CN111536086B

CN111536086B - Electromagnetic auxiliary leather bag type constant-pressure energy accumulator

Info

Publication number: CN111536086B
Application number: CN202010417384.2A
Authority: CN
Inventors: 马浩钦; 高有山; 鲍东杰; 左旸; 秦泽; 王恺
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-10-29
Anticipated expiration: 2040-05-18
Also published as: CN111536086A

Abstract

The invention relates to an electromagnetic auxiliary leather bag type constant-pressure energy accumulator, and aims to solve the technical problems that the traditional air bag type energy accumulator is difficult to charge oil in the later stage of oil charging of hydraulic oil, partial energy cannot be stored, the power is weakened in the later stage of oil discharging, and the overall working performance of a hydraulic system is influenced. The energy accumulator comprises a shell, an elastic leather bag arranged in the shell, an end cover arranged at the bottom of the shell and an air valve seat arranged at the top of the shell; the permanent magnet motor also comprises a permanent magnet module, four coil winding columns, two leads and a numerical control power supply connected with the leads; the permanent magnet module is arranged at the bottom of the elastic leather bag in a built-in mode, the four coil winding columns are arranged on the outer wall of the shell, and two ends of each lead are wound on the two coil winding columns on different sides in a counterclockwise and clockwise mode respectively. The accumulator can ensure the stability of output oil pressure in the working process, improve the oil charging and discharging efficiency and the energy recovery efficiency of the accumulator, and improve the working performance of a hydraulic system.

Description

Electromagnetic auxiliary leather bag type constant-pressure energy accumulator

Technical Field

The invention belongs to the technical field of hydraulic transmission control technology and energy storage, and particularly relates to an electromagnetic auxiliary leather bag type constant-pressure energy accumulator.

Background

An accumulator is an energy storage device which can store oil with certain pressure energy in a pressure-resistant container and release the oil when needed. The accumulator is used as an important auxiliary part in the hydraulic system, and plays a vital role in ensuring the normal operation of the hydraulic system, improving the dynamic quality of the hydraulic system, maintaining the working stability, prolonging the working life of equipment, assisting energy sources, reducing noise and the like.

The energy accumulator can be divided into spring type, gravity type and gas-filled type according to the loading mode. Spring and gravity type accumulators are rarely used at present because of their limitations, and are widely used at present. The inflatable accumulator takes Boyle's law as a theoretical basis, and utilizes the compressible property of gas to convert and store the pressure energy of the hydraulic oil.

However, in the traditional inflatable energy accumulator, in the later stage of hydraulic oil filling, oil filling is difficult due to the rise of the pressure of an oil cavity, so that part of energy cannot be stored in the energy accumulator; in the later stage of oil discharge, the pressure of the air cavity is reduced, so that the pressure of discharged oil is reduced, and the power is weakened. Particularly, when the oil discharge pressure of the energy accumulator is lower than the system pressure, the energy accumulator cannot continuously output pressure oil outwards, so that the overall energy storage density is low, and the overall working performance of the hydraulic system is affected.

Disclosure of Invention

Aiming at the problems, the invention provides an electromagnetic auxiliary leather bag type constant-pressure energy accumulator which can ensure the stability of output oil pressure in the working process, improve the oil liquid charging and discharging efficiency and the energy recovery efficiency of the energy accumulator and improve the working performance of a hydraulic system.

In order to solve the technical problems, the invention adopts the technical scheme that:

an electromagnetic auxiliary leather bag type constant-pressure energy accumulator comprises a shell, an elastic leather bag arranged in the shell, an end cover arranged at the bottom of the shell and an air valve seat arranged at the top of the shell; the elastic body leather bag divides the shell into an air cavity and a liquid cavity, an inflation valve communicated with the air cavity is mounted on the air valve seat, and an oil side connector communicated with the liquid cavity is arranged on the end cover;

the permanent magnet motor also comprises a permanent magnet module, four coil winding columns, two leads and a numerical control power supply connected with the leads; the permanent magnet module is arranged at the bottom of the elastic leather bag in a built-in mode, the four coil winding columns are arranged on the outer wall of the shell, two coil winding columns are located on one side of the shell, the other two coil winding columns are located on the other side of the shell, and two ends of each conducting wire are wound on the two coil winding columns located on different sides in a counterclockwise and clockwise mode respectively.

Furthermore, pressure sensors are arranged in the air cavity and the liquid cavity, a displacement sensor is arranged on the permanent magnet module, and a Hall element is arranged on the lead.

Furthermore, the system also comprises a control system, wherein the control system comprises a PC, a DSP, a simulator, a plurality of conversion modules and a plurality of A/Ds; output signals of the pressure sensor, the displacement sensor and the Hall element enter A/D after being converted by the conversion module, the output signals are converted into digital signals through the A/D and then are transmitted to the DSP, the output end of the DSP is connected with the input end of the PC through the conversion module, the output end of the PC is connected with the input end of the DSP through the simulator, and the output end of the DSP is connected with the numerical control power supply through the conversion module.

Furthermore, the permanent magnet module is composed of four semicircular permanent magnets with the same magnetism in pairs, every two permanent magnets with different magnetism form a circular magnetic block in one group, and the two circular magnetic blocks are overlapped up and down according to positions with different magnetism to form the permanent magnet module.

Furthermore, the upper end face and the lower end face of the permanent magnet are of cambered surface structures.

Furthermore, the upper end face of the end cover is of an arc-shaped structure, and the radian of the arc-shaped structure is the same as that of the permanent magnet.

Furthermore, an air valve protective cover is arranged outside the inflation valve and connected with an air valve seat.

Further, the outside of the shell is provided with a coil protective sleeve.

Furthermore, the air valve seat is fixed at the upper end of the shell through a stop nut, and a sealing ring is arranged between the lower end of the air valve seat and the inner wall of the upper end of the shell.

Further, the upper end of the shell is provided with a technical indication sleeve.

The invention has the beneficial effects that:

1. the accumulator can continuously output constant pressure oil within a certain numerical range. Based on the principle of electromagnetism, the conducting wire in the electrified state is utilized to generate an alternating magnetic field to push the permanent magnet module to move. By changing the size of the magnetic field and the gas capacity in the elastic leather bag, the motion state of the permanent magnet module can be changed, and the effect of outputting constant-pressure oil by the energy accumulator is realized.

2. The moving position of the permanent magnet module in the invention is artificially controllable. In the oil drainage process of the energy accumulator, the position of the permanent magnet module can be controlled, so that the outer surface of the elastic leather bag wrapped outside the permanent magnet module is attached to the upper end face of the bottom end cover of the energy accumulator, and the effective volume of the energy accumulator is increased. In the process of charging oil into the energy accumulator, the position information of the permanent magnet module is mastered, so that the permanent magnet module can be prevented from excessively extruding the elastic body leather bag, and the problem of overhigh gas pressure in the elastic body leather bag is solved, thereby prolonging the service life of the elastic body leather bag and improving the safety of equipment.

3. The invention can convert hydraulic energy into gas pressure energy and electric energy, and improve energy recovery efficiency. In the oil charging process of the energy accumulator, the permanent magnet module wrapped in the elastic body leather bag can generate induced electromotive force in a closed circuit formed by the conducting wires based on the principle of physical electromagnetic induction so as to recover electric energy. The compressed elastic leather bag can convert the hydraulic energy into the pressure energy of the gas in the air cavity.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 5 is a schematic structural view of a permanent magnet module of the present invention;

FIG. 6 is a schematic view of the principle of movement of the permanent magnet module of the present invention;

FIG. 7 is a schematic diagram of the control system of the present invention.

In the figure: 1-gas valve protective cover, 2-gas charging valve, 2.1-gas valve sealing cap, 2.2-gas valve core, 2.3-sealing washer, 2.4-gas charging valve body, 3-gas valve seat, 4-stop nut, 5-technical indicating sleeve, 6-sealing washer, 7-shell, 8-elastomer leather bag, 9-gas cavity, 10-coil protective sleeve, 11-lead, 12.1, 12.2, 12.3, 12.4-coil winding column, 13-permanent magnet module, 13.1-permanent magnet S, 13.2-permanent magnet N, 13.3-permanent magnet N, 13.4-permanent magnet S, 14-liquid cavity, 15-O type sealing ring, 16-gasket, 17-thread ring, 18-screw, 19-oil side interface and 20-end cover.

Detailed Description

The invention is further described below with reference to examples and figures.

As shown in fig. 1 and fig. 2, the electromagnetic auxiliary bladder type constant pressure accumulator of the present embodiment includes a housing 7, an elastic body bladder 8 disposed in the housing 7, an end cap 20 disposed at the bottom of the housing 7, and a valve seat 3 disposed at the top of the housing 7; the air valve seat 3 is fixed at the upper end of the shell 7 through a stop nut 4, and a sealing ring 6 is arranged between the lower end of the air valve seat 3 and the inner wall of the upper end of the shell 7, so that the sealing effect can be achieved.

The elastic body leather bag 8 divides the interior of the shell 7 into an air cavity 9 and a liquid cavity 14, an inflation valve 2 communicated with the air cavity 9 is installed on the air valve seat 3, the inflation valve 2 is connected with the air valve seat 3 through threads, and the elastic body leather bag 8 is inflated through the inflation valve 2.

The inflation valve 2 comprises an air valve sealing cap 2.1, an air valve core 2.2, a sealing washer 2.3 and an inflation valve body 2.4. The air valve sealing cap 2.1 is connected with the air valve core 2.2 by threads. The air valve sealing cap 2.1 can isolate an air valve channel inside the air valve core 2.2 from the external environment, and the air chamber 9 is guaranteed to be a sealed volume when working. The outer side face of the inflation valve body 2.4 is in threaded connection with the inner side face of the air valve seat 3, the outer thread of the air valve seat 3 is in threaded connection with the stop nut 4, and installation and position fixing of the inflation valve 2 on the shell 7 are completed. In particular, the sealing gasket 2.3 is used to seal between the inflation valve body 2.4 and the air valve seat 3.

An air valve protective cover 1 is arranged outside the inflation valve 2, and the air valve protective cover 1 is in threaded connection with an air valve seat 3. The gas valve protective cover 1 can protect the gas charging valve 2 when the energy accumulator is in a non-charging state, and damage to the gas charging valve 2 in a working environment and a using process is reduced.

The end cover 20 is connected with the inner wall of the bottom of the shell 7 by a threaded ring 17, and the threaded ring 17 can be connected with external equipment by a screw 18 to fix the spatial position of the energy accumulator.

The surface of the end cover 20 matched with the inner wall of the lower end of the shell 7 is provided with a groove, and an O-shaped sealing ring 15 and a gasket 16 are arranged in the groove, so that a sealing effect can be achieved, and oil leakage is prevented.

And an oil side interface 19 communicated with the liquid cavity 14 is arranged on the end cover 20 and is connected with a hydraulic system through the oil side interface 19.

Preferably, the upper end surface of the end cover 20 is an arc surface structure, and the radian of the arc surface structure is the same as that of the permanent magnet. The advantage of this design lies in, and the up end of end cover 20 can fully laminate with the lower extreme of elastomer leather bag 8, makes the efficiency of energy storage ware sap cavity discharge fluid higher.

The upper end of the shell 7 is provided with a technical indication sleeve 5 for identifying the basic working parameter information of the energy accumulator.

As shown in fig. 3 and 4, the energy accumulator of the present invention further comprises a permanent magnet module 13, four coil winding columns 12.1, 12.2, 12.3 and 12.4, two wires 11 and a numerical control power supply connected with the wires 11; the permanent magnet module 13 is internally arranged at the bottom of the elastic body leather bag 8, the permanent magnet module 13 consists of four semicircular permanent magnets 13.1, 13.2, 13.3 and 13.4 with the same magnetism in pairs, every two permanent magnets 13.1 and 13.2 or 13.3 and 13.4 with different magnetism form a circular magnetic block, the two circular magnetic blocks are overlapped up and down according to positions with different magnetism to form the permanent magnet module 13, the size of the circular magnetic block is slightly smaller than the inner cross section of the shell 7, and the expansion or contraction of the elastic body leather bag 8 in the working process of the energy accumulator is not influenced.

As shown in fig. 5, the upper and lower end faces of the permanent magnets 13.1, 13.2, 13.3 and 13.4 are of arc-shaped structures, and the upper and lower end faces have the same radian and rounded edges. The advantage of this design lies in, at 8 volume expansions of elastomer leather bags or shrink in-process, the cambered surface structure is more easily with the 8 laminating of elastomer leather bags, avoids sharp-pointed edges and corners fish tail or punctures elastomer leather bags 8, influences the life of elastomer leather bags 8.

Preferably, the permanent magnet is made of rare earth permanent magnet material. The design has the advantages that the material has good magnetic property, good mechanical property, high precision, large shape freedom degree and light specific gravity, and can ensure that the energy accumulator of the invention obtains higher sensitivity.

The four coil winding columns are arranged on the outer wall of the shell 7, two coil winding columns 12.1 and 12.3 are located on one side of the shell 7, the other two coil winding columns 12.2 and 12.4 are located on the other side of the shell 7, and two ends of each lead wire 11 are wound on the two coil winding columns 12.1 and 12.2 or 12.3 and 12.4 located on different sides in a counterclockwise and clockwise mode respectively. The advantage of this design is that the alternating winding of the wire 11, when energized, can generate a plurality of magnetic fields that alternate in magnetic pole direction.

As shown in fig. 6, taking the coil winding legs 12.1 and 12.2 as an example, the wire 11 is wound between the coil winding leg 12.1 and the coil winding leg 12.2 in the specific manner described above. It should be noted that fig. 6 is a schematic diagram illustrating the movement principle of the permanent magnet module according to the present invention, and a conducting wire 11 is taken as an example to illustrate the movement principle of the permanent magnet according to the present invention. In practical application, a plurality of lead wires 11 can be wound on the coil winding post according to the principle and method shown in fig. 6, and a power supply is combined to form a plurality of electromagnetic coils with different winding directions, and the magnetic pole directions of the electromagnetic coils in the energized state follow the physical ampere rule.

Specifically, when the oil pressure of the liquid chamber 14 is required to be low in the use occasion of the energy accumulator of the present invention, on the premise that the gas mass in the air chamber 9 is fixed, a measure of reducing the current and the voltage passing through the lead 11 can be taken, so that the magnetic field intensity generated after the lead 11 is electrified is reduced, accordingly, the force applied by the permanent magnet module 13 in the magnetic field is reduced, and the oil pressure of the liquid chamber 14 is changed accordingly. When the accumulator of the invention needs high oil pressure in the liquid cavity 14 in use, the current and voltage passing through the lead 11 can be increased, so as to increase the magnetic field intensity, increase the force applied by the permanent magnet module 13 in the magnetic field, and change the pressure of the oil in the liquid cavity 14. When the pressure value of the hydraulic oil required by the use occasion of the energy accumulator exceeds the hydraulic oil pressure range which can be reached by adjusting the magnetic field intensity, the pressure of the gas in the gas cavity 9 can be changed to meet the requirement. It should be noted, however, that in order to guarantee the working performance of the elastomer bladder 8, there is a range of values for the gas pressure in the gas chamber 9 and therefore for the working pressure delivered by the accumulator according to the invention.

The coil protective sleeve 10 is arranged outside the shell 7, so that an internal lead 11 can be protected, electric shock of workers during operation of the equipment can be prevented, and the safety of the equipment is improved.

Pressure sensors are arranged in the air cavity 9 and the liquid cavity 14, a displacement sensor is arranged on the permanent magnet module 13, and a Hall element is arranged on the lead 11.

The energy accumulator also comprises a control system, wherein the control system comprises a PC, a DSP, a simulator, a plurality of conversion modules and a plurality of A/Ds; output signals of the pressure sensor, the displacement sensor and the Hall element enter A/D after being converted by the conversion module, the output signals are converted into digital signals through the A/D and then are transmitted to the DSP, the output end of the DSP is connected with the input end of the PC through the conversion module, the output end of the PC is connected with the input end of the DSP through the simulator, and the output end of the DSP is connected with the numerical control power supply through the conversion module.

The control principle of the accumulator according to the invention is explained below with reference to fig. 7:

the PC mainly finishes the display of the collected data, the DSP output signal is transmitted to the PC through the conversion module, and the PC displays the collected data. Meanwhile, the PC can also complete DSP program compiling and download the program to the DSP through the simulator.

The DSP has four inputs: a pressure sensor in the liquid chamber 14 detects the oil pressure in the liquid chamber 14; a pressure sensor in the air cavity 9 detects the air pressure in the elastic leather bag 8; the displacement sensor of the permanent magnet module 13 detects the displacement of the permanent magnet module 13; the hall element detects the magnitude of the magnetic field generated by the energized conducting wire 11. The signals output by each sensor are transmitted to the DSP through the conversion module and the A/D.

The DSP outputs signals according to a preset program, the signals are converted by the conversion module, the working state of the numerical control power supply is controlled, and the current and the voltage of the numerical control power supply determine the electrifying state of the lead 11. According to the physical ampere rule, the magnetic field generated after the conducting wire 11 is electrified interacts with the permanent magnet module 13 wrapped in the elastomer leather bag 8 to drive the permanent magnet module 13 to move.

The energy accumulator of the invention has different working modes when charging and discharging energy.

When the energy accumulator is discharged, if high oil pressure is needed, the DSP controls the output of the numerical control power supply, further controls the lead 11 to generate a corresponding magnetic field, drives the permanent magnet module 13 wrapped in the elastic body leather bag 8, supplements the reduced gas pressure in the gas cavity 9, and keeps the hydraulic pressure of oil in the liquid cavity 14 constant. If the required oil pressure is low, the working target of outputting constant-pressure oil can be realized by changing the gas capacity in the elastic body leather bag 8 and the electrifying state of the lead 11. Particularly, when an emergency occurs in actual operation, for example, the inflation valve 2 loses sealing performance, the magnetic field generated by the energization of the lead 11 can continuously drive the permanent magnet module 13, so that the hydraulic cavity 14 continuously outputs hydraulic oil with certain pressure, and property loss caused by accidents is reduced.

Specifically, assuming that the amount of the gas substance in the gas chamber 9 is fixed, the gas pressure at which the volume of the gas chamber 9 of the accumulator of the present invention is minimum in the operating state is defined as the gas maximum operating pressure. The gas pressure when the volume of the gas chamber 9 of the accumulator of the present invention is maximum in the working state is defined as the lowest working pressure of the gas. The constant oil pressure output by the accumulator under the working state is defined as the required oil pressure.

When the required oil pressure is lower than the gas minimum working pressure. The DSP controls the numerical control power supply to cut off the power of the conducting wire 11, and the conducting wire 11 forms a plurality of independent closed loops according to a specific winding mode. The permanent magnet module 13 is pushed by the elastomer bladder 8, changing the spatial position. According to the faraday's law of physics, the induced electromotive force is generated in the multiple independent closed loops formed by the wires 11, and the energy is converted into electric energy which can be stored. In this operating state, by changing the amount of electric energy recovered by the closed circuit, the hydraulic chamber 14 can output a constant hydraulic oil. Thus, the pressure energy of the gas is converted into electric energy and pressure energy required by the hydraulic system. If the pressure energy of the gas is larger than the sum of the electric energy which can be stored by the energy accumulator and the pressure energy required by the hydraulic system, the DSP controls the numerical control power supply to electrify the lead 11, controls the motion state of the permanent magnet module 13, enables the permanent magnet module 13 to block the expansion of the elastic body leather bag 8, consumes the pressure energy of the gas and enables the liquid cavity 14 to output oil liquid with constant pressure.

When the required oil pressure is between the gas maximum working pressure and the gas minimum working pressure. The working state of the energy accumulator is divided into two parts according to the real-time pressure of the gas in the gas cavity 9. When the real-time pressure of the gas in the gas cavity 9 is less than or equal to the highest working pressure of the gas and is simultaneously greater than the required oil pressure, the DSP controls the numerical control power supply to cut off the power of the lead wire 11, and a plurality of independent closed loops are formed for recovering electric energy. When the real-time pressure of the gas in the gas cavity 9 is less than or equal to the required oil pressure and is greater than or equal to the minimum working pressure of the gas, the DSP controls the output of the numerical control power supply, so that the conducting wire 11 is electrified to generate a corresponding magnetic field, the permanent magnet module 13 wrapped in the elastomer leather bag 8 is driven, the supplement is provided for the reduced gas pressure in the gas cavity 9, and the hydraulic pressure of the oil in the liquid cavity 14 is kept constant.

When the required oil pressure is higher than the highest working pressure of the gas, the DSP controls the output of the numerical control power supply, so that the conducting wire 11 is electrified to generate a corresponding magnetic field, the permanent magnet module 13 wrapped in the elastomer leather bag 8 is driven, the supplement is provided for the gas pressure reduced in the gas cavity 9, and the hydraulic pressure of the oil in the liquid cavity 14 is kept constant.

When the energy accumulator of the invention is charged, the conducting wire 11 is cut off and a plurality of independent closed loops are formed. The permanent magnet module 13 is pushed by the hydraulic oil in the liquid chamber 14, and the spatial position is changed. According to the faraday's law of physics, the multiple independent closed loops formed by the wires 11 generate induced electromotive force, and hydraulic energy is converted into electric energy. Meanwhile, the hydraulic oil in the liquid chamber 14 extrudes the elastic body leather bag 8, and the hydraulic energy is converted into the pressure energy of the gas in the elastic body leather bag 8. The on-off state of the loop of the lead 11 and the pressure state of the gas in the elastic body leather bag 8 are changed, and the specific form of energy recovery can be selected according to the working requirement.

Therefore, the energy accumulator has the advantages of constant output pressure, large effective volume, wide range of working parameters, long service life, sensitive reaction, high energy recovery rate and the like, and can be widely applied to hydraulic systems in various working occasions.

In summary, the specific working principle of the accumulator of the present invention is described by combining the actual working process of the conventional hydraulic accumulator as follows:

when the accumulator is connected to the hydraulic system and outputs pressure oil. According to boeing's law, the volume of gas in the elastomeric bladder 8 increases and the pressure of the gas decreases, while the pressure to which the oil in the hydraulic chamber 14 is subjected decreases. And a pressure sensor in the air cavity 9 detects pressure drop and transmits a signal to the DSP chip through a conversion module and an A/D. The DSP outputs signals according to the internal program, and the signals pass through the conversion module to control the numerical control power supply. The numerical control power supply outputs specific current and voltage according to the instruction. According to the physical ampere rule, the conducting wire 11 in the electrified state generates a magnetic field to interact with the permanent magnet module 13, and the permanent magnet module 13 is driven to move.

The movement of the permanent magnet module 13 is shown in fig. 6, and the permanent magnet 13.3 is taken as an example for explanation.

The magnetic field state generated when the conducting wire 11 is electrified at a certain moment is shown in fig. 6, and the permanent magnet 13.3 is attracted by the front opposite magnetic pole and repelled by the rear same magnetic pole, so that the trend of forward movement is generated, and the permanent magnet moves forward for a certain displacement to reach a new position. At the next moment, the DSP controls the exchange of the positive pole and the negative pole of the numerical control power supply, the state of the magnetic field generated after the conducting wire 11 is electrified is reversed, and the permanent magnet 13.3 is still attracted by the front opposite magnetic pole and repelled by the rear same magnetic pole at the new position. Thus, the permanent magnet 13 can move forward all the time, and finally the permanent magnet module 13 drives the elastic leather bag 8 to be attached to the end cover 20. According to the principle of physics, the DSP can generate magnetic fields with different strengths and magnetic pole directions by controlling the numerical control power supply and changing the voltage and current output by the numerical control power supply, and accordingly, the size and the direction of the stress of the permanent magnet 13.3 can be changed. The different motion states of the permanent magnet module 13 can compensate the pressure drop of the oil in the liquid cavity 14 caused by the volume expansion of the gas in the gas cavity 9, so that the oil in the liquid cavity 14 reaches a constant pressure value, the aim of outputting constant-pressure hydraulic oil in the working process of the energy accumulator is fulfilled, and the volume efficiency of the energy accumulator is improved. Meanwhile, the stress magnitude and direction of the permanent magnet 13 module are changed according to the method, or the gas content in the elastic body leather bag 8 is changed, and the magnitude of the constant pressure value output by the oil liquid in the liquid cavity 14 can also be changed, so that the working parameter range of the invention is wide, and the invention can be applied to various occasions.

When the accumulator of the present invention is connected to the hydraulic system and absorbs the pressure oil. The DSP outputs signals, and the power of the lead 11 is controlled to be cut off through a conversion module, so that the lead 11 forms a plurality of independent closed loops according to different winding modes. Hydraulic oil in the hydraulic system enters the liquid cavity 14 of the accumulator of the invention through the oil side port 19, and pushes the permanent magnet module 13 to move and extrude the elastomer bladder 8. Because the permanent magnet module 13 generates displacement, according to the law of faraday's electromagnetism, the magnetic flux of the magnetic field passing through the closed loop formed by the conducting wire 11 is changed, and the induced electromotive force is generated in the closed loop formed by the conducting wire 11 and can be recovered and stored. Thus, a portion of the pressure energy of the oil entering the chamber 14 of the accumulator of the present invention is converted to electrical energy. Meanwhile, the elastic body leather bag 8 is extruded by the permanent magnet module 13, and according to the Boyle's law of gas, the volume of the gas in the elastic body leather bag 8 is reduced, and the pressure is increased. A portion of the pressure energy of the oil entering the accumulator chamber 14 of the present invention is converted to pressure energy of gas. When hydraulic energy is not required to be converted into electric energy, the DSP controls the lead 11 to be in an open circuit state, and the accumulator only recovers the pressure energy of the oil.

Particularly, when the elastic body leather bag 8 is made of a magnetic rubber material, the function of the magnetic rubber elastic body leather bag is equivalent to the function of the elastic body leather bag 8 and the permanent magnet module 13 in the invention, but the working principle and the working mode are not changed, so that the invention is not repeated.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims. It is to be understood that the above description is intended to be illustrative, and not restrictive.

Claims

1. An electromagnetic auxiliary leather bag type constant-pressure energy accumulator comprises a shell (7), an elastic leather bag (8) arranged in the shell (7), an end cover (20) arranged at the bottom of the shell (7) and an air valve seat (3) arranged at the top of the shell (7); the elastic body leather bag (8) divides the interior of the shell (7) into an air cavity (9) and a liquid cavity (14), an inflation valve (2) communicated with the air cavity (9) is installed on the air valve seat (3), and an oil side interface (19) communicated with the liquid cavity (14) is arranged on the end cover (20);

the method is characterized in that: the permanent magnet motor also comprises a permanent magnet module (13), four coil winding columns (12.1, 12.2, 12.3 and 12.4), two leads (11) and a numerical control power supply connected with the leads (11); the permanent magnet module (13) is arranged at the bottom of the elastic body leather bag (8) in a built-in mode, the four coil winding columns are arranged on the outer wall of the shell (7), two coil winding columns (12.1 and 12.3) are located on one side of the shell (7), the other two coil winding columns (12.2 and 12.4) are located on the other side of the shell (7), and two ends of each lead (11) are wound on the two coil winding columns (12.1 and 12.2 or 12.3 and 12.4) located on different sides in a counterclockwise and clockwise mode respectively.

2. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: pressure sensors are arranged in the air cavity (9) and the liquid cavity (14), a displacement sensor is arranged on the permanent magnet module (13), and a Hall element is arranged on the lead (11).

3. The electromagnetic assisted bladder type constant pressure accumulator of claim 2, wherein: the system also comprises a control system, wherein the control system comprises a PC, a DSP, a simulator, a plurality of conversion modules and a plurality of A/Ds; output signals of the pressure sensor, the displacement sensor and the Hall element enter A/D after being converted by the conversion module, the output signals are converted into digital signals through the A/D and then are transmitted to the DSP, the output end of the DSP is connected with the input end of the PC through the conversion module, the output end of the PC is connected with the input end of the DSP through the simulator, and the output end of the DSP is connected with the numerical control power supply through the conversion module.

4. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: the permanent magnet module (13) is composed of four semicircular permanent magnets (13.1, 13.2, 13.3 and 13.4) with the same magnetism in pairs, every two permanent magnets (13.1 and 13.2 or 13.3 and 13.4) with different magnetism form a circular magnetic block, and the two circular magnetic blocks are overlapped up and down according to positions with different magnetism to form the permanent magnet module (13).

5. The electromagnetic assisted bladder type constant pressure accumulator of claim 4, wherein: the upper end face and the lower end face of each permanent magnet (13.1, 13.2, 13.3 and 13.4) are of cambered surface structures.

6. The electromagnetic assisted bladder type constant pressure accumulator of claim 5, wherein: the upper end face of the end cover (20) is of an arc-shaped structure, and the radian of the arc-shaped structure is the same as that of the permanent magnet.

7. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: an air valve protective cover (1) is arranged outside the inflation valve (2), and the air valve protective cover (1) is connected with an air valve seat (3).

8. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: and a coil protective sleeve (10) is arranged outside the shell (7).

9. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: the air valve seat (3) is fixed at the upper end of the shell (7) through a stop nut (4), and a sealing ring (6) is arranged between the lower end of the air valve seat (3) and the inner wall of the upper end of the shell (7).

10. The electromagnetic assisted bladder type constant pressure accumulator of claim 1, wherein: the upper end of the shell (7) is provided with a technical indication sleeve (5).