Drive device for pivoting adjustable blades of a turbomachine

Abstract

A drive device for pivoting adjustable blades of a turbomachine is provided. The drive device includes an annular flow channel section surrounded by a blade carrier, the section extending along the center line of the blade carrier and blades being provided in the section in a ray-like manner, forming a ring, wherein each of the blades can be pivoted about the longitudinal axis thereof and each has a pin which extends at least into the blade carrier and is coupled to at least one adjustment ring which encloses the blade carrier and may be driven by means of at least one motor. In order to provide a particularly low-wear and reliable drive, the drive shaft of the motor or motors is coupled to the adjustment ring or adjustment rings by means of a pinion gear.

1 - 10 . (canceled) 
     
     
         11 . A drive device for the pivoting of adjustable vanes of a turbomachine, comprising:
 an annular flow passage section which is encompassed by a vane carrier, extends along the center axis of the vane carrier and in which provision is made for a plurality of vanes in a radial manner, forming a ring, wherein for the adjustment, the plurality of vanes are pivotable in each case around their longitudinal axis and have in each case a pivot pin which extends at least into the vane carrier and is coupled to an adjustment ring which is rotatable in the circumferential direction and are driven via a motor,   wherein a drive shaft of the motor is coupled to the adjustment ring via a pinion gear,   wherein provision is made for a plurality of motors, the respective drive shaft of which comprises in each case one of the pivot pins or is rigidly connected to one of the pivot pins,   wherein the respective pinion gear is arranged in each case on the pivot pin of the vane which is thus directly driven, and   wherein the remaining vanes are driven via the adjustment ring.   
     
     
         12 . The drive device as claimed in  claim 11 , wherein two adjustment rings are coupled to the pivot pin and are driven by the motor or motors. 
     
     
         13 . The drive device as claimed in  claim 11 ,
 wherein provision is made in the vane carrier or in the casing which encompasses the vane carrier for a circumferential groove in which the pivot pins end and in which the adjustment ring are arranged, and   wherein for shielding on the outside the circumferential groove is closed off by means of a cover.   
     
     
         14 . The drive device as claimed in  claim 11 , wherein the coupling between adjustment ring and all the pivot pins is designed in each case as a pinion gear. 
     
     
         15 . The drive device as claimed in  claim 11 , wherein the pinion gears are designed as crown wheel drives. 
     
     
         16 . The drive device as claimed in  claim 13 , wherein each adjustment ring with regard to the center axis of the vane carrier is guided radially on the outside by the cover of the circumferential groove and radially on the inside by the groove base of the circumferential groove. 
     
     
         17 . The drive device as claimed in  claim 13 , wherein each adjustment ring is axially guided by a sidewall of the circumferential groove with regard to the center axis of the vane carrier. 
     
     
         18 . The drive device as claimed in  claim 17 , wherein means for pressing the adjustment ring onto the pivot pins are provided in the sidewall and/or between the sidewall and adjustment ring. 
     
     
         19 . The drive device as claimed in  claim 18 , wherein a plurality of passages for the feed of a hydraulic medium open into the sidewall. 
     
     
         20 . The drive device as claimed in  claim 18 , wherein provision is made between the sidewall and adjustment ring for a plurality of spring elements which are distributed uniformly over the circumference.