Wind propulsion device

Abstract

This invention provides a wind-powered propulsion device. One technical solution of this invention provides a wind-powered propulsion device disposed on a moving body, receiving wind to generate propulsion force. The wind-powered propulsion device comprises: a rotating body having a frame portion formed in an annular shape around a rotation axis, and capable of rotating around the rotation axis; and a plurality of blades, each fixed to the frame portion, and configured such that an imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis is parallel to the frame portion. The plurality of blades includes a central blade whose imaginary straight line connecting the two ends of each blade passes through the center of the frame portion.

Description

Technical Field

[0001] This invention relates to wind propulsion devices. Background Technology

[0002] Patent Document 1 discloses a sailboat in which the vertical blades rotating about a vertical axis are configured as a windmill, and the propeller is connected to the vertical axis, enabling the sailboat to propel itself based on wind power. The trailing edge of the vertical blade is connected to a line extending eccentrically downwind from the axis of rotation relative to the leading edge of the vertical blade. The vertical blade is configured to oscillate freely about the axis of rotation of the leading edge of the vertical blade.

[0003] Patent document 2 discloses a wind turbine generator comprising: a main shaft extending in a vertical direction; an upper bearing disposed on the upper part of the main shaft; a lower bearing disposed on the lower part of the main shaft; a frame connected to the main shaft via the upper and lower bearings; blades mounted on the main shaft; a motor shaft connected to the main shaft via the lower bearing; and a generator connected to the motor shaft.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 6-199287

[0007] Patent Document 2: Description of Chinese Patent Application Publication No. 101684778 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] In sailboats like those in Patent Document 1, which are designed for wind-powered propulsion and have vertical blades that rotate around a vertically extending main axis as in Patent Document 2, a cylinder is sometimes placed in the central part to reduce vibration of the rotating axis. If the cylinder is made too thick to increase strength and rigidity, the aerodynamic characteristics, which consist of lift and rotational force, will be reduced. Furthermore, aerodynamic characteristics are the sum of lift (force perpendicular to the wind, Magnus force) and rotational force (energy generated, operating rotational speed, no-load rotational speed).

[0010] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a wind propulsion device that can improve aerodynamic characteristics.

[0011] Solution for solving the problem

[0012] As a means of solving the above problems, the technical solution of the present invention has the following structure.

[0013] (1) The wind propulsion device of the present invention is disposed on a moving body and generates propulsion force by receiving wind. The wind propulsion device has: a rotating body having a frame portion formed in an annular shape around a rotation axis and capable of rotating around the rotation axis; and a plurality of blades, which are respectively fixed to the frame portion and are configured to be parallel to the imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis. The plurality of blades includes a center blade whose imaginary straight line connecting the two ends of each blade passes through the center of the frame portion.

[0014] According to this structure, by having a central blade at the center of the frame, the aerodynamic characteristics are improved compared to the case where there is nothing at the center of the frame or a cylinder is provided.

[0015] (2) In the wind propulsion device described in (1) above, the central blade may be a closed section when viewed in the section that intersects the axis along the rotation axis.

[0016] (3) In the wind propulsion device described in (1) above, the frame may be made of a rigid body and the multiple blades may be made of a material other than a rigid body.

[0017] (4) In the wind propulsion device described in (1) or (2) above, when viewed from the axial direction along the rotation axis, the central blade may include: a central column disposed at the center of the frame portion; and a blade body made of resin disposed to cover the central column.

[0018] (5) In the wind propulsion device described in (1) or (2) above, when viewed from the axial direction along the axis of rotation, the central blade may include: a central column disposed at the center of the frame; a pair of support columns disposed at both ends of the imaginary straight line; and a blade body consisting of a cloth stretched between the pair of support columns and the central column.

[0019] (6) In the wind propulsion device described in (1) or (2) above, when viewed from the axial direction along the axis of rotation, the central blade may have: a pair of support columns disposed at both ends of the imaginary straight line; and a blade body consisting of a cloth stretched on the pair of support columns.

[0020] (7) In any of the wind propulsion devices described in (1) to (6) above, the blades other than the central blade among the plurality of blades may be bent radially outward relative to the imaginary straight line.

[0021] (8) In any of the wind propulsion devices described in (1) to (7) above, the rotating body may also have a propeller-shaped beam that is connected at both ends to the inner periphery of the frame and connects the plurality of blades to each other.

[0022] (9) In any of the wind propulsion devices described in (1) to (8) above, the plurality of blades may be configured such that both ends are located on an imaginary circle centered on the axis of rotation.

[0023] (10) In any of the wind propulsion devices described in (1) to (9) above, the plurality of blades may be configured to be linearly symmetrical with respect to a center line that passes through the center of the frame and is parallel to the imaginary straight line when viewed from the axial direction along the axis of rotation.

[0024] (11) In any of the wind propulsion devices described in (1) to (10) above, the plurality of blades may be configured to be linearly symmetrical with respect to a center line passing through the center of the frame and orthogonal to the imaginary straight line when viewed from the axial direction along the axis of rotation.

[0025] (12) In any of the wind propulsion devices described in (1) to (11) above, when viewed from the axial direction along the rotation axis, the blade on the center side of the frame portion among the plurality of blades is configured such that the length of the imaginary straight line is more than 1 / 2 of the diameter of the frame portion.

[0026] (13) In any of the wind propulsion devices described in (1) to (12) above, the plurality of blades may be in a twisted shape such that a first imaginary straight line connecting the two ends of each of the plurality of blades at a first position on the rotation axis intersects a second imaginary straight line connecting the two ends of each of the plurality of blades at a second position on the rotation axis that is different from the first position when viewed from the axial direction along the rotation axis.

[0027] The effects of the invention

[0028] According to the present invention, aerodynamic characteristics can be improved. Attached Figure Description

[0029] Figure 1 This is a perspective view of the wind propulsion system of the first embodiment.

[0030] Figure 2 This is a diagram illustrating an example of the functional structure of the wind propulsion system according to the first embodiment.

[0031] Figure 3 This is a diagram illustrating an example of the flow of energy, etc., in a wind-powered propulsion system, together with a comparative example.

[0032] Figure 4 This is a perspective view of the wind propulsion device according to the first embodiment.

[0033] Figure 5 This is a perspective view of the first position of the multiple blades in the wind propulsion device of the first embodiment, viewed from above.

[0034] Figure 6 This is a perspective view of the second position of multiple blades in the wind propulsion device of the first embodiment, viewed from above.

[0035] Figure 7 This is a comparison chart of the effects of the number of blades (lift, drag, rotational force).

[0036] Figure 8 This is a comparison chart of the effects of blade shape (lift, drag, rotational force).

[0037] Figure 9 This is a comparison chart of the effects of the central blades (lift, drag, rotational force).

[0038] Figure 10 This is a perspective view of the wind propulsion device according to the second embodiment.

[0039] Figure 11 This is a schematic diagram showing the center blade of the wind propulsion device according to the second embodiment.

[0040] Figure 12 This is a schematic diagram showing the center blade of the wind propulsion device in the third embodiment.

[0041] Figure 13 This is a diagram showing the wind propulsion device of the fourth embodiment viewed from a vertical direction.

[0042] Explanation of reference numerals in the attached figures

[0043] 1. 201, 401, Wind propulsion device; 2. Ship (mobile body); 10A~10I, 210A~210I, 410A~410I, Blades; 10A, 210A, 310A, Center blades; 20A, 20B, Rotating body; 21, Frame; 22, Beam; 70, 270, 370, Blade body; 71, Center column; 72, Support column; CL1, CL2, Centerline; FL1, FL2, Imaginary straight line; RC, Rotation axis. Detailed Implementation

[0044] Hereinafter, a wind propulsion device and a wind propulsion system according to embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, expressions such as "parallel," "orthogonal," "centered," and "coaxial," indicating relative or absolute configurations, not only strictly mean such configurations, but also include states of relative displacement by angles or distances with tolerances, to the extent that the same function can be obtained. In the accompanying drawings used in the following description, the scale of each component has been appropriately altered to make each component a recognizable size.

[0045] <Wind Propulsion System>

[0046] Figure 1 This is a perspective view of the wind propulsion system 100 according to the first embodiment. Figure 2 This is a diagram illustrating an example of the functional structure of the wind propulsion system 100 according to the first embodiment.

[0047] Refer to together Figure 1 and Figure 2 The wind propulsion system 100 includes: a wind propulsion device 1, which is installed on the vessel 2 (an example of a moving body) and generates propulsion force by receiving wind; and a windmill sail control device 140 (an example of a wind control device) which controls the wind propulsion device 1.

[0048] The wind propulsion device 1 has a rotation axis RC (refer to) that extends vertically from the hull 3. Figure 4 The windmill sail body 111 rotates around the central axis. The wind propulsion device 1 also includes an electric motor 41 that rotates the windmill sail body 111. The windmill sail body 111 includes an assembly 4, which includes a plurality of plate-shaped blades 10A to 10I connected together to be able to rotate integrally around the rotation axis.

[0049] The wind-powered propulsion device 1 includes: rotating bodies 20A and 20B, each having a frame 21 formed in an annular shape around a rotation axis RC, and capable of rotating around the rotation axis RC; and multiple blades 10A to 10I, which are respectively fixed to the frame 21 and arranged to be parallel to the imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis RC (see reference). Figure 4 The multiple blades 10A to 10I include a central blade 10A whose imaginary straight line connects the two ends of each blade and passes through the center of the frame portion 21. The rotating bodies 20A and 20B having the frame portion 21 and the multiple blades 10A to 10I constitute the assembly 4.

[0050] The wind 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 of the area where the vessel 2 is located; a calculation unit 126 that calculates the relative wind direction applied to the wind propulsion device 1 based on the acquired moving speed and wind condition information of the vessel 2; and a rotation control unit 40 that controls the motor 41 according to the calculated relative wind direction, thereby adjusting the rotation speed of the windmill sail body 111. The wind propulsion device 1, which constitutes the wind propulsion system 100, generates lift by receiving wind and functions as a windmill sail to propel the vessel 2.

[0051] The wind propulsion system 100 includes: a wind propulsion device 1, which has the aforementioned windmill sail body 111, detection unit 7, receiving unit 8, and rotation control unit 40; a remote control device 120, which has an operation unit 121 operated to control the propulsion speed of the ship 2, and a determination unit 134 for determining the target thrust of the wind propulsion device 1 and the target thrust of the propeller 51 driven by the prime mover 50 installed on the ship 2 based on the operation position of the operation unit 121; a windmill sail control device 140, which controls the rotation speed of the windmill sail body 111 about the rotation axis based on the target thrust of the wind propulsion device 1; and a prime mover control device 150, which controls the rotation speed of the prime mover 50 based on the target thrust of the propeller 51. The wind propulsion system 100 constitutes a system that comprehensively controls both the propulsion by the wind propulsion device 1 and the propulsion by the propeller 51 driven by the prime mover 50 (integrated ship propulsion system).

[0052] 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. Furthermore, vessel 2 is not necessarily a crew-operated vessel. For example, vessel 2 could also be a vessel capable of autonomous navigation.

[0053] The remote control device 120 executes a procedure for controlling the actions of the vessel 2 (hereinafter referred to as the "vessel control procedure"). The remote control device 120 functions as a device comprising an integrated control unit 130, an operation unit 121, a communication unit 122, an output unit 123, a computing unit 126, and a storage unit 124 by executing the vessel control procedure. The remote control device 120 includes an integrated control unit 130 that controls the actions of each functional unit of the remote control device 120.

[0054] The integrated control unit 130 includes a processor 131 (such as a CPU, Central Processing Unit) and a memory 132 connected by a bus. The processor 131 reads the ship control program stored in the storage unit 124 and stores the read ship control program in the memory 132. The processor 131 executes the ship control program stored in the memory 132.

[0055] The integrated control unit 130 communicates with the prime mover control device 150, for example, by controlling the operation of the communication unit 122. The integrated control unit 130, for example, acquires information input via the operation unit 121. The integrated control unit 130, for example, stores information generated by executing a ship control program in the storage unit 124. The integrated control unit 130, for example, acquires the rotational speed of the prime mover 50.

[0056] The integrated control unit 130 outputs the acquired rotational speed to the prime mover control device 150, for example. In the following description, the actual rotational speed of the prime mover 50 acquired (determined) by the integrated control unit 130 is also referred to as the "actual rotational speed".

[0057] The operating unit 121 is a handle used to control the speed and direction of travel of the vessel 2. The operating unit 121 receives input from the crew. By operating the operating 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 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 can be either forward or reverse. The direction of travel of the vessel 2 when the prime mover 50 rotates forward is opposite to the direction of travel of the vessel 2 when the prime mover 50 rotates in reverse.

[0058] The operation unit 121 outputs the target engine speed indicated by the crew's operation to the integrated control unit 130. The operation unit 121 also outputs information indicating the engine rotation direction (hereinafter referred to as "rotation direction information"), representing the result of the crew's operation, to the integrated control unit 130. Furthermore, the operation unit 121 may not necessarily be operated by the crew. For example, in the case of autonomous navigation of the vessel 2, the operation unit 121 may also be operated by the integrated control unit 130 according to the vessel control program.

[0059] The communication unit 122 is configured to include a communication interface for connecting the remote control device 120 to the shaft power meter 55, the detection system 60, the speedometer 65, and the prime mover control device 150. The communication unit 122 communicates with the shaft power meter 55, the detection system 60, the speedometer 65, and the prime mover control device 150, for example, via either wired or wireless means. The communication unit 122, for example, transmits target speed, actual speed, and rotation direction information to the prime mover control device 150.

[0060] The output unit 123 is configured to include display devices such as CRT (Cathode Ray Tube) displays, liquid crystal displays, and organic EL (Electro-Luminescence) displays, as well as sound output devices such as speakers. The output unit 123 may also be configured as an interface connecting these output devices to this device. The output unit 123 outputs information related to the remote control device 120. For example, the output unit 123 outputs the operation results of the operation unit 121.

[0061] The computing unit 126 is configured to include a processor (such as a CPU, Central Processing Unit) connected by a bus (an example of a processing device). The computing unit 126 calculates various information related to the remote control device 120. For example, the computing unit 126 calculates the relative wind direction applied to the wind propulsion device 1 based on the acquired information on the ship 2's speed and wind conditions.

[0062] Storage unit 124 is configured to use a storage device such as a magnetic hard disk drive or a semiconductor storage device. Storage unit 124 stores various information related to the remote control device 120. For example, storage unit 124 may pre-store ship control programs. Storage unit 124 may store information generated by executing ship control programs. Storage unit 124 may store the history of crew operations on the control unit 121. Storage unit 124 may store the history of the actual rotational speed of the prime mover 50.

[0063] The prime mover 50 is the engine that generates propulsion for the ship 2. The prime mover 50 converts the energy inherent in the fuel into power. As long as the prime mover 50 can convert the energy inherent in the fuel into power, the type of fuel and the composition of its operation can be arbitrary. For example, the prime mover 50 is a two-stroke diesel engine. The prime mover 50 can also be a four-stroke diesel engine or a gas turbine engine. For simplicity, the following explanation will use the case where the prime mover 50 is a two-stroke engine as an example to illustrate the ship 2.

[0064] Shaft 52 rotates by the power generated by prime mover 50. The rotational speed of shaft 52 is proportional to the rotational speed of prime mover 50. Shaft 52 transmits the power generated by prime mover 50 to propeller 51 through rotation.

[0065] The propeller 51 rotates due to the power generated by the prime mover 50. The rotation of the propeller 51 generates propulsion that moves the ship 2.

[0066] A shaft power meter 55 measures the power generated by the prime mover 50. The shaft power meter 55 measures the power generated by the prime mover 50 by detecting the torsional strain generated on the shaft 52, for example, by either or both of electrical and optical methods.

[0067] The detection system 60 is configured to include a sensor for detecting the rotational speed of the prime mover 50. The detection device may also be configured to include a proximity sensor. The proximity sensor may be configured to output an on signal when a metal object is within a certain distance and an off signal when the metal object is not within a certain distance. In this case, the proximity sensor, for example, outputs an on signal when a protruding portion of a surface irregularity on the shaft 52 is within the detection range, and an off signal when a concave portion is within the detection range. The detection system 60 may also detect the rotational speed of the prime mover 50 based on such changes in the output of the proximity sensor and pre-observed information representing the intervals between the protrusions and concave portions of the shaft 52.

[0068] Furthermore, the detection system 60 is not limited to a proximity sensor, and may also be configured to include other types of devices. For example, the detection system 60 may be configured to include an encoder, a sensor for detecting engine sound, or a sensor for detecting engine vibration.

[0069] Speedometer 65 measures the speed of vessel 2. Speedometer 65 uses, for example, the Doppler effect to measure the speed. Specifically, the speed measured by speedometer 65 is the speed of the vessel relative to the water.

[0070] The prime mover control device 150 controls the operation of the prime mover 50. The prime mover control device 150 determines the fuel injection quantity and the timing of fuel injection based on the actual rotational speed obtained by the determination unit 134. The prime mover control device 150 controls the operation of the prime mover 50 by injecting the determined fuel injection quantity at the determined timing. The prime mover control device 150 controls the operation of the prime mover 50 by performing fuel input quantity calculation processing, fuel input control processing, and rotation direction control processing.

[0071] The fuel input calculation process is based on the target speed and the actual speed, and uses a pre-determined input calculation function to calculate the amount of fuel (hereinafter referred to as "fuel input") input to the prime mover 50. The input calculation function is a function that uses the target speed and the actual speed as explanatory variables and the fuel input as the target variable. The prime mover control unit 150 calculates the fuel input by executing the fuel input calculation process.

[0072] The fuel input control process controls the opening and closing of a valve installed on the fuel input pipe by inputting the amount of fuel calculated through the fuel input quantity calculation process into the prime mover 50. The fuel input pipe is the pipe connecting the prime mover 50 to a fuel tank (not shown), and is the pipe through which fuel flows from the fuel tank to the prime mover 50. The prime mover control device 150 inputs the required amount of fuel from the fuel tank into the prime mover 50 by executing the fuel input control process.

[0073] The rotation direction control process is the process of controlling the rotation direction of the prime mover 50 to the engine rotation direction. For example, the rotation direction control process switches the rotation direction of the prime mover 50 between forward and reverse rotation by operating the clutch of the prime mover 50. The prime mover control device 150 controls the rotation direction of the prime mover 50 to the engine rotation direction by executing the rotation direction control process.

[0074] Furthermore, the direction of the torque output by the prime mover 50 is the same as the direction of rotation of the prime mover 50. Therefore, the direction of the torque when the prime mover 50 rotates clockwise is opposite to the direction of the torque when the prime mover 50 rotates counterclockwise. In addition, the power generated by the prime mover 50 is the value obtained by multiplying the magnitude of the torque output by the prime mover 50 by its rotational speed.

[0075] The integrated control unit 130 also includes an acquisition unit 133 and a determination unit 134.

[0076] The acquisition unit 133 acquires the detection results from 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 ship 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.

[0077] The determination unit 134 performs a speed determination process. This process determines the actual speed of the prime mover 50 from a value obtained from the detection system 60 based on at least one of the following: a target speed, information related to the state of the prime mover 50 (i.e., state information), and the ship speed of the vessel 2. Candidates for the actual speed include, for example, a first speed and a second speed. State information includes, for example, the amount of fuel input. State information also includes, for example, the power measured by the shaft horsepower meter 55.

[0078] The integrated control unit 130 outputs the actual rotational speed determined by the determination unit 134 to the prime mover control device 150 via the communication unit 122. The integrated control unit 130 also outputs rotational direction information to the prime mover control device 150 via the communication unit 122. Furthermore, the integrated control unit 130 outputs the target rotational speed to the prime mover control device 150 via the communication unit 122. Finally, the integrated control unit 130 controls the operation of the output unit 123, causing the output unit 123 to output information.

[0079] <The flow of energy, etc. in a wind propulsion system>

[0080] Figure 3This is a diagram illustrating an example of the flow of energy, etc., in a wind-powered propulsion system 100, together with a comparative example. Figure 3 In the text, various arrows are used to represent physical flows, information flows, electrical flows (an example of the flow of energy, etc.).

[0081] like Figure 3 As shown, in the comparative example (existing system), wind power is temporarily converted into rotational force to rotate the propeller. Therefore, in the comparative example, the propulsion efficiency decreases accordingly with the conversion of the applied force.

[0082] In contrast, in the wind propulsion system 100 of this embodiment, the windmill sail is considered as a propeller, and the lift (Magnus force) generated by the wind-driven rotation of the windmill sail is directly used as the propulsion force. That is, in the wind propulsion system 100 of this embodiment, the wind is directly used as the propulsion force. Therefore, the propulsion efficiency is improved in the wind propulsion system 100 of this embodiment compared to the comparative example.

[0083] Thus, in the wind propulsion system 100 of this embodiment, a windmill sail receives wind and converts it into propulsion. Just as a sailboat uses a sail to receive wind and convert it into propulsion, a windmill sailboat also uses a windmill sail to directly convert wind into propulsion. The wind propulsion system 100 of this embodiment is characterized by converting wind into propulsion as a sailboat. Furthermore, in the wind propulsion system 100 of this embodiment, the performance of the windmill sail is superior to that of a conventional rigid sail.

[0084] <Electric motor>

[0085] Refer to together Figures 2 to 4 The rotation control unit 40 includes an electric motor 41 capable of rotating and driving the windmill sail body 111. The electric motor 41 can drive the rotation of the windmill sail body 111 around its rotation axis, and can also accelerate and decelerate the rotation of the windmill sail body 111. In other words, the electric motor 41 can drive the rotation of the blades 10A-10H around their rotation axes, and can also accelerate and decelerate the rotation of the blades 10A-10H around their rotation axes.

[0086] Braking Unit

[0087] The wind propulsion system 100 also includes a braking unit 45, which brakes the rotation of the blades 10A-10H around their rotation axis when the detection unit 7 detects a wind speed exceeding a threshold. By using the braking unit 45 to brake the rotation of the blades 10A-10H around their rotation axis during strong winds, the rotational speed of the blades 10A-10H can be reduced, thereby reducing lift. Furthermore, by reducing lift in headwinds, induced drag can also be reduced.

[0088] <Energy Storage Department>

[0089] The wind propulsion system 100 also includes an energy storage unit 46 that stores the regenerative energy of the electric motor 41 generated during the rotational deceleration of the rotating axis. This allows the regenerative energy of the electric motor 41 stored in the energy storage unit 46 to be utilized. For example, the energy storage unit 46 may be configured to include a battery, capacitor, or the like.

[0090] As described above, a windmill sail functions as a sail that converts wind power into propulsion, and when the wind force exceeds the propulsion command, it also functions as a generator that converts the excess energy into electricity. For example, the extracted electricity can be used for propulsion or for general purposes such as lighting.

[0091] <Acquisition Department>

[0092] The wind propulsion system 100 also includes an acquisition unit 133 for acquiring the wind speed and direction of the currently generated wind. When the rotational speed of the blades 10A-10H, which rotate only using the acquired currently generated wind, is below a threshold, the rotation control unit 40 uses the motor 41 to accelerate the rotational speed of the blades 10A-10H around the rotation axis. For example, when the thrust generated by a windmill sail rotating without energy supply in the currently generated wind speed and direction is insufficient relative to the thrust command, the thrust can be amplified by accelerating it using the force of the motor 41.

[0093] For example, the threshold for the rotational speed of blades 10A to 10H (an example of the threshold for the rotational speed of blades) is calculated based on the thrust command. For example, the optimal rotational speed can also be calculated based on the thrust command, and based on the calculation result, the rotational speed of blades 10A to 10H can be accelerated using motor 41.

[0094] <The Relationship Between Windmill Sail Control and Prime Motor Control>

[0095] When there is no energy, the thrust generated by windmills and sailboats is limited. Therefore, the propulsion mode of windmill sails (rotation drive of blades 10A~10H) can be used to supplement the insufficient amount of thrust when there is no energy.

[0096] For example, propeller 51 (propeller driven) can also be used to supplement the insufficient amount of thrust in the windmill sail's drive mode.

[0097] For example, the integrated control unit 130 calculates the optimal rotational speed of the blades 10A-10H centered on the rotation axis based on the received thrust command and the detected wind direction and speed when the thrust command is received. Alternatively, when controlling the rotational speed of the blades 10A-10H, vector control can be used to control the q-axis current, thereby achieving seamless control without distinguishing between drive and braking. Alternatively, the integrated control unit 130 can link the blades 10A-10H with the propeller 51, adjusting the thrust ratio of the windmill sail to the propeller 51 in a manner that maximizes energy efficiency.

[0098] As described above, the wind propulsion system 100 is a system that converts wind power into propulsion. For example, upon receiving a propulsion command value from the remote control device 120, the optimal rotational speed of the blades 10A to 10H is calculated based on the wind direction and wind speed to generate the propulsion. Then, the motor 41 is controlled to achieve the calculated rotational speed. The rotational speed mentioned here also includes the direction of rotation. In the case of reverse rotation, control is performed at a negative speed.

[0099] For example, if the natural thrust of a windmill or sailboat is insufficient, the propeller 51 is also driven. Although it also depends on the wind direction, if the wind propulsion device 1 is more efficient than the propeller 51, the electric motor 41 is put into driving mode to increase its speed and thus increase thrust. 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 natural starting mode, causing the propeller 51 to rotate and output thrust. Alternatively, it is also possible to have both the electric motor 41 and the propeller 51 driving the wind propulsion device 1.

[0100] For example, the ship's rotational torque can be adjusted by arranging multiple windmill sails on the hull. For instance, multiple windmill sails can be arranged fore and aft on the hull, creating a difference in their rotational speeds. This allows the forces applied to the ship in the left and right directions to be of different values ​​in the fore and aft sails, thus generating torque.

[0101] <Steering Gear Control Section>

[0102] Reference Figure 2 The wind propulsion system 100 also includes a servo control unit 125. When the rotational speed of the blades 10A-10H is varied around the rotational axis using the rotation control unit 40, the servo control unit 125 controls the servo to switch the rudder in the opposite direction to the inertial force generated in the direction opposite to the direction of the variation in the rotational speed of the blades 10A-10H. Therefore, it is possible to anticipate the torque acting on the hull 3 due to the aforementioned inertial force and cooperate with the rudder to prevent the hull 3 from rotating.

[0103] For example, it could be in cooperation with the rudder when changing the rotational speed of blades 10A-10H by driving or braking. Alternatively, it could be in cooperation without the rudder when the motor 41 is in a free state, allowing blades 10A-10H to rotate freely. For example, when braking or driving is applied to change the rotational speed of blades 10A-10H, torque acts on the hull 3, potentially causing it to rotate. To prevent this, in the case of only one wind-powered propulsion device 1, the torque acting on the hull 3 can be anticipated, and cooperation with the rudder can prevent the hull 3 from rotating.

[0104] <Wind Propulsion Device>

[0105] Refer to together Figure 1 and Figure 2 The wind propulsion device 1 is installed on the vessel 2 and functions as a windmill sail that receives wind to generate propulsion. In the example shown in the attached figure, one wind propulsion device 1 is installed on the forward part (bow) of the hull 3. Furthermore, the installation method of the wind propulsion device 1 (installation location and number, etc.) is not limited to the above and can be changed according to design specifications.

[0106] <Windmill Sail Main Body>

[0107] Figure 4 This is a perspective view of the windmill sail body 111 in the wind propulsion device 1 of the first embodiment.

[0108] Refer to together Figure 4 The wind propulsion device 1 has a rotation axis RC that extends vertically from the hull 3. Figure 4 The windmill sail body 111, which rotates around the single-dot dashed line shown, is a windmill sail body 111. The windmill sail body 111 has an assembly 4, which is composed of rotating bodies 20A and 20B that are capable of rotating around the axis RC, and multiple plate-shaped blades 10A to 10I that are respectively fixed to the rotating bodies 20A and 20B.

[0109] The rotating bodies 20A and 20B each have a frame portion 21 formed in an annular shape around the rotation axis RC, and are configured to rotate around the rotation axis RC. In the example shown in the figure, the rotating bodies 20A and 20B are configured to include a lower plate 20A for fixing the lower ends of a plurality of blades 10A to 10I and an upper plate 20B for fixing the upper ends of the plurality of blades 10A to 10I.

[0110] Multiple blades 10A to 10I are fixed to the frame 21, arranged parallel to the imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis RC. The multiple blades 10A to 10I include a center blade 10A whose imaginary straight line connecting the two ends of each blade passes through the center of the frame 21. The multiple blades 10A to 10I are configured such that their two ends lie on an imaginary circle centered on the rotation axis RC. The axial direction along the rotation axis RC is vertical.

[0111] When viewed from the vertical direction, the blades on the center side of the frame portion 21 among the multiple blades 10A to 10I are configured such that the length of the imaginary straight line is more than half the diameter of the frame portion 21. In the example shown in the attached figure, the blades on the center side of the frame portion 21 among the multiple blades 10A to 10I are the outermost blades among the multiple blades 10A to 10I. The length of the imaginary straight line is the length from one end of the blade to the other, also known as the chord length. The chord length of the outermost blade among the multiple blades 10A to 10I may also be less than half the diameter of the frame portion 21 (the imaginary circle centered on the rotation axis RC). Furthermore, the chord length of the multiple blades 10A to 10I is not limited to the above and can be changed according to design specifications.

[0112] In the example shown in the attached figure, the frame portion 21 (an imaginary circle centered on the axis of rotation RC) is a perfect circle when viewed from the vertical direction. Furthermore, the shape of the imaginary circle when viewed from the vertical direction is not limited to the above; it can also be an ellipse, an oblong shape, or a closed loop formed by connecting curves.

[0113] The rotating bodies 20A and 20B also have propeller-shaped beams 22 that are connected at both ends to the inner periphery of the frame 21 and connect multiple blades 10A to 10I to each other. In the example shown in the attached figure, the beams 22 pass through the center of the frame 21 and are connected at both ends to the inner periphery of the frame 21. One beam 22 is provided on each of the lower plate 20A and the upper plate 20B. In addition, the shape (number and arrangement, etc.) of the beams 22 is not limited to the above and can be changed according to design specifications.

[0114] The center blade 10A is configured such that the imaginary straight line connecting the two ends passes through the center of the frame 21. The center blade 10A is a closed section in the cross-sectional view (a cross-sectional view intersecting the axis of rotation RC). In the example shown in the figures, the center blade 10A has a hollow structure. Alternatively, the center blade 10A may also have a solid structure.

[0115] Viewed from the vertical, the central blade 10A comprises a central post 71 disposed at the center of the frame portion 21 and a resin blade body 70 disposed to cover the central post 71. The central post 71 is coaxial with the rotation axis RC. The blade body 70 is made of, for example, FRP (Fiber Reinforced Plastics). Alternatively, the blade body 70 may be made of metal, wood, other resins, or a composite material of wood and resin.

[0116] In the example shown in the attached figure, the multiple blades 10A to 10I, including the central blade 10A, are made of FRP (resin). Alternatively, the blades other than the central blade 10A may be made of cloth, with only the central blade 10A being made of FRP (resin).

[0117] Of the multiple blades 10A to 10I, the blades 10B to 10I, excluding the central blade 10A, are curved radially outward relative to an imaginary straight line. In other words, when viewed from the vertical direction, the blades 10B to 10I, which are located outside the central blade 10A, are formed into an arched shape, curving radially outward relative to the imaginary straight line of each blade. In the example shown in the attached figure, the eight blades 10B to 10I, excluding the central blade 10A, are formed into an arched shape. Alternatively, the blades 10B to 10I, excluding the central blade 10A, may also be without an arch (elliptical shape or thin).

[0118] exist Figure 4 In the example above, assembly 4 is a single layer, but it is not limited to the above; the number of layers in assembly 4 can be changed according to design specifications. Figure 1 In the example, multiple (e.g., three) assemblies 4A to 4C are arranged along the vertical direction. For example, when there are multiple assemblies 4, such as A and B, the rotating bodies 20A and 20B of assemblies 4A and 4B can be shared. For example, the arrangement of rotating bodies 20A and 20B relative to the multiple assemblies 4 can be changed according to design specifications. Furthermore, assemblies A and B of 4 can be of the same shape, and rotating bodies 20A and 20B can be bolted or welded together.

[0119] Figure 5 This is a perspective view of the first position of the multiple blades 10A to 10I in the wind propulsion device of the first embodiment, viewed from above. Figure 6 This is a perspective view of the second position of the multiple blades 10A-10I in the wind propulsion device of the first embodiment, viewed from above. Figure 5 and Figure 6 The diagrams of the upper frame and other components that make up the assembly are omitted.

[0120] Refer to together Figure 5 and Figure 6 The multiple blades 10A to 10I are twisted in such a way that the first imaginary straight line connecting the two ends of each of the multiple blades 10A to 10I at the first position on the axis of rotation RC (the single-dotted line shown in the attached figure) (the first imaginary straight line FL1 of the center blade 10A is shown in the attached figure) intersects the second imaginary straight line connecting the two ends of each of the multiple blades 10A to 10I at the second position on the axis of rotation RC, which is different from the first position (the second imaginary straight line FL2 of the center blade 10A is shown in the attached figure) when viewed from the vertical direction.

[0121] In the example shown in the attached figure, the nine blades are twisted in such a way that the first imaginary straight line FL1 at the first position on the rotation axis RC and the second imaginary straight line FL2 at the second position on the rotation axis RC intersect when viewed from the vertical direction. In other words, the nine blades are twisted in such a way that the cross section of each blade orthogonal to the vertical direction is the same at any position on the rotation axis RC. Furthermore, the twisting shape (etc.) of the multiple blades 10A to 10I is not limited to the above and can be changed according to design specifications.

[0122] <Comparison of the effects of leaf quantity>

[0123] Figure 7 This is a comparison chart of the effects of the number of blades (lift, drag, rotational force).

[0124] like Figure 7 As shown, shapes with 5, 7, 9, 11, and 13 blades were created using a mesh (finite element model), and the effects of different blade numbers (lift, drag, and rotational force) were analyzed and compared. The results confirm that the optimal number of blades is found at the midpoint. Specifically, lift is maximized with 11 blades, drag with 7 blades, and rotational force with 11 blades. Furthermore, the number of blades at which lift and drag reach their maximum varies depending on factors such as the size of the windmill sail and the thickness of the blades.

[0125] <Comparison of the effects of leaf shapes>

[0126] Figure 8 This is a comparison chart of the effects of blade shape (lift, drag, rotational force). Figure 8 In the diagram, a cylinder is shown at the center of rotation along the axis of rotation.

[0127] like Figure 8As shown, elliptical blades, a first arched shape, and a second arched shape were fabricated using a mesh (finite element model). The effects of the blade shapes (lift, drag, and rotational force) were compared through analysis. The second arched shape is a blade shape with a greater curvature than the first arched shape. The results confirm that the arched shape increases lift but decreases rotational force.

[0128] <Comparison of the effects of central blades>

[0129] Figure 9 This is a comparison chart of the effects of the central blades (lift, drag, rotational force).

[0130] like Figure 9 As shown, shapes with no center, a circular center blade, a thin center blade, a thick center blade, and only a center blade were created using a mesh (finite element model). The effects of the center blade (lift, drag, and rotational force) were compared through analysis. The analysis conditions were set as follows: dimensions: diameter of the windmill sail body 4m, height 40m; wind speed: 10m / s; fixed rotation of the windmill sail 54rpm. The results show that the shape with a thin center blade is optimal (lift, drag, and rotational force are all at their maximum values).

[0131] <Effects>

[0132] As explained above, the wind propulsion device 1 of this embodiment is a wind propulsion device installed on a ship 2 and generating propulsion force by receiving wind. The wind propulsion device 1 includes: rotating bodies 20A and 20B, each having a frame portion 21 formed in an annular shape around a rotation axis RC, and capable of rotating around the rotation axis RC; and a plurality of blades 10A to 10I, which are respectively fixed to the frame portion 21 and arranged to be parallel to the imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis RC. The plurality of blades 10A to 10I includes a center blade 10A whose imaginary straight line connecting the two ends of each blade passes through the center of the frame portion 21.

[0133] According to this structure, by having a central blade 10A at the center of the frame portion 21, the aerodynamic characteristics are improved compared to the case where there is nothing at the center of the frame portion 21 or a cylinder is provided.

[0134] In this embodiment, the central blade 10A is a closed section in the cross-sectional view.

[0135] According to this structure, the stiffness is improved compared to the case where the central blade 10A has an open section in the cross-sectional view.

[0136] When viewed from the vertical direction, the central blade 10A of this embodiment includes: a central post 71, which is disposed at the center of the frame portion 21; and a blade body 70, which is made of resin and is disposed to cover the central post 71.

[0137] According to this structure, compared with the case where the central blade 10A is made of cloth, it is possible to achieve a high-precision blade shape, thus improving aerodynamic characteristics.

[0138] In this embodiment, the blades 10B to 10I, other than the central blade 10A, are bent radially outward relative to an imaginary straight line.

[0139] According to this structure, lift is increased compared to cases where the blades other than the central blade 10A are non-arched (elliptical).

[0140] The rotating bodies 20A and 20B in this embodiment also have a propeller-shaped beam 22 that is connected to the inner periphery of the frame 21 at both ends and connects multiple blades 10A to 10I to each other.

[0141] According to this structure, the aerodynamic characteristics are improved compared to the case where multiple blades 10A~10I are connected to each other by crossbars.

[0142] In this embodiment, the multiple blades 10A~10I are configured such that both ends are located on an imaginary circle centered on the axis of rotation RC.

[0143] According to this structure, the thrust is increased relative to the area occupied by the blades.

[0144] In the wind propulsion device 1 of this embodiment, when viewed from the vertical direction, the blades on the center side of the frame portion 21 among the plurality of blades 10A to 10I are configured such that the length of the imaginary straight line is more than 1 / 2 of the diameter of the frame portion 21.

[0145] This structure amplifies the acceleration and deceleration effects of the wind ahead and behind, and enhances the propulsion relative to the blade's surface area through the Magnus effect.

[0146] In this embodiment, the multiple blades 10A to 10I are twisted in such a way that the first imaginary straight line FL1 connecting the two ends of each of the multiple blades 10A to 10I at the first position on the rotation axis RC intersects with the second imaginary straight line FL2 connecting the two ends of each of the multiple blades 10A to 10I at the second position on the rotation axis RC, which is different from the first position, when viewed from the vertical direction.

[0147] According to this structure, multiple blades 10A~10I are twisted in the vertical direction, thus generating airflow in the vertical direction. Therefore, induced drag (e.g., the effect of aspect ratio) can be reduced, thereby improving propulsion efficiency.

[0148] <Second Implementation Method>

[0149] The wind propulsion device 201 of the second embodiment will be described below. In the following description, parts having the same functions as those described in the first embodiment will be labeled with the same names and reference numerals, and specific descriptions related to those functions will be omitted.

[0150] Figure 10 This is a perspective view of the wind propulsion device 201 according to the second embodiment. Figure 11 This is a schematic diagram showing the center blade 210A of the wind propulsion device 201 in the second embodiment.

[0151] Refer to together Figure 10 and Figure 11 In the wind propulsion device 201 of the second embodiment, when viewed from the vertical direction, the central blade 210A has: a central column 71, which is provided at the center of the frame portion 21; a pair of support columns 72, which are provided at both ends of an imaginary straight line; and a blade body 270, which is composed of a cloth stretched on the pair of support columns 72 and the central column 71.

[0152] The rotating bodies 20A and 20B may also have a crossbar 222 (a rod-shaped beam) that connects to the inner periphery of the frame 21 at both ends and connects the multiple blades 210A to 210I to each other. The rotating bodies 20A and 20B may also have multiple lines 223 (tension structures) that connect to the frame 21 and support the multiple blades 210A to 210I respectively. The blades 210B to 210I other than the central blade 210A may also be made of fabric stretched on the frame 21 and the lines 223.

[0153] In the example shown in the attached figure, the central pillar 71 is formed into a cylindrical shape. The pair of support pillars 72 are each formed into a cylindrical shape with a diameter smaller than that of the central pillar 71. The pair of support pillars 72 are formed into the same shape. The central blade 210A is rhomboid in shape when viewed from the vertical direction. Furthermore, the form (number, structure, and shape, etc.) of the plurality of blades 210A to 210I, including the central blade 210A, is not limited to the above and can be changed according to design specifications.

[0154] When viewed from a vertical direction, the central blade 210A of this embodiment includes: a central post 71 disposed at the center of the frame portion 21; a pair of support columns 72 disposed at both ends of an imaginary straight line; and a blade body 270 composed of a cloth stretched over the pair of support columns 72 and the central post 71.

[0155] According to this structure, the manufacturing cost is reduced compared to the case where the central blade 210A is made of FRP.

[0156] <Third Implementation Method>

[0157] The wind propulsion device of the third embodiment will now be described. In the following description, parts having the same functions as those described in the second embodiment will be labeled with the same names and reference numerals, and specific descriptions related to those functions will be omitted.

[0158] Figure 12 This is a schematic diagram showing the center blade 310A of the wind propulsion device in the third embodiment.

[0159] like Figure 12 As shown, in the wind propulsion device of the third embodiment, when viewed from the vertical direction, the central blade 310A includes: a pair of support columns 72, which are disposed at both ends of an imaginary straight line; and a blade body 370, which is composed of a cloth stretched on the pair of support columns 72.

[0160] In the example shown in the attached figure, the central blade 310A does not have a central column 71. A pair of columns 72 are formed in a cylindrical shape. The pair of columns 72 are formed in the same shape. The arrangement of the central blade 310A forms an I-shape (a straight line) when viewed from the vertical direction. Furthermore, the form (number, structure, and 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.

[0161] When viewed from a vertical direction, the central blade 310A of this embodiment includes: a pair of support columns 72 disposed at both ends of an imaginary straight line; and a blade body 370, which is composed of a cloth stretched on the pair of support columns 72.

[0162] According to this structure, compared with the case where the central blade 310A has a central column 71, the weight and manufacturing cost of the wind propulsion device are reduced.

[0163] <Fourth Implementation Method>

[0164] The wind propulsion device 401 of the fourth embodiment will be described below. In the following description, parts having the same functions as those described in the first embodiment will be labeled with the same names and reference numerals, and specific descriptions related to those functions will be omitted.

[0165] Figure 13 This is a diagram showing the wind propulsion device 401 of the fourth embodiment viewed from a vertical direction.

[0166] like Figure 13 As shown, in the wind propulsion device 401 of the fourth embodiment, the plurality of blades 410A to 410I are blades extending 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 material other than the rigid body.

[0167] The frame 21 is made of a material with higher stiffness than the blades 10A-10I. The frame 21 may be made of, for example, metal, resin (e.g., FRP), wood, or at least two of these composite materials. The multiple blades 10A-10I may be made of, for example, fabric.

[0168] Multiple blades 410A~410I are configured such that, when viewed from the vertical direction, they are linearly symmetrical with respect to a centerline CL1 that passes through the rotation axis RC and is parallel to an imaginary straight line. Multiple blades 410A~410I are configured such that, when viewed from the vertical direction, they are linearly symmetrical with respect to a centerline CL2 that passes through the rotation axis RC and is orthogonal to an imaginary straight line.

[0169] In this embodiment, the frame 21 is made of a rigid body. The multiple blades 410A to 410I are made of materials other than the rigid body.

[0170] According to this structure, the manufacturing cost is reduced compared to the case where multiple blades 410A~410I are made of rigid bodies (e.g., FRP).

[0171] In this embodiment, the multiple blades 410A~410I are configured to be linearly symmetrical with respect to the center line CL1 that passes through the center of the frame portion 21 and is parallel to an imaginary straight line when viewed from the vertical direction.

[0172] According to this structure, the center of gravity does not change even when rotating, thus suppressing the centrifugal force applied to the ship 2.

[0173] In this embodiment, the multiple blades 410A~410I are configured to be linearly symmetrical with respect to the center line CL2 that passes through the center of the frame portion 21 and is orthogonal to an imaginary straight line when viewed from the vertical direction.

[0174] According to this structure, the characteristics of the thrust obtained remain unchanged regardless of which direction the blade rotates, thus allowing the rotation direction to be changed accordingly to propel the blade.

[0175] <Variation Example>

[0176] Furthermore, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0177] The following describes other examples (modifications) of a moving body equipped with the wind propulsion device of the above-described embodiment. Ship sails, airplane wings, rotor blades, windmill blades, etc., all generate lift, and the present invention, which generates large lift (Magnus force) while simultaneously generating electricity, can be applied. For example, the structure of the above-described embodiment can also be applied to high-speed moving bodies (e.g., speedboats, automobiles, etc.). Furthermore, the wind propulsion device can also be applied to the wings of aircraft, and to airplanes, drones, flying cars, etc. Additionally, it can be used on railways where water resistance is negligible. For example, the wind propulsion device can be installed on railways running on less-utilized local lines.

[0178] The structure of a windmill sail is not limited to wind; it can also be used with other fluids. For example, it can generate electricity by moving a ship across an ocean current (ocean current power generation). Although ocean currents are relatively slow, they are denser than air. The Kuroshio Current has a speed of about 2 meters per second, but considering its density is 1000 times that of air, this is equivalent to a wind speed of 20 meters per second.

[0179] On ships, power supply is difficult, and electricity storage is limited. Therefore, factories that frequently use electricity can be built on board (factory ships). Examples include hydrogen production and aluminum electrolytic refining. In this case, electricity can be transported directly to the demand side via the ship.

[0180] For example, wind propulsion devices can be installed on railway containers. In this case, electricity can be supplied to refrigerated containers, eliminating the need for power from a pantograph. Furthermore, since it is separated from railway power, the risk of accidents can be reduced. Additionally, it can be used as a power source for the braking system of freight cars. Similarly, wind propulsion devices can be installed on truck containers, ship containers, and the like.

[0181] Alternatively, the program for implementing the functions of the control unit in the embodiments described above can be stored in a computer-readable storage medium, so that the computer system can read and execute the program stored in the storage medium to perform processing.

[0182] In addition, the term "computer system" as used here can also include operating systems (OS) or peripheral devices and other hardware.

[0183] In addition, "computer-readable storage media" refers to non-volatile memory devices that can be written, such as floppy disks, optical disks, ROM (Read Only Memory), and flash memory, as well as removable media such as DVDs (Digital Versatile Discs) and hard drives built into computer systems.

[0184] Furthermore, "computer-readable storage media" also includes information processing devices that transmit programs via networks such as the Internet or communication lines such as telephone lines, and volatile memory (such as DRAM) inside a computer system that serves as a client, which holds programs for a certain period of time.

[0185] Furthermore, the aforementioned program can also be transmitted from a computer system storing the program in a storage device or the like to other computer systems via a transmission medium or through transmission waves in the transmission medium. Here, "transmission medium" for transmitting the program refers to a medium that has the function of transmitting information, such as a network (communication network) like the Internet or a communication line (communication line) like a telephone line.

[0186] Furthermore, the program described above can also be used to implement a portion of the functions described above. Moreover, the program described above can also be a program that can implement the functions described above by combining it with programs already stored in the computer system, i.e., a so-called differential file (differential program).

[0187] Furthermore, without departing from the spirit of the present invention, the constituent elements in the above embodiments can be replaced with known constituent elements. Additionally, the various modifications described above can also be combined.

[0188] In the embodiments disclosed in this specification, a component consisting of multiple objects can also be integrated into one object; conversely, a component consisting of a single object can be divided into multiple objects. Whether integrated or not, it is acceptable as long as the configuration achieves the purpose of the invention.

[0189] In the embodiments disclosed in this specification, components with multiple functions distributed can also have some or all of those functions centrally arranged; conversely, components with multiple functions centrally arranged can also have some or all of those functions distributed. Whether the functions are centrally arranged or distributed, it is acceptable as long as the configuration achieves the purpose of the invention.

Claims

1. A wind-powered propulsion device, disposed on a moving body, which receives wind to generate propulsion, wherein, The wind propulsion device includes: A rotating body having a frame portion formed in an annular shape around a rotation axis, and capable of rotating around said rotation axis; and Multiple blades are fixed to the frame and arranged to be parallel to the imaginary straight line connecting the two ends of each blade in a direction orthogonal to the axis of rotation. The plurality of blades includes a central blade through the center of the frame, with an imaginary straight line connecting the two ends of each blade.

2. The wind propulsion device according to claim 1, wherein, The central blade is a closed section when viewed in a cross section that intersects the axis of rotation.

3. The wind propulsion device according to claim 1, wherein, The frame is made of a rigid body. The multiple blades are made of materials other than rigid bodies.

4. The wind propulsion device according to claim 1 or 2, wherein, When viewed axially along the axis of rotation, the central blade has: A central post, which is located at the center of the frame portion; and The blade body, which is made of resin, is arranged to cover the central column.

5. The wind propulsion device according to claim 1 or 2, wherein, When viewed axially along the axis of rotation, the central blade has: A central column is located at the center of the frame portion; A pair of pillars, positioned at both ends of the imaginary straight line; and The blade body is composed of a cloth stretched on the pair of support pillars and the central pillar.

6. The wind propulsion device according to claim 1 or 2, wherein, When viewed axially along the axis of rotation, the central blade has: A pair of pillars, positioned at both ends of the imaginary straight line; and The blade body is composed of a cloth stretched on the pair of supports.

7. The wind propulsion device according to any one of claims 1 to 3, wherein, The blades other than the central blade of the plurality of blades are bent radially outward relative to the imaginary straight line.

8. The wind propulsion device according to any one of claims 1 to 3, wherein, The rotating body also has a propeller-shaped beam whose two ends are connected to the inner periphery of the frame and which connects the plurality of blades to each other.

9. The wind propulsion device according to any one of claims 1 to 3, wherein, The plurality of blades are configured such that both ends are located on an imaginary circle centered on the axis of rotation.

10. The wind propulsion device according to any one of claims 1 to 3, wherein, The plurality of blades are configured to be linearly symmetrical with respect to a centerline that passes through the center of the frame and is parallel to the imaginary straight line when viewed from the axial direction along the axis of rotation.

11. The wind propulsion device according to any one of claims 1 to 3, wherein, The plurality of blades are configured to be linearly symmetrical with respect to a centerline passing through the center of the frame and orthogonal to the imaginary straight line when viewed axially along the axis of rotation.

12. The wind propulsion device according to any one of claims 1 to 3, wherein, When viewed axially along the axis of rotation, the blade closest to the center of the frame is configured such that the length of the imaginary straight line is more than 1 / 2 of the diameter of the frame.

13. The wind propulsion device according to any one of claims 1 to 3, wherein, The plurality of blades are twisted in such a way that a first imaginary straight line connecting the two ends of each of the plurality of blades at a first position on the axis of rotation intersects a second imaginary straight line connecting the two ends of each of the plurality of blades at a second position on the axis of rotation, which is different from the first position, when viewed from the axial direction along the axis of rotation.

Images