CN203795530U - Variable-frequency constant-pressure water supply fuzzy control system based on PLC - Google Patents
Variable-frequency constant-pressure water supply fuzzy control system based on PLC Download PDFInfo
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- CN203795530U CN203795530U CN201420082007.8U CN201420082007U CN203795530U CN 203795530 U CN203795530 U CN 203795530U CN 201420082007 U CN201420082007 U CN 201420082007U CN 203795530 U CN203795530 U CN 203795530U
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Abstract
The utility model discloses a variable-frequency constant-pressure water supply fuzzy control system based on a PLC. The variable-frequency constant-pressure water supply fuzzy control system based on the PLC comprises the PLC, a water storage system, a water pump unit, a sensing system and a frequency converter. The water storage system comprises a solenoid valve and a water storage pool which are connected with a water supply pipe. The sensing system comprises a water level sensor and a pressure transmitter. The water storage pool is connected with the water pump unit. The input end of the solenoid valve is connected with the output end of the PLC. The output end of the water level sensor and the output end of the pressure transmitter are both connected with the input end of the PLC. The input end of the water pump unit is connected with the output end of the frequency converter, and the input end of the frequency converter is connected with the output end of the PLC. Through the variable-frequency constant-pressure water supply fuzzy control system based on the PLC, a variable-frequency constant-pressure control technology can be provided for water supply systems of high-rises, residential communities and suburb enterprises, the water pressure adjustment is smooth in the changing process, the system fluctuation resistance is high, the water supply systems can be made to run in the best working state, energy is saved, the service life of water pumps is prolonged, and reliability of water supply is guaranteed.
Description
Technical field:
The utility model relates to frequency conversion constant voltage control system field, relates in particular to specifically a kind of constant pressure water supply Fuzzy control system based on PLC.
Background technology:
At present, in water-supply systems, also have a lot of high buildings, biotope, Bian Jiao enterprise etc. to adopt high-order water tower or direct water pump pressurization way of supplying water, motor oepration at full load in the time that water supply volume is large, can shut down or be switched to dry running state in water supply volume hour, this situation consumes a large amount of electric energy on the one hand, has caused the waste of the energy; Because water supply volume has very large randomness, traditional approach is difficult to keep its real-time in the time that water fluctuates on the other hand; For this situation, the utility model proposes the constant pressure water supply Fuzzy control system based on PLC, fuzzy control technology is applied in the control procedure of system, adopt PLC to control and ac variable speed technology, and a kind of PLC of utilization trapezoidal pattern programming language proposed in the realization of control algolithm realize the new method of fuzzy control, thoroughly replaced high-order water tower or direct water pump pressurization way of supplying water, the construction of the system that serves a town with water has proposed a new way that has popularization, applies.
Utility model content:
The purpose of this utility model is to provide a kind of constant pressure water supply Fuzzy control system based on PLC, can carry out frequency conversion and unvarying pressure control technology for the water system of high building, biotope Ji Bianjiao enterprise, not only hydraulic pressure adjustment changes steadily, anti-system fluctuation ability is strong, and can make water system run on optimum Working.
In order to solve the existing problem of background technology, the utility model is by the following technical solutions:
A kind of constant pressure water supply Fuzzy control system based on PLC, comprise PLC controller, water storage system, water pump assembly, sensor-based system and frequency converter, water storage system comprises the electromagnetic valve and the reservoir that are connected with feed pipe, sensor-based system comprises level sensor and pressure transmitter, described reservoir is connected with water pump assembly, electromagnetic valve input is connected with PLC controller output end, level sensor, pressure transmitter output is all connected with PLC controller input, water pump assembly input is connected with inverter output terminal, frequency converter input is connected with PLC controller output end.
Between described feed pipe and outlet pipe, be connected with flap valve.
Described water pump assembly comprises 3 water pumps, and described water pump assembly two ends are provided with control valve.
Described PLC controller is Mitsubishi FX2N-48MR programmable logic controller.
Its operating principle is: constant pressure water supply refers to the don't work size of the water yield of user segment, total pipe network water pressure substantially constant that keeps, so both can meet the user at each position to the demand of water, do not make again motor idle running cause the waste of electric energy, the utility model is when after PLC controller control inverter start up for this reason, by pressure transmitter collection outlet hydraulic signal, compare with pressure set points, through fuzzy reasoning computing, show that controlling value changes the output frequency of frequency converter, water pump is carried out to speed governing operation, to maintain the constant of hydraulic pressure, level sensor is used for detecting the water level in pond, when water level is during lower than lower limit water level, PLC controller sends instructions and opens electromagnetic valve, to pond water filling, when water level is during higher than upper limit water level, the PLC controller shut electromagnetic valve that sends instructions, stop to reservoir water filling, according to the difference of water supply volume, PLC controller carries out different control to water pump assembly, and in order to extend the application life of water pump, allow the periodic duty in every 2 hours of 3 water pumps, avoid water pump not use for a long time and get rusty.
The beneficial effects of the utility model:
The utility model can carry out frequency conversion and unvarying pressure control technology for the water system of high building, biotope Ji Bianjiao enterprise, not only hydraulic pressure adjustment changes steadily, anti-system fluctuation ability is strong, and can make water system run on optimum Working, energy conservation, extend the application life of water pump, the reliability of assure feed water.
Brief description of the drawings:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the utility model water pump assembly control main circuit diagram.
Fig. 3 is the utility model water pump assembly pump switching flow figure.
Fig. 4 is the utility model PLC I/O connection layout.
Wherein: 1, feed pipe, 2, electromagnetic valve, 3, level sensor, 4, PLC controller, 5, pressure transmitter, 6, frequency converter, 7, water pump assembly, 8, outlet pipe, 9, reservoir, 10, flap valve, 11, control valve, 12, water storage system, 13, sensor-based system, 14, start button, 15, frequency converter, 16, RJ relay, 17, water pump, 18, pressure setting input unit, 19, water supply starting switch, 20, water supply shutdown switch, 21, low water stage starting drive, 22, high water level starting drive.
Detailed description of the invention:
Referring to accompanying drawing, a kind of constant pressure water supply Fuzzy control system based on PLC, comprise PLC controller 4, water storage system 12, water pump assembly 7, sensor-based system 13 and frequency converter 15, water storage system 12 comprises the electromagnetic valve 2 and the reservoir 9 that are connected with feed pipe, sensor-based system 13 comprises level sensor 3 and pressure transmitter 5, described reservoir 9 is connected with water pump assembly 7, electromagnetic valve 2 inputs are connected with PLC controller 4 outputs, level sensor 3, pressure transmitter 5 outputs are all connected with PLC controller 4 inputs, water pump assembly 7 inputs are connected with frequency converter 6 outputs, frequency converter 6 inputs are connected with PLC controller 4 outputs.
When PLC controller 4 is controlled after frequency converter 6 startings, gather outlet hydraulic signal by pressure transmitter 5, compare with pressure set points, through fuzzy reasoning computing, show that controlling value changes the output frequency of frequency converter 6, water pump is carried out to speed governing operation, to maintain the constant of hydraulic pressure, level sensor 3 is used for detecting the water level of reservoir 9, when water level is during lower than lower limit water level, PLC controller 4 sends instructions and opens electromagnetic valve 2, to pond water filling; When water level is during higher than upper limit water level, PLC controller 4 shut electromagnetic valve 2 that sends instructions, stops to reservoir water filling; PLC controller 4 also can complete the switching of water pump assembly 7 simultaneously, shown in handoff procedure accompanying drawing, when beginning, PLC controller 4 sends instructions and makes M1 variable frequency starting, when rotating speed rises to 50Hz with frequency from 0Hz, if hydraulic pressure is still lower than setting value, after time delay a period of time (to avoid instantaneous disturbance signal), send instructions and make M1 enter power frequency operation, make M2 variable frequency starting (frequency is dropped rapidly to 0Hz from 50Hz) simultaneously; As hydraulic pressure does not still reach requirement, repeat said process and start M3; Equally; during if any 2 (or 3) pump operations; hydraulic pressure is higher than setting value; M2 (or M3) converting operation drops to 0Hz, if hydraulic pressure is still high, after time delay a period of time, sends instructions M2 (or M3) is shut down; frequency converter 6 frequencies rise to 50Hz from 0Hz rapidly; and making M1 (or M2) stop power frequency operation and drop into converting operation, this switching mode can make hydraulic pressure reach smooth transition, can not make high-rise user occur cutting off the water in short-term phenomenon.
Claims (2)
1. the constant pressure water supply Fuzzy control system based on PLC, it is characterized in that: comprise PLC controller, water storage system, water pump assembly, sensor-based system and frequency converter, water storage system comprises the electromagnetic valve and the reservoir that are connected with feed pipe, sensor-based system comprises level sensor and pressure transmitter, described reservoir is connected with water pump assembly, electromagnetic valve input is connected with PLC controller output end, level sensor, pressure transmitter output is all connected with PLC controller input, water pump assembly input is connected with inverter output terminal, frequency converter input is connected with PLC controller output end.
2. a kind of constant pressure water supply Fuzzy control system based on PLC according to claim 1, is characterized in that: described water pump assembly comprises 3 water pumps, and described water pump assembly two ends are provided with control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082007.8U CN203795530U (en) | 2014-02-26 | 2014-02-26 | Variable-frequency constant-pressure water supply fuzzy control system based on PLC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082007.8U CN203795530U (en) | 2014-02-26 | 2014-02-26 | Variable-frequency constant-pressure water supply fuzzy control system based on PLC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203795530U true CN203795530U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420082007.8U Expired - Fee Related CN203795530U (en) | 2014-02-26 | 2014-02-26 | Variable-frequency constant-pressure water supply fuzzy control system based on PLC |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196088A (en) * | 2014-09-09 | 2014-12-10 | 江南大学 | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof |
| CN105178395A (en) * | 2015-08-01 | 2015-12-23 | 江苏双益给排水有限公司 | Water supply/drainage system |
| CN105256859A (en) * | 2015-09-15 | 2016-01-20 | 苏州艾克威尔科技有限公司 | Water level and water pressure control method |
| CN108643278A (en) * | 2018-06-22 | 2018-10-12 | 安徽机电职业技术学院 | A kind of energy-saving Township water supply system and its water-supply control |
| CN108708435A (en) * | 2018-07-16 | 2018-10-26 | 红塔烟草(集团)有限责任公司 | A kind of frequency conversion water supply facility and method of central water supply system |
| CN109162912A (en) * | 2018-09-10 | 2019-01-08 | 贵州省水利水电勘测设计研究院 | A kind of water plug monitoring and control method and system |
| CN114753451A (en) * | 2022-05-16 | 2022-07-15 | 重庆金越水务有限公司 | Constant-pressure water supply system and method for low, medium and high floors |
-
2014
- 2014-02-26 CN CN201420082007.8U patent/CN203795530U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196088A (en) * | 2014-09-09 | 2014-12-10 | 江南大学 | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof |
| CN105178395A (en) * | 2015-08-01 | 2015-12-23 | 江苏双益给排水有限公司 | Water supply/drainage system |
| CN105178395B (en) * | 2015-08-01 | 2017-04-05 | 江苏双益给排水有限公司 | A kind of supply and drain water system |
| CN105256859A (en) * | 2015-09-15 | 2016-01-20 | 苏州艾克威尔科技有限公司 | Water level and water pressure control method |
| CN108643278A (en) * | 2018-06-22 | 2018-10-12 | 安徽机电职业技术学院 | A kind of energy-saving Township water supply system and its water-supply control |
| CN108708435A (en) * | 2018-07-16 | 2018-10-26 | 红塔烟草(集团)有限责任公司 | A kind of frequency conversion water supply facility and method of central water supply system |
| CN109162912A (en) * | 2018-09-10 | 2019-01-08 | 贵州省水利水电勘测设计研究院 | A kind of water plug monitoring and control method and system |
| CN114753451A (en) * | 2022-05-16 | 2022-07-15 | 重庆金越水务有限公司 | Constant-pressure water supply system and method for low, medium and high floors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20150226 |
|
| EXPY | Termination of patent right or utility model |