Patent ID: 8323009

Claim:
A rotary-type fluid machine, comprising: a compression mechanism including two eccentric-rotation type piston mechanisms arranged one on top of the other; and a drive mechanism including a drive shaft that is configured and arranged to drive the two eccentric-rotation type piston mechanisms, each of the two eccentric-rotation type piston mechanisms including a cylinder member formed with a cylinder chamber, a piston member housed eccentrically in the cylinder chamber such that the cylinder chamber is partitioned into a first cylinder chamber and a second cylinder chamber, and a blade member partitioning each of the first cylinder chamber and the second cylinder chamber into a high-pressure side and a low-pressure side, with one of the cylinder member and the piston member being formed as a fixed member and the other being formed as a moving member configured to make eccentric rotational motion relative to the fixed member, and the moving member, the fixed member and the blade being configured and arranged such that as the moving member makes the eccentric rotational motion, a phase difference of 180 degrees in volume change is made between the first cylinder chamber and the second cylinder chamber, the moving members, the fixed members and the blades being further configured and arranged such that a phase difference of 90 degrees in volume change is made between the cylinder chambers of the two eccentric-rotation type piston mechanisms, and each of the two moving members having a first surface facing one of the first cylinder chambers and a second surface facing one of the second cylinder chambers, with a surface area of the first surface being equal to a surface area of the second surface.