Composite pipeline

Abstract

The utility model relates to the field of material conveying pipelines, and discloses a composite pipeline which comprises a lining pipe. The connecting sleeve comprises a connecting sleeve body arranged at the end of the lining pipe in a sleeving mode and a plurality of protruding units arranged on the peripheral wall of the connecting sleeve body at intervals. The first fiber composite material layer is wound on the peripheral wall of the lining pipe; and the second fiber composite material layer is wound on the periphery of the first fiber composite material layer and wound on the peripheral wall of the connecting sleeve body by hooking and winding the multiple protruding units, and the fiber winding angle of the second fiber composite material layer is not larger than that of the first fiber composite material layer. The first fiber composite material layer can improve the radial loading capacity of the pipeline and reduce the bursting risk of the lining pipe, the second fiber composite material layer can improve the axial and torque loading capacity of the pipeline and can enhance the stability of the first fiber composite material layer, and therefore the overall mechanical property, stability and reliability of the pipeline can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material conveying pipeline, and particularly relates to a composite pipeline. BACKGROUND

[0002] Some existing material conveying pipelines, such as concrete conveying pipelines, have an increasingly great demand for lightweight, and fiber-reinforced resin-based composite materials (hereinafter referred to as "fiber composite materials") gradually become the mainstream direction of lightweight design and manufacturing of material conveying pipelines due to the advantages of high specific strength, high specific modulus, good fatigue resistance and strong designability.

[0003] However, the fiber composite material is limited by its own characteristics and cannot have the same diversity in connection methods as other materials such as metal materials, and therefore, in order to take into account the selection of connection methods, practicality and other factors, a composite pipeline manufactured by combining fiber composite materials with other materials is usually used.

[0004] However, the existing composite pipeline still has a large space for improvement in overall mechanical properties, stability and reliability, and therefore it is necessary to optimize the structure of the composite pipeline at the present stage. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a composite pipeline which can optimize the pipeline structure to improve the overall mechanical properties, stability and reliability.

[0006] In order to achieve the above-mentioned purpose, the present application provides a composite pipeline, which comprises:

[0007] an inner liner pipe;

[0008] a connecting sleeve comprising a connecting sleeve body sleeved on the end portion of the inner liner pipe and a plurality of protruding units arranged on the outer peripheral wall of the connecting sleeve body at intervals;

[0009] a first fiber composite material layer wound on the outer peripheral wall of the inner liner pipe; and

[0010] a second fiber composite material layer wound on the outer peripheral portion of the first fiber composite material layer and wound on the outer peripheral wall of the connecting sleeve body by hooking a plurality of the protruding units, the fiber winding angle of the second fiber composite material layer being not greater than the fiber winding angle of the first fiber composite material layer.

[0011] In some embodiments, two connecting sleeve bodies are respectively sleeved on the two end portions of the inner liner pipe, and two end portions of the second fiber composite material layer are respectively wound on the outer peripheral walls of the two connecting sleeve bodies by respectively hooking the protruding units on the two connecting sleeve bodies.

[0012] In some embodiments, the composite pipe further includes a third fiber composite layer, which is wound around the outer periphery of the second fiber composite layer, wherein the fiber winding angle of the second fiber composite layer is not greater than the fiber winding angle of the third fiber composite layer.

[0013] In some embodiments, the ends of the third fiber composite layer are hooked around a plurality of the protruding units.

[0014] In some embodiments, the composite pipe further includes a fourth fiber composite layer, which is wound around the third fiber composite layer on the outer peripheral region located at the connecting sleeve body, wherein the fiber winding angle of the second fiber composite layer is not greater than the fiber winding angle of the fourth fiber composite layer.

[0015] In some embodiments, the fourth fiber composite layer is wound around a plurality of the protruding units.

[0016] In some embodiments, the first fiber composite layer, the second fiber composite layer, the third fiber composite layer, and the fourth fiber composite layer are continuously and sequentially wound together.

[0017] In some embodiments, the radial thickness of the first fiber composite layer is not less than 1 mm;

[0018] And / or, the radial thickness of the second fiber composite layer is not less than 3 mm;

[0019] And / or, the radial thickness of the third fiber composite layer is not less than 1 mm;

[0020] And / or, the radial thickness of the fourth fiber composite layer is not less than 3 mm.

[0021] In some embodiments, the fiber winding angle of the first fiber composite layer is 45° to 90°;

[0022] And / or, the fiber winding angle of the second fiber composite layer is 0° to 45°;

[0023] And / or, the fiber winding angle of the third fiber composite layer is 45° to 90°;

[0024] And / or, the fiber winding angle of the fourth fiber composite layer is 45° to 90°.

[0025] In some embodiments, the spacing between any two adjacent protruding units is no greater than the width of the fiber yarn of the second fiber composite layer, so that the gap between any two adjacent protruding units is covered by the fiber yarn of the second fiber composite layer.

[0026] In some embodiments, the plurality of protruding units constitute a plurality of protruding structure groups, the plurality of protruding structure groups are arranged sequentially at intervals along the axial direction of the connecting sleeve body, and the plurality of protruding units in the same protruding structure group are arranged sequentially at intervals along the circumferential direction of the connecting sleeve body.

[0027] And / or, the protruding unit and the connecting sleeve body are formed as an integral structure.

[0028] In some embodiments, the number of protrusion units in a single protrusion structure group is 10 to 50;

[0029] And / or, the number of the protrusion structure groups in a single connecting sleeve is not less than 5.

[0030] In some embodiments, the shear strength of a single protrusion unit is not less than 1000 MPa.

[0031] In some embodiments, the composite pipe further includes a wear-resistant sleeve, which is fitted inside the connecting sleeve body and axially connected to the inner liner tube. The inner liner tube, the connecting sleeve body, and the wear-resistant sleeve are all fixed together by adhesive.

[0032] Through the above technical solution, when the composite pipeline of this application transports materials such as concrete, the materials flow in the inner lining pipe, thus impacting the peripheral wall of the inner lining pipe. The first fiber composite layer, wrapped around the outer peripheral wall of the inner lining pipe and having a relatively large fiber winding angle, can bear more radial loads and effectively reduce the risk of inner lining pipe bursting. In addition, the second fiber composite layer has a relatively small fiber winding angle. By hooking the second fiber composite layer around the multiple protruding units in the connecting sleeve to wrap around the outer peripheral wall of the connecting sleeve body, the second fiber composite layer can form a mechanical engagement with the connecting sleeve, allowing the second fiber composite layer to apply axial tensile force to the connecting sleeve body, greatly improving the connection stability between the connecting sleeve body and the inner lining pipe. Moreover, the torque borne by the connecting sleeve body can be transmitted to the second fiber composite layer through the multiple protruding units. Thus, the second fiber composite layer can bear the axial and torsional loads of the composite pipeline, improving the axial load capacity and torsional resistance of the composite pipeline. Furthermore, the second fiber composite layer, wrapped around the outer periphery of the first fiber composite layer, can enhance the stability of the first fiber composite layer. It is evident that this application can effectively improve the overall mechanical properties, stability, and reliability of composite pipes by optimizing their structure.

[0033] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0035] Figure 1 This is a partial cross-sectional view of a composite pipeline according to a specific embodiment of this application;

[0036] Figure 2 for Figure 1 A partial structural diagram of the composite pipeline in the diagram;

[0037] Figure 3 for Figure 2 Sectional view AA;

[0038] Figure 4 for Figure 1 A schematic diagram of the connecting sleeve in the middle;

[0039] Figure 5 for Figure 4 BB (sectional view);

[0040] Figure 6 for Figure 1 A schematic diagram of the wear-resistant sleeve in the middle.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Inner liner tube; 2. Fiber composite structure

[0043] 3 Connecting sleeve 4 Wear-resistant sleeve

[0044] 21 First fiber composite layer 22 Second fiber composite layer

[0045] 23 Third fiber composite layer 24 Fourth fiber composite layer

[0046] 31 Connecting sleeve body 32 Protruding unit Detailed Implementation

[0047] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0048] Reference Figures 1 to 6 This application provides a composite conduit, comprising:

[0049] Inner liner 1;

[0050] The connecting sleeve 3 includes a connecting sleeve body 31 that is sleeved on the end of the inner liner tube 1 and a plurality of protruding units 32 that are spaced apart from each other on the outer peripheral wall of the connecting sleeve body 31.

[0051] The first fiber composite layer 21 is wound around the outer peripheral wall of the inner liner tube 1; and

[0052] The second fiber composite layer 22 is wound around the outer periphery of the first fiber composite layer 21 and is wound around the outer periphery of the connecting sleeve body 31 by hooking around a plurality of protruding units 32, and the fiber winding angle of the second fiber composite layer 22 is not greater than the fiber winding angle of the first fiber composite layer 21.

[0053] It should be noted that, in this paper, the fiber winding angle of the fiber composite layer refers to the angle between the fiber yarn of the fiber composite layer and the axial direction of the inner liner tube 1. When the fiber winding angle of the fiber composite layer is smaller, the fiber composite layer bears more axial load and less radial load; when the fiber winding angle of the fiber composite layer is larger, the fiber composite layer bears less axial load and more radial load.

[0054] With the above configuration, when the composite pipeline of this application transports materials such as concrete, the materials flow in the inner liner 1, which will impact the peripheral wall of the inner liner 1. The first fiber composite layer 21 is wrapped around the outer peripheral wall of the inner liner 1 and has a relatively large fiber winding angle, which can bear more radial load and effectively reduce the risk of the inner liner bursting.

[0055] Furthermore, the fiber winding angle of the second fiber composite layer 22 is relatively small. By hooking the second fiber composite layer 22 around the multiple protruding units 32 in the connecting sleeve 3 to wrap around the outer peripheral wall of the connecting sleeve body 31, the second fiber composite layer 22 can form a mechanical engagement with the connecting sleeve 3, so that the second fiber composite layer 22 can apply axial tension to the connecting sleeve body 31, which greatly improves the connection stability between the connecting sleeve body 31 and the inner liner 1. Moreover, the torque borne by the connecting sleeve body 31 can be transmitted to the second fiber composite layer 22 through the multiple protruding units 32. Thus, the second fiber composite layer 22 can bear the axial and torque loads of the composite pipe, improving the axial load capacity and torsional resistance of the composite pipe. In addition, the second fiber composite layer 22 wraps around the outer periphery of the first fiber composite layer 21, which can enhance the stability of the first fiber composite layer 21.

[0056] When multiple composite pipes are connected to form a pipe assembly, adjacent composite pipes are connected by their respective connecting sleeve bodies 31. In order to ensure the stability of the connection, the connecting sleeve bodies 31 are usually made of high-strength materials (such as metal materials). Therefore, for composite pipes, the connecting sleeve bodies 31 can provide strong radial load capacity at the position where they are connected to the inner liner 1. Thus, the first fiber composite layer 21 of this application only needs to be wrapped around the outer peripheral wall of the inner liner 1, and does not need to be wrapped around the outer peripheral wall of the connecting sleeve body 31. This reduces the wrapping area of ​​the first fiber composite layer 21 and saves its material and cost.

[0057] In summary, by optimizing the structure of the composite pipe, this application can effectively improve its overall mechanical properties, stability and reliability, while saving the material and cost of the first fiber composite layer 21.

[0058] In some embodiments, considering that the inner liner 1 will gradually wear down and thin during use, and may even wear through, and will hardly bear radial load in the later stages of use, in order to ensure the load-bearing performance of the composite pipe, this embodiment is specifically designed so that the radial load of the composite pipe is basically borne by the first fiber composite layer 21. The radial thickness t of the first fiber composite layer 21 can be determined according to the material mechanics formula for thick-walled cylinders. f1 .

[0059] Specifically, it satisfies: Where d1 is the outer diameter of the inner liner tube 1, [σ] is the preset maximum circumferential stress allowed by the first fiber composite layer 21, and P C This is the preset working internal pressure of the composite pipeline.

[0060] In contrast, existing composite pipe technologies only qualitatively indicate that the fiber composite layer can improve the load-bearing and explosion-proof performance of the pipe, but do not provide clear and standardized design methods. Empirical design can easily lead to the fiber composite layer being too thick or too thin, resulting in the composite pipe's lightweight effect being insignificant or failing to meet the required load-bearing and explosion-proof performance.

[0061] In this embodiment, the radial thickness t of the first fiber composite layer 21 is provided. f1 The calculation method is more standardized and precise, which can more significantly improve the radial load capacity and lightweight effect of composite pipes.

[0062] In some embodiments, the protruding unit 32 and the connecting sleeve body 31 are formed as an integral structure. For example, the protruding unit 32 can be welded onto the outer peripheral wall of the connecting sleeve body 31, or it can be integrally formed with the connecting sleeve body 31.

[0063] By adopting a structure in which the protruding unit 32 is integrally connected with the connecting sleeve body 31, no holes are needed on the connecting sleeve body 31, which will not affect the strength of the connecting sleeve body 31. Moreover, the connection stability between the protruding unit 32 and the connecting sleeve body 31 is strong, which can make the protruding unit 32 have a stronger load-bearing capacity.

[0064] In some embodiments, refer to Figure 2 and Figure 3 Multiple protruding units 32 can form multiple protruding structure groups. Among them, multiple protruding structure groups are arranged sequentially at intervals along the axial direction of the connecting sleeve body 31 (for example, arranged sequentially at equal intervals), and multiple protruding units 32 in the same protruding structure group are arranged sequentially at intervals along the circumferential direction of the connecting sleeve body 31 (for example, arranged sequentially at equal intervals).

[0065] With the configuration of this embodiment, the arrangement area of ​​the multiple protruding units 32 on the outer peripheral wall of the connecting sleeve body 31 is large and regularly arranged, which makes it easier for the fiber yarn to wind. Furthermore, the second fiber composite layer 22 forms a mechanical engagement with more protruding units 32, and the area wound on the outer peripheral wall of the connecting sleeve body 31 is even larger, thereby further improving the axial load and torsional resistance.

[0066] It should be noted that when the composite pipeline of this application transports materials such as concrete, the axial force generated at both ends of the inner lining pipe 1 by the internal pressure is transmitted to the second fiber composite layer 22 through the protruding unit 32 in the connecting sleeve 3, and the shear force on the connecting sleeve 3 is also borne by the second fiber composite layer 22. Therefore, based on the force analysis, the following two sets of relationships can be obtained:

[0067] F 纤 +F 剪 ≥F 承 ;F 凸 ≥F 纤 ;—①

[0068] F 凸 +F 剪 ≥F 承 ;F 纤 ≥F 凸 ;—②

[0069] In relations ① and ②, F 纤 F represents the axial tensile force that the second fiber composite layer 22 can withstand. 剪 F represents the interfacial shear force between the fiber yarn of the second fiber composite layer 22 and the connecting sleeve body 31. 承 F represents the vector sum of the axial and torsional loads acting on the composite pipe. 凸 This indicates the axial tensile force that the raised unit 32 can withstand.

[0070] For relation ①, when F 纤 +F剪 ≥F 承 When F is greater than or equal to the vector sum of the axial tensile force that the second fiber composite layer 22 can withstand and the interfacial shear force between the fiber yarn of the second fiber composite layer 22 and the connecting sleeve body 31, the second fiber composite layer 22 will not be damaged. Therefore, the second fiber composite layer 22 and the protruding unit 32 will not be damaged at this time. 纤 +F 剪 <F 承 When the vector sum of the axial and torsional loads on the composite pipeline exceeds the limit, it indicates that, due to F 凸 ≥F 纤 Therefore, the second fiber composite layer 22 will be damaged.

[0071] For relation ②, when F 凸 +F 剪 ≥F 承 When F 凸 +F 剪 <F 承 When the vector sum of the axial and torsional loads on the composite pipeline exceeds the limit, it indicates that, due to F 纤 ≥F 凸 Therefore, the protruding unit 32 will be damaged.

[0072] Because the load-bearing capacity of the protruding unit 32 is limited by materials and arrangement space, it is more difficult to improve than the second fiber composite layer 22 (the load-bearing capacity of the fiber composite layer can be improved by increasing its radial thickness). Therefore, if we take F in equation ① as an example... 纤 +F 剪 ≥F 承 The radial thickness of the second fiber composite layer 22 is designed based on the baseline, and further assurance of F is required. 凸 ≥F 纤 It will be difficult to guarantee that the load-bearing capacity of the raised unit 32 can be made greater than or equal to the load-bearing capacity of the second fiber composite layer 22 by adjusting the materials and the arrangement of space.

[0073] However, if we take F in relation ② 纤 ≥F 凸 The radial thickness of the second fiber composite layer 22 is designed based on the reference. The radial thickness of the second fiber composite layer 22 can be calculated while ensuring that the load-bearing capacity of the protruding unit 32 is sufficient. The load-bearing capacity of the second fiber composite layer 22 can be simply achieved by increasing its radial thickness.

[0074] Therefore, F in relation ② 纤 ≥F 凸 The radial thickness of the second fiber composite layer 22 and the number of protruding units 32 are designed based on the reference, which is the preferred approach adopted in this application.

[0075] In some embodiments, based on the foregoing analysis, through F in relation ② 纤 ≥F 凸 The radial thickness t of the second fiber composite layer 22 can be derived. f2 ,satisfy: Wherein, d2 is the outer diameter of the connecting sleeve body 31, d3 is the outer diameter of the protrusion unit 32, n1 is the number of protrusion structure groups in a single connecting sleeve 3 (which can be preset or calculated according to the embodiments provided later), P T η is the preset shear strength of a single protruding unit 32, η is the preset loss coefficient, B is the preset fiber yarn width of the second fiber composite layer 22, and P is the preset shear strength of a single protruding unit 32. L α is the preset tensile strength of the fiber yarn of the second fiber composite layer 22, and α is the preset fiber winding angle of the second fiber composite layer 22.

[0076] In practical applications, for example, the number n1 of protrusion structure groups in a single connecting sleeve 3 can be set to be no less than 5 (preferably 11), and the shear strength P of a single protrusion unit 32 can be set. T Not less than 1000 MPa, etc.

[0077] In contrast, existing composite pipe technologies only qualitatively point out that the fiber composite layer can improve the load-bearing capacity of the pipe, but do not provide clear and standardized design methods. Empirical design can easily lead to the fiber composite layer being too thick or too thin, resulting in the composite pipe's lightweight effect being insignificant or failing to meet the required load-bearing capacity.

[0078] In this embodiment, the radial thickness t of the second fiber composite layer 22 is provided. f2 The calculation method is more standardized and precise, which can more significantly improve the axial and torsional load capacity and lightweight effect of composite pipes.

[0079] In some embodiments, F in relation ② can also be used. 凸 +F 剪 ≥F 承 The number n1 of protrusion structure groups in a single connecting sleeve 3 is derived, satisfying: Wherein, d1 is the outer diameter of the inner liner tube 1, d2 is the outer diameter of the connecting sleeve body 31, d3 is the outer diameter of the protruding unit 32, and P C P is the preset working internal pressure of the composite pipeline. T P is the preset shear strength of a single protrusion unit 32. Jα is the interfacial shear strength between the fiber yarn of the second fiber composite layer 22 and the connecting sleeve body 31, B is the preset fiber yarn width of the second fiber composite layer 22, and α is the preset fiber winding angle of the second fiber composite layer 22.

[0080] In practical applications, for example, the number n1 of protrusion structure groups in a single connecting sleeve 3 can be set to be no less than 5 (preferably 11), and the shear strength P of a single protrusion unit 32 can be set. T Not less than 1000 MPa, etc.

[0081] As can be seen, this embodiment provides a method for calculating the number n1 of the protruding structure groups in a single connecting sleeve 3. The design is more standardized and accurate, which can significantly improve the load-bearing capacity of the connecting sleeve 3, avoid excessive material usage due to an excessive number of protruding structure groups, and avoid insufficient load-bearing capacity due to an insufficient number of protruding structure groups.

[0082] In some embodiments, the spacing between any two adjacent protrusion units 32 may be set to be no greater than the width of the fiber yarn of the second fiber composite layer 22, so that the interval area between any two adjacent protrusion units 32 is covered by the fiber yarn of the second fiber composite layer 22.

[0083] As can be seen, this embodiment provides a solution that can quantify the relationship between the spacing of any two adjacent protruding units 32 and the fiber yarn width of the second fiber composite layer 22. Through the limitation of this embodiment, it can be ensured that the interval area between any two adjacent protruding units 32 is covered by the fiber yarn of the second fiber composite layer 22, that is, to avoid dead angles of fiber yarn entanglement between two adjacent protruding units 32, so that the shear force borne by the connecting sleeve body 31 can be basically transmitted to the second fiber composite layer 22, thereby greatly improving the torsional resistance of the connecting sleeve body 31.

[0084] In some embodiments, the number of protrusion units 32 in a single protrusion structure group is n2, and satisfies: n2 = πd2 / B. Wherein, d2 is the outer diameter of the connecting sleeve body 31, and B is the preset fiber yarn width of the second fiber composite layer 22.

[0085] In practical applications, for example, the number n2 of protrusion units 32 in a single protrusion structure group can be set to 10 to 50, and preferably 36.

[0086] In this embodiment, the number n2 of protruding units 32 in a single protruding structure group is limited by the preset fiber yarn width B of the second fiber composite layer 22. Therefore, the interval area between two adjacent protruding units 32 in the protruding structure group is covered by the fiber yarn of the second fiber composite layer 22, avoiding dead angles of fiber yarn entanglement between two adjacent protruding units 32, which is beneficial to improving the torsional resistance of the connecting sleeve body 31.

[0087] In some embodiments, the two ends of the inner liner tube 1 can be respectively fitted with two connecting sleeve bodies 31. In this case, the two ends of the second fiber composite layer 22 can respectively hook around the protruding units 32 on the two connecting sleeve bodies 31 to wrap around the outer peripheral walls of the two connecting sleeve bodies 31. With this configuration, the two ends of the second fiber composite layer 22 can respectively hold the two connecting sleeves 3, thereby also axially limiting the inner liner tube 1, which can effectively prevent the first fiber composite layer 21 from peeling off from the inner liner tube 1 as a whole, thus preventing the inner liner tube 1 from being pulled off and failing.

[0088] In some embodiments, the composite pipe may further include a third fiber composite layer 23, which is wound around the outer periphery of the second fiber composite layer 22. The third fiber composite layer 23 mainly serves to fasten and protect the second fiber composite layer 22. The fiber winding angle of the second fiber composite layer 22 is not greater than the fiber winding angle of the third fiber composite layer 23, that is, the fiber winding angle of the third fiber composite layer 23 is relatively large, which can further enhance the radial load capacity of the composite pipe.

[0089] Furthermore, the ends of the third fiber composite layer 23 can be hooked around multiple protruding units 32, thereby enhancing the connection stability of the third fiber composite layer 23.

[0090] In some embodiments, the composite pipe may further include a fourth fiber composite layer 24, which is wound around the third fiber composite layer 23 on the outer peripheral region located at the connecting sleeve body 31, so as to cover, fasten and protect it. The fiber winding angle of the second fiber composite layer 22 is not greater than the fiber winding angle of the fourth fiber composite layer 24, that is, the fiber winding angle of the fourth fiber composite layer 24 is relatively large, which can further enhance the radial load capacity of the composite pipe.

[0091] Furthermore, when the thickness of the third fiber composite layer 23 is uneven, since the fourth fiber composite layer 24 is formed by winding, the setting of the fourth fiber composite layer 24 is not difficult, and it will not result in insufficient coverage of the third fiber composite layer 23 by the fourth fiber composite layer 24. In other words, by setting the fourth fiber composite layer 24, not only is it easier to process and manufacture the composite pipe and ensure the protection of the third fiber composite layer 23, but it can also improve the production and processing efficiency.

[0092] In some embodiments, the fourth fiber composite layer 24 may be hooked around a plurality of protrusion units 32, thereby enhancing the connection stability of the fourth fiber composite layer 24.

[0093] In some embodiments, the first fiber composite layer 21, the second fiber composite layer 22, the third fiber composite layer 23, and the fourth fiber composite layer 24 can be wound continuously and sequentially, which can greatly improve the processing efficiency of the fiber composite structure 2 composed of the first fiber composite layer 21, the second fiber composite layer 22, the third fiber composite layer 23, and the fourth fiber composite layer 24.

[0094] In some embodiments, the radial thickness of the first fiber composite layer 21 is not less than 1 mm, preferably 1.5 mm; and / or, the radial thickness of the second fiber composite layer 22 is not less than 3 mm, preferably 3.5 mm; and / or, the radial thickness of the third fiber composite layer 23 is not less than 1 mm, preferably 1.5 mm; and / or, the radial thickness of the fourth fiber composite layer 24 is not less than 3 mm, preferably 4.5 mm.

[0095] In some embodiments, the fiber winding angle of the first fiber composite layer 21 is 45° to 90°, preferably 90°; and / or, the fiber winding angle of the second fiber composite layer 22 is 0° to 45°, preferably 45°; and / or, the fiber winding angle of the third fiber composite layer 23 is 45° to 90°, preferably 90°; and / or, the fiber winding angle of the fourth fiber composite layer 24 is 45° to 90°, preferably 90°.

[0096] In some embodiments, the composite pipe may further include a wear-resistant sleeve 4, which is axially connected to the inner liner 1. In this case, the connecting sleeve body 31 is sleeved on the end of the inner liner 1 and also sleeved on the wear-resistant sleeve 4, that is, the connecting sleeve body 31 can strengthen the fixation of the inner liner 1 and the wear-resistant sleeve 4. For example, the connecting sleeve body 31 and the wear-resistant sleeve 4 can be connected by an interference fit, and the material of the wear-resistant sleeve 4 can be selected from high-chromium cast iron, alloy steel, or hard alloy, etc.

[0097] In addition, the inner liner 1, the connecting sleeve body 31 and the wear-resistant sleeve 4 can all be fixed together by adhesive. In this way, the entire preparation process of the composite pipe can be completed without welding, thereby avoiding the problem of material performance degradation caused by welding heat input. Moreover, since there is no welding process, the materials of the components in the composite pipe are more widely selected and can be freely combined according to working conditions or technical requirements.

[0098] In some embodiments, the inner liner 1 itself may also be made of wear-resistant material, such as high manganese steel, chromium cast iron, alloy steel, etc. Furthermore, the thickness, hardness, and other parameters of the inner liner 1 can be determined according to the specific design. Generally, to ensure sufficient wear resistance and usage volume, the thickness of the inner liner 1 can be set to not less than 2.5 mm, preferably 3 mm, and the hardness of the inner liner 1 can be set to not less than 60 HRC, preferably 62 HRC.

[0099] In some embodiments, the fiber types that can be selected for the first fiber composite layer 21, the second fiber composite layer 22, the third fiber composite layer 23 and the fourth fiber composite layer 24 include, but are not limited to, carbon fiber, glass fiber, basalt fiber and aramid fiber, and the matrix resins that can be selected include, but are not limited to, epoxy resin, unsaturated resin and phenolic resin.

[0100] In some embodiments, the material of the connecting sleeve 3 may be selected from steel such as 20 steel or 45 steel, and 45 steel is preferred.

[0101] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0102] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0104] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A composite pipe, characterized in that, include: Inner liner (1); The connecting sleeve (3) includes a connecting sleeve body (31) that is sleeved on the end of the inner liner tube (1) and a plurality of protruding units (32) that are spaced apart from each other on the outer peripheral wall of the connecting sleeve body (31); The first fiber composite layer (21) is wrapped around the outer peripheral wall of the inner liner tube (1); and The second fiber composite layer (22) is wound around the outer periphery of the first fiber composite layer (21) and is wound around the outer periphery of the connecting sleeve body (31) by hooking around a plurality of the protruding units (32). The fiber winding angle of the second fiber composite layer (22) is not greater than the fiber winding angle of the first fiber composite layer (21).

2. The composite pipe according to claim 1, characterized in that, The two ends of the inner liner tube (1) are respectively fitted with two connecting sleeve bodies (31), and the two ends of the second fiber composite layer (22) are respectively wrapped around the outer peripheral wall of the two connecting sleeve bodies (31) by hooking around the protruding unit (32) on the two connecting sleeve bodies (31).

3. The composite pipe according to claim 1, characterized in that, The composite pipe further includes a third fiber composite layer (23), which is wound around the outer periphery of the second fiber composite layer (22), and the fiber winding angle of the second fiber composite layer (22) is not greater than the fiber winding angle of the third fiber composite layer (23).

4. The composite pipe according to claim 3, characterized in that, The third fiber composite layer (23) has multiple protruding units (32) hooked around its ends.

5. The composite pipe according to claim 3, characterized in that, The composite pipe further includes a fourth fiber composite layer (24), which is wound around the third fiber composite layer (23) on the outer peripheral region located at the connecting sleeve body (31), and the fiber winding angle of the second fiber composite layer (22) is not greater than the fiber winding angle of the fourth fiber composite layer (24).

6. The composite pipe according to claim 5, characterized in that, The fourth fiber composite layer (24) is wrapped around the plurality of the protruding units (32).

7. The composite pipe according to claim 5, characterized in that, The first fiber composite layer (21), the second fiber composite layer (22), the third fiber composite layer (23) and the fourth fiber composite layer (24) are continuously and sequentially wound together.

8. The composite pipe according to claim 5, characterized in that, The radial thickness of the first fiber composite layer (21) is not less than 1 mm; And / or, the radial thickness of the second fiber composite layer (22) is not less than 3 mm; And / or, the radial thickness of the third fiber composite layer (23) is not less than 1 mm; And / or, the radial thickness of the fourth fiber composite layer (24) is not less than 3 mm.

9. The composite pipe according to claim 5, characterized in that, The fiber winding angle of the first fiber composite layer (21) is 45° to 90°; And / or, the fiber winding angle of the second fiber composite layer (22) is 0° to 45°; And / or, the fiber winding angle of the third fiber composite layer (23) is 45° to 90°; And / or, the fiber winding angle of the fourth fiber composite layer (24) is 45° to 90°.

10. The composite pipe according to claim 1, characterized in that, The spacing between any two adjacent protruding units (32) is no greater than the width of the fiber yarn of the second fiber composite layer (22), so that the interval between any two adjacent protruding units (32) is covered by the fiber yarn of the second fiber composite layer (22).

11. The composite pipe according to claim 1, characterized in that, Multiple protruding units (32) constitute multiple protruding structure groups, and the multiple protruding structure groups are arranged sequentially at intervals along the axial direction of the connecting sleeve body (31). Multiple protruding units (32) in the same protruding structure group are arranged sequentially at intervals along the circumferential direction of the connecting sleeve body (31). And / or, the protruding unit (32) and the connecting sleeve body (31) are formed as an integral structure.

12. The composite pipe according to claim 11, characterized in that, The number of protrusion units (32) in a single protrusion structure group is 10 to 50; And / or, the number of the protrusion structure groups in a single connecting sleeve is not less than 5.

13. The composite pipe according to claim 1, characterized in that, The shear strength of a single protrusion unit (32) is not less than 1000 MPa.

14. The composite pipe according to any one of claims 1 to 13, characterized in that, The composite pipe also includes a wear-resistant sleeve (4), which is fitted inside the connecting sleeve body (31) and axially connected to the inner liner (1). The inner liner (1), the connecting sleeve body (31) and the wear-resistant sleeve (4) are all fixed together by adhesive.

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