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A water flow electricity generating device includes: an annular stator in which a coil is provided; a permanent magnet that causes a magnetic force to act on the coil; a rotor main body that is disposed on an inner circumferential side of a stator core to support the permanent magnet; a blade suppor

A water flow electricity generating device includes: an annular stator in which a coil is provided; a permanent magnet that causes a magnetic force to act on the coil; a rotor main body that is disposed on an inner circumferential side of a stator core to support the permanent magnet; a blade support unit that is provided on a front side of the rotor main body; a rotor that includes a rotating blade projecting radially outward from the blade support unit; and water-lubricated bearings that are provided in the stator while being opposed to the rotor main body, the water-lubricated bearings supporting loads in a thrust direction and a radial direction. The blade support unit is disposed on a front side of the rotor main body, and the rotor includes a float unit that is provided on the front side of the rotor main body.

대표청구항 ▼

1. A water flow electricity generating device comprising: a stator that supports an annular stator core in which a coil is provided;a rotor that includes a magnet, a rotor main body, a blade support unit, and a rotating blade, the magnet causing a magnetic force to act on the coil, the rotor main bo

1. A water flow electricity generating device comprising: a stator that supports an annular stator core in which a coil is provided;a rotor that includes a magnet, a rotor main body, a blade support unit, and a rotating blade, the magnet causing a magnetic force to act on the coil, the rotor main body being disposed on an inner circumferential side of the stator core to support the magnet, the blade support unit being provided on one side in a rotating axis line direction of the rotor main body, the rotating blade projecting radially outward from the blade support unit;a water-lubricated bearing that is disposed while being opposed to the rotor main body, the water-lubricated bearing supporting loads in a thrust direction and a radial direction; andan air volume adjusting device,wherein the blade support unit is disposed on one side in the rotating axis line direction of the rotor main body,the rotor includes a float unit that is disposed on one side in the rotating axis line direction of the rotor main body, andthe air volume adjusting device adjusts an air volume in the float unit. 2. The water flow electricity generating device according to claim 1, wherein the float unit is provided on one side in the rotating axis line direction of the blade support unit. 3. The water flow electricity generating device according to claim 1, wherein the water-lubricated bearing includes: a first water-lubricated bearing; and a second water-lubricated bearing that is disposed between the first water-lubricated bearing and the blade support unit, andan area of a radial surface that supports the load in the radial direction in the second water-lubricated bearing is larger than an area of a radial surface that supports the load in the radial direction in the first water-lubricated bearing. 4. The water flow electricity generating device according to claim 1, comprising: a headrace that conducts water to a surface of the water-lubricated bearing, the surface being opposed to the rotor main body;a water supply device that supplies the water to the headrace; anda water supply control device that controls an operation of the water supply device. 5. The water flow electricity generating device according to claim 4, wherein the water-lubricated bearing includes: the radial surface that supports the load in the radial direction; and a water discharge hole that is opened radially inward in the radial surface so as to be opposed to the rotor main body,wherein the headrace is communicated with the water discharge hole, andthe water supply control device controls the water supply device such that the water is discharged from the water discharge hole at beginning of rotation of the rotor. 6. The water flow electricity generating device according to claim 4, wherein the water-lubricated bearing includes: a thrust surface that supports the load, which is generated in the rotor such that the water flow impinges on the rotating blade, in the thrust direction; and a water discharge hole that is opened in the thrust surface toward an opposite direction to a water flow direction so as to be opposed to the rotor main body,wherein the headrace is communicated with the water discharge hole, andthe water supply control device discharges the water from the water discharge hole in rotating the rotor. 7. The water flow electricity generating device according to comprising: a sensor that can detect a flow rate of the water flow or a parameter, the parameter increasing or decreasing with increasing or decreasing flow rate of the water flow when a pitch angle of the rotating blade is kept constant;a pitch-angle driving device that changes the pitch angle of the rotating blade; anda pitch-angle control device that controls the pitch-angle driving device according to a value detected by the sensor. 8. The water flow electricity generating device according to claim 7, wherein a hydraulic cylinder is used as the pitch-angle driving device. 9. The water flow electricity generating device according to claim 7, wherein the pitch-angle control device performs the pitch-angle driving control to set an electricity generating capacity to a rated electricity generating capacity when the value detected by the sensor is larger than the rated value and is smaller than a predetermined cutout value, and the pitch-angle control device performs the pitch-angle driving control to set the pitch angle of the rotating blade to substantially 90 degrees when the value detected by the sensor is larger than the cutout value. 10. The water flow electricity generating device according to claim 1, further comprising a sensor that can detect a flow rate of the water flow or a parameter, the parameter increasing or decreasing with increasing or decreasing flow rate of the water flow when a pitch angle of the rotating blade is kept constant, wherein the air volume adjusting device decreases the air volume when the value detected by the sensor is larger than a predetermined cutout value larger than a rated value corresponding to the rated electricity generating capacity. 11. The water flow electricity generating device according claim 1, wherein the float unit includes: an air chamber; and a movable partition member that defines the air chamber, an outer surface of the movable partition member being in contact with the water, wherein the air volume adjusting device moves the movable partition member to change a volume of the air chamber.