Abstract: An operation control method for a multistage regulated hydraulic machine wherein channels of the stages from the lower pressure side to the higher pressure side are successively communicated with each other through return guides and at least two said stages are provided with respective guide vanes capable of having their degrees of opening controlled in synchronism with each other.

Abstract: A self-acting automatic clearance control apparatus for a turbine of the type which includes a turbine rotor mounted for rotation in a housing, the turbine rotor having cooperatively disposed on one side thereof a nozzle and on the other side an exhaust duct, the apparatus includes a control device positioned adjacent to the turbine rotor. The control device is coupled to the nozzle and the exhaust duct. The control device is responsive to changes in dimensions of said turbine rotor as the turbine operates over a range of temperatures to thereby change the relative position of the control device in respect of the turbine rotor whereby the clearance between the nozzle and the exhaust duct in respect to the turbine rotor is maintained automatically.

Abstract: A flow machine particularly a superheated gas turbine comprises a housing with a rotor disposed in the housing for rotation therein and sealed at each end with the housing by a labyrinth seal. The construction includes rotor shaft bearings which rotatably support the shafts and which are supported by bearing blocks disposed on the foundation. The housing and the shaft are mounted relative to each other by means of fluid pressure operated cushions adjacent each end of the shaft and adjacent the labyrinth seal so as to maintain the shafts and the seals with a predetermined clearance.

Abstract: A system for use in a gas-turbine engine, for controlling the clearance between the tips of the blades and a surrounding shroud, has a probe mounted in the shroud. A microwave oscillator supplies microwave energy to the probe which propagates energy towards the blades and receives energy reflected from the blades. A mixer is mounted remote from the probe and mixes the energy reflected from the blades with a reference signal derived either from energy transmitted by the oscillator or from the energy reflected by the tip of the probe. This produces interference dependent upon the phase difference between the energy reflected by the blades and the reference signal. From this phase difference, the system derives an indication of the separation of the blades from the probe and uses this to displace the shroud along its length, thereby altering the clearance between the tips of the blades and the shroud.

Abstract: An arrangement for the rigid connection of a drive or driven shaft with a coding disk of an angle coding device. Arranged at the drive shaft is a one-piece compensation ring comprising a first flange for receiving and attachment of a coding disk, a second flange for securing such compensation ring to the drive shaft, and a sleeve element interconnecting the two flanges. The first flange and the sleeve element are divided into segment portions or segments by slits distributed on the periphery, whereby there are absorbed most of the radially acting forces which are caused mainly by the different coefficients of expansion of the relevant materials. The arrangement is particularly suitable for a coding disk which is rigidly connected for rotation to the drive or driven shaft and which is operatively associated with an angle coding device for the reading of the elevation or azimuth alignment movement of an observation periscope.

Abstract: This device is aimed at solving the problem of varying sealing gaps between a rotatable turbine disc and fixed structure. Axial movement of the turbine disc relative to the fixed casing causes a ring coaxially carried in air bearings on the turbine disc for relative rotation and movement therewith, to operate at least one lever which in turn rotates a shaft. Rotation of the shaft operates further levers to cause seal rings operatively supported thereby, to precisely follow the axial movement of the turbine disc.

Abstract: A static shroud for a rotor comprises a shroud ring having a frustoconical inner surface adapted to co-operate with a peripheral portion of the rotor to define a small clearance therebetween. A plurality of actuators are provided to move the ring axially to vary the clearance in a predetermined manner. In order to compensate for eccentricity, the actuators are adapted to tilt the ring out of a radial plane when required.

Abstract: A thrust bearing wear detector is mounted on a positioning apparatus which is capable of moving the sensor a predetermined fixed distance toward and away from a rotating collar fixed to a turbine shaft. The positioning apparatus comprises a fixed piston, a movable piston, and a movable casing in which the pistons are slidable. Additionally, bias means, such as springs, position the pistons and the sensor in a predetermined, fixed position until working fluid is delivered under pressure through channels in the fixed piston. The positioning apparatus of the present invention readily facilitates verification of the proper operation of the wear detector.

Abstract: Cooling equipment is disclosed as having an axial flow fan whose blades are restrained from excessive bending in an axial direction.

Abstract: A system for shutting down a hydraulic machine having a runner mounted on a rotating shaft and a stationary part or parts surrounding the runner, comprising a rod or rods installed on the stationary part or parts opposite to the periphery of the runner, each rod being yieldable to the pressure of the runner, in case of the latter's deformation or off-center displacement, so as to sense the gap between the runner and the stationary part, a member or members each adapted to be actuated when the stroke of the associated sensing rod has exceeded a predetermined value, and a shutdown device operable upon actuation of the said member.

Abstract: A positioning device for varying a predetermined distance between a position sensor element and a rotor member disposed within a turbine apparatus. The positioning device comprises a concentric arrangement of rectilinearly displaceable members biased towards normal positions within a casing. Each member is displaced relative to the casing to either increase or decrease the predetermined distance between the sensor element and the rotor member.