WINDSCREW

Abstract: A windscrew is a wind rotor characterised in that it rotates when the axis of the rotor is at right angles (fig. 1 and 2) to the wind and when it is located in the direction of the wind (fig. 3 and 4). It operates with unmodified efficiency also in all positions between the vertical (fig. 1 and 2) and the horizontal position (fig. 3 and 4) and always turns the same surfaces towards the wind irrespective of the position of the rotor shaft (B). The rotor wings have a somewhat cambered surface (fig. 1 and 3). The said factors have enable solution of the difficulties inherent in designing a rotor for use at low wind velocities (fig. 1 and 2) and in storms (fig. 3 and 4). The rotor consists of two wings helically twisted about their axis of rotation (fig. 2) by 180 degrees and with a cross-section consisting of two semi-circles (fig. 4x1 and 4x2). The rotor does not comprise end plates and it is possible therefore for the air flow to pass through it from its end (fig. 4) for when the rotor is in the horizontal position it opposes the wind with only one circular surface (fig. 4). The rotor also includes a foundation (C.D.) enabling it to rotate vertically (fig. 1 and 2), horizontally (fig. 3 and 4) and in all intermediate positions while at the same time following the direction of the wind.

Description: Ϊ.'INDSCRSW The present design constitutes a wind rotor for producing energy under particularly demanding conditions, where the wind velocity may vary considerably, for instance in Greeland and in the Sahara, areas in which wind rotors have proved to be impracticable. By reinforcing such wind rotors they are made excessively heavy. The windscrew rotor operates at wind velocities from 3 t_/s upward (fig. 1 and 2) but it also withstands wind velocities as high as 180 m/ε (fig. 3 and ). It is so designed as to operate also in sandstorms such as occur daily in the Sahara and where the wind velocities may reach 85 m/s. Owing to its simple design the windscrew rotor can also be used at very low temperatures, where it is, for instance, impossible to make use of hydraulic power transmission. Nor do elevated temperatures impede the operation of this design. The design is principally intended for generating relatively small amounts of electrical energy under difficult conditions, where the use of large, energy-consuming plant is uneconomical.. In view of its design the windscrew rotor rotates under all conditions thus continuously meeting its task of producing energy, owing to the fact that it rotates also during displacement between the vertical (fig. 1 and 2) and horizontal (fig. 3 and 4) positions. The following patents relate to the design and are associated with its U.S. patent 4 . I 12,311 Swedish patent 65940 German patent 2540757- The design of the windscrew rotor is closest to that described in Swedish patent 65940 but with the decisive difference that the present wind rotor rotates also if the a^cis of rotation iε located in the direction of the wind (fig. 3 a - n< ^ 4) • It is an ir.ρrovement and further development of rotors based on the same wing idea. This rotor is made without end plates. The wings of the rotor may be assumed to be generated by twisting a tube of rigid material 180 degrees about an axis so as to produce a helical shape (fig. 2). Then the tube is halved lengthwise and at OMPI ° right angles in respect of the axis about which it is twisted. Following separation in two halves every cross-section of the tube exhibits two semi-circles of identical size (fig. 4 - x1,x2). The windscrew rotor rotates in the vertical position (fig. 1 and 2) and moves steplessly into the horizontal position (fig. 3 and 4), in. the direction of the wind and subject to continuous rotation. In the horizontal position the side facing the wind constitutes a circular surface (fig. 4) which responds to the force of the wind over virtually its entire area. In the vertical position (fig. 1 and _) the rotor always comprises a relatively large (fig. 1 ) or two relatively small (fig. 2) concave surfaces alternately turned into the wind so that the concave surface facing the wind is roughly uniform at all times. Also the convex surface facing the wind operates owing to an opening at the centre of the rotor. For the cross-section of the rotor shows that the two semi-circular parts are displaced in relation to one another (fig. 4 x 1 a∑ii 4 ) so that an opening is formed through which air can pass. The two wings of the rotor are turned 180 degrees in relation to one another, from below upward and in the direction of rotation (fig. 2). As a result a greater part of the wind force is concentrated on the lower part of the rotor than on its upper part, which contributes to the strength of the design, and even in the loaded state the speed of the rotor corresponds to about 1.2 times the velocity of the wind. The windscrew rotor is maintained in its vertical position by a spring installed in the transverse shaft (A) of the foundation. As the force of the wind increases to values entailing dangerous loading of the wings and the rotor shaft (B)the rotor turns stoplessly to the horizontal position in the direction of the wind (fig. 3 εnd 4) • Since it rotates also in this position it can take advantage of even very large wind forces. The design offers the advantage of low production costs considering its efficiency under the conditions for which it is intended. OMPI " WIPO

Claims: PATENT CLAIMS 1. A wind rotor, c h a r a c t e r i s e d in that it consists of two screw-shaped wings the cross-section of which is semi¬ circular (fig. 4 - x1 and x2) and in that there is an opening between them where the wind passes from the concave to the convex surface. The wings are mounted without end plates. The height of the rotor is at least four times the diameter. 2. A wind rotor according to claim 1, c h a r a c t e r i s e d in that it rotates in all positions from the vertical (fig. 1 and 2) to the horizontal position (fig. 3 ≥^cL 4) since the screw-shaped wings are twisted 180 degrees about.the axis of the rotor (fig. 2). 3. A wind rotor in accordance with claims 1 and 2, c h a r a c t e r¬ i s e d in that, calculated from the base and in the direction of rotation of the rotor, the wings are twisted in relation to one another by 180 degrees (fig. 1, 2 and 3). 4. A wind rotor in accordance with claims 1, 2 and 3. c h a r a c t e r i s e d in that it is provided with an arrange¬ ment (A.CD.) enabling it to move steplessly from the vertical position to the horizontal position and vice versa in the direction of the wind. OMPI

Inventors: JOUTSINIEMI R
Applicants: JOUTSINIEMI R
Application year: 1980
Main classification: F03D5
IPC codes: F03D5