Patent ID: 8562317

Claim:
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; a generator that is connected to the rotating shaft; 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 a 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 such that the air passes from the inlet opening to the outlet opening, wherein the revolving scroll and the fixed scroll come in contact with each other at the sealing surface and a dust seal is set between the revolving scroll and the fixed scroll at the sealing surface.