Patent ID: 6769887
Filing Date: 2004-08-03
Classification: F04C

Abstract:
A scroll compressor provided in a closed vessel, comprising:a fixed scroll and an oscillating scroll respectively having plate-like scroll teeth in gear with each other so as to form a compression chamber therebetween; a compliant frame for supporting said oscillating scroll in an axial direction of said scroll compressor while supporting a main shaft in a radial direction of said scroll compressor for driving said oscillating scroll, said compliant frame being displaceable in said axial direction; and a guide frame for supporting said compliant frame in said radial direction, said oscillating scroll being made movable in said axial direction due to movement of said compliant frame in said axial direction relative to said guide frame; wherein said oscillating scroll has a thrust surface on a surface opposite to said plate-like scroll teeth; wherein a boss portion outside space formed inside a thrust bearing of said compliant frame slidable in pressure contact with said thrust surface is disposed midway in a differential pressure oil feed passageway for feeding lubricating oil by use of a running high/low pressure difference of said compressor; and wherein on the assumption that pressure Pm1 (MPa) of said boss portion outside space determined by a restrictor and a pressure regulator provided midway in said oil feed passageway is expressed by Pm1 =Ps&agr; and a differential pressure value at which a difference between high and low pressures becomes minimum in a running pressure range of said scroll compressor is represented by min(Pdâˆ’Ps), said value &agr; in said expression is set to fall in a range of: 0where Ps is suction pressure (MPa) of said compressor Pd is discharge pressure (MPa) of said compressor.