Abstract: The invention relates to a steam generator, which consists of a combustion chamber (1), a radiation part (2) and a convection part (3) and which has at least two vertical gas passes (4, 5) following the combustion chamber (1), in each case with a 180.degree. deflection of the flue gas (12), the combustion chamber (1) and the gas pass (4) being separated from one another by means of a first partition (14) and the two gas passes (4, 5) being separated from one another by means of a second partition (6). It is defined in that the second partition (6) is designed, at its lower end, in such a way that the passage area for the flue gas (12) from the vertical pass (4) with downward flow to the vertical pass (5) with upward flow has a variable value over the width, the passage area being smaller in the middle than on the outside. The secondary flow occurring during deflection is thereby reinforced, in the wall region the vortices of said secondary flow rotating opposite to the direction of the main flow deflection.

Abstract: The invention relates to a main-burner arrangement of a combustion chamber (5), in particular for a gas turbine, at least two main-burner groups (13.1, 13.2), each comprising at least one burner (13) of the same size and geometry being provided for the purpose of equipping the combustion chamber (5), and at least one main-burner group representing the normal main burner(s) (13.1), the normal main burner(s) (13.1) producing a homogeneous flame front in the combustion chamber (5), and the other main-burner group interfering as an interference burner or burners (13.2) with the homogeneity of the flame front in the combustion chamber (5). In this burner arrangement, the interference burner(s) (13.2) is/are arranged in the combustion chamber (5) so as to be inclined or axially displaced in relation to the normal main burner(s) (13.1). This interferes with the symmetry and homogeneity of the flame front. The power of the combustion chamber is increased and pressure pulsations can be avoided.

Abstract: A converter circuit arrangement is specified. An extremely compact structure is achieved by virtue of the fact that the current rise limiting inductor concentrically surrounds the second stack containing diode and resistor. In particular, the inductor can be designed as a wire helix surrounding the stack. A very compact structure of the converter is produced, furthermore, by virtue of the fact that the first and second stacks, that is to say the stack of the switches and the stack of the snubber, belong to a common clamping lattice.

Abstract: A burner for liquid and/or gaseous fuels (A, B, C) for a premixing combustion system in graduated load operation of a combustion chamber includes at least one inner partial body (2) that extends in the flow direction; at least one outer partial body (4) which extends conically opposite to the inner partial body (2); and at least one other surrounding pipe (8). The inner and outer partial bodies form a central flow structure, whereby the two are supplied with the flow in effective connection with each other with combustion air (13, 14, 15). The main part of this combustion air (13) then flows through the two partial bodies through air inlet slits (11, 12) and forms one rotational flow in each of the adjoining flow chamber (5, 7).

Abstract: This switching device has a contact arrangement which is equipped with erosion-resistant contacts and comprises at least one contact which moves along a central axis (2) and at least one mating contact which is provided for receiving the moving contact. One of the two contacts has a finger cage (25) which is provided with individual, sprung contact fingers (13) which are spaced apart from one another by radial slots (26) extended in the direction of the central axis (2). Means are provided which prevent the side edges (29) of the contact fingers (13) being able to touch in the region of the contact surfaces (27) in the front part of the contact fingers (13) when said contact fingers (13) are drawn together in the direction of the central axis (2) , such that welding of the edges (29) of the contact fingers (13) cannot occur.

Abstract: A metal-enclosed, gas-insulated switchgear assembly having at least one active part (19) is mounted in an enclosure extended along an axis (18). The active part (19) is provided on at least one side with a contact-making assembly (25). The contact-making assembly (25a) is electrically conductively connected to a connecting part (26) which is provided with a shielding electrode (28). The shielding electrode (28) is connected to a supporting element (35) which bounds an intermediate area (40). The supporting element (35) is connected, on the side facing away from the shielding electrode (28), to a fitting (37) which has holes (39) which originate from the intermediate area (40) and are designed to hold fixing screws. The connecting part (26) is designed for advantageously simply assembly. The connecting part (26) dielectrically shields the heads of the fixing screws.

Abstract: The present invention discloses a power semiconductor module 10 having encapsulated submodules 1 which, for example, is suitable for power switches, rectifiers for the like in industrial or traction drives. The submodules 1 have a sandwiched structure made up of a ceramic substrate, one or a few power semiconductor chips and a molybdenum wafer, and are potted in plastic. They are held in plug-in locations 19 on a common baseplate 11 and make contact via a stack arrangement of conductors 12, 14, 18. Retention and contact of the submodules 1 take place reversibly via pressure contacts 15, 16, 20, clamp contacts 21 or the like. Important advantages of the power semiconductor module 10 relate to the simple and easily scaleable structure, improved ability to withstand thermal load cycles, and the robustness and easy interchangeability of the submodules.

Abstract: In a burner of the double cone type, at least one relief slit (30) is arranged in the front plate (18) locally between the regions having different axial expansions. The flexible connection remaining between the two outlet regions may be made integrally within the same casting or via a further welded-on part. Excessive thermal stresses are advantageously avoided thereby.

Abstract: In the case of a three-phase transformer which, per phase (U, V, W), has a primary-side winding (U.sub.PW, V.sub.PW, W.sub.PW) and a secondary-side winding (U.sub.SW, V.sub.SW, W.sub.SW), in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) are provided on each limb per phase (U, V, W). These in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) serve, by means of a tap switch 3 and a load switch 6, for in-phase regulation for the purpose of reactive volt-amperes distribution in electrical power supply networks. In addition, the in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) are operatively connected via a further load switch 5 and a further tap switch 4 to a booster transformer (2). The voltages across primary windings U.sub.B, V.sub.B, W.sub.B of the booster transformer 2 effect quadrature or phase-angle regulation of the phase voltages U.sub.P, V.sub.P, W.sub.P in the three-phase transformer 1.

Abstract: In a liquid cooling device (1) for a high-power semiconductor module (14), which contains a plurality of heat-generating submodules (8a-h) arranged next to one another on a cooling surface (3) and is fusion-bonded to the cooling surface (3), an improved load cycle resistance is achieved by the liquid cooling device (1) having a housing (2) which encloses a liquid space (4), through which a cooling liquid flows, and the upper side of which forms the cooling surface (3), and by the housing (2) of the liquid cooling device (1), at least in the region of the cooling surface (3), consisting of a metal-ceramic composite material, the coefficient of thermal expansion of which is adapted to the coefficient of thermal expansion of the ceramic substrates or of the power semiconductor devices of the submodules (8a-h) and, by additional means (11a-h; 12) for improving the heat transfer between the cooling surface (3) and the cooling liquid being provided in the liquid space (4) of the liquid cooling device (1).

Abstract: A low-pressure feedwater preheater or heater in power station plants, heated with bleed steam and having a two-pass tube bundle of the tube sheet type of construction, has a carrier design for the tube bundle having side plates (9) running parallel to the tube bundle and one or more supporting plates (8) disposed perpendicularly to the tube bundle. In the center of the bundle between the cold and the hot leg, a partition (11) extends along the entire length of the bundle leg. Arranged on either side of the partition (11) are suction tubes (12) through which non-condensable gases are drawn off in the zones of lowest pressure. According to the invention, the supporting plates (8) are each made of a single piece and are thus continuous, and the partition (11) consists of individual sheet-metal parts which are connected to the supporting plates (8).

Abstract: The present invention discloses a power semiconductor component 1 having a special pressure contact system which is suitable, for example, for circuit-breakers, rectifiers, or the like in industrial drives. A pressure-equalizing element 9 in the form of a box 10, 15 with a flowable or plastically deformable medium 12 is inserted between a pressure plunger 7a and a power semiconductor 2. Because of the hydrostatic pressure in the box 10, an inhomogeneous pressure delivered at one side is passed on to the other side as a homogeneous pressure. A homogeneous pressure delivery can be achieved, even in the edge region of the pressure surfaces 11a, 11b, by means of an inlet camber of the lateral surface 13. The box 10, 15 preferably consists of copper or AlSiC, and the medium 12 of a liquid metal (Ga, Hg), a plastic metal (Pb, Al) or of metal balls (Cu) in silicone oil.

Abstract: In an electric machine (10), in particular a generator or motor, which is accommodated in a machine housing (11) and comprises a stator winding which passes through a stator core (13) and which merges on the end face into an overhang (31) which is mounted in a braced manner in order to absorb dynamic loads, flexible readjustment is achieved by providing, on the overhang mounting, means (20, 21, 29, 30) for retensioning the overhang (31) which are actuable from outside the machine housing (11) and which allow retensioning during operation.

Abstract: A blade carrier for an axial-flow compressor is provided with cooling passages, through which a cooling medium flows in a closed circuit. The cooling passages run at least approximately in the peripheral direction inside the blade carrier and are located in a closed water circuit which essentially comprises a circulating pump (31), a pressure-keeping vessel (32) and a heat exchanger (35).The cooling passages are arranged in a ring shape, each cooling ring (27) being provided with a feed line (28) and a discharge line (29). At least every second successive cooling ring is attached to a separate cooling path in the longitudinal direction of the blade carrier.

Abstract: A converter circuit arrangement is specified having a rectifier, an intermediate circuit and an invertor connected thereto. In order to protect the circuit against failures and overvoltage, a protection circuit which comprises, in particular, varistors is connected between the two partial rectifiers of the rectifier.

Abstract: The object of the invention is to provide a nozzle ring for the exhaust-gas turbine of a turbocharger which, in addition to an improved service life, also guarantees a constant efficiency.According to the invention, this is achieved in that an radial expansion gap (20) is formed between the turbine casing (2) and the nozzle ring (11), and at least one seal (22) is arranged in the expansion gap (20). To this end, an encircling groove (21) accommodating the seal (22) is formed in at least one of the fastening elements (16, 17) of the nozzle ring (11) or in at least one of the components (3, 4, 5) which surround the fastening elements (16, 17).

Abstract: In an arrangement for fixing blades (5) to a rotor (1) or stator, a number of slots (7) which run helically on the circumferential surface of the body to be fitted with blades are provided, filling pieces (6) which serve to space apart the blades (5) and fix the blades (5) in a frictional manner being present between individual blade rows (3).

Abstract: A gas turbine having guide blades arranged between the combustion chamber and turbine rotor is improved by the guide blades 1.1 being integrated in the respectively associated combustion chamber 1.2. That is, the guide blades 1.1 and the associated combustion-chamber wall 1.2.1 are designed essentially in one piece and are constructed as a combustion-chamber/guide-blade unit 1. The latter sits in cold supporting structures 3.1 of the gas-turbine plant 3 and both together form cooling-air passages which allow the combustion chamber to be cooled in counterflow.

Abstract: In a method for welding age-hardenable nickel-base alloys, a workpiece (5) made from an age-hardenable nickel-base alloy (1, 2) is welded with filler material of the same composition as the base material. The weld metal (3) which is formed in so doing is covered by a sealed covering layer (4) comprising a ductile material and the workpiece (5) is subjected to hot isostatic pressing (HIP).

Abstract: A method for wet cleaning of the nozzle rings of exhaust-gas turbocharger turbines is based on thermal shock of the contaminants, and includes the steps of injecting water in repeated, relatively small amounts, into the exhaust duct immediately upstream of the nozzle ring. A delay between injections allows the nozzle ring to reheat to operating temperature so that each water injection causes a thermal shock. An apparatus to perform the method includes water injection nozzles installed in the exhaust gas casing and a control system. The method and apparatus provide improved cleaning using less water than in known methods.