Composite pipeline

Abstract

A composite pipeline (10), comprising a plurality of composite pipe bodies (100) and a connecting member (200) fixedly connecting every two adjacent composite pipe bodies (100). The connecting member (200) comprises two clamps (210) which are connected to each other; each clamp (210) comprises a hollow body (220) and connecting portions (230); the hollow body (220) comprises cylindrical inner cavities (221) and conical inner cavities (222); each composite pipe body comprises cylindrical sections (111, 121) and a conical section; each cylindrical inner cavity (221) is matched with and fixed to a cylindrical section (111, 121); each conical inner cavity (222) is matched with and fixed to a conical section; and the two clamps (210) cover the outer periphery of the joint of two adjacent composite pipe bodies (100), are butted and assembled, and then are fixedly connected by means of the connecting portions (230).

Description

Composite pipes Technical Field

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

[0002] Compressed-Air Energy Storage (CAES) refers to an energy storage method that uses electrical energy to compress air during periods of low grid load. This air is sealed at high pressure in abandoned mines, sunken submarine gas tanks, caves, expired oil and gas wells, or newly built gas storage wells. During peak grid load periods, the compressed air is released to drive steam turbines to generate electricity. As an efficient large-scale energy storage method, CAES offers the advantages of fast response, high energy density, environmental protection, and high efficiency. It can effectively meet the needs of grid peak shaving and valley filling, and the integration of new energy sources, 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 meet not only strength requirements, but also 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, 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. Summary of the Invention

[0004] The present application provides a composite pipe, comprising several sections of composite pipe body and a connector for fixedly connecting two adjacent sections of composite pipe body, the connector comprising two mutually connected clamps, the clamp comprising a hollow body and a connecting portion, the hollow body comprising a cylindrical inner cavity and a conical inner cavity, the composite pipe body comprising a cylindrical section and a conical section, the cylindrical inner cavity and the cylindrical section are matched and fixed, and the conical inner cavity and the conical section are matched and fixed, the two clamps are covered on the outer periphery of the connection between the two adjacent sections of composite pipe body, then butted and spliced ​​and fixedly connected through the connecting portion.

[0005] In one embodiment, 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.

[0006] In one embodiment, the connection surface of the two clamps is located on the axial cross section of the composite pipe body.

[0007] In one embodiment, a plurality of through holes are provided on the connecting portion. After the connecting portions of the two clamps are matched with each other, fasteners are passed through the through holes to securely connect the two clamps.

[0008] In one embodiment, a strip-shaped groove is provided on the connecting portion, and a sealing strip is provided in the strip-shaped groove.

[0009] In one embodiment, 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.

[0010] In one embodiment, two adjacent sections of composite tube bodies include a first composite tube body and a second composite tube body, the cylindrical section of the first composite tube body includes a first cylindrical section and a second cylindrical section, the tapered section of the first composite tube body is a first tapered section, and in the axial direction of the composite tube body, the first cylindrical section, the first tapered section, and the second cylindrical section are connected in sequence; the cylindrical section of the second composite tube body includes a third cylindrical section and a fourth cylindrical section, the tapered section of the second composite tube body is a second tapered section, and in the axial direction of the composite tube body, the third cylindrical section, the second tapered section, and the fourth cylindrical section are connected in sequence.

[0011] In one embodiment, two clamps are wrapped around the outer periphery of the first composite tube body and the second composite tube body after they are butt-jointed to fix the first composite tube body and the second composite tube body together, 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 to each other, 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.

[0012] In one embodiment, the inner diameter of the second cylindrical section is larger than the inner diameter of the first cylindrical section, and the inner diameter of the third cylindrical section is larger than the inner diameter of the fourth cylindrical section.

[0013] In one embodiment, the conical inner cavity is provided with a plurality of annular grooves, and the annular grooves are arranged along the circumference of the hollow body.

[0014] In one embodiment, a plurality of annular grooves are arranged at intervals along the axial direction of the hollow body, and sealing rings are arranged in the annular grooves.

[0015] In one embodiment, the outer diameter of the composite tube is slightly larger than the inner diameter of the clamp, and the difference between the outer diameter of the composite tube and the inner diameter of the clamp is in the range of 0.1 mm to 0.5 mm.

[0016] In one embodiment, the composite pipe body is made of glass fiber reinforced composite material.

[0017] In one embodiment, the composite pipe body includes, radially from the inside to the outside, a first circumferential layer, an axial layer, and a second circumferential layer.

[0018] In one embodiment, the laying angle of the glass fiber of the first circumferential layer is 45° with the axial direction of the composite pipe, the laying angle of the glass fiber of the second circumferential layer is 45° with the axial direction of the composite pipe, and the inclination direction of the laying angle of the second circumferential layer is opposite to the inclination direction of the laying angle of the first circumferential layer.

[0019] In one embodiment, the thickness of the first hoop layer is equal to the thickness of the second hoop layer.

[0020] In one embodiment, an inner wall of the composite pipe body is provided with an inner lining layer, and the inner lining layer is polytetrafluoroethylene felt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of a partial cross-sectional structure of a composite pipe 10 of the present application;

[0022] FIG2 is a schematic cross-sectional view of a clamp 210 of the present application;

[0023] FIG3 is a schematic cross-sectional view of the clamp 210 of the present application in another view;

[0024] FIG4 is a schematic cross-sectional view of the first composite tube 110 of the present application;

[0025] FIG5 is a schematic cross-sectional view of the second composite tube 120 of the present application;

[0026] FIG6 is an enlarged schematic diagram of point A in FIG3 . DETAILED DESCRIPTION

[0027] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to variously apply the present application in any appropriate manner in practice, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0028] In composite pipelines used to store compressed air, composite pipelines are usually designed to be several thousand meters long according to actual application requirements. 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.

[0029] Referring to Figures 1-5, the present application provides a composite pipe 10 comprising several sections of composite pipe 100 and a connector 200 for fixedly connecting two adjacent sections of composite pipe 100. The connector 200 comprises two interconnected clamps 210. The two clamps 210 are wrapped around the outer periphery of the connection between the two adjacent sections of composite pipe 100 and then butted together. By fixedly connecting the two clamps 210, the two clamps 210 clamp the outer periphery of the adjacent composite pipe 100, thereby tightly connecting the two adjacent sections of composite pipe 100. The clamps 210 comprise a hollow body 220 and a connecting portion 230. The hollow body 220 comprises a cylindrical inner cavity 221 and a tapered inner cavity 222. The composite pipe 100 comprises a cylindrical section and a tapered section. The cylindrical inner cavity 221 is fixedly matched with the cylindrical section, and the tapered inner cavity 222 is fixedly matched with the tapered section. Among them, the composite tube body 100 and the hollow body 220 are both cylindrical, the axis of the composite tube body 100 and the axis of the hollow body 220 are located on the same straight line, the cross-section of the hollow body 220 is semicircular, and the hollow bodies 220 of the two clamps 210 are spliced ​​into a cylindrical inner cavity with a circular cross-section for accommodating the composite tube body 100.

[0030] When the composite pipe 10 is extended deep underground, such as in abandoned mines, its inner wall is subject to salt corrosion from underground salt cavern brine and brine vapor, primarily chloride ion corrosion. Furthermore, the inner wall requires a certain degree of smoothness to reduce air resistance and a certain degree of hardness to reduce damage from gravel impacts. The composite pipe 10 provided in this application can be used for compressed air energy storage. Through a reasonable structural design, the connection of the composite pipe 10 ensures both strength and sealing of the composite pipe 10 and improves connection efficiency.

[0031] In one embodiment, several sections of composite pipe 100 are made of glass fiber reinforced composite materials. Compared to traditional metal pipes, composite materials offer advantages such as high specific strength, durability, and corrosion resistance. They address the challenges of efficient compressed air energy storage and provide important support for the construction of new power systems. Composite pipe 100 can be formed by impregnating glass fiber with epoxy resin and curing it, and can be manufactured using techniques such as winding.

[0032] When transporting compressed air, the composite pipe 10 is subjected to gravity and internal pressure. A rationally designed layer layout for the pipe structure can ensure that the composite pipe 10 has the strength required for transporting air. Part of the layer layout bears axial pressure, while part of the layer layout bears hoop pressure.

[0033] In one embodiment, the composite pipe body 100 includes a first circumferential layer, an axial layer, and a second circumferential layer in order from the inside to the outside in its radial direction. The glass fibers of the axial layer are laid along the axial direction of the composite pipe 10, and the axial layer bears axial pressure; the glass fibers of the first circumferential layer and the second circumferential layer are laid at a certain angle to the axial direction of the composite pipe 10, and the first circumferential layer and the second circumferential layer mainly bear circumferential pressure. Among them, the laying angle of the glass fibers of the first circumferential layer is 45° to the axial direction of the composite pipe 10, and the laying angle of the glass fibers of the second circumferential layer is 45° to the axial direction of the composite pipe 10, and the inclination direction of the laying angle of the glass fibers of the second circumferential layer is opposite to the inclination direction of the laying angle of the glass fibers of the first circumferential layer, and the thickness of the first circumferential layer and the second circumferential layer are equal. Setting the thickness of the second annular layer to be equal to that of the first annular layer can achieve the effect of a balanced ply design. This is because when the composite pipe 10 is under pressure, the shear coupling coefficients generated by the first and second annular layers, due to their opposite inclination directions, can offset each other, so that the composite pipe body 100 as a whole does not generate additional stress, achieving a balanced force effect, and thus making the composite pipe 10 as a whole balanced.

[0034] In the design of the composite pipe body 100, the axial stress is estimated using the axial pressure formula P = F / S, where P is the axial normal stress borne by the object, F is the pressure borne by the object, and S is the area of ​​the object borne by the pressure. The hoop stress is calculated using the thin-walled cylinder hoop stress calculation method p s =P a ×d / 2t,p s is the thin wall hoop stress, P a is the internal pressure, d is the inner diameter of the container, and t is the wall thickness of the container. It is roughly assumed that the axial layer of the composite pipe body 100 only bears axial pressure, and the annular layer includes a first annular layer and a second annular layer of equal thickness. The following is only the calculation of the thickness of the first annular layer for explanation. It is roughly assumed that the first annular layer and the second annular layer only bear annular pressure. Combining the above formula, the axial layer thickness t a The thickness of the first circumferential layer t s A rough calculation is performed using the following formula: a =F a / (f a ×π×D a ); t s =P a ×d / (4×f s );

[0035] In t a In the calculation formula, F a is the rated axial pressure; f a D is the compressive strength of a single layer of composite material along the fiber direction in the axial direction of the composite pipe body 100; ais the diameter of the circle formed by the center line of the pipe wall of the composite pipe body 100, D a The calculation formula is (D+d) / 2, where D is the outer diameter of the composite tube body 100 and d is the inner diameter of the composite tube body 100. s In the calculation formula, P a is the internal pressure of the composite pipe body 100; f s is the tensile strength of the first circumferential layer of the composite pipe body 100 along the axial direction of the composite pipe. In this embodiment, the first circumferential layer is at a 45° angle to the axial direction of the composite pipe body 100; d is the inner diameter of the composite pipe body 100. Among them, in the composite pipe body 100 using a certain formula and molding process, its f a The value of is certain and can be directly detected according to the test specified in the current national standard GB / T 1448 "Test method for compression properties of fiber reinforced plastics"; its f s The value can also be tested according to the test specified in the current national standard GB / T 1447 "Test method for tensile properties of fiber reinforced plastics". a 、P a , d, D a The value is obtained based on the application scenario of the composite pipe body 100, and then the axial layer thickness t can be calculated. a and the thickness of the circumferential layer t s The value of .

[0036] In one application scenario, the axial fiber strength f of the composite pipe body 100 is a =500MPa, the axial pressure F borne by the composite pipe 10 a = 11000 kN, the internal pressure P borne by the composite pipe 10 a =15MPa, the hoop fiber strength f of the composite pipe body 100 s =350MPa. According to the above formula, when the wall thickness of the composite pipe body 100 is 24mm and the inner diameter is 565mm, the axial layer thickness t can be calculated. a About 12mm, the thickness of the first circumferential layer t s =6mm, and it can be concluded that the thickness of the second circumferential layer is also 6mm.

[0037] Among them, the winding process with a laying angle of less than 45° belongs to small-angle winding, which is difficult to process and has low efficiency; when the laying angle is greater than 45°, the axial strength that the first circumferential layer or the second circumferential layer can provide decreases as the laying angle increases. Therefore, in this embodiment, the laying angle of the circumferential layer is selected to be 45°, which is beneficial to the processing and forming of the composite pipe body 100, improves production efficiency, and optimizes 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 1mm thick polytetrafluoroethylene felt. Polytetrafluoroethylene has excellent properties, including: 1) corrosion resistance, which can withstand various acid, alkali, and salt media; 2) a low friction coefficient, which can reduce wind resistance; 3) wide temperature range performance and resistance to heat and oxygen aging. 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.

[0038] In other embodiments, when the inner wall of the composite pipe is subjected to different pressures, or when the composite pipe is set to different pipe diameters and wall thicknesses, the axial strength and circumferential strength of the composite pipe can be ensured by designing different laying angles and layer thicknesses of the first circumferential layer or 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 the first circumferential layer, the first axial layer, the second circumferential layer, the second axial layer in sequence from the radial inside to the outside, or other structured layer designs, which are not limited here.

[0039] In one embodiment, as shown in FIG1 , in a direction parallel to the axis of the composite pipe 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. The first direction F1 and the second direction F2 are parallel to each other and in opposite directions. Furthermore, in two adjacent sections of composite pipe 100, the composite pipe 100 located at the first end 201 of the connector 200 is defined as a first composite pipe 110, and the composite pipe 100 located at the second end 202 of the connector 200 is defined as a second composite pipe 120.

[0040] 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.

[0041] In the radial direction of the hollow body 220, the connecting portion 230 extends along the edge of the hollow body 220 in a direction away from the hollow body 220. The radial end surface of the connecting portion 230 on the hollow body 220 serves as the connecting surface for the two clamps 210 to butt together. In this embodiment, two connecting portions 230 are symmetrically provided on either side of the hollow body 220. Because the cross-section of the hollow body 220 is semicircular, when the two clamps 210 are butt-jointed, the inner cavity formed by the hollow body 220 tightly accommodates the composite pipe body 100. The connecting surface of the two clamps 210 is located in the axial cross-section of the composite pipe body 100. The connecting portion 230 is provided with a plurality of through-holes 231. After the connecting portions 230 of the two clamps 210 are aligned, fasteners are inserted through the through-holes 231 to securely connect the two clamps 210. The clamps 210 are made of steel or other metal materials.

[0042] The cylindrical section 111 of the first composite tube 110 includes a first cylindrical section 1111 and a second cylindrical section 1112. The tapered section of the first composite tube 110 is the first tapered section 112. In the axial direction of the composite tube 100, the first cylindrical section 1111, the first tapered section 112, and the second cylindrical section 1112 are sequentially connected along the first direction F1 to form a continuous first composite tube 110. The first cylindrical section 1111 continues to extend along the second direction F2 and serves as the main body of the first composite tube 110, used for storing compressed air (the structure is only shown in the figure for schematic representation).

[0043] The cylindrical section 121 of the second composite tube body 120 includes a third cylindrical section 1211 and a fourth cylindrical section 1212. The tapered section of the second composite tube body 120 is the second tapered section 122. In the axial direction of the composite tube body 100, the third cylindrical section 1211, the second tapered section 122, and the fourth cylindrical section 1212 are sequentially connected along the first direction F1 to form a continuous second composite tube body 120. The fourth cylindrical section 1212 continues to extend along the first direction F1 and serves as the main body of the second composite tube body 120, used for storing compressed air (the structure is only shown in the figure for schematic representation).

[0044] The second cylindrical section 1112 of the first composite tube body 110 and the third cylindrical section 1211 of the second composite tube body 120 have the same size. By fixing the second cylindrical section 1112 and the third cylindrical section 1211 together, the adjacent first composite tube bodies 110 and the 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 and spliced, 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 then 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 connection parts 230, thereby fixing the first composite pipe body 110 and the second composite pipe body 120.

[0045] At the same time, the inner diameter of the end of the first conical section 112 of the first composite tube 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 composite pipe sections 100 is a stress-weakened point in the entire composite pipe 10. When high-intensity compressed air is stored within the composite pipe 10, this connection is subjected to high axial and radial tensile forces. The axial tensile force causes the two adjacent composite pipe sections 100 to move away from each other. By providing a first tapered first conical section 112 with a certain taper, and making the inner diameter of the second cylindrical section 1112 larger than the inner diameter of the first cylindrical section 1111, the contact surface pressure between the composite pipe 100 and the clamp 210 is increased, thereby providing greater friction until the axial tensile force is balanced, further tightening the composite pipe 100 and the clamp 210, thereby improving the connection strength between the two adjacent composite pipe sections 100. The beveled taper also provides a partial sealing effect. Conversely, if the inner diameter of the first cylindrical section is larger than that of the second cylindrical section, the composite pipe section will easily separate from the connector, causing the connection between the two adjacent composite pipe sections to fail, thereby damaging the entire composite pipe. Similarly, the inner diameter of the third cylindrical segment 1211 is set to be larger than the inner diameter of the fourth cylindrical segment 1212 , and details are omitted for brevity.

[0046] 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 the two adjacent composite pipe bodies 100 can be tightly fixed in the inner cavity formed by the two clamps 210.

[0047] In this embodiment, the first tapered section 112 of the first composite tube 110 and the second tapered section 122 of the second composite tube 120 have the same taper and dimensions, but the inclination direction of the first tapered section 112 relative to the axial direction of the composite tube 100 is opposite to the inclination direction of the second tapered section 122 relative to the axial direction of the composite tube 100. The taper formed by the first tapered section 112 or the second tapered section 122 and the axial direction 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 achieve a tight connection between two adjacent sections of the composite pipe body 100; on the other hand, this 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, allowing the first composite pipe body 110 and the second composite pipe body 120 to be symmetrically arranged relative to their connection. Consequently, only one size of connector 200 is required for the entire composite pipe 10 to meet all usage requirements, thereby increasing the versatility of the connector 200. In other embodiments, the first and second tapered sections may have different tapers and lengths, and the second and third cylindrical sections may have different lengths, as long as different clamp lumen structures are provided accordingly. The details will not be repeated here.

[0048] Furthermore, in one embodiment, the outer diameter of the composite tube body 100 is slightly larger than the inner diameter of the clamp 210. Specifically, the outer diameter of the cylindrical section is slightly larger than the inner diameter of the cylindrical lumen, and the outer diameter of the tapered section in each direction is larger than the inner diameter of the corresponding tapered lumen in each direction. The difference between the outer diameter of the composite tube body 100 and the inner diameter of the clamp 210 is in the range of 0.1 mm to 0.5 mm, achieving an interference fit. This allows for a tight connection between the composite tube body 100 and the clamp 210 while maintaining the overall strength of the composite tube body 100.

[0049] Continuing with FIG2 , the conical inner cavity 222 of the hollow body 220 is provided with a plurality of annular grooves 223. The annular grooves 223 are arranged along the circumference of the hollow body 220 and are spaced apart along the axial direction of the hollow body 220. The annular grooves 223 can be rectangular grooves or grooves of other shapes. A sealing ring is disposed within the annular grooves 223 to seal the composite pipe body 100 and the hollow body 220, preventing leakage of compressed air.

[0050] In one embodiment, two annular grooves 223 are each provided on the first tapered inner cavity 2221 and the second tapered inner cavity 2222. When two adjacent composite tubes 100 are enclosed and fixed by two clamps 210, they undergo slight displacement and deformation when subjected to axial tension. This deformation improves sealing performance, and in combination with the sealing ring, a better seal can be achieved. Furthermore, the greater the axial tension borne by the composite tube 100, the better the sealing performance between the composite tube 100 and the hollow body 220.

[0051] 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 have several annular grooves, which are not limited here.

[0052] As shown in Figures 3 and 6 , the connecting portion 230 is provided with a strip groove 232 on the radial end surface of the hollow body 220. The strip groove 232 extends along the axis of the hollow body 220. When the two clamps 210 are connected, a sealing strip is provided in the strip groove 232, which seals the two clamps 210 together. This prevents moisture, impurities, etc. from entering the connection between the two adjacent composite pipe bodies 100 and corroding the inner cavity of the composite pipe bodies 100. It also prevents compressed air inside the composite pipe 10 from leaking between the connecting surfaces of the clamps 210 and causing energy loss. Several strip grooves 232 are provided at intervals along the radial direction of the hollow body 220. Multiple strip grooves 232 can better perform the sealing function.

[0053] 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 wrapped around the outer circumference of two adjacent composite pipe bodies and fixedly connected by fasteners, so that the two adjacent composite pipe bodies are sealed and connected. A sealing ring is provided between the composite pipe body and the connector to ensure a sealed connection between the composite pipe body and the connector, which on the one hand ensures the reliability of the connection and on the other hand prevents 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. 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 caused 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 connector has a simple structure and is easy to operate, which can meet the requirements of rapid installation of on-site projects.

[0054] The technical content and features of this application have been disclosed above. However, it is understood that, based on the creative ideas of this application, those skilled in the art may make various changes and improvements to the above-mentioned structures and materials, including combinations of the technical features disclosed or claimed herein, and obviously including other combinations of these features. Such variations and / or combinations fall within the technical field involved in this application and fall within the scope of protection of the claims of this application.

Claims

1. A composite pipeline, characterized in that, The composite pipeline includes several sections of composite pipe bodies and connectors for fixedly connecting adjacent two sections of the composite pipe bodies. The connector includes two connected clamps. 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 fixedly matched with the cylindrical section, and the conical inner cavity is fixedly matched with the conical section. After the two clamps are wrapped around the outer periphery of the connection part of adjacent two sections of the composite pipe bodies, they are butted and fixedly connected through the connecting portion.

2. The composite pipeline according to claim 1, wherein In the radial direction of the hollow body, the connecting portion extends away from the hollow body along the edge side of the hollow body, and two such connecting portions are symmetrically arranged on both sides of the hollow body.

3. The composite pipeline according to claim 2, wherein, The connection surface where the two clamps are butted is located on the axial section of the composite pipe body.

4. The composite pipeline according to claim 2, characterized in that, A number of through holes are provided on the connecting portion. After the connecting portions of the two clamps are correspondingly matched, the two clamps are fixedly connected by passing fasteners through the through holes.

5. The composite pipeline according to claim 2, characterized in that, A strip-shaped groove is provided on the connecting portion, and a sealing strip is arranged in the strip-shaped groove.

6. The composite pipeline according to claim 1, wherein, The cylindrical inner cavity includes a first cylindrical inner cavity, a second cylindrical inner cavity and a third cylindrical inner cavity. 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.

7. The composite pipeline according to claim 6, wherein Adjacent two sections of the composite pipe bodies 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. 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. 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.

8. The composite pipeline according to claim 7, wherein Two clamps are wrapped around the outer periphery after the first composite pipe body and the second composite pipe body are butted to fixedly connect the first composite pipe body and the second composite pipe body. The first cylindrical section is fixedly matched with the first cylindrical inner cavity, the first conical section is fixedly matched with the first conical inner cavity, the second cylindrical section and the third cylindrical section are butted and then fixedly matched with the second cylindrical inner cavity, the second conical section is fixedly matched with the second conical inner cavity, and the fourth cylindrical section is fixedly matched with the third cylindrical inner cavity.

9. The composite pipeline according to claim 7, characterized in that, The inner diameter of the second cylindrical section is larger than that of the first cylindrical section, and the inner diameter of the third cylindrical section is larger than that of the fourth cylindrical section.

10. The composite pipeline according to claim 1, characterized in that, A number of annular grooves are provided in the conical inner cavity, and the annular grooves are arranged along the circumferential direction of the hollow body.

11. The composite pipeline according to claim 10, characterized in that, A number of the annular grooves are arranged at intervals along the axial direction of the hollow body, and sealing rings are arranged in the annular grooves.

12. The composite pipeline according to claim 1, characterized in that, The outer diameter of the composite pipe body is slightly larger than the inner diameter of the clamp, and the difference between the outer diameter of the composite pipe body and the inner diameter of the clamp ranges from 0.1 mm to 0.5 mm.

13. The composite pipeline according to claim 1, characterized in that, The composite pipe body is made of a glass fiber reinforced composite material.

14. The composite pipeline according to claim 1, wherein The composite pipe body sequentially includes a first circumferential layer, an axial layer, and a second circumferential layer from the inside to the outside in the radial direction.

15. The composite pipeline according to claim 14, characterized in that, The laying angle of the glass fiber in the first circumferential layer forms a 45° angle with the axis of the composite pipeline, the laying angle of the glass fiber in the second circumferential layer forms a 45° angle with the axis of the composite pipeline, and the inclination direction of the laying angle of the second circumferential layer is opposite to the inclination direction of the laying angle of the first circumferential layer.

16. The composite pipeline according to claim 15, characterized in that, The thickness of the first circumferential layer is equal to the thickness of the second circumferential layer.

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

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