CN104563217A - Constant-pressure water supply controlling method without pressure sensor - Google Patents
Constant-pressure water supply controlling method without pressure sensor Download PDFInfo
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- CN104563217A CN104563217A CN201410815493.4A CN201410815493A CN104563217A CN 104563217 A CN104563217 A CN 104563217A CN 201410815493 A CN201410815493 A CN 201410815493A CN 104563217 A CN104563217 A CN 104563217A
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- power
- pressure
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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
The invention discloses a constant-pressure water supply controlling method without a pressure sensor. In the traditional constant-pressure water supply controlling scheme, the purchasing cost of a pressure sensor takes up to 20%-50% of a whole constant-pressure water supply controlling system, so the cost is high, and the sensor is easily interfered during working process. The controlling method comprises two steps of calibrating the constant-pressure data of a water pump, and controlling the constant-pressure water supply of the water pump. In the technical scheme, based on the centrifugal water pump model, data of pressure, flow, rotating rate and power of the water pump are pre-calibrated on the water pump testing system and treated through a constant-pressure water supply algorithm without the pressure sensor, so that the function of maintaining the constant pressure of the outlet of the water pump is realized in a condition without the pressure sensor, problems caused by the usage of the pressure sensor are avoided, the purchasing cast and the maintenance cost of the system are reduced, and the reliability of the system is improved.
Description
Technical field
The present invention relates to water-supply control, especially without pressure sensor constant pressure water supply control method.
Background technology
In constant pressure water supply controls, pressure sensor, frequency converter is usually adopted to carry out Stress control.Pressure sensor identifies the change of water pump discharge pressure automatically, and send this signal to frequency converter, after frequency converter receives pressure signal, via inner PID adjuster, pressure is controlled, then the rotating speed of pump is regulated, realize the control objectives that water pump discharge pressure is constant.
In traditional constant pressure water supply control program, the purchase cost of pressure sensor accounts for 20% ~ 50% of whole constant pressure water supply control system.In routine use process, improper being all easy to of deposition accumulated slag, environment temperature and humidity in pipeline causes working sensor abnormal, cable need be passed water joint and tighten sealing nut when wiring, Long-Time Service can regular appearance sealing loosen, the phenomenon such as to leak, need periodicmaintenance, the reliability of conventional constant voltage water management system is reduced greatly, makes later maintenance cost significantly increase simultaneously.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition carries out improving to prior art and improves, provides without pressure sensor constant pressure water supply control method, while reaching and reducing costs, and the object of raising system reliability.For this reason, the present invention takes following technical scheme.
Without pressure sensor constant pressure water supply control method, it is characterized in that comprising the following steps:
A. water pump constant voltage data scaling step;
A1) choose one grade of pressure to demarcate water pump, valve is closed completely, regulates pump rotary speed to equal nominal pressure to the outlet pressure of water pump;
A2) improve valve opening, wait for water pump discharge pressure stable reading, regulate pump rotary speed to equal nominal pressure to current pressure reading;
A3) obtain power of motor, power of motor is obtained by frequency converter, and frequency converter obtains power of motor following two kinds of modes: one is sampled to busbar voltage, bus current, and power of motor equals the product of busbar voltage and bus current; Another kind is sampled to torque current, and power of motor equals the product of torque current, torque constant and rotating speed;
A4) current power, rotating speed, pressure and flow is recorded as one group of nominal data;
A5) repeat steps A 2), A3), A4), complete 20 ~ 30 groups of nominal datas;
A6) above all nominal datas are organized into nominal data table, as the foundation of constant-pressure operation method;
B. water pump constant pressure water supply rate-determining steps;
B1) starter motor, makes motor run to initial speed n;
B2) search the power-rotation speed relation table in nominal data table according to current rotating speed, obtain the theoretical power (horse-power) that current rotating speed is corresponding, between adjacent two nominal data points, calculate theory of correspondences power by linear interpolation; Or go out linear equation according to the power in nominal data table-rotation speed relation table linear fit in advance, and according to linear equation and the current rotating speed calculating theoretical power (horse-power) of matching, 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 frequency converter
inst;
B4) theoretical power (horse-power) P is compared
theorywith current motor power P
instsize, if current motor power is greater than theoretical power (horse-power), improve rotating speed be 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 is repeated, until actual pressure reaches in goal pressure error range.Actual pressure and goal pressure are the estimate of tabling look-up and obtaining.
Beneficial effect: the present invention is based on centrifugal water pump model, water pump testing system carries out data scaling to the pressure of water pump, flow, rotating speed and power in advance, pass through without pressure sensor constant pressure water supply algorithm process, realize without maintaining the constant function of water pump discharge pressure under pressure sensor condition, avoid pressure sensor and use the problems caused, reduce buying and the maintenance cost of system, improve the reliability of system.
Accompanying drawing explanation
Fig. 1 is rotating speed of the present invention-power relation figure.
Fig. 2 is flow chart of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme of the present invention 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 larger, and pressure (lift) is less, and power is also larger, and vice versa;
2., under uniform pressure (lift), flow is larger, and rotating speed is higher, and vice versa;
3. under same traffic, rotating speed is higher, and pressure (lift) is larger, and power is also larger, and vice versa;
4. under equal-wattage, rotating speed is higher, and flow is less, and vice versa.
As shown in Figure 2, the present invention comprises two parts: Part I is the scaling method of water pump constant voltage data, and Part II is water pump constant-pressure operation method.
The demarcation of water pump constant voltage data is based on water pump testing system, and this system is made up of tested pump, valve, pipeline, water pump discharge pressure sensor, pump capacity sensor, and the rotating speed regulating water pump is responsible for by frequency converter.Concrete grammar and the step of the demarcation of water pump constant voltage data are:
1. choose one grade of pressure to demarcate, valve is closed completely, regulates pump rotary speed to equal nominal pressure to the outlet pressure of water pump;
2. improve valve opening gradually, wait for water pump discharge pressure stable reading, regulate pump rotary speed to equal nominal pressure to current pressure reading;
3. obtain power of motor, power of motor is obtained by frequency converter, and frequency converter obtains power of motor following two kinds of modes: one is sampled to busbar voltage, bus current, and power of motor equals the product of busbar voltage and bus current; Another kind is sampled to torque current, and power of motor equals the product of torque current, torque constant and rotating speed;
4. record current power, rotating speed, pressure and flow as one group of nominal data;
5. repeat step 2,3,4, repeatedly demarcate 20 ~ 30 groups of data;
6. more than all data preparations 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. starter motor, makes motor run to initial speed n;
2. search the power-rotation speed relation table in nominal data table according to current rotating speed, obtain the theoretical power (horse-power) that current rotating speed is corresponding, between adjacent two nominal data points, calculate theory of correspondences power by linear interpolation;
3. obtain current power of motor P by frequency converter
inst;
4. compare theoretical power (horse-power) P
theorywith current motor power P
instsize.If current motor power is greater than theoretical power (horse-power), 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 linear equation according to the power in nominal data table-rotation speed relation table linear fit in advance;
2. starter motor, makes motor run to initial speed n;
3. calculate theoretical power (horse-power) according to fit equation and current rotating speed, its computational methods are: theoretical power (horse-power)=current rotating speed × fitting a straight line slope+fitting a straight line intercept;
4. obtain current power of motor P by frequency converter
inst;
5. compare theoretical power (horse-power) P
theorywith current motor power P
instsize;
. if current motor power is greater 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;
6. repeat step 2,3,4,5, until actual pressure reaches in goal pressure error range.
Claims (1)
1., without pressure sensor constant pressure water supply control method, it is characterized in that comprising the following steps:
A. water pump constant voltage data scaling step;
A1) choose one grade of pressure to demarcate water pump, valve is closed completely, regulates pump rotary speed to equal nominal pressure to the outlet pressure of water pump;
A2) improve valve opening, wait for water pump discharge pressure stable reading, regulate pump rotary speed to equal nominal pressure to current pressure reading;
A3) obtain power of motor, power of motor is obtained by frequency converter, and frequency converter obtains power of motor following two kinds of modes: one is sampled to busbar voltage, bus current, and power of motor equals the product of busbar voltage and bus current; Another kind is sampled to torque current, and power of motor equals the product of torque current, torque constant and rotating speed;
A4) current power, rotating speed, pressure and flow is recorded as one group of nominal data;
A5) repeat steps A 2), A3), A4), complete 20 ~ 30 groups of nominal datas;
A6) above all nominal datas are organized into nominal data table, as the foundation of constant-pressure operation method;
B. water pump constant pressure water supply rate-determining steps;
B1) starter motor, makes motor run to initial speed n;
B2) search the power-rotation speed relation table in nominal data table according to current rotating speed, obtain the theoretical power (horse-power) that current rotating speed is corresponding, between adjacent two nominal data points, calculate theory of correspondences power by linear interpolation; Or go out linear equation according to the power in nominal data table-rotation speed relation table linear fit in advance, and according to linear equation and the current rotating speed calculating theoretical power (horse-power) of matching, 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 frequency converter
inst;
B4) theoretical power (horse-power) P is compared
theorywith current motor power P
instsize, if current motor power is greater than theoretical power (horse-power), improve rotating speed be 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 is repeated, until actual pressure reaches in goal pressure error range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410815493.4A CN104563217B (en) | 2014-12-24 | 2014-12-24 | No pressure sensor constant pressure water supply control method |
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| CN201410815493.4A CN104563217B (en) | 2014-12-24 | 2014-12-24 | No pressure sensor constant pressure water supply control method |
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| CN104563217B CN104563217B (en) | 2016-09-28 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386487A (en) * | 2015-12-08 | 2016-03-09 | 卧龙电气集团股份有限公司 | Automatic calibration system for sensor-less constant-pressure water supply and working method of automatic calibration system |
| CN105490462A (en) * | 2015-12-23 | 2016-04-13 | 卧龙电气集团股份有限公司 | Intelligently controlled integrated variable frequency motor system |
| 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 |
| CN106301132A (en) * | 2016-10-24 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Permagnetic synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator |
| CN106837767A (en) * | 2017-04-01 | 2017-06-13 | 北京慧鎏科技有限公司 | The control method of pump, control device and system |
| 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 |
| CN111828299A (en) * | 2020-07-16 | 2020-10-27 | 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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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386487A (en) * | 2015-12-08 | 2016-03-09 | 卧龙电气集团股份有限公司 | Automatic calibration system for sensor-less constant-pressure water supply and working method of automatic calibration system |
| 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 |
| CN105490462A (en) * | 2015-12-23 | 2016-04-13 | 卧龙电气集团股份有限公司 | Intelligently controlled integrated variable frequency motor system |
| 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 |
| CN106301132A (en) * | 2016-10-24 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Permagnetic synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator |
| 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 |
| CN106837767A (en) * | 2017-04-01 | 2017-06-13 | 北京慧鎏科技有限公司 | The control method of pump, control device and system |
| 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 |
| CN111828299A (en) * | 2020-07-16 | 2020-10-27 | 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 |
| CN114046259B (en) * | 2021-11-12 | 2024-05-28 | 利欧集团浙江泵业有限公司 | Centrifugal pump variable frequency control method based on double neural network model |
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| CN104563217B (en) | 2016-09-28 |
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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. |