Fiber-wound pressure vessel and preparation method thereof

Abstract

The invention provides a fiber winding pressure container and a preparation method, the fiber winding pressure container comprises a container and a composite fiber layer wound on the outer side of the container, the composite fiber layer comprises a radial winding fiber layer and an axial winding fiber layer, and the composite fiber layer further comprises a carbon fiber fabric layer attached to the shoulder of the container; the radial winding fiber layers, the axial winding fiber layers and the carbon fiber fabric layers are alternately arranged, the carbon fiber fabric layers are arranged on any one of the upper side and the lower side of the radial winding fiber layers, and the edge parts of the carbon fiber fabric layers are overlapped with the edge parts of the radial winding fiber layers. By arranging the carbon fiber fabric layer, the part, most prone to deformation, of the container is reinforced, and compared with a traditional winding process, the number of winding layers of axial winding fiber layers can be reduced, fiber materials are saved, the time consumed by the winding process is shortened, and the production benefits of products are greatly improved; the carbon fiber fabric layer and the radial winding fiber layer are overlapped, so that the connecting part can provide strength support for the carbon fiber material.

Description

Technical Field

[0001] The invention relates to a filament winding pressure vessel and a preparation method thereof, belonging to the technical field of gas vessel manufacturing. Background Art

[0002] Pressure vessels are a medium for storing and transporting gas or liquid, and are widely used in industries such as petroleum, chemical industry, medicine, aerospace, rail transportation, and automobiles. However, traditional metal containers have defects such as heavy weight, easy corrosion, and susceptibility to external forces. Therefore, non-metallic liner fully wound pressure vessels have become a research hotspot for pressure vessels, and have attracted much attention for their superior performance and wide range of applications.

[0003] The winding process is the core technology for manufacturing non-metallic liner fully wound pressure vessels. This process uses fiber materials (such as carbon fiber, glass fiber, etc.) to wind around the surface of the liner, and then adheres them with resin-based glue to form the final shape. This process has the advantages of simple manufacturing, light weight, and corrosion resistance, and is very suitable for manufacturing high-strength, lightweight pressure vessels.

[0004] However, the fully wound pressure vessels currently have product deformation caused by the size change of the inner liner. The interface of the non-metallic wound pressure vessel is elliptical, the shoulder is the thinnest and has the lowest strength, and is prone to cracks and size shrinkage. It depends on the design of the layers and the increase in the number of winding layers to meet the use requirements. There will be some strength redundancy in the use of materials, resulting in material waste and increased production costs.

[0005] The existing Chinese published application CN115401817A discloses a composite IV-type gas cylinder with a partially reinforced plastic liner and a preparation method thereof. The application discloses a technical solution including "activating a specific part of the plastic liner, and then laying a reinforcing sheet on the part to obtain a reinforced plastic liner... The reinforcing sheet is a carbon fiber reinforced epoxy prepreg, and its shape is at least one of a parallelogram, a triangle, and a trapezoid." The application discloses using the reinforcing sheet as a shoulder reinforcement structure to strengthen the relatively weak shoulder structure of the liner, which is similar to the early plastic basin or bucket. In the common patching method of the period, the surface of the liner is softened by flame spraying, that is, activation, and then the reinforcing sheet is attached to the activated area. This method is firstly destructive to the structure of the liner. Secondly, the shape structure of the reinforcing sheet disclosed in the application cannot be closely arranged adjacent to each other under the premise that the shoulder of the bottle body is an arc surface. The adjacent arrangement cannot fully cover the entire shoulder arc surface, and partial overlap is required to fully cover it. In addition, the stacked reinforcing sheets are independent of each other and cannot bear stress, which will cause partial bulges during winding and uneven strength distribution.

[0006] Therefore, there is a need for a pressure vessel and a preparation method thereof that can increase the strength of the shoulder of the bottle body without destroying the structure of the bottle body itself, reduce the number of wound fibers, and reduce the production cost. Summary of the invention

[0007] Purpose of the invention: In view of the deficiencies in the prior art, the present invention provides a fiber-wound pressure vessel and a preparation method thereof, which locally strengthens the weak area of ​​the shoulder of the container by reinforcing it with carbon fiber fabric. Compared with the traditional winding hierarchy and method, the fiber amount required for container winding is saved and the expected effect can be achieved, thereby reducing the weight of the container, reducing the fiber material, reducing the production time, and improving the production efficiency and the service life of the container.

[0008] Technical solution: A fiber-wound pressure vessel, comprising a container and a composite fiber layer wound on the outside of the container, the composite fiber layer comprising a radially wound fiber layer and an axially wound fiber layer, the radially wound fiber layer being wound on a straight section of the container, the axially wound fiber layer being wound on a portion including the straight section of the container and a shoulder of the container, the composite fiber layer also comprising a carbon fiber fabric layer attached to the shoulder of the container, the radially wound fiber layers, the axially wound fiber layers and the carbon fiber fabric layers being arranged alternately and each being provided with at least one layer, the carbon fiber fabric layer being arranged on either side of the radially wound fiber layer above or below and the edge portion of the carbon fiber fabric layer being overlapped with the edge portion of the radially wound fiber layer.

[0009] The present invention arranges a carbon fiber fabric layer, and adheres it to the shoulder of the container with an adhesive during the fiber winding process, so as to reinforce the part of the container that is most prone to deformation. Compared with the traditional winding process, the number of winding layers of the axially wound fiber layer can be reduced, the use of fiber materials can be saved, the time consumed in the winding process can be reduced, and the production efficiency of the product is greatly improved; the carbon fiber fabric layer overlaps with the radially wound fiber layer, so that the connecting part can provide strength support of the carbon fiber material rather than the strength of the adhesive. At the same time, because the radially wound fiber layer is wound on the straight section of the container, the overlap of the carbon fiber fabric layer can simultaneously strengthen the shoulder and the straight section of the container.

[0010] The radially wound fiber layer is provided with at least two layers, including a first radially wound fiber layer and a second radially wound fiber layer; The axially wound fiber layer is provided with at least two layers, including a first axially wound fiber layer and a second axially wound fiber layer; The carbon fiber fabric layer is provided to be at least two layers, including a first carbon fiber fabric layer and a second carbon fiber fabric layer; The first carbon fiber fabric layer covers the container shoulder and overlaps with the edge portion of the first radially wound fiber layer; the second carbon fiber fabric layer covers the container shoulder and overlaps with the edge portion of the second radially wound fiber layer.

[0011] When the container requires a higher strength, multiple layers of winding are required to form a composite fiber layer with higher strength. The layers in the present invention represent adjacent winding layers in the winding process. If the winding method is the same, they are combined and regarded as a whole fiber layer. 2 layers refer to 2 whole fiber layers of the same winding method separated by other winding methods. When manufacturing containers that require multi-layer fiber winding, the winding work is repeated according to the initial winding order until the winding thickness required for the container is reached.

[0012] The first carbon fiber fabric layer and the second carbon fiber fabric layer, when unfolded, form at least one fan-shaped structure with an opening, the size of the opening varies according to the size of the container shoulder, and after being attached to the container shoulder, the edges of the opening overlap each other to form an arc surface that covers the entire container shoulder, and the width of the overlapping part is 4 mm to 6 mm.

[0013] The fan-shaped structure fits the curved surface of the container shoulder better, and the opening is overlapped when fitted, so that the opening has the strength support provided by the carbon fiber fabric material. At the same time, the carbon fiber fabric has good flexibility. After the outer fiber layer is wound, the overlapping part will be pressed and will not bulge, which ensures the overlap strength of the opening without affecting the overall fiber winding process of the container.

[0014] Any of the carbon fiber fabric layers comprises two pieces of assembled and spliced ​​carbon fiber fabric monomers, and the width of the overlapped openings and edges of the two pieces of carbon fiber fabric monomers is 4 mm to 6 mm.

[0015] In order to make the processing more convenient, the carbon fiber fabric layer is set to be two carbon fiber fabric monomers spliced ​​together to form a complete curved surface. During the bonding operation, it can be bonded faster. Compared with a single piece of carbon fiber fabric layer, the combination of two pieces is less likely to have wrinkles, and the edges are also overlapped to ensure the strength of the connection.

[0016] The unfolded area of ​​the second carbon fiber fabric layer is larger than the unfolded area of ​​the first carbon fiber fabric layer. After installation, the second carbon fiber fabric layer covers the overlapped portion between the first carbon fiber fabric layer and the container shoulder and the first radially wound fiber layer.

[0017] When attaching the second carbon fiber fabric layer, the outer second carbon fiber fabric layer covers the edge of the adjacent inner first carbon fiber fabric layer, so that the inner first carbon fiber fabric layer has higher strength and the overlap at the edge is more stable.

[0018] The overlapping length of the first carbon fiber fabric layer and the first radially wound fiber layer is 40 mm to 60 mm.

[0019] In order to ensure the effectiveness of the overlap between the innermost first carbon fiber fabric layer and the first radially wound fiber layer, the overlap length is at least 40 mm to achieve stability after the overlap and still provide good strength after long-term use.

[0020] After bonding, the adjacent openings of the first carbon fiber fabric layer and the second carbon fiber fabric layer are spaced apart, and the spacing distance is greater than or equal to 20 mm.

[0021] Although the openings of the carbon fiber fabric layers overlap and have sufficient strength, the strength of the overlapping parts is relatively weak compared to the integrated parts. Therefore, in the bonding operation of the outer carbon fiber fabric layer, the openings of the outer layer and the inner layer should be staggered and spaced a certain distance apart to ensure that the relatively weak areas will not overlap, further improving the strength of the container and the shoulder reinforcement effect.

[0022] The distance between the edge of the first carbon fiber fabric layer and the second carbon fiber fabric layer close to the bottle mouth and the edge of the hole on the shoulder of the container is 25 mm to 45 mm.

[0023] The edge of the polar hole on the shoulder of the container is the intersection part during the axial winding process. The fibers stacked in this part are numerous and thick. Therefore, when bonding the carbon fiber fabric layer, in order to avoid wrinkles, it is necessary to avoid the polar hole part of the bottle mouth by a certain distance, which not only ensures the strength of the shoulder of the container, but also reduces the possibility of wrinkles.

[0024] A method for preparing a filament-wound pressure vessel, characterized in that it comprises the following steps: Step 1: Material preparation; Step 1.1 Preparation of carbon fiber fabric layer: According to the diameter and length of the container to be processed and the curvature of the container shoulder, a fan-shaped or annular carbon fiber fabric of corresponding size is selected. The carbon fiber fabric is formed by cross-weaving carbon fibers horizontally and vertically, and an opening is opened from the outer circle to the inner circle; Step 1.2: Resin material selection: select bisphenol A epoxy resin and amine curing agent, mix the two materials, and set the viscosity to 200~500mPa·s; Step 2: Container making; HDPE material is selected as the container material, the HDPE material is heated to a molten state, extruded into a cylindrical substrate by an extrusion device and enters into a blow molding mold, and blow molding is performed by a blow molding process; Step 3: Winding of composite fiber layers; According to product requirements, test experiments are carried out to obtain the winding thickness of the composite fiber layer, and the fiber winding process is carried out by reinforcing the container shoulder; the container is inflated during the winding process, and the inflation pressure value is 0.05~1mPa; Step 4: Curing and molding; Step 4.1: Curing at room temperature, fix the wrapped container and keep it in a rotating state for 6 hours; Step 4.2: Post-curing: cure in a curing oven at 50°C for 2h.

[0025] The step 3 is specifically as follows: Fix the container to be wrapped on the rotating equipment, pre-fill the container with air, and create a pressure environment inside the container; Perform fiber winding, and select any one of the axially wound fiber layer, the radially wound fiber layer, and the carbon fiber fabric layer for operation; and then perform the operation on the remaining two fiber layers; During the winding process, the fiber is first immersed in a solvent mixed with bisphenol A epoxy resin and amine curing agent before being wound around the container, so that the mixed solvent adheres to the fiber surface; the carbon fiber fabric layer is attached and fixed by applying the mixed solvent between the carbon fiber fabric layer and the shoulder of the container; The same winding sequence is repeated until the winding thickness reaches a predetermined winding thickness.

[0026] Beneficial effects: The present invention arranges a carbon fiber fabric layer and adheres it to the shoulder of the container with an adhesive during the fiber winding process, so as to reinforce the part of the container that is most prone to deformation. Compared with the traditional winding process, the number of winding layers of the axially wound fiber layer can be reduced, the use of fiber materials can be saved, the time consumed in the winding process can be reduced, and the production efficiency of the product can be greatly improved; the carbon fiber fabric layer overlaps with the radially wound fiber layer, so that the connecting part can provide strength support of the carbon fiber material rather than the strength of the adhesive. At the same time, because the radially wound fiber layer is wound on the straight section of the container, the overlap of the carbon fiber fabric layer can simultaneously strengthen the shoulder and the straight section of the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the present invention after attaching a carbon fiber fabric layer.

[0029] Figure 2 It is a schematic diagram of the fiber layers after multi-layer winding of the present invention.

[0030] Figure 3 It is a structural diagram of the carbon fiber fabric monomer of the present invention.

[0031] Figure 4 It is the overall structure diagram of the container of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figure 1 and 2 As shown, a fiber-wound pressure vessel comprises a container 1 and a composite fiber layer 2 wound on the outside of the container 1, wherein the composite fiber layer 2 comprises a radially wound fiber layer 21 and an axially wound fiber layer 22, wherein the radially wound fiber layer 21 is wound on a straight section of the container 1, and the axially wound fiber layer 22 is wound on a portion including the straight section of the container 1 and a shoulder of the container 1, wherein the composite fiber layer 2 further comprises a carbon fiber fabric layer 23 attached to the shoulder of the container 1, wherein the radially wound fiber layer 21, the axially wound fiber layer 22 and the carbon fiber fabric layer 23 are alternately arranged and each of them is provided with at least one layer, wherein the carbon fiber fabric layer 23 is arranged on either side of the radially wound fiber layer 21, and an edge portion of the carbon fiber fabric layer 23 overlaps with an edge portion of the radially wound fiber layer 21.

[0036] The present invention provides a carbon fiber fabric layer 23, which is adhered to the shoulder of the container 1 with an adhesive during the fiber winding process, so as to reinforce the part of the container 1 that is most prone to deformation. Compared with the traditional winding process, the number of winding layers of the axially wound fiber layer 22 can be reduced, the use of fiber materials can be saved, the time consumed in the winding process can be reduced, and the production efficiency of the product can be greatly improved; the carbon fiber fabric layer 23 overlaps with the radially wound fiber layer 21, so that the connecting part can provide strength support of the carbon fiber material rather than the strength of the adhesive. At the same time, since the radially wound fiber layer 21 is wound on the straight section of the container 1, the overlap of the carbon fiber fabric layer 23 can simultaneously strengthen the shoulder and the straight section of the container 1.

[0037] The radially wound fiber layer 21 is provided with two layers, including a first radially wound fiber layer 211 and a second radially wound fiber layer 212; The axially wound fiber layer 22 is provided with two layers, including a first axially wound fiber layer 221 and a second axially wound fiber layer 222; The carbon fiber fabric layer 23 is provided with two layers, including a first carbon fiber fabric layer 231 and a second carbon fiber fabric layer 232; The first carbon fiber fabric layer 231 covers the shoulder of the container 1 and overlaps with the edge portion of the first radially wound fiber layer 211 ; the second carbon fiber fabric layer 232 covers the shoulder of the container 1 and overlaps with the edge portion of the second radially wound fiber layer 212 .

[0038] When the container 1 requires a higher strength, multiple layers of winding are required to form a composite fiber layer 2 with higher strength. The layers in the present invention represent adjacent winding layers in the winding process. If the winding method is the same, they are combined and regarded as a whole fiber layer. 2 layers refer to two whole fiber layers of the same winding method separated by other winding methods. When manufacturing a container 1 that requires multiple layers of fiber winding, the winding work is repeated according to the initial winding order until the winding thickness required for the container 1 is reached.

[0039] In this embodiment, each complete fiber layer includes two fiber layers wound in the same winding manner, and the carbon fiber fabric layer 23 is only a single-layer structure. In this embodiment, the two carbon fiber fabric layers are represented as two single-layer structures separated by two fiber layers of other winding methods.

[0040] like Figure 3 As shown, the first carbon fiber fabric layer 231 and the second carbon fiber fabric layer 232 are at least one fan-shaped structure with an opening after being unfolded, and the size of the opening varies according to the size of the shoulder of the container 1. After being attached to the shoulder of the container 1, the edges of the opening overlap each other to form an arc surface to cover the entire shoulder of the container 1, and the width of the overlapping part is 5 mm.

[0041] The fan-shaped structure fits the curved surface of the shoulder of the container 1 more closely, and the opening is overlapped when fitted, so that the opening has the strength support provided by the carbon fiber fabric material. At the same time, the carbon fiber fabric has good flexibility. After the outer fiber layer is wound, the overlapping part will be pressed and will not bulge, thereby ensuring the overlap strength of the opening without affecting the overall fiber winding process of the container 1.

[0042] Any of the carbon fiber fabric layers 23 comprises two pieces of carbon fiber fabric monomers 233 that are combined and spliced ​​together, and the width of the overlapped openings and edges of the two pieces of carbon fiber fabric monomers 233 is 5 mm.

[0043] In order to make the processing more convenient, the carbon fiber fabric layer 23 is set to be two carbon fiber fabric monomers 233 spliced ​​together to form a complete arc surface. During the bonding operation, it can be bonded faster. Compared with a single piece of carbon fiber fabric layer 23, the probability of wrinkles in the combination of two pieces is smaller, and the edges are also overlapped to ensure the strength of the connection.

[0044] The unfolded area of ​​the second carbon fiber fabric layer 232 is larger than the unfolded area of ​​the first carbon fiber fabric layer 231 . After installation, the second carbon fiber fabric layer 232 covers the overlapped portion between the first carbon fiber fabric layer 231 and the shoulder of the container 1 and the first radially wound fiber layer 211 .

[0045] When attaching the second carbon fiber fabric layer 23, the outer second carbon fiber fabric layer 232 covers the edge of the adjacent inner first carbon fiber fabric layer 231, so that the inner first carbon fiber fabric layer 231 has higher strength and the overlap at the edge is more stable.

[0046] The overlapping length of the first carbon fiber fabric layer 231 and the first radially wound fiber layer 211 is 50 mm.

[0047] In order to ensure the effectiveness of the overlap between the innermost first carbon fiber fabric layer 231 and the first radially wound fiber layer 211, the overlapping length of 50 mm can achieve stability after the overlap and still provide good strength after long-term use, thereby improving the service life of the product.

[0048] After bonding, the first carbon fiber fabric layer 231 and the second carbon fiber fabric layer 232 are spaced apart at adjacent openings, and the spacing distance is 20 mm.

[0049] Although the openings of the carbon fiber fabric layer 23 overlap and have sufficient strength, the strength of the overlapping parts is relatively weak compared to the integrated parts. Therefore, in the bonding operation of the outer carbon fiber fabric layer 23, the openings of the outer layer and the openings of the inner layer should be staggered and spaced a certain distance apart to ensure that relatively weak areas will not overlap, thereby further improving the strength of the container 1 and the shoulder reinforcement effect.

[0050] like Figure 1 and 4 As shown, the distance between the edge of the first carbon fiber fabric layer 231 and the second carbon fiber fabric layer 232 close to the bottle mouth and the edge of the shoulder hole of the container 1 is 40 mm.

[0051] The edge of the pole hole on the shoulder of the container 1 is the intersection part during the axial winding process. The fibers stacked in this part are numerous and thick. Therefore, when bonding the carbon fiber fabric layer 23, in order to avoid wrinkles, it is necessary to avoid the pole hole part of the bottle mouth by a certain distance, which not only ensures the strength of the shoulder of the container 1, but also reduces the possibility of wrinkles.

[0052] A method for preparing a filament-wound pressure vessel comprises the following steps: Step 1: Material preparation; Step 1.1 Preparation of carbon fiber fabric layer: According to the diameter and length of the container to be processed and the curvature of the container shoulder, a fan-shaped or annular carbon fiber fabric of corresponding size is selected. The carbon fiber fabric is formed by cross-weaving carbon fibers horizontally and vertically, and an opening is opened from the outer circle to the inner circle; Step 1.2: Resin material selection: select bisphenol A epoxy resin and amine curing agent, mix the two materials, and set the viscosity to 200~500mPa·s; Step 2: Container making; HDPE material is selected as the container material, the HDPE material is heated to a molten state, extruded into a cylindrical substrate by an extrusion device and enters into a blow molding mold, and blow molding is performed by a blow molding process; Step 3: Winding of composite fiber layers; According to product requirements, test experiments are carried out to obtain the winding thickness of the composite fiber layer to be achieved, and the fiber winding process is carried out by reinforcing the container shoulder; the container is inflated during the winding process, and the inflation pressure value is 0.05mPa; Step 4: Curing and molding; Step 4.1: Curing at room temperature, fix the wrapped container and keep it in a rotating state for 6 hours; Step 4.2: Post-curing: cure in a curing oven at 50°C for 2h.

[0053] The step 3 is specifically as follows: Fix the container to be wrapped on the rotating equipment, pre-fill the container with air, and create a pressure environment inside the container; Perform fiber winding, and select any one of the axially wound fiber layer, the radially wound fiber layer, and the carbon fiber fabric layer for operation; and then perform the operation on the remaining two fiber layers; During the winding process, the fiber is first immersed in a solvent mixed with bisphenol A epoxy resin and amine curing agent before being wound around the container, so that the mixed solvent adheres to the fiber surface; the carbon fiber fabric layer is attached and fixed by applying the mixed solvent between the carbon fiber fabric layer and the shoulder of the container; The same winding sequence is repeated until the winding thickness reaches a predetermined winding thickness.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fiber-wound pressure vessel, comprising a vessel (1) and a composite fiber layer (2) wound around the outside of the vessel (1), the composite fiber layer (2) comprising a radially wound fiber layer (21) and an axially wound fiber layer (22), the radially wound fiber layer (21) being wound around a straight section of the vessel (1), and the axially wound fiber layer (22) being wound around a portion including the straight section of the vessel (1) and a shoulder of the vessel (1), characterized in that: The composite fiber layer (2) further comprises a carbon fiber fabric layer (23) attached to the shoulder of the container (1); the radially wound fiber layer (21), the axially wound fiber layer (22) and the carbon fiber fabric layer (23) are alternately arranged and each layer is provided with at least one layer; the carbon fiber fabric layer (23) is arranged on either side of the radially wound fiber layer (21), and the edge portion of the carbon fiber fabric layer (23) overlaps the edge portion of the radially wound fiber layer (21).

2. The filament wound pressure vessel according to claim 1, characterized in that: The radially wound fiber layer (21) is provided as at least two layers, including a first radially wound fiber layer (211) and a second radially wound fiber layer (212); The axially wound fiber layer (22) is provided as at least two layers, including a first axially wound fiber layer (221) and a second axially wound fiber layer (222); The carbon fiber fabric layer (23) is provided as at least two layers, including a first carbon fiber fabric layer (231) and a second carbon fiber fabric layer (232); The first carbon fiber fabric layer (231) covers the shoulder of the container (1) and overlaps with the edge portion of the first radially wound fiber layer (211); the second carbon fiber fabric layer (232) covers the shoulder of the container (1) and overlaps with the edge portion of the second radially wound fiber layer (212).

3. The filament wound pressure vessel according to claim 2, characterized in that: The first carbon fiber fabric layer (231) and the second carbon fiber fabric layer (232) are, when unfolded, at least one fan-shaped structure with an opening, the size of the opening varying according to the size of the shoulder of the container (1), and after being attached to the shoulder of the container (1), the edges of the opening overlap each other to form an arc surface that covers the entire shoulder of the container (1), and the width of the overlapping portion is 4 mm to 6 mm.

4. The filament wound pressure vessel according to claim 3, characterized in that: Any of the carbon fiber fabric layers (23) comprises two pieces of assembled and spliced ​​carbon fiber fabric monomers (233), and the width of the overlapped openings and edges of the two pieces of carbon fiber fabric monomers (233) is 4 mm to 6 mm.

5. The filament wound pressure vessel according to claim 3, characterized in that: The area of ​​the second carbon fiber fabric layer (232) after unfolding is larger than the area of ​​the first carbon fiber fabric layer (231) after unfolding, and after installation, the second carbon fiber fabric layer (232) covers the overlapped portion between the first carbon fiber fabric layer (231) and the shoulder of the container (1) and the first radially wound fiber layer (211).

6. The filament wound pressure vessel according to claim 2, characterized in that: The length of the overlapping portion between the first carbon fiber fabric layer (231) and the first radially wound fiber layer (211) is 40 mm to 60 mm.

7. The filament wound pressure vessel (1) according to claim 3, characterized in that: After bonding, the adjacent openings of the first carbon fiber fabric layer (231) and the second carbon fiber fabric layer (232) are spaced apart, and the spacing distance is greater than or equal to 20 mm.

8. The filament wound pressure vessel according to claim 2, characterized in that: The distance between the edge of the first carbon fiber fabric layer (231) and the second carbon fiber fabric layer (232) close to the bottle mouth and the edge of the shoulder hole of the container (1) is 25 mm to 45 mm.

9. A method for preparing a fiber-wound pressure vessel according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Material preparation; Step 1.1 Preparation of carbon fiber fabric layer: According to the diameter and length of the container to be processed and the curvature of the container shoulder, a fan-shaped or annular carbon fiber fabric of corresponding size is selected. The carbon fiber fabric is formed by cross-weaving carbon fibers horizontally and vertically, and an opening is opened from the outer circle to the inner circle; Step 1.2: Resin material selection: select bisphenol A epoxy resin and amine curing agent, mix the two materials, and set the viscosity to 200~500mPa·s; Step 2: Container making; HDPE material is selected as the container material, the HDPE material is heated to a molten state, extruded into a cylindrical substrate by an extrusion device and enters into a blow molding mold, and blow molding is performed by a blow molding process; Step 3: Winding of composite fiber layers; According to product requirements, test experiments are carried out to obtain the winding thickness of the composite fiber layer to be achieved, and the fiber winding process is carried out by reinforcing the container shoulder; the container is inflated during the winding process, and the inflation pressure value is 0.05~1mPa; Step 4: Curing and molding; Step 4.1: Curing at room temperature, fix the wrapped container and keep it in a rotating state for 6 hours; Step 4.2: Post-curing: cure in a curing oven at 50°C for 2h.

10. The method for preparing a filament-wound pressure vessel according to claim 9, characterized in that: The step 3 is specifically as follows: Fix the container to be wrapped on the rotating equipment, pre-fill the container with air, and create a pressure environment inside the container; Perform fiber winding, and select any one of the axially wound fiber layer, the radially wound fiber layer, and the carbon fiber fabric layer for operation; and then perform the operation on the remaining two fiber layers; During the winding process, the fiber is first immersed in a solvent mixed with bisphenol A epoxy resin and amine curing agent before being wound around the container, so that the mixed solvent adheres to the fiber surface; the carbon fiber fabric layer is attached and fixed by applying the mixed solvent between the carbon fiber fabric layer and the shoulder of the container; The same winding sequence is repeated until the winding thickness reaches the predetermined winding thickness.

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