CN106499009B - A kind of intelligent water supply device and method - Google Patents
A kind of intelligent water supply device and method Download PDFInfo
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- CN106499009B CN106499009B CN201611073119.7A CN201611073119A CN106499009B CN 106499009 B CN106499009 B CN 106499009B CN 201611073119 A CN201611073119 A CN 201611073119A CN 106499009 B CN106499009 B CN 106499009B
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- hydraulic pressure
- frequency converter
- threshold value
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
Abstract
The invention discloses a kind of intelligent water supply devices.Intelligent water supply device of the present invention is specific as follows to the control method of starting, the stopping of frequency converter: when discharge side hydraulic pressure sampled value lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1, and a period of time T hereafter2Interior, the maximum value of discharge side hydraulic pressure sampled value is less than preset second starting hydraulic pressure threshold value, then controls frequency converter starting, otherwise, frequency converter does not start；In frequency converter operational process, such as there is discharge side hydraulic pressure sampled value and shut down hydraulic pressure threshold value higher than preset and continue for some time T3Or the running frequency of frequency converter lower than preset minimum running frequency and continues for some time T4, then frequency converter stopping is controlled；First starting hydraulic pressure threshold value < the second starting hydraulic pressure threshold value < shuts down hydraulic pressure threshold value.The invention also discloses a kind of intelligent water supply methods.The control mode that starts and stops of frequency converter is optimized in the present invention, can extend the normal service life of equipment to a certain extent.
Description
Technical field
The present invention relates to a kind of intelligent water supply device and methods.
Background technique
The master that pressurized water supply has become production, living water is carried out to backend user using the water pump of transducer drive
Mode is wanted, such way of supplying water generallys use the Frequency Converter Control strategy of constant pressure water supply, i.e., keeps permanent with water pump water outlet side hydraulic pressure
It is set to target and PI or PID control is carried out to frequency converter.For example, vapor and water are two essential in dyeing
Element.Enterprise is for energy conservation, the considerations of reducing cost, it will usually build a tank and be returned vapor after use
Receive utilize, the liquefied water recycled in tank at this time is that have certain temperature, in certain techniques, using these recycle water,
Not only water quality is good, and can reduce the heating energy consumption of water, and the expense of certain water is also to have saving, exists in economic benefit
Higher feasibility.The scheme generallyd use is to increase a booster water pump, after being pressurized to the water outlet of tank to the back-end
It supplies water, controls the output of booster water pump using frequency converter generally according to actual demand.Fig. 1 shows a kind of adoptable intelligence
Water system in figure, 1 is tank, 2 is water pipe, 3 is frequency converter, 4 is pressure-detecting device, 5 is booster water pump, 6 is water outlet
Mouth control valve, pi regulator built in frequency converter 3.4 real-time detection of pressure-detecting device water outlet side hydraulic pressure P is simultaneously transferred to PI adjusting
Device, as shown in Fig. 2, pi regulator will be discharged after side hydraulic pressure P is compared as value of feedback with preset command pressure value Pref
Corresponding frequency instruction f is exported to frequency converter 3, the revolving speed corresponding change of booster water pump 5, so that the hydraulic pressure for controlling water outlet side is kept
Constant or water flow is kept constant.
Currently, to be concentrated mainly on the running control target of frequency converter for the research of intelligent water supply method fast by researcher
Speed is accurately realized.Work study is less is started and stopped for frequency converter, the prior art is substantially the water for passing through setting
Pressure upper and lower limit starts and stops control realize frequency converter, when water outlet side water pressure monitoring value is lower than hydraulic pressure lower limit, then starts change
Frequency device, when water outlet side water pressure monitoring value be higher than the hydraulic pressure upper limit, then stop frequency converter.
Under actual use environment, above-mentioned frequency converter start and stop control mode tend to cause frequency converter,
The frequent starting of water pump is shut down, and the normal service life of equipment can be reduced.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of intelligent water supply device, needles
Start and stop control mode of the actual conditions to frequency converter is optimized, normally making for equipment can be extended to a certain extent
Use the service life.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of intelligent water supply device, comprising:
Pump, for being conveyed after being pressurized water；
Frequency converter, for driving the pump variable-speed operation；
Pressure sensor is sampled for the discharge side hydraulic pressure to the pump；
Control unit is specific to the control method of starting, the stopping of frequency converter for controlling the frequency converter
It is as follows:
When discharge side hydraulic pressure sampled value lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1, and hereafter
A period of time T2Interior, the maximum value of discharge side hydraulic pressure sampled value is less than preset second starting hydraulic pressure threshold value, then controls change
The starting of frequency device, otherwise, frequency converter does not start；
In frequency converter operational process, such as occur discharge side hydraulic pressure sampled value be higher than it is preset shut down hydraulic pressure threshold value and continue
A period of time T3Or the running frequency of frequency converter lower than preset minimum running frequency and continues for some time T4, then change is controlled
Frequency device stops；
First starting hydraulic pressure threshold value < the second starting hydraulic pressure threshold value < shuts down hydraulic pressure threshold value.
Preferably, in frequency converter operational process, control unit so that the discharge side hydraulic pressure of the pump keep constant it is pre-
If pressure is that target controls frequency converter.
Preferably, described control unit is PI or PID control unit.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of intelligent water supply method does variable-speed operation by transducer drive pump to convey after being pressurized water；The frequency conversion
The starting of device, method for controlling stopping are specific as follows:
When the discharge side hydraulic pressure sampled value of pump lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1, and
Hereafter a period of time T2Interior, the maximum value of discharge side hydraulic pressure sampled value is less than preset second starting hydraulic pressure threshold value, then controls
Frequency converter starting processed, otherwise, frequency converter does not start；
In frequency converter operational process, as the discharge side hydraulic pressure sampled value that occurs pumping be higher than it is preset shut down hydraulic pressure threshold value and
Continue for some time T3Or the running frequency of frequency converter lower than preset minimum running frequency and continues for some time T4, then control
Frequency converter processed stops；
First starting hydraulic pressure threshold value < the second starting hydraulic pressure threshold value < shuts down hydraulic pressure threshold value.
Preferably, in frequency converter operational process, so that the preset pressure that the discharge side hydraulic pressure of the pump is kept constant is
Target controls frequency converter.
Preferably, PI control or PID control are carried out to frequency converter.
Compared with prior art, the invention has the following advantages:
The present invention starts and stops control mode to pump variable frequency device in intelligent water supply device for practical service environment
It is optimized, the starting of unnecessary frequency converter, water pump can be effectively reduced, to extend the normal of equipment to a certain extent
Service life.
Detailed description of the invention
Fig. 1 be intelligent water supply system example, wherein 1 be tank, 2 be water pipe, 3 be frequency converter, 4 be pressure detecting fill
It sets, 5 be booster water pump, 6 be water outlet control valve；
Fig. 2 is pi regulator schematic illustration；
Fig. 3 is the situation of change that side hydraulic pressure is discharged close after being opened with the penstock short time again in the case where；
Fig. 4 is the situation of change that side hydraulic pressure is discharged in the case where opening just common water with penstock；
Fig. 5 is that frequency converter starts and stops control flow chart in intelligent water supply device of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
For the intelligent water supply device shown in Fig. 1, it is assumed that be that existing frequency converter starts controlling party automatically used by it
Pressure-detecting device 4 is sampled obtained discharge side hydraulic pressure sampled value P and preset starting hydraulic pressure threshold value by case, i.e. control unit
PminIt compares, once detect discharge side hydraulic pressure sampled value P lower than Pmin(or discharge side hydraulic pressure sampled value P is lower than PminShape
State reaches preset a period of time), then frequency converter starting is controlled, and then drive water pump starting operating.
But it is found through numerous studies, intelligent water supply device using the above scheme has a kind of phenomenon in actual use:
It is closed when user opens water outlet control valve, and rapidly, the water pump discharge side hydraulic pressure that pressure-detecting device is sampled is such as
Shown in Fig. 3；It can be seen from the figure that then will start frequency converter and motor according to conventional determination method, pressurized water supply is carried out,
That is, close rapidly after user opens water outlet control valve again, frequency converter and motor are activated this moment.At this
In the case of kind, user is not intended to starting motor in fact, in order to avoid this situation, by researching and analysing, compares
When user opens water outlet control valve, the pressure change of just common water (operation i.e. without closing rapidly) is (such as Fig. 4 institute
Show).It was found that there are a features: when user opens the difference of the turn-off time of water outlet control valve, pressure sensor institute
The discharge lateral pressure of sampling be also it is different, specific rule is the time interval and pressure between water outlet control valve open and close
The peak point Pp of force snesor sampling it is related (the two is inversely proportional, shutdown it is faster, highest hydraulic pressure point Pp is higher in pipeline).
The present invention is based on such a feature, devises the start-up criterion of pump variable frequency device: when the discharge side hydraulic pressure of pump samples
Value is lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1(detection is done in hydraulic pressure momentary fluctuation in order to prevent
It disturbs, preferably T1 More than or equal to 1ms) and a period of time T hereafter2Interior (T2 It is preferred that 0.1s~5s), side hydraulic pressure sampled value is discharged
Maximum value be less than it is preset second starting hydraulic pressure threshold value, then control frequency converter starting, otherwise, frequency converter does not start.In this way
The above problem can be effectively avoided, to reduce the starting of unnecessary frequency converter, water pump, extends equipment to a certain extent
Normal service life.
Frequency converter starts and stops control flow as shown in figure 5, specific as follows in intelligent water supply device of the present invention:
When user opens water outlet control valve, first by the effect of the current water storage static pressure of tank, start to be discharged, this
When pressure sensor sampling pressure of supply water value P can decline rapidly, when lower than tank minimum for hydrostatic pressure Pmin when and hold
Continue one section of preset time T1, and in a period of time T later2Interior, the maximum value Pp of the sampling pressure of supply water of pressure sensor is small
In PL (PL be it is preset second starting hydraulic pressure threshold value), that is to say, it is bright during this period of time, be not turned off valve or close valve
Small movement (because the hydraulic pressure that the movement for closing valve will make in pipeline increases), then start transducer drive booster water pump fortune
Row；If in stipulated time T2Interior, Pp is greater than PL, then illustrates in relation to valve closing door or the movement for turning down valve, in such cases
Frequency converter does not start.
After frequency converter starting, constant pressure water supply is realized by continuous PI or PID dynamic regulation.It specifically can be used existing each
Kind control strategy, details are not described herein again.
When user's water demand amount, which reduces the static pressure in pipeline, to be able to satisfy water demand or be not necessarily to water, use
Family turns down or closes water outlet control valve, at this time due to frequency converter continue drive booster water pump work and valve turns down or closes
It closes, therefore the pressure of supply water value in the pipeline of the sampling of pressure-detecting device becomes larger, i.e. the feedback pressure of PI or PID controller
Power becomes larger, when feedback pressure force value is greater than the command pressure value Pref of setting, the output frequency instruction of PI or PID controller
F starts to reduce, and the revolving speed of booster water pump starts to reduce, and when feedback hydraulic pressure value continues to increase, frequency instruction f continues to reduce, and works as f
Less than setting minimum value fmin and keep the time T set4(wherein T afterwards4 Preferably greater than or equal to 1s), then it controls frequency converter and stops
Machine.Alternatively, when user does not need with water, closing outlet valve, then in pipeline in booster water pump high power work
Hydraulic pressure can rise rapidly, at this time PI or PID controller also have not enough time to by output frequency instruct be adjusted to minimum value fmin with
Under, and the hydraulic pressure in pipeline has breached maximum pressure setting value, then ties up the case where hydraulic pressure is greater than maximum pressure setting value
The time T of one section of setting is held3(wherein T afterwards3 Preferably 1ms~1s, lower limit choose the transient wave that 1ms is hydraulic pressure in order to prevent
The dynamic influence generated to detection, it is in order to rapidly react overpressure situation that the upper limit, which takes 1s then), intelligence shuts down frequency converter.
Claims (6)
1. a kind of intelligent water supply device characterized by comprising
Pump, for being conveyed after being pressurized water；
Frequency converter, for driving the pump variable-speed operation；
Pressure sensor is sampled for the discharge side hydraulic pressure to the pump；
Control unit, for controlling the frequency converter, specifically such as to the control method of starting, the stopping of frequency converter
Under:
When discharge side hydraulic pressure sampled value lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1, and hereafter one
Section time T2Interior, the maximum value of discharge side hydraulic pressure sampled value is less than preset second starting hydraulic pressure threshold value, then controls frequency converter
Starting, otherwise, frequency converter does not start；
In frequency converter operational process, such as there is discharge side hydraulic pressure sampled value and shut down hydraulic pressure threshold value higher than preset and continue one section
Time T3Or the running frequency of frequency converter lower than preset minimum running frequency and continues for some time T4, then frequency converter is controlled
Stop；
First starting hydraulic pressure threshold value < the second starting hydraulic pressure threshold value < shuts down hydraulic pressure threshold value.
2. intelligent water supply device as described in claim 1, which is characterized in that in frequency converter operational process, control unit so that
The preset pressure that the discharge side hydraulic pressure of the pump is kept constant is that target controls frequency converter.
3. intelligent water supply device as claimed in claim 1 or 2, which is characterized in that described control unit is PI or PID control list
Member.
4. a kind of intelligent water supply method, which is characterized in that do variable-speed operation by transducer drive pump to convey after being pressurized water；
The starting of the frequency converter, method for controlling stopping are specific as follows:
When the discharge side hydraulic pressure sampled value of pump lower than preset first starting hydraulic pressure threshold value and maintains a period of time T1, and hereafter
A period of time T2Interior, the maximum value of discharge side hydraulic pressure sampled value is less than preset second starting hydraulic pressure threshold value, then controls change
The starting of frequency device, otherwise, frequency converter does not start；
In frequency converter operational process, preset shut down hydraulic pressure threshold value as the discharge side hydraulic pressure sampled value that occurs pumping is higher than and continue
A period of time T3Or the running frequency of frequency converter lower than preset minimum running frequency and continues for some time T4, then change is controlled
Frequency device stops；
First starting hydraulic pressure threshold value < the second starting hydraulic pressure threshold value < shuts down hydraulic pressure threshold value.
5. intelligent water supply method as claimed in claim 4, which is characterized in that in frequency converter operational process, so that the pump
The preset pressure that discharge side hydraulic pressure is kept constant is that target controls frequency converter.
6. the intelligent water supply method as described in claim 4 or 5, which is characterized in that carry out PI control or PID control to frequency converter.
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| CN201611073119.7A CN106499009B (en) | 2016-11-29 | 2016-11-29 | A kind of intelligent water supply device and method |
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| CN201611073119.7A CN106499009B (en) | 2016-11-29 | 2016-11-29 | A kind of intelligent water supply device and method |
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| CN106499009A CN106499009A (en) | 2017-03-15 |
| CN106499009B true CN106499009B (en) | 2019-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108894285B (en) * | 2018-07-26 | 2021-05-14 | 浙江达峰科技有限公司 | Method for judging whether liquid level of constant-pressure floating ball reaches set value |
| CN109231316A (en) * | 2018-11-28 | 2019-01-18 | 杭州和利时自动化有限公司 | A kind of control system of sewage disposal system |
| CN111219856B (en) * | 2019-12-30 | 2022-04-22 | 上海真聂思楼宇科技有限公司 | Air treatment equipment intelligent optimization group control device and method based on 5G communication |
| CN113757091A (en) * | 2020-06-05 | 2021-12-07 | 浙江大元泵业股份有限公司 | Control method for reducing frequent starting of pressure control type water pump |
| CN114281119B (en) * | 2021-12-23 | 2022-11-04 | 无锡汇田水务科技有限公司 | Water pressure control method, secondary water supply system, electronic device, and storage medium |
| CN114483558A (en) * | 2022-01-04 | 2022-05-13 | 威乐(中国)水泵系统有限公司 | Method, device and system for controlling state of water pump |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011390B (en) * | 2011-12-27 | 2016-09-21 | 株式会社荏原制作所 | Water supply installation and method of supplying water |
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| JPS59190494A (en) * | 1983-04-13 | 1984-10-29 | Hitachi Ltd | Controller for pressure of water supply pump |
| CN1055029A (en) * | 1990-03-17 | 1991-10-02 | 梁礼锐 | Fully automatic pressure-stabilizing water supply system |
| CN101634304A (en) * | 2008-07-25 | 2010-01-27 | 台达电子工业股份有限公司 | Constant-pressure fluid control method |
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| CN204139251U (en) * | 2014-09-11 | 2015-02-04 | 西北民族大学 | Based on the constant pressure water supply system of PLC |
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