CN102200121B - Electricity-saving control system leading water pump to run at optimum revolution - Google Patents
Electricity-saving control system leading water pump to run at optimum revolution Download PDFInfo
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- CN102200121B CN102200121B CN 201010131970 CN201010131970A CN102200121B CN 102200121 B CN102200121 B CN 102200121B CN 201010131970 CN201010131970 CN 201010131970 CN 201010131970 A CN201010131970 A CN 201010131970A CN 102200121 B CN102200121 B CN 102200121B
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Abstract
The invention provides an electricity-saving control system leading a water pump to run at an optimum revolution. The system comprises a frequency converter, a flow meter, a comprehensive efficiency test unit, an input unit, a temperature sensor or water level sensor, a running command transmission unit and a halt inspection unit, wherein the comprehensive efficiency test unit sends out a test command to the frequency converter to ensure that the frequency converter controls the water pump to run at different revolutions sequentially; the ratio of water flow rate to consumed electric power of the water pump at different revolutions is calculated according to the water flow rate of the water pump at different revolutions provided by the flow meter, and running current and voltage of the water pump at different revolutions provided by the frequency converter, so that corresponding data of maximum ratio of the water pump revolution to the water flow rate and the electric power is established; and running of the water pump is controlled according to the corresponding data, so that water pump can run at the most economical optimum revolution to realize energy saving.
Description
Technical field
The present invention relates to a kind of system that controls water pump operation, particularly a kind of electricity-saving control system of water pump operation under optimum speed that make.
Background technique
Water pump system can be saved electric energy significantly by variable-frequency control technique, has obtained in recent years using very widely.
The basic formula of water pump system variable-frequency control technique is a closed loop control system, and it regulates the output frequency of frequency variator automatically according to water temperature, water temperature difference, pressure, pressure difference, the isoparametric variation of liquid level, and then changes the rotating speed of pump motor.Owing to leave the certain power surplus during water pump system design, have certain Yang Cheng surplus or flow margin in other words, behind the introducing variable-frequency control technique, the rotating speed of pump motor must have the decline of certain amplitude.According to fluid mechanics principle, pump shaft power is directly proportional with 3 powers of rotating speed, so power savings is very outstanding.
But also there is significant disadvantages in this closed loop control method, Here it is it behind the rotating speed that has reduced water pump, its operation point substantial deviation the maximal efficiency interval of water pump, motor, frequency variator, the overall efficiency of system descends significantly.Because the efficient of water pump, motor, frequency variator and pipe characteristic etc. are that motor speed is relevant with power supply frequency all, see Figure 1A-1D, it is consistent with the actual demand flow that general closed loop control method just drops to pump capacity with motor speed, and do not take all factors into consideration the efficient of water pump, motor, frequency variator and the relation of pipe characteristic and power supply frequency, therefore, can't guarantee that whole system is operated in the efficient the optimum state, so still have very big waste of energy and the energy saving space.The frequency converter power-saving technology of the existing common close-loop control mode of this employing although significant power savings is arranged, remains little after the input of the energy-saving efficiency deduction wholesale that the user obtains.This is unwilling to adopt the frequency conversion power saving technology with regard to the water pump system that causes a lot of users.
Therefore, how fully taking into account each links such as the efficient of water pump, motor, frequency variator and pipe characteristic influences power savings, how further to improve power saving rate, use which type of control strategy on earth, saving power is major issue in the energy-conservation research of water pump system always to greatest extent.
Summary of the invention
The object of the present invention is to provide a kind of electricity-saving control system of water pump operation under optimum speed that make, with energy saving to greatest extent.
Reach other purposes in order to achieve the above object, the electricity-saving control system of water pump operation under optimum speed that make provided by the invention comprises: frequency variator; Be installed on the pipeline that is connected with described water pump and be used for the flowmeter of the described ducted water flow of metering; With described frequency variator, the overall efficiency test cell that flowmeter is connected, be used for sending test instruction to described frequency variator, so that the described water pump of described Frequency Converter Control moves under different rotating speeds in regular turn, and running current and the voltage of described water pump under different rotating speeds that provides at the water flow under the different rotating speeds and frequency variator according to the described water pump that described flowmeter provides, calculate the ratio of described water pump water flow and electric power of consuming under variant rotating speed, obtain the maximum value of described water pump water flow and electric power ratio under variant rotating speed thus, with the corresponding data of the maximum ratio of setting up pump rotary speed and water flow and electric power; Be used for providing an inputting interface so that the user imports the input unit of present flow rate demand information; The temperature transducer or the level sensor that are used for the liquid level of the water outlet of the circulatory system that test links to each other with described water pump and return water temperature or water storage system; The operating instruction issue unit, for the present flow rate demand information that provides according to described input unit, and the corresponding data of the maximum ratio of the pump rotary speed that provides of described overall efficiency test cell and water flow and electric power, determine the current rotating speed that needs operation of described water pump, and further determine operation and the stop time of the current intermittent operation of described water pump according to the information that described temperature transducer or level sensor provide, in order to the current rotating speed of operation and operation and the stop time of the current intermittent operation of described water pump of needing of described water pump provided to described frequency variator, makes described frequency variator can correctly control the operation of described water pump; And be used for providing the halt instruction load button to import halt instruction for the user, and make described operating instruction issue unit send halt instruction so that described Frequency Converter Control water pump shutdown detection unit out of service gradually according to described halt instruction.
Wherein, described flowmeter can be ultrasonic flowmeter; Described temperature transducer can adopt the platinum thermoresistance sensor; Described level sensor can adopt ultrasonic material level meter or radar levelmeter.
Preferably, described flowmeter is connected with described overall efficiency test cell by the RS485 interface; Described overall efficiency test cell is connected with described frequency variator by communication bus.
In sum, the electricity-saving control system of water pump operation under optimum speed that make of the present invention tests out energy consumption minimum value under different rotating speeds by the overall efficiency test cell, controls the rotating speed of water pump accordingly, realizes the saving of the energy thus.
Description of drawings
Figure 1A to 1D is respectively efficiency curve, and the schematic representation that concerns of pipe resistance loss and flow of existing pump rotary speed, motor speed, frequency variator.
Fig. 2 is the basic structure schematic representation that makes the electricity-saving control system of water pump operation under optimum speed of the present invention.
Concern schematic representation between the overall efficiency that Fig. 3 tests out for the overall efficiency test cell that makes the electricity-saving control system of water pump operation under optimum speed of the present invention and the rotating speed.
Fig. 4 is the actual operation curve that makes the electricity-saving control system of water pump operation under optimum speed of the present invention.
Embodiment
See also Fig. 2, the electricity-saving control system of water pump operation under optimum speed that make of the present invention comprises at least: frequency variator, flowmeter, overall efficiency test cell, input unit, temperature transducer or level sensor, operating instruction issue unit and shutdown detection unit etc.
Described frequency variator is used for changing the rotating speed of pump motor, and its structure and working principle be known to those skilled in the art knowing, so be not described in detail in this.
Described flowmeter is installed on the pipeline that is connected with described water pump, is used for the described ducted water flow of metering, and it can be ultrasonic flowmeter.In the present embodiment, adopting model is the flowmeter metering water flow of STG-100, and water flow unit is cubic metre/hour.
Described overall efficiency test cell and described frequency variator, flowmeter is connected, be used for sending test instruction to described frequency variator, so that the described water pump of described Frequency Converter Control moves under different rotating speeds in regular turn, and running current and the voltage of described water pump under different rotating speeds that provides at the water flow under the different rotating speeds and frequency variator according to the described water pump that described flowmeter provides, calculate the ratio of described water pump water flow and electric power of consuming under variant rotating speed, obtain the maximum value of described water pump ratio of water flow and electric power under variant rotating speed thus, corresponding data with the maximum ratio of setting up pump rotary speed and water flow and electric power, it can be connected with described frequency variator by communication bus, is connected with described flowmeter by the RS485 interface.In the present embodiment, the frequency variator automatically controlled water pump moves under different rotating speeds from high to low in order, described overall efficiency test cell records its flow and the electric power that consumes simultaneously, the STG-100 flowmeter measures ducted water flow, described overall efficiency test cell calculates the flow of water in the pipeline and the ratio of the electric power that consumes again, it is exactly the overall efficiency of water pump system, just powered with the soft starting mode water supply pump motor by frequency variator earlier, frequency of supply progressively rises to highest frequency by 0, keep certain hour, the overall efficiency when measuring highest frequency at highest frequency.Then operation frequency is subtracted 1, measure the overall efficiency of the system of this Frequency point again, and once operation frequency is subtracted 1, judge whether operation frequency is lower than the low-limit frequency that system arranges ... when operation frequency is lower than the low-limit frequency of system's setting, the system effectiveness test process just finishes, at this moment it is corresponding mutually with corresponding pump rotary speed with each overall efficiency more to have tested out the overall efficiency of water pump system under different operation frequencies, form one group of data corresponding to different rotating speeds and preserve, as the foundation of control water pump operation.The overall efficiency that present embodiment is measured and rotating speed concern schematic representation as shown in Figure 3, a maximum value is arranged usually.Generally speaking, as long as not variations such as water pump, motor, frequency variator, pipelines, the data of test just can be used for a long time.
Described input unit is used for providing an inputting interface so that the user imports the present flow rate demand information, and certainly, described inputting interface also can comprise other parameter input field, to satisfy requirements of different users.
Described temperature transducer or level sensor are used for testing the water outlet of the circulatory system that links to each other with described water pump and the liquid level of return water temperature or water storage system.Usually, for the water storage system of water tower, wet pit one class, adopt level sensor, for example can adopt US-500 series ultrasonic material level meter or LD series radar levelmeter etc.And for the continuity water circulation system of heat supply, cooling one class, adopt temperature transducer to detect coolant-temperature gage and return water temperature, for example can adopt PT100 type platinum thermoresistance sensor to detect coolant-temperature gage and return water temperature.
Described operating instruction issue unit is for the present flow rate demand information that provides according to described input unit, and the corresponding data of the maximum ratio of the pump rotary speed that provides of described overall efficiency test cell and water flow and electric power, determine the current rotating speed that needs operation of described water pump, and further determine operation and the stop time of the current intermittent operation of described water pump according to the information that described temperature transducer or level sensor provide, in order to the current rotating speed of operation and operation and the stop time of the current intermittent operation of described water pump of needing of described water pump provided to described frequency variator, makes described frequency variator can correctly control the operation of described water pump.For example, for the water storage system for water tower, wet pit one class, when level sensor senses liquid level when dropping to bottom line, described operating instruction issue unit determines that then water pump needs to start immediately, and according to the rotating speed operation of high overall efficiency; And sensing liquid level when being raised to maximum when level sensor, described operating instruction issue unit determines that then water pump need stop immediately.And for heat supply, the cooling one class the continuity water circulation system, described operating instruction issue unit then calculates the poor of water-exit temperature and return water temperature, i.e. " water outlet/backwater temperature difference " is when water outlet/backwater temperature difference is bigger than normal, need to shorten the water pump ratio of dead time, the ratio that prolongs working time; When water outlet/backwater temperature difference is less than normal, need the prolongation ratio of dead time, the ratio that shortens working time.In addition, shut down, the length of operation period, also can determine according to the requirement that the user imports in aforementioned inputting interface, if require temperature stability more high, then need to shut down, the operation period is more short.
Described shutdown detection unit is used for providing the halt instruction load button to import halt instruction for the user, and makes described Frequency Converter Control water pump out of service gradually according to described halt instruction.
The above-mentioned electricity-saving control system workflow of water pump operation under optimum speed that make can be as follows:
The first step, system brings into operation, and it can provide basic service data (mode that provides can be the mode that display screen shows etc.) to the user, and the user is further query-relevant data also, also can arrange, revise relevant parameter etc.
Second step, system judges whether to carry out the step of system effectiveness test, for example, can judge according to the instruction of user's input: if namely user input instruction requires system is carried out the system effectiveness test, then enter the system effectiveness test process, namely send test instruction by described overall efficiency test cell to frequency variator, read the water flow of described ultrasonic flowmeter and running current and the voltage of frequency variator subsequently, and then calculate the maximum value of described water pump ratio of water flow and electric power under variant rotating speed, with the corresponding data of the maximum ratio of setting up pump rotary speed and water flow and electric power; Otherwise system enters judges whether water pump needs the process of moving.
In the 3rd step, judge whether operating procedure: can judge that equally if the operation of i.e. user input instruction requirement system, system namely enters the water pump operation step according to the instruction of user's input; Otherwise system turns back to and reads data, show data, the step of parameter is set.
Water pump operation step: start water pump operation according to the current rotating speed of operation and operation and the stop time of current intermittent operation of needing of determined water pump with the regular hour gap by described operating instruction issue unit.Simultaneously, in the running of water pump, the shutdown detection unit constantly detects the user and whether sends halt instruction, if do not send halt instruction, then keeps water pump to continue operation; Otherwise enter the soft stop step: namely described operating instruction issue unit sends halt instruction described Frequency Converter Control water pump is slowed down gradually up to stopping.
Therefore; at the water pump operation that makes of the present invention under the control of the electricity-saving control system under the optimum speed; water pump has 4 kinds of states (as shown in Figure 4): 1. outage state, 2. the start up period, 3. running state, 4. soft stop stage; in all running statees, water pump all operates near overall efficiency maximum value (f1 is the frequency of supply of overall efficiency curve maximum value correspondence among the figure) eventually.
In sum, the electricity-saving control system of water pump operation under optimum speed that make of the present invention tests out corresponding relation between overall efficiency and the rotating speed by the overall efficiency test cell, thereby make frequency variator that corresponding frequency of supply can be provided, and then make water pump near all running statees all are operated in the overall efficiency maximum value, energy saving to greatest extent.
Above-described embodiment just lists expressivity principle of the present invention and effect is described, but not is used for restriction the present invention.Any personnel that are familiar with this technology all can make amendment to above-described embodiment under spirit of the present invention and scope.Therefore, the scope of the present invention should be listed as claims.
Claims (6)
1. one kind makes the electricity-saving control system of water pump operation under optimum speed, it is characterized in that comprising:
Frequency variator;
Be installed in the flowmeter on the pipeline that is connected with described water pump, be used for the described ducted water flow of metering; With described frequency variator, the overall efficiency test cell that flowmeter is connected, be used for sending test instruction to described frequency variator, so that the described water pump of described Frequency Converter Control moves under different rotating speeds in regular turn, and running current and the voltage of described water pump under different rotating speeds that provides at the water flow under the different rotating speeds and frequency variator according to the described water pump that described flowmeter provides, calculate the ratio of described water pump water flow and electric power of consuming under variant rotating speed, obtain the maximum value of described water pump water flow and electric power ratio under variant rotating speed thus, with the corresponding data of the maximum ratio of setting up pump rotary speed and water flow and electric power;
Input unit is used for providing an inputting interface so that the user imports the present flow rate demand information;
Temperature transducer or level sensor are used for testing the water outlet of the circulatory system that links to each other with described water pump and the liquid level of return water temperature or water storage system;
The operating instruction issue unit, for the present flow rate demand information that provides according to described input unit, and the corresponding data of the maximum ratio of the pump rotary speed that provides of described overall efficiency test cell and water flow and electric power, determine the current rotating speed that needs operation of described water pump, and further determine operation and the stop time of the current intermittent operation of described water pump according to the information that described temperature transducer or level sensor provide, in order to the current rotating speed of operation and operation and the stop time of the current intermittent operation of described water pump of needing of described water pump provided to described frequency variator, makes described frequency variator can correctly control the operation of described water pump;
Shut down detection unit, be used for providing the halt instruction load button to import halt instruction for the user, and make described operating instruction issue unit send halt instruction so that described Frequency Converter Control water pump is out of service gradually according to described halt instruction.
2. the electricity-saving control system of water pump operation under optimum speed that make as claimed in claim 1, it is characterized in that: described flow is counted ultrasonic flowmeter.
3. the electricity-saving control system of water pump operation under optimum speed that make as claimed in claim 1, it is characterized in that: described flowmeter is connected with described overall efficiency test cell by the RS485 interface.
4. the electricity-saving control system of water pump operation under optimum speed that make as claimed in claim 1, it is characterized in that: described overall efficiency test cell is connected with described frequency variator by communication bus.
5. the electricity-saving control system of water pump operation under optimum speed that make as claimed in claim 1 is characterized in that: described temperature transducer employing platinum thermoresistance sensor.
6. the electricity-saving control system of water pump operation under optimum speed that make as claimed in claim 1 is characterized in that: described level sensor employing ultrasonic material level meter or radar levelmeter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010131970 CN102200121B (en) | 2010-03-25 | 2010-03-25 | Electricity-saving control system leading water pump to run at optimum revolution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010131970 CN102200121B (en) | 2010-03-25 | 2010-03-25 | Electricity-saving control system leading water pump to run at optimum revolution |
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| CN102200121A CN102200121A (en) | 2011-09-28 |
| CN102200121B true CN102200121B (en) | 2013-07-17 |
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| CN 201010131970 Expired - Fee Related CN102200121B (en) | 2010-03-25 | 2010-03-25 | Electricity-saving control system leading water pump to run at optimum revolution |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644583B (en) * | 2012-04-21 | 2014-03-05 | 余炳炎 | Pumping device applied to water quality filtering treatment system of culture pond |
| CN102644584B (en) * | 2012-04-21 | 2014-03-05 | 余炳炎 | Water quality filtering treatment method applied to culture pond |
| CN102642983B (en) * | 2012-04-21 | 2014-03-05 | 余炳炎 | Water-quality filtration processing system for culture pond |
| DE102012013774A1 (en) * | 2012-07-11 | 2014-01-16 | Wilo Se | Centrifugal pump with flow meter |
| CN103437987B (en) * | 2013-08-28 | 2016-06-22 | 华南理工大学 | The adaptive frequency conversion pumping system control method of a kind of efficiency |
| CN104564627A (en) * | 2015-01-07 | 2015-04-29 | 杭州林叶电气自动化有限公司 | Power saving device |
| CN110210158B (en) * | 2019-06-11 | 2023-06-06 | 长沙凯仁节能技术有限公司 | Transformation method of energy-saving water pump |
| CN116760330B (en) * | 2023-08-18 | 2023-11-07 | 山东宇飞传动技术有限公司 | Control system for variable frequency control device |
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| EP1630422A2 (en) * | 2004-08-26 | 2006-03-01 | Pentair Pool Products, Inc. | Variable speed pumping system and method |
| CN101033748A (en) * | 2006-03-08 | 2007-09-12 | Itt制造企业公司 | Method for determining pump flow without the use of traditional sensors |
| CN201215099Y (en) * | 2008-04-09 | 2009-04-01 | 明大动力(北京)能源科技有限公司 | Intelligent efficacy energy-conserving end device for blower fan water pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7686589B2 (en) * | 2004-08-26 | 2010-03-30 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280253A (en) * | 1999-07-12 | 2001-01-17 | 丹福斯有限公司 | Method for regulating pump transport volume |
| EP1630422A2 (en) * | 2004-08-26 | 2006-03-01 | Pentair Pool Products, Inc. | Variable speed pumping system and method |
| CN101033748A (en) * | 2006-03-08 | 2007-09-12 | Itt制造企业公司 | Method for determining pump flow without the use of traditional sensors |
| CN201215099Y (en) * | 2008-04-09 | 2009-04-01 | 明大动力(北京)能源科技有限公司 | Intelligent efficacy energy-conserving end device for blower fan water pump |
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| CN102200121A (en) | 2011-09-28 |
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