Kamiya, Sadayuki; Matsuura, Satoshi; Nakamura, Mitsugu; Baba, Norimasa; Torigoe, Eiichi; Kameoka, Teruhiko; Yamamoto, Ken; Yamamoto, Michiyasu; Sanada, Ryouichi;

Heat exchanger

A header has a tank member having a transverse cross-section of a circular arc shape, and a tube attachment member having a transverse cross-section flatter than the above-mentioned circular arc shape as a whole, are opposed and joined. The tube attachment member has identical curvature portions constituted with an inner diameter R2 which is the same as the inner diameter R2 of the tank member at both sides to be joined to the tank member, and has a large curvature portion constituted with an inner diameter R1 which is larger than the inner diameter R2 of the tank member at an intermediate portion interposed between the identical curvature portions. A connecting position P between the identical curvature portion and the large curvature portion is inside from both edges of a tube.

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What is claimed is:

1. A heat exchanger, comprising;

a pair of headers constituted by a longitudinal tank member which has a transverse cross-section having a predetermined curvature and a tube attachment member which is joined in the longitudinal direction opposing to the tank member; and

a tube communicating between the headers to allow a refrigerant flowing therethough,

the tank member being provided with

(a) a brazing material layer provided at least at a joining face with respect to the tube attachment member, and

(b) a plane portion formed at an inner peripheral face adjacent to the joining face with respect to the tube attachment member,

the tube attachment member being provided with

(a) a brazing material layer provided at least at a joining face with respect to the tank member,

(b) a plane portion formed at an inner peripheral face adjacent to the joining face with respect to the tank member,

(c) a first curvature portion which is formed in the vicinity of the joining face with respect to the tank member and has a predetermined curvature, and

(d) a second curvature portion which is formed at a central portion interposed between both sides by the first curvature portion and has a curvature larger than that of the curvature portion of the tank member, and

a connecting position between the first curvature portion and the second curvature portion of the tube attachment member being positioned inside of an attachment region of the tube to be attached to the tube attachment member.

2. The heat exchanger according to claim 1, wherein the first curvature portion of the tube attachment member has approximately the same curvature as that of a curvature portion of said tank member.

3. The heat exchanger according to claim 1, wherein the tube is formed with a plurality of fluid passages at its interior, and the fluid passages have circular transverse cross-sectional shapes.

4. The heat exchanger according to claim 1, further comprising;

inner fins for forming a plurality of fluid passages in the tube, the inner fins being inserted into the tube such that the fluid passages have an inclination of a predetermined angle with respect to the longitudinal direction of said tube.

5. The heat exchanger according to claim 4, wherein the inner fin has plurality of communication holes which are provided at wall faces of said adjoining fluid passages so as to allow said fluid passages to communicate in the longitudinal direction of the tube respectively.