Power generation device based on low-speed water flow energy

Abstract

The invention belongs to the technical field of renewable energy power generation, and discloses a power generation device based on low-speed water flow energy, comprising: a first generator comprising a first stator, a first rotor and a blade unit, the first stator and the first rotor being capable of rotating relative to each other; the second generator comprises a second stator and a second rotor, the second stator and the second rotor can rotate relatively, the second rotor is connected with the first generator, and the rotating axis of the first rotor is perpendicular to the rotating axis of the second rotor; water flow drives the first rotor and the first stator to rotate relative to each other through the blade units and can drive the whole first generator to rotate around the rotating axis of the second rotor so as to drive the second rotor to rotate relative to the second stator. Water flow energy can be fully utilized, the acting force of water flow on the blades is reduced, and the service life of the blades is effectively guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of renewable energy power generation, and in particular relates to a power generation device that utilizes tidal energy, ocean current energy, and low-speed water flow energy. Background Art

[0002] As a widely distributed renewable energy with great potential, traditional water turbine power generation has high requirements on water flow velocity and is not suitable for low-speed water flow environments, so low-speed water flow energy is often not fully utilized. Therefore, it is of great practical significance to develop a power generation device that can effectively utilize low-speed water flow energy. Summary of the invention

[0003] The purpose of the present invention is to provide a power generation device based on low-speed water flow energy to solve the problem that it is difficult to fully utilize the low-speed water flow energy for power generation.

[0004] The present invention is achieved through the following technical solutions: A power generation device based on low-speed water flow energy, comprising: A first generator comprises a first stator, a first rotor and a blade unit, wherein the first stator and the first rotor are capable of relative rotation; A second generator includes a second stator and a second rotor, wherein the second stator and the second rotor are capable of relative rotation, and a rotation axis of the first rotor and a rotation axis of the second rotor are arranged perpendicular to each other; The water flow drives the first rotor and the first stator to rotate relative to each other through the blade unit, and can drive the first generator as a whole to rotate around the rotation axis of the second rotor, so as to drive the second rotor to rotate relative to the second stator.

[0005] In some embodiments, the first rotor is connected to a rotor shaft, and the blade unit includes a first blade disposed on the rotor shaft.

[0006] In some embodiments, the first stator is connected to the stator shaft, the blade unit includes a second blade disposed on the stator shaft, and the first blade and the second blade are configured to enable the rotor shaft and the stator shaft to rotate in opposite directions when subjected to water flow in the same direction; A first shell is disposed outside the first stator, a first bearing is disposed between the first shell and the first stator, and the second rotor is connected to the first shell.

[0007] In some embodiments, the first blade and the second blade are spiral Savonius blades.

[0008] In some embodiments, each of the first blade and the second blade includes at least two sub-blades evenly distributed along the rotation direction thereof, and along the axial direction of the rotating shaft where the sub-blades are located, the sub-blades are inclined downward toward one side of the first shell.

[0009] In some embodiments, the tip speed ratio of the first blade and the second blade is 1.0-1.2, and the overlap ratio is 0.15-0.18.

[0010] In some embodiments, the tip speed ratio of the first blade and the second blade is 1.0, and the overlap ratio is 0.15.

[0011] In some embodiments, the first shell includes four shell units, and the four shell units can form an ellipsoid having a cavity inside; The first generator comprises a casing, the first stator and the second rotor are arranged in the casing, and the first stator and the casing are fixedly connected; The housing is arranged in a cavity of the first shell, and the first bearing is arranged between the first shell and the housing, so that the first shell and the housing are rotatably connected.

[0012] In some embodiments, the second stator is disposed on a base, a main shaft housing is disposed on the base, and the second stator and the second rotor are disposed in the main shaft housing; The first housing support is arranged at one end of the main shaft outer sleeve, and a second bearing is arranged between the first housing and the main shaft outer sleeve.

[0013] In some embodiments, a first seal is disposed between the main shaft housing and the second bearing.

[0014] In some embodiments, the second rotor support is disposed on the second stator, and a third bearing is disposed between the second rotor and the second stator.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention adopts two sets of generators, and sets the main shafts of the rotors of the two generators to be perpendicular to each other. When the water flow energy drives the rotor and stator of the first generator to rotate through the blade unit to generate electricity, it can drive the first generator to rotate around the rotation axis of the second generator, and drive the rotor of the second generator to rotate through the first generator, thereby making full use of the water flow energy.

[0016] In the direction of water flow, the water flow energy drives the first rotor and the first stator to rotate relative to each other through the blade assembly, thereby realizing power generation by the first generator. The force exerted by the water flow energy on the blade assembly in other force directions is used to drive the first generator to rotate, thereby realizing full utilization of the water flow energy, enabling it to be applied to low-speed water flow energy power generation, and reducing the force exerted by the water flow on the blades themselves, thereby effectively ensuring the service life of the blades and the device.

[0017] In the first generator of the present invention, blades are arranged on both the stator and the rotor, and the blades can simultaneously drive the stator and the rotor of the first generator to rotate in opposite directions, thereby increasing the relative rotation speed between the stator and the rotor of the first generator. When the blade rotation speed is the same, the power generation of the first generator can be doubled, so that the device can be used for power generation of low-speed water flow energy.

[0018] The present invention, by setting a connection structure between the first generator and the second generator, can ensure the overall sealing performance of the power generation device well while achieving normal operation of the first generator and the second generator, so that the power generation device can have good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structure of a power generation device according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the first blade and the second blade in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the relative arrangement relationship between the first blade and the second blade in an embodiment of the present invention.

[0023] Figure 4 for Figure 1 Structural cross-section view at point A in the middle.

[0024] Figure 5 This is a schematic structural diagram of another implementation scheme of a power generation device according to an embodiment of the present invention.

[0025] in: 10. housing, 11. first stator, 12. stator shaft, 13. first rotor, 14. rotor shaft, 15. first blade, 16. second blade, 17. first housing, 171. shell unit, 18. first bearing, 19. support sleeve; 21. a second stator, 22. a second rotor, 23. a base, 24. a main shaft housing, 25. a second bearing, 26. a first seal, 27. a third bearing. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0027] The structural form of the power generation device determines the energy utilization rate of water flow energy to a large extent. There are many structural forms of power generation devices. Usually, a device that generates electricity by using water flow whose direction is perpendicular to the rotating axis of the impeller of the power generation device is called a vertical axis power generation device. Compared with other structural forms, the vertical axis power generation device has the advantages of simple design, low generator sealing difficulty and cost, low noise, and no need to set a commutation structure.

[0028] The blades of existing vertical axis power generation devices are mostly fixed. When the water flow interacts with the lateral blades, a force is generated on the blades themselves. This part of the force is not used for power generation, resulting in the inability to fully utilize the water flow energy and also affecting the service life of the blades.

[0029] The present invention is a power generation device that can utilize low-speed water flow energy to generate electricity, generally referring to a power generation device that can utilize the flow velocity of rivers, lakes, and oceans, for example, can utilize a low-speed water flow with a flow velocity of 3.2 kph to generate electricity.

[0030] In order to solve the above problems, the power generation device of the present invention adopts two generators. The water flow can drive the blades of one of the generators to rotate, so that the generator generates electricity. At the same time, the water flow can drive the generator to rotate through the blades. The generator drives the rotor of the other generator to rotate and generate electricity while rotating, thereby fully utilizing the low-speed water flow energy. Because the blades can fully utilize the components of force in all directions generated by the water flow energy on the blades, the damage to the blades by the water flow can be effectively reduced.

[0031] In some embodiments, reference Figure 1 , a power generation device based on low-speed water flow energy, comprising: A first generator includes a first stator 11, a first rotor 13 and a blade unit, and the first stator 11 and the first rotor 13 can rotate relative to each other; The second generator includes a second stator 21 and a second rotor 22. The second stator 21 and the second rotor 22 can rotate relative to each other. The second rotor 22 is connected to the first generator, and the rotation axis of the first rotor 22 and the rotation axis of the second rotor 13 are arranged perpendicular to each other. The water flow drives the first rotor and the first stator to rotate relative to each other through the blade unit, and can drive the first generator as a whole to rotate around the rotation axis of the second rotor, so as to drive the second rotor to rotate relative to the second stator.

[0032] Two sets of generators are used and the rotation axes of the rotors of the two sets of generators are set to be perpendicular to each other. When the water flow energy drives the rotor and stator of the first generator to rotate through the blade unit to generate electricity, it can drive the first generator to rotate around the rotation axis of the rotor of the second generator to drive the rotor of the second generator to rotate, so that the first generator and the second generator can generate electricity at the same time, thereby making full use of the water flow energy. Since the force of the water flow energy on the other component directions of the blade assembly is simultaneously converted into energy to drive the generator to rotate, the force generated on the blade itself is reduced, effectively ensuring the service life of the blade.

[0033] In some embodiments, the first rotor 13 is connected to the rotor shaft 14, and the blade unit includes a first blade 15 disposed on the rotor shaft. The first blade is disposed toward the water flow direction, and the first rotor can be driven to rotate by the first blade under the action of the water flow.

[0034] In some embodiments, the first stator 11 is connected to the stator shaft 12, the blade unit includes a second blade 16 arranged on the stator shaft, and the first blade 15 and the second blade 16 are configured to make the rotor shaft and the stator shaft rotate in opposite directions when affected by water flow in the same direction.

[0035] A first housing 17 is disposed outside the first stator, a first bearing 18 is disposed between the first housing 17 and the first stator 11 , and the second rotor 11 is connected to the first housing 17 .

[0036] The first blade 15 and the second blade 16 are both spiral Savonius blades. Figure 2 The first blade and the second blade each include two relatively arranged arc-shaped sub-blades. This type of blade has good self-starting properties and has better hydrodynamic performance and power coefficient.

[0037] The rotor shaft and the stator shaft are coaxially arranged so that the first blade and the second blade are coaxially arranged 180° in opposite directions. Figure 3 The rotation direction of the arc-shaped blades of the first blade is arranged in a clockwise direction, and the rotation direction of the arc-shaped blades of the second blade is arranged in a counterclockwise direction.

[0038] The first blade and the second blade can be formed by 3D printing with photosensitive resin, so that the arc surface structure of the blade can be set arbitrarily, which facilitates the processing of the first blade and the second blade.

[0039] Blades are arranged on the first stator and the first rotor of the first generator, and the blades can simultaneously drive the first stator and the first rotor of the first generator to rotate in opposite directions, thereby increasing the relative rotation speed between the stator and the rotor of the first generator. When the blade rotation speed is the same, the power generation of the first generator can be doubled.

[0040] In some embodiments, the tip speed ratio of the first blade and the second blade is 1.0-1.2, and the overlap ratio e is 0.15-0.18, which can achieve good hydrodynamic performance, power coefficient and comprehensive performance. For example, when the tip speed ratio is 1.0 and the overlap ratio is 0.15, the device can ensure high power generation efficiency and comprehensive performance under different flow rate environments, and can well ensure the life of the power generation device.

[0041] The number of sub-blades on the first blade and the second blade can be set to 2. According to different flow velocities and power generation requirements, the number of blades can be set to 4, 6 or more, and the sub-blades are evenly arranged along the rotation centers of the first blade and the second blade.

[0042] The first blade 15, the second blade 16 and the corresponding rotating shaft may be connected by interference fit or key.

[0043] In some embodiments, the sub-blades on the first blade 15 and the second blade 16 are arranged at a certain inclination angle along the axis direction of the rotating shaft where they are located. The sub-blades of the first blade are arranged to be inclined downward toward the first shell side, and the sub-blades of the second blade are arranged to be inclined downward toward the first shell side. Figure 5 The sub-blades of the first blade are tilted toward the lower right direction, and the sub-blades of the second blade are tilted toward the lower left direction.

[0044] Each sub-blade on the first blade has the same tilt direction and the same or different tilt angles. Similarly, each sub-blade on the second blade has the same tilt direction and the same or different tilt angles. The tilt angle can be set to 5°-10°.

[0045] By setting the sub-blades of the first blade and the second blade, the first blade and the second blade will not disturb or interfere with each other when rotating, so that the water flow energy can be better utilized.

[0046] The power generation device can be arranged individually in shallow water for small-capacity power generation scenarios; it can also be arranged in an array to form a power generation system and connected to the grid to meet the needs of peak-shaving and frequency regulation and other application scenarios.

[0047] In some embodiments, reference Figure 1 and Figure 4The second stator 21 is arranged on a base 23, a main shaft sleeve 24 is arranged on the base 23, the second stator 21 and the second rotor 22 are arranged in the main shaft sleeve 24; the first housing 17 is supported and arranged at one end of the main shaft sleeve 24, and a second bearing 25 is arranged between the first housing 17 and the main shaft sleeve 24.

[0048] By providing a main shaft sleeve to form a rotational support for the first shell of the first generator, a rotational connection between the first generator and the second generator is achieved, thereby ensuring the transmission performance and transmission stability between the first generator and the second generator.

[0049] A first sealing member 26 is disposed between the main shaft housing 24 and the second bearing 25 to form a good seal between the main shaft housing and the first housing, thereby ensuring the sealing performance of the entire device.

[0050] In some embodiments, the second rotor 22 is supported on the second stator 21, and a third bearing 27 is provided between the second rotor 22 and the second stator 21. The third bearing supports the second rotor and can well ensure the stability of the rotation connection between the second rotor and the second stator.

[0051] In some embodiments, reference Figure 5 The first shell 17 includes four shell units 171. The shell unit 171 is a symmetrically cut 1 / 4 shell structure. The four shell units can form an ellipsoid with a cavity inside.

[0052] The first generator includes a casing 10 , a first stator 11 and a first rotor 13 are disposed in the casing 10 , and the first stator 11 and the casing 10 are fixedly connected.

[0053] The housing 10 is arranged in the cavity of the first housing, and the housing is fixed in the first housing through the cooperation between each housing unit and the housing. At this time, the first bearing is arranged between the first housing and the housing, so that the first housing and the housing are rotatably connected.

[0054] The first shell adopts an ellipsoidal structure with a streamlined shape, which can reduce the impact force of the water flow on the device and guide the water flow to the first blade and the second blade, thereby improving the flow capacity of the blade unit and thus improving the overall power generation efficiency of the power generation device.

[0055] A second sealing member may be provided between the first housing and the rotor shaft and the stator shaft to seal the rotation gap between the two.

[0056] Rolling bearings can be arranged between the first housing and the rotor shaft and the stator shaft to form a rotational connection and provide effective support for the rotor shaft and the stator shaft.

[0057] A support sleeve 19 may be disposed at the lower portion of the first housing, and is connected to the second rotor 22 through the support sleeve 19 . When the first housing rotates, the second rotor is driven to rotate, and the support sleeve 19 is supported on the main shaft outer sleeve 24 .

[0058] The power generation device is entirely arranged in water, a counterweight block may be arranged on the base, and the shell of the power generation device may be processed with organic glass or other weather-resistant materials to increase the service life of the device.

[0059] Generally, when the first generator is arranged on the second generator, the first generator can be arranged symmetrically with respect to the rotation axis of the second rotor, so that the second generator can be driven better. The length of the second rotor can be set as short as possible to reduce the installation height of the first generator, reduce the impact force of the water flow on the device, and improve the overall stability of the device.

[0060] The sealing structure used in the power generation device can adopt sealing methods such as labyrinth seals to ensure good sealing performance between various components.

[0061] Auxiliary devices such as trash booms can be installed outside the power generation device. The weight of the counterweight installed on the base should be greater than the weight of the power generation device to reduce the impact of water flow on the power generation device.

[0062] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A power generation device based on low-speed water flow energy, characterized in that: include: A first generator comprises a first stator, a first rotor and a blade unit, wherein the first stator and the first rotor are capable of relative rotation; A second generator comprises a second stator and a second rotor, wherein the second stator and the second rotor are capable of relative rotation, the second rotor is connected to the first generator, and the rotation axis of the first rotor and the rotation axis of the second rotor are arranged perpendicular to each other; The water flow drives the first rotor and the first stator to rotate relative to each other through the blade unit, and can drive the first generator as a whole to rotate around the rotation axis of the second rotor, so as to drive the second rotor to rotate relative to the second stator.

2. The power generation device based on low-speed water flow energy according to claim 1 is characterized in that: The first rotor is connected to a rotor shaft, and the blade unit includes a first blade arranged on the rotor shaft.

3. The power generation device based on low-speed water flow energy according to claim 2 is characterized in that: The first stator is connected to the stator shaft, the blade unit includes a second blade arranged on the stator shaft, and the first blade and the second blade are arranged to make the rotor shaft and the stator shaft rotate in opposite directions when they are acted upon by water flow in the same direction; A first shell is disposed outside the first stator, a first bearing is disposed between the first shell and the first stator, and the second rotor is connected to the first shell.

4. The power generation device based on low-speed water flow energy according to claim 3 is characterized in that: The first blade and the second blade are spiral Savonius blades.

5. The power generation device based on low-speed water flow energy according to claim 3 or 4, characterized in that: The first blade and the second blade each include at least two sub-blades evenly distributed along the rotation direction thereof, and along the axial direction of the rotation shaft where the sub-blades are located, the sub-blades are arranged to be tilted downward toward one side of the first shell.

6. The power generation device based on low-speed water flow energy according to claim 5, characterized in that: The tip speed ratio of the first blade and the second blade is 1.0-1.2, and the overlap ratio is 0.15-0.

18.

7. The power generation device based on low-speed water flow energy according to claim 5, characterized in that: The tip speed ratio of the first blade and the second blade is 1.0, and the overlap ratio is 0.

15.

8. The power generation device based on low-speed water flow energy according to claim 3 is characterized in that: The first shell includes four shell elements, and the four shell elements can form an ellipsoid with a cavity inside; The first generator comprises a casing, the first stator and the first rotor are arranged in the casing, and the first stator and the casing are fixedly connected; The housing is arranged in a cavity of the first shell, and the first bearing is arranged between the first shell and the housing, so that the first shell and the housing are rotatably connected.

9. The power generation device based on low-speed water flow energy according to any one of claims 3 or 8, characterized in that: The second stator is arranged on a base, a main shaft sleeve is arranged on the base, and the second stator and the second rotor are arranged in the main shaft sleeve; The first housing support is arranged at one end of the main shaft outer sleeve, and a second bearing is arranged between the first housing and the main shaft outer sleeve.

10. The power generation device based on low-speed water flow energy according to claim 9, characterized in that: The second rotor is supported on the second stator, and a third bearing is arranged between the second rotor and the second stator.

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