Cummins Turbo Technologies Limited

Holset Engineering Company, Limited

Bahram Nikpour

Roy Saxton

Andrew Paul Day

Paul A Eynon

John Bywater

Steven Howarth

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, in 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.

Multistage compressor with improved map width performance

A compressor comprises an impeller wheel mounted within a housing defining an inlet and an outlet. The wheel has a plurality of vanes and is rotatable about an axis. The housing has an inner wall defining a surface located in close proximity to radially outer edges of the impeller vanes which sweep across said surface as the impeller wheel rotates about its axis. The inlet comprises a tubular wall extending away from the impeller wheel in an upstream direction. An enclosed chamber is defined between said inner wall and an outer wall and in communication with at least one opening in said in said inner wall. The outer wall is penetrated by at least one ventilation aperture that is designed to be connected via a conduit to a location upstream of the inlet and downstream of an air filter.

Compressor

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.

A compressor comprises an impeller wheel mounted within a housing defining an inlet and an outlet. The wheel has a plurality of vanes and is rotatable about an axis. The housing has an inner wall defining a surface located in close proximity to radially outer edges of the impeller vanes which sweep across said surface as the impeller wheel rotates about its axis. The inlet comprises a tubular wall extending away from the impeller wheel in an upstream direction. An enclosed chamber is defined between said inner wall and an outer wall and in communication with at least one opening in said in said inner wall. The outer wall is penetrated by at least one ventilation aperture that is designed to be connected via a conduit to a location upstream of the inlet and downstream of an air filter. The arrangement maintains the advantages of a conventional MWE structure and further improves the surge margin. In addition, the risk of debris being drawn into the compressor via the opening is eliminated.

A compressor for compressing a gas comprises an impeller wheel mounted within a housing () defining an inlet and an outlet. The inlet comprises a map-width enhanced structure with an annular flow passage () defined between inner () and outer () tubular walls. The flow passage () is in fluid communication with the impeller wheel by virtue of a slot () in the inner wall (). A flow-conditioning member () is positioned in the annular flow passage () and serves to remove swirl from the gas flow that recirculates through the passage. The flow-conditioning member () comprises a body penetrated by a plurality of bores (). The arrangement provides for a significant improvement in the surge margin of the compressor and is particularly suitable for use in a turbocharger.

A compressor comprises an impeller () provided with a plurality of radial blades (). The impeller () has an inducer diameter defined by the outer diameter of front edges () of the blades (), and an outer diameter defined by the outer diameter of the blade tips (). Each blade () is backswept relative to the direction of rotation of the impeller () with an angle of backsweep in the range 45&#xb0; to 55&#xb0;. The ratio of the impeller inducer diameter to the impeller outer diameter is in the range 0.59 to 0.63. The ratio of the compressor diffuser outlet diameter to the impeller outer diameter is between 1.4 and 1.55.

A compressor for compressing a gas comprises an impeller wheel () mounted within a housing () defining an inlet and an outlet (). The inlet comprises an outer tubular wall () extending away from the impeller wheel in an upstream direction and forming a gas intake portion () of the inlet, and an inner tubular wall () of diameter D extending away from the impeller wheel in an upstream direction within the outer tubular wall () and defining an inducer portion () of the inlet. An annular gas flow passage () is defined between the inner and outer tubular walls () and has an upstream end and a downstream end separated by a length Lmeasured along its axis. The upstream end of the annular passage () communicates with the intake or inducer portions of the inlet through at least one upstream aperture and at least one downstream aperture () communicates between a downstream portion of the annular flow passage () and the impeller. The inner tubular wall () has a length Lextending upstream from the downstream aperture(s) (). The length of the inner tubular wall () is such that L/D&#x3e;0.65 and/or L/D&#x3e;0.6.

A compressor for compressing a gas comprises an impeller wheel () including a plurality of vanes () rotatably mounted within a housing (). The housing () has an inner wall defining a surface () located in close proximity to radially outer edges () of impeller vanes (). The compressor inlet comprises an outer tubular wall () extending forming a gas intake and an inner tubular wall () extending within the outer tubular wall () and defining an inducer portion () of the inlet. An annular gas flow passage () is defined between the inner and outer tubular walls. There is at least one downstream aperture () communicating between the annular flow passage () and the surface () of the housing () swept by the impeller vanes () and at least one upstream aperture communicating between the annular flow passage () and the inducer or intake portions of the inlet. A plurality of inlet guide vanes () are mounted within the inducer portion () of the inlet downstream of the at least one upstream aperture to induce pre-swirl in gas flowing through the inducer portion of the inlet.

A compressor comprises a housing ( ) defining an inlet ( ) and an outlet ( ), and a compressor wheel ( ) mounted for rotation about a shaft ( ) within a chamber defined by the housing between the inlet ( ) and the outlet ( ). The back of the compressor wheel ( ) is set into a recess ( ) defined by a wall of said housing ( ), the outside diameter of the recess ( ) being greater than the outside diameter of the recessed portion ( ) of the compressor wheel ( ) defining an annular clearance gap around the recessed portion of the compressor wheel ( ). The outside diameter of the recess ( ) is at least 1.05 times the outside diameter of the recessed portion of the compressor wheel and/or the depth of the recess in the region of said gap is greater than 1.5 times the axial width of the recessed portion of the compressor wheel.

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Huddersfield, United Kingdom

Bahram Nikpour