Hermetic electrically driven compressor

Abstract

Contact noise occurring continuously in a hermetic electrically driven compressor is reduced. A stopper 106 has a protrusion 106 A projecting along the vertical direction at the inner circumferential side formed by draw forming. If vibration or impact is applied to a electrically driven compressor body 107 from outside during operation of the electrically driven compressor body 107 , the upper end portion of a crankshaft 105 prevents continuous rotary motion along the inner circumferential side of the stopper 106 . As a result, occurrence of noise can be reduced.

What is claimed is:  
     
         1 . A hermetic electrically driven compressor comprising a compressor element elastically supported in an enclosed container, a crankshaft provided with said compressor element, a motor element for driving said compressor element, and a cup-shaped stopper fixed to the inside upper part of said enclosed container and having a protrusion at its inner circumferential side, wherein the upper end portion of said crankshaft extends into said stopper.  
     
     
         2 . The hermetic electrically driven compressor of  claim 1 , wherein said protrusion is formed integrally with the stopper by draw forming.  
     
     
         3 . The hermetic electrically driven compressor of  claim 1  or  2 , wherein said protrusion is formed in a groove shape along the vertical direction of the stopper inside.  
     
     
         4 . The hermetic electrically driven compressor of  claim 1  or  2 , wherein the leading end portion of said protrusion is formed in a curvature.  
     
     
         5 . The hermetic electrically driven compressor of  claim 3 , wherein the leading end portion of said protrusion is formed in a curvature.  
     
     
         6 . The hermetic electrically driven compressor of  claim 1  or  2 , wherein said compressor element includes a compressor chamber and a piston moving reciprocally in the compressor chamber, and said protrusion is provided in a direction nearly vertical to the direction of reciprocal motion of the piston.  
     
     
         7 . The hermetic electrically driven compressor of  claim 3 , wherein said compressor element includes a compressor chamber and a piston moving reciprocally in the compressor chamber, and said protrusion is provided in a direction nearly vertical to the direction of reciprocal motion of the piston.  
     
     
         8 . The hermetic electrically driven compressor of  claim 4 , wherein said compressor element includes a compressor chamber and a piston moving reciprocally in the compressor chamber, and said protrusion is provided in a direction nearly vertical to the direction of reciprocal motion of the piston.  
     
     
         9 . The hermetic electrically driven compressor of  claim 5 , wherein said compressor element includes a compressor chamber and a piston moving reciprocally in the compressor chamber, and said protrusion is provided in a direction nearly vertical to the direction of reciprocal motion of the piston.