Small Refrigerant Compressor

Abstract

The invention relates to a compressor for hermetically sealed small refrigeration machines, comprising a cylinder with a cylinder housing and a piston that is guided in the piston bore of the cylinder and that compresses a working medium. The cylinder is sealed by a disc-type valve plate in the axial direction, a cylinder cover lying against or being surrounded by the plate. According to the invention, the cylinder housing comprises axial extensions facing towards the cylinder cover and located in the peripheral area of the cover. A first axial section of the axial extensions lies against the cylinder cover in the contact region between the cylinder cover and the valve plate and a second axial section surrounds the cylinder cover with a small degree of play.

1 . A compressor for hermetically encapsulated small refrigerators, which has a cylinder having a cylinder housing (I) and a piston ( 2 ), which is guided in the piston bore of the cylinder, for compressing an operating medium, the cylinder being terminated in an axial direction using a disk-shaped valve plate ( 6 ), against which a cylinder cover ( 8 ) presses or which it encloses, wherein the cylinder housing ( 71 ) has axial projections ( 10 ) in the direction of the cylinder cover ( 8 ), which are situated around the circumference of the cylinder cover ( 8 ), the axial projections ( 10 ) pressing against the cylinder cover ( 8 ) in a first axial section ( 11 ) in the contact area of the cylinder cover ( 8 ) with the valve plate ( 6 ) and enclosing the cylinder cover ( 8 ) with slight play in a second axial section ( 12 ). 
   
   
       2 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein the second axial section ( 12 ) projects beyond the cylinder cover ( 8 ). 
   
   
       3 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein inwardly projecting retention nubs ( 13 ) are provided in the end section of the particular second axial sections ( 12 ). 
   
   
       4 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein a fastening element ( 9 ) is provided which attaches the cylinder cover ( 8 ) to the cylinder housing ( 1 ) by a contact pressure exerted in the area of the axis of the piston bore. 
   
   
       5 . The compressor for hermetically encapsulated small refrigerators according to  claim 4 , wherein the fastening element ( 9 ) is a spring element ( 9 ). 
   
   
       6 . The compressor for hermetically encapsulated small refrigerators according to  claim 3 , wherein the spring element ( 9 ) is a spring washer ( 9 ), whose sections facing away from the cylinder cover ( 8 ) are supported on the retention nubs ( 13 ). 
   
   
       7 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein an insulating material is located between the cylinder cover ( 8 ) and the particular second axial sections ( 12 ) of the projections ( 10 ). 
   
   
       8 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein the axial projections ( 10 ) enclose the cylinder cover ( 8 ) essentially completely. 
   
   
       9 . The compressor for hermetically encapsulated small refrigerators according to  claim 1 , wherein the axial projections ( 10 ) are implemented in one piece with the cylinder housing ( 1 ) and essentially represent extensions of the cylinder housing ( 1 ).