CN100364819C - Air generator for seat by a secondary driver - Google Patents

Air generator for seat by a secondary driver Download PDF

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Publication number
CN100364819C
CN100364819C CNB2006100114760A CN200610011476A CN100364819C CN 100364819 C CN100364819 C CN 100364819C CN B2006100114760 A CNB2006100114760 A CN B2006100114760A CN 200610011476 A CN200610011476 A CN 200610011476A CN 100364819 C CN100364819 C CN 100364819C
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China
Prior art keywords
igniting
funnel
copilot
room
cylindrical tube
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CNB2006100114760A
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Chinese (zh)
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CN1817696A (en
Inventor
姚俊
叶峻
范智
罗运强
陶自成
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Hubei Hangpeng Chemical Power Technology Co Ltd
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No42 Institute Of China Academy Of Launch Vehicle Technology
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Abstract

The present invention relates to an air generator for a seat by a secondary driver, which is composed of a cylinder body and end covers arranged at both ends of the cylinder body. An igniting room, a burning room and a filtering room are arranged in the cylinder body. The igniting room comprises an igniting base and an igniter. Gas generating agent tablets are arranged in the burning room. The present invention is characterized in that the igniting room also comprises an igniting powder cup, and ventholes are uniformly arranged on the end surface of the bottom of the igniting powder cup, and just face the gas generating agent tablets in the burning room; a filler is inserted into the bottom of the burning room, the filler and a sealing plate are limitedly fixed by ring-shaped ridges which are rolled on the circumference of the cylinder body, the upper end of the burning room is separated from the igniting room by an elastic disc and a compression spring which is arranged at the upper part of the elastic disc, holes are distributed on the elastic disc, the upper part of the spring is abutted on the igniting powder cup in the igniting room, the lower part of the spring is used for pressing the elastic disc, and the tight press of the elastic disc makes the gas generating agent tablets fixed. The present invention has the advantages of quick establishment of initial pressure, low inner pressure in the burning room, stable repeat of outlet pressure, good filter, less powder dust, low outlet temperature, etc. and is suitable for various gas generating agents.

Description

The copilot gas generator
Technical field
The present invention relates to provides gas filed copilot gas generator in the automotive safety protection buffer system.
Background technology
The safety guard-safeguard buffer system of automobile as shown in Figure 1, generally comprises impact microphone, controller, gas generator, airbag etc.When automobile bumps, sensor is measured the inertial acceleration that automobile bumps and produces, and signal conducted to controller, controller is judged the size and the time length of crash acceleration, if the size of acceleration/accel and time length surpass or reach predetermined limit value, controller sends ignition signal and starts gas generator.Gas generator will be activated, and produces a large amount of gases and charges into airbag, and airbag expands rapidly and is deployed in the occupant front, produces injures and deaths thereby avoided the occupant because other hard thing of inertial impact force and automobile collides.
Like this this system just require gas generator combustion chamber initial pressure set up fast, in force down, the gas of generation has characteristics such as pressure stability, dust is few, temperature is low.
UK Patent Application 2,263,159, US4,890,860, US5,109,772, US6,474,685, US6,616,183, US6,237,498, US6,314,888, US5,116,080, US5,482,312, US5,585,597 all provide the gas generator of long tubular shell.But there is following subject matter in these patents: (1) above long tubular shell, combustion chamber is all longer, the dress gas generant is more, major part has adopted long primer, just need more igniter during igniting, and ignition mechanism complexity, filtering net are more thick and heavy, directly cause cost higher and be difficult to guarantee the failure-free high-velocity combustion; (2) owing to adopt ignition area less, high velocity air and particulate matter that burning produces can destroy unburned gas generant, take to and cause filtering net to stop up on the filtering net, cause combustion chamber prrassure too high, be difficult to control delivery pressure, and prolonged the time that produces initial pressure; (3) above-mentioned patent does not all provide the fixing and limiting structure of long each intraware of tubular gas generator.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, provide a kind of have set up that initial pressure is fast, force down in the combustion chamber, delivery pressure repeat to stablize, filter good, dust is few, temperature out is low, can adapt to the copilot gas generator of all kinds of gas generants.
Technical solution of the present invention: a kind of copilot gas generator, constitute by cylindrical tube and the upper end cover and the bottom end cover that are positioned at the cylindrical tube two ends, axially be provided with ignition chamber successively from cylindrical tube one end, combustion chamber and filter chamber, ignition chamber comprises igniting pedestal and firing unit, the gas generant tablet is housed in the combustion chamber, filtering net is arranged in the filter chamber, its characteristics are: described ignition chamber also comprises the igniting medicine glass, fill ignition powder in the igniting medicine glass, the bottom end face of igniting medicine glass is evenly distributed first air gate, and perpendicular with the axle of producer, described first air gate faces the gas generant tablet in the combustion chamber; A funnel is also inserted in the bottom of described combustion chamber, funnel bottom separates by seal diaphragm and filter chamber, the annular ridge that funnel and seal diaphragm roll out by the cylindrical tube two ends is come spacing fixing, and funnel is played location and spacing effect, forms the sealing to combustion chamber simultaneously; The upper end of combustion chamber separates by cushion plate and the compression spring and the ignition chamber that are positioned at cushion plate top, be covered with the hole on the cushion plate, the igniting medicine glass in the ignition chamber is withstood on compression spring top, and cushion plate is pushed down in the bottom, is fixed the gas generant tablet by cushion plate.
The present invention compared with prior art has following advantage:
(1) axle of the position of the ignition hole of the igniting medicine glass end in the ignition chamber of the present invention distribution and producer is perpendicular, and ignition powder and ignition hole be arranged in the gas generant top, make ignition chamber have sizable ignition area, form bigger initial combustion face, make gas generant energy economic combustion, thereby make combustor exit pressure lower, and reduced to produce the time of initial pressure;
(2) by in combustion chamber, adopting the suitable funnel of giving vent to anger, match with the end face igniting, change the powder burning [surface, in time the combustion gas in the combustion chamber is drained by conical funnel, can slow down the high temperature gas flow velocity of impact of burning, avoid combustion chamber prrassure too big; And the funnel conical shape then is convenient to shorten the time of setting up initial pressure, matches with the end face igniting simultaneously, can adapt to the gas generant of different qualities, and comformability is strong;
(3) by the funnel that installs additional burning gases have been carried out pre-filtering, protected filtering net, made the present invention have characteristics such as delivery pressure is stable, fuel gas and dust is few, and make the aeration gas flow of generation have desirable pressure delivery curve;
Characteristics such as (4) funnel carries out fixed limit by suitable manner, adopts special-purpose roll extrusion frock to roll out the annular ridge, fixes spacing funnel and seal diaphragm, and it is simple that this mode has processing, easy to assembly; And be evenly equipped with several bar shaped grooves on the conical side face of the funnel of giving vent to anger, this groove helps the burning gas physical efficiency fast by funnel, has accelerated gas flow speed, has guaranteed that combustion chamber prrassure is lower.
(5) according to the gas generant of different qualities, the funnel of giving vent to anger can adapt to the cone diameter of different size and the groove of different size, can guarantee that the aeration gas flow that produces has desirable pressure delivery curve, makes the present invention have the strong characteristics of ecad.
(6) sealing means is reliable.Producer two ends end cap and cylindrical shell are integral with laser welding, at the intermediate seal dividing plate sealing of O RunddichtringO are arranged upwards directly, and end face through hole metal clad paillon foil seals, and guarantee that medicament did not lose efficacy in service life in the producer.
Description of drawings
Fig. 1 is a safety guard-safeguard buffer system workflow diagram;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is a working state schematic representation of the present invention;
Fig. 4 is the front view of combustion chamber funnel of the present invention;
Fig. 5 is the birds-eye view of combustion chamber funnel of the present invention;
Fig. 6 is the front view of combustion chamber band filter funnel of the present invention;
Fig. 7 is the birds-eye view of combustion chamber band filter funnel of the present invention;
Fig. 8 is the local structure scheme drawing of annular ridge fixed funnel of the present invention and closing plate;
Pressue-graph after Fig. 9 the present invention starts in the 60L leakproof tank; Figure 10 is the filtering net after the exhaust of the present invention.
Among above-mentioned each figure, wherein: 1 cylindrical tube, 2 ignitions chamber, 3 firing units, 4 igniting medicine glasses, 5 ignition powders, 6 cushion platies, 7 funnels, 8 combustion chambers, 9 gas generant tablets, 10 springs, 11 bottom end covers, 12 filter chambers, 13 filtering nets, 14 second air gates, 15 bevel for weldings, 16 annular side faces, 17 igniting pedestals, 18 upper end covers, 19 axle center, 20 loam cake circular holes, 21 loam cake outward flanges, 22 cylindrical shell medial surfaces, the axial circular segment of 23 upper end covers, 24 right angle steps, the 25 funnel conical surfaces, the spherical circular arc of 26 funnels, 27 funnel grooves, 28 funnel flex points, 29 funnel annular arrangement steps, 30 cross filter ruffle, 31 first air gates, 32 metal foil films, 33 igniting medicine glass valgus branches, 34 O type rubber rings, the 35 annular ridge, 36 seal diaphragms, 37 O type ring recess, 38 tinsels, 39 bevel for weldings, 40 cushion blocks, 41 boss, end face through hole 42.
The specific embodiment
As shown in Figure 2, the present invention is made of cylindrical tube 1 and the upper end cover 18 and the bottom end cover 11 that are positioned at cylindrical tube 1 two ends, upper end cover 18, bottom end cover 11 adopts laser welding to be integral with cylindrical tube 1, loam cake 18 tops are the plane, the centre has a circular hole 20 to be in 19 positions, axle center, the outward flange 21 of lid is bent downwardly and forms axial circular segment 23, contact formation V-type bevel for welding 15 with cylindrical shell inboard 22, bottom end cover 11 bottoms are a plane, axially vertical with producer, the bottom end cover 11 cylindricals axial bending that makes progress forms and the inboard 22 friction tight annular side faces 16 of cylindrical shell, and plane of bending 21 has also formed the V-type bevel for welding 39 that is suitable for welding with barrel inboard 22.
Be provided with ignition chamber 2, combustion chamber 8 and filter chamber 12 successively from the top axial of cylindrical tube 1.
Ignition chamber 2 comprises igniting pedestal 17, firing unit 3 and igniting medicine glass 4, firing unit 3 belows are ignition powder 5, this medicine is limited in the igniting medicine glass 4, the top part 33 of turning up of igniting medicine glass 4, the pedestal 17 of being lighted a fire is pressed on the right angle step 24 of cylinder inboard wall, thereby plays the effect of fixed ignition medicine glass 4.The bottom end face of igniting medicine glass 4 is evenly distributed first air gate 31, and perpendicular with the axle of producer, and faces the gas generant tablet 9 in the combustion chamber 8, makes it to have sizable ignition area, forms bigger initial combustion face.32 sealings (can be aluminium foil film or corrosion-resistant steel etc.) of first air gate, 31 usefulness metal foil films spill to prevent ignition powder 5.One annular thin wall boss 41 is arranged at igniting pedestal 17 bottoms, can be with firing unit 3 fixed limits behind the flange.
Combustion chamber 8 by cushion plate 6, compression spring 10 and the funnel 7 that inserts of bottom forms, the effect of funnel 7 is exactly that a large amount of combustion gas that end burning produces are in time discharged, and effectively shortens the time that initial pressure produces, the pressure at reduction combustion chamber center.If there is not funnel 7, the gas generant 9 in the combustion chamber 8 is because more, and high velocity air will destroy imperfect combustion pill shapes, makes combustion chamber produce very high pressure, and delivery pressure repeatability is relatively poor.Funnel 7 makes that also the discharge of combustion gas is even, has weakened the impulsive force of high-speed fuel gas stream to filter screen 13, guarantees the integraty of filtering net and good filterability.
Funnel 7 bottoms separate with filter chamber 12 by seal diaphragm 36, and funnel 7 and seal diaphragm 36 are spacing fixing by the annular ridge 35 that the cylindrical tube two ends roll out, and funnel 7 is played location and spacing effect, form the sealing to combustion chamber 8 simultaneously; The upper end of combustion chamber 8 separates with ignition chamber 2 by cushion plate 6 and the compression spring 10 that is positioned at cushion plate 6 tops, be covered with the hole on the cushion plate 6, the igniting medicine glass 4 in the ignition chamber is withstood on compression spring 10 tops, cushion plate 6 is pushed down in the bottom, be fixed gas generant tablet 9 by cushion plate 6, allow gas generant tablet 9 be not easy to move, thus the integraty of gas generant tablet 9 and the conformability that is changed by the combustion face after lighting when guaranteeing vibration.Combustion gas and particulate matter that gas generant tablet 9 burning backs produce enter into filter chamber 12 by funnel 7.
Funnel 7 is shaped as taper shape, funnel top is the spherical circular arc 26 of hollow, is in shaft core position and prolongs the emersion conical surface 25 along bus, radially has some grooves 27 on the conical surface 25, along circumferential rectangular distribution, thereby the inwall that radially extends to cylindrical shell at flex point place 28 forms annular arrangement step 29.Annular arrangement step 29 and seal diaphragm 36 are sandwiched between the two annular ridge 35, thereby are fixed in the cylindrical tube 1.
The quantity of the diameter of exhaust funnel 7, tapering height and groove, position, size can determine flexibly according to the performance that gas generator requires.As when interior pressure is too high, can suitably increasing the quantity or the size of groove, strengthen the combustion gas discharge capacity, reduce interior purpose of pressing thereby reach; And, can increase the height of funnel in order to improve the initial pressure of producer, and be generally 0.5～50mm scope, in a word, the application of the single parameter of funnel 7 and a plurality of parametric synthesis are regulated, and the means of adjustments of gas producer performance are provided.
Funnel 7 outsides can install one as required additional crosses filter ruffle 30; as see shown in Fig. 6,7; cross filter ruffle 30 from outside be enclosed within on the funnel 7; not only play the preliminary cooling of combustion gas and the effect of filtration; and can play buffer action to the vibration of gas generant tablet 9; protect the complete of pill shapes, can prevent spilling of tablet again in addition.
The present invention has adopted the method on the pressure ring ridge, and funnel 7 and seal diaphragm 36 are fixed in the cylindrical tube 1, as shown in Figure 8.Connect adjacent position at cylindrical tube 1 inwall and filter chamber 12, roll out the annular ridge 35 by the roll extrusion frock, cylindrical tube 1 internal modification swells like this, and funnel 7 and seal diaphragm 36 are spacing fixing by the annular ridge 35 that cylindrical tube 1 two ends roll out.
Seal diaphragm 36 planes are vertical with the axle center, seal diaphragm 36 outer rings are ring-shaped rubber O type ring recess 37, are placed with O type rubber ring 34 in groove, and seal diaphragm 36 plate outermost circle and cylinder inboard wall are by certain suitable dimensions gap, with O type circle 34 compressive deformations, form radial seal.Seal diaphragm 36 is pasted tinsel 38 at axial end through hole 42, combustion chamber has been played the effect of sealed damp-proof.
Seal diaphragm 36 and bottom end cover 11 have constituted filter chamber 12.Place ring-type filtering net 13 in the filter chamber 12, filtering net 13 should be spacing in the filter chamber by bottom end cover 11 and cushion block 40.Filtering net 13 is that the metal wire knitted compacting forms, and intensity is better, and difficult quilt is punched destruction.The main effect of filtering net 13 is that the particulate matter that 9 burnings of gas generant tablet produce is filtered out, and combustion gas is absorbed heat and reduced temperature.
Second air gate 14 radially is evenly distributed on the wall of filtering net 13 outside cylindrical shells, the gas after the filtration promptly from then on air gate enter into airbag, second air gate 14 adopts the tinsels sealing.Increase by the second more air gate 14, help increasing open area, can play good filtration and cooling-down effect; Make filtering net 13 frivolous simultaneously, be convenient to reduce weight and cost, this also is the another characteristics of the present invention.
When the vehicle crash, under the judgement of crash sensor, when control system is sent firing command, gas generator work, see Fig. 2, firing unit 3 is excited by electric current, and firing unit 3 is lighted ignition powder 5, and the residues of combustion of ignition powder 5 enters combustion chamber 8 from the end face first air gate 31 high speeds ejection of igniting cup 4 bottoms and lights gas and send out agent tablet 9.Because the present invention has taked the end face sparking mode; so combustion face is bigger; make the time of setting up initial pressure shorter; the a large amount of residues of combustions that produce are in time discharged fast from funnel 7 again; and by after funnel 7 preliminary filtrations and the cooling; the aluminium foil film 38 that breaks through the end-face hole on the seal diaphragm 36 enters filter chamber 12; again by 13 pairs of high-temperature fuel gas filtering particles of filter screen and absorbing and cooling temperature; reduced gas outlet temperature; thereby provide a low temperature failure-free working gas; this gas plays protection occupant's effect with the airbag expansion of expanding rapidly.
With the test of electric current shot point fire, data as shown in Figure 9 in the 60L leakproof tank.Maximum internal pressure P of the present invention 1Max=13.76MPa, container inner pressure are P 2Max=0.299MPa reaches P 2The 95% time t95%max=48.6ms of max, container pressure time of origin 4.5ms.
Filtering net behind the ignition trigger of the present invention as shown in figure 10, residue that gas generating agent burning produces and particulate matter substantially all are filtered net filtration and get off, filtering net does not have phenomenons such as breakage, perforation, proves the lower characteristics of good, the interior pressure of filterability.
Originally be the generating means that aeration gas flow is provided for the safety guard-safeguard buffer system of automobile; can be used for safety air bag; also can be used for inflatable seat belt, inflatable knee bolster, in the airbag and device of an inflatable head gas curtain and a side air bag and an above-mentioned buffer action.

Claims (10)

1. copilot gas generator, by cylindrical tube (1) be positioned at the upper end cover (18) at cylindrical tube (1) two ends and bottom end cover (11) constitutes, axially be provided with ignition chamber (2), combustion chamber (8) and filter chamber (12) successively from cylindrical tube (1) one end, ignition chamber (2) comprises igniting pedestal (17) and firing unit (3), gas generant tablet (9) is housed in the combustion chamber (8), filtering net (13) is arranged in the filter chamber (12), it is characterized in that:
Described ignition chamber (2) also comprises igniting medicine glass (4), fill ignition powder (5) in the igniting medicine glass (4), the bottom end face of igniting medicine glass (4) is evenly distributed first air gate (31), and described first air gate (31) faces the gas generant tablet (9) in the combustion chamber (8);
A funnel (7) is also inserted in the bottom of described combustion chamber (8), funnel (7) bottom separates with filter chamber (12) by seal diaphragm (36), the annular ridge (35) that funnel (7) and seal diaphragm (36) roll out by the cylindrical tube two ends is come spacing fixing, funnel (7) is played location and spacing effect, form sealing simultaneously combustion chamber (8); The upper end of combustion chamber (8) separates with ignition chamber (2) by cushion plate (6) and the compression spring (10) that is positioned at cushion plate (6) top, cushion plate has been covered with the hole on (6), the igniting medicine glass (4) in the ignition chamber is withstood on compression spring (10) top, cushion plate (6) is pushed down in the bottom, is fixed gas generant tablet (9) by cushion plate (6).
2. copilot gas generator according to claim 1 is characterized in that: first air gate (31) of described igniting medicine glass (4) adopts metal foil film (32) sealing, spills to prevent ignition powder (5).
3. copilot gas generator according to claim 1, it is characterized in that: described funnel (7) is shaped as taper shape, its top is the spherical circular arc (26) of hollow, be in shaft core position and prolong the emersion conical surface (25) along bus, radially have groove (27) on the conical surface (25), along circumferential rectangular distribution, the described conical surface (25) in flex point place (28) thus the inwall that radially extends to cylindrical tube forms annular arrangement step (29), annular arrangement step (29) and seal diaphragm (36) are sandwiched between the two annular ridge (35), thereby are fixed in the cylindrical tube (1).
4. copilot gas generator according to claim 1 is characterized in that: described funnel (7) is outer also to be set with filtering net (30), plays pre-filtering and prevents the effect that tablet spills.
5. copilot gas generator according to claim 1, it is characterized in that: the top of the igniting medicine glass (4) of described combustion chamber (2) turn up the part (33), be pressed on the right angle step (24) of cylindrical tube inwall by igniting pedestal (17), thereby play the effect of fixed ignition medicine glass (4).
6. copilot gas generator according to claim 1, it is characterized in that: an annular thin wall boss (41) is arranged at igniting pedestal (17) bottom of described ignition chamber (2), can be with firing unit (3) fixed limit behind described annular thin wall boss (41) flange.
7. copilot gas generator according to claim 1 is characterized in that: conical contact surface is to seal by sealant or packing seal in the middle of described firing unit (3) and the igniting pedestal (17).
8. copilot gas generator according to claim 1 is characterized in that: on the wall of described filtering net (13) outside cylindrical tube, radially be distributed with second air gate (14) equably, the gas after the filtration promptly from then on air gate enter into airbag.
9. copilot gas generator according to claim 1, it is characterized in that: upper end cover at described cylindrical tube and two ends (18) and bottom end cover (11) adopt laser welding to be integral, in intermediate seal dividing plate (36) footpath O RunddichtringO (34) sealing is housed upwards, the end face through hole (42) of seal diaphragm (36) has tinsel (38) to seal.
10. copilot gas generator according to claim 8 is characterized in that: described second air gate (14) adopts the tinsel sealing.
CNB2006100114760A 2006-03-10 2006-03-10 Air generator for seat by a secondary driver Active CN100364819C (en)

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CN100364819C true CN100364819C (en) 2008-01-30

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7712778B2 (en) * 2007-10-29 2010-05-11 Autoliv Asp, Inc. Dual stage cylindrical inflator with outside to inside axial flow
JP5800732B2 (en) * 2012-03-06 2015-10-28 株式会社ダイセル Gas generator for passenger restraint system
CN106422241A (en) * 2016-12-09 2017-02-22 徐玉炜 Football door
CN109664857B (en) * 2018-12-26 2023-12-15 宁波保税区艾尔希汽车有限公司 Mixed gas generator for side air bag
CN110371073B (en) * 2019-07-01 2021-11-09 均胜汽车安全***(湖州)有限公司 Exhaust hole structure of pyrotechnic gas generator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6029994A (en) * 1996-12-18 2000-02-29 Livbag S.N.C. Integral tubular generator for inflating protective cushions
WO2000050274A1 (en) * 1999-02-26 2000-08-31 Automotive Systems Laboratory, Inc. Two chamber gas generator
US20040053182A1 (en) * 2000-09-19 2004-03-18 Masahiro Yoshida Gas generator
JP2005178643A (en) * 2003-12-22 2005-07-07 Daicel Chem Ind Ltd Gas generator for air bag
CN1732368A (en) * 2002-12-25 2006-02-08 日本化药株式会社 Gas producer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6029994A (en) * 1996-12-18 2000-02-29 Livbag S.N.C. Integral tubular generator for inflating protective cushions
WO2000050274A1 (en) * 1999-02-26 2000-08-31 Automotive Systems Laboratory, Inc. Two chamber gas generator
US20040053182A1 (en) * 2000-09-19 2004-03-18 Masahiro Yoshida Gas generator
CN1732368A (en) * 2002-12-25 2006-02-08 日本化药株式会社 Gas producer
JP2005178643A (en) * 2003-12-22 2005-07-07 Daicel Chem Ind Ltd Gas generator for air bag

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