CN111071200B - Gas generator - Google Patents

Gas generator Download PDF

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Publication number
CN111071200B
CN111071200B CN201911381750.7A CN201911381750A CN111071200B CN 111071200 B CN111071200 B CN 111071200B CN 201911381750 A CN201911381750 A CN 201911381750A CN 111071200 B CN111071200 B CN 111071200B
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CN
China
Prior art keywords
annular filter
combustion chamber
opening
chamber cover
shell
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CN201911381750.7A
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Chinese (zh)
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CN111071200A (en
Inventor
罗运强
付文斌
杨志雄
张印明
郭孝敏
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Hubei Hangpeng Chemical Power Technology Co Ltd
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Hubei Hangpeng Chemical Power Technology Co Ltd
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Priority to CN201911381750.7A priority Critical patent/CN111071200B/en
Publication of CN111071200A publication Critical patent/CN111071200A/en
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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
    • 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
    • B60R21/2644—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 using only solid reacting substances, e.g. pellets, powder
    • 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
    • B60R21/276—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 with means to vent the inflation fluid source, e.g. in case of overpressure
    • 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
    • B60R2021/26011—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 a filter through which the inflation gas passes

Abstract

The invention relates to a gas generator, which comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner; in operation, the combustion chamber cover is pushed by the impact generated by the gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that the opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and the combustion gas is discharged by the exhaust holes arranged on the upper shell after radially passing through the annular filter.

Description

Gas generator
Technical Field
The present invention relates to a gas generator suitable for a restraint device such as an airbag device of a vehicle or the like.
Background
The gas generator is intended to protect the vehicle occupants and, through a self-actuating procedure of the safety restraint system, is automatically inflated without the intervention of an operator, i.e., a "passive restraint system". In a gas generator used in a restraining device such as an airbag device, various components and a gas generating agent are contained in a housing of the generator, and it is important to allow the gas to pass through a filter to be efficiently filtered to maintain high quality of the generator.
The CN 104203658A patent discloses a gas generator in which a ring filter is supported by a retainer, and upon actuation, the retainer and the ring filter move so that the ring filter is hermetically connected to the top plate of the diffuser shell, and combustion gas is discharged radially outward through the ring filter, but its filter is small and the overall structure is complicated.
US 8894096B 2 discloses a gas generator comprising a body connected to the base of a diffuser member, a filter member comprising a top plate and a side wall having an outlet end, and a combustion chamber disposed within the body having an open end, the filter being in gas flow communication with the open end in the combustion chamber cover, the filter comprising at least one baffle plate and a plurality of exhaust holes. However, since the gas is discharged from the upper end and then enters the sidewall of the filter, and the lower end has no fixing device, the filter is easily moved, and the filtering effect is reduced.
Disclosure of Invention
The technical problem solved by the invention is as follows: overcomes the defects of the prior art and provides a gas generator.
The technical scheme of the invention is as follows: a gas generator comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner;
in operation, the combustion chamber cover is pushed by the impact generated by the gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that the opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and the combustion gas is discharged by the exhaust holes arranged on the upper shell after radially passing through the annular filter.
Preferably, the combustion chamber cover is a semi-closed structure with an opening at one end and an outer flanging, the annular filter is of an annular structure with opposite bending parts at two ends, the upper end bending part and the outer flanging of the combustion chamber cover are supported in an overlapped mode, and the lower end bending part is abutted against the inner wall of the lower shell.
Preferably, the outer diameter of the opening flanging of the combustion chamber cover is larger than the inner diameter of the opening of the annular filter, the outer diameter of the opening of the lower end convex part of the annular filter is larger than the inner diameter of the cavity of the lower shell, and the inner diameter of the opening of the annular filter is larger than the inner diameter of the opening of the upper end convex part of the annular filter.
Preferably, the combustion chamber cover is of a semi-closed structure with an opening at one end and an outer flanging, the annular filter is of an annular structure, the combustion chamber cover and the upper end of the annular filter are fixed through an upper end cushion block pressed between the combustion chamber cover and the annular filter, and the lower end of the annular filter is indirectly abutted against or fixed in the lower shell through a lower end cushion block.
Preferably, the upper end cushion block is of an annular structure with an outward flange, the inner diameter of an opening of the annular filter is larger than that of the opening of the upper end cushion block, the outer diameter of the outward flange of the combustion chamber cover is larger than that of the opening of the annular filter, and the outer diameter of an opening of the lower end cushion block is larger than that of a cavity of the lower shell.
Preferably, the combustion chamber cover be one end opening and the outer flanged semi-closed structure of outband, annular filter is the annular structure that both ends have opposite kink, the upper end kink with the flanging of combustion chamber cover supports through the overlap joint mode, realizes that annular filter and support between the casing down are fixed between upper housing inner wall and annular filter lower extreme kink through annular scalable piece pressure equipment.
Preferably, the outer peripheral wall of the opening of the combustion chamber cover abuts against the bent part at the upper end of the annular filter, the outer diameter of the flanging of the combustion chamber cover is larger than the inner diameter of the opening of the annular filter, and the inner diameter of the opening of the annular filter is larger than the inner diameter of the opening of the bent part at the upper end of the annular filter.
Preferably, the combustion chamber cover is a semi-closed structure with an opening at one end and an outer flanging, the lower end of the annular filter is bent outwards, and the upper end of the annular filter is protruded outwards; the inner part of the bulge is provided with an inward sunken structure, the lower end of the bulge outwards bends to abut against the lower inner wall of the shell, the annular structure of the main body of the annular filter is combined with the upper inner wall of the shell to press and fix the combustion chamber cover, and during operation, the flanging of the combustion chamber cover stops through the upper end sunken structure abutting against the annular filter.
Preferably, the inner diameter of the annular structure of the annular filter main body is smaller than the outer diameter of the outward flanging of the combustion chamber cover, the outer diameter of the outward flanging of the combustion chamber cover is smaller than the maximum opening inner diameter of the inward concave structure, and the outer diameter of the outward flanging of the combustion chamber cover is larger than the opening inner diameter of the outer edge of the inward concave structure; the outer diameter of an opening of the lower end bending part of the annular filter is larger than the inner diameter of the cavity of the lower shell.
Preferably, the ignition device chamber is formed by an ignition device arranged on the bottom of the housing and a cylindrical element fixed to the ignition device.
Preferably, a plurality of conveying holes are formed in the peripheral wall of the cylindrical element, and the plurality of conveying holes are sealed from the outside by a metal sealing foil; the open end of the cylindrical element is provided with an outwardly directed flange portion which is secured by a flange portion of the ignition device, either directly or indirectly.
Preferably, sealing foils are adhered to the inner wall surface of the upper shell and the outer wall surface of the cylindrical element.
Preferably, the material of the sealing foil is stainless steel, copper or aluminum.
Preferably, the forming mode of the bending part of the annular filter is a stamping, cold/warm extrusion process.
Preferably, the annular filter is a multi-layer metal plate net formed by punching perforated steel plates into a ring shape and laminating the perforated steel plates.
Preferably, the total open surface area of the vent holes in the upper housing should be less than the cross-sectional area of the total number of openings in the outer circumferential surface of the annular filter.
Preferably, the vent hole is closed from the inside with a metal sealing foil.
Preferably, the height and the size of the upper end cushion block, the lower end cushion block and the telescopic piece are designed according to the charging amount of the gas generating agent.
Preferably, the annular filter is a supporting device, and the outer diameter and the height of the openings at the upper end and the lower end are designed according to the charging amount of the gas generating agent.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas generator provided by the invention has the advantages that the structure is simpler, the number of parts is less, the charging amount of the gas generating agent can be flexibly adjusted, and the cost is saved;
(2) the invention can adjust the volume of the charge space of the combustion chamber by adjusting the outer diameter of the opening of the annular filter without changing the volume of the gas generator. Not only ensures the full use of the peripheral filtering section of the annular filter, increases the effective filtering area, but also lightens the weight of the whole gas generator.
(3) The combustion gas is discharged after passing through the annular filter, so that the combustion gas is effectively prevented from being discharged from gaps possibly existing at the two ends, and the filtering effect is enhanced.
Drawings
FIG. 1 is a cross-sectional view in the X-axis direction of a gas generator of the present invention (before operation).
Fig. 2 is a cross-sectional view in the X-axis direction of a gas generator of the present invention (after operation).
FIG. 3 is a cross-sectional view in the X-axis direction of a gas generator with a spacer according to the present invention (before operation).
FIG. 4 is a cross-sectional view in the X-axis direction of a gas generator with a spacer according to the present invention (after operation).
FIG. 5 is a cross-sectional view in the X-axis direction of a gas generator with a telescopic member according to the present invention (before operation).
FIG. 6 is a cross-sectional view in the X-axis direction of a gas generator with a telescopic member according to the present invention (after operation).
FIG. 7 is a cross-sectional view in the X-axis direction of a gas generator with a bending member according to the present invention (before operation).
FIG. 8 is a cross-sectional view in the X-axis direction (after operation) of a gas generator with a bending member according to the present invention.
Detailed Description
The present invention provides a gas generator having advantages of easy assembly and high performance. In the housing chamber of the housing, a combustion chamber cover disposed toward the housing is supported by an annular filter, the upper end of the annular filter directly or indirectly fixes the combustion chamber cover by a supporting means such as a convex portion (also called a bent portion) of the annular filter itself, a spacer, etc., and since the opening outer diameter of the combustion chamber cover is larger than the opening inner diameter of the annular filter, the opening inner diameter of the annular filter is larger than the opening inner diameter of the convex portion of the upper end thereof, thereby closing the opening between the combustion chamber cover and the annular filter.
The lower end of the annular filter is directly or indirectly abutted against or fixed in the lower shell through supporting devices such as a convex part (also called a bending part) of the lower end of the annular filter, a cushion block or a telescopic piece, and the opening outer diameter of the convex part at the lower end of the annular filter is larger than the inner diameter of the cavity of the lower shell, so that the opening between the annular filter and the lower shell is closed. Wherein, the convex part is formed by stamping, cold/warm extrusion process.
After the activation, the combustion chamber cover is pushed by the impact generated by the gas generating agent in the combustion chamber and is stopped against the inner peripheral wall of the convex portion of the support means such as the ring filter or the spacer, thereby closing the opening between the combustion chamber cover and the ring filter, while the ring filter is directly or indirectly abutted or fixed by the support means in the lower casing, closing the opening between the ring filter and the lower casing, and the combustion gas is discharged from the gas discharge port through the combustion gas passage after passing radially through the ring filter.
The preferred annular filter is a multi-layer expanded metal sheet punched annularly from perforated steel sheet and laminated. And optimizing the parameters of the thickness of the steel plate, the material of the steel plate, the diameter of the holes, the number of the holes, the positions of the holes, the stamping pressure, the number of laminated layers and the like to optimize the filtering effect and the deformation strength of the annular filter. The annular filter is a supporting device, and the outer diameter and the height of the upper end opening and the lower end opening of the annular filter are designed according to the charging amount of the gas generating agent.
Preferably, a sealing foil is pasted on the inner wall surface of the upper shell and the outer wall surface of the cylindrical element; the sealing foil is made of stainless steel, copper or aluminum.
The total open surface area of the gas discharge ports (i.e., the gas discharge holes provided in the upper housing) should be smaller than the cross-sectional area of the total number of openings in the outer circumferential surface of the annular filter.
The invention is described in detail below with reference to the figures and examples.
Example 1
Embodiment 1 of the gas generator according to the present invention will be explained below with reference to fig. 1 to 2.
In fig. 1, the housing 13 is formed by combining an upper case 11 with a lower case 12, and the open end of the upper case 11 is inserted into the open portion of the lower case 12.
A gas discharge port 11c is formed in the circumferential wall plate 11a of the upper case 11, and the gas discharge port 11c is closed from the inside by a metal seal foil.
Inside the housing 13, an ignition device 17 is inserted into a middle portion of the bottom plate 12a of the lower housing 12, and the downward-facing cylindrical member 16 is defined by the ignition device 17.
A known ignition charge (not shown in the drawings) is packed inside the cylindrical member 16, and a plurality of transfer holes 16a are formed in the peripheral wall 16b of the cylindrical member 16, the plurality of transfer holes 16a being closed with a metal seal foil from the outside.
A flange portion 16c is formed at the open end of the cylindrical member 16 and is fixed by a flange portion 17a of the ignition device 17 directly or indirectly.
The cup-shaped combustion chamber lid 15 disposed toward the upper casing 11 is supported by the annular filter 14 with its opening outer diameter D1 being larger than the opening inner diameter D1 of the annular filter 14 and the opening inner diameter D1 of the annular filter 14 being larger than the opening inner diameter D3 of the upper end convex portion 14a thereof, at which time the combustion chamber lid 15 is press-fitted directly into the interior of the annular filter 14 to be fixed, thereby closing the opening between the combustion chamber lid 15 and the annular filter 14. While a combustion chamber 18 is defined in a closed chamber composed of a combustion chamber cover 15 and an annular filter 14 outside the ignition device 17, and a gas generating agent 19 is filled into the combustion chamber 18.
The annular filter 14 abuts against a part of the peripheral wall 12b of the lower case 12 by the lower end projection 14b, and the opening outer diameter D2 of the lower end projection 14b of the annular filter is larger than the cavity inner diameter D2 of the lower case, thereby being fixed within the lower case 12, closing the opening between the annular filter 14 and the lower case 12.
When the ignition device 17 is activated, the ignition agent inside the cylindrical member 16 is ignited and rapidly burned, and combustion gas enters the combustion chamber 18 through the plurality of transfer holes 16 a.
When the gas generating agent 19 in the combustion chamber 18 is ignited and generates combustion gas, a load is applied in the axial direction by the internal pressure, which is indicated by the arrow in fig. 2. As a result, as shown in fig. 2, the upper case 11 and the lower case 12 are deformed in directions away from each other.
While the combustion chamber cover 15 is pushed by the gas pressure impact in the combustion chamber 18 and moved upward inside the housing 13, the curved portion 15a of the combustion chamber cover 15 abuts against the inner peripheral wall of the upper end convex portion 14a of the annular filter 14 to stop, thereby closing the opening between the combustion chamber cover 15 and the annular filter 14. While the annular filter 14 abuts against a part of the peripheral wall 12b of the lower case 12 by the lower end projection 14b under gas pressure impact and is fixed in the lower case 12, thereby closing the opening between the annular filter 14 and the lower case 12, and the combustion gas is discharged from the gas discharge port 11c through the combustion gas passage after passing radially through the annular filter 14.
Example 2
Embodiment 2 of the gas generator according to the present invention will be explained below with reference to fig. 3 to 4.
In contrast to embodiment 1, embodiment 2 simplifies the structure of the annular filter 14, and replaces the projection structure 14a or 14b of the annular filter 14 with a spacer or the like support means. In fig. 3, the upper end gasket 20 is fixed by being directly or indirectly press-fitted to the opening of the annular filter 14, the opening inner diameter D1 of the annular filter 14 is larger than the opening inner diameter D3 of the upper end gasket 20, and the opening outer diameter D1 of the combustion chamber cover 15 is larger than the opening inner diameter D1 of the annular filter 14, at which time the combustion chamber cover 15 is directly or indirectly press-fitted to the inside of the annular filter 14 to be fixed, thereby closing the opening between the combustion chamber cover 15 and the annular filter 14. The lower end pad 21 abuts against a part of the peripheral wall 12b of the lower case 12, and the opening outer diameter D2 of the lower end pad 21 is larger than the cavity inner diameter D2 of the lower case, at which time the annular filter 14 indirectly abuts against or is fixed in the lower case 12 by the lower end pad 21, thereby also closing the opening between the annular filter 14 and the lower case 12.
After actuation (as shown in fig. 4), when the housing 13 is deformed, the combustion chamber cover 15 is pushed by the gas pressure impact in the combustion chamber 18 and moves upward, and the curved portion 15a of the combustion chamber cover 15 stops abutting against the inner peripheral wall of the upper end pad 20, thereby indirectly closing the opening between the combustion chamber cover 15 and the annular filter 14. At the same time, the annular filter 14 is indirectly fixed in the lower housing 12 by the lower end pad 21 under the impact of the gas pressure, so that the opening between the annular filter 14 and the lower housing 12 is also closed, and the combustion gas is discharged from the gas discharge port 11c through the combustion gas passage after passing radially through the annular filter 14.
Example 3
Embodiment 3 of the gas generator according to the present invention will be explained below with reference to fig. 5 to 6.
As a specific example of embodiment 2, embodiment 3 simplifies part of the structure of the annular filter 14 by the extensible member 22. In fig. 5, the stretchable member 22 is fixed by being directly or indirectly press-fitted to the lower end convex portion 14b of the ring filter 14, at which time the ring filter 14 is indirectly abutted or fixed in the lower case 12 by the stretchable member 22, thereby closing the opening between the ring filter 14 and the lower case 12. A cup-shaped combustion chamber cover 15 disposed toward the casing 13 is supported by the annular filter 14, the combustion chamber cover 15 is opened with an outer diameter D1 larger than the opening inner diameter D1 of the annular filter 14, and the annular filter 14 is opened with an inner diameter D1 larger than the opening inner diameter D2 of the upper end convex portion 14a thereof, at which time the combustion chamber cover 15 is press-fitted directly into the inside of the annular filter 14 to be fixed, thereby closing the opening between the combustion chamber cover 15 and the annular filter 14.
After the actuation (as shown in fig. 6), when the housing 13 is deformed, the combustion chamber cover 15 is pushed by the gas pressure impact in the combustion chamber 18 and moves upward, and the curved portion 15a of the combustion chamber cover 15 abuts against the inner peripheral wall of the upper end convex portion 14a of the annular filter 14 to stop, thereby closing the opening between the combustion chamber cover 15 and the annular filter 14. At the same time, under the impact of gas pressure, the rebound elongation of the extensible member 22 continues to abut against the inner wall of the upper housing 11 and the lower end convex portion 14b of the annular filter 14, thereby indirectly fixing the annular filter 14 in the lower housing 12, thereby also closing the opening between the annular filter 14 and the lower housing 12, and at this time, the combustion gas is discharged from the gas discharge port 11c through the combustion gas passage after passing radially through the annular filter 14.
Example 4
Embodiment 4 of the gas generator according to the present invention will be explained below with reference to fig. 7 to 8.
In fig. 7, the upper end of the annular filter 14 is provided with an inward concave structure 14a, the opening inner diameter D1 of the convex structure is smaller than the opening outer diameter D1 of the combustion chamber cover 15, the opening outer diameter D1 of the combustion chamber cover 15 is smaller than the maximum opening inner diameter D3 of the concave structure 14a at the upper end of the combustion chamber cover 15, the opening outer diameter D1 of the combustion chamber cover 15 is larger than the outer edge opening inner diameter D4 of the annular filter 14, and the combustion chamber cover 15 is directly pressed into the annular filter 14 to be fixed, so that the opening between the combustion chamber cover 15 and the annular filter 14 is closed. The annular filter 14 abuts against a part of the peripheral wall 12b of the lower case 12 by the lower end projection 14c, and the opening outer diameter D2 of the lower end projection 14c of the annular filter is larger than the cavity inner diameter D2 of the lower case, thereby being fixed within the lower case 12, closing the opening between the annular filter 14 and the lower case 12.
After actuation (as shown in fig. 8), when the housing 13 is deformed, the combustion chamber cover 15 is pushed by the gas pressure impact in the combustion chamber 18 and moves upward, and the curved portion 15a of the combustion chamber cover 15 stops abutting against the upper end concave structure 14a of the annular filter 14, thereby closing the opening between the combustion chamber cover 15 and the annular filter 14. While the annular filter 14 abuts against a part of the peripheral wall 12b of the lower case 12 by the lower end convex portion 14c under gas pressure impact, thereby also closing the opening between the annular filter 14 and the lower case 12, at which time the combustion gas is discharged from the gas discharge port 11c through the combustion gas passage after passing radially through the annular filter 14.
The above supporting devices such as the convex part and the cushion block of the upper end of the annular filter 14, and the supporting devices such as the convex part and the cushion block of the lower end of the annular filter 14, and the telescopic piece can be combined in pairs and replaced with each other to directly or indirectly fix the relative positions between the annular filter 14 and the combustion chamber cover 15, and between the annular filter 14 and the lower shell 12, so that the openings between the combustion chamber cover 15 and the annular filter 14, and between the annular filter 14 and the lower shell 12 are closed.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.

Claims (18)

1. A gas generator, characterized by: the air exhaust device comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an air exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner;
in operation, the combustion chamber cover is pushed by impact generated by gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that an opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and combustion gas is exhausted by an exhaust hole arranged on the upper shell after radially passing through the annular filter; the combustion chamber cover be one end opening and outband turn-ups semi-closed structure, annular filter has the annular structure of opposite kink for both ends, the upper end kink with the turn-ups of combustion chamber cover supports through the lapped mode, the lower extreme kink supports and leans on at lower shells inner wall.
2. The gas generator of claim 1, wherein: the outer diameter of an opening flanging of the combustion chamber cover is larger than the inner diameter of an opening of the annular filter, the outer diameter of an opening of a lower convex part of the annular filter is larger than the inner diameter of a cavity of the lower shell, and the inner diameter of the opening of the annular filter is larger than the inner diameter of an opening of an upper convex part of the annular filter.
3. A gas generator, characterized by: the air exhaust device comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an air exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner;
in operation, the combustion chamber cover is pushed by impact generated by gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that an opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and combustion gas is exhausted by an exhaust hole arranged on the upper shell after radially passing through the annular filter; the combustion chamber cover is of a semi-closed structure with an opening at one end and an outer flanging, the annular filter is of an annular structure, the combustion chamber cover and the upper end of the annular filter are fixed through an upper end cushion block pressed between the combustion chamber cover and the annular filter, and the lower end of the annular filter is indirectly abutted against or fixed in the lower shell through a lower end cushion block.
4. The gas generator of claim 3, wherein: the upper end cushion block is of an annular structure with an outward flange, the inner diameter of an opening of the annular filter is larger than that of the opening of the upper end cushion block, the outer diameter of the outward flange of the combustion chamber cover is larger than that of the opening of the annular filter, and the outer diameter of an opening of the lower end cushion block is larger than that of a cavity of the lower shell.
5. A gas generator, characterized by: the air exhaust device comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an air exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner;
in operation, the combustion chamber cover is pushed by impact generated by gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that an opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and combustion gas is exhausted by an exhaust hole arranged on the upper shell after radially passing through the annular filter; the combustion chamber cover be one end opening and outband turn-ups's semi-closed structure, annular filter has the annular structure of opposite kink for both ends, the upper end kink with the turn-ups of combustion chamber cover supports through the lapped mode, realizes that annular filter and support between the casing down are fixed between last inner wall of the shell and the annular filter lower extreme kink through annular scalable piece pressure equipment.
6. The gas generator of claim 5, wherein: the outer peripheral wall of the opening of the combustion chamber cover is abutted to the upper end bent part of the annular filter, the outer diameter of the outer flange of the combustion chamber cover is larger than the inner diameter of the opening of the annular filter, and the inner diameter of the opening of the annular filter is larger than the inner diameter of the opening of the upper end bent part of the annular filter.
7. A gas generator, characterized by: the air exhaust device comprises a shell formed by combining an upper shell and a lower shell, wherein the upper shell is provided with an air exhaust hole, and the inner cavity of the shell is an accommodating cavity; the accommodating cavity is internally provided with an ignition device chamber and a combustion chamber which surrounds the ignition device chamber and is filled with gas generating agent; the combustion chamber comprises a combustion chamber cover arranged towards the lower shell and an annular filter; the annular filter supports the combustion chamber cover in a direct or indirect manner;
in operation, the combustion chamber cover is pushed by impact generated by gas generating agent in the combustion chamber and is directly or indirectly limited and stopped by the annular filter, so that an opening between the combustion chamber cover and the annular filter is closed, meanwhile, the annular filter is directly or indirectly abutted against or fixed in the lower shell, the opening between the annular filter and the lower shell is closed, and combustion gas is exhausted by an exhaust hole arranged on the upper shell after radially passing through the annular filter; the combustion chamber cover is of a semi-closed structure with an opening at one end and an outer flanging, the lower end of the annular filter is bent outwards, and the upper end of the annular filter is protruded outwards; the inner part of the bulge is provided with an inward sunken structure, the lower end of the bulge outwards bends to abut against the lower inner wall of the shell, the annular structure of the main body of the annular filter is combined with the upper inner wall of the shell to press and fix the combustion chamber cover, and during operation, the flanging of the combustion chamber cover stops through the upper end sunken structure abutting against the annular filter.
8. The gas generator of claim 7, wherein: the inner diameter of the annular structure of the annular filter main body is smaller than the outer diameter of the outward flanging of the combustion chamber cover, the outer diameter of the outward flanging of the combustion chamber cover is smaller than the maximum opening inner diameter of the inward concave structure, and the outer diameter of the outward flanging of the combustion chamber cover is larger than the opening inner diameter of the outer edge of the inward concave structure; the outer diameter of an opening of the lower end bending part of the annular filter is larger than the inner diameter of the cavity of the lower shell.
9. The gas generator according to any one of claims 1 to 8, wherein: the ignition device chamber consists of an ignition device arranged on the bottom of the housing and a cylindrical element fixed to the ignition device.
10. The gas generator of claim 9, wherein: the peripheral wall of the cylindrical element is provided with a plurality of conveying holes, and the plurality of conveying holes are sealed from the outside by metal sealing foils; the open end of the cylindrical element is provided with an outwardly directed flange portion which is secured by a flange portion of the ignition device, either directly or indirectly.
11. The gas generator of claim 9, wherein: and sealing foils are adhered to the inner wall surface of the upper shell and the outer wall surface of the cylindrical element.
12. The gas generator of claim 11, wherein: the sealing foil is made of stainless steel, copper or aluminum.
13. The gas generator of claim 1 or 2 or 5 or 6 or 7 or 8, wherein: the forming mode of the bending part of the annular filter is stamping, cold/warm extrusion process.
14. The gas generator according to any one of claims 1 to 8, wherein: the annular filter is a multi-layer metal plate net formed by punching perforated steel plates into a ring shape and laminating the perforated steel plates.
15. The gas generator of claim 1, wherein: the total open surface area of the vent holes in the upper housing should be less than the cross-sectional area of the total number of openings in the outer circumferential surface of the annular filter.
16. The gas generator according to claim 1 or 15, characterized in that: the vent holes are closed from the inside by a metal sealing foil.
17. The gas generator as claimed in claim 3 or 4 or 5 or 6, wherein: the height and the size of the upper end cushion block, the lower end cushion block and the telescopic piece are designed according to the charging amount of the gas generating agent.
18. The gas generator of claim 1, wherein: the annular filter is a supporting device, and the outer diameter and the height of the upper end opening and the lower end opening are designed according to the charging amount of the gas generating agent.
CN201911381750.7A 2019-12-27 2019-12-27 Gas generator Active CN111071200B (en)

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