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EP-4741652-A1 - WIND POWER PLANT

EP4741652A1EP 4741652 A1EP4741652 A1EP 4741652A1EP-4741652-A1

Abstract

The present invention relates to a wind turbine comprising a rotor (49) with a rotor shaft (13) extending in a vertical direction; a tower (33) in which the rotor shaft (13) is mounted; an output shaft (24) arranged in the tower (33) and configured to be driven by the rotor shaft (13); several rotor blades (12a, 12b, 12c) coupled to the rotor (49) by means of a traction drive (150) and extending in a vertical direction, wherein the rotor blades (12a, 12b, 12c) are arranged in a horizontal plane on an oval guide track (151) and are configured to rotate around the rotor (49) on the oval guide track (151); and wherein the oval guideway (151) has on one side (152) a width corresponding to a width (60a) of a maximum wind attack area of the rotor blades (12a, 12b, 12c), and on an opposite side (153) a width corresponding to a width (60b) of a minimum wind attack area of the rotor blades (12a, 12b, 12c).

Inventors

  • FEHMI, Mustafa

Assignees

  • FNF Innovation Sh.P.K.

Dates

Publication Date
20260513
Application Date
20241106

Claims (15)

  1. Wind turbine, comprehensive - a rotor (49) with a rotor shaft (13) extending in a vertical direction; - a tower (33) in which the rotor shaft (13) is mounted; - an output shaft (24) which is arranged in the tower (33) and is designed to be driven by the rotor shaft (13), - several rotor blades (12a, 12b, 12c) which are coupled to the rotor (49) by means of a traction drive (150) and extend in a vertical direction, wherein the rotor blades (12a, 12b, 12c) are arranged in a horizontal plane on an oval guide track (151) and are configured to rotate on the oval guide track (151) around the rotor (49), and wherein the oval guideway (151) has on one side (152) a width corresponding to a width (60a) of a maximum wind attack area of the rotor blades (12a, 12b, 12c), and on an opposite side (153) a width corresponding to a width (60b) of a minimum wind attack area of the rotor blades (12a, 12b, 12c).
  2. Wind turbine according to claim 1, wherein the oval guide track (151) comprises two arc-shaped sections (151b) whose width continuously decreases from the width of one side (152) to the width of the opposite side (153).
  3. Wind turbine according to claim 1 or 2, wherein the oval guide track (151) is configured to reduce the width (60a, 60b) of the rotor blades (12a, 12b, 12c) from a value at maximum wind attack area to a value at minimum wind attack area and vice versa.
  4. Wind turbine according to one of the preceding claims, wherein the rotor blades (12a, 12b, 12c) are foldable or collapsible along their longitudinal axis (51) to adjust the minimum wind attack area.
  5. Wind power plant according to one of the preceding claims, wherein a length of a straight section (151a) of the oval guide track (151) corresponds to a circumference of the rotor (49).
  6. Wind power plant according to one of the preceding claims, wherein the traction drive (150) adjoins an inner circumference of the oval guide track (151), and at least one guide rail (11, 44) is arranged on an outer circumference of the oval guide track (151).
  7. Wind turbine according to claim 6, wherein the rotor blades (12a, 12b, 12c) are connected on a side facing the inner circumference of the oval guide track (151) to at least one traction element (10, 46) of the traction element drive (150), and are guided on a side facing the outer circumference of the oval guide track (151) in the at least one guide rail (11, 44).
  8. Wind turbine according to one of the preceding claims, wherein the traction drive (150) is designed as a chain drive (150) or belt drive with three pairs of gears (1, 7, 5; 48, 53, 52; 43, 39, 40) or pairs of pulleys arranged side by side on an inside of the oval guide track (151), wherein a middle pair of the three pairs of gears (1, 7, 5; 48, 53, 52; 43, 39, 40) or pairs of pulleys comprises the rotor (49).
  9. Wind power plant according to claim 8, wherein each gear pair (1, 7, 5; 48, 53, 52; 43, 39, 40) or pulley pair comprises two gears (1, 7; 48, 53; 43, 39) or pulleys spaced apart vertically from each other and mounted on a shaft (5, 52, 40).
  10. Wind turbine according to one of claims 8 or 9, wherein the chain drive (150) or the belt drive with the three gear pairs (1, 7, 5; 48, 53, 52; 43, 39, 40) or pulley pairs in a frame (69, 78).
  11. Wind power plant according to one of the preceding claims, wherein the output shaft (24) in the tower (33) is arranged to be driven by the rotor shaft (13) via an angle gearbox (15, 35) and/or one or more crankshafts (17, 30).
  12. Wind turbine according to claim 11, wherein the rotor shaft (13) is connected to a first crankshaft (17) via the angle gear (15, 35) and the first crankshaft (17) is connected to a second crankshaft (30) via several traction elements (18, 19, 32).
  13. Wind power plant according to claim 12, wherein the traction means (18, 19, 32) are attached to corresponding crank throws of the first and second crankshaft (17, 30).
  14. Wind power plant according to claim 12 or 13, wherein the second crankshaft (30) is arranged on a foundation (28) of the tower (33) and the first crankshaft (17) is arranged at a certain height in the tower (33).
  15. Use of the wind turbine according to one of the preceding claims for driving a generator (22) or a machine.

Description

The present invention relates to a wind turbine with a vertical axis of rotation. Wind turbines with a vertical axis of rotation are known in the state of the art. For example, it shows WO 2019/002549 A1 A vertical wind turbine with a plurality of vertical blades, which are independently rotatable about a respective blade axis by means of a motor and are mounted to rotate on a common circular path about a vertical rotor axis, wherein the blades are each held attached to at least one pitch motor for motor rotation of the blades about their respective blade axis. The present invention aims to provide a wind turbine with a vertical axis of rotation, which has improved wind utilization, leading to increased power output. The present invention therefore provides a wind turbine comprising a tower, a rotor with a rotor shaft, several rotor blades coupled to the rotor by means of a traction drive, and an output shaft. The rotor shaft extends vertically and is mounted in the tower. Likewise, the output shaft, which is driven by the rotor shaft, is located in the tower. A generator, for example, driven by the wind turbine, can be connected to the output shaft. It is also possible to connect other driven machines, components, or systems to the output shaft. The rotor blades of the wind turbine extend vertically and are arranged in a horizontal plane on an oval guide track, on which they rotate around the rotor. In particular, three rotor blades can be arranged on the guide track, with the distance between the individual rotor blades corresponding to one circumference of the rotor. The oval guideway has a width on one side that corresponds to the width of the maximum wind attack area of the rotor blades. On the opposite side, the guideway has a width that corresponds to the width of the minimum wind attack area of the rotor blades. These two sides can, in particular, be the longitudinal sides of the oval guideway. This results in the rotor blades on one side of the guideway facing the wind with their maximum surface area exposed to the wind, while on the opposite side they are positioned with only a minimal surface area exposed to the wind. Consequently, the wind exerts a force primarily on the rotor blades on one side, causing the rotor to rotate via the traction drive. Specifically, the rotor blades on one side can be positioned with their maximum surface area exposed to the wind in such a way that the resulting force acts perpendicular to them (maximum force). By using at least three rotor blades, at least one blade can always be located on the side of the guideway where its maximum wind-exposed surface area is exposed to the wind flow. This allows the rotor to be accelerated from a standstill without any further measures. The oval guide track can, in particular, have two opposing arc-shaped sections, between which two straight sections are arranged. In other words, the two arc-shaped sections can be connected to each other via the two straight sections. The arc-shaped sections can advantageously have a central angle in the range of 90° to 270° and, in particular, a central angle of 180°. In a preferred embodiment, the length of a straight section of the oval guide track can correspond to the circumference of the rotor. In particular, a straight section on one side and a straight section on the opposite side can both have the described length. This allows for a complete rotation of the rotor to be measured in a single, straight section. The rotation of the rotor exerts maximum force on the at least one rotor blade that faces the wind stream with its maximum wind-exposed area. Consequently, the oval guide path design allows for increased performance compared to a circular rotation of the rotor blades around the rotor. According to a further embodiment, the oval guide track can be configured to reduce the width of the rotor blades from a value at maximum wind attack area to a value at minimum wind attack area, and vice versa. In other words, the guide track can be used to vary the width of the rotor blades such that they have their maximum wind attack area on one side and their minimum on the opposite side. In a preferred embodiment, the width of the two arc-shaped sections can continuously decrease from the width of one side to the width of the opposite side. In other words, the guideway can become continuously narrower along the length of one of the two arc-shaped sections as the rotor blades move from one longitudinal side to the opposite longitudinal side, and continuously widen along the length of the other arc-shaped section as the rotor blades move back from the opposite longitudinal side to one longitudinal side. By narrowing the guideway in the arc-shaped sections, the wind-exposed area of the rotor blades can be reduced, and by widening the guideway in the arc-shaped sections, the wind-exposed area of the rotor blades can be increased. According to one embodiment, this can be achieved by making the rotor bl