Abstract: A compressor comprises a housing having an axial intake and an annular outlet volute. An impeller is mounted on a shaft for rotation about a shaft axis between the axial intake and the annular outlet volute. The impeller has a plurality of blades, each blade having a front edge facing the axial intake and a tip. The annular outlet volute includes an annular diffuser passage surrounding the impeller. The annular diffuser passage has a diffuser inlet downstream of the plurality of blades and a diffuser outlet communicating with the annular outlet volute, the tips of the blades sweeping across said diffuser inlet during use. A wall of the housing which defines the annular diffuser passage and which extends over the front edges of the blades defines an annular recess extending from the diffuser inlet towards the diffuser outlet.

Abstract: A compressor comprises a housing having an axial intake and an annular outlet volute. An impeller is mounted on a shaft for rotation about a shaft axis between the axial intake and the annular outlet volute. The impeller has a plurality of blades, each blade having a front edge facing the axial intake and a tip. The annular outlet volute includes an annular diffuser passage surrounding the impeller. The annular diffuser passage has a diffuser inlet downstream of the plurality of blades and a diffuser outlet communicating with the annular outlet volute, the tips of the blades sweeping across said diffuser inlet during use. A wall of the housing which defines the annular diffuser passage and which extends over the front edges of the blades defines an annular recess extending from the diffuser inlet towards the diffuser outlet.

Abstract: A compressor comprises a housing having an axial intake and an annular outlet volute. An impeller is mounted on a shaft for rotation about a shaft axis between the axial intake and the annular outlet volute. The impeller has a plurality of blades, each blade having a front edge facing the axial intake and a tip. The annular outlet volute includes an annular diffuser passage surrounding the impeller. The annular diffuser passage has a diffuser inlet downstream of the plurality of blades and a diffuser outlet communicating with the annular outlet volute, the tips of the blades sweeping across said diffuser inlet during use. A wall of the housing which defines the annular diffuser passage and which extends over the front edges of the blades defines an annular recess extending from the diffuser inlet towards the diffuser outlet.

Abstract: A method of manufacturing a compressor housing is provided including arranging a core with a die to define a mould cavity, solidifying a metal within the cavity to form a compressor housing having a diffuser first wall and an outlet volute first wall with an opening; the housing being formed such that a first angle is subtended between an outlet section of a surface of the diffuser first wall and a first section of a surface of the outlet volute first wall, wherein after the housing has been formed, the core is removed and a cut is applied, through the opening, to the first section of the surface of the outlet volute first wall to produce a cut section such that a second angle is subtended between the cut section and the outlet section of the surface of the diffuser first wall that is greater than the first angle.

Abstract: A method of manufacturing a compressor housing is provided comprising arranging a core with a die to define a mould cavity, solidifying a metal within the cavity to form a compressor housing comprising a diffuser first wall and an outlet volute first wall having an opening; the housing being formed such that a first angle is subtended between an outlet section of a surface of the diffuser first wall and a first section of a surface of the outlet volute first wall, wherein after the housing has been formed, the core is removed and a cut is applied, through the opening, to the first section of the surface of the outlet volute first wall to produce a cut section such that a second angle is subtended between the cut section and the outlet section of the surface of the diffuser first wall that is greater than the first angle.

Abstract: A compressor comprises a housing having an axial intake and an annular outlet volute. An impeller is mounted on a shaft for rotation about a shaft axis between the axial intake and the annular outlet volute. The impeller has a plurality of blades, each blade having a front edge facing the axial intake and a tip. The annular outlet volute includes an annular diffuser passage surrounding the impeller. The annular diffuser passage has a diffuser inlet downstream of the plurality of blades and a diffuser outlet communicating with the annular outlet volute, the tips of the blades sweeping across said diffuser inlet during use. A wall of the housing which defines the annular diffuser passage and which extends over the front edges of the blades defines an annular recess extending from the diffuser inlet towards the diffuser outlet.