CN207128832U - Suitable for the gas generator of safe automobile air bag - Google Patents

Abstract

The utility model discloses a kind of gas generator suitable for safe automobile air bag, including hood, upper lid, lower cover, the upper lid and lower cover form closed gas generation chamber；The upper lid is in hood, the longitudinal section of the hood is in cap type, the hood has the top for being used for covering on lid and the water conservancy diversion cavity of guiding region is collectively forming with upper lid, water conservancy diversion cavity is bottomless cylinder, top is plane, gas feed is provided with the upper lid, gases at high pressure enter guiding region by gas generation chamber through the gas feed；The water conservancy diversion cavity of the hood and upper cap-shaped into guiding region include the first guiding region and be depressured guiding region.The utility model provides a kind of gas generator suitable for safe automobile air bag, and it has guiding region, and interim decompressional expansion is carried out to the gases at high pressure of generation, so as to avoid, to gas generator damaging property impact in itself, avoiding the occurrence of air bag casualty accident.

Description

Suitable for the gas generator of safe automobile air bag

Technical field

A kind of gas generator suitable for safe automobile air bag is the utility model is related to, belongs to automotive Airbag Technology Field.

Background technology

Gas generator common at present is mostly single combustion chamber, and when igniting starts, moment produces very high internal pressure, interior Line slope of buckling is very high, is unfavorable for the smooth expansion of air bag module, and the probability for producing drawbacks described above is higher；Also have and attempt by two The gas generator that the mode that secondary delay is ignited manufactures, such as：Inflatable gas hair is ignited in a kind of secondary delays of CN105644491A Raw device, internal pressure caused by the moment of ignition makes moderate progress, but its is complicated, and particularly gas generator assembly is complicated, Manufacture difficulty is big, and cost is high, therefore, the further research of the gas generator of single combustion chamber is still directed in industry, special Xi Wang not design, produce it is simple in construction, securely and reliably, the low air-cushion inflator subassembly product of manufacturing cost.

The content of the invention

Technical problem to be solved in the utility model is：Overcome the deficiencies in the prior art, there is provided one kind is applied to automobile The gas generator of air bag, it has guiding region, interim decompressional expansion is carried out to the gases at high pressure of generation, so as to avoid To gas generator, damaging property is impacted in itself, avoids the occurrence of air bag casualty accident.

In order to solve the above-mentioned technical problem, the technical solution of the utility model is：It is a kind of suitable for safe automobile air bag Gas generator, including hood, upper lid, lower cover, the upper lid and lower cover form closed gas generation chamber；The upper lid position In in hood, the longitudinal section of the hood is in cap type, the hood have the top that is used for covering on lid and with Upper to cover the water conservancy diversion cavity for being collectively forming guiding region, water conservancy diversion cavity is bottomless cylinder, and top is plane, is opened on the upper lid There is gas feed, gases at high pressure enter guiding region by gas generation chamber through the gas feed；The water conservancy diversion cavity of the hood with Upper cap-shaped into guiding region include the first guiding region and decompression guiding region, and

First guiding region is used for the high pressure draught even inflation of generation, what the gas of first guiding region passed through Sectional area S1 rate of change is less than 10%；

The decompression guiding region is used to reduce high pressure draught pressure, the sectional area that the gas for being depressured guiding region passes through S2 rate of change is more than 500%；

The hood is provided with multiple steam vents, and the area summation of steam vent in the side wall of decompression guiding region With being depressured the area summation ratio of guiding region side wall 3：1000~6：Between 1000.

Further, the upper lid includes top and side wall, and the side wall of the upper lid and the sidewall weld of hood connect, institute Stating the top of lid includes being located at the plane positioned at the planar section at middle part and the side plate bending around planar section, gas feed Duan Shang, the side plate bending are smoothly connected by multistage cambered surface and formed, the upper tops lateral wall and hood inside top wall it Between distance meet first to reduce the rule that increases afterwards, and the upper caping in the direction that globoidal section increases along guiding region radius Portion's lateral wall is with being the first guiding region and the line of demarcation for being depressured guiding region at the minimum range of hood inside top wall.

After employing above-mentioned technical proposal, the utility model has following beneficial effect：

The gas that the present invention is surrounded with lower cover in upper lid is dredged into guiding region is set up outside raw chamber to the high pressure draught of generation Lead, first, high pressure draught enters the first guiding region, and the sectional area S1 passed through due to the gas of the first guiding region rate of change is less than 10%, therefore air pressure only has reduction slightly in the first guiding region, high pressure draught is able to even inflation；Then, high pressure gas flows into Enter to be depressured guiding region, due to be depressured the gas of guiding region by sectional area S2 increase with guiding region radius and increase rapidly, because This air pressure is declined rapidly in decompression guiding region, in conjunction with the suitable area ratio of steam vent so that air-flow is with satisfactory Speed discharges gas generator, and into air bag, so as to avoid high pressure draught, to gas generator, damaging property is rushed in itself Hit, avoid the occurrence of air bag casualty accident.

Brief description of the drawings

Fig. 1 is the top view of the gas generator of the present utility model suitable for safe automobile air bag；

Fig. 2 is Fig. 1 D-D sectional views；

Fig. 3 is the assembling schematic diagram of upper lid and hood of the present utility model；

Fig. 4 is the schematic diagram of guiding region of the present utility model；

Fig. 5 is the structural representation of gas generation chamber of the present utility model；

Fig. 6 is the structural representation of upper lid of the present utility model；

Fig. 7 is gas flow direction schematic diagram of the present utility model.

Embodiment

In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and combine attached Figure, is described in further detail to the utility model.

As shown in Fig. 1~7, a kind of gas generator suitable for safe automobile air bag, including hood 1, upper lid 2, under Lid 3, the upper lid 2 and lower cover 3 form closed gas generation chamber；The upper lid 2 is located in hood 1, the hood 1 Longitudinal section is in cap type, and the hood 1 has the top for being used for covering on lid 2 and is collectively forming guiding region with upper lid 2 Water conservancy diversion cavity, water conservancy diversion cavity are bottomless cylinder, and top is plane, and gas feed, gases at high pressure are provided with the upper lid 2 Enter guiding region through the gas feed by gas generation chamber；The water conservancy diversion cavity of the hood 1 wraps with the guiding region that upper lid 2 is formed The first guiding region 5 and decompression guiding region 6 are included, and

First guiding region 5 is used for the high pressure draught even inflation to generation, and the gas of first guiding region 5 passes through Sectional area S1 rate of change be less than 10%；

The decompression guiding region 6 is used to reduce high pressure draught pressure, the section that the gas for being depressured guiding region 6 passes through Product S2 rate of change is more than 500%；As shown in figure 3, the circular area of part A represents the position of the first guiding region 5, B in figure Partial annulus area represents the decompression position of guiding region 6；

The hood 1 is provided with multiple steam vents 7, and the area of steam vent 7 in the side wall of decompression guiding region 6 Summation is with being depressured the area summation ratio of the side wall of guiding region 63：1000~6：Between 1000.As marked in Fig. 4, the first water conservancy diversion The section that the gas of area 5 passes through is the face of cylinder using R1 as radius, and it is using R2 as radius to be depressured the gas of guiding region 6 by section The face of cylinder, the radius of guiding region is along the X-direction in figure, highly along the Y-direction in figure.

The generation of gas is separated to carry out by the utility model with decompression, and guiding region is additionally arranged outside gas generation chamber, right The gases at high pressure of generation are depressured stage by stage, first, the gases at high pressure generated in gas generation chamber, from the upper top of lid 2 Gas feed enters guiding region, and gases at high pressure are slightly depressured by the first guiding region 5, due to the gas of the first guiding region 5 The sectional area S1 rates of change passed through are less than 10%, and the volume of gas only has increase slightly, according to The Ideal-Gas Equation pV =nRT, its air pressure only have decline slightly, although now the pressure of air blast is higher, air-flow is mainly distributed on hood 1 Central part region, because high pressure draught at the uniform velocity expands, add, the area shared by the first guiding region 5 is smaller, to hood 1 not Larger destruction impact is produced, so as to avoid high pressure draught damaging to gas generator and hood 1 simultaneously；Its Secondary, in decompression guiding region 6, high pressure draught is progressively close to the steam vent 7 of the side of hood 1, due to leading in the decompression gas of guiding region 6 The sectional area S2 crossed quickly increases, and volume also quickly increases, and contributes to the decay of air velocity, and pressure reduces rapidly, air-flow pair The impact of the top planes of hood 1 also reduces rapidly, reduces the risk that hood 1 destroys.

Further, according to bernoulli principle：P₁*V₁/T₁=P₂*V₂/T₂, when the upper air-vent 7 of hood 1 area summation with The area summation ratio of the side wall of guiding region 6 is depressured 3：1000~6：When between 1000, its final air bag is full of the impact velocity of gas It is ideal result of the test between 260 kilometers/hour~320 kilometers/hour.

Preferably, the upper lid 2 includes top and side wall, and the side wall of the upper lid 2 connects with the sidewall weld of hood 1 Connect, the top of the upper lid 2 includes the planar section 10 positioned at middle part and the side plate bending 11 around planar section 10, gas feed On the planar section 10, the side plate bending 11 is smoothly connected by multistage cambered surface to be formed, the upper top outer wall of lid 2 and row The distance between inside top wall of gas hood 1 meets first to reduce what is afterwards increased at side plate bending 11 along the direction of guiding region radius increase Rule, and the top outer wall of the upper lid 2 is with being the first guiding region 5 and drop at the minimum range of the inside top wall of hood 1 Press the line of demarcation of guiding region 6.

Present embodiments provide a kind of concrete structure at the top of upper lid 2, the upper lid 2 positioned at the first guiding region 5 The cambered surface that the cambered surface and radius that side plate bending 11 is 3mm by radius are 10mm is spliced, and the upper lid 2 is located at decompression guiding region The cambered surface that the cambered surface and radius that 6 side plate bending 11 is 17mm by radius are 8mm is spliced.The upper top outer wall of lid 2 and exhaust The minimum range of 1 inside top wall is covered in 2.4mm or so.

Lower cover 3 is positioned at the lower section of upper lid 2, and upper lid 2 and lower cover 3 are welded to connect by friction welding (FW), the shape of lower cover 3 with it is upper Lid 2 is similar, and the gas generation chamber is shaped as structure symmetrical above and below.It is provided with upper lid 2 and the solder side juncture area of lower cover 3 Flash area 12.

Particular embodiments described above, technical problem, technical scheme and the beneficial effect solved to the utility model are entered Further description is gone, should be understood that and the foregoing is only specific embodiment of the utility model, and do not have to In limitation the utility model, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements done Deng should be included within the scope of protection of the utility model.

Claims (2)

1. A kind of 1. gas generator suitable for safe automobile air bag, it is characterised in that：Including hood (1), it is upper lid (2), under Cover (3), the upper lid (2) and lower cover (3) form closed gas generation chamber；The upper lid (2) is located in hood (1), institute The longitudinal section for stating hood (1) is in cap type, the hood (1) have the top that is used for covering on Shang Gai (2) and with upper lid (2) the water conservancy diversion cavity of guiding region is collectively forming, water conservancy diversion cavity is bottomless cylinder, and top is plane, on the upper lid (2) Gas feed is provided with, gases at high pressure enter guiding region by gas generation chamber through the gas feed；The diversion cavity of the hood (1) The guiding region that body is formed with upper lid (2) includes the first guiding region (5) and decompression guiding region (6), and

   First guiding region (5) is used for the high pressure draught even inflation to generation, and the gas of first guiding region (5) passes through Sectional area S1 rate of change be less than 10%；

   Decompression guiding region (6) is used to reduce high pressure draught pressure, the section that the gas for being depressured guiding region (6) passes through Product S2 rate of change is more than 500%；

   The hood (1), which is located in the side wall of decompression guiding region (6), is provided with multiple steam vents (7), and steam vent (7) Area summation is with being depressured the area summation ratio of guiding region (6) side wall 3：1000~6：Between 1000.
2. 2. the gas generator according to claim 1 suitable for safe automobile air bag, it is characterised in that：The upper lid (2) top and side wall are included, the side wall of the upper lid (2) is connected with the sidewall weld of hood (1), the top of the upper lid (2) Portion includes the planar section (10) positioned at middle part and the side plate bending (11) around planar section (10), and gas feed is positioned at described flat In face section (10), the side plate bending (11) is smoothly connected by multistage cambered surface to be formed, described upper lid (2) top outer wall and hood (1) direction that the distance between inside top wall increases at side plate bending (11) place along guiding region radius meets first to reduce what is afterwards increased Rule, and described upper lid (2) top outer wall is with being the first guiding region at the minimum range of hood (1) inside top wall (5) with decompression guiding region (6) line of demarcation.