Liquid-cooled-type cooling device

Abstract

A liquid-cooled-type cooling device includes a casing having a cooling-liquid flow channel. Fins are provided on an inner surface of a top wall of the casing. Each fin has a wavy shape on a horizontal plane perpendicular to a fin height direction. In a left fin of two adjacent fins, lines of intersection between the horizontal plane and right side surfaces of two slant portions connecting two adjacent wave crest portions and a wave trough portion therebetween intersect each other at a first point located on a first straight line. In a right fin, lines of intersection between the horizontal plane and left side surfaces of two slant portions connecting two adjacent wave trough portions and a wave crest portion therebetween intersect each other at a second point located on a second straight line. The first straight line is located on the right fin side of the second straight line.

1 . A liquid-cooled-type cooling device comprising a casing which has a top wall, a bottom wall, and a peripheral wall, which has a cooling-liquid inlet and a cooling-liquid outlet formed thereon, and in which a cooling-liquid flow channel is provided between the cooling-liquid inlet and the cooling-liquid outlet, wherein
 a plurality of fins projecting into the cooling-liquid flow channel and extending in a flow direction of cooling liquid within the cooling-liquid flow channel are provided on an inner surface of a portion of a wall selected from the top wall and the bottom wall of the casing onto which a heat-generating body is attached such that the heat-generating body is in contact with an outer surface of the selected wall, the potion of the selected wall facing the cooling-liquid flow channel, and the plurality of fins being spaced from one another in a width direction of the cooling-liquid flow channel;   each of the fins has a wavy shape as viewed on a cross section taken along a horizontal plane perpendicular to a height direction of the fins, and has wave crest portions and wave trough portions alternately formed thereon; and   the fins are configured and arranged such that the cooling liquid flows between two adjacent fins while meandering.   
     
     
         2 . A liquid-cooled-type cooling device according to  claim 1 , wherein a first fin of two adjacent fins is configured such that two lines of intersection formed between the horizontal plane and second-fin-side surfaces of two slant portions connecting two adjacent wave crest portions and a wave trough portion located therebetween intersect each other at a point located on a first straight line; a second fin of the two adjacent fins is configured such that two lines of intersection formed between the horizontal plane and first-fin-side surfaces of two slant portions connecting two adjacent wave trough portions and a wave crest portion located therebetween intersect each other at a point located on a second straight line; and the first straight line and the second straight line coincide with each other or the first straight line is located on a side toward the second fin in relation to the second straight line. 
     
     
         3 . A liquid-cooled-type cooling device according to  claim 2 , wherein the wave crest portions and the wave trough portions of each fin are rounded; and, as viewed on the horizontal plane, the point at which the two lines of intersection between the horizontal plane and the second-fin-side surfaces of the two slant portions intersect each other is located at a position at which imaginary lines extending toward the second fin from the second-fin-side surfaces of the two slant portions intersect each other. 
     
     
         4 . A liquid-cooled-type cooling device according to  claim 2 , wherein the wave crest portions and the wave trough portions of each fin are made flat; and, as viewed on the horizontal plane, the point at which the two lines of intersection between the horizontal plane and the second-fin-side surfaces of the two slant portions intersect each other is located at a position at which imaginary lines extending toward the second fin from the second-fin-side surfaces of the two slant portions intersect each other. 
     
     
         5 . A liquid-cooled-type cooling device according to  claim 2 , wherein the first fin of two adjacent fins is configured such that the two lines of intersection formed between the horizontal plane and the second-fin-side surfaces of two slant portions connecting two adjacent wave trough portions and a wave crest portion located therebetween form an angle of 110 to 150 degrees therebetween; and the second fin of the two adjacent fins is configured such that the two lines of intersection formed between the horizontal plane and the first-fin-side surfaces of two slant portions connecting two adjacent wave crest portions and a wave trough portion located therebetween form an angle of 110 to 150 degrees therebetween. 
     
     
         6 . A liquid-cooled-type cooling device according to  claim 2 , wherein two adjacent fins have a spacing of 0.5 mm or greater therebetween. 
     
     
         7 . A liquid-cooled-type cooling device according to  claim 1 , wherein two adjacent fins are connected together at their upper end portions or lower end portions via a connection portion, and a plurality of the connection portions are provided alternately at upper and lower end portions of all the fins, whereby all the fins and the connection portions constitute a fin unit; and the connection portions on the upper side of the fin unit are joined to the top wall of the casing, and the connection portions on the lower side of the fin unit are joined to the bottom wall of the casing.