Abstract: The device comprises a tubular casing (2) having a first coupling element (5) for feeding it with a first fluid at a first axial end, and a second coupling element (6) for exhausting a mixture of the first fluid and a second fluid at a second axial end. An internal fluid guide duct (18a, 18b) is placed coaxially inside the casing (2) of the mixer. The device further includes a third coupling element (7) in a lateral position passing through the casing (2) between the first coupling element (5) and the second coupling element (6) and opening out into a cylindrical chamber (3) of the mixer in a position facing the outer surface of the guide duct (18a, 18b). The guide duct (18a, 18b) may be made up of two portions and comprises a wall having an insulating space (19a, 19b) formed therein, which space is put into communication with the cylindrical chamber (3). The device of the invention can be used in particular for cooling supercritical water used in a process of oxidizing effluent in supercritical water.

Abstract: A method and corresponding apparatus for regulating a system that produces electric power, the system including an electric alternator having a rotor integral with a rotating part of a wind machine to form a rotary assembly, and a power electronics module, the method including the steps of: producing an alternating current at output terminals of the alternator; converting the alternating current produced by the alternator into modulated pulses of direct current. Alternating electric current produced by the alternator is regulated by controlling the speed of rotation of the rotary assembly by resisting torque imposed by the alternator in response to modulating the pulses of continuous current produced by the converted the alternating current.

Abstract: The cooling device according to the invention comprises, in each of the stator recesses which contain windings, a cooling tube located in the longitudinal direction of the recess and supplied with cooling fluid. The cooling tube is located in the inlet portion of each of the recesses which is closest to the air gap, and thus constitutes a thermal barrier between the windings of the stator and the permanent magnets carried by the rotor. A device for the external cooling of the stator may be combined with the tubes for cooling the internal portion of the stator.

Abstract: A thermal protection shield for a rotating shaft of a primary coolant pump shaft of a nuclear power station includes, in the thermal transition region between the hot fluid and the cold fluid, a ring of nickel alloy shrunk onto the shaft. An external ring of austenitic stainless steel is shrunk at each of its ends onto the ring of nickel alloy. Between the two shrunk-on ends, a cylindrical cavity forms a clearance with the external surface of the nickel alloy ring.

Abstract: The system comprises a nacelle mounted to turn about a vertical axis on the top of a mast and carrying a rotary portion which rotates about a substantially horizontal axis in a large diameter bearing. The rotary portion comprises a hub to which blades are fixed. The system has an electric generator comprising a stator and a rotor in the shape of a disk. The rotor is fixed by a connecting member to the hub adjacent the bearing so that the forces exerted by the wind on the rotary portion are transmitted directly to the bearing without passing through the electric generator.

Abstract: The cooling device according to the invention comprises, in each of the stator recesses which contain windings, a cooling tube located in the longitudinal direction of the recess and supplied with cooling fluid. The cooling tube is located in the inlet portion of each of the recesses which is closest to the air gap, and thus constitutes a thermal barrier between the windings of the stator and the permanent magnets carried by the rotor. A device for the external cooling of the stator may be combined with the tubes for cooling the internal portion of the stator.

Abstract: An electric motor is placed around the axle of a vehicle but includes a rotor that does not contact the axle. A drive element is fastened to the axle and extends radially from the axle. The drive element for driving the axle is coaxially fastened to the axle but located laterally with respect to the electric motor. The rotor includes a disk that directly engages elements in a peripheral region of a drive element disk, the engagement occurring at a point remote from the axis of the axle.

Abstract: The invention relates to a method of repairing the labyrinth seal of a diffuser in a primary pump, the diffuser being of the type comprising a peripheral skirt and a circular end wall having an orifice provided with the labyrinth seal. The method consists in making a bore in the circular end wall having a diameter greater than that of the orifice, in reducing the thickness of the remaining portion of the end wall, in forming a chamfer on the edge of the bore, in positioning a replacement part in said bore, the replacement part including a central orifice and a chamfer on its own peripheral edge, in making a bead of welding between the chamfers, and in making a new labyrinth seal in the central orifice of the replacement part.

Abstract: There is provided a nuclear power station primary pump of the type comprising a drive shaft for rotating a wheel, a heat exchanger, a thermal barrier cover comprising a peripheral skirt provided at its base with a circular end wall, and a diffuser comprising a peripheral skirt provided at its base with a rim. The circular end wall co-operates with the base of the heat exchanger to define a bottom chamber for cold water and includes a central bore provided with a succession of circumferential and superposed rings forming a lip seal of the labyrinth type, and a space is formed between the thermal barrier cover and the diffuser to maintain stagnant cooling fluid.

Abstract: Thermal protection shield for a rotating shaft The invention relates to a thermal protection shield for a rotating shaft, characterized in that it comprises, in the thermal transition region between the hot fluid and the cold fluid, a ring (11) of nickel alloy shrunk onto said shaft (1).

Abstract: The invention relates to a method of repairing the labyrinth seal of a diffuser in a primary pump, the diffuser being of the type comprising a peripheral skirt and a circular end wall having an orifice provided with the labyrinth seal. The method consists in making a bore in the circular end wall having a diameter greater than that of the orifice, in reducing the thickness of the remaining portion of the end wall, in forming a chamfer on the edge of the bore, in positioning a replacement part in said bore, the replacement part including a central orifice and a chamfer on its own peripheral edge, in making a bead of welding between the chamfers, and in making a new labyrinth seal in the central orifice of the replacement part.

Abstract: The invention provides a nuclear power station primary pump of the type comprising a drive shaft for rotating a wheel, a heat exchanger, a thermal barrier cover comprising a peripheral skirt provided at its base with a circular end wall, and a diffuser comprising a peripheral skirt provided at its base with a rim. The circular end wall co-operates with the base of the heat exchanger to define a bottom chamber for cold water and includes a central bore provided with a succession of circumferential and superposed rings forming a lip seal of the labyrinth type, and a space is formed between the thermal barrier cover and the diffuser to maintain stagnant cooling fluid.