Wing sail structure for wind-powered propulsion systems on ships

Abstract

The present invention relates to a wingsail structure (100) for a wind-assisted propulsion device (10) of a vessel (1) that can be stored in a small space. The wingsail structure (100) includes a rigid or semi-rigid main wingsail (110), a wingsail frame (101) including a flap (120) having an airfoil shape, and at least one upper connecting member (130) and a lower connecting member (140) connecting the main wingsail and the flap. The wingsail structure further includes a base part (20) arranged to be fixed to a body (3) of the vessel (1), and the wingsail frame is rotatable relative to the base part. The upper connecting member and the lower connecting member are configured to move the main wingsail and the flap to a first deployed standing position (I) and a second folded standing position (IIa, IIb). The wingsail structure further comprises a tilting device configured to move the wingsail frame (101) from the second folded and erected position (IIa; IIb) to a third tilted position (IIIa; IIIb).

Description

Technical Field

[0001] The present invention relates to a wing sail structure for a wind-assisted propulsion device of a ship, and a method of operating a wind-assisted propulsion device as defined in the appended claims.

Background Art

[0002] Sails have long been known as a means of propelling ships. Traditionally, flexible sails have been attached to masts to utilize the power of the wind to propel ships. Modern merchant ships generally use fossil fuels and combustion engines for ship propulsion. To reduce the overall consumption of fossil fuels, the use of wind propulsion has been proposed. For this purpose, rigid sails can be used. The output is related to a number of interrelated factors, but the wing area and other geometric aerodynamic characteristics are the main performance indicators. By combining a main wing and flaps, a geometric configuration is possible that can generate a large propulsion force according to the size of the wing compared to a wing without flaps. By adjusting the camber formed by the main wing sail and the flaps, a highly efficient wing sail device and structure can be obtained that can generate a large propulsion force relative to the absolute size. When the aerodynamic propulsion force from the wing sail is not desirable or when it is necessary to limit the propulsion force, it is necessary to consider the stability, safety, and operability of the ship. This increases the complexity and challenges when using a rigid wing sail as a ship propulsion device. In addition to this, the performance of a ship is related to the strength and direction of the prevailing wind. For example, from the statistical distribution of wind strength, it can be seen that the wind speed is quite gentle most of the time. Therefore, the characteristics of the wing need to be configured so that the wing sail can utilize low wind speeds and at the same time can safely handle the higher wind speeds that occur only more rarely.

[0003] The use of rigid sails has been discussed in the prior art. For example, U.S. Patent No. 10906620 discloses a reefable double airfoil comprising molded members for a forward and aft flaps that are traversed by a forward mast and can rotate around an axis defined thereby. In one modification, the flaps are configured as rigid boxes that are retractably nested in series. U.S. Patent No. 10906620 also discloses, as a variation, a double flap sail construction in which each flap is made by retractably overlapping a series of generally rigid box-shaped members. However, retractable nesting can lead to wear of the boxes, and as a result, problems may arise in the fit of the boxes when nesting them. If the boxes are damaged, it may become difficult to fold the sail, and as a result, the structure may be subjected to wind forces when propulsion by the wing sail is undesirable.

[0004] Rigid sails are publicly known, for example, by U.S. Patent No. 4,561,374, which discloses the structure of a rigid sail assembly including a rigid mainsail section and a rigid jibsail section, both having complementary airfoil configurations and being displaceable as a unit so as to be rotatable 360 ​​degrees with respect to the ship's centerline, while the jibsail section is independently displaceable in an arc within a predetermined angular range relative to the mainsail section. However, this structure may be affected by wind forces when the vessel is at anchor or when propulsion by wing sails is undesirable.

[0005] Another example of a rigid sail is shown in International Publication 2004 / 024556, which discloses an articulated rigid sail intended to provide wind propulsion for a water or land vehicle. The rigid sail consists of a mast to which multiple modules are mounted vertically spaced apart, and a rigid shell forming the sail is fixed. Each module, consisting of two articulated sections, allows the sail's profile to be curved. However, this sail presents problems when the vessel is at anchor. The surface of the sail, which enables the forward movement of the vessel while it is underway, continues to be affected by wind forces when the vessel is at anchor, which can have adverse effects on the vessel.

[0006] Therefore, considering known solutions, there is a need for a sail structure that can be positioned in a robust and space-saving manner in a neutral, non-propelled position when propulsion is undesirable, for example, when the vessel is at anchor. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] U.S. Patent No. 10906620 [Patent Document 2] U.S. Patent No. 4561374 [Patent Document 3] International Publication No. 2004 / 024556 [Overview of the project] [Problems that the invention aims to solve]

[0008] In light of the shortcomings and limitations of prior art solutions, the object of the present invention is to provide a vessel equipped with a wind-assisted propulsion arrangement that at least partially solves the problems of known solutions concerning the robust and space-saving placement of a sail structure in a neutral, non-propulsion position when propulsion is not desired.

[0009] However, since rigid sails cannot be compressed and telescopic solutions may not maintain sufficient strength in harsh weather conditions, it has become clear that storing large rigid wing structures in a space-saving manner is a challenge. Therefore, there is a recognized need to store rigid wing sails efficiently and robustly in a space-saving manner. Thus, a further objective of the present invention is to enable the storage of large rigid wing structures in a space-saving manner.

[0010] The above-mentioned objectives are achieved by the present invention as set forth in the attached independent claims. [Means for solving the problem]

[0011] According to a first aspect of the present invention, the present invention relates to a wing sail structure for a wind-assisted propulsion system of a ship, comprising a wing sail frame. The wing sail frame comprises a main wing sail, flaps, and at least one upper connecting member and at least one lower connecting member connecting the main wing sail and flaps. The main wing sail is rigid or semi-rigid and has an airfoil shape with a leading edge, trailing edge, upper end, lower end, and side walls extending between them. The flaps are also rigid or semi-rigid flaps and have an airfoil shape with a leading edge, trailing edge, upper end, lower end, and side walls extending between them. The flaps may be smaller than the main wing sail. The wing sail structure further comprises a base portion positioned to be fixed to the hull of the ship. The base portion is associated with the wing sail frame, and the wing sail frame is rotatable relative to the base portion via a first vertical pivot axis. The upper and lower connecting members are configured to move the main wing sail and / or flaps to a first deployed-up position and to move the main wing sail and / or flaps toward each other to a second folded-up position. The wing sail structure further includes a tilting device configured to move the wing sail frame from the second folded-up position to a third inclined position relative to the base.

[0012] The flaps and / or main wing sails can be folded before tilting the wing sail frame, allowing for space-saving storage.

[0013] In one embodiment, the upper and lower connecting members are configured to have a second axis of rotation for rotating the flap relative to the upper and lower connecting members. The upper and lower connecting members may further be configured to have a third axis of rotation for rotating the main wing sail relative to the upper and lower connecting members. This can further improve the adjustment of the camber provided by the wing sail frame.

[0014] The upper and lower connecting members are connected to the upper and lower ends of the corresponding main wing sails, respectively, and the flaps and lower connecting members are configured to provide a first axis of rotation for rotating the wing sail frame relative to the base. Therefore, when the connecting members rotate relative to the base, the entire wing sail frame can rotate.

[0015] In a further embodiment, the upper and lower connecting members are configured to provide a fourth axis of rotation associated with the main wing sail for rotating the flap relative to the main wing sail. In this way, the flap can rotate even when facing the same direction as the main wing sail, thereby allowing it to move laterally to the main wing sail, thereby providing means configured to move the flap to face either the same direction as or opposite to the main wing sail. Thus, the lateral length of the folded wing sail frame is further reduced compared to the unfolded wing sail frame, thereby further limiting the space required for the wing sail frame when in the tilted or stowed position.

[0016] The upper and lower connecting members can be connected to the upper and lower ends of the corresponding main wing sails and flaps, respectively. This facilitates, for example, access to react to the connecting members.

[0017] The upper and lower connecting members can be connected at positions away from their corresponding upper and lower ends, respectively. This allows them to be directly connected to their respective main wing sails and flaps.

[0018] In one embodiment, in a third inclined horizontal storage position, the wing sail frame is positioned horizontally such that the side walls extending between the leading and trailing edges of each main wing and flap face the hull of the ship. In this way, a robust storage position is provided.

[0019] In another embodiment, in a third inclined vertical storage position, the wing sail frame is positioned vertically such that the leading or trailing edge of the main wing sail faces the hull of the vessel and the trailing or leading edge of the flap faces the hull of the vessel.

[0020] The main wing sail and flaps are each composed of one or more semi-rigid or rigid modules that are detachably connected to one another, and can form an airfoil-shaped, integrated main wing sail or flap. Thus, the modular concept allows, for example, the wing sail frame to be assembled near or on the vessel to which it will be attached.

[0021] According to one embodiment, the present invention also relates to a wing sail frame including a main wing sail, flaps, and at least one upper connecting member and at least one lower connecting member connecting the main wing sail and the flaps. The main wing sail is rigid or semi-rigid and has an aerofoil shape with a leading edge, a trailing edge, an upper end, a lower end, and side walls extending between them. The flaps are also rigid or semi-rigid flaps and have an aerofoil shape with a leading edge, a trailing edge, an upper end, a lower end, and side walls extending between them. The flaps may be smaller than the main wing sail. The upper and lower connecting members are configured to bring the main wing sail and / or flaps to a first deployed-up position and to bring the main wing sail and / or flaps to a second folded-up position facing each other. The upper and lower connecting means are further configured to include a second pivot axis for rotating the flap relative to the upper and lower connecting members, and a third pivot axis for rotating the main wing sail relative to the upper and lower connecting members. Furthermore, the upper and lower connecting members are connected to the upper and lower ends of the corresponding main wing sails, and the flap and lower connecting members are configured to have a first pivot axis for rotating the wing sail frame relative to the base. The flap and / or main wing sail can be folded, allowing for space-saving storage and more flexible camber adjustment by the wing sail frame. The present invention further relates to a wing sail structure including a wing sail frame and a base connected to the hull of a vessel.

[0022] According to a further embodiment, the present invention also relates to a further wing sail frame comprising a main wing sail, a flap, and at least one upper connecting member and at least one lower connecting member connecting the main wing sail and the flap. The main wing sail is rigid or semi-rigid and has an airfoil shape with a leading edge, a trailing edge, an upper end, a lower end, and side walls extending therebetween. The flap is also a rigid flap or a semi-rigid flap and has an airfoil shape with a leading edge, a trailing edge, an upper end, a lower end, and side walls extending therebetween. The flap may be smaller than the main wing sail. The upper connecting member and the lower connecting member are configured to bring the main wing sail and / or the flap to a first deployed upright position and to bring the main wing sail and / or the flap to a second folded upright position facing each other. The upper connecting member and the lower connecting member are further configured to provide a fourth axis of rotation associated with the main wing sail for rotating the flap relative to the main wing sail. In this way, the flap can rotate even when facing in the same direction as the main wing sail, whereby it can move laterally to the main wing sail, thereby providing means configured to move the flap to face in the same or opposite direction as the main wing sail. The present invention further relates to a wing sail structure comprising a wing sail frame and a base connected to the hull of a ship.

[0023] Furthermore, the present invention relates to a wind-assisted propulsion device comprising at least one wing sail structure as described above, and a ship comprising the wind-assisted propulsion device.

[0024] Furthermore, the present invention relates to a method of operating at least one wing sail structure as described above in a wind-assisted propulsion device, - controlling the angle of rotation of the wing sail frame, the main wing sail, and / or the flap at a first upright propulsion position to provide a camber; - folding the flap towards the main wing sail to form a second folded upright position; - A step of tilting the wing sail frame toward the ship's main body to form a third tilted position; comprises.

Brief Description of the Drawings

[0025] Further features and advantages of the present invention will be described with reference to the accompanying drawings.

[0026] [Figure 1a] A ship equipped with a wind-assisted propulsion device is shown in a perspective view. [Figure 1b] A perspective view showing an embodiment of the wing sail structure included in the wind-assisted propulsion device in the deployed upright propulsion position (I). [Figure 2a] A view of the embodiment of Figure 1b from above in the deployed upright propulsion position (I). [Figure 2b] A view of the embodiment of Figure 2a from above in the folded upright position (IIa). [Figure 3] A perspective view showing a ship equipped with the wing sail structure of the wind-assisted propulsion device in the folded upright position (IIa). [Figure 4] A perspective view showing the state where the wing sail structure of the wind-assisted propulsion device is folded and tilted horizontally. [Figure 5a] A perspective view showing the wing sail structure of the wind-assisted propulsion device folded and tilted to the vertical position. [Figure 5b] The wing sail structure of Figure 5a is shown in more detail. [Figure 5c] A view of the wing sail structure of Figure 5a from the bottom. [Figure 6] A perspective view showing another embodiment of the wing sail structure included in the wind-assisted propulsion device in the deployed propulsion position (I). [Figure 7a] A view of the embodiment of Figure 6 from above. [Figure 7b] A view from above of the embodiment of Figure 6 showing the folded upright position (IIa). [Figure 7c] A view from above of the embodiment of Figure 6 showing the folded upright position (IIb). [Figure 8a] This is a perspective view showing yet another embodiment of the wing sail structure in the deployed and raised thrust position (I). [Figure 8b] This is a top view of the embodiment shown in Figure 8a. [Figure 8c] This is a top view of the embodiment shown in Figure 8a, in the folded-up standing position (IIa). [Figure 9] Figure 6 is a perspective view of a vessel equipped with a wing sail structure for a wind-powered propulsion system, shown in the folded-up position (IIa). [Figure 10] This is a perspective view showing the wing sail structure of a wind-powered propulsion system in a folded and horizontally tilted position. [Figure 11a] This is a perspective view showing the wing sail structure of a wind-powered propulsion system folded and tilted to a vertical position. [Figure 11b] The wing sail structure in Figure 11a is shown in more detail. [Figure 11c] This is a view of the wing sail structure shown in Figure 11a from the bottom. [Figure 12] A schematic diagram of the tilting and rotating mechanisms for the wing sail frame is shown. [Modes for carrying out the invention]

[0027] To utilize wind as a propulsion force for a ship, wing sails are designed to generate sufficient thrust, either on their own or in conjunction with the ship's engine, to overcome the ship's resistance. In this application, wing sails are generally defined as rigid or semi-rigid structures that resemble aircraft wings and can be fixed perpendicularly to the ship to generate propulsion through the action of wind. Such rigid wing sails must be designed to ensure safety when they cannot be used, for example, in bad weather, due to height restrictions on the chosen route, or while cargo is being handled.

[0028] The present invention provides a double wing sail configuration (hereinafter referred to as a wing sail frame) including a main wing sail and a flap. By folding the flap over the main wing sail, a more compact wing sail position can be obtained. At the same time, when in use, the flap can rotate along one or more vertical axes of rotation relative to the main wing sail, providing a camber that provides thrust. By providing a rotatable flap relative to the main wing sail, the amount of force generated can be adjusted by adjusting the camber formed by the main wing sail and the flap. Since the flap can be folded toward the main wing sail, the projected area of ​​the main wing sail frame can be reduced, and the space required for the main wing sail frame on the ship is also reduced. When the main wing sail and flap are folded, the force generated is also reduced. In this way, the minimum power configuration can be achieved under desirable conditions, which may be important for the safety, structural integrity, and maneuverability of the vessel.

[0029] To prevent thrust from the wing sail, the wing sail frame may be tilted horizontally toward the deck to an inclined position. The “inclined” position means a position in which the wing sail frame is tilted toward a horizontal position and / or toward the ship’s deck or a support on the deck. The wing sail frame may be stowed in this position, which is also referred to herein as the stowed position. When the main wing sail and flaps are folded in the inclined position, space on the ship’s deck can be saved compared to when the main wing sail and flaps are not folded. This is also illustrated in the attached drawings.

[0030] To provide an inclined position, the wing sail frame is inclined with respect to a horizontal axis from a vertical upright position to a horizontal position. The wing sail frame has a longitudinal axis that extends perpendicularly to the ship's deck when the wing sail frame is in the upright position. Thus, the wing sail frame is inclined with respect to a horizontal rotation axis that is perpendicular to the longitudinal axis and therefore essentially horizontal or transverse. In the inclined position, the longitudinal axis of the wing sail frame can therefore be essentially horizontal. However, inclined wing sails require a large amount of space on the ship's deck, making them difficult to find. Therefore, minimizing the required space as much as possible is important to enable wing sail arrangements, including multiple wing sail structures, to be installed on different types of ships. The present invention further provides a solution for minimizing the space required when positioning a wing sail in an inclined position.

[0031] According to the present invention, which aims to minimize the required space, the wing sail and flaps are moved from a first deployed upright position, in which the wing sail and flaps provide propulsion to the vessel, to a second folded upright position. The folded upright position means that the main wing sail and / or flaps rotate toward each other with respect to one or more vertical axes. The vertical axes are essentially parallel to the longitudinal axis of the wing sail frame in the upright position. When the main wing sail and flaps are positioned facing each other, they are at least partially overlapping when viewed in cross-section, i.e., from the front of the wing structure. The wing sail frame is inclined toward the deck of the vessel, with respect to a transverse or horizontal rotation axis perpendicular to the vertical rotation axis. Folding can be achieved, for example, by rotating the flaps to overlap the main wing sail. In this way, the wing sail frame can be stored in a neutral, non-propulsion position. Furthermore, when the main wing sail and flaps are folded, the lateral extension of the wing sail frame is reduced compared to when the wing sail frame is in the propulsion upright position. This is a significant advantage given the limited space on board a vessel. The wing sail frame is usually folded to the upright position before tilting, but this is not always necessary. Additionally, there is the advantage of reduced wind-induced lift and less stress on the components in strong winds. The wing sail can be tilted on the deck and stored in either a flat or upright position.

[0032] Wing sail structures, including wing sail frames and bases, and devices comprising one or more wing sail structures, may be used in vessels used for marine, i.e., as a means of water transport. The main wing sail and flaps are made of substantially rigid or semi-rigid material and have an airfoil shape. Both the main wing sail and flaps have side walls, leading edges, trailing edges, upper and lower ends. A “rigid” material is a combination of several materials that cannot be folded and can support its own weight when its parallel edges are subjected to it. A “semi-rigid” material is a material that is partially rigid and has some flexibility, and can support its own weight when its parallel edges are subjected to it.

[0033] In this application, the shape of an "aerofoil" refers to the profile (contour) of a wing that has an aerodynamic shape when viewed from a cross-section in the forward-to-backward direction, i.e., from the leading edge to the trailing edge. An aerodynamic airfoil shape is advantageous in that it allows air to pass more easily over the wing sail. The shape may be asymmetrical in the aforementioned direction, may include a symmetric cross-section, or the shape may be a symmetric airfoil. The airfoil shape is defined, for example, according to the NACA standardization series, but is not limited thereto.

[0034] To better understand the invention of this disclosure, the present invention will be described with reference to the accompanying drawings provided to illustrate examples of non-limiting embodiments of the invention.

[0035] Referring to Figure 1a, a vessel 1 is shown that includes a wind-assisted propulsion system 10 with three wing sail structures 100. Each wing sail structure 100 comprises a wing sail frame 101, schematically shown as a dotted rectangle in Figure 1b. Both the main wing sail 110 and the flaps 120 are rigid or semi-rigid, meaning they have some degree of flexibility. The wing sail structure is shown from further above in Figures 2a and 2b, which are also referenced here.

[0036] The wing sail structure 100 further includes a base 20 configured to be fixed to the hull 3 of the vessel 1. The base 20 is associated with the wing sail frame 101 and supports the frame when the wing sail frame is in an upright vertical position, i.e., the propulsion position (I) or the folded position (IIa, IIb). The base is associated with the wing sail frame when the wing sail frame is in an inclined position (IIIa, IIIb), in which case the wing sail frame is inclined with respect to the base, which is fixed directly or indirectly to the hull 3 of the vessel.

[0037] In the first deployed-upright position (I) shown in Figure 1a, the wing sail frame is positioned in the first upright-propelled position (I). The thrust provided by the main wing sail and flaps can be modified by changing the camber, that is, the degree of curvature and convexity of the shape of the main wing sail and flaps from the leading edge of the main wing sail to the trailing edge of the flaps. Figure 2a shows an example of camber in the first propelled-upright position (I) as viewed from above.

[0038] Both the main wing sail 110 and the flap 120 have an airfoil shape. The main wing sail has a leading edge 117, a trailing edge 118 (Figure 2a), an upper edge 115, a lower edge 116 (Figure 1b), and side walls 211, 212 (Figure 2a) extending between them. Similarly, the flap 120 has a leading edge 127 and a trailing edge 128 (Figure 2a), a leading edge 117, a trailing edge 118 (Figure 1b), and side walls 221, 222 (Figure 2a) extending between them. The airfoil shape tapers substantially from the leading edge to the trailing edge.

[0039] The sidewalls 221 and 222 are integrated together with the leading edge 127 and trailing edge 128 to form an airfoil shape. The sidewalls 221 and 222, along with the upper and lower ends 115 and 116, are formed by modules that are permanently or detachably attached to each other, and together the modules form an integrated wing sail or flap with an airfoil shape. The profiles of the wing sails and flaps may be designed with different modular elements that can be combined to realize wing sails of different sizes. The main wing sails and flaps may be made of any suitable material such as moldable polymer materials, fiberglass materials, carbon fiber materials, and / or composite materials, but are not limited to these.

[0040] The wing sail frame 101 further includes an upper connecting member 130 and a lower connecting member 140 configured to rotatably connect the main wing sail 110 and the flap 120 to each other. For example, they may include means for rotatably connecting the main wing sail and the flap, such as actuators and / or pivot axes connected to or included in one or both of the connecting members. Rotatably connected means that the main wing sail 110 and / or flap 120 can rotate toward each other about a vertical axis parallel to the longitudinal axis of the wing sail frame. In Figure 2a, this is indicated by arrow R and shows how the flap 120 rotates toward the main wing sail 110 about a second vertical pivot axis 112 from a first deployed upright position (I) to a second folded upright position (IIa) shown in Figure 2b. In this modification, the second pivot axis 112 of the upper connecting member 130 and the lower connecting member 140 is positioned so that the trailing edge 128 of the flap 120 rotates toward the leading edge 117 of the main wing sail 110. In this second folded position (IIa), the right side wall 222 of the flap is folded toward the right side wall 212 of the main wing sail 110. By folding the flap toward the main wing sail, as shown in Figure 2b, the transverse length T of the wing sail frame 101 shown between Figures 2a and 2b can be reduced. The rigid or semi-rigid main wing sail 110, the flap 120, and the upper and lower connecting members 130 and 140 form the frame 101 of the wing sail structure 100.

[0041] The wing sail frame may be connected to the base 20 via a shaft 22 (Figure 1b) that defines a first axis of rotation 111 (Figure 2a). The wing sail frame 101 can rotate relative to the base 20 via this first axis of rotation. A non-limiting schematic example of a rotating device 200 suitable for rotating the wing sail frame 101 is shown in Figure 12. Figure 12 is a simplified schematic diagram of a wing sail frame without flaps and is not to scale. The rotating device 200 is associated with a shaft 22, which is connected to the base 20 via an associated tilting device 300, which will be described in more detail below. The shaft 22 is connected to the wing sail frame 101 via the lower end 140 of the main wing sail 110 and can pass through the lower end 140.

[0042] In the illustrated non-limiting example, the shaft 22 has its upper end 24 housed inside the main wing sail 110. The shaft end 24 is connected to a drive unit 210 for rotating the wing sail frame 101 about a longitudinal pivot axis RW extending perpendicularly V to the deck of the ship's hull 3. The drive unit 210 may consist of an electric motor (not shown), a hydraulic actuator, or other suitable driving means including a manual crank arm. The shaft 22 is also connected to suitable upper and lower bearings 220 and 230 housed in a housing 240. The wing sail frame rotates around the shaft 22 by the drive unit and the upper and lower bearings (e.g., rolling bearings).

[0043] Generally, the main wing sail, flaps, and upper and lower coupling means include appropriate configurations that provide rotational motion relative to the axis of rotation, which may include, for example, shafts, bearings (e.g., roller bearings), actuators, and drive means. The rotation of the wing sail frame, main wing sail, and / or flaps can be controlled by incorporating electrically controllable means, etc., into each axis of rotation. The control unit can then be connected to the drive unit to adjust the rotation of the wing sail frame, main wing sail, and / or flaps. The rotation angles of the wing sail frame, main wing sail, and / or flaps are adjusted according to the surrounding conditions. The rotating devices of the main wing sail and flaps and their respective vertical axes of rotation may be positioned with stopping means so that the rotation angle is limited to a certain angle. Limiting the rotation angle can prevent, for example, uncontrolled rotation of the wing sail frame components in the event of changes in prevailing wind / weather conditions.

[0044] According to the present invention, by folding the flap 120 toward the main wing sail 110 and positioning the wing sail frame 101 in a third inclined storage position (IIIa), as shown in Figures 4, 5a, 10, and 11a, a space-saving inclined storage position (IIIa, IIIb) is obtained relative to the wing sail frame 101. The inclined position is a position that is substantially horizontal with respect to the ship's deck, and the wing sail frame is positioned toward the deck.

[0045] Referring here to Figure 3, the wing sail structure 100 is shown in a second folded-up position (IIa). In the upright position, the longitudinal axis L of the wing sail structure (shown in relation to only one structure 100) is essentially parallel to the general vertical axis V perpendicular to the horizontal axis H of the vessel 1. The horizontal axis H may extend in substantially the same direction as the deck floor. The wing sail structure also extends in a depth direction D perpendicular to the plane formed by the two-dimensional longitudinal direction L and transverse direction T. The length in the depth direction may increase as the flaps are folded toward the main wing sail.

[0046] To achieve the inclined position shown in Figure 4, the wing sail frame 101 is inclined around a lateral rotation axis RT, where the longitudinal axis L extends vertically in the vertical direction V when the wing sail frame is in the upright position IIa, and the lateral rotation axis RT is perpendicular to the longitudinal axis L and therefore approximately horizontal. The arrow RT indicates the direction of inclination with respect to the rotation axis RT, as shown in Figures 3 and 12. In the inclined position, the longitudinal axis L of the wing sail frame is essentially parallel or nearly parallel to the horizontal axis H. The inclination can be achieved by an inclination device 300 included in the wing sail structure 100.

[0047] Figure 12 shows a non-definitive schematic example of a tilting device 300 suitable for moving the wing sail frame 101 from a second upright position (II) to a third tilted stowed position (IIIa). The tilting device 300 is associated with a base 20 and a shaft 22, the shaft 22 being connected to the wing sail frame 101 via the main wing sail 110. The lower end 26 of the shaft 22 is connected to a tilting means 310 having a rotation axis RT, and with respect to this rotation axis RT, the wing sail frame 101 can be tilted in the direction indicated by the arrow RT. The tilting means 310 is connected to the base 20 via the rotation axis RT. The tilting means 310 further includes a locking means 312 for preventing tilting and fixing the shaft 22, and thus the wing sail frame 101, in the upright position. The locking means is released when tilting the wing sail frame 101. The tilting device 300 further comprises a tilting drive device 350, which includes a tilting cylinder 320 connected to the base 20. The tilting cylinder may be, for example, a hydraulic cylinder or a pneumatic cylinder. The tilting cylinder is rotatably connected at a second end to a moment shaft 330, which is further connected to shaft 22. When the wing sail frame is tilted, the locking mechanism is released. By driving the extension of cylinder 320, the moment shaft 330 presses against shaft 22 and rotates with respect to the rotation axis RT. In this way, the wing sail frame 101 connected to shaft 22 is tilted to tilted position IIIa with respect to the rotation axis RT, and the wing sail frame is retracted to a horizontal position, i.e., the side walls 211 or 212 of the main wing sail and the side walls 221 or 222 of the flaps face the body of the vessel 3, as shown in Figures 4 and 10. Alternatively, the tilting device may be positioned such that the leading edge 117 or trailing edge 118 of the main wing sail 110 and the leading edge 127 or trailing edge 128 of the flap face the hull of the vessel 3, as shown in Figures 5b and 11b, thereby tilting the wing sail frame to a vertical upright position.This inclined vertical position IIIb is shown in enlargement in Figures 5b and 11b, and in the view from the bottom of the wing sail frame 101 in Figures 5c and 11c, the longitudinal axis L of the wing sail frame 101 is approximately parallel to the horizontal length H of the ship's hull 3. The transverse axis T of the wing sail frame 101 is parallel to the vertical axis V with respect to the horizontal length of the ship's hull 3. In this third vertical inclined position (IIIb), the wing sail structure 100 can further reduce the footprint on the ship's deck, which is a significant advantage. The vertical inclined position (IIIb) can also be obtained by rotating the inclined wing sail structure 101 from the horizontal inclined position (IIIa) shown in Figure 4 to the vertical inclined position (IIIb). Another modification is to arrange the wing sail structure with means to rotate the wing sail frame around its longitudinal axis (l) while inclined. Alternatively, the wing sail frame can be rotated from a horizontal to a vertical stowed position, or vice versa, when tilted.

[0048] In Figures 4, 5a-5c, 10, and 11a-11c, which show the vertical inclination position (IIIb), it should be noted that the base is separated from the shaft 22 by the illustrated means. However, it is clear that the base 20 and the shaft 22 can be connected to each other even when inclined, for example via the inclination means 310, as is the case when using the aforementioned inclination device 300. Furthermore, or instead, other connecting means or additional rotating means may be used.

[0049] Returning to Figures 1a, 1b, 2a, and 2b, embodiments of the wing sail frame according to the present invention, comprising an upper connecting member 130 and a lower connecting member 140, are shown in more detail. In the illustrated embodiments, each of the upper connecting member 130 and the lower connecting member 140 is configured to provide a second pivot axis 112 for rotating the flap 120 relative to the upper connecting member 130 and the lower connecting member 140. In the illustrated embodiments, the upper connecting member 130 and the lower connecting member 140 are further configured to provide a third pivot axis 113 for rotating the main wing sail 110 relative to the upper connecting member 130 and the lower connecting member 140. Furthermore, the upper connecting member 130 and the lower connecting member 140 are connected to the upper ends 115, 125 and lower ends 116, 126 of the main wing sail 110 and the flap 120, respectively. The lower connecting member is configured to provide a first pivot axis 111 for rotating the wing sail frame 101 relative to the base 20. The first rotation axis 111 is offset from the third rotation axis 113 for rotating the main wing sail 110. The first rotation axis 111 is positioned between the third rotation axis 113 and the second rotation axis 112. The first, second, and third rotation axes each extend in the longitudinal direction L of the wing sail frame 101. Known commercially available means for providing the rotation axes, such as commercially available shafts and bearings, may be used. By having the first rotation axis 111, the second rotation axis 112, and the third rotation axis 113 as independent rotation axes, loads can be transmitted from the wing sail profile to the ship interface.

[0050] The upper and lower connecting members 130 and 140 have substantially similar shapes and extend from a point near the third pivot axis 113, located near the leading edge 117 of the main wing sail 110, to a point near the second pivot axis 112, located near the leading edge 127 of the flap 120. The shape of the connecting members may resemble an airfoil or have another shape that conforms to the lateral length T and depth D of the connecting members, thereby tapering in the direction from the main wing sail to the flap. By providing three separate pivot axes associated with the upper and lower connecting members, a robust connection between the main wing sail and the flap is obtained, while simultaneously allowing for flexible fine adjustments such as camber provided by the wing sail frame.

[0051] Here, we refer to another embodiment of the wing sail frame shown in Figures 6 to 11c. Similar to Figure 1a, a vessel 1 equipped with a wind-assisted propulsion system 10 having three wing sail structures 100 is shown. Each wing sail structure 100 comprises a wing sail frame 101, which is shown in more detail from above in Figures 7a, 7b, and 7c. The main wing sail 110 and flaps 120 are rigid or semi-rigid, meaning they have some degree of flexibility, similar to the main wing sail and flaps already described in relation to Figures 1a to 2b, for which the above description is referred.

[0052] The wing sail frame 101 in the embodiments shown in Figures 6 to 10 differs from the wing sail frame 101 in Figures 1a to 2b in terms of the shape and function of the upper connecting member 130 and the lower connecting member 140, which are configured to rotatably connect the main wing sail 110 and the flap 120 to each other. In the embodiments shown in Figures 6 to 10c, the upper connecting member 130 and the lower connecting member 140 are configured to have a second rotation axis 112 for rotating the flap 120 relative to the upper connecting member 130 and the lower connecting member 140, as well as a fourth rotation axis 114 for rotating the flap 120 relative to the main wing sail 110.

[0053] The fourth rotation axis 114 is associated with the main wing sail 110, allowing the flap 120 to rotate relative to the main wing sail 110. At the same time, the upper connecting member 130 and the lower connecting member 140 do not necessarily have to be configured to provide a first rotation axis 111 for rotating the wing sail frame relative to the base. Instead, the first rotation axis 111 is associated with a shaft 22 connected to the lower end 116 of the main wing sail 110 in relation to a rotating device 200, as shown, for example, in Figures 5b, 5c, 11b, 11c, and 12. Thus, when the main wing sail 110 rotates around the first rotation axis, the entire wing sail frame rotates. In this embodiment, the connecting members 130 and 140 may include link arms that are rotatable around a second rotation axis 112 and a fourth rotation axis 114.

[0054] Figure 7a shows a top view of the wing sail structure 100 when the wing sail frame is positioned in a first deployed thrust upright position (I). As can be seen from the figure, the main wing sail 110 and the flap form a convex arc-shaped camber to provide the desired thrust. The flap 120 can rotate toward the main wing sail 120 from the first deployed upright position (I) with respect to a second vertical rotation axis 112, as indicated by the arrow R in Figure 7a, to a second folded upright position (IIa) shown in Figure 7b. In this second folded position (IIa), the right side wall 222 of the flap 120 is folded toward the right side wall 212 of the main wing sail 110, but the flap 120 can be folded in the opposite direction such that the side wall 221 of the flap 120 is folded toward the side wall 211 of the main wing sail 110.

[0055] Figure 7c shows a further deformation of the fold obtained by the fourth rotation axis 114 provided on the upper connecting member 130 and the lower connecting member 140. The flap 120 can also be rotated counterclockwise (or clockwise) from the first unfolded upright position (I) around the second vertical rotation axis 112, compared to the clockwise direction indicated by arrow R in Figure 7a. At the same time, the upper connecting means 130 and the lower connecting means 140 are rotated clockwise with respect to the fourth rotation axis 114, and the flap is rotated so that the side wall 221 faces the side wall 212 of the main wing sail. Also, the trailing edges 117, 127 of the main wing sail and the flap 117 are positioned close to each other. In this second folded position (IIb), the flap 120 faces the same direction as the main wing sail 110. In this second folding position (IIb), the lateral length T of the wing sail frame 101 may be further reduced compared to the second folding position (IIa).

[0056] "Same direction" means that the main alignment of the main wing sail and flaps, i.e., the leading edge and trailing edge, are primarily facing in directions of 90 degrees or less.

[0057] Herein, we refer to further embodiments of the wing sail frame shown in Figures 8a to 8c. In a manner similar to that related to Figure 1a, the wing sail structure 100 comprises a wing sail frame 101 including a rigid or semi-rigid main wing sail 110 and flaps 120, similar to the main wing sail and flaps already described in relation to Figures 1a to 2b, for which please refer to the above description.

[0058] The wing sail frame 101 in the embodiments shown in Figures 6 to 10c differs from that in Figures 1a to 2b mainly in the shape and function of the upper connecting member 130 and the lower connecting member 140, which are configured to rotatably connect the main wing sail 110 and the flap 120 to each other. In the embodiments of Figures 6 and 7a to 7c, the upper connecting member 130 and the lower connecting member 140 are configured to have a second rotation axis 112 for rotating the flap relative to the upper connecting member 130 and the lower connecting member 140, as well as a fourth rotation axis 114 for rotating the flap 120 relative to the main wing sail 110.

[0059] Referring to the embodiments shown in Figures 7a to 7c, the upper connecting member 130 and the lower connecting member 140 are attached to the upper ends 115, 125 of the main wing sail 110 and the flap 120, respectively, and to the lower ends 116, 126 of the main wing 110 and the flap 120, respectively. The connecting member extends between a second pivot axis 112 associated with the flap 120 and a fourth pivot axis 114 associated with the main wing sail 110. By connecting the connecting member to the second pivot axis 112 and the fourth pivot axis 114, rotation of the flap 120 around the main wing sail 110 is made possible. At the same time, the upper connecting member 130 and the lower connecting member 140 are not configured to provide a first pivot axis 111 for rotation of the wing sail frame 101 relative to the base. Instead, the first rotation axis 111 is associated with the lower end 116 of the main wing sail 110, as shown, for example, in relation to the rotating device 200 in Figure 12. Thus, when the main wing sail 110 rotates around the first rotation axis 111, the entire wing sail frame 101 rotates. In the embodiments of Figures 7a to 7c, the connecting members 130 and 140 consist of link arms, which are configured to be rotatable around the second rotation axis 112 and the fourth rotation axis 114, and may be connected to the second rotation axis 112 and the fourth rotation axis 114.

[0060] Referring to the embodiments shown in Figures 8a to 8c, the upper connecting member 130 and the lower connecting member 140 are attached to the trailing edge 118 of the main wing sail and the leading edge of the flap 120. The upper connecting member 130 and the lower connecting member 140 are attached to the lower ends 116 and 126 of the main wing sail 110 and the flap 120, respectively, at a certain distance from their respective upper ends 115 and 125. An additional connecting member 150 is attached between the upper connecting member 130 and the lower connecting member 140, and it should be noted that multiple additional connecting members may be used between the upper connecting member 130 and the lower connecting member 140. The connecting members 130, 140, and 150 extend between the second pivot axis 112 associated with the flap 120 and the fourth pivot axis 114 associated with the main wing sail 110. To facilitate the folding of the flap 120 to the second folded position (IIa), the connecting members 130, 140, and 150 may have a curved link arm shape. The link arms are attached to recesses in the main wing sail and the flap, respectively, and can be attached by appropriate means to the side walls 211, 212, 221, and 222 of the main wing sail and the flap. In this modification, the connecting members 130, 140, and 150 are not configured to provide a first pivot axis 111 for rotating the wing sail frame 101 relative to the base. Instead, the first pivot axis 111 is associated with the lower end 116 of the main wing sail 110, for example, as shown in relation to the rotating device 200 in Figure 12. Thus, when the main wing sail 110 is rotated around the first pivot axis 111, the entire wing sail frame 101 is rotated.

[0061] The wind-powered propulsion device 10 may be operated in the following manner: that is, by controlling the rotation angles of the wing sail frame 101, the main wing sail 110, and / or the flap 120 to create camber in a first upright propulsion position (I); by folding the flap toward the main wing sail to a second folded upright position (IIa, IIb); and by tilting the wing sail frame (101) toward the hull of the vessel to a third inclined position (IIIa, IIIb). The wing sail frame is raised from the inclined position to the upright position when propulsion is needed or required.

[0062] The detailed description and drawings are intended to facilitate understanding of embodiments of the present invention and do not limit the scope of the invention. The scope of the invention is limited by the appended claims. [Explanation of Symbols]

[0063] 1 ship 3 Main unit 10 Wind-assisted propulsion system 20 Foundation 22 shafts 24 Top 100 Wing Sail Construction 101 Wing Sail Frame 110 Main Wing Sail 111 First axis of rotation 112 Second axis of rotation 113 Third axis of rotation 114. Fourth axis of rotation 115 Top 116 Bottom end 117 Leading edge 118 Trailing edge 120 Flap 127 Leading edge 128 Trailing edge 130 Upper connecting member 140 Lower connecting member 200 Rotation Device 210 Drive unit 211, 212, 221, 222 side wall 240 Housing 300 Tilt device 310 Tilting means 312 Locking mechanism 330 Moment Shaft D Depth L Vertical axis R arrow RT rotation axis T width V vertical axis

Claims

1. A wing sail structure (100) for a wind-powered propulsion system (10) of a ship (1), A rigid or semi-rigid main wing sail (110) having an airfoil shape with a leading edge, trailing edge, upper end (115) and lower end (116), with side walls (211; 212) extending between them, A rigid or semi-rigid flap (120) having an airfoil shape with a leading edge, trailing edge, upper end (125) and lower end (126), and side walls (221; 222) extending between them, The main wing sail and the flap are connected by at least one upper connecting member (130) and at least one lower connecting member (140), A wing sail frame (101) equipped with, A base (20) positioned to be fixed to the main body (3) of a vessel (1), the base (20) being associated with the wing sail frame, the wing sail frame being rotatable relative to the base via a first vertical rotation axis (111) A wing sail structure (100) comprising the following: The upper connecting member (130) and the lower connecting member (140) are Move the main wing sail and the flaps to the first deployed and raised position (I). The main wing sail and the flap are configured to move closer to each other to a second folded-up position (IIa; IIb), The wing sail structure (101) further includes a tilting device (300) configured to move the wing sail frame (101) from the second folded upright position (IIa; IIb) to a third inclined position (IIIa; IIIb) relative to the base, The third inclined position (IIIa; IIIb) includes a third inclined horizontal storage position (IIIa) and a third inclined vertical storage position (IIIb), The tilting device (300) is configured to allow the wing sail frame (101) to be rotated from the third tilted horizontal storage position (IIIa) to the third tilted vertical storage position (IIIb), or vice versa, in the wing sail structure (100).

2. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and the lower connecting member (140) are configured to have a second rotation axis (112) for rotating the flap (120) relative to the upper connecting member (130) and the lower connecting member (140).

3. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and the lower connecting member (140) are configured to have a third rotation axis (113) for rotating the main wing sail (110) relative to the upper connecting member (130) and the lower connecting member (140).

4. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and the lower connecting member (140) are connected to the upper ends (115; 125) and lower ends (116; 126) of the corresponding main wing sail and flap, respectively, and the lower connecting member is configured to provide a first pivot axis (111) for rotating the wing sail frame (101) relative to the base (20).

5. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and the lower connecting member (140) are configured to provide a fourth rotation axis (114) associated with the main wing sail (110) for rotating the flap (120) relative to the main wing sail (110).

6. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and the lower connecting member (140) are connected to the upper ends (115; 125) and lower ends (116; 126) of the corresponding main wing sail and the flap, respectively.

7. The wing sail structure (100) according to claim 1, wherein the upper connecting member (130) and / or the lower connecting member (140) are connected at a certain distance from the corresponding upper end (115; 125) and lower end (116; 126), respectively.

8. The wing sail structure (100) according to claim 1, wherein in the third inclined horizontal storage position (IIIa), the wing sail frame (101) is positioned horizontally such that the side walls (211, 212; 221, 222) extending between the leading edge (117; 127) and trailing edge (118; 128) of the corresponding main wing (110) and the flap (120) face the body of the ship.

9. The wing sail structure (100) according to claim 1, wherein in the third inclined vertical storage position (IIIb), the wing sail frame (101) is positioned vertically such that the leading edge (117) or trailing edge (118) of the main wing sail (110) faces the body (3) of the vessel (1), and the trailing edge (128) or leading edge (127) of the flap (120) faces the body of the vessel.

10. The wing sail structure (100) according to claim 1, wherein the main wing sail and the flap are each composed of one or more semi-rigid or rigid modules detachably connected to one another, forming an integrated main wing sail or flap having an airfoil shape.

11. A wind-powered propulsion device (10) comprising at least one wing sail structure (100) according to any one of claims 1 to 10.

12. A ship (1) equipped with a wind-powered propulsion device (10) as described in claim 11.

13. A method for operating at least one wing sail structure (100) according to any one of claims 1 to 10 in a wind-powered propulsion device (10), - A step of controlling the rotation angle of the wing sail frame (101), main wing sail, and / or flap (120) in the first upright thrust position (I) to provide camber, - The steps of folding the flap (120) toward the main wing sail to form a second folded upright position (IIa; IIb), - The step of tilting the wing sail frame (101) toward the main body of the ship to form a third inclined position (IIIa; IIIb), A method that includes this.

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