Adjusting clearance between flow straighteners and a compressor rotor.

摘要

Adjustment of the clearance between the variable pitch flow straighteners 1 and the rotor 8 of a compressor (eg. a turbojet high pressure compressor) is effected automatically and jointly with the adjustment of the pitch angle A of the flow straighteners 1. For this purpose each flow straightener 1 has at least one peg 15A slidably mounted in an oblique groove 16A of a bush 13A which is rigidly connected to the stator 2 and relative to which each flow straightener is rotatably mounted. A pivotal movement of each flow straightener 1 thus brings about a systematic modification of the clearance J1. In an alternative arrangement (figure 3) a adjustable stop (20) is also linked to the pitch change mechanism for the flow straightener, whereby it can be moved linearly to adjust clearance between the rotor blade tips (6A) and the stop (20).