Patent ID: 6935833
Filing Date: 2005-08-30
Classification: F01D,F04D,F05D,Y10S

Abstract:
1. Recirculation structure for a turbocompressor which has a compressor axis, an annular main flow duct surrounding the compressor axis, and a blade ring in the main flow duct, said recirculation structure comprising: a ring chamber radially adjoining the main flow duct and opening to the main flow duct along an axial extent of the ring chamber and with axial ends of the ring chamber aligned with walls of the main flow duct, and a plurality of air guiding elements disposed in the ring chamber and configured to form a recirculation flow with air from the main flow duct entering the ring chamber at an axially downstream part of the ring chamber and exiting the ring chamber at an axially upstream part of the ring chamber with a defined swirl, said ring chamber being provided with an open axially extending recess at at least one axial end of said air guiding elements for accommodating air flow in a circumferential direction of the ring chamber, wherein an axial center of the ring chamber is disposed upstream of free radial ends of blades of the blade ring, and wherein said ring chamber is radially open to the main flow duct along substantially the entirety of the circumferential and axial extent of the ring chamber, and wherein free radial ends of the air guiding elements are substantially aligned with contours of the walls of the main flow duct which adjoin the ring chamber.