Point suction type double-buoy wave power generation device with external generator

Abstract

The point suction type double-buoy wave power generation device comprises a magnetic motor, a rotor of the magnetic motor and an inner buoy are kept static relatively, the upper portion of the hollow inner buoy is movably arranged in an outer buoy, a stator and the outer buoy are static relatively, and the rotor is rotationally arranged in an inner hole of the stator; the rotor penetrates through an inner hole of the rotor, an air gap is formed between the rotor and the rotor, a damping disc is fixed to the bottom face of the inner buoy, the inner buoy is moored in a sea area through sinking stones, the outer buoy can do vertical linear reciprocating motion along with waves, the rotor and the rotor can generate a spiral magnetic field, and the rotor is driven to rotate through magnetic field coupling. Therefore, the rotor cuts magnetic induction lines to generate electric energy. According to the wave energy power generation device, friction between parts is avoided, and the thrust density and the wave energy conversion efficiency of the wave energy power generation device are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power generation device design, and in particular relates to a point-suction double-buoy wave energy power generation device with an external generator. Background Art

[0002] Wave energy is a type of marine renewable energy. It is clean and pollution-free, has huge reserves and high resource utilization rate. Developing wave energy can reduce dependence on traditional fossil energy and reduce energy supply risks. It is of great significance to optimizing energy structure, protecting the environment and promoting marine economic development.

[0003] The basic principle of wave energy technology is: wave energy generally undergoes three levels of energy conversion from capture to power generation. The first level is to convert the energy contained in the waves into the energy required by the transmission system through the movement of the energy capture mechanism under the waves. The second level is to convert the energy captured by the energy capture mechanism into the energy form required by the generator through the transmission system. The third level is to output the energy in the form of electrical energy through generators and other equipment. Different forms of wave energy generation devices have different technical principles. According to the different energy capture mechanisms of the device, wave power generation devices can be divided into oscillating water column type, attenuation type, cutoff type, point suction type, etc.

[0004] The advantage of the oscillating water column wave energy power generation device is that the power generation part is isolated from the seawater and is not easy to corrode, but the deployment location is limited and it is only suitable for offshore, and the conversion efficiency is low. The attenuation wave energy power generation device has a slender structure and is placed along the direction of wave propagation. It can absorb wave energy over a large area, but it uses hydraulic means to transfer energy, has a short lifespan, and has high maintenance costs. The cut-off wave energy power generation device has good output stability, efficiency, and reliability, but it is large in scale and has the problem of difficulty in construction. The point suction wave energy power generation device is small in size, has high power generation efficiency, low construction cost, is easy to transport, can be deployed offshore, has many application scenarios, and has good development prospects, but generally has low power generation.

[0005] The IEEE Transactions on Applied Superconductivity, 29(5): 1-5, 2019 (Research on Primary Excitation Fully Superconducting Linear Generators for Wave Energy Conversion) introduces a direct-drive wave energy conversion device based on a linear generator. In the device, the waves drive the outer buoy to move in a straight line, and the outer buoy drives the linear generator to generate electricity, converting wave energy into electrical energy. However, due to the low thrust density and end effect of the linear generator, the conversion efficiency of the direct-drive wave energy conversion device is low, especially at low direct drive speeds, and low power density is unavoidable. Its linear generator is installed in the inner buoy, which is difficult to disassemble, inconvenient for maintenance and cable line layout. Summary of the invention

[0006] Purpose of the Invention

[0007] In view of the problem of low power density caused by low direct drive speed in the existing wave energy power generation device technology, the present invention provides a point suction double-buoy wave energy power generation device with an external generator.

[0008] Inventing technical solutions

[0009] A point-suction double-buoy wave energy power generation device with an external generator comprises a magnetic motor, a mover of the magnetic motor remains relatively still with an inner buoy, the upper part of the hollow inner buoy is movably arranged in the outer buoy, the stator and the outer buoy are relatively still, the rotor is rotatably arranged in the inner hole of the stator, the mover passes through the inner hole of the rotor and there is an air gap between the mover and the rotor, a damping disk is fixed to the bottom surface of the inner buoy, the inner buoy is moored in the sea area by sinking stones, the outer buoy can make vertical linear reciprocating motion with the waves, the mover and the rotor can generate a spiral magnetic field, and the rotor is driven to rotate through magnetic field coupling, so that the rotor cuts magnetic flux lines to generate electrical energy.

[0010] Preferably, the outer buoy comprises a cylindrical inner cylinder and an outer cylinder having a cavity surrounding the inner cylinder, and the upper part of the inner buoy is arranged in the inner cylinder.

[0011] Preferably, the stator is fixed in the casing, the two ends of the casing are respectively fixed on the upper end cover and the lower end cover, the upper and lower ends of the stator are respectively sealed by the upper end cover and the lower end cover, and the lower end cover is fixed on the top of the outer buoy.

[0012] Preferably, the lower part of the lower end cover is threadedly connected with an upper mounting plate, a middle mounting plate, and a lower mounting plate in sequence from top to bottom, the middle mounting plate is connected to the outer buoy, and the bull's eye bearing is embedded in the upper mounting plate and the lower mounting plate, and its universal ball faces the middle mounting plate.

[0013] Preferably, a lower buoy with a cavity is fixed at the lower part of the inner buoy.

[0014] Preferably, it also includes a shield, which is fixed on the outer buoy and allows the exposed part of the magnetic motor to be located in a closed space.

[0015] Preferably, the lower part of the mover is connected to a spherical bearing, the spherical bearing is arranged in a connecting seat, and the connecting seat is fixed on the inner buoy.

[0016] Preferably, a limiting flange and a limiting baffle are fixed around the outer circumferential surface of the inner buoy, and a plurality of connecting rods pass through the limiting flange and the limiting baffle to connect the outer buoy.

[0017] Preferably, it also includes an electronic control module or a battery that can store the electrical energy generated by the magnetic motor.

[0018] Preferably, when in use, the magnetic motor is entirely located above the water surface.

[0019] Advantages of the present invention:

[0020] 1. In a point-suction double-buoy wave energy power generation device with an external generator disclosed in the present invention, the magnetic motor assembly can convert the low-speed linear motion of the outer buoy into the high-speed rotational motion of the rotor without contact, complete the motion of cutting magnetic flux lines, and realize the conversion of wave energy into electrical energy. Due to the contactless motion conversion, the friction between parts is avoided, and the thrust density and wave energy conversion efficiency of the wave energy power generation device are improved.

[0021] 2. Placing the generator externally can reduce the waterproof sealing requirements of the inner buoy; it is convenient to arrange the cables, and the cables can be directly electrically connected to the electronic control module or battery; there is more space in the outer buoy, which is convenient for arranging sensors; it can simplify the structure, facilitate the observation and maintenance of the generator operation process, and facilitate the arrangement of cables, thereby improving the efficiency of the maintenance of the wave energy device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a point-suction double-buoy wave energy power generation device with an external generator provided by the present invention.

[0023] Figure 2 It is a cross-sectional view of a point-suction double-buoy wave energy power generation device with an external generator.

[0024] Figure 3 It is a cross-sectional view of the magnetic motor in the present invention.

[0025] Figure 4 It is a schematic diagram of the external structure of the magnetic motor in the present invention.

[0026] Figure 5 It is a structural schematic diagram of the outer buoy in the present invention.

[0027] Figure 6 It is a structural schematic diagram of the inner buoy in the present invention.

[0028] In the figure: 1, magnetic motor; 2, outer buoy; 3, inner buoy; 4, shield; 5, sinker; 11, mover; 12, rotor; 13 stator; 14, upper end cover; 15, casing; 16, lower end cover; 17, upper mounting plate; 18, middle mounting plate; 19, lower mounting plate; 110, bull's eye bearing; 111, spherical bearing; 112, connecting seat; 21, outer end flange; 22, inner wall of outer buoy; 23. Reinforcement ribs; 24. Upper cover of outer buoy; 25. Wall of outer buoy; 26. Upper flange; 27. Equipment compartment; 28. Lower cover of outer buoy; 29. ​​Lower flange; 31. Inner end flange; 32. Wall of inner buoy; 33. Limit flange; 34. Limit baffle; 35. Lower buoy; 36. Reinforcement ribs of damping disc; 37. Damping disc; 38. Connecting rod; 41. Shield cover; 42. Casing; 43. Shield flange. DETAILED DESCRIPTION

[0029] The present invention is achieved through the following technical solutions.

[0030] A point suction type double-buoy wave energy power generation device with an external generator comprises a magnetic motor 1, an outer buoy 2, an inner buoy 3, a shield 4 and a sinker 5.

[0031] The mover 11 of the magnetic motor 1 is mounted on the inner end flange 31 of the inner buoy 3 through a connecting component, and the rotor 12, stator 13, upper end cover 14, housing 15, and lower end cover 16 of the magnetic motor 1 are mounted on the outer end flange 21 of the outer buoy 2 through a connecting component. The diameter of the inner buoy wall 32 is designed to be smaller than the diameter of the outer buoy inner wall 22, so the upper end of the inner buoy 3 can be inserted into the outer buoy inner wall 22 of the outer buoy 2. The shield 4 is mounted on the outer end flange 21 of the outer buoy 2 by bolts. The sinker 5 is connected to the damping disc reinforcement rib 36 in the inner buoy 3 by an anchor chain.

[0032] The magnetic motor 1 includes a mover 11 , a rotor 12 , a stator 13 , an upper end cover 14 , a housing 15 , a lower end cover 16 , an upper mounting plate 17 , a middle mounting plate 18 , a lower mounting plate 19 , a bull's eye bearing 110 , a spherical bearing 111 , and a connecting seat 112 .

[0033] The stator 13 is fixed in the casing 15 and sealed by an upper end cover 14 and a lower end cover 16 at the top and bottom. The rotor 12 is installed inside the stator 13 and is movably connected to the stator 13, the upper end cover 14 and the lower end cover 16. The rotor 12 generates electricity by cutting magnetic lines during its rotation around the axis.

[0034] The lower end cover 16, the upper mounting plate 17, the middle mounting plate 18 and the lower mounting plate 19 are fixed on the outer end flange 21 of the outer buoy 2 by screw connection; the bull's eye bearing 110 is embedded in the upper mounting plate 17 and the lower mounting plate 19, and its universal ball faces the middle mounting plate 18, which can play a vibration-absorbing role and reduce friction and wear at the installation of the magnetic motor.

[0035] The mover 11 and the rotor 12 are magnetic and can generate a spiral magnetic field. They are coaxial and have an air gap between them, and can convert linear motion and rotational motion into each other through magnetic field coupling. The mover 11 passes through the middle of the rotor 12 without contact. The mover 11 is fixed to the inner end flange 31 of the inner buoy 3 through a screw connection with the spherical bearing 111 and the connecting seat 112.

[0036] The outer buoy 2 is cylindrical in shape, and is welded to form a cavity by an outer end flange 21, an outer buoy inner wall 22, a reinforcing rib 23, an outer buoy upper cover 24, an outer buoy wall 25, an upper flange 26, an equipment compartment 27, an outer buoy lower cover 28, and a lower flange 29, providing buoyancy for the entire power generation device. The outer end flange 21 is provided with an interface for connecting with the middle mounting plate 18 and an interface for mounting the shield 4. In this embodiment, the outer buoy 2 is made of stainless steel or a composite material.

[0037] The inner buoy includes an inner end flange 31, an inner buoy wall 32, a limit flange 33, a limit baffle 34, a lower buoy 35, a damping disc reinforcement rib 36, a damping disc 37, and a connecting rod 38. The inner end flange 31 is provided with an interface connected to the connecting seat 112. In this embodiment, the inner buoy is made of stainless steel.

[0038] The upper end of the inner buoy wall 32 is welded to the inner end flange 31, and the lower end is welded to the damping disc 37, forming a cavity in the middle to provide buoyancy; the damping disc 37 can increase the damping effect under the action of the surrounding water body; the lower buoy 35 is welded to the inner buoy wall 32 to further provide buoyancy, and the damping disc reinforcement rib 36 is welded to the inner buoy wall 32, the lower buoy 35, and the damping disc 37 to provide strength and rigidity. The damping disc reinforcement rib 36 is provided with a through hole for easy connection with the anchor chain.

[0039] The limiting flange 33 is welded to the inner buoy cylinder wall 32, and a through hole is opened on the flange. The upper end of the connecting rod 38 passes through the limiting flange 33 and is connected to the lower flange 29 of the outer buoy by threading, and the lower end is connected to the limiting baffle 34 by threading. The limiting flange 33 can limit the radial movement of the connecting rod 38, maintain the inclination angle of the outer buoy and the inner buoy, and through the joint action with the limiting baffle 34, limit the axial relative movement range of the outer buoy and the inner buoy.

[0040] The shield 4 is welded by a shield cover 41, a shield tube 42, and a shield flange 43, and can be installed on the outer end flange 21 in a screw connection form, which can protect the magnetic motor and prevent the magnetic motor from contacting water.

[0041] In this embodiment, an electric control module or a storage battery can be installed as needed to process, output or store electric energy. The electric control module and the storage battery can be sealed and arranged in the equipment compartment 27.

[0042] The wave energy device, magnetic motor, outer buoy, inner buoy and shield are manufactured through modular production, which is convenient for land assembly and overall marine transportation and installation. After the manufacture of each module is completed, the inner and outer buoys are first docked and assembled, and then the magnetic motor is installed. After the magnetic motor is assembled as a whole, the connection seat 112 and the inner buoy are first fixed, and then the middle mounting plate 18 and the outer buoy are fixed. The shield 4 can be installed last after the equipment is debugged. When launching into the sea, the depth of the sea area must be measured first, and the anchor chain of appropriate length must be selected and fixed to the sinker and the wave energy power generation device. The sinker must be put in first, and then the wave energy power generation device as a whole is launched into the water.

[0043] The working process of the point-suction double-buoy wave energy power generation device with an external generator disclosed in the present invention is as follows:

[0044] The wave power generation device is moored in the sea area by sinking stones. The damping disc 37 can provide resistance for the inner buoy, so that the inner buoy 3 stands stably in the water, and the outer buoy 2 starts to make low-speed vertical linear reciprocating motion with the wave swing. Since the rotor 12 and the stator 13 are fixed on the outer buoy 2 through the mounting assembly, the outer buoy 2 will drive the rotor 12 and the stator 13 to make low-speed linear reciprocating motion together. Since the mover 11 is fixed on the inner buoy 3 through the mounting assembly, the mover 11 remains relatively stationary with the inner buoy 3, but for the rotor 12 and the stator 13, the mover 11 is in a state of relative motion. The mover 11 and the rotor 12 are magnetic and can generate a spiral magnetic field. Through magnetic field coupling, the rotor 12 is driven to rotate around the axis in the stator 13, so that the rotor 13 cuts the magnetic flux lines to generate electrical energy. The generated electrical energy is transmitted to the electronic control module or the battery to process or store the electrical energy. Finally, the conversion of wave energy and electrical energy is completed.

[0045] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A point suction type double buoy wave energy power generation device with an external generator, characterized in that: The invention comprises a magnetic motor (1), wherein a mover (11) of the magnetic motor (1) and an inner buoy (3) remain relatively still, the upper part of the hollow inner buoy (3) is movably arranged in an outer buoy (2), the stator (13) and the outer buoy (2) are relatively still, the rotor (12) is rotatably arranged in the inner hole of the stator (13), the mover (11) passes through the inner hole of the rotor (12), and an air gap is provided between the mover (11) and the rotor (12), a damping disk (37) is fixed on the bottom surface of the inner buoy (3), the inner buoy (3) is moored in the sea area by sinking stones, the outer buoy (2) can make vertical linear reciprocating motion with waves, the mover (11) and the rotor (12) can generate a spiral magnetic field, and the rotor (12) is driven to rotate by magnetic field coupling, so that the rotor (13) cuts the magnetic flux lines to generate electric energy.

2. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: The outer buoy (2) comprises a cylindrical inner cylinder and an outer cylinder with a cavity surrounding the inner cylinder, and the upper part of the inner buoy (3) is arranged in the inner cylinder.

3. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: The stator (13) is fixed in the casing (15), and the two ends of the casing (15) are respectively fixed on the upper end cover (14) and the lower end cover (16). The upper and lower ends of the stator (13) are respectively sealed by the upper end cover (14) and the lower end cover (16), and the lower end cover (16) is fixed on the top of the outer buoy (2).

4. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 3, characterized in that: The lower part of the lower end cover (16) is threadedly connected with an upper mounting plate (17), a middle mounting plate (18), and a lower mounting plate (19) in sequence from top to bottom. The middle mounting plate (18) is connected to the outer buoy (2). The bull's eye bearing (110) is embedded in the upper mounting plate (17) and the lower mounting plate (19), and its universal ball faces the middle mounting plate (18).

5. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: A lower buoy (35) having a cavity is fixed at the lower part of the inner buoy (3).

6. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: It also comprises a protective cover (4), which is fixed on the outer buoy (2) and enables the exposed part of the magnetic motor (1) to be located in a closed space.

7. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: The lower part of the mover (11) is connected to a joint bearing (111), the joint bearing (111) is arranged in a connecting seat (112), and the connecting seat (112) is fixed on the inner buoy (3).

8. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: A limiting flange (33) and a limiting baffle (34) are fixed around the outer circumferential surface of the inner buoy, and a plurality of connecting rods (38) pass through the limiting flange (33) and the limiting baffle (34) to connect the outer buoy.

9. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: It also includes an electric control module or a storage battery capable of storing the electric energy generated by the magnetic motor (1).

10. A point suction type double buoy wave energy power generation device with an external generator as claimed in claim 1, characterized in that: When in use, the magnetic motor (1) is entirely located above the water surface.

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