CN208138124U - A kind of metering pump control system accurately controlling flow - Google Patents
A kind of metering pump control system accurately controlling flow Download PDFInfo
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- CN208138124U CN208138124U CN201820299571.3U CN201820299571U CN208138124U CN 208138124 U CN208138124 U CN 208138124U CN 201820299571 U CN201820299571 U CN 201820299571U CN 208138124 U CN208138124 U CN 208138124U
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Abstract
The utility model discloses a kind of metering pump control systems for accurately controlling flow.For deficiency present in the application of existing metering pump, propose that a kind of Metric Pump Flux Control System for accurately controlling flow, the Metric Pump Flux Control System include：Metering pump, buffer, flowmeter, controller and frequency converter, the instantaneous flow of metering pump output is accurately obtained by surge tank filtering, software filtering algorithm, instantaneous flow and setting flow calculate the output frequency of control frequency converter by controller by pid algorithm, to adjust the output flow of metering pump.The flow control system precision is high, high-efficient, can be widely applied to need the field for accurately and fast controlling metering pump discharge.
Description
Technical field
The present invention relates to the technical field of measuring equipment, in particular to a kind of metering pump control system for accurately controlling flow
System.
Background technique
Metering pump be it is a kind of can satisfy various stringent process flow needs, flow can in 100% range of 0- nothing
Grade is adjusted, for conveying a kind of special positive displacement pump of liquid (especially corrosive liquids).It is widely used in petroleum, chemical industry, Shui Chu
The fluid quantitative of the industries such as reason, food, pharmacy, environmental protection, medical instrument, which is added, adds (abbreviation fluid is determined ratio and added) with ratio,
Heart and engine as process industry.
In the application of existing metering pump, to achieve the purpose that control flow, usually there are two types of control programs.The first, leads to
It crosses manual rotary current regulation handle and then adjusts the flow of liquid.Second, metering pump speed is adjusted by adjusting frequency converter
Method realize flow adjust.But since metering pump belongs to positive displacement pump, flow is fluctuated at sine curve, can not be obtained in real time
The accurate flow for taking metering pump to export, causes both the above flow regulative mode all to have certain blindness, substantially reduces meter
Measure the service precision of pump.It is traditional if frequently to change flow in use process especially in chemical fibre and field of fine chemical
The control mode operating time is long, and flow control accuracy is low, and cumulative errors are big, is unable to satisfy process requirements.
Summary of the invention
The present invention proposes a kind of metering pump stream for accurately controlling flow for deficiency present in the application of existing metering pump
Amount control system, the flow control system precision is high, high-efficient, can be widely applied to need accurately and fast to control metering pump stream
The field of amount.
To realize, quickly accurate control metering pump discharge, Metric Pump Flux Control System proposed by the present invention include：
1) metering pump controls the flow of output fluid foods for trandfer fluid material and by revolving speed；
2) buffer, for playing the role of the flat wave of slicing to the pulsating flow that metering pump exports；
3) flow for detecting the instantaneous flow of output, and is transferred to controller with 4-20ma current signal by flowmeter
In；
4) controller for acquiring flow signal in real time, and is handled flow signal, comparison setting flow and reality
Flow controls the output of frequency converter by software algorithm；
5) frequency converter controls the revolving speed of metering pump, has reached control fluid by receiving the tach signal of controller output
The purpose of flow；
Heretofore described buffer primarily serves the effect of physics filtering.The capacity of surge tank is greater than metering pump
10 times or more of capacity can just obtain relatively good filter effect, installation nitrogen inlet, outlet and a gas at the top of surge tank
Body pressure gauge, liquid material entrance are mounted on surge tank side, height 60%- 70% or so, and outlet is mounted on buffer bottom
Portion.
Fluid foods are flowed by the top of buffer, bottom outflow.The pressure sensor installed at the top of surge tank is used for
The nitrogen pressure in surge tank is detected, when nitrogen pressure deficiency in tank, nitrogen is supplemented by nitrogen transfer valve, when nitrogen in tank
When hypertonia, nitrogen is discharged by nitrogen delivery valve.
Flowmeter of the present invention, it is desirable that flowmeter upstream flow development length at least should be 5 times of calibers, downstream straight pipe
Length is at least 3 times of calibers.Process duct must be concentric with sensor, is not more than 0.05DN with axis deviation.(DN refers to pipeline
Diameter)
Buffer in use, needs first to open metering pump, allows surge tank is interior to store a certain amount of material, it is desirable that object
Expect that liquid level is higher than the entrance of surge tank, and is no more than the 80% of surge tank height.
Heretofore described control system after the flow signal for receiving flowmeter, first carry out software filtering, filter
Glide filter or average value filtering can be used in algorithm.
It carries out being accumulated by integrated flow Q in timing cycle T by filtered flow signal, when timing cycle terminates
When, calculate average instantaneous flow F=Q/T.At the end of timing cycle, while integrated flow Q is cleared up, while entered next
A timing cycle carries out flux cumulating.
It will average instantaneous flow F and setting flow FsIt handles to obtain output valve by pid algorithm, and this output valve is converted
It is output in frequency converter at frequency converter frequency signal, plays the role of control metering pump discharge by controlling frequency converter revolving speed.
Detailed description of the invention
Fig. 1 is present system block diagram；
Serial number in Fig. 1 system block diagram is respectively：1) metering pump, 2) frequency converter, 3) nitrogen transfer valve, 4) pressure sensing
Device, 5) nitrogen delivery valve, 6) surge tank, 7) nitrogen pipeline, 8) fluid foods pipeline, 9) flowmeter, 10) controller
Fig. 2 is the control flow in controller of the present invention；
Specific embodiment
The invention discloses a kind of metering pump control systems for accurately controlling flow, by following embodiment and combine
Fig. 1 and Fig. 2 are illustrated.
Equipment used in this embodiment is as follows：
Metering pump, as shown in figure 1 shown in (1), using plunger metering pump, working flow 200L/h, motor uses 1.1kw frequency conversion
Motor；
Buffer, as shown in figure 1 shown in (6), capacity 2L；
Flowmeter, as shown in figure 1 shown in (9), using electromagnetic flowmeter, range 400L/h, (4ma couples of output signal 4-20ma
0L/h, 20ma is answered to correspond to 400L/h)；
Controller using Siemens's S7-300 controller, while being equipped with a 4-20ma mould as shown in figure 1 shown in (10)
Analog quantity input module and a 4-20ma analog output module.
Frequency converter, as shown in figure 1 shown in (2), using Siemens's MM440 frequency converter, power 1.5kw.
Firstly, pipeline installation is carried out according to figure one, by the input of the output access surge tank of metering pump, the output of surge tank
The input for accessing electromagnetic flowmeter installs pressure gauge and nitrogen transfer valve and nitrogen delivery valve at the top of surge tank.Installation
Electromagnetic Flow timing is to guarantee stability of flow, it is desirable that flowmeter upstream flow development length at least should be 5 times of calibers, downstream straight pipe
Length is at least 3 times of calibers.Process duct must be concentric with sensor, is not more than 0.05DN with axis deviation.(DN refers to pipeline
Diameter)
Then, it is electrically connected according to figure one, by the input signal access controller of flowmeter and pressure transmitter
Analog input mModule, by the analog input terminal of the analog signals access frequency converter of controller analog output module.
Frequency converter is connected with motor again.
After starting whole system, first manually opened metering pump, allows surge tank is interior to store a certain amount of material, it is desirable that material liquid
Position height is higher than the entrance of surge tank, and is no more than the 80% of surge tank height.
It is then turned on nitrogen transfer valve and nitrogen input method, adjustment buffering pressure inside the tank, while observing electromagnetic flowmeter
Flow curve writes down the pressure value on pressure transmitter at this time when flowed fluctuation minimum, simultaneously close off nitrogen transfer valve and
Delivery valve.
The flow signal for receiving flowmeter is carried out software filtering, filtering algorithm by the flow control plan in controller
Glide filter or average value filtering can be used.It carries out being accumulated by timing cycle T by filtered flow signal accumulative
Flow Q calculates average instantaneous flow F=Q/T at the end of timing cycle.At the end of timing cycle, while to integrated flow Q
It is cleared up, while entering next timing cycle and carrying out flux cumulating.It will average instantaneous flow F and setting flow FsPass through
Pid algorithm handles to obtain output valve, and this output valve is converted into frequency converter frequency signal and is output in frequency converter, passes through control
Frequency converter revolving speed plays the role of control metering pump discharge.
Controller detects and controls the pressure of surge tank simultaneously, when controller detects nitrogen pressure deficiency in tank, leads to
Nitrogen transfer valve supplement nitrogen is crossed, when nitrogen pressure is excessively high in tank, nitrogen is discharged by nitrogen delivery valve.
Claims (3)
1. a kind of metering pump control system for accurately controlling flow is used for metering pump flow control, including：
Metering pump controls the flow of output fluid foods for trandfer fluid material and by revolving speed；
Buffer, for playing the role of the flat wave of slicing to the pulsating flow that metering pump exports；
Flowmeter for detecting the instantaneous flow of output, and flow signal is transferred in controller；
Controller for acquiring flow signal in real time, and is handled flow signal, comparison setting flow and actual flow,
The output of frequency converter is controlled by software algorithm；
Frequency converter controls the revolving speed of metering pump, has reached control fluid flow by receiving the tach signal of controller output
Purpose.
2. the metering pump control system according to claim 1 for accurately controlling flow, which is characterized in that the appearance of surge tank
Amount is greater than 10 times or more of metering pump capacity, installation nitrogen inlet valve, nitrogen outlet valve and a gas at the top of surge tank
Pressure transmitter, liquid material entrance are mounted on surge tank side, height 60%-70% or so, and outlet is mounted on buffer bottom
Portion, buffer materials inside liquid level is higher than material inlet and is no more than the 80% of surge tank height when work.
3. the metering pump control system according to claim 1 for accurately controlling flow, which is characterized in that it is required that flowmeter
Upstream flow development length at least should be 5 times of calibers, and downstream flow development length is at least 3 times of calibers, and process duct is necessary with sensor
With one heart, it is not more than 0.05DN with axis deviation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299571.3U CN208138124U (en) | 2018-03-05 | 2018-03-05 | A kind of metering pump control system accurately controlling flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299571.3U CN208138124U (en) | 2018-03-05 | 2018-03-05 | A kind of metering pump control system accurately controlling flow |
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| CN208138124U true CN208138124U (en) | 2018-11-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167169A (en) * | 2018-03-05 | 2018-06-15 | 中芳特纤股份有限公司 | A kind of metering pump control system for accurately controlling flow |
| CN110410674A (en) * | 2019-07-31 | 2019-11-05 | 洛阳绿潮环保科技有限公司 | A kind of method that routine metering pump realizes small flow high-precision measuring filling |
| WO2020102958A1 (en) * | 2018-11-20 | 2020-05-28 | 中芳特纤股份有限公司 | Metering pump control system capable of accurately controlling flow rate |
-
2018
- 2018-03-05 CN CN201820299571.3U patent/CN208138124U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167169A (en) * | 2018-03-05 | 2018-06-15 | 中芳特纤股份有限公司 | A kind of metering pump control system for accurately controlling flow |
| WO2020102958A1 (en) * | 2018-11-20 | 2020-05-28 | 中芳特纤股份有限公司 | Metering pump control system capable of accurately controlling flow rate |
| CN110410674A (en) * | 2019-07-31 | 2019-11-05 | 洛阳绿潮环保科技有限公司 | A kind of method that routine metering pump realizes small flow high-precision measuring filling |
| CN110410674B (en) * | 2019-07-31 | 2020-10-02 | 洛阳绿潮环保科技有限公司 | Method for realizing small-flow high-precision metering and filling by conventional metering pump |
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