Compressor stabilizer

Abstract

An annular circulation chamber is arranged in an interior of a compressor housing, which circulation chamber radially surrounds a main flow duct and extends from an intake region to an encircling circulation opening in a region of rotor blades of the compressor wheel. Between the circulation openings, the circulation chamber is delimited from the main flow duct by an annular contoured wall. The contoured wall is connected to the inner compressor housing by plural struts which are spaced apart from one another to different extents in the circumferential direction. As a result of the irregular distribution of the struts in the circumferential direction, generation of undesired vibration excitations can be reduced and / or eliminated.

Description

RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. §119 to European Patent Application No. 08170848.9 filed in Europe on Dec. 5, 2008, the entire content of which is hereby incorporated by reference in its entirety.FIELD[0002]The disclosure relates to the field of exhaust-gas-driven turbochargers, which, for example, include a compressor having a circulation chamber which is delimited from a main flow.BACKGROUND INFORMATION[0003]To increase the power of an internal combustion engine, it is known to use exhaust-gas turbochargers having a turbine in the exhaust section of the internal combustion engine and having a compressor which is positioned upstream of the internal combustion engine. Here, the exhaust gases of the internal combustion engine are expanded in the turbine. The work which is gained here is transmitted by a shaft to the compressor which compresses the air supplied to the internal combustion engine. By using the energy of the exhaust gases to comp...

AI Technical Summary

Benefits of technology

[0016]The non-uniform distribution of the support ribs can have an effect on distribution of the circumferential stiffness. In general, the compressor housing which receives the flow of the radial compressor stage downstream of the diffuser and supplies the flow to the pipeline system can be configured as a spiral, and therefore need not be circumferentially symmetrical. This can lead to a non-uniform deformation in operation as a result of thermal loading of the housing. As a result, a non-uniform distribution of degrees of play between a rotating compressor and a stationary housing can be formed. To prevent the rotor blades of the compressor wheel from grinding against the housing parts, the mean play can be increased, which can lead directly to efficiency losses. With non-uniform distribution of the support ribs, the inner housing which is close to the flow duct is also provided with a non-uniform stiffness over the circumference. A combination of the inner and outer housings can enable a reduction in play and provide an increase in efficiency.

[0017]Optionally, all of the pairs of struts arranged adjacent to one another can have a different spacing than the other pairs of struts arranged adjacent to one another.

[0018]A circulation chamber which is configured according to the exemplary embodiments disclosed herein can be used in a compressor with a swirl-generating inlet guide wheel. Here, the inlet guide wheel is arranged upstream of the intake region of the main flow duct with respect to the flow direction and, upstream of the compressor inlet, positively imparts a positive or negative flow component in the circumferential direction to the air which is supplied to the compressor.

Problems solved by technology

Recirculation therefore no longer takes place, which results in the desired displacement of the surge limit toward higher throughputs.

The desired expansion of the characteristic map of the compressor often comes at the expense not only of efficiency losses but also of the generation of inadmissible noise and vibrations.

The attachment and arrangement of the ribs is however relatively complex and only partially successful, since the sound is nevertheless transmitted to the compressor housing and radiated into the environment.

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