JP2005171868A - Compound windmill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compound windmill of an extremely simple structure starting rotation with a breeze and efficiently rotating from low speed to high speed and not damaging a motor at high speed rotation. <P>SOLUTION: A Darrieus style windmill 10 is provided at a lower stage, a low speed windmill 20 is provided at an upper stage. A vertical shaft of the Darrieus style windmill and a vertical shaft of a low speed windmill are connected by a one-way clutch 30 transmitting rotation of the low speed windmill to the vertical shaft of the Darrieus style windmill but not transmitting rotation of the vertical shaft of the Darrieus style windmill to the low speed windmill. A lower part power generator is connected to a lower part of the vertical shaft of the Darrieus style windmill and an upper part generator is connected to an upper part of the vertical shaft of the low speed windmill. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a windmill, and more particularly to a compound windmill in which two types of windmills are connected.

Various types of windmills are conventionally known.
For example, as a wind turbine rotating at a relatively low speed, a wooden blade with canvas attached to a horizontal shaft, a Dutch wind turbine used for milling, etc., an S-shape with a plate bent into an S shape and attached to a rotating shaft There are known rotors, Savonius type windmills that cut a cylinder in half and rotate in the circumferential direction around the vertical axis, and sail wing type windmills with triangular sails.

  In addition, examples of rotating at medium speed include a multi-blade windmill with a large number of blades, and a paddle type windmill with a hemispherical wind receiving surface often used for anemometers.

  Furthermore, as a windmill that rotates at high speed, a Darrieus-type windmill that is a windmill that is bent on an airfoil with the same cross section as an airplane blade and attached to a vertical axis, and has the same airfoil as an airplane propeller, and rotates at high speed. Propeller type windmills that are windmills are known.

  In particular, the Darrieus-type windmill can be rotated at a higher rotational speed than the wind speed because the blade having the blade cross section of the airplane receives lift, so that high power generation efficiency can be achieved.

  Further, the Darrieus type windmill has an advantage that it is not influenced by the wind direction because the rotation axis is vertical.

  However, due to its structure, the Darrieus wind turbine cannot start rotating itself. For this reason, it is necessary to combine with other windmills and motors that start rotating with a slight breeze.

  As an example of using such a Darrieus-type windmill, a Savonius-type windmill is integrally mounted on the rotating shaft together with the Darrieus-type windmill. A windmill that rotates at high speed is known as a hybrid windmill.

  However, in such a conventional hybrid windmill, since the power generation efficiency of the generator connected to the Darrieus type windmill at low speed rotation is low, there is a problem that the power generation efficiency at low speed rotation is low, When rotating at high speed with a Darrieus-type windmill, there is a problem that the strength of the Savonius slater must be sufficiently increased because the Savonius slater rotates at a high speed together. In order to prevent these problems, it is necessary to install a device that restricts the rotational speed. By providing such a rotational speed restricting device, the hybrid wind turbine becomes complicated and the equipment cost becomes expensive.

  The present invention eliminates the problems associated with such conventional hybrid wind turbines, starts rotating with a breeze, efficiently rotates from low speed rotation to high speed rotation, without being damaged even at high speed rotation, An object of the present invention is to provide a complex wind turbine having an extremely simple structure.

  In the present invention, a Darrieus-type windmill in which an airfoil having the same cross section as an airplane blade is bent into an arcuate shape and attached to a rotatable vertical axis, and a low-speed windmill having a second vertical axis arranged coaxially with the vertical axis The rotation of the low-speed wind turbine is transmitted to the vertical axis of the Darrieus-type wind turbine and the rotation of the vertical axis of the Darius-type wind turbine is not transmitted to the low-speed wind turbine by the one-way clutch. The above object is achieved by a compound wind turbine in which the vertical shaft of the low-speed wind turbine is connected.

  In this case, the Darrieus wind turbine is provided in the lower stage, the low speed wind turbine is provided in the upper stage, the lower generator is connected to the lower part of the vertical axis of the Darrieus wind turbine, and the upper part of the vertical axis of the low speed wind turbine. It is preferable that the upper generator is connected to the main body.

  In the present invention, the low-speed wind turbine is preferably an S-type wind turbine, a Savonius-type wind turbine, or a paddle-type wind turbine.

  In the present invention, a Darrieus-type windmill with extremely high power generation efficiency during high-speed rotation and a low-speed windmill suitable for low-speed rotation are connected using a one-way clutch, and at the start of rotation or during low-speed rotation, the low-speed windmill is rotated. The rotation is started, and this rotation is transmitted to the Darrieus type windmill through the one-way clutch, so that the Darius type windmill also starts to rotate.

  The Darius type windmill receives the lift of the blade with the blade cross section of the airplane, so that the peripheral speed of the blade is increased to a higher rotational speed than the wind speed, but the rotation of the Darius type windmill is transmitted to the low speed windmill by the one-way clutch. Therefore, the low-speed wind turbine only needs to keep rotating at a relatively low speed as the low-speed wind turbine, and the low-speed wind turbine is not damaged even at high-speed rotation.

  Further, in the present invention, by attaching a low-speed generator and a high-speed generator to the Darrieus-type wind turbine and the low-speed wind turbine, respectively, it is possible to generate power with the power generation efficiency most suitable for each rotation. As a result, during low-speed rotation, power is generated with optimum power generation efficiency mainly by the low-speed wind turbine, and during high-speed rotation, high-speed power generation is performed by the Darrieus-type wind turbine by the high-speed generator, and the power generation efficiency is extremely enhanced at any rotation speed. .

  The low-speed windmill used in the present invention is preferably started with a small force at the time of startup, and specifically, an S-shaped windmill, a Savonius-type windmill, a paddle-shaped windmill, or the like can be used.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings illustrating embodiments of the present invention. FIG. 1 is a perspective view of a compound wind turbine according to the present invention, and FIG. 2 is a front view thereof.

  In the present invention, a plurality of narrow blades 12 having a cross-sectional shape of an airplane wing are attached to a rotating shaft 11 of a Darrieus type windmill 10 provided vertically. A lower generator 14 is connected to a lower end portion of the vertical rotating shaft 11 of the Darrieus motor via a speed increasing belt 13. In this embodiment, the lower generator 14 uses a 3.7 kilowatt generator. As a result, when the Darrieus wind turbine rotates, the vertical rotating shaft 11 is rotated by the rotation, and the rotation is accelerated by the speed increasing belt 13 to rotate the lower generator 14 at a high speed.

  In addition, a rotation shaft 21 of the low-speed wind turbine 20 is provided vertically so as to be coaxial with the vertical rotation shaft 11 of the Darrieus wind turbine 10. In this embodiment, a bucket blade wind turbine having four blades is used as the low speed wind turbine 20. An upper generator 24 is connected to an upper portion of a vertical rotating shaft 21 of the low-speed wind turbine 20 (bucket type wind turbine) via a speed increaser 23. In this embodiment, the upper generator 24 is a 500 watt generator.

  The vertical rotation shaft 11 of the Darrieus wind turbine 10 and the vertical rotation shaft 21 of the low speed wind turbine 20 (bucket type wind turbine) are connected by a one-way clutch 30. The one-way clutch 30 transmits the rotation of the rotary shaft 21 of the low-speed wind turbine 20 (bucket type wind turbine in this embodiment) to the vertical rotary shaft 11 of the Darrieus wind turbine 10, but the vertical rotary shaft of the Darius wind turbine 10. 11 is not transmitted to the low speed wind turbine 20 (bucket type wind turbine). A commercially available one-way clutch 30 can be used as the one-way clutch 30 of the present invention.

  Further, in the present embodiment, as shown in FIG. 2, trapezoidal cross-sectional caps 41a and 41b are provided in the vicinity of the upper end and the lower end of the rotary shaft 11 of the Darrieus-type windmill 10, so The shape windmill 10 is collected at the center in the vertical direction.

  In the present embodiment having the above-described structure, the low-speed wind turbine 20 rotates at startup, and the rotational speed of the low-speed wind turbine 20 increases along the thin solid line in FIG. 3 as the wind speed increases. The upper generator 24 generates power from the wind turbine 20. At the same time, the rotation of the low-speed wind turbine 20 is transmitted to the Darius wind turbine 10 through the one-way clutch 30, and the Darius wind turbine 10 also starts rotating together. As a result, the Darius-type windmill 10 that cannot be rotated by itself starts to rotate, and the rotational speed of the Darius-type windmill 10 increases along the thick broken line and the thick solid line in FIG. 3 as the wind speed increases. 10, the lower generator 14 generates power.

  At this time, when the blade 12 of the Darius-type windmill 10 receives wind, the blade 12 generates lift, so that the peripheral speed of the Darius-type windmill 10 becomes higher than the wind speed of the wind. The rotational speed of the Darrieus-type windmill 10 exceeds the rotational speed of the low-speed windmill 20 at wind speeds equal to or higher than the intersections of the thin solid line indicating the speed characteristics and the broken line indicating the speed characteristics of the Darius-type windmill 10 and the thick solid line.

  By rotating in this way, the Darrieus type windmill 10 can generate the lower generator 14 with high efficiency. Further, even if the Darius-type windmill 10 rotates at a high speed, the rotation is not transmitted to the low-speed windmill 20 by the one-way clutch 30, so that the low-speed windmill 20 is excessively attached to the Darius-type windmill 10. Rotation at the rotation speed is prevented from being damaged. In the present invention, the Darrieus-type wind turbine 10 and the low-speed wind turbine 20 need only be connected by the one-way clutch 30, and it is not necessary to provide a special control mechanism for the one-way clutch 30. Cost can be made sufficiently low.

It is a perspective view of the Example of this invention. It is a front view of the present invention. It is a wind speed-power generation amount and rotational speed diagram for the composite wind turbine according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Darrieus type windmill 11 Rotating shaft 12 Blade 13 Speed increasing belt 14 Lower generator 20 Low speed wind turbine 21 Rotating shaft 23 Speed increasing device 24 Upper generator 30 One-way clutch 41a, 41b Wind cap

Claims (3)

A Darrieus-type windmill attached to a rotatable vertical axis by bending an airfoil having the same cross section as an airplane blade into an arcuate shape, and a low-speed windmill having a second vertical axis arranged coaxially with the vertical axis, The one-way clutch that transmits the rotation of the low-speed wind turbine to the vertical axis of the Darius-type wind turbine and does not transmit the rotation of the vertical axis of the Darius-type wind turbine to the low-speed wind turbine and the vertical axis of the Darius-type wind turbine and the low-speed wind turbine Combined with the vertical axis of the combined windmill. The Darrieus-type windmill is provided in the lower stage, the low-speed windmill is provided in the upper stage, and a lower generator is connected to the lower part of the vertical axis of the Darrieus-type windmill and at the upper part of the vertical axis of the low-speed windmill. The combined wind turbine according to claim 1, wherein an upper generator is connected. The combined windmill according to claim 1 or 2, wherein the low-speed windmill is any one of an S-shaped windmill, a Savonius-type windmill, and a paddle-shaped windmill.

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