Wheel-driven rail type gravity flow energy storage system and energy storage method

Abstract

The invention relates to a wheel drive rail type gravity flow energy storage system and an energy storage method. The wheel drive rail type gravity flow energy storage system comprises a double-circulation bearing mechanism, a double-circulation traction mechanism and a double-wheel drive mechanism. The double-circulation bearing mechanism comprises two bearing rails, the double-circulation traction mechanism comprises two traction ropes, the double-wheel driving mechanism comprises two driving wheels which are arranged in parallel and vertically mounted, and the traction ropes are wound on the driving wheels and continuously run under the driving of the driving wheels; a plurality of carrying mechanisms are arranged between the bearing rails, the pulling rope pulls and drives the carrying mechanisms to operate continuously, and the carrying mechanisms are used for carrying energy storage blocks serving as energy storage carriers; the driving wheel is connected with an electric power generation mechanism; the electric power generation mechanism is used for driving the driving wheel to rotate actively, and continuous gravity flow is formed through the continuously-lifted energy storage block. And the energy storage block which continuously descends drives the driving wheel to rotate, so that the gravitational potential energy is converted into electric energy of the electric power generation mechanism, and continuous energy flow is formed.

Description

Technical Field

[0001] The present application relates to the field of gravity energy storage, and in particular 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 power and photovoltaic power in energy utilization has also gradually increased. However, renewable energy dominated by wind power and photovoltaic power is characterized by randomness, volatility and intermittency, and cannot fully meet the social electricity demand. Therefore, it is necessary to use energy storage systems to adjust the demand for power generation and electricity consumption.

[0003] At present, there are many forms of energy storage, including gravity energy storage, electrochemical energy storage, chemical energy storage, thermal energy storage, etc. However, electrochemical energy storage, chemical energy storage, and thermal energy storage have the problem of energy loss, are not suitable for long-term energy storage, and generally have safety issues.

[0004] Pumped storage and flywheel storage in gravity energy storage have high requirements for terrain and space, and are difficult to deploy widely. Therefore, gravity energy storage based on height difference for power generation has gradually attracted attention.

[0005] The existing gravity energy storage system uses large loads to lift and lower one by one, which mainly has the following technical problems: The intermittent load generated by raising and lowering the energy storage blocks one by one means discontinuous charging and discharging.

[0006] 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

[0007] The purpose of the present 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.

[0008] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a wheel-driven track-type gravity flow energy storage system, comprising a double-circulation bearing mechanism, a double-circulation traction mechanism and a double-wheel driving mechanism; The double-circulation bearing mechanism comprises two parallel upward inclined closed-circuit bearing rails, the double-circulation traction mechanism comprises two parallel upward inclined closed looping traction ropes, the double-wheel driving mechanism comprises two parallel vertically installed driving wheels, at least a portion of the traction ropes are looped around the driving wheels and run continuously under the drive of the driving wheels; A plurality of carrying mechanisms that can run along the closed loop are arranged between the carrying rails, and the traction rope is connected to the carrying mechanism so that the traction rope can drive the carrying mechanism to run continuously, and the carrying mechanism is used to carry the energy storage block as the energy storage carrier; The driving wheel is connected to an electric power generation mechanism; The electric power generation mechanism is used to drive the driving wheel to actively rotate, and form a continuous gravity flow through the continuously lifted energy storage block; 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.

[0009] 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; 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; The end of the transmission shaft is connected to the electric generator mechanism, and the electric generator mechanism includes an electric generator.

[0010] 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; 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.

[0011] In an optional embodiment, the two bearing rails are mirror-symmetrical with respect to the traction rope, and each bearing rail includes 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, an arc-shaped turning section and an end turning section that are arranged opposite to each other, and at least a part of the branch track is cross-stacked at the end turning section.

[0012] In an optional embodiment, the two traction ropes respectively include a single closed-loop annular traction rope, a section of the annular traction rope 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.

[0013] 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, and the output shaft is connected to the horizontal transmission shaft in sequence through a coupling.

[0014] In an optional embodiment, the dual-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.

[0015] 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 surface of the steering wheels and the wheel surface of the driving wheels 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 arranged on the wheel surfaces of the driving wheels and the steering wheels, and the traction ropes are compressed and looped in the wheel grooves.

[0016] 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; Each of the transport frames is respectively provided with rolling wheels, the rolling wheels 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; 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 transport frame; The hanging cantilever is rotatably connected to the connecting crossbeam, or the connecting crossbeam is rotatably connected to the carrying frame.

[0017] 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.

[0018] In an optional embodiment, the rope connecting mechanism includes a fixing device fixed on the traction rope.

[0019] In an optional embodiment, a slewing guide rail is provided at the location of the driving wheel and the steering wheel, and the slewing guide rail includes a slewing guide rail segment and a steering rail segment, and the guide rail segment and the steering rail segment respectively include a horizontal rail and an arc rail separated from the load-bearing rail; The starting end of the guide rail segment is arranged above the horizontal guide segment and merges into one of the branch rails after the turning rail segment rotates, and the horizontal guide segment of the other branch rail interrupts the track at the merging position of the rotating guide rail.

[0020] In an optional embodiment, it further includes a storage yard for storing the energy storage blocks, 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.

[0021] 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: During the energy storage stage, the energy storage blocks located at the bottom of the energy storage system are continuously transported from bottom to top through the wheel-driven track gravity flow energy storage system, 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 from top to bottom by the wheel-driven rail gravity flow energy storage system, and a continuous energy flow is formed by the descent of the energy storage blocks.

[0022] In an optional embodiment, the carrying mechanism is equidistantly connected to the traction rope; 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.

[0023] 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.

[0024] The wheel-driven track-type gravity flow energy storage system in the present application can realize the distributed load-bearing of gravity energy storage blocks, avoid single-point overload, and improve the safety of system operation.

[0025] Through the mutual cooperation of the load-bearing track, the carrying mechanism and the traction rope, continuous and steady-state traction operation of multiple carrying mechanisms can be formed during the operation of the driving wheel. Combined with the transportation 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.

[0026] By decoupling the load-bearing and traction formed by the load-bearing track and the traction rope, compared with the common gravity flow energy storage system, the system has a stronger load-bearing capacity and a more balanced load, making the process of forming continuous gravity flow and energy flow more stable and reliable.

[0027] The parallel arrangement of vertically mounted driving wheels can reduce space occupation, facilitate the formation of driving traction surfaces corresponding to the two traction ropes, and ensure stable and reliable continuous circulation of the traction ropes.

[0028] A three-in-one composite transmission system is constructed by cooperating with the load-bearing track, the transport mechanism and the traction rope. Compared with the traditional single-cable simultaneous load-bearing and traction, it improves the safety and stability to the greatest extent.

[0029] At the same time, the energy storage blocks are transported, lifted and transmitted by the transport mechanism. Compared with the detachable installation of the energy storage blocks, this can simplify the transport structure, reduce the additional components for frequent opening and closing of the energy storage blocks, ensure the reliability of the system installation, and reduce maintenance costs.

[0030] 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 rotation 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" function.

[0031] By combining multiple sets of wheel-driven rail-type gravity flow energy storage systems to realize parallel multi-assembly and / or up and down stacking arrangements according to the hillside terrain, larger-scale energy storage can be achieved.

[0032] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a schematic diagram of the overall structure of the wheel-driven track-type gravity flow energy storage system in this application; Figure 2 It is a structural schematic diagram of the dual-wheel drive mechanism in this application; Figure 3 It is a schematic diagram of the structure of the carrier mechanism and the energy storage block in this application; Figure 4 This is a schematic diagram of the top structure of the bearing rail in this application; Figure 5 This is a schematic diagram of the structure of the rope connection mechanism in this application.

[0035] icon: 1-carrying track; 1a-inclined section; 1b-horizontal guide section; 1c-arc-shaped turning section; 1d-end turning section; 11-upward branch track; 12-downward branch track; 2-Leash; 3-driving wheel; 3a-first active driving wheel; 3b-second active driving wheel; 31-transmission shaft; 32-steering wheel; 33-wheel groove; 4-carrying mechanism; 41-carrying frame; 42-connecting beam; 43-rolling wheel; 44-hanging cantilever; 45-mounting plate; 5-Energy storage block; 6-Electric generating mechanism; 7- driving support; 8-rope connection mechanism; 81-slewing bearing; 9-slewing guide rail; 91-guide rail section; 92-turn rail section; 10-support column; 10a-support leg. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The wheel-driven track-type gravity flow energy storage system and energy storage method in the present 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 the gravity flow and energy flow.

[0040] 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.

[0041] 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; The double-circulation carrying mechanism comprises two parallel upward inclined closed-circuit carrying rails 1, the double-circulation traction mechanism comprises two parallel upward inclined closed looping traction ropes 2, the double-wheel driving mechanism comprises two parallel vertically installed driving wheels 3, at least a part of the traction rope 2 is looped around the driving wheel 3 and runs continuously under the drive of the driving wheel 3; A plurality of carrier mechanisms 4 are provided between the carrier rails 1 and can run along the closed loop thereof. The traction rope 2 is connected to the carrier mechanism 4 so that the traction rope 2 can drive the carrier mechanism 4 to run continuously. The carrier mechanism 4 is used to carry the energy storage block 5 as an energy storage carrier. The driving wheel 3 is connected to an electric generator mechanism 6; The electric generator mechanism 6 is used to drive the driving wheel 3 to actively rotate, and form a continuous gravity flow through the continuously lifted energy storage block 5; 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 electric energy of the electric generator mechanism 6 to form a continuous energy flow.

[0042] By means of 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 a 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.

[0043] At the same time, two parallel upward-inclined closed looping 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 traction effect, combined with a carrying mechanism 4 that can operate 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 can be formed under the dual action of the load-bearing track 1 and the traction rope 2.

[0044] 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.

[0045] 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 through the release and conversion of the gravity flow in the discharge stage.

[0046] 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.

[0047] 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.

[0048] 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, thereby ensuring the stability and reliability of the load-bearing and traction effects.

[0049] Two parallel and vertically installed driving wheels 3 can be used for the traction rope 2 to wrap around. At least a part of the traction rope 2 is wrapped around the driving wheel 3. Combined with the friction between the traction rope 2 and the driving wheel 3, the driving 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.

[0050] Compared with the traditional horizontal wheel form, the vertically installed drive wheel 3 can reduce the space occupied, break through the terrain slope limitation, have simpler terrain requirements, and is convenient for installation in more slope areas. It can be deployed in a variety of terrains and is particularly suitable for complex geological environments such as mountains and hills.

[0051] On this basis, it is helpful to form a driving traction surface that matches the traction rope 2, ensuring that the traction rope 2 moves continuously on the shaped surrounding surface.

[0052] 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.

[0053] At the same time, the continuously descending energy storage block 5 can drive the driving wheel 3 to passively rotate, so that the lifted energy storage block 5 can convert the gravity energy stored in the form of potential energy into the electric energy generated by the electric generator 6 to form a continuous energy flow during the descent process.

[0054] The dual-wheel drive mechanism in the present invention includes a horizontally arranged transmission shaft 31, 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.

[0055] In another specific implementation form, 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.

[0056] 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 can drive the traction ropes 2 to run through the friction between the traction ropes 2 and the driving wheels 3 in the wrapping contact.

[0057] 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 carrier mechanism 4 to form a continuous gravity flow.

[0058] 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.

[0059] The specific form of the electric generator mechanism 6 is not limited in the present 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 the generator can perform different functions on the premise that the two drive wheels 3 maintain transmission connection.

[0060] In order to enable the carrying mechanism 4 to maintain a coordinated 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.

[0061] Based on the structural form of closed-loop circulation of the bearing track 1, closed loop of the traction rope 2 and 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 an overlap between the traction surface driven by the traction rope 2 and the looping surface of the traction rope 2 on the driving wheel 3, and at the same time constitute a stable and reliable operating bearing surface and traction surface relative to the carrying mechanism 4, thereby avoiding the risk of deviation of the carrying mechanism 4 to the greatest extent and ensuring operational stability.

[0062] From the perspective of the parallel arrangement of the bearing rails 1, the two bearing rails 1 are mirror-symmetrical with respect to the traction rope 2, and each bearing rail 1 includes an upper branch rail 11 and a lower branch rail 12 corresponding to each other; The upward branch track 11 and the downward branch track 12 respectively include an inclined section 1a, a horizontal guide section 1b, an arcuate turning section 1c and an end turning section 1d which are arranged opposite to each other, and at least a part of the branch track is cross-overlapped at the end turning section 1d.

[0063] With reference to the accompanying drawings, each of the support 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 support rail 1 by overlapping.

[0064] Specifically, after being guided by the horizontal guide section 1b and turned by the arc-shaped turning section 1c, the top of the upward branch rail 11 stops extending after maintaining a certain distance from the end turning section 1d, and cross-stacks with the horizontal guide section 1b at the top of the downward branch rail 12, thereby forming a continuous connection after the turning of the carrying mechanism 4 in the gap at the cross-stacked position.

[0065] Through the above-mentioned complex overlapping relationship, a closed-loop circulation track is formed to ensure that the transport mechanism 4 always runs on the carrying track 1, avoid the risk of derailment, and ensure stability and reliability.

[0066] 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.

[0067] From the perspective of the parallel setting of the traction ropes 2, 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 of the annular traction rope 2 corresponding to the supporting rail 1 are on the same plane, forming a closed-loop plane of the traction rope 2.

[0068] Preferably, the annular traction rope 2 is vertically arranged on the same plane, and combined with its encirclement around the driving wheel 3, a relatively stable driving traction surface parallel to the carrying rail 1 can be maintained.

[0069] 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 transmission.

[0070] 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, thereby ensuring the reliability of the drive wheel 3 in the energy storage process of driven rotation and the discharge process of passive rotation.

[0071] It should be noted that, in addition to connecting the output shaft of the electric generator with the intermediate transmission shaft 31, when the electric motor and the generator are separately provided, two separately driven active drive wheels can also be provided at the same time, so that the transmission relationship between the two drive wheels 3 can be maintained, 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, which will not be repeated here.

[0072] 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 terrain platform. Through this arrangement, the two-wheel drive mechanism can directly output and transfer the traction load to the carrier 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.

[0073] 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 and lowering requirements of the carrier mechanism 4 and the energy storage block 5, and can be specifically set according to actual conditions.

[0074] The dual-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).

[0075] Similarly, when the motor and the generator are set separately, the motor mounting seat and the generator mounting seat can be set separately to ensure the effective installation of equipment with different functions.

[0076] The energy storage system in the present invention, in addition to the driving system located at the top, also needs to consider setting up necessary steering mechanisms in order to maintain the stability of the load-bearing and traction cycles.

[0077] Specifically, a detour wheel group is arranged at the bottom of the energy storage system. The detour wheel group is mainly used to coordinate the turning of the load-bearing track 1 and the traction rope 2 at the bottom. Preferably, in order to maintain the stability and integrity of the running load-bearing surface and the driving traction surface, the detour wheel group also includes two parallel vertically installed steering wheels 32. The steering wheel 32 has the same structure as the driving wheel 3 and the wheel surface of the steering wheel 32 is arranged on the same plane as the wheel surface of the driving wheel 3. Preferably, the wheel surface of the steering wheel 32 is arranged on the same vertical plane as the wheel surface of the driving wheel 3. Each load-bearing track 1 and each traction rope 2 corresponds to a group of driving wheels 3 and steering wheels 32, and the driving traction surface is formed between a group of driving wheels 3 and steering wheels 32.

[0078] 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.

[0079] Each traction rope 2 is closed and looped between the driving wheels 3 and the steering wheels 32 that are corresponding to each group, forming a driving traction surface corresponding to each traction rope 2.

[0080] 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.

[0081] The traction rope 2 is compressed and wrapped in the wheel groove 33 , and the wheel groove 33 specifically plays a role of limiting cooperation, so as to keep the plane where the traction rope 2 is located parallel to the layout plane of the load-bearing track 1 .

[0082] 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 in a compressed state. 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.

[0083] 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.

[0084] The energy storage block 5 in the present invention is specifically lifted and transported by 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 track 1, and the carrying frame 41 can run continuously along the carrying track 1.

[0085] At the same time, in order to keep the transport frames 41 on both sides synchronously lifting and lowering along the extension direction of the load-bearing track 1, a connecting crossbeam 42 is connected between the transport frames 41, and the connecting crossbeam 42 connects the transport frames 41 on both sides into an integral structure. A rolling wheel 43 is installed on each side of the transport frame 41, and the rolling wheel 43 rolls along the load-bearing track 1. Specifically, there is a certain limit matching relationship between the rolling wheel 43 and the load-bearing track 1 in structure. Through the linear contact friction between the rolling wheel 43 and the load-bearing track 1, it is dynamically rolled under the drive of the traction rope 2, and combined with the linear contact friction, the rolling wheel 43 is converted into relative operation of the load-bearing track 1 during the rolling process.

[0086] Based on the closed-loop structure of the load-bearing track 1, the carrier frame 41 runs in a closed loop around the load-bearing 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 to complete a relatively continuous sliding and rolling movement.

[0087] 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 .

[0088] Specifically, the connecting crossbeam 42 is provided with hanging arms 44 for hanging the energy storage block 5 at intervals, and the hanging load is evenly distributed through the hanging arms 44 installed at intervals. Furthermore, the two ends of the connecting crossbeam 42 are respectively connected to the carrier frame 41, so that the hanging load is transferred to the bearing rail 1 through the connecting crossbeam 42 and the carrier frame 41. Preferably, a limiting portion for limiting the hanging arm 44 is provided on the connecting crossbeam 42 to prevent the hanging arm 44 from lateral displacement when hanging the energy storage block 5.

[0089] In order for the carrier frame 41 to flip and change direction 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.

[0090] Based on this, the hanging arm 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 hanging arm 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 can maintain the hanging state of the hanging arm 44 when flipping and changing direction.

[0091] 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.

[0092] 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 at the side, and the rope connection mechanism 8 is connected to the carrier frame 41 and fixed to the traction rope 2 clamp.

[0093] The carrier frame 41 includes a mounting plate 45 for mounting a rope connection mechanism 8. Meanwhile, in order to consider the fixed connection relationship between the carrier frame 41 and the traction rope 2 when the carrier frame 41 is flipped and changed direction, the rope connection mechanism 8 is mounted on the mounting plate 45 via a slewing bearing 81.

[0094] 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.

[0095] In addition to the considerations for flipping the traction rope 2 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 load-bearing track 1.

[0096] The positions of the bearing track 1 located at the driving wheel 3 and the steering wheel 32 are respectively provided with swivel guide rails 9 , and the swivel guide rails 9 are used to provide stable guidance for turning and steering.

[0097] The rotary guide rail 9 includes a rotary connected guide rail segment 91 and a turning rail segment 92 , and the guide rail segment 91 and the turning rail segment 92 respectively include a horizontal rail and an arc rail which are separated from the load-bearing rail 1 .

[0098] Specifically, the horizontal rails and the arc 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 arranged above the horizontal guide segment 1b of the load-bearing rail 1 and is merged into one of the branch rails after the rotation of the turning rail segment 92, i.e., the arc rail. 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 transport frame 41 obtains a relatively reliable steering connection.

[0099] The horizontal guide section 1b of the other branch track is broken and intercepted at the merging 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 a certain length of the end turning section 1d, thereby completing the cross-over and overlapping of the two branch tracks mentioned above.

[0100] Through the mutual coordination between different branch rails 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 rail 1, and providing guarantee for the continuous operation of the transport mechanism 4 to a great extent.

[0101] In the present invention, the angle between the inclined section 1a of the load-bearing track 1 and the horizontal plane is 15-75°, which can be actually set according to the specific hillside terrain.

[0102] Meanwhile, a support column 10 is arranged on the outer side of the bearing rail 1 , and legs 10 a are arranged on the top and the middle of the support column 10 , so as to provide an installation foundation for the upward branch rail 11 and the downward branch rail 12 .

[0103] From 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 arranged 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.

[0104] 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.

[0105] 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.

[0106] In the energy storage stage, the energy storage blocks 5 located at the bottom of the energy storage system are continuously transported from bottom to top by the wheel-driven rail gravity flow energy storage system, and a continuous gravity flow is formed by 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 transmitted to the driving wheel 3, driving it to rotate in a clockwise direction.

[0107] The driving wheel 3 drives the traction rope 2 to start to run around through the friction between its surface 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.

[0108] As the traction rope 2 continues to move, the carrier mechanism 4 clamped thereon is pulled to slide and roll 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 finally returns to the horizontal track again, ready to start a new round of energy storage block 5 transportation tasks.

[0109] In the discharge phase, the energy storage blocks 5 located at the top stacking yard of the energy storage system are continuously transported from top to bottom by the wheel-driven rail gravity flow energy storage system, and a continuous energy flow is formed by the falling of the energy storage blocks 5. During the discharge process, the energy storage blocks 5 located at the top stacking yard are transported to the carrying track 1 by the transport equipment.

[0110] The energy storage block 5 is fixed by the hanging cantilever 44 on the carrier mechanism 4. Then, under the action of gravity, the energy storage block 5 slides down along the carrying track 1 with the carrier mechanism 4, releasing the contained energy. The carrier mechanism 4 drives the traction rope 2 to start moving through its clamping connection with the traction rope 2.

[0111] The traction rope 2 transmits the motion to the driving wheel 3 and the reversing wheel through the friction between the traction rope 2 and the wheel groove 33, driving them to rotate in the counterclockwise direction. The rotation of the driving wheel 3 is then transmitted to the electric generator 6. The electric generator 6 enters the power generation mode, converts the kinetic energy into electrical energy, and inputs it into the power grid.

[0112] When approaching the bottom storage yard, the energy storage block 5 is disengaged from the hanging cantilever 44 on the carrying mechanism 4, and the energy storage block 5 is sent to the bottom storage yard and transported away by the transfer equipment for storage. The carrying mechanism 4 continues to slide and roll along the carrying track 1. Finally, the carrying mechanism 4 returns to the horizontal track, ready to start a new round of energy storage block 5 transportation task.

[0113] The carrier mechanism 4 is connected to the traction rope 2 at equal distances, which can provide a balanced and continuous gravity flow. At the same time, the energy storage block can correspond to the carrier mechanism 4, or can correspond to the carrier mechanism 4 at intervals. The speed of the carrier mechanism 4 following the traction rope 2 is adjustable, thereby realizing the adjustable gravity flow. In this way, the energy flow can be adjusted as needed, thereby realizing the "slow charging and fast discharging" or "charging and discharging on demand" function.

[0114] At the same time, the wheel-driven rail-type gravity flow energy storage system can also be designed and manufactured in an economical and reliable modular manner, and can be arranged in parallel and / or stacked up and down according to the hillside terrain to achieve larger-scale energy storage.

[0115] The energy storage system and energy storage method of the present invention are described by taking 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 a length of 1.5 meters, a width of 1.5 meters, and a height of 1.0 meters, and weighs 5.625 tons.

[0116] Assuming the vertical height difference of the hillside is 500 meters, a single energy storage block 5 is lifted from the bottom of the hill to the top of the hill, and 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.

[0117] Referring to the operating speed of passenger ropeways, freight ropeways, mine hoists and other equipment, if the speed is 8 m / s, it can run 28.8 km per hour. Assuming that the energy storage blocks 5 are arranged at intervals of 10 m, 2880 energy storage blocks 5 can be transported to the top of the mountain per hour, and 2880 x 7.66 kWh / block = 22050.0 kW·h≈22.0 MWh of energy can be stored per hour.

[0118] In order to improve the power generation capacity, multiple energy storage systems can be arranged in parallel rows and / or stacked up and down on the hillside terrain, or the speed of the traction rope 2 can be increased or the spacing between the energy storage blocks 5 can be reduced to expand the energy storage scale.

[0119] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0120] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope 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 driving mechanism; The double-circulation bearing mechanism comprises two parallel upward inclined closed-circuit bearing rails, the double-circulation traction mechanism comprises two parallel upward inclined closed looping traction ropes, the double-wheel driving mechanism comprises two parallel vertically installed driving wheels, at least a portion of the traction ropes are looped around the driving wheels and run continuously under the drive of the driving wheels; A plurality of carrying mechanisms that can run along the closed loop are arranged between the carrying rails, and the traction rope is connected to the carrying mechanism so that the traction rope can drive the carrying mechanism to run continuously, and the carrying mechanism is used to carry the energy storage block as the energy storage carrier; The driving wheel is connected to an electric power generation mechanism; The electric power generation mechanism is used to drive the driving wheel to actively rotate, and form a continuous gravity flow through the continuously lifted energy storage block; 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.

2. The wheel-driven track-type gravity flow energy storage system according to claim 1, characterized in that: The dual-wheel drive mechanism comprises 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 the corresponding driving wheels, so that the driving wheels drive the traction ropes to run through the friction force of the wrapping contact; The end of the transmission shaft is connected to the electric generator mechanism, and the electric generator mechanism 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 load-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 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, an arc-shaped turning section and an end turning section that are arranged opposite to each other, and at least a part of the branch track is cross-stacked at the end turning section.

5. 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 different sections of the annular traction rope corresponding to the bearing track are on the same plane, forming a surrounding plane of the traction rope.

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

7. 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.

8. The wheel-driven track-type gravity flow energy storage system according to claim 4, characterized in that: A detour wheel group is arranged at the bottom of the energy storage system, and the detour wheel group includes two vertically installed steering wheels arranged in parallel, the steering wheels have the same structure as the driving wheels, and the wheel surface of the steering wheels and the wheel surface of the driving wheels 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 arranged on the wheel surfaces of the driving wheels and the steering wheels, and the traction ropes are compressed and looped in the wheel grooves.

9. The wheel-driven track-type gravity flow energy storage system according to claim 8, characterized in that: The transport mechanism comprises transport frames located on both sides and arranged corresponding to the carrying rails, and a connecting crossbeam is connected between the transport frames; Each of the transport frames is respectively provided with rolling wheels, the rolling wheels 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 transport frame; The hanging cantilever is rotatably connected to the connecting crossbeam, or the connecting crossbeam is rotatably connected to the carrying frame.

10. The wheel-driven track-type gravity flow energy storage system according to claim 9, 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 comprises a mounting plate for mounting the rope connection mechanism, and the rope connection mechanism is mounted on the mounting plate via a slewing bearing.

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

12. The wheel-driven track-type gravity flow energy storage system according to claim 9, characterized in that: A slewing guide rail is provided at the driving wheel and the steering wheel, and the slewing guide rail includes a slewing guide rail section and a steering rail section, and the guide rail section and the steering rail section respectively include a horizontal rail and an arc rail separated from the bearing rail; The starting end of the guide rail segment is arranged above the horizontal guide segment and merges into one of the branch rails after the turning rail segment rotates, and the horizontal guide segment of the other branch rail interrupts the track at the merging position of the rotating guide rail.

13. 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 track by a transfer device.

14. 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 stage, the energy storage blocks located at the bottom of the energy storage system are continuously transported from bottom to top through the wheel-driven track gravity flow energy storage system, 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 from top to bottom by the wheel-driven rail gravity flow energy storage system, and a continuous energy flow is formed by the descent of the energy storage blocks.

15. The wheel-driven track-type gravity flow energy storage method according to claim 14, characterized in that: The carrying mechanism is equidistantly connected to the traction rope; 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.

16. The wheel-driven track-type gravity flow energy storage method according to claim 14, characterized in that: The wheel-driven track-type gravity flow energy storage system comprises a plurality of sets, and the plurality of 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 a hillside.

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