Patent ID: 7571759

Claim:
A stacked type cooler for cooling a plurality of electronic components from two surfaces of each component, including a plurality of cooling tubes having a flat shape and coolant flow passages for allowing a coolant to flow, and a connecting pipe for connecting said plurality of cooling tubes, wherein: said plurality of cooling tubes are arranged and stacked in such a fashion as to interpose said electronic components between said cooling tubes and include two outside cooling tubes arranged at both ends in a stacking direction and a plurality of inside cooling tubes arranged between said two outside cooling tubes; each of said inside cooling tubes includes at least a first coolant flow passage facing a first tube wall having a first main surface in contact with one of said electronic components and a second coolant flow passage facing a second tube wall having a second main surface in contact with another one of said electronic components on the opposite side to said first main surface, and said coolant flow passages are formed in two or more stages in a direction of thickness of said inside cooling tube; each of said inside cooling tubes has an inner fin for partitioning said coolant flow passages into a plurality of zones in a direction intersecting at right angles to the direction of thickness of said inside cooling tube; each of said inside cooling tubes includes a pair of outer shell plates constituting said first tube wall and said second tube wall, an intermediate plate interposed between said pair of outer shell plates and said inner fin has a corrugation shape and is interposed between said intermediate plate and said outer shell plate, and said first coolant flow passage and said second coolant flow passage are formed between said intermediate plate and said outer shell plates, respectively; each of the first and second coolant flow passages have an upper stream side inner fin disposed at an upper stream side of the coolant flow and a lower stream side inner fin disposed at a lower side of the coolant flow; and a gap is formed between the upper stream side inner fin and the lower stream side inner fin in a coolant flow direction.