CN105984420A - Gas generator and assembling method thereof - Google Patents
Gas generator and assembling method thereof Download PDFInfo
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- CN105984420A CN105984420A CN201510044858.2A CN201510044858A CN105984420A CN 105984420 A CN105984420 A CN 105984420A CN 201510044858 A CN201510044858 A CN 201510044858A CN 105984420 A CN105984420 A CN 105984420A
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- tubular shell
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Abstract
The invention provides a gas generator and an assembling method thereof. The lower end of a cylindrical shell is provided with an exhaust end cover. The cylindrical shell is equipped with a gas throttling component, a tubular shell, a cup-shaped ignition shell, and an ignition base, all of which are arranged from the bottom to the top in order. The exhaust end cover of the cup-shaped structure is provided with a plurality of air exhaust openings. A large flange is arranged at the opening end of the gas throttling component of the cup-shaped structure. A small flange is arranged close to the enclosed end. Multiple communicating holes are formed in the circumferential wall of the gas throttling component. Multiple communicating holes are formed in the circumferential wall of the tubular shell with a large upper section, a small lower part and a cylindrical structure. A gas generation agent is loaded in the tubular shell. A flame spreading agent is loaded in the cup-shaped ignition shell. The bottom is provided with a flame spreading port communicating with an inner cavity of the tubular shell. The ignition base is arranged on the upper end of the cup-shaped ignition shell in a press fitting mode.The gas generator is low in internal pressure, and good in gas flowability and effectively ensure stable combustion of the gas generation agent.
Description
Technical field
The present invention relates to a kind of gas generator and assembly method thereof, it is installed on the restraint device in vehicle, such as air bag system etc., and particularly relates to a kind of gas generator used in side impact airbag system, for being launched in occupant side by air bag.
Background technology
For the gas generator of vehicle side collision airbag deployment, due to the restriction in installation site space, it is usually designed to dye.
The draw ratio of the type gas generator is more than 1, during gas-forming agent in lighting combustor, actually only can be by normal ignition near the gas-forming agent passing fire agent, produce a large amount of steam, local pressure is caused to raise, discharge if this portion gas can not normally flow out combustor, result in whole combustion chamber pressure and drastically raise, thus disturb the properly functioning of gas generator.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art to provide the gas generator and assembly method thereof that a kind of internal pressure is low, gas fluidity is good.
The technical scheme is that tubular shell lower end is provided with exhaust end cover；Tubular shell inner chamber is sequentially arranged with gas band stream unit, tubular shell, cup-shaped igniting housing, igniting pedestal from the bottom to top.
The cup-shaped structure of described exhaust end cover, its open at one end is connected with tubular shell lower end；Described exhaust end cover is provided with multiple air vent.
The described cup-shaped structure of gas throttling parts, its opening is relative with exhaust end cover opening；Described gas throttling component openings end is provided with big flange, is provided with little flange at blind end；At described big flange, external diameter is equal to the tubular shell internal diameter at corresponding place；At described little flange, external diameter is less than the tubular shell internal diameter at corresponding place；On gas throttling parts, big circumferential wall between flange and little flange is provided with multiple intercommunicating pore；Intercommunicating pore quantity preferably 59.
Described tubular shell is the step tubular structure that the big hypomere of outer circle wall epimere is little, and small stair section lower end is installed at the gas little flange of band stream unit；Tubular shell big step section external diameter is less than the tubular shell internal diameter at corresponding place；Tubular shell circumferential wall is provided with multiple through hole；Described tubular shell is built with gas-forming agent；Described through-hole diameter arranges and should ensure that gas-forming agent cannot pass through.
Described cup-shaped igniting housing bottom is provided with the seam blocked mutually for step section upper end big with tubular shell；Cup-shaped igniting enclosure interior is provided with biography fire agent, and bottom is provided with the biography burner with tubular shell inner space；This biography burner guarantees that passing fire agent cannot pass through dimensionally, or is closed this biography burner by sealing paper tinsel, blocks biography fire agent and passes.
Cup-shaped igniting housing upper end is pressed with igniting pedestal；It is fixed with ignitron in described igniting pedestal.
Air vent on described exhaust end cover is arranged in exhaust end cover circumferential wall.
Air vent on described exhaust end cover is arranged at bottom exhaust end cover.
Described exhaust end cover opening is provided with flange, and flange outer is connected with tubular shell lower end.
Described tubular shell is the step cylinder-like structure that the big hypomere of epimere is little.
Described tubular shell is the step rib tubular structure that the big hypomere of epimere is little.
The length of described tubular shell small stair section and the length ratio of big step section are 1:1 ~ 2.
Air vent on described exhaust end cover is closed to prevent gas-forming agent from making moist by band.
The assembly method of aforesaid gas generator comprises the following steps:
1) opening of exhaust end cover is pressed fit into tubular shell lower ending opening, and be welded and fixed；
2) tubular shell lower end is installed at the gas little flange of band stream unit；
3) rap tubular shell to be packed in tubular shell by the gas-forming agent of scheduled volume simultaneously；Then housing bottom seam of being lighted a fire by cup-shaped presses fit into the big step section upper end of tubular shell；
4) tubular shell assembled, gas throttling parts, cup-shaped igniting housing are pressed fit in tubular shell towards the direction of exhaust end cover at upper, gas throttling parts according to cup-shaped igniting housing, and make gas throttling component openings end be close to exhaust end cover opening；
5) the biography fire agent of scheduled volume is packed in cup-shaped igniting housing, then the igniting pedestal being fixed with ignitron is pressed fit in tubular shell；
6) by the reducing clamping together with the igniting pedestal small stair portion being fixed with ignitron of tubular shell upper end.
nullCompared with prior art，It is an advantage of the current invention that: tubular shell is prone to by gas throttling parts、Cup-shaped igniting housing、Tubular shell is fixed，And the axis of tubular shell is prone to and the axis of gas throttling parts、The axis of cup-shaped igniting housing、The axis of tubular shell unanimously arranges，So placement of tubular shell makes to be formed between the inner peripheral wall of tubular shell and tubular shell outer wall the gas channel gap that the little hypomere of epimere amplifies greatly and step by step，Also form the annular airflow space of one fixed width and the degree of depth on gas throttling parts between big circumferential wall and cylinder housing inner peripheral wall between flange and little flange simultaneously，The high temperature and high pressure gas gradually produced inside when being all conducive to gas generator to work runs through the through hole of tubular shell，Enter and amplify gas channel gap step by step，Through annular airflow space buffer，Discharged by air vent again，Advantageously reduce gas generator internal pressure，Ensure that gas-forming agent stably burns.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of tubular shell embodiment 1.
Fig. 3 is the structural representation of tubular shell embodiment 2.
Detailed description of the invention
In Fig. 1, one end of tubular shell arranges and is passed, by cup-shaped igniting housing filling, the igniting chamber that fire agent is limited, and the other end arranges the exhaust end cover with gas outlet.In the remaining space of tubular shell, circumferential wall there is the tubular shell of intercommunicating pore, and the combustor that gas throttling parts and cup-shaped igniting housing are limited and fill for gas-forming agent.
Igniting chamber 10 is provided in the igniter of tubular shell 30 upper end 30a.Igniting chamber 10 is made up of the fiery agent 80 of the biography of known ignitron, graininess or lamellar or the combination of gas-forming agent and cup-shaped igniting housing 12.
Ignitron flange is fixed in igniting pedestal 11, and the combination loading passing fire agent 80 or gas-forming agent of graininess or lamellar is in cup-shaped igniting housing 12.
Combustor 70 is formed by cup-shaped igniting housing bottom 12a, tubular shell inwall 20d gentle body segment stream unit 40 blind end 40a.
Combustor 70 loads lamellar gas-forming agent 60.Gas-forming agent 60 can have favourable ignition performance and favourable deflagrate performance.The embodiment of such gas-forming agent can select the round sheet gas-forming agent of diameter 3mm and thickness 1.5mm.
Exhaust end cover 50 is arranged on the lower end 30b of tubular shell, and it has flange at opening 50a and has multiple air vent 50b in outer circumferential walls 50c, and air vent can be closed by band 100.Such embodiment can select 4 diameter 2mm manholes, and exhaust end cover can use punching press or machine to add or forging and molding, but is not limited only to above 3 kinds of forming modes.
The opening 40d of gas throttling parts 40 is towards exhaust end cover 50, and is adjacent to the open end 50a of exhaust end cover.
Gas throttling parts 40 have blind end 40a, little flange 40b and big flange 40c, and in the circumferential wall between little flange 40b and big flange 40c, have the annular groove 40e of one fixed width and the degree of depth, there is on its annular groove 40e multiple intercommunicating pore 40f, such embodiment can be arranged to the groove that 2mm is deep and 4mm is wide, and it arranges the intercommunicating pore of 9 diameter 3mm.
Tubular shell 20 is placed in tubular shell 30, and surface configuration multiple intercommunicating pore 20e(can be arranged to the 8 equidistant intercommunicating pores of row, and often row is evenly arranged the intercommunicating pore of 8 2.5mm).The big step section 20a circumferential inner wall of tubular shell 20 is fixed by contacting with the seam extruding of cup-shaped igniting housing bottom 12a, and its small stair section 20b circumferential inner wall is fixed by contacting with the extruding of the seam of gas throttling parts 40 blind end 40a.
Cup-shaped igniting housing 12, tubular shell 20 gentle body segment stream unit 40 are contacted by cup-shaped igniting housing outer circle wall 12b and tubular shell inner peripheral wall surface 30c extruding and axially and radially fix, and such cup-shaped igniting housing 12 axis, tubular shell 20 axis, gas throttling parts 40 axis are consistent with tubular shell 30 axis.
Tubular shell 20 maximum outside diameter is less than tubular shell 30 internal diameter.Additionally tubular shell 20 20c external diameter in a segment length distance of small stair section 20b side is less than 20e external diameter in a segment length distance of big step section 20a side, the relatively small outer diameter section length that example is implemented can select the 1/3 of total length, relatively small outer diameter section can use machine to add or flatten technique, but is not limited to above 2 kinds of forming modes.So formed between tubular shell 20 and tubular shell 30 and amplify stepped annular gap 30d step by step, and form blind end 90 between outer circle wall and the tubular shell 30 inner peripheral wall 30c between gas throttling parts little flange 40b and big flange 40c.
The assembly method of gas generator shown in Fig. 1 is as follows:
The exhaust end cover 50 with gas outlet is pressed fit into the lower end 30b opening part of tubular shell 30, and by being welded and fixed.
Tubular shell small stair section 20b lower end is installed in the seam of gas throttling parts 40 blind end 40a.
Then, while rap tubular shell 20, while the gas-forming agent 60 of scheduled volume is packed in tubular shell 20.
The seam of housing bottom 12a of being lighted a fire by cup-shaped presses fit into the end of big step section 20a of tubular shell, to form combustor 70.
Then, the tubular shell 20 assembled, gas throttling parts 40 and cup-shaped igniting housing 12 is pressed fit in tubular shell 30 towards the direction of exhaust end cover 50 at upper, gas throttling parts 40 according to cup-shaped igniting housing 12.Now, the opening 40d of gas throttling parts 40 is close to the opening 50a of exhaust end cover, and the outer circle wall 12b of cup-shaped igniting housing contacts with the inner peripheral wall 30c surface extruding of tubular shell and fixes.
Then, the combination passing fire agent 80 or gas-forming agent of scheduled volume is packed in cup-shaped igniting housing 12, in then the pedestal 11 being fixed with ignitron is pressed fit into cup-shaped igniting housing 12, forms igniting chamber 10.
The work process of gas generator shown in Fig. 1 is as follows:
When in combustor 70, gas-forming agent 60 burns due to the effect of igniting chamber 10, instantaneous generation high-temperature gas, high-temperature gas enters in the 30d of gap by tubular shell intercommunicating pore 20e, due to the instantaneous reduction of spatial volume, high-temperature gas flow velocity increases, and temperature raises, and internal pressure sharply increases.Owing to gap 30d is in amplifying trapezium structure step by step, rapid heated gas slightly slows down at interstitial volume increase position flow velocity, pressure slightly reduces.
When high-temperature gas reaches gas throttling parts 40 position, owing to having larger space in annular groove 40e position, High Temperature Gas is known from experience normal through intercommunicating pore 40f on gas throttling parts, enters exhaust end cover 50, enters airbag finally by the air vent 50c on exhaust end cover.
If gap 30d is not in amplifying trapezium structure step by step, but the structure that front and back width is consistent, i.e. identical before and after body 20 external diameter, so along be positioned at the gas-forming agent 60 that combustor 70 holds rearward burn time, high-temperature gas in the 30d of gap fills with whole space, and the high-temperature gas of follow-up generation will force internal pressure drastically to raise.Additionally, if gas throttling parts 40 do not arrange annular groove 40e, i.e. gap between gas throttling parts 40, tubular shell 20 and tubular shell 30 is identical, then along with high temperature, gases at high pressure are constantly assembled at blind end 90, the internal pressure of this position also can drastically raise.In that way it is possible to cause malformation at the opening 50a of tubular shell small stair section 20b, the circumferential wall of gas throttling parts 40 and cylinder lower end 30b and exhaust end cover 50, even rupture.
In Fig. 2, the tubular shell 20 step cylinder-like structure that big hypomere is little in epimere, the length of small stair section 20b is 1:2 with the length ratio of big step section 20a.
In Fig. 3, tubular shell 20 step-like structure that big hypomere is little in epimere, the biggest step section 20a is cylinder-like structure, and small stair section is rib tubular structure.The length of small stair section 20b is 1:2 with the length ratio of big step section 20a.
Owing to the gas generator of the present invention has such as structure above, so it is low to have internal pressure, gas fluidity is good, prevents gas and residue from blocking the feature of intercommunicating pore.
Above-described embodiment is all to illustrate and be not restriction.The technical scope of the present invention is determined by claims, and comprises record and all changes within the range being equal to claims.
Claims (10)
1. a gas generator, it is characterised in that: tubular shell (30) lower end is provided with exhaust end cover (50)；Tubular shell (30) inner chamber is sequentially arranged with gas band stream unit (40), tubular shell (20), cup-shaped igniting housing (12), igniting pedestal (11) from the bottom to top；
Described exhaust end cover (50) cup-shaped structure, its open at one end is connected with tubular shell (30) lower end；Described exhaust end cover (50) is provided with multiple air vent (50b)；
The cup-shaped structure of described gas throttling parts (40), its opening is relative with exhaust end cover (50) opening；Described gas throttling parts (40) opening is provided with big flange, is provided with little flange at blind end；At described big flange, external diameter is equal to tubular shell (30) internal diameter at corresponding place；At described little flange, external diameter is less than tubular shell (30) internal diameter at corresponding place；The upper circumferential wall between big flange and little flange of gas throttling parts (40) is provided with multiple intercommunicating pore (40f)；
Described tubular shell (20) is the step tubular structure that the big hypomere of outer circle wall epimere is little, and small stair section lower end is installed at gas band stream unit (40) little flange；The big step section external diameter of tubular shell (20) is less than tubular shell (30) internal diameter at corresponding place；Tubular shell (20) circumferential wall is provided with multiple through hole (20e)；Described tubular shell (20) is built with gas-forming agent (60)；
Described cup-shaped igniting housing (12) bottom is provided with the seam blocked mutually for step section upper end big with tubular shell (20)；Cup-shaped igniting housing (12) is internal is provided with biography fire agent (80), and bottom is provided with the biography burner with tubular shell (20) inner space；
Cup-shaped igniting housing (12) upper end is pressed with igniting pedestal (11).
Gas generator the most according to claim 1, it is characterised in that: the air vent (50b) on described exhaust end cover (50) is arranged in exhaust end cover circumferential wall.
Gas generator the most according to claim 1, it is characterised in that: the air vent (50b) on described exhaust end cover (50) is arranged at bottom exhaust end cover.
Gas generator the most according to claim 1, it is characterised in that: described exhaust end cover (50) opening is provided with flange, and flange outer is connected with tubular shell (30) lower end.
Gas generator the most according to claim 1, it is characterised in that: described tubular shell (20) the step cylinder-like structure that big hypomere is little in epimere.
Gas generator the most according to claim 1, it is characterised in that: described tubular shell (20) the step rib tubular structure that big hypomere is little in epimere.
Gas generator the most according to claim 1, it is characterised in that: the length of described tubular shell (20) small stair section is 1:1 ~ 2 with the length ratio of big step section.
8. according to the gas generator described in claim 1,2 or 3, it is characterised in that: the air vent (50b) on described exhaust end cover (50) is closed to prevent gas-forming agent from making moist by band.
Gas generator the most according to claim 1, it is characterised in that: described igniting pedestal (11) outer circle wall is the big step-like structure of the little hypomere of epimere；Close up in described tubular shell (30) upper end and igniting pedestal small stair portion blocks mutually with fixed ignition pedestal (11).
10. the assembly method of gas generator described in a claim 1, it is characterised in that: comprise the following steps:
1) opening of exhaust end cover (50) is pressed fit into tubular shell (30) lower ending opening, and be welded and fixed；
2) tubular shell (20) lower end is installed at gas band stream unit (40) little flange；
3) rap tubular shell (20) to be packed into by the gas-forming agent (60) of scheduled volume in tubular shell (20) simultaneously；Then housing (12) bottom seam of being lighted a fire by cup-shaped presses fit into the big step section upper end of tubular shell (20)；
4) tubular shell (20) assembled, gas throttling parts (40), cup-shaped igniting housing (12) are pressed fit in tubular shell (30) towards the direction of exhaust end cover (50) at upper, gas throttling parts (40) according to cup-shaped igniting housing (12), and make gas throttling parts (40) opening be close to exhaust end cover (50) opening；
5) biography fire agent (80) of scheduled volume is packed in cup-shaped igniting housing (12), then the igniting pedestal (11) being fixed with ignitron is pressed fit in tubular shell (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044858.2A CN105984420B (en) | 2015-01-29 | 2015-01-29 | gas generators and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044858.2A CN105984420B (en) | 2015-01-29 | 2015-01-29 | gas generators and assembling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105984420A true CN105984420A (en) | 2016-10-05 |
| CN105984420B CN105984420B (en) | 2020-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510044858.2A Active CN105984420B (en) | 2015-01-29 | 2015-01-29 | gas generators and assembling method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09226508A (en) * | 1996-02-26 | 1997-09-02 | Nippon Kayaku Co Ltd | Gas generator for air bag |
| US6412816B1 (en) * | 1999-01-27 | 2002-07-02 | Contec Chemieanlagen Gmbh | Gas generator |
| US20080078486A1 (en) * | 2006-09-30 | 2008-04-03 | Khandhadia Paresh S | Gas generating system and composition |
| US20100109295A1 (en) * | 2005-06-02 | 2010-05-06 | Mccormick David M | Gas generating system |
| CN102753401A (en) * | 2010-02-03 | 2012-10-24 | 株式会社大赛璐 | Gas generator and assembling method of the same |
| CN204452352U (en) * | 2015-01-29 | 2015-07-08 | 湖北航天化学技术研究所 | A kind of gas generator |
-
2015
- 2015-01-29 CN CN201510044858.2A patent/CN105984420B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09226508A (en) * | 1996-02-26 | 1997-09-02 | Nippon Kayaku Co Ltd | Gas generator for air bag |
| US6412816B1 (en) * | 1999-01-27 | 2002-07-02 | Contec Chemieanlagen Gmbh | Gas generator |
| US20100109295A1 (en) * | 2005-06-02 | 2010-05-06 | Mccormick David M | Gas generating system |
| US20080078486A1 (en) * | 2006-09-30 | 2008-04-03 | Khandhadia Paresh S | Gas generating system and composition |
| CN102753401A (en) * | 2010-02-03 | 2012-10-24 | 株式会社大赛璐 | Gas generator and assembling method of the same |
| CN204452352U (en) * | 2015-01-29 | 2015-07-08 | 湖北航天化学技术研究所 | A kind of gas generator |
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| Publication number | Publication date |
|---|---|
| CN105984420B (en) | 2020-01-31 |
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