CN102477755A - Constant pressure water supply variable frequency system - Google Patents
Constant pressure water supply variable frequency system Download PDFInfo
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- CN102477755A CN102477755A CN2010105586849A CN201010558684A CN102477755A CN 102477755 A CN102477755 A CN 102477755A CN 2010105586849 A CN2010105586849 A CN 2010105586849A CN 201010558684 A CN201010558684 A CN 201010558684A CN 102477755 A CN102477755 A CN 102477755A
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Abstract
The invention relates to a water supply system, in particular to a constant pressure water supply variable frequency system. In the system, the water pressure is stabilized in a constant state by using single closed-loop PID (Proportion Integration Differentiation) control, which is formed by PID control, a programmable controller and a water pressure sensor in a frequency inverter; meanwhile, a variable frequency pump is continuously operated in the whole experiment process; because the power of the pump used in the experiment is smaller, the water pressure is stabilized at 0.1 Mpa; meanwhile, a 24V direct current power supply of the frequency converter is adopted as a driving power supply of the water pressure sensor; a feedback signal of the sensor is 4-24 mA direct current; the constant pressure water supply variable frequency system is characterized in that the frequency of the variable frequency pump is increased when the water usage of the system is increased because control is adopted in a variable frequency cabinet and modularization is adopted for the programme; a high frequency signal is sent to PLC (Programmable Logic Controller) by using the frequency converter when the frequency is higher than working frequency 50 HZ; and a signal is generated for a power frequency pump to operate after the PLC is delayed for 2 min. The water usage is slowly reduced, a low frequency signal is sent to the PLC by the frequency converter when the frequency is lower than low limit frequency of the frequency converter, and a signal is generated for the power frequency pump to operate after the PLC is delayed for 3 min.
Description
Technical field
The present invention relates to a kind of water system, particularly a kind of constant pressure water supply frequency conversion system.
Background technology
Generally speaking domestic water equipment, can be divided into two kinds of basic patterns, is referred to as matched and non-matched.
The characteristics of non-matched supply equipment are the outputs of water pump, always greater than the water supply volume of system.Need the configuration water storage device, like water tower, high level cistern etc., so that unnecessary water or whole water are temporarily stored.When the water that stores, when reaching high water level, water pump shuts down, and at this moment, is supplied water to water system by accumulator.When the water in the accumulator was used low water stage, water pump played the trend water storage device once more and supplies water.
The characteristics of matched supply equipment are that the output of water pump changes along with the variation of water supply volume, do not have the unnecessary water yield, and water storage devices such as high level cistern are not set.Early stage water pump direct supply type water supply system is exactly a kind of original matched supply equipment.But because the speed of water pump can not be regulated, hydraulic pressure sharply changes with the variation of water supply volume.When water supply volume was very little, hydraulic pressure was very high, and water application efficiency is very low, and is neither energy-conservation, makes the hydraulic pressure of system unstable again.Replaced by the matched water system gradually.
In recent years because electronic technology and computer-controlled develops rapidly and the enhancing day by day of awareness of saving energy, the application of RHVC more and more widely, RHVC begins in industry and civilian water system, to be applied.Through computer controlled automatic, change the frequency of supply of pump motor, regulate the rotating speed of water pump; The output of automatically controlled water pump is to guarantee that output changes when water supply volume changes thereupon; Thereby the pressure of keeping water system is constant, has realized the mutual coupling of output and water supply volume.Become perfectly matched supply equipment.It has saved high level cistern, and is promptly energy-conservation also without air pressure tank, saves building area again.
Summary of the invention
The present invention to above-mentioned defective, proposes a kind of constant pressure water supply frequency conversion system just.On the economize on electricity problem of double pump frequency-conversion water supply system, generally can take 4 kinds of schemes: 1. frequency conversion main pump+power frequency is assisted pump; 2. frequency conversion main pump+power frequency is assisted pump+air pressure tank; 3. frequency conversion main pump+air pressure tank; 4. the auxilliary pump of frequency conversion main pump+frequency conversion sees that from energy-conservation, investment angle the 4th kind of scheme is more suitable.Two pumps supplies water, and is applicable to that water supply volume is little, and reliability of water supply requires not too high place; Be particularly useful for providing for oneself the enterprises and institutions of well, original water pump capable of using and pipe network, engineering quantity is little; Instant effect can make the reliable and stable operation of water system, and is energy-conservation again.In the two pumps any one can be by inverter supply, also all can directly supply power full speed running for any one by electrical distribution system.With PID adjuster and the Controlled by Programmable Controller that frequency converter carries, the hydraulic pressure of water circuit system is maintained within a certain range.
This system controls through the PID that frequency converter had, programmable logic controller, and hydraulic pressure sensor, the three forms single closed loop PID control, makes stable water pressure in steady state, and simultaneously, variable frequency pump is at the whole experiment continuous service; Because the power of experiment institute use pump is less, so stable water pressure utilizes the driving power of the 24V dc source of frequency converter as hydraulic pressure sensor simultaneously at 0.1Mpa, and the feedback signal of sensor is 4～24mA DC current; It is characterized in that: frequency conversion tank adopts control, and program adopts modularization, and when the system water amount increased, the variable frequency pump frequency raise, and when frequency was higher than power frequency 50HZ, frequency converter sent high-frequency signal and gives PLC, and the PLC 2min that delays time provides signal general pump is turned round.When water supply volume slowly reduces, frequency is lower than the frequency converter lower frequency limit, and frequency converter sends low frequency signal and gives PLC, and the PLC 3min that delay time provides the running of signal shutoff general pump.
Description of drawings
Fig. 1 water system control section wiring diagram
Fig. 2 water supply installation control flow
The specific embodiment
Native system is mainly controlled through the PID that frequency converter had, programmable logic controller, and hydraulic pressure sensor, the three forms single closed loop PID control, makes stable water pressure in steady state, and simultaneously, variable frequency pump is at the whole experiment continuous service.Because power less (lift 15m, the flow 4m of experiment institute use pump
3/ h, power 0.55kw), so stable water pressure utilizes the driving power of the 24V dc source of frequency converter as hydraulic pressure sensor simultaneously at 0.1Mpa, and the feedback signal of sensor is 4～24mA DC current.
At first with digitally the linking to each other with simulation ground of frequency converter, promptly the 24G of frequency converter end links to each other with the AIC end, with the positive pole of 24V output point water receiving pressure sensor, negative pole is inserted the AV of frequency converter again
2Port (PID feedback terminal) is formed closed-loop control.It should be noted that the parameter P-163:PID feedback signal with frequency converter is chosen as 0 this moment, i.e. voltage input effectively.The setting of frequency converter major parameter can see the following form
Table 3-1 converter parameter is provided with table
Then utilize the multimachine ability lead-out terminal R of frequency converter
1AR
IC(often opening) inserted the I of PLC
1Input R
2AR
2B(often opening) inserted the I of PLC
2Input is simultaneously with the Q of PLC
1, Q
2, Q
3, Q
4Output inserts respectively in the control loop of two pumps, carries out the start and stop control of double pump.Figure is as shown in Figure 1 for the control system wiring.
Frequency conversion tank adopts control, and program adopts modularization, and design system PLC control flow is seen Fig. 2.When the system water amount increased, the variable frequency pump frequency raise, and when frequency was higher than power frequency 50HZ, frequency converter sent high-frequency signal and gives PLC, and the PLC 2min that delay time provides signal general pump is turned round.When water supply volume slowly reduces, frequency is lower than the frequency converter lower frequency limit, and frequency converter sends low frequency signal and gives PLC, and the PLC 3min that delay time provides the running of signal shutoff general pump.
Domestic water supplying system adopts frequency-changing water supply device can improve water supply quality; And automaticity is high, is again national energy-conservation disseminate technology, but if select improper use; Can cause electric energy " waste " again; Therefore advise that designer and user should consider according to combined factors such as water character, water characteristics, water scale, equipment investments before scheme is confirmed, guaranteeing to give full play to the energy-saving potential of frequency control under the reliable water supply prerequisite.
Claims (1)
1. constant pressure water supply frequency conversion system, this system is through the PID control that frequency converter had, programmable logic controller, hydraulic pressure sensor, the three forms single closed loop PID control, makes stable water pressure in steady state, and simultaneously, variable frequency pump is at the whole experiment continuous service; Because the power of experiment institute use pump is less, so stable water pressure utilizes the driving power of the 24V dc source of frequency converter as hydraulic pressure sensor simultaneously at 0.1Mpa, and the feedback signal of sensor is 4～24mA DC current; It is characterized in that: frequency conversion tank adopts control, and program adopts modularization, and when the system water amount increased, the variable frequency pump frequency raise, and when frequency was higher than power frequency 50HZ, frequency converter sent high-frequency signal and gives PLC, and the PLC 2min that delays time provides signal general pump is turned round.When water supply volume slowly reduces, frequency is lower than the frequency converter lower frequency limit, and frequency converter sends low frequency signal and gives PLC, and the PLC 3min that delay time provides the running of signal shutoff general pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105586849A CN102477755A (en) | 2010-11-25 | 2010-11-25 | Constant pressure water supply variable frequency system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105586849A CN102477755A (en) | 2010-11-25 | 2010-11-25 | Constant pressure water supply variable frequency system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102477755A true CN102477755A (en) | 2012-05-30 |
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ID=46090526
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105586849A Pending CN102477755A (en) | 2010-11-25 | 2010-11-25 | Constant pressure water supply variable frequency system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452886A (en) * | 2014-10-27 | 2015-03-25 | 南充市大禹水务科技有限责任公司 | Integrated different-quality water supply system |
| CN105971864A (en) * | 2016-07-05 | 2016-09-28 | 池泉 | Pump set drive system |
-
2010
- 2010-11-25 CN CN2010105586849A patent/CN102477755A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452886A (en) * | 2014-10-27 | 2015-03-25 | 南充市大禹水务科技有限责任公司 | Integrated different-quality water supply system |
| CN104452886B (en) * | 2014-10-27 | 2017-01-18 | 南充市大禹水务科技有限责任公司 | Integrated different-quality water supply system |
| CN105971864A (en) * | 2016-07-05 | 2016-09-28 | 池泉 | Pump set drive system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120530 |