阅读说明：本技术 一种流体飞轮储能系统 (Fluid flywheel energy storage system ) 是由 李琳 冯超 张铁柱 鲁力群 孟令菊 于 2021-07-12 设计创作，主要内容包括：本发明公开一种流体飞轮储能系统,包括飞轮电池组、流体动力系统、动力输出系统和调控系统,所述飞轮电池组的能量输入端连接有流体动力系统,所述飞轮电池组的能量输出端连接有动力输出系统,所述动力输出系统连接有流体负载,且所述动力输出系统与所述流体负载之间连接有调控系统。本发明提供的流体飞轮储能系统,可作为增压装置、辅助动力装置应用于中大型液压(气压)系统中,也可代替液压蓄能器或传统化学电池组,可实现长时间不间断供能。(The invention discloses a fluid flywheel energy storage system which comprises a flywheel battery pack, a fluid power system, a power output system and a regulation and control system, wherein the energy input end of the flywheel battery pack is connected with the fluid power system, the energy output end of the flywheel battery pack is connected with the power output system, the power output system is connected with a fluid load, and the regulation and control system is connected between the power output system and the fluid load. The fluid flywheel energy storage system provided by the invention can be used as a supercharging device and an auxiliary power device to be applied to a medium-large hydraulic (air pressure) system, can also replace a hydraulic energy accumulator or a traditional chemical battery pack, and can realize long-time uninterrupted energy supply.)

1. A fluid flywheel energy storage system, characterized by: the energy input end of the flywheel battery pack is connected with the fluid power system, the energy output end of the flywheel battery pack is connected with the power output system, the power output system is connected with a fluid load, and the regulation system is connected between the power output system and the fluid load.

2. The fluid flywheel energy storage system of claim 1, wherein: the flywheel battery pack comprises a shell, wherein a first gear is arranged in the shell, the two ends of the first gear are respectively meshed with a second gear and a third gear, a gear shaft of the second gear is connected with a first flywheel set through transmission of a first input end clutch, the tail end of the first flywheel set is connected with a fourth gear through transmission of a first output end clutch, a gear shaft of the third gear is connected with a second flywheel set through transmission of a second input end clutch, the tail end of the second flywheel set is connected with a fifth gear through transmission of a second output end clutch, the fourth gear and the fifth gear are respectively meshed with a sixth gear, the gear shaft of the first gear is in transmission connection with a fluid power system, and the gear shaft of the sixth gear is in transmission connection with a power output system.

3. The fluid flywheel energy storage system of claim 2, wherein: the first flywheel set and the second flywheel set are identical in structure, the first flywheel set comprises a plurality of flywheels which are connected in series through a first connecting shaft, the flywheels are connected with the first connecting shaft through mechanical bearings in a supporting mode, and two ends of the first connecting shaft are respectively in transmission connection with the first input end clutch and the first output end clutch; the second flywheel group comprises a plurality of flywheels connected in series through second connecting shafts, the flywheels are connected with the second connecting shafts through mechanical bearing supports, and two ends of each second connecting shaft are respectively in transmission connection with a second input end clutch and a second output end clutch.

4. The fluid flywheel energy storage system of claim 1, wherein: the fluid power system comprises a one-way variable motor in transmission connection with an energy input end of the flywheel battery pack, an oil inlet of the one-way variable motor is connected with a first one-way variable pump, an oil inlet of the first one-way variable pump is connected with a hydraulic oil tank, and an oil outlet of the one-way variable motor is connected with the hydraulic oil tank; the power output system comprises a second unidirectional variable pump connected with the energy output end of the flywheel battery pack, the oil inlet of the second unidirectional variable pump is connected with the hydraulic oil tank, and the oil outlet of the second unidirectional variable pump is connected with the fluid load; the first one-way variable pump is connected with a power source.

5. The fluid flywheel energy storage system of claim 4, wherein: the regulating and controlling system is a direct-acting internal control overflow valve, an oil outlet of the direct-acting internal control overflow valve is connected with the hydraulic oil tank, and an oil inlet of the direct-acting internal control overflow valve is connected between the second unidirectional variable pump and the fluid load.

6. The fluid flywheel energy storage system of claim 2, wherein: the radial size and the number of teeth of the first gear are larger than those of the second gear; the radial size and the number of teeth of the first gear and the sixth gear are the same, and the radial size and the number of teeth of the second gear, the third gear, the fourth gear and the fifth gear are the same.

7. The fluid flywheel energy storage system of claim 1, wherein: the fluid power system comprises an air motor in transmission connection with an energy input end of the flywheel battery pack, and the air motor is connected with a first air compressor; the power output system comprises a second air compressor connected with the energy output end of the flywheel battery pack, and the second air compressor is connected with the fluid load.

8. The fluid flywheel energy storage system of claim 7, wherein: the regulation system is a relief valve disposed between the power take-off system and the fluid load.

Technical Field

The invention relates to the technical field of flywheel energy storage systems, in particular to a fluid flywheel energy storage system.

Background

At present, the energy storage mode includes chemical energy storage, physical energy storage and other energy storage modes. In the physical energy storage mode, the flywheel has more outstanding energy storage characteristics, short charging time and high charging and discharging efficiency, and is widely concerned.

From the 90 s of the 20 th century to date, the development efforts of the global flywheel energy storage technology have mainly focused on the united states, europe, and japan. In the aspects of basic application research of flywheel technology, key technology and manufacturing process, industrial development and market operation of flywheel energy storage products and the like, the American and European dates are far ahead of other countries. With the gradual attention and great investment of other countries on energy storage technology, the trend of multi-polarization of flywheel energy storage research and development patterns is increasingly obvious. The research in the technical field of China starts late, and after the 21 st century, a large number of scientific research institutes with strong strength begin to conduct research and a flywheel energy storage system technology development company for commercial popularization and demonstration application appears in succession. Nowadays, the flywheel energy storage technology has been successfully applied to many fields such as high-quality Uninterruptible Power Supply (UPS), power grid frequency modulation, aerospace and military, and rail transit braking kinetic energy regeneration.

The flywheel energy storage system has the advantages of high instantaneous power, high energy storage density, high efficiency, long service life, environmental protection, no pollution and the like, but the flywheel energy storage system also has the defect that the energy can not be continuously supplied for a long time due to continuous energy loss and quick energy release, and the arrangement mode of the flywheel has higher requirements on the system space.

Disclosure of Invention

The invention aims to provide a fluid flywheel energy storage system, which can be used as a supercharging device and an auxiliary power device to be applied to a medium-large hydraulic (pneumatic) system, can also replace a hydraulic energy accumulator or a traditional chemical battery pack and can realize long-time uninterrupted energy supply so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a fluid flywheel energy storage system which comprises a flywheel battery pack, a fluid power system, a power output system and a regulation and control system, wherein the energy input end of the flywheel battery pack is connected with the fluid power system, the energy output end of the flywheel battery pack is connected with the power output system, the power output system is connected with a fluid load, and the regulation and control system is connected between the power output system and the fluid load.

Optionally, the flywheel battery pack comprises a shell, a first gear is arranged in the shell, a second gear and a third gear are respectively meshed at two ends of the first gear, a gear shaft of the second gear is connected with a first flywheel set through transmission of a first input end clutch, the tail end of the first flywheel set is connected with a fourth gear through transmission of a first output end clutch, a gear shaft of the third gear is connected with a second flywheel set through transmission of a second input end clutch, the tail end of the second flywheel set is connected with a fifth gear through transmission of a second output end clutch, the fourth gear and the fifth gear are respectively meshed with a sixth gear, the gear shaft of the first gear is in transmission connection with the fluid power system, and the gear shaft of the sixth gear is in transmission connection with the power output system.

Optionally, the first flywheel set and the second flywheel set have the same structure, the first flywheel set includes a plurality of flywheels connected in series by a first connecting shaft, the flywheels are supported and connected with the first connecting shaft by a mechanical bearing, and two ends of the first connecting shaft are respectively in transmission connection with the first input end clutch and the first output end clutch; the second flywheel group comprises a plurality of flywheels connected in series through second connecting shafts, the flywheels are connected with the second connecting shafts through mechanical bearing supports, and two ends of each second connecting shaft are respectively in transmission connection with a second input end clutch and a second output end clutch. The flywheel battery pack is structurally and generally arranged in a series-parallel connection mode, and the number and the size of the flywheels can be comprehensively determined according to system space and performance requirements.

Optionally, the fluid power system includes a single-direction variable motor in transmission connection with an energy input end of the flywheel battery pack, an oil inlet of the single-direction variable motor is connected with a first single-direction variable pump, an oil inlet of the first single-direction variable pump is connected with a hydraulic oil tank, and an oil outlet of the single-direction variable motor is connected with the hydraulic oil tank; the power output system comprises a second unidirectional variable pump connected with the energy output end of the flywheel battery pack, the oil inlet of the second unidirectional variable pump is connected with the hydraulic oil tank, and the oil outlet of the second unidirectional variable pump is connected with the fluid load; the first one-way variable pump is connected with a power source.

Optionally, the regulation and control system is a direct-acting internal control overflow valve, an oil outlet of the direct-acting internal control overflow valve is connected with the hydraulic oil tank, and an oil inlet of the direct-acting internal control overflow valve is connected between the second unidirectional variable pump and the fluid load.

Optionally, the radial size and the number of teeth of the first gear are larger than the radial size and the number of teeth of the second gear; the radial size and the number of teeth of the first gear and the sixth gear are the same, and the radial size and the number of teeth of the second gear, the third gear, the fourth gear and the fifth gear are the same; therefore, the effects of rapidly increasing the rotating speed of the flywheel at the energy input end and reducing and increasing the torque at the energy output end are achieved.

Optionally, the fluid power system comprises an air motor in transmission connection with an energy input end of the flywheel battery pack, and the air motor is connected with a first air compressor; the power output system comprises a second air compressor connected with the energy output end of the flywheel battery pack, and the second air compressor is connected with the fluid load.

Optionally, the regulation system is a relief valve disposed between the power take-off system and the fluid load.

Compared with the prior art, the invention has the following technical effects:

the flywheel battery pack realizes the conversion from fluid pressure energy to mechanical energy in the energy supply process, and the flywheel battery pack realizes the conversion from the mechanical energy to the fluid pressure energy in the energy discharge process. The unidirectional variable pump and the unidirectional variable motor can be respectively replaced by an air compressor and an air motor, so that the energy can be supplied to the flywheel battery pack by the pressure energy of compressed gas; similarly, the unidirectional variable pump can be replaced by an air compressor; the direct-acting internal control overflow valve can be replaced by a safety valve; therefore, the flywheel energy storage system provided by the present invention can be applied to a hydraulic power system, a pneumatic power system and a hydraulic-pneumatic hybrid power system, and is described in the following description by taking the hydraulic system as an example. The invention can realize long-time uninterrupted energy supply, can be used as a supercharging device and an auxiliary power device, is applied to medium and large hydraulic (pneumatic) systems, and can also replace a hydraulic accumulator or a traditional chemical battery pack.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a flywheel energy storage system according to the present invention;

FIG. 2 is a schematic view of the internal connection structure of the flywheel battery pack according to the present invention;

description of reference numerals: 100-fluid flywheel energy storage system, 1-hydraulic oil tank, 2-one-way variable motor, 3-flywheel battery pack, 4-fluid load, 5-direct-acting internal control overflow valve, 6-second one-way variable pump, 7-power source, 8-first one-way variable pump, 9-first gear, 10-second gear, 11-first input end clutch, 12-flywheel, 13-shell, 14-first output end clutch, 15-fourth gear, 16-mechanical bearing, 17-sixth gear, 18-fifth gear, 19-second output end clutch, 20-second input end clutch, and 21-third gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a fluid flywheel energy storage system, which can be used as a supercharging device and an auxiliary power device to be applied to a medium-large hydraulic (pneumatic) system, can also replace a hydraulic energy accumulator or a traditional chemical battery pack and can realize long-time uninterrupted energy supply so as to solve the problems in the prior art.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the present invention provides a fluid flywheel energy storage system 100, which comprises a hydraulic oil tank 1, a unidirectional variable motor 2, a flywheel battery pack 3, a fluid load 4, a direct-acting internal control overflow valve 5, a first unidirectional variable pump 8, a power source 7, and a second unidirectional variable pump 6. As shown in fig. 2, the flywheel battery 3 includes: the gear transmission mechanism comprises a first gear 9, a second gear 10, a third gear 21, a fourth gear 15, a fifth gear 18, a sixth gear 17, a first input end clutch 11, a second input end clutch 20, a first output end clutch 14, a second output end clutch 19, a flywheel 12, a mechanical bearing 16 and a shell 13.

An oil inlet of the first unidirectional variable pump 8 is connected with the hydraulic oil tank 1, an oil outlet of the first unidirectional variable pump is connected with an oil inlet of the unidirectional variable motor 2, and required power is provided by the power source 7; the oil outlet of the one-way variable motor 2 is connected with the hydraulic oil tank 1; the energy input end of the flywheel battery pack 3 is connected with the unidirectional variable motor 2, and the energy output end of the flywheel battery pack is connected with the second unidirectional variable pump 6; an oil inlet of the second one-way variable pump 6 is connected with the hydraulic oil tank 1, and an oil outlet of the second one-way variable pump is connected with the fluid load 4; an oil outlet of the direct-acting internal control overflow valve 5 is connected with the hydraulic oil tank 1, and an oil inlet is connected between the second one-way variable pump 6 and the fluid load 4.

In the flywheel battery pack 3, the first gear 9 is meshed with the second gear 10 and the third gear 21 at the same time, and the sixth gear 17 is meshed with the fourth gear 15 and the fifth gear 18 at the same time; the second gear 10, the third gear 21 and the flywheel 12 on the branch are respectively connected or disconnected through a first input end clutch 11 and a second input end clutch 20; similarly, the fourth gear 15, the fifth gear 18 and the flywheel 12 on the branch are respectively connected or disconnected through the first output end clutch 14 and the second output end clutch 19; the flywheels 12 of each branch are rigidly connected in series; each flywheel 12 is supported by mechanical bearings 16.

The specific implementation mode of the fluid flywheel energy storage system is as follows:

(1) the energy storage process is as follows: the power source 7 provides power for the first unidirectional variable pump 8, the first unidirectional variable pump is driven to suck oil from the hydraulic oil tank 1 and pump oil into the unidirectional variable motor 2, the unidirectional variable motor 2 converts hydraulic energy into mechanical energy, the mechanical energy is stored in the flywheel battery pack 3, and the oil passing through the unidirectional variable motor 2 flows back to the hydraulic oil tank 1 from an oil outlet of the unidirectional variable motor.

(2) The energy release process is as follows: the flywheel battery pack 3 releases energy to drive the second one-way variable pump 6 to work, and mechanical energy is converted into hydraulic energy in the process to supply energy to the fluid load 4.

(3) The unloading process is as follows: when the fluid load 4 is too large and exceeds the set value of the system, the direct-acting internal control overflow valve 5 is used for unloading so as to achieve the purpose of protecting the system.

In the flywheel battery pack 3, the radial sizes and the tooth numbers of the first gear 9 and the sixth gear 17 are larger than those of the second gear 10, the third gear 21, the fourth gear 15 and the fifth gear 18, so that the effects of rapidly increasing the flywheel rotating speed at an energy input end and reducing and increasing the torque at an energy output end are achieved. The flywheel battery pack 3 is shown in fig. 2, and the structure generally adopts a series-parallel connection structure, the energy input end and the energy output end adopt the same gear pair to transmit energy, and the number and the size of the flywheels 12 can be comprehensively determined according to the system space and the performance requirement.

The flywheel battery 3 is embodied as follows:

(1) the flywheel battery 3, in the course of the unidirectional variable motor 2 supplying energy to it, when the first input end clutch 11, the second input end clutch 20 is jointed at the same time, can improve the rotational speed of each flywheel of two branches at the same time, when the first input end clutch 11, the second input end clutch 20 is jointed alone, can accelerate for each branch flywheel alone, and the limit rotational speed of the flywheel of rigid connection is the same on two branches.

(2) The flywheel battery 3 can realize that the two branches release energy independently when the first output end clutch 14 and the second output end clutch 19 are engaged independently in the energy output process of the flywheel battery.

(3) When the two branches have the same flywheel rotation speed, the flywheel battery 3 can control the first output end clutch 14 and the second output end clutch 19 to be simultaneously engaged, so that the two branches simultaneously output energy outwards.

(4) When the two branch flywheels have different rotating speeds, the flywheel battery pack 3 can firstly control the output end clutch 14 or 19 of the branch with higher rotating speed to be engaged to release energy outwards, and when the rotating speed of the flywheel battery pack is reduced to be the same as that of the other branch, the output end clutch of the other branch is controlled to be engaged, and at the moment, the rotating speeds of the two branch flywheels are the same, and the energy can be simultaneously output outwards.

(5) When the fluid load of the system is small and energy needs to be supplied for a long time, the flywheel battery pack 3 can control the first output end clutch 14 or the second output end clutch 19 of one branch to be connected, so that the flywheel set of the branch can be independently discharged, the output end clutch of the other branch is disconnected, when the flywheel rotating speed of the discharging branch cannot meet the requirement of the working condition, the output clutch of the discharging branch is disconnected, the output end clutch of the other branch is connected, energy is continuously output, the power source 7 can be controlled to drive the first one-way variable pump 8, and the one-way variable motor 2 can be charged for the branch of the non-discharging working condition.

In another different embodiment, the first unidirectional variable pump 8 and the unidirectional variable motor 2 can be replaced by an air compressor and an air motor, respectively, so as to realize that the flywheel battery pack 3 is powered by the pressure energy of the compressed air; similarly, the second unidirectional variable pump 6 can be replaced by an air compressor; the direct-acting internal control overflow valve 5 can be replaced by a safety valve; therefore, the fluid flywheel energy storage system provided by the invention can be respectively applied to a hydraulic power system, a pneumatic power system and a hydraulic-pneumatic hybrid power system.

In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.