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

Abstract

The utility model 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 in 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 utility model relates to mechanical design, fluid mechanics technical field especially is air bag of safety air bag inflation pops out with filter structure and gas generator. BACKGROUND

[0002] Airbag system is an important part of modern automobile passive safety system, aiming at protecting passengers from or reducing injuries in collision accidents. Its principle is to fill compressed air into a flexible rubber capsule, using 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 rapidly expands to form a gas-filled protective layer between the first collision (between the car and the obstacle) and the second collision (between the car occupants and the car interior structure), to absorb the collision energy and mitigate the impact on the passengers.

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

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

[0005] To solve this problem, engineers are exploring improved filtration technology and material selection, such as developing a multi-stage filtration system or using nanoscale filter materials, to improve filtration efficiency and reduce the likelihood 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 help to improve the overall performance and reliability of the airbag system, further enhancing the safety of passengers. UTILITY MODEL CONTENT

[0006] The utility model aims to solve the problems mentioned in the background technology and proposes an airbag inflation pop-out filter structure and gas generator.

[0007] Technical solution: The airbag inflation pop-out filter structure comprises:

[0008] a mesh member, which is a planar rectangle, with a width W1≤36mm, and a maximum thickness ≤1mm;

[0009] a porous member, which is shaped to fit the mesh member, and has pores distributed on its surface; the mesh member is connected to the end of the mesh member to form a strip member; the strip member is rolled and fixed with a preset diameter to form a filter structure with multiple filter layers; the innermost circle of the filter structure has a diameter ≥10mm, and the outermost circle has a diameter ≤70mm; the mesh member is rolled into at least 1 layer; the porous member is rolled into at least 2 layers; the porous member is arranged outside the mesh member.

[0010] In a further embodiment, the mesh member is rolled into 1 layer, has a width of 15mm, and a minimum inner diameter of 10mm;

[0011] The porous member is rolled into 2 layers, and has a maximum outer diameter of 17mm.

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

[0013] The porous member is rolled into 2 layers, and has a maximum outer diameter of 52mm.

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

[0015] The porous member is rolled into 2 layers, and has a maximum outer diameter of 67mm.

[0016] In a further embodiment, the mesh member has a mesh area smaller than the pore area of the porous member, and a unit quantity of mesh higher than that of the pores of the porous member; the mesh member has a hardness lower than that of the porous member.

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

[0018] a vertex, a plurality of the vertices being linearly and uniformly distributed at a preset interval;

[0019] a ridge, which is connected to the vertex at both ends; the ridge has a structure with thick ends and a thin middle; the straight line on which the ridge is located and the straight line on which the vertex is located form an angle of 30° to 60°.

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

[0021] In further embodiments, the first grid comprises at least 4 rows of first air holes; the upper and lower sides of the first grid are each provided with a smooth mounting portion of no less than 5 mm;

[0022] In the horizontal direction, the first air holes in each row are provided with first diffusion protrusions therebetween; the distance between the first air holes in each row is 1.5-2 mm; the aperture of the first air holes is 1-2 mm; the distance between the first diffusion protrusions in each row is 1.5-2 mm;

[0023] In the vertical direction, the first air holes and the first diffusion protrusions are alternately arranged with a distance of 2-3 mm therebetween;

[0024] The second grid comprises at least 5 rows of second air holes and second diffusion protrusions distributed between the second air holes.

[0025] In further embodiments, the diffusion protrusions are directed towards the outer circle, the height of the diffusion protrusions is no less than 1.5 mm; and the back of the diffusion protrusions is concave.

[0026] In further embodiments, the mesh member comprises at least an inner layer formed by rolling the first grid and an outer layer formed by rolling the second grid; the first diffusion protrusions abut against the inner side smooth curve of the outer layer.

[0027] A gas generator comprising a generator housing and further comprising the filtering structure for inflating and ejecting the airbag of the safety airbag according to any one of the preceding embodiments, the filtering structure being assembled in the generator housing; the inside of the filtering structure is used for placing the to-be-ignited tablet.

[0028] Advantages:

[0029] 1. The mesh member disperses the explosion energy of high-pressure air into a larger space, reduces the direct destructive power, and effectively filters for the first time.

[0030] Meanwhile, the mesh member has lower hardness than the air hole member, which can reduce the impact of high-pressure gas and prolong the use effect and time of the filtering structure. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a filtering structure expansion structure schematic diagram of the utility model.

[0032] Figure 2 is a filtering structure schematic diagram of the utility model.

[0033] Figure 3 is a mesh member local structure schematic diagram of the utility model.

[0034] Figure 4 is another kind of filter structure of the utility model is unfolded schematic view.

[0035] The annotations in the figure are: mesh member 1, air hole member 2, vertex 3, edge 4, first grid 5, second grid 6, first air hole 7, first diffusion protrusion 8, second air hole 9, second diffusion protrusion 10. DETAILED DESCRIPTION

[0036] The utility model will be further described below in conjunction with the drawings.

[0037] Example one

[0038] Based on the problems mentioned in the background art, the application proposes an air filter structure for local air instantaneous explosion, as shown in Figure 1 The main components include mesh member 1, air hole member 2, the width W1 of mesh member 1 is less than or equal to 35 mm, the maximum thickness is less than or equal to 1 mm, mesh member 1 is welded with mesh member 1, mesh member 1 is a planar rectangle, the shape of air hole member 2 is adapted to mesh member 1, which can also be a planar rectangle, a new strip-shaped member is formed by welding, the strip-shaped member is rolled and fixed with a preset diameter, forming a filter structure with multiple filter layers, the innermost diameter of the filter structure is greater than or equal to 30 mm, and the outermost diameter is less than or equal to 35 mm, wherein mesh member 1 is rolled into at least one layer, air hole member 2 is rolled into at least two layers, and the rolling is continuous, at least three layers. Then in actual use, air is instantaneously exploded inside the rolled annular filter structure, air is rapidly filtered through the multiple layers of rolled curved surfaces inside, and rapidly overflowed outward, in this process, the above structure realizes effective filtration of particulate matter.

[0039] In this embodiment, the hardness of mesh member 1 is lower than that of air hole member 2.

[0040] In this embodiment, the maximum filter layer number of the filter structure is 5, mesh member 1 is rolled into at least three layers, air hole member 2 is rolled into at least two layers, mesh member 1 is subjected to first wave rapid filtration, and air hole member 2 is subjected to filtration again.

[0041] In the design, the mesh hole area of mesh member 1 is less than the air hole area of air hole member 2, and the unit quantity of mesh holes of mesh member 1 is higher than the unit quantity of air holes of air hole member 2. In this embodiment, the purpose of mesh member 1 is rapid filtration, and the resistance to air is minimized as much as possible, so a high-density mesh structure is selected. Then in this scheme, the service life of the filter structure can be prolonged.

[0042] At the same time, the air is instantaneously exploded, the reticular component 1 is optimized to be able to shunt the air after the explosion, and the method for controlling the explosion shock wave and reducing the destructive effect is aimed at, and the specific optimization scheme is that the reticular component 1 comprises: vertices 3 and edge 4 alternately connected with the vertices 3, that is, a plurality of vertices 3 are linearly and uniformly distributed at a preset interval, and the two ends of the edge 4 are connected to the vertices 3, the edge 4 is a structure with thick two ends and thin middle, and 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 and tries to find the path with the smallest resistance to diffuse outward. The role of the reticular structure is to provide multiple dispersed outlets for the air, thereby effectively dispersing the explosion energy to a larger space range, reducing the pressure peak in a single direction, and further reducing the direct damage. The thickness of the vertex 3 is higher than the thickness of the edge 4, and a convex structure is relatively formed, which further enhances the above effect.

[0043] The reticular component 1 in the 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. The grid layout is as in the technology of the patent application No. CN202420218561.8.

[0044] Unlike the existing technical solutions, as shown in Figure 1 There is no obvious gap between the first grid 5 and the second grid 6, the first grid 5 at least comprises 4 rows of first air holes 7, and a first diffusion protrusion 8 is arranged between the first air holes 7 in each row in the horizontal direction, and the first air holes 7 and the first diffusion protrusions 8 are alternately arranged in the vertical direction. A smooth mounting part not less than 5mm is arranged on the upper and lower sides of the first grid. The distance between each row of first air holes 7 and the first air holes 7 is 1.5mm to 2mm, and the aperture of the first air hole 7 is 1mm to 2mm. The distance between each row of first diffusion protrusions 8 and the first diffusion protrusions 8 is 1.5mm to 2mm. The distance between the first air hole 7 and the first diffusion protrusion 8 is 2mm to 3mm.

[0045] And the second grid 6 at least comprises 5 rows of second air holes 9 and second diffusion protrusions 10 distributed between the second air holes 9 and the second air holes 9. When winding, the first grid 5 is located in the inner layer, and the first grid 5 is located in the outer layer. The first diffusion protrusion 8 is in contact with 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 1.5mm.

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

[0047] Working principle: local explosion, air in the internal instantaneous expansion of the filter structure, high pressure air carrying various particulate matter, through the mesh member 1 is rolled into the first filter layer, first filter large particles, at the same time, the mesh member 1 will high pressure air explosion energy dispersed to a larger space, reduce its direct destructive power, high pressure air through the air hole member 2, filter again.

[0048] Example two

[0049] In this embodiment, the number of layers of the mesh member 1 is 1, the width is 15mm, the minimum inner diameter is 10mm, the number of layers of the air hole member 2 is 2, the width is adapted to the width of the mesh member 1, and the maximum outer diameter after rolling is 17mm, the air hole member 2 is wrapped outside the mesh member 1, forming the first type of filter structure.

[0050] The filter structure parameters of this embodiment are determined, which meet the requirements of at least three test parameters of air permeability, pressure and light, and the test parameters meet the requirements of the standard GB20075-2006 "performance requirements and test methods for front and side protection devices for automobile occupants".

[0051] Example three

[0052] In this embodiment, the number of layers of the air hole member 1 is 2, the width is 27.5mm, the minimum inner diameter is 46.5mm, the number of layers of the mesh member 2 is 3, the width is adapted to the width of the mesh member 1, and the maximum outer diameter after rolling is 52mm, the air hole member 2 is wrapped outside the mesh member 1, forming the second type of filter structure.

[0053] The filter structure parameters of this embodiment are determined, which meet the requirements of at least three test parameters of air permeability, pressure and light, and the test parameters meet the requirements of the standard GB20075-2006 "performance requirements and test methods for front and side protection devices for automobile occupants".

[0054] Example four

[0055] In this embodiment, the number of layers of the air hole member 1 is 2, the width is 26.5mm, the minimum inner diameter is 58mm, the number of layers of the mesh member 2 is 5, the width is adapted to the width of the mesh member 1, and the maximum outer diameter after rolling is 67mm, the air hole member 2 is wrapped outside the mesh member 1, forming the third type of filter structure.

[0056] The filter structure parameters of this embodiment are determined, which meet the requirements of at least three test parameters of air permeability, pressure and light, and the test parameters meet the requirements of the standard GB20075-2006 "performance requirements and test methods for front and side protection devices for automobile occupants".

[0057] Embodiment five

[0058] The embodiment is a generator for airbag ejection of a vehicle, the generator housing, the filter structure for airbag inflation ejection of the safety airbag bag in embodiment 1, the filter structure is used for assembling in the generator housing, the inside of the filter structure is used for placing the ignition tablet, the gas in the space formed by the filter structure and the generator housing is rapidly expanded by the ignition medicine, most of the dregs are filtered by the filter structure, and the airbag is reached by passing through the preset pipeline through the generator housing.

[0059] The embodiment can be specifically assembled with the parameter settings of the three models in embodiment 2, embodiment 3 and embodiment 4.

[0060] Based on this, the embodiment gives a detailed structure: the number of filter structures is at least one, and further includes a bearing seat, a cylindrical member, an inner top cover and an outer top cover.

[0061] The bearing seat is provided with a stepped circular groove, the stepped circular groove is at least two stepped structures, the area where the diameter of the stepped circular groove is the smallest is used for placing the filter structure, a through hole is opened at the bottom of the circular groove for mounting the cylindrical member, the cylindrical structure is hollow, and the diameter of the cylindrical structure is smaller than the inner diameter of the filter structure, a plurality of air holes are opened on the side surface of the cylindrical structure, the cylindrical structure is used as an ignition structure, the edge of the inner top cover is bent to form a matching part, the inner top cover is pressed against the top of the cylindrical member, the matching part is located in the inside of the filter structure and is pressed against the surface of the rolled net-shaped member, the outer top cover is fixedly assembled with the bearing seat, the outer top cover is provided with a second groove, the shape of the second groove is matched with the stepped circular groove, at least one mounting hole is opened at the top of the outer top cover for mounting a gas guiding assembly, and the gas guiding assembly is pressed against the inner top cover. Then in use, the ignition tablet is ignited in the annular space formed by the cylindrical structure and the filter structure, the gas in the generator instantaneously expands, the gas passes through the filter structure, reaches the annular interval formed by the outside of the filter structure and the generator, and is sprayed through the gas guiding assembly.

[0062] Based on this, compared with Figure 1 In actual use, the filter structure and the stepped circular groove are not matched in installation, and therefore a structure as shown in Figure 4 is proposed, the positions of the first grid and the second grid are exchanged, and the smooth mounting part is assembled.

[0063] The above is only the preferred embodiment of the present application, and it should be pointed out that: for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the present application.

Claims

1. A filter structure for an airbag cushion inflation deployment, characterized by, The application relates to a filter structure for airbag inflation and ejection. The filter structure comprises a net-shaped component, a gas-hole-shaped component, and a strip-shaped component. The net-shaped component is in a planar rectangular shape with a width W1 of less than or equal to 40 mm.

2. The filter structure for an airbag according to claim 1, wherein The gas-hole-shaped component is in a shape matched with the net-shaped component and has gas holes distributed on the surface. The net-shaped component is connected to the end of the net-shaped component to form the strip-shaped component.

3. The filter structure for airbag inflation according to claim 1, wherein The strip-shaped component is rolled and fixed with a preset diameter to form a filter structure with multiple filter layers. The innermost circle of the filter structure has a diameter of greater than or equal to 10 mm, and the outermost circle has a diameter of less than or equal to 70 mm.

4. The filter structure for airbag module according to claim 1, wherein The net-shaped component is rolled into at least one layer. The gas-hole-shaped component is rolled into at least two layers.

5. The filter structure for an airbag according to claim 1, wherein The gas-hole-shaped component is arranged outside the net-shaped component.

6. The filter structure for an airbag according to claim 1, wherein The net-shaped component is rolled into one layer, has a width of 15 mm, and has a minimum inner diameter of 10 mm. The gas-hole-shaped component is rolled into two layers and has a maximum outer diameter of 17 mm. The net-shaped component is rolled into three layers, has a width of 27.5 mm, and has a minimum inner diameter of 46.5 mm.

7. The filter structure for an airbag according to claim 1, wherein The gas-hole-shaped component is rolled into two layers and has a maximum outer diameter of 52 mm.

8. The filter structure for airbag inflation according to claim 7, wherein The net-shaped component is rolled into five layers, has a width of 26.5 mm, and has a minimum inner diameter of 58 mm. The gas-hole-shaped component is rolled into two layers and has a maximum outer diameter of 67 mm. The net-shaped component has a mesh area smaller than the gas-hole-shaped component and has a unit quantity of meshes higher than that of the gas-hole-shaped component. The net-shaped component has a hardness lower than that of the gas-hole-shaped component.

9. The filter structure for an airbag according to claim 8, wherein The net-shaped component comprises a vertex and a ridge.

10. The filter structure for an airbag according to claim 8, wherein The vertex is linearly and uniformly distributed at a preset interval.

11. A gas generator comprising a generator housing, characterised in that The ridge is connected to the vertex at both ends and has a structure with thick ends and a thin middle part. The straight line where the ridge is located and the straight line where the vertex is located form an angle of 30-60 degrees. The net-shaped component comprises at least a first grid and a second grid. The first grid comprises at least four rows of first gas holes. The first grid is provided with a smooth mounting part with a length of not less than 5 mm on both sides. In the horizontal direction, the first gas holes are provided with first diffusion protrusions between the first gas holes. The distance between the first gas holes in each row is 1.5-2 mm. The diameter of the first gas holes is 1-2 mm. The distance between the first diffusion protrusions in each row is 1.5-2 mm. In the vertical direction, the first gas holes and the first diffusion protrusions are alternately arranged with a distance of 2-3 mm. The second grid comprises at least five rows of second gas holes and second diffusion protrusions arranged between the second gas holes. The diffusion protrusions are directed to the outer circle and have a height of not less than 1.5 mm. The back of the diffusion protrusion is concave. The net-shaped component comprises an inner layer formed by rolling the first grid and an outer layer formed by rolling the second grid. The first diffusion protrusion is arranged on the inner side of the smooth curve of the outer layer. The application further relates to a filter structure for airbag inflation and ejection.

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