Displacement compressor system for r-718

Abstract

A displacement compressor system for the refrigerant R718 includes a compressor machine, an evaporator, and a condenser. The open compressor machine is designed as a spindle compressor in the form of a double-shaft rotation displacement compressor for displacing and compressing gaseous conveying media. The displacement compressor has a spindle rotor pair which is arranged in a compressor housing and is designed with an electronic motor pair spindle rotor synchronization function. The compressor machine is arranged between the evaporator and the condenser.

1 . An R718 displacement compressor system comprising a compressor machine, an evaporator, and a condenser, wherein the compressor machine is configured as a spindle compressor formed as a twin-shaft rotary displacement machine configured for conveying and compressing gaseous media, includes a spindle-rotor pair in a compressor housing, with an electronic synchronization of the motor pair/spindle rotors, and is arranged between the evaporator and the condenser. 
     
     
         2 . The R718 displacement compression system according to  claim 1 , wherein the spindle compressor respectively includes one for each spindle rotor, in that two drive motors are arranged on a side of a gas inlet of the spindle compressor and project with their entire circumference into a space of an evaporator, configured for sufficiently discharging thermal power losses. 
     
     
         3 . The R718 displacement compressor system according to  claim 1 , wherein the system further includes a purge system via a shielding-gas supply feed and a shielding-gas discharge, configured to protect a plurality of sensitive structural components. 
     
     
         4 . The system according to  claim 1 , further comprises a centrifugal disk provided on each spindle rotor which introduces the injection cooling amount into the gas flow on the gas inlet side. 
     
     
         5 . The R718 displacement compressor system according to  claim 1  wherein the two spindle rotors have displacement profile flanks which are configured with a tooth profile offset Δk vs (z) between the right and the left profile flank side, wherein the tooth flank offset is preferably represented and generated via the Δ.be. 2 K(z) distribution in relation to the pitch distribution m(z) in the longitudinal rotor-axis direction z. 
     
     
         6 . The R718 displacement compressor system according to  claim 1  wherein it also includes control balls, which preferably take on the selected adaptation of the inner compression ratios in accordance with the specific application. 
     
     
         7 . The R718 displacement compressor system according to  claim 5  wherein the two-toothed spindle rotor is provided with an intermediate support, by which means preferably a weight reduction, in particular also for a lower mass moment of inertia during initial acceleration and deceleration, is achieved with a simultaneous high flexural rigidity, for example made from vacuum-compatible fibre composite material, e.g. as a CFRP material. 
     
     
         8 . The R718 displacement compressor system according to  claim 1  wherein at least one refrigerant-fluid feed is provided, in that each spindle rotor has a cylindrical evaporator cooling bore, which is connected to the refrigerant-fluid feed. 
     
     
         9 . The R718 displacement compressor system according to  claim 8  wherein each drive has a hollow shaft, in that the refrigerant-fluid feed to the cylindrical evaporator cooling bore of each drive occurs through the hollow shaft, and the bearings are configured for life. 
     
     
         10 . The R718 displacement compressor system according to  claim 1  wherein the system further includes an outlet-gap-iV adaptation, by means of which undercompression is curbed. 
     
     
         11 . A spindle compressor disposed in the R718 displacement compressor system according to  claim 1  wherein the spindle compressor has a control unit, which optimizes by means of the control of the operating parameters the efficiency of the R718 displacement compressor system in every working/operating point by means of the control unit.