Air leakage prevention sealing structure and technology of inflatable air bag

Abstract

The invention discloses an air leakage prevention sealing structure and process of an inflatable air bag, and aims to solve the problem of air leakage caused by a micro gap in a step-shaped offset formed by lapping edge covering strips end to end, and innovatively add a flow guide piece and a fluid reflection mechanism in the air bag. The high-pressure sealing emulsion is ejected through the air nozzle, impacts the reflecting surface, then is directionally reflected to the offset part, and covers the opening gap of the inner layer. And the reflected sealing emulsion permeates into the offset gap under the action of pressure, and then sealing can be completed through hot-pressing shaping. According to the scheme, the mechanism is simple, the sealing reliability of the offset part can be remarkably improved, and the product service life is prolonged. The technological process of the sealing mechanism is easy to operate, and manpower can be saved.

Description

Technical field

[0001] The present invention relates to the field of inflatable airbag sealing, and in particular to an anti-leakage sealing structure and process for an inflatable airbag. [Background Technology]

[0002] In the field of inflatable equipment manufacturing, such as air mattresses, inflatable paddle boards, inflatable boats, etc., the edges of the airbag body are usually wrapped and sealed with edging strips. In traditional processes, the ends of the edging strips are bonded, hot-melt welded, or welded at high frequency to form a ring-shaped closed structure. This process has the following inherent defects: 1. The risk of air leakage at the discontinuity. The overlapping parts of the edging strips at the beginning and end will inevitably form a step-like discontinuity due to the superposition of thickness. This discontinuity causes an open gap between the inner edging strip and the outer edging strip, and the opening direction of the gap is toward the inside of the airbag. 2. The risk of stress concentration. When the airbag is inflated, the overlapping area is subjected to uneven stress, which may further expand the opening gap and cause air leakage.

[0003] Existing technical solutions for sealing gaps have significant shortcomings. Early approaches used surface coating, where operators manually applied nitrile rubber latex to the surface of the lap joint. However, the viscous sealing material adhered only to the outer surface of the gap structure and could not penetrate the gaps between layers, making unfilled areas prone to leakage. Later attempts were made to soak the entire edge strip in nitrile rubber latex, but this solution resulted in material waste and failed to ensure the latex would penetrate the gaps within the gap.

[0004] These technical bottlenecks directly lead to an imbalance between production costs and quality control. There is an urgent need for an innovative solution that can simultaneously achieve the directional delivery of sealing materials to the inside of the gap opening, is compatible with existing hemming equipment, and has controllable costs. [Summary of the invention]

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an anti-leakage sealing structure and process for an inflatable airbag. In order to solve the problem of air leakage caused by micro gaps inside the step-shaped gap formed by the overlapping of the end-to-end edging strip 2, a flow guide 4 and a fluid reflection mechanism are innovatively added inside the airbag body 1. After the high-pressure sealing emulsion is ejected through the air nozzle, it impacts the reflecting surface 41 and is reflected directionally to the gap, covering the inner layer opening gap. The reflected sealing emulsion penetrates into the gap under pressure, and the sealing can be completed by subsequent hot pressing and shaping. This solution has a simple structure and can significantly improve the sealing reliability of the gap and the service life of the product.

[0006] In order to solve the above technical problems, the present invention provides an air leakage-proof sealing structure for an inflatable airbag, comprising an airbag main body 1, the edge of which is covered by a edging strip 2 to form a sealed cavity 11; the edging strip 2 is overlapped end to end to form a step portion; an air nozzle is arranged on the edging strip 2 and can be connected to the interior of the sealed cavity 11; a flow guide 4 is located in the sealed cavity 11 and is arranged on the airbag main body 1 or the edging strip 2, and a reflecting surface 41 is on the fluid injection path of the air nozzle, and the angle between the reflecting surface 41 and the axis of the air nozzle is an acute angle or an obtuse angle, and the extension direction of the reflecting surface 41 is configured as follows: inside the sealed cavity 11, the high-pressure sealing emulsion sprayed from the air nozzle 3 can cover the step portion 21 after reflection.

[0007] In the above-mentioned anti-leakage sealing structure of the inflatable airbag, the flow guide 4 includes a fixed end 42 and a free extension end 43 , and the fixed end 42 is fixedly disposed on the edge strip 2 .

[0008] The air leakage-proof sealing structure of the inflatable airbag as described above further includes a fixing bracket provided on the airbag body 1 and connecting the airbag body 1 and the guide member 4 , wherein the fixing bracket is configured to constrain the guide member 4 at a set position and angle.

[0009] As described above, in the air bag's anti-leakage sealing structure, the fixed bracket is a restraining wire 12 fixed at both ends on the inner wall of the air bag body 1 , and the restraining wire 12 is configured for the free extension end 43 of the guide member 4 to abut against and restrain the displacement of the free extension end 43 .

[0010] In the above-mentioned anti-leakage sealing structure of the inflatable airbag, the abutting surface between the guide member 4 and the restraining wire 12 is provided with a resistance-increasing texture for enhancing the friction stability of the restraining wire 12 .

[0011] In the aforementioned anti-leakage sealing structure for an inflatable airbag, the fixed end 42 of the flow guide 4 is thicker than the free extending end 43 .

[0012] In the above-mentioned anti-leakage sealing structure of the inflatable airbag, an elastic support member is provided on the back of the flow guide member 4 , and the elastic support member is configured to increase the working inclination angle of the flow guide member 4 as the pressure of the high-pressure sealing emulsion increases.

[0013] In the aforementioned anti-leakage sealing structure for an inflatable airbag, the reflecting surface 41 is a curved surface.

[0014] In the aforementioned anti-leakage sealing structure of the inflatable airbag, the air nozzle 3 is arranged in the overlapping area of ​​the edge strip 2 and adjacent to the step portion 21 .

[0015] The present invention also provides an air leakage prevention and sealing process for an inflatable airbag, comprising any of the above-mentioned air leakage prevention and sealing structures for an inflatable airbag, comprising the steps of:

[0016] The guide member pre-installation step: before the edge strip 2 is closed, the free extension end 43 of the guide member 4 is straightened and extended into the airbag body 1;

[0017] Edge closing step: closing the edge strip 2 to form an annular sealing structure, and overlapping the edge strip 2 end to end to form a gap portion;

[0018] Inflation positioning step: Inflate the airbag with gas so that the free extension end 43 of the guide member 4 abuts against the constraint structure to form a reflection inclination angle;

[0019] High-pressure glue injection step: injecting sealing emulsion at high pressure through the air nozzle, and the emulsion impacts the reflective surface 41 of the guide member 4 and covers the discontinuity part;

[0020] Hot pressing and curing step: heating and pressurizing the gap part to make the sealing emulsion and the edge strip 2 fuse and cure.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. Reflecting surface 41, located on flow guide 4, precisely controls the angle of the reflector to direct the high-pressure sealing emulsion toward the inner opening at the discontinuity, precisely sealing the leak path from within the airbag. This simple application of the physical reflection principle overcomes the fundamental problem of traditional processes being unable to penetrate micro-gaps. Furthermore, the sealing emulsion reflected to the discontinuity carries kinetic energy, enabling it to better cover and penetrate the opening, significantly improving sealing reliability.

[0023] 2. The reflection mechanism focuses the sealing emulsion to cover the fault area, which reduces the amount of sealing emulsion used compared to the traditional injection process and can achieve quantitative control of the sealing emulsion.

[0024] 3. The structure of the guide 4 ensures a constant reflection angle, and combined with the mechanical limit of the restrained wire drawing 12, it maintains a precise reflection path under high-pressure impact.

[0025] 4. The airflow of the initial inflation is used to push the guide member 4 to the working position, which is simple to operate and saves labor costs.

[0026] 5. The air nozzle 3 is located in the overlapping area of ​​the edge strip 2, which can reduce the length of the reflection path, reduce the pressure required for the reflection sealing emulsion, and reduce the amount of sealing emulsion used.

Brief Description of the Drawings

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1A schematic diagram of the internal structure of an inflatable airbag with an air leakage-proof sealing structure;

[0029] Figure 2 for Figure 1 A partial enlarged view of position A;

[0030] Figure 3 A schematic diagram of an anti-leakage sealing structure for an inflatable airbag;

[0031] Figure 4 for Figure 3 Sectional view along the BB section line;

[0032] Figure 5 The present invention is a flow chart of the process steps of an air leakage-proof sealing process for an inflatable airbag. [Specific implementation method]

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] like Figures 1 to 4As shown, the present invention provides an airbag leak-proof sealing structure, comprising an airbag body 1, a edging strip 2, an air nozzle 3, and a flow guide 4. The edge of the airbag body 1 is covered by the edging strip 2 to form a sealed cavity 11, with the edging strip 2 overlapping end to end to form a stepped portion. The air nozzle is disposed through the edging strip 2 and is in communication with the interior of the sealed cavity 11. The flow guide 4 is located within the sealed cavity 11 and is disposed on the airbag body 1 or the edging strip 2. The flow guide 4 has a reflective surface 41 in the fluid ejection path of the air nozzle. The reflective surface 41 forms an acute or obtuse angle with the axis of the air nozzle. The reflective surface 41 extends in a direction configured to reflect the high-pressure sealing emulsion ejected from the air nozzle 3 within the sealed cavity 11, thereby covering the stepped portion. Specifically, the edge of the airbag body 1 is wrapped and sealed by the edging strip 2, and the tail end of the edging strip 2 overlaps to form a step-shaped discontinuity. The discontinuity produces an open gap in the inner layer due to the overlapping thickness of the edging strip 2, and the opening direction is toward the inside of the airbag, constituting a potential leakage point; the air nozzle is provided through the edging strip 2 and is connected to the inside of the airbag body 1 for injecting gas or sealing emulsion. In the key area between the air nozzle and the discontinuity, an innovative flow guide 4 structure is added. The flow guide 4 is made of a chemically resistant sheet material, such as PVC or rubber composite material, and its main body includes a reflective surface 41 for fluid guidance. The reflective surface 41 is located on the fluid injection path of the air nozzle, and the angle between the reflective surface 41 and the axis of the air nozzle is configured to be an acute angle or an obtuse angle. Its extension direction allows the high-pressure sealing emulsion to reflect after impact to form an adhesion area covering the discontinuity, thereby directionally sealing the opening gap in the inner layer. Preferably, the air nozzle 3 is located in the overlapping area of ​​the edge strip 2, adjacent to the discontinuity 21. This reduces the length of the reflection path, lowering the pressure required to reflect the sealing emulsion and reducing the amount of sealing emulsion used. This solves the fundamental problem of traditional processes' inability to penetrate microgaps solely through the principle of physical reflection. Furthermore, the sealing emulsion reflected to the discontinuity carries momentum, enabling it to better cover and penetrate the open gap, significantly improving sealing reliability. The reflection mechanism focuses the sealing emulsion to cover the discontinuity area, reducing the amount of sealing emulsion used compared to traditional injection processes and enabling quantitative control of the sealing emulsion.

[0035] like Figure 2As shown, in some embodiments of the present invention, the deflector 4 includes a fixed end 42 and a freely extending end 43. The fixed end 42 is fixed to the edging strip 2, while the other end extends freely. Specifically, the deflector 4 is designed to include a fixed end 42 and a freely extending end 43. The fixed end 42 is fixed to the edging strip 2 with a high-strength adhesive, specifically bonded beyond the front end of the air nozzle, while the freely extending end 43 extends freely within the airbag. Preferably, to further stabilize the position of the deflector 4 and precisely control its operating angle, the structure also includes a fixing bracket. The fixing bracket is disposed on the airbag body 1, connecting the airbag body 1 and the deflector 4. For example, the fixing bracket is a restraining wire 12 with both ends fixed to the inner wall of the airbag body 1. The restraining wire 12 is an elastic fiber thread arranged parallel to the inner wall of the airbag body 1, with its ends anchored to the upper and lower inner walls of the airbag body 1. The freely extending end 43 of the deflector 4 abuts against the restraining wire 12, mechanically restraining the deflector 4 to maintain the set reflection angle. The structure of the guide member 4 ensures a constant reflection angle, and combined with the mechanical limitation of the constrained wire drawing 12, it maintains a precise reflection path under high-pressure impact. Preferably, in order to improve the abutment stability, the contact surface between the free extension end 43 of the guide member 4 and the constrained wire drawing 12 is provided with a micro-raised resistance-increasing texture, such as a wavy or granular concave-convex structure, to prevent angular deviation under high-pressure impact by increasing the surface friction coefficient. Preferably, the physical parameters of the guide member 4 are optimized to adapt to the structure of the airbag body 1, and the width of the guide member 4 is set to be smaller than the thickness of the airbag body 1 to ensure that it can naturally droop inside the airbag in a straightened state without hindering the inflation airflow. Preferably, the thickness of the guide member 4 gradually decreases from the fixed end 42 to the free extension end 43, that is, the fixed end 42 is thicker to provide structural strength and better withstand bonding stress and impact loads; the free extension end 43 is thinner to reduce the overall weight. In addition, in some embodiments of the present invention, an elastic support member, such as a small spring or a rubber elastomer, may be provided on the back of the guide member 4. The elastic support member can be provided on the inner wall of the airbag body 1 or the edging strip 2, and is fixed relative to the airbag body 1. The elastically compressible part abuts against the guide member 4 and can undergo compression deformation, so that the inclination angle of the reflecting surface 41 of the guide member 4 can adaptively increase as the injection pressure of the sealing emulsion increases, thereby ensuring the dynamic accuracy of the reflection path.

[0036] The reflective surface 41 of the flow guide 4 must be configured to meet fluid dynamics requirements. In addition to a flat surface, the reflective surface 41 of the flow guide 4 of the present invention can also be a curved surface. The reflective surface 41 exhibits a continuous, inwardly concave arc along the nozzle axis, with its radius of curvature configured based on the required fluid coverage. This curved surface design focuses the sealing emulsion jet, increasing its coverage of the discontinuity.

[0037] The present invention also relates to a gas leakage-proof sealing process for an inflatable airbag, such as Figure 5As shown, the sealing process of the present invention is implemented in the following steps in sequence:

[0038] 1. Pre-positioning the deflector: Before closing the edge strip 2, adhere the fixed end 42 of the deflector 4 to the edge strip 2. Manually straighten the free end 43 of the deflector 4 and insert it into the airbag interior, assuming a naturally extended position. Pre-positioning the deflector 4 ensures that its length corresponds to the future location of the gap.

[0039] 2. Edge Closure Step: Align the ends of the edge strip 2 and overlap them. Heat-seal or high-frequency welding is used to join the overlapping areas, completing the annular seal of the edge strip 2. This closure creates a naturally stepped structure at the end-to-end overlap. This creates an open gap between the inner and outer edge strips 2, facing the interior of the airbag. This gap is a potential air leakage path.

[0040] 3. Inflation and Positioning Step: Gas is injected into the airbag through the nozzle, gradually inflating and deploying the airbag body 1. During the inflation process, the airflow pushes the free extension end 43 of the deflector 4 away from the nozzle until it abuts the surface of the restraining wire 12. At this point, the deflector 4 forms a stable reflection angle under mechanical constraint, with the reflective surface 41 precisely pointing toward the opening gap at the discontinuity. The drag-enhancing texture effectively prevents deflection of the deflector 4 during this process.

[0041] 4. High-pressure injection: A sealing emulsion, preferably nitrile rubber emulsion, is injected into the airbag body 1 as a high-pressure jet. After impacting the reflective surface 41, the high-speed jet forms a directional reflection flow based on the preset inclination angle or curved surface characteristics. Reflection from a flat surface results in a diffuse spray distribution, while reflection from a curved surface results in a concentrated spray distribution or a more diffuse distribution depending on the curvature. The reflected sealing emulsion, carrying kinetic energy, completely covers the inner openings of the discontinuity. The high pressure forces the emulsion to penetrate all potential leaks.

[0042] 5. Hot pressing and curing step: Apply uniform hot pressing to the outer surface of the gap. Preferably, a hot pressing process of 50-70 degrees is adopted. The appropriate temperature and pressure are used to promote the fusion of the sealing emulsion that has penetrated into the gap with the material of the edge strip 2 to form a permanent sealing structure.

[0043] In this process, the initial kinetic energy of the high-pressure sealing emulsion is reflected by the reflective surface 41 of the flow guide 4, converting it into penetrating pressure directed toward the step gap. This improves the sealing effect and significantly increases the airbag qualification rate. Furthermore, the initial inflation airflow is used to propel the flow guide 4 into the working position, simplifying operation and saving labor costs. Furthermore, the amount of sealing emulsion used can be quantitatively controlled, saving materials.

Claims

1. An airtight sealing structure for an inflatable airbag, characterized in that include: The airbag body (1) has an edge covered by a edging strip (2) to form a sealed cavity (11); the edging strip (2) is overlapped end to end to form a gap portion (21); An air nozzle (3) is provided on the edge strip (2) and is communicated with the interior of the sealing cavity (11); A flow guide (4) is located in the sealed cavity (11) and is provided on the airbag body (1) or the edge strip (2); The reflecting surface (41) is located on the fluid injection path of the air nozzle (3), the angle between the reflecting surface (41) and the axis of the air nozzle (3) is an acute angle or an obtuse angle, and the extending direction of the reflecting surface (41) is configured to reflect the high-pressure sealing emulsion ejected from the air nozzle (3) inside the sealing cavity (11) and cover the step portion (21).

2. The air bag sealing structure for preventing leakage of an inflatable airbag according to claim 1, characterized in that The flow guide (4) comprises a fixed end (42) and a free extension end (43), and the fixed end (42) is fixedly arranged on the edge strip (2).

3. The air leakage-proof sealing structure of an inflatable airbag according to claim 2, characterized in that It also includes a fixing bracket arranged on the airbag body (1) and connecting the airbag body (1) and the flow guide (4), wherein the fixing bracket is configured to constrain the flow guide (4) at a set position and angle.

4. The air-leakage-proof sealing structure of an inflatable airbag according to claim 3, characterized in that The fixing bracket is a restraining wire (12) with both ends fixed on the inner wall of the airbag body (1), and the restraining wire (12) is configured to allow the free extension end (43) of the guide member (4) to abut against and restrain the displacement of the free extension end (43).

5. The air leakage-proof sealing structure of an inflatable airbag according to claim 4, characterized in that The abutting surface between the flow guide (4) and the restraining wire drawing (12) is provided with a resistance-increasing texture for enhancing the friction stability of the restraining wire drawing (12).

6. The air leakage-proof sealing structure of an inflatable airbag according to claim 2, characterized in that The fixed end (42) of the flow guide (4) has a thickness greater than that of the free extending end (43).

7. The air leakage-proof sealing structure of an inflatable airbag according to claim 2, characterized in that An elastic support member is provided on the back of the flow guide member (4), and the elastic support member is configured to increase the working inclination angle of the flow guide member (4) as the pressure of the high-pressure sealing emulsion increases.

8. The air leakage-proof sealing structure of an inflatable airbag according to claim 1, characterized in that The reflecting surface (41) is a curved surface.

9. The air-leakage-proof sealing structure of an inflatable airbag according to claim 1, wherein The air nozzle (3) is arranged in the overlapping area of ​​the edge strip (2) and is adjacent to the step portion (21).

10. A process for preventing air leakage of an inflatable airbag, comprising the anti-air leakage sealing structure of an inflatable airbag according to any one of claims 1 to 9, characterized in that The following steps are involved: The guide member pre-installation step: before the edge strip (2) is closed, the fixed end (42) of the guide member (4) is bonded and fixed to the edge strip (2), and the free extension end (43) of the guide member (4) is straightened and extended into the airbag body (1); Edge closing step: closing the edge strip (2) to form an annular sealing structure, and overlapping the edge strip (2) end to end to form a gap portion (21); Inflation positioning step: filling the air bag with gas so that the free extension end (43) of the guide member (4) abuts against the constraint structure to form a reflection inclination angle; High-pressure glue injection step: injecting sealing emulsion at high pressure through the air nozzle (3), the emulsion impacting the reflective surface (41) of the guide member (4) and then covering the discontinuity portion (21); Hot pressing and curing step: heating and pressurizing the gap portion (21) to fuse and cure the sealing emulsion and the edge strip (2).

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