CN104699129A - Automatic control system for water level of water tower - Google Patents
Automatic control system for water level of water tower Download PDFInfo
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- CN104699129A CN104699129A CN201310683955.7A CN201310683955A CN104699129A CN 104699129 A CN104699129 A CN 104699129A CN 201310683955 A CN201310683955 A CN 201310683955A CN 104699129 A CN104699129 A CN 104699129A
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Abstract
The invention discloses an automatic control system for water level of a water tower. The automatic control system is characterized in that a constant-pressure water supply system utilizes a frequency changer to adjust rotating speed of a water pump to control flow so as to enable the water level of the water tower to remain unchanged. Pressure signals are acquired by a pressure instrument, the frequency changer is controlled by a PLC (programmable logic controller), and the PLC controls switch-in and switch-out of multiple water pumps. The automatic control system has manual and automatic control functions, power frequency emergency running can be realized during a frequency change failure, the frequency changer adopts a one-dragging-four mode, and each motor realizes soft start through the frequency changer, so that electric and mechanical impact is reduced. Switching of power frequency-variable frequency or variable frequency-power frequency of each motor is controlled by the PLC according to water consumption.
Description
Technical field
The present invention relates to water lev el control technical field, be combine machinery, automatic control system that electronics, control technology are integrated.
Background technology
Water supply is an important industry involved the interests of the state and the people.Along with the development of society and the raising of living standards of the people, urban water supply is had higher requirement, meet timely, accurate, the sufficient water supply of safety assurance, if still continue to use manual type, labour intensity is large, inefficiency, security is difficult to ensure, must carry out the transformation of Level Control of Water Towers automated system for this reason.Society now, automation equipment is omnipresent, and under the promotion of control technology demand, control theory itself also achieves significant progress.The monitor and forecast of water tower level, does not again need manually to operate.Facts have proved, automation mechanized operation that there is irreplaceable using value.Auto-controller, has the function of the detection and control adapting to various liquid level, is the product that can drop into actual production.
In the daily productive life of people, often need to control water level, Level Control of Water Towers system is the water system of China's residential quarters widespread use, and traditional control mode exists the shortcoming that control accuracy is low, energy consumption is large, and very unstable.And utilize PLC and sensor to constitute the control system of water tower level, utilize the electric conductivity of water to measure the change of water level continuously round-the-clockly, the SEA LEVEL VARIATION Parameter Switch measured is become corresponding electric signal, master station application MCGS configuration software carries out data processing to the received signal, complete the display of the display of corresponding water level, fault alarm information display, real-time curve and history curve, water level is kept in position, keep water pressure invariableness, thus improve the quality of water system.And cost is low, easy for installation, sensitivity is good.
Summary of the invention
Native system by by PLC, four centrifugal pumps, a composition such as frequency converter, manometer, various circuit monitoring and a warning device.Adopt 16 A.C. contactors, complete start-stop and the task switching of water pump; Adopt the supply of 150VA 380V/220V transformer; Pressure needed for pipe network, automatically implements in the course of work to control the switching of the start-stop control of 1# pump, 2# pump, 3# pump, 4# pump and frequency conversion, power frequency, reaches the object of constant pressure water supply.Native system has manually, automatic control function: under normal condition, automatically run, and ensures constant pressure water supply.In frequency converter or certain fault of water pump situation, directly can carry out the control of power frequency start-stop to another normal water pump, reach Emergency water supply, do not delay the requirement of production.Under automatic mode, four water primings of pump carry out soft start by frequency converter.When frequency converter or fault of water pump, system has warning function.Frequency converter adopts constant pressure water supply frequency conversion one to drag the method for operation of four.
Realize constant pressure water supply with frequency control and PLC, and realize with control valve compared with constant pressure water supply, energy-saving effect is very remarkable.Its advantage is: start steadily, within starting current can be limited in rated current, thus to the impact of electrical network when avoiding starting; Because the mean speed of pump reduces, thus the serviceable life of pump and valve etc. can be extended; Water hammer effect when starting and shut down can be eliminated; In the occasion of boiler with other combusting heavy oils, constant pressure oil supply can make the burning of oil more abundant, alleviates the pollution to environment widely.
Accompanying drawing explanation
Fig. 1 is water system pipe network structure figure;
Fig. 2 is closed loop real-time control system figure;
Fig. 3 is System's composition schematic diagram.
Embodiment
It is to allow whole water supply network pressure be tending towards constant that the water level of water tower controls its basic goal automatically, so the thinking of native system is exactly utilize frequency converter to regulate the rotating speed of water pump to control flow, water tower level is remained unchanged, pressure signal is obtained by manometer, frequency converter is controlled by PLC, and PLC controls the incision of several water pumps and cuts out simultaneously.
Constant pressure water supply system utilizes frequency converter to regulate the rotating speed of water pump to control flow, and water tower level is remained unchanged, and pressure signal is obtained by manometer, and frequency converter is controlled by PLC, and PLC controls the incision of several water pumps and cuts out simultaneously.System has manually, automatic control function, and can implement power frequency emergency operating during frequency conversion fault, frequency converter drags the method for operation of four with one, and each motor all has frequency converter soft start, slow down electrically and physical shock.According to water consumption size, control the power frequency of each motor, frequency conversion or frequency conversion, power frequency switching with PLC.
The switching of native system frequency conversion/power frequency, power frequency/frequency conversion controls, and is not the lead-out terminal signal depending on frequency converter, but inputs PLC by the pressure upper and lower limit signal of the output of manometer, carries out switching and controls.Frequency converter no longer runs on PID pattern, only runs under general mode, the starting and stopping signal that the 4-20mA signal exported according to manometer and PLC export, and " passive operation ", carries out the automatic adjustment of pressure.The quality of system cloud gray model depends on the performance of manometer PID to a greater extent.
By pressure transducer sampling pipe network pressure signal, manometer has excellent PID control performance, exports the 4-20mA current signal with pressure size variation, controls the rotating speed of frequency converter thus carries out fine tuning to ductwork pressure; Manometer goes back the output pressure upper limit and low pressure limit signal simultaneously, is input to PLC, and when low pressure limit signal occurs, and after time delay, PLC control 1# pump is switched to power frequency operation by frequency conversion, simultaneously varying frequency starting 2# pump operation.When low pressure limit signal exists, then successively 2#, 3#, 4# pump is switched to power frequency operation; Upper pressure limit signal occurs, and after time delay, PLC control 1# general pump is shut down.As low pressure limit signal still exists, then cut off general pump successively.The result controlled, makes pipe network pressure energy be maintained at preferably within the scope of setting pressure.
Claims (5)
1. a water tower level automatic control system, it is characterized in that: constant pressure water supply system utilizes frequency converter to regulate the rotating speed of water pump to control flow, water tower level is remained unchanged, the method of operation of four is dragged in frequency converter employing one, and controlled by PLC, the incision that PLC controls several water pumps simultaneously with cut out, according to water consumption size, control the power frequency of each motor, frequency conversion or frequency conversion, power frequency switching with PLC.
2. water tower level automatic control system according to claim 1, is characterized in that, described constant pressure water supply system utilizes frequency converter to regulate the rotating speed of water pump to control flow, and water tower level is remained unchanged.
3. water tower level automatic control system according to claim 1, is characterized in that, described frequency converter adopt one drag four the method for operation, and to be controlled by PLC.
4. water tower level automatic control system according to claim 1, is characterized in that, the incision that described PLC controls several water pumps simultaneously with cut out.
5. water tower level automatic control system according to claim 1, is characterized in that, described PLC, according to water consumption size, controls the power frequency of each motor, frequency conversion or frequency conversion, power frequency switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310683955.7A CN104699129A (en) | 2013-12-09 | 2013-12-09 | Automatic control system for water level of water tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310683955.7A CN104699129A (en) | 2013-12-09 | 2013-12-09 | Automatic control system for water level of water tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104699129A true CN104699129A (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310683955.7A Pending CN104699129A (en) | 2013-12-09 | 2013-12-09 | Automatic control system for water level of water tower |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991510A (en) * | 2015-07-20 | 2015-10-21 | 上海意利法暖通科技有限公司 | One-in-service-one-standby water pump variable frequency electric control system and control method |
| CN105649136A (en) * | 2016-03-17 | 2016-06-08 | 金田集团（桐城）塑业有限公司 | Intelligent energy-saving water supply device applied to BOPP production line |
| CN109339155A (en) * | 2018-09-17 | 2019-02-15 | 三川智慧科技股份有限公司 | A kind of the water tower constant pressure water supply system and method for water pump alternation |
| CN109933114A (en) * | 2019-04-19 | 2019-06-25 | 中国地质科学院水文地质环境地质研究所 | A kind of water table measure and regulator control system |
| CN111759455A (en) * | 2020-06-29 | 2020-10-13 | 上海交通大学 | Bubble suction instrument for electric excision operation |
| CN114056533A (en) * | 2021-12-03 | 2022-02-18 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Variable frequency control system and method for marine main seawater cooling pump |
-
2013
- 2013-12-09 CN CN201310683955.7A patent/CN104699129A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991510A (en) * | 2015-07-20 | 2015-10-21 | 上海意利法暖通科技有限公司 | One-in-service-one-standby water pump variable frequency electric control system and control method |
| CN105649136A (en) * | 2016-03-17 | 2016-06-08 | 金田集团（桐城）塑业有限公司 | Intelligent energy-saving water supply device applied to BOPP production line |
| CN109339155A (en) * | 2018-09-17 | 2019-02-15 | 三川智慧科技股份有限公司 | A kind of the water tower constant pressure water supply system and method for water pump alternation |
| CN109933114A (en) * | 2019-04-19 | 2019-06-25 | 中国地质科学院水文地质环境地质研究所 | A kind of water table measure and regulator control system |
| CN111759455A (en) * | 2020-06-29 | 2020-10-13 | 上海交通大学 | Bubble suction instrument for electric excision operation |
| CN114056533A (en) * | 2021-12-03 | 2022-02-18 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Variable frequency control system and method for marine main seawater cooling pump |
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Application publication date: 20150610 |