial winding layer. The material of the fiber resin composite winding layer (11) is a resin substrate and continuous fibers.

3. The composite material gas storage cylinder according to claim 2, characterized in that: The inner liner (1) is integrally formed by blow molding, and the material of the inner liner (1) is nylon and polyethylene; The inner surfaces of both ends of the inner liner (1) and the outer surfaces of the insert thread seat (2) are provided with a first annular groove (12), a vertical groove (13) and several semi-circular protrusions (14). The first annular groove (12), the vertical groove (13) and the several semi-circular protrusions (14) on the inner surfaces of both ends of the inner liner (1) and the outer surfaces of the insert thread seat (2) are connected and fitted together, thereby fixing the insert thread seat (2) and preventing the insert thread seat (2) from falling off and shifting.

4. The composite material gas storage cylinder according to claim 3, characterized in that: The outer surface of the inner liner (1) is provided with a plurality of radially evenly distributed grooves (15), which are used to increase the adhesion between the winding layer and the inner liner (1); After the inner liner (1) is formed, its end needs to be machined with an outer circle and milled with a flat surface to facilitate the installation of the composite connector seat (3) and control the compression of the first sealing ring (8) and the second sealing ring (9).

5. The composite material gas storage cylinder according to claim 4, characterized in that: The insert threaded seat (2) has a threaded body (16) inside, which is used to install the composite connector seat (3).

6. The composite material gas storage cylinder according to claim 5, characterized in that: The composite connector seat (3) is provided with a plurality of internal threaded holes (17), which are used to install an air inlet connector (4), an air outlet connector, a drain valve (6) and a plug (7). The outer side of the plurality of internal threaded holes (17) is provided with an external thread (18), which is used to connect to the insert threaded seat (2). The adjacent surface of the external thread (18) is provided with a second annular groove (19), which is used to install a second sealing ring (9). The composite connector seat (3) is provided with two third annular grooves (20), which are used to install the first sealing ring (8). The outer side wall of the composite connector seat (3) is provided with several symmetrical clamping surfaces (21), which are used to tighten by a wrench. One of the internal thread holes (17) is a smooth hole (22), which is used for inserting a metal drain pipe (10). The metal drain pipe (10) and the composite connector seat (3) are welded together.

7. The composite material gas storage cylinder according to claim 6, characterized in that: The first sealing ring (8) is in compression contact with the inner liner (1) and the composite connector seat (3) to achieve a seal, and the second sealing ring (9) is in compression contact with the threaded seat and the composite connector seat (3) to achieve an auxiliary seal.

8. The composite material gas storage cylinder according to claim 7, characterized in that: The metal drain pipe (10) is made of the same material as the composite connector seat (3), which facilitates welding. The metal drain pipe (10) is L-shaped or Z-shaped. The internal threads of the air inlet connector (4), air outlet connector, water drain valve (6), and plug (7) are all equipped with sealing rings, and the composite connector seat (3) is in contact with the seal.

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