Vane travel adjustment screw

摘要

An arrangement is provided for controlling a variable position of vanes at a turbine in a flow channel of a turbine. The arrangement includes a nozzle ring carrying a set of vanes, each of the vanes being connected to a vane pin housed in the nozzle ring. A rotational position of the vanes is accomplished via a vane displacement drive train including a pivotally supported pivot axle, a first actuator arm arranged on the pivot axle, which first arm is connectable to a drive actuator, a second actuator arm arranged on the pivot axle, which second arm is connected to a pin engaged with an unison ring for pivoting the unison ring, and a vane arm being connected to each vane pin and the unison ring for displacement of the vanes via pivotal displacement of the unison ring, and wherein a stop screw is arranged for limiting the pivotal displacement of the vanes.

主权项

1. Arrangement for controlling a variable position of a set of vanes in a flow channel of a turbine, the arrangement including a nozzle ring carrying the set of vanes, each of the vanes being connected to a vane pin housed in the nozzle ring, and a vane displacement drive train arranged to control a rotational position of the vanes in the flow channel, the vane displacement drive train including the following members:
a pivotally supported pivot axle, a first actuator arm arranged on the pivot axle, which first actuator arm is connectable to a drive actuator, a second actuator arm arranged on the pivot axle, which second actuator arm is connected to a pin engaged with an unison ring for pivoting the unison ring, and a vane arm being connected to each vane pin and the unison ring for displacement of the vanes via pivotal displacement of the unison ring, and wherein a stop screw is arranged for limiting the pivotal displacement of the vanes, the first actuator arm is located outside an enclosure forming a cavity in which the unison ring is located and is externally accessible for the drive actuator and the second actuator arm being positioned inside the enclosure, wherein the stop screw is arranged to limit the displacement of a member in the vane displacement drive train which is located closer to the vane pin in the vane displacement drive train than the pivot axle, and in that the stop screw extends through the enclosure to define an end stop for the member in the vane displacement drive train which the stop screw engages with.