Sealed type comprssor

Abstract

A sealed type compressor includes a sealed vessel, compression and drive elements disposed in the sealed vessel, an oil pump and an oil supply groove. Upper and lower bearings sandwich the cylinder and piston of the compression element from respective axial sides. The drive element drives the compression element via a crank shaft. The lower bearing has an axially extending bearing portion to support the crankshaft. The oil pump draws up a lubricant into an oil channel extending in a shaft center direction of the crankshaft to provide lubrication to the compression and drive elements. The oil supply groove is provided at a sliding face of the bearing portion, and extends along the crankshaft to supply the lubricant to an outer surface of the crankshaft. The oil supply groove has a first open end side and a second closed end side at a lower end side of the crankshaft.

1 . A sealed type compressor having a compression element ( 7 ) and a drive element ( 8 ) accommodated in a sealed vessel ( 1 ), the sealed type compressor including a crankshaft ( 26 ), a piston ( 19   a,    19   b ) disposed at an outer circumference of an eccentric portion ( 20   a,    20   b ) of said crankshaft ( 26 ), a cylinder ( 12   a,    12   b ) defining a cylinder chamber ( 11   a ,  11   b ) where said piston ( 19   a,    19   b ) is disposed, and an upper bearing ( 13 ) and a lower bearing ( 14 ) having a bearing portion ( 13   a,    13   b ) to support said crankshaft axially, and sandwiching said cylinder ( 12   a,    12   b ) and said piston ( 19   a,    19   b ) from respective axial sides of said crankshaft ( 26 ), said sealed type compressor comprising:
 an oil pump ( 27 ) provided at a lower end of said crankshaft ( 26 ) to draw up a lubricant (O) stored in an oil reservoir ( 9 ) at a lower end portion of said sealed vessel ( 1 ) into an oil channel ( 26   a ) provided extending in a shaft center direction of said crankshaft ( 26 ) to provide lubrication at each sliding site of the compression element ( 7 ) and drive element ( 8 ), according to rotation of said crankshaft ( 26 ), and   an oil supply groove ( 14   b ) provided at a sliding face of said bearing portion ( 14   a ) of said lower bearing ( 14 ), extending along an axial direction of said crankshaft ( 26 ) to supply the lubricant to an outer surface of said crankshaft ( 26 ),   said oil supply groove ( 14 b) having one end side open at an end plane of said cylinder ( 12   b ) side and an other end side of said oil supply groove ( 14   b ) closed at a lower end side of said crankshaft ( 26 ).   
     
     
         2 . The sealed type compressor according to  claim 1 , wherein the other end side of said oil supply groove ( 14   b ) extends to a region partway of said bearing portion ( 14   a ). 
     
     
         3 . The sealed type compressor according to  claim 1 , wherein a value of X/L is set in a range from 0.2 to 1.0, where X is a length of said oil supply groove ( 14   b ) and L is an overall bearing length L of said bearing portion ( 14   a ).