Patent ID: 7124585

Claim:
A scroll-type expander, comprising: a sealed housing having a heating surface to an outside area, and including at least one of each of an inflow opening and an exhaust opening at both a center area and a circumferential area; at least a stationary scroll member fixed within the housing and extending from the center area of the housing outwardly in a spiral shape; at least an orbiting scroll member meshed with the stationary scroll member within the housing and extending from the center area of the housing outwardly in a spiral shape, the orbiting scroll member being orbiting along a predetermined orbiting radius to continuously expand working fluid entering the housing; heating chamber provided to an outer circumference of the housing and which supply heat when working fluid is expanded by the motion of the orbiting scroll member; drive shafts connected to the orbiting scroll member to drive the orbiting scroll member; and a pre-heating pipe connected to the working fluid inflow opening of the center area of the housing and extending into the heating chambers to pass through the heating chambers so that the working fluid entering the heating chambers may absorb heat.