CN107357320B - Self-excited flow regulating system - Google Patents
Self-excited flow regulating system Download PDFInfo
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- CN107357320B CN107357320B CN201710573489.5A CN201710573489A CN107357320B CN 107357320 B CN107357320 B CN 107357320B CN 201710573489 A CN201710573489 A CN 201710573489A CN 107357320 B CN107357320 B CN 107357320B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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Abstract
The invention relates to a self-excitation flow regulating system, which comprises a positive displacement flow measuring mechanism, a self-excitation speed regulating electromagnetic device, a control system and a power supply system, wherein the positive displacement flow measuring mechanism is connected with the control system; the volume type flow measuring mechanism is coaxially connected with the self-excitation speed regulation electromagnetic device, and the self-excitation speed regulation electromagnetic device is connected with the control system and the power supply system; the control system monitors flow information measured by the positive displacement flow measuring mechanism, and controls the rotating speed of the positive displacement flow measuring mechanism by adjusting the exciting current of the self-excitation speed-regulating electromagnetic device while monitoring the flow, so as to control the flow passing through the flow measuring mechanism; the positive displacement flow measuring mechanism drives the self-excitation speed regulation electromagnetic device to generate electricity and supply the electric energy to the control system and the power supply system when fluid passes through the positive displacement flow measuring mechanism. The flow regulating device has simple structure and low energy consumption, and can complete self-generating energy supply on the premise of completing flow measurement, regulation and control.
Description
Technical Field
The invention belongs to the technical field of flow regulation and control, and particularly relates to a self-excitation flow regulation system.
Background
Modern industrial automated fluid flow control requires that the flow regulating control device maintain a constant discharge volume, and that such constant discharge volume should not be affected by upstream flow factors.
A conventional fluid flow control system generally comprises three parts, namely a flow measuring device, a flow regulating device and a control device. The flow measuring device generally measures the instantaneous flow and the accumulated flow of the fluid by a flowmeter based on a corresponding principle according to the properties of the fluid, and the measurement result is used as an input signal of the control device; the flow regulating device is generally completed by a regulating valve, and the regulating valve can receive a command of the control device and achieve the purpose of regulating the flow through the opening degree of the regulating valve; the control device calculates the opening data of the regulating valve according to the set flow data and the received flow data and instructs the regulating valve to regulate.
At present, no flow regulating device can completely and automatically complete the tasks of measuring, regulating and controlling the flow synchronously.
Disclosure of Invention
The invention aims to provide a self-excitation flow regulating system, which solves the problems of complex structure, large energy consumption and insufficient measurement, regulation and control of flow of the existing flow regulating device.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the self-excitation flow regulating system comprises a volume type flow measuring mechanism, a self-excitation speed regulating electromagnetic device, a control system and a power supply system;
the volume type flow measuring mechanism is coaxially connected with the self-excitation speed regulation electromagnetic device, and the self-excitation speed regulation electromagnetic device is connected with the control system and the power supply system; the control system monitors flow information measured by the positive displacement flow measuring mechanism, and controls the rotating speed of the positive displacement flow measuring mechanism by adjusting the exciting current of the self-excitation speed-regulating electromagnetic device while monitoring the flow, so as to control the flow passing through the flow measuring mechanism; the positive displacement flow measuring mechanism drives the self-excitation speed regulation electromagnetic device to generate electricity and supply the electric energy to the control system and the power supply system when fluid passes through the positive displacement flow measuring mechanism.
The positive displacement flow measuring mechanism comprises a shell, a measuring rotor and a measuring output shaft;
the self-excitation speed regulation electromagnetic device comprises a power generation part and a braking part;
the power generation part comprises a power generation part shell, a power generation stator, a power generation rotor magnetic pole coil and a power generation part output shaft, wherein the power generation stator, the power generation rotor magnetic pole coil and the power generation part output shaft are arranged in the power generation part shell;
the brake part comprises a brake part shell, an eddy current disc, a brake rotor and a brake rotor magnetic pole coil, wherein the eddy current disc, the brake rotor and the brake rotor magnetic pole coil are arranged in the brake part shell;
the control system comprises a power generation rotor coil slip ring, a brake rotor coil slip ring, an excitation control module, a controller, a communication module, a universal measurement interface module and a man-machine interface module; the controller is respectively connected with the excitation control module, the communication module, the general measurement interface module, the man-machine interface module and the rotating speed measurement device;
the power supply system comprises a power supply module and a storage battery connected with the power supply module, and the power supply module is connected with the power generation part and the excitation control module.
The volume type flow measuring mechanism is an elliptical gear wheel flow measuring meter or a scraper type flow measuring meter.
The rotating speed measuring device is selected from a photoelectric rotating speed measurer, a Hall rotating speed measurer or a mechanical rotating speed measurer.
The vortex disc is of a cylindrical structure with an opening at the front end.
The invention has the beneficial effects that:
1. the invention selects volumetric measuring meters such as elliptic gears or scraper mechanisms, does not need straight pipes for flow equalization, is convenient to assemble and disassemble, and can accurately measure and control the flow; meanwhile, the positive displacement flow measuring mechanism can be used as a power source of the self-excitation speed regulation electromagnetic device;
2. the design of the self-excitation speed regulation electromagnetic device simultaneously meets the functions of power generation, braking and a motor; the self-excitation speed regulation electromagnetic device can provide a power supply and an excitation power supply for the whole system while regulating the speed of the volumetric flow measurement mechanism, and the principle is that the electromagnetic coupling force of a power generation rotor, a brake rotor and a power generation stator is changed by regulating the magnitude of excitation current so as to change the torque of a measurement output shaft and further regulate the flow;
3. the power supply and the excitation power supply used by the invention are both from a self-excitation speed regulation electromagnetic device; when there is no fluid, the system is not operating; if fluid flows through the volume type flow measuring mechanism, the electromagnetic device is dragged to rotate to generate electricity, the state of adjusting the exciting current can be achieved through short adjustment, and once the exciting current is adjusted, the whole system enters a normal working state.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure, 1-volume flow measuring mechanism, 2-generator housing, 3-generator stator, 4-generator rotor, 5-generator rotor magnetic pole coil, 6-brake housing, 7-eddy current disc, 8-brake rotor, 9-brake rotor magnetic pole coil, 10-rotating speed measuring device, 11-generator rotor coil slip ring and 12-brake rotor coil slip ring.
Detailed Description
The invention relates to a self-excitation flow regulating system, which comprises a positive displacement flow measuring mechanism 1, a self-excitation speed regulating electromagnetic device, a control system and a power supply system;
the positive displacement flow measuring mechanism 1 is coaxially connected with a self-excitation speed regulation electromagnetic device, and the self-excitation speed regulation electromagnetic device is connected with a control system and a power supply system; the control system monitors flow information measured by the volume type flow measuring mechanism 1, and controls the rotating speed of the volume type flow measuring mechanism by adjusting the exciting current of the self-excitation speed regulation electromagnetic device while monitoring the flow, so as to control the flow passing through the flow measuring mechanism 1; when fluid passes through, the positive displacement flow measuring mechanism 1 drives the self-excitation speed regulation electromagnetic device to generate electricity, and the electricity is supplied to a control system and stored in a power supply system.
The volume type flow measuring mechanism 1 comprises a shell, a measuring rotor and a measuring output shaft, the volume type flow measuring mechanism 1 of the invention adopts an elliptic gear wheel flow measuring meter or a scraper type flow measuring meter, taking an elliptic gear flow measuring meter as an example, an elliptic gear is composed of two mutually meshed elliptic gear shells, the elliptic gear rotates under the action of differential pressure △ P = P1-P2(P1 is inlet pressure, P2 is outlet pressure) of a measured fluid medium, and the flow calculation formula is as follows:
Q=4NU0
n: gear rotation speed (rev/sec)
U0: the gear rotates a fixed volume of flow output at one quarter.
The self-excitation speed-regulating electromagnetic device is a specially designed electrical equipment, and is formed from two portions: an electromagnetic induction power generation part and an eddy current braking part; the power generation part can realize the dragged and dragged functions, and the braking part can realize the braking function;
the power generation part comprises a power generation part shell 2, a power generation stator 3 arranged in the power generation part shell 2, a power generation rotor 4 (which can be excited), a power generation rotor magnetic pole coil 5 and a power generation part output shaft, wherein the power generation rotor 4 is arranged in the power generation stator 3, the power generation rotor 4 is wound on the power generation rotor magnetic pole coil 5, the power generation part output shaft penetrates through the power generation rotor 4, and the front end of the power generation part output shaft is coaxially connected with the measurement output shaft;
in the power generation section, when a current flows through the power generation rotor pole coil 5, a magnetic field is generated, and the power generation rotor 4 rotates, and the magnetic field also rotates. The coil of the power generation stator 3 must have an induced potential, and the magnitude of the induced potential is as follows:
E=4.44KFNΦ
k: winding factor
N: number of turns per phase winding, F: frequency (rotation speed), Φ: monopole magnetic field strength, E: an electromotive force is induced.
Phi: the monopole magnetic field strength is determined by the magnitude of the field current in the rotor coil.
The brake part comprises a brake part shell 6, and a vortex disc 7, a brake rotor 8 (excitable) and a brake rotor magnetic pole coil 9 which are arranged in the brake part shell 6, wherein the vortex disc 7 is of a cylindrical structure with an opening at the front end; the brake rotor 8 is arranged in the vortex disc 7, the brake rotor 8 is wound with the brake rotor magnetic pole coil 9, the brake rotor 8 is internally provided with a brake part output shaft in a penetrating way, the front end of the brake part output shaft is coaxially connected with the rear end of the power generation part output shaft, and the rear end of the brake part output shaft is connected with a rotating speed measuring device 10;
in the brake section, when a current flows through the brake rotor pole coil 9, a magnetic field is generated, and the brake rotor 8 rotates, and the magnetic field also rotates. The rotating magnetic field induces eddy current in the eddy disk 7, and the magnetic field generated by the eddy current and the magnetic field generated by the exciting current of the brake rotor 8 interact with each other to achieve the purpose of braking.
Therefore, when the measuring speed of the positive displacement flow measuring mechanism 1 is greater than the setting speed, increasing the exciting current of the generating rotor magnetic pole coil 5 is equivalent to increasing the load of the generating part, the magnetic power output by the generating part is increased, the port voltage of the generating part rises, and a certain braking effect is realized on the speed, when the exciting current of the generating rotor magnetic pole coil 5 reaches the upper limit and the measuring speed is still higher than the setting speed, the exciting current of the braking rotor magnetic pole coil 9 is increased, the induced current of the vortex disc 7 is increased, and the braking torque is increased, so that the purpose of adjusting the rotating speed of the positive displacement flow measuring mechanism 1 is achieved. And vice versa.
The control system comprises a power generation rotor coil slip ring 11, a brake rotor coil slip ring 12, an excitation control module, a controller, a communication module, a universal measurement interface module and a man-machine interface module; the power generation rotor magnetic pole coil 5 and the brake rotor magnetic pole coil 6 are respectively connected with the excitation control module through a power generation rotor coil slip ring 11 and a brake rotor coil slip ring 12, and the controller is respectively connected with the excitation control module, the communication module, the universal measurement interface module, the man-machine interface module and the rotating speed measuring device 10;
the excitation control module: and finishing the regulation of the generating exciting current and the braking exciting current according to the instruction of the controller, and finishing the generating regulation at the same time.
A controller: the rotating speed of the self-excitation speed regulation electromagnetic device is controlled by receiving a human machine interface module (HMI) or a remote instruction requirement, and the exciting current of the magnetic pole coil 5 of the generating rotor and the exciting current of the magnetic pole coil 9 of the braking rotor are regulated in real time according to the set rotating speed and the measured rotating speed at ordinary times, so that the purposes of stabilizing the speed and stabilizing the current are achieved. In the case of a demand for a stable flow, the excitation current is also adjusted in time due to the change in the inlet pressure.
And the human-machine interface module (HMI) is provided with L CD display and manual data input keys, and realizes operations such as real-time data viewing, flow setting, time correction and the like.
A communication module: and wired RS485 communication is realized, and a common secondary instrument communication protocol is supported. And wireless (including WIFI) communication is realized, and the communication with a field operation unit or a background industrial automation system is realized.
Rotation speed measuring device 10: and a photoelectric rotating speed measurer, a Hall rotating speed measurer or a mechanical rotating speed measurer is selected.
The controller of the invention can also be externally connected with sensors with various standard interfaces such as temperature, pressure, water level and the like to finish the measurement of other physical quantities.
The power supply system comprises a power supply module and a storage battery connected with the power supply module, and the power supply management module is connected with the power generation part and the excitation control module and comprises a control circuit and a protection circuit. The power management module completes voltage conversion and provides power for the controller, the rotating speed measuring device 10, the communication module, a human-machine interface module (HMI) and other measuring units, and the voltage management has the functions of voltage stabilization, overcurrent and overvoltage protection and the function of charging and discharging management of the standby storage battery.
The working process of the invention is described below:
when fluid flows through the positive displacement flow measuring mechanism 1, the mechanism rotates under the action of fluid pressure difference, a fixed volume of fluid flows through the mechanism every revolution, the rotating speed measuring device 10 counts the number of revolutions, namely the real-time passing flow can be known, and the passing flow is in direct proportion to the rotating speed of a measuring rotor;
the volume type flow measuring mechanism 1 drags a coaxially installed self-excitation speed regulation electromagnetic device while rotating, a power generation part of the self-excitation speed regulation electromagnetic device generates power under the rotation of a power generation rotor 4, electric energy is provided for each part of a control system through a power supply management module, and residual electric quantity is stored in a storage battery;
when a fixed flow flows through, the self-excitation speed regulating electromagnetic device has a fixed rotating speed, the power generation part of the self-excitation speed regulating electromagnetic device keeps fixed power generation output power, and the braking part of the self-excitation speed regulating electromagnetic device keeps fixed braking torque.
If the input fluid pressure (flow) is larger than the preset flow value, the rotating speed of the self-excitation speed regulation electromagnetic device is increased, the excitation control module increases the excitation current of the magnetic pole coil 5 of the power generation rotor through the power generation rotor coil slip ring 11 to realize the speed reduction effect of the power generation rotor 4, meanwhile, the excitation control module increases the excitation current of the magnetic pole coil 9 of the brake rotor through the brake rotor coil slip ring 12 to increase the brake torque of a brake part to brake the measurement rotor of the volumetric flow measurement mechanism 1, and further, the flow speed is ensured to be stable.
If the input fluid pressure (flow) is reduced, the rotation speed of the self-excitation speed regulation electromagnetic device is reduced, the excitation control module reduces the excitation current of the power generation rotor magnetic pole coil 5 through the power generation rotor coil slip ring 11 to reduce the deceleration effect on the positive displacement flow measuring mechanism 1, and meanwhile, the excitation control module reduces the excitation current of the brake rotor magnetic pole coil 9 through the brake rotor coil slip ring 12 to reduce the braking effect on the positive displacement flow measuring mechanism 1, so that the preset flow speed is improved and maintained.
Thus, the integration of measurement, regulation and control of the fluid is realized.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (4)
1. Self-excited flow regulation system, its characterized in that: the device comprises a positive displacement flow measuring mechanism (1), a self-excitation speed regulation electromagnetic device, a control system and a power supply system;
the positive displacement flow measuring mechanism (1) is coaxially connected with the self-excitation speed regulation electromagnetic device, and the self-excitation speed regulation electromagnetic device is connected with the control system and the power supply system; the control system monitors flow information measured by the volume type flow measuring mechanism (1), and controls the rotating speed of the volume type flow measuring mechanism by adjusting the exciting current of the self-excited speed regulating electromagnetic device while monitoring the flow, so that the flow passing through the flow measuring mechanism (1) is controlled; the positive displacement flow measuring mechanism (1) drives the self-excitation speed regulation electromagnetic device to generate electricity and supply electric energy to the control system and the power supply system when fluid passes through;
the positive displacement flow measuring mechanism (1) comprises a shell, a measuring rotor and a measuring output shaft;
the self-excitation speed regulation electromagnetic device comprises a power generation part and a braking part;
the power generation part comprises a power generation part shell (2), a power generation stator (3), a power generation rotor (4), a power generation rotor magnetic pole coil (5) and a power generation part output shaft, wherein the power generation stator (3), the power generation rotor (4), the power generation rotor magnetic pole coil (5) and the power generation part output shaft are arranged in the power generation part shell (2), the power generation rotor (4) is wound on the power generation rotor magnetic pole coil (5), the power generation part output shaft penetrates through the power generation rotor (4), and the front end of the power generation part output shaft is coaxially connected with the measurement output shaft;
the brake part comprises a brake part casing (6), and an eddy current disc (7), a brake rotor (8) and a brake rotor magnetic pole coil (9) which are arranged in the brake part casing (6), wherein the brake rotor (8) is arranged in the eddy current disc (7), the brake rotor (8) is wound on the brake rotor magnetic pole coil (9), a brake part output shaft penetrates through the brake rotor (8), the front end of the brake part output shaft is coaxially connected with the rear end of the power generation part output shaft, and the rear end of the brake part output shaft is connected with a rotating speed measuring device (10);
the control system comprises a power generation rotor coil slip ring (11), a brake rotor coil slip ring (12), an excitation control module, a controller, a communication module, a universal measurement interface module and a man-machine interface module; the power generation rotor magnetic pole coil (5) and the brake rotor magnetic pole coil (9) are respectively connected with the excitation control module through a power generation rotor coil slip ring (11) and a brake rotor coil slip ring (12), and the controller is respectively connected with the excitation control module, the communication module, the universal measurement interface module, the man-machine interface module and the rotating speed measuring device (10);
the power supply system comprises a power supply module and a storage battery connected with the power supply module, and the power supply module is connected with the power generation part and the excitation control module.
2. The self-exciting flow rate adjusting system according to claim 1, wherein: the positive displacement flow measuring mechanism (1) is an elliptical gear wheel flow measuring meter or a scraper plate flow measuring meter.
3. The self-exciting flow rate adjusting system according to claim 2, wherein: the rotating speed measuring device (10) is selected from a photoelectric rotating speed measurer, a Hall rotating speed measurer or a mechanical rotating speed measurer.
4. The self-exciting flow rate adjusting system according to claim 3, wherein: the vortex disc (7) is of a cylindrical structure with an opening at the front end.
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| CN201710573489.5A CN107357320B (en) | 2017-07-14 | 2017-07-14 | Self-excited flow regulating system |
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| CN201710573489.5A CN107357320B (en) | 2017-07-14 | 2017-07-14 | Self-excited flow regulating system |
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| CN116371276A (en) * | 2023-06-07 | 2023-07-04 | 佛山鸿威技术有限公司 | Passive fluid mixing system and method |
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| CN201066293Y (en) * | 2007-06-27 | 2008-05-28 | 空军油料研究所 | Wireless digital waist wheel capacity flowmeter |
| CN101469668B (en) * | 2007-12-25 | 2011-02-16 | 上海万德风力发电股份有限公司 | Small power electromagnetic deceleration pressure-limiting wind and solar energy mutual-complementing power generation system |
| JP2009237608A (en) * | 2008-03-25 | 2009-10-15 | Nippon Telegr & Teleph Corp <Ntt> | Flow control device |
| CN101776177A (en) * | 2009-12-29 | 2010-07-14 | 王建业 | Tap with digital readout and LED lamp |
| CN102967002B (en) * | 2011-09-02 | 2015-12-02 | 石兆玉 | Household based heat metering regulation device |
| CN103723593A (en) * | 2013-12-06 | 2014-04-16 | 镇江新区科力迪机电科技有限公司 | Generator exciting-current speed-regulating elevator descent control device |
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Effective date of registration: 20201113 Address after: Room 11231, unit 1, building 3, No. 11, Tangyan South Road, hi tech Zone, Xi'an City, Shaanxi Province Patentee after: XI'AN YONGRUI AUTOMATION Co.,Ltd. Address before: 710071 53-1-1, South courtyard two, Taibai South Road, Xi'an, Shaanxi Patentee before: Yang Yongfeng |