CN1098463A - Optimum variable pressure and flow water supply system - Google Patents
Optimum variable pressure and flow water supply system Download PDFInfo
- Publication number
- CN1098463A CN1098463A CN 93109204 CN93109204A CN1098463A CN 1098463 A CN1098463 A CN 1098463A CN 93109204 CN93109204 CN 93109204 CN 93109204 A CN93109204 A CN 93109204A CN 1098463 A CN1098463 A CN 1098463A
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- Prior art keywords
- flow
- variable pressure
- pressure
- optimum variable
- water supply
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Abstract
The invention discloses a kind of optimum variable pressure and flow hydrotechny and system with obvious energy saving effect.This system is by frequency converter, and programmable logic controller and optimum variable pressure and flow adjuster constitute, and the variable pressure and flow model signal that produces with this system goes the outlet pressure of control of pump unit to reach the purpose of optimum variable pressure and flow.
Description
The present invention relates to a kind of improved water system.This system is by the high power transistor frequency converter, and industrial programmable logic controller and optimum variable pressure and flow adjuster constitute, and is the electromechanical integration integrated system of the pump motor unit being carried out the control of optimum variable pressure and flow closed loop pressure.Particularly a kind of water system with obvious energy saving effect.
Adjust in the constant-pressure variable water system in frequency conversion, exit of pump was to the pipeline loss sum decision of least favorable point when the constant voltage value was depth of building and maximum water supply volume.Pipeline loss and flow meet H
Decrease=KQ
2(also claiming characteristic curve of pipeline).In real work, water pump assembly is operated in the medium and small water yield in the most of the time, so exit of pump pressure only needs H=H
0+ KQ
2, constant-pressure variable supplies water and exceeds Δ H=K(Q than actual required pressure
2 m-Q
2), Q wherein
mMaximum stream flow for constant pressure water supply.As shown in Figure 1, the shade I is the energy-conservation zone that constant pressure water supply is compared with the constant speed water supplying pump among the figure, the shade II is exactly can further energy-conservation zone, for simple water supply network (as single building, single not end) can directly adopt terminal constant voltage promptly pressure sensor to be installed in end, pressure signal be passed to the variable frequency control cabinet carry out constant voltage control.General pipe network has a plurality of ends, and least favorable point changes the position with the variation with water load, can all adorn pressure sensor at several ends in theory, gathers pressure signal simultaneously and is sent to the variable frequency control cabinet, does terminal constant voltage control to select least favorable point.This kind scheme or cost height, technical difficulty is big, is not suitable for large-scale promotion.Other uses as two manostatic techniques fire-fighting sharing system that is suitable for living.Can produce two kinds of possible pressure in a certain flow section, and energy-saving effect is not remarkable.The control of multistage constant voltage is difficult to realize because of there being problems such as debugging and system works stability.
Detect the purpose that can realize variable pressure and flow on the flow signal principle if at water pump group delivery port flow meter is installed, but because flow meter price height, pipeline needs problem such as particular design and Installation and Debugging and is difficult to promote.
Task of the present invention is that a kind of improved frequency modulation water supply technology and system with obvious energy saving effect will be provided.It can be installed and debug easily, has the mounting condition identical with existing constant pressure water supply system, is convenient to make its upgrading.
It is by frequency converter that system of the present invention constitutes, and programmable logic controller and variable pressure and flow adjuster are formed, and is the electromechanical integration integrated system of pump motor being carried out the control of optimum variable pressure and flow closed loop pressure.Regulate the rotating speed of variable frequency pump and the water pump platform number that puts into operation according to the transient change of water pump assembly outlet pressure and flow, make its outlet pressure reach the optimization transformation.Significantly improve water application efficiency and energy-saving effect under the water prerequisite satisfying.
The key of control system of the present invention is variable pressure and flow model signal and produces and the how rotating speed of control of pump and the platform number of the water pump that puts into operation.For centrifugal water pump, lift H, flow Q and frequency f (rotating speed) meet H ∞ f, Q ∞ f
2Relation is Q ∞ f
2Substitution H=H
0+ KQ
2Get H=H
0+ KQ
2=H
0+ k ' f
4The maximum H of lift when maximum stream flow
m, H
0For high constructure height in the zone of supplying water, so just can determine K '=1/f
4 m(H
m-H
0); f
m=50Hz(or 60Hz).With H=H
0+ K ' f
4As transformation control model signal, by PLC and comparison of variable pressure and flow adjuster and computing, produce the start stop signal of a PID speed controling signal and other pump, regulate water pump assembly and exit of pump pressure and model signal are matched reach the purpose of optimum variable pressure and flow energy saving water supply.
The running of water pump assembly switches soft-start mode with circulation.When variable frequency pump turn up 50Hz and pressure are lower than the model signal, enabling signal triggers this variable frequency pump (being with by frequency converter) and switches to power frequency, restart time platform pump after frequency converter is deviate from and regulate its rotating speed and reach new stable state, when reducing to make the variable frequency pump rotating speed, flow drops to critical frequency, termination of pumping signal cut running time the longest general pump, so just can control 2～N platform water pump, withdraw from principle earlier by work earlier and realize circulation switching soft start runner mode.
The present invention compares with existing constant-pressure variable hydrotechny, and the considerable energy saving advantage is arranged, and has the potentiality of large-scale promotion.Now make an example, when the pipeline loss is H-Max 50%, and in cycle time (24 hours) under the prerequisite of equalization running time (Δ Q/ Δ t=constant) of each flow the present invention compare with manostatic technique 25% energy-saving potential arranged.If in 24 hours 12 hours by night low discharge or zero delivery calculate and to be expected to have an appointment 50% energy-saving potential.Therefore the present invention has 25-50% considerable energy saving potentiality.
Claims (2)
1, optimum variable pressure and flow water-supply control.This method key is to produce a transformation model signal according to the frequency converter output frequency, and calculates-the PID speed controling signal with this.
2, by what frequency converter, programmable logic controller and optimum variable pressure and flow adjuster constituted pump motor is carried out the electromechanical integration water system that optimum variable pressure and flow is controlled by what claim 1 was stipulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109204 CN1098463A (en) | 1993-08-03 | 1993-08-03 | Optimum variable pressure and flow water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109204 CN1098463A (en) | 1993-08-03 | 1993-08-03 | Optimum variable pressure and flow water supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1098463A true CN1098463A (en) | 1995-02-08 |
Family
ID=4987527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93109204 Pending CN1098463A (en) | 1993-08-03 | 1993-08-03 | Optimum variable pressure and flow water supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1098463A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269978A (en) * | 2010-06-07 | 2011-12-07 | 上海熊猫机械(集团)有限公司 | Time interval optimizing water supply controller |
| CN103154518A (en) * | 2011-04-11 | 2013-06-12 | 富士电机株式会社 | Water supply pump control device |
| CN103266646A (en) * | 2013-05-14 | 2013-08-28 | 江苏大学 | Variable frequency variable pressure water supply implementation method and variable frequency variable pressure water supply implementation device |
-
1993
- 1993-08-03 CN CN 93109204 patent/CN1098463A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269978A (en) * | 2010-06-07 | 2011-12-07 | 上海熊猫机械(集团)有限公司 | Time interval optimizing water supply controller |
| CN103154518A (en) * | 2011-04-11 | 2013-06-12 | 富士电机株式会社 | Water supply pump control device |
| CN103154518B (en) * | 2011-04-11 | 2015-09-09 | 富士电机株式会社 | Feed water pump control apparatus |
| CN103266646A (en) * | 2013-05-14 | 2013-08-28 | 江苏大学 | Variable frequency variable pressure water supply implementation method and variable frequency variable pressure water supply implementation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |