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A compressor typically for use in a turbocharger comprises a downstream radial compressor impeller wheel, an upstream axial compressor impeller wheel and an intermediate stator. The compressor housing has an inlet with inner and outer walls that define between them an MWE gas flow passage. An upstre

A compressor typically for use in a turbocharger comprises a downstream radial compressor impeller wheel, an upstream axial compressor impeller wheel and an intermediate stator. The compressor housing has an inlet with inner and outer walls that define between them an MWE gas flow passage. An upstream opening defined by the flow passage provides communication between the passage and the intake and at least one first slot downstream of the upstream opening provides communication between the passage and the inner surface of the inner wall. The stator comprises a plurality of fixed vanes and is disposed in the inner wall of the inlet between the radial and axial impeller wheels. The position of the slot can be at one of several positions along the gas flow passage, hi other embodiments there are second and third slots and the flow passage is divided into two parts. All the arrangements are designed to improve the compressor map width.

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1. A compressor comprising: a housing defining a gas inlet and a gas outlet;a radial impeller wheel having a plurality of vanes and mounted in the housing between said inlet and outlet, the wheel being rotatable about an axis;the inlet comprising a substantially tubular wall extending away from the

1. A compressor comprising: a housing defining a gas inlet and a gas outlet;a radial impeller wheel having a plurality of vanes and mounted in the housing between said inlet and outlet, the wheel being rotatable about an axis;the inlet comprising a substantially tubular wall extending away from the impeller wheel in an upstream direction and forming a gas intake, the inlet wall defining an inner surface at least a portion of which is located in close proximity to radially outer edges of the vanes of the radial impeller which sweep across said surface as the radial impeller wheel rotates about its axis;an axial impeller wheel having a plurality of vanes and supported for rotation in said inlet upstream of the radial impeller wheel;the axial and radial impeller wheels being mounted on a common shaft, the axial impeller wheel having an internal thread for connection to a corresponding thread on the shaft so as to retain the radial compressor impeller wheel in place;wherein an axial stator with fixed vanes is provided between the axial and radial impeller wheels, the threaded axial impeller also serving to retain the stator in place. 2. A compressor comprising: a housing defining a gas inlet and a gas outlet;a radial impeller wheel having a plurality of vanes and mounted in the housing between said inlet and outlet, the wheel being rotatable about an axis;the inlet comprising a substantially tubular wall extending away from the impeller wheel in an upstream direction and forming a gas intake, the inlet wall defining an inner surface at least a portion of which is located in close proximity to radially outer edges of the vanes of the radial impeller which sweep across said surface as the radial impeller wheel rotates about its axis;an axial impeller wheel having a plurality of vanes and supported for rotation in said inlet upstream of the radial impeller wheel;the axial and radial impeller wheels being mounted on a common shaft, the axial impeller wheel having an internal thread for connection to a corresponding thread on the shaft so as to retain the radial compressor impeller wheel in place;wherein the thread is defined on an internal surface of a hub of the axial impeller wheel, the vanes extending from the hub; andwherein an axial stator with fixed vanes is provided between the axial and radial impeller wheels, the threaded axial impeller also serving to retain the stator in place.