摘要:
Process for shaping any desired metallic and/or ceramic component, in which a dry powder is filled loosely into a ceramic mold, which elastically/plastically yields or cracks and breaks under the influence of shrinkage stresses during sintering, and is sintered. Variants for the mold: thin, resilient shells made of Al.sub.2 O.sub.3, SiO.sub.2 or MgO; special glass which cracks in a network-like manner; a mold having predetermined breaking points, ceramic shell disintegrating into fragments; flexible green ceramic sheeting; green ceramic composition with shrinkage during sintering.
摘要:
A positioning device for an air valve arranged in the charging air line of a diesel engine, particularly charged by means of a pressure wave-charging device. The air valve or flap is provided with a shutoff valve incorporated into the flow path between an impingement line branching-off from a pressure oil line of the diesel engine and an oil return flow line. The impingement line is connected with an impingement chamber for a positioning piston actuating the air valve or flap. The positioning piston is loaded by a continuously effective force and the shutoff valve is actuated, in order to impinge the positioning piston with oil, in the opening direction of the air valve or flap by a control piston loaded by the pressure in the air charging line against the force of a spring. The shutoff valve interposed between the impingement chamber and the oil return flow line, in the presence of an oil pressure for impinging the positioning piston with pressurized oil, is moved by the charging air pressure in the charging air line out of its open position into its closed position, and the closed shutoff valve, only in the absence of oil pressure for oil pressure relief of the positioning piston, can be controlled by the spring force from its closed position into the open position.
摘要:
A multi-flow gas-dynamic pressure-wave machine, the rotor of which comprises at least one intermediate tube which subdivides the cell zone into at least two flow channels. The cell walls of adjacent flow channels are circumferentially staggered by essentially one-half the circumferential interface between such cells to produce a reduction in noise due to the beat interference produced by the sound pressures occurring in the cells adjacent to one another in the radial direction. The rotor may be provided with a concertina-shaped or undulation-shaped intermediate tube whereby there occurs a more balanced distribution of stresses, requiring less accelerating power.
摘要:
A pressure exchanger cell ring comprising a rotor which, viewed in cross-section, possesses cell walls of at least double curvature, each of the cell walls being secured at its ends to the hub and shroud, respectively, of the rotor. Each cell wall is shaped to have protruding portions or lobes, each curving to either side of a radius extending through one of both attachment locations of the cell wall. The sector angle enclosed between the two radii extending from the center of the rotor through each attachment location of a cell wall does not exceed 4.degree., and the sector angle bounding the mean camber line of the cell wall does not exceed 7.degree..
摘要:
A process and a device for coating a temperature-stable component with a thermal protection layer (15), in which the temperature-stable component has a surface (12) which is to be coated with the thermal protection layer (15) and at which there is at least one cooling-passage opening (1) which is connected to a cooling passage running inside the component. During the coating a mass flow (10) emerges through the cooling-passage opening (1), the coating takes place by a coating mass flow (11) directed onto the surface (12) which is to be coated, and the mass flow (10) emerges through the cooling-passage opening (1) and the coating mass flow (11) include an angle &agr;≠0°.
摘要:
The invention relates to a gas turbine seal, comprising a metallic component (1) with a durable or erosion-resistant ceramic coating (2) and an abradable ceramic layer (18) which is arranged thereon in locally delimited fashion, a bond layer (5) being arranged on the surface (4) of the metallic component (1), to which bond layer the durable or erosion-resistant ceramic coating (2) is applied as a covering layer. The invention is characterized in that the bond layer (5) comprises separate, adjacent spherical rivets (6) or mushroom-shaped rivets (6) which have a web (7) and a head (8). These rivets form individual metal islands with numerous undercuts (12), around which there is a continuous ceramic network. It is possible to produce very thick layers which have a good bond strength, the ceramic not being flaked away even in the event of introduction of radial/tangential forces, sickle-shaped contact or locally high overheating/frictional heat, and a good sealing action being achieved.
摘要:
Blading for a rotating thermal machine consists of an airfoil (1), a root (4) and a shroud plate (5) or a shroud, the tip (2) of the airfoil (1) having a spigot-type step (11) with a semi-circular groove (12) extending around the whole periphery of its generated surface. The shroud plate (5) or the shroud has a recess corresponding to the step (11) with a semi-circular groove (8) extending around the complete periphery. At least one piece of a firmly seated heat-resisting wire (10) is located in the circular duct formed by the grooves (8, 12) as the fastening element between the components (1, 5). The blading is manufactured by pushing and/or pulling the wire (10) sideways into the duct formed by the grooves (8, 12). Optimum material combination, particularly for highly loaded gas turbine blading, is possible by selecting an oxide-dispersion-hardened superalloy with longitudinally directed columnar crystals for the airfoil (1) and a non-oxide-dispersion-hardened cast or forged superalloy for the shroud plate (5) or the shroud.
摘要:
The pressure wave supercharger of the internal combustion engine has a diaphragm capsule (20) for controlling the supercharge air butterfly (14). The diaphragm (21) of the diaphragm capsule is, in operation, subjected on the butterfly side to the high pressure air in the high pressure air duct (2) and on the other side to the pressure at the protrusion 27 or in the compression pocket (5), via a control pressure line (26; 28). These pressures typical of the process vary with the speed of the cell rotor and control the setting of the supercharge air flap as a function of the speed and loading condition of the engine.
摘要:
An actuator for an air valve placed in the boost air duct of an IC engine and, more specially, of such an engine supercharged or boosted by a pressure wave supercharger, the air valve being in its closed position on starting up the IC engine from cold, at which time the engine takes in charge air by way of a breather valve, and at the end of the starting stage the valve in the boost air duct is moved into its open position and is kept open while the engine is running. After shutting down the engine, the valve in the intake pipe is automatically moved back into its closed position and the air valve is moved into its open position by the pressure of the air forced into the boost air duct and/or by vacuum against an air valve spring closing force.
摘要:
A device separates foreign particles from cooling air fed to turbine rotor blades. The cooling air is fed directly or indirectly via stationary nozzle units to an annular space between wall parts of a turbine stator and rotating wheel disk as a cooling-air stream in the circumferential direction. The annular space communicates with ducts, arranged in the disk, for feeding the cooling air into the blades. A diverter unit is provided inside the annular space or so as to delimit the annular space on one side, so cooling air emerging from the nozzle units, before entering the ducts, is diverted on one side and foreign particles are centrifugally thrown into a radially outer part of the annular space and separated therefrom with a barrier-air fraction. The diverter unit has a surface region on which the stream impinges so it can be diverted radially outward through an angle greater than 90°.