| CPC H05K 7/20263 (2013.01) [F28F 13/08 (2013.01); H05K 7/2039 (2013.01)] | 10 Claims |
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1. A heat exchanger configured to exchange heat between a heat medium, which is conducted in a heat medium flow passage, and an electronic component, the heat exchanger comprising:
a plurality of fins that are placed in the heat medium flow passage, wherein the plurality of fins are spaced from each other and are arranged in a predetermined direction, which is defined as a fin arrangement direction, to divide the heat medium flow passage into a plurality of narrow passages, wherein:
the heat medium flow passage extends in a passage longitudinal direction which is a direction that intersects the fin arrangement direction;
each of the plurality of fins includes a plurality of thick wall portions and a plurality of thin wall portions which are alternately arranged along a whole or a portion of the fin in the passage longitudinal direction, wherein a plate wall thickness of each of the plurality of thick wall portions is relatively large, and a plate wall thickness of each of the plurality of thin wall portions is relatively small;
each adjacent two of the plurality of fins, which are adjacent to each other, are respectively defined as one fine and another fin, and each of the plurality of thick wall portions of the one fin is opposed to an adjacent one of the plurality of thin wall portions of the another fin in the fin arrangement direction, and each of the plurality of thin wall portions of the one fin is opposed to an adjacent one of the plurality of thick wall portions of the another fin in the fin arrangement direction;
each of the plurality of fins has a communication passage that communicates between:
one of the plurality of narrow passages located along one surface of the fin; and
another one of the plurality of narrow passages located along another surface of the fin;
the communication passage is one of a plurality of communication passages that are arranged at a predetermined interval in the passage longitudinal direction in each of the plurality of fins;
each of the plurality of fins includes a plurality of fin pieces each of which is located between adjacent two of the plurality of communication passages of the fin;
in each of the plurality of fins, each of the plurality of fin pieces is shaped in an elongated form, wherein a length of each of the plurality of fin pieces measured in the passage longitudinal direction is larger than a length of each of the plurality of fin pieces measured in the fin arrangement direction;
each of the plurality of fin pieces of each of the plurality of fins is configured to satisfy the following equation:
(Lp−d1)/Lp≤−0.306(d2/Wp)2+0.4324(d2/Wp)+0.1298,
where:
d1 denotes a width of each of the plurality of fin pieces measured in the passage longitudinal direction in each of the plurality of fins;
Lp denotes a distance measured in the passage longitudinal direction between a center of one of adjacent two of the plurality of fin pieces and a center of another one of the adjacent two of the plurality of fin pieces in each of the plurality of fins, wherein a corresponding one of the plurality of communication passages is interposed between the adjacent two of the plurality of fin pieces;
d2 denotes a width of each of the plurality of fin pieces measured in the fin arrangement direction in each of the plurality of fins; and
Wp denotes a length that is twice longer than a fin pitch which is an interval of the plurality of fins in the fin arrangement direction.
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