A water-cycle power generation system

Abstract

This utility model relates to the field of power generation technology and discloses a water-circulating power generation system, comprising: a lower reservoir and an upper reservoir, the lower reservoir and the upper reservoir being connected by a power generation pipeline, so that water in the upper reservoir flows into the lower reservoir through the power generation pipeline, and the power generation pipeline is equipped with a conversion unit that converts water potential energy into electrical energy; a water lifting unit, disposed between the lower reservoir and the upper reservoir, for lifting water in the lower reservoir to the upper reservoir; and a drive unit, connected to the water lifting unit, for driving the water lifting unit to operate, thereby lifting water in the lower reservoir to the upper reservoir. This utility model can rely less on natural hydropower resources, and at the same time, the torque amplification module can reduce the power consumption of the drive motor, achieving the function of lifting large-mass objects with low power. Furthermore, this utility model has the characteristics of not requiring fuel combustion and being clean and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of power generation technology, specifically to a water-cycle power generation system. Background Technology

[0002] Existing power generation methods mainly include thermal power, hydropower, nuclear power, and wind power. Thermal power requires the burning of large amounts of fossil fuels such as coal and oil. On the one hand, energy resources are becoming increasingly scarce and are facing the danger of depletion; on the other hand, the combustion of fuels emits carbon and sulfur oxides, which deteriorates the Earth's environment. Wind power is expensive to produce and inconvenient to operate and use. Hydropower, as a renewable and clean energy source, typically stores energy during off-peak hours or utilizes natural water resources, such as through river drops. However, since many natural water resources depend on rainfall, the power generation during dry and wet seasons differs, resulting in significant limitations on natural water resources. This can lead to insufficient power generation when needed, or the inability to fully utilize resources during wet seasons due to the configuration of hydropower plants. Therefore, there is an urgent need to design a water-cycle power generation system that relies less on natural water resources. Utility Model Content

[0003] This invention provides a water-cycle power generation system to solve the above-mentioned problems.

[0004] This utility model is achieved through the following technical solution:

[0005] A water-cycle power generation system, comprising:

[0006] The lower reservoir and the upper reservoir are connected by a power generation pipeline, so that water in the upper reservoir flows into the lower reservoir through the power generation pipeline, and the power generation pipeline is equipped with a conversion unit that converts water potential energy into electrical energy.

[0007] A water lifting unit is installed between the lower water storage tank and the upper water storage tank to lift water from the lower water storage tank to the upper water storage tank.

[0008] A drive unit, connected to the water lifting unit, is used to drive the water lifting unit to operate, so as to lift the water in the lower water storage tank to the upper water storage tank.

[0009] As an optimization, the conversion unit is located below the interior of the power generation pipeline. The conversion unit includes a water turbine and a generator. The water turbine is installed below the interior of the power generation pipeline to convert the water potential energy into mechanical energy. The input end of the generator is connected to the output end of the water turbine to convert the mechanical energy of the water turbine into electrical energy. The output end of the generator is connected to the power grid and / or an energy storage device to transmit or store the electrical energy generated by the generator.

[0010] As an optimization, the water lifting unit includes a transmission chain, water buckets, support rollers, and a drive shaft for moving the transmission chain. Multiple support rollers are provided, and these rollers are arranged in an arc shape above the upper water storage tank and in the lower water storage tank. The transmission chain is connected to the outside of the support rollers. A sprocket is fixedly connected to the drive shaft, and the inner side of the transmission chain meshes with the sprocket, allowing the transmission chain to move cyclically through the support rollers and the drive shaft. Multiple water buckets are provided, and these buckets are evenly fixed to the transmission chain along its length, with the buckets located on the outer side of the loop formed by the transmission chain.

[0011] As an optimization, the drive shaft is provided with three shafts, namely a first drive shaft, a second drive shaft, and a third drive shaft arranged in a triangle. The first drive shaft, the second drive shaft, and the third drive shaft are connected by a drive chain. The first drive shaft and the second drive shaft are respectively located on the arc-shaped side above the upper water tank, closer to the upward movement of the water bucket, and on the arc-shaped side, closer to the downward movement of the water bucket. The third drive shaft is located below the first drive shaft and the second drive shaft, and the drive unit drives the third drive shaft to rotate.

[0012] As an optimization, two transmission chains are provided. Two sprockets are respectively provided on the first transmission shaft and the second transmission shaft. The two corresponding sprockets on the first transmission shaft and the second transmission shaft are respectively engaged with the two transmission chains, and the water bucket is fixedly connected to the two transmission chains respectively through a connector.

[0013] As an optimization, the drive unit includes a drive motor and a torque amplification module that amplifies the shaft torque of the drive motor. The output end of the drive motor is connected to the input end of the torque amplification module, and the output end of the torque amplification module is fixedly connected to the third transmission shaft, so that the third transmission shaft rotates.

[0014] As an optimization, the torque amplification module includes a hydraulic pump and a hydraulic motor. The input shaft of the hydraulic pump is connected to the output shaft of the drive motor through a transmission mechanism. The oil outlet of the hydraulic pump is connected to the oil inlet of the hydraulic motor through an outlet pressure pipeline, and the oil inlet of the hydraulic pump is connected to the oil outlet of the hydraulic motor through an inlet pressure pipeline.

[0015] As an optimization, the drive unit further includes a frequency converter, which is disposed at the input end of the drive motor.

[0016] As an optimization, the water bucket is made of a non-metallic hard material with a mass less than that of metal of the same volume and a hardness not less than that of metal. The water bucket is in the shape of a rectangular groove, and two adjacent sides of the side that contacts the connector are provided with reinforcing strips or reinforcing plates.

[0017] As an optimization, the end of the reinforcing strip or reinforcing plate near the connector is fixedly connected to the connector.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] This invention uses a water lifting unit to lift water to an upper reservoir for energy storage, which is not limited by rainfall and can rely less on natural water energy resources. At the same time, this invention is clean and environmentally friendly, requiring no fuel combustion. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a water-circulating power generation system according to this utility model from one of its positions;

[0022] Figure 2 This is a schematic diagram of the structure of a water-circulating power generation system according to this utility model from another angle;

[0023] Figure 3 A schematic diagram of the structure in which the water bucket is connected to the transmission chain via a connector;

[0024] Figure 4 This is a structural schematic diagram of the connector;

[0025] Figure 5 This is a schematic diagram of the water hopper structure;

[0026] Figure 6 A schematic diagram of one possible structure for connecting a water tank with reinforcing strips to a connector;

[0027] Figure 7 A schematic diagram of another structure for connecting a water hopper with reinforcing strips to a connector;

[0028] Figure 8 This is a top view of the upper reservoir and the conveyor chain.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 1-Transmission chain, 2-Water bucket, 3-Drive shaft, 3a-First drive shaft, 3b-Second drive shaft, 4-Support roller, 5-Lower reservoir, 6-Upper reservoir, 7-Power generation pipeline, 8-Water turbine, 9-Generator, 10-Drive motor, 11-Frequency converter, 12-Hydraulic pump, 13-Hydraulic motor, 14-Inlet pressure pipeline, 15-Outlet pressure pipeline, 16-Connecting piece, 17-Reinforcing strip, 18-Transmission chain. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0032] This embodiment 1 provides a water-cycle power generation system, including:

[0033] The lower reservoir 5 and the upper reservoir 6 are connected by a power generation pipe 7, so that water in the upper reservoir 6 flows into the lower reservoir 5 through the power generation pipe 7, and the power generation pipe 7 is equipped with a conversion unit that converts water potential energy into electrical energy.

[0034] The upper end of the power generation pipe 7 is located at the bottom of the upper reservoir 6 or below the side wall of the upper reservoir 6, and the lower end of the power generation pipe 7 is located below the side wall of the lower reservoir 5. This ensures that as long as there is water in the upper reservoir 6, it can flow from the bottom of the lower reservoir 5 to the lower reservoir 5 through the power generation pipe 7, so that the water in the lower reservoir 5 can be replenished relatively calmly (because the water flows into the lower reservoir 5 from the bottom, the impact of the water lifting unit that scoops water from the water surface of the lower reservoir 5 can be reduced). Figure 1 The rectangle representing the upper reservoir 6 and the lower reservoir 5 has a dashed upper side, representing the openings of the reservoirs. Valves can be installed in the power generation pipeline to control the flow of water in the upper reservoir by opening and closing the valves.

[0035] A water lifting unit is installed between the lower water storage tank 5 and the upper water storage tank 6 to lift water from the lower water storage tank 5 to the upper water storage tank 6.

[0036] A drive unit, connected to the water lifting unit, is used to drive the water lifting unit to lift water from the lower reservoir 5 to the upper reservoir 6.

[0037] In this technical solution, there is a certain height difference between the lower reservoir 5 and the upper reservoir 6. The drive unit drives the water lifting unit to rotate in a cycle. The water lifting unit transfers the water from the lower reservoir 5 to the upper reservoir 6 for energy storage. The water in the upper reservoir 6 flows down to the lower reservoir 5 through the power generation pipe 7. When the water flows from top to bottom in the power generation pipe 7, it passes through the conversion unit, which converts the water potential energy into electrical energy to achieve the power generation effect. When power generation is needed, the water flowing down from the upper reservoir 6 enters the lower reservoir 5 and is then lifted back to the upper reservoir 6 by the water lifting unit. This process is repeated to achieve the cyclic power generation process.

[0038] Next, we will introduce the structure of each of the above units in detail.

[0039] In some embodiments, the conversion unit is disposed below the interior of the power generation pipe 7. The conversion unit includes a water turbine 8 and a generator 9. The water turbine 8 is installed below the interior of the power generation pipe 7 and is used to convert the water potential energy into mechanical energy. The input end of the generator 9 is connected to the output end of the water turbine 8 and is used to convert the mechanical energy of the water turbine 8 into electrical energy. The output end of the generator 9 is connected to the power grid and / or an energy storage device for transmitting or storing the electrical energy generated by the generator 9.

[0040] It should be noted that the specific installation method of the water turbine 8 in the power generation pipeline 7 is common knowledge for those skilled in the art. For example, the inlet and outlet of the water turbine 8 are connected to the power generation pipeline 7, which will not be elaborated here.

[0041] The generator 9 is located outside the power generation pipe 7. The connection method between the generator 9 and the turbine 8 is also existing, such as a direct coupling connection: this is the most common connection method between the turbine 8 and the generator 9. In this method, the shafts of the turbine 8 and the generator 9 are directly connected together, and a coupling is used to ensure speed matching between the two. This connection method has a simple structure and high power transmission efficiency.

[0042] Indirect coupling connection: The turbine 8 and generator 9 are connected together via a reducer and a coupling. This method can solve the connection problem of large turbines 8 and generators 9 that cannot be solved by direct coupling. However, the power transmission efficiency will be reduced due to the use of the reducer and coupling.

[0043] Hydraulic coupling connection method: The turbine 8 and generator 9 are connected together via hydraulic transmission. This method enables automatic matching between the turbine 8 and generator 9, and also provides vibration damping and protection. However, due to the use of hydraulic transmission, the power transmission efficiency will be reduced.

[0044] Electromagnetic coupling connection method: The turbine 8 and generator 9 are connected together via electromagnetic transmission. This method enables automatic matching between the turbine 8 and generator 9, while avoiding the noise and vibration caused by mechanical transmission. However, due to the use of electromagnetic transmission, the power transmission efficiency will be reduced.

[0045] Therefore, in order to achieve higher power transmission efficiency, this invention adopts a direct coupling connection method.

[0046] In some embodiments, the water lifting unit includes a transmission chain 1, a water bucket 2, support rollers 4, and a drive shaft 3 for moving the transmission chain 1. Multiple support rollers 4 are provided, and several of the support rollers 4 are arranged in an arc shape (actually a semi-circular arc shape, such as...). Figure 1 As shown, the water tanks are distributed above the upper water tank 6 and in the lower water tank 5. The transmission chain 1 is connected to the outside of the support roller 4. A sprocket is fixedly connected to the drive shaft 3. The inner side of the transmission chain 1 meshes with the sprocket, so that the transmission chain 1 can move cyclically through the support roller 4 and the drive shaft 3. Several water buckets 2 are provided. Several water buckets 2 are evenly fixed on the transmission chain 1 along the length direction of the transmission chain 1, and the water buckets 2 are located on the outside of the circle formed by the transmission chain 1.

[0047] like Figure 1 As shown, according to Figure 1 The orientation of the support roller 4 can divide it into upper support roller 4 and lower support roller 4. Several upper support rollers 4 and the sprocket of the drive shaft 3 are tangent to the same downward-facing inner side of an arc, such as... Figure 1 Similarly, the upper arc (upper arc) in the middle, and several lower support rollers 4 are tangent to the same upward-facing inner side of the arc, as shown in the example. Figure 1 The lower arc is located in the middle. The transmission chain 1 is a ring shape with the ends connected. The ring-shaped transmission chain 1 is taut by the upper and lower arcs. That is, the length of the transmission chain 1 just meets the condition that the transmission chain 1 can be driven to move cyclically by the rotation of the transmission shaft 3.

[0048] The toothed side of the transmission chain 1 faces the inner side of the loop, allowing the sprocket to mesh with the teeth on the transmission chain 1. Thus, when the drive shaft 3 rotates, it drives the transmission chain 1 to move. From a macroscopic perspective, the entire transmission chain 1 moves in a circular motion, causing the water tank 2 to follow the path of: lower reservoir 5 → one side moving upwards → upper reservoir 6 → the other side moving downwards → lower reservoir 5 → one side moving upwards → upper reservoir 6… and so on, in a continuous cycle. It is important to note that the direction of movement of the transmission chain 1 is the same as the orientation of the opening of the water tank 2. For example… Figure 1 In the diagram, the dotted line representing hopper 2 indicates the opening of hopper 2. Hopper 2 can be understood as a container for scooping water. Figure 1 The direction of movement of the transmission chain 1 is as follows: the left side is the upward direction of the transmission chain 1 (on the left side, the opening of the water bucket 2 faces upward), and the right side is the downward direction of the transmission chain 1 (on the right side, the opening of the water bucket 2 faces downward).

[0049] Meanwhile, the distance between the transmission chain 1 on the upward moving side and the transmission chain 1 on the downward moving side should be no less than four times the depth of the water bucket 2. This increases the length of the arc, which, while maintaining a constant speed of transmission chain 1, allows for a longer water-pouring time for the water bucket 2 and reduces the transition section of the water bucket 2 above the upper reservoir 6 (i.e., Figure 1 The water bucket 2 opening changes from upward → upward to the right → horizontal → downward to the right → downward (corresponding to the location of the transmission chain 1). The water bucket 2 is no longer above the upper water storage tank 6 before the water in the water bucket 2 has been completely emptied.

[0050] It should also be noted that the upper water storage tank 6 is located between the transmission chain 1 on the upward moving side and the transmission chain 1 on the downward moving side, and the width of the upper water storage tank 6 ( Figure 1 The maximum spacing between the horizontal length of the upper and middle water storage tank 6 and the transmission chain 1 on the upward and downward sides (the transmission chain 1 on the upward and downward sides is parallel to each other, and both the transmission chain 1 on the upward and downward sides are vertically arranged, i.e., the upper and lower arcs are the same size) is matched, such as... Figure 8As shown, rolling rollers can be embedded in the side walls of the transmission chain 1 on the upper reservoir 6 near the upward and downward sides (grooves can be provided on the side walls, the rollers are rolled in the grooves, and a small part of the rollers is located outside the wall of the upper reservoir). The transmission chain 1 is slidably connected to the rollers. This minimizes the friction between the transmission chain 1 and the wall of the upper reservoir 6 while keeping the transmission chain 1 as close to the wall as possible. This ensures that when the water bucket 2 begins to tilt to the right to pour water, it pours as much water as possible onto the wall of the upper reservoir 6. The wall can be designed to slope downwards into the pool, maximizing the flow of water poured onto the wall into the pool. When the water bucket 2, located above the upper reservoir 6, moves with the transmission chain 1, all the water in the water bucket 2 is poured out, and then the empty water bucket 2 continues to move with the transmission chain 1 into the lower reservoir 5. Of course, rollers can be omitted, provided that the transmission chain is as close as possible to the wall of the upper reservoir.

[0051] The right-side transmission chain 1 (i.e., the transmission chain 1 on the downward direction) transfers the water bucket 2 to the lower reservoir 5. The transmission chain 1 continues to drive the water bucket 2 to move. As the opening of the water bucket 2 gradually changes from downward to left horizontal and finally to upward, the water bucket 2 scoops water from the lower reservoir 5 into its interior. When the water bucket 2 is at the bottom of the transmission chain 1, the water bucket 2 will be completely immersed in the water of the lower reservoir 5. As the water bucket 2 continues to move through the transmission chain 1, the water bucket 2 will gradually emerge from the lower reservoir 5 and rise above the water surface of the lower reservoir 5. At this time, the water bucket 2 will be filled with water and will transfer the water to the upper reservoir 6.

[0052] In some embodiments, three drive shafts 3 are provided, including a first drive shaft 3a, a second drive shaft 3b, and a third drive shaft 3c arranged in a triangle. The first drive shaft 3a, the second drive shaft 3b, and the third drive shaft 3c are connected by a drive chain 18. The first drive shaft 3a and the second drive shaft 3b are respectively located on the arc-shaped side above the upper water tank 6, near the upward movement of the water hopper 2, and on the arc-shaped side, near the downward movement of the water hopper 2. The third drive shaft 3c is located below the first drive shaft 3a and the second drive shaft 3b, and the drive unit drives the third drive shaft 3c to rotate.

[0053] The first drive shaft 3a and the second drive shaft 3b can be set at the same height, such as Figure 1 As shown.

[0054] If only one first drive shaft 3a is set for the heavy-load area (the area where the water bucket moves upward), there is a risk that the sprocket on the first drive shaft 3a may slip with the transmission chain 1. Slippage here refers to a problem in the meshing between gears or between the sprocket and the transmission chain 1, such as tooth wear or loose gear shafts, causing the gears to slip briefly during transmission and fail to transmit torque normally, similar to a stripped screw. This situation is commonly referred to as "gear / sprocket slippage." To reduce the risk of slippage between the sprocket on the first drive shaft 3a and the transmission chain 1, a second drive shaft 3b is set at the position near the unloaded area on the upper arc, specifically on the inner side of the upper arc on the right. The second drive shaft 3b also has a sprocket that meshes with the transmission chain 1. Simultaneously, a third drive shaft 3c is connected to the drive unit, which drives the third drive shaft 3c to rotate, thereby driving the first and second drive shafts to rotate. Other sprockets are also installed on the first, second, and third drive shafts to mesh with the drive chain 18.

[0055] In some embodiments, two transmission chains 1 are provided, and two sprockets that mesh with the transmission chains 1 are respectively provided on the first drive shaft and the second drive shaft. The two corresponding sprockets on the first drive shaft and the second drive shaft respectively mesh with the two transmission chains 1, and the water bucket 2 is fixedly connected to the two transmission chains 1 respectively through the connecting member 16. Figure 3-4 As shown, Figure 4 In the middle, the four circles represent four threaded holes or screw holes. Specifically, the two outermost holes are for fixing the connector 16 to the transmission chain 1, and the two middle holes are for fixing the connector 16 to the water bucket 2.

[0056] To ensure more stable water transfer in the water tank 2, two transmission chains 1 are installed. The water tank 2 has a cuboid structure, and the two transmission chains 1 are fixedly connected to the side wall along the length of the water tank 2 via connectors 16. Figure 5 As shown, This is the face where the opening is located, and AB is the length direction. Let BC be the width direction and BC be the depth direction. Then, the side ABCD... This is the side fixing connector 16.

[0057] In some embodiments, the water bucket 2 is made of a non-metallic hard material with a mass less than that of metal of the same volume and a hardness not less than that of metal, and the water bucket 2 is in the shape of a rectangular groove, and two adjacent sides of the side that contacts the connector 16 are provided with reinforcing strips 17 or reinforcing plates.

[0058] That is, the water tank 2 is made of non-metallic materials with high elastic modulus and lower density than metals, such as carbon fiber composites, engineering plastics, ceramic matrix composites, glass fiber reinforced plastics, etc.

[0059] Compared to the water bucket 2 which uses metal materials, this water lifting unit uses a non-metallic hard material with a mass less than that of metal of the same volume and a hardness no less than that of metal, which can reduce the overall weight of the water lifting unit.

[0060] Since the water lifting unit needs to be driven by the drive unit, the heavier the water lifting unit, the higher the power required by the drive unit for a given torque.

[0061] For example, the drive unit is a motor.

[0062] This is because of the relationship between power, torque, and speed: according to the power calculation formula... (Where P is power and T is torque,) (This refers to angular velocity). Given a constant torque T, to lift a heavy object, the power P that the motor needs to output is related to the angular velocity of the motor's rotation. Proportional.

[0063] The relationship between the weight of the object being lifted and the rotational speed: When the weight of the object being lifted increases, under the condition of a constant torque, the motor has to overcome a greater amount of gravity to do work, which will lead to an increase in the motor's rotational speed. The speed decreases (because the motor torque needs to balance the resistance torque generated by the weight of the object; the heavier the object, the greater the resistance torque, and the lower the motor speed). In order to maintain the speed of lifting the object, the motor needs to increase its output power to maintain or increase the speed to overcome the greater gravity.

[0064] Since the water bucket 2 is made of non-metallic material, it may still deform outwards (i.e., the side away from the transmission chain 1 (i.e., the outer side) deforms outwards). To reduce the deformation of the water bucket 2, on the two adjacent sides of the side that contacts the connector 16 (i.e., as well as It is equipped with reinforcing strips 17 or reinforcing plates.

[0065] like Figure 6 As shown, the reinforcing strip 17 can be arranged in an X-shape to reinforce the area. as well as On the side, the four endpoints of x correspond to the four corners of the side, while the reinforcing plate can be... as well as The shape and size of the side are matched. This reduces the possibility of deformation of the side of the water tank 2 facing away from the transmission chain 1.

[0066] Of course, for example, for On the side, only one reinforcing strip 17 may be provided, with one end of the reinforcing strip 17 connected to the opening surface (e.g. The angle (i.e., D) where the other end of the connector 16 intersects with the outer surface (e.g., ABCD) is fixed, and the other end contacts one side of the connector 16 (e.g., the water tank 2). )and The sides that intersect (i.e.) ( ) Fixed, meaning the other end can be located at Any position on the edge. The same applies to the side view.

[0067] In some embodiments, the end of the reinforcing strip 17 or reinforcing plate near the connector 16 is fixedly connected to the connector 16.

[0068] This allows the water tank 2 to be connected to the transmission chain 1 more stably while reducing deformation.

[0069] like Figure 7 As shown, in some embodiments, the connector 16 is located in the area near the opening of the water tank 2, i.e., the upper part of the water tank 2, which can make the water tank 2 more stable.

[0070] Next, we will introduce the structure of the drive unit in detail.

[0071] The drive unit includes a drive motor 10 and a torque amplification module that amplifies the rotational torque of the drive motor 10. The output end of the drive motor 10 is connected to the input end of the torque amplification module, and the output end of the torque amplification module is fixedly connected to the third transmission shaft 3c, so that the third transmission shaft 3c rotates.

[0072] As can be seen from the foregoing, the greater the output torque, the smaller the power required from the power supply equipment. Since there are multiple water buckets 2 in this invention, and they move cyclically with the transmission chain 1, it can be understood that the weight of all water buckets 2 on the upper side of the transmission chain 1 (assuming the water circulation power generation system is normal and without faults) fluctuates within a certain range. However, this range is relatively small compared to the weight of the entire water bucket 2, for the following reasons:

[0073] There are a relatively large number of hoppers 2: Generally speaking, there are a relatively large number of hoppers 2 used for circulating water lifting, which makes the weight change of individual hoppers 2 account for a relatively small proportion of the overall weight. For example, assuming there are 100 hoppers 2 in the whole system, even if the water holding capacity or weight of a few hoppers 2 changes to some extent, the impact on the total weight is limited relative to the total number.

[0074] Average effect: In a continuous cycle, although the weight of each bucket 2 may vary, these differences will cancel each other out to some extent over time. For example, at a certain moment, some buckets 2 may have more water, but at the same time, other buckets 2 may have less water, so that the total weight of all buckets 2 remains relatively stable.

[0075] System design stability: To ensure the normal operation of the water lifting system, the design aims to make the water scooping and pouring processes of the water buckets 2 relatively stable, thereby reducing large fluctuations in weight. For example, by rationally designing the shape and size of the water buckets 2 and controlling the movement speed of the transmission chain 1, the weight variation of each water bucket 2 during scooping and pouring is kept within a small range.

[0076] Therefore, the force required to lift the water within this range will also fluctuate within a certain range, and the corresponding motor power for this force needs to be determined according to specifications. Typically, this is based on the power formula... (Where P is power, F is force, and v is velocity), when lifting an object, the force F is equal to the object's weight. (Where m is the mass of the object and g is the acceleration due to gravity), when the object is lifted at a constant speed, F=G, therefore, Given constant v and g, the larger the mass m, the greater the power P required.

[0077] However, if the torque output of the drive motor 10 is amplified by the torque amplification module, it is possible to lift heavier objects with a fixed power P. In other words, if the mass of the object is fixed, amplifying the output torque of the drive motor 10 allows the use of a smaller power motor.

[0078] If a torque amplification module with high transmission efficiency (i.e. low energy loss) and a preset torque amplification factor is used to amplify the output torque of the drive motor 10, then the drive motor 10 with the lowest possible power can be used.

[0079] like Figure 2 As shown, in some embodiments, the torque amplification module includes a hydraulic pump 12 and a hydraulic motor 13. The input shaft of the hydraulic pump 12 is connected to the output shaft of the drive motor 10 through a transmission mechanism. The oil outlet of the hydraulic pump 12 is connected to the oil inlet of the hydraulic motor 13 through an outlet pressure pipeline 15. The oil inlet of the hydraulic pump 12 is connected to the oil outlet of the hydraulic motor 13 through an inlet pressure pipeline 14.

[0080] The torque amplification mainly depends on the displacement of the hydraulic motor 13 and the working pressure of the system. According to the formula... (where T is torque,) Let V be the pressure difference between the inlet and outlet of hydraulic motor 13, and V be the displacement of hydraulic motor 13. With a fixed displacement of hydraulic motor 13, a higher system pressure results in a greater output torque; conversely, with a fixed system pressure, selecting a larger displacement hydraulic motor 13 can also yield a greater torque. Therefore, a hydraulic system (hydraulic motor 13 + hydraulic pump 12) with a preset torque amplification factor is obtained. The hydraulic motor 13 and hydraulic pump 12 can be selected according to the actual situation.

[0081] To improve the transmission efficiency of a hydraulic system, one can select more optimized hydraulic components, which is common knowledge in the field and will not be elaborated further.

[0082] It should also be noted that the hydraulic pump 12 is an electric hydraulic pump 12, and both the drive motor 10 and the electric hydraulic pump 12 are existing electrical components, and their connection method is also existing technology. Furthermore, the transmission mechanism in this utility model includes couplings, belts, etc. For example, the article "Installation and Connection Methods of Hydraulic Pump 12 and Drive Motor 10" describes two installation methods for the hydraulic pump 12 and the drive motor: vertical and horizontal, as well as connection methods such as flange type, bracket type, and flange-bracket type. Therefore, the specific connection method between the drive motor 10 and the electric hydraulic pump 12 will not be described in detail here.

[0083] In some embodiments, the drive unit further includes a frequency converter 11, which is disposed at the input terminal of the drive motor 10.

[0084] The frequency converter 11 mainly serves to slow-start (soft-start) the drive motor 10, reducing the starting current of the drive motor 10 during startup and achieving a smooth start-up of the drive motor. At the same time, it adjusts the speed of the drive motor 10 during operation. By dynamically adjusting the motor speed through the frequency converter 11, the output flow of the hydraulic pump 12 is matched with the demand of the water lifting mechanism in real time.

[0085] Finally, it should be noted that the height difference and capacity between the upper and lower reservoirs 6 and 5, the inner diameter of the power generation pipe 7, the position of the turbine 8 within the power generation pipe, the volume of the water buckets 2, the material of the water buckets 2, the spacing between the water buckets 2, and the selection of the drive motor 10, hydraulic motor 13, hydraulic pump 12, turbine 8, and generator 9 can be set according to actual conditions or calculated through a limited number of experiments. The system must meet the following requirements: during normal operation of the water circulation power generation system of this utility model (e.g., during periods of low electricity prices (or low electricity consumption), when energy storage is performed, the water buckets lift water from the lower reservoir to the upper reservoir), the water in the lower reservoir 5 can be scooped to a set weight by any one of the water buckets 2, and the overall coefficient of the generator 9 and turbine 8 is high, resulting in a high conversion rate of water potential energy to electrical energy during the power generation period. This ensures the power generation of the generator 9 at every moment during power generation.

[0086] For example, the length, width and height of water bucket 2 are 1m, 0.5m and 0.5m respectively, the spacing between water buckets 2 is set to 0.2m, the spacing between the upper and lower transmission chains 1 is 2m, the upper and lower arcs are both semicircles, and the distance between the centers of the upper and lower arcs is 30m. The inner diameter of the power generation pipe 7 is 1m. By using these height spacings and combining them with flow rate calculation, the moving speed of water bucket 2 / transmission chain 1 that satisfies the cycle process can be calculated. This will not be elaborated further here.

[0087] Meanwhile, the hydraulic motor 13 and hydraulic pump 12 are selected from models with particularly high conversion efficiency and torque. In other words, the hydraulic system composed of the hydraulic motor 13 and hydraulic pump 12 can amplify the torque of the output shaft of the drive motor 10 to a great extent with low energy consumption. This allows the drive motor 10 with less power to drive the hydraulic pump 12 as much as possible.

[0088] It should also be noted that the support roller 4 can be fixed directly to the frame or to a concrete wall. The specific method used to fix the position of the support roller 4 depends on the actual situation. The connection between the support roller 4 and the frame or concrete wall is a rotatable connection, meaning that the support roller 4 can rotate when the transmission chain 1 passes through it. This reduces friction between the transmission chain 1 and the support roller 4, thus reducing wear on the transmission chain 1. Simultaneously, the end of the drive shaft 3 furthest from the drive unit is also rotatably connected to the bracket or wall via a bearing to support the drive shaft 3.

[0089] The location of the drive mechanism is on the platform above the upper reservoir 6, which will not be described in detail here.

[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water-cycle power generation system, characterized in that, include: The lower reservoir and the upper reservoir are connected by a power generation pipeline, so that water in the upper reservoir flows into the lower reservoir through the power generation pipeline, and the power generation pipeline is equipped with a conversion unit that converts water potential energy into electrical energy. A water lifting unit is installed between the lower water storage tank and the upper water storage tank to lift water from the lower water storage tank to the upper water storage tank. A drive unit, connected to the water lifting unit, is used to drive the water lifting unit to operate, so as to lift the water in the lower water storage tank to the upper water storage tank.

2. A water cycle power generation system according to claim 1, wherein The conversion unit is located below the interior of the power generation pipeline. The conversion unit includes a water turbine and a generator. The water turbine is installed below the interior of the power generation pipeline and is used to convert the water potential energy into mechanical energy. The input end of the generator is connected to the output end of the water turbine and is used to convert the mechanical energy of the water turbine into electrical energy. The output end of the generator is connected to the power grid and / or an energy storage device for transmitting or storing the electrical energy generated by the generator.

3. A water cycle power generation system according to claim 1, wherein The water lifting unit includes a transmission chain, water buckets, support rollers, and a drive shaft for moving the transmission chain. Multiple support rollers are arranged in an arc shape above the upper water tank and within the lower water tank. The transmission chain is connected to the outside of the support rollers. A sprocket is fixedly connected to the drive shaft, and the inner side of the transmission chain meshes with the sprocket, enabling the transmission chain to move cyclically via the support rollers and the drive shaft. Multiple water buckets are evenly fixed to the transmission chain along its length, and the water buckets are located on the outer side of the loop formed by the transmission chain.

4. A water cycle power generation system according to claim 3, wherein The drive shaft is provided in three parts, namely a first drive shaft, a second drive shaft and a third drive shaft arranged in a triangle. The first drive shaft, the second drive shaft and the third drive shaft are connected by a drive chain. The first drive shaft and the second drive shaft are respectively located on the arc-shaped side above the upper water tank, which is closer to the upward movement of the water bucket and the arc-shaped side, which is closer to the downward movement of the water bucket. The third drive shaft is located below the first drive shaft and the second drive shaft, and the drive unit drives the third drive shaft to rotate.

5. A water cycle power generation system according to claim 4, wherein The transmission chain is provided in two parts. Two sprockets are respectively provided on the first drive shaft and the second drive shaft. The two sprockets on the first drive shaft and the second drive shaft respectively mesh with the two transmission chains. The water bucket is fixedly connected to the two transmission chains respectively through a connector.

6. A water cycle power generation system according to claim 4 or 5, wherein The drive unit includes a drive motor and a torque amplification module that amplifies the torque of the drive motor shaft. The output end of the drive motor is connected to the input end of the torque amplification module, and the output end of the torque amplification module is fixedly connected to the third transmission shaft, so that the third transmission shaft rotates.

7. A water cycle power generation system according to claim 6, wherein The torque amplification module includes a hydraulic pump and a hydraulic motor. The input shaft of the hydraulic pump is connected to the output shaft of the drive motor through a transmission mechanism. The oil outlet of the hydraulic pump is connected to the oil inlet of the hydraulic motor through an outlet pipe. The oil inlet of the hydraulic pump is connected to the oil outlet of the hydraulic motor through an inlet pipe.

8. A water cycle power generation system according to claim 6 or 7, wherein The drive unit also includes a frequency converter, which is disposed at the input end of the drive motor.

9. A water-cycle power generation system according to claim 3, characterized in that, The water bucket is made of a non-metallic hard material with a mass less than that of metal of the same volume and a hardness not less than that of metal. The water bucket is in the shape of a rectangular groove, and two adjacent sides of the side that contacts the connector are provided with reinforcing strips or reinforcing plates.

10. A water-cycle power generation system according to claim 9, characterized in that, The reinforcing strip or reinforcing plate is fixedly connected to the connector at one end near the connector.

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