CN113525287A - Novel injection molding type DAB gas generator - Google Patents
Novel injection molding type DAB gas generator Download PDFInfo
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- CN113525287A CN113525287A CN202110751825.7A CN202110751825A CN113525287A CN 113525287 A CN113525287 A CN 113525287A CN 202110751825 A CN202110751825 A CN 202110751825A CN 113525287 A CN113525287 A CN 113525287A
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- lower cover
- cup
- ignition
- injection molding
- gas generator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
The invention discloses a novel injection molding type DAB gas generator, and aims to provide a novel injection molding type DAB gas generator which is integrally formed through injection molding and has good sealing performance. The utility model provides a novel DAB gas generator of injection moulding formula, includes the epitheca and the lower cover of flange form that become the tube-shape, and epitheca and lower cover constitute the reaction chamber, and the fixed ignition subassembly and the ignition subassembly that has cup jointed injection moulding in lower cover middle part run through the lower cover, have set gradually the medicine cup subassembly outside by interior in the reaction chamber, produce gas medicine and filter screen, and the medicine cup subassembly cup joints with the ignition subassembly, and medicine cup subassembly and epitheca fixed connection, produce gas medicine and arrange the medicine cup subassembly outside in, and the both ends of filter screen are connected with epitheca and lower cover respectively. The invention has the beneficial effects that: the parts are integrally formed by injection molding, so that the number of parts is reduced, the cost is reduced, the assembly is convenient, and the sealing performance is good; the injection molding body is prevented from rotating, so that the sealing performance is enhanced; the filtering effect is improved; the upper shell and the lower cover are connected in a sealing mode through laser welding, and connection quality and sealing performance are guaranteed.
Description
Technical Field
The invention relates to the technical field of gas generators, in particular to a novel injection molding type DAB gas generator.
Background
The gas generator is mainly used in an air bag in an automobile safety system, and when a human body is impacted, the gas generator generates gas at a moment and fills the air bag so as to protect the body of a driver and prevent the body from being seriously impacted.
In the prior art, the lower cover and the ignition component on the gas generator need to be machined respectively and then assembled, so that the lower cover part is poor in sealing performance and low in overall strength.
Disclosure of Invention
The invention provides a novel injection molding type DAB gas generator which is integrally formed by injection molding and has good sealing property, aiming at overcoming the defects that the lower cover and an ignition component are respectively processed and assembled and the sealing property is poor in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a novel injection moulding formula DAB gas generator, includes the epitheca and the lower cover of flange form that become the tube-shape, epitheca and lower cover constitute the reaction chamber, the fixed ignition module and the ignition module that has cup jointed injection moulding in lower cover middle part run through the lower cover, the reaction chamber has set gradually medicine cup subassembly, product gas medicine and filter screen outside by interior, the medicine cup subassembly cup joints with the ignition module, medicine cup subassembly and epitheca fixed connection, product gas medicine arranges the medicine cup subassembly outside in, the both ends of filter screen are connected with epitheca and lower cover respectively.
The upper shell is cylindrical, the lower cover is flange-shaped, and the upper shell and the lower cover are combined to form a reaction cavity. The ignition assembly is sleeved in the middle of the lower cover and is integrally formed by injection molding, the number of parts is reduced, and meanwhile, the cost can be reduced and the assembly is convenient. The reaction cavity is internally provided with a medicine cup component, a gas producing medicine and a filter screen which are arranged from inside to outside in sequence. The medicine cup subassembly cup joints with ignition assembly, and the gas production medicine is arranged in the medicine cup subassembly outside, and ignition assembly arouses the medicine cup subassembly and accomplishes the ignition to produce the activation of gas production medicine, produce gas. The medicine cup component is fixedly connected with the upper shell, so that the installation stability of the medicine cup component is ensured. The both ends of filter screen are connected with epitheca and lower cover respectively, guarantee that the filter screen is not broken away when the point explodes, ensure the filter effect.
Preferably, the lower cover middle part is provided with mounting groove, mounting groove's opening direction is the same with upper shell opening direction, mounting groove bottom center is provided with the hole of stepping down, ignition module and the fixed cup joint of hole of stepping down. The mounting groove provides a mounting position for the ignition assembly, and the ignition assembly penetrates through the abdicating hole to be connected with the lower cover, so that the mounting is reliable.
Preferably, the inner side surface of the bottom surface of the mounting groove is provided with a plurality of anti-rotation grooves, each anti-rotation groove is arc-shaped, and the outer side surface of each mounting groove is provided with a sealing groove which is annular. The anti-rotation groove is arranged on the outer side of the lower cover and is arc-shaped, the sealing groove is arranged on the inner side of the lower cover and is annular, and the anti-rotation groove can play a role in strengthening the lower cover.
As preferred, ignition module includes the injection molding body, short circuit presss from both sides and the ignition tube, the injection molding body shape is the tubulose, the injection molding body both ends are provided with short circuit clamp mounting groove and ignition tube mounting groove respectively, the reaction chamber outside is arranged in to the short circuit clamp mounting groove, the reaction chamber is inboard arranged in to the ignition tube mounting groove, the short circuit presss from both sides and the ignition tube shape is the cylinder, short circuit clamp mounting groove cup joints with the short circuit clamp, the ignition tube mounting groove cup joints with the ignition tube, the ignition tube is provided with the ignition wire, the ignition wire passes the injection molding body in proper order and the short circuit presss from both sides. The one end that the reaction chamber inboard was arranged in to the injection molding body is provided with the ignition tube mounting groove, the ignition tube cup joints in the ignition tube mounting groove, the one end that the reaction chamber outside was arranged in to the injection molding body is provided with the short circuit and presss from both sides the mounting groove, the short circuit presss from both sides the cover and connects in the short circuit, the ignition wire of ignition tube setting passes from the injection molding body and short circuit clamp in proper order, the injection molding body is integrative injection moulding, fix the ignition tube together with the lower cover through the form of moulding plastics, reduce spare part quantity, and the cost is reduced, can make the assembly simple simultaneously, the operation of being convenient for and the leakproofness are good.
As preferred, injection molding body lateral surface middle part is provided with the annular groove of stepping down, it is provided with a plurality of lugs of preventing changeing to step down inslot wall below, it is the lug of arcuation to prevent changeing the lug, prevent changeing the lug and prevent changeing the recess phase-match, it is provided with sealed piece to step down inslot wall top, sealed piece is ring shape, sealed piece and seal groove phase-match, step down the tank bottom surface and step down the contact of downthehole inside wall. The anti-rotation lug is embedded into the anti-rotation groove, so that the injection molding body is prevented from rotating, and the sealing performance is enhanced; the sealing block is annular and is embedded into the sealing groove, so that the sealing property is enhanced; the bottom surface of the abdicating groove is in contact with the side wall of the abdicating hole and is tightly connected with the abdicating hole, so that the sealing performance is enhanced.
Preferably, the medicine cup assembly comprises a medicine cup and gunpowder, the medicine cup is cylindrical, the gunpowder is arranged inside the medicine cup, a plurality of through holes are formed in the side wall of the medicine cup and evenly arranged around the side wall of the medicine cup, the open end of the medicine cup is fixedly sleeved with the outer side wall of the injection molding body, and the bottom of the medicine cup is connected with the inner bottom surface of the upper shell. The open end of the medicine cup is sleeved with the injection molding body, the bottom of the medicine cup is connected with the inner bottom surface of the upper shell, the connection mode is stable, and the medicine cup and the injection molding body are prevented from generating relative displacement under the vibration condition.
Preferably, a spring is arranged in the medicine cup, one end of the spring is fixedly connected with the injection molding body, and one end of the ignition tube, which extends out of the ignition tube mounting groove, is arranged in the spring. The spring plays a role in shock absorption.
Preferably, the filter screen comprises a plurality of individual layer filter screens stack, the filter screen is connected one end with the lower cover and is provided with the flange limit, flange limit lateral surface is provided with the fillet, flange limit bottom surface and lower cover internal surface connection, the fillet that the flange limit set up and lower cover internal surface fillet phase-match. The filter screens are overlapped by a plurality of single-layer filter screens, so that the filtering effect can be improved; a flange edge is arranged on one side of the filter screen connected with the lower cover, so that the gap between the upper shell and the lower cover is fully utilized, and the sealing effect is improved; meanwhile, the filter screen is ensured not to be scattered when in ignition, the integrity of the filter screen is kept, and the filtering effect is improved.
Preferably, the outer diameter of the upper shell is the same as the inner diameter of the lower cover, the upper shell is sleeved with the lower cover, and the end face of the opening end of the upper shell is in contact with the upper surface of the flange of the filter screen. The upper shell and the lower cover are connected in a sealing mode through laser welding, and connection quality and sealing performance are guaranteed.
Preferably, the surface of the side of the upper shell is provided with an air outlet, and the air outlet is connected with a rupture disk in a sealing manner. The vent hole that the epitheca set up can be with the gas outgoing that produces the gas medicine, enter into the gasbag, the rupture disk plays sealed effect when exploding for the point.
The invention has the beneficial effects that: the parts are integrally formed by injection molding, so that the number of parts is reduced, the cost is reduced, the assembly is convenient, and the sealing performance is good; the injection molding body is prevented from rotating, so that the sealing performance is enhanced; the filter screens are overlapped by a plurality of single-layer filter screens, and meanwhile, the filter screens cannot be scattered during ignition, so that the integrity of the filter screens is maintained, and the filtering effect is improved; the upper shell and the lower cover are connected in a sealing mode through laser welding, and connection quality and sealing performance are guaranteed.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a first perspective view of the lower cover of the present invention;
FIG. 4 is a second perspective view of the lower cover of the present invention;
FIG. 5 is a partial sectional view of the first embodiment of the present invention;
fig. 6 is a partial sectional view of the second embodiment of the present invention.
In the drawings, there is shown in the drawings,
1. the ignition device comprises an upper shell, a lower cover, a 3 ignition assembly, a 4 medicine cup assembly, a 5 gas producing medicine, a 6 filter screen, a 10 air outlet hole, a 11 rupture membrane, a 20 mounting groove, a 21 abdication hole, a 22 anti-rotation groove, a 23 sealing groove, a 30 injection molding body, a 31 short circuit clamp, a 32 ignition tube, a 40 medicine cup, a 41 explosive powder, a 42 spring, a 60 single-layer filter screen, a 61 flange edge, a 300 short circuit clamp mounting groove, a 301 ignition tube mounting groove, a 302 abdication groove, a 303 anti-rotation lug, a 304 sealing block, a 320 ignition wire and a 400 through hole.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1, as shown in fig. 1, a novel DAB gas generator of injection molding type includes a cylindrical upper case 1 and a flange-shaped lower cover 2. The upper shell 1 and the lower cover 2 form a reaction chamber. The middle part of the lower cover 2 is fixedly sleeved with an ignition component 3 which is formed by injection molding, and the ignition component 3 penetrates through the lower cover 2. The reaction cavity is internally and externally provided with a medicine cup component 4, a gas producing medicine 5 and a filter screen 6 in sequence. The medicine cup component 4 is sleeved with the ignition component 3. The medicine cup component 4 is fixedly connected with the upper shell 1. The gas producing medicine 5 is arranged outside the medicine cup component 4. Two ends of the filter screen 6 are respectively connected with the upper shell 1 and the lower cover 2.
As shown in fig. 2, 3 and 4, the lower cover 2 is provided with a mounting groove 20 at the middle portion. The opening direction of the mounting groove 20 is the same as the opening direction of the upper case 1. The center of the bottom of the mounting groove 20 is provided with a yielding hole 21. The ignition component 3 is fixedly sleeved with the abdicating hole 21. The inner side of the bottom surface of the mounting groove 20 is provided with a plurality of anti-rotation grooves 22. The rotation-preventing groove 22 is arc-shaped. The outer side surface of the mounting groove 20 is provided with a sealing groove 23. The sealing groove 23 is circular.
As shown in fig. 2, the ignition assembly 3 includes an injection molded body 30, a shorting clip 31, and an ignition tube 32. The injection molded body 30 is tubular in shape. The injection molding body 30 is provided at both ends thereof with a short clip installation groove 300 and an ignition tube installation groove 301, respectively. The short clip mounting groove 300 is disposed outside the reaction chamber. The squib mounting groove 301 is disposed inside the reaction chamber. The shorting clip 31 and the ignition tube 32 are both cylindrical in shape. The short clip mounting groove 300 is sleeved with the short clip 31. The squib mounting groove 301 is fitted with the squib 32. The squib 32 is provided with a squib wire 320. The ignition wire 320 passes through the injection molded body 30 and the shorting clip 31 in sequence. The middle part of the outer side surface of the injection molding body 30 is provided with an annular abdicating groove 302. A plurality of anti-rotation bumps 303 are arranged below the inner wall of the abdicating groove 302. The rotation preventing projection 303 is an arc-shaped projection. The rotation preventing projections 303 are matched with the rotation preventing grooves 22. A sealing block 304 is arranged above the inner wall of the abdicating groove 302. The sealing block 304 is annular. Seal block 304 mates with seal groove 23. The bottom surface of the receding groove 302 contacts with the inner side wall of the receding hole 21.
As shown in fig. 5, the cup assembly 4 includes a cup 40 and a charge 41. The medicine cup 40 is cylindrical. The explosive 41 is placed inside the cup 40. The side wall of the medicine cup 40 is provided with a plurality of through holes 400, and the through holes 400 are uniformly arranged around the side wall of the medicine cup 40. The open end of the medicine cup 40 is fixedly sleeved with the outer side wall of the injection molding body 30. The bottom of the medicine cup 40 is connected with the inner bottom surface of the upper shell 1. A spring 42 is provided in the cup 40. One end of the spring 42 is fixedly connected with the injection-molded body 30. The end of the squib 32 protruding out of the squib mounting groove 301 is disposed inside the spring 42.
As shown in fig. 6, the screen 6 is formed by stacking a plurality of single screens 60. One end of the filter screen 6 connected with the lower cover 2 is provided with a flange 61. The outer side surface of the flange edge 61 is provided with a round angle. The bottom surface of the flange 61 is connected to the inner surface of the lower cover 2. The round angle of the flange edge 61 is matched with the round angle of the inner surface of the lower cover 2. The outer diameter of the upper shell 1 is the same as the inner diameter of the lower cover 2. The upper shell 1 is sleeved with the lower cover 2. The end surface of the open end of the upper case 1 is in contact with the upper surface of the flange 61 of the strainer 6. The upper case 1 is provided at a side surface thereof with an air outlet hole 10. The air outlet 10 is hermetically connected with a rupture disk 11.
The working principle of the invention is as follows: as shown in fig. 1 to 6, the upper case 1 and the lower cover 2 constitute a reaction chamber. The middle part of the lower cover 2 is provided with a yielding hole 21, and the plastic injection body 30 is sleeved in the yielding hole 21. The injection molding body 30 is sleeved with a short circuit clip 31 and an ignition tube 32 at two ends respectively, the short circuit clip 31 is arranged on the outer side of the lower cover 2, and the ignition tube 32 is arranged on the inner side of the lower cover 2. The medicine cup 40 is sleeved with one end of the injection body 30 connected with the fire tube 32, and the ignition tube 32 is arranged in the medicine cup 40. The explosive cup 40 is internally provided with an explosive 41, and the explosive 41 completes ignition under the action of the ignition tube 32. The side of the medicine 40 cup is provided with a plurality of through holes 400, the gas producing medicine 5 is activated by the flame generated by the gas producing agent 41, the gas producing medicine 5 releases high-temperature gas and flame, the pressure in the reaction cavity rises rapidly, when reaching a certain value, the rupture membrane 11 covered at the air outlet 10 on the upper shell 1 is ruptured, and the gas enters the safety airbag, thereby achieving the function of protecting the driver and the passenger. The gas is filtered by the filter screen 6 before the rupture disk 11 is broken, so that the impurities are prevented from entering the safety airbag to injure a driver and passengers.
Claims (10)
1. The utility model provides a novel injection moulding formula DAB gas generator, characterized by, including epitheca (1) and the lower cover (2) of flange form that becomes the tube-shape, epitheca (1) and lower cover (2) constitute the reaction chamber, the fixed cover in middle part of lower cover (2) has been cup jointed injection moulding's ignition subassembly (3) and has run through lower cover (2), medicine cup subassembly (4), produce gas medicine (5) and filter screen (6) have set gradually outside by interior in the reaction chamber, medicine cup subassembly (4) cup joint with ignition subassembly (3), medicine cup subassembly (4) and epitheca (1) fixed connection, produce gas medicine (5) and arrange medicine cup subassembly (4) the outside in, the both ends of filter screen (6) are connected with epitheca (1) and lower cover (2) respectively.
2. A novel DAB gas generator of injection moulding formula according to claim 1, characterized by, the lower cover (2) middle part is provided with mounting groove (20), the opening direction of mounting groove (20) is the same with upper shell (1) opening direction, mounting groove (20) bottom center is provided with the hole of stepping down (21), ignition module (3) and the fixed cup joint of hole of stepping down (21).
3. A novel DAB gas generator of injection molding according to claim 2, characterized in that the bottom surface medial surface of mounting groove (20) is provided with a plurality of anti-rotation grooves (22), anti-rotation grooves (22) are circular-arc, the lateral surface of mounting groove (20) is provided with seal groove (23), seal groove (23) is ring-shaped.
4. A novel DAB gas generator of injection molding type according to claim 3, the ignition component (3) comprises an injection molding body (30), a short circuit clamp (31) and an ignition tube (32), the injection molding body (30) is tubular, two ends of the injection molding body (30) are respectively provided with a short circuit clip installation groove (300) and an ignition tube installation groove (301), the short circuit clip mounting groove (300) is arranged on the outer side of the reaction cavity, the ignition tube mounting groove (301) is arranged on the inner side of the reaction cavity, the short circuit clip (31) and the ignition tube (32) are both cylindrical in shape, the short circuit clip mounting groove (300) is sleeved with the short circuit clip (31), the ignition tube mounting groove (301) is sleeved with an ignition tube (32), the ignition tube (32) is provided with an ignition wire (320), the ignition wire (320) penetrates through the injection molding body (30) and the short circuit clamp (31) in sequence.
5. The novel injection-molded DAB gas generator of claim 4, characterized in that the middle of the outer side surface of the injection-molded body (30) is provided with an annular abdicating groove (302), a plurality of anti-rotation bumps (303) are arranged below the inner wall of the abdicating groove (302), the anti-rotation bumps (303) are arc-shaped bumps, the anti-rotation bumps (303) are matched with the anti-rotation grooves (22), a sealing block (304) is arranged above the inner wall of the abdicating groove (302), the sealing block (304) is circular, the sealing block (304) is matched with the sealing groove (23), and the bottom surface of the abdicating groove (302) is in contact with the inner side wall of the abdicating hole (21).
6. A novel injection-molded DAB gas generator as claimed in claim 4 or 5, characterized in that the cup assembly (4) comprises a cup (40) and a gunpowder (41), the cup (40) is cylindrical, the gunpowder (41) is placed inside the cup (40), the sidewall of the cup (40) is provided with a plurality of through holes (400), the through holes (400) are uniformly arranged around the sidewall of the cup (40), the open end of the cup (40) is fixedly sleeved with the outer sidewall of the injection-molded body (30), and the bottom of the cup (40) is connected with the inner bottom surface of the upper shell (1).
7. A novel DAB gas generator of injection moulding type according to claim 6, characterized in that a spring (42) is arranged in the medicine cup (40), one end of the spring (42) is fixedly connected with the injection moulding body (30), and one end of the ignition tube (32) extending out of the ignition tube mounting groove (301) is arranged in the spring (42).
8. A novel DAB gas generator of formula of moulding plastics according to claim 1, characterized by, filter screen (6) comprises a plurality of individual layer filter screens (60) stack, filter screen (6) and lower cover (2) are connected one end and are provided with flange limit (61), flange limit (61) lateral surface is provided with the fillet, flange limit (61) bottom surface and lower cover (2) internal surface connection, the fillet that flange limit (61) set up and lower cover (2) internal surface fillet phase-match.
9. A novel DAB gas generator of injection moulding type according to claim 8, characterized in that the outer diameter of the upper shell (1) is the same as the inner diameter of the lower cover (2), the upper shell (1) is sleeved with the lower cover (2), and the end face of the open end of the upper shell (1) is in surface contact with the upper surface of the flange (61) of the filter screen (6).
10. A novel DAB gas generator as injection moulding according to claim 1 or 2 or 9, characterized in that the upper shell (1) is provided with a vent hole (10) on its side surface, the vent hole (10) being sealingly connected with a bursting disc (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110751825.7A CN113525287A (en) | 2021-07-02 | 2021-07-02 | Novel injection molding type DAB gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110751825.7A CN113525287A (en) | 2021-07-02 | 2021-07-02 | Novel injection molding type DAB gas generator |
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| Publication Number | Publication Date |
|---|---|
| CN113525287A true CN113525287A (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110751825.7A Pending CN113525287A (en) | 2021-07-02 | 2021-07-02 | Novel injection molding type DAB gas generator |
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| CN (1) | CN113525287A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008183939A (en) * | 2007-01-26 | 2008-08-14 | Nippon Kayaku Co Ltd | Gas generator |
| CN102171071A (en) * | 2008-09-30 | 2011-08-31 | Trw空气气袋系统股份有限公司 | Gas generator, method for the production thereof and module having a gas generator |
| JP2013166496A (en) * | 2012-02-16 | 2013-08-29 | Nippon Kayaku Co Ltd | Gas generator |
| CN103347744A (en) * | 2011-01-07 | 2013-10-09 | 日本化药株式会社 | Gas generator |
| CN112172734A (en) * | 2020-09-25 | 2021-01-05 | 均胜汽车安全系统(湖州)有限公司 | Gas generator for small injection molding type safety air bag |
| CN213167980U (en) * | 2020-08-13 | 2021-05-11 | 均胜汽车安全系统(湖州)有限公司 | Novel integral type gas generator moulds plastics |
-
2021
- 2021-07-02 CN CN202110751825.7A patent/CN113525287A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008183939A (en) * | 2007-01-26 | 2008-08-14 | Nippon Kayaku Co Ltd | Gas generator |
| CN102171071A (en) * | 2008-09-30 | 2011-08-31 | Trw空气气袋系统股份有限公司 | Gas generator, method for the production thereof and module having a gas generator |
| CN103347744A (en) * | 2011-01-07 | 2013-10-09 | 日本化药株式会社 | Gas generator |
| JP2013166496A (en) * | 2012-02-16 | 2013-08-29 | Nippon Kayaku Co Ltd | Gas generator |
| CN213167980U (en) * | 2020-08-13 | 2021-05-11 | 均胜汽车安全系统(湖州)有限公司 | Novel integral type gas generator moulds plastics |
| CN112172734A (en) * | 2020-09-25 | 2021-01-05 | 均胜汽车安全系统(湖州)有限公司 | Gas generator for small injection molding type safety air bag |
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