Patent ID: 7539009

Claim:
A cooling unit comprising: a heat receiving portion which is thermally connected to a heat generating component; a heat radiating portion which radiates heat from the heat generating component; and a circulation path through which liquid coolant is circulated between the heat receiving portion and the heat radiating portion, wherein the heat radiating portion has: an impeller which expels cooling air in a radial direction from an outer circumference thereof; a heat-radiating member which includes a coolant passage in which the liquid coolant flows, and a plurality of heat-radiating fins thermally connected to the coolant passage, the coolant passage being provided downstream of the impeller with respect to flow of the cooling air and surrounding the outer circumference of the impeller, the cooling air expelled from the outer circumference of the impeller flowing between the heat-radiating fins to cool the heat-radiating member; and a case which contains the impeller and the heat-radiating member and which has at least one outlet port through which the cooling air is expelled after cooling the heat-radiating member.