Cooling device

A cooling device for cooling a power semiconductor device, the cooling device comprising:

• a tank configured to accommodate the power semiconductor device;
• insulating oil;
• and
• a refrigerant liquid having a boiling point temperature lower than a boiling point temperature of the insulating oil and a specific gravity larger than a specific gravity of the insulating oil, wherein
• the insulating oil and the refrigerant liquid are stored in the tank in a mixed state to cool the power semiconductor device, and
• in the cooling of the power semiconductor device, vaporization heat cooling is performed using the refrigerant liquid, wherein
• the refrigerant liquid is a fluorine-based refrigerant,
• the tank includes a first housing portion, a second housing portion, and a seal member that seals between the first housing portion and the second housing portion coupled to each other, and
• the seal member is provided within a range in a height direction in which the insulating oil is stored in accordance with the specific gravity.

A cooling device for cooling a power semiconductor device, the cooling device comprising:

• a tank configured to accommodate the power semiconductor device;
• insulating oil;
• and
• a refrigerant liquid having a boiling point temperature lower than a boiling point temperature of the insulating oil and a specific gravity larger than a specific gravity of the insulating oil, wherein
• the insulating oil and the refrigerant liquid are stored in the tank in a mixed state to cool the power semiconductor device, and
• in the cooling of the power semiconductor device, vaporization heat cooling is performed using the refrigerant liquid, wherein the cooling device further comprising:
• a sub-tank having an air chamber;
• a communication passage configured to allow the air chamber to communicate with an inside of the tank;
• and
• a shielding plate or a pipe member provided around an opening of a through hole of the communication passage that penetrates a side wall of the tank on an inner surface of the side wall and configured to prevent the refrigerant liquid from entering the sub-tank from the tank.