Radial compressor diffuser

Abstract

A radial compressor diffuser for a radial compressor stage includes a flow channel which extends radially outwards and which has a cylindrical inlet cross-section on a first radius which extends radially inwards and a cylindrical outlet cross-section which extends radially outwards. A radial diffuser outlet blade is provided in the region of the outlet cross-section in the flow channel. The outlet blade prevents known disadvantages of traditional bladed diffusers.

1 - 5 . (canceled) 
     
     
         6 . A radial compressor diffuser for a radial compressor stage, comprising:
 a flow passage, which extends radially outwards, and radially on the inside has a cylindrically encompassing inlet cross section on a first radius, and radially on the outside has a cylindrically encompassing exit cross section,   wherein the flow passage is configured to decelerate a gas flow, which discharges from a radial compressor impeller arranged directly upstream of the radial compressor diffuser and enters the flow passage through the inlet cross section, for discharging into a discharge volute casing through the exit cross section,   wherein in the region of the exit cross section provision is made in the flow passage for radial diffuser exit blading which has the effect that the discharge angle of the gas flow, which is pronounced by the radial diffuser exit blading, is virtually unaffected by the operating state of the radial compressor impeller, and that the radial extent of the blading towards the inside ends on a third radius, and   wherein the ratio of the third radius to the first radius is at least 1.2.   
     
     
         7 . The radial compressor diffuser as claimed in  claim 6 , wherein the radial diffuser exit blading has a plurality of guide blades arranged over the circumference, the leading edges of which are arranged in an encompassing manner on the third radius. 
     
     
         8 . The radial compressor diffuser as claimed in  claim 7 , wherein the plurality of guide blades arranged over the circumference have trailing edges which are arranged in an encompassing manner in a region between the third radius and the radius of the exit cross section. 
     
     
         9 . The radial compressor diffuser as claimed in  claim 8 , wherein the ratio of the third radius to the first radius is at least 1.35. 
     
     
         10 . A radial compressor stage having a radial compressor diffuser according to  claim 6 .