CN204452352U - A kind of gas generator - Google Patents
A kind of gas generator Download PDFInfo
- Publication number
- CN204452352U CN204452352U CN201520062751.6U CN201520062751U CN204452352U CN 204452352 U CN204452352 U CN 204452352U CN 201520062751 U CN201520062751 U CN 201520062751U CN 204452352 U CN204452352 U CN 204452352U
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- China
- Prior art keywords
- tubular shell
- gas
- cup
- end cover
- igniting
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Abstract
The utility model provides a kind of gas generator, and there is exhaust end cover tubular shell lower end; Tubular shell inner chamber is equipped with gas throttling parts, tubular shell, cup-shaped igniting housing, igniting pedestal from the bottom to top successively; The exhaust end cover of cup-shaped structure there is multiple exhausr port; Cup-shaped formation gases throttle part open end has large flange, has little flange near closed end place; Gas throttling parts circle wall there is multiple intercommunicating pore.Tubular shell is the step tubular structure that the large hypomere of outer circle wall epimere is little, and tubular shell circle wall has multiple through hole; Tubular shell is built with gas generant; Cup-shaped igniting enclosure interior has the fiery agent of biography, and the biography burner with tubular shell inner space is arranged at bottom.Cup-shaped igniting housing upper end is pressed with igniting pedestal.The utility model internal pressure is low, and gas fluidity is good, effectively ensures gas generant smooth combustion.
Description
Technical field
The utility model relates to a kind of gas generator, and 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 space, installation site, be usually designed to dye.
The length-diameter ratio of the type gas generator is greater than 1, during gas generant in ignition combustion room, in fact only having can by normal ignition near passing the gas generant of fiery agent, produce a large amount of hot gas, local pressure is caused to raise, discharge if this portion gas normally can not flow out combustion chamber, just cause whole combustion chamber pressure sharply to raise, thus the normal operation of interference gas producer.
Summary of the invention
Goal of the invention of the present utility model is to overcome the above-mentioned deficiency of prior art and provides the gas generator that a kind of internal pressure is low, gas fluidity is good.
The technical solution of the utility model is: tubular shell lower end is provided with exhaust end cover; Tubular shell inner chamber is equipped with gas throttling parts, tubular shell, cup-shaped igniting housing, igniting pedestal from the bottom to top successively.
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 exhausr port.
The cup-shaped structure of described gas throttling parts, its open end is relative with exhaust end cover open end; Described gas throttling component openings end is provided with large flange, is provided with little flange near closed end place; Described large flange place external diameter equals the tubular shell internal diameter with its corresponding position; Described little flange place external diameter is less than the tubular shell internal diameter with its corresponding position; On gas throttling parts, large circle wall between flange and little flange is provided with multiple intercommunicating pore; Intercommunicating pore quantity preferably 5-9.
Described tubular shell is the step tubular structure that the large hypomere of outer circle wall epimere is little, and small stair section lower end is installed in the little flange place of gas throttling parts; Tubular shell large step section external diameter is less than the tubular shell internal diameter with its corresponding position; Tubular shell circle wall is provided with multiple through hole; Described tubular shell is built with gas generant; Described through-hole diameter is arranged should ensure that gas generant can not pass.
Described cup-shaped igniting housing bottom is provided with the seam for blocking mutually with tubular shell large step section upper end; Cup-shaped igniting enclosure interior is provided with and passes fiery agent, and bottom is provided with the biography burner with tubular shell inner space; This biography burner guarantees that passing fiery agent can not pass dimensionally, or closes this biography burner by sealed foil, blocks the fiery agent of biography and passes.
Cup-shaped igniting housing upper end is pressed with igniting pedestal; Described igniting pedestal internal fixtion has ignition tube.
Exhausr port on described exhaust end cover is arranged in exhaust end cover circle wall.
Exhausr port on described exhaust end cover is arranged at bottom exhaust end cover.
Described exhaust end cover open end is provided with flange, and flange outer is connected with tubular shell lower end.
Described tubular shell is the little step cylinder-like structure of the large hypomere of epimere.
Described tubular shell is the little step rib tubular structure of the large hypomere of epimere.
The length of described tubular shell small stair section and the length ratio of large step section are 1:1 ~ 2.
Exhausr port on described exhaust end cover is closed to prevent gas generant from making moist by sealing band.
The assembly method of aforesaid gas generator comprises the following steps:
1) open end 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 in the little flange place of gas throttling parts;
3) rap tubular shell is packed in tubular shell by the gas generant of scheduled volume simultaneously; Then housing bottom seam of being lighted a fire by cup-shaped presses fit into the large 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 open end;
5) agent of the biography of scheduled volume fire is packed in cup-shaped igniting housing, then the igniting pedestal being fixed with ignition tube is pressed fit in tubular shell;
6) reducing together with the igniting pedestal small stair portion being fixed with ignition tube of tubular shell upper end is clamped.
Compared with prior art, the utility model has the advantage of: tubular shell is easily through gas throttling parts, cup-shaped igniting housing, tubular shell is fixed, and the axis of tubular shell is easy to the axis with gas throttling parts, the axis of cup-shaped igniting housing, the axis of tubular shell unanimously arranges, the placement of such tubular shell makes to form the large gas channel gap of also amplifying step by step of the little hypomere of epimere between the inner peripheral wall of tubular shell and tubular shell outer wall, gas throttling parts are also formed the annular airflow space of one fixed width and the degree of depth between large circle wall between flange and little flange and cylindrical shell housing inner peripheral wall simultaneously, when being all conducive to gas generator work, the inner high temperature and high pressure gas produced gradually is rapidly by the through hole of tubular shell, enter and amplify gas channel gap step by step, through annular airflow space buffer, discharged by exhausr port again, be conducive to reducing gas generator internal pressure, ensure gas generant smooth combustion.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
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 is arranged loads by cup-shaped igniting housing the ignition chamber passing fiery agent and limit, and the other end arranges the exhaust end cover with air extractor duct.In the remaining space of tubular shell, be there is by circle wall the tubular shell of intercommunicating pore, and gas throttling parts and cup-shaped igniting housing institute limit and for gas generant filling combustion chamber.
Ignition chamber 10 is the ignition devices being arranged on tubular shell 30 upper end 30a.Ignition chamber 10 is made up of the biography fire agent 80 of known ignition tube, graininess or sheet or the combination of gas generant and cup-shaped housing 12 of lighting a fire.
Ignition tube flange is fixed in igniting pedestal 11, and the biography fire agent 80 of graininess or sheet or the combination loading of gas generant are in cup-shaped igniting housing 12.
Combustion chamber 70 is formed by cup-shaped igniting housing bottom 12a, tubular shell inwall 20d gentle body segment stream unit 40 closed end 40a.
Combustion chamber 70 loads sheet gas generant 60.Gas generant 60 can have favourable ignitability and favourable fast burn performance.The embodiment of such gas generant can select the round sheet gas generant 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 open end 50a and has multiple exhausr port 50b at outer circumferential walls 50c, and exhausr port is closed by sealing band 100.Such embodiment can select 4 diameter 2mm manholes, and exhaust end cover can adopt punching press or machine to add or forging and molding, but is not limited only to above 3 kinds of forming modes.
The open end 40d of gas throttling parts 40 towards exhaust end cover 50, and is adjacent to the open end 50a of exhaust end cover.
Gas throttling parts 40 have closed end 40a, little flange 40b and large flange 40c, and on little flange 40b and the circle wall greatly between flange 40c, have the annular groove 40e of one fixed width and the degree of depth, its annular groove 40e has multiple intercommunicating pore 40f, such embodiment can be arranged to the groove that 2mm is dark and 4mm is wide, the intercommunicating pore of layout 9 diameter 3mm on it.
Tubular shell 20 is placed in tubular shell 30, and surface arranges multiple intercommunicating pore 20e(can be arranged to the equidistant intercommunicating pore of 8 row, and often row is evenly arranged the intercommunicating pore of 8 2.5mm).The large step section 20a circumferential inner wall of tubular shell 20 is by extruding and contact with the light a fire seam of housing bottom 12a of cup-shaped and fix, and its small stair section 20b circumferential inner wall contacts by extruding with the seam of gas throttling parts 40 closed end 40a and fixes.
Cup-shaped igniting housing 12, the gentle body segment stream unit 40 of tubular shell 20 are extruded by cup-shaped igniting housing outer circle wall 12b and tubular shell inner peripheral wall surface 30c and to contact and axis and radial direction are fixed, and light a fire housing 12 axis, tubular shell 20 axis, gas throttling parts 40 axis of such cup-shaped is consistent with tubular shell 30 axis.
Tubular shell 20 maximum outside diameter is less than tubular shell 30 internal diameter.In addition tubular shell 20 small stair section 20b side one segment length distance on 20c external diameter be less than large step section 20a side one segment length distance on 20e external diameter, such embodiment can select 1/3 of total length compared with small outer diameter section length, comparatively small outer diameter section can adopt machine add or flatten technique, but inequality is limited to above 2 kinds of forming modes.Formed between such tubular shell 20 and tubular shell 30 and amplify stepped circular clearance 30d step by step, and form closed end 90 between outer circle wall between the little flange 40b of gas throttling parts and large flange 40c and tubular shell 30 inner peripheral wall 30c.
The assembly method of gas generator shown in Fig. 1 is as follows:
The exhaust end cover 50 with air extractor duct 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 closed end 40a.
Then, while rap tubular shell 20, while the gas generant 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 the large step section 20a of tubular shell, to form combustion chamber 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 open end 40d of gas throttling parts 40 is close to the open end 50a of exhaust end cover, and the outer circle wall 12b of cup-shaped igniting housing and the inner peripheral wall 30c surface of tubular shell extrude and contact and fix.
Then, the combination of the fire agent 80 of the biography of scheduled volume or gas generant is packed in cup-shaped igniting housing 12, then the pedestal 11 being fixed with ignition tube is pressed fit in cup-shaped igniting housing 12 and form ignition chamber 10.
The working process of gas generator shown in Fig. 1 is as follows:
When in combustion chamber 70, gas generant 60 burns due to the effect of ignition 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.Because 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 exhausr port 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, namely identical before and after body 20 external diameter, so along be positioned at gas generant 60 that combustion chamber 70 holds rearward burn time, high-temperature gas in the 30d of gap has been full of whole space, and the high-temperature gas of follow-up generation will force internal pressure sharply to raise.In addition, if gas throttling parts 40 do not arrange annular groove 40e, namely gas throttling parts 40, gap between tubular shell 20 with tubular shell 30 are identical, and so along with high temperature, high pressure gas are constantly assembled at closed end 90, the internal pressure of this position also can sharply raise.Like this, the circle wall of tubular shell small stair section 20b, gas throttling parts 40 and open end 50a place's structural distortion of cylindrical shell lower end 30b and exhaust end cover 50 may be caused, even break.
In Fig. 2, the step cylinder-like structure that tubular shell 20 is little in the large hypomere of epimere, the length of small stair section 20b and the length ratio of large step section 20a are 1:2.
In Fig. 3, the step-like structure that tubular shell 20 is little in the large hypomere of epimere, wherein large step section 20a is cylinder-like structure, and small stair section is rib tubular structure.The length of small stair section 20b and the length ratio of large step section 20a are 1:2.
Because gas generator of the present utility model has 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 illustrate and be not restriction.Technical scope of the present utility model is determined by claims, and comprises the record that is equal to claims and all changes within the scope of this.
Claims (9)
1. a gas generator, is characterized in that: tubular shell (30) lower end is provided with exhaust end cover (50); Tubular shell (30) inner chamber is equipped with gas throttling parts (40), tubular shell (20), cup-shaped igniting housing (12), igniting pedestal (11) from the bottom to top successively;
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 exhausr port (50b);
The cup-shaped structure of described gas throttling parts (40), its open end is relative with exhaust end cover (50) open end; Described gas throttling parts (40) open end is provided with large flange, is provided with little flange near closed end place; Described large flange place external diameter equals and the tubular shell of its corresponding position (30) internal diameter; Described little flange place external diameter is less than and the tubular shell of its corresponding position (30) internal diameter; The upper circle wall between large flange and little flange of gas throttling parts (40) is provided with multiple intercommunicating pore (40f);
Described tubular shell (20) is the little step tubular structure of the large hypomere of outer circle wall epimere, and small stair section lower end is installed in the little flange place of gas throttling parts (40); The large step section external diameter of tubular shell (20) is less than and the tubular shell of its corresponding position (30) internal diameter; Tubular shell (20) circle wall is provided with multiple through hole (20e); Described tubular shell (20) is built with gas generant (60);
Described cup-shaped igniting housing (12) bottom is provided with the seam for blocking mutually with the large step section upper end of tubular shell (20); Cup-shaped igniting housing (12) inside is provided with and passes fiery 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).
2. gas generator according to claim 1, is characterized in that: the exhausr port (50b) on described exhaust end cover (50) is arranged in exhaust end cover circle wall.
3. gas generator according to claim 1, is characterized in that: the exhausr port (50b) on described exhaust end cover (50) is arranged at bottom exhaust end cover.
4. gas generator according to claim 1, is characterized in that: described exhaust end cover (50) open end is provided with flange, and flange outer is connected with tubular shell (30) lower end.
5. gas generator according to claim 1, is characterized in that: described tubular shell (20) the step cylinder-like structure that large hypomere is little in epimere.
6. gas generator according to claim 1, is characterized in that: described tubular shell (20) the step rib tubular structure that large hypomere is little in epimere.
7. gas generator according to claim 1, is characterized in that: the length of described tubular shell (20) small stair section and the length ratio of large step section are 1:1 ~ 2.
8. the gas generator according to claim 1,2 or 3, is characterized in that: the exhausr port (50b) on described exhaust end cover (50) is closed to prevent gas generant from making moist by sealing band.
9. gas generator according to claim 1, is characterized in that: described igniting pedestal (11) outer circle wall is the large step-like structure of the little hypomere of epimere; The closing in of described tubular shell (30) upper end blocks with igniting pedestal small stair portion mutually with fixed ignition pedestal (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520062751.6U CN204452352U (en) | 2015-01-29 | 2015-01-29 | A kind of gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520062751.6U CN204452352U (en) | 2015-01-29 | 2015-01-29 | A kind of gas generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204452352U true CN204452352U (en) | 2015-07-08 |
Family
ID=53659279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520062751.6U Expired - Fee Related CN204452352U (en) | 2015-01-29 | 2015-01-29 | A kind of gas generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204452352U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105984420A (en) * | 2015-01-29 | 2016-10-05 | 湖北航天化学技术研究所 | Gas generator and assembling method thereof |
| CN106072901A (en) * | 2016-08-16 | 2016-11-09 | 刘子俊 | Inflated type protective garment |
-
2015
- 2015-01-29 CN CN201520062751.6U patent/CN204452352U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105984420A (en) * | 2015-01-29 | 2016-10-05 | 湖北航天化学技术研究所 | Gas generator and assembling method thereof |
| CN105984420B (en) * | 2015-01-29 | 2020-01-31 | 湖北航天化学技术研究所 | gas generators and assembling method thereof |
| CN106072901A (en) * | 2016-08-16 | 2016-11-09 | 刘子俊 | Inflated type protective garment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20210129 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |