Composite pipeline

Abstract

The utility model discloses a composite pipeline which comprises a plurality of sections of composite pipe bodies and connecting pieces for fixedly connecting every two adjacent sections of composite pipe bodies, and the composite pipe bodies are made of glass fiber reinforced composite materials. The composite pipeline can be used for compressed air energy storage, through the structural design, connection of the composite pipeline can guarantee the strength and sealing performance of the composite pipeline, and the connection efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressed gas transmission pipelines, and more specifically to a composite pipeline. Background Art

[0002] Compressed-Air Energy Storage (CAES) refers to a storage method that uses electrical energy to compress air during the low-load period of the power grid, seals the air at high pressure in abandoned mines, sunken submarine gas tanks, caves, expired oil and gas wells or newly built gas storage wells, and releases compressed air to drive steam turbines to generate electricity during the peak load period of the power grid. As an efficient large-scale energy storage method, compressed air energy storage has the advantages of fast response speed, high energy density, environmental protection and high efficiency. It can well meet the needs of power grid peak shaving and valley filling, new energy grid connection, etc., and is a key technology for realizing new power systems. In efficient compressed air energy storage, gas transmission and extraction pipelines are key components.

[0003] In the prior art, metal pipes are usually used to store compressed air, which have problems such as easy corrosion and short life, which seriously limit the service life of the compressed air energy storage system. In the prior art, there are also composite pipes that can be used to store liquids or gases, but the connection between the composite pipes must not only meet the strength requirements, but also meet the sealing requirements. The commonly used connection methods are gluing or mechanical connection. Although the gluing method can meet the strength and sealing requirements, it takes a long time for the glue to solidify, and the on-site operation efficiency is low; the mechanical connection method is difficult to ensure the strength and sealing requirements of the composite pipe, mainly because the main load-bearing part of the composite pipe is the fiber. If the composite pipe is machined, the continuity of the fiber will be cut off, resulting in a significant reduction in the strength of the composite pipe and the destruction of the sealing. At the same time, because the compressed air has a high-intensity pressure in the pipe, the existing metal pipes and composite pipes do not meet the storage requirements. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a composite pipe that can be used for compressed air energy storage. Through its structural design, the connection of the composite pipe can not only ensure the strength and sealing of the composite pipe, but also improve the connection efficiency.

[0005] To achieve the above purpose, the technical means adopted in this application are as follows: a composite pipe, including several sections of composite pipe body and a connector for fixing two adjacent sections of composite pipe body, the composite pipe body is made of glass fiber reinforced composite material. Compared with traditional metal pipes, composite materials have the advantages of high specific strength, durability, corrosion resistance, etc., which will solve the pain point problem of efficient compressed air energy storage and provide important guarantee for the construction of new power systems.

[0006] The composite pipe body includes a first annular layer, an axial layer, and a second annular layer in order from the inside to the outside in radial direction.

[0007] The inside of the composite pipe is subjected to a pressure of 15 MPa, and the glass fiber of the axial layer is laid along the axial direction of the composite pipe with a layer thickness of 12 mm.

[0008] The laying angle of the glass fibers of the first annular layer is 45° to the axial direction of the composite pipe, and the laying angle of the glass fibers of the second annular layer is 45° to the axial direction of the composite pipe.

[0009] The inclination direction of the laying angle of the second hoop layer is opposite to the inclination direction of the laying angle of the first hoop layer.

[0010] Wherein, the inner wall of the composite pipe body is provided with an inner lining layer, and the inner lining layer is polytetrafluoroethylene felt.

[0011] Among them, the connecting piece includes two mutually connected clamps, the clamps include a hollow body and a connecting part, the hollow body includes a cylindrical inner cavity and a conical inner cavity, the composite pipe body includes a cylindrical section and a conical section, the cylindrical inner cavity is matched and fixed with the cylindrical section, and the conical inner cavity is matched and fixed with the conical section. The two clamps are covered on the periphery of the connection between two adjacent sections of the composite pipe body and then butt-jointed and fixedly connected through the connecting part.

[0012] Wherein, in the radial direction of the hollow body, the connecting portion extends along the edge side of the hollow body in a direction away from the hollow body, and two connecting portions are symmetrically provided on both side edges of the hollow body.

[0013] Among them, the cylindrical inner cavity includes a first cylindrical inner cavity, a second cylindrical inner cavity and a third cylindrical inner cavity, and the conical inner cavity includes a first conical inner cavity and a second conical inner cavity. In the axial direction of the hollow body, the first cylindrical inner cavity, the first conical inner cavity, the second cylindrical inner cavity, the second conical inner cavity and the third cylindrical inner cavity are connected in sequence.

[0014] Among them, two adjacent sections of the composite pipe body include a first composite pipe body and a second composite pipe body, the cylindrical section of the first composite pipe body includes a first cylindrical section and a second cylindrical section, the conical section of the first composite pipe body is a first conical section, and in the axial direction of the composite pipe body, the first cylindrical section, the first conical section and the second cylindrical section are connected in sequence; the cylindrical section of the second composite pipe body includes a third cylindrical section and a fourth cylindrical section, the conical section of the second composite pipe body is a second conical section, and in the axial direction of the composite pipe body, the third cylindrical section, the second conical section and the fourth cylindrical section are connected in sequence.

[0015] Among them, two clamps are covered on the outer periphery of the first composite pipe body and the second composite pipe body after they are butt-jointed to fix the first composite pipe body and the second composite pipe body, the first cylindrical section is matched and fixed with the first cylindrical inner cavity, the first conical section is matched and fixed with the first conical inner cavity, the second cylindrical section and the third cylindrical section are matched and fixed with the second cylindrical inner cavity after they are butt-jointed, the second conical section is matched and fixed with the second conical inner cavity, and the fourth cylindrical section is matched and fixed with the third cylindrical inner cavity.

[0016] The inner diameter of the second cylindrical section is greater than the inner diameter of the first cylindrical section, and the inner diameter of the third cylindrical section is greater than the inner diameter of the fourth cylindrical section.

[0017] The first tapered section and the second tapered section have the same taper and size, and the taper formed by the first tapered section and the axis of the hollow body ranges from 5° to 30°.

[0018] The beneficial effects of the present application are as follows: the composite pipe of the present application is made of composite materials, and has the advantages of high specific strength, durability, corrosion resistance, etc. At the same time, the composite pipe includes several sections of composite pipe bodies and connectors connecting two adjacent sections of composite pipe bodies, and the connectors include two semicircular clamps, and the two clamps are coated on the outer circumference of two adjacent sections of composite pipe bodies, and are fixedly connected by fasteners, so that the two adjacent sections of composite pipe bodies are sealed and connected. A sealing ring is arranged between the composite pipe body and the connector, so that the composite pipe body and the connector are sealed and connected, which on the one hand ensures the reliability of the connection, and on the other hand can prevent impurities from entering the inner cavity of the composite pipe body. At the same time, the clamp is provided with a tapered inner cavity, so that the composite pipe body cannot be offset in its axial direction. The composite pipe of the present application can meet the strength and sealing requirements of the composite pipe body at the same time, and at the same time, the structure of the connector is simple, easy to operate, and can meet the requirements of rapid installation of on-site projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the cross-sectional structure of the composite pipe 10 of the present application;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the clamp 210 of the present application in one view;

[0021] Figure 3 is a schematic diagram of the cross-sectional structure of the clamp 210 of the present application in another view;

[0022] Figure 4 is a schematic cross-sectional structure diagram of the first composite tube body 110 of the present application;

[0023] Figure 5 is a schematic cross-sectional structure diagram of the second composite tube body 120 of the present application;

[0024] Figure 6 yes Figure 3 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0025] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be restrictive, but only as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in various ways in practice in any appropriate manner, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0026] In composite pipelines used to store compressed air, according to actual application requirements, composite pipelines usually need to be designed to be several thousand meters in length. Due to the limited technologies in composite pipeline manufacturing and transportation, composite pipelines are generally composed of several sections of composite pipe bodies spliced ​​together to meet different storage requirements.

[0027] See also Figure 1-Figure 5 The present application provides a composite pipe 10, comprising a plurality of sections of composite pipe bodies 100 and a connector 200 for fixedly connecting two adjacent sections of composite pipe bodies 100, wherein the connector 200 comprises two mutually connected clamps 210, wherein the two clamps 210 are covered on the outer periphery of the connection between the two adjacent sections of composite pipe bodies 100 and then butted and spliced, and the two adjacent sections of composite pipe bodies 100 are tightly connected by fixedly connecting the two clamps 210. The clamp 210 comprises a hollow body 220 and a connecting portion 230, wherein the hollow body 220 comprises a cylindrical inner cavity 221 and a conical inner cavity 222, and the composite pipe body 100 comprises a cylindrical section and a conical section, wherein the cylindrical inner cavity 221 is matched and fixed with the cylindrical section, and the conical inner cavity 222 is matched and fixed with the conical section. Among them, the composite pipe body 100 and the hollow body 220 are both cylindrical, the axis of the composite pipe body 100 and the axis of the hollow body 220 are located on the same straight line, and the cross section of the hollow body 220 is semicircular.

[0028] After the composite pipeline 10 is extended to deep underground such as abandoned mines, its inner wall will be subjected to salt corrosion from underground salt cave brine and brine vapor, mainly chloride ion corrosion, and the inner wall needs a certain smoothness to reduce air resistance, and also needs a certain hardness to reduce damage caused by gravel collisions.

[0029] In one embodiment, several sections of composite pipe bodies 100 are made of glass fiber reinforced composite materials. Compared with traditional metal pipes, composite materials have advantages such as high specific strength, durability, and corrosion resistance, which will solve the pain point of efficient compressed air energy storage and provide important guarantees for the construction of new power systems. Among them, the composite pipe body 100 can be formed by impregnating glass fiber with epoxy resin and curing, and can be prepared by winding and other technologies.

[0030] When the composite pipe 10 transports compressed air, it is subjected to gravity and internal pressure. A reasonable layer design for the pipe structure can ensure that the strength of the composite pipe 10 meets the transport requirements. Part of the layer bears axial pressure, and part of the layer bears annular pressure.

[0031] In one embodiment, the inner wall of the composite pipe 10 is subjected to a pressure of 15 MPa, and the composite pipe body 100 includes a first annular layer, an axial layer, and a second annular layer from the inside to the outside in its radial direction. The first annular layer and the second annular layer are subjected to annular pressure, and the axial layer is subjected to axial pressure. The glass fiber of the axial layer is laid along the axial direction of the composite pipe 10, and the layer thickness is 12 mm. The laying angle of the glass fiber of the first annular layer is 45° with the axial direction of the composite pipe 10, and the layer thickness is 6 mm. The laying angle of the glass fiber of the second annular layer is 45° with the axial direction of the composite pipe 10, and the inclination direction of the laying angle of the glass fiber of the second annular layer is opposite to the inclination direction of the laying angle of the glass fiber of the first annular layer. The winding process with a laying angle less than 45° belongs to small-angle winding, which is difficult to form and inefficient; when the laying angle is greater than 45°, the axial strength that can be provided by the first annular layer or the second annular layer decreases as the laying angle increases. Therefore, in this embodiment, the laying angle is selected to be 45°, which is conducive to processing and molding, improving production efficiency, and optimizing the stress of the composite pipe body 100. At the same time, the inner wall of the composite pipe body 100 is also provided with an inner lining layer, and the inner lining layer adopts a 1mm thick polytetrafluoroethylene felt. Polytetrafluoroethylene has excellent properties, including: 1) corrosion resistance, which can withstand various acids, alkalis, and salt media; 2) a low friction coefficient, which can reduce wind resistance; 3) wide temperature range performance and heat-oxidation aging resistance. Of course, the inner lining layer can also be selected from other materials such as polyester felt, polyethylene felt, polypropylene felt, etc. according to the application environment, and there is no limitation here.

[0032] In other embodiments, when the inner wall of the composite pipe is subjected to different pressures, the axial strength and circumferential strength of the composite pipe can be ensured by designing different laying angles and thicknesses of the first circumferential layer or the axial layer or the second circumferential layer, and by designing different numbers of circumferential layers or axial layers, that is, the composite pipe body includes, from the radial inside to the outside, the first circumferential layer, the first axial layer, the second circumferential layer, the second axial layer, or other structured layer designs, which are not limited here.

[0033] In one embodiment, if Figure 1As shown, in the direction parallel to the axis of the composite pipe body 100, the direction from the first end 201 of the connector 200 to the second end 202 of the connector 200 is defined as a first direction F1, and the direction from the second end 202 of the connector 200 to the first end 201 of the connector 200 is defined as a second direction F2, and the first direction F1 and the second direction F2 are parallel to each other and in opposite directions. At the same time, in two adjacent sections of the composite pipe body 100, the composite pipe body 100 located at the first end 201 of the connector 200 is defined as a first composite pipe body 110, and the composite pipe body 100 located at the second end 202 of the connector 200 is defined as a second composite pipe body 120.

[0034] The cylindrical inner cavity 221 of the clamp 210 includes a first cylindrical inner cavity 2211, a second cylindrical inner cavity 2212 and a third cylindrical inner cavity 2213, and the conical inner cavity 222 includes a first conical inner cavity 2221 and a second conical inner cavity 2222. In the axial direction of the hollow body 220, the first cylindrical inner cavity 2211, the first conical inner cavity 2221, the second cylindrical inner cavity 2212, the second conical inner cavity 2222 and the third cylindrical inner cavity 2213 are connected in sequence along the first direction F1 to form a continuous cylindrical inner cavity for accommodating and fastening the first composite pipe body 110 and the second composite pipe body 120.

[0035] In the radial direction of the hollow body 220, the connection part 230 extends along the edge side of the hollow body 220 in the direction away from the hollow body 220, and the end surface of the connection part 230 located in the radial direction of the hollow body 220 is the connection surface of the two clamps 210 butted together. In this embodiment, two connection parts 230 are symmetrically arranged on the edges of both sides of the hollow body 220, and because the cross section of the hollow body 220 is semicircular, when the two clamps 210 are butted together, the inner cavity formed by the hollow body 220 tightly accommodates the composite pipe body 100, and the connection surface of the two clamps 210 butted together is located on the axial section of the composite pipe body 100. In the axial direction of the hollow body 220, a plurality of through holes 231 are arranged on the connection part 230, and after the connection parts 230 of the two clamps 210 are matched, fasteners are inserted through the plurality of through holes 231 to fix and connect the two clamps 210. Among them, the clamps 210 are made of steel or other metal materials.

[0036] The cylindrical section 111 of the first composite pipe body 110 includes a first cylindrical section 1111 and a second cylindrical section 1112. The conical section of the first composite pipe body 110 is the first conical section 112. In the axial direction of the composite pipe body 100, the first cylindrical section 1111, the first conical section 112 and the second cylindrical section 1112 are sequentially connected along the first direction F1 to form a continuous first composite pipe body 110. The first cylindrical section 1111 continues to extend along the second direction F2 as the main body of the first composite pipe body 110, and is used to store compressed air (only a schematic diagram of the structure is shown in the figure).

[0037] The cylindrical section 121 of the second composite pipe body 120 includes a third cylindrical section 1211 and a fourth cylindrical section 1212, and the conical section of the second composite pipe body 120 is the second conical section 122. In the axial direction of the composite pipe body 100, the third cylindrical section 1211, the second conical section 122 and the fourth cylindrical section 1212 are sequentially connected along the first direction F1 to form a continuous second composite pipe body 120. Among them, the fourth cylindrical section 1212 continues to extend along the first direction F1, serving as the main body of the second composite pipe body 120, and is used to store compressed air (only a structural schematic diagram is shown in the figure).

[0038] The second cylindrical segment 1112 of the first composite tube body 110 and the third cylindrical segment 1211 of the second composite tube body 120 have the same size. By fixing the second cylindrical segment 1112 and the third cylindrical segment 1211 together, the adjacent first composite tube bodies 110 and second composite tube bodies 120 can be fixedly connected. Specifically, after the second cylindrical segment 1112 and the third cylindrical segment 1211 are butt-jointed, two clamps 210 are wrapped around the outer circumference of the first composite pipe body 110 and the second composite pipe body 120, so that the first cylindrical segment 1111 is matched and fixed with the first cylindrical inner cavity 2211, the first conical segment 112 is matched and fixed with the first conical inner cavity 2221, the second cylindrical segment 1112 and the third cylindrical segment 1211 are butt-jointed and matched and fixed with the second cylindrical inner cavity 2212, the second conical segment 122 is matched and fixed with the second conical inner cavity 2222, and the fourth cylindrical segment 1212 is matched and fixed with the third cylindrical inner cavity 2213, and the two clamps 210 are fixedly connected by inserting fasteners on the corresponding matching connecting parts 230, thereby fixing the first composite pipe body 110 and the second composite pipe body 120.

[0039] At the same time, the inner diameter of the end of the first conical section 112 of the first composite pipe body 110 close to the second cylindrical section 1112 is larger than the inner diameter of the end of the first conical section 112 close to the first cylindrical section 1111, that is, the inner diameter of the second cylindrical section 1112 is larger than the inner diameter of the first cylindrical section 1111. This is because the connection between the connector 200 and the two adjacent sections of the composite pipe body 100 is a stress weak point of the entire composite pipe 10. When high-intensity compressed air is stored in the composite pipe 10, the connection is subjected to high axial tensile force and radial tensile force, and the axial tensile force causes the two adjacent sections of the composite pipe body 100 to move away from each other. By setting a first tapered section 112 with a certain taper, the inner diameter of the second cylindrical section 1112 is larger than the inner diameter of the first cylindrical section 1111, which can increase the contact surface pressure between the composite pipe body 100 and the clamp 210, thereby providing a greater friction force until it is balanced with the axial tensile force, and the composite pipe body 100 and the clamp 210 are further locked, thereby improving the connection strength of the two adjacent composite pipe bodies 100, and the bevel taper can also provide a partial sealing effect. On the contrary, if the inner diameter of the first cylindrical section is larger than the inner diameter of the second cylindrical section, the composite pipe body will easily detach from the connector, causing the connection between the two adjacent sections of the composite pipe body to fail, thereby destroying the entire composite pipe. Similarly, the inner diameter of the third cylindrical segment 1211 is greater than the inner diameter of the fourth cylindrical segment 1212 , and details thereof will not be repeated.

[0040] It should be noted that the above-mentioned matching and fixing of the cylindrical inner cavity and the cylindrical segment, and the matching and fixing of the conical inner cavity and the conical segment, means that the inner diameter of the cylindrical inner cavity matches the outer diameter of the cylindrical segment, and the inner diameter of the conical inner cavity matches the outer diameter of the conical segment, so that two adjacent composite pipe bodies 100 can be tightly fixed in the inner cavity formed by the two clamps 210.

[0041] In this embodiment, the first tapered section 112 of the first composite tube body 110 and the second tapered section 122 of the second composite tube body 120 have the same taper and size, and the taper formed by the first tapered section 112 or the second tapered section 122 and the axis of the hollow body 220 ranges from 5° to 30°. The taper of the composite pipe body 100 is designed to be 5° to 30°. On the one hand, the taper can be used to achieve a tight connection between two adjacent sections of the composite pipe body 100; on the other hand, the angle range is a small angle. Taking the first composite pipe body 110 as an example, the small-angle taper design makes the transition between the first cylindrical section 1111 and the first conical section 112, and the first conical section 112 and the second cylindrical section 1112 smoother, avoiding stress concentration between the first cylindrical section 1111 and the first conical section 112, and the first conical section 112 and the second cylindrical section 1112 due to excessively large angles, resulting in mechanical damage at the connection between the first cylindrical section 1111 and the first conical section 112, and the connection between the first conical section 112 and the second cylindrical section 1112. The second cylindrical section 1112 of the first composite pipe body 110 and the third cylindrical section 1211 of the second composite pipe body 120 are of the same size, so that the first composite pipe body 110 and the second composite pipe body 120 are symmetrically arranged relative to their connection, and then only one size of connector 200 is required to be designed in the entire composite pipe 10 to meet the use requirements, thereby expanding the versatility of the connector 200. In other embodiments, the taper and length of the first tapered section and the second tapered section may be inconsistent, and the length of the second cylindrical section and the third cylindrical section may be inconsistent, as long as different clamp inner cavity structures are arranged accordingly, and the details are not repeated.

[0042] Furthermore, in one embodiment, the outer diameter of the composite pipe body 100 is slightly larger than the inner diameter of the clamp 210, that is, the outer diameter of the cylindrical section is slightly larger than the inner diameter of the cylindrical inner cavity, and the outer diameters of the conical section in each direction are larger than the inner diameters of the corresponding conical inner cavity in each direction. The difference between the outer diameter of the composite pipe body 100 and the inner diameter of the clamp 210 is in the range of 0.1 mm to 0.5 mm, and an interference fit is achieved. On the one hand, a close fit connection between the composite pipe body 100 and the clamp 210 can be achieved, and on the other hand, the overall strength of the composite pipe body 100 will not be affected.

[0043] Continue reading Figure 2 The conical inner cavity 222 of the hollow body 220 is provided with a plurality of annular grooves 223, which are arranged along the circumference of the hollow body 220, and the plurality of annular grooves 223 are arranged at intervals along the axial direction of the hollow body 220. A sealing ring is arranged in the annular groove 223, so that the composite pipe body 100 is sealed and connected with the hollow body 220 to prevent leakage of compressed air.

[0044] In one embodiment, two annular grooves 223 are respectively provided on the first tapered inner cavity 2221 and the second tapered inner cavity 2222. When two adjacent composite pipe bodies 100 are covered and fixed by two clamps 210, the composite pipe body 100 is slightly displaced and deformed when it is subjected to axial tension. Since the deformation is conducive to improving the sealing performance, better sealing can be achieved with the sealing ring. At the same time, the greater the axial tension that the composite pipe body 100 withstands, the better the sealing performance between the composite pipe body 100 and the hollow body 220.

[0045] In other embodiments, the first conical inner cavity and the second conical inner cavity may each have one, three or other number of annular grooves, or the first cylindrical inner cavity, the second cylindrical inner cavity and the third cylindrical inner cavity may also be provided with several annular grooves, which is not limited here.

[0046] Combination Figure 3 and Figure 6 As shown, the connecting portion 230 is provided with a strip groove 232 on the radial end face of the hollow body 220, and the strip groove 232 extends along the axial direction of the hollow body 220. When the two clamps 210 are butt-jointed, a sealing strip is provided in the strip groove 232 to seal the two clamps 210 and prevent water vapor, impurities, etc. from entering the connection between the two adjacent composite pipe bodies 100, thereby avoiding corrosion of the inner cavity of the composite pipe body 100.

[0047] The composite pipe of the present application includes several sections of composite pipe bodies and connectors. The connectors include two semicircular clamps. The two clamps are coated on the outer circumference of two adjacent composite pipe bodies and are fixedly connected by fasteners, so that the two adjacent composite pipe bodies are sealed and connected. A sealing ring is arranged between the composite pipe body and the connector, so that the composite pipe body and the connector are sealed and connected, which ensures the reliability of the connection on the one hand and prevents impurities from entering the inner cavity of the composite pipe body on the other hand. At the same time, the clamp is provided with a tapered inner cavity, so that the composite pipe body cannot be offset in its axial direction. Compared with the traditional composite pipe body connection method, the present application does not require machining of the composite pipe body, and can also avoid the long curing time of the composite pipe body produced by gluing. The composite pipe of the present application can meet the strength and sealing requirements of the composite pipe body at the same time. At the same time, the structure of the connector is simple and easy to operate, which can meet the requirements of rapid installation of on-site projects.

[0048] The technical content and technical features of the present application have been disclosed above. However, it is understood that, under the creative concept of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present application and fall within the protection scope of the claims of the present application.

Claims

1. A composite pipe, characterized in that: The composite pipe comprises a plurality of sections of composite pipe bodies and a connector for fixedly connecting two adjacent sections of the composite pipe bodies. The connector comprises two mutually connected clamps. The two clamps are wrapped around the periphery of the connection between two adjacent sections of the composite pipe bodies and then butted and spliced ​​together to tightly connect the two adjacent sections of the composite pipe bodies. The composite pipe body is made of glass fiber reinforced composite material.

2. The composite pipe according to claim 1, characterized in that: The composite pipe body includes a first annular layer, an axial layer, and a second annular layer in sequence from the inside to the outside of the composite pipe body.

3. The composite pipe according to claim 2, characterized in that: The interior of the composite pipe is subjected to a pressure of 15 MPa, and the glass fibers of the axial layer are laid along the axial direction of the composite pipe, with a layer thickness of 12 mm.

4. The composite pipe according to claim 3, characterized in that: The laying angle of the glass fibers of the first annular layer forms an angle of 45° with the axial direction of the composite pipe, and the laying angle of the glass fibers of the second annular layer forms an angle of 45° with the axial direction of the composite pipe.

5. The composite pipe according to claim 4, characterized in that: The inclination direction of the laying angle of the second hoop layer is opposite to the inclination direction of the laying angle of the first hoop layer.

6. The composite pipe according to claim 1, characterized in that: The inner wall of the composite pipe body is provided with an inner lining layer, and the inner lining layer is polytetrafluoroethylene felt.

7. The composite pipe according to claim 1, characterized in that: The clamp includes a hollow body and a connecting portion, the hollow body includes a cylindrical inner cavity and a conical inner cavity, the composite pipe body includes a cylindrical section and a conical section, the cylindrical inner cavity is matched and fixed with the cylindrical section, the conical inner cavity is matched and fixed with the conical section, and the two clamps are covered on the periphery of the connection between two adjacent sections of the composite pipe body and then butt-jointed and fixedly connected through the connecting portion.

8. The composite pipe according to claim 7, characterized in that: In the radial direction of the hollow body, the connection portion extends along the edge side of the hollow body toward a direction away from the hollow body, and two connection portions are symmetrically provided on both side edges of the hollow body.

9. The composite pipe according to claim 7, characterized in that: The cylindrical inner cavity includes a first cylindrical inner cavity, a second cylindrical inner cavity and a third cylindrical inner cavity, and the conical inner cavity includes a first conical inner cavity and a second conical inner cavity. In the axial direction of the hollow body, the first cylindrical inner cavity, the first conical inner cavity, the second cylindrical inner cavity, the second conical inner cavity and the third cylindrical inner cavity are connected in sequence.

10. The composite pipe according to claim 9, characterized in that: The two adjacent sections of the composite pipe body include a first composite pipe body and a second composite pipe body, the cylindrical section of the first composite pipe body includes a first cylindrical section and a second cylindrical section, the conical section of the first composite pipe body is a first conical section, and in the axial direction of the composite pipe body, the first cylindrical section, the first conical section and the second cylindrical section are connected in sequence; the cylindrical section of the second composite pipe body includes a third cylindrical section and a fourth cylindrical section, the conical section of the second composite pipe body is a second conical section, and in the axial direction of the composite pipe body, the third cylindrical section, the second conical section and the fourth cylindrical section are connected in sequence.

11. The composite pipe according to claim 10, characterized in that: The two clamps are wrapped around the outer circumference of the first composite pipe body and the second composite pipe body after they are butt-jointed to fix the first composite pipe body and the second composite pipe body, the first cylindrical section is matched and fixed with the first cylindrical inner cavity, the first conical section is matched and fixed with the first conical inner cavity, the second cylindrical section and the third cylindrical section are butt-jointed to match and fix with the second cylindrical inner cavity, the second conical section is matched and fixed with the second conical inner cavity, and the fourth cylindrical section is matched and fixed with the third cylindrical inner cavity.

12. The composite pipe according to claim 10, characterized in that: The inner diameter of the second cylindrical section is greater than the inner diameter of the first cylindrical section, and the inner diameter of the third cylindrical section is greater than the inner diameter of the fourth cylindrical section.

13. The composite pipe according to claim 10, characterized in that: The first tapered section and the second tapered section have the same taper and size, and the taper formed by the first tapered section and the axis of the hollow body ranges from 5° to 30°.

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