Air guide chain, autoclave packaging bag with air guide chain

Abstract

The present invention discloses an air guide chain, wherein a unit chain link is a geometric body, having a bottom surface capable of being placed stably, a front profile and a rear profile above the bottom surface, a first air channel is provided between the front profile and the rear profile in the geometric body, the first air channel forms a first air hole A on the front profile and a first air hole B on the rear profile, a second air channel is provided between two interval points on the rear profile other than the first air hole B in the geometric body, the second air channel forms a second air hole A and a second air hole B on the rear profile; at least two unit chain links are connected in series in sequence by connecting pieces passing through the first air channel, the first air channels of adjacent unit chain links are butted front and back and annularly sealed to form an air guide chain; at the same time, an autoclave packaging bag with an air guide chain is disclosed. The air guide chain can increase the density of air guide points, has a flexible structure, is applied to an autoclave packaging bag, improves the air guide conditions in the vacuum bag, and can be applied to composite parts with different structural profiles.

Description

Technical Field

[0001] The invention relates to an air guiding device in bag making by autoclave curing process and application thereof in autoclave packaging bags. Background Art

[0002] During the autoclave curing process of aviation composite products, the production of packaging bags is one of the important factors affecting the curing process. However, the air-conducting component used in the existing bag making, the breathable felt, will have a false vacuum leak due to its poor air conduction, resulting in unnecessary quality costs. This problem is particularly evident under high temperature and high pressure curing conditions. Under high temperature and high pressure conditions, the breathable felt is compressed by the high pressure, the volume decreases, the density increases, and the air permeability between the breathable felts will be greatly reduced. Under the influence of high temperature, the air pressure in the bag increases, and the vacuum value at the vacuum measurement end in the bag will increase, that is, a false vacuum leak occurs. Summary of the invention

[0003] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide an air guide chain to improve the air guide effect inside the vacuum bag during the bag making process of autoclave curing; another purpose of the present invention is to provide an autoclave packaging bag with such an air guide chain.

[0004] Technical solution: An air guide chain, including unit chain links and connecting parts; the unit chain link is a geometric body, having a bottom surface that can be placed stably, and having a front profile and a rear profile above the bottom surface; a first air channel is opened in the geometric body between the front profile and the rear profile, the first air channel forms a first air hole A on the front profile and a first air hole B on the rear profile; a second air channel is opened between two intervals of points on the rear profile except the first air hole B in the geometric body, the second air channel forms a second air hole A and a second air hole B on the rear profile; at least two unit chain links are connected in series in sequence with a connecting part passing through the first air channel, and the first air channels of adjacent unit chain links are butted front and back and annularly sealed to form an air guide chain.

[0005] Furthermore, the bottom surface is a plane, which enables the unit chain links and the air guide chain to be placed stably.

[0006] Furthermore, the front profile and the rear profile are form-fitting profiles, and the rear profile of the front unit chain link fits with the front profile of the rear unit chain link to form a first airway annular seal between adjacent unit chain links. The form-fitting profile can make the joint fit together, without gaps, without air leakage, and without generating gaps between unit chain links.

[0007] In the best case, the front profile and the rear profile are respectively a concave arc surface and a convex arc surface with the same curvature. The arc surface fits better in the annular sealing effect, and is more convenient to operate when assembling to form an air guide chain.

[0008] Optimally, the first air hole A and the first air hole B have the same aperture, and the air flow efficiency can be further improved when the first air channels are connected.

[0009] Furthermore, the first air channel and the second air channel intersect within the geometric body or intersect in space.

[0010] Furthermore, the connecting piece is a belt-shaped object.

[0011] A hot-press packaging bag with the above-mentioned air guide chain comprises an air guide chain, an air-permeable felt, and a vacuum bag with a vacuum nozzle. A composite part is laid on the working surface of a molding tool, the air guide chain is arranged on the molding tool around the periphery of the composite part, the air-permeable felt covers the air guide chain and the composite part, the vacuum bag cover is arranged on the air-permeable felt and is annularly sealed with the working surface, and the vacuum nozzle is located above the upper surface of the air-permeable felt.

[0012] Further, the vacuum nozzle is located above the upper surface of the air-permeable felt above the air guide chain.

[0013] Beneficial effects: Compared with the prior art, the advantages of the present invention are: the air guide chain can increase the density of air guide points, form air flow channels in multiple directions, the length can be selected according to needs, and the structure is flexible by adjusting the number of unit chain links; the autoclave packaging bag with the air guide chain increases the density of air guide points in the vacuum bag, improves the air guide conditions in the vacuum bag, and can solve the problem of false vacuum leakage caused by poor air guide when only breathable felt is used for air guide. The application of the air guide chain can be applicable to composite parts with different structural surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the three-dimensional structure of the gas guide chain;

[0015] Figure 2 Schematic diagram of the three-dimensional structure of a unit chain link;

[0016] Figure 3 It is the front view of the unit chain link;

[0017] Figure 4 for Figure 3 Left view of;

[0018] Figure 5 for Figure 3 Bottom view of

[0019] Figure 6 It is a schematic diagram of the main structure of the packaging bag;

[0020] Figure 7 It is a schematic diagram of the longitudinal section of the packaging bag. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. These embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0022] A gas chain, such as Figure 1 As shown, it includes at least two unit links 1 and a connecting piece 2.

[0023] Unit link 1, as attached Figures 2 to 5 As shown, it is a geometric body having a bottom surface 11, which should enable the unit chain links to be placed stably, and is preferably a plane. A front profile 12 and a rear profile 13 are provided in the vertical direction above the bottom surface 11. A first air channel 14 is opened between the front profile 12 and the rear profile 13 inside the geometric body. The first air channel 14 forms a first air hole A141 on the front profile 12 and a first air hole B142 on the rear profile 13. A second air channel 15 is opened between two interval points on the rear profile 13 other than the first air hole B142 inside the geometric body. The second air channel 15 forms a second air hole A151 and a second air hole B152 on the rear profile 13. The first air channel 14 and the second air channel 15 may be intersecting and connected inside the geometric body, or may be spatially intersecting and non-connected.

[0024] The material of the unit chain link 1 can be steel, aluminum, nylon or other heat-resistant and pressure-resistant materials.

[0025] The connecting member 2 is a belt-shaped object, which can be a rigid member, such as a plastic rod, a wooden stick, etc., or a flexible member, such as a soft rope, a soft belt, etc.

[0026] When forming an air guide chain, at least two unit chain links 1 are arranged one by one, and the connecting piece 2 is inserted into the first air channel 14, so that each unit chain link 1 is connected in series in sequence, and the first air channels 14 of adjacent unit chain links 1 are butted front and back and annularly sealed, that is, when the airflow enters the first air channel of the next unit chain link from the first air channel of the previous unit chain link, there is no air leakage at the butt joint. For this reason, the front profile 12 and the rear profile 13 are designed to be shape-fitting profiles, and the rear profile of the previous unit chain link fits the front profile of the next unit chain link, forming annular sealing when the first air channels of adjacent unit chain links are butted front and back. The front surface 12 and the rear surface 13 can be fitted in a flat surface or in a curved surface. The shape-fitting surfaces can make the joints fit together without gaps, without air leakage, and without generating gaps between the unit chain links. Preferably, the front surface 12 is a concave arc surface and the rear surface 13 is a convex arc surface, and the curvatures of the two are the same. Compared with the flat surface fitting, the arc surface fitting has a better annular sealing effect, and is easier to operate when assembling to form an air guide chain. Under this premise, the first air hole A141 and the first air hole B142 can also be designed to have the same aperture to further improve the air flow efficiency.

[0027] After the air guide chain is assembled, the continuous first air channel forms an air flow channel in one direction, and the second air channel on each unit link forms an air flow channel in another direction. Preferably, the intersection angle between the first air channel and the second air channel is 90°. The length of the air guide chain can be selected as needed, and the structure is flexible by adjusting the number of unit links. It can be seen that the air guide chain can increase the density of air guide points.

[0028] A hot-pressed packaging bag with the above-mentioned air guide chain, as shown in the attached Figures 6-7 As shown, it includes an air guide chain 3, an air-permeable felt 4, and a vacuum bag 6 with a vacuum nozzle 5. A composite part 8 is laid on the working surface of a molding tool 7. The air guide chain 3 is arranged around the outer peripheral edge of the composite part 8. The air guide chain is placed on the molding tool through the bottom surface of the unit chain link. The air-permeable felt 4 is above the air guide chain 3 and the composite part 8, covering the air guide chain 3 and the composite part 8 completely. The vacuum bag 6 is covered on the air-permeable felt 4 and is circumferentially sealed with a sealing tape 9 to cover the air guide chain 3, the air-permeable felt 4, and the composite part 8 completely. The vacuum nozzle 5 is located above the upper surface of the air-permeable felt 4 above the air guide chain 3. When vacuuming, the vacuum nozzle contacts the upper surface of the air-permeable felt.

[0029] Under the action of the air guide chain, the packaging bag increases the density of air guide points in the vacuum bag, improves the air guide conditions in the vacuum bag, and can solve the problem of false vacuum leakage caused by poor air guide when only breathable felt is used for air guide. The application of the air guide chain can be applied to composite parts with different structural surfaces and can be reused under high and low temperature cycle conditions.

Claims

1. An air guide chain, characterized in that: The invention comprises a unit chain link (1) and a connecting member (2); the unit chain link (1) is a geometric body having a bottom surface (11) capable of being placed stably, a front profile surface (12) and a rear profile surface (13) above the bottom surface (11), a first air channel (14) being provided between the front profile surface (12) and the rear profile surface (13), the first air channel (14) forming a first air hole A (141) on the front profile surface (12) and a first air hole B (142) on the rear profile surface (13), and a first air hole A (141) being provided between two interval points on the rear profile surface (13) other than the first air hole B (142) on the geometric body. a second air channel (15), wherein the second air channel (15) forms a second air hole A (151) and a second air hole B (152) on the rear profile (13); the front profile (12) and the rear profile (13) are profiles with matching shapes, and the rear profile (13) of the previous unit chain link (1) is matched with the front profile (12) of the next unit chain link (1) to form an annular seal of the first air channel (14) of the adjacent unit chain links (1); the front profile (12) and the rear profile (13) are respectively a concave arc surface and a convex arc surface with the same curvature; the first air channel (14) and the second air channel (15) intersect in a geometric body or intersect in space; At least two unit chain links (1) are connected in series in sequence by means of a connecting piece (2) passing through a first air passage (14); the first air passages (14) of adjacent unit chain links (1) are butted front to back and annularly sealed to form an air guide chain.

2. The gas guide chain according to claim 1, characterized in that: The bottom surface (11) is a plane.

3. The gas guide chain according to claim 1, characterized in that: The first pore A (141) and the first pore B (142) have the same aperture.

4. The gas guide chain according to claim 1, characterized in that: The connecting piece (2) is a belt-shaped object.

5. An autoclave packaging bag having the air guide chain according to any one of claims 1 to 4, characterized in that: The invention comprises an air guide chain (3), an air permeable felt (4), and a vacuum bag (6) having a vacuum nozzle (5); a composite part is laid on a working surface of a molding tool; the air guide chain (3) is arranged on the molding tool around the periphery of the composite part; the air permeable felt (4) covers the air guide chain (3) and the composite part; the vacuum bag (6) is covered on the air permeable felt (4) and is annularly sealed with the working surface; and the vacuum nozzle (5) is located above the upper surface of the air permeable felt (4).

6. The autoclave packaging bag according to claim 5, characterized in that: The vacuum nozzle (5) is located above the upper surface of the air-permeable felt (4) above the air-guiding chain (3).

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