Pyrotechnic gas generator for airbag

Abstract

The invention relates to the technical field of gas generators and relates to a pyrotechnic gas generator for an airbag. A filter adopts a design mode with the same height as an upper shell; a lower shell is of a double-cup-body structure; the lower shell is provided with a first cup body and a second cup body; the filter is arranged in the first cup body; the upper shell is connected to an opening of the first cup body of the lower shell; an igniter base is arranged on the bottom surface of the lower shell; an igniter is arranged in the igniter base; an ignition shell is connected to the igniter base; the ignition shell is provided with at least one ignition hole; and a mesoporous columnar gas production initiation power sheet of which the major axis radius-to-minor axis radius ratio is larger than 1 is arranged in a gas production initiation power chamber. Compared with the prior art, the pyrotechnic gas generator improves the filter efficiency of the filter and meanwhile, reduces the output slope of the initial pressure of the pyrotechnic gas generator.

Description

technical field [0001] The invention relates to the technical field of gas generators, in particular to a pyrotechnic gas generator for safety airbags. Background technique [0002] Gas generators are a key component in the field of automotive passive safety. The structure of the traditional gas generator generally adopts a filter built into the cup-shaped lower shell. The filter is molded by low-carbon steel wire. The lower shell is embedded with an igniter seat. The ignition shell, the igniter seat, the upper shell, the lower shell, and the filter form a gas-generating drug chamber, and the gas-generating drug chamber is generally equipped with a cylindrical gas-generating drug, such as figure 2 shown. [0003] This kind of pyrotechnic gas generator with a cup-shaped lower shell, because the gas flow has the flow characteristic of tending to the exhaust port, the filter screen of the traditional structure gas generator is approximately equal to the height of the generato...

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Problems solved by technology

[0003] This kind of pyrotechnic gas generator with a cup-shaped lower shell, because the gas flow has the flow characteristic of tending to the exhaust port, the filter screen of the traditional structure gas generator is approximately equal to the height of the generator, and the exhaust hole design of the traditional structure generator On the upper casing, due to the above-mentioned characteristics of gas fluidity, only the filter part highly overlapped with the upper casing plays the role of filtering the residue generated by the combustion of the gas-generating chemical, so the filter loses part of the power, which is not conducive to the small size of the gas generator lightweight

[0004] Because the utilization rate of the filter is not high, if the gas purity is improved, the weight of the filter needs to be increased, resulting in a large and heavy size and weight of the entire gas generator

In addition, the gas-generating chamber of the existing pyrotechnic gas generator is filled with cylindrical gas-generating medicines. When the ignition powder acts on the gas-generating medicines, all the gas-generating medicines are ignited at one time, and the gas-generating medicines burn without stages, resulting in pyrotechnic The initial slope output of the pyrotechnic gas generator is too high, and the initial slope is too high, which has a great impact on the pyrotechnic gas generator, which may easily cause the gas generator to fail

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