FIELD: electricity.
SUBSTANCE: invention relates to nozzles for head of plasma-arc torch with liquid cooling. Nozzle comprises housing with common axial length L, inner surface and outer surface, with front and rear ends and nozzle opening at front end, wherein the outer surface of the housing, based on the rear end, has a substantially cylindrical first section with an axial length L1, on which the housing rear end is located, stretching, primarily, in circumferential direction groove for ring of round section or with ring of round section located in it, which in direction of rear end of housing is limited by ledge, which sets outer diameter D11 of housing, and on the front end there is a centring surface for the nozzle holder, which sets the outer diameter D12 of the housing, and the second portion adjoining it in the direction of the front end, which sets the axial thrust surface for the nozzle holder at the boundary with the first portion, which defines the outer diameter D21 of the body and, at least in the partial portion, substantially conically converges to the front end of the body.
EFFECT: technical result is preventing or at least reducing the damage of the ring of the round section when the nozzle is inserted into the nozzle holder, while providing a larger area which can come into contact with the cooling liquid.
25 cl, 6 dwg
