Igniter for gun liquid propellant or jet engine fuel - has outer tubular conductor spaced from inner conductor by irregular granules of insulating material

摘要

The igniter comprises an outer tube (52) an inner rod (54) a volume (56) of irregular tightly packed together particle spacing the rod concentrically within the tube, except proximal to the face (58) of the bolt, wherein a void (60) to serve as a spark chamber is provided between the tube (52) and the rod (54). The tube (52) is made of stainless steel, the rod (54) of stainless steel wire, and the insulating material (56) is magnesium oxide power. The annuals (62) is a hard fired ceramic bead. The seals (63) around the annular (62) are made of a resilient material which is not soluble in the particular propellant or fuel which is to be ignited, e.g. fluorocarbon elastomer. The igniter is rigid and permits no relative movement of its internal elements. The pressure pulses apply extremely high pressure on the surface and interior interfaces of the volume of powder. No give or movement of the outer tube or internal elements is permitted.