JPH0722665B2 - Gas filter and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is combined with a gas generator such as an airbag for an automobile, an injection device for an emergency escape seat of an aircraft, an emergency opening / closing device for a valve, and a buoyancy generator for a ship. And a method for manufacturing the same.

(Prior Art) As a gas generator of this type, a method of using a high-temperature gas generated by burning explosive is widely adopted, but gas cooling for avoiding damage to a bag and harmful components in the gas are used. It is necessary to use a gas filter to remove the. As a filter for this purpose, a laminate of a plurality of stainless steel wire nets, a metal foam, a metal baffle plate, or the like is used.

However, since the conventional gas filters as described above have insufficient elasticity, a gap is generated when they are housed in the casing, and high-temperature gas easily short-passes. Even if the gas filter itself is non-homogeneous and short-circuiting of high-temperature gas is likely to occur, it takes a lot of trouble to load it in the casing,
When the wire diameter of the wire mesh is increased in order to prevent melting damage, the elasticity is lowered and the workability is also lowered, which leaves many problems.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and facilitates filling into a casing, does not easily form a gap between the casing and a thick metal wire rod. The present invention has been completed in order to provide a gas filter which is easy to melt and is less likely to melt, and which is homogeneous in itself, and in which there is no risk of short-pass of high-temperature gas, and a method for manufacturing the same.

(Means for Solving the Problems) The above-mentioned problems are an annular thick wire body made of an assembly of metal wires having a relatively large wire diameter bent into a plane wave shape or a three-dimensional wave shape, and the same as a plane wave shape or a three-dimensional wave shape. This can be solved by a gas filter characterized in that an annular thin wire body made of an aggregate of processed metal wire rods having a relatively small wire diameter is laminated and integrated with a thick annular wire body as a gas inflow side.

Further, the above-mentioned problem is that a metal wire having a relatively large wire diameter and a metal wire having a relatively small wire diameter are bent into a plane wave shape or a three-dimensional wave shape, respectively, and an annular thick wire body and an annular thin wire body are formed by assembling these. Can be formed individually or simultaneously and can be solved by a method of manufacturing a gas filter, characterized in that the annular thick wire body is laminated and integrated with the annular thin wire body on the gas inflow side.

Hereinafter, these inventions will be described in more detail with reference to Examples.

(Example) In the following examples, a metal wire (1) made of a heat-resistant metal such as stainless steel and having a relatively small wire diameter of 0.1 to 0.3 mm, and a wire made of the same material having a wire diameter of 0.4. ~ 0.8 mm
The metal wire (2) having a relatively large wire diameter is used. In the present specification, “relatively” means a comparison between the metal wire rod (1) and the metal wire rod (2), and does not mean an absolute wire diameter.

Example 1 In this example, the metal wire rods (1) and (2) as described above are used.
First, as shown in FIG. 1, each of the gears first passes between a pair of first gears (3), (3) that mesh with each other, and is bent in one direction at a constant pitch in a wavy shape (planar waveform). .
The first gear (3) is preferably a spur gear whose module is 4.0 to 1.0. Next, the metal wire rods (1) and (2) pass between the pair of second gears (5) and (5) meshing with each other through the guide (4). When entering the second gear (5), the metal wire rods (1) and (2) are naturally twisted so that the bending surface of the first gear (3) is parallel to the tooth surface of the second gear (5). When passing through the second gears (5) and (5), unevenness (three-dimensional waveform) bent in a three-dimensional wave shape in different directions with respect to this bending surface is formed. The second gear (5) is a spur gear whose module is 2.0 to 0.5, and by changing the modules of the first gear (3) and the second gear (5) in this way, they differ in different directions. It is possible to obtain the metal wire rods (1) and (2) that are bent in a wave shape at a pitch. First to second module (5) module M2
The ratio of the module M1 of the gear (3) is preferably M1 / M2 = 1.5-2.5. In this embodiment, the bending pitch is 5 to 10 mm and the wave height is 3 to 6 mm. In order to avoid breakage of the metal wire rods (1) and (2) in the bending process, the tension of the metal wire rods (1) and (2) should be the same as the diameters of the first gear (3) and the second gear (5). Keep it constant. The metal wire rods (1) and (2) bent under the above-mentioned conditions are the most suitable as the material of the gas filter. In addition, in the embodiment, the bending processing is performed in a three-dimensional wave shape, but the metal wire rods (1) and (2) may be bent in a plane wave shape in one plane.

The metal wire rods (1) and (2) thus bent into a three-dimensional wave shape or a plane wave shape are laminated to have a certain thickness, for example, by band-to-roll compression (6) and (7). It is said that Next, the aggregates (6) and (7) of the metal wire rods (1) and (2) are wound into a ring,
An annular thick wire (9) made of an assembly of metal wires (2) having a relatively large wire diameter and an annular thin wire (8) made of an assembly of metal wires (1) having a relatively small wire diameter are manufactured. . In this case, a thick metal wire (2) is disposed on the high temperature gas inflow side to prevent melting loss, and a thin metal wire (1) is subsequently disposed to improve the filtration performance. In the present invention, a gas filter having a plurality of layers is obtained by integrally laminating such an annular thick wire body (9) and an annular thin wire body (8), but in the present embodiment, both of them are provided in two stages. After being stacked on top of each other, the metal fastening wire rod (10) is integrally fastened to improve shape retention. Metal wire rods (1), (2) also as fastening wire rods (10) for this purpose
A bent product can be used in the same manner as, but is not necessarily limited to this. Further, depending on the purpose of use, they may be laminated in a sandwich form.

The annular thick wire body (9) and the annular thin wire body (8) thus fastened together are the annular upper mold (11) as shown in FIG.
First consisting of core type (12), outer type (13), and protruding type (14)
It is housed in the mold (15) and compression molded. At this time,
The annular thick wire body (9) and the annular thin wire body (8) are connected to each other by a fastening wire (1
It is easy to store in the mold (15) because it is fastened by 0) and the shape retention is improved, but as shown in the figure, apply an annular elastic ring (16) made of urethane resin or the like to the upper surface. If the upper die (11) is used for compression molding, the metal wire rods forming the annular thick wire body (9) and the annular thin wire body (8) will stick out from the gaps between the molds and damage the mold, or a defective molding product. Can be prevented from occurring. The bulk specific gravity after compression molding is preferably 1.0 to 3.0.

Depending on the shape of the desired gas filter, it may be possible to complete the product as it is by one compression molding, but in the case of this embodiment, as shown in FIG. 4, the upper mold (11) and the core mold (12) are further used. ,
Second compression molding is performed by the second mold (19) including the outer mold (17) and the protruding mold (18). In this case as well, the annular elastic ring (16) made of urethane resin or the like can be used, and thus the intended annular gas filter F having a multi-layered tip is obtained.

In the present embodiment, the annular thick wire body (9) and the annular thin wire body (8) are integrated in two stages, upper and lower, but when the gas inflow is in the radial direction, they are integrated in the inner and outer two layers. Further, the fastening with the fastening wire (10) before compression molding can be omitted, and further, the compression molding can be omitted only by fastening.

(Embodiment 2) In this embodiment, as shown in FIG. 5, a metal wire rod (1) or (2) bent into a three-dimensional wave shape or a plane wave shape is wound around a roller (20), so that FIG. The annular thin wire body (8) and the annular thick wire body (9), which are the aggregates (6) and (7) of the metal wire rods (1) and (2), are manufactured. In this case, by continuously winding the metal wire rods (1) and (2), the annular thin wire body (8) and the annular thick wire body (9) are wound inside and outside 2
The annular thick wire body (9) and the annular thin wire body (8), which are individually wound, may be integrated into two layers in the upper and lower layers or in the inner and outer layers by a fastening wire rod (10). . After that, the target multi-layered annular gas filter F can be obtained by the same steps as in Example 1.

(Example 3) Besides, as in Example 1, a band-shaped annular thick wire body (9) made of an aggregate of metal wire rods (2) is molded, and the metal wire rod (1) is formed from the outside as in Example 2. Can be wound to form an annular thin wire body (8), which can be integrated into two inner and outer layers. In the case of Examples 2 and 3, as in the case of Example 1, fastening with the fastening wire rod (10) before compression molding can be omitted, or compression molding can be omitted by only fastening. Needless to say, the annular thick wire (9) is used as the gas inflow side also in the second and third embodiments.

FIG. 7 shows an example of use in which the gas filter F of the present invention is incorporated in a gas generator for an automobile air bag. In the figure, (21) is a casing, and the gas filter F of the present invention is loaded outside the partition (22) inside thereof. The ignition chamber (23) is provided with an igniter (24) and an igniter (24) which is easily combusted, and when ignited, for example, sodium azide (Na ₂ N) in the explosive chamber (25) is provided. ) Explosively burns to generate a large amount of high-temperature gas (nitrogen gas) of, for example, 1000 to 1300 ° C.
While passing through the portion of the annular thick wire body (9) and the portion of the annular thin wire body (8) of the gas filter F via the gas inlet port (26) of 2), harmful components in the gas (for example, burns are caused). Removal of the alkali metal oxides) and cooling of the hot gas. Then, the appropriately cooled gas is supplied to a gas utilization side such as an airbag. In such a case, the metal wire rods (1) and (2) need to withstand a high temperature of about 1000 to 1300 ° C.

As described above, since the gas filter F of the present invention has the annular thick wire body (9) on the gas inflow side, it does not melt even if it comes into contact with a high temperature gas, and is cooled when passing through the annular thick wire body (9). The generated gas is further cooled while passing through the annular thin wire (8), and the harmful components are surely removed.

(Effects of the Invention) As described above, the gas filter of the first invention is composed of an assembly of metal wire rods that are bent into a plane wave shape or a three-dimensional wave shape. The structure is homogeneous and it is difficult for gas short path paths to be formed therein. Moreover, since this gas filter has an appropriate elasticity, it can be easily loaded into the casing, and no gap is formed between the gas filter and the casing. Further, this gas filter is an annular thick wire body made of an assembly of metal wires having a relatively large wire diameter, and an annular thin wire body made of an assembly of metal wires having a relatively small wire diameter as the gas inflow side of the annular thick wire body, Since they are laminated and integrated in the vertical direction or the inner and outer directions, reliable cooling and filtration performance can be exhibited without melting loss due to high temperature gas.

Further, according to the method of manufacturing the gas filter of the second invention, the gas filter having the above-mentioned excellent characteristics can be manufactured easily and efficiently.

As described above, the present invention is a gas filter that solves the conventional problems and a method for manufacturing the same, and thus can be used as, for example, a gas filter or a spring material used in a gas generator for an automobile airbag, etc. The areas that contribute to the development of industry are extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bending process of a metal wire rod according to the first embodiment, and FIG. 2 is a perspective view showing a state in which an annular thick wire body and an annular thin wire body are fastened by a fastening wire rod, FIG. 3, FIG. Four
FIG. 5 is a sectional view showing a compression molding process, FIG. 5 is a perspective view showing a bending process of a metal wire rod according to the second embodiment, and FIG. 6 is a state in which an annular thick wire body and an annular thin wire body are fastened with a fastening wire rod. FIG. 7 is a sectional view showing a usage state of the gas filter of the present invention. (1): Metal wire having a relatively small wire diameter, (2): Metal wire having a relatively large wire diameter, (5), (6): Aggregate, (8):
Ring thin wire, (9): Ring thick wire.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B64D 25/00 8816-3D

Claims (2)

[Claims] 1. An annular thick wire body (9) made of an assembly (6) of metal wires (2) having a relatively large wire diameter bent into a plane wave shape or a three-dimensional wave shape, and also bent into a plane wave shape or a three-dimensional wave shape. Processed metal wire with a relatively small wire diameter (1)
5. A gas filter, characterized in that an annular thin wire body (8) composed of the assembly (5) of (1) and an annular thick wire body (9) are laminated and integrated on the gas inflow side. 2. A circular thick wire body obtained by bending a metal wire material (2) having a relatively large wire diameter and a metal wire material (1) having a relatively small wire diameter into a plane wave shape or a three-dimensional wave shape and assembling them. (9) and the annular thin wire body (8) are formed individually or simultaneously, and the annular thick wire body (9) is laminated and integrated with the annular thin wire body (8) on the gas inflow side. Production method.