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.

The fluid pump according to the present invention has water storage means that is formed so as to communicate with a shaft hole in a pump case and stores fluid leaking from a mechanical seal. An electromagnetic clutch establishes or blocks the transmission of power to a drive shaft by switching between supply and non-supply of electricity to an excitation coil. The water storage means has a weep chamber that communicates with the shaft hole between the mechanical seal and a bearing and is opened to an end portion in the axial direction. An attachment member for attaching a core of the electromagnetic clutch to the pump case seals the opening of the weep chamber.

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).

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.

The disclosure provides a sealing system applicable for an ocean power generation device, which includes at least one first seal and a water leakage protection device. The water leakage protection device is located at a side of at least one first seal away from seawater, and includes a sealed water storage tank and a drain pipe. The sealed water storage tank collects and stores seawater leaked from the at least one first seal. One end of the drain pipe is communicated with the sealed water storage tank, and the seawater stored in the sealed water storage tank is discharged through the drain pipe.

Lubrication method and wind turbine comprising a rotor with a hub supported by a main bearing with two opposite bearing races coaxially spaced by rotatably fitted bearing rollers in a lubrication area which is sealed by oil sealing rings between the bearing races. The lubrication area comprises one or more oil inlets operatively connected to an oil supply, and one or more oil outlets. The vertical distance between the outlet(s) and the lowest point of the lubrication area is 0-0.2 times the inner diameter of the outer bearing race. The inlet (s) and the oil supply are configured to supply an oil flow not exceeding the drain capacity of the one or more outlets.

The fluid pump according to the present invention has water storage means that is formed so as to communicate with a shaft hole in a pump case and stores fluid leaking from a mechanical seal. An electromagnetic clutch establishes or blocks the transmission of power to a drive shaft by switching between supply and non-supply of electricity to an excitation coil. The water storage means has a weep chamber that communicates with the shaft hole between the mechanical seal and a bearing and is opened to an end portion in the axial direction. An attachment member for attaching a core of the electromagnetic clutch to the pump case seals the opening of the weep chamber.