SEMICONDUCTOR SPARK-PLUG FOR GAS-TURBINE Russian patent published in 1995 - IPC

FIELD: power engineering. SUBSTANCE: invention refers to spark-plug of surface discharge for gas-turbine and jet engines. Spark-plug has basic tubular case, screen ceramic tube, insulator fixed in basic case on side of screen ceramic tube with copper wedge bushing. It faces screen ceramic tube with bigger cross-section. Ring glass sealant is placed on copper wedge bushing in circular clearance formed by leg of insulator and basic case. Spark-plug also includes conductive rod with contact head fixed by means of glass sealant in internal channel of insulator, additional insulator with semiconductor element which internal channel houses central electrode fixed with glass sealant, ceramic insulating tube, thermal compensation element soldered to conductive rod and central electrode, additional case with thread forming working butt of spark-plug. Its internal space houses partially basic case hermetically welded in additional case above thread. Heat insulation ring space is made in zone beneath thread between cases. EFFECT: increased thermal resistance with simultaneous prolongation of service life, facilitated manufacture. 1 dwg