Refrigerant compressor

Abstract

The invention relates to a refrigerant compressor, comprising: a preferably hermetically sealable compressor housing; an electric drive unit, comprising a rotor (4) and a stator (3); a crankshaft (1), which is connected to the rotor (4) for conjoint rotation and which has a longitudinal axis (2); a piston-cylinder unit, which can be driven by the crankshaft (1); wherein the electric drive unit is designed as an external rotor motor and the rotor (4) has a carrier element (12) extending outward radially with respect to the longitudinal axis (2) at least in some sections and the carrier element (12) is connected to the crankshaft (1) for conjoint rotation. According to the invention, in order to enable an increased delivery rate of lubricant from a lubricant sump together with preferably low or reduced height of the compressor, a sleeve-shaped lubricant receiver (8) for centrifugally conveying lubricant from a lubricant sump formed in a bottom region of the compressor housing toward the piston-cylinder unit is provided on a side of the carrier element (12) facing away from the piston-cylinder unit (5), the sleeve-shaped lubricant receiver (8) being joined to the carrier element (12) for conjoint rotation.

What is claimed is: 
     
         1 . A refrigerant compressor with
 a, compressor housing;   an electric drive unit comprising a rotor and a stator;   a crankshaft having a longitudinal axis that is nonrotatably connected to the rotor;   a piston-cylinder-unit that can be driven by the crankshaft;   where the electric drive unit is made as an external rotor motor and the rotor has a carrier element that extends at least partially radially outward with respect to the longitudinal axis, and the carrier element is connected nonrotatably to the crankshaft,   wherein a sleeve-shaped lubricant receptacle for centrifugal transport of lubricant from a lubricant sump formed in a bottom region of the compressor housing in the direction of the piston-cylinder-unit is provided on a side of the carrier element facing away from the piston-cylinder-unit, where the sleeve-shaped lubricant receptacle is nonrotatably connected to the carrier element.   
     
     
         2 . The refrigerant compressor as in  claim 1 , wherein the carrier element has a central through-opening running coaxially with respect to the longitudinal axis, where the sleeve-shaped lubricant receptacle is a separate component, and a fastening portion of the sleeve-shaped lubricant receptacle is attached to the carrier element in the region of the through-opening. 
     
     
         3 . The refrigerant compressor as in  claim 2 , wherein the through-opening is formed for the connection of the crankshaft by a sleeve-shaped prolongation of the carrier element. 
     
     
         4 . The refrigerant compressor as in  claim 3 , wherein the sleeve-shaped prolongation extends to the side of the carrier element facing away from the piston-cylinder-unit, a section of the crankshaft is nonrotatably connected to the through-opening, and the fastening portion of the sleeve-shaped lubricant receptacle is attached to an outer, with respect to the longitudinal axis, surface of the sleeve-shaped prolongation. 
     
     
         5 . The refrigerant compressor as in  claim 4 , wherein a ring-shaped supporting element that extends radially outward with respect to the longitudinal axis surrounds at least a section of the fastening portion of the sleeve-shaped lubricant receptacle. 
     
     
         6 . The refrigerant compressor as in  claim 5 , wherein the fastening portion of the sleeve-shaped lubricant receptacle is formed at least in part by the ring-shaped supporting element. 
     
     
         7 . The refrigerant compressor as in  claim 5 , wherein the ring-shaped supporting element is pressed or shrink-fit onto the fastening portion of the sleeve-shaped lubricant receptacle. 
     
     
         8 . The refrigerant compressor as in  claim 1 , wherein a fastening portion of the sleeve-shaped lubricant receptacle extends parallel to the longitudinal axis and
 that the sleeve-shaped lubricant receptacle has a collar section extending radially outward with respect to the longitudinal axis and connecting to the fastening portion.   
     
     
         9 . The refrigerant compressor as in  claim 3 , wherein the sleeve-shaped prolongation extends to the side of the carrier element that faces the piston-cylinder-unit,
 where the sleeve-shaped prolongation is connected nonrotatably to the crankshaft,   and the fastening portion of the sleeve-shaped lubricant receptacle is held nonrotatably in the through-opening formed by the sleeve-shaped prolongation.   
     
     
         10 . The refrigerant compressor as in  claim 1 , wherein the sleeve-shaped lubricant receptacle and the carrier element are made in one piece, where the lubricant receptacle is formed from the carrier element by a forming operation, and the end of the crankshaft facing away from the piston-cylinder-unit is held nonrotatably in the sleeve-shaped lubricant receptacle. 
     
     
         11 . The refrigerant compressor according to  claim 1 , wherein the housing is hermetically scalable. 
     
     
         12 . The refrigerant compressor as in  claim 3 , wherein the sleeve-shaped prolongation is formed from the carrier element by means of a forming operation. 
     
     
         13 . The refrigerant compressor as in  claim 8 , wherein the collar section of the sleeve-shaped lubricant receptacle bears against the carrier element.