Showa Denko K.k.

Hiroyuki Sudo

Takashi Hirayama

Takashi Yabe

Hirosaburo Hirano

A heat exchanger includes a pair of header tanks, a plurality of flat heat exchange tubes which are disposed between the two header tanks and whose opposite end portions are connected to the corresponding header tanks, and a plurality of corrugate fins each including wave crest portions, wave trough portions, and connection portions connecting together the corresponding wave crest portions and wave trough portions, and each disposed between the adjacent heat exchange tubes. Each connection portion has a plurality of louvers which extend in a width direction of the connection portion and are arranged in a longitudinal direction of the connection portion. The louver pitch is 0.4 mm to 0.8 mm. The inclination angle of the louvers in relation to the connection portion is 20&#xb0; to 30&#xb0;.

Heat exchanger

Each header tank includes a tank body and a header plate. The tank body includes a top wall, shorter side walls, and longer side walls. Each shorter side wall has joining portions integrally formed via rounded connection portions and extending along the inner surfaces of the longer side walls. The header plate includes a closure wall, shorter side walls, and longer side walls. End portions of each longer side wall of the tank body are curved along the rounded connection portions to form first bent portions. End portions of each longer side wall of the header plate are curved along the first bent portions to form second bent portions. The shorter side walls of the header plate have deformation portions which enter recesses formed between the rounded connection portions of the tank body and tip end surfaces of the first bent portions.

Growing community of inventors

Oyama, Japan

Hiroyuki Sudo