A wave energy power generation system using a double water turbine

Abstract

A wave energy power generation system using a double water turbine, comprising a floating body and an energy conversion chamber. A unidirectional rotation power generation system and a magnetic rotation acceleration system are arranged in the energy conversion chamber. Two water turbines are arranged below the floating body. The rotating shafts of the two water turbines are coaxially arranged in a loose fit, and are respectively connected to the input ends of the unidirectional rotation power generation system and the magnetic rotation acceleration system. The inclination directions of the rotating blades of the two water turbines are designed to be opposite. In this way, when the system moves up and down under the action of sea waves, the two water turbines rotate towards each other. The rotation of one water turbine accelerates the rotation of the other water turbine through the magnetic rotation acceleration system, and is transmitted to the unidirectional rotation power generation system through the rotating shaft to be converted into electric energy. Since this wave energy power generation system has two water turbines rotating towards each other, it can automatically balance the torque generated by the rotation of the water turbines and can capture greater wave energy. The system has a simple structure, strong reliability, and high energy transmission and conversion efficiency.

Description

Technical Field

[0001] The present invention relates to wave energy power generation technology, and particularly to an energy conversion system based on magnetic coupling energy transmission. Background Art

[0002] The ocean area accounts for 71% of the total area of the earth. There is huge energy contained in waves, and wave energy power generation has become a very promising new energy development direction. Although wave energy has a large reserve and a high energy flux density, waves have extremely strong randomness (irregularity) and destructiveness under extreme weather conditions, resulting in obvious problems in the reliability and power generation efficiency of wave energy power generation devices. In the initial stage of wave energy power generation development, the main method adopted was pure mechanical energy transmission. The characteristics of the energy conversion process of a pure mechanical energy transmission wave energy power generation device are: wave energy capture - mechanical energy - electrical energy. Its advantages are that there are few energy form conversions and the energy transfer efficiency is high. However, due to the irregularity of waves, the capture of this irregular energy makes the operation of the mechanical structure extremely unstable. Especially for mechanisms using gear-like energy transmission parts, it is very easy to cause damage to the mechanical structure. Currently, the most widely used and most mature wave energy power generation device is hydraulic energy transmission. The energy conversion process is: wave energy capture - hydraulic energy - mechanical energy - electrical energy. Since the hydraulic system has an energy storage and buffering structure, the irregular wave energy input can be converted into relatively stable hydraulic energy, so the stability and reliability of the entire system are enhanced. However, during the energy transfer process, there is one more conversion from mechanical energy to hydraulic energy, and the energy transmission efficiency of the hydraulic system is only about 50%, resulting in a large loss of energy in this link.

[0003] Using a water turbine for power generation is also a technology that people have studied before. The water turbine can be directly connected to a generator to drive the generator to generate electricity. However, the water turbine will rotate reciprocally during the undulation of waves, and the generator is always in a continuous change of rotation - stop - reverse rotation. This motion state greatly reduces the power generation efficiency. In order to obtain the result of the generator rotating in one direction, people have designed various methods, including the pitch control technology of the water turbine, but none of them have been well applied due to unreliability or other disadvantages.

[0004] It is precisely because of these problems existing in the prior art that wave energy still cannot compare with thermal power in terms of cost and cannot be commercialized so far. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and propose a wave energy power generation system using a double water turbine, an energy conversion system based on energy transmission, and an energy conversion system composed of structural components such as a magnetic wheel disc, an outer magnetic rotor generator, and an overrunning clutch. Through the mutual magnetic coupling action of the magnetic fields, the reciprocating rotation of the water turbine is converted into the one-way rotation of the generator, improving the energy transfer efficiency and the reliability and power generation efficiency of the wave energy power generation device.

[0006] To achieve the above object of the present invention, the present invention adopts the following technical solutions:

[0007] A wave energy power generation system using a double water turbine includes a floating body (1) and an energy conversion chamber (3). The energy conversion chamber (3) is arranged on the floating body (1) or in a floating chamber (2) inside the floating body (1). A unidirectional rotation power generation system (4) and a magnetic rotation acceleration system (5) are arranged in the energy conversion chamber (3). Two water turbine units are arranged below the floating body (1). The water turbine rotating shafts of the two water turbine units are coaxially and loosely sleeved, and are respectively connected to the input ends of the unidirectional rotation power generation system (4) and the magnetic rotation acceleration system (5), transmitting the rotation of their respective water turbines to the unidirectional rotation power generation system (4) and the magnetic rotation acceleration system (5) connected thereto respectively. The inclination directions of the rotating blades of the two water turbine units are designed to be opposite, so that the rotation directions of the two water turbines are always opposite. Under such conditions, the system moves up and down under the action of sea waves, causing the two water turbines to rotate towards each other. The rotation of one water turbine accelerates the rotation of the other water turbine through the magnetic rotation acceleration system, and at the same time, one water turbine transmits the obtained energy to the other water turbine and transmits it to the unidirectional rotation power generation system through the rotating shaft, and this system converts mechanical energy into electrical energy. Since this wave energy power generation system has two water turbines rotating towards each other, it can automatically balance the torque generated by the rotation of the water turbines and can capture greater wave energy.

[0008] According to a specific embodiment of the present invention, the unidirectional rotation power generation system (4) includes a magnetic disk (41), a guide disk (42), an outer rotor of the generator (43), a stator of the generator (44), and a frame (45). The guide disk (42) is fixed to the frame (45) and is located between the magnetic disk (41) and the outer rotor of the generator (43). Permanent magnets are arranged corresponding to each other on the disk surfaces of the outer rotor of the generator (43) and the magnetic wheel disk (41) to form a magnetic field. The north-south pole direction of the permanent magnets is parallel to the rotating shaft (9), that is, the north-south pole connection direction of the magnetic field is parallel to the rotating shaft (9). The north-south poles of the adjacent permanent magnets on each disk surface are arranged alternately. There are magnetic conductors penetrating the disk surface on the guide disk (42). The magnetic conductors are arranged symmetrically and uniformly in a circle with the same radius. The arrangement positions of the permanent magnets correspond to those of the magnetic conductors. Both the magnetic disk (41) and the outer rotor of the generator (43) are connected to the transmission shaft of one of the water turbine units through their respective overrunning clutches, so that the water turbine rotating shaft (9) only drives one of the magnetic disk (41) and the outer rotor of the generator (43) to rotate in different rotation directions. Under the magnetic coupling action of the magnetic disk (41), the guide disk (42), and the outer rotor of the generator (43), the outer rotor of the generator (43) always rotates unidirectionally when the water turbine rotating shaft (9) rotates in any direction.

[0009] According to a specific embodiment of the present invention, there is a hole (422) at the center of the disk of the guide disk (42), and the water turbine rotating shaft (9) passes through the hole without contacting it.

[0010] According to a specific embodiment of the present invention, the magnetic rotation acceleration system (5) includes two magnetic disks (51) and (53), a guide disk (52) and a frame (54). The guide disk (52) is arranged between the two magnetic disks (51) and (53) and fixed to the frame (54). Permanent magnets are arranged correspondingly on the disk surfaces of the magnetic disks (51) and (53) to form a magnetic field. The north and south pole directions of the permanent magnets are parallel to the rotating shaft (9), and the north and south poles of the adjacent permanent magnets arranged on each disk surface are alternately arranged. The magnetic conductors are arranged symmetrically and uniformly on the guide disk (52) along the circumferences with the same radius, and the arrangement positions of the permanent magnets and the magnetic conductors correspond to each other. The rotation centers of the two magnetic disks (51) and (53) are fixedly connected to the transmission shafts of the two water turbine units respectively, and only rotate reciprocally with the transmission shafts they are connected to.

[0011] According to a specific embodiment of the present invention, the number of permanent magnets arranged on the magnetic disk (51) of the magnetic rotation acceleration system (5) is greater than the number of permanent magnets arranged on the magnetic disk (53).

[0012] According to a specific embodiment of the present invention, the permanent magnets and the columnar magnetic conductors can be in any shape, and their sizes and quantities can be the same or different, and they are designed and customized according to the rotation speed of the wheel disk and the magnitude of energy transmission.

[0013] According to a specific embodiment of the present invention, the two water turbine units adopt a coaxial rotation form. The rotating shaft (7) of the water turbine (6) is a hollow rotating shaft, and the rotating shaft (9) of the water turbine (8) passes through the middle of the rotating shaft (7). The rotating shaft (9) of the water turbine (8) is directly connected to the unidirectional rotation power generation system (4), while the rotating shaft (7) of the water turbine (6) is connected to the magnetic rotation acceleration system (5).

[0014] According to a specific embodiment of the present invention, the floating body (1) has an inverted cone or inverted frustum of a cone shape.

[0015] As can be seen from the above technical solutions, the present invention designs a wave energy power generation device, which transmits torque and energy through magnetic field coupling between magnetic components, and has the characteristics of vibration isolation, no friction, no need for lubrication, simple structure and easy processing. Moreover, the energy transfer efficiency between magnetic components is high, which can improve the reliability and power generation efficiency of the wave energy power generation device at the same time. Description of the Drawings

[0016] Figure 1It is a schematic external view of a wave energy power generation system using a double water turbine disclosed by the present invention;

[0017] Figure 2 It is a schematic structural view of a wave energy power generation system using a double water turbine disclosed by the present invention;

[0018] Figure 3 It is a schematic structural view of the unidirectional rotation power generation system 4;

[0019] Figure 3A It is a front view of the magnetic disk 41, the magnetic conduction disk 42 and the magnetic disk 43;

[0020] In the figure, 412 and 432 are permanent magnets, 421 is a magnetic conductor, 422 is a circular hole in the middle of the magnetic conduction disk, and it does not contact the rotating shaft 9. 411 and 431 are overrunning clutches, and these two overrunning clutches are installed on the transmission shaft 9, and the locked rotation directions are opposite;

[0021] Figure 4 It is a schematic structural view of the magnetic rotation acceleration system 5;

[0022] Figure 4A It is a front view of the magnetic disk 51, the magnetic conduction disk 52 and the magnetic disk 53;

[0023] In the figure, 522 is a magnetic conductor on the magnetic conduction disk 52, 511 and 531 are both permanent magnets. Usually, the number of permanent magnets on the magnetic disk 51 is more than that on the magnetic disk 53. When rotating relatively, the magnetic disk 53 rotates faster. Specific embodiments

[0024] The present invention will be further described below in conjunction with the accompanying drawings and non-limiting embodiments:

[0025] Embodiment 1:

[0026] See Figure 1 and Figure 2 , this embodiment is a wave energy power generation system using a double water turbine, which is composed of a floating body (1), a floating bin (2), an energy conversion bin (3), a unidirectional rotation power generation system (4), a magnetic rotation acceleration system (5), a water turbine (6), a water turbine rotating shaft (7), a water turbine (8), a water turbine rotating shaft (9), etc.

[0027] The floating body (1) described in this embodiment adopts an inverted cone shape. This shape structure can quickly increase the buoyancy when the sea wave rises and quickly decrease the buoyancy when the sea wave drops. Therefore, the followability of the floating body moving with the wave is enhanced, making the device adapt to the irregular wave vibration, and can effectively improve the efficiency of the device absorbing wave energy.

[0028] In this embodiment, the energy conversion chamber (3) is arranged on the floating body (1). A unidirectional rotation power generation system (4) and a magnetic rotation acceleration system (5) are arranged in the energy conversion chamber (3). Two water turbines (6) and (8) are arranged below the floating body (1).

[0029] This embodiment adopts a double water turbine structure. The rotating shaft (7) of the water turbine (6) is a hollow rotating shaft. The rotating shaft (9) of the water turbine (8) passes through the middle of the rotating shaft (7). The rotating shaft (9) of the water turbine (8) is directly connected to the unidirectional rotation power generation system (4), while the rotating shaft (7) of the water turbine (6) is connected to the magnetic rotation acceleration system (5). The rotating directions of the two water turbines are designed to be always opposite. This coaxial and opposite rotation can balance the rotation torque of the water turbines and can also accelerate the rotation of the generator through magnetic coupling. Compared with the single water turbine form, the double water turbine form can improve the capture efficiency of the power generation device for wave energy.

[0030] See Figure 3 and Figure 3A In this embodiment, a unidirectional rotation power generation system (4) that realizes the conversion of the reciprocating rotation of the water turbine into the unidirectional rotation of the generator in a magnetic coupling manner is designed. It consists of a magnetic force turntable (41), a magnetic conduction disk (42), an outer rotor (43) of the generator, a stator (44) of the generator, and a frame (45). Permanent magnets are arranged corresponding to each other on the disk surfaces of the magnetic force turntable (41) and the outer rotor (43) of the generator. The permanent magnets form a magnetic field. The north and south pole directions of the permanent magnets are parallel to the rotating shaft (9). The adjacent permanent magnets arranged on each disk surface are arranged alternately in the north and south poles. The columnar magnetic conductors on the magnetic conduction disk (42) are uniformly arranged axially symmetrically along the circumference of the same radius. The shapes, sizes, and numbers of the permanent magnets and columnar magnetic conductors on the disk surface can be customized according to the rotation speed of the turntable and the magnitude of energy transmission. In this embodiment, the permanent magnets are columnar and axially magnetized. Both the magnetic force turntable (41) and the outer rotor (43) of the generator are connected to the rotating shaft (9) of the water turbine through overrunning clutches. The connection method enables the rotating shaft (9) of the water turbine to drive only one of the magnetic force turntable 41 or the outer rotor (43) of the generator to rotate in different rotating directions. The magnetic conduction disk (42) is fixed on the frame (45). There is a hole (422) in the disk. The rotating shaft (9) of the water turbine passes through the hole without contacting it. Under the magnetic coupling action of the magnetic force turntable (41), the magnetic conduction disk (42), and the outer rotor (43) of the generator, it is similar to forming a magnetic gear, so that the outer rotor (43) of the generator always rotates unidirectionally when the rotating shaft (9) of the water turbine rotates in any direction. The stator (44) of the generator is fixed to the frame and is located inside the outer rotor (43) of the generator. The two are combined to form a generator.

[0031] The power generation device moves up and down under the action of waves, thereby driving the water turbine to rotate in the water. Although a relatively high torque can be obtained due to the relatively small distance and time of the undulation, the rotational speed of the water turbine is relatively low, which is not conducive to improving the power generation efficiency of the generator. Therefore, the present invention designs a magnetic rotation acceleration system (5) acting on the water turbine (6), that is, a double water turbine structure is designed. Through magnetic coupling, the water turbine (6) will accelerate the water turbine (8), realizing the energy superposition of the two water turbines, and transmitting power to the generator through the rotating shaft (9), effectively improving the power generation efficiency.

[0032] See Figure 4 and Figure 4A , this magnetic rotation acceleration system (5) is composed of magnetic disks (51), (53), a magnetic conduction disk (52), and a frame (54). Permanent magnets are arranged correspondingly on the surfaces of the magnetic disks (51), (53). The permanent magnets form a magnetic field, and the direction of the north and south poles of the magnetic field (i.e., the direction of the north and south poles of the permanent magnets) is parallel to the rotating shaft (9). The permanent magnets arranged adjacent to each other on each disk surface are arranged in an alternating north and south pole manner. The columnar magnetic conduction bodies on the magnetic conduction disk (52) are uniformly arranged axially symmetrically around a circle with the same radius. The permanent magnets on the disk surface and the columnar magnetic conduction bodies can take any shape, and the size and quantity can be the same or different, and are customized according to the rotational speed of the disk and the magnitude of energy transmission. In this embodiment, the permanent magnets are columnar and axially magnetized. The magnetic disk (51) is fixedly connected to the rotating shaft (7) of the water turbine (6) and only rotates reciprocally with the rotating shaft (7). The magnetic conduction disk (52) is fixed on the frame (54), and there is a hole (521) in the disk. The rotating shaft (9) of the water turbine (8) passes through the hole and is fixedly connected to the magnetic disk (53) and only rotates reciprocally with the rotating shaft (9). Since the rotations of the two water turbines are always opposite, the rotations of the magnetic disks (51), (53) are always opposite. If the number of permanent magnets arranged on the magnetic disk (51) is greater than the number of permanent magnets arranged on the magnetic disk (53), the magnetic coupling effect can cause the magnetic disk (53) to rotate faster, thus playing a role in accelerating the rotating shaft (9) and transmitting energy. At the same time, the opposite rotation directions of the two water turbines can also play a role in balancing the torque.

[0033] In summary, the wave energy generation system of the double water turbines based on magnetic coupling energy transmission shown in this embodiment has a hollow rotating shaft for the water turbine (6). The rotating shaft (9) of the water turbine (8) passes through the middle of the rotating shaft (7) to achieve coaxial rotation of the two water turbines. The rotating shaft (9) of the water turbine (8) is directly connected to the unidirectional rotation power generation system (4), while the rotating shaft (7) of the water turbine (6) is connected to the magnetic rotation acceleration system (5). The rotation directions of the two water turbines are designed to be always opposite. This coaxial and opposite rotation can balance the rotation torque of the water turbines. At the bottom of the water turbine (6), after the rotating shaft (9) passes through the water turbine (6) and its rotating shaft (7), a bearing dynamic seal is installed to prevent seawater from entering. A dynamic seal is installed at the place where the rotating shaft (7) enters the bottom of the energy conversion chamber (3) to prevent seawater from entering. The energy conversion chamber (3) can be placed in the floating chamber (2). In this case, higher requirements are imposed on the sealing and leakage prevention of the equipment. The energy conversion chamber (3) can also be placed on the top of the floating chamber (2), above the water level, which can effectively prevent water leakage and corrosion of the equipment.

[0034] When the floating body (1) moves up and down under the action of waves, it also drives the water turbines (6) and (8) to move up and down, causing the water turbines (6) and (8) to rotate. The rotating shaft (9) of the water turbine (8) is directly connected to the unidirectional rotation power generation system (4). Here, the reciprocating rotation of the water turbine is converted into the unidirectional rotation of the outer rotor (43) of the generator, and the rotational energy obtained by the water turbine can be converted into electrical energy. The kinetic energy obtained by the water turbine (6) is transmitted to the water turbine (8) in a way that accelerates the rotation of the water turbine (8) through the magnetic rotation acceleration system (5). In this way, the energy obtained by the two water turbines can be converted into electrical energy, and due to the action of the magnetic rotation acceleration system (5), the rotation speed of the outer rotor (43) of the generator is increased, and the efficiency of converting electrical energy is improved.

[0035] In addition, the wave energy generation system of the present invention can use a single water turbine, remove the water turbine (6) and the rotating shaft (7), and connect the rotating shaft (9) and the unidirectional rotation power generation system (4) with a magnetic speed regulating gear to replace the magnetic rotation acceleration system (5). It can also achieve the effects of balancing torque and increasing speed. However, if the power generation device is to obtain the same amount of energy, a larger water turbine needs to be used.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A wave energy power generation system using a double water turbine, comprising a floating body (1) and an energy conversion chamber (3), wherein the energy conversion chamber (3) is arranged on the floating body (1) or in a floating chamber (2) inside the floating body (1); characterized in that, A unidirectional rotation power generation system (4) and a magnetic rotation acceleration system (5) are provided in the energy conversion chamber (3). Two water turbine units are provided below the floating body (1). The rotating shafts of the two water turbine units are coaxially arranged with clearance sleeves and are respectively connected to the input ends of the unidirectional rotation power generation system (4) and the magnetic rotation acceleration system (5) to transmit the rotation of their respective water turbine units to the unidirectional rotation power generation system (4) and the magnetic rotation acceleration system (5) they are respectively connected to; the inclination directions of the rotating blades of the two water turbine units are designed to be opposite, so that the rotating directions of the two water turbine units are always opposite; The magnetic rotation acceleration system (5) includes two magnetic discs, namely a first magnetic disc (51) and a second magnetic disc (53), a first magnetic conduction disc (52) and a first frame (54). The first magnetic conduction disc (52) is arranged between the two magnetic discs and is fixed to the first frame (54); permanent magnets are arranged corresponding to each other on the disc surfaces of the two magnetic discs. The north-south pole directions of the permanent magnets are parallel to the rotating shafts of the two water turbine units. The north-south poles of adjacent permanent magnets on each disc surface are arranged alternately. The first magnetic conduction disc (52) is axially symmetrically and evenly provided with magnetic conductors along a circle with the same radius, and the arrangement positions of the permanent magnets correspond to those of the magnetic conductors; the rotation centers of the first magnetic disc (51) and the second magnetic disc (53) are respectively fixedly connected to the rotating shafts of the two water turbine units and only rotate reciprocally with the rotating shafts they are respectively connected to. The number of permanent magnets arranged on the first magnetic disc (51) is greater than the number of permanent magnets arranged on the second magnetic disc (53).

2. The wave energy power generation system using a double water turbine according to claim 1, characterized in that, The unidirectional rotation power generation system (4) includes a third magnetic disc (41), a second magnetic conduction disc (42), an outer rotor of the generator (43), a stator of the generator (44) and a second frame (45); the second magnetic conduction disc (42) is fixed to the second frame (45) and is located between the third magnetic disc (41) and the outer rotor of the generator (43). Permanent magnets are arranged corresponding to each other on the disc surfaces of the outer rotor of the generator (43) and the third magnetic disc (41). The north-south pole directions of the permanent magnets are parallel to the rotating shafts of the water turbine units. The north-south poles of adjacent permanent magnets on each disc surface are arranged alternately. The second magnetic conduction disc (42) is provided with magnetic conductors penetrating the disc surface, and the magnetic conductors are axially symmetrically and evenly arranged along a circle with the same radius. The arrangement positions of the permanent magnets correspond to those of the magnetic conductors; both the third magnetic disc (41) and the outer rotor of the generator (43) are connected to the rotating shaft of one of the water turbine units through their respective overrunning clutches, so that the rotating shaft only drives one of the third magnetic disc (41) and the outer rotor of the generator (43) to rotate in different rotating directions. Under the magnetic coupling action of the third magnetic disc (41), the second magnetic conduction disc (42) and the outer rotor of the generator (43), the outer rotor of the generator (43) always rotates unidirectionally when the rotating shaft of the water turbine unit rotates in any direction.

3. The wave energy power generation system using a double water turbine according to claim 2, characterized in that, There is a hole (422) at the center of the disc of the second magnetic conduction disc (42), and the rotating shafts of the two water turbine units pass through the hole without contacting it.

4. The wave energy power generation system using a double water turbine according to claim 2 or 3, characterized in that, The two water turbine units include a first water turbine unit (6) and a second water turbine unit (8), which adopt a coaxial rotation form. The rotating shaft of the first water turbine unit (6) is a hollow rotating shaft, and the rotating shaft of the second water turbine unit (8) passes through the middle of the hollow rotating shaft. One end of the rotating shaft of the second water turbine unit (8) is connected to the second magnetic disk (53) of the magnetic rotation acceleration system (5), and the other end is directly connected to the unidirectional rotation power generation system (4), while the rotating shaft of the first water turbine unit (6) is connected to the first magnetic disk (51) of the magnetic rotation acceleration system (5).

5. The wave energy power generation system using a double water turbine according to claim 2 or 3, characterized in that, The floating body (1) has an inverted cone or inverted frustum of a cone shape.

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