Abstract: Method for manufacturing a rotor of a fluid flow machine, including: connecting rotor disks with radial welds to form a hollow passage running around the rotor axis and interrupting the welds such that welds facing a rotor are directly adjacent the hollow passage; inserting a one-piece rotor ring between two directly adjacent rotor disks so one side of the rotor ring abuts against the first rotor disk centering lip; welding the two rotor disks to one another along a weld extending in a direction of the rotor axis starting from the hollow passage enclosed by the two rotor disks, a region of the hollow passage facing away from the rotor being at least partly open at the hollow passage's peripheral outside; displacing the rotor ring toward the second rotor disk; positioning the rotor ring over the hollow passage; and welding the rotor ring to the first, then the second, disk.

Abstract: Two methods for the manufacture of a welded rotor of a fluid-flow machine are described, through which rotor: a cooling medium flows through inflow and outflow passages inside the rotor and which is composed of a plurality of rotor disks, which are connected to one another by welds running radially or largely radially relative to the rotor axis and in each case enclose with one another a hollow passage, which runs around the rotor axis and interrupts the welds in such a way that a weld facing the rotor is directly adjacent to the hollow passage.

Abstract: A method for manufacturing a welded rotor of a fluid-flow machine are described, through which rotor a coiling medium flows through inflow and outflow passages inside the rotor and which is composed of a plurality of rotor disks, which are connected to one another by welds running radially or largely radially relative to the rotor axis and in each case enclose with one another a hollow passage, which runs around the rotor axis and interrupts the welds in such a way that a weld facing the rotor is directly adjacent to the hollow passage.

Abstract: A device for training a baseball pitcher has a baseball catching element operative for catching a baseball, a baseball throwing element operating for throwing a caught baseball in accordance with a catapult principle, and a drive connecting with the baseball throwing element and actuating the baseball throwing element when the baseball is received by the baseball throwing element.

Abstract: A device for training a baseball pitcher has a baseball catching element operative for catching a baseball, a baseball throwing element operating for throwing a caught baseball in accordance with a catapult principle, and a drive connecting with the baseball throwing element and actuating the baseball throwing element when the baseball is received by the baseball throwing element.

Abstract: Two methods for the manufacture of a welded rotor of a fluid-flow machine are described, through which rotor a cooling medium flows through inflow and outflow passages inside the rotor and which is composed of a plurality of rotor disks, which are connected to one another by welds running radially or largely radially relative to the rotor axis and in each case enclose with one another a hollow passage, which runs around the rotor axis and interrupts the welds in such a way that a weld facing the rotor is directly adjacent to the hollow passage.

Abstract: The arrangements according to the invention and the methods according to the invention serve to seal a gap 20 against a primary fluid 10 by means of a secondary fluid 11 in a fluid-dynamic and non-contact manner, which primary fluid 10 flows over the gap 20. The secondary fluid 11 forms a preferably rotating vortex flow 13 in the gap in at least one or more sections along the gap. The flow of the secondary fluid 11 is preferably guided in a chamber 26, which is arranged in the gap 20. The chamber 26 is designed as a rotary chamber along the entire gap 20 or also as a local chamber 226 extending only locally along the gap. The secondary fluid 11 may be supplied via supply conduits 40, in which the gap 120 itself may be utilized for supplying secondary fluid 115 to the chamber 126. As further elements for the guidance of the vortex flow, guiding lips 50, undercuts of the chamber contour 351, and guiding elements 160 may be arranged in the gap.

Abstract: According to the invention, turbine blades are provided that have increased functional reliability, which is achieved in that the interior space (8) of the blade body (3) in the region of the suction-side wall (4), the pressure-side wall (5) and the trailing blade edge (7) has a closed steam-cooling system (9) having at least one cooling passage (10, 27, 28). An open cooling system (11) having at least one cooling passage (14, 15) and a plurality of film-cooling holes (22) which pass through the blade body (3) is formed in the region of the leading blade edge (6).

Abstract: In a turbo engine's welded rotor includes a number of disks, the radially or quasi-radially extending welding seams are intermediately interrupted by annular cavities through which a cooling medium flows, and these cavities are surrounded by a circumferentially extending insert ring. This insures the flow of the cooling medium through the entire rotor without reducing the strength of the welding bond.

Abstract: A gas-turbine blade of solid construction and having cooling passages is specified, which cooling passages run in its interior and through which the cooling medium flows essentially from the blade root through the gas-turbine blade (100), these cooling passages (20) having a relatively small cross section in relation to the blade thickness and being arranged so as to run close to the lateral surface (100.1) of the gas-turbine blade (100), and the cooling-medium feed and discharge being effected in the base (60) of the gas-turbine blade (100).

Abstract: A pneumatic vehicle tire comprising a tread strip which forms the tire tread and is made from an electrically insulating or poorly conducting material and comprising, beneath the tread strip, a layer which is a good electrical conductor wherein, in order to bring about an adequate dissipation of electrical charge from the vehicle bodywork, the layer which is of good electrical conductivity extends at least regionally up to and into the tire running surface when considered over the circumference of the tire.

Abstract: For the purpose of separating dust particles inside a cooling system of a rotor, fitted with moving blades, of a turbo-machine, a device is arranged upstream of the moving blades to be cooled and in the region of the rotor outer surface. The device has at least one feed channel through which a coolant flows, and is directed in the radial direction such that the dust particles located in the coolant accumulate on the side accelerating in the direction of rotation of the rotor. These dust particles subsequently pass into a separation chamber operationally connected to the feed channel and in which they are captured in order then to be discharged.

Abstract: To improve wall cooling, especially at gas turbine elements, such as buckets or blading, combustion chambers, infeed channels and so forth, it is proposed to arrange a partition wall between an outer plate and an inner plate, for instance formed of sheet metal. The partition wall forms a cooling agent chamber and a pressure equalization chamber. The partition wall preferably consists of a buckle plate whose bulges or protuberances are connected, as by welding, with the outer plate. There is maintained within the pressure equalization chamber a pressure which approximately corresponds to the hot gas pressure at the outer surface of the outer plate, so that there are avoided so-called boiler stresses.