Patent ID: 7383693

Claim:
A cooling device comprising: a supplying line for flowing a refrigerant to be supplied to an object of cooling; a recovery line for flowing the refrigerant returned from the object of cooling; a pump installed between the recovery line and the supplying line, for feeding the refrigerant into the supplying line; a heat exchanger installed in the middle of either the supplying line or the recovery line, for cooling the refrigerant to be supplied to the object of cooling, to temperature not higher than that for freezing the moisture dissolving in the refrigerant; a refrigerator for cooling the heat exchanger; a branch line with one end thereof communicating with the supplying line, and the other end communicating with the recovery line, wherein a part of the refrigerant supplied to the supplying line by the pump, flows as a branch; a heater installed in the middle of the branch line, for heating up the refrigerant to temperature higher than that for freezing the moisture dissolving in the refrigerant; and a moisture adsorption filter installed in the middle of the branch line, through which the refrigerant heated by the heater passes, for adsorbing moisture mixed in the refrigerant.