Improvements in or relating to stator blade ring assemblies for axial flow compressors and the like

摘要

757,230. Axial - flow compressors. DE HAVILLAND ENGINE CO., Ltd. Nov. 30, 1954 [Dec. 1, 1953], No. 33396/53. Class 110(1) A stator blade ring assembly for an axial-flow compressor or the like comprises a series of stator blades D1, Fig. 1, each extending in an approximately radial direction from the axis of an annular flow passage or in a direction which is tangential to a circle of relatively small diameter having its centre on the said axis (the direction, in either case, maybe having a component in the direction of the said axis) and each pivoted about its longitudinal axis or an axis parallel thereto, a cam member G1, Figs. 1 and 3 rigidly secured to the outer end of each blade and projecting in a direction having a substantial radial component relative to the pivotal axis, an operating ring, or sleeves H surrounding the blade-supporting ring B and carrying a series of followers H3 respectively engaging the cam members G1, and means for moving the sleeve H bodily in relation to the ring B so that the followers H3 act on the cam members G1 to rock the blades D1 simultaneously and similarly about their pivotal axes. The followers H3 are in the form of rollers mounted on ball bearings carried by supports H2 and each engaging a cam slot G2 in the respective member G1 so that longitudinal movement of the sleeve H causes pivotal movement of the blades D'. Sleeve H is supported on rollers J carried by radial trunnions J1 and engaging longitudinal slots in guide members K bolted to the ends of the sleeve H. The longitudinal movement of the sleeve H may be effected automatically in accordanc with, say, the speed of an engine with which the compressor is associated, or the air inlet temperature. Each blade D1 is pivoted at its inner end on a pin D2 mounted in a spherical bearing E carried by a shroud ring E2. At the outer end, a hollow pin D is journalled in a double-row taper roller bearing and carries the cam member G1 by means of splines and a securing bolt F. In the compresor shown, three rings of adjustable stator blading, which may be follewed by further rings of non-adjustable stator blading, are operated by a common sleeve H, the cam members G1 of the inlet ring extending in the opposite direction to those of the two other rings. The curvature of the cam slots G2 may be chosen to impart the same or different pivotal movements to the various rings of blading.