Composite gas cylinder

Abstract

The application discloses a composite gas storage cylinder, which comprises an inner container, a connecting part and a pipeline adapter part; the inner container comprises a cylinder body, a crown-shaped head and a cylinder mouth, a fluid inlet and outlet are arranged at the vertex of at least one head; the connecting part is welded with the inner container at the fluid inlet and outlet and is connected with the inner container and the pipeline adapter part respectively; the pipeline adapter part comprises a gas passage and a drainage passage; the inner container is covered with a fiber winding layer. The application has compact structure, light weight, reliable overall strength and effective sealing.

Description

Technical Field

[0001] This invention relates to gas storage cylinder technology, and particularly to a composite material gas storage cylinder. Background Technology

[0002] Air cylinders are common air storage components in vehicles and other equipment, used to store compressed air produced by air compressors. This compressed air is used in automotive systems such as braking and horn operation. Traditional air cylinders are mostly made of metal materials, such as steel or aluminum alloy. The former has a high material density, which does not conform to the trend of lightweighting in automobiles, and the interior requires surface anti-rust treatment; the latter has a complex molding process and high manufacturing cost, and its material density is still slightly higher than that of non-metallic materials. At the same time, air cylinders made of metal materials need to be equipped with multiple pipeline interfaces for air inlet, air outlet, sewage discharge, and water discharge, which increases the possibility of leakage of high-pressure media due to the complex structure and multiple outlets.

[0003] In recent years, composite gas cylinders have emerged, which adopt a fiber-wound molding process. Generally, they consist of an inner liner and a winding layer. The inner liner is made of plastic, and the winding layer consists of fibers and impregnated resin. The fiber material can be reinforced materials such as glass fiber, aramid fiber, and carbon fiber. The impregnating resin can be epoxy resin, modified epoxy resin, or unsaturated resin system with added curing agents and accelerators. After being impregnated with resin, the fibers are wound and cured on the surface of the inner liner according to a certain winding pattern.

[0004] For example, Chinese utility model patent CN 209386002 U, authorized on September 13, 2019, discloses a composite material gas cylinder. This composite material gas cylinder includes end caps, a cylinder body, and pipe joints. Two end caps are symmetrically installed on both sides of the cylinder body by welding. Four pipe joints are fixedly installed on one side of each of the two end caps. A winding layer is also fixedly installed on the outer side of the end caps and the cylinder body. The winding layer is glass fiber impregnated with thermosetting resin, which is cured and bonded to the cylinder body by thermosetting resin. The curing method is thermosetting, with a heating temperature of 130-170℃ and a holding time of 10-50 minutes. Although this structure achieves a lightweight gas cylinder, welding multiple joints on the inner liner increases the possibility of leakage and makes winding long filament fibers more difficult.

[0005] Gas cylinders store compressed air for extended periods, and due to the high pressure, a certain amount of water will accumulate inside. This water needs to be drained promptly, otherwise it will affect equipment safety. However, the drain pipe connector of existing gas cylinders is located at the bottom of the cylinder body, interfering with the outer winding route. This means that the fiber layer can only be wound around the cylinder body and cannot be wound around the end caps on both sides. As a result, the strength of the end caps cannot be guaranteed, and the connection between the end caps and the cylinder body will also be weak. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a composite material gas storage cylinder that is compact in structure, lightweight, and achieves effective sealing while having more reliable overall strength.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] A composite material gas cylinder includes an inner liner, which includes a crown-shaped end cap and a fluid inlet / outlet. A fluid inlet / outlet is provided at the apex of at least one end cap. One end of a connecting part is connected to the inner liner at the fluid inlet / outlet, and the other end is connected to a pipeline adapter. The pipeline adapter includes an inward gas passage and a drain pipe. The drain pipe passes through the fluid inlet / outlet and extends to the bottom of the inner liner. The inner liner is covered with a fiber winding layer.

[0009] Preferably, the connecting part includes a metal insert, which is wrapped in plastic, and the wrapped plastic is welded to the inner liner.

[0010] Preferably, the pipeline junction is provided with at least one outward gas passage, the outward gas passage and the inward gas passage are connected inside the pipeline junction, and the inward gas passage is connected to the fluid inlet and outlet.

[0011] Preferably, the pipeline junction includes a connecting post, in which the drain pipe and the inward gas passage are arranged in parallel and separate from each other.

[0012] Preferably, the pipeline junction includes a connecting post, and the drain pipe is sleeved in the inward gas passage within the connecting post.

[0013] Preferably, the inward gas passage includes a first inward gas passage and a second inward gas passage, the drain pipe is sleeved in the first inward gas passage, the second inward gas passage is connected to the gas passage transfer pipe, and the side of the gas passage transfer pipe is connected to at least one branch pipe.

[0014] Preferably, the drain pipe is arranged in parallel with the first inward gas passage, which are separate from each other.

[0015] Preferably, it also includes a pipeline adapter II, which is provided with an inward gas passage and / or a drain pipe. A fluid inlet and outlet are provided at the apex of each of the two end caps of the inner liner. The inner liner is connected to two connecting parts through the two fluid inlets and outlets, one of which is connected to the pipeline adapter II and the other is connected to the pipeline adapter II.

[0016] Preferably, it also includes a protective cover, which is a shell structure that is tightly fitted onto the side surface of the fiber winding layer, and a short tubular sleeve is provided on the protective cover.

[0017] Preferably, the drain pipe is connected to the drain cavity, the drain cavity is connected to the drain extension pipe, and the drain extension pipe is connected to the drain valve or differential pressure drain device.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The composite material gas cylinder of this invention employs a connecting part welded to the inner liner at the cylinder mouth. This connecting part is connected to both the cylinder mouth and the pipeline transition part, creating a continuous sealed space between the connecting part and the pipeline transition part inside the inner liner. Only one fluid inlet / outlet is provided on the inner liner, with the connecting part connecting to both the inner liner and the pipeline transition part. An inward gas passage passes through the connecting part to reach the cylinder mouth and connect to the fluid inlet / outlet. A drain pipe extends from the fluid inlet / outlet through the cylinder mouth to the bottom of the inner liner. This design achieves gas inlet, outlet, and drainage while reducing the number of openings in the inner liner, resulting in a compact structure. This allows the fiber winding layer to cover more of the end cap surface, improving the gas cylinder's sealing performance and reducing the risk of leakage. Simultaneously, the larger area covered by the fiber winding layer on the gas cylinder body enhances the overall strength of the gas cylinder body. Attached Figure Description

[0020] Figure 1 This is an exploded view of Embodiment 1 of the present invention;

[0021] Figure 2 This is a longitudinal sectional view of Embodiment 1 of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0023] Figure 4 This is an exploded view of the pipeline junction in Embodiment 1 of the present invention;

[0024] Figure 5 This is a perspective view of the protective cover in Embodiment 1 of the present invention from one angle;

[0025] Figure 6 This is a cross-sectional view of the pipeline junction in Embodiment 2 of the present invention;

[0026] Figure 7 This is an exploded view of the pipeline junction in Embodiment 3 of the present invention;

[0027] Figure 8 This is a cross-sectional view of the pipeline junction in Embodiment 3 of the present invention;

[0028] Figure 9 This is a cross-sectional view of Embodiment 4 of the present invention.

[0029] In the picture:

[0030] 1-Gas cylinder body, 11-Cylinder body, 12-End cap, 13-Cylinder mouth, 131-Fluid inlet / outlet, 14-Inner liner, 141-Shoulder liner, 15-Fiber winding layer;

[0031] 2-Connecting part, 21-Metal insert, 211-Metal sealing base, 212-Mounting part, 213-Disc, 22-Shoulder, 221-Plastic sealing base, 23-Bottle neck receiving part, 24-Sealing ring;

[0032] 3-Pipeline adapter, 31-Drain pipe, 32-Drain cavity, 33-Drain extension pipe, 34-Inward gas passage, 341-First inward gas passage, 342-Second inward gas passage, 35-Outward gas passage, 36-Gas extension pipe, 37-Connecting column, 38-Gas adapter pipe, 39-Branch pipe;

[0033] 3′-Pipeline Adapter II;

[0034] 4-Protective cover, 41-Sleeve, 42-Reinforcing rib. Detailed Implementation

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The composite material gas cylinder provided by this invention is used to store compressed air generated by an air compressor in a vehicle. The compressed air is used in vehicle braking, horn, and other systems. It includes a gas cylinder body 1, a connecting part 2, and a pipeline adapter 3. The inner layer of the gas cylinder body 1 is a plastic liner 14, which includes a body 11, a cap 12, and a mouth 13. The liner 14 can be integrally formed by processes such as blow molding or rotational molding, or it can be formed by welding two symmetrical plastic parts together.

[0037] The inner liner 14 is connected to the connecting part 2 via the bottle opening 13. The connecting part 2 is connected to the pipeline adapter 3, which includes a gas passage and a drainage passage. The inner liner 14 is used to store compressed air and includes a crown-shaped end cap 12, with a bottle opening 13 located at at least one apex of the end cap 12. The connecting part 2 achieves a sealed connection between the inner liner 14 and the pipeline adapter 3.

[0038] The gas cylinder body 1 is covered with a fiber winding layer 15. The fiber winding layer 15 is formed by impregnating long filaments with resin. The resin can be a thermosetting resin or a thermoplastic resin. After the thermosetting resin is cured at an appropriate temperature, it forms a high-strength fiber winding layer 15 with the long filaments, which can withstand the pressure of compressed air and prevent the gas cylinder from becoming unstable and deforming, thus preventing it from bursting. Thermosetting resins can be epoxy resin, vinyl ester resin, or polyurethane resin. Thermoplastic resins can be polyetheretherketone (PEEK), polyphenylene sulfate (PPS), polyetherimide (PEI), polyethersulfone (PES), polyamide (PA), polyamide-imide (PAI), polyimide (PI), etc. The long filaments can be one or more of glass fiber, carbon fiber, aramid fiber, or basalt fiber. The plastic, resin, and long filament fibers have a lower specific gravity than steel or aluminum, reducing the weight of the gas cylinder and achieving lightweighting in vehicles. The plastic inner liner 14 is corrosion-resistant and will not rust when in contact with water, which is superior to gas cylinders made of metal materials such as steel or aluminum.

[0039] Example 1

[0040] like Figure 1 , 2 As shown, the inner liner 14 includes a cylindrical bottle body 11 and two crown-shaped caps 12. The two caps 12 are disposed opposite to each other at both ends of the bottle body 11, and the arc surface of the caps 12 protrudes outward from the bottle body 11.

[0041] like Figure 3 As shown, a bottle neck 13 is provided at the apex of one of the end caps 12. The bottle neck 13 is a frustum or cylinder with a through hollow structure, which serves as a fluid inlet / outlet 131. The fluid inlet / outlet 131 is also frustum or cylinder, serving as a channel for compressed gas to enter and exit the inner liner 14, and communicating with the internal space of the inner liner 14. The fluid inlet / outlet 131 is coaxial with the bottle neck 13, and the bottle neck 13 is coaxial with the inner liner 14. A shoulder receiving portion 141 is provided at the root of the bottle neck 13, recessed into the inner liner 14. The shoulder receiving portion 141 is integrally formed with the inner liner 14 and is used for fitting and connecting with the connecting portion 2. The cross-section of the shoulder receiving portion 141 is circular and coaxial with the inner liner 14.

[0042] The connecting part 2 connects the inner liner 14 to the pipe adapter 3. The connecting part 2 is a composite structure, including a metal insert 21 for increased structural strength, the surface of which is covered with plastic. The connecting part 2 is generally manufactured by injection molding, but can also be manufactured using other plastic molding processes, such as 3D printing. One end of the metal insert 21 has a short tubular mounting part 212 for connecting to the pipe adapter 3. The inner wall of the mounting part 212 is threaded for connection with the pipe adapter 3. At the end of the thread, there is also a metal sealing bearing 211 protruding towards the axis of the inner liner 14. The other end of the metal insert 21 is a disc 213, which extends radially along the mounting part 212 and is coaxial with it. The mounting part 212 and the disc 213 can be integrally machined or welded together as two separate components. Compared to the threaded portion, the disc 213 is closer to the inner liner 14, and the metal sealing base 211 is more specifically located on the inner wall of the mounting portion 212 between the thread and the disc 213. Starting from the end of the thread, the plastic continuously covers at least three portions: the metal sealing base 211, the remaining inner wall of the mounting portion 212 excluding the thread, and the surface of the disc 213 on one side of the inner liner 14. The plastic covering may extend, or may only cover the surface of the disc 213 on the other side of the inner liner 14, or may continue to cover both the surface of the disc 213 on the other side of the inner liner 14 and the outer wall of the mounting portion 212. After the disc 213 is covered with plastic, it forms a shoulder 22. In particular, the fiber winding layer 15 completely covers one surface of the shoulder 22 away from the inner liner, or only partially covers one surface of the shoulder 22 away from the inner liner. After being covered with plastic, a plastic sealing base 221 is formed on the surface of the metal sealing base 211. A bottle neck receiving portion 23 is formed on the inner wall of the mounting portion 212 between the plastic sealing base 221 and the shoulder 22. A sealing ring 24 is arranged on the surface of the plastic sealing base 221 near the end of the thread for sealing between the pipe transition portion 3 and the connecting portion 2. The bottle neck receiving portion 23 is adapted to fit the bottle neck 13.

[0043] The connecting part 2 and the inner liner 14 are connected by welding. More specifically, the bottle mouth receiving part 23 is welded to the bottle mouth 13, or the shoulder 22 is welded to the shoulder receiving part 141. Alternatively, both the bottle mouth receiving part 23 and the bottle mouth 13 and the shoulder 22 and the shoulder receiving part 141 can be welded together.

[0044] The pipe adapter 3 is threadedly connected to the connecting part 2, enabling communication between the external pipe and the internal space of the inner liner 14. For example... Figure 3 and Figure 4As shown, the pipe adapter 3 is disc-shaped, and its cross-section can be circular, elliptical, or polygonal. The pipe adapter 3 includes a cylindrical connecting post 37 and a gas passage. The connecting post 37 is located on a bottom surface of the pipe adapter 3 near the connecting part 2. The cylindrical surface of the connecting post 37 has external threads, which mate with the internal threads of the mounting part 212. As the connecting post 37 is gradually screwed into the mounting part 212, the end of the connecting post 37 eventually presses against the sealing ring 24 on the plastic sealing base 221, achieving a seal between the pipe adapter 3 and the connecting part 2. The gas passage includes an inward gas passage 34 and at least one outward gas passage 35. An inward gas passage 34 extends through the connecting column 37, passes through the connecting part 2 to the bottle mouth 13, and connects with the fluid inlet / outlet 131. It also connects with the outward gas passage 35 inside the pipe transition part 3, thus enabling one inward gas passage 34 to directly connect with the internal space of the inner liner 14. All other outward gas passages 35 are indirectly connected to the internal space of the inner liner 14 through the inward gas passage 34. Therefore, the pipe transition part 3 converts the outward gas passage 35 into an inward gas passage 34, and this converted inward gas passage 34 connects with the internal space of the inner liner 14. One end of each outward gas passage 35 connects to the inward gas passage 34 inside the pipe transition part 3, and the other end connects to the gas path extension pipe 36.

[0045] The pipe junction 3 is also provided with a drainage passage for draining water accumulated inside the inner liner 14. The drainage passage includes a drainage cavity 32 located within the pipe junction 3 and a drain pipe 131. One end of the drainage cavity 32 extends into the pipe junction 3 and communicates with one end of the drain pipe 31. The other end of the drain pipe 31 passes through the connecting post 37 and the fluid inlet / outlet 131, extending to the bottom of the inner liner 14 and effectively contacting the water accumulation area inside the inner liner 14. Within the connecting post 37, the drain pipe 31 is arranged parallel to and separate from the inward gas passage 34. The other end of the drainage cavity 32 extends outward from the pipe junction 3 and communicates with the drainage extension pipe 33. A drain valve or differential pressure drainage device can be installed on the drainage extension pipe 33.

[0046] Because the outward gas passage 35 is connected to the inward gas passage 34, and the inward gas passage 34 is connected to the internal space of the inner liner 14, the outward gas passage 35, the inward gas passage 34, and the internal space of the inner liner 14 together form a communicating vessel. The compressor can supply compressed air into the communicating vessel through any one of the outward gas passages 35. The compressed air flows to various parts of the vehicle that require it through the other outward gas passages 35, providing the necessary pressure for each part to operate. When the air is compressed, the moisture in the air changes from a gaseous state to a liquid state and remains inside the inner liner 14. Since the inner liner 14 is a closed container, and the moisture is difficult to evaporate, it can affect the normal operation of certain parts of the vehicle and pose a safety hazard. Therefore, it must be drained. To drain the water, the drain valve is opened. When the internal pressure of the inner liner 14 exceeds the standard atmospheric pressure, the residual liquid water inside the inner liner 14 is drained through the drain passage. After draining, the valve is closed. When using the differential pressure drainage device, since the differential pressure drainage device is a one-way valve, when the internal pressure of the inner liner 14 is less than the spring force of the one-way valve after compression and greater than the standard atmospheric pressure, the one-way valve opens, and the residual liquid water in the inner liner 14 is discharged from the drainage passage due to the pressure difference. When the internal pressure of the inner liner 14 is greater than the yield force of the one-way valve spring, the one-way valve closes.

[0047] Bottle neck 13 and shoulder receiving portion 141 are provided on end cap 12 and are integrally formed with end cap 12. End cap 12 is a part of inner liner 14. Inner liner 14 is integrally formed or welded. The plastic welding of inner liner 14 and connecting portion 2 continuously covering metal insert 21 forms a continuous sealing inner surface between connecting portion 2 and inner liner 14, achieving a reliable seal between connecting portion 2 and inner liner 14. Metal insert 21 can withstand the pressure of compressed air in all directions and enhance the mechanical strength of mounting portion 212, thus providing a reliable seal. Sealing ring 24 is arranged on the surface of plastic sealing base 221 near the end of the thread. When connecting post 37 of pipe transition portion 3 is gradually screwed into mounting portion 212, the end of connecting post 37 finally presses the sealing ring 24 on plastic sealing base 221, achieving a reliable seal between pipe transition portion 3 and connecting portion 2. The inner liner 14 and the connecting part 2, and the connecting part 2 and the pipeline transition part 3 are all reliably sealed, thus achieving overall sealing of the gas storage cylinder.

[0048] Only one fluid inlet / outlet 131 is provided on the inner liner 14. The connecting part 2 is connected to the inner liner 14 and the pipeline adapter 3 respectively. The inward gas passage 34 passes through the connecting part 2 to reach the bottle mouth 13 and connects with the fluid inlet / outlet 131. The drain pipe 31 passes through the fluid inlet / outlet 131 of the bottle mouth 13 and extends to the bottom of the inner liner 14. In this way, while realizing the gas inlet, outlet and drain of the gas storage bottle, the number of openings of the gas storage bottle is optimized and reduced, and the risk of leakage is reduced.

[0049] In this embodiment, as Figure 1 and Figure 5A protective cover 4 is also provided outside the pipe adapter 3 to provide protection for the end cap 12 and the pipe adapter 3, restrict the displacement of the pipe adapter 3 relative to the connecting part 2, and reinforce the connection between the pipe adapter 3 and the connecting part 2. The protective cover 4 is a shell structure with an inner cavity that can accommodate the pipe adapter 3, and the protective cover 4 is tightly fitted onto the side surface of the fiber winding layer 15. The protective cover 4 is made of plastic and is integrally molded by injection molding.

[0050] like Figure 2 , Figure 4 and Figure 5 One end of the gas path extension pipe 36 on the pipe adapter 3 is connected to the end of the outward gas passage 35 away from the bottle opening 13, and the other end of the gas path extension pipe 36 passes through the protective cover 4. The drain extension pipe 33 is connected to the end of the drain passage away from the bottle opening 13, and the other end also passes through the protective cover 4. A short tubular sleeve 41 is provided on the outer surface of the protective cover 4. The gas path extension pipe 36 and the drain extension pipe 33 pass through the sleeve 41 and are tightly fitted onto the inner surface of the sleeve 41. A sheet-like reinforcing rib 42 is provided on the outer surface of the sleeve 41. One end of the reinforcing rib 42 is connected to the outer surface of the sleeve 41, and the other end is connected to the outer surface of the protective cover 4, which is used to increase the support for the sleeve 41.

[0051] The protective cover 4 is tightly fitted onto the side surface of the fiber winding layer 15. The pipe adapter 3 is connected to the protective cover 4 through the air extension pipe 36 and the drain extension pipe 33. The connecting post 37 of the pipe adapter 3 is connected to the connecting part 2. Thus, the protective cover 4 fitted onto the side surface of the fiber winding layer 15 can limit the displacement of the pipe adapter 3 relative to the connecting part 2, strengthen the connection between the pipe adapter 3 and the connecting part 2, enhance the seal between the pipe adapter 3 and the connecting part 2, and reduce the risk of leakage.

[0052] Example 2

[0053] This embodiment only provides a different approach to the gas passage and drainage passage in the pipeline adapter 3 compared to Embodiment 1. All other structures are the same as in Embodiment 1, and the same parts will not be described again.

[0054] In this embodiment, a portion of the drainage passage is fitted into a portion of the gas passage. For example... Figure 6Inside the connecting column 37, the drain pipe 31 is fitted into the inward gas passage 34. When the connecting part 2 is threadedly connected to the pipe adapter part 3, the inward gas passage 34 is connected to the fluid inlet / outlet 131, and the drain pipe 31 passes through the fluid inlet / outlet 131 and is connected to the internal space of the inner liner 14. The drain pipe 31 and the inward gas passage 34 form a fitted structure, which saves space and can reduce the volume of the connecting part 2, especially the external dimensions of the mounting part 212. When winding the fiber, a smaller polar hole can be formed at the mounting part 212, increasing the area of ​​the fiber winding layer 15 covering the connecting part 2. The compressed air inside the inner liner 14 applies pressure to the connecting part 2. The fiber winding layer 15 with a smaller polar hole can provide a reaction force for the larger surface of the connecting part 2, thereby better controlling the unstable deformation or even flying out of the connecting part 2, thus providing a more reliable seal and enhancing the overall strength of the gas cylinder body 1.

[0055] Example 3

[0056] This embodiment provides another type of pipe adapter 3, which is different from that in Embodiment 1. All other structures are the same as in Embodiment 1, and the parts that are the same as in Embodiment 1 will not be described again.

[0057] In this embodiment, as Figure 7 and Figure 8 The pipeline junction 3 is also provided with a gas passage, which includes an inward gas passage 34 that communicates with the internal space of the inner liner 14 and at least one outward gas passage 35, with the outward gas passage 35 communicating with the inward gas passage 34.

[0058] The inward gas passage 34 includes a first inward gas passage 341 and a second inward gas passage 342. A drain pipe 31 is fitted inside the first inward gas passage 341. Alternatively, the drain pipe 31 can be parallel to the first inward gas passage 341 and separate from it. The drain pipe 31 connects to a drain extension pipe 33, which is a short pipe and can be fitted with a valve or differential pressure drainage device. The second inward gas passage 342 extends from the side of the main body of the pipe junction 3 towards the center of the main body and connects to the first inward gas passage 341, which runs through the main body of the pipe junction 3 and the connecting column 37. The first inward gas passage 341 connects to the internal space of the inner liner 14. The second inward gas passage 342 connects to a gas transfer pipe 38, which is connected to the main body of the pipe junction 3. The gas transfer pipe 38 is a short pipe and has at least one short tubular branch pipe 39 connected to its side. The inward gas passage 34 is located on the side of the main body of the pipeline junction 3. The gas passage through the branch pipe 39 is the outward gas passage 35.

[0059] In use, since the outward gas passage 35 is connected to the inward gas passage 34, and the inward gas passage 34 is connected to the internal space of the inner liner 14, the outward gas passage 35, the inward gas passage 34, and the internal space of the inner liner 14 together form a communicating vessel. The compressor can supply compressed air into the communicating vessel through any one of the outward gas passages 35. The compressed air flows to various parts of the vehicle that require pressure through the remaining outward gas passages 35, providing the necessary pressure for each part to operate. When drainage is required, it can be drained through a valve or a differential pressure drainage device.

[0060] In this embodiment, the main body of the pipeline adapter 3 is only provided with an inward gas passage 34, and the outward gas passage 35 is provided in the gas transfer pipe 38. The gas transfer pipe 38 can be a standard part. Compared with the pipeline adapter 3 in Embodiment 1, the pipeline adapter 3 provided in this embodiment has a simple structure and is easy to manufacture and process, and has a low cost.

[0061] Example 4

[0062] like Figure 9 The difference between this embodiment and Embodiment 1 is that the composite material gas cylinder provided in this embodiment has a fluid inlet / outlet 131 at the apex of each of the two end caps 12 of the inner liner 14. The inner liner 4 is connected to two connecting parts 2 through the two fluid inlets / outlets 131 respectively. One connecting part 2 is connected to a pipeline adapter 3. One specific structure of the pipeline adapter 3 has been described in Embodiment 1, and another specific structure of the pipeline adapter 3 has been described in Embodiment 2. The other connecting part 2 is connected to a pipeline adapter II 3′. In one case, the pipeline adapter II 3′ is the same as the pipeline adapter 3 described in Embodiment 1. In another case, the pipeline adapter II 3′ is the same as the pipeline adapter 3 described in Embodiment 2. The pipeline adapter 3 described in Embodiments 1 and 2 includes a gas passage and a drainage passage. The gas passage includes an inward gas passage 34, and the drainage passage includes a drain pipe 31. It should be noted that, in another case, the pipe junction II 3' may include an inward gas passage 34 but exclude a drain pipe 31, or it may include a drain pipe 31 but exclude an inward gas passage 34.

[0063] Although various embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that many 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 protection of which is defined by the claims and their equivalents.

Claims

1. A composite material gas storage cylinder, characterized in that: The inner liner (14) includes a crown-shaped end cap (12) and a fluid inlet / outlet (131), with a fluid inlet / outlet (131) located at the apex of at least one end cap (12). One end of a connecting part (2) is connected to the inner liner (14) at the fluid inlet / outlet (131), and the other end is connected to a pipe transition part (3). The pipe transition part (3) includes an inward gas passage (34) and a drain pipe (31). The drain pipe (31) passes through the fluid inlet / outlet (131) and extends to the bottom of the inner liner (14); the inner liner (14) is covered with a fiber winding layer (15); the pipe adapter (3) includes a connecting post (37), in which the drain pipe (31) is fitted into the inward gas passage (34), when the connecting part (2) and the pipe adapter (3) are threadedly connected, the inward gas passage (34) communicates with the fluid inlet / outlet (131), the drain pipe (31) passes through the fluid inlet / outlet (131) and communicates with the internal space of the inner liner (14), the drain pipe (31) and the inward gas passage (34) form a fitted structure; The pipeline junction (3) is provided with at least one outward gas passage (35), the outward gas passage (35) and the inward gas passage (34) are connected inside the pipeline junction (3), the inward gas passage (34) is connected to the fluid inlet and outlet (131); the inward gas passage (34) includes a first inward gas passage (341) and a second inward gas passage (342), the drain pipe (31) is sleeved in the first inward gas passage (341), the second inward gas passage (342) is connected to the gas passage junction pipe (38), and the side of the gas passage junction pipe (38) is connected to at least one branch pipe (39).

2. The composite material gas storage cylinder according to claim 1, characterized in that: The connecting part (2) includes a metal insert (21) which is wrapped in plastic and the plastic is welded to the inner liner (14).

3. The composite material gas storage cylinder according to claim 1, characterized in that: The drain pipe (31) and the first inward gas passage (341) are arranged in parallel to each other.

4. The composite material gas storage cylinder according to any one of claims 1 to 3, characterized in that: It also includes a pipeline adapter II (3'), which is provided with an inward gas passage (34) and / or a drain pipe (31). A fluid inlet and outlet (131) is provided at the apex of each of the two end caps (12) of the inner liner (14). The inner liner (14) is connected to two connecting parts (2) through the two fluid inlets and outlets (131). One connecting part (2) is connected to the pipeline adapter (3), and the other connecting part (2) is connected to the pipeline adapter II (3').

5. The composite material gas storage cylinder according to any one of claims 1 to 3, characterized in that: It also includes a protective cover (4), which is a shell structure that is tightly fitted onto the side surface of the fiber winding layer (15). A short tubular sleeve (41) is provided on the protective cover (4).

6. The composite material gas storage cylinder according to claim 1, characterized in that: The drain pipe (31) is connected to the drain cavity (32), the drain cavity (32) is connected to the drain extension pipe (33), and the drain extension pipe (33) is connected to the drain valve or differential pressure drain device.

Images