Scroll expansion machine

A scroll expansion machine comprising:

• a fixed scroll that comprises a mirror-surface plate and a spiral lap, the spiral lap being set-up on the mirror-surface plate;
• a revolving scroll that comprises a mirror-surface plate and a spiral lap, the spiral lap being set-up on the mirror-surface plate, the spiral lap of the revolving scroll and the spiral lap of the fixed scroll meshing with each other so that an expansion chamber is formed;
• a rotation prevention mechanism that prevents the rotation movement of the revolving scroll;
• a rotating shaft that rotates in response to the revolution movement of the revolving scroll;
• and,
• a generator that is connected to the rotating shaft and regenerates electric power,
• at least one inlet opening that is provided at a housing that is arranged between the revolving scroll and the generator;
• at least one outlet opening that is provided on the side of the fixed scroll;
• an air passage that guides air from the inlet opening to the outlet opening via a space around the rotating shaft, the space being outside of the outer periphery of the sealing surface formed between the revolving scroll and the fixed scroll;
• and
• a blower that introduces outside air into the air passage from the inlet opening,
• wherein the electric power is regenerated by an expansion energy of high-pressure steam that is introduced into the expansion chamber,
• wherein airflow is formed via the air passage from the inlet opening to the outlet opening, by use of the blower.