Bbc Brown, Boveri & Company, Limited

Brown, Boveri & Cie Ag

Ernst Toplak

Jurgen Baer

Fritz Hegewaldt

Werner Haditsch

Horst Gillhaus

Hans-Dieter Sommer

Hansruedi Rutz

Wolfgang Faber

Industrial oven providing air recirculation for heat treatment processes having temperature uniformity within a charge to be treated, including oven walls, spacers disposed between the oven walls for supporting the charge at a distance from the oven walls defining a space therebetween and for allowing a recirculated hot air flow around the charge from all sides, and elements disposed in the space between the charge and the oven walls for influencing the air flow.

Industrial oven with air recirculation for heat treating processes

An exciter-current lead-through bolt which is passed through a radial bore in the rotor shaft of a dynamo-electric machine, especially a turbo-generator, and screwed into an exciter-current lead-in conductor bar which lies in a longitudinally extending bore within the shaft. The radially outer part of the lead-through bolt is mechanically and electrically connected with a terminal conductor bar leading to the exciter winding located on the rotor. The lead-through bolt preferably made of steel because of its high mechanical strength is cooled internally by means of a forced air circulation system including a tube inserted in a longitudinal bore through the bolt, the diameter of the bore being greater than the external diameter of the tube in order to provide an annular space therebetween for flow of air from an air inlet port outside of the shaft radially inward to the end of the tube adjacent the inner end of the bolt, then into the tube and radially outward therethrough to an air discharge port also located outside of the rotor shaft and at a radial distance greater than the air inlet port.

Internally air cooled exciter-current lead-through bolt interconnecting

A method for starting a blower in the form of a single-stage radial fan installed in a pressure system such as the circulating cooling system of a turbogenerator in which the resistance of the pressure system is varying during the starting operation by means of a starting duct provided with a throttling element. The throttling element is closed at any desired blower speed ranging from 10 to 100% of its rated speed when the point of intersection between the pressure system characteristic, modified on the basis of the open throttling element, and the blower characteristic has been reached whereupon the desired point of operation conforming to the blower characteristic and the system characteristic will regulate itself automatically.

Method and apparatus for starting a blower

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Windisch, Switzerland

Ernst Toplak