A tailrace channel for hydropower stations that can increase power generation

Abstract

This invention discloses a tailrace channel for hydropower stations that can improve power generation, belonging to the field of hydropower engineering technology. It includes a channel, flow-disrupting piers, a water collection component, a screening unit, and a conversion component. Cofferdams are set at both ends of the channel to form water storage sections, and the tail end has a 1-meter drop from the river channel. Flow-disrupting piers guide the water flow into the water collection component, which uses the Venturi effect to accelerate the water flow and impact the impeller rotation. The conversion component converts the impeller rotation into reciprocating linear motion through a crank-connecting rod mechanism, and then converts it into unidirectional continuous rotation to drive the generator to generate electricity through a gear rack and overrunning clutch. The screening unit automatically filters and cleans debris. This invention can transform the tailrace channel into a secondary energy recovery system, recovering and utilizing the residual kinetic and potential energy still carried by the tailwater for regeneration, realizing the cascade utilization of hydropower resources, and increasing economic benefits without increasing the load on the upstream reservoir or the losses of the main generator units.

Description

Technical Field

[0001] This invention relates to the field of tailrace channels for power plants, specifically a tailrace channel for hydropower plants that can increase power generation. Background Technology

[0002] Hydropower stations are important facilities that use water energy to generate electricity. The tailrace is a channel that discharges the tailwater of the power plant into the downstream riverbed and finally into the river. Its main function is to transport the water used for power generation back to the river. Its structure usually consists of inclined sections, curved sections and gentle sections.

[0003] However, traditional tailrace channel designs suffer from significant energy waste. Their design philosophy is rather crude, typically discharging tailwater from upstream reservoirs or power plants directly into downstream waterways without adequately utilizing the residual potential and kinetic energy carried by the tailwater itself. After passing through the turbine, the water still possesses a certain velocity (kinetic energy) and a drop in elevation relative to the downstream waterway (potential energy) as it flows downstream. This residual energy is not utilized in traditional designs and is directly consumed and wasted through impacts and friction with the downstream waterway, representing a substantial energy loss.

[0004] Therefore, there is an urgent need for a new tailrace system that can efficiently recover and utilize the energy of the tailrace of hydropower stations in order to improve the overall power generation efficiency and energy utilization rate of hydropower stations. Summary of the Invention

[0005] The purpose of this invention is to provide a tailrace channel for hydropower stations that can improve power generation, thereby solving the significant energy waste problem inherent in traditional tailrace channel designs mentioned in the background section. Traditional tailrace channel designs are rather crude, typically discharging tailwater from upstream reservoirs or power plants directly into downstream river channels, failing to fully utilize the residual potential and kinetic energy carried by the tailwater itself. After passing through the turbine, the water still possesses a certain velocity (kinetic energy) and a drop relative to the downstream river channel (potential energy) as it flows downstream in the tailrace channel. This residual energy is not utilized in traditional designs and is directly consumed and wasted through impact and friction with the downstream river channel, representing a significant energy loss. This invention transforms the tailrace channel into a secondary energy recovery system, recycling the residual kinetic and potential energy carried by the tailwater for regeneration, achieving cascade utilization of hydropower resources. Without increasing the load on the upstream reservoir or the losses of the main generator units, it directly improves the total power output and overall energy utilization rate of the hydropower station, increasing economic benefits.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tailrace channel for a hydropower station that can increase power generation, comprising,

[0007] The channel has cofferdams at both ends to form water storage sections, and the tail end of the channel is located above the river channel.

[0008] A flow-disrupting pier is installed on a channel. Both ends of the flow-disrupting pier are equipped with water-collecting components. An impeller is installed inside the water-collecting components. The impeller is connected to a generator through a conversion component to convert the mechanical energy of the water flow into electrical energy.

[0009] And a filtration unit, which is located at the middle of the upper end of the channel, is used to filter the water flowing into the channel to prevent debris and floating objects from entering and affecting subsequent energy recovery.

[0010] In a preferred embodiment: the number of the flow-dispersing piers is several, arranged at equal intervals, and at least two of the flow-dispersing piers have water flow channels between them and the cofferdam on the corresponding side. The water collection component includes a contraction section and a diffusion section, which are integrally formed and installed on the channel. A fixing plate is installed on the inner wall of the diffusion section, and a first rotating shaft is rotatably connected to the wall of the fixing plate. The impeller includes a drive shaft and blades, and the number of blades is several, all arranged circumferentially along the drive shaft. An angle is formed between the blades and the axis of the drive shaft. The end of the first rotating shaft away from the fixing plate is fixedly connected to the drive shaft.

[0011] In a preferred embodiment: the conversion component includes a rotating plate, a connecting assembly, a movable plate, a conversion box, a power generation assembly, a generator box, and a reinforcement assembly. The conversion box is installed on the diffuser section. The rotating plate is fixedly connected to the end of the first rotating shaft away from the drive shaft. The rotating plate is connected to a vertically sliding movable plate through the connecting assembly. The upper end of the movable plate penetrates the upper wall of the diffuser section and the lower wall of the conversion box, and is slidably connected to the diffuser section and the conversion box. The upper end of the movable plate is connected to a generator through the power generation assembly. The generator box, the power generation assembly, and the reinforcement assembly are all located inside the conversion box. The generator box is fixedly connected to the upper end of the movable plate, and the generator is installed inside the generator box.

[0012] In a preferred embodiment: the power generation assembly includes a rack, gears, a drive shaft, an overrunning clutch, and a driven shaft. One end of the generator housing is fixedly connected to a fixed frame. A plurality of symmetrically distributed second rotating shafts are rotatably connected within the fixed frame. Gears are fixedly connected to the outer walls of the second rotating shafts. Each of the gears meshes with a rack. The rack is fixedly installed inside a conversion box. One end of the first rotating shaft is fixedly connected to a drive shaft. An overrunning clutch is installed at one end of the drive shaft. The end of the overrunning clutch away from the drive shaft is connected to a driven shaft. The driven shaft is connected to the input shaft of the generator.

[0013] In a preferred embodiment: the connecting assembly includes an eccentric shaft, a connecting plate, and a movable shaft. The eccentric shaft is rotatably connected to the end wall of the rotating plate away from the first rotating shaft. One end of the connecting plate is rotatably connected to the outer wall of the eccentric shaft. The movable shaft is rotatably connected to the other end wall of the connecting plate. The movable shaft and the bottom end of the movable plate are rotatably connected.

[0014] In a preferred embodiment: the reinforcement component includes a first spherical block, a first connecting block, a lifting column, a second connecting block, a second spherical block, and an extension plate. The generator box has symmetrically distributed first spherical blocks rotatably connected to both sides. One end of the first spherical block is rotatably disposed within the first connecting block. One end of the first connecting block is fixedly connected to the extended end of the lifting column. The end of the lifting column away from the first connecting block is fixedly connected to the second connecting block. The second spherical block is rotatably disposed within the second connecting block. One end of the second spherical block is rotatably disposed within the extension plate. The extension plate is integrally formed with the inner wall of the conversion box.

[0015] In a preferred embodiment: the conversion box includes a first box body and a box cover, the inner wall of the box cover is provided with a rubber sealing ring, the box cover and the first box body are connected by a number of equally spaced fastening bolts, and the wall of the movable plate is provided with a sealing rubber strip.

[0016] In a preferred embodiment: the filtration unit includes a filter plate, a second housing, a filtration motor, a scraper, a collecting plate, and a transmission mechanism. The filter plate is installed on the channel, and the second housing is installed on the top of the filter plate. The filtration motor is installed inside the second housing. The filtration motor drives the scraper to reciprocate horizontally through the transmission mechanism. One end of the scraper is fixedly connected to the collecting plate. Both the collecting plate and the filter plate have a first opening, and a filter screen is installed in the first opening.

[0017] In a preferred embodiment: the transmission mechanism includes a threaded column fixedly connected to the output shafts on both sides of the filter motor, a nut threadedly connected to the outer wall of the threaded column, the lower end of the nut being slidably connected to the top of the filter plate, a third connecting block being fixedly connected to one end of the nut, a sliding plate being fixedly connected to one end of the third connecting block, the lower end of the sliding plate being fixedly connected to the scraper, and a second opening for the third connecting block to slide on the second housing.

[0018] In a preferred embodiment: the threaded post is made of austenitic stainless steel, and there is a 1-meter drop between the end plane of the channel and the horizontal plane of the river.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] Compared to the traditional, crude design concept of tailrace channels merely serving as drainage channels, this invention transforms the tailrace channel into a secondary energy recovery system. By recovering and utilizing the residual kinetic and potential energy carried by the tailwater for regeneration, it achieves the cascade utilization of hydropower resources. Without increasing the load on the upstream reservoir or the losses of the main generator units, it directly improves the total power output and overall energy utilization rate of the hydropower station, increasing economic benefits. The water collection components adopt a "contraction-diffusion" structure, accelerating the water flow in the contraction section, significantly increasing the impact kinetic energy of the water flow on the impeller. Simultaneously, the unique angle of attack design of the blades efficiently converts the kinetic energy of the water flow into rotational mechanical energy, resulting in a highly efficient energy conversion path and significantly improving the single-phase power generation. The energy recovery device improves capture efficiency by converting the impeller's uncertain rotational speed into regular reciprocating linear motion through a conversion component. Then, through gears, racks, and an overrunning clutch, it converts this into continuous rotational motion in a single direction, driving the generator to generate electricity stably. This adapts to changes in water flow velocity. The filtration unit not only has basic filtration functions but also achieves automatic cleaning and collection of debris through motor-driven scrapers and collection plates. This transforms the traditional passive clogging and manual cleaning mode into an automatic cleaning mode, reducing maintenance frequency and labor costs. It also avoids channel blockage or equipment damage caused by debris accumulation, ensuring long-term continuous and stable operation of the system under unattended or minimally staffed conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the tailrace channel of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall rear view structure of the tailrace channel of the present invention;

[0023] Figure 3 This is a top view of the distribution of the turbulence-disrupting piers in this invention;

[0024] Figure 4 This is a schematic diagram of the interior of the conversion box in this invention;

[0025] Figure 5 This is a side view of the conversion component in this invention.

[0026] Figure 6 For the present invention Figure 5 Enlarged structural diagram;

[0027] Figure 7 This is a schematic diagram of the interior of the second housing in this invention;

[0028] Figure 8 This is a schematic diagram of the overall side sectional view of the tailrace channel in this invention;

[0029] Figure 9 This is a schematic diagram of the scraper structure in this invention;

[0030] In the diagram: 1. Channel; 2. Cofferdam; 3. Baffle; 4. Impeller; 5. Water flow channel; 6. Contraction section; 7. Diffusion section; 8. Fixed plate; 9. First rotating shaft; 10. Drive shaft; 11. Blade; 12. Rotating plate; 13. Moving plate; 14. Conversion box; 15. Generator box; 16. Rack; 17. Gear; 18. Drive shaft; 19. Overrunning clutch; 20. Driven shaft; 21. Fixed frame; 22. 23. Second rotating shaft; 24. Eccentric shaft; 25. Connecting plate; 26. Moving shaft; 27. First spherical block; 28. First connecting block; 29. ​​Lifting column; 20. Second spherical block; 31. Box cover; 32. Filter plate; 33. Second box body; 34. Filter motor; 35. Scraper; 36. Collection plate; 37. Filter screen; 38. Threaded column; 39. Nut; 40. Third connecting block; 41. Slide plate; 42. Second opening. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 , Figure 2 , Figure 3 and Figure 8 One embodiment provided by the present invention:

[0033] A tailrace channel for a hydropower station that can increase power generation includes,

[0034] Channel 1 has cofferdams 2 at both ends to form water storage sections for stabilizing water level and flow pattern. The tail end of Channel 1 is located above the river channel, with a 1-meter drop between the plane of the tail end of Channel 1 and the horizontal plane of the river channel. This 1-meter drop creates a "free outflow" condition, ensuring that the water level in Channel 1 is not disturbed by changes in the downstream water level. This provides a stable and predictable water flow environment for the flow disturbance piers 3 and water collection components, ensuring that the impeller 4 can be continuously impacted by the water flow at the designed velocity, thereby stabilizing power generation and preventing fluctuations in the downstream water level (such as due to rainfall, operation of other power stations, etc.) from directly "backing up" or even backflowing into Channel 1, which would seriously affect the flow velocity and flow pattern of the water in Channel 1.

[0035] The turbulence dam 3 is installed on the channel 1. Both ends of the turbulence dam 3 are equipped with water collection components. The water collection components are equipped with impellers 4. The impellers 4 are connected to the generator through the conversion component to convert the mechanical energy of the water flow into electrical energy.

[0036] And a screening unit, which is located at the middle of the upper end of channel 1, is used to filter the water flowing into channel 1 to prevent debris and floating objects from entering and affecting subsequent energy recovery.

[0037] Please see Figure 1 , Figure 3 and Figure 5 In this embodiment, there are several turbulence-disrupting piers 3, which are arranged at equal intervals. At least two of the turbulence-disrupting piers 3 have water flow channels 5 between them and the cofferdam 2 on the corresponding side to prevent water stagnation. The water collection component includes a contraction section 6 and a diffusion section 7. The contraction section 6 and the diffusion section 7 are integrally formed and are both installed on the channel 1. A fixing plate 8 is installed on the inner wall of the diffusion section 7. A first rotating shaft 9 is rotatably connected to the wall of the fixing plate 8. The impeller 4 includes a drive shaft 10 and blades 11. There are several blades 11, which are all arranged circumferentially along the drive shaft 10. An angle is formed between the blades 11 and the axis of the drive shaft 10 to efficiently capture water flow energy. The end of the first rotating shaft 9 away from the fixing plate 8 is fixedly connected to the drive shaft 10.

[0038] When in use, the "Venturi effect" is used to accelerate the water flow in the contraction section 6, so that the water flow impacts the blades 11 with an angle of attack with higher kinetic energy, thereby efficiently converting the water flow energy into the rotational mechanical energy of the impeller 4, which significantly improves the energy capture efficiency. The contraction-diffusion structural design not only accelerates the water flow but also helps to restore some pressure and reduce energy loss, making the impeller 4 start up faster and run more stably.

[0039] Please see Figure 4 and Figure 5 In this embodiment, the conversion component includes a rotating plate 12, a connecting assembly, a movable plate 13, a conversion box 14, a power generation assembly, a generator box 15, and a reinforcing assembly. The conversion box 14 is mounted on the diffuser section 7. The rotating plate 12 is fixedly connected to the end of the first rotating shaft 9 away from the drive shaft 10. The rotating plate 12 is connected to the vertically sliding movable plate 13 through the connecting assembly. The upper end of the movable plate 13 penetrates the upper wall of the diffuser section 7 and the lower wall of the conversion box 14, and is slidably connected to the diffuser section 7 and the conversion box 14. The upper end of the movable plate 13 is connected to the generator box 15 through the power generation assembly. The motor, generator box 15, power generation components, and reinforcement components are all housed in the conversion box 14. The upper end of the movable plate 13 is fixedly connected to the generator box 15. The generator is installed in the generator box 15. The first motion form conversion is achieved through the conversion component, namely "rotation → reciprocating linear motion". This conversion is achieved through a clever crank-connecting rod mechanism (rotating plate 12, connecting components), which transforms the uncertain rotation speed of the impeller 4 (which may be due to changes in water flow rate) into a regular and controllable linear motion, laying the foundation for subsequent stable power generation.

[0040] Please see Figure 5 and Figure 6In this embodiment, the power generation component includes a rack 16, a gear 17, a drive shaft 18, an overrunning clutch 19, and a driven shaft 20. One end of the generator housing 15 is fixedly connected to a fixed frame 21. Several symmetrically distributed second rotating shafts 22 are rotatably connected inside the fixed frame 21. Gears 17 are fixedly connected to the outer wall of the second rotating shafts 22. The multiple gears 17 are meshed with the rack 16. The rack 16 is fixedly installed inside the conversion box 14. One end of the first rotating shaft 9 is fixedly connected to the drive shaft 18. One end of the drive shaft 18 is equipped with an overrunning clutch 19. The end of the overrunning clutch 19 away from the drive shaft 18 is connected to the driven shaft 20. The driven shaft 20 is connected to the input shaft of the generator.

[0041] When the moving plate 13 moves up and down, it drives the generator box 15 to move up and down, which in turn drives the fixed frame 21 to move up and down. As the fixed frame 21 moves up and down, the gear 17 rolls along the rack 16, thus forcing the generation of bidirectional rotational motion. Then, using the core component "overrunning clutch 19", the bidirectional rotation is filtered into continuous rotation in a single direction.

[0042] Please see Figure 5 In this embodiment, the connecting assembly includes an eccentric shaft 23, a connecting plate 24, and a movable shaft 25. The eccentric shaft 23 is rotatably connected to the wall of the rotating plate 12 away from the first rotating shaft 9. One end of the connecting plate 24 is rotatably connected to the outer wall of the eccentric shaft 23. The movable shaft 25 is rotatably connected to the other end of the connecting plate 24. The movable shaft 25 and the bottom end of the movable plate 13 are rotatably connected. In use, as the rotating plate 12 rotates, it drives the eccentric shaft 23 to rotate. Then, under the action of the connecting plate 24 and the movable shaft 25, and under the limitation of the movable plate 13 in the diffusion section 7 and the conversion box 14, the movable plate 13 begins to move up and down in a straight line.

[0043] Please see Figure 4 and Figure 5 In this embodiment, the reinforcement component includes a first spherical block 26, a first connecting block 27, a lifting column 28, a second connecting block, a second spherical block 29, and an extension plate. The generator box 15 is rotatably connected to both sides of the symmetrically distributed first spherical blocks 26. One end of the first spherical block 26 is rotatably disposed in the first connecting block 27. One end of the first connecting block 27 is fixedly connected to the extended end of the lifting column 28. The end of the lifting column 28 away from the first connecting block 27 is fixedly connected to the second connecting block. The second spherical block 29 is rotatably disposed in the second connecting block. One end of the second spherical block 29 is rotatably disposed in the extension plate. The extension plate is integrally formed with the inner wall of the conversion box 14. During the power generation process, the reinforcement component increases the stability of the entire transmission system through its multi-spherical hinge and lifting column 28 structure.

[0044] Please see Figure 1In this embodiment, the conversion box 14 includes a first box body and a box cover 30. A rubber sealing ring is provided on the inner wall of the box cover 30. The box cover 30 and the first box body are connected by a number of equally spaced fastening bolts. A sealing rubber strip is provided on the wall of the movable plate 13.

[0045] Please see Figure 1 , Figure 7 and Figure 9 In this embodiment, the filtration unit includes a filter plate 31, a second housing 32, a filtration motor 33, a scraper 34, a collection plate 35, and a transmission mechanism. The filter plate 31 is installed on the channel 1, and the second housing 32 is installed on the top of the filter plate 31. The filtration motor 33 is installed inside the second housing 32. The filtration motor 33 drives the scraper 34 to move horizontally and reciprocally through the transmission mechanism. One end of the scraper 34 is fixedly connected to the collection plate 35. Both the collection plate 35 and the filter plate 31 have a first opening. A filter screen 36 is installed in the first opening. The filtration motor 33 is connected to the power station's auxiliary power system through a power supply cable to ensure that it receives a continuous and stable power supply and realizes the automatic cleaning function.

[0046] In use, after the filter plate 31 filters impurities, the filter motor 33 drives the threaded column 37 to rotate, which in turn drives the two scrapers 34 to move relative to each other under the action of the slide plate 40, pushing the impurities filtered on the filter plate 31 to both sides. At the same time, the collection plate 35 intercepts and collects the impurities scraped off by the scrapers 34 during their movement. Finally, the impurities accumulated on both sides of the dike 2 can be collected in a unified manner. The filter plate 31 is responsible for initially intercepting large debris, while the motor-driven scrapers 34 and the collection plate 35 constitute an automatic cleaning system that actively scrapes the intercepted debris off the filter surface and accumulates it in a designated area, realizing the automation and continuity of the filtration process. This avoids the problem of easy clogging of the traditional filter screen 36 and the need for frequent manual cleaning, thus reducing maintenance costs.

[0047] Please see Figure 2 , Figure 7 and Figure 9 In this embodiment, the transmission mechanism includes a threaded column 37 fixedly connected to the output shafts on both sides of the filter motor 33. A nut 38 is threadedly connected to the outer wall of the threaded column 37. The lower end of the nut 38 is slidably connected to the top of the filter plate 31. A third connecting block 39 is fixedly connected to one end of the nut 38. A sliding plate 40 is fixedly connected to one end of the third connecting block 39. The lower end of the sliding plate 40 is fixedly connected to the scraper 34. A second opening 41 is provided on the second housing 32 for the third connecting block 39 to slide.

[0048] Please see Figure 7 In this embodiment, the threaded post 37 is made of austenitic stainless steel, preferably 316 stainless steel.

[0049] It should be noted that, in order to ensure the stable operation of each electrical component of the present invention, the power supply and control of all electrical equipment in the system (including the filter motor 33 in the screening unit and the generator in the energy recovery section) are connected to the inherent power system and control system of the hydropower station. Specifically, the filter motor 33 of the screening unit is electrically connected to the power system of the hydropower station through a power supply cable (not shown). The power supply cable can be laid along the channel 1 or related structural components to provide the filter motor 33 with AC power that meets its rated voltage and power. The start and stop of the filter motor 33 can be remotely controlled by the central control room of the hydropower station, or automatically controlled by a timer / water level difference sensor, etc., preset in the second box 32.

[0050] S1. Water flow guidance and pretreatment:

[0051] The tailwater from the generator set's power output first flows into channel 1. The cofferdams 2 at both ends of channel 1 form a storage section, stabilizing the water level and smoothing the flow, creating stable hydraulic conditions for subsequent energy recovery. Before entering the energy recovery area, the water flows through a filter unit located at the top of channel 1. Filter plates 31 intercept impurities in the water, ensuring that subsequent components such as the impeller 4 are not blocked or damaged. At this time, the filter motor 33 drives the threaded column 37 to rotate, causing the nut 38 and scraper 34 to move reciprocally, thus removing the impurities intercepted by the filter plates 31. The collecting plate 35 scrapes water to both sides of the cofferdam 2, keeping the filtration surface unobstructed. As the filtered water continues to flow in the channel 1, it encounters multiple turbulence piers 3. These turbulence piers 3 redistribute and guide the water flow. Part of the water flow is guided to the water collection components set at both ends of the turbulence piers 3, while the other part falls directly into the river from the water flow channel 5. Water that has undergone preliminary conversion into electrical energy by the water collection mechanism also continues to flow into the river. Compared with the conventional method of directly discharging upstream reservoir water into the river, this device can reuse the tailwater to generate electricity, increasing the power generation.

[0052] S2. Hydropower Acquisition and Conversion:

[0053] The guided water flow enters the constriction section 6 of the water collection component. According to the Venturi effect, the water flow accelerates here and gains higher kinetic energy. It then impacts the blades 11 of the impeller 4. The high-speed water flow generates a strong thrust on the inclined blades 11, driving the impeller 4, its drive shaft 10, and the first rotating shaft 9 to rotate together. Thus, the mechanical energy of the water flow is initially collected and converted into rotational mechanical energy.

[0054] S3, Mechanical energy transfer and stable power generation:

[0055] As the first rotating shaft 9 rotates, it drives the rotating plate 12 at its top to rotate. The rotating plate 12, through a crank-connecting rod mechanism consisting of an eccentric shaft 23, a connecting plate 24, and a moving shaft 25, converts the continuous rotational motion into the up-and-down reciprocating linear motion of the moving plate 13. The moving plate 13 drives the generator box 15 and the gear 17 installed on it to move up and down together. The gear 17 meshes with the rack 16 fixedly installed on the conversion box 14. When the gear 17 moves up and down with the moving plate 13, it is forced to rotate. Through the setting of the overrunning clutch 19, no matter whether the gear 17 rotates clockwise or counterclockwise, the rotational power transmitted to the generator input shaft is always in the same direction and continuous. The generator generates electrical energy. Finally, the electrical energy generated by the stably driven generator is sent to the supporting energy storage system (such as a battery) or the power grid for storage and utilization, thereby achieving the ultimate goal of increasing the total power generation of the hydropower station.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tailrace for a hydroelectric power plant that improves power generation, characterized by, include, The channel has cofferdams at both ends to form water storage sections, and the tail end of the channel is located above the river channel. A flow-disrupting pier is installed on a channel. Both ends of the flow-disrupting pier are equipped with water-collecting components. An impeller is installed inside the water-collecting components. The impeller is connected to a generator through a conversion component to convert the mechanical energy of the water flow into electrical energy. And a filtration unit, which is located at the middle of the upper end of the channel, is used to filter the water flowing into the channel to prevent debris and floating objects from entering and affecting subsequent energy recovery. The number of the flow-dispersing piers is several, arranged at equal intervals, and at least two of the flow-dispersing piers have water flow channels between them and the cofferdam on the corresponding side. The water collection component includes a contraction section and a diffusion section, which are integrally formed and installed on the channel. A fixing plate is installed on the inner wall of the diffusion section, and a first rotating shaft is rotatably connected to the wall of the fixing plate. The impeller includes a drive shaft and blades, and the number of blades is several, all arranged circumferentially along the drive shaft. An angle is formed between the blades and the axis of the drive shaft. The end of the first rotating shaft away from the fixing plate is fixedly connected to the drive shaft. The conversion component includes a rotating plate, a connecting assembly, a movable plate, a conversion box, a power generation assembly, a generator box, and a reinforcement assembly. The conversion box is installed on the diffuser section. The rotating plate is fixedly connected to the end of the first rotating shaft away from the drive shaft. The rotating plate is connected to a vertically sliding movable plate through the connecting assembly. The upper end of the movable plate penetrates the upper wall of the diffuser section and the lower wall of the conversion box, and is slidably connected to the diffuser section and the conversion box. The upper end of the movable plate is connected to a generator through the power generation assembly. The generator box, the power generation assembly, and the reinforcement assembly are all located inside the conversion box. The upper end of the movable plate is fixedly connected to the generator box, and the generator is installed inside the generator box. The reinforcement assembly includes a first spherical block, a first connecting block, a lifting column, a second connecting block, a second spherical block, and an extension plate. The generator box has symmetrically distributed first spherical blocks rotatably connected to both sides. One end of the first spherical block is rotatably disposed within the first connecting block. One end of the first connecting block is fixedly connected to the extended end of the lifting column. The end of the lifting column away from the first connecting block is fixedly connected to the second connecting block. The second spherical block is rotatably disposed within the second connecting block. One end of the second spherical block is rotatably disposed within the extension plate. The extension plate is integrally formed with the inner wall of the conversion box.

2. The tailrace channel for a hydropower station that can increase power generation according to claim 1, characterized in that: The power generation assembly includes a rack, gears, a drive shaft, an overrunning clutch, and a driven shaft. A fixed frame is fixedly connected to one end of the generator housing. Several symmetrically distributed second rotating shafts are rotatably connected within the fixed frame. Gears are fixedly connected to the outer walls of the second rotating shafts. Each of the gears meshes with a rack. The rack is fixedly installed inside the conversion box. A drive shaft is fixedly connected to one end of the first rotating shaft. An overrunning clutch is installed at one end of the drive shaft. The end of the overrunning clutch away from the drive shaft is connected to a driven shaft. The driven shaft is connected to the input shaft of the generator.

3. The tailrace channel for a hydropower station that can increase power generation according to claim 1, characterized in that: The connecting assembly includes an eccentric shaft, a connecting plate, and a movable shaft. The eccentric shaft is rotatably connected to the wall of the rotating plate away from the first rotating shaft. One end of the connecting plate is rotatably connected to the outer wall of the eccentric shaft. The movable shaft is rotatably connected to the other end of the connecting plate. The movable shaft and the bottom end of the movable plate are rotatably connected.

4. A tailrace channel for a hydropower station that can increase power generation according to claim 1, characterized in that: The conversion box includes a first box body and a box cover. The inner wall of the box cover is provided with a rubber sealing ring. The box cover and the first box body are connected by a number of equally spaced fastening bolts. The wall of the movable plate is provided with a sealing rubber strip.

5. A tailrace channel for a hydropower station that can increase power generation according to claim 1, characterized in that: The filtration unit includes a filter plate, a second housing, a filter motor, a scraper, a collecting plate, and a transmission mechanism. The filter plate is installed on the channel, and the second housing is installed on the top of the filter plate. The filter motor is installed inside the second housing. The filter motor drives the scraper to reciprocate horizontally through the transmission mechanism. One end of the scraper is fixedly connected to the collecting plate. Both the collecting plate and the filter plate have a first opening, and a filter screen is installed in the first opening.

6. A tailrace channel for a hydropower station that can increase power generation according to claim 5, characterized in that: The transmission mechanism includes a threaded column fixedly connected to the output shafts on both sides of the filter motor. A nut is threadedly connected to the outer wall of the threaded column. The lower end of the nut is slidably connected to the top of the filter plate. A third connecting block is fixedly connected to one end of the nut. A sliding plate is fixedly connected to one end of the third connecting block. The lower end of the sliding plate is fixedly connected to the scraper. A second opening is provided on the second housing for the third connecting block to slide.

7. A tailrace channel for a hydropower station that can increase power generation according to claim 6, characterized in that: The threaded column is made of austenitic stainless steel, and there is a 1-meter drop between the end plane of the channel and the horizontal plane of the river.

Images