Film composite pipeline and preparation method thereof

Abstract

The present invention relates to a film composite pipe and its preparation method for use in high-altitude environments. The purpose is to provide a film composite pipe with excellent mechanical properties, strong airtightness, and easy storage, and its preparation method. The film composite pipe comprises a fabric hose assembly, which includes an outer membrane and an inner framework. The outer membrane is made of a polyester-polyurethane composite material. Multiple sheets of polyester-polyurethane composite material are spirally stacked and sewn into a cylindrical shape. Polyurethane film is applied to the sewn seams. The ends of the fabric hose assembly are connected to quick-connect assemblies.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline processing, and in particular to a film composite pipeline and a preparation method thereof. Background Art

[0002] Pipes are a common connection structure, but pipes used in specialized applications often have higher performance requirements. For example, pipes used in high-altitude or aviation equipment have higher requirements for vibration resistance, airtightness, and collapsed volume than pipes used in ordinary environments.

[0003] A commonly used ventilation duct for harsh operating conditions is aluminum foil insulated spiral ducting. Compared to rigid ducting, this type of ducting offers adjustable length due to its structural characteristics, allowing it to bend freely within the required turning radius, saving installation space. It also offers lighter weight, reduced flow resistance and flutter noise, and a high degree of standardization, allowing for quick installation and excellent sealing performance. However, this type of ducting still has certain drawbacks. First, while this type of ducting structure is adequate for ordinary use, it is often unable to withstand the harsh mechanical conditions of high altitude. Second, the spiral ducting utilizes spiral wire as structural support. Due to the elasticity of the wire, the ducting volume is limited, making frequent installation and storage difficult and prone to damage. Third, given the long-term reliability and airtightness requirements of ventilation ducting, aluminum foil ducting has a short service life and is difficult to repair if damaged. Furthermore, while aluminum foil ducting can meet ventilation needs, leakage issues can reduce ventilation system efficiency as the space increases. Therefore, the previous aluminum foil spiral ducting is no longer suitable for current high-altitude operations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a film composite pipeline with good mechanical properties, strong air tightness and easy storage, and a preparation method thereof.

[0005] One of the technical solutions provided by the present invention is a film composite pipeline, including a cloth hose assembly, which includes an outer membrane and an internal skeleton. The outer membrane is made of a polyester polyurethane composite material. Multiple pieces of polyester polyurethane composite materials are spirally stacked and sewn into a cylindrical shape. A polyurethane film is provided at the sewing seam. The two ends of the cloth hose assembly are respectively connected to the quick connector assembly.

[0006] The adhesive film composite pipeline of the present invention, wherein the internal skeleton comprises a titanium wire ring, and the titanium wire ring is fixedly connected to the outer film.

[0007] In the adhesive film composite pipeline of the present invention, the outer side of the titanium wire ring is wrapped with a polyurethane adhesive layer.

[0008] In the adhesive film composite pipeline of the present invention, the titanium wire ring and the outer film are connected by a high-frequency welding process.

[0009] In the adhesive film composite pipeline of the present invention, the polyurethane film and the outer film are connected by a hot air stripping process.

[0010] In the adhesive film composite pipeline of the present invention, the quick connector assembly is provided with a quick disconnect structure, and a plurality of connection points are evenly distributed on the surface of the quick disconnect structure.

[0011] In the adhesive film composite pipeline of the present invention, the quick disconnect structure and the quick connector assembly form a groove, and a sealing ring is installed inside the groove.

[0012] In the adhesive film composite pipeline of the present invention, a convex structure is provided on the rear side of the connection between the quick connector assembly and the cloth hose assembly, and a clamp is installed on the outer side of the convex structure.

[0013] Another technical solution provided by the present invention is a method for preparing a film composite pipeline, comprising the following steps:

[0014] S1, material preparation, obtaining multiple polyester polyurethane composite materials;

[0015] S2, sewing, multiple pieces of polyester polyurethane composite material are sewed into a tube shape by spiral stacking;

[0016] S3, hot air taping, uses a hot air sealing machine to hot air fix the polyurethane film to the sewing line position of the outer film;

[0017] S4, titanium ring fixation, the surface of the titanium wire ring part is coated with polyurethane adhesive, and after it is left to stand and solidify, the titanium wire ring part is inserted into the inner part of the outer film, and the inserted titanium wire ring part is re-melted and solidified using a pressing machine to form a cloth hose assembly;

[0018] S5, joint bonding, using silicone rubber to bond and fix the quick connector assembly to the fabric hose assembly;

[0019] S6, Clamp Assembly, assemble the clamp onto the outside of the convex circle on the quick connector assembly.

[0020] In the method for preparing the adhesive film composite pipeline of the present invention, the material preparation process in step S1 includes plate making, inspection and cutting.

[0021] The difference between the adhesive film composite pipeline and its preparation method of the present invention and the existing technology is that the cloth hose assembly of the adhesive film composite pipeline of the present invention is spirally sewn, and the fabricated cloth hose assembly has seams evenly distributed in the radial direction of the ventilation duct, which will not affect the storage of the ventilation duct and can store the duct into a smaller volume; the outer membrane of the cloth hose assembly is made of polyester polyurethane composite material, and a polyurethane film is provided at the sewing seam position, which can achieve high air tightness and low flow resistance of the ventilation duct; an internal skeleton is provided inside the outer membrane to meet the requirements of the pipeline's mechanical resistance and other requirements.

[0022] The preparation method of the film composite pipeline of the present invention reduces the compressed volume of the ventilation pipeline through the spiral sewing processing technology. The compressed ventilation pipeline can be laid out and implemented according to the limited cabin conditions, thereby reducing the production cost of the aircraft; through steps such as hot air strips and titanium ring fixation, the air tightness of the pipeline is enhanced, the flow resistance of the pipeline is reduced, and the mechanical properties of the pipeline are improved.

[0023] The adhesive film composite pipeline and the preparation method thereof of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the film composite pipeline of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a cloth hose assembly in a film composite pipeline according to the present invention;

[0026] Figure 3 Schematic diagram of the structure of the quick connector assembly in the film composite pipeline of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the film composite pipeline of the present invention in an unfolded state;

[0028] Figure 5 This is a schematic structural diagram of the film composite pipeline of the present invention in a folded state;

[0029] Figure 6 This is a schematic diagram of the structure of the film composite pipe after folding when using linear sewing;

[0030] Figure 7 This is a schematic structural diagram of the titanium wire ring installed in the film composite pipeline of the present invention;

[0031] Figure 8 This is a process flow chart of the method for preparing the adhesive film composite pipeline of the present invention;

[0032] The markings in the figure are as follows: 1-clamp; 21-sealing ring; 22-quick connector assembly; 221-quick disconnect structure; 222-connection point; 223-convex structure; 3-cloth hose assembly; 31-polyester polyurethane composite material; 32-polyurethane film; 33-polyurethane adhesive layer; 34-titanium wire ring; 41-upper hot pressing fixture; 42-lower hot pressing fixture. DETAILED DESCRIPTION

[0033] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] Example 1

[0035] like Figure 1As shown, the film composite pipeline of the present invention includes a clamp 1, a sealing ring 21, a quick connector assembly 22 and a cloth hose assembly 3.

[0036] like Figure 2 As shown, the fabric hose assembly 3 is the main structure of the composite pipeline, providing airflow and airtightness. The fabric hose assembly 3 is a cylindrical structure, consisting of an outer membrane and an internal skeleton. The outer membrane is made of a polyester-polyurethane composite material 31. Multiple sheets of polyester-polyurethane composite material 31 are spirally stacked and sewn into a cylindrical shape. The polyester-polyurethane composite material 31 is made by laminating a polyester base fabric and a polyurethane film. The polyester base fabric is woven from 200D polyester yarn with a warp and weft density of 284 x 188 yarns / 10cm. The polyurethane film comprises 85-92% by weight of the polyurethane main body, 3-7% by weight of the anti-aging agent, and 5-8% by weight of the masterbatch. The melt viscosity of the laminate is 600-1000 MPa·s / 25°C. To ensure airtightness at the sewn seams, a polyurethane film 32 is applied to the sewn seams using a hot air taping process, forming a highly airtight cylindrical structure with an inner wall entirely made of polyurethane. The hot air process temperature is 470±10℃, the speed is 1.8±0.2m / min, and the pressure is 0.3±0.1MPa. Relying on the low surface roughness of the polyurethane material, low flow resistance is achieved.

[0037] The inner frame includes a titanium wire ring 34, which is a 2mm diameter annealed TC4 titanium wire welded into a ring by vacuum welding. Before being connected to the outer membrane, the titanium wire ring 34 is first dipped in polyurethane glue to form a polyurethane glue layer 33. Figure 7 As shown, after the glue-impregnated titanium wire ring 34 solidifies, it is inserted into the tubular structure of the fabric hose assembly 3. It is then clamped by upper and lower hot-pressing fixtures 41 and 42 and welded to the inner wall of the outer membrane via high-frequency welding, forming a stable fabric hose assembly 3. The high-frequency welding process is performed at a temperature of 180±5°C and for a time of 20±2 seconds. One titanium wire ring 34 is evenly spaced every 100 mm.

[0038] In this embodiment, the fabric hose assembly 3 adopts spiral sewing instead of linear sewing. The reason is that linear sewing will cause all the sewing seams to overlap on the axis of the cylindrical structure. When the seams are stored, the overlapping will cause the folded thickness on both sides of the ventilation duct to be uneven. Figure 6 As shown, it cannot be compressed to the minimum volume and has a poor appearance after storage; Figure 4 and Figure 5 As shown, the spiral sewing process evenly distributes the seams in the radial direction of the ventilation duct, which will not affect the storage of the ventilation duct.

[0039] like Figure 3As shown, both ends of the fabric hose assembly 3 are connected to quick connector assemblies 22. In this embodiment, the fabric hose assembly 3 and quick connector assemblies 22 are glued together. The quick connector assemblies 22 are integrally formed from 2A12 aluminum alloy and can be securely connected to corresponding fan or pipeline interfaces to ensure airtightness. The quick connector assemblies 22 can be configured as straight, 90°, or any angle, depending on the installation space or usage requirements, facilitating installation and reducing flow resistance.

[0040] The quick-disconnect assembly 22 is equipped with a quick-disconnect structure 221. Multiple connection points 222 are evenly distributed on the surface of the quick-disconnect structure 221, facilitating connection with the fan and pipeline. The quick-disconnect structure 221 and the quick-disconnect assembly 22 form a groove, within which the sealing ring 21 is installed. In this embodiment, the sealing ring 21 is an elastic sealing ring. The elastic sealing ring is glued or vulcanized into the groove formed by the quick-disconnect structure 221 and the quick-disconnect assembly 22.

[0041] A convex structure 223 is provided on the rear side of the quick connector assembly 22 where it connects to the fabric hose assembly 3. The clamp 1 is mounted on the outside of the convex structure 223 to fasten and seal the quick connector assembly 22 and the fabric hose assembly 3. In this embodiment, the clamp 1 is a stainless steel worm clamp 1.

[0042] The film composite pipeline of the present invention has a compact structure and light weight. It adopts a cloth hose assembly 3 made of polyester polyurethane composite material 31, polyurethane film 32, and titanium wire ring 34 parts to achieve the requirements of high air tightness, low flow resistance, and mechanical resistance of the ventilation pipeline.

[0043] Example 2

[0044] The preparation method of the film composite pipeline of the present invention is as follows: Figure 7 As shown, the following steps are included:

[0045] 1. Material preparation stage, including:

[0046] S10, plate making, technicians complete the production sample drawing, printing, cutting and other work according to the design drawings;

[0047] S20, Inspection: Inspectors shall inspect the sample size, seam reserve size, etc. according to the design drawings and technical requirements. Samples with out-of-tolerance size or structural errors shall be discarded and re-made. Complete sample inspection records shall be kept;

[0048] S30, cutting. After the production line operator confirms the appearance of the raw materials, they will mark, cut, and drill holes in the raw materials according to the qualified template. The cutting process should ensure that the appearance and size of the cut pieces are the same as the template, and the cut pieces are free of stains, holes, and burrs. Velcro and webbing parts are cut using a tape cutting machine to ensure there are no burrs, and all the corners of the Velcro are rounded;

[0049] 2. Pipeline processing stage, including:

[0050] S40, Sewing. Production line operators complete the sewing of product tubes and accessory ribbons according to the design drawings. The sewing process should meet the requirements that the semi-finished product has a full appearance, natural curves, is straight, neat and clean, and the length of exposed thread ends is ≤3mm; the fabric is smooth and regular, without cracks, broken warps, broken wefts, skipped stitches, or loose edges; the stitching track is consistent, the stitches are straight, and the stitch length is consistent; no empty stitches, missed stitches, or skipped stitches are allowed; no skewed stitches are allowed. The hook and loop fasteners are sewn on the outer surface of the soft bag, and the overall appearance is smooth and regular, without wrinkles or skews;

[0051] S50, hot air stripping, the production line operator uses the hot air sealing machine according to the drawing requirements to fix the polyurethane film 32 on the sewing line position of the tube blank with hot air. The hot air process temperature is 470±10℃, the speed is 1.8±0.2m / min, and the pressure is 0.3±0.1Mpa;

[0052] S60, titanium ring fixed, production line operators coated the surface of titanium wire ring 34 parts with polyurethane adhesive according to the drawing requirements, let it stand for 24 hours to allow its surface to solidify, and then the parts were inserted into the air duct blank with an axial spacing of 100mm. The inserted titanium wire ring 34 parts were re-melted and solidified using a hot press, with a welding temperature of 180±5℃ and a welding time of 20±2s.

[0053] S70, joint bonding: Production line operators use GD414 silicone rubber to bond the quick connector assembly 22 to the tube assembly according to the drawing requirements. Before bonding, the tube length is preliminarily checked to ensure it meets the product performance requirements. After bonding, the residual silicone rubber inside the tube is cleaned.

[0054] S80, Clamp 1 Assembly: The production line operator assembles and fixes the clamp 1, covering belt, adjustment belt, etc. to the bonding area between the air duct and the quick connector according to the drawings and technical requirements. The assembly position is located outside the marking line of the quick connector assembly 22, and the self-locking screws of the clamp 1 are tightened.

[0055] 3. Finished product inspection stage, including:

[0056] S90, Inspection: Inspectors conduct performance index tests on products based on technical conditions and relevant drawings.

[0057] The above preparation method involves a range of process parameters. Five samples are used below to verify the reliability of the above method.

[0058]

[0059] It can be seen from the above table that the film composite pipeline prepared by the preparation method of the present invention meets the airtightness requirements for use in a high-altitude working environment.

[0060] The preparation method of the adhesive film composite pipeline of the present invention reduces the compressed volume of the ventilation pipeline through the spiral sewing processing technology. The compressed ventilation pipeline can be laid out and implemented at high altitude or within limited aviation conditions, thereby reducing the production cost of the aircraft.

[0061] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A film composite pipeline, characterized by: It includes a cloth hose assembly, which includes an outer membrane and an internal skeleton. The outer membrane is made of polyester polyurethane composite material. Multiple pieces of polyester polyurethane composite material are spirally stacked and sewn into a cylindrical shape. A polyurethane film is provided at the sewing seam. The internal skeleton includes multiple titanium wire rings. The multiple titanium wire rings are fixedly connected to the outer membrane, and the multiple titanium wire rings are evenly distributed on the inner surface of the cylindrical structure formed by the outer membrane along the radial direction of the cylindrical structure. The two ends of the cloth hose assembly are respectively connected to the quick connector assembly.

2. The film composite pipeline according to claim 1, characterized in that: The outer side of the titanium wire ring is wrapped with a polyurethane adhesive layer.

3. The film composite pipeline according to claim 1, characterized in that: The titanium wire ring and the outer film are connected by a high-frequency welding process.

4. The film composite pipeline according to claim 1, characterized in that: The polyurethane film and the outer film are connected by a hot air stripping process.

5. The film composite pipeline according to claim 1, characterized in that: The quick connector assembly is provided with a quick disconnect structure, and a plurality of connection points are evenly distributed on the surface of the quick disconnect structure.

6. The film composite pipeline according to claim 5, characterized in that: The quick disconnect structure and the quick connector assembly form a groove, and a sealing ring is installed inside the groove.

7. The film composite pipeline according to claim 5, characterized in that: The quick connector assembly is provided with a convex structure on the rear side of the connection with the cloth hose assembly, and a clamp is installed on the outer side of the convex structure.

8. A method for preparing a film composite pipeline, characterized in that: The following steps are involved: S1, material preparation, obtaining multiple polyester polyurethane composite materials; S2, sewing, multiple pieces of polyester polyurethane composite material are sewed into a tube shape by spiral stacking; S3, hot air taping, uses a hot air sealing machine to hot air fix the polyurethane film to the sewing line position of the outer film; S4, titanium ring fixation, the surface of the titanium wire ring part is coated with polyurethane adhesive, and after it is left to stand and solidify, the titanium wire ring part is inserted into the inner part of the outer film, and the inserted titanium wire ring part is re-melted and solidified using a pressing machine to form a cloth hose assembly; S5, joint bonding, using silicone rubber to bond and fix the quick connector assembly to the fabric hose assembly; S6, Clamp Assembly, assemble the clamp onto the outside of the convex circle on the quick connector assembly.

9. The method for preparing a film composite pipeline according to claim 8, characterized in that: The material preparation process in step S1 includes plate making, inspection and cutting.

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