Compressor, in particular a radial piston compressor for carbon dioxide as a refrigerant

Abstract

A compressor, in particular a radial piston compressor, further in particular a compressor for CO 2 as a refrigerant, including a compressor unit for compressing refrigerant and a drive shaft for driving the compressor unit and a motor chamber bounded substantially by a motor housing, wherein the motor chamber has a fluid connection to a suction gas side, in particular a suction gas chamber, of the compressor by means of a fluid connection formed at least partially in the drive shaft, wherein at least one device for accumulating oil is arranged in the fluid connection.

1 . A compressor, in particular radial piston compressor, more particularly a compressor for CO 2  as refrigerant, which compressor comprises a compressor unit for compressing refrigerant and comprises a drive shaft for driving the compressor unit and also comprises a motor chamber delimited substantially by a motor housing, the motor chamber being fluidically connected to a suction gas side, in particular suction gas chamber, of the compressor via at least one fluid connection formed at least partially in the drive shaft,
 wherein at least one device for causing a build-up of oil is arranged in the fluid connection.   
     
     
         2 . The compressor as claimed in  claim 1 ,
 wherein the at least one device for causing a build-up of oil is formed so as to maintain an uninterrupted fluid connection.   
     
     
         3 . The compressor as claimed in  claim 1 ,
 wherein the fluid connection comprises an in particular cylindrical first axial cutout which is formed in the axial direction in the drive shaft.   
     
     
         4 . The compressor as claimed in  claim 1 ,
 wherein the fluid connection is fluidically connected to at least one in particular cylindrical radial cutout which is formed in the radial direction in the drive shaft.   
     
     
         5 . The compressor as claimed in  claim 3 ,
 wherein the fluid connection has a tubular element whose outer diameter is smaller than the diameter of the axial cutout, wherein the tubular element is arranged parallel to or concentrically with respect to the axial cutout and projects at least partially into the latter.   
     
     
         6 . The compressor as claimed in  claim 5 ,
 wherein the tubular element is fluidically connected to the suction gas side, in particular suction gas chamber.   
     
     
         7 . The compressor as claimed in  claim 3 ,
 wherein the fluidic connection comprises a second, in particular cylindrical axial cutout which is formed in the axial direction in the drive shaft and whose cross section, in particular diameter, is smaller than that of the first axial cutout, and in that the second axial cutout is fluidically connected at one end thereof to the first axial cutout and which opens out at its second end into the suction gas side.   
     
     
         8 . The compressor as claimed in  claim 7 ,
 wherein the second axial cutout is fluidically connected at one end thereof to the first axial cutout by means of at least one radial cutout, preferably radial bore, which extends radially relative to said first axial cutout.   
     
     
         9 . The compressor as claimed in  claim 1 ,
 wherein the fluid connection has a point of reduced cross section.   
     
     
         10 . The compressor as claimed in  claim 9 ,
 wherein the point of reduced cross section comprises a nozzle or an orifice or a point of reduced material cutout or a flap.   
     
     
         11 . The compressor as claimed in  claim 9 ,
 wherein the point of reduced cross section is arranged in the second axial cutout and/or in the radial cutout.   
     
     
         12 . The compressor as claimed in  claim 9 ,
 wherein the point of reduced cross section has an adjustable, in particular controllable or regulable cross section.   
     
     
         13 . The compressor as claimed in  claim 1 ,
 wherein the fluid connection comprises at least one further in particular reservoir-like or basin-like cutout which is arranged in the drive shaft and which is designed to cause a build-up of the oil.   
     
     
         14 . The compressor as claimed in  claim 1 ,
 wherein an oil overflow is provided which determines the amount of oil built up or accumulated.   
     
     
         15 . The compressor as claimed in  claim 14 ,
 wherein the oil overflow comprises a tubular element which is arranged in a radial cutout in the drive shaft and which projects into the fluid connection between the motor chamber and the suction gas side.