Electro-pyrotechnic initiator

Abstract

The invention relates to an electro-pyrotechnic initiator comprising a pyrotechnic charge (6) provided with at least one composition, and a plastic housing (1) with two substructures. The first substructure (2) comprises a plastic wall (4) which is fixed to a plastic base (5) so as to form a container. The second plastic substructure (3) has a main axis and is penetrated in the direction of said axis by at least two pins (11, 12) which are connected to each other on one surface (14) of said substructure (3) via a electrical bridge (13). Said surface (14) is symmetrically hollow along a height H and a width L. The second substructure (3) forms a base. The first (2) and second (3) substructures are joined in an air-tight manner by means of ultrasonic welding.

Description

technical field [0001] The invention relates to an electric pyrotechnic detonator. Background technique [0002] There are two types of detonators. The first type uses a "glass-to-metal seal" type insert and the second type of detonator uses a "plastic" type insert or seal. Type I detonators are generally considered to be airtight and to ensure that their pyrotechnic compounds and / or explosives are not affected by harsh environments, especially humidity. However, it is well known that glass-to-metal seals are essential for the different steps (crimping, welding, etc.) ) are sensitive to thermal and mechanical stresses. [0003] Furthermore, even though the use of a "glass-to-metal seal" insert initially guarantees a hermetic barrier of the insert along the current input pin, it is not always effective for the connection between the insert and the pyrotechnic vessel. [0004] Detonators using plastic seals have issues with airtightness due to the type of plastic material ...

AI Technical Summary

Problems solved by technology

[0003] Furthermore, even though the use of a "glass-to-metal seal" insert initially guarantees a hermetic barrier of the insert along the current input pin, it is not always effective for the connection between the insert and the pyrotechnic vessel

[0004] Detonators using plastic seals have issues with airtightness due to the type of plastic material used (e.g. moisture sensitive polyamide) or weak internal joints (e.g. pinched, glued, etc.)

[0005] Finally, existing detonators, regardless of the type described above, generally include several assembly parts, thereby increasing the cost of the device

The first type of detonator is rather expensive due to the necessity to prepare (surface treatment, etc.) said "glass-to-metal" seal

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