초록 ▼

Adjustable guide vanes (70) are circumferentially disposed about a rotor (40) at each stage of a multi-stage turbine (10) and are slidably connected to pairs of rotatable vane rings (61, 62) at each stage, the rings and guide vanes defining nozzles (82) leading from a scroll case (30) to the rotor a

Adjustable guide vanes (70) are circumferentially disposed about a rotor (40) at each stage of a multi-stage turbine (10) and are slidably connected to pairs of rotatable vane rings (61, 62) at each stage, the rings and guide vanes defining nozzles (82) leading from a scroll case (30) to the rotor at each stage, the nozzles having contoured surfaces (80) for minimizing hydraulic losses. Yoke mechanisms (104, 106) and interconnecting members (98, 100) link each pair of rotatable vane rings to a single actuator shaft (90) for synchronous adjustment of the positions of the guide vanes to vary the cross-sectional areas of the nozzles thereby permitting operation at optimum efficiency in response to changing flow rates.

대표청구항 ▼

A hydraulic rotary machine comprising: a case defining a stage in fluid communication between an inlet and a discharge; a shaft rotatably disposed in the case and extending through the stage; a bladed rotor secured to the shaft for rotation within the stage; a pluraity of guide vanes uniformly space

A hydraulic rotary machine comprising: a case defining a stage in fluid communication between an inlet and a discharge; a shaft rotatably disposed in the case and extending through the stage; a bladed rotor secured to the shaft for rotation within the stage; a pluraity of guide vanes uniformly spaced circumferentially about the rotor and generally tangentially oriented with respect to the periphery of the rotor; a pair of stationary vane rings axially positioned on opposite sides of the guide vanes and surrounding the rotor; pivot means for pivotally securing each guide vane to the stationary vane rings, each such pivot means having a pivot axis aligned parallel to the axis of the shaft; a pair of rotatable vane rings axially positioned on opposite sides of the guide vanes radially outward from the pivot means, the rotatable vane rings and the stationary vane rings having opposed surfaces which cooperate with opposing surfaces of adjacent guide vanes to define flow passageways, the opposed surfaces of the rotatable vane rings converging progressively toward one another and the opposing surfaces of the guide vanes converging progressively toward one another in a direction proceeding inwardly toward the bladed rotor such that the passageways maintain a streamlined shape and become progressively smaller in both radial and axial planes in such direction and in all positions of adjustment of the vanes; and slide means for slidably securing each guide vane to the rotatable vane rings so that a rotation of the rotatable vane rings relative to the stationary vane rings changes the minimum cross-sectional areas of the passageways between guide vanes.