Preswirl guide device

Abstract

The preswirl guide device for generating a preswirl in the intake region of a compressor comprises a multiplicity of guide vanes, which are pivotable about a respective vane shank connected to the guide vane, and a pivotable adjusting ring and adjusting levers for transmitting torque from the adjusting ring to the vane shank of each guide vane. The vane shank and the adjusting lever of the respective guide vanes are of one-piece design. The casing in which the guide vanes are rotatably mounted consists of at least two parts joined together in the region of the bearings of the guide vanes. Due to the one-piece design of the guide vane, the number of components to be fitted is reduced. This simplifies the fitting and possible service work on the guide device.

1 . A preswirl guide device for generating a preswirl in the intake region of a compressor, having guide vanes which are pivotable about a respective vane shank connected to the guide vane, having a pivotable adjusting ring, and having adjusting levers for transmitting torque from the adjusting ring to the vane shank of each guide vane, wherein the vane shank and the adjusting lever of the respective guide vanes are of one-piece design. 
   
   
       2 . The preswirl guide device as claimed in  claim 1 , wherein the adjusting lever of each guide vane comprises a cylindrical pin which is guided in such a way as to be rotatable about its axis and displaceable along its axis in a hole of a cylindrical transmission element, the transmission element being guided in such a way as to be rotatable about its axis and displaceable along its axis in a hole of the adjusting ring. 
   
   
       3 . The preswirl guide device as claimed in  claim 1 , wherein the adjusting lever of each guide vane comprises a hole in which a pin projecting radially from a cylindrical transmission element is guided, the transmission element being guided in such a way as to be rotatable about its axis and displaceable along its axis in a hole of the adjusting ring. 
   
   
       4 . The preswirl guide device as claimed in  claim 1 , wherein the adjusting lever of each guide vane has an end which is designed like a ball head and which is guided in a groove of the adjusting ring, the groove having walls which run parallel to one another and between which the ball head of the adjusting lever is guided. 
   
   
       5 . The preswirl guide device as claimed in  claim 4 , wherein the ball head is rotatably guided in a ball socket of a transmission element, and in that the transmission element is displaceable along the walls running parallel to one another. 
   
   
       6 . The preswirl guide device as claimed in  claim 1 , wherein a casing in which the guide vanes are rotatably mounted is comprised of at least two parts joined together in the region of the bearings of the guide vanes. 
   
   
       7 . The preswirl guide device as claimed in  claim 1 , wherein projections extending radially with respect to the axis of rotation of the guide vanes are arranged on the vane shank and on the casing surrounding the vane shank, a projection of the vane shank and a projection of the casing engaging one inside the other for the axial mounting of the respective guide vane. 
   
   
       8 . The preswirl guide device as claimed in  claim 1 , wherein with respect to the axis of rotation of the guide vane, a radially oriented groove is incorporated in the vane shank and/or in the casing surrounding the vane shank, which groove, for the axial mounting of the guide vane, interacts with a projection, extending radially with respect to the axis of rotation of the guide vane and engaging in the groove, and/or with a bearing ring. 
   
   
       9 . The preswirl guide device as claimed in  claim 1 , wherein a central body is arranged in the region of the tips of the guide vanes arranged radially about an axis. 
   
   
       10 . The preswirl guide device as claimed in  claim 9 , wherein shanks formed on the vane tips are rotatably mounted in radially oriented holes of the central body. 
   
   
       11 . The preswirl guide device as claimed in  claim 9 , wherein the central body is fastened to an external casing part via at least one retaining rib directed radially outward. 
   
   
       12 . The preswirl guide device as claimed in  claim 10 , wherein shanks formed on the vane tips are rotatably mounted in radially oriented holes of the central body. 
   
   
       13 . A compressor comprising a preswirl guide device as claimed in  claim 1 . 
   
   
       14 . An exhaust gas turbocharger comprising a compressor having a preswirl guide device as claimed in  claim 1 . 
   
   
       15 . The preswirl guide device as claimed in  claim 5 , wherein a casing in which the guide vanes are rotatably mounted is comprised of at least two parts joined together in the region of the bearings of the guide vanes. 
   
   
       16 . The preswirl guide device as claimed in  claim 5 , wherein projections extending radially with respect to the axis of rotation of the guide vanes are arranged on the vane shank and on the casing surrounding the vane shank, a projection of the vane shank and a projection of the casing engaging one inside the other for the axial mounting of the respective guide vane. 
   
   
       17 . The preswirl guide device as claimed in  claim 5 , wherein with respect to the axis of rotation of the guide vane, a radially oriented groove is incorporated in the vane shank and/or in the casing surrounding the vane shank, which groove, for the axial mounting of the guide vane, interacts with a projection, extending radially with respect to the axis of rotation of the guide vane and engaging in the groove, and/or with a bearing ring. 
   
   
       18 . The preswirl guide device as claimed in  claim 5 , wherein a central body is arranged in the region of the tips of the guide vanes arranged radially about an axis. 
   
   
       19 . A compressor comprising a preswirl guide device as claimed in  claim 5 . 
   
   
       20 . An exhaust gas turbocharger comprising a compressor having a preswirl guide device as claimed in  claim 5 . 
   
   
       21 . A preswirl guide device for generating a preswirl in the intake region of a compressor, comprising:
 a guide vane having a shank;   a pivotable adjusting ring; and   an adjusting lever for transmitting torque from the adjusting ring to the shank of the guide vane, wherein the shank and the adjusting lever are formed of one-piece.