JPH04237876A - Wind-resisting device for windmill - Google Patents

Abstract

PURPOSE:To improve the wind-resisting strength in a windmill inexpensively in a short time at the time of storm arising by constituting a wind-resisting device from wire fittings being attracted to each tip of respective blades, plural pieces of binding wires coupling an interval between tips of adjacent blades, and wire clampers attached to each of these binding wires. CONSTITUTION:When a storm is predicted, a windmill is made into a feathering state, a binding wire 5 is attached to each tip of blades 2, 3, 4 in space between tips of adjacent blades via a wire fitting 7, operating each wire clampers 6, and thereby tension is given to each wire. Subsequently, one of the plural blades is set to horizontality and the windmill is stopped in advance. Thus installation of a wind-resisting device is over. This work can be done by an ordinary elevated service car 9, not a large-sized crane as in the past. Therefore even if a wind is blown from any direction at time of storm arising, these blades are reinforced with one another, and any possible deformation is checked, thus the wind-resisting strength is improved as a whole.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windproof device used as a countermeasure against strong winds for wind turbines used in power generating equipment and the like.

0002

[Prior Art] A typical windmill has a rotating part that rotates around a nearly horizontal axis held at the top of a windmill tower.
It has multiple independently cantilevered wings. Therefore, each blade has a low wind resistance strength during a storm, so when a storm is expected, each blade is removed one by one from the central rotating part.

FIG. 5 shows a conventional process for removing wind turbine blades. In the figure, reference numeral 1 indicates blades of wind turbine towers 2 to 4, and 10 indicates a large crane used for blade removal work.

0004

[Problem to be Solved by the Invention] Conventionally, when a storm was predicted, the work to remove the blades one by one was carried out several days before the storm. A large crane was always required to remove a single wing, and it took time to remove the wing fixing bolts, and preparations had to be made several days before the storm worsened, which was extremely time-consuming and costly. Furthermore, in wind power generation facilities equipped with a group of several to several hundred wind turbines, the removal of the blades is not only costly but also time-limited, making it virtually impossible.

The present invention solves the drawbacks of the prior art and aims to increase the wind resistance of a wind turbine in a short period of time and at low cost using a simple device without having to remove the blades of the wind turbine when a storm arrives. be.

[0006]

[Means for Solving the Problems] The present invention has solved the above-mentioned problems, and includes a plurality of wind turbines that are independently cantilevered on a rotating part having a substantially horizontal axis of rotation held at the top of a wind turbine tower. In a wind-resistant device applied to a wind turbine having several blades, a wire mounting bracket is attached to the tip of each of the blades, and a plurality of lashing wires are connected between the tips of adjacent blades via the wire mounting bracket. , and a wire fastener attached to each of the above-mentioned lashing wires.

[0007]

[Operation] The wind-resistant device of the present invention puts the wind turbine in a feathering state before a storm arrives, connects the tip of each blade with a lashing wire via a wire mounting bracket, and tightens the wire attached to the wire. By applying tension to each wire using a tool, each blade is reinforced with each other via the lashing wire during a storm, suppressing the deflection of the blade due to wind force, and the wind turbine as a whole is able to withstand wind blowing from various directions. The wind resistance is improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of an embodiment of the present invention. In the figure, 1 is a wind turbine tower, 2 to 4 are blades, 5 is a lashing wire that connects the tips of adjacent blades, 6 is a wire fastener attached to the wire, and 7 is a lashing wire that connects the ends of the wire. A wire attachment fitting 9 is attached to the tip of each wing, and 9 is an aerial work vehicle used for attaching and tightening the wires.

FIG. 2 is an enlarged perspective view of the X section in FIG. This figure shows details of the wire attachment fitting 7 for attaching the end of the wire 5 to the tip of the wing. This mounting bracket is mounted so as to cover the tip of the wing 3. The same applies to wings 2 and 4. The windproof device of the wind turbine is constituted by items numbered 5 to 7. The structure and function of the wind turbine parts (numbers 1 to 4) are the same as the conventional ones.

In a wind turbine equipped with the above-mentioned wind resistance device, when a storm is predicted, the wind turbine is put into a feathering state, and a lashing wire is connected between the tips of adjacent blades via a wire attachment fitting at the tip of each blade. Install in sequence and operate the wire clamps to apply tension to each wire. After that, one of the blades is set horizontally and the windmill is stopped. With the above steps, installation of the windproof device is completed. This work can be carried out using a regular aerial work vehicle rather than a conventional large crane. Next, we will discuss the effect of this device on stormy winds that constantly change direction.

(1) Action against wind blowing from the front or from the opposite front: In both of these cases, the angle of attack is zero, so no great force is applied to the blades, so each blade has sufficient wind resistance. It is.

(2) Effect on the wind blowing from the right: FIG. 3 is an explanatory diagram of the effect on the wind blowing from the right. In the figure, the solid lines are the blades and wires when there is no wind, the chain lines are the blades and wires displaced by the wind, T1, T2, and T3 are the wire tensions when there is no wind, and T1', T2', and T3' are the wires when there is wind. The tension is . When the wind blows from the right side, wings 2 and 3
The tension in the lashing wire between increases from T1 to T1';
Suppresses the deflection of the wings 2 and 3. Wing 1 does not receive large wind forces.

(3) Effect on the wind blowing from the left: FIG. 4 is an explanatory diagram of the effect on the left wind. Solid line in the figure,
The dashed line and tension display are the same as for the right wind. When the wind blows from the left side, the tension in the wire between the wings 4,2 and 4,3 is from T3 to T3' and from T2 to T2'
, respectively, thereby suppressing the deflection of the wings 2 and 3. wings 4
is not subject to large wind forces.

[0014] As described above, the wind turbine equipped with this device has the following features:
No matter which direction the wind blows from during a storm, the blades reinforce each other and prevent deformation, improving the wind turbine's overall wind resistance. Therefore, storm countermeasures can be implemented in a short time with a simple device and at low cost.

[0015]

[Effects of the Invention] The wind turbine windproofing device of the present invention includes a wire attachment fitting attached to the tip of each blade, a plurality of lashing wires connecting the tips of adjacent blades via the wire attachment fitting, and a wire fastener attached to each of the above lashing wires, so that when a storm arrives, wire tension is applied between the tips of each adjacent wing to mutually reinforce the wings, making it easy to use. The device can increase the wind resistance of the entire wind turbine in a short time and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of section X in FIG. 1;

FIG. 3 is an explanatory diagram of the effect of the above embodiment on right wind.

FIG. 4 is an explanatory diagram of the effect of the above embodiment on left wind.

FIG. 5 is an explanatory diagram of a conventional wind turbine blade removal operation.

[Explanation of symbols]

1 Windmill tower 2, 3, 4
wings

Claims (1)

[Claims] 1. A windproofing device applied to a wind turbine comprising a plurality of blades independently cantilevered to a rotating part having a substantially horizontal rotation axis held at the top of a wind turbine tower, each of the blades being wire fittings attached to the tips of the blades, a plurality of lashing wires connecting the tips of adjacent wings via the wire fittings, and wire fasteners attached to each of the lashing wires. A wind turbine windproof device characterized by: