Fluid Machine

Abstract

A fluid machine includes a lubrication mechanism ( 70, 72 ) configured to utilize a rotary shaft ( 14 ) to supply lubricating oil stored in an inside bottom ( 2 a ) of a hermetic container ( 2 ) to an upper region in the hermetic container, a frame ( 36 ) secured to the hermetic container and disposed in contact with an upper surface ( 16 a ) of a cylinder block ( 16 ) to support a driven unit ( 6 ), the frame having an upper surface ( 38 a ) onto which the lubricating oil supplied to the upper region in the hermetic container flows down, a connecting rod ( 20 ) arranged under the frame and coupling the rotary shaft to a piston ( 18 ), a piston pin ( 66 ) coupling the connecting rod to the piston, a first oil feed hole ( 78 ) formed through the frame and the cylinder block, and a second oil feed hole ( 80 ) formed through the frame.

1 . A fluid machine comprising:
 a hermetic container storing lubricating oil in an inside bottom thereof;   a driving unit arranged inside the hermetic container;   a driven unit arranged inside the hermetic container and including a piston driven by the driving unit through a rotary shaft, and a cylinder block having a cylinder bore formed therein, the piston being reciprocated within the cylinder bore to draw in and discharge a working fluid;   a lubrication mechanism configured to utilize the rotary shaft to supply the lubricating oil stored in the inside bottom to an upper region in the hermetic container;   a frame secured to the hermetic container and disposed in contact with an upper surface of the cylinder block to support the driven unit, the frame having an upper surface onto which the lubricating oil supplied to the upper region in the hermetic container flows down;   a connecting rod arranged under the frame and coupling the rotary shaft to the piston;   a piston pin coupling the connecting rod to the piston;   a first oil feed hole formed through the frame and the cylinder block; and   a second oil feed hole formed through the frame.   
     
     
         2 . The fluid machine according to  claim 1 , wherein, when the piston is at a bottom dead center thereof, the first oil feed hole is located immediately above the piston pin and the second oil feed hole is located immediately above the connecting rod. 
     
     
         3 . The fluid machine according to  claim 2 , wherein, when the piston is at a top dead center thereof, the first and second oil feed holes are located immediately above the connecting rod. 
     
     
         4 . The fluid machine according to  claim 1 , wherein the frame has oil reservoir sections formed by spot-facing respective openings of the first and second oil feed holes. 
     
     
         5 . The fluid machine according to  claim 1 , wherein the connecting rod has an oil groove formed in an upper surface thereof and extending from a location near the rotary shaft to a vicinity of the piston pin. 
     
     
         6 . The fluid machine according to  claim 1 , wherein pressure of the working fluid drawn into and discharged from the driven unit prevails in an interior of the hermetic container, and the working fluid is a carbon dioxide refrigerant.