EROSION SPARK PLUG FOR COMBUSTION CHAMBERS OF POWER AND ENGINE INSTALLATIONS Russian patent published in 2023 - IPC H01T13/20 H01T13/39 H01B1/22 

FIELD: spark plugs for power and propulsion systems.

SUBSTANCE: erosive spark plug is proposed, comprising: a housing with an insulator placed in it with a channel provided with a central electrode, a screen ceramic tube placed in the housing, the end section of which, facing the insulator, is located between the housing and the insulator with formation of external and internal annular channels, a damping winding, a glass-hermetic U-shaped annular bushing, the upper parts of which are placed respectively in the inner and outer channels, an additional glass-tight bushing located between the side surface of the insulator and the housing under the U-shaped glass-hermetic annular bushing. The body in the area of the glass-tight U-shaped annular bushing and the glass-tight bushing is made of steel containing, wt.%: (70÷77.4) Ni, (19÷22) Сr, (2.4-2.8) Ti, (0.6÷1) Al, and in the zone of the insulator the case is made of an alloy containing, wt.%: (48.22÷51) Fe, (32.5÷33.5) Ni, (16.5÷17.5) Со. The contacts of the central and side electrodes are made of a composite material containing a matrix of sintered nickel powder with a dispersion of not more than 250 microns, filled with an alloy of silver and copper, in the ratio, wt.%: (71.5÷72.5) Ag, (27.79÷28) Сu.

EFFECT: increase of tightness and strength of the plugs.

1 cl, 1 dwg