Patent ID: 8084721
Filing Date: 2011-12-27
Classification: H05B,Y10T

Abstract:
1. An electrical heating apparatus comprising: a cylindrical tube having an insertion space with a substantially rectangular cross-section, said insertion space being formed and enclosed by: a fin brazed on an outside surface of at least one of said main body upper wall and said main body lower wall; and an insertion unit housed in said insertion space, said insertion unit comprising: wherein said tube comprises an edge part projecting in the width direction from each of said main body vertical walls to form an edge space therein, said edge space being continuous with said insertion space and has a thickness smaller than a thickness of said insertion unit, said edge part comprising an edge part upper wall, an edge part lower wall, and an edge part vertical wall arranged to have a concave shape; wherein said edge part is configured such that said edge space projects beyond an outside surface of a respective one of said main body vertical walls of said tube; and wherein a width of said main body upper wall, a width of said main body lower wall, and a width of said fin all coincide.