Turbomachine with radial-flow compressor impeller

Abstract

A compressor casing with a volute-shaped flow duct is fastened by means of a rigid fixing arrangement to the bearing casing of the turbomachine, with simple and low-cost means in such a way that the emergence of fragments of a burst compressor impeller from the compressor casing can be prevented. The compressor casing has an outer spiral casing, which surrounds a duct section of the flow duct deflected towards the outside into the radial direction (B), and an inner casing insert piece, which is provided in the radial direction (B) between the spiral casing and the compressor impeller and whose inner contour, together with the outer contour of the hub of the compressor impeller, forms the duct section of the flow duct extending essentially in the axial direction (A). The spiral casing is configured with an inner cylinder at least partially surrounding the casing insert piece, on which inner cylinder the casing insert piece is attached by means of a fixing arrangement, which is flexible in the axial direction (A), to form a hollow space. The flexible fixing arrangement of the casing insert is less secure against fracture than the rigid fixing arrangement of the compressor casing on the bearing casing.

Dependencies are inferred from the claim text.