CN102383462A - Frequency conversion constant-pressure water supply system - Google Patents
Frequency conversion constant-pressure water supply system Download PDFInfo
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- CN102383462A CN102383462A CN2011102111679A CN201110211167A CN102383462A CN 102383462 A CN102383462 A CN 102383462A CN 2011102111679 A CN2011102111679 A CN 2011102111679A CN 201110211167 A CN201110211167 A CN 201110211167A CN 102383462 A CN102383462 A CN 102383462A
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Abstract
The invention relates to a frequency conversion constant-pressure water supply system belonging to the field of speed control. The frequency conversion constant-pressure water supply system is characterized by being controlled by a PLC (Programmable Logic Controller) to operate; a pressure and a non-electrical quantity signal are converted into a standard current weak current signal in real time through a pressure transmitter and a flow sensor which are arranged on a water discharging manifold; the standard current weak current signal is input to an analog signal input module of the PLC as a system control unit; the signal which is subjected to operation processing of the CPU is compared with a set signal and calculated to obtain an optimal operation condition parameter; the amount of water pumps put into operation in a pump station and the operation condition of a variable pump through a logic control instruction output by an output module of the PLC and a signal value for controlling the output frequency of a frequency converter, and soft starting, soft switching and frequency conversion operation of each water pump are realized according to the indication of the CPU. The system can automatically control the circular operation of the water pumps of a pump set according to the change of water consumption of users at a user terminal so that the stability of the system and the quality of water supply are improved.
Description
Technical field
A kind of constant pressure water supply system belongs to the speed controlling field.
Background technology
The present large-scale tall buildings and the water supply of residential quarters still adopt traditional fixed frequency three phase alternating current motor to drag load mostly, adopt modes such as high level cistern or air pressure tank pressurization.Along with season, round the clock, the influence of changing factor such as time, water supply volume differs greatly, pipe network water pressure is non-constant, supply water and water between uneven.The present invention is exactly the problems referred to above that exist in the prior art in order to solve; Adopted a kind of speed governing constant pressure water supply equipment of PLC+ frequency converter; According to the variation of user terminal user water supply volume, the circular flow of control pump group water pump is with stability that improves system and the quality that supplies water automatically.
Summary of the invention
A kind of constant pressure water supply system belongs to the speed controlling field.It is characterized in that; Native system is by PLC control operation; Pressure transmitter and flow transmitter through being installed on the outfall sewer convert pressure and flow non-electric charge quantity signalling into the normalized current weak electric signal in real time; Be input to the analog signal input module of system control unit-PLC; Signal compares computing with the signal of setting and draws best operation condition parameter after the CPU calculation process, by the signal value control pumping plant of the output module output logic control instruction of PLC and control frequency converter output frequency put into operation the platform number of water pump and the operation condition of variable pump, and realize every water pump is implemented soft start, soft handover and converting operation according to cpu instruction.
Further; Above-mentioned a kind of constant pressure water supply system, wherein, described enforcement electric machine soft starting is meant that motor all slowly quickens starting through frequency converter by 0～50Hz; Reduced the influence that pump is brought because of high-speed starting suddenly, and during across-the-line starting starting current to the impact of electrical network.
Further, above-mentioned a kind of constant pressure water supply system, wherein, described enforcement electric machine soft starting has realized that hydraulic pressure controls automatically, the amount of being conditioned is regulated stably, has strengthened the stability and the reliability of system.
Further, above-mentioned a kind of constant pressure water supply system wherein, is furnished with monitoring system in the described water system, and convenient for installation and maintenance, stable, reliable, monitoring system is multiple functional, and man-machine interface is friendly, and is easy to use.
Description of drawings
The object of the invention, advantage and characteristics will make an explanation through following preferred embodiment commercial affairs non-limitative illustration.These embodiment only are the prominent examples of using technical scheme of the present invention, everyly take to be equal to replacement or equivalent transformation and the technical scheme of row, all within the scope that the present invention requires to protect.
The specific embodiment
A kind of constant pressure water supply system belongs to the speed controlling field.It is characterized in that; Native system is by PLC control operation; Pressure transmitter and flow transmitter through being installed on the outfall sewer convert pressure and flow non-electric charge quantity signalling into the normalized current weak electric signal in real time; Be input to the analog signal input module of system control unit-PLC; Signal compares computing with the signal of setting and draws best operation condition parameter after the CPU calculation process, by the signal value control pumping plant of the output module output logic control instruction of PLC and control frequency converter output frequency put into operation the platform number of water pump and the operation condition of variable pump, and realize every water pump is implemented soft start, soft handover and converting operation according to cpu instruction.
The control system by the rotating speed of Frequency Converter Control water pump to regulate output; According to the difference of water supply volume, rotating speed difference, operating frequency that frequency converter is regulated water pump are also just different, and upper limiting frequency of setting and lower frequency limit detect in frequency converter is provided with; When water supply volume is big; Frequency converter rises to upper limiting frequency rapidly, and at this moment, switching signal of frequency converter output is given PLC; When water was in ebb, frequency converter output reached lower frequency limit, and frequency converter is also exported a switching signal and given PLC; Two signals can not produce simultaneously.When producing any one signal; Signal promptly feeds back to PLC; PLC realizes switching the A.C. contactor group through the output that the internal processes of setting drives I/O port switch amount, with this pump motor platform number of coordinating to devote oneself to work, and the switching of start and stop, frequency conversion and the power frequency of completion motor.Through adjustment motor platform number of devoting oneself to work and the frequency conversion rotating speed of controlling a motor in the group of motors, make the operating pressure all-the-time stable of system pipe network, and then reach the purpose of constant pressure water supply.
The present invention is a kind of typical Automatic Constant-pressure Water Supplying System, has control of pump outlet header constant pressure, unsteady flow amount water supply function.System converts pressure and flow non-electric charge quantity signalling into the normalized current weak electric signal in real time through pressure transmitter and the flow transmitter that is installed on the outfall sewer; Be input to the analog signal input module of system control unit-PLC; Signal compares computing with the signal of setting and draws best operation condition parameter after the CPU calculation process; By the signal value control pumping plant of the output module output logic control instruction of PLC and control frequency converter output frequency put into operation the platform number of water pump and the operation condition of variable pump, and realize every water pump is implemented soft start, soft handover and converting operation according to cpu instruction.System can be according to the variation of user terminal user water supply volume, and the circular flow of control pump group water pump is with stability that improves system and the quality that supplies water automatically.
Cost of the present invention is low, and can better controlled waste, the problem such as energy consumption is big when causing insufficient pressure and low discharge because of floor is too high of water resource, have higher social value and market potential.
Claims (4)
1. constant pressure water supply system; Belong to the speed controlling field; It is characterized in that; Native system is by PLC control operation; Pressure transmitter and flow transmitter through being installed on the outfall sewer convert pressure and flow non-electric charge quantity signalling into the normalized current weak electric signal in real time, are input to the analog signal input module of system control unit-PLC, and signal compares computing with the signal of setting and draws best operation condition parameter after the CPU calculation process; By the signal value control pumping plant of the output module output logic control instruction of PLC and control frequency converter output frequency put into operation the platform number of water pump and the operation condition of variable pump, and realize every water pump is implemented soft start, soft handover and converting operation according to cpu instruction.
2. a kind of constant pressure water supply according to claim 1 system; It is characterized in that: described enforcement electric machine soft starting is meant that motor all slowly quickens starting through frequency converter by 0～50Hz; Reduced the influence that pump is brought because of high-speed starting suddenly, and during across-the-line starting starting current to the impact of electrical network.
3. a kind of constant pressure water supply according to claim 1 system is characterized in that: described enforcement electric machine soft starting has realized that hydraulic pressure controls automatically, and the amount of being conditioned is regulated stably, has strengthened the stability and the reliability of system.
4. a kind of constant pressure water supply according to claim 1 system, it is characterized in that: be furnished with monitoring system in the described water system, convenient for installation and maintenance, stable, reliable, monitoring system is multiple functional, and man-machine interface is friendly, and is easy to use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102111679A CN102383462A (en) | 2011-07-27 | 2011-07-27 | Frequency conversion constant-pressure water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102111679A CN102383462A (en) | 2011-07-27 | 2011-07-27 | Frequency conversion constant-pressure water supply system |
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| Publication Number | Publication Date |
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| CN102383462A true CN102383462A (en) | 2012-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2011102111679A Pending CN102383462A (en) | 2011-07-27 | 2011-07-27 | Frequency conversion constant-pressure water supply system |
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| CN (1) | CN102383462A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981424A (en) * | 2012-11-27 | 2013-03-20 | 新疆大全新能源有限公司 | Output control method, device and control system |
| CN103088872A (en) * | 2013-02-01 | 2013-05-08 | 天津大学 | Water supplying system for flow device |
| CN111219600A (en) * | 2020-01-02 | 2020-06-02 | 温州大学 | Flow detection method of parallel variable-frequency constant-pressure water supply system based on Newton iteration |
| CN112609773A (en) * | 2021-01-04 | 2021-04-06 | 薛金山 | Remote operation parameter regulating and controlling method for constant-pressure water supply system application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19701671A1 (en) * | 1997-01-18 | 1998-07-23 | Mannesmann Rexroth Ag | Drive unit for hydraulic pump supplying variable loads, especially pressure injection moulding machines |
| CN201166939Y (en) * | 2008-03-18 | 2008-12-17 | 温州职业技术学院 | Constant pressure water-supply teaching real-training apparatus |
| CN102116043A (en) * | 2009-12-31 | 2011-07-06 | 上海东方泵业(集团)有限公司 | Frequency conversion constant-pressure water supply system and control method thereof |
-
2011
- 2011-07-27 CN CN2011102111679A patent/CN102383462A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19701671A1 (en) * | 1997-01-18 | 1998-07-23 | Mannesmann Rexroth Ag | Drive unit for hydraulic pump supplying variable loads, especially pressure injection moulding machines |
| CN201166939Y (en) * | 2008-03-18 | 2008-12-17 | 温州职业技术学院 | Constant pressure water-supply teaching real-training apparatus |
| CN102116043A (en) * | 2009-12-31 | 2011-07-06 | 上海东方泵业(集团)有限公司 | Frequency conversion constant-pressure water supply system and control method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981424A (en) * | 2012-11-27 | 2013-03-20 | 新疆大全新能源有限公司 | Output control method, device and control system |
| CN103088872A (en) * | 2013-02-01 | 2013-05-08 | 天津大学 | Water supplying system for flow device |
| CN111219600A (en) * | 2020-01-02 | 2020-06-02 | 温州大学 | Flow detection method of parallel variable-frequency constant-pressure water supply system based on Newton iteration |
| CN111219600B (en) * | 2020-01-02 | 2021-05-04 | 温州大学 | Flow detection method of parallel variable-frequency constant-pressure water supply system based on Newton iteration |
| CN112609773A (en) * | 2021-01-04 | 2021-04-06 | 薛金山 | Remote operation parameter regulating and controlling method for constant-pressure water supply system application |
| CN112609773B (en) * | 2021-01-04 | 2022-06-28 | 薛金山 | Remote operation parameter regulating and controlling method for constant-pressure water supply system application |
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Application publication date: 20120321 |
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