CN115671912A - Filtering device of automobile safety airbag gas generator and preparation method - Google Patents
Filtering device of automobile safety airbag gas generator and preparation method Download PDFInfo
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- CN115671912A CN115671912A CN202211246895.8A CN202211246895A CN115671912A CN 115671912 A CN115671912 A CN 115671912A CN 202211246895 A CN202211246895 A CN 202211246895A CN 115671912 A CN115671912 A CN 115671912A
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Abstract
The invention discloses a filtering device of an automobile safety airbag gas generator and a preparation method thereof, wherein the filtering device of the automobile safety airbag gas generator comprises an inner layer, an outer layer and a filtering layer, the inner layer comprises an inner ring plate and a sealing plate, the sealing plate is arranged at one end of the inner ring plate and is used for sealing one end of a cavity of the inner ring plate, at least one first through hole is arranged at the upper part or the lower part of the inner ring plate, the outer layer comprises an outer ring plate, and at least one second through hole is arranged at one side of the outer ring plate, which is far away from the first through hole. The three-layer structure of the inner layer, the outer layer and the filter layer has an airflow guiding function, high-temperature and high-pressure gas generated by combustion of gas producing chemicals can reach the exhaust holes through almost the whole filter screen, the gas generated by the gas generator is enabled to be cleaner and lower in temperature, the inner layer has the function of integrating the lower cover, the filter screen and peripheral parts of the filter screen are integrated into a whole, and the sealing performance is excellent.
Description
Technical Field
The invention relates to the technical field of automobile safety airbag gas generators, in particular to a filtering device of an automobile safety airbag gas generator and a preparation method thereof.
Background
Automobile air bag gas generators fall into four categories: cold gas type gas generator, pyrotechnic gas generator, mixed gas generator and new gas generator for mixing hydrogen and oxygen. The gas source of the pyrotechnic gas generator is mainly a pyrotechnic material, generally called gas production agent.
The existing pyrotechnic gas generator structure mostly adopts a circular ring-shaped filter screen. When the gas generator acts, high-temperature and high-pressure gas generated by the combustion of the gas production medicine can pass through the filter screen, the combustion residues of the gas production medicine are intercepted by the filter screen, and heat generated by the combustion of the gas production medicine is absorbed by the filter screen, so that the lower pure gas with lower temperature is discharged by the gas generator. However, the upper end and the lower end of the annular filter screen are not aerated to be utilized because the gas passing path is usually the shortcut direction from the gas generation chamber to the exhaust hole of the generator shell.
In addition, the instant of gas production medicine burning, the shell of the generator that the generator shell internal pressure rises sharply and arouses expands, this expansion can lead to originally can produce the clearance suddenly between the filter screen that closely cooperates with the generator shell, some high temperature high pressure gas contains the residue and can follow this clearance, do not include through the filter screen and directly reach the exhaust hole of generator, in order to stop this kind of condition generator, two thin wall stamping parts still can be assembled at the filter screen both ends of every generator, call upper cover and lower cover respectively, the effect of these two parts is when the gas generator shell warp, thin wall's upper and lower lid also can warp together, the straight flange part of upper and lower cover hugs closely the inner wall of filter screen can block the residue along the upper and lower casing of generator and spill.
Disclosure of Invention
The invention aims to provide a filtering device of an automobile safety airbag gas generator and a preparation method thereof, wherein a three-layer structure of an inner layer, an outer layer and a filtering layer has an airflow guiding function, high-temperature and high-pressure gas generated by combustion of a gas generating agent can reach an exhaust hole through almost the whole filtering net, the gas generated by the gas generator is ensured to be cleaner and lower in temperature, the inner layer has the function of integrating a lower cover, the filtering net and peripheral parts of the filtering net are integrated into a whole, and the sealing performance is more excellent.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an automobile air bag gas generator filter equipment, includes inlayer, skin and fill in the filter layer between inlayer and the skin, the inlayer includes interior crown plate and shrouding, the shrouding set up in the one end of interior crown plate is used for the one end of the cavity of airtight interior crown plate, the upper portion or the lower part of interior crown plate are equipped with at least one first through-hole, the skin includes outer crown plate, the one side of keeping away from first through-hole on the outer crown plate is equipped with at least one second through-hole.
As a further optimization, the first through hole is arranged on one side, close to the sealing plate, of the inner ring plate; the second through hole is formed in one side, far away from the sealing plate, of the outer ring plate.
As a further optimization, the closing plate is arranged at the lower end of the inner annular plate.
As a further optimization, the outer layer further comprises an annular cover plate, the annular cover plate is arranged on the outer ring plate, and the annular cover plate is abutted against the inner ring plate.
As a further optimization, the annular cover plate is arranged at the opposite side of the closing plate, and the annular cover plate does not close the cavity.
As a further optimization, the inner ring plate and the closing plate, and the outer ring plate and the annular cover plate are all of an integrally formed structure.
As a further optimization, the filter layer is made of a metal material which is filled between the inner layer and the outer layer and has the functions of ventilation and heat absorption.
As a further optimization, the filter layer is a metal wire mesh which is wrapped on the inner annular plate and has one or more layers of structures.
As a further optimization, the filter layer is a plurality of metal balls filled between the inner layer and the outer layer.
As a further optimization, the filtering layer is a plurality of spiral bent pipes with holes, and the spiral bent pipes are filled between the inner layer and the outer layer.
Of course, besides the filtering layer selected from the metal wire mesh, the metal ball and the perforated spiral bent pipe, a plurality of layers of wound metal punching plates and the like can be selected, and the filtering layer is not limited in form.
The invention also provides a preparation method of the filtering device of the gas generator of the automobile safety airbag, which comprises the following steps:
s1) processing an inner layer: forming a sealing plate at one end of the inner ring plate to form a seal, and forming a first through hole on the side wall of the inner ring plate close to one side of the sealing plate;
s2) processing an outer layer: an annular cover plate is formed at one end of the outer annular plate, a middle hole is formed in the middle of the annular cover plate, and a second through hole is formed in the side wall, close to one side of the annular cover plate, of the outer annular plate;
s3) processing a filter layer: the filter layer is formed by winding metal wires, or pressing knitted nets, or extruding round pipes after holes are formed;
s4) wrapping the filtering layer on the outer side of the inner layer, sleeving the outer layer on the outer side of the filtering layer, and fixing the annular cover plate on the outer layer on one end, far away from the sealing plate, of the inner annular plate.
As a further optimization, the filter layer in S2 is a winding net, and the forming method comprises the following steps:
s31) taking the inner layer as a mandrel, and winding the metal wire on one or more layers of the outer side of the mandrel to form a winding net;
s32) fixing the tail end of the wound wire.
As a further optimization, the metal wires in S31 are wound layer by layer from inside to outside, the metal wires in each layer have the same pitch angle α, and the pitch angles α of the metal wires in two adjacent layers are the same and opposite in direction.
Compared with the prior art, the invention has the following beneficial effects:
1. the three-layer structure of the inner layer, the outer layer and the filter layer has an airflow guiding function, so that high-temperature and high-pressure gas generated by combustion of gas producing chemicals of the gas generator can reach the exhaust holes through almost the whole filter screen, and the whole annular filter layer is fully utilized for residue filtering and temperature cooling, so that the gas generated by the gas generator is ensured to be cleaner and lower in temperature, and meanwhile, the three-layer structure is more favorable for the integrity of an air bag and peripheral parts of the safety airbag;
2. the integral structure of the filter screen is changed, the filtering efficiency of the filter screen is improved, and the possibility of assembly space of the gas production medicine is improved by reducing the thickness of the whole filter screen;
3. the inner layer comprises an inner ring plate and a sealing plate for sealing the lower end of the cavity of the inner ring plate, the lower cover is integrated, the filter screen and peripheral parts of the filter screen are combined into a whole, and the sealing performance is more excellent.
Drawings
Fig. 1 is a structural view of a filter device of an airbag inflator for a vehicle according to the present invention.
Fig. 2 is a structural view of an inner layer of a filter device of an airbag inflator for a vehicle according to the present invention.
Fig. 3 is a structural view of another embodiment of the filter device of the gas generator for an automobile airbag according to the present invention.
Fig. 4 is a sectional view of a filter layer of a filter device of an airbag for an automobile of the present invention, which is a wound web.
Fig. 5 is a sectional view of a filter layer of a filter device of an air bag for an automobile air bag according to the present invention, which is a metal pellet.
FIG. 6 is a sectional view of a filter layer of the filter device of the airbag inflator for an automobile according to the present invention, which is a spiral bent pipe having a hole.
Fig. 7 is a schematic structural view of a wire-wound inner layer of a method of manufacturing a filter device for an airbag inflator for an automobile according to the present invention.
Fig. 8 is a schematic structural view of a multi-layer wire-wound inner layer of the method for manufacturing a filter device of an air bag for an automobile air bag according to the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 2, a filtering device for an airbag inflator of an automobile comprises an inner layer 1, an outer layer 2, and a filter layer 3 filled between the inner layer 1 and the outer layer 2, wherein the inner layer 1 comprises an inner ring plate 11 and a sealing plate 12, the sealing plate 12 is disposed at one end of the inner ring plate 11 and is used for sealing one end of a cavity 100 of the inner ring plate 11, at least one first through hole 10 is disposed at an upper portion or a lower portion of the inner ring plate 11, the outer layer 2 comprises an outer ring plate 21, and at least one second through hole 20 is disposed at one side of the outer ring plate 21, which is far away from the first through hole 10.
In this embodiment, it is preferable that the sealing plate 12 is provided at the lower end of the inner ring plate 11, the first through hole 10 is provided on the side of the inner ring plate 11 closer to the sealing plate 12, and the second through hole 20 is provided on the side of the outer ring plate 21 farther from the sealing plate 12.
The inner layer and the outer layer can be selected from round pipes, such as seamed steel pipes, seamless steel pipes and the like, the wall thickness of the round pipes is 0.4-1.6mm, and the holes of the round pipes can be processed by die stamping, laser cutting, mechanical processing and the like. The inner and outer tubes may be of the same wall thickness or the inner tube may be slightly thicker than the outer tube because the inner tube is subjected to a higher pressure during the initial period of combustion.
Furthermore, the inner layer is a cup-shaped stretching piece, the outer layer is a stretching part with a part of open pore at the bottom, and the functions of the lower cover and the filtering layer of the common gas generator are combined into a whole. When the gas generator is used, the bottom sealing performance is better, a lower cover in the gas generator can be omitted, one-step assembly procedures are omitted, and the possibility of neglected loading is absolutely avoided. Of course, the inner layer and the outer layer can be any combination of round pipes and stamping parts, but the exhaust holes of the inner layer and the outer layer are necessarily located at two opposite ends in the vertical direction, and only then can the gas be ensured to pass through the whole filter layer along the Z direction, and the filtering efficiency of the filter layer can be ensured to be improved.
As shown in fig. 3, in another embodiment of the present invention, the outer layer 2 further includes an annular cover plate 22, and the annular cover plate 22 is disposed on the upper end of the outer ring plate 21 under the condition that the sealing plate 12 is disposed on the lower end of the inner ring plate 11, and the annular cover plate 22 abuts against the inner ring plate 11 for sealing the upper end of the region between the inner ring plate 11 and the outer ring plate 21, but the annular cover plate 22 does not seal the cavity 100 of the inner ring plate 11, and preferably, the inner ring plate 11 and the sealing plate 12, and the outer ring plate 21 and the annular cover plate 22 are integrally formed.
The filter layer is any metal material which can be placed between the inner layer and the outer layer and is used for absorbing the combustion heat of the gas producing medicine, and the filter layer specifically comprises:
in one embodiment of the present invention, as shown in fig. 4, the filter layer 3 is a wire mesh 31 wrapped around the inner annular plate 11 in one or more layers, and the wire mesh 31 may be a wire-wound mesh, or a preformed knitted or woven mesh made of wire. No matter the needle net, the woven net or the winding net is made of metal materials, and the metal materials can be iron wires, steel wires and copper wires, and also can be iron wires plated with zinc, silver, copper and the like and have better heat conductivity. The cross section of the silk can be round, oval, triangular, quadrangular or even any shape, the diameter of the silk is within 0.2-1.2mm, and the matching is selected according to different gas producing medicine types and filtering requirements.
As shown in fig. 5, in an embodiment of the present invention, the filter layer 3 is a plurality of metal beads 32, such as steel beads, iron beads or copper beads, filled between the inner layer 1 and the outer layer 2, and the outer diameters of the metal beads may be uniform or graded by several beads with different outer diameters.
In one embodiment of the present invention, as shown in fig. 6, the filter layer 3 is a plurality of spiral bends 33 with holes filled between the inner layer 1 and the outer layer 2, for example, after a rotary punching hole is arranged on a round pipe to cut a notch, the whole cut round pipe is extruded into a serpentine threaded pipe, and the serpentine threaded pipe is cut according to the height of the filter screen.
In addition, in order to ensure the stability of the filter layer, the outer layer can be sleeved on the filter layer and then rounded edge rolling closing in is carried out.
The invention also provides a preparation method of the filtering device of the gas generator of the automobile safety airbag, which comprises the following steps:
s1) processing the inner layer 1: forming a sealing plate 12 at one end of an inner ring plate 11 to form one end seal, and forming a first through hole 10 on the side wall of the inner ring plate 11 close to one side of the sealing plate 12;
s2) processing the outer layer 2: forming an annular cover plate 22 at one end of the outer annular plate 21, wherein a middle hole is formed in the middle of the annular cover plate 22, the cavity 100 defined by the inner annular plate 11 is not sealed, and a second through hole 20 is formed in the side wall, close to one side of the annular cover plate 22, of the outer annular plate 21;
s3) processing the filter layer 3: the filter layer 3 can be formed by winding metal wires, or by pressing a knitted net, or by extruding a round pipe after holes are formed;
and S4) wrapping the filter layer 3 outside the inner layer 1, sleeving the outer layer 2 outside the filter layer 3, and fixing the annular cover plate 22 on the outer layer 1 on one end, far away from the sealing plate 12, of the inner annular plate 11.
In addition, when the filtering layer is made of metal balls, the inner layer 1 and the outer layer 2 can be fixed and formed firstly, then the metal balls are inverted, and the metal balls are placed in a space between the inner layer and the outer support.
As shown in fig. 7, when the filter layer 3 in S2 is a wound web, the forming method thereof is:
s31) taking the inner layer 1 as a mandrel and actually taking the inner ring plate 11 as a wound body, and winding the metal wires on one or more layers of the outer side of the mandrel to form a winding net;
s32) fixing the tail end of the wound wire.
As shown in fig. 8, the metal wires in S31 are wound layer by layer from inside to outside, the metal wires in each layer have the same pitch angle α, the pitch angles α of the metal wires in two adjacent layers are the same, and the directions are opposite, specifically: the first wire 311 of the outer layer is wound in reverse direction with the second wire 312 of the inner layer.
In the invention, when the metal wire mesh is selected from a needle mesh and a woven mesh, the metal wire mesh is required to be pressed into a specified constraint shape by a forming die and then assembled with the inner layer and the outer layer for use. The invention further recommends a winding process, and the winding process is used for the method and the device, and has the advantages that the method can directly wind the inner layer without a special mandrel, and after the winding is finished, the tail end of the metal wire is simply welded and fixed and then directly sleeved on the outer layer, so that the very reliable shaping and fixing can be realized, and sintering and shaping are not needed; winding net to ensure better stability between the wires, the wires can be wound layer by layer from inside to outside, using exactly the same pitch angle α (angle between the wire and the inner tube axis) for each layer of wires, but in opposite directions.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (11)
1. The filtering device is characterized by comprising an inner layer, an outer layer and a filtering layer filled between the inner layer and the outer layer, wherein the inner layer comprises an inner ring plate and a sealing plate, the sealing plate is arranged at one end of the inner ring plate and used for sealing one end of a cavity of the inner ring plate, at least one first through hole is formed in the upper portion or the lower portion of the inner ring plate, the outer layer comprises an outer ring plate, and at least one second through hole is formed in one side, far away from the first through hole, of the outer ring plate.
2. The automotive air bag inflator filter assembly of claim 1 wherein the first through hole is provided in the inner ring plate on a side thereof adjacent to the closure plate; the second through hole is formed in one side, far away from the sealing plate, of the outer ring plate.
3. The filter assembly as recited in claim 1, wherein said sealing plate is disposed at a lower end of said inner annular plate.
4. The automotive airbag inflator filter of claim 1, 2 or 3, wherein the outer layer further comprises an annular cover plate disposed on the outer ring plate, the annular cover plate abutting the inner ring plate.
5. The automotive airbag gas generator filter assembly of claim 4 wherein the annular cover plates are disposed on opposite sides of the closure plate and do not enclose the cavity.
6. The automotive airbag inflator filter of claim 4 wherein the inner ring plate and the closure plate and the outer ring plate and the annular cover plate are of integrally formed construction.
7. The filter device of claim 1, wherein the filter layer is made of a metal material having a heat absorbing and ventilating function and filled between the inner layer and the outer layer.
8. The filter device for an airbag inflator in accordance with claim 1 or 7, wherein the filter layer is one or more layers of wire mesh wrapped around the inner annular plate, or the filter layer is a plurality of metal beads filled between the inner layer and the outer layer, or the filter layer is a plurality of spiral bends with holes filled between the inner layer and the outer layer.
9. A preparation method of a filtering device of an automobile safety airbag gas generator is characterized by comprising the following steps:
s1) processing an inner layer: forming a sealing plate at one end of the inner ring plate to form a seal, and forming a first through hole on the side wall of the inner ring plate close to one side of the sealing plate;
s2) processing an outer layer: an annular cover plate is formed at one end of the outer annular plate, a middle hole is formed in the middle of the annular cover plate, and a second through hole is formed in the side wall, close to one side of the annular cover plate, of the outer annular plate;
s3) processing a filter layer: the filter layer is formed by winding metal wires, or pressing knitted nets, or extruding round pipes after holes are formed;
s4) wrapping the filtering layer on the outer side of the inner layer, sleeving the outer layer on the outer side of the filtering layer, and fixing the annular cover plate on the outer layer on one end, far away from the sealing plate, of the inner annular plate.
10. The manufacturing method of the filtering device for an air generator of an automobile airbag according to claim 9, wherein the filtering layer in S2 is a wound web formed by a method comprising:
s31) taking the inner layer as a mandrel, and winding the metal wire on one or more layers of the outer side of the mandrel to form a winding net;
s32) fixing the tail end of the wound wire.
11. The method for manufacturing a filtering device of an air generator of an automobile air bag according to claim 10, wherein the metal wires in S31 are wound layer by layer from inside to outside, the metal wires in each layer have the same pitch angle α, and the metal wires in two adjacent layers have the same pitch angle α and opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211246895.8A CN115671912A (en) | 2022-10-12 | 2022-10-12 | Filtering device of automobile safety airbag gas generator and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211246895.8A CN115671912A (en) | 2022-10-12 | 2022-10-12 | Filtering device of automobile safety airbag gas generator and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115671912A true CN115671912A (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211246895.8A Pending CN115671912A (en) | 2022-10-12 | 2022-10-12 | Filtering device of automobile safety airbag gas generator and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115671912A (en) |
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2022
- 2022-10-12 CN CN202211246895.8A patent/CN115671912A/en active Pending
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