Method for controlling the burning pressure in a preinflator, preinflator per se and hybrid gas generator incorporating such a preinflator
First Claim
1. A method for controlling, without moving parts during operation, a burning pressure of a pyrotechnic composition used in a hybrid gas generator, the method comprising:
- providing a pressure vessel containing a pressurized gas comprising oxygen therein;
arranging, within the pressure vessel, a combustion chamber containing the pyrotechnic composition;
sealing a plurality of gas discharge openings between the combustion chamber and the pressure vessel, wherein each of the plurality of sealed gas discharge openings are dimensioned and designed to rupture in response to different burning pressures within the combustion chamber;
controlling the burning pressure in the combustion chamber so that it does not exceed a predetermined value by progressively rupturing one or more of the plurality of sealed gas discharge openings;
passing a combustion gas from the combustion chamber to the pressure vessel through one or more of the gas discharge openings, wherein, by controlling the burning pressure, a burning rate of the pyrotechnic composition is made to be independent of an ambient temperature.
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Accused Products
Abstract
The present invention relates to a method and a device for making the combustion of a pyrotechnic compostion independent of the ambient temperature when combusting a pyrotechnic composition in a preinflator or combustion chamber (2) incorporating outlets but being otherwise enclosed. As claimed in the present invention this is enabled by controlling the burning pressure of the pyrotechnic composition so that it does not exceed a predetermined value. The characteristic feature of the present invention is that the preinflator (2), in which combustion of the pyrotechnic composition takes place, incorporates a plurality of gas discharge perforations (6–9) or outlets, each of which is initially sealed by a bursting disc or foil seal (10) that is designed to rupture when the said burning pressure in the combustion chamber (2) is exceeded.
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Citations
7 Claims
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1. A method for controlling, without moving parts during operation, a burning pressure of a pyrotechnic composition used in a hybrid gas generator, the method comprising:
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providing a pressure vessel containing a pressurized gas comprising oxygen therein; arranging, within the pressure vessel, a combustion chamber containing the pyrotechnic composition; sealing a plurality of gas discharge openings between the combustion chamber and the pressure vessel, wherein each of the plurality of sealed gas discharge openings are dimensioned and designed to rupture in response to different burning pressures within the combustion chamber; controlling the burning pressure in the combustion chamber so that it does not exceed a predetermined value by progressively rupturing one or more of the plurality of sealed gas discharge openings; passing a combustion gas from the combustion chamber to the pressure vessel through one or more of the gas discharge openings, wherein, by controlling the burning pressure, a burning rate of the pyrotechnic composition is made to be independent of an ambient temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification