CN107448397A - Water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling - Google Patents
Water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling Download PDFInfo
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- CN107448397A CN107448397A CN201610368706.2A CN201610368706A CN107448397A CN 107448397 A CN107448397 A CN 107448397A CN 201610368706 A CN201610368706 A CN 201610368706A CN 107448397 A CN107448397 A CN 107448397A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel
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- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Water pump variable speed energy conservation control method of the invention based on universal flow speed mathematical modeling belongs to water pump variable speed energy conservation and correlation technique, purpose is according to the characteristics of water pump operation, the flow speed mathematical modeling that research and development are adapted with water pump operation operating mode, to realize that water pump dynamic speed controls, main points are influence of the change of research net lift to flow and rotation speed relation, study water pump slewing range, water pump speed change universal flow speed mathematical modeling is built according to the physical characteristic of water pump variable-speed operation operating mode, solve the problems, such as that water pump speed Control is theoretically unsound, utilize water pump system speed change dynamic controller and arrangements for speed regulation, form water pump variable speed energy conservation control system, profound level can be obtained, fine closed-loop dynamic Energy Saving Control, it can be widely applied to the water system of newly-built or transformation all kinds of water pump speed Controls.
Description
Technical field
The invention belongs to water pump variable speed energy conservation and correlation technique.
Background technology
Water pump power consumption accounts for 20% or so of national total electricity consumption, and the energy-conservation of water pump system is to national energy-conservation
The implementation of emission reduction policy has the function that to hold the balance, thus the variable speed energy conservation of water pump is ground as emphasis always
The object studied carefully.
Water Pumps ＆ Fans belongs to asquare torque load equipment, but both also have some differences, water pump system
Net lift generally be present, genetic prerequisite is more unfavorable, so comparing blower fan system in variable speed energy conservation control aspect
It is increasingly complex.Especially because the presence of water pump system net lift, is equally applicable to blower fan and water pump power frequency
Proportionality law during operation, do not apply in water pump variable-speed operation, but also lacked at present in this respect
Necessary theoretical model and associated application technology.Due to no related theoretical foundation, to reality
Engineer applied brings technology blind area, for example, whether proportionality law is also applicable during for water pump speed changeIt is suitable
What condition isWhat inapplicable condition isWhen speed change system is applied to water pump, velocity variations
How scope determinesHow amount of energy saving when variable speed energy conservation is applied is estimatedThe problem of such, goes back at present
There is no theoretical method to carry out quantitative analysis, define.
Whether proportionality law is also applicable during water pump speed changeVery clear and definite knot is not reached also according to prior art
By causing in many variable speed energy conservation applications at present, still habitually proportionally law comes pair people
Variable speed energy conservation system is analyzed, is calculated, controlled and evaluated, and most of results cause and practical operation situation
There is larger difference.It is most to be meant that, be only possible to apply in a special case in practical application
When the net lift of proportionality law, i.e. water pump system is 0.
The reason for same, prior art it is determined that be also theoretically unsound in terms of the slewing range of water pump, because
And the determination slewing range handled very skillfully like that without image of Buddha blower fan system, carry out optimal control for energy saving.Due to
Gear shaper without theoretical can be according to prior art is it is determined that the state of blindness be present, as a result to energy-conservation control in terms of slewing range
Strategy processed generates incorrect guiding.
The gearshift applications of water pump system are away from modern existing more than 30 years history, but speed change related so far is managed
By research still without substantial progress, also it is confined to based on similar parabolical graphical method or based on each
In kind of mathematical statistics regression equation calculation method, no matter and both accuracys, only with regard to practical application
For, graphical method can not be applied in the dynamic control of engineering substantially, and it is various recurrence accounting equation by
In the discreteness that limitation and result of calculation be present, so being also only limited in qualitative or experiment analysis.
The theoretical blank of water pump system speed change seriously limits the application of variable speed energy conservation, and prior art is in water pump
It is more to rely on engineering experience in variable speed energy conservation application, is using so-called voltage control technology, result more
Many spaces are all have lost in terms of the depth of variable speed energy conservation and range.
In view of the foregoing, prior art does not adapt to the demand of water pump variable speed energy conservation application fundamentally,
Theoretical research and application technology urgently have breakthrough.
Method on being carried out water pump variable speed energy conservation control based on universal flow-speed mathematical modeling yet there are no
Publication, document or the data published.
Water pump of the present invention means vane pump and the pump close with blade pump characteristics.
The content of the invention
The purpose of the present invention is according to the characteristics of water pump operation, and research and development are adapted with water pump operation operating mode
Universal flow-speed mathematical modeling, with realize water pump dynamic speed control.
The method is characterized in that influence of the change of research water pump system net lift to flow and rotation speed relation,
Universal flow-speed mathematical modeling is built according to the physical characteristic of water pump variable-speed operation operating mode, with prior art
Research emphasis it is different, prior art research is regression equation on experimental data mathematical statistics,
The presence and conjunction of phenomenon and essence when the emphasis that the present invention studies is water pump variable-speed operation, i.e. physical significance
Rationality, so as to build universal flow-speed mathematical modeling.
Universal flow-speed mathematical modeling during the water pump variable-speed operation that the present invention is built is formula (1).
In formula：
n1：Water pump speed desired value, rpm or Hz
Q1：Water pump present flow rate, m3/s
Qe：Water pump metered flow, m3/s
ne：Water pump rated speed, rpm or Hz
nc：Water pump speed change critical speed, rpm or Hz
Hst：Water pump system net lift, m
Hm：Water pump system total head (lift of the pump characteristic equation when flow is 0),
m
k：Model fitting coefficient, 0~1
Water pump speed change critical speed n in formula (1)cWith net lift Hst, total head HmAnd rated speed ne
Relevant, when rated speed is 50Hz, net lift is arranged the influence result of calculation of water pump speed change critical speed
In table 1.
Influence of the net lift of table 1. to water pump speed change critical speed
Brief description of the drawings
1 is water pump variable rate data information processing and controlling device in accompanying drawing 1, and 2 be production technology main control system
System, 3 be water pump system speed change dynamic controller, and 11 be 1# pump speed control devices, and 12 be 1# pump motors,
13 be 1# water pump system pressure detectors, and 14 be 1# water pump system flow detectors, and n1 is that n# water pumps are adjusted
Speed variator, n2 are n# pump motors, and n3 is n# water pump system pressure detectors, and n4 is n# water pump systems
Flow detector.
1 is net lift H in accompanying drawing 2stFor 0 when flow-tensionvelocity curve, 2 be net lift HstNo
For 0 when, and do not account for pump characteristics Parameters variation, system-head curve Parameters variation shadow during changes in flow rate
Flow-tensionvelocity curve when ringing, 3 be net lift influence curve, and 4 be net lift HstWhen not being 0,
And consider with flow during changes in flow rate when pump characteristics Parameters variation, system-head curve parametric variations-
Tensionvelocity curve.
Embodiment
At present, in the application of water pump variable-speed operation, main theoretical foundation is pump characteristic equation
(2), pipe system performance curve equation (3) and proportionality law formula (4), (5), (6).
In formula：
H1：The current lift of water system, m
a、b、c：Constant
Se：Pipe network frictional resistance during metered flow
n1：Water pump speed desired value, rpm or Hz
Q1：Water pump present flow rate, m3/s
Qe：Water pump metered flow, m3/s
He：Water system rated head, m
ne：Water pump rated speed, rpm or Hz
Hst：Water system net lift, m
N1：Run power, kW
Ne：Rated power, kW
For a specific water pump, a, b, c are the experimental data warps that dispatches from the factory provided according to water pump manufactory
The constant obtained after fitting, wherein c=Hm, so pump characteristic side when formula (2) is rated speed
Journey, it is n in speed according to similarity law when water pump variable-speed operation1When pump characteristic equation
For formula (7).
Formula (3) is pipe system performance curve equation, net lift H in formulastIt is water pump system pipe network during equal to 0
The special case of characteristic curve equation.
Experiment and practice have shown that, when some situations of water pump system change, formula (4) proportionality law
It can vary widely.For many years, the change that lot of documents comparative example law both domestic and external is related to is carried out
Experiment and analysis, have accumulated many beneficial technical data, are especially that of obtaining the understanding of generality,
I.e. due to the presence of water pump system net lift, water pump consumption power is with water pump operation rotating speed neither formula (6)
Cubic relationship, nor first power relation, but a kind of non-linear relation, regrettably arrive and be at present
Only also it is stated without the effective theoretical formula of appearance or mathematical modeling, current analysis method base
It is offline graphical method and the regression equation calculation method based on statistics in sheet, in terms of practical standpoint,
There is presently no the computational methods of online use value.
The present invention starts with from water pump system actual operating mode, and labor formula (4) proportionality law occurs
The reason for change, and water pump operation operating mode change after the relation of flow and speed, construct and meet
Universal flow-speed mathematics modular form (1) during water pump variable-speed operation, so-called universal flow-speed mathematics
Model be meant that the mathematical modeling be not only suitable for proportionality law it is invalid when, the ratio of also being adapted for is determined
Restrain the occasion set up.
Universal flow-speed mathematics modular form (1) building process is as follows：
According to proportionality law formula (4), when water pump system has net lift HstWhen, the relation of flow and speed
It is changed into following formula：
Critical speed n in formulacSolved by formula (3) and formula (7) simultaneous.
In water pump variable-speed operation, critical speed ncOccur in flow Q1During equal to 0, this up-to-date style (9)
It is changed into：
C is the constant term in pump characteristic equation (2) in formula, equal to water pump system total head
Hm, by HmSubstitution formula (10), then critical speed ncFor formula (11).
Formula (8) is made up of two parts, and the curve of front portion is the situation of curve [1] in accompanying drawing 2, stream
Measure, i.e. net lift H directly proportional to speedst=0 curve, referred to as proportionality law curve；Latter part of song
Line is curve [3] in accompanying drawing 2, is one and originates in (0, nc), terminal is water pump system rated operation point (Qe, 0)
Curve, its physical significance is, when system has net lift HstWhen, with flow Q change to from 0 it is specified
Flow Qe, the influence of net lift is maximum in flow Q=0, reduces with the increase of flow, works as flow
Reach metered flow QeWhen, it influences to be 0, referred to as net lift influence curve.It is bent in accompanying drawing 2
Line [1] and curve [3] superposition just obtain curve [2], i.e. curve expressed by formula (8), the curve explanation
Net lift HstIn the presence of influence to flow and length velocity relation, curve now is by proportionality law curve
It is formed by stacking with net lift influence curve, these curves help intuitively to understand its physical significance,
Help to seek the method for correcting these curves, be closer to actual operation curve.
Curve [2] is not also flow and tensionvelocity curve truly, and typical flow closes with speed
System is as the curve expressed by curve [4] in accompanying drawing 2.Up to the present the lot of experimental data table delivered
Bright, flow and tensionvelocity curve are nonlinear curves, rather than straight line, the flow and speed of actual motion
The position that degree point is necessarily located on curve [4] or closed on positioned at the curve both sides, all flows and speed point must
So it is located at by coordinate (0,0), (0, nc) and (Qe, ne) in area defined.Qualitative point in theory
Analysis as a result, formula (8) be do not consider net lift to pump characteristics parametric variations, do not consider to manage
The situation when change of net characterisitic parameter influences, then consider that flow-speed mathematical modeling after these influences should
Which type of this isHere Model fitting coefficient k is introduced, using a factor containing coefficient k
(1-kQ1/Qe) be modified come the mathematical modeling of the latter half to formula (8), construct universal flow-
Speed mathematics modular form (1), for running any water pump in certain circumstances, factor (1-kQ1/Qe)
Considered the net lift in the range of full flow to pump characteristics Parameters variation, to system-head curve parameter
Factor when change influences, the general flow of used water pump is fitted by changing the coefficient k in the factor
Amount-speed mathematical modeling.
Work as k=0.71, ncWhen=600, curve [4] is referred to as existing and raised only in the accompanying drawing 2 drawn according to formula (1)
Journey HstWhen typical pump capacity and tensionvelocity curve, so-called typical case is, although the type of water pump,
The difference of specification can have the difference of some parameters, although outside network characteristic can have some differences,
The flow of pump and the excursion of speed characteristic curve and section must be located at curve [1] and curve in accompanying drawing 2
[2] enclose in fixed scope and section, different is only curve shape and its representative of different water pumps
Value can somewhat different change.
Curve [4] in 2 with reference to the accompanying drawings, the system of net lift be present, as long as flow reduces from metered flow,
The relation of flow and speed begin to deviate proportionality law, only the starting stage deviate it is smaller,
Then as the reduction of flow, the distance of curve [4] and curve [1] is gradually increased.Curvilinear motion explanation,
The flow that the size of net lift is directly affected in the range of full flow deviates the journey of proportionality law with length velocity relation
Degree.
The validity and practicality of universal flow-speed mathematics modular form (1) are further illustrated, according to preceding
The analysis in face, when net lift H being presentstWhen, the excursion of water pump speed change and section must be located at accompanying drawing 2
Middle curve [1] and curve [2] are enclosed in fixed scope and section, i.e., positioned at coordinate (0,0), (0, nc) and
(Qe, ne) in area defined, and the speed point of water pump speed change must be located at from coordinate (0, nc) extremely
Coordinate (Qe, ne) nonlinear curve certain point on or neighbouring point on.For specific water pump and its
Running environment, it can pass through under a certain net lift with a series of actual speed operating points of changes in flow rate
Change k values to be fitted, the precision of fitting press Engineering Control it needs to be determined that.Because formula (1) represents seat
Mark (0,0), (0, nc) and (Qe, ne) in area defined from coordinate (0, nc) to coordinate (Qe,
ne) nonlinear curve total data set, so k values can be chosen by fitting precision needs.For example,
As k=0, velocity amplitude is located at coordinate (0, nc) to coordinate (Qe, ne) oblique line certain point on；When
During k=1, velocity amplitude is located at coordinate (0, nc) to coordinate (Qe, ne) oblique line lower section close in accompanying drawing 2
On the certain point of the curve of curve [1]；When k is to be less than 1 more than 0, velocity amplitude is located at above-mentioned two song
On the certain point of some curve between line.By the value to k, with universal flow-speed mathematical modeling
The velocity amplitude that formula (1) calculates can very approach the corresponding velocity amplitude of actual motion.
As the approximating method of pump characteristic equation (2), water pump universal flow-number of speed
Learn modular form (1) and obtained after being fitted by experiment parameter, this is the complexity spy of pump equipment and its system
What point determined, because the flow of any water pump can not possibly accurately be expressed with the parameter k of a determination
With length velocity relation, it is necessary to obtained by the one-to-one experiment parameter of specific water pump after fitting.
The method for obtaining k values is the system using accompanying drawing 1, real by obtaining when carrying out field adjustable
The specific water pump operation correlative flow-speed data surveyed is fitted k values.
It is noted that in engineer applied, there are two kinds of processing methods to k values, a kind of method is by k values
As constant processing, i.e. k in formula (1) be 0~1 in some fixed constant, from coordinate (0,
nc) to (Qe, ne) whole rate curve in the range of correspond to some flow Q and can obtain corresponding speed
n；Another method is handled k values as an array, is intended in universal flow-speed mathematical modeling
During conjunction, to from coordinate (0, nc) to (Qe, ne) whole rate curve in the range of use one group of number
Value；For modern control technology, the processing for array is not so difficult, can be each by what is obtained after fitting
Individual k values are respectively stored in the database of control device, are then called in speed dynamic control；k
Value is particularly suited for use in pump characteristics parameter as the advantages of array manipulation has a case that discreteness, i.e., certain
The characterisitic parameter of individual water pump is not the occasion that regular variation characteristic is presented.
Water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling is to be by accompanying drawing 1
What system was realized, [1] is water pump variable rate data information processing and controlling device in accompanying drawing 1, is to be based on general flow
The core of the water pump variable speed energy conservation control of amount-speed mathematical modeling, is formed based on computer workstation
Digital device, itself have and pump characteristic equation (2), pipe system performance curve equation
(3), universal flow-relevant mathematical modeling of speed mathematics modular form (1), and in real time from production work
Skill master control system [2] obtains production run lock file, status information of equipment and relevant systematic parameter, real
When from water pump speed change system dynamic controller [3] obtain the letters such as the flow of each water pump system, pressure, speed
Breath, the control of each water pump is determined according to these information, about systematic parameter and mathematical modeling related data
Parameter simultaneously exports feed-water pump speed change dynamic controller [3]；Especially by universal flow-speed mathematics
Model can easily and accurately calculate the velocity amplitude that known mass flow is corresponded in the presence of net lift, then defeated
Go out feed-water pump speed change dynamic controller [3], speed change dynamic control is carried out to water pump；Water pump system speed change
Dynamic controller [3] is made up of PLC (programmable controller) or other digital controllers, according to [1]
Control parameter to 1#~n# pump speed controls device [11]~[n1] output speed setting value, collection in real time in addition
The pressure and flow information of 1#~n# water pump systems, and send [1] water pump variable rate data information processing and control to
Device processed；1#~n# pump speed controls device [11]~[n1] is according to the speed setting value of [3] to 1#~n# water pumps electricity
Motivation [12]~[n2] carries out speed regulation, and dynamic control is carried out to 1#~n# pump capacities；[13]~[n3]
It is 1#~n# water pump system pressure detectors, pressure value delivers to water pump system speed change dynamic controller [3]；
[14]~[n4] is 1#~n# water pump system flow detectors, and flow value delivers to water pump system speed change dynamic control
Device [3]；The closed-loop dynamic continuous control of water pump system is realized in this way.
On the boundary condition of water pump speed Control, the velocity interval of gearshift adjustment is by water pump system net lift
HstLimitation, net lift HstWith total head HmThe ratio between it is bigger, then the slewing range allowed is smaller.
According to table 1, as net lift HstFor total head Hm50% when, speed change critical speed is 35.36Hz,
The maximum magnitude that permission system carries out speed governing is 29.28%；As net lift HstFor total head Hm80% when,
Speed change critical speed is 44.72Hz, it is allowed to which maximum speed adjustable range is 10.56%.This of water pump system is special
Point limits speed adjustable range, amount of energy saving is received serious restriction, attention is should give in engineer applied, first
This data should be first checked, additionally needs to consider the influence for avoiding the other factorses such as cavitation, surge, and stay
There is certain safe clearance, suitable minimum speed change point is set for governing system, calculates estimated energy-conservation accordingly
Economic benefit.
In practical engineering application, the water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling
It is also applied for changing into water, water outlet pond liquid level and is to what closed vessel feedwater etc. was related to net lift change
System.The net lift of this kind of system is frequently not fixed constant, and pond liquid level change, net lift is to change；
Pressure in closed vessel is also a part for net lift, and the pressure in closed vessel is often in certain model
Enclose interior fluctuation.Application scenario in net lift with working conditions change, net lift must be held in system operation
Situation of change, so that water pump operates in the velocity interval of permission all the time.
It should be noted that for water pump system, optimal universal flow-speed mathematical modeling is obtained almost
It is impossible, and unpractical.Such as pump characteristic equation (2) is also only according to one group
A range of so-called high efficient district fitting experimental data into curvilinear equation, the characteristics of this is water pump and
What complexity was determined.So for water pump speed change universal flow-speed mathematics modular form (1), no matter
All there is special meaning in theory or on actual engineer applied.First, the mathematical modeling solves
During current water pump gearshift applications the problem of basic theory vacancy.Second, using the mathematical modeling be it is simple,
Easy, effective water pump speed change dynamic control method.3rd, by the use of such mathematical modeling as control according to
According to, profound level, fine closed-loop dynamic Energy Saving Control can be obtained, it is more more preferable than prior art acquisition
Energy-saving effect.Particularly universal flow-speed mathematical modeling can be provided for the water pump speed Control in modern times and cut
Real feasible theoretical foundation, overcome blindness existing for prior art, incomprehensiveness and probabilistic
The defects of being theoretically unsound, theoretical and application basis is established for the speed Control of water pump.
Due to universal flow-speed mathematics model solution determined water pump speed Control be theoretically unsound the problem of,
Water pump speed change dynamic control is carried out, the optimal control for energy saving of water pump can be achieved, by for the change of water pump
Fast energy-saving application starts brand-new, the extensive visual field and space, it is contemplated that energy-saving index is by prior art
On the basis of improve 15%~40%.
Water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling can be widely applied to newly-built
Or all kinds of water pump speed change water systems of transformation.
Claims (6)
1. the water pump variable speed energy conservation control method based on universal flow-speed mathematical modeling, it is characterized in that universal flow-speed mathematical modeling is formula (1)：
In formula：
n1：Water pump speed desired value, rpm or Hz
Q1：Water pump present flow rate, m3/s
Qe：Water pump metered flow, m3/s
ne：Water pump rated speed, rpm or Hz
nc：Water pump speed change critical speed, rpm or Hz
Hst：Water pump system net lift, m
Hm：Water pump system total head (lift of the pump characteristic equation when flow is 0), m
k：Model fitting coefficient, 0~1.
2. universal flow according to claim 1-speed mathematical modeling, it is characterized in that water pump speed change critical speed ncWith net lift Hst, total head HmAnd rated speed neRelevant, when rated speed is 50Hz, net lift is listed in table 1 to the influence result of calculation of water pump speed change critical speed.
Influence of the net lift of table 1. to water pump speed change critical speed
3. the water pump variable speed energy conservation control method according to claim 1 based on universal flow-speed mathematical modeling,It is characterized in that [1] is water pump variable rate data information processing and controlling device,It is the core of the water pump variable speed energy conservation control based on universal flow-speed mathematical modeling,It is the digital device formed based on computer workstation,Itself have and pump characteristic equation (2),Pipe system performance curve equation (3),Universal flow-relevant the mathematical modeling of speed mathematics modular form (1),And obtain production run lock file from production technology master control system [2] in real time,Status information of equipment and relevant systematic parameter,The flow of each water pump system is obtained from water pump system speed change dynamic controller [3] in real time,Pressure,The information such as speed,According to these information,The control parameter of each water pump is determined about systematic parameter and mathematical modeling related data and exports feed-water pump speed change dynamic controller [3]；The velocity amplitude that known mass flow is corresponded in the presence of net lift can be easily and accurately calculated especially by universal flow-speed mathematical modeling, is then output to water pump system speed change dynamic controller [3], speed change dynamic control is carried out to water pump；Water pump system speed change dynamic controller [3] is made up of PLC (programmable controller) or other digital controllers, according to the control parameter of [1] to 1#~n# pump speed controls device [11]~[n1] output speed setting value, in addition the pressure and flow information of collection 1#~n# water pump systems, and send [1] water pump variable rate data information processing and controlling device in real time；1#~n# pump speed controls device [11]~[n1] carries out speed regulation according to the speed setting value of [3] to 1#~n# pump motors [12]~[n2], and dynamic control is carried out to 1#~n# pump capacities；[13]~[n3] is 1#~n# water pump system pressure detectors, and pressure value delivers to water pump system speed change dynamic controller [3]；[14]~[n4] is 1#~n# water pump system flow detectors, and flow value delivers to water pump system speed change dynamic controller [3].
4. universal flow according to claim 1-speed mathematical modeling, it is characterized in that the method for obtaining k values is the system using accompanying drawing 1, when carrying out field adjustable, k values are fitted by obtaining specific water pump operation correlative flow-speed data of actual measurement.
5. universal flow according to claim 1-speed mathematical modeling, it is characterized in that there is two kinds of processing methods to k values, a kind of method is using k values as constant processing, i.e. k in formula (1) is some fixed constant in 0~1, from coordinate (0, nc) to (Qe, ne) whole rate curve in the range of correspond to some flow Q and can obtain corresponding speed n；Another method is handled k values as an array, in universal flow-speed mathematics model fitting process, to from coordinate (0, nc) to (Qe, ne) whole rate curve in the range of use one group of numerical value；For modern control technology, the processing for array is not so difficult, each k values obtained after fitting can be respectively stored in the database of control device, is then called in speed dynamic control；K values are particularly suited for use in pump characteristics parameter as the advantages of array manipulation has the object of discreteness, i.e. the characterisitic parameter of some water pump is not the occasion that regular variation characteristic is presented.
6. the water pump variable speed energy conservation control method according to claim 1 based on universal flow-speed mathematical modeling, it is characterized in that the system that this method is also applied for into water, water outlet pond liquid level changing and to closed vessel feedwater etc. being related to net lift change.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114251852A (en) * | 2021-08-24 | 2022-03-29 | 佛山市顺德区美的饮水机制造有限公司 | Instantaneous heating device, control method and control device thereof, water treatment device and medium |
| TWI833402B (en) * | 2022-10-25 | 2024-02-21 | 中國鋼鐵股份有限公司 | Method for detecting efficiency of individual pump in parallel centrifugal pump station |
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| CN205677813U (en) * | 2016-03-30 | 2016-11-09 | 北京凯德中天科技发展有限公司 | Water pump variable speed energy conservation kinetic-control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114251852A (en) * | 2021-08-24 | 2022-03-29 | 佛山市顺德区美的饮水机制造有限公司 | Instantaneous heating device, control method and control device thereof, water treatment device and medium |
| TWI833402B (en) * | 2022-10-25 | 2024-02-21 | 中國鋼鐵股份有限公司 | Method for detecting efficiency of individual pump in parallel centrifugal pump station |
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