Steel plate mesh filter screen

Abstract

The utility model discloses a steel plate mesh filter screen, and aims to provide a steel plate mesh filter screen beneficial to improving the filtering effect, which comprises a filter screen body, the filter screen body is a multi-layer cylinder structure formed by winding a steel plate for multiple times, welding and fixing, the filter screen body is divided into a plurality of layer bodies from inside to outside, and a plurality of filtering holes are arranged on the layer bodies. A plurality of filtering holes are formed in the innermost layer body of the filter screen body, a plurality of filtering holes are formed in the outermost layer body of the filter screen body, a plurality of filtering holes are formed in the top of the layer body, filtering holes in the other layer bodies are uniformly formed in the corresponding layer bodies, and the opening directions and the opening sizes of the filtering holes among the plurality of layer bodies are different from one another. The filter screen has the beneficial effects that gas enters from the innermost layer of the filter screen body and then is subjected to path turning for multiple times, so that the aim of improving the filtering effect is fulfilled; the strength of the filter screen body is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter screens, in particular to a expanded metal filter screen. Background Art

[0002] An airbag is a very important safety device in an automobile. When an accident occurs to the automobile, it can effectively reduce the harm of the accident to the human body, thereby protecting the lives of the driver and passengers.

[0003] An airbag mainly consists of components such as a gas generator, a combustion chamber, a filter / filter screen, a transfer powder / propagating powder, a gas-producing powder / gas-producing agent, an igniter / ignition tube, an exhaust hole, a partition plate, a cartridge, etc. Gas generator: A component that generates and releases gas in an automobile airbag system. Combustion chamber: A cavity in the gas generator filled with a gas-producing powder (gunpowder). Filter / filter screen: Filters the generated gas, retains the solid residues therein, and has a certain cooling effect on the high-temperature gas; usually made of metal materials. Transfer powder / propagating powder: A kind of gunpowder that amplifies the ignition energy and successfully ignites the gas-producing powder. Gas-producing powder / gas-producing agent: The main gas source, which converts solid chemical substances into gas through a rapid combustion chemical reaction. Igniter / ignition tube: A pyrotechnic component that can quickly ignite the transfer powder by being triggered by an electrical signal. Exhaust hole: The gas generated by the generator is released to the airbag through the exhaust hole as required gas. Partition plate: A part that divides the gas-producing powder combustion chamber into different independent spaces, with or without through holes thereon. Cartridge: A part with an independent enclosed space for containing the gas-producing powder.

[0004] The traditional punched plate mesh filter screen used in the gas generators on the current market has a simple structure, low axial and radial strength, and generally average filtering effect due to the single punching direction. Content of the Utility Model

[0005] The utility model is to overcome the deficiency of the general filtering effect of the filter screen in the gas generator in the prior art, and provides an expanded metal filter screen which is beneficial to improving the filtering effect.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An expanded metal filter screen, which comprises a filter screen body. The filter screen body is a multi-layer cylindrical structure formed by winding and welding a steel plate multiple times. The filter screen body is divided into several layers from the inside to the outside. A plurality of filter holes are provided on the layer body. A plurality of filter holes on the innermost layer body of the filter screen body are all distributed at the bottom of the layer body. A plurality of filter holes on the outermost layer body of the filter screen body are all distributed at the top of the layer body. The filter holes on the remaining layer bodies are evenly distributed on the corresponding layer bodies. The opening directions and opening sizes of the filter holes between several layer bodies are all different from each other.

[0008] The filter screen body is a multi-layer cylindrical structure formed by winding and welding a steel plate multiple times. The filter screen body is divided into several layers from the inside to the outside. A number of filter holes are provided on the layer body. A number of filter holes on the innermost layer body of the filter screen body are evenly distributed at the bottom of the layer body. A number of filter holes on the outermost layer body of the filter screen body are evenly distributed at the top of the layer body. The filter holes on the remaining intermediate layer bodies are evenly distributed on the corresponding layer bodies, and the opening directions and opening sizes of the filter holes between the layer bodies are different from each other. In the utility model, by punching filter holes on the same steel plate, the overall cost is relatively low; since there are other components sealing both the top and bottom of the filter screen body, and only the bottom of the innermost layer of the filter screen body has filter holes opened, the gas generated after the combustion of the gas-producing agent of the generator can only enter the interior of the filter screen body from here. After passing through the filtration of several intermediate filter layer bodies, since only the top of the outermost layer of the filter screen body has filter holes opened, the gas escapes from here; since the opening directions and opening sizes of the filter holes between the remaining intermediate layer bodies are different from each other, the gas makes multiple path turns after entering from the innermost layer of the filter screen body, thereby achieving the purpose of facilitating the improvement of the filtration effect.

[0009] Preferably, a number of filter holes on the innermost layer body of the filter screen body are linearly and evenly distributed at the bottom of the layer body, so that the gas generated after the combustion of the gas-producing agent of the generator can only enter the interior of the filter screen body from here. The remaining part of the innermost layer body of the filter screen body is in a state without holes opened, which is beneficial to increasing the strength of the filter screen body.

[0010] Preferably, a number of filter holes on the outermost layer body of the described filter screen body are linearly and evenly distributed at the top of the layer body, so that the gas escapes from here. The remaining part of the outermost layer body of the filter screen body is in a state without holes opened, which is beneficial to increasing the strength of the filter screen body.

[0011] Preferably, the number of layer bodies is six. The several layer bodies on the filter screen body are successively in the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer from the inside to the outside. The opening directions and opening sizes of the filter holes between the six layer bodies are different from each other. On the one hand, it is convenient for the gas in the innermost layer channel of the filter screen body to make multiple path turns, thereby achieving the purpose of facilitating the improvement of the filtration effect; on the other hand, it is beneficial to enhancing the strength of the overall structure of the filter screen body.

[0012] The beneficial effects of the utility model are as follows: By punching filter holes on the same steel plate, the overall cost is relatively low; the gas makes multiple path turns after entering from the innermost layer of the filter screen body, thereby achieving the purpose of facilitating the improvement of the filtration effect; it is beneficial to increasing the strength of the filter screen body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 It is a schematic structural diagram of the actual application of the filter screen body.

[0015] In the figure: 1. Filter screen body, 2. Layer body, 3. Filter holes. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0017] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components set forth in these embodiments do not limit the scope of this application. For ease of description, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to describe the relationship of one element or feature shown in the figure with respect to another element or feature. It should be understood that, in addition to the orientations shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be fixed "above" the other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be fixed in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, processes, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, processes, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. 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, it does not need to be further discussed in subsequent drawings.

[0019] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings, and therefore, they cannot be understood as limiting the protection scope of this application.

[0020] As Figure 1 and Figure 2 In the described embodiment, a expanded metal filter screen includes a filter screen body 1. The filter screen body 1 is a multi-layer cylindrical structure formed by winding and welding a steel plate multiple times. The filter screen body 1 is divided into several layers 2 from the inside to the outside. A number of filter holes 3 are provided on the layer 2. A number of filter holes 3 on the innermost layer 2 of the filter screen body 1 are evenly distributed at the bottom of the layer 2. A number of filter holes 3 on the outermost layer 2 of the filter screen body 1 are evenly distributed at the top of the layer 2. The filter holes 3 on the remaining intermediate layers 2 are evenly distributed on the corresponding layer 2, and the opening directions and opening sizes of the filter holes 3 between the layers 2 are all different from each other.

[0021] A number of filter holes 3 on the innermost layer 2 of the filter screen body 1 are linearly and evenly distributed at the bottom of the layer 2, and the remaining part of the innermost layer 2 of the filter screen body 1 is in an unopened state.

[0022] A number of filter holes 3 on the outermost layer body 2 of the filter screen body 1 are linearly and evenly distributed at the top of the layer body 2, and the remaining part of the outermost layer body 2 of the filter screen body 1 is in an unperforated state.

[0023] The number of layer bodies 2 is six. A number of layer bodies 2 on the filter screen body 1 are successively in the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer from the inside to the outside. The opening directions and opening sizes of the filter holes 3 between the six layer bodies 2 are all different from each other.

[0024] In the present utility model, the filter holes 3 are punched on the same steel plate, so that the overall cost is relatively low; since there are other components sealing the top and bottom of the filter screen body 1, only the bottom of the innermost layer of the filter screen body 1 is provided with filter holes 3. After the gas generated by the generator gas-producing agent burns, the gas can only enter the inside of the filter screen body 1 from here. After being filtered by several intermediate filter layer bodies 2, since only the top of the outermost layer of the filter screen body 1 is provided with filter holes 3, the gas escapes from here; the gas enters the channel from the innermost layer of the filter screen body 1 and undergoes multiple path turns, thereby achieving the purpose of facilitating the improvement of the filtering effect. The specific gas filtering path is as Figure 2 shown by the arrow.

[0025] During the above filtering process, in order for the gas to undergo multiple path turns after entering the filter screen body 1, the opening directions and opening sizes of the filter holes between the intermediate layer bodies 2 are all different from each other, or the opening directions and opening sizes of the filter holes between all layer bodies 2 are all different from each other.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A expanded metal filter screen, characterized in that, It includes a filter screen body (1), and the filter screen body (1) is a multi-layer cylinder structure formed by winding a steel plate multiple times and welding and fixing. The filter screen body (1) is divided into several layers of bodies (2) from the inside to the outside. A number of filter holes (3) are provided on the layer of body (2). A number of filter holes (3) on the innermost layer of body (2) of the filter screen body (1) are all distributed at the bottom of the layer of body (2). A number of filter holes (3) on the outermost layer of body (2) of the filter screen body (1) are all distributed at the top of the layer of body (2). Filter holes (3) on the remaining intermediate layers of body (2) are evenly distributed on the corresponding layer of body (2), and the opening directions and opening sizes of the filter holes (3) between the layers of body (2) are all different from each other.

2. The expanded metal filter screen according to claim 1, characterized in that, A number of filter holes (3) on the innermost layer of body (2) of the filter screen body (1) are linearly and evenly distributed at the bottom of the layer of body (2), and the remaining part of the innermost layer of body (2) of the filter screen body (1) is in an unopened state.

3. The expanded metal filter screen according to claim 1, characterized in that, A number of filter holes (3) on the outermost layer of body (2) of the filter screen body (1) are linearly and evenly distributed at the top of the layer of body (2), and the remaining part of the outermost layer of body (2) of the filter screen body (1) is in an unopened state.

4. A expanded metal filter screen according to claim 1 or 2 or 3, characterized in that, The number of the layers of body (2) is six. A number of layers of body (2) on the filter screen body (1) are successively in the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer from the inside to the outside. The opening directions and opening sizes of the filter holes (3) between the six layers of body (2) are all different from each other.

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