Refrigerant Compressor

Abstract

Disclosed is a compressor for hermetically sealed small refrigeration machines. Said compressor comprises a cylinder with a cylinder housing ( 4 ) and a piston that is guided in the piston bore of the cylinder and is used for compressing a working medium, the cylinder being closed in an axial direction by means of a cylinder head ( 1 ). According to the invention, a fastening element ( 2, 24, 25 ) is provided which fixes the cylinder head ( 1 ) to the cylinder housing ( 4 ) using contact pressure that is applied in the area of the axis of the piston bore. Said fastening element can be embodied as a clamp ( 2 ), a locking clip ( 24 ), or an elastically bendable fastening means ( 25 ) such as a rope ( 25 ). The clamp ( 2 ) can be provided with a base part ( 5 ) and lateral parts ( 6 ), for example, the base part ( 5 ) being disposed in front of the cylinder head ( 1 ) in an axial direction. Contact pressure is applied to the cylinder head ( 1 ) in an axial direction with the aid of the base part ( 5 ) while the lateral parts ( 6 ) are firmly anchored relative to the cylinder housing ( 4 ).

1 - 20 . (canceled) 
   
   
       21 . A compressor for hermetically encapsulated small-type refrigerating machines, comprising a cylinder with a cylinder housing ( 4 ) and a piston guided in a piston bore of the cylinder for compressing a working medium, with the cylinder being sealed in an axial direction by a cylinder head ( 1 ), and a fastening element ( 2 ,  24 ,  25 ) is provided which fastens the cylinder head ( 1 ) to the cylinder housing ( 4 ) by a contact pressure exerted in the region of the axis of the piston bore, and the fastening element ( 2 ,  24 ,  25 ) comprises a base part ( 5 ) and lateral parts ( 6 ), with the base part ( 5 ) being arranged in the axial direction in front of the cylinder head ( 1 ) and a contact pressure is exerted on the cylinder head ( 1 ) in the axial direction with the help of the base part ( 5 ), wherein the lateral parts ( 6 ) are formed as legs ( 6 ) which are laterally projecting from the base part ( 5 ), and which end sections ( 7 ) spaced from the base part ( 5 ) are latched on the cylinder housing ( 4 ) or on bearing blocks ( 3 ) which are rigidly connected with a supporting part ( 9 ) of the compressor. 
   
   
       22 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the fastening element ( 2 ,  24 ,  25 ) is a preferably ushaped clamp. 
   
   
       23 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the base part is provided with an arched configuration in the direction of the legs ( 6 ). 
   
   
       24 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the bearing blocks ( 3 ) each having at least one edge ( 12 ) which are encompassed at least partly by the end sections ( 7 ) of the legs ( 6 ). 
   
   
       25 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 22 , wherein for forming a latching the clamp ( 2 ) encompasses the entire cylinder housing ( 4 ), with the cylinder housing ( 4 ) having edges ( 13 ) which are encompassed at least partly by the end sections ( 7 ) of the legs ( 6 ). 
   
   
       26 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the latching is formed with the help of grooves ( 8 ) in the cylinder housing ( 4 ) into which engage one end section ( 7 ) each of the legs ( 6 ). 
   
   
       27 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the base part ( 5 ) guides a pressing screw ( 14 ) which exerts a contact pressure on the cylinder head ( 1 ) in the axial direction. 
   
   
       28 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the base part ( 5 ) rests directly on the cylinder head ( 1 ) and the lateral parts ( 6 ) are anchored to bearing blocks ( 3 ) fixedly joined to a supporting part ( 9 ) of the compressor, with at least one of the lateral parts ( 6 ) being configured as a screwed connection between base part ( 5 ) and bearing block ( 3 ). 
   
   
       29 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the fastening element ( 2 ,  24 ,  25 ) is a locking clip. 
   
   
       30 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 29 , wherein the fastening element ( 2 , 24 , 25 ) is a wire ( 25 ). 
   
   
       31 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , with the cylinder head ( 1 ) comprising a valve plate ( 16 ), characterized in that the valve plate ( 16 ) is partly sunk into a bore ( 17 ) in the cylinder housing ( 4 ), which bore comprises a step. 
   
   
       32 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 31 , wherein the valve plate ( 16 ) comprises a radial nose ( 18 ) which engages in a respective radial notch ( 19 ) in the cylinder housing ( 4 ). 
   
   
       33 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 30 , wherein valve plate ( 16 ) as well as the cylinder housing ( 4 ) each comprise a radial notch ( 35 ,  36 ) into which a locking body ( 34 ) can be inserted with radial alignment of the notch ( 35 ) of the valve plate ( 16 ) with the notch ( 36 ) of the cylinder housing ( 4 ). 
   
   
       34 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 33 , wherein the cylinder head ( 1 ) can also comprise a radial notch ( 37 ) into which the locking body ( 34 ) can be inserted with overlapping alignment of the notch ( 35 ) of the valve plate ( 16 ) with the notch ( 37 ) of the cylinder head ( 1 ). 
   
   
       35 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 30 , wherein in addition to the valve plate ( 16 ) the cylinder head ( 1 ) is at least partly sunk into the bore ( 17 ) in the cylinder housing ( 1 ), which bore preferably comprises a step. 
   
   
       36 . A compressor for hermetically encapsulated small-type refrigerating machines according to  claim 21 , wherein the contact pressure exerted by the fastening element ( 2 ,  24 ,  25 ) in the area of the axis of the piston bore corresponds to an axial force of pressure of 1000 N to 10000 N, preferably 3000 N.