Wind propulsion device

Abstract

Improves aerodynamic characteristics. [Solution] One embodiment of the wind propulsion device is a wind propulsion device that is installed on a moving body and generates propulsion force by receiving wind. It comprises a rotating body having a frame portion formed in a circular ring shape centered on a rotation axis and capable of rotating around the rotation axis, and a plurality of blades that are each fixed to the frame portion and are arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis, and the plurality of blades include a central blade whose imaginary line connecting both ends passes through the center of the frame portion.

Description

[Technical Field]

[0001] The present invention relates to wind propulsion devices. [Background technology]

[0002] Patent Document 1 discloses a sailing ship that has windmill-shaped vertical blades that rotate around a vertical axis, and a propeller connected to the vertical axis, and that can be propelled by wind power. The trailing edge of the vertical blade is connected to a wire extending from an axis that is eccentric in the downwind direction with respect to the rotation axis of the leading edge of the vertical blade. The vertical blade is configured to be able to swing freely around the rotation axis of the leading edge of the vertical blade. Patent Document 2 discloses a wind power generator including a main shaft extending vertically, an upper bearing provided on the top of the main shaft, a lower bearing provided on the bottom of the main shaft, a frame connected to the main shaft via the upper and lower bearings, blades attached to the main shaft, a motor shaft connected to the main shaft via the lower bearing, and a generator connected to the motor shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-199287 [Patent Document 2] Chinese Patent Application Publication No. 101684778 Summary of the Invention [Problem to be solved by the invention]

[0004] In sailing ships with the purpose of propulsion using wind power as in Patent Document 1, and with vertical wings that rotate around a main axis extending in the vertical direction as in Patent Document 2, a cylinder may be provided in the center to reduce wobble of the axis of rotation. If the cylinder is made too thick to increase strength and rigidity, the aerodynamic characteristics consisting of lift and rotational force will be reduced. Note that aerodynamic characteristics are the combination of lift (force perpendicular to the wind, Magnus force) and rotational force (power generation energy, normal rotational speed, no-load rotational speed).

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a wind-powered propulsion device that can improve aerodynamic characteristics. [Means for solving the problem]

[0006] As a means for solving the above problems, the present invention has the following configuration. (1) A wind-powered propulsion device according to an aspect of the present invention is a wind-powered propulsion device that is installed on a moving body and receives wind to generate propulsive force, Extends vertically The rotor has a frame formed in a circular ring shape centered on a rotation axis and is rotatable around the rotation axis; and a plurality of blades each fixed to the frame and arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis, the plurality of blades including a central blade whose imaginary line connecting both ends passes through the center of the frame.

[0007] According to this configuration, by providing a central blade at the center of the frame, the aerodynamic characteristics are improved compared to when there is nothing in the center of the frame or when a cylinder is provided.

[0008] (2) In the wind propulsion device described in (1) above, the central blade may have a closed cross section in a cross section intersecting with an axial direction along the rotation shaft.

[0009] (3) In the wind propulsion device described in (1) above, the frame may be made of a rigid body, and the blades may be made of a non-rigid body.

[0010] (4) In the wind propulsion device described in (1) or (2) above, the central blade may include a central pillar provided at the center of the frame portion when viewed from an axial direction along the rotation axis, and a resin blade body provided to cover the central pillar.

[0011] (5) In the wind propulsion device described in (1) or (2) above, the central blade may comprise, when viewed from an axial direction along the rotation axis, a central pillar provided at the center of the frame portion, a pair of support pillars provided at both ends of the imaginary straight line, and a blade body formed of a cloth stretched over the pair of support pillars and the central pillar.

[0012] (6) In the wind propulsion device described in (1) or (2) above, the central blade may comprise a pair of struts provided at both ends of the imaginary line when viewed from the axial direction along the rotation axis, and a blade body made of cloth stretched over the pair of struts.

[0013] (7) In the wind propulsion device described in any one of (1) to (6) above, the blades other than the central blade among the plurality of blades may be curved radially outward relative to the imaginary straight line.

[0014] (8) In the wind propulsion device described in any one of (1) to (7) above, the rotating body may further have a propeller-shaped beam portion whose both ends are connected to the inner circumference of the frame portion and which connects the multiple blades together.

[0015] (9) In the wind propulsion device described in any one of (1) to (8) above, the plurality of blades may be arranged so that both ends are located on an imaginary circle centered on the rotation axis.

[0016] (10) In the wind propulsion device described in any one of (1) to (9) above, the plurality of blades may be arranged so as to be symmetrical with respect to a center line that passes through the center of the frame portion and is parallel to the virtual straight line, when viewed from an axial direction along the rotation axis.

[0017] (11) In the wind propulsion device described in any one of (1) to (10) above, the plurality of blades may be arranged so as to be symmetrical with respect to a center line that passes through the center of the frame portion and is perpendicular to the virtual straight line, when viewed from an axial direction along the rotation axis.

[0018] (12) In the wind propulsion device described in any one of (1) to (11) above, when viewed from an axial direction along the rotation axis, the blades of the plurality of blades that are closest to the center of the frame portion may be arranged so that the length of the virtual straight line is equal to or greater than 1 / 2 of the diameter of the frame portion.

[0019] (13) In the wind propulsion device described in any one of (1) to (12) above, the plurality of blades may have a twisted shape such that a first imaginary line connecting both ends of each of the plurality of blades at a first position on the rotation axis and a second imaginary line connecting both ends of each of the plurality of blades at a second position on the rotation axis different from the first position intersect when viewed from an axial direction along the rotation axis. [Effects of the Invention]

[0020] According to the present invention, it is possible to improve aerodynamic characteristics. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view of a wind propulsion system according to a first embodiment. FIG. [Figure 2] 1 is a diagram illustrating an example of the functional configuration of a wind power propulsion system according to a first embodiment. [Figure 3] FIG. 1 is a diagram showing an example of the flow of energy and the like in a wind propulsion system together with a comparative example. [Figure 4] 1 is a perspective view of a wind-powered propulsion device according to a first embodiment. FIG. [Figure 5] 1 is a perspective view of a first position of a plurality of blades in a wind-powered propulsion device according to a first embodiment, as viewed from above. FIG. [Figure 6] FIG. 3 is a perspective view of the second position of the blades of the wind-powered propulsion device of the first embodiment, as viewed from above. [Figure 7] This is a comparison diagram of the effect of the number of blades (lift, drag, rotational force). [Figure 8] This is a comparison diagram of the effects of wing shape (lift, drag, and rotational force). [Figure 9] This is a comparison diagram of the effects of the central wing (lift, drag, and rotational force). [Figure 10] FIG. 10 is a perspective view of a wind-powered propulsion device according to a second embodiment. [Figure 11] FIG. 6 is a schematic diagram showing a central blade of a wind-powered propulsion device according to a second embodiment. [Figure 12] FIG. 10 is a schematic diagram showing a central blade of a wind-powered propulsion device according to a third embodiment. [Figure 13] FIG. 10 is a view of the wind-powered propulsion device of the fourth embodiment as seen from the vertical direction. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, wind propulsion devices and wind propulsion systems according to embodiments of the present invention will be described with reference to the drawings. In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean the exact arrangement, but also include relative displacements with tolerances or angles or distances that provide the same functionality. In the drawings used in the following description, the scale of each component has been appropriately adjusted to make it recognizable.

[0023] <Wind propulsion system> Fig. 1 is a perspective view of a wind propulsion system 100 according to a first embodiment. Fig. 2 is a diagram showing an example of the functional configuration of the wind propulsion system 100 according to the first embodiment. Referring to Figures 1 and 2 together, the wind propulsion system 100 is installed on a ship 2 (an example of a moving body) and comprises a wind propulsion device 1 that receives wind and generates propulsion force, and a wind turbine sail control device 140 (an example of a wind control device) that controls the wind propulsion device 1.

[0024] The wind propulsion device 1 comprises a wind turbine sail main body 111 that can rotate around a rotation axis RC (see FIG. 4) that extends vertically from the hull 3. The wind propulsion device 1 further comprises an electric motor 41 that rotates the wind turbine sail main body 111. The wind turbine sail main body 111 comprises an assembly 4 that includes a plurality of plate-shaped blades 10A to 10I that are connected together so as to be rotatable together around the rotation axis.

[0025] The wind propulsion device 1 has a frame 21 formed in an annular shape centered on a rotation axis RC, and is equipped with rotors 20A, 20B that can rotate about the rotation axis RC, and a plurality of blades 10A-10I that are each fixed to the frame 21 and are arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis RC (see FIG. 4). The plurality of blades 10A-10I includes a central blade 10A whose imaginary line connecting both ends passes through the center of the frame 21. The rotors 20A, 20B with the frame 21 and the plurality of blades 10A-10I constitute an assembly 4.

[0026] The wind power control device 140 includes a speedometer 65 that acquires the moving speed of the vessel 2, a detection unit 7 that acquires wind condition information including the current wind speed and wind direction in the area where the vessel 2 is located, a calculation unit 126 that calculates the relative wind direction acting on the wind propulsion device 1 based on the acquired moving speed of the vessel 2 and wind condition information, and a rotation control unit 40 that controls the electric motor 41 in accordance with the calculated relative wind direction to adjust the rotation speed of the wind turbine sail main body 111. The wind propulsion device 1 that constitutes the wind propulsion system 100 functions as a wind turbine sail that propels the vessel 2 by catching wind and generating lift.

[0027] The wind propulsion system 100 includes: the wind propulsion device 1, which includes the wind turbine sail main body 111, the detection unit 7, the reception unit 8, and the rotation control unit 40 described above; a remote control device 120, which includes an operation unit 121 operated to control the propulsion speed of the ship 2, and a determination unit 134 that determines the target thrust of the wind propulsion device 1 and the target thrust of the propeller 51 driven by the prime mover 50 attached to the ship 2 according to the operation position of the operation unit 121; a wind turbine sail control device 140 that controls the rotation speed of the wind turbine sail main body 111 about the rotation axis according to the target thrust of the wind propulsion device 1; and a prime mover control device 150 that controls the rotation speed of the prime mover 50 according to the target thrust of the propeller 51. The wind propulsion system 100 constitutes a system (an integrated ship propulsion system) that integrates and controls two types of propulsion: propulsion by the wind propulsion device 1 and propulsion by the propeller 51 driven by the prime mover 50.

[0028] The vessel 2 is equipped with a remote control device 120, a prime mover 50, a shaft 52, a propeller 51, a shaft horsepower meter 55, a detection system 60, a speedometer 65, and a prime mover control device 150. Note that the vessel 2 does not necessarily have to be a vessel operated by a crew member. For example, the vessel 2 may be a vessel capable of operating autonomously.

[0029] The remote control device 120 executes a program (hereinafter referred to as the "vessel control program") that controls the operation of the vessel 2. By executing the vessel control program, the remote control device 120 functions as a device that includes an overall control unit 130, an operation unit 121, a communication unit 122, an output unit 123, a calculation unit 126, and a memory unit 124. The remote control device 120 includes the overall control unit 130 that controls the operation of each functional unit of the remote control device 120.

[0030] The integrated control unit 130 includes a processor 131, such as a CPU (Central Processing Unit), and a memory 132, which are connected by a bus. The processor 131 reads out the vessel control program stored in the storage unit 124 and stores the read vessel control program in the memory 132. The processor 131 executes the vessel control program stored in the memory 132.

[0031] The overall control unit 130 communicates with the prime mover control device 150, for example, by controlling the operation of the communication unit 122. The overall control unit 130 acquires information input via the operation unit 121, for example. The overall control unit 130 records information generated by the execution of a vessel control program, for example, in the storage unit 124. The overall control unit 130 acquires the rotation speed of the prime mover 50, for example. The integrated control unit 130 outputs, for example, the acquired rotation speed to the motor control device 150. In the following description, the value of the actual rotation speed of the motor 50 acquired (determined) by the integrated control unit 130 is also referred to as the "actual rotation speed."

[0032] The operation unit 121 is a handle for controlling the speed and direction of travel of the vessel 2. The operation unit 121 accepts operations by the crew. By operating the operation unit 121, the crew inputs either or both of the target engine speed and engine rotation direction to the remote control device 120. The target speed is the target rotation speed of the prime mover 50. The engine rotation direction is the rotation direction of the prime mover 50. The rotation direction of the prime mover 50 is either forward or reverse. The direction of travel of the vessel 2 when the rotation direction of the prime mover 50 is forward and the direction of travel of the vessel 2 when the rotation direction of the prime mover 50 is reverse are opposite to each other.

[0033] The operation unit 121 outputs the target rotation speed indicated by the result of the operation by the crew to the integrated control unit 130. The operation unit 121 outputs information indicating the engine rotation direction indicated by the result of the operation by the crew (hereinafter referred to as "rotation direction information") to the integrated control unit 130. Note that the operation unit 121 does not necessarily have to be operated by the crew. For example, when the ship 2 operates autonomously, the operation unit 121 may be operated by the integrated control unit 130 in accordance with a ship control program.

[0034] The communication unit 122 is configured to include a communication interface for connecting the remote control device 120 to the shaft horsepower meter 55, the detection system 60, the speedometer 65, and the prime mover control device 150. The communication unit 122 communicates with the shaft horsepower meter 55, the detection system 60, the speedometer 65, and the prime mover control device 150, for example, via either a wired or wireless connection. The communication unit 122 transmits, for example, target rotation speed, actual rotation speed, and rotation direction information to the prime mover control device 150.

[0035] The output unit 123 includes an output device such as a display device, such as a CRT (Cathode Ray Tube) display, a liquid crystal display, or an organic EL (Electro-Luminescence) display, or an audio output device, such as a speaker. The output unit 123 may be configured as an interface that connects these output devices to the output unit 123 itself. The output unit 123 outputs information related to the remote control device 120. The output unit 123 outputs, for example, the operation result of the operation unit 121.

[0036] The calculation unit 126 includes a processor (an example of a processing device) such as a CPU (Central Processing Unit) connected via a bus. The calculation unit 126 calculates various information related to the remote control device 120. The calculation unit 126 calculates the relative wind direction acting on the wind-powered propulsion device 1 based on, for example, the acquired moving speed of the vessel 2 and wind condition information.

[0037] The memory unit 124 is configured using a memory device such as a magnetic hard disk drive or a semiconductor memory device. The memory unit 124 stores various information related to the remote control device 120. The memory unit 124 stores, for example, a vessel control program in advance. The memory unit 124 stores, for example, information generated by executing the vessel control program. The memory unit 124 stores, for example, a history of operations of the operation unit 121 by the crew. The memory unit 124 stores, for example, a history of the actual rotation speed of the prime mover 50.

[0038] The prime mover 50 is an engine that generates propulsive power for the vessel 2. The prime mover 50 converts the energy contained in the fuel into power. The prime mover 50 may be any type of fuel or have any operating mechanism as long as it can convert the energy contained in the fuel into power. The prime mover 50 is, for example, a two-stroke diesel engine. The prime mover 50 may also be, for example, a four-stroke diesel engine or a gas engine. For simplicity of explanation, the vessel 2 will be described below using an example in which the prime mover 50 is a two-stroke engine.

[0039] The shaft 52 rotates due to the power generated by the prime mover 50. The rotation speed of the shaft 52 is proportional to the rotation speed of the prime mover 50. The shaft 52 transmits the power generated by the prime mover 50 to the propeller 51 by rotating.

[0040] The propeller 51 rotates by the power generated by the prime mover 50. The propeller 51 generates a propulsive force that moves the vessel 2 by its rotation.

[0041] The shaft horsepower meter 55 measures the power generated by the prime mover 50. The shaft horsepower meter 55 measures the power generated by the prime mover 50, for example, by detecting torsional strain occurring in the shaft 52 using either or both of an electrical method and an optical method.

[0042] Detection system 60 includes a sensor that detects the rotation speed of motor 50. The detection device may include, for example, a proximity sensor. The proximity sensor may be configured to output an ON signal when metal is located within a certain distance and an OFF signal when metal is not located within the certain distance. In this case, the proximity sensor outputs an ON signal when, for example, a convex portion of the asperities on the surface of shaft 52 is located within the detection range, and outputs an OFF signal when a concave portion is located within the detection range. Detection system 60 may detect the rotation speed of motor 50 based on such a change in the output of the proximity sensor and previously obtained information indicating the spacing between the asperities on shaft 52.

[0043] The detection system 60 is not limited to a proximity sensor and may include other types of devices. For example, the detection system 60 may include an encoder, a sensor that detects engine sound, or a sensor that detects engine vibration.

[0044] The speedometer 65 measures the speed of the vessel 2. The speedometer 65 measures the speed of the vessel 2, for example, by using the Doppler effect. The speed of the vessel measured by the speedometer 65 is specifically the speed of the vessel through water.

[0045] Prime mover control device 150 controls the operation of prime mover 50. Prime mover control device 150 determines the fuel injection amount and the timing of fuel injection based on the actual rotation speed acquired by determination unit 134. Prime mover control device 150 controls the operation of prime mover 50 so that the fuel injection amount is injected at the determined timing. Prime mover control device 150 controls the operation of prime mover 50 by executing a fuel input amount calculation process, a fuel input control process, and a rotation direction control process.

[0046] The fuel input amount calculation process is a process for calculating the amount of fuel to be input to the prime mover 50 (hereinafter also referred to as "fuel input amount") using a predetermined input amount calculation function based on the target rotation speed and the actual rotation speed. The input amount calculation function is a function that uses the target rotation speed and the actual rotation speed as explanatory variables and the fuel input amount as a response variable. The prime mover control device 150 calculates the fuel input amount by executing the fuel input amount calculation process.

[0047] The fuel input control process is a process for controlling the degree of opening and closing of a valve attached to a fuel input pipe so that the fuel input amount calculated by the fuel input amount calculation process is input to the prime mover 50. The fuel input pipe is a pipe that connects the prime mover 50 to a fuel tank (not shown), and is a pipe through which fuel flows from the fuel tank to the prime mover 50. The prime mover control device 150 executes the fuel input control process to input the fuel input amount from the fuel tank to the prime mover 50.

[0048] The rotation direction control process is a process for controlling the rotation direction of the prime mover 50 in the engine rotation direction. The rotation direction control process is a process for switching the rotation direction of the prime mover 50 between forward and reverse by operating, for example, the clutch of the prime mover 50. The prime mover control device 150 controls the rotation direction of the prime mover 50 in the engine rotation direction by executing the rotation direction control process.

[0049] The direction of the torque output by the prime mover 50 corresponds to the direction of rotation of the prime mover 50. Therefore, the direction of the torque when the rotation direction of the prime mover 50 is forward is opposite to the direction of the torque when the rotation direction of the prime mover 50 is reverse. Furthermore, the power generated by the prime mover 50 is a value obtained by multiplying the magnitude of the torque output by the prime mover 50 by the rotation speed of the prime mover 50.

[0050] The central control unit 130 further includes an acquisition unit 133 and a determination unit 134 . The acquisition unit 133 acquires the detection results of the detection system 60 via the communication unit 122. The determination unit 134 acquires the power measured by the shaft horsepower meter 55 via the communication unit 122. The acquisition unit 133 acquires the boat speed measured by the speedometer 65 via the communication unit 122. The acquisition unit 133 acquires the fuel input amount calculated by the prime mover control device 150 via the communication unit 122. The acquisition unit 133 acquires the target rotation speed and rotation direction information output by the operation unit 121 via the communication unit 122.

[0051] The determination unit 134 executes a rotation speed determination process. The rotation speed determination process is a process for determining one value of the rotation speeds obtained from the detection system 60 as the actual rotation speed of the prime mover 50 based on at least one of the target rotation speed, status information that is information related to the status of the prime mover 50, and the vessel speed of the vessel 2. Candidates for the actual rotation speed are, for example, a first rotation speed and a second rotation speed. The status information includes, for example, the amount of fuel input. The status information includes, for example, the power measured by the shaft horsepower meter 55.

[0052] The overall control unit 130 outputs the actual rotation speed determined by the determination unit 134 to the prime mover control device 150 via the communication unit 122. The overall control unit 130 outputs rotation direction information to the prime mover control device 150 via the communication unit 122. The overall control unit 130 outputs the target rotation speed to the prime mover control device 150 via the communication unit 122. The overall control unit 130 controls the operation of the output unit 123 to cause the output unit 123 to output information.

[0053] <Energy flow in wind propulsion systems> Figure 3 is a diagram showing an example of the flow of energy and the like in the wind propulsion system 100, along with a comparative example. In Figure 3, various arrows indicate the flow of physical things, information, and electricity (an example of the flow of energy and the like).

[0054] As shown in Figure 3, in the comparative example (existing system), wind power is first converted into rotational force to turn the propeller. Therefore, in the comparative example, the propulsion efficiency decreases due to the additional force conversion. In contrast, in the wind propulsion system 100 of the embodiment, the windmill sail is treated as a propeller, and the lift (Magnus force) generated by the windmill sail as it rotates is used as direct propulsion force. In other words, the wind propulsion system 100 of the embodiment uses wind directly as propulsion force. As a result, the wind propulsion system 100 of the embodiment has improved propulsion efficiency compared to the comparative example.

[0055] In this way, the wind propulsion system 100 of the embodiment receives wind with the windmill sails and converts it into propulsive force. For example, just as a sailboat receives wind with its sails and converts it into propulsive force, a windmill sailboat also converts wind directly into propulsive force with the windmill sails. The wind propulsion system 100 of the embodiment is characterized by converting wind into propulsive force as a sailboat. Note that in the wind propulsion system 100 of the embodiment, the performance of the windmill sails as sails is superior to that of general rigid sails.

[0056] <Electric motor> 2 to 4, the rotation control unit 40 includes an electric motor 41 that can drive the rotation of the wind turbine sail main body 111. The electric motor 41 can drive the rotation of the wind turbine sail main body 111 around the rotation axis, and can both increase and decrease the speed of the rotation of the wind turbine sail main body 111. In other words, the electric motor 41 can drive the rotation of the blades 10A to 10H around the rotation axis, and can both increase and decrease the speed of the rotation of the blades 10A to 10H around the rotation axis.

[0057] <Brake part> Wind propulsion system 100 further includes braking unit 45 that brakes the rotation of blades 10A-10H about the rotation axis when detection unit 7 detects a wind speed equal to or greater than a threshold. By braking the rotation of blades 10A-10H about the rotation axis in strong winds using braking unit 45, the rotation speed of blades 10A-10H can be slowed down and lift can be reduced. Furthermore, by reducing lift in headwinds, induced drag can also be reduced.

[0058] <Energy storage unit> The wind propulsion system 100 further includes an energy storage unit 46 that stores regenerative energy of the electric motor 41 that is generated when the rotation of the rotary shaft is decelerated. This makes it possible to utilize the regenerative energy of the electric motor 41 stored in the energy storage unit 46. For example, the energy storage unit 46 may be configured to include a battery, a capacitor, etc.

[0059] As mentioned above, the windmill sail functions as a sail that converts wind power into propulsion power, but also as a generator that can convert excess energy into electricity when wind power exceeds the propulsion command. For example, the extracted electricity can be used for driving the vehicle or for general purposes such as lighting.

[0060] <Acquisition part> The wind propulsion system 100 further includes an acquisition unit 133 that acquires the speed and direction of the currently occurring wind. If the acquired rotation speed of the blades 10A-10H, which rotate only due to the currently occurring wind, is equal to or lower than a threshold value, the rotation control unit 40 increases the rotation speed of the blades 10A-10H about the rotation axis by the electric motor 41. For example, if the thrust that can be generated by the windmill sails rotating without energy supply at the currently occurring wind speed and direction is insufficient in response to a thrust command, the thrust can be amplified by increasing the speed using the power of the electric motor 41.

[0061] For example, the threshold value of the rotation speed of blades 10A-10H (an example of the threshold value of the rotation speed of blades) is calculated based on a thrust command. For example, an optimal rotation speed may be calculated from the thrust command, and the rotation speed of blades 10A-10H may be increased by electric motor 41 based on the calculation result.

[0062] <Relationship between wind turbine sail control and prime mover control> The thrust that a windmill sailboat can generate without energy is limited. Therefore, the thrust that is insufficient without energy can be compensated for by the windmill sail drive mode (rotation drive of blades 10A to 10H). For example, the insufficient thrust in the windmill sail drive mode may be compensated for by the propeller 51 (propeller drive).

[0063] For example, the integrated control unit 130 calculates the optimal rotation speed of the blades 10A-10H around the rotation axis based on the received thrust command and the wind direction and wind speed detection results detected at the time of receiving the thrust command. For example, when controlling the rotation speed of the blades 10A-10H, seamless control may be performed without distinguishing between driving and braking by controlling the q-axis current using vector control. For example, the integrated control unit 130 may link the blades 10A-10H with the propeller 51 and adjust the thrust ratio between the wind turbine sail and the propeller 51 to maximize energy efficiency.

[0064] As described above, the wind propulsion system 100 is a system that converts wind power into propulsion force. For example, when a propulsion force command value is received from the remote control device 120, the system calculates the optimum rotation speed of the blades 10A to 10H based on the wind direction and wind speed so that the propulsion force is generated. The electric motor 41 is then controlled to achieve the calculated rotation speed. The rotation speed in this case also includes the direction of rotation. In the case of reverse rotation, the system controls the speed at a negative value.

[0065] For example, if the natural thrust of the wind turbine sailboat is insufficient, the propeller 51 is also driven. Depending on the wind direction, if the wind propulsion device 1 is more efficient than the propeller 51, the electric motor 41 is driven to increase the rotation speed and increase the propulsive force. On the other hand, if the propeller 51 is more efficient than the wind propulsion device 1, the wind propulsion device 1 is put into a natural start state, and the propeller 51 rotates to generate propulsive force. Note that it is also possible to drive both the electric motor 41 and the propeller 51 of the wind propulsion device 1.

[0066] For example, the rotational moment of the ship can be adjusted by arranging multiple windmill sails on the hull. For example, multiple windmill sails can be arranged at the front and rear of the hull, and the rotation speeds of the front and rear windmill sails can be made different. This makes it possible to generate a moment by making the force acting in the left and right directions of the ship different values ​​for the front and rear windmill sails.

[0067] <Rudder control section> 2, the wind propulsion system 100 further includes a steering control unit 125 that controls the steering so that the rudder is turned in the direction opposite to the inertial force that occurs in the opposite direction to the direction of changing the rotational speed of the blades 10A-10H when the rotation control unit 40 changes the rotational speed of the blades 10A-10H around the rotation axis. This works in conjunction with the rudder in anticipation of the torque acting on the hull 3 due to the inertial force, making it possible to prevent the hull 3 from rotating.

[0068] For example, when the rotation speed of the blades 10A-10H is changed by driving or braking, they may be linked to the rudder. For example, when the electric motor 41 is in a free state and the blades 10A-10H are rotating freely, they do not need to be linked to the rudder. For example, when braking or driving to change the rotation speed of the blades 10A-10H, a torque may act on the hull 3, causing the hull 3 to rotate. To prevent this, if only one wind propulsion device 1 is installed, it is advisable to link the rudder in anticipation of the torque acting on the hull 3 and prevent the hull 3 from rotating.

[0069] <Wind propulsion device> 1 and 2, a wind-powered propulsion device 1 is installed on a ship 2 and functions as a windmill sail that receives wind and generates propulsive force. In the example shown in the figures, one wind-powered propulsion device 1 is installed on the front part (bow) of the hull 3. Note that the installation manner of the wind-powered propulsion devices 1 (installation location, number of devices, etc.) is not limited to the above and can be changed according to design specifications.

[0070] <Windmill sail body> FIG. 4 is a perspective view of the wind turbine sail body 111 in the wind propulsion device 1 of the first embodiment. 4, the wind propulsion device 1 includes a wind turbine sail main body 111 that can rotate around a rotation axis RC (indicated by a dashed line in FIG. 4) that extends vertically from the hull 3. The wind turbine sail main body 111 includes an assembly 4 that is made up of rotating bodies 20A and 20B that can rotate around the axis RC, and a plurality of plate-shaped blades 10A to 10I that are respectively fixed to the rotating bodies 20A and 20B.

[0071] Rotating bodies 20A, 20B have frame portion 21 formed in an annular shape centered on rotation axis RC, and are configured to be rotatable about rotation axis RC. In the example shown in the figure, rotating bodies 20A, 20B include lower plate 20A to which the lower ends of multiple blades 10A-10I are fixed, and upper plate 20B to which the upper ends of multiple blades 10A-10I are fixed.

[0072] The multiple blades 10A-10I are each fixed to the frame 21 and are arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis RC. The multiple blades 10A-10I include a central blade 10A, the imaginary line connecting both ends of which passes through the center of the frame 21. The multiple blades 10A-10I are arranged so that both ends are located on an imaginary circle centered on the rotation axis RC. The axial direction along the rotation axis RC is vertical.

[0073] When viewed vertically, the blades 10A-10I closest to the center of the frame 21 are arranged so that the length of the imaginary line is at least half the diameter of the frame 21. In the example shown in the figure, the blades 10A-10I closest to the center of the frame 21 are all but the outermost of the blades 10A-10I. The length of the imaginary line is the length from one end of the blade to the other, or the so-called chord length. The chord length of the outermost blade of the blades 10A-10I may be less than half the diameter of the frame 21 (a virtual circle centered on the rotation axis RC). The chord lengths of the blades 10A-10I are not limited to those described above and can be changed according to design specifications.

[0074] In the illustrated example, the frame 21 (a virtual circle centered on the rotation axis RC) is a perfect circle when viewed vertically. Note that the shape of the virtual circle when viewed vertically is not limited to the above, and it may be an ellipse, an oval, or a closed ring shape formed by connecting curves.

[0075] Rotating bodies 20A, 20B further have propeller-shaped beams 22, both ends of which are connected to the inner periphery of frame 21 and which connect the plurality of blades 10A to 10I together. In the example shown in the figure, beam 22 passes through the center of frame 21 and both ends are connected to the inner periphery of frame 21. One beam 22 is provided on each of lower plate 20A and upper plate 20B. Note that the form (number, arrangement, etc.) of beams 22 is not limited to the above and can be changed according to design specifications.

[0076] The central blade 10A is arranged so that an imaginary line connecting both ends passes through the center of the frame portion 21. The central blade 10A has a closed cross section in a transverse cross section (a cross section intersecting with the axial direction along the rotation axis RC). In the example shown in the figure, the central blade 10A has a hollow structure. However, the central blade 10A may have a solid structure.

[0077] The central blade 10A includes a central pillar 71 provided at the center of the frame 21 when viewed vertically, and a resin blade body 70 provided to cover the central pillar 71. The central pillar 71 is provided coaxially with the rotation axis RC. The blade body 70 is made of, for example, FRP (Fiber Reinforced Plastics). The blade body 70 may be made of metal, wood, other resins, or a composite material of wood and resin.

[0078] In the illustrated example, the blades 10A to 10I including the central blade 10A are made of FRP (resin). Note that the blades other than the central blade 10A may be made of cloth, with only the central blade 10A being made of FRP (resin).

[0079] Of the multiple blades 10A-10I, the blades 10B-10I other than the central blade 10A are curved radially outward relative to an imaginary line. In other words, when viewed vertically, the blades 10B-10I that are outboard of the central blade 10A are formed in a cambered shape that curves radially outward relative to their respective imaginary lines. In the example shown in the figure, the eight blades 10B-10I other than the central blade 10A are formed in a cambered shape. Note that the blades 10B-10I other than the central blade 10A may have no camber (an elliptical shape or a thin type).

[0080] In the example of FIG. 4, the assembly 4 has one stage, but this is not limited to the above, and the number of stages of the assembly 4 can be changed according to design specifications. In the example of FIG. 1, multiple (e.g., three) assemblies 4A to 4C are provided along the vertical direction. For example, if there are multiple assemblies 4, A and B, the rotating bodies 20A and 20B of the assembly 4A and the assembly 4B may be common. For example, the installation mode of the rotating bodies 20A and 20B relative to the multiple assemblies 4 can be changed according to design specifications. Furthermore, the assemblies 4A and 4B may have the same shape, or the rotating bodies 20A and 20B may be bolted or welded.

[0081] Fig. 5 is a perspective view of the plurality of blades 10A-10I in the wind propulsion device of the first embodiment, seen from above, in a first position. Fig. 6 is a perspective view of the plurality of blades 10A-10I in the wind propulsion device of the first embodiment, seen from above, in a second position. In Figs. 5 and 6, the upper frame and other components that make up the assembly are omitted.

[0082] Referring to Figures 5 and 6 together, the multiple blades 10A to 10I have a twisted shape such that a first imaginary line (the first imaginary line FL1 of the central blade 10A is shown in the figure) connecting both ends of each of the multiple blades 10A to 10I at a first position on the rotation axis RC (the dotted line shown in the figure) and a second imaginary line (the second imaginary line FL2 of the central blade 10A is shown in the figure) connecting both ends of each of the multiple blades 10A to 10I at a second position different from the first position on the rotation axis RC intersect when viewed from the vertical direction.

[0083] In the example shown in the figure, the nine blades are twisted so that a first imaginary line FL1 at a first position on the rotation axis RC and a second imaginary line FL2 at a second position on the rotation axis RC intersect when viewed from the vertical direction. In other words, the nine blades are twisted so that their cross sections perpendicular to the vertical direction are the same at any position on the rotation axis RC. Note that the twisting manner (shape, etc.) of the multiple blades 10A-10I is not limited to the above and can be changed according to design specifications.

[0084] <Comparison of the effect of the number of blades> Figure 7 is a comparison diagram of the effect of the number of blades (lift, drag, and rotational force). As shown in Figure 7, five-blade, seven-blade, nine-blade, 11-blade, and 13-blade shapes were each created using a mesh (finite element model), and the effects of the number of blades (lift, drag, and rotational force) were compared through analysis. As a result, it was confirmed that the optimum number of blades was found at the midpoint. Specifically, lift reached its maximum value with 11 blades, drag reached its maximum value with 7 blades, and rotational force reached its maximum value with 11 blades. Note that the number of blades at which lift and drag reach their maximum values ​​will vary depending on conditions such as the size of the wind turbine sail and the thickness of the blades.

[0085] <Comparison of blade shape effects> Figure 8 is a comparison diagram of the effects of wing shapes (lift, drag, and rotational force). In Figure 8, a cylinder is shown at the center of rotation of the rotation axis. As shown in Figure 8, the elliptical wing, the first camber shape, and the second camber shape were each created as a mesh (finite element model), and the effects of the wing shapes (lift, drag, and rotational force) were compared through analysis. The second camber shape is a shape in which the wing is curved more greatly than the first camber shape. As a result, it was confirmed that adding camber increases lift, but decreases rotational force.

[0086] <Comparison of central blade effects> Figure 9 is a comparison diagram of the effects of the central wing (lift, drag, and rotational force). As shown in Figure 9, shapes with no center, a central circle, a thin central blade, a thick central blade, and only a central blade were created using meshes (finite element models), and the effects of the central blade (lift, drag, and rotational force) were compared through analysis. The analysis conditions were: size: diameter of the windmill sail body 4m, height 40m, wind speed: 10m / s, fixed rotation of the windmill sail at 54rpm. As a result, it was confirmed that the shape with a thin central blade was optimal (maximum values ​​for lift, drag, and rotational force).

[0087] <Action and effect> As described above, the wind propulsion device 1 according to this embodiment is a wind propulsion device that is installed on a ship 2 and receives wind to generate propulsive force. The wind propulsion device 1 has a frame 21 formed in an annular shape centered on a rotation axis RC, and is equipped with rotors 20A, 20B that can rotate about the rotation axis RC, and a plurality of blades 10A-10I that are each fixed to the frame 21 and are arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis RC. The plurality of blades 10A-10I includes a central blade 10A whose imaginary line connecting both ends passes through the center of the frame 21.

[0088] According to this configuration, by providing the central blade 10A at the center of the frame 21, the aerodynamic characteristics are improved compared to when there is nothing in the center of the frame 21 or when a cylinder is provided.

[0089] The central blade 10A according to this embodiment has a closed cross section in cross section. According to this configuration, the rigidity of the center blade 10A is improved compared to when the cross section is an open section.

[0090] The central blade 10A according to this embodiment includes a central pillar 71 provided at the center of the frame portion 21 when viewed in the vertical direction, and a blade body 70 made of resin provided so as to cover the central pillar 71. According to this configuration, the central blade 10A can be formed into a blade shape with high precision compared to when it is made of cloth, and therefore the aerodynamic characteristics are improved.

[0091] Of the plurality of blades 10A to 10I according to this embodiment, the blades 10B to 10I other than the central blade 10A are curved radially outward with respect to the imaginary straight line. This configuration improves lift compared to when the blades other than the central blade 10A have no camber (an elliptical shape).

[0092] Rotating bodies 20A and 20B according to this embodiment further include propeller-shaped beam portions 22 whose both ends are connected to the inner periphery of frame portion 21 and which connect the plurality of blades 10A to 10I together. This configuration improves the aerodynamic characteristics compared to when the blades 10A to 10I are connected to one another by horizontal bars.

[0093] The blades 10A to 10I according to this embodiment are provided so that both ends are positioned on an imaginary circle centered on the rotation axis RC. This configuration improves the propulsive force relative to the area occupied by the wing.

[0094] In the wind propulsion device 1 according to this embodiment, when viewed vertically, the blades 10A to 10I that are closest to the center of the frame 21 are arranged so that the length of the imaginary line is equal to or greater than half the diameter of the frame 21. This configuration increases the effect of accelerating and decelerating the wind in front and behind, and the Magnus effect can improve the propulsive force relative to the area occupied by the wing.

[0095] The multiple blades 10A to 10I in this embodiment have a twisted shape such that a first imaginary straight line FL1 connecting both ends of each of the multiple blades 10A to 10I at a first position on the rotation axis RC and a second imaginary straight line FL2 connecting both ends of each of the multiple blades 10A to 10I at a second position on the rotation axis RC that is different from the first position intersect when viewed from the vertical direction. With this configuration, the blades 10A to 10I are twisted in the vertical direction, which generates a vertical airflow, thereby reducing induced drag (e.g., the effect of the aspect ratio) and improving propulsion efficiency.

[0096] Second Embodiment The following describes a wind propulsion device 201 according to the second embodiment. In the following description, parts having the same functions as those described in the first embodiment are given the same names and symbols, and specific descriptions of their functions are omitted.

[0097] Fig. 10 is a perspective view of a wind-powered propulsion device 201 according to the second embodiment. Fig. 11 is a schematic diagram showing a central blade 210A of the wind-powered propulsion device 201 according to the second embodiment. 10 and 11, in the wind propulsion device 201 of the second embodiment, the central wing 210A comprises, when viewed vertically, a central pillar 71 provided at the center of the frame portion 21, a pair of support pillars 72 provided at both ends of an imaginary line, and a wing body 270 made of cloth stretched over the pair of support pillars 72 and the central pillar 71.

[0098] Rotating bodies 20A and 20B may include horizontal bars 222 (rod-shaped beams) whose both ends are connected to the inner periphery of frame 21 and which connect the plurality of blades 210A to 210I together. Rotating bodies 20A and 20B may include a plurality of wires 223 (tension structure) which are connected to frame 21 and which support the plurality of blades 210A to 210I, respectively. Blades 210B to 210I other than central blade 210A may be made of cloth stretched over frame 21 and wires 223.

[0099] In the illustrated example, the central pillar 71 is formed in a cylindrical shape. Each of the pair of support pillars 72 is formed in a cylindrical shape with a smaller diameter than the central pillar 71. The pair of support pillars 72 are formed in the same shape. The fabric of the central blade 210A is formed in a diamond shape when viewed from the vertical direction. Note that the configuration (number, configuration, shape, etc.) of the multiple blades 210A to 210I including the central blade 210A is not limited to the above and can be changed according to design specifications.

[0100] The central wing 210A of this embodiment comprises, when viewed from the vertical direction, a central pillar 71 located at the center of the frame portion 21, a pair of struts 72 located at both ends of an imaginary line, and a wing body 270 consisting of a cloth stretched over the pair of struts 72 and the central pillar 71. This configuration reduces manufacturing costs compared to when the center blade 210A is made of FRP.

[0101] <Third embodiment> The following describes a wind-powered propulsion device according to the third embodiment. In the following description, parts having the same functions as those described in the second embodiment are given the same names and symbols, and specific descriptions of their functions are omitted.

[0102] FIG. 12 is a schematic diagram showing a central blade 310A of a wind-powered propulsion device according to the third embodiment. As shown in FIG. 12, in the wind propulsion device of the third embodiment, the central wing 310A comprises a pair of struts 72 provided at both ends of an imaginary line when viewed vertically, and a wing body 370 made of cloth stretched over the pair of struts 72.

[0103] In the illustrated example, the central blade 310A does not have a central pillar 71. The pair of support pillars 72 are formed in a cylindrical shape. The pair of support pillars 72 are formed in the same shape. The fabric of the central blade 310A is formed in an I-shape (a single straight line) when viewed vertically. Note that the configuration (number, configuration, shape, etc.) of the multiple blades including the central blade 310A is not limited to the above and can be changed according to design specifications.

[0104] The central wing 310A according to this embodiment includes a pair of struts 72 provided at both ends of an imaginary line when viewed vertically, and a wing body 370 made of a cloth stretched over the pair of struts 72. This configuration reduces the weight and manufacturing costs of the wind propulsion device compared to when the central wing 310A has a central pillar 71.

[0105] <Fourth embodiment> The following describes a wind-powered propulsion device 401 according to the fourth embodiment. In the following description, parts having the same functions as those described in the first embodiment are given the same names and symbols, and specific descriptions of their functions are omitted.

[0106] FIG. 13 is a view of a wind-powered propulsion device 401 of the fourth embodiment viewed from the vertical direction. 13, in a wind propulsion device 401 of the fourth embodiment, the plurality of blades 410A to 410I are blades that extend in the vertical direction. The frame portion 21 is made of a rigid body. The plurality of blades 10A to 10I are made of a non-rigid body.

[0107] The frame 21 is made of a material that is more rigid than the wings 10A to 10I. The frame 21 is made of, for example, metal, resin (for example, FRP), wood, or a composite material of at least two of these. The wings 10A to 10I are made of, for example, cloth.

[0108] The blades 410A-410I are arranged to be symmetrical about a center line CL1 that passes through the center of rotation of the rotation axis RC and is parallel to the imaginary line when viewed from the vertical direction. The blades 410A-410I are arranged to be symmetrical about a center line CL2 that passes through the center of rotation of the rotation axis RC and is perpendicular to the imaginary line when viewed from the vertical direction.

[0109] The frame 21 according to this embodiment is made of a rigid body. The wings 410A to 410I are made of a non-rigid body. This configuration reduces manufacturing costs compared to when the blades 410A to 410I are made of a rigid body (for example, FRP).

[0110] The plurality of blades 410A to 410I according to this embodiment are provided so as to be symmetrical with respect to a center line CL1 that passes through the center of the frame portion 21 and is parallel to the imaginary line, when viewed in the vertical direction. According to this configuration, the center of gravity does not change even when the vessel rotates, so that the centrifugal force applied to the vessel 2 can be suppressed.

[0111] The plurality of blades 410A to 410I according to this embodiment are provided so as to be symmetrical with respect to a center line CL2 that passes through the center of the frame portion 21 and is perpendicular to the imaginary line, as viewed in the vertical direction. With this configuration, the characteristics of the resulting propulsive force do not change regardless of the direction in which the blades rotate, so the rotation direction can be changed to suit the wind direction.

[0112] <Modification> The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0113] Below, we will explain other examples (modifications) of moving bodies on which the wind propulsion devices of the above-mentioned embodiments can be installed. Ship sails, airplane wings, rotor blades, windmill blades, etc. are all similar in that they generate lift, and the present invention, which has the effect of generating large lift (Magnus force) while also generating electricity, can be applied. For example, the configurations of the above-mentioned embodiments can also be applied to moving bodies that move at high speeds (such as high-speed boats and automobiles). Furthermore, wind propulsion devices may be applied to the wings of flying bodies, or to airplanes, drones, flying cars, etc. Note that railways may also be used if water resistance is to be ignored. For example, wind propulsion devices may be installed on railways that run on low-utilization local lines. The mechanism of windmill sails is not limited to wind, but can also be applied to other fluids. For example, electricity can be generated by moving a boat across an ocean current (ocean current power generation). Ocean currents are slow, but they are denser than air. The Kuroshio Current has a speed of about 2 meters per second, but considering that it is 1,000 times denser than air, this is equivalent to a wind blowing at 20 meters per second. It is difficult to transmit electricity to ships, and there is a limit to how much electricity can be stored. Therefore, factories that use a lot of electricity can be built inside the ship (factory ships). Examples include hydrogen production and electrolytic aluminum refining. In this case, electricity can be transported directly by ship to the destination where it is needed. For example, a wind-powered propulsion device may be installed in a railway container. In this case, power can be supplied to refrigerated containers and the like, eliminating the need to supply electricity from a pantograph. In addition, the device can be electrically isolated from the railway, reducing the risk of accidents. It can also be used as a power source for the braking devices of freight cars. Similarly, wind-powered propulsion devices may be installed in truck containers, shipping containers, and the like.

[0114] Processing may be performed by recording a program for realizing the functions of the control unit according to the embodiment described above on a computer-readable recording medium, and reading and executing the program recorded on this recording medium into a computer system. It should be noted that the term "computer system" as used herein may include an operating system (OS) or hardware such as peripheral devices. In addition, "computer-readable recording medium" refers to writable non-volatile memory such as a flexible disk, optical magnetic disk, ROM (Read Only Memory), flash memory, etc., portable media such as a DVD (Digital Versatile Disc), and storage devices such as a hard disk built into a computer system.

[0115] Furthermore, the term "computer-readable recording medium" also includes a storage medium that stores a program for a certain period of time, such as a volatile memory (e.g., DRAM (Dynamic Random Access Memory)) inside an information processing device or a client computer system when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. The above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by transmission waves in the transmission medium. Here, the "transmission medium" that transmits the program refers to a medium that has the function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The above program may also be a program for realizing some of the above functions. Furthermore, the above program may be a so-called differential file (differential program) that can realize the above functions in combination with a program already recorded in the computer system.

[0116] In addition, the components in the above-described embodiment may be replaced with well-known components without departing from the spirit of the present invention. Also, the above-described modifications may be combined. Among the embodiments disclosed in this specification, those that are comprised of multiple objects may be integrated, and conversely, those that are comprised of a single object may be separated into multiple objects. Regardless of whether they are integrated, it is sufficient that they are configured to achieve the object of the invention. Among the embodiments disclosed in this specification, those in which multiple functions are provided in a distributed manner may have some or all of the multiple functions integrated together, and conversely, those in which multiple functions are provided in a distributed manner may have some or all of the multiple functions integrated together. Regardless of whether the functions are integrated or distributed, it is sufficient that the configuration can achieve the object of the invention. [Explanation of symbols]

[0117] 1, 201, 401... Wind propulsion device, 2... Ship (moving body), 10A to 10I, 210A to 210I, 410A to 410I... Blade, 10A, 210A, 310A... Central blade, 20A, 20B... Rotating body, 21... Frame portion, 22... Beam portion, 70, 270, 370... Blade body, 71... Central column, 72... Support, CL1, CL2... Center line, FL1, FL2... Virtual line, RC... Rotating axis

Claims

1. A wind-powered propulsion device that is installed on a moving body and receives wind to generate propulsive force, a rotating body having a frame portion formed in an annular shape centered on a rotation axis extending in a vertical direction, the rotating body being rotatable about the rotation axis; a plurality of blades each fixed to the frame portion and arranged so that imaginary lines connecting both ends of each blade are parallel in a direction perpendicular to the rotation axis; The plurality of blades include a central blade, and a virtual line connecting both ends of each central blade passes through the center of the frame portion. Wind propulsion device.

2. The central blade has a closed cross section when viewed in a cross section intersecting with an axial direction along the rotation shaft.

2. A wind-powered propulsion device according to claim 1.

3. The frame portion is made of a rigid body, The plurality of wings are composed of non-rigid bodies, 2. A wind-powered propulsion device according to claim 1.

4. When viewed from the axial direction along the rotation shaft, the central blade has a central pillar provided at the center of the frame; A resin blade body provided to cover the central pole.

3. A wind-powered propulsion device according to claim 1 or 2.

5. When viewed from the axial direction along the rotation shaft, the central blade has a central pillar provided at the center of the frame; A pair of support columns provided at both ends of the imaginary straight line; a wing body composed of a cloth stretched between the pair of struts and the central pole, 3. A wind-powered propulsion device according to claim 1 or 2.

6. When viewed from the axial direction along the rotation shaft, the central blade has A pair of support columns provided at both ends of the imaginary straight line; A wing body made of cloth stretched over the pair of struts.

3. A wind-powered propulsion device according to claim 1 or 2.

7. Among the plurality of blades, blades other than the central blade are curved radially outward with respect to the imaginary line. A wind-powered propulsion device according to any one of claims 1 to 3.

8. the rotor further includes a propeller-shaped beam portion whose both ends are connected to an inner periphery of the frame portion and which connects the plurality of blades together; A wind-powered propulsion device according to any one of claims 1 to 3.

9. The plurality of blades are provided so that both ends are located on a virtual circle centered on the rotation axis. A wind-powered propulsion device according to any one of claims 1 to 3.

10. the plurality of blades are provided so as to be symmetrical with respect to a center line that passes through a center of the frame portion and is parallel to the virtual straight line, when viewed from an axial direction along the rotation axis. A wind-powered propulsion device according to any one of claims 1 to 3.

11. the plurality of blades are provided so as to be symmetrical with respect to a center line that passes through a center of the frame portion and is perpendicular to the virtual straight line, when viewed from an axial direction along the rotation axis. A wind-powered propulsion device according to any one of claims 1 to 3.

12. When viewed from the axial direction along the rotation shaft, one of the plurality of blades located on a center side of the frame portion is provided so that the length of the imaginary straight line is equal to or greater than half of the diameter of the frame portion. A wind-powered propulsion device according to any one of claims 1 to 3.

13. the plurality of blades have a twisted shape such that a first imaginary line connecting both ends of each of the plurality of blades at a first position on the rotation shaft and a second imaginary line connecting both ends of each of the plurality of blades at a second position on the rotation shaft different from the first position intersect when viewed from an axial direction along the rotation shaft. A wind-powered propulsion device according to any one of claims 1 to 3.

Images