Control of axial thrust by guidance of the air drawn off from a centrifugal compressor

An inner combustion chamber casing of a turbomachine, the casing intended to be placed downstream of a centrifugal compressor, the casing comprising:

• a radially extending portion presenting a disc pierced by a central circle;
• and
• at least one guide vane of drawn-off air, the guide vane extending radially over the disc between a periphery of the disc and the central circle and spreading out axially from the disc so as to form with a downstream face of the centrifugal compressor a guide channel for the air which is drawn off upon exit from the compressor,
• wherein a first radially outer end of the guide vane extends radially beyond an outer circumference of the centrifugal compressor, and
• wherein the guide vane has a curved shape orienting in a radial direction at a second radially inner end.