Patent ID: 7044208
Filing Date: 2006-05-16
Classification: F25B,F28D,F28F

Abstract:
1. A heat exchanger comprising: a plurality of tubes stacked on each other; and a pair of header tanks, each header tank having a flow section in which fluid flows, extending in a direction of stack of the tubes, wherein both end sections of the tubes in the longitudinal direction are joined to the pair of header tanks, the flow section of each header tank and the inside of each tube are communicated with each other, a tip position (a) of the tube end section is arranged in an outside region of the flow section, an inner wall width size (b) of the flow section is smaller than a size (c) in the width direction of the header tank at the tube end section; the header tank comprises a tank section in which the flow section is formed and a plate section to which the tube end section is joined, the header tank is provided with communicating sections which communicate between the flow section and the tube end sections, the tank section is provided with the flow section formed in a groove shape and side surfaces extending in the width direction of the header tank from the groove, the plate section is provided with a plurality of expanding sections to which the tube end sections are joined respectively and a plurality of valley sections between adjacent expanding sections, the expanding sections being expanded to the side opposite to the tank section side and being arranged in parallel to each other, the expanding section defining the communicating section therein, and the valley sections extending in the width direction of the header tank and being joined with the side surfaces of the tank section to define the communicating sections as channels extending in the width direction of the header tank from the flow section.