Abstract: A steam turbine installation includes a safety system located in the steam flow path having a stop valve located in the steam flow path upstream of the turbine and a vacuum break valve located in the stream flow path downstream of the turbine, and a combined regulating and safety device connected to the turbine produces signals for controlling these valves. In addition, a signal from a steam flow monitor located downstream of the stop valve is supplied to a logic system, this signal having a value which normally corresponds to the setting of the stop valve. In the event of a disparity the logic system functions to trip the regulating and safety device which results in a closure of the stop valve and a partial opening of the vacuum break valve.
Abstract: A packing container formed from a blank of thermo-plastic coated paper or cardboard erected into a rectangular body and provided with a top closure established by a bellows folding technique which terminates in a folded-down fin that is held in place against the adjacent container wall.
Abstract: A turbomachine plant comprises a gas turbine, a synchronous electrical machine operable as a motor or generator, and a compressor all mounted on the same shafting and adapted to be coupled together for two optional operating modes. In a first operating mode, the gas turbine serves to drive the synchronous electrical machine for generation of electrical power and the compressor is not utilized. In the second operating mode, the synchronous electrical machine operating as a motor serves to drive the compressor for gas compression and the gas turbine is not utilized. When in the first operating mode the compressor is not disconnected by conventional clutch means from the gas turbine-synchronous electrical machine group but rather always remains connected to that group and is arranged by suitable valving so as to rotate in a vacuum type of operation with a power loss which is slight in relation to the gas turbine.
Abstract: Fluid pressure operated disc brakes of a vehicle of the kind having a stationary member adapted to be secured to a non-rotatable part of a wheel assembly, a movable member on the stationary member, fluid pressure operated brake actuator incorporated into the movable member, a brake pad on one side of the friction disc slidably guided by the stationary member and directly responsive to the fluid pressure operated brake actuator, and a second friction pad on the opposite side of the fraction disc. A deformable resilient spacer is interposed between the stationary member and the movable member for resiliently mounting the movable member on the stationary member in restorably and axially shiftable relation to the stationary member due to the deformation of the resilient spacer.
Abstract: 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.
December 30, 1975
Date of Patent:
February 14, 1978
BBC Brown Boveri & Company Limited
Werner Haditsch, Hansruedi Rutz, Ernst Toplak
Abstract: An electrical power switch operating with a pressurized gas for actuating the switch contacts and also providing a quenching action in which the arc is lengthened and extinguished includes a container in which the pressurized gas is stored, the outlet from this container being located adjacent the junction area between a plurality of contact fingers in fixed position and a movable contact member that also includes a valve member for closing off the gas outlet from the container when the switch contacts are closed. When the movable contact is released for initiating an opening operation of the contacts, the pressure of the gas stored in the container forces the valve open thus releasing the gas for blasting the arc drawn between the contacts.
Abstract: An electrical arrester includes one or more pairs of electrodes disposed within quenching chambers which form current-limiting quenched spark gaps connected in series with an associated blow-out coil for magnetically influencing the arc in the quenching chambers. During the quenching operation, the blow-out coil is short-circuited and two different embodiments are disclosed for effecting this result. In one embodiment, the quenching chamber includes a short-circuiting electrode in the vicinity of that one of the electrodes of a pair which is conductively connected to one end of the blow-out coil and the other end of the latter is conductively connected to the short-circuiting electrode. In the other embodiment, the arrester includes a pair of auxiliary electrodes disposed within an auxiliary chamber and forming a by-pass spark gap connected in parallel with the blow-out coil.
Abstract: An electrical switch is provided with at least one set of stationary and movable main contacts for opening and closing the circuit controlled by it, and a set of stationary and movable auxiliary contacts for connecting a resistor in parallel with the main contacts and hence into the circuit controlled by the switch during a switching-in operation prior to engagement of the main contacts. The resistor is then disconnected either after the main contacts have engaged, or it is disconnected later during a switching-out operation prior to dis-engagement of the main contacts. Both operational modes are effected by means of a follower device which couples the movable auxiliary contact with the movable main contact.
Abstract: Apparatus for generating minimally delayed closing instructions for turbine valves of turbo-generator sets in the event of power system short circuits wherein major faults resulting in a drop in the system voltage are detected and act upon the valve means controlling the fluid flow to the turbine in such manner that a rapid closure of the valve means prevents the turbo-generator from falling out of step in the case of a sustained fault condition. A provisional valve-closing signal is produced upon a predetermined drop in the system voltage but this is cancelled in the event that the ensuing acceleration of the turbo-generator set does not increase to a predetermined level within two revolutions of the set.
Abstract: A differentially threaded bolting arrangement for bolting two machine parts together includes one or more bolts the opposite ends of which are provided with threaded sections differing in pitch, a threaded hole in one of the machine parts into which the bolt end with the greater pitch is threaded, a bore through which the bolt passes and an adjacent hollow area in the other machine part in alignment with the threaded hole, and a nut having a cylindric configuration located in the hollow area and which is movable axially but is restrained against rotation. The bolt end having the smaller pitch is threaded through the nut and as the bolt is rotated, the nut is thus caused to move axially into a forced contact with the lower end of the hollow area accompanied by a drawing together of the two machine parts.
Abstract: A control valve of the type wherein a valve member in the form of a piston moves axially within a piston guide cylinder located in a valve chamber. The valve chamber includes an inlet chamber, an outlet chamber, a valve seat area, and a main flow path and a plurality of by-pass ducts running through an inlet collar and terminating at the valve seat area. A by-pass admission duct which includes an entrance section located in a convexly curved portion of the inlet collar feeds the fluid controlled by the valve to the by-pass ducts and this duct which begins at a rotationally symmetrical throat section of the main flow path is generated by the respective boundary lines of the inlet collar and piston guide cylinder, the shortest connecting line between those boundary lines and an extension of the line which generates the valve seat area.
Abstract: 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. In order to reinforce the lead-through bolt and minimize the danger of breakage, a radially inwardly directed resilient force is applied to the outer end of the bolt. Provision is also made for internal as well as external cooling of the through-bolt by air which is taken in by respective air pick-up devices located on the surface of the shaft.
Abstract: Apparatus provided for measuring slippage of locomotive wheels and for preventing excessive sliding of the wheels and which produces a control signal for governing the locomotive speed uses as a basic criteria the variation in velocity between the translatory speed of the locomotive and the circumferential velocity of sliding wheels. Variation in velocity is measured by integrating acceleration differences between the effective acceleration of the locomotive and the wheel acceleration.
Abstract: In the preparation of plane or curved workpieces for welding together by means of an electron beam and wherein the weld takes the form of a full penetration joint, fusion lips are provided at the place where the lower welding bead forms. In the case where the workpieces are constituted by rotationally symmetrical thick-walled hollow bodies such as rotor discs for construction of turbo-machines which upon welding together form a closed cavity, the fusion lips have an annular configuration and are located at the inner radial contour of the welding interface. The workpieces are also provided with an arrangement for centering the lips and a metal foil is inserted between the lips to improve the toughness of the weld material, the foil having a carbon content lower than that of the parent metal of the workpieces.
Abstract: A packing laminate for use in the manufacture of disposable packages consists of a relatively thin central layer made from high-density polyethylene, two intermediate foam layers of polystyrene applied respectively to opposite faces of the central layer by means of a thermoplastic glue and two outer layers of a compact high-impact polystyrene applied respectively to the intermediate layers. The laminate is manufactured by joint extrusion of a flexible tube consisting of an inner layer of the foamed polystyrene and an outer layer of the compact high-impact polystyrene, this tube being thereafter split longitudinally into two halves to form two webs which are then joined respectively to opposite sides of the central layer of high density polyethylene following its extrusion.
Abstract: A support structure for the stator component of an electrical machine having a larger diameter, the rotor of which rotates about a vertical axis. The stator and foundation on which the stator rests form concentric inner and outer rings respectively joined by means of spoke-like arms spaced uniformly around the circumference, and the arrangement of these arms is such that they are tangent to the surface of an imagined coaxial cylinder the diameter of which is smaller than that of the inner ring, and the axes of two neighboring arms when imagined as extended in a straight line over both rings intersect only within the inner ring.
Abstract: A direction-changing arrangement for a three-phase pipe-type gas-pressurized electrical cable constituted principally by rigid straight pipe lengths connected in series and wherein the axes of the three phase conductors supported within the pipe when viewed in cross-section form a triangle. The desired change in direction is accomplished by interposing a spherical elbow pipe between two straight pipe lengths which includes a pair of branch pipe stubs connected to the ends of the adjoining straight pipe lengths, and three curved conductor members supported within the elbow and arranged symmetrically to the plane formed by the respective axes of the two branch pipe stubs which intersect at the center of the elbow. Three intermediate conductor sections are provided and these serve to interconnect the ends of the three inner conductors within the adjoining straight pipe lengths with the ends of the three curved conductor members within the elbow.
Abstract: A combined gas/steam power plant includes a gas turbine power set for delivering power such as for driving an electrical generator which comprises a combustion chamber, a gas turbine and a compressor driven by it, and a steam power plant comprising a steam generator and a steam turbine for delivering power such as for driving another electrical generator. Gas generators produce fuel gas for firing the combustion chamber and steam generator respectively. Independent charging groups, each comprising a gas turbine and compressor, are provided for the combustion chamber and steam generator respectively. Gasification air for generating the portion of fuel gas supplied to the combustion chamber is taken from the combustion air conveyed by the compressor of the gas turbine power set and compressed further in the compressor of the charging group allocated to the combustion chamber up to the pressure prevailing in the appertaining fuel gas generator.
Abstract: An alarm device of clocks having snoozing function in which, when a set time is reached in clock mechanism, switching means for alarm sound source is actuated to be ON-state through an actuating lever by a set-time indexing wheel shifted on a shaft being rotated by the clock mechanism. The actuating lever disposed for transmitting the shifted motion of the indexing wheel to the switching means is pivotable respectively in a first plane including axial shifting directions of the wheel and in a second plane perpendicular to the first plane. Pivotal motion of the lever in the first plane followingthe shifted motion of the wheel on the set time causes the switching means to be switched ON, in which state a snoozing means manually operated moves the lever pivotally in the second plane to cause the switching means temporarily to be switched OFF and restrict the lever in this position for a fixed cyclic period after the set time.
Abstract: An extension table for attachment to a sewing machine head of the portable type for enlarging the somewhat limited working area provided by flat upper surface of the bed in which the bobbin mechanism is housed under the needle and presser foot wherein the table is pivotally mounted on a support structure associated with the machine in such manner as to enable it to be shifted between a vertical position along one side of the machine for storage with the latter within a case, and a horizontal working position co-planar with the upper surface of the bed. The table has an elongated L-shaped configuration and is mounted on the supporting structure in such manner that when in its horizontal working position the short and long sides thereof respectively lie adjacent the end and side walls of the machine bed.