CN201089435Y

CN201089435Y - Gas producer

Info

Publication number: CN201089435Y
Application number: CNU2007201213585U
Authority: CN
Inventors: 李俊杰; 吴伟江; 谭珂; 何建梅; 王保利
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2007-07-10
Filing date: 2007-07-10
Publication date: 2008-07-23
Anticipated expiration: 2017-07-10

Abstract

The utility model discloses a conveniently assembled gas generator which comprises a hermetic shell, an ignition system which is arranged on one end inside the shell, gas generation medicine which is filled in a receiving space inside the shell and ignited by the ignition system, a filter which is arranged on the inner wall of the shell for gas passing through, and exhaust vents which are arranged on the shell and communicated with the filter, wherein, the length of the filter is smaller than that of the receiving space received with the gas generation medicine inside the shell in the arrangement direction of the filter. The filter can be shortened greatly in the length direction, so that assembly space of the gas generation medicine can be relatively larger, and the gas generator arranged in an airbag can meet the requirement of miniaturized airbag module.

Description

Gas generator

Technical field

The utility model relates to a kind of gas generator, particularly a kind of gas generator of safety air bag.

Background technology

Behind automobile generation high-speed crash, the passenger is because inertia can be to preshoot, bumps with hard thing such as bearing circle, the gauge panel etc. in the place ahead in the car, can cause personal injury.Therefore in the automobile air bag module must be installed, this air bag module is the moment behind auto against to produce a large amount of gases, is full of air bag, forms a gas buffer band between occupant and hard thing, thus protection occupant's safety.Wherein, described a large amount of gas is produced by air-cushion inflator.

Along with the development of automotive technology, more and more diversified, the miniaturization of the modeling requirement of air bag module, the profile to air-cushion inflator also requires miniaturization accordingly simultaneously.At present, the barrel-contoured gas generator of the general use of some front-row occupant air bag modules, as shown in Figure 7, this gas generator comprises housing 01, ignition system 02, gas generant composition in accordance 03 and filter 04, the principle of work of this gas generator is: after receiving ignition signal, ignition system 02 is put the gas generant composition in accordance 03 of igniting of fighting rapidly, and gas generant composition in accordance 03 produces a large amount of gases rapidly, and these a large amount of gases are gone out from the deflation hole 07 on the housing 01 through filters 04.Its middle filtrator 04 is used for filtering the residue that gas generant composition in accordance 03 burning back produces, and prevents that residue from going out deflation hole and air bag is burnt.The filter 04 of this gas generator is positioned at the inside of housing 01, and run through the axial of housing 01, occupied very big space, cause the assembly space of gas generant composition in accordance 03 to reduce relatively, so the volume of this gas generator is generally bigger, can not satisfy the demand of air bag module miniaturization, and housing 01 with adopt the mode (011,012 is the threaded connection place among the figure) be threaded in the base assembly 05 of housing 01 end, assembling between the end cap 06, be unfavorable for the raising of production efficiency.

Summary of the invention

In order to address the above problem, the utility model provides a kind of profile gas generator less and easy to assembly, the filter of this gas generator has obtained shortening largely compared to existing technology, so the volume of gas generator can dwindle relatively, make this gas generator pack into and can satisfy the requirement of air bag module miniaturization in the safety air bag.

The utility model is achieved through the following technical solutions:

A kind of gas generator, has the leak free housing, end in described enclosure interior is provided with ignition system, in the receiving space of enclosure interior, be filled with the gas generant composition in accordance that to ignite by ignition system, inwall at housing is equipped with the filter that is used for by gas, offer the deflation hole that communicates with filter on the described housing, it is characterized in that: the length of described filter has a gas generant composition in accordance less than described enclosure interior receiving space is provided with the length of direction at filter.

On the said structure basis, wherein:

Described filter can cover described deflation hole at least.

The end of described filter length direction is provided with the seal ring that engages with described inner walls.

A side of neighbor filter is provided with the sunk area that is used to seal and fix described filter end on the described seal ring.

Described seal ring has the spigot surface that directional later exhaust flows to, and the inwall place of contiguous described housing tilts to the receiving space that described filter surrounded certainly.

Described housing and filter are tubular, two open ends at described housing are equipped with base and end cap respectively hermetically, and two open ends of described housing are formed with the step surface towards enclosure interior of closing in shape respectively, are formed with the end face that fits tightly with described step surface on the outer surface of base and end cap respectively.

Offer circumferential groove respectively on the circumferencial direction of described base and end cap upper edge inner walls, the seal ring that inner walls is engaged with base and end cap seal is installed in described circumferential groove.

Than prior art, advantage of the present utility model is:

(1) in the utility model, because the size of filter has obtained shortening largely on the basis that covers deflation hole, therefore the volume of gas generator can dwindle relatively, thereby make this gas generator can satisfy the requirement of miniaturization, and setting by seal ring, can seal the end of filter, prevent that the residue after the gas generant composition in accordance burning from passing the slit between filter and the housing and burning out air bag.

(2) after the both ends open of the utility model housing is in mounting seat assembly and end cap, all adopt fixing described base assembly of closing in mode and end cap, this kind assembling is simple and convenient, has given up the mode that is threaded, thereby can reduce production costs, enhance productivity;

(3) be respectively equipped with seal ring with the inner walls closed contact on the circumferential surface of base and end cap, the sealing circle has guaranteed do not have the slit between housing and base and the end cap, has guaranteed the utility model good sealing property.

Description of drawings

Fig. 1 is a structure cross-sectional schematic of the present utility model.

Fig. 2 is the structure cross-sectional schematic of base assembly of the present utility model.

Fig. 3 is the structure cross-sectional schematic of housing of the present utility model.

Fig. 4 is the structure cross-sectional schematic of seal ring of the present utility model.

Fig. 5 is the plan sketch of end cap of the present utility model.

Fig. 6 is the assembling scheme drawing between seal ring of the present utility model, filter, end cap and the housing.

Fig. 7 is the structure cross-sectional schematic of the gas generator of prior art.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Please refer to Fig. 1, gas generator of the present utility model comprises housing 1, base assembly 2, gas generant composition in accordance 3, filter 4, seal ring 5, end cap 6 and seal ring 7.

The two ends that described housing 1 profile is tubular and this housing 1 have opening, both ends open place at this housing 1 is equipped with base assembly 2 and end cap 6 respectively hermetically, this base assembly 2 includes the ignition system 8 that is positioned at enclosure interior, as shown in Figure 2, this ignition system 8 is by being installed in squib 10 on the base 9, and linking to each other with base 9 and to be positioned at housing 1 in-to-in medicine box 11 and to form, the ignition charge 12 that can be ignited by this squib 10 is housed in this medicine box 11, and medicine box 11 has the thickness that the energy after ignition charge 12 ignites can be washed open easily.

The inwall place of pressing close to housing 1 in this housing 1 inside is equipped with can be by the filter 4 (Fig. 1) of gas, and this filter 4 is cylindric, offers the deflation hole 13 (asking simultaneously referring to Fig. 3) that communicates with this filter 4 on this housing 1.In housing 1 inner remaining receiving space, be filled with the gas generant composition in accordance 3 that to ignite by ignition system 8, be provided with the seal ring 5 that engages with housing 1 inwall in the end of these filter 4 axial lengths.The axial length of this filter 4 can be largely less than the greatest axial length in the space that is used for filling gas generant composition in accordance 3 in the housing 1, and the size of filter 4 needs can cover deflation hole 13 at least, and has gas and the effective ability of filtering the residue that is produced after gas generant composition in accordance 3 burnings that gas generant composition in accordance 3 is produced of discharging.

Please refer to Fig. 1 and Fig. 4, described seal ring 5 is the loudspeaker tubular, small-bore 14 receiving spaces that surrounded towards described filter 4 of sealing ring 5.A side of neighbor filter 4 is provided with and is used to seal the also sunk area 15 of Fixed-Filter 4 ends on the seal ring 5, and the end face of the inside face of sunk area 15 and filter 4 fits tightly.Seal ring 5 has the spigot surface 50 that directional later exhaust flows to, described spigot surface 50 tilts to the receiving space that filter 4 is surrounded from the inwall place of contiguous housing 1, the receiving space that this filter 4 of gas flow that the spigot surface 50 of sealing ring 5 can allow the gas generant composition in accordance 3 burning backs in spigot surface 50 outsides produce is surrounded.In the present embodiment, the internal diameter of the external diameter of sealing ring 5 and housing 1 adopts interference fit, and in other embodiments, sealing ring 5 can be one of the forming or adopt alternate manner to fix with housing 1.

In the present embodiment, only seal ring 5 has been installed, in other embodiments, can a seal ring 5 be installed respectively at the two ends of filter 4 axial lengths in an end of filter 4 length directions.Seal ring 5 is installed on the described filter 4 end adjacent to base assembly 2 in the present embodiment, end face 16 is installed is fitted tightly for one that offers on the end face of the other end of this filter 4 and the described end cap 6, be used to seal the also other end (seeing Fig. 5, Fig. 6) of Fixed-Filter 4, if seal ring 5 has all been installed in two ends at filter 4 length directions, then can omit the project organization that end face 16 is installed.

Both ends open place on described housing 1 be formed with respectively the closing in shape towards housing 1 in-to-in step surface 17,18 (Fig. 1), on the outer surface of base assembly 2 and end cap 6, be formed with the end face that fits tightly with this

step surface

17,18 respectively.

Please refer to Fig. 1, Fig. 2 and Fig. 5, offer circumferential groove c1, c2 respectively on the circumferencial direction of described base 9 and end cap 6 upper edge housings 1 inwall, being separately installed with in this circumferential groove c1, c2 can be with the seal ring 7 of housing 1 inwall and base 9 and end cap 6 sealed engagement.

The utility model has been installed seal ring 5 in the end of filter 4, this structure design is realized on the basis of effective filtration residue and emission gases at filter 4, the length of filter 4 is shortened largely, and the assembly space of gas generant composition in accordance 3 relatively becomes greatly, makes this air-cushion inflator can satisfy the requirement of miniaturization.

Behind the both ends open place mounting seat assembly 2 and end cap 6 of housing 1 of the present utility model, all adopt fixing described base assembly 2 of closing in mode and end cap 6, assembling between this kind base assembly 2, end cap 6 and the housing 1 is simple and convenient, given up thread connecting mode, can reduce production costs, enhance productivity.

Be respectively equipped with the seal ring 7 with housing 1 inwall closed contact on the circumferential surface of base 9 and end cap 6, sealing circle 7 has guaranteed do not have the slit between housing 1 and base assembly 2 and the end cap 6, has guaranteed excellent sealing of the present utility model.

In addition, the housing 1 in-to-in medicine box 11 that is positioned at of the present utility model also can shorten in right amount at length direction, with the assembly space of relative raising gas generant composition in accordance 3.

Claims

1. gas generator, has the leak free housing, end in described enclosure interior is provided with ignition system, in the receiving space of enclosure interior, be filled with the gas generant composition in accordance that to ignite by ignition system, inwall at housing is equipped with the filter that is used for by gas, offer the deflation hole that communicates with filter on the described housing, it is characterized in that: the length of described filter has a gas generant composition in accordance less than described enclosure interior receiving space is provided with the length of direction at filter.

2. gas generator as claimed in claim 1 is characterized in that: described filter can cover described deflation hole at least.

3. gas generator as claimed in claim 2 is characterized in that: the end of described filter length direction is provided with the seal ring that engages with described inner walls.

4. gas generator as claimed in claim 3 is characterized in that: a side of neighbor filter is provided with the sunk area that is used to seal and fix described filter end on the described seal ring.

5. gas generator as claimed in claim 4 is characterized in that: described seal ring has the spigot surface that directional later exhaust flows to, and the inwall place of contiguous described housing tilts to the receiving space that described filter surrounded certainly.

6. gas generator as claimed in claim 3 is characterized in that: the external diameter of described seal ring and the internal diameter of housing are interference fit.

7. gas generator as claimed in claim 3 is characterized in that: described seal ring and housing are one of the forming.

8. as claim 3 or 4 or 5 described gas generators, it is characterized in that: described seal ring is arranged on the described filter adjacent to an end of base, and the other end of described filter fixes by the installation section of offering on the described end cap and seals.

9. as claim 3 or 4 or 5 described gas generators, it is characterized in that: described seal ring is a pair of, is separately positioned on the two ends of described filter axial length.

10. gas generator as claimed in claim 1, it is characterized in that: described housing and filter are tubular, two open ends at described housing are equipped with base and end cap respectively hermetically, and two open ends of described housing are formed with the step surface towards enclosure interior of closing in shape respectively, are formed with the end face that fits tightly with described step surface on the outer surface of base and end cap respectively.

11. gas generator as claimed in claim 10 is characterized in that: offer circumferential groove respectively on the circumferencial direction of described base and end cap upper edge inner walls, the seal ring that inner walls is engaged with base and end cap seal is installed in described circumferential groove.