Composite pipe

Abstract

The embodiment of the application provides a composite pipe, which comprises a plurality of sections of composite pipes connected with each other, flanges, clamping rings and hoop members, the flanges are injection molded on one end or both ends of each section of the composite pipes, and the plurality of sections of the composite pipes are connected with each other through the flanges; the flange comprises a connecting section and a sealing section, the connecting section is sleeved on the outer surface of the composite pipe, the sealing section extends beyond the composite pipe along the axial direction of the composite pipe, at least part of the outer peripheral surface of the connecting section is arranged in a tapered manner, the cross-sectional area of the connecting section gradually decreases in the direction away from the sealing section, the outer diameter of the sealing section is equal everywhere and equal to the maximum outer diameter of the connecting section; the clamping ring is pressed on the outer side of the connecting section; and the hoop member movably clamps the clamping ring to lock the clamping ring.

Description

Technical Field

[0001] This application relates to the field of pipe manufacturing technology, and in particular to a composite pipe. Background Technology

[0002] Reinforced thermoplastic pipes (RTP pipes) are a type of high-pressure plastic composite pipe with excellent flexibility, corrosion resistance, high pressure resistance, impact resistance, wear resistance, light weight, easy connection, coiling capability, and rapid long-distance jointless laying. They can effectively overcome the corrosion problems of steel pipes and the pressure resistance problems of plastic pipes, and can be used in oil and gas extraction, high-pressure long-distance transportation of natural gas, and various pipeline fields requiring high-pressure transportation of media.

[0003] However, in practical applications, traditional composite pipes are connected by connecting the ends of the hot-melt pipes. This often results in poor sealing at the connection point, leading to a shorter lifespan for the composite pipes. Summary of the Invention

[0004] The purpose of this application is to provide a composite pipe to solve the problem of poor sealing at the joints of composite pipes, which leads to a short lifespan. The specific technical solution is as follows:

[0005] The composite pipe provided in this application includes multiple interconnected composite pipe segments, flanges, retaining rings, and clamps. The flanges are injection molded onto one or both ends of each composite pipe segment, and the multiple composite pipe segments are connected to each other via the flanges. Each flange includes a connecting segment and a sealing segment. The connecting segment is fitted onto the outer surface of the composite pipe, and the sealing segment extends axially beyond the composite pipe. At least a portion of the outer circumferential surface of the connecting segment is tapered, and the cross-sectional area of ​​the connecting segment gradually decreases away from the sealing segment. The outer diameter of the sealing segment is uniform everywhere and equal to the maximum outer diameter of the connecting segment. The retaining ring is pressed against the outside of the connecting segment. The clamps are movably clamped to the retaining ring for locking the retaining ring.

[0006] In addition, the composite pipe according to the embodiments of this application may also have the following technical features:

[0007] In some embodiments, the connecting segment includes a first tapered segment and a first horizontal segment connected together, the other end of the first horizontal segment being connected to the sealing segment, the outer diameter of the first horizontal segment being equal to the outer diameter of the end where the first tapered segment and the first horizontal segment are connected, and the outer diameter of the sealing segment being equal to the outer diameter of the first horizontal segment.

[0008] In some embodiments, the connecting segment further includes a second horizontal segment connected to the first tapered segment, the outer diameter of the second horizontal segment being equal to the outer diameter of the end where the first tapered segment and the second horizontal segment connect.

[0009] In some embodiments, the flange head further includes an extension section located on the side of the second horizontal section away from the sealing section, the extension section being a second tapered section, and the cross-sectional area of ​​the extension section gradually decreasing in the direction away from the sealing section.

[0010] In some embodiments, along the axial direction of the composite pipe, the length of the flange head is 10% to 20% of the outer diameter of the composite pipe, and the lengths of the sealing section, the first horizontal section, the first tapered section, and the second horizontal section are 20% to 25%, 10% to 12%, 10% to 13%, and 25% to 30% of the length of the flange head, respectively.

[0011] In some embodiments, the outer side of the retaining ring includes a limiting step, the clamp is sleeved on the outer side of the retaining ring and cooperates with the limiting step, and the clamps of the flanges of two adjacent sections of the composite pipe are connected to lock the two connected flanges.

[0012] In some embodiments, the retaining ring includes a first connector, a first set of plates, and a second set of plates; the first set of plates has a first connecting hole at each end, and the second set of plates has a second connecting hole at each end corresponding to the first connecting hole; the first connector passes through the first connecting hole and the second connecting hole to connect the first set of plates and the second set of plates; the clamping member includes a second connector, a first clamping plate, and a second clamping plate; the first clamping plate has a third connecting hole at each end, and the second clamping plate has a fourth connecting hole at each end corresponding to the third connecting hole; the second connector passes through the third connecting hole and the fourth connecting hole to connect the first clamping plate and the second clamping plate.

[0013] In some embodiments, the arc lengths of the first group of sheets and the second group of sheets are equal.

[0014] In some embodiments, the first clamping plate and the second clamping plate have the same arc length.

[0015] In some embodiments, the end face of the sealing section is provided with at least one water-stop ring.

[0016] In some embodiments, the composite tube includes a first plastic tube layer, a reinforcing layer, and a second plastic tube layer. The reinforcing layer covers the outer surface of the first plastic tube layer and includes multiple strips. Each strip includes multiple reinforcing filaments arranged in the same direction. The multiple reinforcing filaments are impregnated in a first adhesive and bonded together. The outer surface of the strips is covered with the first adhesive. Each strip is spirally wound around the outer surface of the first plastic tube layer, and adjacent strips cross each other. The second plastic tube layer covers the outer surface of the reinforcing layer, and the first plastic tube layer and the second plastic tube layer are bonded together by the first adhesive on the surface of the strips.

[0017] In some embodiments, the first plastic tube layer is connected to the flange head and has a chamfer at the end away from the second plastic tube layer.

[0018] In this embodiment, a flange is used to connect two composite pipes. Dividing the flange into a connecting section and a sealing section allows it to simultaneously perform both sealing and connecting functions. The flange is connected to one end of the composite pipe using an injection molding process. Therefore, the stress-bearing part of the composite pipe during connection is the entire injection-molded surface of the flange and the composite pipe, making the composite pipe less prone to separation during connection. Furthermore, connecting the composite pipes using a flange improves the efficiency of the connection and installation. Additionally, at least a portion of the circumferential surface of the connecting section of the flange is tapered. Therefore, the force acting on the flange can be decomposed into radial tension and axial compressive force through angular decomposition. The axial compressive force can tighten the sealing section of the flange, preventing deformation and leakage, and further enhancing the sealing effect. To ensure a tight connection between the two composite pipe sections, a retaining ring and a clamp are also provided on the composite pipe. The retaining ring is pressed against the outside of the connecting section, providing a tightening effect on the flange. The cross-sectional area of ​​the connecting section gradually decreases away from the sealing section, ensuring that the axial force after decomposition of the snap ring applied to the tapered part of the connecting section is directed towards the sealing section. This allows the decomposed axial clamping force to press against the sealing section of the flange head, preventing deformation and leakage of the flange head and improving the sealing of the flange head.

[0019] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0021] Figure 1This is a schematic diagram showing the connection of two composite pipes provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the segmentation of a flange head provided in an embodiment of this application;

[0023] Figure 3 A schematic diagram showing the clamping ring pressed against the flange head to form a pressing surface, as provided in an embodiment of this application;

[0024] Figure 4 A schematic diagram showing the connection between the two flange heads provided in this embodiment of the application, which is a polygonal water-stop ring;

[0025] Figure 5 An enlarged view of the connection between the flange head and the composite pipe provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of a strip formed from untwisted reinforcing yarns, as provided in an embodiment of this application.

[0027] Figure 7 A schematic diagram of cross-winding of strip formed by untwisted reinforcing yarns provided in an embodiment of this application;

[0028] Figure label:

[0029] Composite pipe 10; first plastic pipe layer 11; chamfer 111; reinforcing layer 12; strip 120; reinforcing wire 121; cross-wrap angle a; first adhesive 122; second plastic pipe layer 13; flange head 20; connecting section 21; first horizontal section 210; first tapered section 211; sealing section 22; water-stop ring 220; sealing element 221; second horizontal section 231; extension section 232; retaining ring 30; first set of plates 301; second set of plates 302; limiting step 31; first pressing surface 311; second pressing surface 312; third pressing surface 313; clamp 40. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0031] The composite pipes provided in the embodiments of this application, such as Figure 1 and Figure 2As shown, the assembly includes multiple interconnected composite pipe segments 10, flange heads 20, retaining rings 30, and clamping members 40. The flange heads 20 are injection molded onto one or both ends of each composite pipe segment 10. The multiple composite pipe segments 10 are connected to each other via the flange heads 20. The flange head 20 includes a connecting section 21 and a sealing section 22. The connecting section 21 is fitted onto the outer surface of the composite pipe 10, and the sealing section 22 extends axially beyond the composite pipe 10. At least a portion of the outer circumferential surface of the connecting section 21 is tapered, and the cross-sectional area of ​​the connecting section 21 gradually decreases away from the sealing section 22. The outer diameter of the sealing section 22 is uniform everywhere and equal to the maximum outer diameter of the connecting section 21. The retaining ring 30 is pressed against the outside of the connecting section 21. The clamping member 40 movably clamps the retaining ring 30 to lock the retaining ring 30.

[0032] In this embodiment, the flange head 20 is used to connect two composite pipes 10. Dividing the flange head 20 into a connecting section 21 and a sealing section 22 allows it to simultaneously perform both sealing and connecting functions. The flange head 20 is connected to one end of the composite pipe 10 using an injection molding process. Therefore, the stress-bearing part of the composite pipe 10 during connection is the entire injection-molded surface of the flange head 20 and the composite pipe 10, making it less prone to separation during connection. Furthermore, connecting the composite pipe 10 using the flange head 20 improves the connection and installation efficiency. To ensure a tight connection between the two composite pipe sections 10, a retaining ring 30 and a clamping fitting 40 are also provided on the composite pipe 10. The retaining ring 30 is pressed against the outside of the connecting section 21, providing a tightening effect on the flange head 20. The cross-sectional area of ​​the connecting section 21 gradually decreases away from the sealing section 22, ensuring that the axial force applied by the retaining ring 30 to the tapered portion of the connecting section 21 after decomposition is directed towards the sealing section 22. This allows the decomposed axial clamping force to effectively compress the sealing section 22 of the flange head 20, preventing deformation and leakage of the flange head 20 and improving its sealing performance. The clamp 40 clamps the retaining ring 30, and the force applied to the retaining ring 30 further compresses the flange head 20, further improving its sealing performance. Furthermore, the connection of the two composite pipe sections 10 via the clamp 40 makes the connection of the composite pipe 10 quicker and saves installation time.

[0033] Specifically, such as Figure 1 As shown, the shape of the inner circumferential surface of the retaining ring 30 can be adapted to the shape of the outer circumferential surface of the flange head 20, so that the retaining ring 30 can be firmly attached to the flange head 20. The retaining ring 30 can be designed as a hollow structure. Under the force of the clamping member 40, the retaining ring 30 tends to deform at the center of the cross-section of the composite pipe 10, further increasing the circumferential outward pressure of the flange head 20, which counteracts the internal pressure borne by the flange head 20, thus completing the sealing function of the sealing section 22 of the flange head 20. This results in higher sealing pressure and better sealing performance at the connection of the composite pipe 10.

[0034] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the connecting section 21 includes a first tapered section 211 and a first horizontal section 210 connected to each other. The other end of the first horizontal section 210 is connected to the sealing section 22. The outer diameter of the first horizontal section 210 is equal to the outer diameter of the end where the first tapered section 211 and the first horizontal section 210 are connected. The outer diameter of the sealing section 22 is equal to the outer diameter of the first horizontal section 210.

[0035] In this embodiment, since the connecting section 21 is provided with a first horizontal section 210, the direction of the force exerted by the retaining ring 30 on the first horizontal section 210 is perpendicular to the axial direction of the composite pipe 10. The force exerted by the retaining ring 30 on the first horizontal section 210 can firmly press the flange head 20 and the composite pipe 10 together. The setting that the outer diameter of the sealing section 22 is equal to the outer diameter of the first horizontal section 210 makes the flatness of the connection between the connecting section 21 and the sealing section 22 of the flange head 20 higher, making it easier to install the retaining ring 30 on the flange head 20, and the force at the connection between the connecting section 21 and the sealing section 22 is more uniform. In addition, the first horizontal section 210 of the flange head 20 is connected to the first tapered section 211. When the retaining ring 30 is pressed against the first tapered section 211, the force acting on the first tapered section 211 is decomposed into radial tension and axial clamping force through angle decomposition. The axial clamping force can press the sealing section 22 of the flange head 20 to prevent the flange head 20 from deforming and leaking, which is more conducive to the sealing of the flange head 20.

[0036] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the connecting segment 21 also includes a second horizontal segment 231, which is connected to the first tapered segment 211. The outer diameter of the second horizontal segment 231 is equal to the outer diameter of the end where the first tapered segment 211 and the second horizontal segment 231 are connected.

[0037] In this embodiment of the application, a second horizontal section 231 is connected to the end of the first tapered section 211 away from the first horizontal section 210. The setting of the second horizontal section 231 can increase the connection area between the flange head 20 and the composite pipe 10, increase the bonding strength between the flange head 20 and the composite pipe 10, improve the axial tensile stress of the flange head 20, and thus improve the connection strength between the flange head 20 and the composite pipe 10, so that the flange head 20 is more firmly fixed on the composite pipe 10.

[0038] It should be noted that, as Figure 1 and Figure 2As shown, since the outer diameter of the first horizontal section 210 is equal to the outer diameter of the first tapered section 211 at the connection, and the outer diameter of the second horizontal section 231 is equal to the outer diameter of the first tapered section 211 at the connection, the upper surfaces of the first horizontal section 210 and the second horizontal section 231 are set with a gradient difference in height. When the retaining ring 30 is engaged with the outside of the connecting section 21, the gradient difference allows the retaining ring 30 to generate an axial clamping force. The axial clamping force can clamp the sealing section 22 of the flange head 20, preventing deformation and leakage of the flange head 20, and further improving the sealing of the flange head 20.

[0039] In the embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the retaining ring 30 is pressed onto the first horizontal section 210 to form a first pressing surface 311, pressed onto the first tapered section 211 to form a second pressing surface 312, and pressed onto the second horizontal section 231 to form a third pressing surface 313. This allows the retaining ring 30 to provide a wrapping reinforcement to the flange head 20, overcoming the creep effect of the flange head 20 in the later stages.

[0040] In some embodiments of this application, the flange head 20 further includes an extension section 232 disposed on the side of the second horizontal section 231 away from the sealing section 22. The extension section 232 is a second tapered section, and the cross-sectional area of ​​the extension section 232 gradually decreases in the direction away from the sealing section 22.

[0041] In this embodiment, the extension section 232 further increases the connection area between the flange head 20 and the composite pipe 10, thereby further increasing the connection strength between the flange head 20 and the composite pipe 10 and improving the service life of the composite pipe. Additionally, setting the extension section 232 as a second tapered section reduces stress concentration at right angles and prevents impact when the retaining ring 30 is fitted onto the flange head 20.

[0042] In some embodiments of this application, along the axial direction of the composite pipe 10, the length of the flange head 20 is 10% to 20% of the outer diameter of the composite pipe 10, and the lengths of the sealing section 22, the first horizontal section 210, the first tapered section 211, and the second horizontal section 231 are 20% to 25%, 10% to 12%, 10% to 13%, and 25% to 30% of the length of the flange head 20, respectively.

[0043] In this embodiment, the force generated by the flange head 20 in conjunction with the composite pipe 10 must be greater than the tensile stress borne by the composite pipe 10, making it less likely for the flange head 20 to detach from the composite pipe 10 during the connection process. The specific length of the flange head 20 is determined based on the pressure rating and dimensions of the composite pipe 10, calculating the tensile stress that the composite pipe 10 must withstand. In practical applications, the length of the flange head 20 along the axial direction of the composite pipe 10 can be 10%, 15%, or 20% of the outer diameter of the composite pipe 10.

[0044] In some embodiments of this application, such as Figure 1 As shown, the outer side of the retaining ring 30 includes a limiting step 31, and the clamp 40 is sleeved on the outer side of the retaining ring 30 and cooperates with the limiting step 31. The clamps 40 of the flange heads 20 of two adjacent composite pipe sections 10 are connected to lock the two connected flange heads 20.

[0045] In this embodiment, by setting a limiting step 31 on the outside of the retaining ring 30, the clamping member 40 can be more accurately and quickly fitted onto the outside of the retaining ring 30. The force of the clamping member 40 acting on the limiting step 31 includes axial clamping force and radial force. The axial clamping force can further clamp the two adjacent flange heads 20, and the radial force can make the flange heads 20 more securely fixed on the composite pipe 10.

[0046] In some embodiments of this application, such as Figure 1 As shown, the retaining ring 30 includes a first connecting member (not shown), a first set of plates 301, and a second set of plates 302; the first set of plates 301 has a first connecting hole (not shown) at both ends, and the second set of plates 302 has a second connecting hole (not shown) at both ends corresponding to the first connecting hole; the first connecting member passes through the first connecting hole and the second connecting hole to connect the first set of plates 301 and the second set of plates 302; the clamping member 40 includes a second connecting member (not shown), a first clamping plate (not shown), and a second clamping plate (not shown); the first clamping plate has a third connecting hole (not shown) at both ends, and the second clamping plate has a fourth connecting hole (not shown) at both ends corresponding to the third connecting hole; the second connecting member passes through the third connecting hole and the fourth connecting hole to connect the first clamping plate and the second clamping plate.

[0047] In this embodiment, when the retaining ring 30 is installed on the connecting section 21 of the flange head 20, the first set of plates 301 and the second set of plates 302 can be abutted against the outside of the connecting section 21, with the first connecting hole facing the second connecting hole. Then, the first connecting member is passed through the first connecting hole and the second connecting hole respectively, connecting the first set of plates 301 and the second set of plates 302, thereby successfully fixing the retaining ring 30 onto the flange head 20. Similarly, with the first set of plates 301 and the second set of plates 302, when the clamping member 40 is installed on the outside of the retaining ring 30, the first clamping plate and the second clamping plate can be abutted against the outside of the retaining ring 30, with the third connecting hole facing the fourth connecting hole. Then, the second connecting member is passed through the third connecting hole and the fourth connecting hole respectively, connecting the first clamping plate and the second clamping plate, thereby successfully fixing the clamping member 40 on the outside of the retaining ring 30. The arrangement of the first set of plates 301 and the second set of plates 302, and the first clamping plate and the second clamping plate, makes the disassembly and installation between the two composite pipe sections 10 more convenient.

[0048] Specifically, the first, second, third, and fourth connecting holes are all threaded holes, and the first and second connecting parts are bolts. The arc lengths of the first set of plates 301 and the second set of plates 302 can be equal or unequal, and the arc lengths of the first clamping plate and the second clamping plate can also be equal or unequal. More specifically, the first clamping plate and the second clamping plate can be steel frame clamping plates, and the steel frame clamping plates can be hollow structures.

[0049] In some embodiments of this application, the arc lengths of the first group of sheets 301 and the second group of sheets 302 are equal.

[0050] In this embodiment, since the arc lengths of the first set of plates 301 and the second set of plates 302 are equal, the first set of plates 301 and the second set of plates can be mass-produced, and the replacement of parts is more convenient. Furthermore, the equal arc lengths of the first set of plates 301 and the second set of plates 302 make the force on the first set of plates 301 and the second set of plates 302 more uniform, thereby extending the service life of the first set of plates 301 and the second set of plates 302.

[0051] In some embodiments of this application, the arc lengths of the first clamping plate and the second clamping plate are equal.

[0052] In this embodiment, since the first clamping plate and the second clamping plate have equal arc lengths, the first clamping plate and the second clamping plate can be mass-produced, and the replacement of parts is more convenient. Furthermore, the equal arc lengths of the first clamping plate and the second clamping plate make the first clamping plate and the second clamping plate more uniform, thereby extending the service life of the first clamping plate and the second clamping plate.

[0053] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 4As shown, at least one water-stop ring 220 is provided on the end face of the sealing section 22.

[0054] In this embodiment of the application, a water-stop ring 220 for placing a seal 221 is provided on the end face of the sealing section 22 of the flange head 20 to eliminate the gaps existing in the rigid connection between the sealing sections 22, thereby making the sealing effect of the sealing section 22 better.

[0055] Specifically, such as Figure 1 and Figure 4 As shown, the cross-section of the water-stop ring 220 in this embodiment can be "V" shaped, and the number of "V" shaped water-stop rings 220 can be three. Among them, the sealing element 221 can be a "V" shaped sealing ring whose shape is adapted to the "V" shaped water-stop ring 220. The "V" shaped sealing ring is clamped and connected by a set of adjacent flange heads 20, and a seal is formed by the "V" shaped water-stop ring 220 on the end face of the flange head 20.

[0056] The cross-section of the water-stop ring 220 can also be polygonal. The sealing element 221 can be a polygonal sealing element 221 adapted to the shape of the polygonal water-stop ring 220. The polygonal sealing elements 221 are clamped together by a set of adjacent flange heads 20, forming a seal through the polygonal sealing elements 221 on the end faces of the flange heads 20. More specifically, such as... Figure 4 As shown, the polygonal seal 221 can be a hexagonal sealing ring.

[0057] In some embodiments of this application, such as Figure 5 , Figure 6 and Figure 7 As shown, the composite tube 10 includes a first plastic tube layer 11, a reinforcing layer 12, and a second plastic tube layer 13. The reinforcing layer 12 covers the outer surface of the first plastic tube layer 11 and includes multiple strips 120. Each strip 120 includes multiple reinforcing filaments 121 arranged in the same direction. The multiple reinforcing filaments 121 are impregnated in a first adhesive liquid 122 and bonded together. The outer surface of the strips 120 is covered with the first adhesive liquid 122. Each strip 120 is spirally wound around the outer surface of the first plastic tube layer 11, and adjacent strips 120 cross each other. The second plastic tube layer 13 covers the outer surface of the reinforcing layer 12. The first plastic tube layer 11 and the second plastic tube layer 13 are bonded together by the first adhesive liquid 122 on the surface of the strips 120.

[0058] In this embodiment, the composite pipe 10 includes a first plastic pipe layer 11, a second plastic pipe layer 13, and a reinforcing layer 12 disposed between the two. The reinforcing layer 12 significantly improves the tensile and compressive strength of the composite pipe 10. The reinforcing layer 12 is composed of multiple strips 120, which are wound around the outer surface of the first plastic pipe layer 11, with adjacent strips 120 intersecting each other. In this embodiment, the intersecting winding of adjacent strips 120 makes the stress on the entire reinforcing layer 12 more uniform, preventing the reinforcing layer 12 from being stressed in only one direction when the strips 120 are wound unidirectionally around the first plastic pipe layer 11, thus avoiding the problem of the strips 120 unwinding in the opposite direction when the composite pipe 10 is under pressure. Specifically, as follows... Figure 6 As shown, each strip 120 is composed of multiple reinforcing wires 121 arranged in the same direction. The arrangement of the reinforcing wires 121 in the same direction makes the force on the reinforcing wires 121 the same and more uniform. More specifically, the multiple reinforcing wires 121 can be arranged in the same direction along the axial direction of the composite tube 10 to improve the axial tensile strength and bending strength of the composite tube 10. Multiple reinforcing filaments 121 are impregnated in the first adhesive liquid 122 to form a strip 120. A layer of the first adhesive liquid 122 is automatically attached to the surface of the strip 120 formed by impregnation. When the strip 120 is wound around the first plastic tube layer 11, and when the second plastic tube layer 13 is wrapped around the reinforcing layer 12 through the wrapping mold, the first adhesive liquid 122 can play the role of bonding the first plastic tube layer 11 and the second plastic tube layer 13. Therefore, during the use of the composite pipe, the reinforcing layer 12 is less likely to separate from the first plastic tube layer 11 and the second plastic tube layer 13. While improving the tensile and compressive strength of the composite pipe, the overall consistency of the composite pipe is greatly improved, and the service life of the composite pipe is extended.

[0059] In this embodiment, the reinforcing filament 121 can be made of aramid fiber, basalt fiber, polyester fiber, glass fiber, or metal wire.

[0060] In some embodiments of this application, such as Figure 5 As shown, the first plastic pipe layer 11 is connected to the flange head 20 and has a chamfer 111 at the end away from the second plastic pipe layer 13.

[0061] In this embodiment, the flange head 20 is injection molded into the composite pipe 10 and fused together with it. Since only the end face of the first plastic pipe layer 11 is connected to the flange head 20 during injection molding, the chamfer 111 increases the contact area between the flange head 20 and the first plastic pipe layer 11, thereby improving the connection strength between them. Furthermore, the chamfer 111 also prevents internal stress caused by the right-angle design of the first plastic pipe layer 11, thus avoiding breakage at the right angle.

[0062] In some embodiments of this application, such as Figure 7 As shown, the cross-wrap angle α between two adjacent strips 120 is 40° to 100°.

[0063] In this embodiment, a cross-winding angle α between the two strips 120 is 40° to 100° to better balance the longitudinal and transverse tensions of the strips 120. For example, the cross-winding angle α can be 40°, 55°, 70°, 85°, and 100°. Furthermore, when the cross-winding angle α is 50°-60°, the reinforcing layer 12 formed by winding the strips 120 has a better reinforcing effect.

[0064] In some embodiments of this application, the material of the first adhesive liquid 122 is PE adhesive. In the embodiments of this application, PE adhesive has good adhesion, corrosion resistance and good toughness. Under the premise of firmly bonding the reinforcing filament 121, it can have better toughness and is easy to process and shape.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A composite pipe, characterized in that, include: A composite pipe with multiple interconnected segments (10); Flanges (20) are injection molded at one or both ends of each composite pipe (10), and multiple composite pipes (10) are connected to each other through the flanges (20); the flange (20) includes a connecting section (21) and a sealing section (22), the connecting section (21) is sleeved on the outer surface of the composite pipe (10), the sealing section (22) extends beyond the composite pipe (10) along the axial direction, at least part of the outer peripheral surface of the connecting section (21) is tapered, and the cross-sectional area of ​​the connecting section (21) gradually decreases in the direction away from the sealing section (22), the outer diameter of the sealing section (22) is equal everywhere, and is equal to the maximum outer diameter of the connecting section (21); A retaining ring (30) is pressed against the outside of the connecting segment (21); the outside of the retaining ring (30) includes a limiting step (31). A clamp (40) is movably clamped to the retaining ring (30) for locking the retaining ring (30); the clamp (40) is sleeved on the outside of the retaining ring (30) and cooperates with the limiting step (31); the clamps (40) of the flange heads (20) of two adjacent sections of the composite pipe (10) are connected to lock the two connected flange heads (20). The connecting segment (21) includes a first horizontal segment (210), a first tapered segment (211), and a second horizontal segment (231) connected in sequence. The first pressing surface (311) of the retaining ring (30) is pressed against the first horizontal segment (210), the second pressing surface (312) is pressed against the first tapered segment (211), and the third pressing surface (313) is pressed against the second horizontal segment (231).

2. The composite pipe according to claim 1, characterized in that, The other end of the first horizontal segment (210) is connected to the sealing segment (22). The outer diameter of the first horizontal segment (210) is equal to the outer diameter of the first tapered segment (211) and the end where the first horizontal segment (210) is connected. The outer diameter of the sealing segment (22) is equal to the outer diameter of the first horizontal segment (210).

3. The composite pipe according to claim 2, characterized in that, The outer diameter of the second horizontal segment (231) is equal to the outer diameter of the end where the first tapered segment (211) and the second horizontal segment (231) are connected.

4. The composite pipe according to claim 3, characterized in that, The flange head (20) further includes an extension section (232) located on the side of the second horizontal section (231) away from the sealing section (22), the extension section (232) being a second tapered section, and the cross-sectional area of ​​the extension section (232) gradually decreasing in the direction away from the sealing section (22).

5. The composite pipe according to claim 4, characterized in that, Along the axial direction of the composite pipe (10), the length of the flange head (20) is 10% to 20% of the outer diameter of the composite pipe (10), and the lengths of the sealing section (22), the first horizontal section (210), the first tapered section (211), and the second horizontal section (231) are 20% to 25%, 10% to 12%, 10% to 13%, and 25% to 30% of the length of the flange head (20), respectively.

6. The composite pipe according to any one of claims 1-5, characterized in that, The retaining ring (30) includes a first connector, a first set of pieces (301) and a second set of pieces (302); the first set of pieces (301) is provided with a first connecting hole at both ends, and the second set of pieces (302) is provided with a second connecting hole at both ends corresponding to the first connecting hole; the first connector passes through the first connecting hole and the second connecting hole to connect the first set of pieces (301) and the second set of pieces (302); The clamping member (40) includes a second connector, a first clamping piece, and a second clamping piece; the first clamping piece has a third connecting hole at both ends, and the second clamping piece has a fourth connecting hole at both ends corresponding to the third connecting hole; the second connector passes through the third connecting hole and the fourth connecting hole to connect the first clamping piece and the second clamping piece.

7. The composite pipe according to claim 6, characterized in that, The arc lengths of the first group of pieces (301) and the second group of pieces (302) are equal.

8. The composite pipe according to claim 6, characterized in that, The first clamp plate and the second clamp plate have the same arc length.

9. The composite pipe according to any one of claims 1-5, characterized in that, The end face of the sealing section (22) is provided with at least one water-stop ring (220).

10. The composite pipe according to any one of claims 1-5, characterized in that, The composite pipe (10) includes: First plastic tube layer (11); A reinforcing layer (12) is formed on the outer surface of the first plastic tube layer (11). The reinforcing layer (12) includes multiple strips (120), each strip (120) including multiple reinforcing filaments (121) arranged in the same direction. The multiple reinforcing filaments (121) are immersed in a first adhesive liquid (122) and bonded together. The outer surface of the strips (120) is covered with the first adhesive liquid (122). Each strip (120) is spirally wound around the outer surface of the first plastic tube layer (11), and adjacent strips (120) intersect each other. The second plastic tube layer (13) covers the outer surface of the reinforcing layer (12), and the first plastic tube layer (11) and the second plastic tube layer (13) are bonded together by the first adhesive liquid (122) on the surface of the strip (120).

11. The composite pipe according to claim 10, characterized in that, The first plastic tube layer (11) is connected to the flange head (20) and has a chamfer (111) at the end away from the second plastic tube layer (13).

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