JPH0816474B2 - Tailing structure of propeller type wind turbine - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a teatering structure for a propeller-type wind turbine.

[Prior art]

A propeller-type wind turbine is used as a power source for a wind power generator, etc., but this propeller-type wind turbine is generally configured by attaching a rotor to the end of a cantilever-supported rotor shaft. The structure is such that the blades are attached radially.

When such a rotor is attached to the rotor shaft, there is a rotor which is attached to the shaft attached so as to be orthogonal to the rotor shaft so that the rotor is moved back and forth in a seesaw motion. By attaching to such a teetering structure, the blade bending load and rotor shaft bending load resulting from the imbalance between the wind force received by the blade on the lower side (ground side) and the wind force received on the upper side (above) of the rotor shaft. Can be made smaller.

However, the conventional propeller-type wind turbine teatering structure has a rotor shaft tip formed in a bifurcated shape, and the bifurcated tip extends across the outside of the rotor hub and extends to the opposite side. It had a structure in which it was rotatably supported by a theta ring shaft fixed to. As described above, the structure is such that the tip end of the rotor shaft straddles the opposite side of the rotor hub. Therefore, the structure of the peripheral portion including the rotor hub becomes large and it is difficult to make it compact.

Further, when a double shaft structure having a quill shaft for absorbing excess torque is used as the rotor shaft, there is an advantage that the shock absorbing power can be increased as the bending shaft is lengthened. . However, in the case where the tip of the rotor shaft is bifurcated so as to straddle the outside of the hub as described above, the bending shaft cannot be lengthened beyond the hub, and therefore the shock absorbing power is correspondingly increased. It had the disadvantage of becoming smaller.

[Object of the Invention]

An object of the present invention is to make a teat ring structure of a propeller-type wind turbine compact, and when a dual structure rotor shaft having a flexible shaft is used, the shock absorbing force of the flexible shaft is reduced to the conventional structure. It is to provide a teaching ring structure that can be made larger.

[Structure of Invention]

The present invention to achieve the above object, a rotor configured by providing a plurality of blades on the hub, is attached to one end of the rotor shaft in the lateral direction, in a propeller-type wind turbine in which the other end of this rotor shaft is cantilevered, A teata rig shaft is fixed to the tip of the rotor shaft so as to be orthogonal to the rotor shaft, and is inserted inside the hub, and is rotatably supported at both ends of the tee ring shaft via bearings that are fixed to the inner surface of the hub. The outer surface of the hub, which faces the side surface of the teatering shaft along the axis of the teatering shaft, is formed on a surface substantially along the axis of the rotor shaft, and a bearing fixed to the outer surface is formed. While rotatably supporting the base end portion of the blade on the outer surface of the hub via, a hollow portion is formed inside the base end portion, and the pitch angle of the blade is formed on the hub outer surface side of the hollow portion. Drive to change It is characterized in that it has disposed over data.

〔Example〕

FIG. 3 shows the entire propeller-type wind turbine having the teatering structure of the present invention. Reference numeral 1 is a column, and a rotor 3 is attached to an upper end of the column via a gear case 2. The gear case 2 is rotatably supported around the axis of the column 1, and a gear shaft 2 is cantilever-supported with a rotor shaft 9 described later, and the rotor 3 is attached to the end of the rotor shaft 9. . The rotor 3 is composed of a hub 4 and two blades 5 and 5 arranged opposite to each other. The outsides of the gear case 2 and the hub 4 are covered with cowlings 7 and 8, respectively.

1 and 2 show the details of the rotor support with the cowlings 7 and 8 removed.

The rotor shaft 9 has a double structure in which the inside of the flexible shaft 15 is internally mounted, and the outer side thereof is rotatably supported by the gear case 2 via bearings 10 and 10. At the same time, the inner flexible shaft 15 also has bearings 16 and 16.
It is rotatably supported by the gear case 2 via. Due to such a double structure, the rotor shaft 9 of the main body supports the bending load, while the inner flexible shaft 15 transmits the torque. In addition, the bending shaft 15 is designed to absorb the excessive torque when the torque is generated. The bending shaft 15 transmits the rotation of the rotor shaft 9 to a vertical transmission shaft 18 via a speed increasing gear group 17.

At the tip of the rotor shaft 9, a teater ring shaft 11 is fixed so as to be orthogonal to each other. Further, the both ends of the teetering shaft 11 have hubs 4 formed in a truncated pyramid shape,
The bearings 12 and 12 fixed to the inner surfaces of the left and right sides are rotatably supported. This teatering shaft 11
Is attached so that its axis T forms a δ ₃ angle with respect to the direction orthogonal to the extending direction of the blades 5, 5. By such mounting, the rotor 3 can be attached to the teaching ring shaft.
Titaling around the axis T of 11 (seesaw movement)
I can do it.

The outer surfaces of the hub 4 that are opposed to each other with the side surfaces along the axis of the teater ring shaft 11 interposed therebetween are formed substantially along the axis of the rotor shaft 9, and ring-shaped bearings 13 and 13 are formed on the outer surfaces thereof. Is fixed, and the ring-shaped internal gears 14, 14 are rotatably fitted to the ring-shaped bearings 13, 13, and the base ends of the blades 5, 5 are respectively attached to the ring-shaped internal gears 14, 14. It is fixed. With such a mounting structure, the blade
5, 5 extend in opposite radial directions and form a coning angle α.

Further, on the outer surface of the hub 4 surrounded by the ring-shaped bearings 13, 13, the stays 19, 19 are fixed by projecting into the hollow portion formed inside the base end portions of the blades 5, 5. , 19
Servo motors (driving motors) 20 and 20 for changing the pitch angles of the blades 5 and 5 are respectively attached to the hub outer surface side. This servo motor 20,2
0 is configured to drive the ring-shaped internal gears 14 and 14 via the pinions 21 and 21 according to a command from a control unit (not shown), thereby rotating the blades 5 and 5.

In the propeller-type wind turbine described above, the roller 3 is rotated by the wind in the arrow W direction, and the rotor shaft 9 is rotated about the axis R. Further, the blades 5, 5 form a coning angle α, so that the rotor 3 has an action of aligning in the wind direction, and performs a yaw motion around the support column 1. Also,
The rotor 3 makes a seesaw motion about the axis T of the teatering shaft 11, whereby the blades 5 and 5 receive wind force when they are received on the lower side (ground side) and when they are received on the upper side (air side). The bending load due to the imbalance with the wind force is reduced. Further, the blade 5 is rotated left and right around the axis P by the servo motor 20 to change the pitch angle according to the wind speed.

In the above-mentioned propeller-type wind turbine teatering structure,
Since the tip end of the rotor shaft 9 is inserted inside the hub 4, and both ends of the teetering shaft 11 support the bearings 12, 12 fixed to the inner surface of the hub 4 inside thereof. The external structure does not expand unlike the conventional case, and the overall size can be reduced.

In addition, the outer surface of the hub 4 that faces the side surface of the teater ring shaft 11 along the axis line of the teater ring shaft 11 is formed to be a surface substantially along the axis line of the rotor shaft 9, and the bearing 13 is formed on the outer surface thereof. In order to rotatably support the base end portions of the blades 5, 5 on the hub 4 via the blades 13, 13, the blades 5, 5 may be mounted in a position near the rotor shaft as close to the rotor shaft 9 as possible. Even if a large blade having a thicker base end is attached, the outer surface of the hub 4 to which the base end is attached can be extended substantially along the axis of the rotor shaft 9. The hub 4 does not become large in the radial direction of the rotor shaft.

Further, since the inside of the base end portion of the blades 5, 5 is hollow, the blades 5, 5 can be made lighter, and further, the servo for changing the pitch angle of the blades 5, 5 in the hollow portion. Since the motors 20 and 20 are provided, it is possible to effectively use the empty space.

In addition, since the servomotors 20, 20 are arranged near the rotor shaft 9 so that they are on the outer surface side of the hub of the hollow portion, even if the rotor shaft 9 rotates at high speed, a large centrifugal force is generated. , 20 does not work.

In addition, the teatering shaft is perpendicular to the tip of the rotor shaft 9.
The rotor shaft 9 is not unnecessarily long because the rotor shaft 9 is provided and the teater ring shaft 11 is inserted into the hub.

Further, the blades 5, 5 are rotatably supported by the hub 4 via bearings 13, 13 fixed to the outside of the hub 4, and servo motors 20, 20 for changing the pitch angle are provided in the hollow portion at the base end thereof. Since the blades 5 and 5 are arranged, the blades 5 and 5 can be firmly fixed to the hub 4 with a simple structure, and the structure for changing the pitch angle of the blades 5 and 5 can be simplified.

Further, since the rotor shaft 9 is inserted to the inside of the hub 4, the bending shaft 15 becomes longer by the amount of the insertion, and the shock absorbing force can be increased.

[Advantages of the Invention] As described above, according to the present invention, the bearing portion fixed to the tip of the rotor shaft so as to be orthogonal to the rotor shaft is inserted inside the hub, and is fixed to the inner surface of the hub. Since the structure is rotatably supported at both ends of the ring shaft, the structure around the hub can be made compact as a whole.

Further, the outer surface of the hub, which faces the side surface of the teatering shaft along the axis of the teatering shaft, is formed on a surface substantially along the axis of the rotor shaft, and the base of the blade is mounted on the outer surface via a bearing. Since the end part is rotatably supported on the outer surface of the hub, the blade can be attached to the rotor shaft side as much as possible to suppress the centrifugal force acting on the blade, and the base part is thick and large. Even when a blade is attached, it is sufficient to extend the outer surface of the hub, to which the base end of the hub is attached, approximately along the axis of the rotor shaft. The increase in force can be avoided.

Further, since the hollow portion is formed inside the blade base end portion, it is possible to reduce the weight of the blade, and since the drive motor for changing the pitch angle of the blade is arranged in the hollow portion, an empty space is provided. Can be effectively used.

Moreover, since the drive motor that changes the pitch angle of the blades is arranged on the rotor shaft side so that it is on the hub outer surface side of the hollow part, even if the rotor shaft rotates at high speed, a large centrifugal force is applied to the drive motor. Does not work.

In addition, by providing a teat ring shaft orthogonal to the tip of the rotor shaft and inserting this teat ring shaft into the hub, the rotor shaft does not become unnecessarily long.

Also, the blade is rotatably supported on the hub via a bearing fixed to the outer surface of the hub, and a drive motor for changing the pitch angle of the blade is arranged in the hollow portion at the base end of the hub. The blade can be firmly fixed to the hub, and the structure for changing the pitch angle of the blade can be simplified.

Further, when the rotor shaft has a double structure in which a flexible shaft is incorporated, the flexible shaft can be made longer than the conventional structure by the amount of the flexible shaft being inserted into the hub, so that the shock absorbing power can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a rotor support portion of a propeller-type wind turbine according to an embodiment of the present invention by partially breaking it, FIG. 2 is a vertical sectional view of the rotor support portion, and FIG. 3 is a perspective view of the propeller-type wind turbine. It is a figure. 1 ... Prop, 2 ... Gear case, 3 ... Rotor, 4 ...
Hub, 5 ... Blade, 9 ... Rotor shaft, 11 ... Titer ring shaft, 12 ... Bearing, 13 ... Bearing, 15 ... Flexible shaft,
20 ... Servo motor (drive motor).

Claims (2)

[Claims] 1. A propeller-type wind turbine in which a rotor having a hub provided with a plurality of blades is attached to one end of a lateral rotor shaft, and the other end of the rotor shaft is cantilevered and supported.
The teater ring shaft is fixed to the tip of the rotor shaft so as to be orthogonal to the rotor shaft, and is inserted inside the hub, and is rotatable at both ends of the teater ring shaft through bearing portions fixed to the inner surface of the hub. The outer surface of the hub, which is opposed to and sandwiches the side surface of the teatering shaft along the axis of the teatering shaft, is formed on a surface substantially along the axis of the rotor shaft and is fixed to the outer surface. The base end portion of the blade is rotatably supported on the outer surface of the hub via a bearing, and a hollow portion is formed inside the base end portion, and the pitch of the blade is formed on the hub outer surface side of the hollow portion. A teatering structure for a propeller-type wind turbine, characterized in that a drive motor for changing an angle is provided. 2. A teater ring structure for a propeller-type wind turbine according to claim 1, wherein the rotor shaft has a double structure in which a flexible shaft is incorporated.