CN104563217B - No pressure sensor constant pressure water supply control method - Google Patents
No pressure sensor constant pressure water supply control method Download PDFInfo
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- CN104563217B CN104563217B CN201410815493.4A CN201410815493A CN104563217B CN 104563217 B CN104563217 B CN 104563217B CN 201410815493 A CN201410815493 A CN 201410815493A CN 104563217 B CN104563217 B CN 104563217B
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- power
- pressure
- water pump
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- motor
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Classifications
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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
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
No pressure sensor constant pressure water supply control method, in traditional constant pressure water supply control program, the purchase cost of pressure transducer accounts for the 20% ~ 50% of whole constant pressure water supply control system.Cost is high, and working sensor is easily disturbed.The present invention includes water pump constant voltage data scaling step and water pump constant pressure water supply rate-determining steps.The technical program is based on centrifugal water pump model, water pump testing system carries out data scaling to pressure, flow, rotating speed and the power of water pump in advance, through no pressure sensor constant pressure water supply algorithm process, realize the function maintaining water pump discharge pressure constant under no pressure sensor condition, avoid pressure transducer and use the problems caused, reduce buying and the maintenance cost of system, improve the reliability of system.
Description
Technical field
The present invention relates to water-supply control, especially no pressure sensor constant pressure water supply controlling party
Method.
Background technology
In constant pressure water supply control, pressure transducer, converter is generally used to carry out Stress control.
Pressure transducer identifies the change of water pump discharge pressure automatically, and delivers it to converter,
After converter receives pressure signal, pressure is controlled, then via internal PID regulator
The rotating speed of pump is adjusted, it is achieved the control target that water pump discharge pressure is constant.
In traditional constant pressure water supply control program, the purchase cost of pressure transducer accounts for whole constant voltage
The 20%～50% of water management system.During routine use, the deposition accumulated slag in pipeline, ring
Border temperature and humidity is improper all easily causes working sensor extremely, need to be by cable when wiring
Through water joint and tighten sealing nut, life-time service regular appearance sealing can loosen, leak
Etc. phenomenon, need periodicmaintenance, make the reliability of conventional constant voltage water management system be substantially reduced,
Make later maintenance cost dramatically increase simultaneously.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to enter prior art
Row improves and improves, it is provided that no pressure sensor constant pressure water supply control method, to reduce cost
While, improve the purpose of system reliability.To this end, the present invention takes techniques below scheme.
No pressure sensor constant pressure water supply control method, it is characterised in that comprise the following steps:
A. water pump constant voltage data scaling step；
A1) choosing one grade of pressure to demarcate water pump, valve completely closes, and regulates pump rotary speed
Outlet pressure to water pump is equal to nominal pressure；
A2) improving valve opening, wait water pump discharge pressure stable reading, regulation pump rotary speed is extremely
Current pressure reading is equal to nominal pressure；
A3) obtaining power of motor, power of motor is obtained by converter, and converter obtains motor merit
Rate has following two mode: busbar voltage, bus current are sampled by one, power of motor etc.
Product in busbar voltage Yu bus current；Torque current is sampled by another kind, power of motor
Product equal to torque current, torque constant and rotating speed；
A4) record current power, rotating speed, pressure and flow are as one group of nominal data；
A5) repeat step A2), A3), A4), complete 20～30 groups of nominal datas；
A6) all above nominal data is organized into nominal data table, as constant-pressure operation method
Foundation；
B. water pump constant pressure water supply rate-determining steps；
B1) start motor, make motor run to initial speed n；
B2) power-rotation speed relation table in nominal data table is searched according to current rotating speed, it is thus achieved that when
The theoretical power (horse-power) that front rotating speed is corresponding, is calculated by linear interpolation between adjacent two nominal data points
Theory of correspondences power；Or in advance according to the power in nominal data table-rotation speed relation table linear fit
Going out linear equation, linear equation and current rotating speed according to matching calculate theoretical power (horse-power), theoretical power (horse-power)
=current rotating speed × fitting a straight line slope+fitting a straight line intercept；
B3) current power of motor P is obtained by converterinst；
B4) theoretical power (horse-power) P is comparedtheoryWith current motor power PinstSize, if current motor
Power is more than theoretical power (horse-power), and improving rotating speed is n+ Δ n；If current motor power is less than theoretical power (horse-power),
Reducing rotating speed is n-Δ n, wherein Δ n ＞ 0；
B5) step B2, B3, B4, B5 are repeated, until actual pressure reaches goal pressure error
In the range of.Actual pressure and goal pressure are the estimated value obtained of tabling look-up.
Beneficial effect: the present invention is based on centrifugal water pump model, the most right on water pump testing system
The pressure of water pump, flow, rotating speed and power carry out data scaling, through no pressure sensor constant voltage
Water supply algorithm process, it is achieved maintain the merit that water pump discharge pressure is constant under no pressure sensor condition
Can, it is to avoid pressure transducer uses the problems caused, and reduces buying and the maintenance of system
Cost, improves the reliability of system.
Accompanying drawing explanation
Fig. 1 is the rotating speed-power relation figure of the present invention.
Fig. 2 is flow chart of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme is described in further detail.
The basic law of centrifugal water pump model may be summarized to be:
1. under same rotational speed, flow is the biggest, and pressure (lift) is the least, and power is the biggest, instead
As the same；
2., under uniform pressure (lift), flow is the biggest, and rotating speed is the highest, and vice versa；
3. under same traffic, rotating speed is the highest, and pressure (lift) is the biggest, and power is the biggest, instead
As the same；
4. under equal-wattage, rotating speed is the highest, and flow is the least, and vice versa.
As in figure 2 it is shown, the present invention comprises two parts: Part I is the demarcation of water pump constant voltage data
Method, Part II is water pump constant-pressure operation method.
The demarcation of water pump constant voltage data based on water pump testing system, this system by tested pump, valve,
Pipeline, water pump discharge pressure sensor, pump capacity sensor etc. form, and regulation is responsible for by converter
The rotating speed of water pump.Concrete grammar and the step of the demarcation of water pump constant voltage data be:
1. choosing one grade of pressure to demarcate, valve completely closes, and regulation pump rotary speed is to water pump
Outlet pressure is equal to nominal pressure；
2. gradually step up valve opening, wait that water pump discharge pressure stable reading, regulation water pump turn
Speed is equal to nominal pressure to current pressure reading；
3. obtaining power of motor, power of motor is obtained by converter, and converter obtains motor merit
Rate has following two mode: busbar voltage, bus current are sampled by one, power of motor etc.
Product in busbar voltage Yu bus current；Torque current is sampled by another kind, power of motor
Product equal to torque current, torque constant and rotating speed；
4. record current power, rotating speed, pressure and flow are as one group of nominal data；
5. repeat step 2,3,4, repeatedly demarcated 20～30 groups of data；
6. all above data compilation is become nominal data table, as the foundation of constant-pressure operation method.
Rotating speed-power relation figure, as shown in Figure 1:
Based on above-mentioned nominal data table, water pump constant-pressure operation method is divided into two kinds:
The step of the first constant-pressure operation method is:
1. start motor, make motor run to initial speed n；
2. search the power-rotation speed relation table in nominal data table according to current rotating speed, it is thus achieved that current
The theoretical power (horse-power) that rotating speed is corresponding, it is right to be calculated by linear interpolation between adjacent two nominal data points
Answer theoretical power (horse-power)；
3. obtain current power of motor P by converterinst；
4. compare theoretical power (horse-power) PtheoryWith current motor power PinstSize.If current motor merit
Rate is more than theoretical power (horse-power), and improving rotating speed is n+ Δ n；If current motor power is less than theoretical power (horse-power),
Reducing rotating speed is n-Δ n, wherein Δ n ＞ 0；
5. repeat step 2,3,4,5, until actual pressure is close to goal pressure.
The step of the second constant-pressure operation method is:
1. go out straight line side according to the power in nominal data table-rotation speed relation table linear fit in advance
Journey；
2. start motor, make motor run to initial speed n；
3. calculating theoretical power (horse-power) according to fit equation and current rotating speed, its computational methods are: theoretical
Power=current rotating speed × fitting a straight line slope+fitting a straight line intercept；
4. obtain current power of motor P by converterinst；
5. compare theoretical power (horse-power) PtheoryWith current motor power PinstSize；
. if current motor power is more than theoretical power (horse-power), and improving rotating speed is n+ Δ n；If current motor
Power is less than theoretical power (horse-power), and reducing rotating speed is n-Δ n, wherein Δ n ＞ 0；
6. repeat step 2,3,4,5, until actual pressure reaches in goal pressure range of error.
Claims (1)
1. no pressure sensor constant pressure water supply control method, it is characterised in that comprise the following steps:
A. water pump constant voltage data scaling step；
The demarcation of water pump constant voltage data includes tested based on water pump testing system, water pump testing system
Pump, valve, pipeline, water pump discharge pressure sensor, pump capacity sensor；
A1) choosing one grade of pressure to demarcate water pump, valve completely closes, and regulates pump rotary speed
Outlet pressure to water pump is equal to nominal pressure；
A2) improving valve opening, wait water pump discharge pressure stable reading, regulation pump rotary speed is extremely
Current pressure reading is equal to nominal pressure；
A3) obtaining power of motor, power of motor is obtained by converter, and converter obtains motor merit
Rate has following two mode: busbar voltage, bus current are sampled by one, power of motor etc.
Product in busbar voltage Yu bus current；Torque current is sampled by another kind, power of motor
Product equal to torque current, torque constant and rotating speed；
A4) record current power, rotating speed, pressure and flow are as one group of nominal data；
A5) repeat step A2), A3), A4), complete 20～30 groups of nominal datas；
A6) all above nominal data is organized into nominal data table, as constant-pressure operation method
Foundation；
B. water pump constant pressure water supply rate-determining steps；
B1) start motor, make motor run to initial speed n；
B2) power-rotation speed relation table in nominal data table is searched according to current rotating speed, it is thus achieved that when
The theoretical power (horse-power) that front rotating speed is corresponding, is calculated by linear interpolation between adjacent two nominal data points
Theory of correspondences power；Or in advance according to the power in nominal data table-rotation speed relation table linear fit
Going out linear equation, linear equation and current rotating speed according to matching calculate theoretical power (horse-power), theoretical power (horse-power)
=current rotating speed × fitting a straight line slope+fitting a straight line intercept；
B3) current power of motor P is obtained by converterinst；
B4) theoretical power (horse-power) P is comparedtheoryWith current motor power PinstSize, if current motor
Power is more than theoretical power (horse-power), and improving rotating speed is n+ Δ n；If current motor power is less than theoretical power (horse-power),
Reducing rotating speed is n-Δ n, wherein Δ n ＞ 0；
B5) step B2, B3, B4, B5 are repeated, until actual pressure reaches goal pressure error
In the range of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815493.4A CN104563217B (en) | 2014-12-24 | 2014-12-24 | No pressure sensor constant pressure water supply control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815493.4A CN104563217B (en) | 2014-12-24 | 2014-12-24 | No pressure sensor constant pressure water supply control method |
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| CN104563217A CN104563217A (en) | 2015-04-29 |
| CN104563217B true CN104563217B (en) | 2016-09-28 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386487B (en) * | 2015-12-08 | 2017-10-17 | 卧龙电气集团股份有限公司 | One kind is without sensing constant pressure water supply automatic calibration system and its method of work |
| CN105490462B (en) * | 2015-12-23 | 2018-06-05 | 卧龙电气集团股份有限公司 | A kind of integral type variable-frequency motor system with intelligent control |
| CN105839711A (en) * | 2016-03-24 | 2016-08-10 | 嘉兴极致传动科技有限公司 | Sensor-less variable frequency constant-pressure water supply control method |
| CN106301132B (en) * | 2016-10-24 | 2018-12-21 | 珠海格力电器股份有限公司 | Permanent magnet synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator |
| CN106837767B (en) * | 2017-04-01 | 2018-04-06 | 北京慧鎏科技有限公司 | The control method and system of pump |
| CN110118170A (en) * | 2019-05-09 | 2019-08-13 | 常州市康迪克至精电机有限公司 | Using the water pump perseverance lift control method of direct current permanent magnet motor no pressure sensor |
| CN111350651A (en) * | 2020-03-12 | 2020-06-30 | 利欧集团浙江泵业有限公司 | Constant-pressure control method of intelligent variable-frequency water pump |
| CN111828299B (en) * | 2020-07-16 | 2022-05-27 | 上海熠动动力科技有限公司 | Constant-pressure water supply control method without pressure sensor |
| CN114046259A (en) * | 2021-11-12 | 2022-02-15 | 利欧集团浙江泵业有限公司 | Centrifugal pump frequency conversion control method based on double neural network model |
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| US20090107562A1 (en) * | 2007-10-29 | 2009-04-30 | Ruibo Wang | Pre-pressurized self-balanced negative-pressure-free water-supply apparatus |
| CN103556677B (en) * | 2013-09-10 | 2015-07-22 | 台州神能电器有限公司 | Control method of efficient variable-frequency constant-pressure water supply system |
| CN103485386B (en) * | 2013-09-10 | 2014-12-24 | 温州大学 | Variable frequency constant-pressure water supply system control method based on gray correlation method |
| CN103488082B (en) * | 2013-09-10 | 2015-12-09 | 温州大学 | A kind of high-efficiency frequency conversion constant pressure water supply system control method based on inverse estimation method |
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Address after: 312300 No. 1801 Renmin West Road, Shaoxing, Zhejiang, Shangyu Co-patentee after: WOLONG ELECTRICAL GROUP HANGZHOU RESEARCH INSTITUTE Co.,Ltd. Patentee after: WOLONG ELECTRIC GROUP Co.,Ltd. Address before: 312300 No. 1801 Renmin West Road, Shaoxing, Zhejiang, Shangyu Co-patentee before: WOLONG ELECTRICAL GROUP HANGZHOU RESEARCH INSTITUTE Co.,Ltd. Patentee before: WOLONG ELECTRIC GROUP Co.,Ltd. |
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Effective date of registration: 20191018 Address after: 312300 economic development zone, Shangyu District, Zhejiang, Shaoxing Co-patentee after: WOLONG ELECTRICAL GROUP HANGZHOU RESEARCH INSTITUTE Co.,Ltd. Patentee after: WOLONG ELECTRIC GROUP Co.,Ltd. Co-patentee after: Zhejiang Wolong Servo Technology Co.,Ltd. Address before: 312300 No. 1801 Renmin West Road, Shaoxing, Zhejiang, Shangyu Co-patentee before: WOLONG ELECTRICAL GROUP HANGZHOU RESEARCH INSTITUTE Co.,Ltd. Patentee before: WOLONG ELECTRIC GROUP Co.,Ltd. |
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Effective date of registration: 20200327 Address after: 312300 economic development zone, Shangyu District, Zhejiang, Shaoxing Co-patentee after: Zhejiang Wolong Servo Technology Co.,Ltd. Patentee after: WOLONG ELECTRIC GROUP Co.,Ltd. Address before: 312300 economic development zone, Shangyu District, Zhejiang, Shaoxing Co-patentee before: WOLONG ELECTRICAL GROUP HANGZHOU RESEARCH INSTITUTE Co.,Ltd. Patentee before: WOLONG ELECTRIC GROUP Co.,Ltd. Co-patentee before: Zhejiang Wolong Servo Technology Co.,Ltd. |
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