摘要:
Confronting and slidable roll holders include lateral supports between which a compression spring is arranged for forcing the rolls carried by the roll holders towards each other by pushing the supports apart. The rolls are thus maintained in contact with rails interspersed between the rolls and the roll holders are maintained in position against each other by link rods formed of insulation material.
摘要:
An electrochemical generator (e.g. a battery) which is rechargeable electrochemically with liquid electrolyte having negative electrodes of zinc and the positive non-porous electrodes that are contacted on the same face by the electrolyte and an oxygen-containing gas. The generator or battery comprises a repetitive unit of groups of thin, plate-like, components, each group having a total thickness that is preferably smaller than about 1 millimeter and comprising an impervious bipolar electrode, a microporous membrane, and means for maintaining an essentially constant spacing between said bipolar electrode and the membrane. These generators are capable of providing long service lives and/or a large specific power or output.
摘要:
A layer of refractory metal for example of tungsten or molybdenum, and about one micron thick is prepared in accordance with a predetermined pattern by masking by applying the refractory metal on a substrate which may be conductive or is close to a conductor; the refractory metal is covered by a protective layer, in the mask pattern. The protective layer may, in turn, have been covered with a photoresist and have been partly etched away. The masked, continuous layer of refractory metal is exposed to an electro-erosive environment which selectively attacks only the refractory metal but does not attack the protective masking layer, and the exposed refractory metal layer is removed; the masking layer is then dissolved in a substance which is inert with respect to the refractory metal. The refractory metal may be removed by placing the metal in an ionized gaseous medium or by electrolytic compositions. A suitable protective layer is silicon nitride.
摘要:
Device comprising a body whose base is surmounted by a cylindrical head intended to be inserted and held in an opening provided in the wall, characterised in that it comprises clamping means comprising, on the one hand, screws provided with means for synchronising their movement, arranged in tappings formed in the periphery of the body parallel to the axis of the cylindrical head and leading, round the latter, towards the rear face of the wall and, on the other hand, clamps for reacting against clamping forces developed by the screws and pressure against the front face of the wall.
摘要:
A winding bar for an electrical machine formed by a plurality of radially superimposed conductors each made up of a plurality of tangentially disposed strands, the conductors being periodically radially transposed in position and the strands being periodically tangentially transposed in position.
摘要:
In the cooling with gas of the rotor winding heads of rotary electric machines, such as turbogenerators, having axial inlet and outlet channels for the gas disposed under the winding heads, channels are made up of a succession of axial notches within the shaft of the rotor, closed by an insulating tube which is pressed against the winding heads by centrifugal force and equipped with sealing bands or seals gliding in grooves located in the rotor shaft between the axial notches.
摘要:
To improve efficiency and space factor, compressed gas at ambient temperature is supplied to the inside of a housing which contains electrical apparatus to be operated at cryogenic temperature, the gas being expanded and supercooled inside the housing, with possible additional cooling stages located therein; heat exchangers, in the form of heat exchange shields are located within the housing intermediate the housing walls and the electrical devices to be supercooled. Typical electric devices are superconductive coils, cables and the like, the cooling fluid being conducted, if desired, through hollow portions of the devices.
摘要:
An improved electrode structure wherein the electrode is a nonporous embossed sheet. The electrode surface contains a plurality of projections arranged in bands. Each band occupies an area and the top and bottom of the band are substantially parallel to one of the margins and substantially perpendicular to the direction of contemplated fluid flow across the electrode. Each band of projections is an array of parallel elongated ridges inclined to said direction of fluid flow. The angle of said inclination is such that d sin Alpha ne, wherein d is the distance between said top and bottom of said band, e is the distance between two adjacent ridges, and n is a whole number. The angle of inclination must also fall between 15* and 30*. The invention also includes a fuel cell comprising a stack of said electrodes.
摘要:
A steam gas plant comprising a gas turbine, a steam generator with burners fed by the exhaust gases of the gas turbine a steam turbine fed by the steam generator wherein steam is extracted at various points of the steam turbine to feed a deaerator receiving water from water heaters and returning the water to the steam generator, the extracted steam being fed into the deaerator through channels controlled by nonreturn valves and, in at least one of such channels a gate controlled by the pressure prevailing in the deaerator so as to maintain the pressure substantially constant.
摘要:
An extinction device for a pressurized gas cut-off appliance has holes, in its side walls, through which a lateral auxiliary flow of sulphur hexafluoride is made to pass.