Composite pipe and method for manufacturing a composite pipe

Abstract

The embodiment of the present application provides a kind of composite pipe and the production method of composite pipe, composite pipe includes multiple mutually connected composite pipes, and the composite pipe includes: first plastic pipe layer, reinforcing layer and second plastic pipe layer, reinforcing layer is covered in the outer surface of first plastic pipe layer, and reinforcing layer includes multiple tapes, each tape includes multiple reinforcing filaments arranged in the same direction, multiple reinforcing filaments are soaked in first adhesive glue liquid and bonded together, and the outer surface of tape is covered with first adhesive glue liquid, each tape is spirally wound on the outer surface of first plastic pipe layer, and adjacent two tapes are crossed with each other;Second plastic pipe layer is covered in the outer surface of reinforcing layer, and first plastic pipe layer and second plastic pipe layer are bonded by the first adhesive glue liquid on the surface of tape.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe production, in particular to a composite pipe and a manufacturing method thereof. BACKGROUND

[0002] The composite pipe is a pipe based on a composite structure of metal and thermoplastic plastic, and is formed by lining with non-metallic materials such as polypropylene, polyethylene or outer-welded cross-linked polyethylene, and has the advantages of metal pipes and non-metal pipes. The composite pipe generally also has a reinforcing layer, which can improve the strength of the pipe.

[0003] The existing composite pipe is prone to separation of the reinforcing layer from the inner pipe or the outer pipe during long-term use, thereby damaging the overall consistency of the composite pipe and shortening the service life of the composite pipe. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a composite pipe and a manufacturing method thereof, to solve the problem that the reinforcing layer is prone to separation from the inner pipe or the outer pipe, thereby reducing the service life of the composite pipe. The specific technical solutions are as follows:

[0005] The composite pipe provided by the embodiments of the present application comprises: a plurality of composite pipes connected to each other, wherein the composite pipe comprises: a first plastic pipe layer, a reinforcing layer and a second plastic pipe layer, the reinforcing layer is coated on the outer surface of the first plastic pipe layer, the reinforcing layer comprises a plurality of tapes, each tape comprises a plurality of reinforcing filaments arranged in the same direction, the plurality of reinforcing filaments are soaked in a first adhesive glue liquid to be bonded together, and the outer surface of each tape is covered with the first adhesive glue liquid, each tape is spirally wound on the outer surface of the first plastic pipe layer, and adjacent two tapes are crossed with each other; the second plastic pipe layer is coated on the outer surface of the reinforcing layer, and the first plastic pipe layer and the second plastic pipe layer are bonded by the first adhesive glue liquid on the surface of the tape.

[0006] In addition, the composite pipe according to the first aspect of the present application can also have the following technical features:

[0007] In some embodiments, the tape is twisted from a plurality of reinforcing filaments arranged in the same direction.

[0008] In some embodiments, the reinforcing filaments are metal wires, and the diameter of the metal wires is less than or equal to 0.5 mm.

[0009] In some embodiments, the metal wires are steel wires.

[0010] In some embodiments, the crossing angle between adjacent two tapes is 40° to 100°.

[0011] In some embodiments, the material of the first adhesive solution is PE glue.

[0012] In some embodiments, the first plastic pipe layer and the second plastic pipe layer are thermoplastic polyolefin materials.

[0013] In some embodiments, each of the composite pipes is provided with an injection-molded flange head at one end or both ends, and the plurality of the composite pipes are connected to each other through the flange heads.

[0014] In some embodiments, the flange head comprises a connecting section and a sealing section, the connecting section is sleeved on the outer surface of the composite pipe, and the sealing section extends beyond the composite pipe in the axial direction of the composite pipe.

[0015] In some embodiments, at least part of the outer circumferential surface of the connecting section is tapered, and the cross-sectional area of the connecting section gradually increases in the direction close to the sealing section, the outer diameter of the sealing section is equal everywhere and equal to the maximum outer diameter of the connecting section.

[0016] In some embodiments, the flange head further comprises an extension section provided at the free end of the connecting section, the outer diameter of the extension section is smaller than that of the connecting section, and the extension section comprises a first section and a second section, the first section connects the connecting section and the second section, the outer diameter of the first section is equal everywhere and equal to the minimum outer diameter of the connecting section, and the outer circumferential surface of the second section is tapered.

[0017] In some embodiments, the outer side of each flange head is provided with a snap ring and a hoop member, the snap ring is pressed on the outer side of the first section and the connecting section, the outer side of the snap ring comprises a limiting step, the hoop member is sleeved on the outer side of the snap ring and cooperates with the limiting step, and the hoop members of the flange heads of two adjacent composite pipes are connected to lock the two connected flange heads.

[0018] In some embodiments, in 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 connecting section and the first section are 20% to 25%, 20% to 25% and 25% to 30% of the length of the flange head, respectively.

[0019] In some embodiments, the end surface of the sealing section is provided with at least one "V"-shaped water stop ring.

[0020] In some embodiments, the end of the first plastic pipe layer away from the second plastic pipe layer and connected to the flange head is provided with a chamfer.

[0021] Embodiments of the second aspect of the present application provide a manufacturing method of a composite pipe, for manufacturing any of the composite pipes, comprising:

[0022] The first plastic pipe layer and the second plastic pipe layer are made by injection molding.

[0023] A plurality of reinforcing filaments are arranged in the same direction and are impregnated in the first adhesive liquid to be bonded together to form a tape, and the outer surface of the tape is covered with the first adhesive liquid. Each of the tapes is spirally wound on the outer surface of the first plastic pipe layer to form a reinforcing layer of the composite pipe, and the adjacent two tapes cross each other.

[0024] The second plastic pipe layer is further wrapped on the outer surface of the reinforcing layer, and the first plastic pipe layer and the second plastic pipe layer are bonded by the first adhesive liquid on the surface of the tape.

[0025] In some embodiments, the reinforcing filaments are twisted and impregnated in the first adhesive liquid to form the tape.

[0026] In the embodiments of the present application, the composite pipe comprises a first plastic pipe layer, a second plastic pipe layer, and a reinforcing layer arranged therebetween. The arrangement of the reinforcing layer can greatly improve the tensile and compressive properties of the composite pipe. The reinforcing layer is composed of a plurality of tapes, which are spirally wound on the outer surface of the first plastic pipe layer and cross each other between adjacent tapes. In the embodiments of the present application, the cross winding between adjacent tapes can make the stress of the entire reinforcing layer more uniform, preventing the problem of reverse unwinding of the tapes when the composite pipe is under pressure. Specifically, each tape is composed of a plurality of reinforcing filaments arranged in the same direction. The arrangement of the reinforcing filaments in the same direction makes the stress direction of the reinforcing filaments the same and the stress more uniform. More specifically, the plurality of reinforcing filaments can be arranged in the same direction along the axial direction of the composite pipe, improving the axial tensile strength and bending strength of the composite pipe. The plurality of reinforcing filaments are impregnated in the first adhesive liquid to form a tape. The surface of the tape formed by impregnation will automatically have a layer of first adhesive liquid. When the tape is wound on the first plastic pipe layer, and the second plastic pipe layer is wrapped on the reinforcing layer by a wrapping mold, the first adhesive liquid can play a role in bonding the first plastic pipe layer and the second plastic pipe layer. Therefore, during the use of the composite pipe, the reinforcing layer is less likely to separate from the first plastic pipe layer and the second plastic pipe layer. On the premise of improving the tensile and compressive properties of the composite pipe, the overall consistency of the composite pipe is greatly improved, and the service life of the composite pipe is prolonged.

[0027] Of course, implementing any product or method of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to some embodiments of the present application, and other embodiments can be obtained by those skilled in the art based on these drawings.

[0029] Figure 1 A flange head and a composite pipe connection schematic diagram provided for the embodiments of the present application;

[0030] Figure 2 A connection schematic diagram of two composite pipes provided for the embodiments of the present application;

[0031] Figure 3 A tape formed by untwisted reinforcing filaments provided for the embodiments of the present application;

[0032] Figure 4 A cross-wound schematic diagram of the tape formed by untwisted reinforcing filaments provided for the embodiments of the present application;

[0033] Figure 5 An enlarged view of a clasp, a hoop member and a composite pipe connection provided for the embodiments of the present application;

[0034] Figure 6 An enlarged view of a flange head and a composite pipe connection provided for the embodiments of the present application.

[0035] Reference signs:

[0036] Composite pipe 10; first plastic pipe layer 11; chamfer 111; reinforcing layer 12; tape 120; reinforcing filaments 121; cross-wound angle a; first adhesive liquid 122; second plastic pipe layer 13; flange head 20; connection section 21; tapered outer peripheral surface 211; sealing section 22; water stop ring 220; extension section 23; first section 231; second section 232; clasp 30; limiting step 31; first pressing surface 311; second pressing surface 312; third pressing surface 313; hoop member 40. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the present application belong to the protection scope of the present application.

[0038] The embodiments of the first aspect of the present application provide a composite pipe material, such as Figure 1 , Figure 2 and Figure 3As shown, the composite pipe includes multiple interconnected composite pipe sections 10. Each composite pipe 10 includes a first plastic pipe layer 11, a reinforcing layer 12, and a second plastic pipe layer 13. The reinforcing layer 12 covers the outer surface of the first plastic pipe 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 pipe layer 11, and adjacent strips 120 intersect each other. Figure 4 As shown; 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.

[0039] In the embodiments of this application, such as Figure 1 As shown, 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 can greatly improve the tensile and compressive strength of the composite pipe 10. The reinforcing layer 12 is composed of multiple strips 120, which are spirally 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 can make 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 preventing the strips 120 from unwinding in the opposite direction when the composite pipe 10 is under pressure. Specifically, as shown... Figure 3 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.

[0040] In this embodiment, the reinforcing filament 121 can be made of aramid fiber, basalt fiber, polyester fiber, glass fiber, or metal wire.

[0041] In some embodiments of the present application, the tape 120 is twisted from a plurality of reinforcing filaments 121 arranged in the same direction. In the embodiments of the present application, in order to further increase the tensile and compressive properties of the composite pipe 10, the plurality of reinforcing filaments 121 are twisted, and the twisted reinforcing filaments 121 are formed into the tape 120 by the first adhesive glue 122.

[0042] In some embodiments of the present application, the reinforcing filament 121 is a metal filament, and the diameter of the metal filament is less than or equal to 0.5 mm.

[0043] In the embodiments of the present application, the metal filament has stronger tensile properties and is more resistant to high temperatures, so that the reinforcing layer 12 made of the metal filament has better toughness, higher pressure resistance, and is more resistant to high temperatures. In addition, because the metal filament has greater toughness and rigidity, the first plastic pipe layer 11 and the second plastic pipe layer 13 are difficult to damage the reinforcing layer 12 made of the metal filament; moreover, the metal filament does not have a capillary structure, and will not cause a "capillary adsorption" phenomenon to the medium conveyed in the composite pipe, so that the metal filament will not hydrolyze and fail due to the adsorption phenomenon, so that the service life of the reinforcing layer 12 is longer. Specifically, the embodiments can use a metal filament with low rigidity and high elastic modulus, and the tensile stress range is 2400 MPa to 3000 MPa. The low rigidity of the metal filament reflects that the metal fiber is flexible and can be arbitrarily bent and shaped, overcoming the phenomenon that the linear expansion coefficients of the metal and the plastic are different and are forced to separate due to "thermal expansion and cold shrinkage" and the like. The flexible metal fiber has a geometrically increasing specific surface area, and can be closely combined with the first plastic pipe layer 11 and / or the second plastic pipe layer 13, and will not separate from the first plastic pipe layer 11 and / or the second plastic pipe layer 13. The high elastic modulus can provide high tensile stress, and play a role in enhancing the compressive capacity of the composite pipe.

[0044] In addition, the metal filament of the conventional composite pipe is usually wound, welded, or woven from a metal filament with a diameter of 0.5 mm or more. Although the large-diameter metal filament can provide the necessary tensile strength of the pipe, it has the following disadvantages: the strong rigidity causes the metal filament to separate from the first plastic pipe layer 11 and the second plastic pipe layer 13 under thermal expansion and cold shrinkage, and damages the overall consistency of the composite pipe 10; the specific surface area of the thick metal filament is significantly reduced, the adhesion performance with the plastic material is reduced, and the overall consistency of the composite pipe 10 is further affected, and the problem is more and more obvious as the diameter of the metal filament increases. Therefore, the embodiments of the present application use a metal filament with a diameter of less than 0.5 mm as the reinforcing filament.

[0045] In some embodiments of the present application, the metal filament is a steel filament.

[0046] Compared with metal wires of other materials, the steel wire can maintain good toughness under high and low temperature conditions, wherein the cross section of the steel wire can be circular, square or triangular. In addition, a layer of metal or alloy can be plated on the outer surface of the steel wire, so that the steel wire can be further corrosion resistant to improve the service life of the steel wire.

[0047] In some embodiments of the present application, as shown in Figure 4 The intersection winding angle a between the two adjacent tapes 120 is 40° to 100°.

[0048] In some embodiments of the present application, the intersection winding angle a between the two tapes 120 is 40° to 100°, which can better balance the longitudinal and transverse tension of the tape 120. For example, the intersection winding angle a can be 40°, 55°, 70°, 85° and 100°. Further, when the intersection winding angle a is 50°-60°, the reinforcing effect of the reinforcing layer 12 formed by winding the tape 120 is better.

[0049] In some embodiments of the present application, the material of the first adhesive glue 122 is PE glue. In some embodiments of the present application, the PE glue has good adhesive performance, corrosion resistance and good toughness, and can have better toughness under the premise of firmly bonding the reinforcing wire 121, and is easy to process and shape.

[0050] In some embodiments of the present application, the first plastic pipe layer 11 and the second plastic pipe layer 13 are thermoplastic polyolefin materials.

[0051] In some embodiments of the present application, the thermoplastic polyolefin material has excellent elasticity, good mechanical strength and high tensile strength, good acid and alkali resistance, can be suitable for various media, and has low water absorption, so that the composite pipe can maintain stable mechanical properties in a humid environment, thereby improving the service life of the composite material. Specifically, the first plastic pipe layer 11 and the second plastic pipe layer 13 are continuously extruded and formed by a pipe extruder, and the second plastic pipe layer 13 is coated on the reinforcing layer 12 by a coating mold.

[0052] Specifically, the material of the flange head 20 can also be a thermoplastic polyolefin material. The flange head 20 is formed by an injection molding machine and a forming mold, and is fused with the end face of the first plastic pipe layer 11 and the second plastic pipe layer 13 to form. The same material of the flange head 20 and the first plastic pipe layer 11 and the second plastic pipe layer 13 can improve the material consistency of the internal pipe layer of the composite pipe 10, thereby improving the use performance of the composite pipe.

[0053] In some embodiments of the present application, one end or both ends of each section of the composite pipe 10 is provided with an injection molded flange head 20, and multiple sections of the composite pipe 10 are connected by the flange heads 20.

[0054] In the embodiments of the present application, as shown in Figure 2 The composite pipe further comprises a flange head 20 connected with the composite pipe 10. Since the flange head 20 is connected with one end of the composite pipe 10 by the injection molding process, the stress part of the composite pipe 10 during the connection is the entire injection molding surface of the flange head 20 and the composite pipe 10. Compared with the connection mode of only connecting the end surface of the composite pipe 10, the composite pipe 10 is less likely to separate during the connection process, and the flange head 20 makes the connection of the composite pipe 10 simpler, thereby improving the connection and installation efficiency of the composite pipe 10. Specifically, in the embodiments, after the composite pipe 10 is manufactured, the injection molding mold is used to perform injection molding on one end of the composite pipe 10 to form the flange head 20. The flange head 20 formed by the injection molding has the advantages of fast production speed, high efficiency, and optional shape of the flange head 20. In addition, when the composite pipe 10 is connected through the flange head 20, since the flange head 20 covers the end surface of the reinforcing layer 12, the flange head 20 can also play a protective role for the reinforcing layer 12, so that the reinforcing layer 12 is less likely to be corroded.

[0055] In some embodiments of the present application, as shown in Figure 6 The flange head 20 comprises a connecting section 21 and a sealing section 22. The connecting section 21 is sleeved on the outer surface of the composite pipe 10, and the sealing section 22 extends along the axial direction of the composite pipe 10 beyond the composite pipe 10.

[0056] In the embodiments of the present application, the flange head 20 is used to connect two composite pipes 10. Dividing the flange head 20 into the connecting section 21 and the sealing section 22 can make the flange head 20 play a sealing role and a connecting role at the same time. The sealing section 22 extends along the axial direction of the composite pipe 10 beyond the composite pipe 10, that is, the two composite pipes 10 are connected through the sealing section 22 of the flange head 20, rather than the end surface of the composite pipe 10.

[0057] In some embodiments of the present application, as shown in Figure 6 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 increases along the direction close to 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.

[0058] In the embodiments of the present application, at least part of the circumferential surface of the connecting section 21 is tapered, so that the force acting on the flange head 20 can be decomposed into a radial tension and an axial compression force by angle decomposition, and the axial compression force can compress the sealing section 22 of the flange head 20. In the direction close to the sealing section 22, the cross-sectional area of the connecting section 21 gradually increases, so that the decomposed axial force of the clamping ring 30 applied to the tapered part of the connecting section 21 is directed towards the sealing section 22, and the decomposed axial compression force can compress the sealing section 22 of the flange head 20, preventing deformation and leakage of the flange head 20, and more conducive to the sealing of the flange head 20. The equal outer diameter of the sealing section 22 can ensure that the stress of the sealing section 22 is equal, and thus the strength of the sealing section 22 of the flange head 20 is ensured.

[0059] Specifically, the angle between the tapered outer circumferential surface 211 of the connecting section 21 and the vertical direction is 40° to 60°, for example, it can be 45°, 55° or 60°, and preferably 55°.

[0060] In some embodiments of the present application, as shown in Figure 6 The flange head 20 further comprises an extension section 23 arranged at the free end of the connecting section 21, the outer diameter of the extension section 23 is smaller than that of the connecting section 21, and the extension section 23 comprises a first section 231 and a second section 232, the first section 231 connects the connecting section 21 and the second section 232, the outer diameter of the first section 231 is equal everywhere and equal to the minimum outer diameter of the connecting section 21, and the outer circumferential surface of the second section 232 is tapered.

[0061] In the embodiments of the present application, the flange head 20 further comprises an extension section 23, the outer diameter of the first section 231 of the extension section 23 is equal everywhere, the outer circumferential surface of the second section 232 is tapered, and the upper surface of the first section 231 of the extension section 23 is arranged at a high-low gradient with the upper surface of the second section 232, so that the longitudinal cross section of the extension section 23 is a right trapezoid. The extension section 23 can increase the connection area of the flange head 20 and the composite pipe 10, increase the bonding strength of 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 of the flange head 20 and the composite pipe 10. The outer diameter of the first section 231 is equal everywhere and equal to the minimum outer diameter of the connecting section 21, so that the flatness of the connection between the first section 231 and the connecting section 21 is higher and the stress is more uniform.

[0062] In some embodiments of the present application, the outer side of each flange head 20 is provided with a clamping ring 30 and a hoop member 40, the clamping ring 30 is pressed on the outer side of the first section 231 and the connecting section 21, the outer side of the clamping ring 30 comprises a limiting step 31, the hoop member 40 is sleeved on the outer side of the clamping ring 30 and cooperates with the limiting step 31, and the hoop members 40 of the flange heads 20 of two adjacent composite pipes 10 are connected to lock the two connected flange heads 20.

[0063] In the embodiments of the present application, as shown in Figure 2 、 Figure 5 and Figure 6 To tightly connect two composite pipes 10, a clamping ring 30 and a hoop member 40 are further arranged on the composite pipe 10. The clamping ring 30 is adapted to the shape of the sealing section 22 and the connecting section 21, and respectively forms a first pressing surface 311 abutting against the horizontal section of the connecting section 21, a second pressing surface 312 abutting against the tapered section of the connecting section 21, and a third pressing surface 313 abutting against the extension section 23. The partial circumferential surface of the connecting section 21 is tapered, so that the force acting on the flange head 20 by the clamping ring 30 is decomposed into a radial tension and an axial compression force through angles. The axial compression force can press the sealing section 22 of the flange head 20, preventing the flange head 20 from deforming and leaking, and is more conducive to the sealing of the flange head 20. The radial tension can lock the adjacent two flange heads 20, so that the connection of the two composite pipes 10 is more stable.

[0064] In addition, the clamping ring 30 abuts against the flange head 20, so that the clamping ring 30 can enhance the flange head 20 in a cladding manner, overcoming the creep effect of the flange head 20 in the later stage.

[0065] The clamping ring 30 includes a limiting step 31, and the limiting step 31 can lock the adjacent two clamping rings 30 in cooperation with the hoop member 40.

[0066] The clamping ring 30 can be designed as a hollow structure, and under the action of the hoop member 40, the clamping ring 30 has a tendency to deform the center of the cross section of the composite pipe 10, further increasing the hoop outward pressure of the flange head 20, and offsetting the internal pressure borne by the flange head 20, completing the sealing function of the sealing section 22 of the flange head 20, so that the sealing pressure of the connection of the composite pipe 10 is higher, and the sealing performance is better.

[0067] Specifically, the clamping ring 30 can be composed of two semicircular hoop clamps and bolts connecting the two semicircular hoop clamps. More specifically, the semicircular hoop clamps can be steel skeleton hoop clamps, and the semicircular hoop clamps can be hollow structures, which are combined into a whole circle and abut against the outer surface of the flange head 20. The hoop member 40 can be composed of two semicircular steel flange pieces and bolts. The two steel flange pieces are connected by the bolts, and in actual application, the two flange pieces are clamped on one end of the composite pipe 10 and connected by the bolts. This arrangement can make the disassembly and installation of the two composite pipes 10 more convenient.

[0068] In some embodiments of the present application, the length of the flange head 20 along the axial direction of the composite pipe 10 is 10% to 20% of the outer diameter of the composite pipe 10, and the lengths of the sealing section 22, the connecting section 21 and the first section 231 are respectively 20% to 25%, 20% to 25% and 25% to 30% of the length of the flange head 20.

[0069] In the embodiments of the present application, the force generated by the combination of the flange head 20 and the composite pipe 10 must be greater than the tensile stress borne by the composite pipe 10, so that the flange head 20 is less likely to be separated from the composite pipe 10 during the process of connecting the flange head 20 to the composite pipe 10. The specific length of the flange head 20 is determined according to the pressure rating and the size of the composite pipe 10, and the tensile stress borne by the composite pipe 10 is calculated. 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.

[0070] In some embodiments of the present application, the end surface of the sealing section 22 is provided with at least one "V"-shaped water stop ring 220.

[0071] In the embodiments of the present application, the end surface of the sealing section 22 of the flange head 20 is provided with a water stop ring 220 for placing a sealing member, so as to eliminate the gap existing between the hard connection of the sealing sections 22, thereby making the sealing effect of the sealing section 22 better. Specifically, the number of "V"-shaped water stop rings 220 in the present embodiment can be three. The sealing member can be an annular sealing ring, which is clamped and connected by a group of adjacent flange heads 20 and forms a seal through the "V"-shaped water stop ring 220 on the end surface of the flange head 20.

[0072] In some embodiments of the present application, the end of the first plastic pipe layer 11 connected to the flange head 20 and away from the second plastic pipe layer 13 is provided with a chamfer 111.

[0073] In the embodiments of the present application, the flange head 20 is integrally formed with the composite pipe 10 after being injection molded on the composite pipe 10. Since only the end surface 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 during injection molding, thereby improving the connection strength between the flange head 20 and the first plastic pipe layer 11. In addition, the provision of the chamfer 111 can also avoid the internal stress of the first plastic pipe layer 11 due to the right-angle design, thereby preventing the fracture at the right-angle.

[0074] The embodiments of the second aspect of the present application provide a manufacturing method of a composite pipe, comprising:

[0075] S1: a first plastic pipe layer 11 and a second plastic pipe layer 13 are manufactured by injection molding.

[0076] S2: a plurality of reinforcing filaments 121 and a first adhesive liquid 122 are provided, the plurality of reinforcing filaments 121 are arranged in the same direction and are bonded together by being immersed in the first adhesive liquid 122 to form a strip 120, the outer surface of the strip 120 is covered with the first adhesive liquid 122, each strip 120 is spirally wound on the outer surface of the first plastic pipe layer 11 to form a reinforcing layer 12 of the composite pipe 10, and adjacent two strips 120 are crossed with each other.

[0077] S3: again covering the second plastic pipe layer 13 on the outer surface of the reinforcing layer 12, and the first plastic pipe layer 11 and the second plastic pipe layer 13 are adhered by the first adhesive 122 on the surface of the tape 120.

[0078] The composite pipe material prepared by the method provided in the embodiments of the present application can greatly improve the tensile and compression performance of the composite pipe 10 by setting the reinforcing layer 12. The stress of the entire reinforcing layer 12 is more uniform by the cross-winding between the adjacent tapes 120, which prevents the problem of reverse unwinding of the tape 120 when the first plastic pipe layer 11 is unidirectionally wound, so that the reinforcing layer 12 is stressed in only one direction, and the composite pipe 10 is compressed. Each tape 120 is composed of a plurality of reinforcing filaments 121 arranged in the same direction, and the reinforcing filaments 121 arranged in the same direction make the stress direction of the reinforcing filaments 121 the same and the stress more uniform. The plurality of reinforcing filaments 121 are soaked in the first adhesive 122 to form the tape 120, and the surface of the tape 120 formed by soaking is automatically attached with a layer of the first adhesive 122. When the tape 120 is wound on the first plastic pipe layer 11, and the second plastic pipe layer 13 is covered on the reinforcing layer 12 by the covering mold, the first adhesive 122 can play a role in adhering the first plastic pipe layer 11 and the second plastic pipe layer 13. Therefore, the reinforcing layer 12 is less likely to separate from the first plastic pipe layer 11 and the second plastic pipe layer 13 during the use of the composite pipe material, and the overall consistency of the composite pipe material is greatly improved under the premise of improving the tensile and compression performance of the composite pipe material, thereby prolonging the service life of the composite pipe material.

[0079] In the embodiments of the present application, the first layer of tapes 120 can be right-handedly wound on the first plastic pipe layer 11, and then the second layer of tapes 120 can be left-handedly wound on the same end of the first plastic pipe layer 11 to form the reinforcing layer 12.

[0080] In some embodiments of the present application, the reinforcing filaments 121 are twisted and then soaked in the first adhesive 122 to form the tape 120. In the embodiments of the present application, in order to further improve the tensile and compression performance of the composite pipe material, the plurality of reinforcing filaments 121 are twisted, and the twisted reinforcing filaments 121 form the tape 120 through the first adhesive 122.

[0081] It is to be noted that, as used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components, and the term "an element" can include comparable reference to a plurality of elements. Also, as used in this specification and the appended claims, the term "or" as used in the context of "A / B" or "A / B / C" means any of the possibilities; for example, the term "or" means "any of A, B, or C; or any of A, B, or C." Further, the term "comprising" as used in this specification and the appended claims, is inclusive or open and does not exclude additional, non-relevant elements or limit it to the specific elements

[0082] The preferred embodiments herein disclosed are not to be construed as limiting the scope of the invention. Any modification, equivalent replacement, improvement, and the like which do not depart from the spirit and principle of the invention are intended to be included in the scope of the invention.

Claims

1. A composite pipe, characterized by, The composite pipe (10) comprises: a first plastic pipe layer (11); a reinforcing layer (12) coated on the outer surface of the first plastic pipe layer (11), the reinforcing layer (12) comprising a plurality of tapes (120), each of the tapes (120) comprising a plurality of reinforcing filaments (121) arranged in the same direction, the plurality of reinforcing filaments (121) being impregnated with a first adhesive solution (122) to be bonded together, and the outer surface of the tape (120) being covered with the first adhesive solution (122), each of the tapes (120) being spirally wound on the outer surface of the first plastic pipe layer (11), and adjacent two of the tapes (120) being crossed with each other, the crossing angle (a) between adjacent two of the tapes (120) being 40° to 100°; a second plastic pipe layer (13) coated on the outer surface of the reinforcing layer (12), the first plastic pipe layer (11) and the second plastic pipe layer (13) being bonded by the first adhesive solution (122) on the surface of the tape (120); the material of the first adhesive solution (122) is PE glue; one end or both ends of each of the composite pipes (10) is provided with an injection molded flange (20), a plurality of the composite pipes (10) are connected by the flanges (20) to be connected to each other, the flange (20) comprising a connecting section (21) and a sealing section (22), the connecting section (21) being sleeved on the outer surface of the composite pipe (10), and the sealing section (22) extending along the axial direction of the composite pipe (10) beyond the composite pipe (10); the tape (120) is wound on the first plastic pipe layer (11), the second plastic pipe layer (13) is coated on the reinforcing layer (12) by a coating mold, and the first adhesive solution (122) bonds the first plastic pipe layer (11) and the second plastic pipe layer (13). The tape (120) is twisted from a plurality of reinforcing filaments (121) arranged in the same direction.

2. The composite pipe of claim 1, wherein The reinforcing filaments (121) are metal wires, and the diameter of the metal wires is less than or equal to 0.5 mm.

3. The composite pipe of claim 1, wherein The metal wires are steel wires.

4. The composite pipe of claim 3, wherein The first plastic pipe layer (11) and the second plastic pipe layer (13) are thermoplastic polyolefin materials.

5. The composite pipe of claim 1, wherein At least part of the outer circumferential surface of the connecting section (21) is tapered, and the cross-sectional area of the connecting section (21) gradually increases in the direction close to the sealing section (22), the outer diameter of the sealing section (22) is equal everywhere and equal to the maximum outer diameter of the connecting section (21).

6. The composite pipe of claim 1, wherein ​ 7. The composite pipe of claim 6, wherein The flange head (20) further comprises an extension section (23) arranged at the free end of the connecting section (21), the extension section (23) has an outer diameter smaller than that of the connecting section (21), and the extension section (23) comprises a first section (231) and a second section (232), the first section (231) connects the connecting section (21) and the second section (232), the outer diameter of the first section (231) is equal everywhere and is equal to the minimum outer diameter of the connecting section (21), and the outer peripheral surface of the second section (232) is arranged in a tapered manner.

8. The composite pipe of claim 7, wherein, The outer side of each flange head (20) is provided with a snap ring (30) and a hoop member (40), the snap ring (30) is pressed and fitted on the outer side of the first section (231) and the connecting section (21), the outer side of the snap ring (30) comprises a limiting step (31), the hoop member (40) is sleeved on the outer side of the snap ring (30) and cooperates with the limiting step (31), and the hoop members (40) of the flange heads (20) of two adjacent composite pipes (10) are connected to lock the two connected flange heads (20).

9. The composite pipe of claim 7, wherein In 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 connecting section (21) and the first section (231) are 20% to 25%, 20% to 25% and 25% to 30% of the length of the flange head (20) respectively.

10. The composite pipe of any one of claims 1-9, wherein, The end surface of the sealing section (22) is provided with at least one "V"-shaped water stop ring (220).

11. The composite pipe of any one of claims 1-9, wherein, The end of the first plastic pipe layer (11) connected to the flange head (20) and away from the second plastic pipe layer (13) is provided with a chamfer (111).

12. A method of manufacturing a composite pipe for manufacturing the composite pipe according to any one of claims 1 to 11, characterized by, Comprise: The first plastic pipe layer (11) and the second plastic pipe layer (13) are made by injection molding; A plurality of reinforcing filaments (121) and a first adhesive glue (122) are provided, the plurality of reinforcing filaments (121) are arranged in the same direction, are soaked and bonded together in the first adhesive glue (122) to form a strip (120), the outer surface of the strip (120) is covered with the first adhesive glue (122), each strip (120) is spirally wound on the outer surface of the first plastic pipe layer (11) to form a reinforcing layer (12) of the composite pipe (10), and adjacent two strips (120) cross each other; The second plastic pipe layer (13) is further wrapped on the outer surface of the reinforcing layer (12), and the first plastic pipe layer (11) and the second plastic pipe layer (13) are bonded by the first adhesive glue (122) on the surface of the strip (120).

13. The method of producing a composite pipe according to claim 12, wherein The reinforcing filaments (121) are twisted and then soaked and bonded in the first adhesive glue (122) to form the strip (120).

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