WO2011105970A4

WO2011105970A4 - Wind generator with vertical rotation axis, in particular for mobile applications

Info

Publication number: WO2011105970A4
Application number: PCT/SK2011/050001
Authority: WO
Inventors: Miloš BORTEL
Original assignee: Bortel Milos
Priority date: 2010-02-25
Filing date: 2011-02-24
Publication date: 2012-05-10
Also published as: WO2011105970A3; SK500062010A3; EP2539583A2; WO2011105970A2

Abstract

The wind generator with vertical rotation axis, in particular for mobile applications, consisting of at least two blades (3), which are attached on the central shaft (2) by means of fixing set (1) of elements, forming the shifting mechanism for continuous change of the distance (L) between blades (3) and the shaft (2). The longitudinal axis (10) of each blade (3) is parallel with longitudinal axis (11) of the shaft (2). Each blade (3) is connected by joints with the shaft (2) by means of at least two arms (5) and at least one draw-bar (8) connected with servo-mechanism (9) is attached on least one of them for adjusting the angle (a) between shaft longitudinal axis (11) towards the arm (5) and thereby also for change of the distance (L) between blades (3) and the shaft (2).

Description

Wind generator with vertical rotation axis, in particular for mobile applications

Technical Field

The present invention relates to the wind generator with vertical rotation axis, in particular for mobile applications designed for generation of electric, mechanical or other form of energy.

Background Art

Presently known wind generators with vertical rotation axis, in particular for mobile applications are designed so that fixing set of elements for attaching blades includes only mechanism for power output regulation. The mechanism for reducing volume when changing working position to transport one is either not designed at all or solved by complicated additional operations. Attachment mechanisms of blades of wind generators with vertical rotation axis including mechanism for power output regulation by change of working blades position to the rotating shaft are solved for instance in patents US4087202, US4105363, US2008/0095608 A1. In these systems, power output (revolutions) regulation of wind generators is done by change of angle forming longitudinal axis of working blade with longitudinal axis of rotating shaft. Additional operations has to be done for transition from working position into transport one. Pair of arms in the RU2364748 C1 patent is connected on the side of working blade with one console, on which there is working blade attached in rotary manner. Change of blades rotation diameter and therefore also volume of the generator is done by mechanism with geared segment placed on the arm in the part of rotating shaft.

Shortcoming of mentioned designs is that they deal only with ability of regulation of power output at high wind speeds, or by change of angle of working blade pitch during its rotation around the shaft. They do not solve the possibility of reducing wind generator volume to the smallest possible volume in transportation position, or incorporating system for change from working position into transport position into the system for power output regulation.

Disclosure of Invention

Mentioned disadvantages are eliminated to the substantial degree by the wind generator with vertical rotation axis, in particular for mobile applications, consisting of at least two blades, which are attached on the central shaft by means of fixing set of elements, according to the present invention, the substance whereof resides in that the fixing set of elements is constructed as shifting mechanism for continuous change of the distance between blades and the shaft, and thereby also for regulation of the generator’s power output in the working position during rotation of blades, as well as for reducing its volume at change of working position to transport one during stagnation of blades, while longitudinal axis of each blade is parallel with longitudinal axis of the shaft.

Sliding mechanism consists of arms mutually interconnected by joints, draw-bars and servo-mechanism.

At least two arms are connected by joints to each blade, and at least one draw-bar connected with servo-mechanism is attached on least one of arms.

The servo-mechanism serves for adjusting the angle between shaft longitudinal axis and the arm and thereby also for change of the distance between blades and the shaft.

Each of blades is advantageously connected with the arm by means of outer joint, the bearing surface whereof is structurally arranged according to the blade profile.

The arm is advantageously connected with the shaft by means of internal joint, which is provided as part of the shaft.

The servo-mechanism is interconnected with control unit, which is connected to driven device and/or its revolutions sensor.

The advantage of mentioned design is that simple construction of shifting fixing mechanism of blades is used for regulation of the generator’s power output as well as for reducing its volume at change of working position to transport one.

Brief Description of Drawings

The design is further elucidated on enclosed figures, where:

Figure 1 shows basic construction of the wind generator in working position

Figure 2 shows the wind generator in the conditions with maximum distance of blades from the shaft

Figure 3 shows the wind generator in the conditions with reduced distance of blades from the shaft

Figure 4 shows the wind generator in the conditions with minimum distance of blades from the shaft

Figure 5 shows the wind generator in transport position

Mode(s) for Carrying Out the Invention

Lower part of the shaft 2 is placed vertically in the central construction 21 (Figure 1) by means of roller bearings. The fixing set 1 of elements consists of arms 5 mutually interconnected by joints, draw-bars 8 and servo-mechanism 9. Joint mechanisms, each with three inner joints 6, which are arranged in the shape of “Y” letter and mutually symmetrically shifter by 120°, are provided in the upper part of the shaft 2 in two planes (upper and lower). One arm 5 is attached to each inner joint 6, and there are six arms in total. There is one blade 3 attached on ends of each pair of arms 5 (upper and lower), by means of two outer joints 7, bearing surface whereof is formed according to the blade 3 profile. Vertical draw-bars 8 are attached on all three upper arms 5 by their upper ends. Their lower ends are connected in the servo-mechanism 9 placed on the central construction 21. Lower end of the shaft 2 is connected with driven device 4 (Figure 2), which includes revolutions sensor 12. The control unit 13 is connected to the revolutions sensor 12 as well as to the servo-mechanism 9 for its control.

When the generator is active, the wind pushes by its force to blades 3 and these transfer the torque through arms 5 to the shaft 2, which is rotating in the central construction 21. Rotating shaft 2 acts upon driven device 4. Revolutions sensor 12 evaluates rotation speed, which is transferred to the control unit 13. When upper limit rotation speed is exceeded, the control unit 13 sends the signal into the servo-mechanism 9. This, by shifting draw-bars 8 in the downwards direction, turns arms 5 (Figure 3) in such manner that it reduces the angle a between shaft longitudinal axis 11 and the arm 5. Thereby the distance L between blades 3 and the shaft 2 is reduced, what causes decrease of the generator’s power output, whereby revolutions of the shaft 2 decrease. When the rotation speed drops below lower limit value, the control unit 13 sends the signal to the servo-mechanism 9 for shifting draw-bars 8 in the upward direction, what turns arms 5 so that the angle a increases. Thereby the distance L is increased, what causes increase of the generator’s power output, whereby revolutions of the shaft 2 increase. According to used construction of two parallel arms 5 for each blade 3, the blade longitudinal axis 10 remains parallel with the shaft longitudinal axis 11 in any distance L and any angle a.

When transport of the generator (Figure 4, Figure 5) is needed, draw-bars 8 are shifted by the servo-mechanism 9 downwards to the lowest position. Thereby arms 5 are turned in such manner that the angle a equals to zero and the distance L between blades 3 and the shaft 2 remains minimum. Thereby minimum total volume of the generator for easier transport is achieved. For re-activation of the generator, draw-bars 8 are shifted upwards for increasing its volume.

Claims

The wind generator with vertical rotation axis, in particular for mobile applications, consisting of at least two blades, which are attached on the central shaft by means of fixing set of elements, characterized in that the fixing set (1) of elements forms the shifting mechanism for continuous change of the distance (L) between blades (3) and the shaft (2), which is attached to the driven device (4), and thereby also for regulation of the generator’s power output in the working position during rotation of blades (3), as well as for reducing its volume from working position to transport one during stagnation of blades (3), while longitudinal axis (10) of each blade (3) is parallel with longitudinal axis (11) of the shaft (2) in working as well as transport position.
The wind generator according to the claim 1 characterized in that the fixing set (1) of elements consists of arms (5) mutually connected by joints, draw-bars (8) and servo-mechanism (9).
The wind generator according to the claims 1 and 2 characterized in that at least two arms (5) are connected by joints to each blade (3), and at least one draw-bar (8) connected with servo-mechanism (9) is attached on at least one of arms for adjusting angle (a) between shaft longitudinal axis (11) and the arm (5) and thereby also for change of the distance (L) between blades (3) and the shaft (2).
The wind generator according to the claims 1 to 3 characterized in that each of blades (3) is connected with the arm (5) by means of outer joint (7), the bearing surface whereof is structurally arranged according to the blade profile (3) and the arm (5) is connected with the shaft (2) by means of internal joint (6), which is provided as part of the shaft (2).
The wind generator according to the claims 1 to 4 characterized in that the servo-mechanism (9) is interconnected with the control unit (13) for controlling and regulating change of the distance (L) between the blades (3) and the shaft (2), which is interconnected with driven device (4) and/or its revolutions sensor (12).