A filter cartridge for airbag gas filtration

Abstract

The application discloses a filter core for airbag gas filtering, which comprises a core sheet, and oblique holes are uniformly arranged on the core sheet, and the oblique holes have the same opening direction; the two sides of the oblique holes are connected with the core sheet through the protrusions formed by stamping to form reinforcing ribs. When the filter core sheet is single-layer filtered, the direction of the holes is inclined to the plate surface, which is beneficial to block the residues and the flame; when the filter core sheet is multi-layer filtered, the oblique holes of the adjacent layers are arranged in a staggered mode to guide the filtering direction to present an irregular path, thereby prolonging the filtering path, effectively blocking the residues and the flame, ensuring the stability and uniformity of the output airflow, and minimizing the number of layers of the filter core, thereby reducing the weight of the filter core and lowering the manufacturing cost.

Description

Technical Field

[0001] This invention relates to gas filtration for airbags, and more particularly to a filter core suitable for airbag gas filtration. Background Technology

[0002] Currently used steel mesh filters mostly employ VEM (variable perforated steel mesh) and SEM (single perforated steel mesh). The working principle of the filter is to block the explosives and high-temperature gases generated when the gas generator inside the airbag detonates by passing them through the steel mesh of each layer of the filter to block residues and flames.

[0003] The existing structural drawbacks are as follows: 1. In single-layer filtration, the opening direction of the pores is perpendicular to the plate surface, which is consistent with the filtration direction perpendicular to the plate surface. High-temperature gas will pass directly through the filter holes, resulting in a short filtration path, which is not conducive to blocking residues and flames; 2. In multi-layer filtration, there are gaps between layers, which allows high-temperature gas to move freely in the gaps between adjacent layers, resulting in uneven and unstable output airflow; 3. After rolling and forming, the filtration direction of the pores is perpendicular to the plate surface. When the pore diameter is <1 and the number of stacked layers is 4-8, local / area through-holes will appear when the opening areas of each layer are stacked. This will shorten the filtration path and is not conducive to blocking residues and flames. In order to achieve the function of blocking residues / flames, the pore diameter needs to be reduced or the number of stacked layers needs to be increased, which will increase the overall weight of the filter and increase the cost. Summary of the Invention

[0004] The purpose of this invention is to design a filter core for airbag gas filtration that has a reasonable structure and good performance.

[0005] The technical solution of the present invention is,

[0006] A filter core for airbag gas filtration includes a core sheet, characterized in that: evenly distributed oblique holes are formed on the core sheet, and the opening direction of the oblique holes is consistent; protrusions formed by stamping on both sides of the oblique holes are connected to the core sheet to form reinforcing ribs; the hole height of the oblique holes on the core sheet is 0.1-3mm; and the opening positions from top to bottom are staggered.

[0007] Furthermore, the opening shape can be various shapes, such as rectangular, triangular, arc-shaped, or polygonal.

[0008] A filter core made using the above-mentioned core sheet is characterized in that: a single core sheet is integrally bent into a multi-layered circular ring shape, wherein the multi-layered shape consists of two or more layers.

[0009] The arrangement of the multi-layered annular core sheets is such that the opening positions of the core sheets in adjacent layers are staggered.

[0010] The beneficial effects of the present application are:

[0011] 1. When the filter core piece is single-layer filtered, the opening direction of the hole is inclined to the plate surface, and the filtering direction is perpendicular to the plate surface, which is beneficial to block residues and flames; 2. When the filter core piece is multi-layer filtered, the inclined holes of adjacent layers are arranged in a staggered manner to guide the filtering direction to present an irregular path, thereby prolonging the filtering path, blocking residues and flames, and ensuring the stability and uniformity of the output airflow; when the mesh arrangement changes the hole type of each layer, the hole type change includes but is not limited to the following: hole height, opening shape, opening position, and the hole diameter of the filter core is completely covered in the filtering direction, avoiding the through-hole phenomenon of the product, which is beneficial to block residues and flames; 3. The natural forming reinforcing ribs on the filter core piece effectively improve the strength of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the front view of the present application,

[0013] Figure 2 is the A-A side view of the present application,

[0014] Figure 3 is Figure 2 the enlarged view of part A,

[0015] Figure 4 is the structure diagram of the annular filter,

[0016] Figure 5 is Figure 4 the enlarged view of part B,

[0017] Figure 6 is the structure diagram of the hole with a rectangular shape and the hole forming tool, and the hole forming tool is located at the top of the figure, and the corresponding hole shape is located at the bottom,

[0018] Figure 7 is the structure diagram of the hole with a triangular shape and the hole forming tool, and the hole forming tool is located at the top of the figure, and the corresponding hole shape is located at the bottom,

[0019] Figure 8 is the structure diagram of the hole with an arc shape and the hole forming tool, and the hole forming tool is located at the top of the figure, and the corresponding hole shape is located at the bottom,

[0020] Figure 9 is the structure diagram of the hole with a polygonal shape and the hole forming tool, and the hole forming tool is located at the top of the figure, and the corresponding hole shape is located at the bottom. DETAILED DESCRIPTION

[0021] Embodiments are described in detail below with reference to the accompanying drawings,

[0022] Embodiment 1,

[0023] A filter core for airbag gas filtering, comprising a core sheet 1, on which oblique holes 3 are uniformly arranged, the oblique holes having the same opening direction; the two sides of the oblique holes are connected with the core sheet by a protrusion formed by stamping to form a reinforcing rib 4; the protrusion top surface 5 of the oblique hole covers the oblique hole, and the core sheet between adjacent oblique holes has a non-hole area 2.

[0024] The opening shape of the oblique hole arranged on the core sheet in the structure described in the embodiment can be adjusted when single-layer filtering is implemented, which determines that the cross-sectional shape of the gas passing through the oblique hole can be adjusted, that is, the gas flow passing through the oblique hole can be adjusted. By adjusting the opening shape, the gas flow is adjusted, which can meet different filtering requirements. Figures 6-9 The opening shape shown in the figure is a rectangle, a triangle, an arc, or a polygon, which can meet various filtering requirements.

[0025] The structure described in the embodiment has the oblique holes (such as Figure 1 ) uniformly arranged on the core sheet when single-layer filtering is implemented, which are at a certain angle with the filtering direction perpendicular to the core sheet. When the gas is filtered, the gas first collides with the top surface of the oblique hole and then changes the flow direction of the gas along the outlet direction of the oblique hole. In this process, the residues in the gas are blocked, and the filtering direction of the gas is guided. At the same time, when the gas is filtered, the reinforcing rib formed by the two side surfaces of the top surface can effectively improve the strength of the filter core, thereby reducing the deformation degree of the filter core caused by the gas production pressure of the airbag gas generator when the gas production drug point explodes, and improving the filtering precision of the filter.

[0026] The opening size of the oblique hole arranged on the core sheet can be adjusted when single-layer filtering is implemented. The hole height of the oblique hole in the embodiment can be selected in the range of 0.1-3 mm. The angle size (that is, the included angle between the top surface and the core sheet) and the size of the opening will respectively affect the filtering direction of the gas and the flow of the gas passing through. By adjusting the opening size, the flow direction of the gas and the flow of the gas are adjusted, which can meet different filtering requirements. On the same core sheet, multiple hole heights can also be made to meet different filtering requirements.

[0027] Embodiment 2,

[0028] As shown in Figure 4 , 5 , on the basis of embodiment 1, a filter core is made from the core sheet described in embodiment 1,

[0029] The single core body sheet is integrally bent into a multi-layer circular ring, and the multi-layer is two or more layers; the core body sheet of the multi-layer circular ring is arranged in a staggered manner in adjacent layers.

[0030] Such a structure shows that:

[0031] The structure described in the embodiment can reduce the number of layers of the filter core to the maximum extent while meeting the requirements of the filtering performance, thereby reducing the weight of the filter core; the number of layers can be reduced to the maximum extent, the thickness of the plate can be reduced, and the hole type can be increased while meeting the requirements of the filtering strength, thereby achieving good process realizability and effectively reducing the cost.

[0032] The structure described in the embodiment uses the uniformly distributed inclined holes on the filter core sheet for filtering, and the opening shape of the holes can be uniform or different, especially after the multi-layer filter core sheets are combined in a staggered manner, the positions of the inclined holes in adjacent layers make the gas to be filtered need to pass through a more complex path to pass through each inclined hole, thereby ensuring the filtering effect such as blocking residues, blocking flames, ensuring the stability and uniformity of the output gas flow; from Figure 4 and Figure 5 As can be seen, due to the staggered arrangement of the opening positions of the core body sheets in adjacent layers in the structure of the filter core, once the gas passes through the filter core, the gas filtering direction will be guided into the second layer by the inclined hole, will encounter the non-hole area of the second layer, and then will find the inclined hole on both sides from the non-hole area, further guiding the gas to change the flow direction, prolonging the filtering path of the gas, effectively blocking the residues and flames in the gas, and at the same time ensuring the stability and uniformity of the gas filtering, the residues and flames in the gas need to turn several times in the core body before being finally filtered out, thereby ensuring the filtering effect to the maximum extent.

[0033] The structure described in the embodiment can adjust the opening size and shape of the inclined hole when implementing multi-layer filtering, so that the gas flow and gas flow direction of each layer of core body sheet can be adjusted, thereby adjusting the gas flow and gas flow direction of the entire filter core to meet different filtering requirements.

[0034] The filter core can effectively filter residues when the gas generating agent point of the air bag explodes, thereby preventing the air bag from being punctured; at the same time, the filter core can effectively filter flames, thereby preventing the air bag from being burned through; the strength of the filter core is high, the deformation degree of the filter core caused by the gas generation pressure generated when the gas generating agent point of the air bag gas generator explodes is reduced, thereby ensuring the stability of the filtering precision, and ensuring the performance stability of the air bag.

[0035] The above embodiments are merely exemplary and are not intended to limit the embodiments. Based on the above description, those skilled in the art can further make modifications and variations to the embodiments. The modifications and variations do not depart from the scope of the embodiments.

Claims

1. A filter cartridge for use in filtering gas for an airbag, comprising a cartridge sheet, characterised in that: The core piece is provided with uniformly distributed oblique holes, and the opening direction of the oblique holes is consistent; the two sides of the oblique holes are connected with the core piece through the protrusions formed by stamping to form reinforcing ribs, the top surface of the protrusions of the oblique holes covers the oblique holes, the pore size of the filter core is completely covered in the filtering direction, and the opening direction of the oblique holes is inclined to the plate surface; when the gas is filtered, the gas first collides with the top surface of the oblique hole, and then changes the flow direction of the gas along the outlet direction of the oblique hole; in this process, the residues in the gas are blocked, and the filtering direction of the gas is guided; the hole height of the oblique holes on the core piece is 0.1-3mm; the hole opening positions of the core piece from top to bottom are staggered.

2. A filter cartridge for filtering inflator gas for an airbag as defined in claim 1, wherein: The opening shape of the oblique hole is at least one of a rectangle, a triangle and an arc.

3. A filter cartridge for filtering inflator gas for an airbag as defined in claim 1, wherein: The single core piece is integrally bent into a multi-layer circular ring, and the multi-layer is two or more layers.

4. A filter cartridge for filtering inflator gas for an airbag as defined in claim 3, wherein: The arrangement of the multi-layer circular ring core piece is that the hole opening positions of the core pieces of adjacent layers are staggered.

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