Filtering structure for air bag inflation ejection of safety air bag and air generator

Abstract

The invention discloses a filtering structure for air bag inflation ejection of a safety air bag and an air generator, and relates to the field of mechanical design and fluid mechanics. Comprising a net-shaped component and an air hole-shaped component, the net-shaped component is in a plane rectangular shape, the shape of the air hole-shaped component is matched with that of the net-shaped component, and the net-shaped component is connected to the end of the net-shaped component to form a strip-shaped component in a combined mode; the strip-shaped component is wound and fixed according to a preset diameter to form a filtering structure with multiple filtering layers, the net-shaped component is wound into at least one layer, the air hole-shaped component is wound into at least two layers, and the air hole-shaped component is arranged outside the net-shaped component. Explosion energy of high-pressure air can be dispersed into a large space range, direct destructive power of the explosion energy is reduced, and the service life of the structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical fields of mechanical design and fluid mechanics, in particular to a filter structure and a gas generator for inflating and ejecting a safety airbag. Background Art

[0002] The airbag system is an important part of the passive safety system of modern cars, designed to protect passengers from or reduce injuries in collision accidents. The principle is to fill a flexible rubber capsule with compressed air and use the compressibility of air to provide a cushioning effect. When the vehicle encounters a collision, the sensor detects the impact force and triggers the rapid inflation mechanism of the airbag. The airbag expands rapidly, forming a gas-filled protective layer between the primary collision (between the vehicle and the obstacle) and the secondary collision (between the occupants and the internal structure of the vehicle) to absorb the collision energy and mitigate the impact on the passengers.

[0003] The inflation process of airbags is usually driven by a chemical reaction, which instantly produces a large amount of gas to expand the airbag. In order to ensure that the airbag can be deployed quickly and safely, solid propellants (such as ammonium nitrate, guanidine nitrate, etc.) are usually used. These propellants will produce violent but controlled combustion after being ignited by an electric ignition device, generating harmless gases such as nitrogen, thereby quickly filling the airbag. However, during this process, fine drug powder residues will also enter the airbag along with the generated gas.

[0004] Because traditional filters have fixed and relatively large pore sizes, they can only block particles above a certain size and cannot effectively intercept finer pharmaceutical powders. This may not only cause a layer of powder to cover the surface of the airbag, affecting its elasticity and touch, but may also interfere with the normal operation of the airbag in some cases, reducing its protective effectiveness. In addition, residual chemicals may cause respiratory discomfort or other health problems.

[0005] To solve this problem, engineers are exploring options for improving filtration technology and materials, such as developing a multi-stage filtration system or using nano-level filter materials to improve filtration efficiency and reduce the possibility of harmful particles entering the airbag, while ensuring that the airbag can complete the inflation action in a very short time without affecting its key safety functions. These improvements will help improve the overall performance and reliability of the airbag system and further enhance passenger safety. Summary of the invention

[0006] Purpose of the invention: Based on the problems mentioned in the background technology, a filter structure and a gas generator for airbag inflation and ejection are proposed.

[0007] Technical solution: A filter structure for airbag inflation and ejection, including:

[0008] A mesh member, wherein the mesh member is in a planar rectangular shape, has a width W1≤36 mm, and a maximum thickness ≤1 mm;

[0009] A porous component, whose shape is adapted to the mesh component and has pores distributed on its surface; the mesh component is connected to the end of the mesh component to form a strip component; the strip component is rolled up and fixed at a preset diameter to form a filter structure with multiple filter layers; the innermost circle diameter of the filter structure is ≥10mm, and the outermost circle diameter is ≤70mm; the mesh component is rolled up into at least one layer; the porous component is rolled up into at least two layers; the porous component is arranged outside the mesh component.

[0010] In a further embodiment, the number of layers of the mesh member rolled up is 1, its width is 15 mm, and its minimum inner diameter is 10 mm;

[0011] The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 17 mm.

[0012] In a further embodiment, the number of layers of the mesh member rolled up is 3, its width is 27.5 mm, and its minimum inner diameter is 46.5 mm;

[0013] The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 52 mm.

[0014] In a further embodiment, the number of layers of the mesh member rolled up is 5, its width is 26.5 mm, and its minimum inner diameter is 58 mm;

[0015] The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 67 mm.

[0016] In a further embodiment, the mesh area of ​​the mesh component is smaller than the pore area of ​​the porous component, the unit number of meshes of the mesh component is higher than the unit number of pores of the porous component; and the hardness of the mesh component is lower than that of the porous component.

[0017] In a further embodiment, the mesh member comprises:

[0018] Vertices, numerous vertices are linearly and evenly distributed at preset intervals;

[0019] The edges have two ends connected to the apex; the edges are thick at both ends and thin in the middle; the angle between the straight line where the edges are located and the straight line where the apex is located is 30° to 60°.

[0020] In a further embodiment, the mesh member includes at least a first grid and a second grid; the first grid and the second grid are alternately distributed.

[0021] In a further embodiment, the first grille includes at least 4 rows of first air holes; a smooth mounting portion not less than 5 mm is provided on both upper and lower sides of the first grille;

[0022] In the horizontal direction, a first diffusion protrusion is arranged between the first air holes in each row; the spacing between the first air holes in each row is 1.5 mm to 2 mm; the aperture of the first air holes is between 1 mm and 2 mm; the distance between the first diffusion protrusions in each row is between 1.5 mm and 2 mm;

[0023] Wherein, along the vertical direction, the first air holes and the first diffusion protrusions are arranged alternately, and the spacing between them is 2mm to 3mm;

[0024] The second grid includes at least five rows of second air holes and second diffusion protrusions distributed between the second air holes.

[0025] In a further embodiment, the protruding direction of the diffusion protrusion is toward the outer ring, and the height of the diffusion protrusion is not less than 1.5 mm; the back side of the diffusion protrusion is concave.

[0026] In a further embodiment, the mesh member comprises at least an inner layer formed by rolling up a first grid and an outer layer formed by rolling up a second grid; the first diffusion protrusion abuts against an inner smooth curved surface of the outer layer.

[0027] A gas generator comprises a generator housing and also comprises any one of the above-mentioned filter structures for airbag inflation and ejection, wherein the filter structure is used to be assembled in the generator housing; the interior of the filter structure is also used to place pills to be ignited.

[0028] Beneficial effects:

[0029] 1. The present invention disperses the explosion energy of high-pressure air into a larger space through a mesh component, reduces its direct destructive power, and performs effective filtration for the first time;

[0030] At the same time, the mesh component has a lower hardness than the pore-shaped component, which can reduce the impact of high-pressure gas and extend the use effect and time of the filtering structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the expanded structure of the filtering structure of the present invention.

[0032] Figure 2 It is a schematic diagram of a filtering structure of the present invention.

[0033] Figure 3 It is a schematic diagram of the local structure of the mesh component of the present invention.

[0034] Figure 4 It is a schematic diagram of another filtration structure of the present invention.

[0035] The markings in the figure are: mesh component 1, pore-like component 2, vertex 3, edge 4, first grid 5, second grid 6, first pore 7, first diffusion protrusion 8, second pore 9, second diffusion protrusion 10. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Embodiment 1

[0038] Based on the problems mentioned in the background technology, the present application proposes an air filtering structure for local air instantaneous explosion, such as Figure 1 As shown, it mainly includes a mesh component 1 and a porous component 2. The width W1 of the mesh component 1 is ≤35mm, and the maximum thickness is ≤1mm. The mesh component 1 is welded with the mesh component 1. The mesh component 1 is a plane rectangular shape. The shape of the porous component 2 is compatible with the mesh component 1, and can also be a plane rectangular shape. A new strip component is formed by welding. The strip component is rolled up and fixed with a preset diameter to form a filter structure with multiple filter layers. The innermost circle diameter of the filter structure is ≥30mm, and the outermost circle diameter is ≤35mm. Among them, the mesh component 1 is rolled up into at least 1 layer, and the porous component 2 is rolled up into at least 2 layers. The continuous rolling is at least 3 layers. Then in actual use, the air explodes instantly inside the rolled annular filter structure, and the air passes through the rolled multi-layer curved surface inside to be quickly filtered and quickly overflow outward. In this process, the above structure is used to achieve effective filtration of particulate matter.

[0039] In the present embodiment, the mesh-like member 1 has a lower hardness than the porous member 2 .

[0040] In this embodiment, the maximum number of filter layers of the filter structure is 5, such as the mesh component 1 is rolled into at least 3 layers, and the porous component 2 is rolled into at least 2 layers. The first wave of rapid filtration is performed through the mesh component 1, and the porous component 2 performs filtration again.

[0041] In the design, the mesh area of ​​the mesh member 1 is smaller than the pore area of ​​the pore member 2, and the unit number of the mesh of the mesh member 1 is higher than the unit number of the pores of the pore member 2. In this embodiment, the purpose of the mesh member 1 is to filter quickly and reduce the resistance to air as much as possible, so a high-density mesh structure is selected. Then in this solution, the service life of the filtering structure can be extended.

[0042] At the same time, the air explodes instantaneously. The present application optimizes the mesh member 1 so that it can divert the air after the explosion, aiming at controlling the explosion shock wave and reducing its destructive effect. The specific optimization scheme is that the mesh member 1 includes: vertices 3 and edges 4 alternately connected to the vertices 3, that is, countless vertices 3 are linearly and evenly distributed at a preset spacing, and the two ends of the edge 4 are respectively connected to the vertices 3. The edge 4 is a structure with thick ends and thin in the middle. The angle between the straight line where the edge 4 is located and the straight line where the vertex 3 is located is 30° to 60°. Through the above design, when the explosion occurs, the high-temperature and high-pressure air generated by the explosion expands rapidly, trying to find the path with the least resistance to diffuse outward. The role of the mesh structure is to provide multiple dispersed outlets for these air, thereby effectively dispersing the explosion energy into a larger spatial range, reducing the pressure peak in a single direction, and then reducing direct damage. The thickness of the vertex 3 is higher than the thickness of the edge 4, and a convex structure is formed relatively, which further enhances the above effect.

[0043] The mesh member 1 in this embodiment at least comprises a first grid 5 and a second grid 6, and the first grid 5 and the second grid 6 are continuously distributed, such as the grid layout in the technology of the reference patent application number CN202420218561.8.

[0044] Different from the existing technical solutions, Figure 1 As shown, there is no obvious gap between the first grille 5 and the second grille 6. The first grille 5 includes at least 4 rows of first air holes 7, and first diffusion protrusions 8 arranged between the first air holes 7 and the first air holes 7 in each row in the horizontal direction. In the vertical direction, the first air holes 7 and the first diffusion protrusions 8 are arranged alternately. A smooth mounting portion of not less than 5 mm is arranged on the upper and lower sides of the first grille. The spacing between the first air holes 7 and the first air holes 7 in each row is 1.5 mm to 2 mm; the aperture of the first air holes 7 is between 1 mm and 2 mm. The distance between the first diffusion protrusions 8 in each row is between 1.5 mm and 2 mm. The spacing between the first air holes 7 and the first diffusion protrusions 8 is 2 mm to 3 mm.

[0045] The second grid 6 includes at least 5 rows of second air holes 9 and second diffusion protrusions 10 distributed between the second air holes 9. When rolling up, the first grid 5 is located in the inner layer, and the second grid 5 is located in the outer layer. The first diffusion protrusion 8 is against the inner surface of the second grid 6, and there is always a gap between the first grid 5 and the second grid 6, and the height of the gap is the thickness of the first diffusion protrusion 8. The height of the diffusion protrusion is not less than 1.5 mm.

[0046] In this embodiment, the protruding direction of the diffusion protrusion is toward the outer ring, and the back side of the diffusion protrusion is concave.

[0047] Working principle: local explosion, air expands instantaneously inside the filter structure, high-pressure air carries various particles, passes through the mesh component 1 and rolls up to form the first filter layer, first filtering large particles, while the mesh component 1 disperses the explosion energy of the high-pressure air into a larger space, reducing its direct destructive power, and the high-pressure air passes through the porous component 2 for filtering again.

[0048] Embodiment 2

[0049] In this embodiment, the number of layers of the mesh component 1 rolled up is 1, its width is 15 mm, and its minimum inner diameter is 10 mm. The number of layers of the porous component 2 rolled up is 2, and its width is adapted to the width of the mesh component 1. After rolling up, its maximum outer diameter is 17 mm. The porous component 2 is wrapped around the outer side 1 of the mesh component to form the first type of filtering structure.

[0050] The filter structure parameters of this embodiment are determined after passing the requirements of at least three test parameters such as air permeability, pressure, and flame, and the test parameters meet the requirements of the industry standard, which is GB20075-2006 "Performance requirements and test methods for front and side protection devices for automobile occupants".

[0051] Embodiment 3

[0052] In this embodiment, the number of layers of the porous component 1 rolled up is 2, its width is 27.5 mm, and its minimum inner diameter is 46.5 mm. The number of layers of the mesh component 2 rolled up is 3, and its width is adapted to the width of the mesh component 1. After rolling up, its maximum outer diameter is 52 mm. The porous component 2 is wrapped around the outer side 1 of the mesh component to form a second type of filtering structure.

[0053] The filter structure parameters of this embodiment are determined after passing the requirements of at least three test parameters such as air permeability, pressure, and flame, and the test parameters meet the requirements of the industry standard, which is GB20075-2006 "Performance requirements and test methods for front and side protection devices for automobile occupants".

[0054] Embodiment 4

[0055] In this embodiment, the number of layers of the porous component 1 rolled up is 2, its width is 26.5 mm, and its minimum inner diameter is 58 mm. The number of layers of the mesh component 2 rolled up is 5, and its width is adapted to the width of the mesh component 1. After rolling up, its maximum outer diameter is 67 mm. The porous component 2 is wrapped on the outer side 1 of the mesh component to form a third type of filtering structure.

[0056] The filter structure parameters of this embodiment are determined after passing the requirements of at least three test parameters such as air permeability, pressure, and flame, and the test parameters meet the requirements of the industry standard, which is GB20075-2006 "Performance requirements and test methods for front and side protection devices for automobile occupants".

[0057] Embodiment 5

[0058] The present embodiment is a generator for automobile airbag ejection, a generator shell, and a filter structure for airbag inflation ejection proposed in Example 1. The filter structure is used to be assembled in the generator shell. The interior of the filter structure is used to place ignitable tablets. The gas in the space formed by the filter structure and the generator shell is rapidly expanded by igniting the medicine. Most of the medicine residue is filtered through the filter structure, passes through the generator shell through a preset pipeline, and reaches the airbag.

[0059] This embodiment can specifically assemble the parameter settings of three models of Embodiment 2, Embodiment 3, and Embodiment 4.

[0060] Based on this, this embodiment provides a detailed structure for explanation: the number of the filtering structure is at least 1, and it also includes a bearing seat, a columnar member, an inner top cover, and an outer top cover;

[0061] The bearing seat is provided with a stepped circular groove, which is at least a two-step structure. The area where the stepped circular groove has the smallest diameter is used to place the filtering structure. A through hole is provided at the bottom of the circular groove for installing a cylindrical member. The cylindrical structure is hollow and its diameter is smaller than the inner diameter of the filtering structure. A plurality of air holes are provided on the side of the cylindrical structure. The cylindrical structure serves as an ignition structure. The edge of the inner top cover is bent to form a matching portion. The inner top cover is pressed against the top of the cylindrical member. The matching portion is located inside the filtering structure and is pressed against the surface of the mesh member after winding. The outer top cover is fixedly assembled with the bearing seat. The outer top cover is provided with a second groove, and the shape of the second groove is adapted to the stepped circular groove. At least one mounting hole is provided on the top of the outer top cover for installing a gas guide assembly. The gas guide assembly presses against the inner top cover. Then, when in use, the tablets are scattered in the annular space formed by the cylindrical structure and the filtering structure, and are ignited. The gas in the generator expands instantly. The gas passes through the filtering structure and reaches the annular interval formed by the outer side of the filtering structure and the generator, and is ejected through the gas guide assembly.

[0062] Based on this, compared with Figure 1 In actual use, the filter structure is not compatible with the stepped circular groove installation, so it is proposed as follows Figure 4 The structure is characterized in that the positions of the first grille and the second grille are swapped and assembled through the smooth mounting portion.

[0063] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A filter structure for airbag inflation and ejection, characterized in that: include: A mesh member, wherein the mesh member is in a planar rectangular shape and has a width W1≤40 mm; A porous component, whose shape is adapted to the mesh component and has pores distributed on its surface; the mesh component is connected to the end of the mesh component to form a strip component; the strip component is rolled up and fixed at a preset diameter to form a filtering structure with multiple filtering layers; the innermost circle diameter of the filtering structure is ≥10mm, and the outermost circle diameter is ≤70mm; the mesh component is rolled up into at least one layer; the porous component is rolled up into at least two layers; the porous component is arranged outside the mesh component.

2. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The number of layers of the mesh member rolled up is 1, its width is 15 mm, and its minimum inner diameter is 10 mm; The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 17 mm.

3. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The number of layers of the mesh member rolled up is 3, its width is 27.5 mm, and its minimum inner diameter is 46.5 mm; The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 52 mm.

4. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The number of layers of the mesh member rolled up is 5, its width is 26.5 mm, and its minimum inner diameter is 58 mm; The number of layers of the pore-shaped component rolled up is 2, and the maximum outer diameter thereof is 67 mm.

5. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The mesh area of ​​the mesh component is smaller than the pore area of ​​the porous component, the unit number of meshes of the mesh component is higher than the unit number of pores of the porous component; and the hardness of the mesh component is lower than that of the porous component.

6. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The mesh member comprises: Vertices, numerous vertices are linearly and evenly distributed at preset intervals; The edges have two ends connected to the apex; the edges are thick at both ends and thin in the middle; the angle between the straight line where the edges are located and the straight line where the apex is located is 30° to 60°.

7. The filter structure for airbag inflation and ejection according to claim 1, characterized in that: The mesh member comprises at least a first grid and a second grid; the first grid and the second grid are alternately distributed.

8. The filter structure for airbag inflation and ejection according to claim 7, characterized in that: The first grille includes at least four rows of first air holes; a smooth mounting portion having a thickness of not less than 5 mm is provided on both upper and lower sides of the first grille; In the horizontal direction, a first diffusion protrusion is arranged between the first air holes in each row; the spacing between the first air holes in each row is 1.5 mm to 2 mm; the aperture of the first air holes is between 1 mm and 2 mm; the distance between the first diffusion protrusions in each row is between 1.5 mm and 2 mm; Wherein, along the vertical direction, the first air holes and the first diffusion protrusions are arranged alternately, and the spacing between them is 2mm to 3mm; The second grid includes at least five rows of second air holes and second diffusion protrusions distributed between the second air holes.

9. The filter structure for airbag inflation and ejection as claimed in claim 5, characterized in that: The protruding direction of the diffusion protrusion is toward the outer ring, and the height of the diffusion protrusion is not less than 1.5 mm; the back side of the diffusion protrusion is concave.

10. The filter structure for airbag inflation and ejection according to claim 7, characterized in that: The mesh component at least comprises an inner layer formed by rolling up a first grid and an outer layer formed by rolling up a second grid; the first diffusion protrusion abuts against the inner smooth curved surface of the outer layer.

11. A gas generator, comprising a generator housing, characterized in that: It also includes the filter structure for airbag inflation and ejection as described in claims 1-9, wherein the filter structure is used to be assembled in the generator housing; the interior of the filter structure is also used to place the tablets to be ignited.

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