Patent ID: 9068570
Filing Date: 2015-06-30
Classification: F04C

Abstract:
1. A motor-driven compressor comprising: a compression mechanism unit including a movable scroll and a fixed scroll operative to compress a refrigerant discharged from a suction pressure region, wherein the movable scroll and the fixed scroll defines a compression chamber having a volume that is decreased by an orbiting motion of the movable scroll; a rotation shaft; an electric motor that drives the movable scroll with the rotation shaft; a housing that accommodates the compression mechanism unit and the electric motor; an opposing member arranged in the housing and opposed to the movable scroll, wherein the opposing member is located at a side of the movable scroll opposite to the fixed scroll, the opposing member includes an opposing end face, which is opposed to the movable scroll, and the movable scroll includes a movable end face, which is opposed to the opposing member; a back pressure region located at a side of the movable scroll proximate to the opposing member, wherein the back pressure region is configured so that a pressure of the refrigerant in the back pressure region is operative to apply a force to the movable scroll, and the force is operative to push the movable scroll against the fixed scroll; and a projection, formed in a gap between the movable scroll and the opposing member, arranged in the movable end face, wherein the projection separates the back pressure region and the suction pressure region from each other; wherein the orbiting motion of the movable scroll moves the projection together with the movable scroll, the opposing member includes a communicating portion, and when the orbiting motion of the movable scroll moves the projection, the projection intermittently prevents the communicating portion from communicating between the back pressure region and the suction pressure region.