Hermetic Compressor

Abstract

There is provided a hermetic compressor which has a simplified structure and can satisfactorily separate a lubricating oil from a refrigerant and efficiently discharge the refrigerant from a hermetic container. A discharge passage ( 90 ) is provided to extend through a scroll unit ( 30 ) and a primary shaft frame ( 14 ), or between an inner wall surface of a body ( 3 ) of a hermetic container ( 2 ) and the scroll unit ( 30 ) and primary shaft frame ( 14 ) to guide the refrigerant with the lubricating oil directly to a stator ( 8 ) of an electric motor ( 6 ). Over the stator ( 96 ), an oil separation plate ( 96 ) is provided to separate the lubricating oil from the refrigerant conveyed through the discharge passage ( 96 ). A discharge pipe ( 72 ) is fitted to the body, below the primary shaft frame, to allow the refrigerant with the lubricating oil removed to be discharged from the hermetic container.

1 . A hermetic compressor, comprising:
 a hermetic container including a cylindrical body and defining a discharge chamber to an upper side of the body and a lubricating oil holding chamber to a lower side of the body, an interior of the body being at discharge pressure,   a rotary shaft extending inside the body and rotatably supported by a bearing   an electric motor disposed inside the body to drive the rotary shaft by being supplied with current, the electric motor including a rotor fixed on the rotary shaft to cause the rotary shaft to rotate integrally with it, a stator including coils and disposed to surround the rotor to cause the rotor to rotate, and a supply passage through the stator to guide a lubricating oil to the oil holding chamber,   a compression unit disposed inside the body, above the electric motor, to perform a process of sucking in, compressing and discharging a refrigerant by being driven by the rotary shaft,   a primary shaft frame disposed between the compression unit and the electric motor to allow the compression unit to be fixed thereon and receive the rotary shaft supported by the bearing,   a discharge passage extending at least either through the compression unit and the primary shaft frame, or between an inner wall surface of the body and the compression unit and primary shaft frame, to guide the refrigerant compressed by the compression unit and the lubricating oil contained therein from the discharge chamber directly to the stator,   an oil separation plate disposed over the stator to separate the lubricating oil from the refrigerant conveyed through the discharge passage, and   a discharge pipe fitted to the body, below the primary shaft frame, to allow the refrigerant having passed through the oil separation plate and the stator to be discharged from the hermetic container.   
     
     
         2 . The hermetic container according to  claim 1 , wherein the discharge passage is a pipe extending at least either through the compression unit and the primary shaft frame, or between the inner wall surface of the body and the compression unit and primary shaft frame, toward the stator. 
     
     
         3 . The hermetic container according to  claim 1 , wherein the discharge passage includes a hole extending through the compression unit and the primary shaft frame. 
     
     
         4 . The heiinetic container according to  claim 1 , further comprising wires laid on the inner wall surface of the body to operate the electric motor, the discharge pipe being in a position opposite to the wires with the rotary shaft between.