Patent ID: 8353693

Claim:
A fluid machine comprising: a first eccentric rotation mechanism and a second eccentric rotation mechanism, each of the first and second eccentric rotation mechanisms including a cylinder having an annular cylinder chamber, an annular piston disposed eccentrically in the cylinder chamber to divide the cylinder chamber into an outer fluid chamber and an inner fluid chamber, and a blade arranged in the cylinder chamber to divide each of the inner and outer fluid chambers into a first chamber and a second chamber, the cylinder and the piston being arranged and configured to move in eccentric rotation relative to each other in order to compress or expand fluid in each of the inner and outer fluid chambers; a drive shaft including a main shaft portion, a first eccentric portion arranged to engage the first eccentric rotation mechanism and being eccentrically disposed relative to a rotation axis of the main shaft portion, and a second eccentric portion arranged to engage the second eccentric rotation mechanism and being eccentrically disposed relative to the rotation axis of the main shaft portion; an inflow passageway arranged and configured to introduce fluid from outside into the inner and outer fluid chambers of the first eccentric rotation mechanism; a communication passageway arranged and configured to introduce fluid discharged from the inner and outer fluid chambers of the first eccentric rotation mechanism into the inner and outer fluid chambers of the second eccentric rotation mechanism; and an outflow passageway arranged and configured to allow fluid discharged from the inner and outer fluid chambers of the second eccentric rotation mechanism to flow to outside.