Wind propulsion system and marine vessel

Abstract

The present disclosure relates to a wind power propulsion system (4) comprising a wind power engagement unit (6), a first hydraulic actuator (8) arranged to generate a first tilting force for tilting the wind power engagement unit, and a main hydraulic control assembly (10) for controlling the first hydraulic actuator. A bypass assembly (30) is connected to the second pressure chamber (28) of the actuator (8). The bypass assembly is decoupled from the main hydraulic control assembly. The wind propulsion system is configured to tilt the wind engagement unit with a second tilt force generated independently of the main hydraulic control assembly. The bypass assembly (30) is configured to direct hydraulic fluid from the second pressure chamber (28) when the wind engagement unit is tilted with the second tilting force.

Description

TECHNICAL FIELD

[0001] The present invention relates to a wind propulsion system and to a marine vessel. BACKGROUND

[0002] Sails as a means for propelling a vessel have been known for a long time. Traditionally, a flexible sail made of fabric is mounted on a mast to harness wind power and propel the vessel.

[0003] Modern marine vessels are commonly propelled using fossil fuels and internal combustion engines. It has been suggested to use wind propulsion to reduce the overall consumption of fossil fuels. For this purpose, one or more wind engaging units can be used. In addition to the commonly known flexible sheet formed sails, such wind engaging units can also comprise various types of rigid or flexible sails, such as wing sails, rotor sails, wind turbines or similar.

[0004] The amount of propulsion power generated by a wind engaging unit is related to a number of interrelated factors, but the wind engaging area of the wind engaging unit, i.e. the area of the wind engaging unit that engages wind power and thus is exposed to wind loads in a way that provides propulsion to the vessel, as well as other geometrical and aerodynamic properties are the main performance indicators.

[0005] For the purpose of controlling the generated propulsion power, one or more aspects of the wind engaging unit can be controllable. Some wind engaging units can be controllable between an active position or an inactive position. In the active position, the wind engaging unit generates propulsion power. In the inactive position of the wind engaging unit, no or at least substantially reduced propulsion power is generated.

[0006] For example, wind engaging units comprising various types of rigid or rotor sails can be tilted from an upright position. In the upright position, the wind engaging unit can be in the active position and when fully tilted the wind engaging unit is in its inactive position.

[0007] A control assembly comprising actuators, e.g. hydraulic driven, can be arranged for controlling aspects of the wind engaging unit, including its tilting. SUMMARY

[0008] On some marine vessels, safety measures can be taken that can require tilting of the wind engaging units of the wind propulsion system. For example, strong winds can require the wind engaging units to be placed in their tilted inactive position to ensure safe navigation of the marine vessel. Bridge passage can also require tilting of the wind engaging units.

[0009] It would be advantageous to implement a wind propulsion system comprising a wind engaging unit which ensures tilting of the wind engaging unit. It would especially be desirable to enable tilting of the wind engaging unit of the wind propulsion system even if a main control assembly of the wind propulsion system fails. To better address one or more of the concerns discussed above, one or more of a wind propulsion system and a marine vessel having features as defined in one or more of the independent claims are provided.

[0010] According to an aspect, there is provided a wind propulsion system comprising a wind engaging unit, a first hydraulic actuator arranged to generate a first tilting force for tilting the wind engaging unit, and a main hydraulic control assembly for controlling the first hydraulic actuator. The first hydraulic actuator comprises a first pressure chamber for receiving hydraulic fluid to generate the first tilting force and a second pressure chamber for receiving hydraulic fluid to generate a force opposite the first tilting force. The main hydraulic control assembly is configured to direct hydraulic fluid to and from the first and second pressure chambers. The wind propulsion system further comprises a bypass assembly connected to the second pressure chamber, the bypass assembly being separate from the main hydraulic control assembly. The wind propulsion system is configured to tilt the wind engaging unit with a second tilting force generated independently of the main hydraulic control assembly. The bypass assembly is configured to direct hydraulic fluid from the second pressure chamber when the wind engaging unit is tilted with the second tilting force.

[0011] Since the wind propulsion system comprises a bypass assembly connected to the second pressure chamber, since the bypass assembly is separate from the main hydraulic control assembly, since the wind propulsion system is configured to tilt the wind engaging unit with a second tilting force generated independently of the main hydraulic control assembly, and since the bypass assembly is configured to direct hydraulic fluid from the second pressure chamber when the wind engaging unit is tilted with the second tilting force, the wind engaging unit can be tilted independently of the main hydraulic control assembly. Thus, the wind engaging unit can be tilted even if the main hydraulic control assembly fails.

[0012] More specifically, since the bypass assembly is separate from the main hydraulic control assembly and configured to direct hydraulic fluid from the second pressure chamber, if the main hydraulic control assembly fails, hydraulic fluid can be directed from the second pressure chamber when the second tilting force is used to tilt the wind engaging unit. Thus, the main hydraulic control assembly does not need to direct hydraulic fluid from the second pressure chamber.

[0013] According to another aspect, there is provided a marine vessel comprising a wind propulsion system according to any aspect and / or embodiment discussed herein.

[0014] Thus, as discussed above, the wind engaging unit of the wind propulsion system comprised in the marine vessel can be tilted even if the main hydraulic control assembly fails.

[0015] The wind propulsion system is configured to at least contribute to the propulsion of a marine vessel on which the wind propulsion system is mounted. The marine vessel, herein alternatively referred to as the vessel, can typically be a vessel used in the sea-borne transport of goods and / or passengers. However, the marine vessel can alternatively be a recreational yacht.

[0016] The wind propulsion system can herein alternatively be referred to as a propulsion system.

[0017] As mentioned above, the wind propulsion system comprises a wind engaging unit, i.e. a unit adapted to engage with wind for propelling the marine vessel.

[0018] According to embodiments, the wind engaging unit can comprise or consist of a wing sail, a rotor sail, a turbine sail or similar. That is, the wind engaging unit is a kind of unit that in itself comprises one or more rigid members, such as a support structure, a mast and / or a sail, and which in certain cases can need to be tilted.

[0019] The first hydraulic actuator is arranged to tilt the wind engaging unit under control of the primary first hydraulic actuator. In a fully tilted position, the wind engaging unit is inactive and does not contribute or only to a limited extent contributes to the propulsion of the vessel. The first hydraulic actuator can also be arranged to lift the wind engaging unit to an upright position. In the upright position, the wind engaging unit can be active and contribute to the propulsion of the vessel, and some wind engaging units can also be inactive when upright by being arranged in a non-propelling configuration. This is possible, for example, for wing sails.

[0020] When hydraulic fluid is directed by the primary hydraulic control assembly to the first pressure chamber of the first hydraulic actuator, the first hydraulic actuator generates a first tilting force.

[0021] The force opposite to the first tilting force can be a force for lifting the wind engaging unit. Thus, when hydraulic fluid is directed by the primary hydraulic control assembly to the second pressure chamber of the first hydraulic actuator, the first hydraulic actuator generates a force opposite to the first tilting force, i.e. a force for lifting the wind engaging unit.

[0022] The wind propulsion system can comprise more than one first hydraulic actuator for tilting and lifting the wind engaging unit.

[0023] As mentioned above, the primary hydraulic control assembly is configured to direct hydraulic fluid to and from the first and second pressure chambers. This means that the primary hydraulic control assembly can comprise one or more of a hydraulic pump, a flow control valve, control logic, etc.

[0024] Under normal operating conditions, the primary hydraulic control assembly enables tilting and lifting of the wind engaging unit.

[0025] The main hydraulic control unit may include a user interface or be able to communicate with a user interface. Personnel on the marine vessel may provide input to the main hydraulic control unit via the user interface to tilt and raise the wind-powered engagement unit.

[0026] The main hydraulic control unit can control the wind-powered engagement unit and / or other aspects of the wind-powered propulsion system.

[0027] The separation of the bypass assembly from the main hydraulic control assembly means that hydraulic fluid can be directed from the second pressure chamber through it independently of the main hydraulic control assembly. In other words, the flow of hydraulic fluid through the bypass assembly is independent of the main hydraulic control assembly. The main hydraulic control assembly does not control the flow of hydraulic fluid through the bypass assembly. The bypass assembly may be included in the same equipment frame as the main hydraulic control assembly, but has separate components, fittings, and / or controls.

[0028] Therefore, in the event of a failure in the main hydraulic control assembly, the hydraulic fluid can still be diverted from the second pressure chamber via the bypass assembly, allowing the wind turbine unit to tilt using the second tilting force. That is, to tilt the wind turbine unit, the hydraulic fluid in the second pressure chamber of the first hydraulic actuator must be drawn out from it.

[0029] One or more hydraulic fluid conduits may be shared by the bypass assembly and the main hydraulic control assembly, but the hydraulic fluid flow control device of the bypass assembly is separate from the hydraulic fluid flow control device of the main hydraulic control assembly.

[0030] As mentioned above, the second tilting force is generated independently of the main hydraulic control assembly. For example, the second tilting force may include force components generated by natural forces (such as gravity), aerodynamic forces (such as forces caused by wind or headwinds), ship movement caused by waves, etc. The second tilting force may include force components generated hydraulically or mechanically, such as by a hydraulic pump separate from the main hydraulic control assembly, by hydraulic or mechanical jacks, or by a winch.

[0031] Therefore, in some embodiments, the second tilting force can be generated independently of the first hydraulic actuator. In other embodiments, the second tilting force can be generated at least partially by the first hydraulic actuator, but still independently of the main hydraulic control assembly.

[0032] In addition to being tiltable, the wind-powered coupling unit or at least a portion thereof is movable. For example, the wind propulsion system may include a base and the wind-powered coupling unit or a portion thereof may be displaced relative to the base. For example, the wind-powered coupling unit or its movable portion may be displaced relative to the base to control the direction and / or amplitude of the propulsive force generated by the wind-powered coupling unit. Such displacement relative to the base may also be controlled by a main hydraulic control assembly.

[0033] The wind-powered coupling unit may include a wing sail, wherein the wing sail may include a main wing sail with an airfoil shape and flaps with airfoil shapes. Optionally, the wing sail may have more than one flap.

[0034] In such an embodiment, a first hydraulic actuator controls the tilt of the entire wing sail.

[0035] A second hydraulic actuator can be provided to control the position of the flaps relative to the main wing sail. This second hydraulic actuator can be controlled by the main hydraulic control unit.

[0036] Another such hydraulic actuator could be, for example, a hydraulic cylinder or a hydraulic motor.

[0037] Other features of the invention and its associated advantages will become apparent when examined in conjunction with the appended claims and the following detailed description. Attached Figure Description

[0039] Various aspects and / or embodiments of the invention, including their specific features and advantages, will be readily understood from the exemplary embodiments discussed in the following detailed description and accompanying drawings, wherein: Figure 1a and Figure 1b A marine vessel according to an embodiment is shown.

[0040] Figure 2 A portion of a wind propulsion system according to an embodiment is schematically shown, and Figures 3a-3d A schematic top view of the wind-powered junction unit is shown. Detailed Implementation

[0041] Various aspects and / or embodiments of the invention will now be described more fully. Similar figures throughout refer to similar elements. For the sake of brevity and / or clarity, well-known functions or structures will not be described in detail.

[0042] Figure 1a and Figure 1b A maritime vessel 2 according to an embodiment is shown. Figure 1b The bow end of vessel 2 is shown in the image.

[0043] Ocean vessel 2 includes a wind propulsion system 4 according to any aspect and / or embodiment discussed herein, with particular reference to Figure 2 -4.

[0044] The vessel 2 may include more than one wind propulsion system. In the illustrated embodiment, the vessel 2 includes three wind propulsion systems 4, 4', 4'". The wind propulsion systems 4, 4', 4'' may be of similar or different types.

[0045] Vessel 2 may include fewer than three wind propulsion systems, such as one or two wind propulsion systems, or more than three wind propulsion systems, such as in the range of 4 to 12.

[0046] The wind propulsion system 4 includes a wind-powered engagement unit 6 and a first hydraulic actuator 8 (see...). Figure 1b The system includes a main hydraulic control assembly 10 for controlling the first hydraulic actuator 8. The first hydraulic actuator 8 is arranged to generate a first tilting force for tilting the wind-powered engagement unit 6. The first tilting force is generated by the first hydraulic actuator 8 under the control of the main hydraulic control assembly 10.

[0047] The wind-powered connection unit 6 is located on the deck structure of the ship 2.

[0048] Figure 1a and Figure 1b The main hydraulic control assembly 10 is schematically indicated in the diagram. See below for reference. Figure 2 Let’s discuss the first hydraulic actuator 8 and the main hydraulic control assembly 10 in more detail.

[0049] exist Figure 1a The wind-powered engagement unit 6 is shown in an upright or raised position. The upright or raised position of the wind-powered engagement unit 6 can be an active position in which the wind-powered engagement unit 6 is positioned to facilitate the propulsion of the marine vessel 2. According to some embodiments, the wind-powered engagement unit 6 can also be arranged in a non-active position in the upright position, i.e., not facilitating the propulsion of the vessel 2.

[0050] exist Figure 1b In the diagram, the wind-powered engagement unit 6 is shown in an inclined position. The inclined position can be a generally horizontal position, or it can be a position generally parallel to an extension of the ship's hull or deck. The inclined position of the wind-powered engagement unit 6 is an inactive position in which the wind-powered engagement unit 6 does not contribute to the propulsion of the ship 2, at least not to any significant extent.

[0051] The approximate horizontal position can be such that, when viewed from the vertical plane extending between the bow and stern of the vessel 2, the longitudinal axis L of the wind-powered coupling unit 6 is arranged at an angle within the range of + / -15 degrees to the waterline W of the vessel 2.

[0052] The wind propulsion system 4 is configured to tilt the wind-powered coupling unit 6 using a second tilting force generated independently of the main hydraulic control component 10.

[0053] In the illustrated embodiment, the wind-engaging unit 6 is a wing sail 6'. However, according to an alternative embodiment, the wind-engaging unit 6 may be a rotor sail, turbine sail, or similar device, which includes one or more rigid members that can be tilted by a first hydraulic actuator.

[0054] Rotary sails can utilize the so-called Magnus effect and may include, for example, Fletterer rotors. Turbosails are sometimes referred to as suction sails. Other similar devices may include, for example, wind turbines.

[0055] The wing sail 6' includes a main wing sail 12 with an airfoil shape and flaps 14 with an airfoil shape.

[0056] Therefore, in some embodiments, such as those shown, the wind-powered assembly unit 6 may include a main component 12 and an auxiliary component 14. The wind-powered propulsion system 4 includes a second hydraulic actuator, as described in the references below. Figure 2 It is arranged to generate a first moving force to move the auxiliary component 14 relative to the main component 12.

[0057] The main hydraulic control assembly 10 is arranged to control a second hydraulic actuator. For example, the main hydraulic control assembly 10 is configured to control the second hydraulic actuator to generate a first moving force.

[0058] The wind propulsion system 4 is configured to move the auxiliary component 14 relative to the main component 12 using a second moving force generated independently of the main hydraulic control component 10.

[0059] The first hydraulic actuator 8 controls the tilting of the entire wing sail 6', including the main component / main wing sail 12 and the auxiliary component / flaps 14.

[0060] Figure 2 A portion of the wind propulsion system 4 according to an embodiment is shown schematically.

[0061] Figure 2 The wind propulsion system 4 in the embodiment and Figure 1a and Figure 1b The wind propulsion system 4 in the embodiment is very similar. Therefore, reference is also made to... Figure 1a and Figure 1b The above discussion of the embodiments.

[0062] Furthermore, propulsion system 4 can be included in ocean-going vessels.

[0063] Furthermore, the wind propulsion system 4 includes a wind engagement unit 6, a first hydraulic actuator 8, and a main hydraulic control assembly 10 for controlling the first hydraulic actuator 8. The first hydraulic actuator 8 is arranged to generate a first tilting force for tilting the wind engagement unit 6 under the control of the main hydraulic control assembly 10.

[0064] The first hydraulic actuator 8 can be a hydraulic cylinder. Therefore, a tilting system (which includes a hydraulic actuator) for tilting the wind-powered unit is known. Therefore, other components of the tilting system need not be discussed in detail herein.

[0065] Furthermore, the wind propulsion system 4 is configured to tilt the wind-powered coupling unit 6 using a second tilting force generated independently of the main hydraulic control assembly 10.

[0066] Furthermore, the wind-powered coupling unit 6 includes a main component 12, an auxiliary component 14, and a second hydraulic actuator 18, which, under the control of the main hydraulic control assembly 10, generates a first moving force for moving the auxiliary component 14 relative to the main component 12.

[0067] The supply box 16 is used to receive and supply hydraulic fluid to the hydraulic components of the propulsion system 4.

[0068] The main hydraulic control assembly 10 includes various hydraulic components, such as at least one hydraulic pump, valves for controlling the arrival and departure of hydraulic fluid from the first and second hydraulic actuators 8, 18, and electronic control logic 20 for controlling the various hydraulic components.

[0069] A hydraulic pump pressurizes hydraulic fluid (such as hydraulic oil), which, under the control of a valve, is guided to and from the first and second hydraulic actuators 8, 18 via the main hydraulic control assembly 10.

[0070] Valves used to control the flow of hydraulic fluid may include so-called anti-balance valves 21, 23, 24, 25 or other corresponding load-holding hydraulic components configured to maintain back pressure at the hydraulic fluid lines leading to and away from the first and second actuators 8, 18 to prevent loss of control over the load on the hydraulic actuators, i.e., to maintain the set position of the wind-powered engagement unit 6 and / or auxiliary component 14 during the use of the propulsion system 4.

[0071] Electronic control logic 20 includes one or more computing units, which may take the form of virtually any suitable type of processor circuitry or microcomputer, such as circuitry for digital signal processing (digital signal processor, DSP), central processing unit (CPU), processing unit, processing circuitry, processor, application-specific integrated circuit (ASIC), microprocessor, or other processing logic capable of interpreting and executing instructions. The term "computing unit" as used herein may represent a processing circuitry system comprising multiple processing circuits, such as any, some, or all of those mentioned above. Electronic control logic 20 may include storage units. Computing units are connected to storage units, which, for example, provide the computing units with stored program code and / or stored data necessary for them to perform calculations. Computing units may also be adapted to store portions or final results of calculations in the storage units. Storage units may include physical means for temporarily or permanently storing data or programs (i.e., sequences of instructions).

[0072] Electronic control logic 20 is specifically connected (not shown) to valves for controlling the flow of hydraulic fluid to and from the first and second hydraulic actuators 8, 18. Electronic control logic 20 may include or communicate with a user interface 22. User interface 22 may be located on the bridge of an ocean-going vessel for crew control of the wind propulsion system 4. Electronic control logic 20 and / or user interface 22 may be connected to remote control via satellite, mobile network, or internet connection.

[0073] More specifically, the first hydraulic actuator 8 includes a first pressure chamber 26 for receiving hydraulic fluid to generate a first tilting force and a second pressure chamber 28 for receiving hydraulic fluid to generate a force opposite to the first tilting force. The main hydraulic control assembly 10 is configured to guide hydraulic fluid to and from the first and second pressure chambers 26, 28.

[0074] The direction of the first tilting force is indicated by a broad arrow at the first hydraulic actuator 8. According to some embodiments, the second tilting force is also in the direction of the broad arrow.

[0075] When applied, each of the first and second tilting forces causes the wind-powered coupling unit 6 to tilt. To tilt the wind-powered coupling unit 6, hydraulic fluid must be released from the second pressure chamber 28.

[0076] When the first tilting force is generated by the first hydraulic actuator 8 under the control of the main hydraulic control assembly 10, the main hydraulic control assembly 10 also controls the associated anti-balance valve 23 to allow hydraulic fluid to leave the second pressure chamber 28, either directly or indirectly by initiating a pressure differential, depending on the type of anti-balance valve.

[0077] The wind propulsion system 4 also includes a bypass assembly 30 connected to the second pressure chamber 28. The bypass assembly 30 is separate from the main hydraulic control assembly 10.

[0078] Specifically, the bypass assembly 30 at least bypasses the counterbalance valve 23 or other load-holding hydraulic assembly of the main hydraulic control assembly 10 connected to the second pressure chamber 28.

[0079] The bypass assembly 30 is configured to guide hydraulic fluid from the second pressure chamber 28 when the wind-powered engagement unit 6 is tilted by a second tilting force generated independently of the main hydraulic control assembly 10.

[0080] The wind propulsion system 4 may include an additional hydraulic tilt actuator for tilting the wind-powered engagement unit 6. Such an additional hydraulic tilt actuator may be controlled in a manner similar to that discussed herein with reference to the first hydraulic actuator 8.

[0081] In contrast to the illustrated embodiment, an alternative first hydraulic actuator may extend to tilt the wind turbine unit and retract to raise the wind turbine unit 6. In such an embodiment, the bypass assembly 30 will function accordingly.

[0082] According to some embodiments, such as the one shown, the bypass assembly 30 includes a hydraulic passage 32 connecting the second pressure chamber 28 to a tank 16 for hydraulic fluid, and a controllable valve 34 disposed in the hydraulic passage 32, wherein the controllable valve 34 is configured to close and open the hydraulic passage 32. In this way, the bypass assembly 30 can be configured to guide hydraulic fluid from the second pressure chamber 28 when the wind-powered engagement unit 6 is tilted using a second tilting force.

[0083] The controllable valve 34 can be controlled independently of the main hydraulic control assembly 10.

[0084] The controllable valve 34 can be manually controlled, for example by turning a lever or a knob. Alternatively, as shown, the controllable valve 34 can be controlled via an autonomous control assembly 36. The autonomous control assembly 36 can operate on an emergency power source, such as a battery or a generator that provides power independently. Thus, a person can operate the autonomous control assembly 36 to tilt the wind-powered engagement unit 6.

[0085] In addition, the controllable valve 34 is adjustable between a closed and an open position, for example, to control the flow of hydraulic fluid through the hydraulic passage 32.

[0086] Since the wind propulsion system 4 is configured to tilt the wind coupling unit 6 using a second tilting force independent of the main hydraulic control component 10, the hydraulic pump of the main hydraulic control component 10 does not need to tilt the wind coupling unit 6 in case the main hydraulic control component 10 malfunctions.

[0087] According to some embodiments, such as the one shown, the hydraulic passage 32 includes or forms a flow restrictor 38 that limits the maximum flow rate of hydraulic fluid through the hydraulic passage 32, such that the hydraulic pressure in the second pressure chamber 28 generates a hydraulic pressure opposite to the second tilting force to limit the tilting speed of the wind-powered engagement unit 6. In this way, the wind-powered engagement unit 6 is prevented from tilting at an uncontrollable speed, although the tilting is not controlled by the main hydraulic control assembly 10, in case the latter malfunctions.

[0088] In other words, the speed at which the wind-powered coupling unit 6 tilts under the influence of the second tilting force is limited.

[0089] One or more hydraulic fluid lines or pipes may be shared by the bypass assembly 30 and the main hydraulic control assembly 10, but the hydraulic fluid flow control devices (such as the controllable valve 34 and the flow restrictor 38) of the bypass assembly 30 are separate from the hydraulic fluid flow control devices (such as the anti-balance valve 23 and the hydraulic pump of the main hydraulic control assembly 10).

[0090] According to some embodiments, the second tilting force may include a component of gravity.

[0091] For example, once the tilting of the wind-powered unit 6 has been initiated and the center of gravity of the wind-powered unit 6 has pivoted past the pivot axis around which the wind-powered unit 6 is pivoted, gravity can be the force that tilts the wind-powered unit 6 to its inactive position.

[0092] Another alternative could be that the ship following the waves at sea will cause the center of gravity of the wind-powered coupling unit 6 to be positioned on the lateral side of the pivot axis of the wind-powered coupling unit 6, so that gravity will cause the wind-powered coupling unit 6 to tilt.

[0093] According to some embodiments, the second tilting force may include an aerodynamic component.

[0094] For example, wind blowing toward the wind-powered coupling unit 6 can exert a force on the wind-powered coupling unit 6, which will at least partially contribute to the tilting of the wind-powered coupling unit 6. For example, wind can induce the tilting of the wind-powered coupling unit 6, and after the initial tilting movement, gravity can also contribute to the tilting.

[0095] When the vessel is propelled by another propulsion device (such as an internal combustion engine driving a propeller), the wind blowing towards the wind-powered coupling unit 6 may be a headwind. Alternatively, the vessel may turn towards the real wind so that the real wind blows towards the wind-powered coupling unit 6. The headwind may also be referred to as the apparent wind, which is the wind actually experienced by the wind-powered coupling unit 6, and it is defined as the real wind plus the motion of the vessel 1 (speed, heading, roll, etc.).

[0096] Alternatively, the tilting movement of the wind-powered coupling unit 6 can be initiated by the overturning moment generated by the motion of the ship, i.e., the eccentric inertial force acting on the wind-powered coupling unit 6 due to the motion of the ship.

[0097] According to some embodiments, the wind propulsion system 4 may include a hydraulic pump 40 separate from the main hydraulic control assembly 10, wherein the hydraulic pump 40 is configured to supply hydraulic fluid to a first pressure chamber 26 for generating a second tilting force.

[0098] In this way, personnel can start a hydraulic pump 40 that is separate from the main hydraulic control assembly 10 to generate a second tilting force, for example, in case the main hydraulic control assembly 10 malfunctions.

[0099] According to some embodiments, such as the one shown, the wind-powered engagement unit 6 includes a main component 12 and an auxiliary component 14. The wind propulsion system 4 includes a second hydraulic actuator 18 arranged to generate a first motive force for moving the auxiliary component 14 relative to the main component 12. The second hydraulic actuator 18 includes a third pressure chamber 42 for receiving hydraulic fluid to generate the first motive force and a fourth pressure chamber 44 for receiving hydraulic fluid to generate a force opposite to the first motive force. A main hydraulic control assembly 10 is configured to guide hydraulic fluid to and from the third and fourth pressure chambers 42, 44. The wind propulsion system 4 also includes another bypass assembly 46 connected to the fourth pressure chamber 44, which is separate from the main hydraulic control assembly 10. The wind propulsion system 4 is configured to move the auxiliary component 14 relative to the main component 12 using a second motive force independent of the main hydraulic control assembly 10. The other bypass assembly 46 is configured to guide hydraulic fluid from the fourth pressure chamber 44 when the auxiliary component 14 is moved using the second motive force. In this manner, the auxiliary component 14 can be moved relative to the main component 12 independently of the main hydraulic control assembly 10. Therefore, even if the main hydraulic control assembly 10 fails, the auxiliary component 14 can still move relative to the main component 12.

[0100] When the first moving force is generated by the second hydraulic actuator 18 under the control of the main hydraulic control assembly 10, the main hydraulic control assembly 10 also controls the associated anti-balance valve 24 or other corresponding load-holding hydraulic assembly to discharge hydraulic fluid from the fourth pressure chamber 44.

[0101] The direction of the first moving force is indicated by a broad arrow at the second hydraulic actuator 18. According to some embodiments, the second moving force is also along the direction of the broad arrow.

[0102] Because the other bypass assembly 46 is separate from the main hydraulic control assembly 10 and configured to draw hydraulic fluid from the fourth pressure chamber 44, if the main hydraulic control assembly 10 fails, hydraulic fluid can be drawn from the fourth pressure chamber 44 when the second moving force is used to move the auxiliary component 14 relative to the main component 12. Therefore, the main hydraulic control assembly 10 does not need to draw hydraulic fluid from the fourth pressure chamber 44.

[0103] Specifically, another bypass component 46 bypasses at least the anti-balance valve 24 or other corresponding load-holding hydraulic components of the main hydraulic control component 10 connected to the fourth pressure chamber 44.

[0104] For example, if the wind-powered engagement unit 6 includes a wing sail 6', its flaps 14 can be folded against its main wing sail 12 to prepare the wing sail 6' for tilting. In more general terms, the auxiliary component 14 is movable relative to the main component 12. Such movement can be achieved by first and second moving forces. Under normal operating conditions, the first moving force is controlled by the main hydraulic control assembly 10. If the main hydraulic control assembly 10 fails, the second moving force is used to move the auxiliary component 14 relative to the main component 12.

[0105] According to some embodiments, the second moving force may include an aerodynamic component.

[0106] For example, wind blowing toward the auxiliary component 14 can apply a force to the auxiliary component 14, which will at least partially contribute to the folding of the auxiliary component against the main component 12. For example, wind can trigger the folding of the auxiliary component 14, and gravity can also contribute to the folding during the tilting movement of the entire wind-powered engagement unit 6, as further described below.

[0107] When the vessel is propelled by another propulsion device (such as an internal combustion engine driving a propeller), the wind blowing towards the wind-driven engagement unit 6 may be a headwind. Alternatively, the wind-driven engagement unit 6 as a whole can pivot about a vertical axis (not shown), allowing the aerodynamic component provided by the wind blowing at sea to be used to fold the auxiliary component 14 against the main component 12. Another alternative could be for the vessel to turn towards a real wind so that the real wind blows towards the auxiliary component 14 to fold it against the main component 12, for example.

[0108] The following is for reference. Figures 3a-3d See also how to use a second moving force, including aerodynamic force, to fold the auxiliary component 14 against the main component 12.

[0109] According to some embodiments, the second moving force may include a gravitational component.

[0110] For example, as the auxiliary component 14 is angled toward one side of the main component 12 (the auxiliary component 14 is configured to fold against that side), the partially or fully tilted position of the wind-powered coupling unit 6 will cause gravity to fold the auxiliary component 14 against the main component 12. That is, the center of gravity of the auxiliary component 14 will be located on the lateral side of the pivot axis around which the auxiliary component 14 pivots.

[0111] According to some embodiments, such as the one shown, another bypass assembly 46 includes another hydraulic passage 48 connecting the fourth pressure chamber 44 to a tank 16 for hydraulic fluid, and another controllable valve 50 disposed in the other hydraulic passage 48, wherein the other controllable valve 50 is configured to close and open the other hydraulic passage 50. In this way, when the auxiliary component 14 moves relative to the main component 12, such as by folding the auxiliary component 14 against the main component 12 using a second moving force, the other bypass assembly 46 can be configured to guide hydraulic fluid from the fourth pressure chamber 44.

[0112] Another controllable valve 50 can be controlled independently of the main hydraulic control assembly 10.

[0113] Another controllable valve 50 can be manually controlled, for example by turning a lever or a knob. Alternatively, as shown, another controllable valve 50 can be controlled via an autonomous control assembly 36. Thus, an operator can operate the autonomous control assembly 36 to move the auxiliary component 14 relative to the main component 12.

[0114] In addition, another controllable valve 50 can be adjusted between closed and open positions, for example, to control the flow of hydraulic fluid through another hydraulic passage 48.

[0115] Since the wind propulsion system 4 is configured to move the auxiliary component 14 relative to the main component 12 using a second moving force independent of the main hydraulic control component 10, the hydraulic pump of the main hydraulic control component 10 is not required to move the auxiliary component 14 relative to the main component 12 in case the main hydraulic control component 10 fails.

[0116] According to some embodiments, such as the one shown, another hydraulic passage 48 includes or forms a flow restrictor 52, which limits the maximum flow rate of hydraulic fluid through the other hydraulic passage 48, such that the hydraulic pressure in the fourth pressure chamber 44 generates a hydraulic pressure opposite to the second moving force to limit the moving speed of the auxiliary component 14. In this way, the auxiliary component 14 is prevented from moving at an uncontrollable speed, although the movement of the auxiliary component 14 relative to the main component 12 is not controlled by the main hydraulic control assembly 10, in case the latter malfunctions.

[0117] In other words, the movement speed of the auxiliary component 14 affected by the second moving force is limited.

[0118] One or more hydraulic fluid lines or pipes may be shared by another bypass assembly 46 and the main hydraulic control assembly 10, but the hydraulic fluid flow control device of the other bypass assembly 46 (such as another controllable valve 50 and flow restrictor 52) is separate from the hydraulic fluid flow control device (such as anti-balance valve 24 or other corresponding load holding hydraulic assembly and hydraulic pump of main hydraulic control assembly 10).

[0119] According to some embodiments, such as the one shown, the bypass assembly 30 includes a branch conduit 54 connected to a third pressure chamber 42 for generating a second motive force by directing hydraulic fluid from the second pressure chamber 28 of the first hydraulic actuator 8 to the third pressure chamber 42 of the second hydraulic actuator 18. In this manner, when the wind-powered engagement unit 6 is tilted using a second tilting force and hydraulic fluid is directed through the bypass assembly 30, hydraulic fluid can be directed to the second hydraulic actuator 18 and its third pressure chamber 42 for generating a second motive force independently of the main hydraulic control assembly 10 via the second hydraulic actuator 18.

[0120] An additional controllable valve 56 may be arranged in the branch pipe 54 to guide hydraulic fluid through the branch pipe 54. Suitablely, the branch pipe 54 is connected to other parts of the bypass assembly 30 upstream of the controllable valve 34, so that the flow of hydraulic fluid through the branch pipe 54 can also be controlled by the controllable valve 34.

[0121] The bypass assembly 30 can be connected to the first pressure chamber 26 of the first hydraulic actuator 8. The conduit 58 can form part of the connection between the hydraulic passage 32 and the first pressure chamber 26. Therefore, when the wind-powered engagement unit 6 is tilted using the second tilting force, hydraulic fluid can be drawn from the bypass assembly 30 into the first pressure chamber 26.

[0122] Similarly, another bypass assembly 46 may be connected to the third pressure chamber 42 of the second hydraulic actuator 18. Another pipe 60 may form part of the connection between another hydraulic passage 48 and the third pressure chamber 42. Thus, when the auxiliary component 14 is moved relative to the main component 12 by the second moving force, hydraulic fluid can be drawn from the other bypass assembly 46 into the third pressure chamber 42.

[0123] According to some embodiments, the wind propulsion system 4 may include a separate hydraulic pump 41, which is separate from the main hydraulic control assembly 10, wherein the separate hydraulic pump 41 is configured to supply hydraulic fluid to a third pressure chamber 42 for generating a second tilting force.

[0124] In this way, personnel can start another hydraulic pump 41, which is separate from the main hydraulic control assembly 10, to generate a second tilting force, for example, in case the main hydraulic control assembly 10 malfunctions.

[0125] When the main hydraulic control assembly 10 controls the first and second hydraulic actuators 8, 18, check valves can be provided to prevent hydraulic fluid from flowing into the bypass assembly 30 and another bypass assembly 46. For example, as shown, check valves can be arranged in branch pipes 54, pipe 58 and another pipe 60.

[0126] Figures 3a-3d A schematic top view of the wind-powered junction unit 6 is shown.

[0127] exist Figures 3a-3d The image shows the folding sequence of the auxiliary component 14 relative to the main component 12 of the wind-powered coupling unit 6.

[0128] As discussed above, the wind-powered engagement unit 6 can be a wing sail 6'. Therefore, the main component 12 can be a main wing sail 12 and the auxiliary component 14 can be a flap 14. A second hydraulic actuator 18 is indicated for moving the auxiliary component 14 relative to the main component 12.

[0129] exist Figures 3a-3d In each of the diagrams, the wind direction is indicated by three arrows. The diagram shows how the second moving force can be used as an aerodynamic component to fold the auxiliary component 14 against the main component 12.

[0130] Wind contributes to the aerodynamic components. Figures 3a to 3d The sequence illustrates how wind will blow towards auxiliary component 14 when the wind-powered coupling unit 6 rotates. The wind-powered coupling unit 6 can be rotated by a dedicated mechanism. Alternatively, the vessel carrying the wind-powered coupling unit 6 can be manipulated to rotate the wind-powered coupling unit 6 relative to the wind.

[0131] The second moving force will cause the second hydraulic component 18 to extend until the auxiliary component 14 folds against the main component 12.

[0132] It should be understood that the foregoing is illustrative of various exemplary embodiments and that the invention is defined solely by the appended claims. Those skilled in the art will recognize that the exemplary embodiments may be modified without departing from the scope of the invention as defined by the appended claims, and different features of the exemplary embodiments may be combined to form embodiments different from those described herein.

Claims

1. A wind propulsion system (4) comprising a wind engaging unit (6), a first hydraulic actuator (8) arranged to generate a first tilting force for tilting the wind engaging unit (6), and a main hydraulic control assembly (10) for controlling the first hydraulic actuator (8), wherein, the first hydraulic actuator (8) comprises a first pressure chamber (26) for receiving hydraulic fluid to generate the first tilting force and a second pressure chamber (28) for receiving hydraulic fluid to generate a force opposite the first tilting force, wherein, the main hydraulic control assembly (10) is configured to direct hydraulic fluid to and from the first and second pressure chambers (26, 28), wherein, the wind propulsion system (4) further comprises a bypass assembly (30) connected to the second pressure chamber (28), the bypass assembly (30) being separate from the main hydraulic control assembly (10), wherein, the wind propulsion system (4) is configured to tilt the wind engaging unit (6) with a second tilting force generated independently of the main hydraulic control assembly (10), and wherein, the bypass assembly (30) is configured to direct hydraulic fluid from the second pressure chamber (28) when tilting the wind engaging unit (6) with the second tilting force.

2. The wind propulsion system (4) according to claim 1, wherein the bypass assembly (30) comprises a hydraulic passage (32) connecting the second pressure chamber (28) with a tank (16) for hydraulic fluid and a controllable valve (34) arranged in the hydraulic passage (32), wherein the controllable valve (34) is configured to close and open the hydraulic passage (32).

3. The wind propulsion system (4) according to claim 2, wherein, the hydraulic passage (32) comprises or forms a flow restriction (38) limiting a maximum flow rate of hydraulic fluid through the hydraulic passage (32) such that a hydraulic pressure in the second pressure chamber (28) generates a hydraulic force opposite the second tilting force to limit a tilting speed of the wind engaging unit (6).

4. The wind propulsion system (4) according to any of the preceding claims, wherein, the wind engaging unit (6) comprises a main part (12) and an auxiliary part (14), wherein, the wind propulsion system (4) comprises a second hydraulic actuator (18) arranged to generate a first movement force for moving the auxiliary part (14) relative to the main part (12), wherein, the second hydraulic actuator (18) comprises a third pressure chamber (42) for receiving hydraulic fluid to generate the first movement force and a fourth pressure chamber (44) for receiving hydraulic fluid to generate a force opposite the first movement force, wherein, the main hydraulic control assembly (10) is configured to direct hydraulic fluid to and from the third and fourth pressure chambers (42, 44), wherein, the wind propulsion system (4) further comprises a further bypass assembly (46) connected to the fourth pressure chamber (44), the further bypass assembly (46) being separate from the main hydraulic control assembly (10), and wherein, the wind propulsion system (4) is configured to move the auxiliary part (14) relative to the main part (12) with a second movement force generated independently of the main hydraulic control assembly (10), and wherein, the further bypass assembly (46) is configured to direct hydraulic fluid from the fourth pressure chamber (44) when moving the auxiliary part (14) relative to the main part (12) with the second movement force. The further bypass assembly (46) is configured to conduct hydraulic fluid from the fourth pressure chamber (44) when the auxiliary component (14) is moved with the second movement force.

5. The wind propulsion system (4) according to claim 4, wherein The further bypass assembly (46) comprises a further hydraulic passage (48) connecting the fourth pressure chamber (44) with a tank (16) for hydraulic fluid and a further controllable valve (50) arranged in the further hydraulic passage (48), wherein the further controllable valve (50) is configured to close and open the further hydraulic passage (48).

6. The wind propulsion system (4) according to claim 5, wherein The further hydraulic passage (48) comprises or forms a flow restriction (52) that limits a maximum flow rate of hydraulic fluid through the further hydraulic passage (48) such that a hydraulic pressure in the fourth pressure chamber (44) is generated opposite to the second movement force to limit a movement speed of the auxiliary component (14).

7. The wind propulsion system (4) according to any one of claims 4 to 6, wherein, The bypass assembly (30) comprises a branch conduit (54) connected to the third pressure chamber (42) for generating the second movement force by conducting hydraulic fluid from a second pressure chamber (28) of the first hydraulic actuator (8) to the third pressure chamber (42) of the second hydraulic actuator (18).

8. The wind propulsion system (4) according to any one of claims 4 to 7, wherein, The second movement force comprises a component of aerodynamic force.

9. The wind propulsion system (4) according to any one of claims 4 to 8, wherein, The second movement force comprises a component of gravitational force.

10. The wind propulsion system (4) according to any of the preceding claims, wherein, The second tilting force comprises a component of gravitational force.

11. The wind propulsion system (4) according to any of the preceding claims, wherein, The second tilting force comprises a component of aerodynamic force.

12. The wind propulsion system (4) according to any of the preceding claims, comprising a hydraulic pump (40) separate from the main hydraulic control assembly (10), wherein The hydraulic pump (40) is configured to supply hydraulic fluid to the first pressure chamber (26) for generating the second tilting force.

13. The wind propulsion system (4) according to any of claims 4 to 9, comprising a further hydraulic pump (41) separate from the main hydraulic control assembly (10), wherein The further hydraulic pump (41) is configured to supply hydraulic fluid to the third pressure chamber (42) for generating the second movement force.

14. The wind propulsion system (4) according to any of the preceding claims, wherein, The wind engaging unit (6) comprises or consists of a wing sail (6'), a rotor sail, a turbine sail or similar.

15. A marine vessel (2) comprising a wind propulsion system (4) according to any of the preceding claims.

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