Filter, gas generator and automobile safety air bag

Abstract

The invention relates to the technical field of gas generators, in particular to a filter, a gas generator and an automobile safety airbag. The filter comprises an inner filter screen, an outer filter screen and a middle filter screen; the inner filter screen, the outer filter screen and the middle filter screen are all annularly arranged, the outer filter screen is arranged on the periphery of the inner filter screen, and the outer filter screen and the inner filter screen are spaced to form a filter cavity; the middle filter screen is arranged in the filter cavity and abuts against one or two of the inner filter screen and the outer filter screen. The filter is applied to a gas generator of an automobile safety air bag, is simple in structure and convenient to install, can reduce the flow speed of gas generated by the gas generator, can precipitate residues, reduces discharged residues, protects the automobile safety air bag, and is low in manufacturing and using cost.

Description

Technical Field

[0001] The invention relates to the technical field of gas generators, and in particular to a filter, a gas generator and an automobile safety airbag. Background Art

[0002] As the core component of the automobile airbag, the automobile airbag gas generator is responsible for quickly inflating and deploying the airbag when the vehicle collides, providing effective collision protection for passengers. The filter is a key component in the airbag gas generator. With the lightweight of automobiles and the improvement of the performance of gas-generating agents, the design of efficient and more cost-effective filters is very important. In order to meet the use requirements, the existing gas generator adopts a method of setting up multiple filter combinations, which has a complex structure and heavy weight, is not conducive to lightweight design, and has high cost. Summary of the invention

[0003] The purpose of the present invention includes providing a filter, a gas generator and a car airbag. The filter is applied to the gas generator of the car airbag, has a simple structure and is easy to install. It can not only reduce the flow rate of the gas generated by the gas generator, but also precipitate the residue, thereby reducing the discharged residue, thereby protecting the car airbag, and has low production and use costs.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a filter, the filter comprising an inner filter screen, an outer filter screen and an intermediate filter screen;

[0006] The inner filter, the outer filter and the middle filter are all arranged in a ring shape, and the outer filter is arranged on the periphery of the inner filter and is spaced apart from the inner filter to form a filter cavity;

[0007] The middle filter screen is arranged in the filter cavity and abuts against one or both of the inner filter screen and the outer filter screen.

[0008] In an optional embodiment, the intermediate filter screen divides the filter chamber into a plurality of sub-partitions.

[0009] In an optional embodiment, the middle filter screen includes a body and a protrusion, and a plurality of protrusions are arranged in a circular array around the axis direction of the inner filter screen;

[0010] The main body is in contact with the inner filter screen; the raised portion protrudes along the radial direction of the inner filter screen toward one side of the outer filter screen and is in contact with the outer filter screen.

[0011] In an optional embodiment, the protrusion is triangular in shape.

[0012] In an optional embodiment, the protrusion is rectangular.

[0013] In an optional embodiment, the filter further comprises a filling body filled in one or more of the sub-partitions, wherein the filling body is used to filter and cool the residue entering the sub-partition.

[0014] In an alternative embodiment, the filler body comprises a metal mesh or ceramic fibers.

[0015] In a second aspect, the present invention provides a gas generator, the gas generator comprising a generator body, a gas generating agent, an ignition assembly and the above-mentioned filter;

[0016] The filter is arranged in the generator body and encloses a combustion chamber; the gas generating agent is placed in the combustion chamber of the generator body; the ignition assembly is connected to the generator body; and an exhaust port is arranged in the area of ​​the generator body facing the filter.

[0017] In an optional embodiment, a sealing foil is provided on the inner side of the exhaust port.

[0018] In a third aspect, the present invention provides an automobile airbag, which includes the above-mentioned gas generator.

[0019] The filter, gas generator and automobile airbag provided by the embodiments of the present invention have the following beneficial effects:

[0020] The filter is applied to the gas generator of the automobile airbag. During use, the filter can play a filtering role. Moreover, since the filter adopts a method in which an outer filter screen is arranged on the periphery of an inner filter screen and is separated from the inner filter screen to form a filter cavity, and an intermediate filter screen is arranged in the filter cavity and abuts against one or both of the inner filter screen and the outer filter screen, the structural strength of the filter during use can be improved, and its filtering effect can be improved. The flow rate of the gas generated by the gas generator can also be reduced, and the residue can be precipitated, thereby reducing the discharged residue, thereby protecting the automobile airbag. In addition, the filter has a simple structure and is easy to install, thereby reducing the cost of its production and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of the filter provided in this embodiment from a first viewing angle;

[0023] Figure 2 A schematic diagram of the structure of the filter provided in this embodiment from a second viewing angle;

[0024] Figure 3 A schematic diagram of the structure of another filter provided in this embodiment from a first viewing angle;

[0025] Figure 4 A schematic diagram of the structure of another filter provided in this embodiment under a second viewing angle;

[0026] Figure 5 This is a schematic diagram of the structure of the gas generator provided in this embodiment.

[0027] Icons: 100-filter; 110-inner filter; 120-outer filter; 130-middle filter; 101-filter chamber; 102-sub-partition; 131-main body; 132-raised portion; 200-gas generator; 210-generator body; 220-gas generating agent; 230-ignition assembly; 240-combustion chamber; 211-exhaust port. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0034] Please refer to Figure 1-Figure 5 , this embodiment provides a filter 100, the filter 100 includes an inner filter screen 110, an outer filter screen 120 and a middle filter screen 130;

[0035] The inner filter screen 110, the outer filter screen 120 and the middle filter screen 130 are all arranged in an annular shape, and the outer filter screen 120 is arranged at the periphery of the inner filter screen 110 and is spaced apart from the inner filter screen 110 to form a filter cavity 101;

[0036] The middle filter screen 130 is disposed in the filter cavity 101 and abuts against one or both of the inner filter screen 110 and the outer filter screen 120 .

[0037] Please refer to Figure 1-Figure 5 , the working principle of the filter 100 is:

[0038] The filter 100 is applied to the gas generator 200 of the automobile safety airbag. During use, the filter 100 is placed in the generator body 210, and after the gas generating agent 220 in the gas generator 200 generates gas, the generated gas is filtered by the filter 100 and then discharged from the exhaust port 211 thereof.

[0039] In this process, since the filter 100 adopts an inner filter screen 110, an outer filter screen 120 and an intermediate filter screen 130 configured in an annular shape, and the inner filter screen 110 and the outer filter screen 120 are separated to form a filter cavity 101, and the intermediate filter screen 130 is arranged in the filter cavity 101 and abuts against one or two of the inner filter screen 110 and the outer filter screen 120, such an arrangement can optimize the structure of the filter 100, thereby simplifying its structure, and at the same time, its structural strength can be improved by such an arrangement;

[0040] In addition, in the process of gas filtering using such a setting method, three-pass filtering can be formed based on the setting of the inner filter 110, the outer filter 120 and the middle filter 130, and the gas flow rate can be reduced based on the forming of the filter cavity 101; thereby, when playing the role of filtering, its filtering effect can be improved, and the flow rate of the gas generated by the gas generator 200 can be reduced, and the residue can be precipitated, thereby reducing the discharged residue, thereby protecting the automobile airbag; and its structure is simple and easy to install, thereby reducing the cost of its production and use.

[0041] For further information, please refer to Figure 1-Figure 5 In this embodiment, when the middle filter screen 130 is configured, the middle filter screen 130 divides the filter chamber 101 into a plurality of sub-partitions 102 . Moreover, the plurality of sub-partitions 102 are arranged in a circular array around the axis of the inner filter screen 110 .

[0042] When forming the aforementioned sub-areas 102, the present embodiment adopts that the middle filter screen 130 includes a body 131 and a protrusion 132, and the plurality of protrusions 132 are arranged in a circular array around the axis direction of the inner filter screen 110, so that the aforementioned plurality of sub-areas 102 can be formed in a circular array around the axis direction of the inner filter screen 110;

[0043] Moreover, such a setting makes the main body abut against the inner filter 110; the protrusion 132 protrudes along the radial direction of the inner filter 110 toward one side of the outer filter 120 and abuts against the outer filter 120, thereby being able to support the inner filter 110 and the outer filter 120 based on the intermediate filter 130 located in the filter chamber 101.

[0044] In addition, when configuring the above-mentioned protrusion 132, the protrusion 132 can be made to be triangular (such as Figure 1 and Figure 2 As shown), the raised portion 132 may also be rectangular (as shown Figure 3 and Figure 4 As shown), in other embodiments, it can also be set to other shapes.

[0045] For further information, please refer to Figure 1-Figure 5 In this embodiment, the filter 100 further includes a filling body filled in one or more sub-partitions 102, and the filling body is used to filter and cool the residue entering the sub-partition 102. When the filling body is provided, a metal wire mesh or ceramic fiber can be used to make the filling body.

[0046] Based on the above filter 100, please refer to Figure 1-Figure 5 , this embodiment further provides a gas generator 200, the gas generator 200 includes a generator body 210, a gas generating agent 220, an ignition assembly 230 and the above-mentioned filter 100;

[0047] Specifically, the above-mentioned filter 100 is arranged in the generator body 210 and encloses a combustion chamber 240; the gas generator 220 is placed in the combustion chamber 240 of the generator body 210; the ignition component 230 is connected to the generator body 210; and the generator body 210 is provided with an exhaust port 211 in the area facing the filter 100.

[0048] In addition, a sealing foil is provided on the inner side of the exhaust port 211, so that when the gas generator 200 is not producing gas, the exhaust port 211 is in a blocked state; and after it starts producing gas, the generated gas will break through the sealing foil and be discharged.

[0049] In summary, the gas generator 200 can improve its filtering effect by adopting the above-mentioned filter 100, and can also reduce the flow rate of the gas generated by the gas generator 200, precipitate the residue, thereby reducing the discharged residue, and further protecting the automobile airbag; and its structure is simple and easy to install, thereby reducing the cost of its production and use.

[0050] Based on the above filter 100, please refer to Figure 1-Figure 5 This embodiment also provides an automobile safety airbag, which includes the above-mentioned gas generator 200. By adopting the above-mentioned filter 100 and gas generator 200, it has all the advantages of the above-mentioned filter 100 and gas generator 200, so it will not be repeated here.

[0051] Please refer to Figure 1-Figure 5 When the filter 100 is applied to the gas generator 200 of the automobile airbag, the process is as follows:

[0052] When the ignition assembly 230 of the gas generator 200 is started, the ignition agent is ignited and burns rapidly, thereby igniting the gas generating agent 220 in the combustion chamber 240, and the generated gas is discharged through the filter 100 to the exhaust port 211, thereby filling the airbag of the automobile safety airbag to protect the passengers;

[0053] Among them, when the gas generated by the gas generator 220 enters the filter chamber 101 after being filtered by the inner filter 110, its pressure decreases, the gas flow rate slows down, and the space of the filter chamber 101 can precipitate some combustion residues. Then, the gas is filtered by the intermediate filter 130 and the inner filter 110 and flows out of the gas generator 200 from the exhaust port 211.

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A filter, characterized in that: The filter comprises an inner filter screen, an outer filter screen and a middle filter screen; The inner filter, the outer filter and the middle filter are all arranged in an annular shape, and the outer filter is arranged at the periphery of the inner filter and is spaced apart from the inner filter to form a filter cavity; The middle filter is disposed in the filter cavity and abuts against one or both of the inner filter and the outer filter.

2. The filter according to claim 1, characterized in that: The intermediate filter screen divides the filter chamber into a plurality of sub-partitions.

3. The filter according to claim 2, characterized in that: The middle filter screen comprises a body and a protrusion, and a plurality of the protrusions are arranged in a circular array around the axis direction of the inner filter screen; Wherein, the body abuts against the inner filter screen; the protrusion protrudes along the radial direction of the inner filter screen toward one side of the outer filter screen and abuts against the outer filter screen.

4. The filter according to claim 3, characterized in that: The protrusion is triangular in shape.

5. The filter according to claim 3, characterized in that: The raised portion is rectangular.

6. The filter according to claim 2, characterized in that: The filter further comprises a filling body filled in one or more of the sub-partitions, wherein the filling body is used for filtering and cooling the residue entering the sub-partitions.

7. The filter according to claim 6, characterized in that: The filler includes metal mesh or ceramic fiber.

8. A gas generator, characterized in that: The gas generator comprises a generator body, a gas generating agent, an ignition assembly and a filter as claimed in any one of claims 1 to 7; The filter is arranged in the generator body and encloses a combustion chamber; the gas generator is placed in the combustion chamber of the generator body; the ignition component is connected to the generator body; and the generator body is provided with an exhaust port in the area facing the filter.

9. The gas generator according to claim 8, characterized in that: A sealing foil is arranged on the inner side of the exhaust port.

10. An automobile airbag, characterized in that: The automobile airbag comprises the gas generator as claimed in claim 8 or 9.

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