A hydraulic turbine includes a runner having a shaft, a runner crown, and a runner tip. Blades are fixed to the runner crown and are rotatable around an axis of rotation in operation of the hydraulic turbine, each blade including a leading edge and a trailing edge. A first chamber is located between the runner crown and a stationary head cover, or within head cover. A second chamber is located in the runner tip. A passage for water is defined between the first chamber and the second chamber. The runner crown has an upper portion and a lower portion, the upper portion having a larger diameter than the lower portion such that a channel is defined between the upper and lower portions. The channel has a circular shape and a circular symmetry around the axis of rotation and leads to a discharge region below the runner.

A shaft seal for an exhaust fan. The seal limits leakage from within an exhaust fan housing around an exhaust fan drive shaft that extends between a rotational power source exterior to the exhaust fan housing and a position within the exhaust fan housing. The seal comprises a plenum generally positioned about the exhaust fan drive shaft at the point where the shaft extends into the fan housing; an auxiliary blower comprising a housing, an internal blade driven by an auxiliary blower drive shaft, and an auxiliary blower drive to rotate the drive shaft where the auxiliary blower drive is operatively associated with the rotational power source such that operation of the rotational power sources causes a rotation of the exhaust fan drive shaft and the auxiliary blower drive shaft; and a duct fluidly connecting the auxiliary blower housing to the plenum.

In a water pump, a water reservoir portion into which cooling water leaking from between a bearing portion and a rotating shaft flows via an introduction hole is divided into a first division portion and a second division portion by a gasket. The first division portion and the second division portion communicate with each other through a communication hole formed in the gasket. The second division portion includes a drain hole through which cooling water is discharged to outside.

A pump seal leakage detection system (8) includes a leakage piping (13) including a collector pipe (21) and an air stream pipe (23), a sensor (15) positioned at the air stream pipe (23), and an air displacement device (17) for driving an air stream through the air stream pipe (23). The collector pipe (21) includes an inlet port (25) that is connectable to a leakage centrifuge (5), and an outlet port (27) into the air stream pipe (23). The sensor (15) is configured to detect a leakage drop at the outlet port (27) of the collector pipe (21) or in the air stream pipe (23). The air displacement device (17) is configured to blow a leakage drop off the outlet port (27) of the collector pipe (21) by an air stream towards an outlet port (35) of the air stream pipe (23).

The pump includes a rotational shaft (1), an impeller (3) fixed to the rotational shaft (1), a casing (2) that houses the impeller (3), a double mechanical seal (20), a seal chamber (25) that houses the double mechanical seal (20), an oil reservoir (30) configured to store oil, an oil supply line (26) providing fluid communication between the oil reservoir (30) and the seal chamber (25), a first oil pump (31) configured to pressurize oil supplied from the oil reservoir (30) and deliver the oil to the seal chamber (25), a second oil pump (42) arranged in parallel with the first oil pump (31), an oil outlet line (27) coupled to the seal chamber (25), and a pressure retaining mechanism for retaining pressure of oil in the seal chamber (25).

A bearing arrangement for a wind turbine including a bearing housing and a drive shaft, whereby the drive shaft is arranged within the bearing housing in an axial direction along a longitudinal axis of the bearing housing, the bearing arrangement further comprising a downwind bearing and an upwind bearing as radial fluid bearings, whereby the downwind bearing and the upwind bearing are arranged between the bearing housing and the drive shaft is provided. The downwind bearing and/or the upwind bearing includes a lubricant flooded chamber, in which multiple radial bearing pads are arranged about the drive shaft, whereby the lubricant flooded chamber is sealed against the drive shaft, an internal space of the bearing housing and an outside of the bearing housing is also provided.

Provided is a bearing arrangement for a wind turbine c including a bearing housing and a drive shaft, whereby the drive shaft is arranged within the bearing housing in an axial direction along a longitudinal axis of the bearing housing, the bearing arrangement further including a downwind bearing and an upwind bearing as radial fluid bearings, whereby the downwind bearing and the upwind bearing are arranged between the bearing housing and the drive shaft, the bearing arrangement further including an axial bearing. The axial bearing includes an axial collar, whereby the axial collar is integrally formed with the drive shaft.

Provided is a bearing arrangement for a wind turbine including a bearing housing and a drive shaft, whereby the drive shaft is arranged within the bearing housing in an axial direction along a longitudinal axis of the bearing housing. The bearing arrangement further includes a downwind bearing and an upwind bearing, whereby the downwind bearing and the upwind bearing are arranged between the bearing housing and the drive shaft. The bearing housing includes a drain outlet arranged in a bottom part of the bearing housing, the bottom part of the bearing housing being located underneath the drive shaft in a direction of gravity, whereby at least one inner side of the bottom part of the bearing housing is arranged so as to form a funnel, whereby the drain outlet is an opening of the formed funnel.

A shaft seal device is fixed to a container that separates a high-pressure fluid and a low-pressure fluid from each other, and seals a shaft-penetrated portion of the container through which a rotational shaft extends. This shaft seal device includes: a seal casing having a through-hole through which the rotational shaft extends, the seal casing having a seal chamber which communicates with the through-hole and into which the high-pressure fluid flows; and a disk-shaped seal body which is housed in the seal chamber, the seal body being rotatable together with the rotational shaft and having an annular surface perpendicular to an axis of the rotational shaft. An inner surface of the seal casing, which faces the annular surface of the seal body and defines the seal chamber, is a flat surface perpendicular to the axis of the rotational shaft.

Provided is a nacelle for a wind driven power plant, the nacelle including a nacelle bottom cover, wherein the nacelle bottom cover includes two or more segments, each of the segments being configured to contain a respective predefined maximum volume of a liquid in a receptacle in a case of leakage, and wherein the respective receptacles are configured to collectively contain a total volume that corresponds to a total amount of liquids in the wind driven power plant, in particular a total amount of lubricating oils and/or cooling liquids in the wind driven power plant. Also provided is a wind driven power plant including the nacelle and a wind park including a plurality of the wind driven power plants.