Patent ID: 7640765

Claim:
A portable cooling device comprising a vacuum bottle having an outer casing having an outer wall; and a chamber; a vacuum flask being mounted inside the chamber of the outer casing and being separated from the outer casing by a vacuum space; an outlet being formed on and protruding through the outer casing and communicating with the vacuum flask; and an inlet being formed on and protruding through the outer casing and communicating with the vacuum flask; a pump being mounted on the outer casing and connecting to the outlet; an outflow pipe being connected to the pump and having an outflow end; and a check valve being mounted in the outflow pipe; a thermal exchanger connecting to the outflow pipe and having an inner cavity being formed in the thermal exchanger; an inlet hole being formed through the thermal exchanger, communicating with the inner cavity of the thermal exchanger and connecting to the outflow end of the outflow pipe; and an outlet hole being formed through the thermal exchanger and communicating with the inner cavity of the thermal exchanger; and a return pipe connecting between the outlet hole of the thermal exchanger and the inlet of the vacuum bottle.