Electric resistance heater unit assembly.

摘要

A heater unit assembly for annealing a reactor vessel, the vessel having an interior wall and being open at the top, and the assembly being constructed to be inserted into the vessel. The assembly is composed of: a support structure including a top plate (6) dimensioned to rest on the top of the vessel and a hollow cylindrical body (2,4) which is open at the top and closed at the bottom, the body (2,4) being secured to the top plate (6) to extend downwardly therefrom and having a configuration at least approximately conforming to that of the vessel and having an outer surface which faces the interior wall of the vessel when the assembly is inserted in the vessel; a plurality of electrical resistance heater units (14,16,18) mounted on the body (2,4) and projecting from the outer surface of the body (2,4) to face the interior wall of the vessel when the assembly is inserted in the vessel, the heater units (14,16,18) being distributed uniformly across the outer surface for effecting uniform heating of the vessel; andelectrical power conductors (86,90) extending through the top plate (6) to the interior of the body (2,4) and conductively connected to the heater units (14,16,18).