JPH01273880A - wind power generator - Google Patents

Abstract

PURPOSE:To balance a wind pressure load applied to a blade, without moving the blade obliquely by jointing a rotatedly-moving crank element formed on the base of the blade to a blade pitch rod by means of a free arm which is pivotally supported at its center. CONSTITUTION:By receiving a wind pressure on a blade 9, a blade mounting hub 8 is rotated integrally with a main shaft 3, whose rotation drives a generator 5. To keep the running speed of the generator 5 constant, a blade pitch control rod 14 is slide-controlled by a pitch angle control part installed in a nacelle 2. Integrated with this control rod 14, a free arm 20 is moved to convert its moving distance into a rotating angle of the blade via a crank part 11 of each blade 9 for controlling both blades in the same pitch angles.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wind power generation device with an improved structure for balancing wind pressure loads applied to a pair of blades.

[Prior Art] Generally, a wind power generation device is provided with a nacelle C which does not house a generator at the upper end of a tower a and is rotatable horizontally, as shown in FIG. The main shaft d is rotatably connected to the main shaft d, and a pair of blades f are attached to the main shaft d via a blade attachment hub e.

By the way, wind pressures of different magnitudes act on both blades f due to the influence of wind shear, and in such a case, there is a problem in that a bending moment is generated in the main axis d. In order to solve this problem, for example, by attaching the blade (=f hub e) tiltably to the main shaft d using a tee tubing g, and by tilting the blade f from the wind pressure difference, for example from A to the mouth, both blades f We tried to balance the applied wind pressure load.

[The problem that the invention attempts to solve! ! ! ] However, in the above-mentioned wind power generation device, there is a concern that the nacelle C may be moved by tffl because the blade rotates while making a scene movement about the tee tubing g as a fulcrum.

An object of the present invention is to solve these problems and provide a wind power generation device that can balance the wind pressure load applied to the blades without tilting the blades, and has less vibration and output fluctuation.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a wind power generation device in which a main shaft connected to the generator is rotatably provided at one end of a nacelle housing the generator. A blade mounting hub is fixed, and a variable pitch blade is rotatably mounted outside the blade mounting hub on the circumferentially opposing part, and the blade mounting 1 [slides through the shaft hole formed in the main shaft from the nacelle side into the inside of the hub]. A movably extended blade pitch operating rod is spanned over the blade, and a rotating crank portion formed at the base of the blade is connected to each other by a free arm whose center is pivotally supported by the operating rod.

[Effect 1: By receiving wind pressure on the blade, the blade jf! 2
The attached hub rotates together with the main shaft, and the rotation of the main shaft drives the generator.

In order to keep the rotational speed of the generator constant, a blade pitch control rod is slid by a pitch angle control section provided in the nacelle. The free arm moves together with this operating rod, and the amount of movement is converted into a rotation angle of the blade via the crank portion of each blade, so that both blades are operated to the same pitch angle.

On the other hand, when both blades are subjected to different magnitudes of wind pressure, the magnitude of the moment generated at the crank part of each blade differs depending on the wind pressure, and each moment is applied to both ends of the free arm, which is a lever, so the difference in these moments The crank part of each blade is pushed and moved, changing the pitch angle of the blade. The pitch angle of the blade that receives greater wind pressure is changed to reduce wind pressure resistance, and the pitch angle of the blade that receives smaller wind pressure is changed to larger wind pressure resistance, which increases the magnitude of the moment generated in the crank section of each blade. Balance occurs when they are equal.

In this way, the wind pressure load applied to both blades is balanced, so there is no moment on the main shaft that tries to bend it.Since such a balance mechanism is provided inside the blade mounting hub, the blade mounting hub can be easily Unlike conventional wind power generators that can be fixed to the main shaft and thus balance the wind pressure load by tilting the blade mounting hub, the swinging of the nacelle can be reduced without blade movement.

[Example] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a nacelle 2, which is the main casing of the wind power generator, is horizontally and rotatably supported at the upper end of a tower 1 that stands vertically. A main shaft 3 is rotatably mounted via a bearing 4. Further, a generator 5 is housed within the nacelle 2, and the generator 5 is connected to one end of the main shaft 3 via a speed increasing device 6.

As shown in FIGS. 1 to 3, a box-shaped blade attachment hub 8 is fixed to the other end of the main shaft 3.
A base portion of a variable pitch blade 9 is rotatably attached to a portion facing the outer periphery of the blade via a blade bearing 10 so that the pitch angle can be varied.

A crankshaft 11 is protruded from the other end of the blade bearing 10 at a position (crank part) shifted from the center, and the crankshaft 11 is connected to the blade mounting hub 8 as shown by the solid line in FIG.
When moved forward along the axial direction, the blade 9 becomes parallel to the wind direction, and when moved backward as shown by the imaginary line, the pitch angle changes so that the blade 9 becomes perpendicular to the wind direction.

On the other hand, a shaft hole 12 is formed in the shaft center of the main shaft 3, and the shaft hole 12 is formed in the front u8a of the blade mounting hub 8.
A shaft hole 13 is formed opposite to the shaft hole 13, and a blade pitch control rod 14 is spanned inside the blade mounting hub 8 with its both ends slidably inserted into the shaft holes 12 and 13.

15 is a sliding bearing provided on the inner peripheral surface of the shaft hole 12.13.

The proximal end of the operating rod 14 is connected via a swivel joint 17 to the tip of a piston rod of a cylinder 16, which is a pitch angle operating section disposed within the nacelle 2. In front of the blade mounting/S block 8, a cylindrical cup (-18) with a bottom is provided by 1 inch to cover the tip 14a of the operating port/end 14 extending from the shaft hole 13. .

The center portion of the free arm 20 is pivotally supported on the operating rod 14 in the blade mounting hub 8 via one shaft extending perpendicularly thereto.

In order to install this free arm 20,
A boss portion 21 having a rectangular cross section is formed in a part of the operating rod 4 , and a shaft hole 2 perpendicular to the axial direction of the operating rod 14 is formed in this boss portion 21 .
2 is formed. Further, an opening 23 is formed in the center of the free arm 20 and is fitted onto the boss 21 so as to be able to rotate at a predetermined angle θ about the shaft 19. A bolt as the shaft 19 is inserted across the shaft hole 22, and a nut 24 is inserted into the bolt.
is tightened. A bushing 25 is fitted into the shaft hole 22 and serves as a sliding bearing.

As shown in FIG. 3, the free arm 20 is arranged obliquely to the line connecting both blades 9 when viewed from the front, and each end is connected to the crankshaft 11 of each blade 9 via a connecting rod 26 consisting of a turnbuckle. are connected to each other. Both ends of the connecting rod 26 are rotatably attached to a shaft 27 protruding from each end of the free arm 20 and to each crankshaft 11.

Further, in order to slidably support the free arm 20 within the blade mounting hub 8, a support frame 2 is provided between the front and rear walls of the blade mounting hub 8, which has a slide eraser 28 that slidably supports both ends of the free arm 20. The slide plays 1 and 30 are attached to the sliding contact portion of the free arm 20 with the slide eraser 28.

Next, the operation of the above embodiment will be described.

The blade attachment hub 8 is forced to face upwind by a yaw rotation device 31 provided between the tower 1 and the nacelle 2, and by receiving wind pressure on the blade 9,
A blade attachment hub 8 rotates together with the main shaft 3. The rotational force is transmitted from the main shaft 3 to the generator 5 via the speed increasing device 6, and drives the generator 5. In order to keep the power generation output of the generator 5 constant, the pitch angle of the blades 9 is controlled via the cylinder 16 of the pitch angle control section.

When the wind speed increases and the rotational speed increases, the operating rod 1
4 is moved forward, and when the wind speed decreases and the number of rotations decreases, the operating rod 14 is moved backward. When the operating rod 14 moves forward, the crankshaft 11 of each blade 9 is pulled forward via the free arm 20, reducing the pinch angle of the blade 9 relative to the wind direction, and conversely, when the operating rod 14 moves backward, the pitch of the blade 9 decreases. The angle becomes larger. As a result, the wind pressure resistance of the blades 9 is adjusted, and the power generation output is kept constant.

On the other hand, due to the influence of wind shear (vertical wind speed distribution), the wind pressure load received by one blade in the upper position is different from that received by one blade in the lower position.

In such a case, a moment proportional to the wind pressure is generated on the crankshaft 11 of each blade 9, and each moment is applied to the free arm 2 whose central portion is pivotally supported by the operating rod 14.
The free arm 20 tilts about the shaft 19 due to the difference in moment acting on both ends of the free arm 20 . In this case, the blade 9 that receives the larger wind pressure is rotated by the wind pressure in a direction where the pitch angle becomes smaller, so this blade 9ffl! One end of the free arm 20 of I is tilted forward (to the windward side) about the shaft 19 as a fulcrum.

The bent end of the free arm 20 is rearward (upper side of the claw) using the lever principle.
Since the blade 9 is tilted to the side that receives less wind pressure,
is rotated in the direction that increases the pitch angle.

As a result, the wind pressure load on the blade 9, which was receiving large wind pressure, decreases, and the wind pressure load on the blade 9, which was receiving small wind pressure, increases, so that the free arm 20 reduces the moment generated on both crankshafts 11. When they become equal, it becomes balanced. As a result, the wind pressure load acting on both blades is balanced, and the main shaft 3
There is no moment that tries to bend it.

Since a mechanism is provided in the blade mounting hub 8 to balance the wind pressure loads of both blades, the blade mounting hub 8 can be fixed to the main shaft 3, and therefore the blade mounting hub can be tilted relative to the main shaft to reduce the wind pressure. Unlike conventional wind power generators that balance the load, blades 9
It is possible to create a wind power generation device with little output fluctuation without any seesaw movement.

In the embodiment, a crankshaft 11 is provided protruding from the base end of the blade bearing 1o, and a connecting rod 2 is connected to the crankshaft 11.
6 are connected, however, the connecting rod 26 may be directly connected to the crank portion without providing the crankshaft 11.

[Effects of the Invention] In summary, the present invention provides the following effects.

(1) The lever principle of the free arm attached to the blade pitch control rod inside the blade mounting hub is used to balance the moment caused by the wind pressure load applied to the blade, so the blade mounting hub is fixed to the main shaft. The wind pressure load can be balanced in this state.

(2) Therefore, unlike conventional wind power generation equipment, which balances the wind pressure load by tilting the blade mounting hub with respect to the main shaft, the blades do not make any movement, so there is less swinging of the nacelle. The service life of the product can be increased.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of a wind power generation device according to the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. The cross-sectional view and FIG. 4 are perspective views showing a conventional wind power generation device. In the figure, 2 is a nacelle, 3 is a main shaft, 5 is a power generator, 8 is a blade mounting hub, 9 is a blade, 11- is a crankshaft of the crank part, 12 is a shaft hole, 14 is a blade pitch angle control rod, 20 is a It is a free arm. Patent Applicant Ishikawajima #1 Maju Kogyo Co., Ltd. Representative Patent Attorney Nobuo Kinuya Figure 2

Claims (1)

[Claims] 1. In a wind power generation device in which a main shaft connected to the generator is rotatably provided at one end of the nacelle housing the generator, a blade mounting hub is fixed to the main shaft, and a variable pitch is attached to the outer circumferential opposing part of the blade mounting hub. The blade is rotatably mounted, and a blade pitch control rod is slidably extended from the nacelle side through a shaft hole formed in the main shaft inside the blade mounting hub, and a blade pitch control rod is formed at the base of the blade. A wind power generation device characterized in that rotating crank parts are connected to each other by a free arm whose center is pivotally supported by the operating rod.