Rankine cycle device, expansion system and expansion machine

An expansion system comprising:

• an expansion machine comprising:
• an expansion mechanism for extracting a power from a working fluid heated by a heater,
• an electric power generator connected to the expansion mechanism,
• a sealed container containing the expansion mechanism and the electric power generator,
• a first inlet for supplying the working fluid to the expansion mechanism,
• a first outlet for draining the working fluid from the expansion mechanism to an outside of the sealed container,
• a second inlet for supplying, to an inside of the sealed container, the working fluid having a lower temperature than that of the working fluid at the first outlet, and
• a second outlet for draining, to the outside of the sealed container, the working fluid supplied from the second inlet;
• a cooling path having a cooler comprising a heat exchanger for cooling the working fluid drained from the first outlet, the cooling path connecting the first outlet to the second inlet, and
• the second inlet and the second outlet are connected to the electric power generator of the sealed container.

An expansion machine comprising:

• an expansion mechanism for extracting a power from a working fluid heated by a heater;
• an electric power generator connected to the expansion mechanism;
• a sealed container containing the expansion mechanism and the electric power generator;
• a first inlet for supplying the working fluid to the expansion mechanism;
• a first outlet for draining the working fluid from the expansion mechanism to an outside of the sealed container;
• a second inlet for supplying, to an inside of the sealed container, the working fluid having a lower temperature than that of the working fluid at the first outlet;
• and
• a second outlet for draining, to the outside of the sealed container, the working fluid supplied from the second inlet,
• wherein the second inlet and the second outlet are connected to the electric power generator of the sealed container, and
• the working fluid at the first inlet has a higher pressure than that of the working fluid at the second outlet during operation of the expansion machine.