Closed rotary compressor

Abstract

A closed rotary compressor includes a generally cylindrical sealed vessel having an oil sump defined therein for accommodating a quantity of lubricating oil, a drive unit housed within the sealed vessel and having a drive motor and a shaft driven by the drive motor, and a compressor mechanism housed within the sealed vessel. The compressor mechanism is provided with at least one set of compression elements. This set of compression elements is made up of a cylinder having a compression compartment and a refrigerant intake port both defined therein in communication with each other, first and second bearings secured to the lower and upper end surfaces of the cylinder, respectively, for rotatably supporting the shaft, a crank provided on the shaft for rotation together therewith, a ring-shaped roller encircling the crank and capable of undergoing a planetary motion in contact with the crank during rotation of the crank, and a radial vane slidably accommodated in the cylinder for reciprocating movement in a direction radially of the cylinder. The radial vane has a radial inner end held in sliding contact with an outer peripheral surface of the ring-shaped roller, to thereby divide the compression compartment into a suction chamber and a compression chamber. An oil passage is provided in the compressor mechanism to place the oil sump in communication with the refrigerant intake port. The oil passage has a throttled portion at a location adjacent to the refrigerant intake port.