Patent ID: 8915699

Claim:
A circulation structure in a housing of a turbo compressor, comprising: an annular chamber defined by the housing and extending within the housing that is traversable in a circumferential direction, is concentric to an axis of the turbo compressor in a region of a free blade end of a blade ring, and radially borders a main flow channel; a plurality of chambers defined by the housing and extending within the housing that are open to the main flow channel, are traversable in an axial direction, and are situated upstream of the annular chamber when viewed from a main flow direction of the main flow channel; and a radial recess defined by the housing and extending within the housing that is open to the main flow channel, that is configured only in a region of the plurality of chambers that are traversable in the axial direction, and that is located at a position of the plurality of chambers in the axial direction.