Abstract: An improved cooling system utilizes flow resistant devices distributing liquid coolant to air foil coolant channels in a bucket of a turbine. A separate flow resistance device associated with each of the air foil coolant channels resist the flow of liquid coolant into the coolant channels whereby a fluid head is developed in a standpipe upstream of the flow resistance devices. The fluid head, together with the outward radial acceleration meters the flow of fluid through each flow resistance device according to the head. In the disclosed embodiments, the flow resistant devices alternately take the form of a tortuous passage, an orifice and a plurality of vortex flow chambers.

Abstract: A turbo-molecular pump has passive magnetic bearings which are radially stable but axially unstable and mechanical thrust bearings acting axially, the magnetic bearings and the stator forming a structural unit movable axially within the pump housing and connected to an element adjustably supporting one thrust bearing while the other thrust bearing is fixed to the housing with control gear being provided for adjusting the structural unit relative to the housing and the thrust bearing relative to the structural unit in dependence on force sensing devices.

Abstract: In a turbomachine having a cylindrical casing, a stage of adjustable vane assemblies including vanes rotatable on the casing and actuating arms rotatable with the vanes, a unison ring around the casing, and bearing means between each actuating arm and the unison ring operative to rotate each arm in unison with the unison ring while permitting relative radial thermal growth of the vanes and arms incident to temperature changes during machine operation, a support system for the unison ring including three radially inwardly directed attachment nodes on the unison ring and three Bowden cable assemblies on the casing between the attachment nodes, the Bowden cable assemblies having push-pull elements capable of force transmission only lengthwise pivotally connected to each attachment node with ends directed generally tangent to a circle defined by the cable assemblies so that net forces exerted by the push-pull elements to support the unison ring are directed tangent to the circle.