CN102561460A - Intelligent variable-frequency constant-pressure water supply system - Google Patents
Intelligent variable-frequency constant-pressure water supply system Download PDFInfo
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- CN102561460A CN102561460A CN2010105893724A CN201010589372A CN102561460A CN 102561460 A CN102561460 A CN 102561460A CN 2010105893724 A CN2010105893724 A CN 2010105893724A CN 201010589372 A CN201010589372 A CN 201010589372A CN 102561460 A CN102561460 A CN 102561460A
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Abstract
The invention discloses an intelligent variable-frequency constant-pressure water supply system. A control center is connected with a PID (proportion integration differentiation) regulator. A pressure transmitter detects pressure data of network pipes of a hot water circulation mechanism, and the pressure data are subjected to A/D (analog to digital) conversion and transmitted to the PID regulator. The PID regulator corrects and regulates the pressure data and subjects the pressure data to PID operation, and results of the PID operation are fed back to a variable frequency driver. The variable frequency driver outputs frequency to control a motor pump unit according to the results of the PID operation so that fluctuation of network pipe pressure is minimized. The control center comprises a programmable logic controller and a single-chip microcomputer microprocessor, the programmable logic controller is mutually connected with the single-chip microcomputer microprocessor, the programmable logic controller processes control of on-off logic operation, the single-chip microcomputer microprocessor processes weak signals and monitors operational normality of the system. The intelligent variable-frequency constant-pressure water supply system is capable of supplying water under constant pressure, is high in automation level, operates automatically, and is efficient, energy-saving, and reliable and stable in performance.
Description
Technical field
The present invention relates to the water system field, relate in particular to a kind of intelligent frequency-conversion constant pressure water supply system.
Background technology
Traditional constant pressure water supply mode is to adopt facilities such as water tower, high water level case, air pressure tank to realize.At present, the constant pressure water supply system is widely used in water system, and most water system all requires to adopt the constant pressure water supply system.The constant pressure water supply system is meant when water supply volume changes in water supply network, the way of supplying water that outlet pressure remains unchanged.The outlet pressure value of water supply network is confirmed according to user's request.The constant pressure water supply system carries out stepless speed regulation to pump motor, passes through Microcomputer Detecting, computing according to water supply volume and variation in water pressure, changes pump rotary speed automatically and keeps water pressure invariableness to satisfy the water requirement.But the energy-saving effect of constant pressure water supply system and reliability and stability are still waiting to improve.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that remedies prior art, and purpose is to provide a kind of intelligent frequency-conversion constant pressure water supply system, and on the basis of realizing constant pressure water supply, automaticity is high, and system moves voluntarily, and is energy-efficient, and dependable performance is stable.
For solving above technical problem; Technical scheme of the present invention is that a kind of intelligent frequency-conversion constant pressure water supply system is except comprising hot water circuit mechanism; Said hot water circuit mechanism comprises storage tank, electric-motor pump group, user side; Said storage tank, electric-motor pump group and user side form hot-water return through pipeline, also comprise control centre, PID adjuster, variable frequency drives and pressure transmitter, and said control centre is connected with said PID adjuster; Said pressure transmitter detects the webmaster pressure data of said hot water circuit mechanism, and pressure data is carried out sending to said PID adjuster after the A/D conversion; Said PID adjuster is proofreaied and correct adjustment and PID computing to pressure data, and the PID operation result is fed back to said variable frequency drives; Said variable frequency drives is controlled said electric-motor pump group according to PID operation result output frequency, minimizes with the fluctuation that reaches webmaster pressure.
Preferably; Pipeline between said user side and the said storage tank is provided with the return water temperature control device; Said return water temperature control device is connected with said control centre; Said return water temperature control device sends to said control centre with return water temperature, and said control centre is according to the operation of return water temperature adjusting heat pump water-heating machine unit, and said heat pump water-heating machine unit is connected with said storage tank.
Preferably, said storage tank is connected with said control centre, and said storage tank is provided with the temperature detection device, and said storage tank sends to control centre with the storage tank temperature, and said control centre is according to the operation of storage tank adjustment heat pump water-heating machine unit.
Preferably, said intelligent frequency-conversion constant pressure water supply system also comprises touch-screen, and said touch-screen is connected with said control centre, and said touch-screen is for realizing the man-machine communication interface to the operation of said control centre.
Preferably, said control centre comprises programmable logic controller and singlechip microprocessor, and said programmable logic controller and singlechip microprocessor interconnect, and said programmable logic controller is handled switching value logical operation control; Said singlechip microprocessor is handled the supervision of the normal operation of weak signal and system.
Preferably, said control centre is provided with automatic operational module and manual work module.
Preferably, said control centre is provided with outage reminiscence module, preserves and reply the preceding running status of outage.
Intelligent frequency-conversion constant pressure water supply system provided by the invention, control centre is connected with the PID adjuster; Pressure transmitter detects the webmaster pressure data of hot water circuit mechanism, and pressure data is carried out sending to the PID adjuster after the A/D conversion; The PID adjuster is proofreaied and correct adjustment and PID computing to pressure data, and the PID operation result is fed back to variable frequency drives; Variable frequency drives is controlled the electric-motor pump group according to PID operation result output frequency, minimizes with the fluctuation that reaches webmaster pressure.Compared with prior art, intelligent frequency-conversion constant pressure water supply system provided by the invention, on the basis of realizing constant pressure water supply, automaticity is high, and system moves voluntarily, and is energy-efficient, and dependable performance is stable.
Description of drawings
Fig. 1 is the structural representation of intelligent frequency-conversion constant pressure water supply system among the present invention.
The specific embodiment
For those skilled in the art can understand technical scheme provided by the present invention better, set forth below in conjunction with specific embodiment.
See also Fig. 1, this figure is the structural representation of intelligent frequency-conversion constant pressure water supply system among the present invention.
Intelligent frequency-conversion constant pressure water supply system provided by the invention; Except comprising hot water circuit mechanism; Hot water circuit mechanism comprises storage tank, electric-motor pump group, user side; Storage tank, electric-motor pump group and user side form hot-water return through pipeline, also comprise control centre, PID adjuster, variable frequency drives and pressure transmitter, and control centre is connected with the PID adjuster; Pressure transmitter detects the webmaster pressure data of hot water circuit mechanism, and pressure data is carried out sending to the PID adjuster after the A/D conversion; The PID adjuster is proofreaied and correct adjustment and PID computing to pressure data, and the PID operation result is fed back to variable frequency drives; Variable frequency drives is controlled the electric-motor pump group according to PID operation result output frequency, minimizes with the fluctuation that reaches webmaster pressure.
Pipeline between user side and the storage tank is provided with the return water temperature control device; The return water temperature control device is connected with control centre; The return water temperature control device sends to control centre with return water temperature; Control centre is according to the operation of return water temperature adjusting heat pump water-heating machine unit, and the heat pump water-heating machine unit is connected with storage tank.Storage tank is connected with control centre, and storage tank is provided with the temperature detection device, and storage tank sends to control centre with the storage tank temperature, and control centre is according to the operation of storage tank adjustment heat pump water-heating machine unit.
The intelligent frequency-conversion constant pressure water supply system also comprises touch-screen, and touch-screen is connected with control centre, and touch-screen is for realizing the man-machine communication interface to control centre's operation.Control centre comprises programmable logic controller and singlechip microprocessor, and programmable logic controller and singlechip microprocessor interconnect, and programmable logic controller is handled switching value logical operation control; Singlechip microprocessor is handled the supervision of the normal operation of weak signal and system.Control centre is provided with automatic operational module and manual work module.Control centre is provided with outage reminiscence module, preserves and reply the preceding running status of outage.
The principle of this intelligent frequency-conversion constant pressure water supply system: it is constant or constant basically to keep a physical quantity, should quote this physical quantity and constant relatively, forms closed-loop system.Keep the constant of hydraulic pressure, just must introduce hydraulic pressure value of feedback and set-point relatively, thereby form closed-loop system.Because of controlled system characteristics are systems non-linear, big inertia, realize the control of accurate science fast and safely, can when pressure oscillation is big, use fuzzy control, to accelerate response speed; Keep static accuracy in pressure limit than a hour employing PID adjuster.System adopts singlechip microprocessor and PLC (programmable logic controller) to add work side's examination that the intelligence instrument division of labor is handled, and system designs with security of operation, high stable performance, easy to operate design concept.
The performance of this intelligent frequency-conversion constant pressure water supply system and mentality of designing introduction are following:
Control centre is that PLC and singlechip microprocessor are formed; Adopt this way to be because the PLC source is to be the electric logic control of characteristic with the relay; It is the comparatively ideal controller of handling in the switching value sequential control; It carries out sequentially-operating according to logical condition, and carries out the control of interlock protection action according to logical relation.On the whole, being well suited for being used for carrying out with the sequential control is main automation engineering.Though the computing that PLC also can the treatment of simulated amount based on the working method of PLC, is communicated by letter with analog quantity and with miscellaneous equipment in the compound operation than complicated process such as operation in the lump handling digital switch quantity; Through facts have proved, because the mode working procedure of PLC to scan, it is just more dull that the scanning large program responds the speed of service in time; And result data is very easily made mistakes during compound operation; Antijamming capability is not enough again when carrying out operation of analog quantity especially, and is comparatively strict to cabling requirement, when scanning imaging system; System's scanning sometimes can be skipped a certain step; Even N continuous step, the just not response of certain step in scan period sometimes, but more be a N continuous scan period all not have responder.For these problems; Some system just presents the continuous start and stop of system; Or irregular duty occurs, but for the irregular startup of more powerful system equipment, as motor and the container that pressure is arranged are impacted; With stablizing of the life-span that influences motor and container conduit and pipeline valve greatly and electric equipment and whole electric power system, the irregular operation of motor and pressure are out of control then can to produce bigger potential safety hazard.This has very high requirement for the programming personnel, careless slightlyly just is out of order, and based on above reason, considers from the stability of security standpoint and whole system performance, for guaranteeing system long life-span, the necessary performance of improving whole system is arranged.Adopt method that singlechip microprocessor combines with PLC more human nature, solved this variety of problems more efficiently, faster; The advantage that continues using PLC is because PLC is stable reliably in the control of handling pure switching value; So this system still adopts the core of PLC as switching value logical operation control in handling the switching value logical operation, handle or the like with system normal operation monitoring with weak signal (analog signal and data signal) and then to give singlechip microprocessor to handle.This little processing important technological parameters: input voltage 220V ± 10%, operating voltage 6V12V, operating temperature: 0～55 ℃; Storage temperature :-20+80 ℃, humidity: 5～95% nothings are condensed power consumption (no external equipment) :+6V0.5A (representative value); Water temperature detection range :-20-120 ℃; 30 tunnel input and output I/O interfaces, 10 road expansion I/O interfaces, system has higher expandability.Control centre has that response speed is fast, high accuracy, high stability, antijamming capability is strong, the function expansion is convenient, simple to operate, and the operating voltage of broad is arranged, and when power down, also can automatically reset to restart or the like advantage and be used widely and approve.
Variable frequency drives is selected for use has high integration; Can be well and PLC, man-machine interface supporting; Easy to operate simple, fault rate is low, reliable and cost performance high product; Native system is considered the stable operation of systematic function when selecting with this variable frequency drives, selected for use than the also more higher leveled product of motor same level.According to design, the use experience of past to frequency conversion system, the starting current of normal electrical motivation is 6 to 7 times of normal running current, but owing to receive the influence of a series of irresistible factors such as quality and degree of aging of environment temperature, temperature, motor; Starting current will be bigger than normal in normal starting current; Running current is also bigger than normal to continue the normal operative condition that operation does not influence whole system in rated current (being can continue to use when surveying insulaion resistance greater than 2 megohms) though can normally start sometimes, and overladen operation then can be shortened the life-span of variable frequency drives greatly; And starting current is during greater than normal starting current; Variable frequency drives can think that load has fault to get into guard mode, and this will influence user's use, for guaranteeing the reliable and stable of work; Durable in use, so select with other variable frequency drives of big one-level.
Pressure transmitter: faint analog signal receives the influence of external electromagnetic easily, and Rosemount China Inc.'s ROSEMOUNT3051 Digital Pressure Transducer has temperature, zero-bit automatic compensation function, to sensor output signal tracking sampling at any time; Stable performance, antijamming capability are strong, structure design is compact light and handy, and precision is high, reliable, the on-the-spot long service life of working stability advantages such as (5 years with upward stabilities), are fit to the place of general vibrations.
Intelligent PID controller is an external, and hydraulic pressure is easy to adjust simple, and pressure monitoring is directly perceived.
This intelligent frequency-conversion constant pressure water supply system has automatic operation mode and manual work pattern.
1, automatic operation mode: promptly move (parameter can be revised) with the mode of operation of system default setting.Energising start operation, system carries out initialization, and initialization finishes; At first control centre detects the water storage tank water level situation automatically; When if water storage tank water level does not reach designated water level, control centre will stop to carry out further work, and panel shows the low water stage exsiccosis simultaneously; If water storage tank water level meets setting value; Control centre further detects the storage tank water temperature again; If the storage tank temperature does not reach requirement, control centre will stop to carry out further work, and panel shows the low situation of storage tank water temperature simultaneously; This function prevents that hot-water supply system from carrying the water source do not reach the requirement water temperature to the user, also reduces the loss of unnecessary mechanical wear of pump group and electric energy on the other hand; If storage tank temperature and water level all meet the setting requirement, and satisfy start and move start-up time, the PLC transmitting system startup command of control centre; PLC starts the dish valve earlier; Start and finish to restart variable frequency drives, variable frequency drives drive motors pump group is to the user delivering hot water; Pressure transmitter detects ductwork pressure simultaneously; Carry out giving the PID adjuster after the A/D conversion to detected pressure signal and carry out the PID computing, the show value among this moment display PV---.---begins to rise, and constantly trends towards the target pressure value among the SV---.---that the user sets.When the target pressure value of pressure in the grid and user's setting matches (be among the PV---.---show value and the show value among the SV---.---match); The output frequency of variable frequency drives just can be stablized; Be the responding system reaction speed; Operation result is directly controlled the variable frequency drives output frequency and removed to control electric-motor pump group rotating speed, and is minimum to guarantee the ductwork pressure fluctuation; The return water temperature control device also detects return water temperature in real time in addition, and when control centre detected return water temperature arrival setting value, control centre sent to PLC and closes the order of backwater electromagnetic valve; PLC closes the backwater electromagnetic valve; Stop backwater, reduce the same pressure that advances then to have increased pipe network of pipe network water flow, for guaranteeing the constant of pressure; The PID adjuster then further reduces the output frequency of variable frequency drives again, is equivalent to further practice thrift the energy again; When return water temperature was reduced to the lower limit temperature of setting, control centre opened the backwater electromagnetic valve again and continues backwater, guaranteed that the pipe network temperature is also constant; This moment, system got into normal operating condition, and is normally in service, if when water storage tank water level or water temperature are lower than setting value, system can interrupt run, recovers normally to start once more until water level or water temperature; When the water supply volume increase, when a water pump had satisfied not the water requirement, system then opened another water pump additional mechanical supercharging again, to guarantee constant pressure; Because having designed the two variable frequency drives of double pump drives; Basically can meet consumers' demand during the full-load run of list pump, just substantially exceed the maximum urban water demand of user during double pump full-load run, if all full-load run of double pump; Can't reach requirement at the appointed time; Then system can think that pipe network is out of order, and system is with interrupt run, and this fault occurring needs manual work to restart; Under the normal operation; If certain pump group (for guaranteeing that each pump group has identical mechanical wear and identical life-span, pump group meeting cycle alternation moves the autobalance pump operation time during design) breaks down; System can open another pump group automatically and continue operation; Send sound and light alarm simultaneously, wait for that the maintenance personal handles, farthest reduce influence the user.
2, manual work pattern: manual work pattern is mainly emergent and convenient debugging, maintenance, safeguards and use.After getting into manual work pattern, can open wherein certain pump group arbitrarily or open in the lump, but power frequency start, do not limit start-up time.
This intelligent frequency-conversion constant pressure water supply system has the following advantages:
1, energy-efficient: the remarkable advantage of constant pressure water supply system is exactly a saves energy, and amount of energy saving is usually 1%～40%.Energy-conservation from the separate unit water pump, flow is more little, and amount of energy saving is big more.
2, constant pressure water supply: the intelligent frequency-conversion constant pressure water supply system has realized that systematic Water supply pressure is stable and flow can change on a large scale continuously; Thereby can guarantee the user whenever use water pressure, can not appear at the situation that water use peak phase user's hot water can not normally use.
3, automatic operation, convenient management: the intelligent frequency-conversion constant pressure water supply system in this project has possessed overcurrent, overvoltage, under-voltage, the phase failure, short-circuit protection, instantaneous power-off protection, overload, stall protection; Low liquid level protection, control of water pump time in turn and soft starter for motor etc., perfect in shape and function; Automatic Control; Automatically operation, the pump house position of not posting a sentry only need send someone to make regular check on, maintain.
4, frequent outage phenomenon be can easily deal with, equipment life, protection system and the stabilization of power grids prolonged.Because frequency conversion system has the outage memory function; Running status before system is in sudden power in the running status, and system can preserve and cut off the power supply when sending a telegram here next time; System recovers the preceding running status of cutting off the power supply automatically, and again the energising after 3 minutes in system can recover normal water supply.In addition; After using frequency converter, the rotating speed of water pump no longer is the operation of long term maintenance rated speed, has reduced mechanical wear; Reduced the water pump fault rate; And main pump time in turn control function self-timing rotates the main pump operation, guarantees that each pump wearing and tearing is even and stainless dead, prolonged motor and water pump application life.The stepless speed regulation operation of frequency converter has realized the pump soft start, and the big electric current when having avoided the motor start-stop has been eliminated the water hammer effect of water pump to the impact of motor winding and electrical network, greatly water pump, pipeline and the accessory in the limit protection hot water system.
5, take up an area of less, the investment payback time is short: intelligent frequency-conversion constant pressure water supply system direct installation vertical pump on the storage tank delivery port; As long as lay one to two switch board between control, volume is very little, and whole system is taken up an area of very little; Can reduce investment outlay; Reduce the operational management expense, add the energy-conservation advantage of variable frequency water supply, determined that all the investment payback time of constant pressure water supply system is short.
6, social benefit is good: the application economic and social benefit of intelligent frequency-conversion water system is tangible; Technical advantage also is tangible; Especially have by a relatively large margin economize on electricity, water-saving result, these its economic results in society for the national conditions of China's water, electric resources wretched insufficiency also are quite huge.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (6)
1. intelligent frequency-conversion constant pressure water supply system; Comprise hot water circuit mechanism; Said hot water circuit mechanism comprises storage tank, electric-motor pump group, user side, and said storage tank, electric-motor pump group and user side form hot-water return through pipeline, it is characterized in that; Also comprise control centre, PID adjuster, variable frequency drives and pressure transmitter, said control centre is connected with said PID adjuster; Said pressure transmitter detects the webmaster pressure data of said hot water circuit mechanism, and pressure data is carried out sending to said PID adjuster after the A/D conversion; Said PID adjuster is proofreaied and correct adjustment and PID computing to pressure data, and the PID operation result is fed back to said variable frequency drives; Said variable frequency drives is controlled said electric-motor pump group according to PID operation result output frequency, minimizes with the fluctuation that reaches webmaster pressure; Said control centre comprises programmable logic controller and singlechip microprocessor, and said programmable logic controller and singlechip microprocessor interconnect, and said programmable logic controller is handled switching value logical operation control; Said singlechip microprocessor is handled the supervision of the normal operation of weak signal and system.
2. intelligent frequency-conversion constant pressure water supply system according to claim 1; It is characterized in that; Pipeline between said user side and the said storage tank is provided with the return water temperature control device, and said return water temperature control device is connected with said control centre, and said return water temperature control device sends to said control centre with return water temperature; Said control centre is according to the operation of return water temperature adjusting heat pump water-heating machine unit, and said heat pump water-heating machine unit is connected with said storage tank.
3. intelligent frequency-conversion constant pressure water supply system according to claim 2; It is characterized in that; Said storage tank is connected with said control centre; Said storage tank is provided with the temperature detection device, and said storage tank sends to control centre with the storage tank temperature, and said control centre is according to the operation of storage tank adjustment heat pump water-heating machine unit.
4. intelligent frequency-conversion constant pressure water supply system according to claim 1 is characterized in that, also comprises touch-screen, and said touch-screen is connected with said control centre, and said touch-screen is for realizing the man-machine communication interface to the operation of said control centre.
5. intelligent frequency-conversion constant pressure water supply system according to claim 1 is characterized in that, said control centre is provided with automatic operational module and manual work module.
6. intelligent frequency-conversion constant pressure water supply system according to claim 1 is characterized in that, said control centre is provided with outage reminiscence module, preserves and reply the preceding running status of outage.
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| CN102776921A (en) * | 2012-07-24 | 2012-11-14 | 柳州高新区欧亚自动化设备有限责任公司 | Control device and control method for overbottom pressure and water storage of pipe network of tap water pressurizing pump station |
| CN102929305A (en) * | 2012-10-29 | 2013-02-13 | 北京金自能源科技发展有限公司 | Variable-frequency speed adjustment technique-based Bang-Bang+PID (Piping and Instrument Diagram) constant pressure water supply closed-loop control method |
| CN103277900A (en) * | 2013-06-24 | 2013-09-04 | 江苏天舒电器有限公司 | Programmable logic controller (PLC) based monitor and control generated system (MCGS) heat pump monitoring system and control method thereof |
| CN104121700A (en) * | 2013-04-23 | 2014-10-29 | 珠海格力电器股份有限公司 | Variable frequency water heater and control method and device thereof |
| CN105334794A (en) * | 2015-11-09 | 2016-02-17 | 重庆金鑫智慧科技有限公司 | Intelligent building management system |
| CN117891206A (en) * | 2024-03-15 | 2024-04-16 | 福州智水匠数字科技有限公司 | Energy-saving pump set operation control system integrating pipe network model intelligent algorithm |
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| CN105334794A (en) * | 2015-11-09 | 2016-02-17 | 重庆金鑫智慧科技有限公司 | Intelligent building management system |
| CN117891206A (en) * | 2024-03-15 | 2024-04-16 | 福州智水匠数字科技有限公司 | Energy-saving pump set operation control system integrating pipe network model intelligent algorithm |
| CN117891206B (en) * | 2024-03-15 | 2024-05-28 | 福州智水匠数字科技有限公司 | Energy-saving pump set operation control system integrating pipe network model intelligent algorithm |
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Application publication date: 20120711 |