Patent ID: 9726439
Date: 2017-08-08
CPC Classifications: B23K,F28D,F28F

Claim:
1. A tube used for a heat exchanger, the tube including therein a flow passage and having a flattened shape in cross section, the tube comprising: a curved end portion in which an elongated plate member is curved; a pair of flat plate portions connected to the curved end portion and disposed to face each other; a pair of inclination portions extending inward from the pair of flat plate portions to be inclined with respect to the pair of flat plate 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, wherein the one of the pair of inclination portions includes a first curved part having a curved shape and being directly connected to one of the pair of flat plate portions, a second curved part having a curved shape and being directly connected to the long end part of the fixed portion, and a connection part being located between the first curved part and the second curved part and connecting the first curved part and the second curved part, and a non-zero inclination angle of at least one part of the other of the pair of inclination portions is larger than a non-zero inclination angle of the connection part of the one of the pair of inclination portions with respect to a center line bisecting a distance between the pair of flat plate portions.