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.

1 . A compressor of an exhaust-gas turbocharger, comprising:
 a rotatably mounted compressor wheel;   a main flow duct for supplying a medium for compression to the compressor wheel; and   a circulation chamber, arranged radially outside the main flow duct and delimited from the main flow duct by a contoured wall, which extends from an intake region of the main flow duct to a circulation opening formed into the contoured wall in a region of rotor blades of the compressor wheel, with the contoured wall being fastened to a housing of the compressor by struts in the circulation chamber, wherein a spacing between struts in at least one pair of struts arranged adjacent to one another in the circulation chamber is different in a circumferential direction than a spacing between struts arranged adjacent to one another in other pairs of struts.   
   
   
       2 . The compressor as claimed in  claim 1 , wherein struts arranged adjacent to one another in all of the pairs of struts have a different spacing in the circumferential direction than struts arranged adjacent to one another in the other pairs of struts. 
   
   
       3 . The compressor as claimed in  claim 1 , comprising:
 two or more circulation openings, formed into the contoured wall which are spaced apart from one another in a direction of flow in the main flow duct.   
   
   
       4 . The compressor as claimed in  claim 1 , wherein the struts are blade profiles or guide webs for imparting a swirl to a flow in the circulation chamber. 
   
   
       5 . The compressor as claimed in  claim 1 , wherein the struts are all aligned radially, or are all inclined to a same extent relative to a radial direction of the compressor. 
   
   
       6 . The compressor as claimed in  claim 1 , comprising:
 an inlet guide wheel for generating a swirl in a flow, the inlet guide wheel being arranged upstream of the intake region of the main flow duct.   
   
   
       7 . The compressor as claimed in  claim 2 , comprising:
 two or more circulation openings, formed into the contoured wall which are spaced apart from one another in a direction of flow in the main flow duct.   
   
   
       8 . The compressor as claimed in  claim 7 , wherein the struts are blade profiles or guide webs imparting a swirl to a flow in the circulation chamber. 
   
   
       9 . The compressor as claimed in  claim 8 , wherein the struts are all aligned radially, or are all inclined to a same extent relative to a radial direction of the compressor. 
   
   
       10 . The compressor as claimed in  claim 9 , comprising:
 an inlet guide wheel for generating a swirl in a flow, the inlet guide wheel being arranged upstream of the intake region of the main flow duct.   
   
   
       11 . An exhaust-gas turbocharger having a compressor which comprises:
 a rotatably mounted compressor wheel;   a main flow duct for supplying a medium for compression to the compressor wheel; and   a circulation chamber, arranged radially outside the main flow duct and delimited from the main flow duct by a contoured wall, which extends from an intake region of the main flow duct to a circulation opening formed into the contoured wall in a region of rotor blades of the compressor wheel, with the contoured wall being fastened to a housing of the compressor by struts in the circulation chamber, wherein a spacing between struts in at least one pair of struts arranged adjacent to one another in the circulation chamber is different in a circumferential direction than a spacing between struts arranged adjacent to one another in other pairs of struts.