CN103016322A - Water pump/fan energy-saving device - Google Patents
Water pump/fan energy-saving device Download PDFInfo
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- CN103016322A CN103016322A CN2011102813794A CN201110281379A CN103016322A CN 103016322 A CN103016322 A CN 103016322A CN 2011102813794 A CN2011102813794 A CN 2011102813794A CN 201110281379 A CN201110281379 A CN 201110281379A CN 103016322 A CN103016322 A CN 103016322A
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Abstract
The invention discloses a water pump/fan energy-saving device, comprising a starting unit and an output unit, wherein a water pump motor unit and a variable frequency processing unit are arranged between the starting unit and the output unit in order; the water pump motor unit comprises multiple water pump motors; multiple lines corresponding to the multiple water pump motors are arranged on the water pump unit; the multiple lines are connected with the starting unit and the variable frequency processing unit respectively; a central control unit is connected with the variable frequency processing unit; and the variable frequency processing unit is connected with the starting unit in a feedback way. Through the way, the water pump/fan energy-saving device can be convenient to use and easy to switch in the occurrence of a fault so that the system is maintained to operate in a most energy-saving state; the water pump/fan energy-saving device has an automatic energy-saving control function and can automatically adjust voltage according to loads so as to enable the motors to operate in a highest efficiency state; and in addition, the electrical structure is optimized, so that the electrical control is simpler, more stable and more economical and the comprehensive power saving rate reaches above 25%.
Description
Technical field
The present invention relates to the energy saving device field, particularly relate to a kind of energy-saving device for water pump fan.
Background technique
Chemical industry, cement production enterprise are the major power consumers during national economy is produced, and chemical industry, cement industry have been listed in one of major fields that country economizes on resources.Propose in the State Council to improve economizing type manufacturing and the application level of chemical industry under the policy environment of Accelerate Conservation-minded Society Construction, it is significant to set up economizing type cement industry system.In the situation that energy imbalance between supply and demand is given prominence to outside Present Domestic, chemical industry, cement industry must reduce energy consumption by all means, to obtain best economic benefit and the highest labour productivity.It is nearly 30% that the motor load power consumption just accounts for cost in chemical industry, the manufacture of cement, and the high-tension motor that water pump is used occupies very large proportion in motor.In use, water pump, blower fan are fixed on for a long time under the maximum rotating speed and move.Because season, round the clock with the variation of production status, actual amount of water, air quantity demand are low more than design (calculated) load within the overwhelming majority times; In the situation that rotating speed is fixed, when the water yield (air quantity) of water pump, blower fan is superfluous, can only control by valve, so just cause the serious waste of power consumption, have certain realistic meaning so water pump, the blower fan in chemical industry, cement plant carried out variable frequency energy saving reforming.
The water pump consumption of prior art accounts for the overwhelming majority of total energy consumption (except electrolysis energy consumption), and the most of power of water pump is (a cover high-pressure water pump 250KW/6000V) more than 55KW, comprising circulation alkali pump, dechlorination light salt brine pump, salt solution middle groove pump, washing water pump, waterback pump, hot water pump, water supply pump etc.Most of water pump valve aperture has certain surplus, the valve opening that has even be lower than 1/3, and the economize on electricity situation is obvious, and variable ratio frequency changer is transformed power probably about 1500KW altogether.Because on-the-spot water pump is apart from dynamic Control chamber distance, so when the frequency variator type selecting, all strengthen the one-level type selecting, the demand of controlling to satisfy site technique.
For the operating conditions of above-mentioned water pump, also there is following shortcoming in it:
1, water pump adopts the soft initiator starting, and starting current is 3 times of rated current, plays certain reduced-voltage starting, but electric current is still very large, and can not speed governing.
2, the motor working efficiency of water pump is low, and local power factor is low.
3, automaticity is not high, and the adjusting of the water yield causes certain waste by on-the-spot throttle valve manual tune.
4, the water pump water yield is controlled by valve, has certain surplus, but at present motor can not speed governing, still with power frequency operation, causes certain energy dissipation.
5, when water consumption has deviation, be difficult in time adjust valve, can't according to actual used water amount water yield adjusting, cause the waste of the energy.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of energy-saving device for water pump fan, can realize the function of automation control, without heavy current impact, and the water pump long service life, the integrated power-saving rate reaches more than 25%.
For solving the problems of the technologies described above, the technological scheme that the present invention adopts is: a kind of energy-saving device for water pump fan is provided, comprise: start unit, output unit, the pump motor unit, the frequency-conversion processing unit, central unit, be provided with successively the pump motor unit between described start unit and the output unit, described frequency-conversion processing unit, described pump motor unit comprises a plurality of pump motors, corresponding described a plurality of pump motors are provided with many circuits and are connected with the frequency-conversion processing unit with start unit respectively on the described water pump unit, described central unit is connected with described frequency-conversion processing unit, described frequency-conversion processing unit and described start unit feedback link.
In a preferred embodiment of the present invention, described pump motor unit comprises main water pump motor and secondary pump motor.
In a preferred embodiment of the present invention, described pump motor unit comprises a main water pump motor and two secondary pump motors.
In a preferred embodiment of the present invention, also be provided with pressure sensing cell between described central unit and the frequency-conversion processing unit.
In a preferred embodiment of the present invention, described central unit comprises a frequency reducing computing unit.
In a preferred embodiment of the present invention, the corresponding pump motor of described output unit unit comprises a plurality of outlet lines.
In a preferred embodiment of the present invention, described central unit is programmable controller.
In a preferred embodiment of the present invention, described frequency-conversion processing unit is the MM430 Series Frequency Converter.
In a preferred embodiment of the present invention, the power of the pump motor in the described pump motor unit is 200 kilowatts.
In a preferred embodiment of the present invention, described start unit is soft initiator.
The invention has the beneficial effects as follows: major and minor pump each other between the pump motor of the present invention, the convenient use can be switched when breaking down easily, and the system of keeping operates in the most energy-conservation state; The frequency-conversion processing unit has the automatic energy saving control function, can according to the loading condition automatic regulating voltage, motor be operated under the peak efficiency state; Optimized electrical structure, more stable so that electrical control is simpler, more economical, the integrated power-saving rate reaches more than 25%.
Description of drawings
Fig. 1 is the structural representation of a kind of energy-saving device for water pump fan one preferred embodiment of the present invention;
Fig. 2 is the energy-saving principle schematic representation of a kind of energy-saving device for water pump fan of Fig. 1;
Fig. 3 is the energy-saving constant-volume analysis chart of a kind of energy-saving device for water pump fan of Fig. 1;
The mark of each parts is as follows in the accompanying drawing: 1, start unit, 2, output unit, 3, the pump motor unit, 4, the frequency-conversion processing unit, 5, central unit, 6, the main water pump motor, 7, secondary pump motor, 8, pressure sensing cell, 9, circuit one, 10, circuit two, 11, circuit three, 12, the hydraulic pressure of water pump under constant rotational speed-water yield characteristic curve, 13, the pipe network water pressure characteristic curve, 14, characteristic curve behind the increase resistance of pipe system, 15, use the characteristic curve of valve control mode, 16, use the characteristic curve of frequency variator mode, 17, energy-saving effect, H, pressure, Q, the water yield, P, required drive, A, operating point originally, B, C, new operating point.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that protection scope of the present invention is made more explicit defining.
See also Fig. 1, the embodiment of the invention comprises:
A kind of energy-saving device for water pump fan comprises: start unit 1, output unit 2, pump motor unit 3, frequency-conversion processing unit 4, central unit 5.
Be provided with successively pump motor unit 3, described frequency-conversion processing unit 4 between described start unit 1 and the output unit 2, described pump motor unit 3 comprises a plurality of pump motors, corresponding described a plurality of pump motors are provided with many circuits and are connected with the frequency-conversion processing unit with start unit 1 respectively and are connected on the described water pump unit, and wherein start unit 1 is soft initiator.
Inrush current is 1/10 of rated current, without heavy current impact, has improved simultaneously power factor, can reach more than 0.9, has reduced no power waste.Optimized electrical structure, more stable, more economical so that the electrical control of energy-saving device for water pump fan is simpler, the integrated power-saving rate reaches more than 25%.
The working procedure of pump motor unit 3 being carried out frequency-conversion processing is: one 200 kilowatts main water pump motor 6 is wherein carried out VFC, and other two 200 kilowatts pump motor is in holding state; When ductwork pressure maintains the pressure of default and frequency variator when certain tuning range is arranged, other reserve pump of two 200 kilowatts is not worked; After system pressure was lower than the low pressure of setting and frequency variator and is in the full load operation, system carried out variable frequency starting to a reserve pump motor automatically, reduces simultaneously the operation frequency of First main water pump motor 6, operates in the most energy-conservation state to keep system.
The MM430 Series Frequency Converter that frequency-conversion processing unit 4 adopts SIEMENS to produce.This frequency variator has the automatic energy saving control function, can according to the loading condition automatic regulating voltage, motor be operated under the peak efficiency state.The system pressure wave range is between 0.01-0.02MPA.
Wherein, the detection of the runnability of system pressure and frequency variator is all finished by central unit 5, and described central unit 5 is connected with described frequency-conversion processing unit 4, described frequency-conversion processing unit 4 and described start unit 1 feedback link.Described central unit 5 comprises a frequency reducing computing unit.Also be provided with pressure sensing cell 8 between described central unit 5 and the frequency-conversion processing unit 4.
Pressure by described pressure sensing cell 8 detection systems, and send information to central unit 5, frequency-conversion processing unit 4 also is connected with described central unit 5, send the runnability information of frequency variator to central unit 5, central unit 5 according to pressure after testing the information of unit and frequency-conversion processing unit 4 judge whether to continue to use the pump motor that is moving.If information is all normal, central unit 5 sends signal to frequency-conversion processing unit 4, normal output, and information is fed back to start unit 1, continue the pump motor that operation is moving.If information occurs unusual, 5 feedback informations of central unit are to frequency-conversion processing unit 4, by frequency-conversion processing unit 4 send start the reserve pump motor signal to start unit 1, and reduce the operation frequency of the pump motor that is moving by the frequency reducing computing unit.
Whole system manually, automatically optional, also can carry out remote monitoring, simple to operate, control is reliable, and is directly perceived.The mode of telecontrol is to adopt decentralized control system, but Real Time Monitoring is to the running state of energy-saving device for water pump fan of the present invention.
Energy-saving device for water pump fan employing frequency variator of the present invention is controlled pump motor, belongs to the hydrodynamic method of saving electric power of minimizing, and the method that it and general accent valve commonly used are controlled the water yield compares, and has obvious power savings.
Consult Fig. 2 its electricity principle can be described:
Among the figure, 12 is hydraulic pressure one water yield (H-Q) characteristic curve of water pump under constant rotational speed n1, and 13 is the pipe network water pressure characteristic curve, and this moment, valve was standard-sized sheet.
It is the highest to suppose that pump motor is operated in the A point efficiency, and this moment, pressure was H2, and the water yield is Q1, and air horsepower N1 is directly proportional with the product of Q1, H2, and usable area AH2OQ1 represents in the drawings.If manufacturing technique requirent, the water yield need to reduce to Q2 from Q1, and at this moment the method with regulating valve is equivalent to increase resistance of pipe system, makes the resistance of pipe system characteristic change to curve 14, and system changes to new operating point B operation by original operating point A.As seen from the figure, hydraulic pressure increases on the contrary, and air horsepower is directly proportional with area B H1OQ2.Obviously, air horsepower descends little.If adopt the speed govornor by frequency modulator mode, pump rotary speed drops to n2 by n1, in the situation according to the water yield Q2 of parameters of pump, and hydraulic pressure H3 decrease, power N3 is along with remarkable minimizing, and CH3OQ2 represents with area.The power Δ N=(H1-H3) that saves * Q2, H1H3C represents with area B.Obviously, energy-conservation economic effect is fairly obvious.
By fluid mechanics as can be known, water consumption is directly proportional with the first power of rotating speed, square being directly proportional of pressure H and rotating speed, and air horsepower N is directly proportional with the cube of rotating speed.Adopt frequency variator to carry out speed governing, when water consumption drops to 80%, rotating speed also drops to 80%, and air horsepower N will drop to 51.2% of rated power, if water consumption drops to 60%, air horsepower N can drop to 21.6% of rated power, certainly also needs to consider because the effectiveness affects of the Efficiency Decreasing that the rotating speed reduction can cause and additional control gear etc.Therefore even like this, this energy-saving digital also is very considerable, in the machinery that blower fan, water pump are housed, adopts the rotating speed control mode to regulate air quantity or the water yield, energy-conservation be an effective method.
Consult Fig. 3 and can do following quantitative calculating:
Design conditions:
Power of motor: 200KW, be 8000h running time between year;
Drive manner: the time of 85% water yield Q is 8000h.
Calculated examples:
Use the characteristic curve 15 of valve control mode:
When water yield Q was 85%, required drive P was 91% * 200KW=182KW;
Electric weight: 182 * 8000=1456000KWh between year.
Use the characteristic curve 16 of frequency variator mode:
When water yield Q was 85%, required drive P was 61% * 200KW=122KW;
Electric weight: 122 * 8000=976000KWh between year.
The effect of economizing on electricity between year:
1456000KWh-976000KWh＝480000KWh；
1KWh=0.7 unit saves about 330,000 yuan.
Reducing energy consumption motor total output: 200KW.
Reducing energy consumption expense: 180,000 yuan.
The investment repayment time: 7 months.
Power saving rate among the present invention refers to an average power saving rate estimating, is not final power saving rate, and final average power saving rate comprehensively draws according to on-the-spot comparative trial after installing.
The control design all keeps original operation and control system, in order to still can enable at short notice original control system in the situation that electricity-saving appliance system contingency breaks down, guarantees to produce unaffected.
Income after the power-saving Retrofit is comprehensive, and its economic benefit is relevant with service time.Service time is longer, and income is larger.For other potential income, such as the equipment failure cost, cost of equipment maintenance, the comprehensive benefits such as equipment renewal cost and system's increase-volume cost, the statistics by one period just can well be reflected effect.
Major and minor pump each other between the pump motor of the present invention, the convenient use can be switched when breaking down easily, and the system of keeping operates in the most energy-conservation state; Frequency-conversion processing unit 4 has the automatic energy saving control function, can according to the loading condition automatic regulating voltage, motor be operated under the peak efficiency state; Optimized electrical structure, more stable so that electrical control is simpler, more economical, the integrated power-saving rate reaches more than 25%.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. energy-saving device for water pump fan, it is characterized in that, comprise: start unit, output unit, the pump motor unit, the frequency-conversion processing unit, central unit, be provided with successively the pump motor unit between described start unit and the output unit, described frequency-conversion processing unit, described pump motor unit comprises a plurality of pump motors, corresponding described a plurality of pump motors are provided with many circuits and are connected with the frequency-conversion processing unit with start unit respectively on the described water pump unit, described central unit is connected with described frequency-conversion processing unit, described frequency-conversion processing unit and described start unit feedback link.
2. energy-saving device for water pump fan according to claim 1 is characterized in that, described pump motor unit comprises main water pump motor and secondary pump motor.
3. energy-saving device for water pump fan according to claim 2 is characterized in that, described pump motor unit comprises a main water pump motor and two secondary pump motors.
4. energy-saving device for water pump fan according to claim 1 is characterized in that, also is provided with pressure sensing cell between described central unit and the frequency-conversion processing unit.
5. energy-saving device for water pump fan according to claim 1 is characterized in that, described central unit comprises a frequency reducing computing unit.
6. energy-saving device for water pump fan according to claim 1 is characterized in that, the corresponding pump motor of described output unit unit comprises a plurality of outlet lines.
7. energy-saving device for water pump fan according to claim 1 is characterized in that, described central unit adopts programmable controller.
8. energy-saving device for water pump fan according to claim 1 is characterized in that, described frequency-conversion processing unit adopts the MM430 Series Frequency Converter.
9. energy-saving device for water pump fan according to claim 1 is characterized in that, the power of the pump motor in the described pump motor unit is 200 kilowatts.
10. energy-saving device for water pump fan according to claim 1 is characterized in that, described start unit is soft initiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102813794A CN103016322A (en) | 2011-09-21 | 2011-09-21 | Water pump/fan energy-saving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102813794A CN103016322A (en) | 2011-09-21 | 2011-09-21 | Water pump/fan energy-saving device |
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| CN103016322A true CN103016322A (en) | 2013-04-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07279854A (en) * | 1994-04-15 | 1995-10-27 | Kawamoto Seisakusho:Kk | Water supply device |
| CN200979664Y (en) * | 2006-11-13 | 2007-11-21 | 长沙怡能电子科技有限公司 | An intelligent electricity-saving control system for blast and pump |
| CN101403582A (en) * | 2008-11-14 | 2009-04-08 | 沪东重机有限公司 | Automatic temperature control apparatus of large cooling column group |
| JP2010019223A (en) * | 2008-07-14 | 2010-01-28 | Sayama Seisakusho:Kk | Pump flow rate control method and pump flow rate control system |
| CN201428581Y (en) * | 2009-06-29 | 2010-03-24 | 石家庄市大雄电工科技开发有限公司 | Intelligent frequency-variable electricity-saving system with the same main pipe |
| CN201774488U (en) * | 2010-08-20 | 2011-03-23 | 吉林省宇光能源股份有限公司 | Controller of frequency converter of heat exchanger |
| CN202250755U (en) * | 2011-09-21 | 2012-05-30 | 常州苏控自动化设备有限公司 | Energy-saving device for water pump fan |
-
2011
- 2011-09-21 CN CN2011102813794A patent/CN103016322A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07279854A (en) * | 1994-04-15 | 1995-10-27 | Kawamoto Seisakusho:Kk | Water supply device |
| CN200979664Y (en) * | 2006-11-13 | 2007-11-21 | 长沙怡能电子科技有限公司 | An intelligent electricity-saving control system for blast and pump |
| JP2010019223A (en) * | 2008-07-14 | 2010-01-28 | Sayama Seisakusho:Kk | Pump flow rate control method and pump flow rate control system |
| CN101403582A (en) * | 2008-11-14 | 2009-04-08 | 沪东重机有限公司 | Automatic temperature control apparatus of large cooling column group |
| CN201428581Y (en) * | 2009-06-29 | 2010-03-24 | 石家庄市大雄电工科技开发有限公司 | Intelligent frequency-variable electricity-saving system with the same main pipe |
| CN201774488U (en) * | 2010-08-20 | 2011-03-23 | 吉林省宇光能源股份有限公司 | Controller of frequency converter of heat exchanger |
| CN202250755U (en) * | 2011-09-21 | 2012-05-30 | 常州苏控自动化设备有限公司 | Energy-saving device for water pump fan |
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Application publication date: 20130403 |