Radial compressor stage

Abstract

A radial compressor stage includes an impeller with multiple impeller blades on the rotor side and a diffuser with multiple guide blades on the stator side positioned downstream of the impeller. Between the impeller and the stator an impeller side gap is formed. Flow inlet edges of the guide blades on the stator side lie on a first circle contour such that the flow inlet edges of all guide blades on the stator side have an identical spacing to the flow inlet edges of the respective adjacent guide blades. Flow outlet edges of the guide blades on the stator side lie on a second circle contour such that in at least one first circumferential position the flow outlet edge of the respective guide blade on the stator side has a spacing to the flow outlet edge of at least one adjacent guide blade other than in second circumferential positions.

What is claimed is: 
     
         1 . A radial compressor stage comprising:
 a stator;   a rotor;   an impeller having a plurality of impeller blades on the rotor side rotating relative to a stator;   a diffuser having a plurality of guide blades on a stator side positioned in a flow direction downstream of the impeller; and   an impeller side gap formed between the impeller and the stator,   wherein flow inlet edges of the plurality of guide blades lie on a first circle contour such that the flow inlet edges of the plurality of guide blades have a substantially identical spacing to the flow inlet edges of a respective adjacent guide blades; and   wherein flow outlet edges of the plurality of guide blades lie on a second circle contour such that, in at least one first circumferential position, a respective flow outlet edge of a respective guide blade on the stator side has a spacing to the flow outlet edge of at least one adjacent guide blade other than in second circumferential positions.   
     
     
         2 . The radial compressor stage according to  claim 1 , wherein
 in the second circumferential positions the respective guide blades all have identical second stepping angles; and   in first circumferential position the respective guide blades on the stator side have a first stepping angle that deviates from the second stepping angle.   
     
     
         3 . The radial compressor stage according to  claim 2 , wherein the first stepping angle deviates from the second stepping angle by ±10°. 
     
     
         4 . A radial compressor stage, comprising:
 a stator;   an impeller having a plurality of impeller blades on a rotor side rotating relative to the stator;   a diffuser with a plurality of guide blades on a stator side positioned in flow direction downstream of the impeller;   an impeller side gap formed between the impeller and the stator,   wherein at least one guide blade has a curvature that deviates from the other guide blades on the stator side.   
     
     
         5 . A radial compressor stage, comprising:
 a stator;   an impeller with a plurality of impeller blades on a rotor side that rotates relative to the stator;   a diffuser with a plurality of guide blades on the stator side positioned in flow direction downstream of the impeller;   an impeller side gap formed between the impeller and the stator; and   a diffuser flow channel section formed between adjacent guide blades on the stator side in at least one first circumferential position has a flow cross section deviating from diffuser flow channel sections formed in second circumferential positions.   
     
     
         6 . The radial compressor stage according to  claim 5 , wherein relative to the second circumferential positions in the at least one first circumferential position between the adjacent guide blades on the stator side at least one side wall bounding the diffuser flow channel section subject to reducing the flow cross section is curved towards an inside into the diffuser flow channel section and/or subject to enlarging the flow cross section towards an outside into the stator. 
     
     
         7 . The radial compressor stage according to  claim 2 , wherein the first stepping angle deviates from the second stepping angle by ±7°. 
     
     
         8 . The radial compressor stage according to  claim 2 , wherein the first stepping angle deviates from the second stepping angle by ±5°.