FIELD: gas-turbine and jet engines. SUBSTANCE: spark-forming insulator is anchored in main body between its end face part and metal bushing. Bushing is attached to inner surface of main body and is manufactured from material having thermal coefficient of expansion greater than that of material of part of main body over section between bushing and face surface of semiconductor element of spark-forming insulator. Stem of sealing insulator has certain length of the part that bulges out of seal embracing sealing insulator. EFFECT: improved operational characteristics. 3 dwg
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