Patent ID: 7559741
Filing Date: 2009-07-14
Classification: F01D,F04D,F05D

Abstract:
1. A turbomachine, comprising: an axially displaceable rotor; an annular duct between an outer guide surface fastened to an external wall and an inner guide surface arranged on the rotor; an annular flow duct narrowing in an axial direction and formed by a working medium flowing through the annular duct; a guide-blade ring formed from a guide blade having a guide profile extending between a platform of the guide blade arranged in the annular duct and an end of the guide blade exposed into the working medium; a moving-blade ring formed from a moving blade having a moving profile extending between a platform of the moving blade fastened to the rotor and an end of the moving blade exposed into the working medium; a first radial gap located in a first axial section formed between the outer guide surface and the exposed end of the moving blade; and a second radial gap located in a second axial section which is opposite to the first axial section formed between the inner guide surface and the exposed end of the guide blade, wherein the first and second radial gaps are parallel to a rotation axis of the rotor and a size of the radial gaps is constant over an axial displacement distance of the rotor, wherein a guide ring is configured by an axial section of the outer guide surface and is parallel to the rotation axis of the rotor, wherein the axial section of the outer guide surface is a sum of an axial length of the exposed end of the moving blade and the axial displacement distance of the rotor.