JPS59147879A - Down wind type wind force generator - Google Patents

Abstract

PURPOSE:To prevent breakdown of blade fixing section while to prevent noise by fixing a blade having streamlined circumferential side rotatably at the portion of support facing with the blade of wind force turbine. CONSTITUTION:A blade 10 having streamlined circumferential side is fixed rotatably through ball bearings 11 at upper and lower ends to the portion of support 1 facing with the blade 3a of wind force turbine 3. Consequently the blade 10 will rotate such that the pointed end (P) will always direct downstream thereby wind blowing to collide against the support 1 as shown by arrow W2 will flow smoothly along the blade 10 to prevent production of eddy and dropping of wind speed at the downstream of support 1, resulting in prevention of breakdown of fixing section due to rolling of blade 3a and production of noise due to vibration of blade 3a.

Description

[Detailed description of the invention] The present invention relates to a downwind wind power generation device.

As the energy situation has changed in recent years and environmental pollution problems have become more serious, there has been a call for the use of clean and renewable natural energy.

Therefore, development of wind power generators that generate electricity using wind energy, which is a natural energy source, is underway. expected to be suitable.

The outline of a wind power generation device is explained with reference to Fig. 1. 2. A nacelle 2 is rotatably attached to one end of a column 1 erected on the ground, and a wind turbine 3 provided at one end is rotated by wind power. , the rotation is increased by a speed increaser 4 provided in the nacelle 2 to drive a generator 5.

In order to maintain the output constant even if the wind speed changes significantly, the variable pitch device 6 is used to control the two wind turbines.
The pitch (degree of inclination with respect to the wind direction) of the blades 3a is controlled.

Note that the wind speed is cut-in wind speed (e.g. 5 m/se
e) or below or cut-out wind speed (e.g. 17m
/5ee) or above and during maintenance and inspection, an inching and braking device 7 is provided to keep the wind turbine 3 locked with its blades in a horizontal state.

In addition, a yaw device 8 is provided between the nacelle 2 and the support column 1 in order to perform yaw control that changes the direction of the wind turbine B by rotating the nacelle 2 as indicated by the arrow in response to changes in the wind direction. ing.

The hydraulic device 9 is provided as a driving source for controlling each of these parts.

There are two types of such wind power generators: an upwind type in which the wind turbine 3 is rotated on the upwind side of the support 1, and a downwind type in which the wind turbine 6 is rotated in the leeward side of the support 1.

The present invention is directed to a downwind type wind power generator, an example of which is shown in FIGS. 2 and 3.

The advantage of such a downwind type is that yaw control is easy; in principle, the nacelle 2 can be attached to the support column 1 so that it can rotate freely, without the need for yaw control (free yaw). Since it should automatically rotate to the optimal position, the yaw device 8 only needs to be used auxiliary.

However, this downwind type has the disadvantage that the blades of the wind turbine have poor durability and are likely to generate noise.

In other words, in the case of a downwind type, the arrow Wt in FIG.
, the wind from the direction indicated by W2 is transmitted from behind by the blade 3a.
To rotate the wind Katabi:, /3, arrow W
The wind indicated by 2 hits the pillar 1, generates a vortex on the downstream side, and the wind speed decreases.

Therefore, when one blade 3a passes a position facing the support column 1, it receives a force in the direction of arrow A, and the blade on the opposite side receives a force in the direction of arrow B. The diameter of this wind turbine is rated output], and even a 00kW one is approximately 30m, 110m.
For the 00k one, it is 6Qm, so at this time, the shaft part 3
The bending moment applied to the attachment portion 3c of the blade 3a to the blade 3a becomes considerably large, and there is a problem that the attachment portion 3c may be cranked and damaged if used for a long period of time.

Further, when the blade 3a passes the position facing the support column 1, vibrations in the torsional direction as shown by arrow C in FIG. 3 are caused due to the vortices of the air current and uneven wind speed, which generates noise.

This invention aims to solve these problems in downwind wind power generators.

Therefore, the present invention has been developed by rotatably attaching a vane plate having a streamlined circumferential surface to the part of the support column facing the blades of the wind turbine in a downwind type wind power generator, thereby reducing the vortex on the downstream side of the support column. This prevents noise generation and reduction in wind speed, thereby reducing fatigue at the blade attachment part of the wind turbine, and also prevents noise generation.

Hereinafter, the present invention will be described in detail with reference to FIG. 4 and subsequent figures of the accompanying drawings.

4 to 6 show a first embodiment of the present invention, parts corresponding to those in FIGS. 1 to 3 are denoted by the same reference numerals, and a description thereof will be omitted.

In this embodiment, the blade 3a of the wind turbine B of the pillar 1 is
Excluding the part near the center of rotation of the part facing the blade, a vane plate 10 whose circumferential side surface 10a has a streamlined shape as shown in FIG. It is mounted rotatably around the support column 1 via bearings 11°11.

In this way, the blade 1o always follows the wind direction with the tip P
is rotated so that it faces downwind, and arrow W is shown in Figures 5 and 6.
As shown in 2, the wind blowing against the support 1 flows smoothly along the circumferential surface 10a of the blade 1o as shown in the streamlines in FIG. The flow velocity behind the flow does not decrease much either.

Therefore, as mentioned above, the blades 3 of the wind turbine 6
The force that causes the shaft part 3b to swing relative to the shaft part 3b is reduced, and almost no unreasonable bending force is applied to the mounting part 3c, so that durability is greatly improved.

Furthermore, the generation of noise due to vibrations in the torsional direction of the five blades 3a is also significantly suppressed.

The blade plate 10 may be provided over the entire area of the support 1 facing the blade 3a, but the bending moment applied to the attachment portion 3c increases in proportion to the distance from the rotation center of the wind turbine 3. It can be omitted in the part near the center of rotation because it is less affected by vortices and uneven flow velocity.

Therefore, the blade plate 10 is placed at least in a portion corresponding to a position of 70% to 110% of the radius from the rotation center of the wind turbine B.
If there is, you can get sufficient effect.

FIG. 7 shows a second embodiment of the invention, in which the vane plate 10 is
The structure is substantially the same as that of the previous embodiment except that it is physically fixed to the lower part of the nacelle 2 by a rod 12.

In this way, the nacelle 2 and the vane plate 10 always face the same direction and rotate together, so that the above-mentioned effects can be achieved more reliably. In addition, when the jμ is set to free yaw, the wing plate 1
0 also serves as a guide to stabilize the direction of the nacelle 2, improving stability.

This invention is not only effective when applied to a downwind type wind power generator using monopole supports as described in "-", but can also be applied to a certain extent to those using pipe 1 to lath supports. The effect can be obtained.

FIG. 8 shows a third embodiment of the present invention, in which a plurality of small blade plates 10' are installed on a portion of a pipe 13a forming a support 13 of a pipe truss, which faces the blades 3a of a wind turbine A. (in this example, 2 sheets on the wind turbine side)
(2 pieces each) are attached to each pipe so that they can rotate freely. The shape of each vane 10' is substantially the same as that of the first embodiment.

Figure 9 shows another example of a vane, in which two symmetrical vanes 14.
' is tilted so as to narrow the interval on the tip P side and is fixed to the ring 16 by stays 15, 15, and this ring 1
6 is rotatably attached to the support column 1.

Even when such a vane is used, the same effects as in each of the above-described embodiments can be obtained.

As explained hereinabove, the downwind type wind power generation device according to the present invention includes a wing plate having a streamlined circumferential surface on a portion of the strut that rotatably supports the nacelle and faces the blades of the wind turbine. Since it is rotatably mounted, it eliminates the generation of vortices and a drop in flow velocity on the downstream side of the support, and the installation by swinging the blade prevents damage to the part, and also prevents the generation of noise due to vibration of the blade. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram schematically showing the main parts of a wind power generation device, and FIGS. 2 and 3 are a front view and a side view showing an example of a conventional downwind type wind power generation device. 4 and 5 are a front view and a side view showing a first embodiment of the present invention, and FIG. 6 is an enlarged sectional view taken along line a-a in FIG. 5. FIG. 7 is a side view showing a second embodiment of the invention, and FIG. 8 is a side view showing a third embodiment of the invention. FIG. 9 shows a sixth example of a vane plate used in the present invention.
It is a sectional view similar to the figure. 1... Strut (monopole) 2... Nacelle 3... Wind turbine 6a... Blade 3b... Shaft part
3c...Mounting part 5-・Generator
8-... Yaw device 10.10' - Wing plate 11
...Ball bearing 12 Rod 13 ・
Support column (pipe truss) 14.14' Vane plate Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9

Claims (1)

[Claims] 1. A nacelle including a wind turbine and a generator driven by the wind turbine is rotatably mounted on the upper end of a support, and the wind turbine is rotated on the leeward side of the support. A downwind type wind power generation device according to the present invention, characterized in that a vane plate having a streamlined circumferential surface is attached to a portion of the support column facing the blades of the wind turbine so as to be rotatable about the support support. Wind-type wind power generation device.