A vacuum pump comprises: a pump device configured to rotate a rotor about a rotation axis supported by a ball bearing, thereby discharging gas sucked through a pump suction port from a pump exhaust port; and a control device attached to a side surface along a direction of the rotation axis of the pump device, including an electronic circuit having a heat generation element and a housing configured to house the electronic circuit, and configured to control operation of the pump device. The heat generation element directly contacts an outer plate of the housing not contacting the pump device, and does not contact an outer plate of the housing contacting the pump device.

A turbo fluid machine includes a housing, a rotating member, and a motor. Part of fluid compressed by a compressor impeller is introduced into a motor accommodation space through an inlet-side flow passage that has an inlet-side fixed throttle, and is discharged from the motor accommodation space through an outlet-side flow passage that has an outlet-side fixed throttle. The outlet-side flow passage includes a connection part connecting to the motor accommodation space. The connection part is formed separately from a clearance between a second partition wall and a shaft, and is located opposite to a connection part of the inlet-side flow passage connecting to the motor accommodation space across the motor in an axial direction of the shaft. The inlet-side fixed throttle and the outlet-side fixed throttle are configured such that pressure in the motor accommodation space is higher than pressure in a turbine-wheel back pressure region.

Provided is a nacelle for a wind turbine extending along a longitudinal axis and including an outer surface and an heat exchanger on the outer surface, the heat exchanger including a plurality of fluid passages for a fluid to be cooled in the heat exchanger and a plurality of air passages for a cooling air flow in thermal contact with the fluid passages, the air passages extending between an inlet surface and an outlet surface of the heat exchanger. The inlet surface is inclined with respect to the longitudinal axis of an installation angle between 0 and 90.

A power generator is provided that in some embodiments includes a tubular generator housing for receiving a fluid flow at an intake end and discharging the fluid flow at an exit end. A generator compartment located within the generator housing contains an electrical generator. The generator compartment includes a plurality of structural members for centrally locating the generator compartment within the generator housing. A thickness of a thermally conductive outer wall of the generator compartment tapers from a thickest portion in front of the electrical generator to a thinnest portion adjacent to the electrical generator.

Contoured fan blades and associated systems and methods are disclosed herein. A representative embodiment includes a hub and multiple curved fan blades circumferentially arranged around, and coupled to, the hub. Individual fan blades can have a tip, a first curved edge, and a second curved edge. The first and second curved edges extend over at least part of the length between the hub to the tip of the fan blade. The fan blade is formed with multiple upper channels and multiple lower channels. The multiple upper and lower channels extend from the first curved edge to the second curved edge.

A retaining structure-based heat transfer and dissipation system and a wind generator set are provided. The heat transfer and dissipation system includes a envelop enclosure and power transmission cables that are laid along the vertical direction of the inner wall of the envelop enclosure. The power transmission cables are laid in a shady surface region of the envelop enclosure. The system effectively lowers the surface temperature of the power transmission cables in the envelop enclosure, prolongs the service life of the power transmission cables, and ensures the operation safety of power transmission. The over-temperature problem of the power transmission cables in a tower drum of the wind generator set in a high-temperature natural geographical environment is resolved in a green and zero-energy consumption manner, and the system safety of power transmission is improved.

A wind turbine drive train component (22) comprising a rotating shaft (61) with a radial seal (50) is provided. The radial seal (50) comprises a stationary part and a rotating part. The stationary part comprises a ring (51) with an inner edge and an outer edge, the inner edge being configured for contactlessly surrounding the shaft (61). The rotary part comprising a disc (52), coaxially connected to the shaft (61) for rotation therewith and comprising a flange (53) that wraps around the outer edge of the ring (51). The radial seal (50) further comprises an annular air lock gap (55) for containing an amount of lubrication fluid (64) and thereby closing off the air lock gap (55) when the rotary part rotates at a rotational speed above a predetermined threshold speed, the annular air lock gap (55) being formed by an inner surface of the flange (53), an outer part of the opposing parallel surface of the disc (52) and the outer edge of the ring (51).

A design method of a heat dissipation system of a wind generator system for severe environments includes constructing an outer air duct of the heat dissipation system; determining a suction air amount of the outer air duct; setting an air velocity of an air inlet of the outer air duct; determining an area of the air inlet of the outer air duct; providing the air inlet; and designing a settling chamber. With these steps, the original heat dissipation system of the wind generator system is additionally provided with the outer air duct. Further, the area of the air inlet is controlled to allow the air velocity at the air inlet to be 3 m/s to 4 m/s, thus rare or no suspended substances are suctioned into the outer air duct, and the radiators of the original heat dissipation system suction cooling air from the outer air duct.

A cooler has individual cooling elements (1) of stacked construction having ducts (25) extending in parallel to one another, Each duct delimits a flow chamber (29) for the throughflow of a liquid medium to be cooled. Between each pair of ducts. at least two layers (3, 5) of individual rows of meandering fins (34) extend for the throughflow of air and jointly delimit a further flow chamber (26, 28) each. The respective one flow chamber (29), free of obstacles, permits a laminar flow of the liquid medium through the assignable duct (25) in one throughflow direction. The height (H1) of each fin (34), viewed transversely to the direction of throughflow of the liquid medium, has at least the same height as the free throughflow cross section of the flow chamber (29) of the adjacently arranged duct (25), viewed in parallel to the extension of the respective fin (34). In every layer (3, 5), a plurality of rows (36) of several fins (34) are arranged in succession, which each viewed in the direction of throughflow of the duct (25) are offset from each other.

The invention relates to a wind turbine rotor blade with a length, a rotor blade root, a rotor blade tip, a pressure side, a suction side, a leading edge, a trailing edge and an air guide for heated air for guiding heated air inside of the rotor blade and along a longitudinal direction of the rotor blade from the rotor blade root in the direction of the rotor blade tip. The wind turbine rotor blade also comprises at least two air guide sections and at least one heat exchanger for conveying heat from one air guide section to another air guide section.