Heat exchanger

摘要

An inner fin is provided in a fluid pipe for dividing a fluid passage for heating medium into multiple small fluid passages, so as to facilitate heat exchange between the heating medium and an electronic part. The inner fin is formed in a wave shape in a cross section perpendicular to a flow direction of the heating medium, wherein the inner fin has projecting portions alternately projecting in one direction and in the other direction. The inner fin is composed of multiple fin portions, wherein a fin pitch of a first fin portion is made to be smaller than a fin pitch of a second fin portion, which faces to the electronic part.

主权项

1. A heat exchanger comprising:
a fluid passage forming member for forming therein a fluid passage through which heating medium passes; a physical object attached to an outside or an inside of the fluid passage forming member, wherein heat is exchanged between the heating medium and the physical object; and a plurality of inner fins provided in the fluid passage forming member for dividing the fluid passage into multiple small fluid passages so as to facilitate the heat exchange between the heating medium and the fluid passage forming member, wherein the plurality of inner fins are built up in a multi-layer structure in an arranging direction for arranging the physical object on the fluid passage forming members, wherein fluid resistance for the heating medium in the small fluid passages formed by a first inner fin of the plurality of inner fins, which is closer to the physical object than a second inner fin of the plurality of inner fins, is smaller than fluid resistance for the heating medium in the small fluid passages formed by the second inner fin, wherein each of the inner fins extends in a flow direction of the heating medium, each of the inner fins has plate portions for dividing the fluid passage into small fluid passages and connecting portions for connecting neighboring plate portions to each other, so that the each of the inner fins is formed in a wave shape in the cross section perpendicular to the flow direction of the heating medium, each of the inner fins is formed as a wave-type inner fin, so that the plate portions are curved in a wave form in the flow direction of the heating medium, when viewed in the arranging direction, and a wave depth of the first inner fin, which is closer to the fluid passage forming member than the second inner fin, is smaller than a wave depth of the second inner fin, wherein a wave depth is defined as a dimension of the wave form of the plate portion in an amplitude direction, which is measured in a cross section perpendicular to the arranging direction and crossing centers of the small fluid passages in the arranging direction.