Cooler

Abstract

A cooler includes a plate, a cooling case having a coolant flowing therein, and a plurality of wavy fins having a raised curved portion and a lowered curved portion formed alternately on a side face in a flow direction of the coolant. In this cooler, the coolant flows through between the raised curved portion and the lowered curved portion opposite to each other in a meandering manner. The raised curved portion is provided with a bank creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion. With this bank, a part of a main stream of the coolant can be mixed with the coolant stagnating near the lowered curved portion, whereby the heat transfer coefficient of the wavy fins can be improved. Thus, stagnation of the coolant near the lowered curved portion can be prevented, so that the cooler can have enhanced cooling performance.

1 . A cooler including:
 a plate connected to a semiconductor device;   a cooling case covered with the plate and having a coolant flowing therein; and   wavy fins connected to the plate, each wavy fin having a raised curved portion and a lowered curved portion formed alternately on a side face of the wavy fin in a flow direction of the coolant, the coolant flowing through between the raised curved portion and the lowered curved portion of the adjacent wavy fins opposite to each other in a meandering manner,   wherein the raised curved portion is provided with a stagnation preventing member for creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion, the stagnation preventing member being provided at a base portion of the raised curved portion on a semiconductor device side in a thickness direction of the wavy fins.   
     
     
         2 . (canceled) 
     
     
         3 . The cooler according to  claim 1 , wherein the stagnation preventing member is a tapered bank tapering toward a bottom wall of the cooling case. 
     
     
         4 . The cooler according to  claim 1 , the stagnation preventing member is a protrusion protruding from the raised curved portion toward the opposite lowered curved portion. 
     
     
         5 . The cooler according to  claim 1 , wherein a second stagnation preventing member for creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion is provided, the second stagnation preventing member being positioned at a distal portion of the raised curved portion on a side of the bottom wall of the cooling case in a thickness direction of the wavy fins. 
     
     
         6 . The cooler according to  claim 3 , wherein a second stagnation preventing member for creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion is provided, the second stagnation preventing member being positioned at a distal portion of the raised curved portion on a side of the bottom wall of the cooling case in a thickness direction of the wavy fins. 
     
     
         7 . The cooler according to  claim 4 , wherein a second stagnation preventing member for creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion is provided, the second stagnation preventing member being positioned at a distal portion of the raised curved portion on a side of the bottom wall of the cooling case in a thickness direction of the wavy fins.