阅读说明：本技术 一种液压飞轮储能系统及工作方法 (Hydraulic flywheel energy storage system and working method ) 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：本发明公开了一种液压飞轮储能系统,涉及液压飞轮蓄能器技术领域,包括控制器、工作装置液压缸和飞轮,飞轮连接有离合器,离合器连接有第一液压元件,第一液压元件连接有第一阀门以及油箱；第一阀门还连接有第二液压元件的出油口,第二液压元件的进油口连接有油箱；第一阀门通过无杆腔管路和有杆腔管路分别与工作装置液压缸的无杆腔和有杆腔连接,无杆腔管路和有杆腔管路之间通过第二阀门进行连接；第二阀门与工作装置液压缸之间的有杆腔管路上还连接有第三阀门和第四阀门,第四阀门连接有油箱。本发明还公开一种液压飞轮储能系统的工作方法。本发明能够实现液压系统能量的高效回收与释放。(The invention discloses a hydraulic flywheel energy storage system, which relates to the technical field of hydraulic flywheel energy accumulators and comprises a controller, a working device hydraulic cylinder and a flywheel, wherein the flywheel is connected with a clutch, the clutch is connected with a first hydraulic element, and the first hydraulic element is connected with a first valve and an oil tank; the first valve is also connected with an oil outlet of a second hydraulic element, and an oil inlet of the second hydraulic element is connected with an oil tank; the first valve is respectively connected with a rodless cavity and a rod cavity of a hydraulic cylinder of the working device through a rodless cavity pipeline and a rod cavity pipeline, and the rodless cavity pipeline and the rod cavity pipeline are connected through a second valve; and a rod cavity pipeline between the second valve and the hydraulic cylinder of the working device is also connected with a third valve and a fourth valve, and the fourth valve is connected with an oil tank. The invention also discloses a working method of the hydraulic flywheel energy storage system. The invention can realize the high-efficiency recovery and release of the energy of the hydraulic system.)

1. A hydraulic pressure flywheel energy storage system which characterized in that: the hydraulic control system comprises a controller, a working device hydraulic cylinder and a flywheel, wherein the flywheel is connected with a clutch, the clutch is connected with a first hydraulic element, and the first hydraulic element is connected with a first valve and an oil tank; the first valve is also connected with an oil outlet of a second hydraulic element, and an oil inlet of the second hydraulic element is connected with an oil tank; the first valve is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder of the working device through a rodless cavity pipeline and a rod cavity pipeline, and the rodless cavity pipeline and the rod cavity pipeline are connected through a second valve; a third valve and a fourth valve are further connected to the rod cavity pipeline between the second valve and the hydraulic cylinder of the working device, and the fourth valve is connected with an oil tank; the clutch, the first hydraulic component, the second hydraulic component and the working device hydraulic cylinder are all connected with the controller.

2. The hydraulic flywheel energy storage system of claim 1, wherein: the first hydraulic component adopts a bidirectional variable pump/motor.

3. The hydraulic flywheel energy storage system of claim 1, wherein: the flywheel is connected with a rotating speed sensor.

4. The hydraulic flywheel energy storage system of claim 1, wherein: the second hydraulic component adopts a hydraulic pump which is connected with a power source.

5. The hydraulic flywheel energy storage system of claim 4, wherein: the oil outlet of the hydraulic pump is also connected with an oil tank through an overflow valve.

6. The hydraulic flywheel energy storage system of claim 1, wherein: the first valve is a three-position four-way valve, and the second valve, the third valve and the fourth valve are two-position two-way valves.

7. The hydraulic flywheel energy storage system of claim 6, wherein: the first valve, the second valve, the third valve and the fourth valve are respectively controlled by a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all connected with the controller.

8. A method of operating a hydraulic flywheel energy storage system as claimed in claim 1, wherein: the method comprises the following four modes:

1) energy recovery mode:

the controller receives a signal and controls the first valve to act, the first valve is positioned at a left position, the second valve and the fourth valve are positioned at a stop position, and the third valve is positioned at a conducting position; the working rod of the hydraulic cylinder of the working device moves leftwards under the action of load and self weight, and the second hydraulic element starts to pump oil to be used as rod cavity oil of the hydraulic cylinder of the working device for compensation; hydraulic oil enters a rod cavity of the working device hydraulic cylinder through the first valve, a working rod of the working device hydraulic cylinder is pushed to move leftwards, the hydraulic oil in a rodless cavity of the working device hydraulic cylinder flows into the first hydraulic element through the first valve at the moment, and the clutch is combined to drive the flywheel to rotate so as to store energy;

2) energy release mode:

the flywheel is preferentially used for energy release, when a working rod of the working device hydraulic cylinder moves rightwards, the controller controls the clutch to be combined, the first valve acts and is located at the right position, the second valve and the fourth valve are located at the conducting position, and the third valve is located at the stopping position; at the moment, the flywheel drives the first hydraulic element to pump oil from an oil tank through the clutch, hydraulic oil enters the conducted second valve through the first valve and then flows into a rodless cavity of the hydraulic cylinder of the working device to push a working rod of the hydraulic cylinder of the working device to move rightwards, and hydraulic oil in a rod cavity of the hydraulic cylinder of the working device flows back to the oil tank through the fourth valve;

when the demand pressure of the working device hydraulic cylinder is larger than the maximum pressure which can be provided by the flywheel, starting a compensation route: the second hydraulic component pumps oil from an oil tank, the oil enters the rodless cavity of the hydraulic cylinder of the working device through the first valve, and is converged with hydraulic oil entering the rodless cavity of the hydraulic cylinder of the working device through the first hydraulic component, the first valve and the second valve to jointly push the working rod of the hydraulic cylinder of the working device to move right;

3) pressure maintenance mode:

in the pressure maintaining mode, the working rod of the hydraulic cylinder of the working device is required to be kept static at a specified position, at the moment, the controller controls the first valve to be in a middle position state, oil in a rod cavity and a rodless cavity of the hydraulic cylinder of the working device cannot flow, and the pressure is kept stable;

4) hydraulic source abnormal mode:

and under the hydraulic source abnormal mode, the second hydraulic element is suddenly abnormal and can not pump oil, after the controller receives a working abnormal signal of the second hydraulic element, the clutch is controlled to be combined in order to keep the system pressure stable, the second valve is connected, the flywheel drives the first hydraulic element to pump oil from an oil tank through the clutch, and hydraulic oil simultaneously supplies oil to a rod cavity and a rodless cavity of the hydraulic cylinder of the working device through the first valve, the second valve and the third valve so as to keep the pressures of the rod cavity and the rodless cavity of the hydraulic cylinder of the working device equal and keep the pressure stable.

9. The method of operating a hydraulic flywheel energy storage system of claim 8: characterized in that, in the energy recovery mode, when the rotation speed of the flywheel reaches a set value, the clutch is disengaged under the control of the controller.

10. The method of operating a hydraulic flywheel energy storage system of claim 8: the hydraulic source abnormality mode is characterized in that in the hydraulic source abnormality mode, the first valve is shut off, so that hydraulic oil in the rod chamber and the rodless chamber of the hydraulic cylinder of the working device cannot flow, and the working rod of the hydraulic cylinder of the working device is prevented from moving rapidly.

Technical Field

The invention relates to the technical field of hydraulic flywheel energy accumulators, in particular to a hydraulic flywheel energy storage system and a working method.

Background

The hydraulic accumulator is a commonly used energy storage device in a hydraulic system, can convert energy in the system into compression energy for storage, and can release hydraulic energy for the system to use when the system needs.

However, the energy density of an energy accumulator in the existing hydraulic system is low, and the instantaneous high power and large torque input and output of the system are difficult to meet in the hydraulic system with large pressure fluctuation or high energy storage requirement; in order to meet the working requirements, a plurality of large-volume energy accumulators are usually required to supply energy together, the working space is seriously reduced, and the total weight of the system is increased.

For the occasions with higher power density requirements, a hydraulic accumulator, a flywheel and a super capacitor are preferred. However, the cost of the super capacitor is high, the technology is immature, and the wide application of the super capacitor is limited to a certain extent; the flywheel has high energy density and power density, and is used as an energy storage device and very suitable for medium and large hydraulic systems.

Therefore, the hydraulic flywheel energy storage system is provided by combining the existing hydraulic power and hydraulic energy storage device technologies and applying the flywheel energy storage system.

Disclosure of Invention

The invention aims to provide a hydraulic flywheel energy storage system and a working method thereof, which are used for solving the problems in the prior art and realizing the efficient recovery and release of energy of a hydraulic system.

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

the invention provides a hydraulic flywheel energy storage system which comprises a controller, a working device hydraulic cylinder and a flywheel, wherein the flywheel is connected with a clutch, the clutch is connected with a first hydraulic element, and the first hydraulic element is connected with a first valve and an oil tank; the first valve is also connected with an oil outlet of a second hydraulic element, and an oil inlet of the second hydraulic element is connected with an oil tank; the first valve is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder of the working device through a rodless cavity pipeline and a rod cavity pipeline, and the rodless cavity pipeline and the rod cavity pipeline are connected through a second valve; a third valve and a fourth valve are further connected to the rod cavity pipeline between the second valve and the hydraulic cylinder of the working device, and the fourth valve is connected with an oil tank; the clutch, the first hydraulic component, the second hydraulic component and the working device hydraulic cylinder are all connected with the controller.

Preferably, the first hydraulic component is a bidirectional variable pump/motor.

Preferably, a rotation speed sensor is connected to the flywheel.

Preferably, the second hydraulic component adopts a hydraulic pump, and the hydraulic pump is connected with a power source.

Preferably, the oil outlet of the hydraulic pump is further connected with an oil tank through an overflow valve.

Preferably, the first valve is a three-position four-way valve, and the second valve, the third valve and the fourth valve are two-position two-way valves.

Preferably, the first valve, the second valve, the third valve and the fourth valve are respectively controlled by a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all connected with the controller.

The invention also discloses a working method of the hydraulic flywheel energy storage system, which comprises the following four modes:

1) energy recovery mode:

the controller receives a signal and controls the first valve to act, the first valve is positioned at a left position, the second valve and the fourth valve are positioned at a stop position, and the third valve is positioned at a conducting position; the working rod of the hydraulic cylinder of the working device moves leftwards under the action of load and self weight, and the second hydraulic element starts to pump oil to be used as rod cavity oil of the hydraulic cylinder of the working device for compensation; hydraulic oil enters a rod cavity of the working device hydraulic cylinder through the first valve, a working rod of the working device hydraulic cylinder is pushed to move leftwards, the hydraulic oil in a rodless cavity of the working device hydraulic cylinder flows into the first hydraulic element through the first valve at the moment, and the clutch is combined to drive the flywheel to rotate so as to store energy;

2) energy release mode:

the flywheel is preferentially used for energy release, when a working rod of the working device hydraulic cylinder moves rightwards, the controller controls the clutch to be combined, the first valve acts and is located at the right position, the second valve and the fourth valve are located at the conducting position, and the third valve is located at the stopping position; at the moment, the flywheel drives the first hydraulic element to pump oil from an oil tank through the clutch, hydraulic oil enters the conducted second valve through the first valve and then flows into a rodless cavity of the hydraulic cylinder of the working device to push a working rod of the hydraulic cylinder of the working device to move rightwards, and hydraulic oil in a rod cavity of the hydraulic cylinder of the working device flows back to the oil tank through the fourth valve;

when the demand pressure of the working device hydraulic cylinder is larger than the maximum pressure which can be provided by the flywheel, starting a compensation route: the second hydraulic component pumps oil from an oil tank, the oil enters the rodless cavity of the hydraulic cylinder of the working device through the first valve, and is converged with hydraulic oil entering the rodless cavity of the hydraulic cylinder of the working device through the first hydraulic component, the first valve and the second valve to jointly push the working rod of the hydraulic cylinder of the working device to move right;

3) pressure maintenance mode:

in the pressure maintaining mode, the working rod of the hydraulic cylinder of the working device is required to be kept static at a specified position, at the moment, the controller controls the first valve to be in a middle position state, oil in a rod cavity and a rodless cavity of the hydraulic cylinder of the working device cannot flow, and the pressure is kept stable;

4) hydraulic source abnormal mode:

and under the hydraulic source abnormal mode, the second hydraulic element is suddenly abnormal and can not pump oil, after the controller receives a working abnormal signal of the second hydraulic element, the clutch is controlled to be combined in order to keep the system pressure stable, the second valve is connected, the flywheel drives the first hydraulic element to pump oil from an oil tank through the clutch, and hydraulic oil simultaneously supplies oil to a rod cavity and a rodless cavity of the hydraulic cylinder of the working device through the first valve, the second valve and the third valve so as to keep the pressures of the rod cavity and the rodless cavity of the hydraulic cylinder of the working device equal and keep the pressure stable.

Preferably, in the energy recovery mode, when the rotation speed of the flywheel reaches a set value, the clutch is disengaged under the control of the controller.

Preferably, in the abnormal mode of the hydraulic source, the first valve may be cut off to prevent the hydraulic oil in the rod chamber and the rodless chamber of the hydraulic cylinder of the working device from flowing, thereby preventing the working rod of the hydraulic cylinder of the working device from moving rapidly.

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

according to the hydraulic flywheel energy storage system and the working method, the flywheel can replace an energy accumulator to replace energy storage elements such as a chemical battery and a super capacitor, and the hydraulic energy in the system is temporarily stored and released by utilizing the advantages of instantaneous high power and large torque input and output when the flywheel rotates at a high speed; the flywheel can charge and discharge energy instantaneously, has high response speed and small energy loss, and can effectively improve the energy utilization rate; the system can realize efficient energy recovery and release of the system by controlling the flow change of the valve and the pump through the controller under the condition of ensuring the normal working condition of the hydraulic system, and can still maintain stable working when the system is abnormal.

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 hydraulic flywheel energy storage system according to the present invention;

FIG. 2 is a system energy conversion flow chart of the hydraulic flywheel energy storage system according to the present invention;

in the figure: 1-a controller, 2-a first hydraulic component, 3-a first electromagnetic valve, 4-a first valve, 5-a working device hydraulic cylinder, 6-a second valve, 7-an overflow valve, 8-a power source, 9-an oil tank, 10-a second hydraulic component, 11-a flywheel, 12-a rotating speed sensor, 13-a clutch, 14-a third valve, 15-a fourth valve, 16-a second electromagnetic valve, 17-a third electromagnetic valve and 18-a fourth electromagnetic valve.

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 hydraulic flywheel energy storage system and a working method thereof, which are used for solving the problems in the prior art and realizing the efficient recovery and release of the energy of a hydraulic system.

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. 1-2, the embodiment provides a hydraulic flywheel energy storage system, which is improved on the basis of a conventional hydraulic system, uses a flywheel 11 as an energy storage device to replace a conventional energy storage element, and temporarily stores hydraulic energy in the system by using the advantages of instantaneous high power and large torque input and output when the flywheel 11 rotates at a high speed, thereby effectively improving the energy utilization rate;

the hydraulic flywheel energy storage system comprises a controller 1, a working device hydraulic cylinder 5 and a flywheel 11, wherein the flywheel 11 is connected with a clutch 13, the clutch 13 is connected with a first hydraulic element 2, and the first hydraulic element 2 is connected with a first valve 4 and an oil tank 9; the first valve 4 is also connected with an oil outlet of a second hydraulic element 10, and an oil inlet of the second hydraulic element 10 is connected with an oil tank 9; the first valve 4 is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder 5 of the working device through a rodless cavity pipeline and a rod cavity pipeline, and the rodless cavity pipeline and the rod cavity pipeline are connected through a second valve 6; a rod cavity pipeline between the second valve 6 and the working device hydraulic cylinder 5 is also connected with a third valve 14 and a fourth valve 15, and the fourth valve 15 is connected with an oil tank 9; the clutch 13, the first hydraulic component 2, the second hydraulic component 10 and the working device hydraulic cylinder 5 are all connected with the controller 1, and signals are collected and command signals are transmitted through the controller 1 to enable each execution component to act.

In the embodiment, the first hydraulic component 2 adopts a bidirectional variable pump/motor, the second hydraulic component 10 adopts a hydraulic pump, and the hydraulic pump is connected with a power source; the controller 1 controls the work of the first hydraulic component 2 and the second hydraulic component 10 to provide the required hydraulic energy for the system; the controller 1 controls the engagement or disengagement of the clutch 13, thereby achieving the engagement or disengagement of the flywheel 11 with the first hydraulic element 2, the interconversion of hydraulic energy and mechanical energy, and the recovery and release of excess energy.

In this embodiment, a rotation speed sensor is connected to the flywheel.

In the embodiment, the oil outlet of the second hydraulic element 10 is further connected with an oil tank 9 through an overflow valve 7, and when the rodless cavity hydraulic pressure and the volume of the hydraulic cylinder 5 of the working device meet the working requirement and the pressure exceeds the preset pressure value of the overflow valve 7, the redundant hydraulic oil flows back to the oil tank 9 through the overflow valve 7; the first hydraulic element 2, the second hydraulic element 10, the fourth valve 15, and the relief valve 7 share the same tank 9.

In this embodiment, the first valve 4 is a three-position four-way valve, the second valve 6, the third valve 14 and the fourth valve 15 are two-position two-way valves, the first valve 4, the second valve 6, the third valve 14 and the fourth valve 15 are respectively controlled by the first electromagnetic valve 3, the second electromagnetic valve 16, the third electromagnetic valve 17 and the fourth electromagnetic valve 18, the first electromagnetic valve 3, the second electromagnetic valve 16, the third electromagnetic valve 17 and the fourth electromagnetic valve are all connected with the controller, and the controller 1 controls the first electromagnetic valve 3, the second electromagnetic valve 16, the third electromagnetic valve 17 and the fourth electromagnetic valve 18 to control the working states of the first valve 4, the second valve 6, the third valve 14 and the fourth valve 15, so as to change the hydraulic oil flow path, thereby realizing the switching of the system working modes.

The energy transmission path in the embodiment comprises an energy supply path, an energy recovery path and a pressure abnormal path; energy supply path 1: a power source 8, a second hydraulic component 10, a first valve 4 and a rodless cavity of a working device hydraulic cylinder 5; energy supply path 2: a flywheel 11, a clutch 13, a first hydraulic component 2, a first valve 4, a second valve 6 and a rodless cavity of a working device hydraulic cylinder 5; an energy recovery path: a rodless cavity of a hydraulic cylinder 5 of the working device, a first valve 4, a first hydraulic element 2, a clutch 13 and a flywheel 11; pressure anomaly path: the flywheel 11, the clutch 13, the first hydraulic component 2, the first valve 4, the rodless chamber from the second valve 6 into the working device cylinder 5, and the rod chamber from the third valve 14 into the working device cylinder 5, respectively.

The embodiment also discloses a working method of the hydraulic flywheel energy storage system, which comprises the following four modes:

1) energy recovery mode: when the controller 1 receives a signal, the first electromagnetic valve 3 of the first valve 4 is controlled to act, at the moment, the working position of the first valve 4 is a left cavity, the second valve 6 and the fourth valve 15 are at a stop position, and the third valve 14 is at a conducting position; the working rod of the hydraulic cylinder 5 of the working device moves leftwards under the load and the self rod weight; as the oil compensation of the rod cavity of the hydraulic cylinder 5 of the working device, the power source 8 drives the second hydraulic element 10 to pump oil and simultaneously pushes the working rod to move leftwards; the hydraulic oil enters a rod cavity of the working device hydraulic cylinder 5 through the first valve 4 to push the working rod to move leftwards, the hydraulic oil in a rodless cavity of the working device hydraulic cylinder 5 flows into the first hydraulic component 2 through a left cavity of the first valve 4, the first hydraulic component 2 works under the working condition of a motor at the moment, the clutch 13 is combined to drive the flywheel 11 to rotate so as to store energy, and when the rotating speed of the flywheel 11 reaches a set value, the clutch 13 is separated under the control of the controller 1.

2) Energy release mode: the flywheel 11 is preferentially used for energy release; when the working rod of the working device hydraulic cylinder 5 moves rightwards, the controller 1 controls the clutch 13 to be combined, the first valve 4 is located at the right position, the second valve 6 and the fourth valve 15 are located at the conducting position, and the third valve 14 is located at the stopping position; at the moment, the flywheel 11 drives the first hydraulic component 2 to rotate through the clutch 13, the first hydraulic component 2 pumps oil from the oil tank, and when the pump works, the hydraulic oil enters the conducted second valve 6 through the right cavity of the first valve 4 and then flows into the rodless cavity of the hydraulic cylinder 5 of the working device to push the working rod to move rightwards, and the hydraulic oil in the rod cavity flows back to the hydraulic oil tank through the fourth valve 15; when the demand pressure of the working device hydraulic cylinder 5 is greater than the maximum pressure that can be provided by the flywheel 11, the compensation route is initiated: the second hydraulic component 10 pumps oil from the oil tank 9, enters the rodless cavity of the working device hydraulic cylinder 5 through the first valve 4, joins with the hydraulic oil that enters the rodless cavity of the working device hydraulic cylinder 5 through the first hydraulic component 2, the first valve 4 and the second valve 6, and pushes the working rod of the working device hydraulic cylinder 5 to move right together.

3) Pressure maintenance mode: in the mode, the working rod of the hydraulic cylinder 5 of the working device is required to be kept static at a certain position, at the moment, the controller 1 controls the first electromagnetic valve 3 to act, so that the first valve 4 is in a middle position state, oil in a rod cavity and oil in a rodless cavity cannot flow, and the pressure is kept stable.

4) Hydraulic source abnormal mode: in this mode, the second hydraulic component 10 can not pump oil suddenly and abnormally, after the controller 1 receives the working abnormal signal of the second hydraulic component 10, in order to keep the system pressure stable, the clutch 13 is controlled to be combined, the second valve 6 and the third valve 14 are communicated, the flywheel 11 drives the first hydraulic component 2 to rotate through the clutch 13, the first hydraulic component 2 works in a pump working condition, hydraulic oil simultaneously supplies oil to the rod cavity and the rodless cavity of the hydraulic cylinder 5 of the working device through the left cavity of the first valve 4 and the communicated second valve 6 and third valve 14, so as to keep the pressures of the two cavities equal, and the system is kept stable; in addition, the first electromagnetic valve 3 of the first valve 4 can be rapidly controlled to cut off the first valve 4, so that the hydraulic oil in the two cavities of the hydraulic cylinder 5 of the working device can not flow, and the accident caused by rapid movement of the working rod due to rapid reduction of the hydraulic pressure of one cavity can be prevented.

The principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding 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 summary, this summary should not be construed to limit the present invention.