Patent ID: 7699589
Filing Date: 2010-04-20
Classification: F01C,F04C

Abstract:
1. A scroll-type fluid machine comprising: a housing including a drive casing and a compression casing air-tightly connected to said drive casing; a rotary shaft rotatably supported in said drive casing through a bearing; a scroll unit accommodated in said compression casing, said scroll unit having a movable scroll for carrying out a series of processes including suction, compression, and discharge of a refrigerant in cooperation with a fixed scroll by being driven by said rotary shaft to make a revolution of said movable scroll; a discharge chamber defined in said compression casing, for causing the refrigerant adjusted to prescribed discharge pressure by a discharge valve to feed from said scroll unit to a refrigerant circuit; a circulation path for introducing the refrigerant in said discharge chamber from the refrigerant circuit into said drive casing while maintaining the refrigerant pressure; and an inlet path formed in said compression casing, for leading the refrigerant in said circulation path to a rear side of said movable scroll to make a pressure of the led refrigerant counteract the refrigerant discharge pressure acting on a front side of said movable scroll.