Wind turbine comprising a rotor having a hub carrying one or more blades, an air intake and a nacelle, the hub being rotatably mounted on a frame and the frame extending forward into the hub, wherein an air flow passage is provided between an inside portion of the hub and the nacelle via at least one first opening to the hub.

A hollow forging process for main shaft of large wind turbine generator, wherein, comprising the following steps as: the first step of cutting off the dead head and the bottom of an ingot; the second step of upsetting and punching a hole; the third step of drawing-out; and the fourth step of local upsetting, drawing-out and shaping-up. In the fourth step, the forged piece is shaped up by local upsetting and drawing-out through a turnplate. The hollow forging process for main shaft created by the invention can save the costs for enterprise to purchase large equipment and makes it possible to forge the main shaft of large wind turbine generator with a free forging oil press with a smaller size.

A wind turbine, including a transmission, a transmission shaft acting as transmission output, a generator, a generator shaft acting as generator drive and a coupling connecting the transmission shaft and the generator shaft to one another, is characterized in that the generator shaft is designed as a hollow shaft, the coupling is disposed such that the coupling is connected to the generator shaft on the side of the generator facing away from the transmission, and the transmission shaft passes through the generator shaft and is connected to the coupling.

An arrangement, including a gearbox, a generator, an intermediate shaft configured as a hollow shaft which is mounted at least partially in a housing of the gearbox, wherein a rotor of the generator is non-rotatably connected to the intermediate shaft and is supported by the intermediate shaft, and an intermediate piece arranged at least partially in the intermediate shaft. An output shaft of the gearbox is non-rotatably and detachably connected to the intermediate piece. The intermediate piece is non-rotatably and detachably connected to the intermediate shaft.

The present disclosure is directed to a system and method for removing or installing a main shaft of a drivetrain assembly of a wind turbine to and from a nacelle installed atop a wind turbine tower. The rail system includes at least one support component configured to support the main shaft. Further, the support component is configured horizontally with respect to the main shaft. The rail system also includes at least one sliding component connected between the support component and the main shaft. Thus, the sliding component is configured to move horizontally with respect to the support component so as to slide the main shaft between an installed position and an uninstalled position.

A method for routing wires from a rotor shaft of a turbomachine includes routing a plurality of wire bundles through an end portion of the rotor shaft and into an annular extension shaft which is coupled to the end portion of the rotor shaft, threading each wire bundle through a corresponding thru-hole of a plurality of thru-holes defined in an annular wire barrel, inserting the wire barrel into the extension shaft and fixedly connecting the wire barrel to the extension shaft.

A power transmission system for a wind turbine includes a main shaft configured to be driven by the rotor about a main axis, a support structure including at least one bearing supporting the main shaft for rotation about the main axis, and a gearbox having a gearbox housing rigidly coupled to the support structure and a gearbox input member coupled to the main shaft. The gearbox housing supports the gearbox input member for rotation about the main axis, and the gearbox input member is coupled to the main shaft with a translational degree of freedom along the main axis and rotational degrees of freedom about axes perpendicular to the main axis. The main shaft is coupled to the gearbox input member by a flexible coupling positioned at least partially within the main shaft. The flexible coupling may be positioned entirely within the main shaft.

A device for mounting a line pipe in a rotor shaft of a wind turbine. The invention also relates to a rotor shaft for a wind turbine and to the wind turbine itself. The device includes a rotor shaft which is configured to be partially hollow and in which the line pipe is arranged. In the line pipe, different media are routed from a fixed nacelle of the wind turbine in the direction of a rotor hub connected to the rotor shaft. These can be not only electrical lines but also optical waveguides and media lines for gases and liquids. The mounting of the line pipe is achieved by a device having a plurality of eccentric fixing elements, wherein the line pipe is oriented concentrically by rotating the eccentric fixing elements.

A floating turbine system comprising a turbine comprising a central cylinder comprising a curved cylindrical surface, a first end face and a second end face opposite the first end face, wherein the first end face and the second end face are joined by a the curved cylindrical surface, and wherein the central cylinder has a sealed inner cavity; a plurality of helical vanes disposed on outer side of the curved cylindrical surface; wherein channels are formed between each of the plurality of helical vanes; and wherein the channels are configured to allow fish to pass along the channels.

Wind turbine, comprising a bedframe (2) having a cylindrical frame connection flange (11) and shaft (3) having a cylindrical shaft connection flange (16), wherein the shaft connection flange (16) is fixated to the frame connection flange (11) by screw connections arranged in axially extending bores provided in the frame connection flange (11) and the shaft connection flange (15), wherein the frame connection flange (11) is provided with a first row (Ia) of first through bores arranged at an outer first frame radius and the shaft connection flange (16) is provided with a first row (Ib) of first threaded blind bores (21) arranged at an outer first shaft radius which corresponds to the first outer frame radius, the frame connection flange (11) is provided with a second row (IIa) of second threaded blind bores (26) arranged at an intermediate second frame radius and the shaft connection flange (16) is provided with a second row (IIb) of second through bores (27) arranged at an intermediate second shaft radius which corresponds to the intermediate second frame radius, the frame connection flange (11) is provided with a third row (IIIa) of third threaded blind bores (31) arranged at an inner third frame radius and the shaft connection flange (16) is provided with a third row (IIIb) of third through bores (32) arranged at an inner third shaft radius which corresponds to the inner third frame radius, wherein a through bore is flush with a threaded bore and a screw connection (22, 28, 33) extends through the through bore and is screwed into the threaded blind bore.