Counter-rotating ducted current power plant

Abstract

The utility model discloses a kind of counter-rotating ducted current power generation devices, belong to marine engineering technical field, it includes power generation structure, the power generation structure is counter-rotating power generation structure, the counter-rotating power generation structure includes first power generation impeller, second power generation impeller and double-rotor generator, the first power generation impeller and the second power generation impeller are sequentially installed and rotate in opposite directions under the action of sea current, the first power generation impeller is connected with the rotating shaft of the inner rotor of double-rotor generator by first power generation input shaft, the second power generation impeller is connected with the rotating shaft of the outer rotor of double-rotor generator by second power generation input shaft. The utility model not only can improve wide flow rate adaptability, increase sea current power generation efficiency, but also can improve the capture efficiency of multidirectional sea current.

Description

Technical Field

[0001] This utility model relates to marine engineering, and in particular to a counter-rotating duct current power generation device. Background Technology

[0002] With the surge in demand for low-carbon energy, ocean energy, as a clean and stable form of renewable energy, is becoming an important direction for energy transformation. Ocean current power generation, due to its advantages of high energy density and strong regularity, has become one of the core points of ocean energy development.

[0003] Traditional single-rotor ocean current generators are limited by the matching range between the tip speed ratio and the angle of attack of the incoming flow. Their power generation efficiency drops significantly when the flow velocity fluctuates, and they are also insufficient in capturing energy from the reverse flow.

[0004] In addition, passive stall regulation or pitch mechanism control of angle of attack can effectively improve power generation efficiency. However, the reliability of pitch structure is low in deep-sea environment and may increase operation and maintenance costs. Utility Model Content

[0005] To address the problems of decreased power generation efficiency, insufficient reverse flow energy capture capability, low reliability of pitch structure, and high operation and maintenance costs in traditional single-rotor ocean current generators when the flow velocity fluctuates, this invention provides a counter-rotating duct ocean current generator that can improve ocean current power generation efficiency and ocean current energy capture efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A counter-rotating duct-type ocean current power generation device includes a power generation structure, which is a counter-rotating power generation structure. The counter-rotating power generation structure includes a primary power generation impeller, a secondary power generation impeller, and a dual-rotor generator. The primary power generation impeller and the secondary power generation impeller are installed sequentially and rotate in opposite directions under the action of the ocean current. The primary power generation impeller is connected to the inner rotor shaft of the dual-rotor generator via a primary power generation input shaft, and the secondary power generation impeller is connected to the outer rotor shaft of the dual-rotor generator via a secondary power generation input shaft.

[0008] This invention connects a primary generator impeller to the inner rotor of a dual-rotor generator and a secondary generator impeller to the outer rotor of the dual-rotor generator. The primary and secondary generator impellers are configured to rotate in opposite directions under the influence of ocean currents. During this process, the secondary generator impeller is located in the wake formed by the primary generator impeller, which increases the angle of attack of the secondary generator impeller against the current, thereby improving the power generation efficiency and increasing the ocean current capture efficiency at low current velocities.

[0009] In one embodiment, the dual-rotor generator is installed inside a nacelle, which is fixedly mounted on a support frame. A support rod is mounted on the support frame via bearings. During operation, under the influence of ocean currents, the support frame rotates around the support rod. Thus, by rotating the support frame around the support rod, the first and second stage generator impellers are always aligned with the direction of the ocean current, improving the ability to capture reverse currents.

[0010] In one embodiment, the support is streamlined to reduce ocean current resistance when the support rotates.

[0011] In one embodiment, the primary power generation input shaft and the secondary power generation input shaft are nested together to form a sleeve shaft, and the primary power generation impeller and the secondary power generation impeller are installed at a certain distance to increase the angle of attack of the secondary power generation impeller.

[0012] In one embodiment, the primary power generation impeller and the secondary power generation impeller are installed inside a duct, and the duct is an acceleration type duct.

[0013] In one embodiment, the first-stage power generation impeller and the second-stage power generation impeller have the same diameter, and the distance between the second-stage power generation impeller and the first-stage power generation impeller is equal to the radius of the power generation impeller. The number of blades in the first-stage power generation impeller is even, and the number of blades in the second-stage power generation impeller is odd.

[0014] In one embodiment, the connection between the nacelle and the shaft of the secondary generator impeller is sealed using a water-sealed baffle reinforcement structure.

[0015] In one embodiment, the conduit is a hollow acceleration type conduit, with the inner diameter of the inlet end being the largest and the inner diameter of the other end being the smallest.

[0016] In one embodiment, the gap between the duct and the primary and secondary power generation impellers is 0.05 times the impeller diameter.

[0017] In one embodiment, the outer end of the primary power input shaft is fastened to the propeller hub, and the center point of the propeller hub, the primary power input shaft, and the secondary power input shaft are located on the same straight line.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1) This invention adopts a counter-rotating power generation structure, which can improve power generation efficiency through a dual-rotor generator. Furthermore, when flow velocity conditions worsen, the sequential configuration of the first and second stage impellers in this invention results in a larger angle of attack at the second stage impeller compared to a single impeller configuration, further improving power generation efficiency. Additionally, by installing the first and second stage impellers within a hollow accelerating duct, this invention further concentrates the water flow, increasing the flow velocity at the impellers and improving the current energy capture efficiency under low-speed conditions. This solves the problem of wide flow velocity adaptability of current generators, while avoiding the reliability issues of variable pitch structures and reducing overall operation and maintenance costs.

[0020] 2) This utility model adopts a steering structure, which can change the direction of the incoming current by rotating the bracket around the support rod, thereby providing a certain reverse current capture capability, improving the power generation performance of the device under multiple sea conditions, and can also further improve the energy capture efficiency of the oblique incoming current, which has a certain economic advantage.

[0021] 3) This utility model can be equipped with an assembly locking mechanism at the lower part of the support rod to achieve stable operation of the power generation device in place. Alternatively, the support rod can be used to connect the upper horizontal truss to form an array of power generation devices. In other words, the installation mode of this utility model is flexible, the structure is simple, and it has strong site adaptability. It can also be easily disassembled and returned to the factory for maintenance and modification, saving the later operation and maintenance construction costs of the power generation system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a system schematic diagram of an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the external structure of an embodiment of the present utility model.

[0025] Figure 3 for Figure 2 A schematic diagram of the left-side view structure.

[0026] Figure 4 This is a schematic diagram of the lower mounting and locking mechanism according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of an embodiment of the present invention, showing the upper horizontal truss installed to form a generator array.

[0028] In the picture:

[0029] 1. Duct; 2. First-stage generator impeller; 3. Second-stage generator impeller; 4. Hub; 5. Second-stage generator input shaft; 6. First-stage generator input shaft; 7. Watertight baffle reinforcement structure; 8. Dual-rotor generator; 9. Inner rotor; 10. Outer rotor; 11. Gearbox; 12. Support; 13. Bearing; 14. Support rod; 15. Output cable; 16. Nacelle; 17. Horizontal truss; 18. Parallel generator unit 1; 19. Parallel generator unit 2. Detailed Implementation

[0030] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please see Figures 1-3 An embodiment of the counter-rotating duct current power generation device of this utility model includes a nacelle 16, a counter-rotating power generation structure, a steering structure and a duct 1. The duct 1 is connected to the nacelle 16. The counter-rotating power generation structure is installed in the duct 1 and the nacelle 16, and the steering structure is installed on the nacelle 16.

[0034] Catheter 1 is a hollow acceleration type catheter, with the largest inner diameter at the inlet end and the smallest inner diameter at the outlet end, and the inner diameter gradually decreases from the inlet end to the outlet end.

[0035] The counter-rotating power generation structure includes a primary generator impeller 2, a secondary generator impeller 3, a hub 4, a gearbox 11, and a dual-rotor generator 8. The primary generator impeller 2 and the secondary generator impeller 3 are sequentially installed inside the duct 1, and the gearbox 11 and the dual-rotor generator 8 are sequentially installed inside the nacelle 16. The primary generator impeller 2 is mounted on the primary generator input shaft 6, and the outer end of the primary generator input shaft 6 is secured with the hub 4. The secondary generator impeller 3 is mounted on the secondary generator input shaft 5, and the primary generator impeller 2 and the secondary generator impeller 3 are configured to rotate only in opposite directions (this can be achieved by installing a one-way bearing, or by a method known to those skilled in the art that enables the primary generator impeller 2 and the secondary generator impeller 3 to rotate in opposite directions). The gearbox 11 is a conventional structure, which includes at least two independent input ends and at least two independent output ends. The dual-rotor generator 8 also has an existing structure (for example, it can adopt the dual-rotor generator disclosed in Chinese Patent CN106329859A, but is not limited to this type of dual-rotor generator), which includes an inner rotor 9 and an outer rotor 10. When the inner rotor 9 and the outer rotor 10 rotate, they cut magnetic lines of force to generate electricity. The first-stage generator impeller 2 is fixedly connected to the first-stage generator input shaft 6, which is connected to one input end of the gearbox 11, and then connected to the shaft of the inner rotor 9 of the dual-rotor generator 8 through one output end of the gearbox 11; the second-stage generator impeller 3 is fixedly connected to the second-stage generator input shaft 5, which is connected to the other input end of the gearbox 11, and then connected to the shaft of the outer rotor 10 of the dual-rotor generator 8 through the other output end of the gearbox 11; the inner rotor 9 and the outer rotor 10 of the dual-rotor generator 8 rotate and cut magnetic lines of force to generate electricity, and the generated electricity is sent out through the output cable 15.

[0036] To reduce the size of this invention, the primary power input shaft 6 and the secondary power input shaft 5 are designed as sleeve shafts. In this embodiment, the primary power input shaft 6 is placed inside the secondary power input shaft 5, that is, the secondary power input shaft 5 is sleeved outside the primary power input shaft 6, and the two are fitted with a clearance, which can realize rotational motion in opposite directions.

[0037] To prevent water from entering the nacelle 16, the connection between the nacelle 16 and the shaft of the secondary generator impeller 3 is sealed with a water-sealed baffle reinforcement structure 7.

[0038] In this embodiment, the number of blades of the secondary power generation impeller 3 is selected as 5, the number of blades of the primary power generation impeller 2 is selected as 6, and the radii of the secondary power generation impeller 3 and the primary power generation impeller 2 are the same, and the distance between the secondary power generation impeller 3 and the primary power generation impeller 2 is equal to the impeller radius.

[0039] The gap between the duct 1 and the secondary power generation impeller 3 and the primary power generation impeller 2 is 0.05 times the impeller diameter.

[0040] The steering structure includes a bracket 12, a bearing 13, and a support rod 14. One end of the support rod 14 extends into the bracket 12 and is connected to the bracket 12 via the bearing 13. The other end of the support rod 14 can be connected via a horizontal truss 17 (e.g., Figure 5 ) or mounting locking mechanism (such as Figure 4 )Matching connection.

[0041] To reduce ocean current resistance when the support 12 rotates, the support 12 is preferably streamlined.

[0042] When using this utility model, such as Figure 4 As shown, the lower part of the support rod 14 can be connected to the seabed via an assembly locking mechanism, thus achieving stable operation of the ocean current power generation device in place. During the design and construction phase of this utility model, the assembly locking mechanism can be manufactured and installed independently; as... Figure 5 As shown, multiple ocean current power generation devices of this utility model can also be arranged side by side and inverted, and connected to the upper horizontal truss 17 through their support rods 14 to form an array of ocean current power generation devices. This array can be arranged in a centralized manner, and the ocean current power generation devices can be designed, built, and flexibly configured independently to form a practical and efficient power generation system with high efficiency and flexibility, suitable for various sea conditions.

[0043] like Figure 1 , Figure 4 As shown, when the support 12 is arranged downwards, its support rod 14 is connected to the seabed through an assembly locking mechanism. When the direction of the incoming flow changes, the support 12 can rotate around the support rod 14, enabling the current power generation device of this invention to rotate itself and align the inlet end of the duct 1 with the direction of the incoming flow. The current drives the first-stage power generation impeller 2 to rotate forward, and the torque is input to the inner rotor 9 of the dual-rotor generator 8 through the first-stage power generation input shaft 6 and gearbox 11, causing the inner rotor 9 to rotate and generate electricity. At the same time, after the current passes through the first-stage power generation impeller 2, it gains a positive induced velocity, resulting in a larger angle of attack of the blades at the second-stage power generation impeller 3, improving the current efficiency. The second-stage power generation impeller 3 rotates in the opposite direction at a faster speed, and the torque is input to the outer rotor 10 of the dual-rotor generator 8 through the second-stage power generation input shaft 5 and gearbox 11. The outer rotor 10 rotates in the opposite direction, generating electricity. The electricity generated by the rotation of the inner rotor 9 and the outer rotor 10 is output through the output cable 15. After increasing the speed, the electricity is output to the dual-rotor generator 8 for power generation and is output through the cable 15.

[0044] like Figure 1 , Figure 5As shown, the support 12 of the current power generation device of this utility model can also be arranged upwards, and the support rod 14 is fixed on the horizontal truss 17 above. The horizontal truss 17 can be arranged in a single row or multiple rows, and the length can be selected according to the location. The current power generation device can rotate itself by rotating the support 12 around the support rod 14, and align the duct 1 with the direction of the incoming flow. The current drives the first-stage power generation impeller 2 and the second-stage power generation impeller 3 of the current power generation device to work. The torque is output to the inner rotor 9 and outer rotor 10 of the dual rotor generator 8 through the first-stage and second-stage power generation impellers 2 and 3-gearbox 11 to generate electricity. Figure 5 As shown, the ocean current power generation device of this utility model can be installed individually or in groups. When installed in groups, a parallel arrangement can be adopted. Specifically, the dual-rotor generator 8 can be placed within the horizontal truss 17 and connected to the gearbox 11 of each ocean current power generation device via a bevel gear pair and drive shaft. In this way, placing the drive shaft and gear pair connecting the dual-rotor generator 8 within the bracket 12 and support rod 14 avoids corrosion that might result from direct exposure to seawater. Furthermore, after selecting the spacing between the ocean current power generation devices, a suitable rotation angle limit should be set for the bracket 12 to ensure stable inflow. The output cable 15 can be integrated into the horizontal truss 17 to uniformly transmit the power generated by each ocean current power generation device.

[0045] This utility model of ocean current power generation device features a counter-rotating first-stage and second-stage power generation impeller, as well as a self-rotating convection function that follows the direction of the ocean current and modular installation. It can improve the efficiency of ocean current power generation over a wide flow velocity range and handle the problem of capturing reverse currents. At the same time, it avoids the structural reliability and cost issues of pitch control devices. The modular installation is flexible and efficient, and it is easy to disassemble and maintain the device, thus reducing construction and operation and maintenance costs.

[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model should fall within the protection scope of the technical solution of this utility model.

Claims

1. A counter-rotating duct current power generation device, comprising a power generation structure, characterized in that, The power generation structure is a counter-rotating power generation structure, which includes a first-stage power generation impeller, a second-stage power generation impeller, and a dual-rotor generator. The first-stage power generation impeller and the second-stage power generation impeller are installed sequentially and rotate in opposite directions under the action of ocean currents. The first-stage power generation impeller is connected to the inner rotor shaft of the dual-rotor generator via a first-stage power generation input shaft, and the second-stage power generation impeller is connected to the outer rotor shaft of the dual-rotor generator via a second-stage power generation input shaft.

2. The counter-rotating duct current power generation device according to claim 1, characterized in that, The dual-rotor generator is installed in the nacelle, which is fixedly mounted on a bracket. A support rod is mounted on the bracket via bearings. During use, the bracket rotates around the support rod under the action of ocean currents.

3. The counter-rotating duct current power generation device according to claim 2, characterized in that, The bracket is streamlined.

4. The counter-rotating duct current power generation device according to claim 1, characterized in that, The primary power generation input shaft and the secondary power generation input shaft are nested together to form a sleeve shaft, and the primary power generation impeller and the secondary power generation impeller are installed at a certain distance apart.

5. The counter-rotating duct current power generation device according to claim 4, characterized in that, The primary power generation impeller and the secondary power generation impeller are installed inside a duct, and the duct is an acceleration type duct.

6. The counter-rotating duct current power generation device according to claim 4, characterized in that, The first-stage power generation impeller and the second-stage power generation impeller have the same diameter, and the distance between the second-stage power generation impeller and the first-stage power generation impeller is equal to the radius of the power generation impeller. The number of blades in the first-stage power generation impeller is even, and the number of blades in the second-stage power generation impeller is odd.

7. The counter-rotating duct current power generation device according to claim 2, characterized in that, The connection between the nacelle and the shaft of the secondary generator impeller is sealed with a water-sealed baffle reinforcement structure.

8. The counter-rotating duct current power generation device according to claim 5, characterized in that, The catheter is a hollow acceleration type catheter, with the inlet end having the largest inner diameter and the other end having the smallest inner diameter.

9. The counter-rotating duct current power generation device according to claim 5, characterized in that, The gap between the duct and the first-stage and second-stage power generation impellers is 0.05 times the impeller diameter.

10. The counter-rotating duct current power generation device according to claim 1, characterized in that, The outer end of the primary generator input shaft is fastened to the propeller hub, and the center point of the propeller hub, the primary generator input shaft, and the secondary generator input shaft are located on the same straight line.

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