JP2578304Y2 - Excessive teeter angle suppression device for teeter hub in wind turbine generator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teeter angle suppressing device for suppressing an excessively large teeter angle of a teeter hub when a wing moves in a teeter by wind pressure in a wind turbine having two blades.

[0002]

2. Description of the Related Art A wind power generator in which two blades are rotated to generate electric power has a nacelle 2 rotatably supported in a horizontal direction at an upper end of a tower 1 as shown in FIG. A tip of a rotating shaft 3 rotatably supported in the nacelle 2 is projected forward from the nacelle 2, and a pair of blades 4 a and 4 b are coaxially attached to the tip of the rotating shaft 3. The teeter hub 5 is integrally attached via a teeter pin 6 so that rotation power is transmitted to the rotary shaft 3 via the teeter hub 5 by rotation of the blades 4a and 4b. A speed device 7 and a generator 8 are connected to the rear end of the rotating shaft 3 so that the power transmitted to the rotating shaft 3 is increased by the speed increasing device 7 and transmitted to the generator 8 to generate power. It is.

[0003] The teeter pin 6 is attached to the rotating shaft 3.
It is fixed so as to extend in a direction perpendicular to the axis of the rotating shaft 3, and when the two blades 4 a, 4 b receive a strong wind pressure, the blade is located above the blade located below the tower 1. In this case, it is necessary to tilt the two blades 4a and 4b together with the teeter hub 5 in the front-rear direction to balance the strong wind pressure load. Is fixed in a direction orthogonal to the rotation shaft 3, the teeter hub 5 is rotatably supported by the teeter pin 6, and the blades 4 a and 4 b are tilted in the front-rear direction about the teeter pin 6, so-called teatering. It is.

Further, in order to change the pitch angle of the blades 4a, 4b, a pitch angle operation unit 10 having a cylinder 9 connected to the base of the blades 4a, 4b is attached to the tip of the rotary shaft 3.

In the case of the above-mentioned two-blade wind power generator, the two blades 4a and 4b rotate at high speed during operation and the rotation speed is high, so that they act on the tips of the rotating blades 4a and 4b. The centrifugal force to be applied is large, and the damping force due to aerodynamic force is increased, so that there is no large swing.

However, when the rotation speed of the two blades 4a and 4b is low and the rotation speed is low, such as when the wind power generator is started or stopped, the centrifugal force acting on the tips of the blades 4a and 4b. Low force, low aerodynamic damping, upper blade 4a
When the blade 4a is rotated downward in a state where the blade 4a is pushed downwind by the wind force, a large shaking occurs. When the blades 4a and 4b swing in the front-rear direction (the direction of the arrow a) perpendicular to the rotation direction due to the swing, the teater angle of the teater hub 5 around the teater pin 6 becomes excessive.

Conventionally, in order to prevent the above-mentioned teeter angle from becoming excessive, as shown in an example in FIG. 5, a disk-shaped supported object 11 attached to the tip of a rotating shaft 3 is fixed to a fixed supporting member 12. A bracket 14 mounted rotatably via a bearing 13 and mounted at several circumferential positions in a teeter hub 5 which is tilted about a teeter pin 6 with respect to the rotating shaft 3; A damper 16 by a spring or a hydraulic pressure is arranged between each of the brackets 15 and the bracket 15 attached at several places in the circumferential direction, and connected by a pin 17. When the blade 4a is inclined to the leeward side and the lower blade 4b is inclined to the leeward side, a compressive force is applied to the damper 16 located on the upper side, and the damper 16 located on the lower side is subjected to a compressive force. Tension is allowed to act, that so as to prevent the teeter angle is excessive has been proposed (real-Open No. 2-28841).

[0008]

However, in the teeter motion damping system using the conventional damper 16 shown in FIG. 5, the teeter hub 5 swings due to the teeter motion when the two blades 4a and 4b rotate at a low speed. The force may be applied to the damper 16 to damage the damper 16.

In view of the above, the present invention is directed to a device for suppressing an excessively large teeter angle of a teeter hub, which can improve the reliability over a long period of time without damaging the teeter angle, instead of using an excessively large teeter angle with a damper. It is something to offer.

[0010]

According to the present invention, in order to solve the above-mentioned problems, two blades are mounted on the same axis on a teater hub which is mounted on a rotary shaft via a teater pin so as to be tiltable in the front-rear direction. In a configuration in which when the two blades rotate, rotational power is transmitted to the rotating shaft via a teeter hub, a disk is attached to the teeter pin by projecting the head of the teeter pin outward from the side surface of the teeter hub. The casing surrounding the disc is attached to the side of the teeter hub to seal between the casing and the teeter pin and fill the casing with viscous fluid, and the casing rotates with the teeter hub relative to the disc in the viscous fluid. When this occurs, the viscous fluid becomes a resistance and suppresses the rotation of the casing, thereby preventing the teeter angle from becoming excessive. Unisuru.

[0011]

When the rotating speed of the blades is low at the time of starting and stopping the wind power generator, the centrifugal force due to the rotation of the blades is small and the aerodynamic damping is small. Begins to tilt around the teeter pin. At this time, although the casing rotates with respect to the disk, the rotation of the casing is suppressed by the resistance of the viscous fluid filled in the casing, and the teeter angle is prevented from becoming excessive.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. Similar to the conventional two-blade wind power generator shown in FIG. 4, two blades 4a and 4b are coaxially mounted on a teeter hub 5. Two teater pins fixed to the rotating shaft 3 at the tip of a rotating shaft 3 rotatably mounted so that the pitch angle can be changed and the teater hub 5 is rotatably supported in the nacelle 2. When the two blades 4a and 4b rotate, the rotational force is transmitted to the rotary shaft 3 via the teeter hub 5 and the teeter pin 6, and the blades 4a and 4b are subjected to wind pressure. In response, the upper blades move backward (leeward) and the lower blades move forward (windward)
In the configuration in which the tilting is absorbed by the rotation of the teeter hub 5 about the teeter pin 6,
Excessive rotation (teeter motion) of the teeter hub 5 about the teeter pins 6 on both sides of the rotating shaft 3 is suppressed without using a damper.

More specifically, the tip of the teeter pin 6 extending in the opposite direction is fixed to a shaft box 18 fixed to the side wall 5a of the teeter hub 5, a thrust bearing 19 and a radial bearing 2 are provided.
0 and freely rotatably penetrate through the
In the configuration in which the teeter hub 5 is configured to be rotatable about the teeter pin 6, the disk 21 is fixed to the head of the teeter pin 6, while the teeter pin 6 penetrates the center part outside the axle box 18. An inner casing 22 having a hole to be formed is integrally attached with a bolt 23, a sealing device 24 is interposed between a center hole of the inner casing 22 and the teeter pin 6, and is located outside the disk 21. An outer casing 25 for accommodating the disk 21 between the inner casing 22 and the inner casing 22;
And small gaps 26 and 27 are formed between the outer casing 25 and the disk 21 so that the viscous fluid 28
Fill between 2,25.

When the blades 4a, 4b are rotating at a low speed, such as when the wind power generator is started and stopped, the centrifugal force acting on the tip of the blades is low because the rotation speed of the blades 4a, 4b is low as described above. Is small and the aerodynamic damping is small, so that when the blades 4a and 4b receive a strong wind pressure, the upper blade receives a higher wind pressure than the lower blade. Since the upper blades are greatly inclined to the leeward side, the teeter hub 5 makes a teeter motion at an excessively large teeter angle around the teeter pin 6.

In this case, in the present invention, a disk 21 is attached to the heads of the two teeter pins 6, and the disks 21 are fixed to the teeter hub 5.
5 and the casings 22 and 25 are filled with the viscous fluid 28, the viscous fluid 28 entering the narrow spaces 26 and 27 between the disc 21 and the casings 22 and 25 is It acts as a resistance at the time of relative displacement between the discs 22 and 25 and the disc 21, and acts as a damper when the teater hub 5 rotates about the teater pin 6 and performs a teater movement together with the blades 4 a and 4 b, thereby suppressing the rotation of the teater hub 5. do. In this case, two disks 2
Due to the configuration in which the viscous fluid 28 covers the periphery of 1, the resistance to rotation of the teeter hub 5 is further increased, and the teeter angle of the teeter hub 5 can be prevented from becoming excessive.

The present invention is not limited to the above embodiment. For example, the viscous fluid 28 may be filled in the radial bearing 20 of the teeter hub 5 rotatably supported by the teeter pin 6, In this case, it is needless to say that the disk 21 on the head of the teeter pin 6 can be omitted, and that various changes can be made without departing from the scope of the present invention.

[0018]

As described above, according to the excessively large teeter angle of the teeter hub in the wind turbine generator of the present invention, the teeter hub is tiltably attached to the rotary shaft via the teeter pin, and the two blades are attached to the teeter hub. In a configuration in which the teeter hub and the blade are tilted about the teeter pin to make a teeter movement together with the blades, a disk is attached by projecting the tip of the teeter pin, and a casing is attached to the teeter hub so as to wrap the disk. Since the disk is covered with the viscous fluid filled in the casing to provide a resistance action when the teeter hub rotates around the teeter pin, the two-blade wind power generator is started or stopped. , When the blades rotate at a low speed and receive strong wind pressure, When trying to make a teetering movement, the rotation of the teeter hub centering on the teeter pin can be attenuated to prevent the teeter angle from becoming too large, and the shear type damping is performed using a viscous fluid. Therefore, it is possible to obtain an excellent effect that a very simple configuration can be achieved and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the device of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an enlarged sectional view of a part III in FIG. 2;

FIG. 4 is a schematic perspective view showing an example of a conventional two-blade wind power generator.

FIG. 5 is a cross-sectional view showing a configuration for attenuating rotation of a conventional teeter hub.

[Explanation of symbols]

 Reference Signs List 3 rotating shaft 4a, 4b blade 5 teater hub 6 teater pin 7 speed increasing device 8 generator 18 axle box 19 thrust bearing 20 radial bearing 21 disk 22 inner casing 25 outer casing 26, 27 space 28 viscous fluid

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F03D 1/02 F03D 7/04 F03D 9/00 F03D 11/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A teeter hub is attached to a tip end of a rotating shaft connected to a generator via a teeter pin extending in a direction orthogonal to the rotating shaft, and the teeter hub is supported so as to be rotatable around the teeter pin; Attaching the two blades on the same axis to the teeter hub, attaching a disk to the head of the teeter pin in a wind turbine generator in which the rotating shaft rotates through the teeter hub to drive the generator with the rotation of the blades, A casing for accommodating the disc is attached to the teeter hub, and the casing is filled with a viscous fluid so as to cover the disc with the viscous fluid. apparatus.