阅读说明：本技术 流体复用储能系统 (Fluid reuse energy storage system ) 是由 朱晋 韦统振 于 2020-12-29 设计创作，主要内容包括：本发明属于抽水储能发电技术领域,旨在解决如何在降低挖掘成本的同时提升储存能量,具体涉及一种流体复用储能系统,包括流体存储模块、驱动装置以及N个储能模块,每个储能模块均包括容器与储能系统；N个储能模块并联可连通设置,且N个储能模块与驱动装置均可连通设置；用电低谷时,流体通过驱动装置从流体存储模块流入储能模块通过储能系统存储势能；已储能的储能模块中的流体经过驱动装置进入下一个储能模块以存储对应的能量,直至M个储能模块均储能；用电时,已储能的各个储能模块中储存能量压出的流体均可驱动驱动装置进行发电；通过本发明可实现储能系统建造成本的降低同时提高系统的储存能量。(The invention belongs to the technical field of water pumping energy storage power generation, and aims to solve the problem of how to improve stored energy while reducing excavation cost, in particular to a fluid reuse energy storage system which comprises a fluid storage module, a driving device and N energy storage modules, wherein each energy storage module comprises a container and an energy storage system; the N energy storage modules are connected in parallel and can be communicated, and the N energy storage modules and the driving device can be communicated; when the electricity is used in a valley, the fluid flows into the energy storage module from the fluid storage module through the driving device and stores potential energy through the energy storage system; the fluid in the stored energy storage module enters the next energy storage module through the driving device to store corresponding energy until the M energy storage modules store energy; when electricity is used, the fluid which is pressed out by the stored energy in each energy storage module and stores the energy can drive the driving device to generate electricity; the invention can reduce the construction cost of the energy storage system and improve the stored energy of the system.)

1. The fluid multiplexing energy storage system is characterized by comprising a fluid storage module, a driving device and N energy storage modules which are communicated with the fluid storage module, wherein the fluid storage module is used for storing fluid; each energy storage module comprises a container and an energy storage system; the N energy storage modules are connected in parallel and can be arranged in a communicating manner, and the N energy storage modules and the driving device can be arranged in a communicating manner;

when energy is stored, the fluid flows into the energy storage module from the fluid storage module through the driving device to act on the energy storage system to push the energy storage system to the upper half part of the container so as to store energy; the fluid in the energy storage module with stored potential energy can enter the next energy storage module through the driving device to store corresponding potential energy until the M energy storage modules store energy;

when the power is used, the energy storage system on the upper half part of the container, which stores energy, acts on the fluid on the lower half part of the container to press out the fluid to the next energy storage module and drive the driving device to generate power at the same time until P energy storage systems in the energy storage modules generate power for P times.

2. The fluid reuse energy storage system according to claim 1, wherein N ≧ 2; m is less than or equal to N; p is less than or equal to N; p is more than or equal to 2.

3. The fluid reuse energy storage system of claim 1, wherein said energy storage system comprises a weight piston; the weight piston is arranged in a clearance with the container, and can move upwards under the action of fluid pushing to store potential energy or push the fluid to move to the next energy storage module under the action of self gravity;

the energy storage module is arranged in an open manner; the bottom end of the energy storage module is provided with a pipe outlet and a pipe inlet, and the pipe outlet and the pipe inlet are respectively provided with a first control valve and a second control valve so as to respectively control the outflow and inflow of fluid in the energy storage module;

and an outflow control valve and an inflow control valve are arranged at two ends of the fluid storage module.

4. The fluid multiplexing energy storage system according to claim 3, further comprising N sets of position-limiting devices for limiting and fixing the N energy storage modules in the potential energy storage state;

the clamping device is arranged between the weight piston and the container, and is in a first state when the weight piston moves up and down and in a second state when the weight piston rises to a set position; the first state is a state of noninterference with the movement of the weight piston; the set position is the position of the weight piston when fluid is jacked up; the second state is a state of clamping and bearing the weight piston.

5. The fluid reuse energy storage system according to claim 4, wherein said detent device is disposed at a top end of said container; the clamping device comprises a first clamping device and a second clamping device, and the first clamping device and the second clamping device are arranged oppositely; a first arc-shaped bulge is arranged on the inner side of the first clamping device, and a second arc-shaped bulge is arranged on the inner side of the second clamping device; a first arc-shaped groove and a second arc-shaped groove are formed in the outer side of the weight piston;

when the weight piston ascends to a set position, the first clamping device and the second clamping device can move inwards under the driving of the clamping power device to drive the first arc-shaped protrusion and the second arc-shaped protrusion to be clamped with the first arc-shaped groove and the second arc-shaped groove respectively so as to fixedly bear the weight piston.

6. The fluid reuse energy storage system of claim 5, wherein the first and second arc-shaped protrusions are a first and second semi-circular caliper structure, respectively;

and when the weight piston is in a rising fixed state, the first semicircular caliper structure, the second semicircular caliper structure and the weight piston form a concentric cylindrical structure.

7. The fluid reuse energy storage system of claim 6, wherein said clamping device further comprises a first fixing device and a second fixing device, said first fixing device and said second fixing device are respectively disposed at ends of said first clamping device and said second clamping device far away from said weight piston, so as to respectively fix said first clamping device and said second clamping device.

8. The fluid reuse energy storage system according to claim 4, wherein the locking device comprises a first set of locking devices and a second set of locking devices, the first set of locking devices and the second set of locking devices are respectively disposed on a first sidewall and a second sidewall of the container, and the first sidewall and the second sidewall are opposite inner sidewalls;

the first group of clamping devices comprise a plurality of first bulges, and the first bulges are arranged on the first side wall in parallel; the first bulges are arranged in a telescopic manner; the second group of clamping devices comprise a plurality of second bulges, and the second bulges are arranged on the second side wall in parallel; the second protrusions are arranged in a telescopic manner;

the side wall of the weight piston is provided with a plurality of first grooves matched with the first bulges and a plurality of second grooves matched with the second bulges; when the weight piston ascends to a set position, the first bulges and the second bulges are driven by the clamping power device to extend inwards and are clamped and fixed with the first grooves and the second grooves respectively.

9. The fluid reuse energy storage system according to claim 3, wherein said weight piston is further provided with a piston counterweight device for counterweighting said weight piston;

the fluid reuse energy storage system further comprises an anti-roll guide rail device, and the anti-roll guide rail device is arranged on the inner wall of the container; the anti-roll guide rail device comprises a support body, a spring telescopic rod and an elastic contact head, wherein the spring telescopic rod is fixedly arranged on the support body; the elastic contact head is arranged at the end part of the spring telescopic rod far away from the support body;

a vertical guide groove capable of accommodating the elastic contact head is formed in the outer side of the weight piston, and the distance from the end part of the elastic contact head to the inner wall of the container is larger than the distance from the outer side of the weight piston to the inner wall of the container;

an annular sealing assembly is arranged between the weight piston and the container, the annular sealing assembly comprises an annular supporting device and an annular sealing device, and the annular sealing device is fixedly arranged on the inner wall of the container through the annular supporting device;

the annular sealing device is in interference fit with the weight piston; the annular sealing device seals a chamber between the annular sealing device and the container at all times during the lifting and lowering of the weight piston.

10. The fluid multiplexing energy storage system according to claim 1, wherein the container comprises an upper high-pressure gas chamber and a lower high-pressure gas chamber, a communication channel is arranged between the upper high-pressure gas chamber and the lower high-pressure gas chamber, and the communication channel is provided with an opening and closing device to control the communication or isolation of the lower high-pressure gas chamber and the upper high-pressure gas chamber; the diameter of the communication channel is smaller than the inner diameter of the container;

when the adjacent energy storage modules need to store energy, fluid flows into the energy storage modules from the fluid storage modules through the driving device, high-pressure gas in the lower high-pressure gas cavity corresponding to the energy storage modules is extruded to the upper high-pressure gas cavity through the communication channel, and the upper high-pressure gas cavity is sealed through the opening and closing device, so that compression energy storage of the high-pressure gas is performed; the fluid in the stored energy storage module enters the next energy storage module through the driving device to store corresponding energy;

when electricity is used, the compressed high-pressure gas in the upper high-pressure gas chamber presses out fluid to the next energy storage module through the communication channel and drives the driving device to generate electricity.

Technical Field

The invention belongs to the technical field of water pumping, energy storage and power generation, and particularly relates to a fluid reuse energy storage system.

Background

For a long time, in order to meet the requirements of power loads, the power department has to build power generation capacity according to the maximum load requirements; this results in, on the one hand, a large surplus and waste of power generation capacity and, on the other hand, the power department has to restrict the power consumption often during peak periods. In particular, in recent years, the number of large units in a power grid in China is increasing, the self power regulation capability of a power system is limited, and the peak-to-valley ratio of system load is increasing, so that an economic, reliable and efficient power energy storage system is urgently needed to be matched with the system.

At present, the existing power energy storage technology is mainly used in a pumping power station which operates in a large-scale commercial system, the pumping power station energy storage system sends water from a low-level reservoir to a high-level reservoir through a water pump at a power utilization valley, so that electric energy is converted into potential energy of the water to be stored, at a power utilization peak, the water is discharged from the high-level reservoir to the low-level reservoir to drive a water turbine to generate electricity, however, most of the existing pumping power station energy storage systems need special geographical conditions to build a reservoir and a dam, the building period is long, the cost is high, the pumping power station has high requirements on site selection conditions such as terrain and geology, meanwhile, the energy stored by the existing energy storage system is usually matched with the same proportion of the water usage amount, and high-multiple energy storage of the.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve how to improve the stored energy while reducing the excavation cost, the present invention provides a fluid reuse energy storage system, which includes a fluid storage module, a driving device, and N energy storage modules that can be communicated with the fluid storage module, wherein the fluid storage module is used for storing fluid; each energy storage module comprises a container and an energy storage system; the N energy storage modules are connected in parallel and can be arranged in a communicating manner, and the N energy storage modules and the driving device can be arranged in a communicating manner;

when energy is stored, the fluid flows into the energy storage module from the fluid storage module through the driving device to act on the energy storage system to push the energy storage system to the upper half part of the container so as to store energy; the fluid in the energy storage module with stored potential energy can enter the next energy storage module through the driving device to store corresponding potential energy until the M energy storage modules store energy;

when the power is used, the energy storage system on the upper half part of the container, which stores energy, acts on the fluid on the lower half part of the container to press out the fluid to the next energy storage module and drive the driving device to generate power at the same time until P energy storage systems in the energy storage modules generate power for P times.

In some preferred embodiments, N.gtoreq.2; m is less than or equal to N; p is less than or equal to N; p is more than or equal to 2.

In some preferred embodiments, the energy storage system comprises a weight piston; the weight piston is arranged in a clearance with the container, and can move upwards under the action of fluid pushing to store potential energy or push the fluid to move to the next energy storage module under the action of self gravity;

the energy storage module is arranged in an open manner; the bottom end of the energy storage module is provided with a pipe outlet and a pipe inlet, and the pipe outlet and the pipe inlet are respectively provided with a first control valve and a second control valve so as to respectively control the outflow and inflow of fluid in the energy storage module;

and an outflow control valve and an inflow control valve are arranged at two ends of the fluid storage module.

In some preferred embodiments, the system further comprises N sets of clamping devices for limiting and fixing the N energy storage modules in the potential energy storage state respectively;

the clamping device is arranged between the weight piston and the container, and is in a first state when the weight piston moves up and down and in a second state when the weight piston rises to a set position; the first state is a state of noninterference with the movement of the weight piston; the set position is the position of the weight piston when fluid is jacked up; the second state is a state of clamping and bearing the weight piston.

In some preferred embodiments, the detent device is disposed at a top end of the container; the clamping device comprises a first clamping device and a second clamping device, and the first clamping device and the second clamping device are arranged oppositely; a first arc-shaped bulge is arranged on the inner side of the first clamping device, and a second arc-shaped bulge is arranged on the inner side of the second clamping device; a first arc-shaped groove and a second arc-shaped groove are formed in the outer side of the weight piston;

when the weight piston ascends to a set position, the first clamping device and the second clamping device can move inwards under the driving of the clamping power device to drive the first arc-shaped protrusion and the second arc-shaped protrusion to be clamped with the first arc-shaped groove and the second arc-shaped groove respectively so as to fixedly bear the weight piston.

In some preferred embodiments, the first and second arcuate projections are first and second semi-circular caliper structures, respectively;

and when the weight piston is in a rising fixed state, the first semicircular caliper structure, the second semicircular caliper structure and the weight piston form a concentric cylindrical structure.

In some preferred embodiments, the locking device further includes a first fixing device and a second fixing device, and the first fixing device and the second fixing device are respectively disposed at ends of the first locking device and the second locking device far away from the weight piston to respectively fix the first locking device and the second locking device.

In some preferred embodiments, the locking device includes a first set of locking devices and a second set of locking devices, the first and second sets of locking devices are respectively disposed on a first side wall and a second side wall of the container, and the first side wall and the second side wall are opposite inner side walls;

the first group of clamping devices comprise a plurality of first bulges, and the first bulges are arranged on the first side wall in parallel; the first bulges are arranged in a telescopic manner; the second group of clamping devices comprise a plurality of second bulges, and the second bulges are arranged on the second side wall in parallel; the second protrusions are arranged in a telescopic manner;

the side wall of the weight piston is provided with a plurality of first grooves matched with the first bulges and a plurality of second grooves matched with the second bulges; when the weight piston ascends to a set position, the first bulges and the second bulges are driven by the clamping power device to extend inwards and are clamped and fixed with the first grooves and the second grooves respectively.

In some preferred embodiments, the weight piston is further provided with piston weighting means for weighting the weight piston;

the fluid reuse energy storage system further comprises an anti-roll guide rail device, and the anti-roll guide rail device is arranged on the inner wall of the container; the anti-roll guide rail device comprises a support body, a spring telescopic rod and an elastic contact head, wherein the spring telescopic rod is fixedly arranged on the support body; the elastic contact head is arranged at the end part of the spring telescopic rod far away from the support body;

a vertical guide groove capable of accommodating the elastic contact head is formed in the outer side of the weight piston, and the distance from the end part of the elastic contact head to the inner wall of the container is larger than the distance from the outer side of the weight piston to the inner wall of the container;

an annular sealing assembly is arranged between the weight piston and the container, the annular sealing assembly comprises an annular supporting device and an annular sealing device, and the annular sealing device is fixedly arranged on the inner wall of the container through the annular supporting device;

the annular sealing device is in interference fit with the weight piston; the annular sealing device seals a chamber between the annular sealing device and the container at all times during the lifting and lowering of the weight piston.

In some preferred embodiments, the container comprises an upper high-pressure gas chamber and a lower high-pressure gas chamber, a communication channel is arranged between the upper high-pressure gas chamber and the lower high-pressure gas chamber, and the communication channel is provided with an opening and closing device to control the communication or isolation of the lower high-pressure gas chamber and the upper high-pressure gas chamber; the diameter of the communication channel is smaller than the inner diameter of the container;

when the adjacent energy storage modules need to store energy, fluid flows into the energy storage modules from the fluid storage modules through the driving device, high-pressure gas in the lower high-pressure gas cavity corresponding to the energy storage modules is extruded to the upper high-pressure gas cavity through the communication channel, and the upper high-pressure gas cavity is sealed through the opening and closing device, so that compression energy storage of the high-pressure gas is performed; the fluid in the stored energy storage module enters the next energy storage module through the driving device to store corresponding energy;

when electricity is used, the compressed high-pressure gas in the upper high-pressure gas chamber presses out fluid to the next energy storage module through the communication channel and drives the driving device to generate electricity.

1) According to the fluid multiplexing energy storage system provided by the invention, the plurality of energy storage modules can be communicated through the pipeline system and the corresponding valves, and the liquid among the energy storage modules can be controlled to flow in a modularized arrangement mode, so that the jacking of weight pistons in the plurality of energy storage modules or the compression of high-pressure gas can be carried out by utilizing the using amount of fluid with a fixed amount, and the energy of multiple times of potential energy or compressed gas can be stored; when electricity is needed, the potential energy or compressed gas energy stored in the energy storage modules is used for extruding the fluid to further push the water turbine to generate electricity, and the fixed amount of fluid is reused in the energy storage modules to generate electricity for multiple times.

2) The clamping device provided by the invention can fix the weight piston at a high position, the weight piston still keeps a set height after the liquid falls back, the position of the weight piston is not required to be maintained through the liquid, the reuse of a fixed amount of fluid can be realized, the excavation cost is reduced, and the total stored energy of the system is improved; or the opening and closing device which is arranged in each energy storage module and used for opening and closing the communication device can seal compressed gas entering the high-pressure gas chamber in the corresponding energy storage module, the energy of the compressed gas is kept after the liquid falls back, the position is not required to be maintained through the liquid, the reuse of the fixed amount of fluid can be realized, the excavation cost is reduced, and the total stored energy of the system is improved.

3) This patent is based on valve system, pipe-line system and screens system, proposes a set of unique modularization solid pressure boost fluid medium energy storage system, when obtaining the storage energy of same gravitational potential energy, divide into N energy storage modules with the system, through the coordinated control between the module, the storage of N times potential energy can be realized to the fluid of fixed quantity to and the number of times of electricity generation, be fit for lacking water area and promote, and show the excavation cost that has reduced the system, total cost restriction and geographical environmental restriction have effectively been solved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic top view of one embodiment of a fluid reuse energy storage system of the present invention;

FIG. 2 is a schematic top view of another embodiment of a fluid reuse energy storage system according to the present invention;

FIG. 3 is a schematic left side cross-sectional view of one embodiment of a module III in a fluid-reusing energy storage system of the present invention;

FIG. 4 is a schematic structural diagram of a position-locking device in the fluid reuse energy storage system according to an embodiment of the present invention;

FIG. 5 is a partial schematic view of an exemplary embodiment of the detent mechanism of FIG. 4 in an inoperative position;

FIG. 6 is a partial schematic view of an exemplary embodiment of the detent mechanism of FIG. 4 in an operative position;

fig. 7 is a schematic structural diagram of another embodiment of the clamping device in the fluid reuse energy storage system of the present invention.

Description of reference numerals:

110. a first module 111, a first control valve 112 and a second control valve; 120. a second module 121, a third control valve 122 and a fourth control valve; 130. module three, 131, a fifth control valve, 132, a sixth control valve; 140. a container; 150. a weight piston;

200. a matched water reservoir 210, an outflow control valve 220 and an inflow control valve;

300. an annular seal assembly;

400. the clamping device 410, the first clamping device 411, the first horizontal guide rail 412, the first fixing device 413, the first semicircular caliper structure 414 and the first protrusion; 420. the second clamping device 421, the second horizontal guide rail 422, the second fixing device 423, the second semicircular caliper structure 424 and the second protrusion;

500. the system comprises a driving device 501, a water pump 502 and a hydraulic generator.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, and it will be understood by those skilled in the art that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of the present invention.

The invention discloses a fluid multiplexing energy storage system, which comprises a fluid storage module, a driving device and N energy storage modules, wherein the N energy storage modules can be communicated with the fluid storage module; each energy storage module comprises a container and an energy storage system; the N energy storage modules are connected in parallel and can be communicated, and the N energy storage modules and the driving device can be communicated, wherein N is more than or equal to 2, and fluid in the energy storage system can be reused through the arrangement of at least two energy storage modules; when energy is stored, the fluid flows into the energy storage module from the fluid storage module through the driving device to act on the energy storage system so as to push the energy storage system to the upper half part of the container to store energy; the fluid in the energy storage module with stored potential energy can enter the next energy storage module through the driving device to store corresponding potential energy until M energy storage modules store energy, in the invention, M is less than or equal to N, namely the energy storage module needing to store potential energy in the system can be flexibly arranged according to actual requirements; when the power is used, the energy storage system which stores energy and is positioned at the upper half part of the container acts on the fluid at the lower half part of the container to press the fluid to the next energy storage module and simultaneously drive the driving device to generate power until the energy storage systems in the P energy storage modules generate power for P times.

When the energy storage system comprises a weight piston, the weight piston and the container are arranged in a clearance mode, and the weight piston can be jacked up to store potential energy after fluid enters the corresponding energy storage module; the N energy storage modules are connected in parallel and can be communicated, and the N energy storage modules and the driving device can be communicated; when the electricity consumption is low, the fluid in the fluid storage module can flow into any energy storage module from the fluid storage module under the driving of the driving device, and the weight piston in the fluid storage module is jacked up to store potential energy, the corresponding weight piston is fixed through the clamping device in the corresponding energy storage module, and at the moment, the height of the weight piston can be ensured to be fixed without jacking force of the fluid; the fluid in the energy storage module with stored potential energy can enter the next energy storage module through the driving device to store corresponding potential energy, and so on until the M energy storage modules store potential energy; when electricity is needed, the fluid pressed out by the potential energy in each energy storage module which stores the potential energy can drive the driving device to generate electricity, and the fluid consumption can be set for generating electricity for multiple times; by the system disclosed by the invention, the middle weight pistons in the N energy storage modules can be repeatedly pushed up by the fluid consumption of a single energy storage module, compared with the energy storage system in the prior art, the fluid consumption of the total system is reduced to 1/N, and the volume page of the fluid storage pool needing to be excavated is reduced to 1/N.

The system also comprises N groups of clamping devices which are respectively used for limiting and fixing the N energy storage modules in a potential energy storage state; the clamping device is arranged between the weight piston and the container, is in a first state when the weight piston moves up and down, and clamps and bears the weight piston when the weight piston rises to a set position; the first state is a state which does not interfere with the movement of the weight piston; the set position is the position of the weight piston when topped up by a set amount of fluid.

Further, the fluid in the present invention may be a gas or a liquid.

Preferably, the weight piston is cylindrical and the container is cylindrical.

When the energy storage system is used for compressing and storing energy by high-pressure gas, the container comprises an upper high-pressure gas chamber and a lower high-pressure gas chamber, a communication channel is arranged between the upper high-pressure gas chamber and the lower high-pressure gas chamber, and the communication channel is provided with an opening and closing device for controlling the communication or isolation of the lower high-pressure gas chamber and the upper high-pressure gas chamber; the diameter of the communication channel is smaller than the inner diameter of the container; when the adjacent energy storage modules need to store energy, fluid flows into the energy storage modules from the fluid storage modules through the driving device, high-pressure gas in the lower high-pressure gas chamber in the corresponding energy storage module is extruded to the upper high-pressure gas chamber through the communication channel, and the upper high-pressure gas chamber is sealed through the opening and closing device so as to compress and store energy of the high-pressure gas; the fluid in the stored energy storage module enters the next energy storage module through the driving device to store corresponding energy; when the power is used, the compressed high-pressure gas in the upper high-pressure gas chamber presses out fluid to the next energy storage module through the communication channel and drives the driving device to generate power at the same time.

In the prior art, a large amount of liquid is generally needed to lift a heavy object and continuously support the heavy object at a high position so as to store potential energy; when the weight falls down, the liquid is squeezed by the weight and is discharged from the container below the weight, and when the potential energy is stored by multiple times, the potential energy is stored by jacking the weight by multiple times of the liquid, so that an additional place is needed for storing the liquid; in addition, the lifting of the weight and the supply of electricity are carried out in a container disclosed in the prior art, when the potential energy needs to be stored, water is firstly introduced into the container above the weight, and the water and the weight are essentially switched between the upper position and the lower position; when the weight is lifted to h height, water is pumped out from the upper part of the weight and is injected into the lower part of the weight, when the system absorbs mgh energy, the water also drops to h height, and m of the water is released_{Water (W)}gravitational potential energy of gh; the total stored energy of the system needs to be subtracted by m_{Water (W)}gh, when the weight density is not high, m is subtracted_{Water (W)}gh will significantly affect the overall system energy storage. In the prior art, an energy storage system is built beside a lake, and a natural lake is used for solving the problem that an extra place is needed for storing liquid, but because the system is usually used for super-large-scale energy storage, when a heavy object is lifted, a large amount of water is consumed, the water level of the lake is reduced, the environment is influenced, the system is limited by geographical conditions, the system must be beside the lake, or a very large digging amount is needed to dig out an extra container for storing the liquid lifted and fallen by the heavy object supporting heavy object, and the system cost is obviously increased. The fluid reuse energy storage system provided by the invention can realize the setting of the fluid consumptionThe system has the advantages that multiple times of potential energy storage and multiple times of electricity supply are realized, only one water storage tank for storing set fluid quantity is needed, meanwhile, the construction cost can be effectively reduced, and meanwhile, the total potential energy storage of the system can be improved.

The present invention will be further described with reference to the accompanying drawings in conjunction with specific embodiments, and for the sake of understanding, the following description will be made in detail by taking the fluid as the liquid, the energy storage modules as three, and the energy storage system as the weight piston.

Referring to fig. 1, a schematic top view of an embodiment of a fluid reuse energy storage system according to the present invention is shown, the system includes a first module 110, a second module 120, a third module 130, a mating reservoir 200, and a driving device 500, wherein the first module, the second module, and the third module are all energy storage modules, and the three energy storage modules, the energy storage modules, and the mating reservoir are all configured to communicate with each other; a first outlet pipe orifice and a first inlet pipe orifice are respectively arranged on two sides of the bottom end of the first module, and a first control valve 111 and a second control valve 112 are arranged at the first outlet pipe orifice and the first inlet pipe orifice so as to control the outflow and inflow of water in the first module; a second outlet pipe orifice and a second inlet pipe orifice are respectively arranged on two sides of the bottom end of the second module, and a third control valve 121 and a fourth control valve 122 are arranged at the second outlet pipe orifice and the second inlet pipe orifice so as to control the outflow and inflow of the water in the second module; a third outlet pipe orifice and a third inlet pipe orifice are respectively arranged on two sides of the bottom end of the third module, and a fifth control valve 131 and a sixth control valve 132 are arranged at the third outlet pipe orifice and the third inlet pipe orifice so as to control the outflow and inflow of the reclaimed water in the third module; an outflow control valve 210 and an inflow control valve 220 are arranged at two ends of the matched reservoir to control the outflow and inflow of water in the matched reservoir; each energy storage module comprises a container and a weight piston, the weight piston and the container are arranged in a clearance mode, and liquid can jack up the weight piston to store potential energy after entering the corresponding energy storage module.

In the initial state, the control valves in all the energy storage modules are in a closed state, the weight pistons in the first to third modules are not lifted, the containers of the three energy storage modules are not filled with liquid, and the liquid is in the matched reservoir.

When the electricity is used at a low valley, namely energy is required to be stored, the outflow control valve 210 is opened, the second control valve 112 is opened, the water pump in the driving device 500 starts to work, water in the matched reservoir 200 is pumped into the container of the first module through the pipeline system, and the weight piston in the first module is pushed to rise; after the weight piston in the first module ascends to the designated position, the clamping device of the first module acts to clamp the weight piston in the first module and support the weight piston not to fall, and potential energy is stored in the first module at the moment.

When the potential energy in the module II needs to be stored, the second control valve 112 is closed, the first control valve 111 is opened, the fourth control valve 122 is opened, liquid in the module I enters the module II through the first control valve 111, a water pump in the driving device and the fourth control valve 122, namely water in a container of the module I is pumped out through a water discharging pipeline controlled by the first control valve 111 and is injected from a water inlet pipeline controlled by the fourth control valve 122 of the module II through a pipeline system, and a solid weight piston in the module II is pushed to rise so as to store the potential energy in the module II; when the weight piston in the second module rises to the designated position, the clamping device in the second module acts to clamp the weight piston in the second module and support the weight piston not to fall down, and at the moment, the water in the first module is completely transferred to the second module.

When the potential energy in the module III needs to be stored, the first control valve 111 and the fourth control valve 122 are closed, the third control valve 121 and the sixth control valve 132 are opened, liquid in the module II enters the module III through the third control valve 121, a water pump in the driving device and the sixth control valve 132, namely water in a container of the module II is pumped out through a water drainage pipeline controlled by the third control valve 121 and is injected from a water inlet pipeline controlled by the sixth control valve 132 of the module III through a pipeline system, and a solid weight piston in the module III is pushed to ascend so as to store the potential energy in the module III; when the weight piston in the third module ascends to the designated position, the clamping device in the third module acts to clamp the weight piston in the third module and support the weight piston not to fall down, and at the moment, the water in the second module is completely transferred to the third module.

Taking three energy storage modules as an example, the fluid multiplexing energy storage system provided by the invention can realize the storage of potential energy which is three times of the water consumption of a single module, and the like, when the number of the energy storage modules is N, weight pistons in the N energy storage modules can be repeatedly pushed up through the water consumption of the single energy storage module.

It should be noted that, in this embodiment, a preferred embodiment is described, a sequence in which liquid pumped from a matching reservoir enters the plurality of energy storage modules is sequential circulation, the present embodiment does not limit the protection scope of the present invention, when liquid is reused, liquid may enter the third module from the matching reservoir first, after potential energy is stored in the third module, the liquid may be stored in the second module under the control of the driving device and the corresponding valve, and so on, so that storage of potential energy in the plurality of energy storage modules is achieved, and therefore, description is not repeated herein.

When the system is in a full potential energy storage state, the weight pistons in the three energy storage modules all rise to a set position height and are fixed through the corresponding clamping devices, and water is retained in the last rising module.

When the power is used, namely energy is required to be released, the fifth control valve 131 is opened, the fourth control valve 122 is opened, the clamping device in the third module is reset, the heavy piston in the third module falls under the action of self gravity, water in the container of the third module is extruded to be discharged through the fifth control valve 131, flows through the driving device through the pipeline system, flows into the container of the second module from the pipeline controlled by the fourth control valve 122, and drives the generator in the driving device to generate power for the first time through water flow; at this time, the weight piston in the third module completely falls down, and the water in the third module is completely extruded into the container of the second module.

When the second power generation is needed, the fifth control valve 131 and the fourth control valve 122 are closed, the third control valve 121 and the second control valve 112 are opened, the weight piston in the second module falls under the action of self gravity, water in the container of the second extrusion module is discharged through the third control valve 121, flows through the driving device through the pipeline system, flows into the container of the first module from the pipeline controlled by the second control valve 112, and drives the generator in the driving device to perform the second power generation through water flow; at the moment, the weight piston in the second module completely falls down, and the water in the second module is completely extruded into the container of the first module.

When the third power generation is needed, the third control valve 121 and the second control valve 112 are closed, the first control valve 111 and the inflow control valve 220 are opened, the weight piston in the first module falls under the action of self gravity, water in the container of the first extrusion module is discharged through the first control valve 111, flows through the driving device through the pipeline system, flows into the matched reservoir from the pipeline controlled by the inflow control valve 220, and drives the generator in the driving device to generate power for the third time through water flow; at the moment, the weight piston in the first module completely falls down, and water in the first module is completely extruded into a matched reservoir; at the moment, the weight pistons in the three energy storage modules all fall down completely, and the energy of the system is released completely.

It should be noted that, the most preferable scheme is described in this embodiment, a scheme of sequential energy storage or sequential power generation is used to facilitate energy storage or power supply at a certain time, and meanwhile, a flow scheme of a fluid in the whole pipeline system consumes the least energy and has the fastest time, and in addition, when all energy storage modules are not required to release potential energy at a certain time to generate power, taking three energy storage modules as an example, when the power generated by the potential energy released in the module three and the module two is sufficient to supply at a peak of power consumption, that is, when the potential energy in the module one is not required to generate power supply, the liquid in the module two may not flow into the module one, and may flow into the module three through the driving device to store the potential energy in the module three, so as to supply power at the next time, and so on, when the energy storage modules are multiple, the potential energy storage and power supply of the multiple energy storage modules may be flexibly adjusted and set according to actual situations, therefore, the description is not repeated herein.

Preferably, the drive means is a single pump/turbine unit with integrated functional multiplexing.

Further, the pipe system of the present invention can be implemented in various forms, such as a ring or U shape, as long as the communication between the containers of the respective modules and the water reservoir can be satisfied, and the ordered flow in the containers can be controlled by the valves, and the pipe arrangement scheme in this embodiment does not limit the protection scope of the present invention.

Further, referring to fig. 2, the schematic diagram is a schematic top view of another two specific embodiments of the fluid multiplexing energy storage system of the present invention, in this embodiment, the driving device includes a water pump 501 and a hydraulic generator 502, in the process of storing potential energy in the system, the water pump is started, and liquid is jacked up by the water pump corresponding to the weight piston in the energy storage module to store corresponding potential energy; in the power generation process, the hydraulic generator is started, and the weight piston in the corresponding energy storage module extrudes liquid under the action of self gravity to drive the hydraulic generator to generate power.

Further, referring to fig. 3, a schematic left-side cross-sectional view of a third embodiment of a module in a fluid reuse energy storage system according to the present invention is shown; the container in each energy storage module is arranged in an open manner, so that the weight piston can conveniently move up and down; an annular sealing assembly 300 is arranged between the weight piston and the container, and comprises an annular supporting device and an annular sealing device, wherein the annular sealing device is fixedly arranged on the inner wall of the container 140 through the annular supporting device; the annular sealing device is in interference fit with the weight piston 150; the annular sealing device always seals a cavity between the annular sealing device and the container in the lifting process of the weight piston, and the jacking force of liquid in the lifting process of the weight piston is ensured. The system also comprises a position clamping device 400 used for limiting and fixing the weight piston in a potential energy storage state; the clamping device is arranged between the weight piston and the container, is in a first state when the weight piston moves up and down, and clamps and bears the weight piston when the weight piston rises to a set position; the first state is a state which does not interfere with the movement of the weight piston; the set position is the position of the weight piston when topped up by a set amount of fluid.

Preferably, the annular sealing device comprises an annular supporting device and an annular sealing device, and the annular sealing device is fixedly arranged on the inner wall of the container through the annular supporting device; wherein, the annular sealing device is a 0-type piston sealing ring.

Preferably, the annular sealing device is a 0-type piston sealing ring, the 0-type piston sealing ring is arranged on the outer side wall of the weight piston, and the 0-type piston sealing ring always abuts against the inner side of the container, so that the storage of liquid below the annular sealing device is ensured.

Further, referring to fig. 4, fig. 5 and fig. 6, fig. 4 is a schematic structural diagram of an embodiment of a clamping device in the fluid reuse energy storage system according to the present invention, fig. 5 is a schematic partial structural diagram of an embodiment of the clamping device in fig. 4 in a non-operating state, and fig. 6 is a schematic partial structural diagram of an embodiment of the clamping device in fig. 4 in an operating state; the clamping device is arranged at the top end of the container; the clamping devices comprise a first clamping device 410 and a second clamping device 420, and the first clamping device and the second clamping device are arranged oppositely; a first arc-shaped bulge is arranged on the inner side of the first clamping device, and a second arc-shaped bulge is arranged on the inner side of the second clamping device; a first arc-shaped groove and a second arc-shaped groove are formed on the outer side of the weight piston 150; when the heavy piston ascends to the set position, the first clamping device and the second clamping device can move inwards under the driving of the clamping power device to drive the first arc-shaped bulge and the second arc-shaped bulge to be clamped with the first arc-shaped groove and the second arc-shaped groove respectively so as to fixedly bear the heavy piston.

Preferably, the first arc-shaped protrusion and the second arc-shaped protrusion are respectively a first semicircular caliper structure 413 and a second semicircular caliper structure 423; when the weight piston is in a rising fixed state, the first semicircular caliper structure, the second semicircular caliper structure and the weight piston form a concentric cylinder structure, and the limiting and fixing of the weight piston are guaranteed.

Furthermore, the clamping device further comprises a first fixing device 412 and a second fixing device 422, wherein the first fixing device and the second fixing device are respectively arranged at the end parts far away from the weight piston, and are respectively fixed with the first clamping device and the second clamping device, so that the tail part of the first clamping device and the tail part of the second clamping device are prevented from tilting when the weight piston is fixed.

Preferably, a first horizontal guide rail 411 and a second horizontal guide rail 421 are respectively arranged below the first semicircular caliper structure and the second semicircular caliper structure so as to respectively bear and move the corresponding caliper structures.

Furthermore, the inner side of the first semicircular caliper structure is provided with a caliper bulge, and the inner side of the second semicircular caliper structure is provided with a caliper groove clamped with the caliper bulge, so that the clamping effect of the clamping device in a working state is further improved; the caliper projection and the caliper groove can be multiple.

Further, referring to fig. 7, it is a schematic structural diagram of another embodiment of the clamping device in the fluid reuse energy storage system according to the present invention; the clamping devices comprise a first group of clamping devices and a second group of clamping devices, the first group of clamping devices and the second group of clamping devices are respectively arranged on a first side wall and a second side wall of the container, and the first side wall and the second side wall are opposite inner side walls; the first set of locking devices includes a plurality of first protrusions 414 disposed in parallel on the first sidewall; the first protrusion is arranged in a telescopic manner.

The second set of locking devices includes a plurality of second protrusions 424, which are disposed in parallel on the second sidewall; the second bulge is arranged in a telescopic manner; the side wall of the weight piston is provided with a plurality of first grooves matched with the first bulges and a plurality of second grooves matched with the second bulges; when the weight piston rises to a set position, the first bulges and the second bulges are driven by the clamping power device to extend inwards and are clamped and fixed with the first grooves and the second grooves respectively.

Further, the weight piston is also provided with a piston counterweight device for counterweight of the weight piston; the size of the stored energy can be adjusted through the additional counterweight, the heavy object of the additional counterweight can be concentrated in the middle, the weight is decreased towards the two ends in sequence, and the stability of the device is improved.

Furthermore, the fluid multiplexing energy storage system also comprises an anti-roll guide rail device, wherein the anti-roll guide rail device is arranged on the inner wall of the container and does not interfere with the annular sealing assembly; the anti-roll guide rail device comprises a support body, a spring telescopic rod and an elastic contact head, wherein the spring telescopic rod is fixedly arranged on the support body; the elastic contact head is arranged at the end part of the spring telescopic rod far away from the support body; the outer side of the weight piston is provided with a vertical guide groove capable of accommodating the elastic contact head, and the distance from the end part of the elastic contact head to the inner wall of the container is greater than the distance from the outer side of the weight piston to the inner wall of the container.

In the existing energy storage system, because the density of the solid weight piston cannot be increased without limit, when the energy storage capacity of the system needs to be increased, as can be known from the gravitational potential energy formula mgh ═ ρ Vgh, when ρ is constant, only V and h can be increased, and V and h are increased, which means that the volume of liquid needed to push and lift the solid weight piston needs to be increased, so that when a lake is not reached, a container with an extra volume needs to be excavated to store the liquid; the system is divided into N modules when the same stored energy of the gravitational potential energy mgh is obtained, the water consumption of the system is reduced by 1/N through the coordination control steps, the system is suitable for being popularized in water-deficient areas, the excavation cost of the system is obviously reduced, and the total cost limit and the geographic environment limit are further removed.

Furthermore, the invention can also pressurize through the air, replace the heavy object to carry on the storage of energy; at the moment, the container comprises an upper high-pressure gas chamber and a lower high-pressure gas chamber, a communication channel is arranged between the upper high-pressure gas chamber and the lower high-pressure gas chamber, and the communication channel is provided with an opening and closing device for controlling the communication or isolation of the lower high-pressure gas chamber and the upper high-pressure gas chamber; when the adjacent energy storage modules need to store energy, fluid flows into the energy storage modules from the fluid storage modules through the driving device, high-pressure gas in the lower high-pressure gas chamber in the corresponding energy storage module is extruded to the upper high-pressure gas chamber through the communication channel, the upper high-pressure gas chamber is sealed through the opening and closing device, so that the high-pressure gas is compressed and stored with energy, the embodiment is equal to the embodiment that the heavy piston is clamped in the middle of the air by adopting the clamping device, and liquid can circulate to sequentially push the gas in the lower chambers in different modules to enter the upper high-pressure gas chamber; the fluid in the stored energy storage module enters the next energy storage module through the driving device to store corresponding energy; when the power is used, the opening and closing device (namely the chamber valve) is opened, and the compressed high-pressure gas in the upper high-pressure gas chamber acts on the fluid in the lower high-pressure gas chamber through the communication channel to push the liquid to the next energy storage module and drive the generator to generate power at the same time.

Preferably, the diameter of the communication channel is smaller than the inner diameter of the container.

Furthermore, the matched water tank can be composed of a closed high-pressure-resistant container, the matched water tank is connected with the outside air through an expansion machine and a compressor, the compressor compresses the outside air to enter the reservoir container, and liquid in the reservoir container is pushed to flow to the corresponding energy storage module for energy storage; alternatively, liquid may be forced into the reservoir tank by other modules, and the forced air is vented through an expander while generating electricity.

While the invention has been described with reference to a preferred embodiment, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, especially if structural conflict does not exist and the technical features mentioned in the various embodiments may be combined in any way; it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.