| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrical heater apparatus ensuring contact pressure between a tube and an ohmic heat-generating element and heat transfer performance between the tube and a fin with no use of an energizing member to improve heat generating performance of the ohmic heat-generating element, by pressure-forming the tube after brazing the fin thereto to ensure the contact pressure between the tube and the ohmic heat-generating element without overloading the ohmic heat-generating element. SOLUTION: The electrical heater apparatus has the fin 12 brazed to a body upper wall 111 and a body lower wall 112 of the tube 11, an insertion unit 20 having the ohmic heat-generating element 22 pressure-welded to the body lower wall 112 and an edge part 114 projected in the width direction from a body vertical wall 113 of the tube to form an edge space 11b. The edge space 11b is formed so as to be continuous with the insertion space 11a and is smaller in thickness dimension than the thickness dimension of the insertion unit 20. The edge part 114 has an edge part upper wall 114a, an edge part lower wall 114b and an edge part vertical wall 114c disposed in a concave shape. COPYRIGHT: (C)2009,JPO&INPIT
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