Denso Corporation

Norio Yoshida

Tatsuo Ozaki

Kazuhiro Mitsukawa

Toshihide Ninagawa

Masahiro Omae

Hiroyasu Shimanuki

Mitsuyoshi Saito

Noriyuki Miyazaki

U Ou

Tetsuya Sakakibara

Takahide Oohara

A tube used in a heat exchanger, wherein a tube body includes a curved end portion, a pair of parallel portions, a pair of inclination portions, and a fixed portion in which a long end part extending from one of the pair of inclination portions is bent to hold therebetween a short end part extending from the other of the pair of inclination portions, and the tube is a pipe member having a flattened shape in cross-section. Poor brazing is reduced by making the inclination angle of at least part of the other inclination portion with respect to the flat plate portion larger than that of the one inclination portion.

Tube and heat exchanger provided with tube

A heat exchanger has a flat tube () having a curved portion (). A part of the curved portion () is formed by overlapping an outer rim () on an inner rim (). The inner rim () has a small curvature region (). The small curvature region () is inclined to a flat plate portion (), and is defined by a radius larger than a difference between a half of a thickness of the flat tube () and a thickness of the outer rim (). The small curvature region () is not beyond a center line (C) in a thickness of the flat tube (). The outer rim () extends beyond the center line (C). The outer rim () has an end face () placed on the small curvature region (). The flat tube () has flared portions () expanded at insertion holes ().

Heat exchanger

Growing community of inventors

Kariya, Japan

Norio Yoshida