Refrigerant compressor system

Abstract

In order to improve a refrigerant compressor system, comprising at least one low-pressure stage and at least one high-pressure stage, a suction duct leading from a suction connection for the refrigerant to the low-pressure stage, an intermediate-pressure duct leading from the low-pressure stage to the high-pressure stage, a high-pressure connection connected to the high-pressure stage, and a lubricant bath to which the intermediate pressure in the intermediate-pressure duct is applied, in such a way that there is always an adequate supply of lubricant for the low-pressure stage, it is proposed that a lubricant feed device draws lubricant from the lubricant reservoir and feeds said lubricant to the induced refrigerant flowing to the low-pressure stage in an intake path.

1 . A refrigerant compressor system, comprising
 at least one low-pressure stage and at least one high-pressure stage, a suction duct leading from a suction connection for the refrigerant to the low-pressure stage, an intermediate-pressure duct leading from the low-pressure stage to the high-pressure stage, a high-pressure connection connected to the high-pressure stage, and a lubricant bath to which the intermediate pressure in the intermediate-pressure duct is applied, a lubricant feed device draws lubricant from the lubricant reservoir and feeds said lubricant to the induced refrigerant flowing to the low-pressure stage in an intake path.   
     
     
         2 . The refrigerant compressor system as claimed in  claim 1 , wherein the lubricant feed device feeds the lubricant to an intake path of the low-pressure stage which extends in the system housing. 
     
     
         3 . The refrigerant compressor system as claimed in  claim 1 , wherein the lubricant feed device comprises a dispensing unit, which dispenses a lubricant quantity in accordance with the operating state. 
     
     
         4 . The refrigerant compressor system as claimed in  claim 3 , wherein the dispensing unit is controlled by the compressor power. 
     
     
         5 . The refrigerant compressor system as claimed in  claim 3 , wherein the dispensing unit is controlled by a compressor shaft. 
     
     
         6 . The refrigerant compressor system as claimed in  claim 3 , wherein the dispensing unit is designed as a dispensing pump. 
     
     
         7 . The refrigerant compressor system as claimed in  claim 6 , wherein the dispensing pump has a speed-dependent delivery volume. 
     
     
         8 . The refrigerant compressor system as claimed in  claim 6 , wherein the dispensing pump is a gear pump. 
     
     
         9 . The refrigerant compressor system as claimed in  claim 1 , wherein a lubricant mass flow fed to the induced refrigerant makes up at most 5% of the total mass flow of refrigerant with lubricant drawn in by the low-pressure stage. 
     
     
         10 . The refrigerant compressor system as claimed in  claim 3 , wherein the refrigerant compressor system has a system housing on which the dispensing unit is arranged. 
     
     
         11 . The refrigerant compressor system as claimed in  claim 10 , wherein the dispensing unit is arranged on a cover of the system housing. 
     
     
         12 . The refrigerant compressor system as claimed in  claim 11 , wherein the dispensing unit is integrated into the cover. 
     
     
         13 . The refrigerant compressor system as claimed in  claim 11 , wherein a delivery duct leading from the dispensing unit to the lubricant reservoir is provided on the system housing. 
     
     
         14 . The refrigerant compressor system as claimed in  claim 11 , wherein a delivery duct for lubricant leading from the dispensing unit to the intake path is provided on the system housing. 
     
     
         15 . The refrigerant compressor system as claimed in  claim 1 , wherein a nozzle for the lubricant to be fed to the intake path is associated with said intake path. 
     
     
         16 . The refrigerant compressor system as claimed in  claim 1 , wherein the refrigerant compressor system comprises a piston compressor. 
     
     
         17 . The refrigerant compressor system as claimed in  claim 16 , wherein the piston compressor comprises a first cylinder bank to form the low-pressure stage and a second cylinder bank to form the high-pressure stage. 
     
     
         18 . The refrigerant compressor system as claimed in  claim 1 , wherein the lubricant reservoir is arranged in a drive space of the system housing. 
     
     
         19 . The refrigerant compressor system as claimed in  claim 18 , wherein the lubricant reservoir is arranged at the bottom of the drive space.