A gravity energy storage system

Abstract

The present application relates to the field of energy generation, and discloses a gravity energy storage system. The gravity energy storage system comprises a first storage module, a second storage module, a lifting module, a power generation module and a plurality of mass units. The first storage module is used for storing mass units after energy release. The second storage module is arranged above the first storage module and is used for storing mass units after energy storage. The lifting module is used for lifting the mass units after energy release from the first storage module to the second storage module, so that the mass units complete energy storage. When the mass units after energy storage fall from the second storage module to the first storage module to release energy, the power generation module is used for energy exchange with the mass units, so that the gravitational potential energy of the mass units is converted into the electric energy of the power generation module. The present application uses gravitational potential energy for energy storage and release, so that energy storage is realized at a lower cost, and the economy of the whole system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy power generation, and in particular to a gravity energy storage system. BACKGROUND

[0002] In recent years, with the continuous decrease of various fossil energy reserves, and the continuous intensification of environmental factors such as global warming, energy replacement and environmental problems have attracted great attention. In order to achieve near-zero carbon emissions worldwide, it is necessary to vigorously develop renewable energy such as water energy, wind energy and solar energy.

[0003] However, due to the influence of the natural environment, renewable energy power generation is unstable, and the cost of energy storage and release of the existing energy storage system for renewable energy is too high, which affects the subsequent grid connection transmission and water power consumption, and the economy of the entire system is poor. SUMMARY

[0004] Based on the above problems, the purpose of the present application is to provide a gravity energy storage system which can store energy at a lower cost and improve the economy of the entire system.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A gravity energy storage system comprises:

[0007] a plurality of mass units;

[0008] a first storage module for storing the mass units after releasing energy;

[0009] a second storage module arranged above the first storage module, the second storage module being used for storing the mass units after storing energy;

[0010] a lifting module for lifting the mass units after releasing energy from the first storage module to the second storage module, so that the mass units complete energy storage;

[0011] a power generation module for exchanging energy with the mass units when the mass units after storing energy fall from the second storage module to the first storage module to release energy, so that the gravitational potential energy of the mass units is converted into electric energy of the power generation module.

[0012] As a preferred scheme of the gravity energy storage system, the first storage module comprises a plurality of first conveying frames, each of which is provided with a rotatable first driving roller for driving the mass unit to move on the first conveying frame; and the second storage module comprises a plurality of second conveying frames, each of which is provided with a rotatable second driving roller for driving the mass unit to move on the second conveying frame.

[0013] As a preferred scheme of the gravity energy storage system, each of the first conveying frames is further provided with a first driven roller, and a plurality of the first driven rollers are arranged between adjacent two first driving rollers; and each of the second conveying frames is further provided with a second driven roller, and a plurality of the second driven rollers are arranged between adjacent two second driving rollers.

[0014] As a preferred scheme of the gravity energy storage system, the first driving rollers, the second driving rollers, the first driven rollers and the second driven rollers are respectively arranged at least two in an axial direction, and an avoiding groove for avoiding the lifting module is arranged between two adjacent first driving rollers, two adjacent second driving rollers, two adjacent first driven rollers and two adjacent second driven rollers in the axial direction.

[0015] As a preferred scheme of the gravity energy storage system, the center of gravity of the mass unit is located between adjacent first driving rollers and first driven rollers; and / or, the center of gravity of the mass unit is located between two adjacent first driven rollers; and / or, the center of gravity of the mass unit is located between adjacent second driving rollers and second driven rollers; and / or, the center of gravity of the mass unit is located between two adjacent second driven rollers.

[0016] As a preferred scheme of the gravity energy storage system, each of the first conveying frames is further provided with a first guide roller, and the first guide roller is in rolling connection with the mass unit; and each of the second conveying frames is further provided with a second guide roller, and the second guide roller is in rolling connection with the mass unit.

[0017] As a preferred scheme of the gravity energy storage system, the lengths of the plurality of first conveying frames and the plurality of second conveying frames are equal; or, the lengths of the plurality of first conveying frames and the plurality of second conveying frames decrease successively from bottom to top.

[0018] As a preferred embodiment of the gravity energy storage system of the present invention, the lifting module and / or the power generation module includes a hook structure, the mass unit is provided with a slot, and the hook structure includes a telescopic mechanism; the telescopic mechanism can be engaged into the slot under the action of gravity to lock the hook structure and the mass unit; the telescopic mechanism can also be disengaged from the slot under the action of external force to unlock the hook structure and the mass unit.

[0019] As a preferred embodiment of the gravity energy storage system of the present invention, the hook structure further includes a housing, and the telescopic mechanism can extend out of the housing under the action of gravity and engage with the slot; the telescopic mechanism can also retract into the housing under the action of external force and disengage from the slot.

[0020] As a preferred embodiment of the gravity energy storage system of the present invention, the telescopic mechanism includes a bracket, a trigger rod, a connecting rod, and a locking block. The trigger rod is slidably disposed on the bracket, and the locking block is rotatably disposed on the bracket. One end of the connecting rod is rotatably connected to the trigger rod, and the other end is rotatably connected to the locking block. The locking block can be flipped outward relative to the bracket under the action of gravity to engage with the slot. The trigger rod can drive the locking block to flip inward relative to the bracket through the connecting rod to disengage the locking block from the slot.

[0021] As a preferred embodiment of the gravity energy storage system of the present invention, the slot includes a guide slot and a limiting slot that are connected to each other. The locking block can be flipped inward relative to the bracket under the guidance of the guide slot so that the telescopic mechanism can be inserted into the limiting slot. The locking block can be flipped outward relative to the bracket under the action of gravity so as to engage with the limiting slot.

[0022] As a preferred embodiment of the gravity energy storage system of the present invention, it further includes a steering unit, which is used to change the conveying direction of the mass unit on the first storage module or the second storage module.

[0023] As a preferred embodiment of the gravity energy storage system of the present invention, the steering unit includes a first steering roller, a second steering roller and a base. The base is disposed on the first storage module and / or the second storage module. The arrangement directions of the first steering roller and the second steering roller are perpendicular. The mass unit can be conveyed along a first direction on the first steering roller. When steering, the first steering roller stops and the second steering roller starts, so that the mass unit is conveyed along a second direction.

[0024] Alternatively, the steering unit includes a first steering roller, a base, and a steering seat. The base is disposed on the first storage module and / or the second storage module, and the steering seat is rotatably disposed on the base. A plurality of first steering rollers are distributed in parallel on the steering seat. The mass unit is conveyed through the first steering rollers. When steering, rotating the steering seat can cause the first steering rollers to turn, thereby realizing the steering of the mass unit conveying direction.

[0025] As a preferred embodiment of the gravity energy storage system of the present invention, the lifting module includes a first track, a first lifting machine and a first traction cable, wherein the first lifting machine is slidably disposed on the first track and the first traction cable is suspended from the output end of the first lifting machine.

[0026] As a preferred embodiment of the gravity energy storage system of the present invention, the lifting module includes a first transport box, a first hoist and a first traction cable. The first transport box is used to receive the mass unit of the first storage module, and the first hoist can lift the first transport box from the first storage module to the second storage module via the first traction cable.

[0027] As a preferred embodiment of the gravity energy storage system of the present invention, the first transport box is also used to push the mass unit to the second storage module.

[0028] As a preferred embodiment of the gravity energy storage system of the present invention, the power generation module includes a second track, a second hoist, and a second traction cable. The second hoist is slidably disposed on the second track, and the second traction cable is suspended from the output end of the second hoist.

[0029] As a preferred embodiment of the gravity energy storage system of the present invention, the power generation module includes a second transport box, a second hoist, and a second traction cable. The second transport box is used to receive the mass unit of the second storage module, and the second hoist can lower the second transport box from the second storage module to the first storage module via the second traction cable.

[0030] As a preferred embodiment of the gravity energy storage system of the present invention, the second transport box is also used to push the mass unit onto the first storage module.

[0031] As a preferred embodiment of the gravity energy storage system of the present invention, the lifting module and the power generation module are an integrated module; the integrated module includes a track, a hoist, and a traction cable, the hoist being slidably disposed on the track, and the hoist being able to lift or lower the mass unit via the traction cable; or, the integrated module includes a transport box, a hoist, and a traction cable, the hoist being able to lift or lower the transport box via the traction cable, and the transport box being used to accommodate the mass unit.

[0032] The beneficial effects of this invention are as follows:

[0033] The gravity energy storage system provided by this invention stores energy-released mass units in a first storage module and energy-stored mass units in a second storage module. A lifting module lifts the energy-released mass units from the first storage module to the second storage module, enabling the mass units to complete energy storage. When an energy-stored mass unit descends from the second storage module to the first storage module to release energy, an energy exchange occurs between the mass unit and a power generation module, converting the gravitational potential energy of the mass unit into electrical energy for the power generation module. This system utilizes gravitational potential energy for energy storage and release, achieving energy storage at a lower cost and improving the overall economic efficiency of the system. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the gravity energy storage system of the first structural form provided in the specific embodiments of the present invention before energy storage;

[0036] Figure 2 This is a schematic diagram of the first structural form of the gravity energy storage system provided in the specific embodiments of the present invention in energy storage;

[0037] Figure 3 This is a schematic diagram of the structure of the gravity energy storage system of the first structural form provided in the specific embodiments of the present invention after energy storage;

[0038] Figure 4 This is a schematic diagram of the structure of the frame in the gravity energy storage system provided in a specific embodiment of the present invention;

[0039] Figure 5 This is a top view schematic diagram of the frame in the gravity energy storage system provided in a specific embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the gravity energy storage system of the second structural form provided in a specific embodiment of the present invention before energy storage;

[0041] Figure 7 This is a schematic diagram of the second structural form of the gravity energy storage system provided in the specific embodiments of the present invention in energy storage;

[0042] Figure 8 This is a schematic diagram of the structure of the gravity energy storage system of the second structural form provided in the specific embodiment of the present invention after energy storage;

[0043] Figure 9 This is a top view schematic diagram of a portion of the structure of the first storage module (or the second storage module) in the gravity energy storage system of the second structural form provided in a specific embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of the gravity energy storage system of the third structural form provided in the specific embodiments of the present invention before energy storage;

[0045] Figure 11 This is a schematic diagram of the third structural form of the gravity energy storage system provided in the specific embodiments of the present invention in energy storage;

[0046] Figure 12 This is a schematic diagram of the third structural form of the gravity energy storage system provided in the specific embodiments of the present invention after energy storage;

[0047] Figure 13 This is a schematic diagram of the mass unit and hook structure in the gravity energy storage system provided by a specific embodiment of the present invention;

[0048] Figure 14 This is a top view of the first storage module (or second storage module), mass unit, and first structural form of steering unit in the gravity energy storage system provided by a specific embodiment of the present invention;

[0049] Figure 15 This is a top view of the first storage module (or second storage module), mass unit, and first structural form of steering unit (when part of the steering unit carries the mass unit) in the gravity energy storage system provided by a specific embodiment of the present invention;

[0050] Figure 16 This is a top view of the steering unit of the first structural form in the gravity energy storage system provided by a specific embodiment of the present invention;

[0051] Figure 17 This is a top view of the steering unit of the second structural form in the gravity energy storage system provided in a specific embodiment of the present invention.

[0052] In the picture:

[0053] 1-First storage module; 2-Second storage module; 3-Lifting module; 4-Power generation module; 5-Mass unit; 6-Hook structure; 7-Steering unit; 8-Frame;

[0054] 11-First conveyor frame; 12-First driving roller; 13-First driven roller; 14-First guide roller; 15-Allowing groove;

[0055] 21-Second conveyor frame; 22-Second driving roller; 23-Second driven roller; 24-Second guide roller;

[0056] 31-First track; 32-First hoist; 33-First traction cable; 34-First transport box; 341-First pusher roller;

[0057] 41-Second track; 42-Second hoist; 43-Second traction cable; 44-Second transport box; 441-Second pusher roller;

[0058] 51-Card slot; 511-Guide groove; 512-Limiting groove;

[0059] 61-Housing; 62-Telescopic mechanism; 621-Bracket; 622-Trigger rod; 623-Connecting rod; 624-Locking block;

[0060] 71-First steering roller; 72-Second steering roller; 73-Base; 74-Strobe seat;

[0061] 81-Vertical column; 82-Horizontal beam; 83-Roller support; 84-Shock-absorbing pad. Detailed Implementation

[0062] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail 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.

[0063] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0065] like Figures 1 to 17 As shown, this embodiment provides a gravity energy storage system, which includes a first storage module 1, a second storage module 2, a lifting module 3, a power generation module 4, and several mass units 5. The first storage module 1 stores the mass units 5 after releasing energy. The second storage module 2 is positioned above the first storage module 1 and stores the mass units 5 that have already stored energy. The lifting module 3 lifts the mass units 5 from the first storage module 1 to the second storage module 2, allowing the mass units 5 to complete energy storage. When the mass units 5 with stored energy descend from the second storage module 2 to the first storage module 1 to release energy, the power generation module 4 exchanges energy with the mass units 5, converting the gravitational potential energy of the mass units 5 into electrical energy for the power generation module 4. This utilizes gravitational potential energy for energy storage and release, achieving energy storage at a lower cost and improving the overall system's economic efficiency.

[0066] Specifically, the first storage module 1 may include a plurality of first conveyor frames 11, each of which is equipped with a rotatable first drive roller 12. The first drive roller 12 is used to drive the mass unit 5 to move on the first conveyor frame 11. The first drive roller 12 can be driven by a motor or other drive method. Several first drive rollers 12 can be set and kept rotating synchronously by a synchronous belt. The plurality of first conveyor frames 11 can be arranged along the height direction. The first conveyor frames 11 can be set horizontally. The plurality of first drive rollers 12 are arranged horizontally on the first conveyor frames 11 to facilitate stable horizontal transport of the mass unit 5, so that the mass unit 5 moves from the end of the first conveyor frame 11 near the lifting module 3 to the end of the first conveyor frame 11 near the power generation module 4.

[0067] Optionally, each first conveyor frame 11 is also provided with a first driven roller 13, and a number of first driven rollers 13 are provided between two adjacent first driving rollers 12, thereby ensuring that the mass unit 5 always rolls in contact with the first driving roller 12 and / or the first driven roller 13 when it moves on the first conveyor frame 11, reducing frictional resistance and lowering energy consumption and conveying costs.

[0068] To prevent the mass unit 5 from deviating from the preset movement path on the first conveyor frame 11, optionally, each first conveyor frame 11 is also provided with a first guide roller 14. The first guide roller 14 is tumbling connected to the mass unit 5. The first guide roller 14 can be set on both sides of the preset movement path of the mass unit 5 to limit and guide the mass unit 5.

[0069] The structure and working principle of the second storage module 2 can be the same as those of the first storage module 1. The second storage module 2 includes several second conveyor frames 21, each equipped with a rotatable second drive roller 22. The second drive roller 22 is used to move the mass unit 5 along the second conveyor frame 21. The second drive roller 22 can be driven by a motor or other drive mechanism. Several second drive rollers 22 can be installed and kept rotating synchronously by a synchronous belt. The several second conveyor frames 21 can be arranged along the height direction, and the second conveyor frames 21 can be horizontally positioned. The several second drive rollers 22 arranged horizontally on the second conveyor frames 21 facilitate stable horizontal transport of the mass unit 5, allowing the mass unit 5 to move from the end of the second conveyor frame 21 near the lifting module 3 to the end of the second conveyor frame 21 near the power generation module 4.

[0070] Each second conveyor frame 21 is also equipped with a second driven roller 23, and several second driven rollers 23 are arranged between two adjacent second driving rollers 22. This ensures that the mass unit 5 is always in rolling contact with the second driving roller 22 and / or the second driven roller 23 when moving on the second conveyor frame 21, reducing frictional resistance and lowering energy consumption and conveying costs. Each second conveyor frame 21 is also equipped with a second guide roller 24, which is in rolling connection with the mass unit 5. The second guide roller 24 can be arranged on both sides of the preset movement path of the mass unit 5 to limit and guide the mass unit 5, thereby preventing the mass unit 5 from deviating from the preset movement path on the second conveyor frame 21.

[0071] like Figures 1 to 3 As shown, the lengths of several first conveyor frames 11 and several second conveyor frames 21 can decrease sequentially from bottom to top, and the overall arrangement of the first conveyor frames 11 and several second conveyor frames 21 can be trapezoidal. Two first conveyor frames 11 can be set up in two layers. The first layer of first conveyor frames 11 can hold 13 mass units 5 simultaneously, and the second layer can hold 11 mass units 5 simultaneously. Four second conveyor frames 21 can be set up in four layers. The first layer of second conveyor frames 21 can hold 9 mass units 5 simultaneously, the second layer can hold 7 mass units 5 simultaneously, the third layer can hold 5 mass units 5 simultaneously, and the fourth layer can hold 3 mass units 5 simultaneously. Therefore, the total number of mass units 5 that can be placed on two first conveyor frames 11 is the same as the total number of mass units 5 that can be placed on four second conveyor frames 21, improving space utilization and reducing the floor space required.

[0072] It should be noted that, Figures 1 to 3 Only the first conveyor frame 11 and the second conveyor frame 21 are shown in one dimension. In practical applications, the first conveyor frame 11 and the second conveyor frame 21 can be compared with... Figures 1 to 3 The extension is shown in the vertical dimension of the plane. That is, the first storage module 1 may include multiple rows and multiple layers of first conveyor racks 11, and the second storage module 2 may include multiple rows and multiple layers of second conveyor racks 21. It is understood that the lifting module 3, the power generation module 4, and the mass unit 5 also need to be correspondingly expanded in quantity.

[0073] like Figure 4 and Figure 5 As shown, the frame 8 includes vertical columns 81 and horizontal beams 82. The vertical columns 81 are made of pure steel or a hybrid structure of steel and concrete, while the horizontal beams 82 are made of steel, mainly H-beams and I-beams. To eliminate stress damage caused by thermal expansion and contraction, the horizontal beams 82 and vertical columns 81 are bolted together, with space reserved for deformation and expansion.

[0074] To increase the bending resistance of the first driving roller 12, the first driven roller 13, the second driving roller 22, and the second driven roller 23, all three rollers are hollow. Both ends of the first driving roller 12, the first driven roller 13, the second driving roller 22, and the second driven roller 23 are mounted on the crossbeam 82 via roller supports 83. Shock-absorbing pads 84 are provided below the roller supports 83 to buffer and eliminate the impact and vibration generated during the transport of the mass unit 5, maintaining the balance of the gravity energy storage system. Power lines are located behind the first guide roller 14 and the second guide roller 24. These power lines are further away from the mass unit 5 than the first guide roller 14 and the second guide roller 24, and are additionally protected to prevent damage to the power lines.

[0075] To meet the maintenance requirements after the gravity energy storage system is put into operation, there is a certain distance requirement between the layers of the first storage module 1 and the second storage module 2. This distance must ensure that the mass unit 5 can pass through while also allowing maintenance personnel to reach the maintenance points. When arranging the first driving roller 12, the first driven roller 13, the second driving roller 22, and the second driven roller 23, it should be ensured that the center of gravity of the mass unit 5 falls within the two roller support points in contact with the mass unit 5, preventing the mass unit 5 from tilting or tipping over. That is, the center of gravity of the mass unit 5 is located between adjacent first driving rollers 12 and first driven rollers 13; and / or, the center of gravity of the mass unit 5 is located between two adjacent first driven rollers 13; and / or, the center of gravity of the mass unit 5 is located between adjacent second driving rollers 22 and second driven rollers 23; and / or, the center of gravity of the mass unit 5 is located between two adjacent second driven rollers 23.

[0076] like Figures 6 to 8 As shown, the lengths of the plurality of first conveyor frames 11 and the plurality of second conveyor frames 21 can also be equal. It should be noted that when the lifting module 3 interferes with the first driven roller 13, as... Figure 9 As shown, two first driven rollers 13 can be spaced apart, forming a clearance groove 15 between the two first driven rollers 13 to avoid the lifting module 3. That is, at least two first driving rollers 12, second driving rollers 22, first driven rollers 13, and second driven rollers 23 are spaced apart axially, and clearance grooves 15 for avoiding the lifting module 3 are provided between two adjacent first driving rollers 12, two second driving rollers 22, two first driven rollers 13, and two second driven rollers 23. In other embodiments, the above two methods can be combined in a reasonable way to adapt to the application requirements of specific on-site scenarios. Furthermore, in some other embodiments, the lengths of the plurality of first conveyor frames 11 and the plurality of second conveyor frames 21 may not decrease sequentially from bottom to top, nor may they be equal, depending on the space of the on-site application scenario, and are not limited here.

[0077] It is understandable that the gravity energy storage system may only employ the first conveyor frame 11 and the second conveyor frame 21 of the first structural form (e.g., Figures 1 to 3 The arrangement shown, or only the first conveyor frame 11 and the second conveyor frame 21 of the second structural form (as shown) Figures 6 to 8 The arrangement shown, or only the first conveyor frame 11 and the second conveyor frame 21 of the third structural form (as shown) Figures 10 to 12 The arrangement shown is as described above. This gravity energy storage system can also freely combine and arrange the first conveyor frame 11 and the second conveyor frame 21 of the first, second, and third structural forms according to actual application scenarios; no limitations are imposed here.

[0078] like Figures 1 to 9 As shown, the lifting module 3 may include a first track 31, a first lifting machine 32, and a first traction cable 33. The first lifting machine 32 is slidably mounted on the first track 31, and the first traction cable 33 is suspended from the output end of the first lifting machine 32. The gravity energy storage system also includes a frame 8. The first track 31 can be horizontally mounted on the frame 8 to facilitate adjustment of the horizontal position of the first lifting machine 32. Specifically, the position adjustment of the first lifting machine 32 on the first track 31 can be achieved through a movable base 73 with a drive motor. The height and horizontal position adjustment of the mass unit 5 at the end of the first traction cable 33 are achieved by adjusting the height position of the mass unit 5 via the first lifting machine 32.

[0079] Or, such as Figures 10 to 12 As shown, the lifting module 3 may also include a first transport box 34, a first lifting machine 32, and a first traction cable 33. The first transport box 34 is used to receive the mass unit 5 of the first storage module 1. The first lifting machine 32 can lift the first transport box 34 from the first storage module 1 to the second storage module 2 via the first traction cable 33. The first transport box 34 is also used to push the mass unit 5 onto the second storage module 2. Using the first transport box 34 can ensure safety during the lifting process of the mass unit 5. To facilitate the receiving and pushing of the mass unit 5, a rotatable first pushing roller 341 is provided inside the first transport box 34.

[0080] like Figures 1 to 9As shown, the power generation module 4 may include a second track 41, a second hoist 42, and a second traction cable 43. The second hoist 42 is slidably mounted on the second track 41, and the second traction cable 43 is suspended from the output end of the second hoist 42. The second track 41 can be horizontally mounted on the frame 8 to facilitate adjustment of the horizontal position of the second hoist 42. Specifically, the position adjustment of the second hoist 42 on the second track 41 can be achieved through a movable base 73 with a drive motor. By adjusting the height position of the mass unit 5 at the end of the second traction cable 43 through the second hoist 42, the height and horizontal position adjustment of the mass unit 5 can be achieved. When the mass unit 5 descends, the mass unit 5 drives the motor of the second hoist 42 to rotate through the second traction cable 43, realizing the power generation function, so that the gravitational potential energy of the mass unit 5 is converted into electrical energy of the second hoist 42.

[0081] Or, such as Figures 10 to 12 As shown, the power generation module 4 may also include a second transport box 44, a second hoist 42, and a second traction cable 43. The second transport box 44 is used to receive the mass unit 5 of the second storage module 2. The second hoist 42 can lower the second transport box 44 from the second storage module 2 to the first storage module 1 via the second traction cable 43. The second transport box 44 is also used to push the mass unit 5 onto the first storage module 1. Using the second transport box 44 can ensure safety during the descent of the mass unit 5. To facilitate the receiving and pushing of the mass unit 5, a rotatable second pushing roller 441 is provided inside the second transport box 44.

[0082] It should be noted that the first hoist 32 includes a first power conversion device and a first drum. The first power conversion device drives the first drum to rotate, and the first drum is connected to the first traction cable 33. The second hoist 42 includes a second power conversion device and a second drum. The second power conversion device drives the second drum to rotate, and the second drum is connected to the second traction cable 43. The first power conversion device and the second power conversion device can be a combination of a generator and a motor, or a permanent magnet motor integrating a generator and a motor.

[0083] A generator is a mechanical device that converts other forms of energy into electrical energy. Driven by a water turbine, steam turbine, diesel engine, or other power machinery, it converts the energy generated by water flow, airflow, or fuel combustion into mechanical energy, which is then transferred to the generator and converted into electrical energy. There are many types of generators, but their working principle is based on the laws of electromagnetic induction and electromagnetic force. Therefore, the general principle of their construction is to use appropriate magnetic and conductive materials to form mutually inductive magnetic and electrical circuits to generate electromagnetic power and achieve energy conversion. A generator typically consists of a stator, rotor, end covers, and bearings. The stator consists of a stator core, winding coils, a frame, and other structural components that fix these parts. The rotor consists of a rotor core (or magnetic poles, yoke), windings, retaining rings, a center ring, slip rings, a fan, and a shaft. The bearings and end covers connect and assemble the generator's stator and rotor, allowing the rotor to rotate within the stator and cut magnetic lines of force, thereby generating an induced electromotive force (EMF). This EMF is then led out through terminals and connected to a circuit, producing a current.

[0084] An electric motor is a device that converts electrical energy into mechanical energy. It utilizes a rotating magnetic field generated by a current-carrying coil (stator winding) that acts on the rotor (such as a squirrel-cage closed aluminum frame) to create magnetoelectric torque. Electric motors are classified into DC motors and AC motors based on the power source they use. Most motors in power systems are AC motors, which can be synchronous or asynchronous (the stator magnetic field speed and rotor rotation speed are not synchronized). An electric motor mainly consists of a stator and a rotor. The direction of the force on a current-carrying conductor in a magnetic field depends on the direction of the current and the direction of the magnetic field lines. The working principle of an electric motor is that the magnetic field exerts a force on the current, causing the motor to rotate.

[0085] When the first power conversion device acts as a motor, the motor drives the first drum through the rotor, and then lifts the energy storage device from the energy release position to the energy storage position through the first traction cable 33. When the second power conversion device acts as a generator, the energy storage device drives the second drum through the second traction cable 43 when it descends, and then generates electrical energy by cutting the magnetic field of the stator through the rotor. The gravitational potential energy of the energy storage device is finally converted into the electrical energy of the generator.

[0086] Under certain conditions, generators and motors can be interchangeable. A generator can be used as either a motor or a generator. For example, the permanent magnet motor most commonly used in new energy vehicles is an integrated unit that can drive the wheels and generate electricity. This type of motor can both drive the vehicle and generate electricity. The BSG motor mounted on the engine is also reversible. When three-phase voltage is input to the stator coils, a rotating magnetic field is generated. Under the repulsive force of like phases, the permanent magnet rotor rotates passively, thus functioning as a motor. When the permanent magnet rotor rotates under the action of external forces, current is induced in the three-phase coils of the stator, thus functioning as a generator. However, the two modes cannot operate simultaneously; when used as a motor, it cannot be used as a generator, and vice versa.

[0087] To improve energy saving and reduce energy loss during braking, deceleration energy is recovered and fed back to the power grid, achieving energy conservation and environmental protection. The first and second power conversion devices can utilize permanent magnet motors equipped with four-quadrant frequency converters. Four-quadrant frequency converters meet the needs of various industrial applications, and are particularly suitable for applications with large inertia potential energy loads, such as lifting and hoisting equipment, where the rotational inertia is large, the deceleration from high speed to low speed is significant, the braking time is short, and strong braking effects are required, or for applications requiring long-term heavy-load electrical braking.

[0088] It is understandable that the lifting module 3 and the power generation module 4 have the two optional forms mentioned above. The lifting module 3 and the power generation module 4 can be the same or different, and can be freely combined according to the actual application scenario.

[0089] In another embodiment, the lifting module 3 and the power generation module 4 can be an integrated module with two operating modes: lifting mode and power generation mode. The integrated module may include a track, a hoist, and a traction cable. The hoist is slidably mounted on the track and can lift or lower the mass unit 5 via the traction cable. Alternatively, the integrated module may include a transport box, a hoist, and a traction cable. The hoist can lift or lower the transport box, which is used to house the mass unit 5, via the traction cable. When the hoist is used as a motor, the integrated module is in lifting mode; when the hoist is used as a generator, the integrated module is in power generation mode. Figure 13As shown, the lifting module 3 and / or the power generation module 4 may further include a hook structure 6, which can be connected to the first traction cable 33 or the second traction cable 43. The mass unit 5 is provided with a slot 51. The hook structure 6 includes a housing 61 and a telescopic mechanism 62. The telescopic mechanism 62 can extend out of the housing 61 under gravity and engage with the slot 51 to lock the hook structure 6 and the mass unit 5; the telescopic mechanism 62 can also retract into the housing 61 under external force and disengage from the slot 51 to unlock the hook structure 6 and the mass unit 5. Through the telescopic mechanism 62, a detachable and quick connection between the hook structure 6 and the mass unit 5 is achieved, improving operational efficiency.

[0090] Specifically, the telescopic mechanism 62 may include a bracket 621, a trigger rod 622, a connecting rod 623, and a locking block 624. The trigger rod 622 is slidably mounted on the bracket 621, and the locking block 624 is rotatably mounted on the bracket 621. One end of the connecting rod 623 is rotatably connected to the trigger rod 622, and the other end is rotatably connected to the locking block 624. The locking block 624 can rotate outward relative to the bracket 621 under the action of gravity to engage with the slot 51. The trigger rod 622 can drive the locking block 624 to rotate inward relative to the bracket 621 through the connecting rod 623, so that the locking block 624 disengages from the slot 51. When the locking block 624 rotates inward relative to the bracket 621, the housing 61 and the bracket 621 can be combined to form a closed and complete outer shell.

[0091] Furthermore, the slot 51 may include a connected guide slot 511 and a limiting slot 512. Under the guidance of the guide slot 511, the locking block 624 can rotate inward relative to the bracket 621 so that the telescopic mechanism 62 extends into the limiting slot 512. Under the action of gravity, the locking block 624 can rotate outward relative to the bracket 621 to engage with the limiting slot 512. The guide slot 511 may be conical and have a through-slot structure, while the limiting slot 512 may be arc-shaped and have a blind slot structure. The opening of the limiting slot 512 is larger than the lower opening of the guide slot 511, which facilitates the engagement of the locking block 624 with the limiting slot 512.

[0092] like Figure 14 and Figure 15 As shown, the gravity energy storage system may also include a steering unit 7, which is used to change the conveying direction of the mass unit 5 on the first storage module 1 or the second storage module 2. Figure 16 As shown, the steering unit 7 may include a first steering roller 71, a second steering roller 72, and a base 73. The base 73 is disposed on the first storage module 1 and / or the second storage module 2. The first steering roller 71 and the second steering roller 72 are arranged perpendicularly. When the mass unit 5 is on the first steering roller 71, it is conveyed along the first direction. When a steering change is required, the first steering roller 71 stops, and the second steering roller 72 starts, so that the mass unit 5 is conveyed along the second direction. Figure 17As shown, the steering unit 7 may also include a first steering roller 71, a base 73, and a steering seat 74. The base 73 is disposed on the first storage module 1 and / or the second storage module 2. The steering seat 74 is rotatably disposed on the base 73. Several first steering rollers 71 are distributed in parallel on the steering seat 74. The mass unit 5 is conveyed through the first steering rollers 71. When a steering is required, the first steering rollers 71 are turned by rotating the steering seat 74, thereby changing the direction of conveying the mass unit 5.

[0093] It should be noted that the entire gravity energy storage system can be placed in a sealed shell to protect the internal components, which require dustproof, windproof and rainproof protection.

[0094] The gravity energy storage system provided in this embodiment stores the released energy mass unit 5 in the first storage module 1 and the stored energy mass unit 5 in the second storage module 2. The released energy mass unit 5 in the first storage module 1 is lifted to the second storage module 2 by the lifting module 3 so that the mass unit 5 completes energy storage. When the stored energy mass unit 5 falls from the second storage module 2 to the first storage module 1 to release energy, the power generation module 4 exchanges energy with the mass unit 5 so that the gravitational potential energy of the mass unit 5 is converted into electrical energy of the power generation module 4. Thus, the gravitational potential energy is used for energy storage and release, and energy storage is carried out at a lower cost, which improves the economy of the entire system.

[0095] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A gravity energy storage system, characterized in that, include: Several mass units (5); The first storage module (1) is used to store the mass unit (5) after the energy is released. The second storage module (2) is disposed above the first storage module (1), and the second storage module (2) is used to store the mass unit (5) with stored energy. The lifting module (3) is used to lift the mass unit (5) after the energy is released from the first storage module (1) to the second storage module (2) so that the mass unit (5) can complete energy storage; When the mass unit (5) with stored energy falls from the second storage module (2) to the first storage module (1) to release energy, the power generation module (4) is used to exchange energy with the mass unit (5) so that the gravitational potential energy of the mass unit (5) is converted into the electrical energy of the power generation module (4). The first storage module (1) includes a plurality of first conveyor frames (11), each of which is provided with a rotatable first drive roller (12), which is used to drive the mass unit (5) to move on the first conveyor frame (11); the second storage module (2) includes a plurality of second conveyor frames (21), each of which is provided with a rotatable second drive roller (22), which is used to drive the mass unit (5) to move on the second conveyor frame (21); Each of the first conveyor frames (11) is also provided with a first driven roller (13), and a plurality of first driven rollers (13) are provided between two adjacent first driving rollers (12); each of the second conveyor frames (21) is also provided with a second driven roller (23), and a plurality of second driven rollers (23) are provided between two adjacent second driving rollers (22). The center of gravity of the mass unit (5) is located between the adjacent first driving roller (12) and the first driven roller (13); and / or, the center of gravity of the mass unit (5) is located between two adjacent first driven rollers (13); and / or, the center of gravity of the mass unit (5) is located between the adjacent second driving roller (22) and the second driven roller (23); and / or, the center of gravity of the mass unit (5) is located between two adjacent second driven rollers (23).

2. The gravity energy storage system according to claim 1, characterized in that, The first driving roller (12), the second driving roller (22), the first driven roller (13) and the second driven roller (23) are respectively arranged at least two along the axial direction. A clearance groove (15) for avoiding the lifting module (3) is provided between two adjacent first driving rollers (12), two second driving rollers (22), two first driven rollers (13) and two second driven rollers (23).

3. The gravity energy storage system according to claim 1, characterized in that, Each of the first conveyor frames (11) is also provided with a first guide roller (14), which is tumblingly connected to the mass unit (5); each of the second conveyor frames (21) is also provided with a second guide roller (24), which is tumblingly connected to the mass unit (5).

4. The gravity energy storage system according to claim 1, characterized in that, The lengths of the first conveyor frame (11) and the second conveyor frame (21) are all equal; or the lengths of the first conveyor frame (11) and the second conveyor frame (21) decrease sequentially from bottom to top.

5. The gravity energy storage system according to claim 1, characterized in that, The lifting module (3) and / or the power generation module (4) include a hook structure (6), and the mass unit (5) is provided with a slot (51). The hook structure (6) includes a telescopic mechanism (62). The telescopic mechanism (62) can be engaged in the slot (51) under the action of gravity to lock the hook structure (6) and the mass unit (5). The telescopic mechanism (62) can also disengage from the slot (51) under the action of external force to unlock the hook structure (6) and the mass unit (5).

6. The gravity energy storage system according to claim 5, characterized in that, The hook structure (6) also includes a housing (61), and the telescopic mechanism (62) can extend out of the housing (61) under the action of gravity and be engaged in the slot (51); the telescopic mechanism (62) can also retract into the housing (61) under the action of external force and disengage from the slot (51).

7. The gravity energy storage system according to claim 5, characterized in that, The telescopic mechanism (62) includes a bracket (621), a trigger rod (622), a connecting rod (623), and a locking block (624). The trigger rod (622) is slidably disposed on the bracket (621), and the locking block (624) is rotatably disposed on the bracket (621). One end of the connecting rod (623) is rotatably connected to the trigger rod (622), and the other end is rotatably connected to the locking block (624). The locking block (624) can be flipped outward relative to the bracket (621) under the action of gravity to engage with the slot (51). The trigger rod (622) can drive the locking block (624) to flip inward relative to the bracket (621) through the connecting rod (623) so that the locking block (624) disengages from the slot (51).

8. The gravity energy storage system according to claim 7, characterized in that, The slot (51) includes a guide slot (511) and a limiting slot (512) that are connected. The locking block (624) can be flipped inward relative to the bracket (621) under the guidance of the guide slot (511) so that the telescopic mechanism (62) can be inserted into the limiting slot (512). The locking block (624) can be flipped outward relative to the bracket (621) under the action of gravity so as to engage with the limiting slot (512).

9. The gravity energy storage system according to claim 1, characterized in that, It also includes a steering unit (7) for changing the conveying direction of the mass unit (5) on the first storage module (1) or the second storage module (2).

10. The gravity energy storage system according to claim 9, characterized in that, The steering unit (7) includes a first steering roller (71), a second steering roller (72), and a base (73). The base (73) is disposed on the first storage module (1) and / or the second storage module (2). The arrangement directions of the first steering roller (71) and the second steering roller (72) are perpendicular. The mass unit (5) can be conveyed along the first direction on the first steering roller (71). When steering, the first steering roller (71) stops and the second steering roller (72) starts, so that the mass unit (5) is conveyed along the second direction. Alternatively, the steering unit (7) includes a first steering roller (71), a base (73), and a steering seat (74). The base (73) is disposed on the first storage module (1) and / or the second storage module (2). The steering seat (74) is rotatably disposed on the base (73). A plurality of first steering rollers (71) are distributed in parallel on the steering seat (74). The mass unit (5) is conveyed through the first steering rollers (71). When turning, rotating the steering seat (74) can turn the first steering rollers (71) to achieve the turning of the conveying direction of the mass unit (5).

11. The gravity energy storage system according to any one of claims 1-10, characterized in that, The lifting module (3) includes a first track (31), a first lifting machine (32) and a first traction cable (33). The first lifting machine (32) is slidably disposed on the first track (31), and the first traction cable (33) is suspended at the output end of the first lifting machine (32).

12. The gravity energy storage system according to any one of claims 1-4, 9, and 10, characterized in that, The lifting module (3) includes a first transport box (34), a first hoist (32) and a first traction cable (33). The first transport box (34) is used to receive the mass unit (5) of the first storage module (1). The first hoist (32) can lift the first transport box (34) from the first storage module (1) to the second storage module (2) by the first traction cable (33).

13. The gravity energy storage system according to claim 12, characterized in that, The first transport box (34) is also used to push the mass unit (5) onto the second storage module (2).

14. The gravity energy storage system according to any one of claims 1-10, characterized in that, The power generation module (4) includes a second track (41), a second hoist (42), and a second traction cable (43). The second hoist (42) is slidably mounted on the second track (41), and the second traction cable (43) is suspended at the output end of the second hoist (42).

15. The gravity energy storage system according to any one of claims 1-4, 9, and 10, characterized in that, The power generation module (4) includes a second transport box (44), a second hoist (42), and a second traction cable (43). The second transport box (44) is used to receive the mass unit (5) of the second storage module (2). The second hoist (42) can lower the second transport box (44) from the second storage module (2) to the first storage module (1) via the second traction cable (43).

16. The gravity energy storage system according to claim 15, characterized in that, The second transport box (44) is also used to push the mass unit (5) onto the first storage module (1).

17. The gravity energy storage system according to any one of claims 1-10, characterized in that, The lifting module (3) and the power generation module (4) are an integrated module; The integrated module includes a track, a hoist and a traction cable. The hoist is slidably mounted on the track and can lift or lower the mass unit (5) via the traction cable. Alternatively, the integrated module includes a transport box, a hoist, and a traction cable, wherein the hoist is capable of lifting or lowering the transport box via the traction cable, and the transport box is used to accommodate the mass unit (5).

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