Sealed compressor

Abstract

A sealed compressor of the present invention comprises an electric component ( 105 ); a compression component ( 107 ); and a sealed container ( 101 ) accommodating the electric component ( 105 ) and the compression component ( 107 ); wherein the compression component ( 107 ) includes: a cylinder block ( 115 ) defining a compression chamber ( 135 ); a piston ( 125 ); and a valve plate ( 133 ) having a suction hole ( 137 ) through which a refrigerant gas to be compressed in the interior of the compression chamber ( 135 ) flows, and a discharge hole ( 139 ) through which the refrigerant gas compressed in the interior of the compression chamber 8135 ) is discharged; wherein the piston ( 125 ) is provided with a projection ( 155 ) on a tip end surface ( 153 ) which faces the valve plate ( 133 ); and wherein the projection ( 155 ) is configured such that side surfaces thereof include at least one flat surface and a gradient α of the flat surface with respect to the tip end surface of the piston ( 125 ) is smaller than a gradient β of another side surface of the projection ( 155 ) with respect to the tip end surface of the piston ( 125 ).

1 . A sealed compressor comprising:
 an electric component;   a compression component actuated by the electric component; and   a sealed container accommodating the electric component and the compression component;   wherein the compression component includes:   a cylinder block defining a compression chamber;   a piston which reciprocates in an interior of the compression chamber; and   a valve plate disposed to close an opening end of the compression chamber and having a suction hole through which a refrigerant gas to be compressed in the interior of the compression chamber flows into the interior of the compression chamber, and a discharge hole through which the refrigerant gas compressed in the interior of the compression chamber is discharged from the interior of the compression chamber;   wherein the piston is provided with a projection on a tip end surface which faces the valve plate; and   wherein the projection is configured such that side surfaces thereof include at least one flat surface and a gradient α of the flat surface with respect to the tip end surface of the piston is smaller than a gradient β of another side surface of the projection with respect to the tip end surface of the piston.   
     
     
         2 . The sealed compressor according to  claim 1 ,
 wherein the flat surface having the gradient α is placed to face the suction hole.   
     
     
         3 . The sealed compressor according to  claim 1 ,
 wherein the discharge hole has an opening area which increases from the compression chamber side toward an opposite side of the compression chamber.   
     
     
         4 . The sealed compressor according to  claim 1 ,
 wherein an opening portion of the discharge hole in the valve plate, which opening portion is at the compression chamber side, has a circular-arc cross-section.   
     
     
         5 . The sealed compressor according to  claim 1 ,
 wherein a cross-section of the projection which is taken along a plane which is substantially parallel to the tip end surface of the piston has a polygonal shape.   
     
     
         6 . The sealed compressor according to  claim 1 ,
 wherein a cross-section of the projection which is taken along a plane which is substantially parallel to the tip end surface of the piston has a rectangular shape.   
     
     
         7 . The sealed compressor according to  claim 1 ,
 wherein the gradient α is in a range of 65 degrees≦α≦80 degrees.