A miniaturized gas generator

Abstract

A miniaturized gas generator, the main body of which is composed of an upper shell and a lower shell that are pressed together up and down. There are a combustion chamber and an ignition chamber in the main body; a base installed in the center hole of the bottom of the lower shell is located in the ignition chamber, The ignition shell installed on the base, the electric detonator installed in the inner hole of the base, and the flake powder placed in the ignition shell; there is a fire transmission hole on the annular peripheral surface of the ignition shell; the annular peripheral surface of the upper shell There is an exhaust hole; the inside of the exhaust hole is pasted with metal foil; the combustion chamber is surrounded by the inner wall of the filter screen, the outer wall of the ignition shell, the combustion chamber cover and the cushion; the gas-producing medicine is installed in the combustion chamber; the filter screen is Stepped cylindrical structure; the small stage of the filter screen is inserted into the lower shell; the outer wall of the small stage of the filter screen and the inner wall of the lower shell form an annular lower air flow channel; the outer wall of the large stage of the filter screen and the inner wall of the upper shell form an annular upper Airflow channel. The invention can reduce the initial output slope, improve the assembly efficiency and realize the miniaturization of the generator.

Description

technical field [0001] The present invention relates to a miniaturized gas generator for an automobile safety airbag system. Background technique [0002] Gas generators are widely used in automotive passive safety systems. When an accident occurs, it can effectively reduce the damage to the human body and protect the lives of the occupants. At present, there are many different forms of gas generators, mainly including pyrotechnic gas generators, compressed gas generators and hybrid gas generators. [0003] The gas generator is the core component in the airbag module. Such as figure 1 , figure 2 , the existing pyrotechnic gas generator structure mostly adopts a filter screen in a cup-shaped lower shell with a closed end and a cylindrical wall formed by stamping a metal plate. The filter screen is cylindrical with a certain thickness. A metal plate ferrule with multiple openings is nested on the outer side of the lower shell, and a cylindrical opening with a certain heig...

AI Technical Summary

Problems solved by technology

[0004] The pyrotechnic gas generator with this structure has a low space utilization rate. The diameter of the entire generator is Ф70mm, the weight is 500g, the gas production is only 0.9mol, and the maximum working pressure is 190kPa; in addition, the existing pyrotechnic gas The generator’s fire transfer powder is mostly granular, which needs to be sealed for the fire transfer hole, and it is easy to cause the initial output slope of the generator to be too high, which has a large impact on the airbag module and is likely to cause failure; a metal protective cover needs to be added to the outside of the filter , increase the cost; set up two automatic gunpowder, the assembly workload is heavy

The entire structure does not take advantage of generator miniaturization and cost reduction requirements

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