Double-rotor vertical shaft hydraulic turbine set

Abstract

The invention relates to the technical field of water turbines, and discloses a double-rotor vertical shaft water turbine set which comprises a first rotor, a second rotor, a transmission device and an output assembly. The first rotor comprises a first blade, a first rotating shaft and a first connecting rod, and the first connecting rod is fixedly connected between the first blade and the first rotating shaft; the second rotor comprises second blades, a second rotating shaft and second connecting rods, and the second connecting rods are fixedly connected between the second blades and the second rotating shaft; the first rotating shaft is parallel to the second rotating shaft, the first rotating shaft and the second rotating shaft are distributed at intervals in the radial direction of the first rotating shaft, and a phase difference exists between the first blade and the second blade; and the transmission device is in transmission connection between the first rotating shaft and the second rotating shaft. Through staggered layout and synchronous rotation of the first rotor and the second rotor, more water turbines can be arranged in the same tidal current energy water channel, the energy conversion efficiency is remarkably improved, meanwhile, the length of a machine body is reduced, the stability is improved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water turbines, in particular to a double-rotor vertical-axis water turbine unit. BACKGROUND

[0002] Current research on vertical-axis water turbines mainly focuses on single-rotor devices. With the increasing demand for large-scale development and application of tidal energy, the installed capacity of single-rotor vertical-axis tidal energy devices is continuously increasing, and the carrier forms are becoming increasingly diversified. At the same time, some single-rotor vertical-axis water turbine devices have problems such as low energy capture efficiency and high sensitivity to terrain changes.

[0003] To address these challenges, researchers have proposed various double-rotor vertical-axis water turbine configurations to improve the energy capture efficiency and self-starting performance of water turbines. Studies have shown that a reasonably designed double-rotor vertical-axis water turbine configuration can significantly enhance the capture efficiency and optimize the self-starting performance of the water turbine.

[0004] In the prior art, an invention patent with application number 2019110073088 discloses a vertical-axis double-rotor hydroelectric generator. The main structure of the generator includes a generator main body, an upper water turbine, and a lower water turbine. The upper and lower water turbines rotate in opposite directions. The main structure of the generator main body includes an outer shell end cover, an outer shell, a fixed seat, an upper outer shell bearing, a winding rotor upper end cover, a winding rotor outer shell, a winding rotor lower end cover, a rotor bearing, a winding, a permanent magnet rotor, a permanent magnet rotor shaft, a double-layer bearing, a connecting piece, a lower outer shell bearing, a current collector ring assembly, and a magnetic suspension weight reduction assembly. When working, the water flow impacts the upper water turbine to rotate in the positive direction, and the lower water turbine rotates in the opposite direction, causing the winding and the permanent magnet rotor to rotate in opposite directions to increase the relative rotational speed, and the generated electric energy is transmitted to the generator through the current collector ring and the carbon brush.

[0005] The above-mentioned prior art adopts a double-rotor structure, with two rotors arranged vertically. By utilizing the counter-rotation of the two rotors, the power generation efficiency is improved. However, the longitudinal arrangement of the body structure is relatively high, which poses challenges for installation and transportation. In addition, when subjected to extreme loads, the torque on the longer body structure is larger, which affects the stability and service life of the unit. SUMMARY

[0006] The purpose of the present application is to provide a double-rotor vertical-axis water turbine unit to solve the problem of high body structure of the water turbine in the prior art, which affects the stability and service life.

[0007] To achieve the above-mentioned purpose, the present application provides a double-rotor vertical-axis water turbine unit, which comprises a first rotor, a second rotor, a transmission device, and an output assembly.

[0008] The first rotor comprises a first blade, a first rotating shaft and a first connecting rod, the first blade has a plurality of first blades, each of the first blades is uniformly distributed along the circumference of the first rotating shaft, and the first connecting rod is fixedly connected between each of the first blades and the first rotating shaft;

[0009] The second rotor comprises a second blade, a second rotating shaft and a second connecting rod, the second blade has a plurality of second blades, each of the second blades is uniformly distributed along the circumference of the second rotating shaft, and the second connecting rod is fixedly connected between each of the second blades and the second rotating shaft;

[0010] The first rotating shaft and the second rotating shaft are parallel to each other, and the first rotating shaft and the second rotating shaft are distributed along the radial direction of the first rotating shaft, and the first blade and the second blade have a phase difference;

[0011] The transmission device is drivingly connected between the first rotating shaft and the second rotating shaft, and is used to drive the first rotating shaft and the second rotating shaft to rotate synchronously, and the first rotating shaft and the second rotating shaft are drivingly connected with the output assembly.

[0012] Preferably, the diameters of the first rotor and the second rotor are defined as D, and the distance between the first rotating shaft and the second rotating shaft is defined as L, and L is in the range of 0.7D-1.0D.

[0013] Preferably, L is 0.9D.

[0014] Preferably, the first rotor and the second rotor have a first state of rotating inward relative to the direction of the incoming flow and a second state of rotating outward relative to the direction of the incoming flow, and the tip speed ratio of the first rotor and the second rotor is defined as TSR,

[0015] When TSR<2.1, the first rotor and the second rotor are in the first state; when TSR>2.1, the first rotor and the second rotor are in the second state.

[0016] Preferably, the number of the first blade and the second blade is defined as n, and the phase difference is defined as φ, and φ is in the range of 0°-360° / n.

[0017] Preferably, the transmission device includes a housing, a first bevel gear, a second bevel gear and a transmission shaft. There are two housings, and the two housings are respectively mounted on the top of the first rotating shaft and the second rotating shaft, and the first rotating shaft and the second rotating shaft are rotatably matched with the housing. The transmission shaft is perpendicular to the first rotating shaft and the second rotating shaft, and the transmission shaft is rotatably assembled between the two housings. The first bevel gears are provided at both axial ends of the transmission shaft, and the top ends of the first rotating shaft and the second rotating shaft are rotatably assembled with the second bevel gear, and the first bevel gear and the second bevel gear are meshed with each other.

[0018] Preferably, the output assembly includes a first output shaft, a second output shaft and a third bevel gear, the third bevel gear is provided at one end of the first output shaft and one end of the second output shaft, the first output shaft is coaxially arranged with the first rotating shaft, the second output shaft is coaxially arranged with the second rotating shaft, and the third bevel gear is meshed with the first bevel gear.

[0019] Preferably, the first connecting rods are arranged in two layers at intervals along the vertical direction, and the first connecting rods in the same layer are coplanar; the second connecting rods are arranged in two layers at intervals along the vertical direction, and the second connecting rods in the same layer are coplanar.

[0020] Preferably, the first rotor and the second rotor also include vortex-breaking plates, and the vortex-breaking plates are connected to both ends of each first blade in the height direction and both ends of each second blade in the height direction. The vortex-breaking plates at both ends of the first blade are connected to the first rotating shaft, and the vortex-breaking plates at both ends of the second blade are connected to the second rotating shaft.

[0021] Compared with the prior art, a dual-rotor vertical-axis turbine unit according to an embodiment of the present invention has the following beneficial effects: the first rotating axes and the second rotating axes of the first rotor and the second rotor are parallel to each other and are distributed at intervals along the radial direction of the first rotating axis, so that the first rotor and the second rotor are distributed laterally at intervals in a parallel manner, and the first blade and the second blade have a phase difference, so that the first rotor and the second rotor form an interlaced layout, which reduces the fuselage length of the turbine unit, improves the stability and service life of the turbine unit, saves the layout space of the turbine unit, and arranges more turbines in the same tidal energy waterway, significantly improving the energy conversion efficiency; on the other hand, the transmission device causes the first rotor and the second rotor to rotate synchronously, and the motion trajectories of the first blade and the second blade partially overlap when rotating, and the overall flow area is reduced. The canyon effect between the first rotor and the second rotor can be effectively utilized to increase the inflow velocity and lift of the first blade and the second blade on the flow side, thereby improving the energy capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the dual-rotor vertical-axis water turbine unit of the present invention;

[0023] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the transmission device of the twin-rotor vertical axis turbine unit;

[0024] Figure 3 Schematic diagram of energy capture efficiency of the dual-rotor vertical-axis hydraulic turbine unit of the present invention at different blade tip speed ratios;

[0025] Figure 4 is a schematic diagram of the first rotor and the second rotor of the dual-rotor vertical-axis hydraulic turbine unit of the present invention when they are in a second state;

[0026] Figure 5 2 is a schematic diagram of a first rotor and a second rotor of a dual-rotor vertical-axis hydraulic turbine assembly according to the present invention in a first state;

[0027] Figure 6 Schematic diagram of energy capture efficiency of the dual-rotor vertical-axis hydraulic turbine unit of the present invention when the first rotating shaft and the second rotating shaft are at different distances;

[0028] Figure 7 Schematic diagram of the phase difference between the first rotor and the second rotor of the dual-rotor vertical axis hydraulic turbine unit of the present invention;

[0029] Figure 8 It is a schematic diagram of energy capture efficiency when the first rotor and the second rotor of the dual-rotor vertical axis turbine unit of the present invention have different phase differences.

[0030] In the figure, 1. first rotor, 11. first blade, 12. first rotating shaft, 13. first connecting rod, 2. second rotor, 21. second blade, 22. second rotating shaft, 23. second connecting rod, 3. transmission device, 31. housing, 32. first bevel gear, 33. second bevel gear, 34. transmission shaft, 4. output assembly, 41. first output shaft, 42. second output shaft, 43. third bevel gear, 5. vortex elimination plate. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0032] A preferred embodiment of a dual-rotor vertical axis water turbine unit of the present invention is as follows: Figures 1 to 8As shown, the twin-rotor vertical-axis hydro-turbine unit includes a first rotor 1, a second rotor 2, a transmission device 3, and an output assembly 4. The first rotor 1 and the second rotor 2 are independent of each other. The transmission device 3 is connected to the first rotor 1 and the second rotor 2. The first rotor 1 and the second rotor 2 are respectively connected to the output assembly 4. The first rotor 1 and the second rotor 2 are arranged in a waterway. The transmission device 3 is used to drive the first rotor 1 and the second rotor 2 to rotate synchronously. The output assembly 4 is used to transmit the rotational power of the first rotor 1 and the second rotor 2 to the power transmission mechanism.

[0033] The first rotor 1 includes a first blade 11, a first rotating shaft 12, and a first connecting rod 13. The first blade 11 extends vertically, the axial direction of the first rotating shaft 12 coincides with the extension direction of the first blade 11, and the blade surface of the first blade 11 faces the direction of the water flow. There are multiple first blades 11, each of which is evenly spaced along the circumference of the first rotating shaft 12. A first connecting rod 13 is fixedly connected between each first blade 11 and the first rotating shaft 12. In this embodiment, there are three first blades 11, and the angle between the line connecting two adjacent first blades 11 and the first rotating shaft 12 is 120 degrees, ensuring that the three first blades 11 are evenly distributed around the first rotating shaft 12. The first connecting rod 13 is connected between the first blade 11 and the first rotating shaft 12, so that when the first blade 11 is impacted by the water flow, the first connecting rod 13 can drive the first rotating shaft 12 to rotate.

[0034] The second rotor 2 includes a second blade 21, a second rotating shaft 22, and a second connecting rod 23. The second blade 21 extends vertically, with the axial direction of the second rotating shaft 22 aligned with the extension direction of the second blade 21. The blade surface of the second blade 21 faces the direction of the water flow. There are multiple second blades 21, each of which is evenly spaced along the circumference of the second rotating shaft 22. A second connecting rod 23 is fixedly connected between each second blade 21 and the second rotating shaft 22. In this embodiment, there are three second blades 21, and the angle between the line connecting two adjacent second blades 21 and the second rotating shaft 22 is 120 degrees, ensuring that the three second blades 21 are evenly distributed around the second rotating shaft 22. The second connecting rod 23 is connected between the second blade 21 and the second rotating shaft 22, so that when the second blade 21 is impacted by the water flow, the second connecting rod 23 can drive the second rotating shaft 22 to rotate.

[0035] The first rotating shaft 12 and the second rotating shaft 22 are parallel to each other and spaced apart from each other along the radial direction of the first rotating shaft 12. In this embodiment, the radial direction of the first rotating shaft 12 is the horizontal direction. The first rotating shaft 12 and the second rotating shaft 22 are spaced apart along the horizontal direction, so that the first rotor 1 and the second rotor 2 are spaced apart and independent of each other. This reduces the length of the first rotor 1 and the second rotor 2, allowing them to be placed simultaneously in the waterway, thereby improving the energy conversion efficiency of the turbine.

[0036] The spacing between the first and second rotating shafts 12, 22 is smaller than the diameters of the first and second rotors 1, 2. This means that the vertical projections of the first and second rotors 1, 2 overlap. A phase difference exists between the first and second blades 11, 21 to prevent interference between the rotation of the first and second rotors 1, 2. This also allows for the staggered arrangement of the first and second rotors 1, 2, effectively utilizing the canyon effect between the turbine units, increasing the inflow velocity of the first and second blades 11, 21 on the upstream side and enhancing the lift of the first and second blades 11, 21.

[0037] The transmission device 3 is connected between the first rotating shaft 12 and the second rotating shaft 22, and is used to drive the first rotating shaft 12 and the second rotating shaft 22 to rotate synchronously. When the first rotating shaft 12 and the second rotating shaft 22 rotate, they respectively drive the first blade 11 and the second blade 21 to rotate synchronously via the first connecting rod 13 and the second connecting rod 23. At this time, the first blade 11 and the second blade 21 can always maintain the same phase difference, and the first blade 11 and the second blade 21 can rotate alternately and independently like gears without interfering with each other.

[0038] Both the first rotating shaft 12 and the second rotating shaft 22 are in driving connection with the output assembly 4. This output assembly 4 is connected to a power transmission mechanism, transmitting rotational power to the transmission mechanism, thereby driving electrical components to generate or regulate magnetic fields (for example, rotation drives a coil to cut magnetic flux lines, generating current), thereby generating or transmitting electrical energy. The first rotor 1 and the second rotor 2 simultaneously provide power to the output assembly 4, achieving synchronous dual-side power input. This provides the system with greater power and precise control capabilities, ensuring stable operation of the turbine under various conditions.

[0039] The aspect ratio is the ratio of a blade's span (i.e., blade length) to its chord (i.e., blade width). In the dual-rotor vertical-axis turbine system of this application, the spans of the first blades 11 and the second blades 21 are both 3-5. Aspect ratios within this range ensure an optimal balance between lift and drag on the first and second blades 11, 21 in the water flow, thereby improving energy capture efficiency.

[0040] The chord-to-diameter ratio is the ratio of the blade's chord length to the rotor diameter. In the dual-rotor vertical-axis turbine assembly of the present application, the chord-to-diameter ratios of the first and second blades 11, 21 are both within a range of 0.1-0.2. This chord-to-diameter ratio ensures uniform force on the first and second blades 11, 21 in the water flow, thereby improving the turbine's stability and service life.

[0041] The airfoil profile fitting equation is used to describe the shape of the blade. The symmetrical NACA airfoil series is usually used. The twin-rotor vertical axis turbine unit of this application uses airfoils such as NACA0014-0020. The profile fitting equation is as follows:

[0042]

[0043] Wherein, y is the distance from the centerline to the airfoil surface, t is the percentage of the maximum thickness, and for the NACA0014-0020 airfoil selected for the twin-rotor vertical axis turbine unit of this application, t is 14-20, x is the position along the chord length, and c is the chord length.

[0044] The first rotating shaft 12 and the second rotating shaft 22 of the first rotor 1 and the second rotor 2 of the dual-rotor vertical-axis turbine group are parallel to each other and are spaced apart radially along the first rotating shaft 12, so that the first rotor 1 and the second rotor 2 are spaced apart laterally in parallel with each other. The first blade 11 and the second blade 21 have a phase difference, so that the first rotor 1 and the second rotor 2 form a staggered layout, which reduces the fuselage length of the turbine group, improves the stability and service life of the turbine group, saves the layout space of the turbine group, and arranges more turbines in the same tidal energy waterway, significantly improving the energy conversion efficiency; on the other hand, the transmission device 3 causes the first rotor 1 and the second rotor 2 to rotate synchronously, and the motion trajectories of the first blade 11 and the second blade 21 partially overlap during rotation, reducing the overall flow area, and effectively utilizing the canyon effect between the first rotor 1 and the second rotor 2 to increase the inflow velocity and lift of the first blade 11 and the second blade 21 on the flow side, thereby improving the energy capture efficiency.

[0045] Preferably, the diameters of the first rotor 1 and the second rotor 2 are both defined as D, and the distance between the first rotating axis 12 and the second rotating axis 22 is defined as L, and the range of L is 0.7D-1.0D.

[0046] like Figure 6 As shown, the first rotor 1 and the second rotor 2 have the same diameter, ensuring that they output the same power within the same tidal energy channel. L ranges from 0.7D to 1.0D, allowing the first rotor 1 and the second rotor 2 to intersect with each other, with overlapping vertical projections. This saves space for turbine layout, reduces the overall flow area, and effectively creates a canyon effect between the two rotors, increasing the lift of the blades on the flow side and improving energy capture and conversion efficiency. The energy capture performance of the entire turbine unit at the optimal tip speed ratio is superior to that of an isolated single-rotor turbine.

[0047] Preferably, L is 0.9D.

[0048] like Figure 6As shown, experiments have shown that when the distance L between the first rotating shaft 12 and the second rotating shaft 22 is 0.9D, at the optimal tip speed ratio, the energy capture performance of the entire device is improved the most, by 10.07%, and at any tip speed ratio, the energy capture performance of the entire device is better than that of an isolated single-rotor turbine.

[0049] Preferably, the first rotor 1 and the second rotor 2 have a first state of inward rotation relative to the incoming flow direction and a second state of outward rotation relative to the incoming flow direction, defining the first rotor 1 and the second rotor 2 as follows:

[0050] The tip speed ratio of sub-2 is TSR.

[0051] When TSR is less than 2.1, the first rotor 1 and the second rotor 2 are in the first state; when TSR is greater than 2.1, the first rotor 1 and the second rotor 2 are in the second state.

[0052] like Figure 3 、 Figure 4 and Figure 5 As shown, the tip speed ratio (TSR) is a key parameter characterizing the rotational speed of a vertical-axis turbine and represents the dimensionless rotational speed. When the tip speed ratio (TSR) is less than 2.1, the energy capture performance is higher when the first rotor 1 and the second rotor 2 rotate inward relative to the incoming flow direction. When the tip speed ratio (TSR) is greater than 2.1, the energy capture performance is higher when the first rotor 1 and the second rotor 2 rotate outward relative to the incoming flow direction. Compared to a single rotor, the energy capture efficiency is most significantly improved when the first rotor 1 and the second rotor 2 rotate in opposite directions relative to the incoming flow direction, with an increase of 8.28%.

[0053] Preferably, the number of the first blades 11 and the second blades 21 are both defined as n, and the phase difference is defined as The range is 0°-360° / n.

[0054] like Figure 7 and Figure 8 As shown, the phase difference refers to the difference in phase between the first rotor 1 and the second rotor 2 before they start rotating. Energy capture performance varies slightly under different phase differences. Under any phase difference, the overall device's energy capture efficiency is very close to that of an isolated single rotor. The phase difference range is 0°-360° / n, ensuring that the first rotor 1 and the second rotor 2 do not interfere with each other.

[0055] Preferably, the transmission device 3 includes a housing 31, a first bevel gear 32, a second bevel gear 33 and a transmission shaft 34. There are two housings 31, and the two housings 31 are respectively mounted on the top of the first rotating shaft 12 and the second rotating shaft 22, and the first rotating shaft 12 and the second rotating shaft 22 are rotatably matched with the housing 31. The transmission shaft 34 is perpendicular to the first rotating shaft 12 and the second rotating shaft 22. The transmission shaft 34 is rotatably assembled between the two housings 31. The first bevel gears 32 are provided at both axial ends of the transmission shaft 34. The top ends of the first rotating shaft 12 and the second rotating shaft 22 are rotatably assembled with the second bevel gear 33, and the first bevel gear 32 and the second bevel gear 33 are meshed with each other.

[0056] like Figure 2 As shown, the transmission device 3 is formed by a housing 31, a first bevel gear 32, a second bevel gear 33 and a transmission shaft 34. The top end of the first rotating shaft 12 and the top end of the second rotating shaft 22 are both connected to the transmission shaft 34 through the second bevel gear 33 and the first bevel gear 32. The first bevel gear 32 and the second bevel gear 33 are mechanically matched and can always maintain the same transmission ratio, ensuring the stability and durability of the transmission, thereby ensuring the synchronous rotation of the first rotor 1 and the second rotor 2, reducing the risk of blade interference, reducing the maintenance requirements of the turbine unit, and ensuring the service life of the transmission device 3.

[0057] In this embodiment, the first rotating shaft 12 , the second rotating shaft 22 , and the transmission shaft 34 are all connected to cylindrical bearings, and are rotatably matched with the housing 31 through the cylindrical bearings to reduce resistance during rotation.

[0058] Preferably, the output assembly 4 includes a first output shaft 41, a second output shaft 42 and a third bevel gear 43. A third bevel gear 43 is provided at one end of the first output shaft 41 and one end of the second output shaft 42. The first output shaft 41 is coaxially arranged with the first rotating shaft 12, the second output shaft 42 is coaxially arranged with the second rotating shaft 22, and the third bevel gear 43 is engaged with the first bevel gear 32.

[0059] The output assembly 4 is formed by a first output shaft 41, a second output shaft 42, and a third bevel gear 43. The third bevel gear 43 meshes with the first bevel gear 32, thereby achieving transmission with the second bevel gear 33, thereby connecting the first output shaft 41 to the first rotating shaft 12 and the second output shaft 42 to the second rotating shaft 22. The two third bevel gears 43 have the same transmission ratio as the two first bevel gears 32, ensuring that the output power of the first output shaft 41 and the second output shaft 42 is consistent, achieving synchronous power input on both sides.

[0060] Preferably, the first connecting rods 13 are vertically spaced in two layers, and the first connecting rods 13 in the same layer are coplanar; the second connecting rods 23 are vertically spaced in two layers, and the second connecting rods 23 in the same layer are coplanar.

[0061] The first connecting rod 13 and the second connecting rod 23 are each arranged in two layers at intervals along the vertical direction. Each first blade 11 and the first rotating shaft 12, and each second blade 21 and the second rotating shaft 22 are fixed at two points respectively, thereby increasing the overall strength of the first rotor 1 and the second rotor 2 and ensuring stability during rotation.

[0062] The first connecting rods 13 and the second connecting rods 23 on the same layer are coplanar. When the first rotor 1 and the second rotor 2 rotate, the forces exerted by the first connecting rods 13 on the first rotating shaft 12 are on the same plane, and the forces exerted by the second connecting rods 23 on the second rotating shaft 22 are also on the same plane. The forces at the connection position of the first rotating shaft 12 and the second rotating shaft 22 are balanced and offset each other, thereby ensuring the service life of the device.

[0063] Preferably, the first rotor 1 and the second rotor 2 also include vortex-breaking plates 5, and vortex-breaking plates 5 are connected to both ends of each first blade 11 in the height direction and both ends of each second blade 21 in the height direction. The vortex-breaking plates 5 at both ends of the first blade 11 are connected to the first rotating shaft 12, and the vortex-breaking plates 5 at both ends of the second blade 21 are connected to the second rotating shaft 22.

[0064] Vortex-eliminating plates 5 are provided at both ends of the first blade 11 and both ends of the second blade 21, which can effectively reduce the vortex leakage at the blade tip, thereby improving the lift on the blade surface, and increasing the overall structural strength of the first blade 11 and the second blade 21, thereby improving the torque output and energy acquisition efficiency of the turbine and reducing the risk of blade deformation.

[0065] In summary, an embodiment of the present invention provides a dual-rotor vertical-axis hydro turbine unit, in which the first rotating axes and the second rotating axes of the first rotor and the second rotor are parallel to each other and are radially spaced apart along the first rotating axis, so that the first rotor and the second rotor are laterally spaced apart in a parallel manner, and the first blade and the second blade have a phase difference, so that the first rotor and the second rotor form an interlaced layout, which reduces the fuselage length of the hydro turbine unit, improves the stability and service life of the hydro turbine unit, saves the layout space of the hydro turbine unit, and arranges more hydro turbines in the same tidal energy waterway, significantly improving the energy conversion efficiency; on the other hand, the transmission device causes the first rotor and the second rotor to rotate synchronously, and the motion trajectories of the first blade and the second blade partially overlap when rotating, and the overall flow area is reduced, which can effectively utilize the canyon effect between the first rotor and the second rotor, increase the inflow velocity and lift of the first blade and the second blade on the flow side, and improve the energy capture efficiency.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A twin-rotor vertical axis hydraulic turbine unit, characterized in that: It comprises a first rotor (1), a second rotor (2), a transmission device (3) and an output assembly (4); The first rotor (1) comprises a first blade (11), a first rotating shaft (12) and a first connecting rod (13); there are a plurality of first blades (11), each of the first blades (11) is evenly spaced along the circumference of the first rotating shaft (12); each of the first blades (11) and the first rotating shaft (12) is fixedly connected to the first connecting rod (13); The second rotor (2) comprises a second blade (21), a second rotating shaft (22) and a second connecting rod (23); there are a plurality of second blades (21), each second blade (21) is evenly spaced along the circumference of the second rotating shaft (22); each second blade (21) is fixedly connected to the second rotating shaft (22) by the second connecting rod (23); The first rotating shaft (12) and the second rotating shaft (22) are parallel to each other, and the first rotating shaft (12) and the second rotating shaft (22) are spaced apart along the radial direction of the first rotating shaft (12), and the first blade (11) and the second blade (21) have a phase difference; The transmission device (3) is transmission-connected between the first rotating shaft (12) and the second rotating shaft (22), and the transmission device (3) is used to drive the first rotating shaft (12) and the second rotating shaft (22) to rotate synchronously, and the first rotating shaft (12) and the second rotating shaft (22) are both transmission-connected to the output component (4).

2. The dual-rotor vertical axis water turbine unit according to claim 1, characterized in that: The diameters of the first rotor (1) and the second rotor (2) are both defined as D, and the distance between the first rotating axis (12) and the second rotating axis (22) is defined as L, and the range of L is 0.7D-1.0D.

3. The dual-rotor vertical axis water turbine unit according to claim 2, characterized in that: L is 0.9D.

4. The twin-rotor vertical axis water turbine unit according to any one of claims 1 to 3, characterized in that: The first rotor (1) and the second rotor (2) have a first state of inward counter-rotation relative to the incoming flow direction and a second state of outward counter-rotation relative to the incoming flow direction, and the tip speed ratios of the first rotor (1) and the second rotor (2) are both defined as TSR. When TSR is less than 2.1, the first rotor (1) and the second rotor (2) are in a first state; when TSR is greater than 2.1, the first rotor (1) and the second rotor (2) are in a second state.

5. The twin-rotor vertical axis water turbine unit according to any one of claims 1 to 3, characterized in that: The number of the first blades (11) and the second blades (21) are both defined as n, and the phase difference is defined as The range is 0°-360° / n.

6. The twin-rotor vertical axis water turbine unit according to any one of claims 1 to 3, characterized in that: The transmission device (3) comprises a housing (31), a first bevel gear (32), a second bevel gear (33) and a transmission shaft (34). There are two housings (31), and the two housings (31) are respectively mounted on the top of the first rotating shaft (12) and the second rotating shaft (22), and the first rotating shaft (12) and the second rotating shaft (22) are rotatably matched with the housing (31). The transmission shaft (34) is perpendicular to the first rotating shaft (12) and the second rotating shaft (22). The transmission shaft (34) is rotatably assembled between the two housings (31). The first bevel gear (32) is provided at both axial ends of the transmission shaft (34). The top ends of the first rotating shaft (12) and the second rotating shaft (22) are rotatably assembled with the second bevel gear (33), and the first bevel gear (32) and the second bevel gear (33) are meshed with each other.

7. The dual-rotor vertical axis water turbine unit according to claim 6, characterized in that: The output assembly (4) comprises a first output shaft (41), a second output shaft (42) and a third bevel gear (43); one end of the first output shaft (41) and one end of the second output shaft (42) are both provided with the third bevel gear (43); the first output shaft (41) is coaxially arranged with the first rotating shaft (12); the second output shaft (42) is coaxially arranged with the second rotating shaft (22); and the third bevel gear (43) is meshed with the first bevel gear (32).

8. The twin-rotor vertical axis water turbine unit according to any one of claims 1 to 3, characterized in that: The first connecting rods (13) are arranged in two layers at intervals along the vertical direction, and the first connecting rods (13) in the same layer are coplanar; the second connecting rods (23) are arranged in two layers at intervals along the vertical direction, and the second connecting rods (23) in the same layer are coplanar.

9. The dual-rotor vertical axis water turbine unit according to any one of claims 1 to 3, characterized in that: The first rotor (1) and the second rotor (2) both further comprise vortex-eliminating plates (5), and both ends of each first blade (11) in the height direction and both ends of each second blade (21) in the height direction are connected to the vortex-eliminating plates (5), the vortex-eliminating plates (5) at both ends of the first blade (11) are connected to the first rotating shaft (12), and the vortex-eliminating plates (5) at both ends of the second blade (21) are connected to the second rotating shaft (22).

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