Hydropower station tail water secondary power generation device

Abstract

The utility model discloses a hydropower station tail water secondary power generation device, which relates to the technical field of hydroelectric generation, and comprises a plurality of groups of diversion seats, the diversion seats are arranged in a tail water channel, one side of each diversion seat facing incoming water is provided with three diversion cone ports, the rear sides of the three diversion cone ports are respectively provided with a vertical shaft water turbine, and the vertical shaft water turbine is provided with a vertical shaft. The upper end of each vertical-axis water turbine is provided with a speed-increasing generator, an input shaft of each speed-increasing generator is fixedly connected with a rotating shaft of the corresponding vertical-axis water turbine, and turnover guide plates are rotationally installed at the positions, corresponding to the intervals of the three diversion cone openings, of the side, facing the incoming water, of the flow guide base. The flow guide angle is adjusted according to the tail water flow, so that water flow can impact the vertical-axis water turbine more efficiently, the water energy utilization rate is increased, and the stability and the power generation efficiency of the device are guaranteed. Meanwhile, through the arrangement of the speed-increasing generator, the rotating speed of the vertical-axis water turbine can be increased, and then the power generation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydropower technology, specifically to a secondary power generation device for tailrace of a hydropower station. Background Technology

[0002] my country is one of the countries with relatively abundant water resources in the world, and also one of the countries with a large installed capacity of hydropower. Numerous hydropower stations are distributed throughout the country. In the existing hydropower stations, the tailwater discharged by the primary generator unit not only has a considerable water pressure, but also has a very stable flow and water pressure. The potential energy of the tailwater remaining after the primary hydropower generation can be used for secondary power generation, so that the precious water resources can be fully and completely utilized.

[0003] The secondary power generation scheme for tailrace energy recovery in hydropower stations often employs a horizontal-shaft turbine installed at the tailrace outlet, using fixed guide piers to direct the water flow to impact the turbine runner. While this structure achieves energy recovery, it has significant drawbacks: the horizontal-shaft turbine requires high flow velocities to maintain efficiency, but uneven tailrace velocity distribution leads to severe runner cavitation; the fixed guide structure cannot adapt to water level changes, resulting in poor guidance during the dry season; and the integral frame makes maintenance difficult, requiring the tailrace channel to be emptied for runner replacement, disrupting the normal operation of the power station. Therefore, we propose a secondary power generation device for hydropower station tailrace. Utility Model Content

[0004] The purpose of this invention is to address the common practice in hydropower stations of utilizing tailrace energy through secondary power generation by installing a horizontal-shaft turbine at the tailrace outlet, using fixed guide piers to direct water flow to impact the turbine runner. While this structure achieves energy recovery, it has significant drawbacks: the horizontal-shaft turbine requires high flow velocities to maintain efficiency, but uneven tailrace velocity distribution leads to severe runner cavitation; the fixed guide structure cannot adapt to water level changes, resulting in poor guidance during the dry season; and the integral frame makes maintenance difficult, requiring the tailrace channel to be emptied for runner replacement, affecting the normal operation of the power station. This invention provides a secondary power generation device for hydropower station tailrace.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A secondary power generation device for the tailrace of a hydropower station includes a flow guide seat. Multiple sets of flow guide seats are installed in the tailrace channel. Each flow guide seat has three diversion cones facing the incoming water. A vertical axis turbine is respectively installed on the rear side of each of the three diversion cones. A speed-increasing generator is installed at the upper end of each vertical axis turbine. The input shaft of the speed-increasing generator is fixedly connected to the rotating shaft of the vertical axis turbine. Rotating guide plates are rotatably installed on the flow guide seat at intervals corresponding to the three diversion cones facing the incoming water. Side baffles are fixedly connected to both ends of the flow guide seat facing the incoming water. A transmission box is installed at the upper end of the flow guide seat. The rotating shafts of the multiple rotating guide plates are all connected to the transmission box.

[0007] Furthermore, the inner cavity of the transmission box is hollow, and the upper end of the rotating shaft of the flipping guide plate passes through the transmission box. The upper ends of the rotating shafts of the two flipping guide plates corresponding to each guide seat are respectively keyed and fixed with a driven gear and a driving double-layer gear. The driven gear and the lower gear of the driving double-layer gear mesh and drive each other. The inner wall of the transmission box is slidably connected with a driving rack through a slide rail. The driving rack meshes and drives the upper gear of the driving double-layer gear.

[0008] Furthermore, a drive motor is fixedly installed on one side of the transmission box, and a lead screw nut is fixedly connected to the drive rack on the side corresponding to the drive motor. The drive motor shaft passes through the transmission box and is fixedly connected to a drive screw, and the drive screw and the lead screw nut are threadedly engaged for transmission.

[0009] Furthermore, a rubber contact pad is fixedly connected to the outer end of the side stop.

[0010] Furthermore, the inlet of the vertical axis turbine corresponds to the rear side of the diversion cone, and the outlet of the vertical axis turbine is guided to the tangential direction of the impeller inside the vertical axis turbine.

[0011] Furthermore, a protective filter screen is fixedly connected to the side of the flow guide seat facing the incoming water.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This utility model, through the design of a flow guide seat, allows for water diversion through three diversion cones when the tailwater flow is high. These diversion cones then drive three vertical-axis turbines to generate electricity via a speed-increasing generator. A rotating guide plate, by flipping, engages with or remains parallel to the side baffles on both sides, switching the direction of water flow at the two diversion cones. When the tailwater flow is low, the transmission box drives the two rotating guide plates to flip outwards, engaging with the front of the side baffles on both sides. This guides the tailwater flowing towards the two diversion cones to converge at the central diversion cone, ensuring that the vertical-axis turbine corresponding to the central diversion cone drives the generator. The rotating guide plate adjusts the guide angle according to the tailwater flow, allowing the water flow to more efficiently impact the vertical-axis turbine, improving water energy utilization and ensuring the stability and power generation efficiency of the device. Simultaneously, the speed-increasing generator increases the rotational speed of the vertical-axis turbine, further enhancing power generation efficiency.

[0014] 2. This invention, through the configuration of a driven gear, a double-layered driving gear, and a driving rack, enables adjustment of the tilting angle of the tilting guide plates, thereby guiding and distributing the water flow. The driving rack slides within the transmission box, driving the upper gear of the double-layered driving gear to rotate. Since the driven gear meshes with the lower gear of the double-layered driving gear, the rotation of the double-layered driving gear drives the driven gear to rotate, thus achieving synchronous tilting of the two tilting guide plates. By adjusting the tilting angle of the tilting guide plates, the guidance and distribution of the water flow can be altered, allowing the water flow to impact the vertical shaft turbine runner more evenly, improving power generation efficiency.

[0015] 3. This utility model, through its drive motor, lead screw nut, and drive screw, provides power for the sliding of the drive rack, thereby achieving automated adjustment of the tilting angle of the tilting guide plate. When the drive motor is working, its shaft drives the drive screw to rotate. Since the drive screw and lead screw nut are connected by a threaded connection, the rotation of the drive screw causes the lead screw nut and the drive rack fixedly connected to it to slide within the transmission box. The sliding of the drive rack drives the upper gear of the meshing double-layer drive gear to rotate, thus adjusting the tilting angle of the tilting guide plate. This automated adjustment method not only improves work efficiency but also facilitates remote control and intelligent management. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a bottom sectional view of the present invention;

[0018] Figure 3 This is a top sectional view of the interior of the transmission box corresponding to this utility model;

[0019] Figure 4 This is a diagram of the internal transmission structure of the transmission box of this utility model.

[0020] Reference numerals in the attached diagram: 1. Flow guide seat; 2. Flow divider cone; 3. Protective filter screen; 4. Flip-over flow guide plate; 5. Side stop; 6. Transmission box; 7. Driven gear; 8. Drive double-layer gear; 9. Drive rack; 10. Screw nut; 11. Drive motor; 12. Vertical shaft turbine; 13. Speed-increasing generator. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0022] Please see Figures 1-4 This utility model provides a secondary power generation device for the tailrace of a hydropower station, including a guide seat 1. Multiple sets of guide seats 1 are installed in the tailrace channel. Each guide seat 1 has three diversion cones 2 facing the incoming water. A vertical shaft turbine 12 is respectively installed on the rear side of the three diversion cones 2. A speed-increasing generator 13 is installed at the upper end of each vertical shaft turbine 12. The input shaft of the speed-increasing generator 13 is fixedly connected to the rotating shaft of the vertical shaft turbine 12. A flipping guide plate 4 is rotatably installed on the guide seat 1 facing the incoming water at intervals corresponding to the three diversion cones 2. Side baffles 5 are fixedly connected to both ends of the guide seat 1 facing the incoming water. A transmission box 6 is installed at the upper end of the guide seat 1. The rotating shafts of the multiple flipping guide plates 4 are all connected to the transmission box 6.

[0023] In this embodiment, preferably, the inner cavity of the transmission box 6 is hollow, and the upper end of the rotating shaft of the flipping guide plate 4 passes through the transmission box 6. The upper ends of the rotating shafts of the two flipping guide plates 4 corresponding to each guide seat 1 are respectively keyed and fixed with a driven gear 7 and a driving double-layer gear 8. The driven gear 7 and the lower gear of the driving double-layer gear 8 mesh and transmit power. A driving rack 9 is slidably connected to the inner wall of the transmission box 6 via a slide rail. The driving rack 9 meshes and transmits power with the upper gear of the driving double-layer gear 8. Through the driven gear 7, the driving double-layer gear 8, and the driving rack 9, the flipping angle of the flipping guide plate 4 can be adjusted, thereby guiding and distributing the water flow. The driving rack 9 slides within the transmission box 6, driving the upper gear of the driving double-layer gear 8 that meshes with it to rotate. Since the driven gear 7 meshes and transmits power with the lower gear of the driving double-layer gear 8, the rotation of the driving double-layer gear 8 will drive the driven gear 7 to rotate, thereby achieving synchronous flipping of the two flipping guide plates 4. By adjusting the tilting angle of the tilting guide plate 4, the direction and distribution of the water flow can be changed, so that the water flow can impact the runner of the vertical shaft turbine 12 more evenly, thereby improving the power generation efficiency.

[0024] In this embodiment, preferably, a drive motor 11 is fixedly installed on one side of the transmission box 6, and a lead screw nut 10 is fixedly connected to the drive rack 9 on the side corresponding to the drive motor 11. The shaft of the drive motor 11 passes through the transmission box 6 and is fixedly connected to a drive screw, which is threadedly engaged with the lead screw nut 10 for transmission. The drive motor 11, lead screw nut 10, and drive screw provide power for the sliding of the drive rack 9, thereby achieving automated adjustment of the tilting angle of the tilting guide plate 4. When the drive motor 11 is working, its shaft drives the drive screw to rotate. Since the drive screw is threadedly engaged with the lead screw nut 10, the rotation of the drive screw causes the lead screw nut 10 and the drive rack 9 fixedly connected to it to slide within the transmission box 6. The sliding of the drive rack 9 causes the upper gear of the meshing drive double-layer gear 8 to rotate, thereby achieving adjustment of the tilting angle of the tilting guide plate 4. This automated adjustment method not only improves work efficiency but also facilitates remote control and intelligent management.

[0025] In this embodiment, preferably, a rubber contact pad is fixedly connected to the outer end of the side stop 5. This reduces the wear and tear on the tilting guide plate 4 during installation and improves the contact sealing performance.

[0026] In this embodiment, preferably, the inlet of the vertical axis turbine 12 corresponds to the rear side of the diversion cone 2, and the outlet of the vertical axis turbine 12 is guided to the tangential direction of the impeller inside the vertical axis turbine 12; so that the water flow can smoothly enter the vertical axis turbine 12, increase the impact force of the water flow on the impeller, and thus improve the power generation efficiency.

[0027] In this embodiment, preferably, a protective filter screen 3 is fixedly connected to the flow guide seat 1 facing the incoming water side. The protective filter screen 3 effectively prevents debris from entering the device, ensuring its safe operation.

[0028] The working principle and usage process of this utility model are as follows: In use, the guide seat 1, when the tailwater flow is large, can divert the water flow through three diversion cones 2 on the side facing the incoming water. The water flow is then driven by three vertical shaft turbines 12 to generate electricity through the speed-increasing generators 13. The rotating guide plate 4 can rotate to engage with or remain parallel to the side baffles 5 on both sides, thus switching the direction of the water flow at the two diversion cones 2. When the tailwater flow is small, the transmission box 6 drives the two rotating guide plates 4 to rotate outward, engaging with the front side of the side baffles 5 on both sides. This guides the tailwater flowing towards the two diversion cones 2 to the central diversion cone 2, ensuring that the vertical shaft turbine 12 corresponding to the central diversion cone 2 drives the generator. By rotating the guide plate 4, the guide angle can be adjusted according to the tailwater flow, allowing the water flow to impact the vertical shaft turbine 12 more efficiently, improving the water energy utilization rate and ensuring the stability and power generation efficiency of the device. Meanwhile, the speed-increasing generator 13 can increase the rotational speed of the vertical shaft turbine 12, thereby improving the power generation efficiency.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydroelectric power plant tailrace secondary power generation device, characterized by: The system includes a flow guide seat (1), which is installed in multiple sets in the tailrace channel. Each flow guide seat (1) has three diversion cones (2) facing the incoming water. A vertical shaft turbine (12) is set on the rear side of each of the three diversion cones (2). A speed-increasing generator (13) is set on the upper end of each vertical shaft turbine (12). The input shaft of the speed-increasing generator (13) is fixedly connected to the rotating shaft of the vertical shaft turbine (12). A flipping flow guide plate (4) is rotatably installed on the flow guide seat (1) facing the incoming water at intervals corresponding to the three diversion cones (2). Side baffles (5) are fixedly connected to both ends of the flow guide seat (1) facing the incoming water. A transmission box (6) is set on the upper end of the flow guide seat (1). The rotating shafts of the multiple flipping flow guide plates (4) are all connected to the transmission box (6).

2. A hydroelectric power station tail water secondary power generation device according to claim 1, characterized in that: The transmission box (6) is hollow inside, and the upper end of the rotating shaft of the flipping guide plate (4) passes through the transmission box (6). The upper ends of the rotating shafts of the two flipping guide plates (4) corresponding to each guide seat (1) are respectively keyed and fixed with a driven gear (7) and a driving double-layer gear (8). The driven gear (7) and the lower gear of the driving double-layer gear (8) mesh and drive each other. The inner wall of the transmission box (6) is slidably connected with a driving rack (9) through a slide rail. The driving rack (9) meshes and drives the upper gear of the driving double-layer gear (8).

3. A hydroelectric power station tail water secondary power generation device according to claim 2, characterized in that: A drive motor (11) is fixedly installed on one side of the transmission box (6). A lead screw nut (10) is fixedly connected to the drive rack (9) on the side corresponding to the drive motor (11). The shaft of the drive motor (11) passes through the transmission box (6) and is fixedly connected to a drive screw. The drive screw and the lead screw nut (10) are threaded together for transmission.

4. A hydroelectric power station tail water secondary power generation device according to claim 1, characterized in that: A rubber contact pad is fixedly connected to the outer end of the side stop (5).

5. A hydroelectric power station tail water secondary power generation device according to claim 1, characterized in that: The inlet of the vertical axis turbine (12) corresponds to the rear side of the diversion cone (2), and the clean water inlet of the vertical axis turbine (12) is guided to the tangential direction of the impeller inside the vertical axis turbine (12).

6. A hydroelectric power station tail water secondary power generation device according to claim 1, characterized in that: The guide seat (1) is fixedly connected to a protective filter screen (3) on the side facing the incoming water.

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