Lightweight pipeline and pipeline forming method

Abstract

The invention provides a lightweight pipeline and a pipeline forming method, relates to the field of aircraft environmental control system pipelines, and solves the problems of tedious forming procedures, long production cycle and high production cost caused by an extra pipeline coating structure. The lightweight pipeline comprises a hard connecting pipe and a lightweight pipeline main body, the lightweight pipeline main body is formed by mutually splicing and fixing at least two half pipe bodies, and a groove is formed in the connecting end of the lightweight pipeline main body; one part of the hard connecting pipe is fixed in the groove of one light pipeline main body, and the other part of the hard connecting pipe is fixed in the groove of the other light pipeline main body, so that the two light pipeline main bodies are connected and fixed. The semi-pipe bodies are spliced into the light pipeline bodies, the hard connecting pipe is arranged at the connecting position of the two light pipeline bodies, the structural strength is improved, stress concentration is reduced, light-weight manufacturing and efficient connection of the pipeline are achieved, it can be guaranteed that the structural strength of the pipeline is high, the manufacturing process is simplified, and the production period is shortened.

Description

Technical Field

[0001] This invention relates to the field of aircraft environmental control system piping technology, and in particular to a lightweight piping and piping forming method. Background Technology

[0002] Modern aircraft piping systems must simultaneously meet the requirements of strength, environmental resistance, and lightweight design. The current mainstream solution is a combined structure of "basic piping + additional sheathing," mainly including two types: Traditional composite piping with coating: This method uses carbon fiber / glass fiber reinforced resin-based composite materials as the base piping, covered with a high-temperature resistant coating layer (such as polyimide foam). Its drawbacks include: complex processes requiring large-area, multi-layer prepreg installation and high-temperature curing; separate processing of the base piping and coating layer, leading to cumbersome procedures; high composite density resulting in greater overall weight after the coating layer is added; high raw material and equipment costs; and production cycles lasting several days.

[0003] PEEK filament wound hose + overlay: A hose is made by winding silicone-coated fiberglass cloth with impregnated PEEK filaments for reinforcement, and then covering it with an outer layer. Its drawbacks are: the PEEK filament winding requires precise control of tension and spacing, making the process complex; delamination is prone to occur when the fiberglass cloth, PEEK filaments, and overlay are combined; the overall structural density is high, limiting the lightweight effect; the multi-component assembly leads to a long production cycle, and the high price of PEEK filaments results in high overall costs.

[0004] The applicant has discovered that the prior art has at least the following technical problems: In order to meet the requirements of aircraft system strength, environmental resistance and lightweight, the prior art of aircraft environmental control system piping adopts a combination of pipe base material and coating. The additional coating structure leads to complicated molding process, long production cycle and high production cost. Summary of the Invention

[0005] The purpose of this invention is to provide a lightweight pipeline and a pipeline forming method to solve the technical problems of cumbersome forming processes, long production cycles, and high production costs caused by the additional covering structure of pipelines in the prior art. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The lightweight pipeline provided by this invention includes a rigid connecting pipe and a lightweight pipeline body, wherein: The lightweight pipeline body is composed of at least two half-pipes spliced ​​and fixed together, and the connection end of the lightweight pipeline body is provided with a groove; A portion of the rigid connecting tube is fixed in the groove of one of the lightweight pipe bodies, and the remaining portion of the rigid connecting tube is fixed in the groove of the other lightweight pipe body, thereby connecting and fixing the two lightweight pipe bodies.

[0007] Preferably, the groove is an annular groove, and the annular groove is coaxially arranged with the lightweight pipeline body; The inner diameter of the groove is larger than the inner diameter of the lightweight pipeline body, and a stepped structure is formed at the connection between the two.

[0008] Preferably, the end of the rigid connecting pipe abuts against the stepped surface of the stepped structure, and the inner wall of the rigid connecting pipe is coplanar with the inner wall of the lightweight pipeline body.

[0009] Preferably, the rigid connecting pipe is an annular pipe, and the rigid connecting pipe is coaxially arranged with the lightweight pipeline body.

[0010] Preferably, the joint side of two adjacent half-tubes is coated with a first adhesive portion for bonding the two half-tubes; A second adhesive portion is coated on the splicing side between two adjacent lightweight pipe bodies for bonding the two lightweight pipe bodies; The inner wall of the groove is coated with a third adhesive portion for fixing the lightweight pipeline body and the rigid connecting pipe.

[0011] Preferably, the outer periphery of the joint between adjacent half-tubes is coated with a first prepreg portion for fixing the two half-tubes after curing; A second prepreg is applied to the outer periphery of the joint between two adjacent lightweight pipe bodies to fix the two lightweight pipe bodies after curing.

[0012] Preferably, the radial cross-section of the semi-tube is semi-circular or semi-elliptical.

[0013] Preferably, the semi-tube is made of PVDF material.

[0014] Preferably, the wall thickness of the lightweight pipeline body is 5.0-20.0 mm, and the width of the first prepreg section and the second prepreg section is 25.4-50.8 mm.

[0015] The present invention also provides a pipe forming method for manufacturing the lightweight pipes described above, the method comprising: The PVDF sheet is pressed into a semi-tube forming mold, heated for a target time, and then cooled and shaped into the semi-tube body. A portion of the rigid connecting pipe is fixed in the groove of one of the lightweight pipe bodies, and the remaining portion of the rigid connecting pipe is fixed in the groove of the other lightweight pipe body. The two lightweight pipe bodies are then connected and fixed. A first prepreg is applied to the outer periphery of the joint between adjacent semi-pipe bodies, and a second prepreg is applied to the outer periphery of the joint between two adjacent lightweight pipe bodies, which are then heated and cured.

[0016] The lightweight pipeline and pipeline forming method provided by this invention have the following advantages compared with the prior art: By using half-pipes spliced ​​together to form the main body of the lightweight pipeline, and setting a rigid connecting pipe at the connection position of the two lightweight pipeline main bodies, the structural strength is improved and the stress concentration problem is reduced. Compared with the method of adding a coating layer to the pipeline substrate in the prior art, no complicated process is required, realizing lightweight manufacturing and efficient connection of the pipeline, and ensuring high structural strength of the pipeline; high-cost raw materials such as PEEK wire are not required, simplifying the manufacturing process, shortening the production cycle, reducing the overall weight, and reducing manufacturing costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the lightweight pipeline of the present invention; Figure 2 This is a cross-sectional structural diagram of the lightweight pipeline of the present invention; Figure 3 This is a structural diagram of the connection end of the semi-tube; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a structural schematic diagram of the main body of the lightweight pipeline; Figure 6 This is a schematic diagram of the connection structure between a rigid connecting pipe and a lightweight pipe body; Figure 7 This is a partial cross-sectional structural diagram of the rigid connecting pipe and the two lightweight pipes. Figure 8 yes Figure 7 A magnified view of a section at point B in the middle; Figure 9 This is a schematic diagram of the three-point bending of the main body of the lightweight pipeline; Figure 10 This is a compression diagram of the main body of a lightweight pipeline; Figure 11 This is a schematic diagram of the three-point bending of the lightweight pipeline as a whole; Figure 12 This is a simplified diagram of the lightweight piping system.

[0019] In the figure: 1. Half-pipe; 2. Rigid connecting pipe; 3. Lightweight pipeline body; 4. Groove; 41. Stepped surface; 5. First prepreg section; 6. Second prepreg section. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] This invention provides a lightweight pipeline and pipeline forming method, which simplifies the manufacturing process, shortens the production cycle, reduces the overall weight, and reduces manufacturing costs.

[0023] The following is combined Figures 1-12 The technical solution provided by this invention will be described in more detail below.

[0024] Example 1: See Figures 1-8 As shown, the lightweight pipeline provided by the present invention includes a rigid connecting pipe 2 and a lightweight pipeline body 3, wherein: the lightweight pipeline body 3 is formed by at least two half-pipes 1 spliced ​​and fixed together, and a groove 4 is provided in the connecting end of the lightweight pipeline body 3; a part of the rigid connecting pipe 2 is fixed in the groove 4 of one of the lightweight pipeline bodies 3, and the remaining part of the rigid connecting pipe 2 is fixed in the groove 4 of the other lightweight pipeline body 3, thereby connecting and fixing the two lightweight pipeline bodies 3.

[0025] The groove 4 can be formed by machining, laser cutting, or chemical etching. For example, in machining, the groove 4 can be machined in the connecting end of the lightweight pipe body 3 by milling or turning; in laser cutting, the groove 4 can be formed by locally removing material using high-precision laser equipment; in chemical etching, the groove 4 can be generated by selectively corroding the material surface with specific chemical reagents. It can also be manufactured by forming with a corresponding mold.

[0026] Among them, the rigid connecting pipe 2 is relatively hard, and the lightweight pipeline body 3 made of the semi-pipe 1 is relatively light. The rigid connecting pipe 2 can be a high-strength composite material pipe body.

[0027] As an optional implementation, the semi-tube 1 is made of PVDF material.

[0028] The density of PVDF foam material is only 40 kg / m³ 3 Compared to "composite pipe + wrapping", it reduces weight by 30%-40% and compared to "PEEK wire-wound silicone cloth hose + wrapping" by 20%-30%; moreover, the lightweight pipe in this embodiment does not require the additional weight of the wrapping layer, further improving the weight reduction effect.

[0029] In terms of raw materials, the cost of PVDF foam material is only 1 / 4 to 1 / 6 of that of prepreg and only 1 / 3 to 1 / 5 of that of PEEK filament. In terms of process, the process is simple, the labor cost is reduced by more than 50%, and the overall comprehensive cost is reduced by 55% to 65% compared with "composite pipe + wrapping" and by 45% to 55% compared with "PEEK filament wound silicone cloth hose + wrapping".

[0030] Therefore, in this embodiment, PVDF foam material is used as the manufacturing material of the lightweight pipeline body 3, which can ensure the advantage of lightweight design. In addition, the rigid connecting pipe 2 is fixed in the groove 4 of two adjacent lightweight pipeline bodies 3, which can improve the structural strength at the connection position of the lightweight pipeline body 3 (the position where stress is easily concentrated), thus ensuring that the overall pipeline has high structural strength.

[0031] In this embodiment, the additional covering structure of traditional aircraft piping systems is eliminated. By using the segmented splicing of the lightweight pipe body 3 and the embedded connection of the rigid connecting pipe 2, the manufacturing process is effectively simplified and the production cost is reduced. Specifically, the lightweight pipe body 3 avoids the complex process of large-area, multi-layer prepreg laying and high-temperature curing required by traditional composite pipes, significantly shortening the molding time; the groove 4 provides a reliable embedding space for the rigid connecting pipe 2, eliminating the step-by-step processing steps of the external covering layer; the cross-connection of the rigid connecting pipe 2 directly achieves seamless docking of the two pipe bodies, avoiding the risk of delamination and the use of additional connectors that are easily caused by splicing multiple components, thereby greatly reducing production steps and improving assembly efficiency.

[0032] As an alternative implementation, see [link to implementation details]. Figures 3-6 As shown, the groove 4 is an annular groove, which is coaxial with the lightweight pipe body 3; the inner diameter of the groove 4 is larger than the inner diameter of the lightweight pipe body 3, and a stepped structure is formed at the connection between the two.

[0033] See Figure 3 and Figure 4 As shown, the annular groove 4 refers to a closed-loop recessed area surrounding the axis of the lightweight pipe body 3, which can be achieved through machining, injection molding, or casting. The geometric characteristics of the annular groove allow the rigid connecting pipe 2 to be subjected to uniform force in the circumferential direction, avoiding loosening problems caused by local stress concentration.

[0034] The groove 4 is coaxially arranged with the lightweight pipe body 3, which ensures that the rigid connecting pipe 2 can be naturally aligned during installation, avoiding assembly errors caused by eccentricity, significantly improving assembly accuracy, and reducing possible misalignment during installation.

[0035] Specifically, the inner diameter of the groove 4 is larger than the inner diameter of the lightweight pipe body 3, providing additional space to accommodate the rigid connecting pipe 2. The stepped structure acts as a mechanical stop, which aims to limit the axial movement of the rigid connecting pipe 2, while enhancing the sealing performance, preventing fluid leakage, and significantly improving the reliability and durability of the piping system.

[0036] As an alternative implementation, see [link to implementation details]. Figure 8 As shown, the end of the rigid connecting pipe 2 abuts against the stepped surface 41 of the stepped structure, and the inner wall of the rigid connecting pipe 2 is coplanar with the inner wall of the lightweight pipe body 3.

[0037] See Figure 7 and Figure 8 As shown, the rigid connecting pipe 2 is in direct contact with the stepped surface 41 of the stepped structure, providing a solid mechanical support and sealing effect, preventing the risk of loose connection or leakage.

[0038] Meanwhile, the inner wall of the rigid connecting pipe 2 is smoothly aligned with the inner wall of the lightweight pipe body 3, ensuring continuous fluid flow in the pipeline, reducing turbulence and resistance, and thus optimizing the overall fluid dynamics performance. Furthermore, the close fit between the rigid connecting pipe 2 and the lightweight pipe body 3 not only solves the alignment problem but also significantly improves the reliability and durability of the pipeline system.

[0039] As an alternative implementation, see [link to implementation details]. Figures 6-8 As shown, the rigid connecting pipe 2 is an annular pipe, and the rigid connecting pipe 2 and the lightweight pipeline body 3 are arranged coaxially.

[0040] The annular pipe structure helps provide uniform support when connecting two lightweight pipe bodies 3, avoiding stress concentration or leakage risks caused by irregular shapes. Simultaneously, the coaxial arrangement not only improves fluid transmission efficiency but also promotes a compact overall structure, effectively reducing weight. Furthermore, the combination of the rigid connecting pipe 2 and the grooved structure 4 of the lightweight pipe body 3 further enhances the connection's strength and sealing, solving problems such as weak connections, poor sealing performance, and increased weight.

[0041] Through the above technical solutions, the overall structure not only meets the requirements for strength and environmental resistance, but also significantly improves the lightweight effect and assembly efficiency.

[0042] As an optional implementation, in this embodiment, see... Figures 5-8 The joint side of two adjacent half-pipes 1 is coated with a first adhesive part for bonding the two half-pipes 1; the joint side between two adjacent lightweight pipe bodies 3 is coated with a second adhesive part for bonding the two lightweight pipe bodies 3; the inner wall of the groove 4 is coated with a third adhesive part for fixing the lightweight pipe body 3 and the rigid connecting pipe 2.

[0043] The first adhesive layer refers to the bonding material applied to the joint side of two adjacent pipe halves 1. This material can be epoxy resin, polyurethane adhesive, or acrylic adhesive, and its purpose is to ensure a strong and seamless connection between the pipe halves 1. The second adhesive layer refers to the bonding material applied to the joint side of two adjacent lightweight pipe bodies 3. This material can be the same as or similar to the first adhesive layer, and its purpose is to provide a reliable interface connection, simplify the assembly process, and avoid the use of additional fixing devices. The third adhesive layer refers to the bonding material applied to the inner wall of the groove 4. This material can be high-temperature resistant, high-strength silicone or modified epoxy resin, and its purpose is to enhance the bonding strength between the rigid connecting pipe 2 and the lightweight pipe body 3, preventing loosening or detachment.

[0044] The first adhesive layer acts directly on the joint of the semi-pipe body 1, effectively filling any tiny gaps and avoiding delamination, a common problem in traditional splicing. The second adhesive layer provides a uniform and stable bonding interface for the splicing of lightweight pipe bodies 3, allowing multiple lightweight pipe bodies 3 to be quickly and reliably assembled into a single structure. The third adhesive layer, applied to the inner wall of the groove 4, significantly enhances the bonding force between the rigid connecting pipe 2 and the lightweight pipe body 3, while ensuring the sealing and durability of the connection. Furthermore, the application of these adhesive layers not only improves the overall structural stability of the pipeline but also greatly simplifies the manufacturing process, reducing the introduction of additional complex steps, thereby improving production efficiency and reliability.

[0045] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 2 As shown, the outer periphery of the joint between adjacent half-pipes 1 is coated with a first prepreg portion 5, which is used to fix the two half-pipes 1 after curing; the outer periphery of the joint between two adjacent lightweight pipeline bodies 3 is coated with a second prepreg portion 6, which is used to fix the two lightweight pipeline bodies 3 after curing.

[0046] See Figure 1 and Figure 2 As shown, the first prepreg section 5 can be a material layer pre-impregnated with resin, which can be achieved using epoxy resin prepreg, phenolic resin prepreg, etc. In practical applications, this prepreg section, by uniformly coating the outer periphery of the joint, ensures a firm bond at the joint of the half-pipe 1, preventing separation during curing or use. Its purpose is to significantly improve the fixing effect and anti-delamination ability.

[0047] See Figure 1 and Figure 2 As shown, the second prepreg part 6 can be understood as a material similar to the first prepreg part 5. It is also coated on the outer periphery of the joint to provide durable fixing force after curing, reduce the risk of delamination and simplify the overall process.

[0048] The above technical solution ensures uniform coverage and firm bonding at the joint of the half-pipes 1 by coating the outer periphery of the joint with the first prepreg 5, thus avoiding the problems of insufficient strength or poor curing effect that may result from adhesive fixing.

[0049] Simultaneously, a second prepreg portion 6 is coated around the joint between two adjacent lightweight pipe bodies 3, enhancing the stability and consistency of the connection area. Through the curing process, the first prepreg portion 5 and the second prepreg portion 6 respectively form a robust adhesive layer, significantly improving the reliability and durability of the overall structure.

[0050] The above structure, combined with the structure of the lightweight pipeline body 3 and the rigid connecting pipe 2, optimizes the fixing method, reduces the risk of delamination, and thus effectively solves the defect problems that may be caused by adhesive fixing.

[0051] For details, see Figure 1 As shown, the first prepreg section 5 and the second prepreg section 6 can both be strip-shaped. The first prepreg section 5 is a strip-shaped structure arranged along the axis of the lightweight pipeline body 3, and the second prepreg section 6 is an annular strip-shaped structure arranged around the axis of the lightweight pipeline body 3.

[0052] As an optional implementation, the radial cross-section of the semi-tube 1 is semi-circular or semi-elliptical.

[0053] The shape of the aforementioned semi-tube 1 ensures a tighter fit when the semi-tubes 1 are spliced ​​together, reducing gaps and stress concentrations caused by irregular shapes. The aim is to improve the sealing and mechanical strength of the joints, while simplifying mold design and manufacturing processes, and increasing production efficiency and consistency.

[0054] As an optional implementation, the wall thickness of the lightweight pipeline body 3 is 5.0-20.0 mm, and the width of the first prepreg part 5 and the second prepreg part is 25.4-50.8 mm.

[0055] The wall thickness of the lightweight pipe body 3 refers to the thickness range of its radial cross-section, which can be achieved using specific values ​​such as 5.0mm, 10.0mm, 15.0mm, or 20.0mm. The purpose is to ensure that the pipe meets lightweight requirements while possessing sufficient structural strength and environmental resistance, avoiding insufficient strength due to excessively thin walls or increased overall weight due to excessively thick walls. The width of the first prepreg section 5 and the second prepreg section refers to the width range of the prepreg covering the joint area, which can be achieved using specific values ​​such as 25.4mm, 30.0mm, 40.0mm, or 50.8mm. The purpose is to ensure that the prepreg section can fully cover the joint area, providing a strong adhesive bonding effect, while avoiding material waste due to excessive width or weak fixation due to insufficient width.

[0056] See Figure 9 and Figure 10 As shown, in this embodiment, the lightweight pipeline body 3 can withstand a bending force (three-point bend) greater than 230N and a compressive force greater than 400N. See also Figure 11 and Figure 12 As shown, the lightweight pipeline in this embodiment can withstand a bending force (three-point bend) greater than 640N and a compressive force greater than 730N.

[0057] Example 2: This embodiment provides a pipe forming method for manufacturing the aforementioned lightweight pipe. The method includes: pressing a PVDF sheet into a semi-pipe forming mold, heating it for a target time, and then cooling and shaping it into a semi-pipe body 1; fixing a portion of a rigid connecting pipe 2 into a groove 4 of one of the lightweight pipe bodies 3, fixing the remaining portion of the rigid connecting pipe 2 into a groove 4 of another lightweight pipe body 3, and then connecting and fixing the two lightweight pipe bodies 3; coating a first prepreg portion 5 around the seam between adjacent semi-pipe bodies 1, coating a second prepreg portion 6 around the seam between two adjacent lightweight pipe bodies 3, and then heating and curing to form the pipe.

[0058] Specifically, the main body of the pipeline can be understood as a tubular component composed of multiple modular structures, whose main function is to simplify the manufacturing process through modular design. Specifically, the lightweight pipeline body 3 can be achieved through injection molding, compression molding, or 3D printing technology, which can meet the needs of different materials and processes. For example, in injection molding, multiple semi-tubes 1 can be formed at once using a multi-cavity mold; in compression molding, the semi-tubes 1 can achieve the required shape and strength through hot pressing; in 3D printing, the semi-tubes 1 can be formed by layering materials according to the design documents. The pipe forming method of this embodiment replaces the multi-layer prepreg laying and high-temperature curing steps of traditional composite pipes by heating and cooling PVDF sheet to shape it into a semi-pipe 1, which significantly shortens the manufacturing cycle of the semi-pipe 1. At the same time, the embedded structure of the groove 4 and the rigid connecting pipe 2 realizes the synchronous positioning of both ends and simplifies the assembly operation, avoiding the cumbersome process of processing the basic pipe and the coating layer in separate steps. In addition, by utilizing the rapid curing characteristics of the first prepreg part 5 and the second prepreg part 6, the joint sealing and reinforcement are completed by heating in one go, eliminating the traditional additional coating layer addition process, thereby greatly reducing the production steps and improving the overall efficiency.

[0059] The pipe forming method of this embodiment effectively solves the problems of complicated forming process, long production cycle and high production cost caused by the additional covering structure in the prior art, while meeting the requirements of aircraft pipe system for strength, environmental resistance and lightweight.

[0060] The specific molding method is as follows: 1. Cut the PVDF sheet according to the product size requirements (leaving a margin). After cutting, place the sheet flat on the semi-tube forming mold. Put it in the oven and heat the mold to 150℃ and keep it at that temperature for 5 minutes (the PVDF sheet will undergo thermal deformation due to the high temperature of the mold). After the holding time is sufficient, take out the mold, let the semi-tube cool and set, and trim off the excess material at the edges. 2. First, glue the two half-pipes 1 together and remove any excess glue from the joint. Then, glue the rigid connecting pipe 2 at the joint to the corresponding position and wait for the glue to fully cure.

[0061] 3. Apply the first prepreg 5 to the outer periphery of the joint between adjacent half-pipes 1, and apply the second prepreg 6 to the outer periphery of the joint between two adjacent lightweight pipe bodies 3. Place in an oven to cure, and the pipe body is formed.

[0062] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0063] 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 the present invention. 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.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A light-weighted pipe characterized by comprising: The light-weight pipeline body is formed by splicing and fixing at least two half-pipeline bodies, and a groove is arranged in the connecting end of the light-weight pipeline body. The groove is an annular groove arranged coaxially with the light-weight pipeline body. The inner diameter of the groove is larger than the inner diameter of the light-weight pipeline body, and a stepped structure is formed at the connecting position between the groove and the light-weight pipeline body.

2. The light-weighted pipe according to claim 1, characterized by The end of the hard connecting pipe abuts against the stepped surface of the stepped structure, and the inner wall of the hard connecting pipe is coplanar with the inner wall of the light-weight pipeline body. The hard connecting pipe is an annular pipe arranged coaxially with the light-weight pipeline body.

3. The light-weighted pipe according to claim 2, characterized by The splicing joint between adjacent two half-pipeline bodies is coated with a first adhesive part for bonding the two half-pipeline bodies.

4. The light-weighted pipe according to claim 1, characterized by The splicing joint between adjacent two light-weight pipeline bodies is coated with a second adhesive part for bonding the two light-weight pipeline bodies.

5. The light-weighted pipe according to claim 1, characterized by The inner wall of the groove is coated with a third adhesive part for fixing and connecting the light-weight pipeline body and the hard connecting pipe. The outer periphery of the splicing joint between adjacent two half-pipeline bodies is coated with a first prepreg part for fixing the two half-pipeline bodies after curing and forming. The outer periphery of the splicing joint between adjacent two light-weight pipeline bodies is coated with a second prepreg part for fixing the two light-weight pipeline bodies after curing and forming.

6. The light-weighted pipe according to claim 1, characterized by The radial cross section of the half-pipeline body is semicircular or semi-elliptical. The half-pipeline body is made of PVDF material.

7. The light-weighted pipe according to claim 1, characterized by The wall thickness of the light-weight pipeline body is 5.0-20.0 mm, and the width of the first prepreg part and the second prepreg part is 25.4-50.8 mm.

8. The light-weighted pipe according to claim 1, characterized by The method for manufacturing the light-weight pipeline according to any one of claims 1-8 comprises the following steps:

9. The light-weighted pipe according to claim 6, characterized by Pressing a PVDF plate into a half-pipeline forming die, cooling and setting after heating for a target time to form the half-pipeline body; 10. A method of forming a tube, characterized by, Fixing a part of the hard connecting pipe in the groove of one of the light-weight pipeline bodies and fixing the remaining part of the hard connecting pipe in the groove of the other light-weight pipeline body, and then connecting and fixing the two light-weight pipeline bodies; Coating the first prepreg part on the outer periphery of the splicing joint between adjacent two half-pipeline bodies and coating the second prepreg part on the outer periphery of the splicing joint between adjacent two light-weight pipeline bodies, and then curing and forming. ​ ​

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