Water buoyancy type energy storage system and energy storage method

Abstract

The present application relates to the technical field of energy storage, in particular to a water buoyancy type energy storage system and an energy storage system, the energy storage system comprises a cavity, the cavity contains groundwater, a moving weight is arranged in the cavity, the moving weight is connected with a traction rope, a supporting device is arranged on the cavity, a steering device is arranged on the supporting device, the traction rope passes through the steering device and is connected with a winding drum, the winding drum is connected with a connecting brake, the connecting brake is connected with a mechanical energy transmission device, the mechanical energy transmission device is connected with a drive power generation all-in-one machine; by arranging the cavity, the bead type weight, the steering device, the mechanical energy transmission device and the drive power generation all-in-one machine, the device can convert the external power supplied by the power supply device into mechanical energy first and then into the gravitational potential energy of the bead type weight for storage, the material used in the system has low cost, is environmentally friendly and recyclable, the service life of the whole energy storage system is long, the requirement for geographical environment is low, and the system can be applied to different regions.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a water buoyancy energy storage system and energy storage method. Background Technology

[0002] In recent years, temperatures on most land areas of the world have been higher than normal. Taking 2022 as an example, temperatures in northern Asia, Central Asia, eastern West Asia, northern and western Europe, and most of Greenland were more than 1°C higher than normal, while temperatures in parts of central North America were 1°C-2°C lower than normal. The global annual average land temperature was 1.67°C higher than the average for 1850-1900, the fourth highest since 1850. In 2022, the global monthly average temperature anomaly was higher than normal in all months except December, which was 0.24°C lower. The anomaly in October was 0.86°C. The causes of global warming include rapid population growth, air pollution, land degradation, toxic waste pollution, and water pollution.

[0003] Rapid population growth is one of the main factors contributing to global warming. The burning of fossil fuels, such as oil and coal, and deforestation produce large amounts of carbon dioxide, leading to an increase in global temperature—the greenhouse effect. As the greenhouse effect accumulates, it creates an imbalance between the energy absorbed and emitted by the Earth's atmosphere, causing energy to accumulate and resulting in rising temperatures and global warming. To address global warming, 178 parties worldwide signed the Paris Agreement, a unified set of actions for addressing climate change after 2020. The long-term goal of the Paris Agreement is to limit the increase in global average temperature to well below 2 degrees Celsius above pre-industrial levels, and to endeavor to limit the temperature increase to 1.5 degrees Celsius above pre-industrial levels.

[0004] Therefore, it is imperative to vigorously develop green energy sources such as solar and wind power. However, solar and wind power require the support of energy storage equipment to meet society's electricity needs.

[0005] Currently, the most widely used chemical energy storage is lithium batteries. Lithium is a rare element in nature, so it is expensive. Lithium batteries are easily damaged and pose safety hazards. In the future, there will be high environmental protection requirements for recycling. Pumped hydro storage is expensive and is restricted by geographical environment. It cannot be built in places without terrain differences and sufficient water sources.

[0006] Therefore, this invention proposes a water buoyancy gravity energy storage technology. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of high cost, high requirements for environmental protection and recycling, high geographical conditions, and short service life in the existing technology.

[0008] The present invention provides a water buoyancy energy storage system, the energy storage system including a cavity containing groundwater, a movable weight placed inside the cavity and connected to a traction rope, a support device on the cavity, a steering device on the support device, the traction rope passing through the steering device and connected to a drum, the drum being connected to a connecting gate, the connecting gate being connected to a mechanical energy transmission device, and the mechanical energy transmission device being connected to a drive-generator integrated unit.

[0009] As a preferred technical solution, the cavity includes a waterless area and a water-containing area. The waterless area includes a hovering area for parking moving heavy objects and an acceleration area for accelerating moving heavy objects. The water-containing area includes a deceleration area. Below the deceleration area is a braking area. Below the braking area is a temporary storage area for temporarily storing moving heavy objects.

[0010] As a preferred technical solution, the moving weight includes two or more bead-shaped weights, each bead-shaped weight having an inner layer and an outer layer. The inner layer is filled with a composite material. A steel support is fixed to each bead-shaped weight, and the steel support includes a base support. The base support is connected to a central steel cylinder via a support plate. The central steel cylinder passes through the center of the bead-shaped weight. A first winding area and a second winding area are provided opposite to each other on the steel support. The winding areas are located between adjacent support plates and have winding points. Each traction rope passes through only the central steel cylinder and winding point of one bead-shaped weight, and the bead-shaped weight moves up and down within the cavity.

[0011] As a preferred technical solution, the outer layer of the bead-type weight is made of ribbed adhesive, and the inner layer is composed of polished silicate concrete particles.

[0012] As a preferred technical solution, the steering device includes a first connecting shaft, the top of which is fixed to a support device. The first connecting shaft is rotatably connected to a second connecting shaft. The second connecting shaft is provided with a universal wheel, which is rotatably connected to the universal wheel via a rotating shaft. The universal wheel can both rotate with the second rotating shaft and rotate on its own. The universal wheel is provided with a traction rope.

[0013] As a preferred technical solution, the support device includes a concrete foundation, on which support columns are provided, and on which a support frame is provided between the two support columns. A reinforcing plate is provided between the support columns and the support frame, and the two support frames are connected by reinforcing ribs. A caster wheel is fixed to the bottom of the support frame, and a compass is provided on the reinforcing rib.

[0014] As a preferred technical solution, the connecting gate includes a first mortise arm and a second mortise arm, the mortise arm is provided with a mortise frame, the connecting gate also includes a tenon arm, the tenon arm is provided with a rigid tenon, and the rigid tenon protrudes outward.

[0015] As a preferred technical solution, the mechanical energy transmission device includes a first gear, which is disposed in a gear chain and is fixedly connected to a tenon arm. The gear chain also includes a second gear, and the gear chain is connected to the first gear and the second gear.

[0016] As a preferred technical solution, the drum is connected to the first drive shaft, the first drive shaft is equipped with a braking device, the first drive shaft is also connected to the connecting brake, and the second gear is connected to the integrated drive generator through the second drive shaft.

[0017] As a preferred technical solution, the traction rope passes through the cable bundle and is connected to the moving weight. The cable bundle includes an outer wall and a fixed post in the center. The outer wall is connected to the fixed post through partitions. There are six partitions evenly distributed around the fixed post, and the partitions divide the cable bundle into six identical spaces.

[0018] As a preferred technical solution, the device includes six traction ropes, six steering devices, six drums, six braking devices, six first drive shafts, and six connecting brakes. Only one traction rope is wound around the winding point of a beaded weight. The traction rope then passes through a space in the cable tray and through only one universal wheel, winding onto a drum. There is only one traction rope on the universal wheel and the drum. The drum is connected to a connecting brake via a first drive shaft. A beaded weight, a traction rope, a steering device, a drum, a braking device, a first drive shaft, and a connecting brake constitute a set of energy storage transmission devices. There are a total of six sets of energy storage transmission devices in this device. The six sets of energy storage transmission devices are respectively connected to the first gear via tenon arms.

[0019] As a preferred technical solution, the integrated generator is connected to a power supply device, which supplies the integrated generator with electrical energy generated by the power grid or other power generation devices. The integrated generator is also connected to a power quality rectifier, which is connected to a transformer, which is connected to the power grid. The power quality rectifier is an inverter.

[0020] As a preferred technical solution, the moving weight is a six-bead weight, which is arranged from top to bottom as the first bead weight, the second bead weight, the third bead weight, the fourth bead weight, the fifth bead weight, and the sixth bead weight.

[0021] During energy storage, the uppermost group of energy storage transmission devices, containing the beaded weights, first enters the rising state, closing the connecting gate and opening the braking device in this group. At this time, the connecting gates and braking devices in the other groups of energy storage transmission devices are open and in a braking state. Subsequently, the system uses the power supply device to transmit current to the integrated generator, which drives the mechanical energy transmission device to rotate, thereby driving the connecting gate to rotate. The connecting gate drives the drum to rotate through the first transmission shaft, and the drum lifts the beaded weights to the hovering area. After the beaded weights are lifted, the power supply device stops supplying power, and the integrated generator and mechanical energy transmission device stop rotating. The braking devices in this group of energy storage transmission devices are in a braking state, and the corresponding connecting gates are open. Then, the beaded weights in the other groups of energy storage transmission devices are lifted sequentially, using the same lifting method as the beaded weights, until all beaded weights are lifted to the hovering area. When all beaded weights have been lifted, all braking devices are in a braking state, and all connecting gates are in an open state, at which point energy storage is complete.

[0022] During energy release, the group of energy storage transmission devices at the bottom of the beaded weights enters the descent state. At this time, the braking device in this group of energy storage transmission devices is in the open state, and the connecting gate is in the closed state. The connecting gates in the other groups of energy storage transmission devices are in the open state, and the braking devices are in the braking state. The beaded weights descend, and the beaded weights drive the drum to rotate through the traction rope. The drum drives the mechanical energy transmission device to rotate through the first transmission shaft and the connecting gate. The rotation of the mechanical energy transmission device drives the integrated generator to generate electricity, and the current is transmitted through the transmission line to the power quality rectifier for rectification, and then transmitted to the transformer. After the voltage is changed in the transformer, it is transmitted to the power grid. After the beaded weights have finished releasing energy, the braking device in this group of energy storage transmission devices is in the braking state, and the connecting gate is open. Then, the beaded weights in the other groups of energy storage transmission devices are lowered in sequence, and the descent method is the same as that of the beaded weights, until all the beaded weights have been lowered to the temporary storage area. After all the beaded weights have been lowered, all the braking devices are in the braking state, and all the connecting gates are in the open state. At this time, the energy release is completed.

[0023] The beneficial effects of the present invention are as follows: The water buoyancy energy storage system and energy storage method provided by the present invention, by setting up a cavity, a bead-like weight, a steering device, a mechanical energy transmission device and a drive-generator integrated machine, enables the device to first convert the external electrical energy supplied by the power supply device into mechanical energy and then into the gravitational potential energy of the bead-like weight for storage. The materials used in this system are low cost, environmentally friendly and recyclable, the entire energy storage system has a long service life, low requirements for geographical environment, and can be applied to different regions.

[0024] By setting up a water-filled space within the cavity with the water surface below the freezing zone, this device can use the resistance of water to help brake moving heavy objects, improving braking efficiency and being environmentally friendly and pollution-free.

[0025] By setting the moving weights to six identical bead-type weights, the integrated drive and generator can handle the rise or fall of only one bead-type weight at a time, effectively avoiding damage to the integrated drive and generator due to excessive mass of the moving weights.

[0026] By setting up a mortise and tenon structure connecting gate that can control the opening or closing, the various energy storage transmission devices in this device do not interfere with each other and can operate independently.

[0027] By setting up multiple first gears and one second gear and gear chain, this device only needs to set up one integrated drive generator to drive multiple ball-shaped weights to rise sequentially for energy storage, and can also generate electricity by having multiple ball-shaped weights descend sequentially. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall energy storage system according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a top view of the energy storage system according to Embodiment 1 of the present invention;

[0030] Figure 3 This is a side view of the energy storage system according to Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the well and the moving weight in Embodiment 1 of the present invention.

[0032] Figure 5 This is a schematic diagram of a bead-type weight according to Embodiment 1 of the present invention;

[0033] Figure 6 This is a bottom view of the bead-type weight according to Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the moving weight and traction rope in Embodiment 1 of the present invention;

[0035] Figure 8 This is an overall schematic diagram of the steering device and support device according to Embodiment 1 of the present invention;

[0036] Figure 9 This is a side view of the steering device and support device according to Embodiment 1 of the present invention;

[0037] Figure 10 This is a schematic diagram of the connecting gate and mechanical energy transmission device according to Embodiment 1 of the present invention;

[0038] Figure 11This is a schematic diagram of the cable bundle according to Embodiment 1 of the present invention.

[0039] Among them, 1-hole, 101-waterless area, 102-watered area, 103-hovering area, 104-acceleration area, 105-deceleration area, 106-braking area, 107-temporary storage area, 2-moving heavy object, 201-first bead-type heavy object, 202-second bead-type heavy object, 203-third bead-type heavy object, 204-fourth bead-type heavy object, 205-fifth bead-type heavy object, 206-sixth bead-type heavy object, 2001-steel support, 2002-base support, 2003-central rigid cylinder, 2004-support plate, 2005-first winding area, 2006-second winding area, 2007-winding point, 3-traction rope, 4-steering device, 401-first connecting shaft, 402-second connecting shaft, 403-universal wheel, 5-Support device, 501-Concrete foundation, 502-Support column, 503-Support frame, 504-Reinforcing plate, 505-Reinforcing rib, 6-Drum, 7-Brake device, 8-First drive shaft, 9-Connecting gate, 901-First mortise arm, 902-Second mortise arm, 903-Mortise frame, 904-Tenon arm, 905-Tenon, 10-Mechanical energy transmission device, 1001-First gear, 1002-Gear chain, 1003-Second gear, 11-Drive generator, 12-Power quality rectifier, 13-Transformer, 14-Power grid, 15-Power supply device, 16-Wire bundle, 1601-Outer cylinder wall, 1602-Fixed column, 1603-Partition, 17-Compass, 18-Second drive shaft. Detailed Implementation

[0040] To make the technical means, features, objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific illustrations. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort should fall within the scope of protection of this invention.

[0041] Example 1:

[0042] As attached Figure 1 To be continued Figure 4As shown, a water-buoyancy energy storage system includes a cavity 1 containing groundwater. A moving weight 2 is placed inside the cavity 1 and connected to a traction rope 3. A support device 5 is mounted on the cavity 1, and a steering device 4 is mounted on the support device 5. The traction rope 3 passes through the steering device 4 and is connected to a drum 6. The drum 6 is connected to a first drive shaft 8, which is equipped with a braking device 7. The first drive shaft 8 is also connected to a connecting gate 9, which is connected to a mechanical energy transmission device 10. The mechanical energy transmission device 10 is connected to a generator 11 via a second drive shaft 18. The generator 11 is connected to a power supply device 15. The generator 11 is also connected to a power quality rectifier 12, which is connected to a transformer 13. The transformer 13 is connected to a power grid 14. The power quality rectifier 12 is an inverter.

[0043] The groundwater in the cavity 1 is below the local natural freezing zone, so it will not freeze even when the temperature is low, thus avoiding affecting the normal operation of the device. When the braking device 7 is in the braking state, it can prevent the corresponding first drive shaft 8 from rotating, thereby preventing the corresponding ball-type heavy objects from moving. The power supply device 15 is used to supply the power generated by the power grid or other power generation devices (solar energy, wind energy, hydropower, etc.) to the integrated generator 6. The power quality rectifier 12 is used to convert DC power into AC power with fixed frequency and voltage or frequency and voltage regulation. The transformer 13 is used to adjust the voltage.

[0044] As attached Figure 4 To be continued Figure 7 As shown, the cavity 1 includes a waterless area 101 and a water-containing area 102. The waterless area 101 includes a hovering area 103 for parking the moving heavy object 2 and an acceleration area 104 for accelerating the moving heavy object 2. The water-containing area 102 includes a deceleration area 105. Below the deceleration area 105 is a braking area 106. Below the braking area 106 is a temporary storage area 107 for temporarily storing the moving heavy object 2.

[0045] The moving weight 2 consists of two or more bead-shaped weights, each bead-shaped weight having an inner layer and an outer layer. The inner layer is filled with a composite material. A steel support 2001 is fixed on the bead-shaped weight. The steel support 2001 includes a base support 2002, which is connected to a central steel cylinder 2003 via a support plate 2004. The central steel cylinder 2003 passes through the center of the bead-shaped weight. A winding area is provided between adjacent support plates 2004. The winding area includes a first winding area 2005 and a second winding area 2006 arranged opposite to each other. A winding point 2007 is provided on the winding area. Each traction rope 3 passes through only the central steel cylinder 2003 and the winding point 2007 of one bead-shaped weight. The bead-shaped weight moves up and down within the cavity 1. The outer layer of the bead-shaped weight is made of rubber-coated tendon, and the inner layer is composed of polished silicate concrete particles.

[0046] The adhesive coating has a certain degree of flexibility and deformation capacity, and is wear-resistant. When the bead-shaped weight collides with the inner wall of the cavity 1, it can deform, reducing collision damage. The silicate concrete particles have a high specific gravity, are insoluble in water, are environmentally friendly and pollution-free, have stable chemical properties, and a long service life. After grinding, they have no sharp edges, which can reduce wear.

[0047] The moving weight 2 consists of six bead-type weights, arranged from top to bottom as follows: first bead-type weight 201, second bead-type weight 202, third bead-type weight 203, fourth bead-type weight 204, fifth bead-type weight 205, and sixth bead-type weight 206. Six traction ropes 3 pass through the central steel cylinder 2003 of the first bead-type weight 201, with one rope wrapped around the winding point 2007 of the first bead-type weight 201. Five ropes 3 pass through the central steel cylinder 2003 of the second bead-type weight 202. The traction rope 3 passes through, and one of them is wrapped around the winding point 2007 of the second bead-type weight 202. The traction ropes 3 passing through the other bead-type weight central steel cylinders 2003 decrease in number from high to low. Only one traction rope 3 passes through and is wrapped around the winding point 2007 of the lowest bead-type weight. Each traction rope 3 is wrapped around only one bead-type weight winding point 2007, and only one traction rope 3 is wrapped around each bead-type weight winding point 2007.

[0048] When the moving weight 2 descends, it accelerates in the acceleration zone 104, enters the deceleration zone 105 after contacting the water surface, decelerates in this zone, and enters the braking zone 106 where the braking device 7 applies the brakes, finally stopping in the temporary storage zone 107. During descent, the sixth bead-type weight 206 descends first. After the sixth bead-type weight 206 descends and stops in the temporary storage zone 107, the fifth bead-type weight 205 begins to descend. After the fifth bead-type weight 205 descends and stops in the temporary storage zone 107, the other bead-type weights descend in sequence in this manner. After all the bead-type weights have descended, the energy release process is completed.

[0049] When the moving weight 2 rises, the first bead-type weight 201 rises first, the sixth bead-type weight 201 rises and stops in the hovering area 103, the fifth bead-type weight 205 begins to rise, the fifth bead-type weight 202 rises and stops in the hovering area 103, and the other bead-type weights rise in sequence in this manner. After all the bead-type weights have risen, the energy storage process is completed.

[0050] As attached Figure 1 To be continued Figure 3 and attached Figure 8 Appendix Figure 9 As shown, the steering device 4 includes a first connecting shaft 401, the top of which is fixed to the support device 5. The first connecting shaft 401 is rotatably connected to a second connecting shaft 402. The second connecting shaft 402 is provided with a universal wheel 403. The second connecting shaft 402 is rotatably connected to the universal wheel 403 through a rotating shaft. The universal wheel 403 can rotate with the second rotating shaft 402 and also rotate on its own. The universal wheel 403 is provided with a traction rope 3.

[0051] The support device 5 includes a concrete foundation 501, on which support columns 502 are provided. A support frame 503 is provided on two support columns 502. A reinforcing plate 504 is provided between the support columns 502 and the support frame 503. The two support frames 503 are connected by reinforcing ribs 505. A caster wheel 403 is fixed at the bottom of the support frame 503. A compass 17 is provided on the reinforcing rib 503.

[0052] As attached Figure 10 As shown, the connecting gate 9 includes a first mortise arm 901 and a second mortise arm 902. The mortise arm is provided with a mortise frame 903. The connecting gate 9 also includes a tenon arm 904. The tenon arm 904 is provided with a rigid tenon 905, which protrudes outward.

[0053] In the working state, the first mortise arm 901 and the second mortise arm 902 are closely attached to the tenon arm 904. At this time, the mortise frame 903 is mortised and tenoned with the tenon 905. The mechanical energy transmission device 10 can drive the first transmission shaft 8 to rotate through the connecting gate 9.

[0054] When not in operation, the first mortise arm 901 and the second mortise arm 902 are away from the tenon arm 904. At this time, the mortise frame 903 and the tenon 905 are not in contact, and the mechanical energy transmission device 10 cannot drive the first transmission shaft 8 to rotate through the connecting gate 9.

[0055] The mechanical energy transmission device 10 includes a first gear 1001, which is disposed in a gear chain 1002 and is fixedly connected to a tenon arm 904. The gear chain 1002 also includes a second gear 1003, which is geared to the first gear 1001 and the second gear 1003. The second gear 1003 is connected to the integrated drive and generator 11 via a second transmission shaft 18.

[0056] During energy storage, the integrated drive and generator 11 can drive the second gear 1003 to rotate through the second drive shaft 18. The second gear 1003 drives the first gear 1001 to rotate through the gear chain 1002. The first gear 1001 can drive the connecting gate 9 to rotate through the connected tenon arm 904.

[0057] When releasing energy, the connecting gate 9 can drive the connected first gear 1001 to rotate through the tenon arm 904. The first gear 1001 drives the second gear 1003 to rotate through the gear chain 1002. The second gear 1003 can drive the integrated generator 11 to rotate through the second transmission shaft 18.

[0058] As attached Figure 1 To be continued Figure 3 and attached Figure 11 As shown, the traction rope 3 passes through the cable bundle 16 and is connected to the moving weight 2. The cable bundle 16 includes an outer cylindrical wall 1601 and a fixed post 1602 in the center of the cable bundle 16. The outer cylindrical wall 1601 is connected to the fixed post 1602 through a partition 1603. There are six partitions 1603, which are evenly distributed around the fixed post 1602. The partitions 1603 divide the cable bundle 16 into six identical spaces.

[0059] As attached Figure 1 To be continued Figure 11As shown, in this device, there are two or more identical beaded weights, traction ropes 3, steering devices 4, drums 6, braking devices 7, first drive shafts 8, connecting brakes 9, and first gears 1001, and their parameters are the same. Only one traction rope 3 is wound around the winding point 2007 of one beaded weight. Then, the traction rope 3 passes through a space in the cable tray 16 and only through one universal wheel 403, and is wound around one drum 6. There is only one traction rope 3 on the universal wheel 403 and the drum 6. 6 is connected to a connecting gate 9 via a first drive shaft 8. A beaded weight, traction rope 3, steering device 4, drum 6, braking device 7, first drive shaft 8, and connecting gate 9 constitute a set of energy storage transmission devices. There are two or more sets of energy storage transmission devices in this device. Each set of energy storage transmission devices is connected to the first gear 1001 via a tenon arm 904. This device only needs to be equipped with a drive-generator integrated machine 11 to drive multiple beaded weights to rise sequentially for energy storage, and can also generate electricity by having multiple beaded weights descend sequentially.

[0060] The rollers 6 are divided into two groups and symmetrically arranged on both sides of the hole 1. The axial section spacing and the radial section spacing are the same in each group of rollers 6.

[0061] As attached Figure 1 To be continued Figure 11 As shown, in one energy storage method using this energy storage system, during energy storage, the uppermost group of energy storage transmission devices for the beaded weight first enters the rising state, closing the connecting gate 9 and opening the braking device 7 in this group. At this time, the connecting gates 9 in other groups of energy storage transmission devices are in the open state, and the braking devices 7 are in the braking state. Subsequently, this system uses the power supply device 15 to transmit the current from the power supply device 15 to the integrated drive generator 11. The integrated drive generator 11 drives the mechanical energy transmission device 10 to rotate, thereby driving the connecting gate 9 to rotate. The connecting gate 9 drives the drum 6 to rotate through the first drive shaft 8, and the drum 6 drives the beaded weight to rise. After the beaded object is lifted to the hovering zone 103, the power supply device 15 stops supplying power, the integrated generator 11 and the mechanical energy transmission device 10 stop rotating, the braking device 7 in this group of energy storage transmission devices is in a braking state, and the corresponding connecting gate 9 is opened; then the beaded objects in other groups of energy storage transmission devices are lifted in sequence, and the lifting method is the same as that of the uppermost beaded object, until all beaded objects are lifted to the hovering zone 103. When all beaded objects have been lifted, all braking devices 7 are in a braking state, and all connecting gates 9 are in an open state. At this time, energy storage is completed.

[0062] During energy release and power generation, the group of energy storage transmission devices at the bottom of the bead-shaped weight enters the descent state. At this time, the braking device 7 in this group of energy storage transmission devices is in the open state, and the connecting gate 9 is in the closed state. The connecting gate 9 in other groups of energy storage transmission devices is in the open state, and the braking device 7 is in the braking state. The bead-shaped weight descends, and the bead-shaped weight drives the drum 6 to rotate through the traction rope 3. The drum 6 drives the mechanical energy transmission device 10 to rotate through the first transmission shaft 8 and the connecting gate 9. The rotation of the mechanical energy transmission device 10 drives the integrated generator 11 to generate electricity, and transmits the current through the transmission wire to... The power is rectified in the power quality rectifier 12 and then transmitted to the transformer 13. After the voltage is changed in the transformer 13, it is transmitted to the power grid 14. After the bead-shaped weight has finished releasing energy, the braking device 7 in the energy storage transmission device is in the braking state, and the connecting gate 9 is opened. Then, the bead-shaped weights in other energy storage transmission devices are lowered in sequence, and the lowering method is the same as that of the lowest bead-shaped weight, until all bead-shaped weights are lowered to the temporary storage area 107. After all the weights have been lowered, all the braking devices 7 are in the braking state, and all the connecting gates 9 are in the open state. At this time, the energy release is completed.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. A water-buoyancy energy storage system, characterized in that: The energy storage system includes a cavity (1) containing groundwater, a movable weight (2) inside the cavity (1) connected to a traction rope (3), a support device (5) on the cavity (1), a steering device (4) on the support device (5), the traction rope (3) passing through the steering device (4) and connected to a drum (6), the drum (6) connected to a connecting gate (9), the connecting gate (9) connected to a mechanical energy transmission device (10), and the mechanical energy transmission device (10) connected to a drive-generator integrated machine (11). The cavity (1) includes a waterless area (101) and a water-containing area (102). The waterless area (101) includes a hovering area (103) for parking the moving heavy object (2) and an acceleration area (104) for accelerating the moving heavy object (2). The water-containing area (102) includes a deceleration area (105). A braking area (106) is provided below the deceleration area (105). A temporary storage area (107) is provided below the braking area (106) for temporarily storing the moving heavy object (2). The moving weight (2) consists of two or more bead-type weights. The bead-type weights include an inner layer and an outer layer. The inner layer is filled with a composite material. A steel support (2001) is fixed on the bead-type weight. The steel support (2001) includes a base support (2002). The base support (2002) is connected to a central steel cylinder (2003) through a support plate (2004). The central steel cylinder (2003) passes through the center of the bead-type weight. The steel support (2001) is provided with a winding area. The winding area includes a first winding area (2005) and a second winding area (2006) arranged opposite to each other. The winding area is located between adjacent support plates (2004). The winding area is provided with a winding point (2007). Each traction rope (3) passes through only the central steel cylinder (2003) and the winding point (2007) in one bead-type weight. The bead-type weight moves up and down in the hole (1). The connecting gate (9) includes a first mortise arm (901) and a second mortise arm (902). The mortise arm is provided with a mortise frame (903). The connecting gate (9) also includes a tenon arm (904). The tenon arm (904) is provided with a rigid tenon (905). The rigid tenon (905) protrudes outward. The mechanical energy transmission device (10) includes a first gear (1001), which is disposed in a gear chain (1002). The first gear (1001) is fixedly connected to a tenon arm (904). The gear chain (1002) is also provided with a second gear (1003), and the gear chain (1002) is geared to the first gear (1001) and the second gear (1003).

2. The buoyancy-based energy storage system according to claim 1, characterized in that: The outer layer of the bead-shaped weight is made of ribbed adhesive, and the inner layer is composed of polished silicate concrete particles.

3. The buoyancy-based energy storage system according to claim 1, characterized in that: The steering device (4) includes a first connecting shaft (401), the top of which is fixed on the support device (5). The first connecting shaft (401) is rotatably connected to a second connecting shaft (402). A universal wheel (403) is provided on the second connecting shaft (402). The second connecting shaft (402) is rotatably connected to the universal wheel (403) through a rotating shaft. The traction rope (3) passes through the universal wheel (403) and is connected to the drum (6).

4. The buoyancy-based energy storage system according to claim 1, characterized in that: The support device (5) includes a concrete foundation (501), a support column (502) on the concrete foundation (501), a support frame (503) on the support column (502), a reinforcing plate (504) between the support column (502) and the support frame (503), two support frames (503) are connected by reinforcing ribs (505), a caster wheel (403) is fixed at the bottom of the support frame (503), and a compass (17) is provided on the reinforcing rib (505).

5. The buoyancy-based energy storage system according to claim 1, characterized in that: The drum (6) is connected to the first drive shaft (8), which is equipped with a braking device (7). The first drive shaft (8) is also connected to the connecting gate (9). The second gear (1003) is connected to the integrated generator (11) via the second drive shaft (18).

6. The buoyancy-based energy storage system according to claim 1, characterized in that: The traction rope (3) passes through the cable bundle (16) and is connected to the moving weight (2). The cable bundle (16) includes an outer cylinder wall (1601). A fixed post (1602) is provided in the center of the cable bundle (16). The outer cylinder wall (1601) is connected to the fixed post (1602) through a partition (1603). There are six partitions (1603) and they are evenly distributed around the fixed post (1602). The partitions (1603) divide the cable bundle (16) into six identical spaces.

7. A buoyancy-based energy storage system according to any one of claims 1-6, characterized in that: The traction rope (3), steering device (4), drum (6), braking device (7), first drive shaft (8), and connecting gate (9) are each provided in more than two. Only one traction rope (3) is wound around the winding point (2007) of a beaded weight. Then the traction rope (3) passes through a space in the cable tie drum (16) and only passes through a universal wheel (403) to be wound around a drum (6). There is only one traction rope (3) on the universal wheel (403) and the drum (6). A drum (6) is connected to a connecting gate (9) through a first drive shaft (8). A beaded weight, traction rope (3), steering device (4), drum (6), braking device (7), first drive shaft (8), and connecting gate (9) constitute a set of energy storage transmission devices. There are more than two sets of energy storage transmission devices in this device. The energy storage transmission devices are connected to the first gear (1001) through tenon arm (904). The mechanical energy transmission device (10) can be connected to two or more sets of energy storage transmission devices individually.

8. A buoyancy-based energy storage system according to claim 7, characterized in that: The integrated generator (11) is connected to a power supply device (15), which supplies the generator (11) with electrical energy generated by the power grid or other power generation devices. The integrated generator (11) is also connected to a power quality rectifier (12), which is connected to a transformer (13), which is connected to the power grid (14). The power quality rectifier (12) is an inverter.

9. A buoyancy-based energy storage system according to claim 8, characterized in that: The moving weight (2) includes six bead-type weights, which are arranged from top to bottom as the first bead-type weight (201), the second bead-type weight (202), the third bead-type weight (203), the fourth bead-type weight (204), the fifth bead-type weight (205), and the sixth bead-type weight (206).

10. An energy storage method utilizing the buoyancy energy storage system of claim 9, characterized in that: During energy storage, the first energy storage transmission device at the top of the beaded weight enters the lifting state, opening the braking device (7) in this group and closing the connecting gate (9). At this time, the connecting gates (9) in other energy storage transmission devices are in the open state, and the braking devices (7) are in the braking state. Subsequently, the system uses the power supply device (15) to transmit the current in the power supply device (15) to the integrated drive generator (11). The integrated drive generator (11) drives the mechanical energy transmission device (10) to rotate, thereby driving the connecting gate (9) to rotate. The connecting gate (9) drives the drum (6) to rotate through the first drive shaft (8). The drum (6) drives the beaded weight to rise and hover. After the beaded object is lifted in zone (103), the power supply device (15) stops supplying power, the integrated generator (11) and the mechanical energy transmission device (10) stop rotating, the braking device (7) in the energy storage transmission device is in a braking state, and the corresponding connecting gate (9) is opened; then the beaded objects in other energy storage transmission devices are lifted in sequence, and the lifting method is the same as the lifting method of the uppermost beaded object, until all beaded objects are lifted to the suspension zone (103). When all beaded objects are lifted, all braking devices (7) are in a braking state, and all connecting gates (9) are in an open state. At this time, energy storage is completed.

11. The energy storage method according to claim 10, characterized in that: During energy release, the group of energy storage transmission devices at the bottom of the beaded weight enters the descent state. At this time, the braking device (7) in this group of energy storage transmission devices is in the open state, and the connecting gate (9) is in the closed state. The connecting gate (9) in other groups of energy storage transmission devices is in the open state, and the braking device (7) is in the braking state. The beaded weight in this group descends. The beaded weight drives the drum (6) to rotate through the traction rope (3). The drum (6) drives the mechanical energy transmission device (10) to rotate through the first transmission shaft (8) and the connecting gate (9). The rotation of the mechanical energy transmission device (10) drives the integrated generator (11) to generate electricity and transmits the current through the transmission wire. The energy is rectified in the power quality rectifier (12) and then transmitted to the transformer (13). After the voltage is changed in the transformer (13), the energy is transmitted to the power grid (14). After the energy is released by the bead-type weight, the braking device (7) in the energy storage transmission device is in a braking state and the connecting gate (9) is opened. Then, the bead-type weights in other energy storage transmission devices are lowered in sequence. The lowering method is the same as that of the lowermost bead-type weight, until all the bead-type weights are lowered to the temporary storage area (107). After all the weights are lowered, all the braking devices (7) are in a braking state and all the connecting gates (9) are in an open state. At this time, the energy release is completed.

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