A wheel-driven track-type gravity flow energy storage system and energy storage method

Abstract

The present application relates to a wheel-driven track-type gravity flow energy storage system and an energy storage method, wherein the wheel-driven track-type gravity flow energy storage system includes a dual-circulation bearing mechanism, a dual-circulation traction mechanism and a dual-wheel drive mechanism; the dual-circulation bearing mechanism includes two bearing rails, the dual-circulation traction mechanism includes two traction ropes, and the dual-wheel drive mechanism includes two parallel and vertically installed drive wheels, the traction ropes are wrapped around the drive wheels and continuously run under the drive wheels; a plurality of carrying mechanisms are arranged between the bearing rails, and the traction ropes pull and drive the carrying mechanisms to run continuously, and the carrying mechanisms are used to carry energy storage blocks as energy storage carriers; the driving wheels are connected to electric generators; the electric generators are used to drive the driving wheels to actively rotate, forming a continuous gravity flow by continuously lifting the energy storage blocks; and the driving wheels are driven to rotate by continuously descending the energy storage blocks, so as to convert gravitational potential energy into electrical energy of the electric generators to form a continuous energy flow.

Description

Technical Field

[0001] The present application relates to the field of gravity energy storage, and more specifically, to a wheel-driven track-type gravity flow energy storage system and an energy storage method. Background Art

[0002] In recent years, my country's electricity demand has maintained a steady growth trend, and the proportion of new power generation technologies such as wind and photovoltaic power in energy utilization has gradually increased. However, renewable energy sources, mainly wind and photovoltaic power, are characterized by randomness, volatility, and intermittency, and cannot fully meet society's electricity demand. Therefore, energy storage systems are necessary to balance power generation and consumption.

[0003] Current energy storage methods include gravity, electrochemical, chemical, and thermal. However, these methods suffer from energy loss, making them unsuitable for long-term energy storage and generally present safety issues.

[0004] Pumped hydro and flywheel storage, both gravity-based energy storage systems, require high terrain and space requirements, making them difficult to deploy widely. Consequently, gravity-based energy storage, which generates power based on height differences, is gaining increasing attention.

[0005] The existing gravity energy storage system uses large loads to lift and lower successively, which has the following technical problems:

[0006] The intermittent load generated by raising and lowering the energy storage blocks one by one means discontinuous charging and discharging.

[0007] The problem of real-time load matching: During a single power generation process, the weight of the heavy object is fixed, so the power generation power is also fixed and cannot be dynamically adjusted according to actual load requirements. Summary of the Invention

[0008] The purpose of this application is to provide a wheel-driven track-type gravity flow energy storage system and energy storage method, which can solve the existing technical problems of the above-mentioned gravity energy storage system.

[0009] To achieve the above objectives, in a first aspect, the present invention provides a wheel-driven track-type gravity flow energy storage system, comprising a dual-circulation bearing mechanism, a dual-circulation traction mechanism, and a dual-wheel drive mechanism;

[0010] The dual-loop carrying mechanism comprises two parallel upward-inclined closed-loop carrying rails; the dual-loop traction mechanism comprises two parallel upward-inclined closed-loop traction ropes; the dual-wheel drive mechanism comprises two parallel vertically mounted drive wheels; at least a portion of the traction rope is looped around the drive wheels and is driven by the drive wheels to continuously run;

[0011] A plurality of carrying mechanisms that can run along the closed loop are provided between the carrying rails, and the traction ropes are connected to the carrying mechanisms so as to enable the traction ropes to pull and drive the carrying mechanisms to run continuously, and the carrying mechanisms are used to carry energy storage blocks as energy storage carriers;

[0012] The driving wheel is connected to an electric power generation mechanism;

[0013] The electric generator mechanism is used to drive the driving wheel to actively rotate, forming a continuous gravity flow through the continuously lifted energy storage block;

[0014] Furthermore, the driving wheel is driven to rotate by the continuously descending energy storage block, so as to convert the gravitational potential energy into the electric energy of the electric generator mechanism to form a continuous energy flow.

[0015] In an optional embodiment, the dual-wheel drive mechanism includes a horizontally arranged transmission shaft, and the two driving wheels are vertically connected to the transmission shaft, or the two driving wheels are independently driven and arranged in mirror symmetry;

[0016] The two traction ropes are respectively wrapped around the corresponding driving wheels, so that the driving wheels drive the traction ropes to run through the friction force of the wrapping contact;

[0017] An end portion of the transmission shaft is connected to the electric generator mechanism, which includes a motor generator.

[0018] In an optional embodiment, the traction rope is arranged on the inner side or the outer side of the carrying track, and the carrying mechanism is connected between the two traction ropes;

[0019] The closed-loop plane of the load-bearing track, the closed-loop plane of the traction rope, and the wheel surface of the driving wheel are parallel to each other.

[0020] In an optional embodiment, the two carrying rails are mirror-symmetrical with respect to the traction rope, and each carrying rail includes an upper branch rail and a lower branch rail corresponding to each other;

[0021] The upward branch track and the downward branch track respectively include an inclined section, a horizontal guide section, an arc-shaped turning section and an end turning section that are arranged opposite to each other, and at least a portion of the branch track is cross-stacked at the end turning section.

[0022] In an optional embodiment, the two traction ropes each include a single closed-loop annular traction rope, a section of the annular traction rope passes around the drive wheel, and the different sections of the annular traction rope corresponding to the load-bearing track are on the same plane, forming a surrounding plane of the traction rope.

[0023] In an optional embodiment, the driving wheel includes two active driving wheels connected by a horizontal transmission shaft, or two active driving wheels driven separately, and the electric generator includes an output shaft, which is sequentially connected to the horizontal transmission shaft through a coupling.

[0024] In an optional embodiment, the two-wheel drive mechanism is arranged on the top of the energy storage system and is installed by a drive mounting mechanism. The drive mounting mechanism includes relatively mounted drive supports and an energy storage device mounting seat. The transmission shaft and the drive wheel are installed between the drive supports, and the electric generator is installed on the energy storage device mounting seat.

[0025] In an optional embodiment, a detour wheel group is provided at the bottom of the energy storage system, the detour wheel group includes two vertically mounted steering wheels arranged in parallel, the steering wheels have the same structure as the driving wheels, and the wheel surfaces of the steering wheels and the driving wheels are arranged on the same plane;

[0026] Each of the traction ropes is closed and looped between the driving wheels and the steering wheels that correspond to each other in a group. Wheel grooves are respectively provided on the wheel surfaces of the driving wheels and the steering wheels, and the traction ropes are compressed and looped in the wheel grooves.

[0027] In an optional embodiment, the transport mechanism includes transport frames located on both sides and arranged corresponding to the carrying rails, and a connecting crossbeam is connected between the transport frames;

[0028] Each of the transport frames is respectively equipped with rolling wheels, which roll along the load-bearing track, and the transport frame runs in a closed loop around the load-bearing track under the traction of the traction rope;

[0029] The connecting crossbeam is provided with hanging cantilevers at intervals, and the hanging cantilevers are used to hang the energy storage block, and the two ends of the connecting crossbeam are respectively connected to the carrier frame;

[0030] The hanging cantilever is rotatably connected to the connecting beam, or the connecting beam is rotatably connected to the carrying frame.

[0031] In an optional embodiment, the transport frame is connected to the traction rope via a rope connection mechanism located on the side, the rope connection mechanism is connected to the transport frame and fixedly connected to the traction rope, the transport frame includes a mounting plate for mounting the rope connection mechanism, and the rope connection mechanism is mounted on the mounting plate via a slewing bearing.

[0032] In an optional embodiment, the rope connecting mechanism includes a fixing device fixed on the traction rope.

[0033] In an optional embodiment, a rotary guide rail is provided at the location of the driving wheel and the steering wheel, the rotary guide rail includes a guide rail segment and a steering rail segment that are rotatably connected, and the guide rail segment and the steering rail segment respectively include a horizontal rail and a curved rail that are separated from the load-bearing rail;

[0034] The starting end of the guide rail section is arranged above the horizontal guide section and merges into one of the branch rails after the turning rail section rotates. The horizontal guide section of the other branch rail interrupts the track at the merging position of the rotating guide rail.

[0035] In an optional embodiment, a storage yard for storing the energy storage blocks is further included. The storage yard is arranged at the top and bottom of the energy storage system, and the energy storage blocks are transported back and forth between the storage yard and the carrying rails by transfer equipment.

[0036] In a second aspect, the present invention provides a wheel-driven track-type gravity flow energy storage method, which is performed by the wheel-driven track-type gravity flow energy storage system described in the above embodiment, including an energy storage stage and a discharge stage:

[0037] During the energy storage phase, the wheel-driven rail-type gravity flow energy storage system continuously transports the energy storage blocks located at the bottom of the energy storage system from bottom to top, and a continuous gravity flow is formed by the lifting of the energy storage blocks;

[0038] During the discharge phase, the energy storage blocks located at the top of the energy storage system are continuously transported downwards through the wheel-driven rail-type gravity flow energy storage system, and a continuous energy flow is formed by the descent of the energy storage blocks.

[0039] In an optional embodiment, the carrying mechanism is equidistantly connected to the traction rope;

[0040] The energy storage blocks may correspond to the transport mechanism, or may correspond to the transport mechanism at intervals. The travel speed of the transport mechanism following the traction rope is adjustable, thereby achieving adjustable gravity flow.

[0041] In an optional embodiment, the wheel-driven track-type gravity flow energy storage system includes multiple sets, and the multiple sets of the wheel-driven track-type gravity flow energy storage system are arranged in multiple rows in parallel and / or stacked up and down on the hillside terrain.

[0042] The wheel-driven track-type gravity flow energy storage system in this application can realize the distributed load-bearing of gravity energy storage blocks, avoid single-point overload, and improve the safety of system operation.

[0043] Through the mutual cooperation of the carrying track, the carrying mechanism and the traction rope, continuous and steady traction operation of multiple carrying mechanisms can be formed during the operation of the driving wheel. Combined with the carrying of the energy storage block by the carrying mechanism, stable and continuous gravity flow and energy flow can be obtained in the energy storage stage and the discharge stage. Under the premise of improving the carrying capacity, high-efficiency operation of the energy storage and power generation states is guaranteed, and high-power storage / discharge of electric energy can be realized.

[0044] By decoupling the load-bearing and traction formed by the load-bearing track and the traction rope, the system has a stronger load-bearing capacity and a more balanced load compared to the common gravity flow energy storage system, making the process of forming continuous gravity flow and energy flow more stable and reliable.

[0045] The parallel arrangement of vertically mounted drive wheels can reduce space occupation and facilitate the formation of drive traction surfaces corresponding to the two traction ropes, thereby ensuring a stable and reliable continuous circulation of the traction ropes.

[0046] By cooperating with each other, a three-in-one composite transmission system is constructed, which maximizes safety and stability compared to the traditional single-cable simultaneous load-bearing and traction.

[0047] At the same time, the energy storage blocks are transported, lifted and transmitted through the transport mechanism. Compared with the detachable installation of the energy storage blocks, this can simplify the transport structure, reduce the additional components that require frequent opening and closing of the energy storage blocks, ensure the reliability of the system installation, and reduce maintenance costs.

[0048] The wheel-driven track-type gravity flow energy storage method in the present invention can form a continuous steady-state gravity flow and energy flow. By adjusting the speed of the electric generator mechanism and the connection interval of the energy storage block, the real-time power consumption or power generation can be arbitrarily adjusted, thereby realizing the "slow charging and fast discharging" or "charging and discharging on demand" functions.

[0049] Combining multiple sets of wheel-driven rail-type gravity flow energy storage systems to achieve parallel multi-split and / or up-and-down stacking arrangements according to the hillside terrain can achieve larger-scale energy storage.

[0050] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] Figure 1This is a schematic diagram of the overall structure of the wheel-driven track-type gravity flow energy storage system in this application;

[0053] Figure 2 This is a schematic structural diagram of the dual-wheel drive mechanism in this application;

[0054] Figure 3 This is a schematic diagram of the structure of the carrier mechanism and energy storage block in this application;

[0055] Figure 4 This is a schematic diagram of the top structure of the bearing rail in this application;

[0056] Figure 5 This is a schematic structural diagram of the rope connection mechanism in this application.

[0057] icon:

[0058] 1-carrying track; 1a-inclined section; 1b-horizontal guide section; 1c-arc-turning section; 1d-end-turning section; 11-upward branch track; 12-downward branch track;

[0059] 2-traction rope;

[0060] 3-driving wheel; 3a-first active driving wheel; 3b-second active driving wheel; 31-transmission shaft; 32-steering wheel; 33-wheel groove;

[0061] 4-carrying mechanism; 41-carrying frame; 42-connecting beam; 43-rolling wheel; 44-hanging cantilever; 45-mounting plate;

[0062] 5-Energy storage block;

[0063] 6-Electric generating mechanism;

[0064] 7- driving support;

[0065] 8-rope connection mechanism; 81-slewing bearing;

[0066] 9-rotating guide rail; 91-guide rail section; 92-turn rail section;

[0067] 10-Supporting column; 10a-Supporting leg. DETAILED DESCRIPTION

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0069] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0070] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0071] The wheel-driven track-type gravity flow energy storage system and energy storage method in this application are mainly used in the field of gravity energy storage. By optimizing the structure and energy storage method of the existing gravity energy storage system, a continuous and stable gravity flow and energy flow are formed, while creating space for the scale adjustment of gravity flow and energy flow.

[0072] By decoupling load bearing and traction, the risk of single-point stress concentration can be avoided while ensuring the stability and reliability of continuous gravity flow and energy flow.

[0073] See also Figure 1 , and combined with Figure 2-Figure 5 The wheel-driven track-type gravity flow energy storage system and energy storage method of the present invention have a main structure including a double-circulation bearing mechanism, a double-circulation traction mechanism and a double-wheel drive mechanism;

[0074] The dual-loop carrying mechanism comprises two parallel upward-inclined closed-loop carrying rails 1; the dual-loop traction mechanism comprises two parallel upward-inclined closed-loop traction ropes 2; the dual-wheel drive mechanism comprises two parallel vertically mounted drive wheels 3; at least a portion of the traction ropes 2 is looped around the drive wheels 3 and is driven by the drive wheels 3 to continuously run;

[0075] A plurality of carrying mechanisms 4 are provided between the carrying rails 1 and can run along the closed loop thereof. The traction ropes 2 are connected to the carrying mechanisms 4 so as to enable the traction ropes 2 to pull and drive the carrying mechanisms 4 to run continuously. The carrying mechanisms 4 are used to carry energy storage blocks 5 as energy storage carriers.

[0076] The driving wheel 3 is connected to an electric generator mechanism 6;

[0077] The electric generator mechanism 6 is used to drive the driving wheel 3 to actively rotate, forming a continuous gravity flow through the continuously lifted energy storage block 5;

[0078] Furthermore, the driving wheel 3 is driven to rotate by the continuously descending energy storage block 5, so as to convert the gravitational potential energy into the electrical energy of the electric generator 6 to form a continuous energy flow.

[0079] By using two parallel upward-inclined closed-loop load-bearing tracks 1, a double-track structure for providing a load-bearing effect is formed, which can realize the distributed load-bearing of the gravity energy storage block 5. Compared with the single-track structure, the load intensity is reduced, the risk of single-point overload is avoided, and the safety margin of the system operation is improved.

[0080] At the same time, two parallel upward-inclined closed-loop traction ropes 2 can be driven by two parallel vertically installed driving wheels 3 to continuously and dynamically operate, forming an operating structure for providing a traction effect. Combined with the carrying mechanism 4 that can run along the load-bearing track 1, and connecting the carrying mechanism 4 with the traction rope 2, a continuous traction operation state of multiple carrying mechanisms 4 under the dual action of the load-bearing track 1 and the traction rope 2 can be formed.

[0081] On the one hand, it can realize multi-point distributed carrying of the carrying mechanism 4 on the carrying track 1 and synchronous traction under the action of the traction rope 2, and on the other hand, it can enable the energy storage block 5 to form a continuous carrying operation state.

[0082] By lifting and transporting the energy storage block 5 from a continuous traction operation, a steady-state continuous gravity flow can be formed in the energy storage stage, and a steady-state continuous energy flow can be formed by releasing and converting the gravity flow in the discharge stage.

[0083] The continuous traction operation state formed by multiple transport mechanisms 4 can increase the maximum carrying capacity of the system, ensure high-efficiency operation of energy storage and power generation states, and realize high-power storage / discharge of electric energy.

[0084] The mutual cooperation between the load-bearing track 1 and the traction rope 2 can form a separate setting form of load-bearing and traction. When the energy storage block 5 is transported, the load-bearing track 1 is used to bear the weight of the carrying mechanism 4 and the energy storage block 5, and the traction rope 2 is used to pull the carrying mechanism 4 and the energy storage block 5 to slide along the track.

[0085] Through the above-mentioned decoupling of the load-bearing and traction functions, the stress concentration problem of the traditional single-cable load-bearing and traction system can be solved, and the mutual interference between load-bearing and traction can be reduced in the form of independent structures cooperating with each other, ensuring the stability and reliability of the load-bearing and traction effects.

[0086] Two parallel and vertically installed drive wheels 3 can be used for the traction rope 2 to wrap around. At least a portion of the traction rope 2 is wrapped around the drive wheel 3. Combined with the friction between the traction rope 2 and the drive wheel 3, the drive wheel 3 drives the traction rope 2 to move stably and continuously during the rotation process, ensuring the reliable and stable continuous gravity flow and energy flow.

[0087] Compared with the traditional horizontal wheel form, the vertically installed drive wheel 3 can reduce the space occupied, break through the terrain slope limit, have simpler terrain requirements, and is convenient for installation on more slopes. It can be deployed in a variety of terrains and is particularly suitable for complex geological environments such as mountains and hills.

[0088] On this basis, it is possible to facilitate the formation of a driving traction surface that matches the traction rope 2, ensuring that the traction rope 2 moves continuously on the shaped surrounding surface.

[0089] The electric generator mechanism 6 connected to the driving wheel 3 can drive the driving wheel 3 to actively rotate, and form a continuous gravity flow through the continuously lifted energy storage block 5.

[0090] At the same time, the continuously descending energy storage block 5 can drive the driving wheel 3 to rotate passively, so that the lifted energy storage block 5 can convert the gravity energy stored in the form of potential energy into electrical energy that can be generated by the electric generator 6 during the descent process to form a continuous energy flow.

[0091] The dual-wheel drive mechanism in the present invention includes a horizontally arranged transmission shaft 31, and two driving wheels 3 are vertically connected to the transmission shaft 31 and are arranged at intervals relative to the axial direction of the transmission shaft 31. The interval space between the two driving wheels 3 constitutes the traction and movement space of the carrying mechanism 4 and the flipping and turning space at the position of the driving wheels 3.

[0092] In another specific implementation, the two driving wheels 3 can also be driven independently, and the two driving wheels are arranged in a mirror-symmetrical manner, which can also achieve the above-mentioned technical effect.

[0093] From the perspective of constructing the driving traction surface as mentioned above, the two traction ropes 2 are respectively wrapped around the corresponding driving wheels 3, so that the driving wheels 3 drive the traction ropes 2 to run through the friction between the traction ropes 2 and the driving wheels 3 in the surrounding contact.

[0094] The end of the transmission shaft 31 is connected to the electric generator mechanism 6, which specifically includes an electric generator. The electric generator has both driving and discharging functions. During the energy storage stage, it can drive the driving wheel 3 to actively rotate through the driving function, and at the same time, the energy storage block 5 located at the bottom of the energy storage system is lifted by the carrying mechanism 4 to form a continuous gravity flow.

[0095] And in the discharge stage, the energy storage block 5 located at the top of the energy storage system can be lowered and transported by the carrying mechanism 4, and the driving wheel 3 can be driven to rotate passively by the traction rope 2, thereby rotating the electric generator, so that the gravity flow is converted into an energy flow in the form of electrical energy through the discharge function.

[0096] The specific form of the electric generator mechanism 6 is not limited in this application. In addition to the electric generator connected to the above-mentioned transmission shaft 31, one of the drive wheels 3 can also be connected to the motor, and the other drive wheel 3 can be connected to the generator. By controlling the clutch of the drive wheel 3 and the motor or generator in different energy storage and discharge stages, the motor and generator can perform different functions on the premise that the two drive wheels 3 maintain transmission connection.

[0097] In order to enable the carrying mechanism 4 to maintain a cooperative relationship with the carrying rail 1 and the traction rope 2 at the same time, the traction rope 2 is arranged on the inner side of the carrying rail 1, and the carrying mechanism 4 is connected between the two traction ropes 2. At the same time, the two sides of the carrying mechanism 4 respectively pass over the traction rope 2 and run and are assembled on the carrying rail 1.

[0098] Based on the structural form of the closed-loop circulation of the bearing track 1, the closed loop of the traction rope 2 and the parallel arrangement of the driving wheel 3, the closed-loop plane of the bearing track 1, the closed-loop plane of the traction rope 2 and the wheel surface of the driving wheel 3 are parallel to each other, which can form the overlap of the traction surface driven by the traction rope 2 and the surface of the traction rope 2 wrapped around the driving wheel 3, and at the same time form a stable and reliable operating bearing surface and traction surface relative to the carrying mechanism 4, avoiding the risk of deviation of the carrying mechanism 4 to the greatest extent and ensuring operational stability.

[0099] From the perspective of the parallel arrangement of the carrying rails 1, the two carrying rails 1 are mirror-symmetrical with respect to the traction rope 2, and each carrying rail 1 includes an upper branch rail 11 and a lower branch rail 12 corresponding to each other;

[0100] The upward branch track 11 and the downward branch track 12 respectively include an oppositely arranged inclined section 1a, a horizontal guide section 1b, an arc-shaped turning section 1c and an end turning section 1d, and at least a portion of the branch track is cross-overlapped at the end turning section 1d.

[0101] With reference to the accompanying drawings, each of the supporting rails 1 on both sides is not an integral closed structure assembled by connecting the upward branch rail 11 and the downward branch rail 12, but rather constitutes a closed-loop circulation space of each supporting rail 1 by overlapping.

[0102] Specifically, after the top of the upward branch track 11 is guided by the horizontal guide section 1b and turned by the arc-shaped turning section 1c, it stops extending after maintaining a distance from the end turning section 1d, and cross-stacks with the horizontal guide section 1b at the top of the downward branch track 12, thereby forming a continuous connection after the turning of the carrying mechanism 4 in the gap of the cross-stacked part.

[0103] Through the above-mentioned duplex stacking relationship, a closed-circuit track is formed to ensure that the carrying mechanism 4 always runs on the carrying track 1, avoid the risk of derailment, and ensure stability and reliability.

[0104] The two traction ropes 2 respectively include a single closed-loop annular traction rope 2, a section of the annular traction rope 2 passes around the driving wheel 3, and the different sections corresponding to the annular traction rope 2 and the supporting rail 1 are on the same plane, forming a closed-loop plane of the traction rope 2.

[0105] From the perspective of the parallel setting of the traction rope 2, the two traction ropes 2 respectively include a single closed-loop annular traction rope 2, a section of the annular traction rope 2 is wrapped around the driving wheel 3, and the different sections corresponding to the annular traction rope 2 and the supporting rail 1 are on the same plane, forming a closed-loop plane of the traction rope 2.

[0106] Preferably, the annular traction ropes 2 are vertically arranged on the same plane, and combined with their encircling around the driving wheel 3 , a relatively stable driving traction surface parallel to the carrying rail 1 can be maintained.

[0107] Based on the matching angle between the driving wheel 3 and the two driving traction surfaces, the driving wheel 3 includes a first active driving wheel 3a and a second active driving wheel 3b, which are connected by a horizontal transmission shaft 31. The two driving wheels 3 rotate synchronously, and the intermediate transmission shaft 31 transmits the power.

[0108] Regarding the form of the electric generator described above, the electric generator includes an output shaft, which is connected to the intermediate transmission shaft 31 through a coupling to form a coaxial transmission relationship, ensuring the reliability of the drive wheel 3 during the energy storage process of driven rotation and the discharge process of passive rotation.

[0109] It should be noted that, in addition to connecting the output shaft of the electric generator to the intermediate transmission shaft 31, when the electric motor and generator are set separately, two separately driven active drive wheels can also be set at the same time, which can maintain the transmission relationship between the two drive wheels 3, so that the output shafts of the electric motor and the generator are respectively connected to the two active drive wheels, and the necessary clutch operations are combined to perform different switching between energy storage and power generation. It will not be repeated here.

[0110] The two-wheel drive mechanism is arranged at the top of the energy storage system, that is, the two-wheel drive mechanism is installed on a high-lying platform. Through this arrangement, the two-wheel drive mechanism can directly output and transfer the traction load to the carrying mechanism 4 and the energy storage block 5, thereby reducing the load of the energy storage system during the energy storage process and reducing the overall force load of the traction rope 2. Compared with the traditional form of setting the drive mechanism at the bottom, it can reduce the invalid load during bottom traction and improve the conversion rate during the energy storage process.

[0111] It should be pointed out that in addition to the most economical top-up drive form, the bottom-down drive form can also be adopted, or the top and bottom can be driven up and down at the same time, both of which can meet the lifting requirements of the carrying mechanism 4 and the energy storage block 5, and can be specifically set according to actual conditions.

[0112] The two-wheel drive mechanism is installed through a drive mounting mechanism, which includes relatively mounted drive supports 7 and an energy storage device mounting seat. The transmission shaft 31 and the drive wheel 3 are installed between the drive supports 7, and the electric generator is installed on the energy storage device mounting seat (not shown in the figure).

[0113] Similarly, when setting up the motor and the generator separately, the motor mounting base and the generator mounting base can be set up separately to ensure the effective installation of equipment with different functions.

[0114] The energy storage system in the present invention, in addition to the driving system located at the top, also needs to consider setting up a necessary steering mechanism in order to maintain the stability of the load-bearing and traction cycles.

[0115] Specifically, a detour wheel assembly is provided at the bottom of the energy storage system. This detour wheel assembly primarily coordinates the steering of the load-bearing track 1 and the traction rope 2 at the bottom. Preferably, to maintain the stability and integrity of the operating load-bearing surface and the drive traction surface, the detour wheel assembly also includes two parallel, vertically mounted steering wheels 32. The steering wheels 32 have the same structure as the drive wheels 3, and the wheel surfaces of the steering wheels 32 and the drive wheels 3 are arranged on the same plane. Preferably, the wheel surfaces of the steering wheels 32 and the drive wheels 3 are arranged on the same vertical plane. Each load-bearing track 1 and each traction rope 2 corresponds to a set of drive wheels 3 and steering wheels 32, with the drive traction surface formed between the set of drive wheels 3 and the steering wheels 32.

[0116] From the perspective of connection and installation, the two steering wheels 32 have the same connection and installation structure as the driving wheel 3. They are installed through the set steering support and are coaxially connected through the necessary transmission shaft 31 to ensure that the two steering wheels 32 maintain a relatively synchronous rotation relationship.

[0117] Each traction rope 2 is closed and looped between the corresponding driving wheels 3 and the steering wheels 32 in a group, forming a driving traction surface corresponding to each traction rope 2.

[0118] In order to maintain a stable and reliable fit between the traction rope 2 and the driving wheel 3 and the steering wheel 32, wheel grooves 33 are respectively provided on the wheel surfaces of the driving wheel 3 and the steering wheel 32. Preferably, the wheel grooves 33 are provided at the same position on the driving wheel 3 and the steering wheel 32 and correspond to each other up and down.

[0119] The traction rope 2 is compressed and wrapped around the wheel groove 33 , and the wheel groove 33 specifically plays a role of limiting cooperation, keeping the plane where the traction rope 2 is located parallel to the layout plane of the load-bearing rail 1 .

[0120] During operation, the traction rope 2 moves in a circular motion under the action of the friction between it, the driving wheel 3 and the steering wheel 32 when the traction rope is pressed against them. In order to enhance the friction, ensure synchronous operation and prevent slipping, a necessary anti-slip structure is provided in the wheel groove 33 to ensure continuous and stable circular motion of the traction rope 2.

[0121] At the same time, in order to ensure the tension of the traction rope 2, a tensioning mechanism is provided on the rear side of the steering wheel 32, which is a screw type as shown in the figure, to maintain the tension of the traction rope 2 and ensure its stability and reliability during operation.

[0122] The energy storage block 5 in the present invention is specifically lifted and transported by the continuous traction operation of the carrying mechanism 4. Based on the basic form of energy storage and discharge, the carrying mechanism 4 includes a carrying frame 41 located on both sides and arranged corresponding to the carrying rail 1. The carrying frame 41 can run continuously along the carrying rail 1.

[0123] To maintain synchronous lifting and lowering of the transport frames 41 on both sides along the extension direction of the support rail 1, a connecting crossbeam 42 connects the transport frames 41 on both sides, connecting the transport frames 41 into a single structure. Each transport frame 41 is equipped with a rolling wheel 43, which rolls along the support rail 1. Specifically, the rolling wheel 43 and the support rail 1 have a certain structural limit fit. Through linear contact friction between the rolling wheel 43 and the support rail 1, the rolling wheel 43 is driven by the traction rope 2 to dynamically roll. Combined with the linear contact friction, the rolling wheel 43 is converted into relative movement relative to the support rail 1 during the rolling process.

[0124] Based on the closed-loop structure of the carrying track 1, the carrier frame 41 runs in a closed loop around the carrying track 1 under the traction of the traction rope 2, especially flipping at the driving wheel 3 at the top and the steering wheel 32 at the bottom, completing relatively continuous sliding and rolling movement.

[0125] Based on the passage space for the transport mechanism 4 formed by the two driving wheels 3 and the two steering wheels 32 arranged at intervals, the energy storage block 5 in the present application is specifically installed in a form of being suspended on the transport mechanism 4.

[0126] Specifically, the connecting crossbeam 42 is provided with spaced-apart lifting arms 44 for lifting the energy storage blocks 5. These spaced-apart lifting arms 44 evenly distribute the load. Furthermore, the connecting crossbeam 42 is connected at both ends to the transport frame 41, allowing the load to be transferred to the support rail 1 via the connecting crossbeam 42 and the transport frame 41. Preferably, the connecting crossbeam 42 is provided with a stopper for limiting the position of the lifting arms 44, preventing them from lateral displacement when lifting the energy storage blocks 5.

[0127] In order for the carrier frame 41 to flip and turn in the space between the driving wheel 3 and the steering wheel 32 , it is necessary to keep the hanging cantilever 44 on the connecting beam 42 flippable.

[0128] Based on this, the lifting cantilever 44 is rotatably connected to the connecting beam 42. In this arrangement, the connecting beam 42 passes through the connecting ring at the root of the lifting cantilever 44, and the connecting ring is installed at the position of the limiting part of the connecting beam 42, so that the carrying frame 41 maintains the drooping state of the lifting cantilever 44 when flipping and changing direction.

[0129] Alternatively, the connecting beam 42 can be rotatably connected to the carrier frame 41. In this arrangement, a bearing can be provided at the root of the connecting beam 42 to enable the carrier frame 41 to maintain the original posture of the hanging cantilever 44 and the connecting beam 42 as a whole when flipping and changing direction.

[0130] From the perspective of the connection between the traction rope 2 and the carrier frame 41 , the carrier frame 41 is connected to the traction rope 2 via a rope connection mechanism 8 located on the side. The rope connection mechanism 8 is connected to the carrier frame 41 and fixed to the traction rope 2 by a clamp.

[0131] The transport frame 41 includes a mounting plate 45 for mounting the rope connection mechanism 8. At the same time, in order to consider the fixed connection relationship between the transport frame 41 and the traction rope 2 when turning over and changing direction, the rope connection mechanism 8 is mounted on the mounting plate 45 through a slewing bearing 81.

[0132] Specifically, the rope connecting mechanism 8 includes a fixing device fixed on the traction rope 2, such as a claw structure shown in the accompanying drawings.

[0133] In addition to the considerations for flipping the traction rope 2 as mentioned above, it is also important to consider the limiting guidance of the carrier frame 41 during turning, so that the carrier frame 41 can effectively and stably turn along the turning part of the carrying track 1.

[0134] The positions of the carrying track 1 located at the driving wheel 3 and the steering wheel 32 are respectively provided with slewing guide rails 9 , and the slewing guide rails 9 are used to provide stable guidance for turning and steering.

[0135] The rotary guide rail 9 includes a guide rail segment 91 and a turning rail segment 92 that are rotatably connected. The guide rail segment 91 and the turning rail segment 92 respectively include a horizontal rail and a curved rail that are separated from the support rail 1.

[0136] Specifically, the horizontal rails and the curved rails are arranged on the outside of the load-bearing rail 1 and maintain a central relative position relationship with the load-bearing rail 1. The starting end of the guide rail segment 91 is set above the horizontal guide segment 1b of the load-bearing rail 1 and is merged into one of the branch rails after the turning rail segment 92, i.e., the curved rail, is rotated. Taking the attached figure as an example, the guide rail segment 91 located above the top of the upward branch rail 11 is merged into the downward branch rail 12 after rotation, ensuring that the carrier frame 41 obtains relatively reliable steering connection.

[0137] The horizontal guide section 1b of the other branch track is broken and intercepted at the track-joining position of the rotary guide rail 9. Referring to the accompanying drawings, it can be seen that the upward branch track 11 is interrupted after passing through the arc-shaped turning section 1c and then making a certain length of the end turning section 1d, thereby completing the cross-stacked connection of the two branch tracks mentioned above.

[0138] Through the mutual coordination between different branch tracks and different rotary guide rails 9, a seamless connection of the transport frame 41 can be formed at the steering part of the driving wheel 3 and the steering wheel 32, maintaining its stable operation on the closed-loop load-bearing track 1, and providing a great extent of guarantee for the continuous operation of the transport mechanism 4.

[0139] In the present invention, the angle between the inclined section 1a of the load-bearing track 1 and the horizontal plane is 15-75 degrees, which can be actually set according to the specific hillside terrain.

[0140] At the same time, a support column 10 is provided on the outside of the bearing rail 1 , and legs 10 a are provided on the top and middle of the support column 10 to provide an installation foundation for the upward branch rail 11 and the downward branch rail 12 .

[0141] Based on the different stages of energy storage and discharge, the wheel-driven rail gravity flow energy storage system also includes a stacking yard for storing energy storage blocks 5. The stacking yard is set at the top and bottom of the energy storage system. The energy storage blocks 5 are transported back and forth between the stacking yard and the carrying track 1 through transfer equipment.

[0142] The wheel-driven track-type gravity flow energy storage system of the present invention can construct a continuous steady-state gravity flow and energy flow, and ensure high-efficiency operation of energy storage and power generation under the premise of improving carrying capacity, thereby realizing high-power storage / discharge of electric energy.

[0143] The present invention also provides a wheel-driven track-type gravity flow energy storage method, which is performed by the wheel-driven track-type gravity flow energy storage system described in the aforementioned embodiment, and specifically includes an energy storage stage and a discharge stage.

[0144] During the energy storage phase, the wheel-driven rail-type gravity flow energy storage system continuously transports the energy storage blocks 5 located in the storage yard at the bottom of the energy storage system from bottom to top, creating a continuous gravity flow through the lifting of the energy storage blocks 5. During the energy storage process, the electric generator 6 converts electrical energy into kinetic energy, which is smoothly transferred to the drive wheel 3, driving it to rotate clockwise.

[0145] The driving wheel 3 drives the traction rope 2 to start a circular motion through the friction between the driving wheel 3 and the traction rope 2. At the same time, the traction rope 2 cooperates with the steering wheel 32 to cause the steering wheel 32 to rotate in a clockwise direction.

[0146] As the traction rope 2 continues to move, the carrier mechanism 4 clamped on it is pulled and slides along the preset load-bearing track 1. The carrier mechanism 4 is equipped with a lifting cantilever 44, which lifts the energy storage block 5 located at the bottom stacking yard so that it is lifted and moved with the carrier mechanism 4. When approaching the top stacking yard, the energy storage block 5 is disengaged from the lifting cantilever 44 on the carrying trolley, and the energy storage block 5 is sent to the top stacking yard and quickly transported away by the transfer equipment for storage. The carrier mechanism 4 then enters a curved track. Subsequently, the carrier mechanism 4 continues to travel along the circular track, and eventually returns to the horizontal track again, ready to start a new round of energy storage block 5 transportation tasks.

[0147] During the discharge phase, the wheel-driven rail-type gravity flow energy storage system continuously transports the energy storage blocks 5 located at the top storage area from top to bottom, creating a continuous energy flow through the descent of the energy storage blocks 5. During the discharge process, the energy storage blocks 5 located at the top storage area are transferred to the carrying track 1 by the transfer equipment.

[0148] The energy storage block 5 is secured by a cantilever 44 on the carrier 4. Then, under the force of gravity, the energy storage block 5 and the carrier 4 slide downward along the support track 1, releasing the stored energy. The carrier 4, through its clamped connection to the traction rope 2, sets the traction rope 2 in motion.

[0149] The friction between the traction rope 2 and the wheel groove 33 transmits motion to the drive wheel 3 and the reversing wheel, causing them to rotate counterclockwise. The rotation of the drive wheel 3 is then transmitted to the electric generator 6. The electric generator 6 enters the power generation mode, converting kinetic energy into electrical energy and feeding it into the power grid.

[0150] As the energy storage block 5 approaches the bottom storage yard, it disengages from the lifting arm 44 on the transport mechanism 4 and is transported to the bottom storage yard, where it is transported by the transfer equipment for storage. The transport mechanism 4 continues to slide along the load rail 1. Eventually, the transport mechanism 4 returns to the horizontal track, ready to begin a new round of transporting energy storage blocks 5.

[0151] The carriers 4 are equidistantly connected to the traction rope 2, providing a balanced and continuous gravity flow. The energy storage blocks can be aligned with the carriers 4 or spaced apart. The speed at which the carriers 4 follow the traction rope 2 is adjustable, thus enabling adjustable gravity flow. This allows for on-demand regulation of energy flow, enabling "slow charge, fast discharge" or "charge and discharge on demand" functionality.

[0152] At the same time, the wheel-driven rail gravity flow energy storage system can also be economically and reliably designed and manufactured in modular form, and can be arranged in parallel and / or stacked up and down according to the hillside terrain to achieve larger-scale energy storage.

[0153] The energy storage system and energy storage method of the present invention are described using a specific example. When generating electricity, the energy storage block 5 is mainly made of reinforced concrete with a density of 2,500 kg / m 3 The shape is a cuboid with the dimensions of 1.5 meters long, 1.5 meters wide and 1.0 meters high, and weighs 5.625 tons.

[0154] Assuming the vertical height difference of the hillside is 500 meters, if a single energy storage block 5 is lifted from the bottom of the hill to the top, the energy that can be stored is E=mgh=5.625X10 3 kgX9.8 m / s 2 X500 m=27,562,500 J≈7.66 kWh.

[0155] Considering the operating speed of passenger ropeways, freight ropeways, and mine hoists, at 8 m / s, the system can travel 28.8 km / h. Assuming energy storage blocks 5 are spaced 10 m apart, 2880 blocks can be transported to the mountaintop per hour, storing 22050.0 kW·h (2880 blocks x 7.66 kWh per block) or 22.0 MWh (22.0 MWh) of energy.

[0156] To improve power generation capacity, multiple energy storage systems can be arranged in parallel rows and / or stacked on top of each other on a hillside. The energy storage scale can also be expanded by increasing the speed of the traction rope 2 or reducing the spacing between the energy storage blocks 5.

[0157] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0158] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A wheel-driven track-type gravity flow energy storage system, characterized in that: It includes a double-circulation bearing mechanism, a double-circulation traction mechanism and a double-wheel drive mechanism; The dual-loop carrying mechanism comprises two parallel upward-inclined closed-loop carrying rails; the dual-loop traction mechanism comprises two parallel upward-inclined closed-loop traction ropes; the dual-wheel drive mechanism comprises two parallel vertically mounted drive wheels; at least a portion of the traction rope is looped around the drive wheels and is driven by the drive wheels to continuously run; A plurality of carrying mechanisms that can run along the closed loop are provided between the carrying rails, and the traction ropes are connected to the carrying mechanisms so as to enable the traction ropes to pull and drive the carrying mechanisms to run continuously, and the carrying mechanisms are used to carry energy storage blocks as energy storage carriers; The driving wheel is connected to an electric power generation mechanism; The electric generator mechanism is used to drive the driving wheel to actively rotate, forming a continuous gravity flow through the continuously lifted energy storage block; and, driving the driving wheel to rotate by continuously descending energy storage blocks, so as to convert gravitational potential energy into electrical energy of the electric generator mechanism to form a continuous energy flow; The two bearing rails are mirror-symmetrical with respect to the traction rope, and each bearing rail comprises an upper branch rail and a lower branch rail corresponding to each other; The upward branch track and the downward branch track respectively include an inclined section, a horizontal guide section, a curved turning section and an end turning section that are arranged opposite to each other, and at least a portion of the branch track is cross-stacked at the end turning section; A turning wheel assembly is provided at the bottom of the energy storage system, and the turning wheel assembly includes two vertically mounted steering wheels arranged in parallel; A slewing guide rail is provided at the location of the driving wheel and the steering wheel. The slewing guide rail includes a slewing guide rail segment and a steering rail segment. The guide rail segment and the steering rail segment respectively include a horizontal rail and a curved rail that are separated from the load-bearing rail. The starting end of the guide rail section is arranged above the horizontal guide section and merges into one of the branch rails after the turning rail section rotates. The horizontal guide section of the other branch rail interrupts the track at the merging position of the rotating guide rail.

2. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: The dual-wheel drive mechanism includes a horizontally arranged transmission shaft, and the two driving wheels are vertically connected to the transmission shaft, or the two driving wheels are independently driven and arranged in mirror symmetry; The two traction ropes are respectively wrapped around corresponding driving wheels, so as to enable the driving wheels to drive the traction ropes to run through the friction force of the wrapping contact; An end portion of the transmission shaft is connected to the electric generator mechanism, which includes a motor generator.

3. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: The traction rope is arranged on the inner side or the outer side of the carrying track, and the carrying mechanism is connected between the two traction ropes; The closed-loop plane of the bearing track, the closed-loop plane of the traction rope, and the wheel surface of the driving wheel are parallel to each other.

4. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: The two traction ropes respectively include a single closed-loop annular traction rope, a section of which passes around the driving wheel, and the different sections of the annular traction rope corresponding to the load-bearing track are on the same plane, forming a surrounding plane of the traction rope.

5. The wheel-driven track-type gravity flow energy storage system according to claim 2, characterized in that: The driving wheel includes two active driving wheels connected by a horizontal transmission shaft, or two active driving wheels driven separately. The electric generator includes an output shaft, and the output shaft is connected to the horizontal transmission shaft through a coupling.

6. The wheel-driven track-type gravity flow energy storage system according to claim 2, characterized in that: The dual-wheel drive mechanism is arranged on the top of the energy storage system and is installed through a drive mounting mechanism. The drive mounting mechanism includes relatively erected drive supports and an energy storage device mounting seat. The transmission shaft and the drive wheel are installed between the drive supports, and the electric generator is installed on the energy storage device mounting seat.

7. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: The steering wheel has the same structure as the driving wheel, and the wheel surface of the steering wheel and the wheel surface of the driving wheel are arranged on the same plane; Each of the traction ropes is closed and looped between the driving wheels and the steering wheels that correspond to each other in a group. Wheel grooves are respectively provided on the wheel surfaces of the driving wheels and the steering wheels, and the traction ropes are compressed and looped in the wheel grooves.

8. The wheel-driven track-type gravity flow energy storage system according to claim 7, characterized in that: The transport mechanism includes transport frames located on both sides and arranged corresponding to the carrying rails, and a connecting beam is connected between the transport frames; Each of the transport frames is respectively provided with rolling wheels, which roll along the load-bearing track, and the transport frame moves in a closed loop around the load-bearing track under the traction of the traction rope; The connecting crossbeam is provided with hanging cantilevers at intervals, and the hanging cantilevers are used to hang the energy storage block, and the two ends of the connecting crossbeam are respectively connected to the carrier frame; The hanging cantilever is rotatably connected to the connecting beam, or the connecting beam is rotatably connected to the carrying frame.

9. The wheel-driven track-type gravity flow energy storage system according to claim 8, characterized in that: The transport frame is connected to the traction rope via a rope connection mechanism, the rope connection mechanism is connected to the transport frame and fixedly connected to the traction rope, the transport frame includes a mounting plate for mounting the rope connection mechanism, and the rope connection mechanism is mounted on the mounting plate via a slewing bearing.

10. The wheel-driven track-type gravity flow energy storage system according to claim 9, characterized in that: The rope connecting mechanism includes a fixing device fixed on the traction rope.

11. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: It also includes a stacking yard for storing the energy storage blocks. The stacking yard is arranged at the top and bottom of the energy storage system. The energy storage blocks are transported back and forth between the stacking yard and the carrying rails through transfer equipment.

12. A wheel-driven track-type gravity flow energy storage method, performed by the wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: Including energy storage stage and discharge stage: During the energy storage phase, the wheel-driven rail-type gravity flow energy storage system continuously transports the energy storage blocks located in the bottom yard of the energy storage system from bottom to top, and a continuous gravity flow is formed by the lifting of the energy storage blocks; During the discharge phase, the energy storage blocks located at the top of the energy storage system are continuously transported downwards through the wheel-driven rail-type gravity flow energy storage system, and a continuous energy flow is formed by the descent of the energy storage blocks.

13. The wheel-driven track-type gravity flow energy storage method according to claim 12, characterized in that: The carrying mechanism is equidistantly connected to the traction rope; The energy storage blocks may correspond to the carrying mechanism, or may correspond to the carrying mechanism at intervals. The traveling speed of the carrying mechanism following the traction rope is adjustable, thereby achieving adjustable gravity flow.

14. The wheel-driven track-type gravity flow energy storage method according to claim 12, characterized in that: The wheel-driven track-type gravity flow energy storage system includes multiple sets, and the multiple sets of the wheel-driven track-type gravity flow energy storage system are arranged in multiple rows in parallel and / or stacked up and down on the hillside terrain.

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