Pressure-proof special-shaped flow guide pipe for vacuum infusion forming

Abstract

The utility model relates to the technical field of vacuum infusion, in particular to an anti-pressure special-shaped flow guide pipe for vacuum infusion forming, which comprises a flow guide pipe body and a flow guide cavity, the upper end of the flow guide pipe body is circular, the bottom of the flow guide pipe body is inferior arc-shaped, and an arc-shaped base plate extends from the edge of the bottom of the flow guide pipe body in the direction close to the flow guide cavity. According to the pressure-resistant special-shaped flow guide pipe for vacuum infusion molding, the special-shaped flow guide pipe is arranged, so that resin in the special-shaped flow guide pipe flows out of the spiral notch along the inferior arc surface and the flow guide groove, the flow guide efficiency is high, and residual accumulated resin is reduced. Meanwhile, under the action of vacuum negative pressure, the inferior arc surface of the special-shaped flow guide pipe is extended to form an arc-shaped base plate, so that the contact area, namely the stress area, of the special-shaped pipe and laying fibers is large, the stressed force is dispersed to a larger area, the pressure intensity is reduced, and pipe marks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum infusion, in particular to a pressure-proof special-shaped flow guide tube for vacuum infusion molding. Background Art

[0002] The dual carbon goals not only signal a deepening global commitment to environmental protection and sustainable development, but also present unprecedented development opportunities and promising prospects for the wind power industry. With continuous technological breakthroughs and improved market mechanisms, China's wind power industry has entered the era of cost parity. From a feasibility perspective, wind power, with its abundant resource reserves, clean power generation process, and increasingly mature industrial chain, remains a key renewable energy source for large-scale deployment, replacing fossil fuels and driving energy transition.

[0003] The draft tube is an auxiliary material used in the molding process of FRP products and is one of the key components in vacuum infusion systems. During vacuum infusion, resin, driven by atmospheric pressure differences, diffuses through the draft tube throughout the mold cavity, resulting in a lightweight, high-strength FRP product. However, after forming and curing, traditional circular draft tubes leave visible marks on the inner surface of the FRP product. This also creates a large amount of resin deposits within the draft tube, making it difficult to clean and resulting in significant solid waste. These characteristics increase processing time and costs for FRP products.

[0004] Most existing molding and injection pipelines are guide pipes, with main pipes and branch pipes arranged on fiberglass cloth to achieve flow diversion in the mold cavity. For example, CN202410012071.7 discloses a method for preparing a polyurethane composite material. In accordance with the process sequence of vacuum infusion molding, auxiliary materials such as reinforcement materials and guide pipes are laid, and a polyurethane composite material with excellent mechanical properties and waterproof properties is successfully prepared. In order to improve the problem of large amounts of resin accumulation, CN202022855166.5 discloses a porous anti-indentation Ω guide pipe. By setting a guide slope around the guide hole, the resin in the Ω pipe flows along the guide slope to the guide hole, reducing the resin residue in the Ω pipe. CN202122183692.6 discloses an iron tooth anti-indentation guide pipe. By setting a connecting rod, a connecting cylinder and a top bolt, the height of the discharge hole can be adjusted to facilitate casting. CN202410635523.7 discloses a fully automatic vacuum infusion method and system for fan blades. Carbon nanosensor layers are integrated with conductive impedance tomography to accurately reflect the detailed changes in the infusion process, and infrared thermal imagers are combined to achieve accurate estimation of the resin curing degree, thereby reducing production costs and avoiding large amounts of resin accumulation. However, this method has not yet been widely popularized.

[0005] Therefore, those skilled in the art urgently need to provide a pressure-proof special-shaped guide tube for vacuum infusion molding to solve technical problems such as obvious tube marks, large amounts of glue accumulation in the tube, and long processing time. Utility Model Content

[0006] The utility model aims to provide a pressure-proof special-shaped guide tube for vacuum infusion molding, which solves the technical problems of obvious tube marks, large amounts of glue accumulation in the tube, long processing time, etc.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a pressure-proof special-shaped guide tube for vacuum infusion molding, including a guide tube body and a guide cavity. The upper end of the guide tube body is circular and the bottom is a bad arc. The bottom edge of the guide tube body extends into an arc-shaped pad close to the direction of the guide cavity.

[0008] Preferably, a plurality of evenly distributed hollow spiral cutouts are distributed on the upper end of the guide tube body.

[0009] Preferably, the angle of the hollow spiral cut is 60°, the spacing between the hollow spiral cuts is 0.3-0.4 mm, and the spacing between adjacent cuts is 10-20 mm.

[0010] Preferably, the inner side wall and the upper wall of the guide cavity are provided with strip-shaped guide grooves extending along the guide cavity.

[0011] Preferably, the depth of the guide groove is 0.5-0.7 mm, the width of the guide groove is 0.1-0.2 mm, and the spacing between adjacent grooves is 2.5-3 mm.

[0012] Preferably, the guide tube body is made of one of PE, PP, PVC and nylon.

[0013] Preferably, the outer diameter of the flow guide tube body is 10.5-16 mm, the thickness of the tube wall is 1.0-1.1 mm, and the height is 9-11.5 mm.

[0014] Preferably, the arc-shaped pad has a width of 1.4-2 mm and a thickness of 1.0-1.1 mm.

[0015] Preferably, the central angle corresponding to the minor arc of the guide tube body is 25.56-30.76°.

[0016] Preferably, the arrangement spacing between adjacent special-shaped flow guide pipes is 300-400 mm.

[0017] The technical effects and advantages of this utility model are:

[0018] 1. The pressure-resistant, shaped guide tube for vacuum infusion molding in this utility model is arranged so that the resin in the shaped guide tube flows out from the spiral cutout along the inferior arc surface and guide grooves, achieving high diversion efficiency and reducing residual resin buildup. Simultaneously, under the action of vacuum negative pressure, the inferior arc surface of the shaped guide tube is extended to form an arc-shaped pad, increasing the contact area between the shaped tube and the laminated fibers. This increases the force-bearing area, dispersing the applied force over a larger area, reducing pressure and thus alleviating tube marks.

[0019] 2. The guide channel in the present invention is in the shape of a spiral cut, and the resin is filled in the special-shaped tube channel. The resin overflows and diffuses along the guide groove through the bevel cut gap, which is beneficial to the resin diversion, reduces the process and improves the production efficiency. In addition, it has the advantages of being soft and wear-resistant, having good tensile strength, being easy to connect with the vacuum tube, and being easy to form and process, which facilitates the preparation of complex FRP products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the pipe layout of the special-shaped guide pipe in the utility model;

[0021] Figure 2 This is a schematic structural diagram of the special-shaped flow guide pipe in the present utility model;

[0022] Figure 3 This is a schematic diagram of the bottom cutout of the special-shaped flow guide pipe in the present invention;

[0023] Figure 4 This is a front view structural diagram of the special-shaped flow guide pipe in the present utility model;

[0024] Figure 5 yes Figure 4 Schematic diagram of the middle AA section;

[0025] Figure 6 This is a schematic diagram of the second structure of the special-shaped guide tube;

[0026] Figure 7 yes Figure 6 The main view of the special-shaped guide tube.

[0027] in, Figure 1-Figure 7 middle:

[0028] 10. Special-shaped guide tube; 20. Glue injection seat; 30. Mold; 40. Fiberglass cloth laying;

[0029] 1. Guide tube body; 2. Guide cavity; 3. Inferior arc; 4. Arc pad; 5. Hollow spiral cut; 6. Guide groove. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, Figure 1 It is a schematic diagram of the pipe layout of the special-shaped guide pipe in the present invention, including a special-shaped guide pipe 10, a glue injection seat 20, a mold 30, and a layer of glass fiber cloth 40; the arrangement spacing between adjacent special-shaped guide pipes 10 is 300-400mm.

[0032] like Figure 2-5 As shown, the utility model provides a pressure-proof special-shaped guide tube for vacuum infusion molding, including a guide tube body 1 and a guide cavity 2. The upper end of the guide tube body 1 is circular, and the bottom is a bad arc 3. The bottom edge of the guide tube body 1 extends toward the direction of the guide cavity 2 to form an arc-shaped pad 4.

[0033] The upper end of the guide tube body 1 is equipped with several evenly spaced hollow spiral cutouts 5. The angle of the hollow spiral cutouts 5 is 60°, the spacing between them is 0.3-0.4mm, and the spacing between adjacent cutouts is 10-20mm. Because the guide channel is spirally cut, resin fills the shaped tube channel and spreads along the guide grooves through the angled cutouts. This facilitates resin diversion, reduces process steps, and improves production efficiency. Furthermore, the material is soft, wear-resistant, has excellent tensile strength, is easily connected to vacuum tubes, and is easily molded, making it convenient for the production of complex fiberglass reinforced plastic products.

[0034] At the same time, the inner side wall and upper wall of the guide cavity 2 are provided with strip guide grooves 6 extending along the guide cavity 2; the depth of the guide grooves 6 is 0.5-0.7mm, the width of the guide grooves 6 is 0.1-0.2mm, and the spacing between adjacent grooves is 2.5-3mm.

[0035] The flow guide tube body 1 in this embodiment is made of one of PE, PP, PVC, and nylon, and has an outer diameter of 10.5-16 mm, a wall thickness of 1.0-1.1 mm, and a height of 9-11.5 mm.

[0036] In addition, the central angle of the inferior arc 3 of the guide tube body is 25.56-30.76°; the width of the arc pad 4 is 1.4-2 mm, and the thickness is 1.0-1.1 mm.

[0037] like Figure 6 、 7 As shown, the bottom edge of the guide tube body 1 extends into an arc-shaped pad 4 close to the guide cavity. Figure 2-5 In contrast, Figure 2-5 The bottom of the arc-shaped pad 4 is arc-shaped, Figure 6 、 7The bottom of the arc-shaped pad 4 is flat. Figure 2-5 The bottom of the diversion cavity is arc-shaped. Figure 6 、 7 The bottom of the middle diversion cavity is inclined.

[0038] Example 1

[0039] The outer diameter of the guide tube is 12mm, the tube thickness is 1mm, the spacing between the hollow spiral cuts is 0.3mm, and the spacing between adjacent cuts is 10mm. The circular nylon guide tubes are spaced 300mm apart and made of fiberglass reinforced plastic using vacuum infusion. The circular guide tubes have a small contact area with the fiberglass cloth, resulting in high pressure and obvious tube marks.

[0040] Example 2

[0041] A PE special-shaped flow guide tube without a backing plate was selected. Its outer diameter was 16 mm, its thickness was 1 mm, its height was 11.5 mm, its inferior arc central angle was 25.56°, the spacing between the hollow spiral cuts was 0.3 mm, and the spacing between adjacent cuts was 10 mm. The flow guide tubes were arranged at 300 mm intervals and fabricated using vacuum infusion. The inferior arc surface has a larger contact area with the fiber layer, which means a larger force-bearing area. This distributes the force over a larger area, reducing pressure and thus reducing pipe marks. However, the 16 mm outer diameter flow guide tube exhibits more severe adhesive buildup than the 12 mm outer diameter tube.

[0042] Example 3

[0043] The special-shaped guide tube has a tube body and an arc-shaped pad. The inner wall of the tube 1 has an integrally formed hollow spiral cut and guide groove. The connection between the tube body and the arc-shaped pad is provided with a rounded corner to reduce stress concentration. The outer diameter of the tube body is selected to be 12mm, the tube diameter thickness is 1mm, the height is 9mm, and the central angle of the inferior arc bottom is 30.76°. The width of the arc-shaped pad is 1.4mm and the thickness is 1mm. The spacing of the hollow spiral cut is 0.3mm, the spacing between adjacent cuts is 10mm, and there are grooves with a depth of 0.5mm, a width of 0.1mm, and an adjacent spacing of 2.54mm. The special-shaped PE guide tube composed of the above is arranged at a spacing of 300mm, and the glass fiber reinforced plastic is prepared by the vacuum infusion method. On the basis of Example 2, the inferior arc bottom is extended as the pad of the tube, and the guide groove is added so that the glass fiber reinforced plastic product not only reduces the pipe mark but also reduces the amount of glue accumulation.

[0044] The test results of the above embodiments 1-3 are shown in Table 1:

[0045] Table 1 Test results of pressure-resistant special-shaped flow guide tubes for vacuum infusion molding of Examples 1-3

[0046] 1m diversion pipe weight Weight of 1m flow guide pipe after glue injection Injection resin flow rate Tube seal in conclusion Example 1 33.5g 83.5g / 50g glue 30min Obvious pipe marks Not adopted Example 2 37.7g 127.5g / 90g glue 30min Slight pipe marks Not adopted Example 3 40.2g 73.2g / 33g glue 30min Slight pipe marks use

[0047] In summary, the pressure-resistant, shaped guide tube for vacuum infusion molding in this utility model, through the arrangement of the shaped guide tube, allows the resin within the shaped guide tube to flow out through the spiral cutout along the inferior arc surface and guide grooves, resulting in high diversion efficiency and reduced resin residue and buildup. Furthermore, under the action of vacuum negative pressure, the shaped guide tube extends the inferior arc surface to form an arc-shaped backing plate, increasing the contact area between the shaped tube and the laminated fibers. This increases the force-bearing area, distributing the applied force over a larger area, reducing pressure and thus alleviating tube marks.

[0048] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A pressure-proof special-shaped guide tube for vacuum infusion molding, characterized in that: The utility model comprises a guide tube body and a guide cavity. The upper end of the guide tube body is circular and the bottom is a bad arc. The bottom edge of the guide tube body extends into an arc-shaped pad close to the guide cavity.

2. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The upper end of the guide tube body is provided with a plurality of evenly distributed hollow spiral cutouts.

3. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 2, characterized in that: The angle of the hollow spiral cut is 60°, the spacing between the hollow spiral cuts is 0.3-0.4 mm, and the spacing between adjacent cuts is 10-20 mm.

4. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The inner side wall and the upper wall of the guide cavity are provided with a strip-shaped guide groove extending along the guide cavity.

5. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 4, characterized in that: The depth of the guide groove is 0.5-0.7 mm, the width of the guide groove is 0.1-0.2 mm, and the spacing between adjacent grooves is 2.5-3 mm.

6. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The guide tube body is made of one of PE, PP, PVC and nylon.

7. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 6, characterized in that: The outer diameter of the flow guide tube body is 10.5-16 mm, the thickness of the tube wall is 1.0-1.1 mm, and the height is 9-11.5 mm.

8. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The width of the arc-shaped pad is 1.4-2 mm, and the thickness is 1.0-1.1 mm.

9. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The central angle of the inferior arc of the guide tube body is 25.56-30.76°.

10. The pressure-proof special-shaped flow guide tube for vacuum infusion molding according to claim 1, characterized in that: The arrangement spacing between adjacent special-shaped guide pipes is 300-400mm.

Images