Radial compressor impeller and associated radial compressor

Abstract

A radial compressor impeller having a wheel disc, a cover disc arranged at a distance from the wheel disc, and blades arranged therebetween and connecting the wheel disc and the cover disc. The blades have an end portion, which is arranged at a distance from the radial outer end of the wheel disc and the cover disc towards the inside and has a reduced thickness with respect to an adjoining section.

1 .- 11 . (canceled) 
     
     
         12 . A radial compressor impeller comprising:
 a wheel disk,   a cover disk spaced apart from said wheel disk, and blades arranged therebetween and connecting the wheel disk and the cover disk and which have an end portion, spaced apart inward from the radial outer end of the wheel disk and the cover disk,   wherein the end portion has a reduced thickness compared with an adjoining portion,   wherein the end portions of the blades each have a rounded edge either on the suction side or on the pressure side.   
     
     
         13 . The radial compressor impeller as claimed in  claim 12 ,
 wherein the diameter of the blades is 1% to 15% less than the diameter d of the wheel and/or cover disk.   
     
     
         14 . The radial compressor impeller as claimed in  claim 13 ,
 wherein the rounded edge and the profile of the blade on the suction side merge gradually into each other.   
     
     
         15 . The radial compressor impeller as claimed in  claim 14 ,
 wherein the rounded edge has a radius R which corresponds at least approximately to the equation R≈a.d, where d is the diameter of the cover disk and/or the wheel disk, and a is a factor between 0.1 and 0.3.   
     
     
         16 . The radial compressor impeller as claimed in  claim 12 ,
 wherein approximately one third of the width of the radial outer end of the blades is designed to be approximately parallel to the outer circumference of the wheel disk and/or the cover disk, and the rounded edge of the suction side adjoins said one third of the width.   
     
     
         17 . The radial compressor impeller as claimed in  claim 16 ,
 wherein the rounded edge on the pressure side and the profile of the blade on the pressure side merge gradually into each other.   
     
     
         18 . The radial compressor impeller as claimed in  claim 12 ,
 wherein the rounded edge on the pressure side has a radius R which corresponds at least approximately to the equation R≈b.d, where d is the diameter of the cover disk and/or the wheel disk, and b is a factor between 0.1 and 0.3.   
     
     
         19 . The radial compressor impeller as claimed in  claim 18 ,
 wherein approximately one third of the width of the radial outer end of the blades is designed to be approximately parallel to the outer circumference of the wheel disk and the cover disk, and in that the rounded edge of the pressure side adjoins said third.   
     
     
         20 . A radial compressor comprising
 a radial compressor impeller as claimed in  claim 12 .   
     
     
         21 . The radial compressor impeller as claimed in  claim 15 , wherein a is a factor of 0.2. 
     
     
         22 . The radial compressor impeller as claimed in  claim 18 , wherein b is a factor of 0.2.