CN105974840B - A kind of motor speed of pump and the control device and its method of flow measurement - Google Patents
A kind of motor speed of pump and the control device and its method of flow measurement Download PDFInfo
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- CN105974840B CN105974840B CN201610413108.2A CN201610413108A CN105974840B CN 105974840 B CN105974840 B CN 105974840B CN 201610413108 A CN201610413108 A CN 201610413108A CN 105974840 B CN105974840 B CN 105974840B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25341—Single chip programmable controller
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention relates to the control devices and its method of a kind of motor speed of pump and flow measurement, it belongs to control field.The present invention includes external speed probe, external flow meter, pulse signal unit, optocoupler signal circuit one, optocoupler signal circuit two, optocoupler signal circuit three, tach signal unit, flow signal unit and single-chip microcontroller, pulse signal unit and optocoupler signal circuit one are separately connected tach signal unit, the connection of tach signal unit and single-chip microcontroller, coil type inductive pick-up and frequency type output transducer are connected with pulse signal unit and optocoupler signal circuit one, optocoupler signal circuit two and optocoupler signal circuit three are separately connected flow signal unit, flow signal unit is connect with single-chip microcontroller, electromagnetic flowmeter and turbine flowmeter are connected with optocoupler signal circuit two and optocoupler signal circuit three respectively.Advantages of simple of the present invention is capable of measuring motor speed and flow, and measurement accuracy is high, and easy to operate, specificity is strong, can intuitively show measured value.
Description
Technical field
The present invention relates to a kind of devices and methods therefors, the control of motor speed and flow measurement more particularly, to a kind of pump
Devices and methods therefor, it is mainly used for the motor speed measurement of pump and mating for flow of liquid medium measurement with flowmeter, it
Belong to control field.
Background technique
The motor speed pumped in the prior art and flow measurement mainly use following several：1, the motor speed measurement pumped is normal
With having reflection method, Hall switch detection method and raster method；2, the flow measurement pumped has the stream such as electromagnetic flowmeter, turbine flowmeter
Quantity sensor measurement.
Problems and disadvantages existing for above two technology：They are discrete measurement, revolving speed to the motor speed and flow of pump
Measurement is only able to display revolving speed, shows without slip, rotor frequency and mains frequency；The flux unit switching of flow measurement is not square
Just, inconvenience is caused to people.
Publication date is on October 17th, 2012, in the Chinese patent of Publication No. 102734144A, discloses a kind of name
The referred to as patent of invention of " flow distributing system and flow allocation method ".The present invention includes rotation-speed measuring device, controller and stream
Measure control unit；Controller is connected with rotation-speed measuring device, for according to revolving speed-electric current corresponding relationship determination and engine
The current signal that revolving speed matches；Flow controlling unit is connected with controller, for according to current signal to the flow of pump into
Row adjusts distribution.It is discrete measurement to revolving speed and flow although the patent can carry out the measurement of revolving speed and flow to pump,
Tachometric survey is only able to display revolving speed, shows without slip, rotor frequency and mains frequency, thus its still have the defects that it is above-mentioned.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and a kind of device advantages of simple is provided,
It is capable of measuring motor speed and flow, measurement accuracy is high, and easy to operate, securely and reliably, specificity is strong, can intuitively show measured value
The motor speed of pump and the control device of flow measurement and its method.
The present invention solve the above problems used by technical solution be：The motor speed of the pump and the control dress of flow measurement
It sets, including external speed probe and external flow meter, the external speed probe includes coil type inductive pick-up and frequency
Rate formula output transducer, external flow meter include electromagnetic flowmeter and turbine flowmeter, it is characterised in that：It further include pulse signal
Unit, optocoupler signal circuit one, optocoupler signal circuit two, optocoupler signal circuit three, tach signal unit, flow signal unit,
Single-chip microcontroller, communication module, keyboard, numerical value display tube, LED light, transformer and optocoupler signal circuit four, the pulse signal
Unit and optocoupler signal circuit one are separately connected tach signal unit, the output end of the tach signal unit and the signal of single-chip microcontroller
Input terminal connection, the output end of coil type inductive pick-up and frequency type output transducer respectively with pulse signal unit and optocoupler
The input terminal of signal circuit one is connected；Optocoupler signal circuit two and optocoupler signal circuit three are separately connected flow signal unit, should
The output end of flow signal unit and the signal input part of single-chip microcontroller connect, the output end point of electromagnetic flowmeter and turbine flowmeter
It is not connected with the input terminal of optocoupler signal circuit two and optocoupler signal circuit three；The letter of the signal input part connection keyboard of single-chip microcontroller
Number output end, the signal input part of the display signal output end connection numerical value display tube of single-chip microcontroller, the status display of single-chip microcontroller are defeated
Outlet connects the input terminal of LED light, and the data transmission interface of single-chip microcontroller is connect with communication module, the signal input of single-chip microcontroller
The signal output end of end connection optocoupler signal circuit four, the signal output end of transformer and the signal of optocoupler signal circuit four input
End is connected；Advantages of simple is capable of measuring motor speed and flow, and measurement accuracy is high, and easy to operate, securely and reliably, specificity is strong, energy
Intuitive display measured value, the signal of coil type inductive pick-up is mV grades of sine wave signals, by filter circuit, low-frequency amplifier and
Light-coupled isolation is converted into pulse signal to tach signal switch unit；The frequency signal of frequency type output transducer through optocoupler every
From, signal transformation circuit to tach signal switch unit, which tach signal tach signal switch unit controls by single-chip microcontroller
It is input to single-chip microcontroller；Electromagnetic flowmeter and turbine meter frequency signal are through light-coupled isolation, signal transformation circuit to flow signal
Switch unit, flow signal switch unit control which flow signal is input to single-chip microcontroller by single-chip microcontroller；Function of the MCU is
Signal acquisition, data operation processing, data save and control modules work.
Preferably, pulse signal unit of the present invention is filter circuit, low-frequency amplifier and light-coupled isolation three parts
Composition；Sine wave signal is converted into pulse duration frequency signal.
Preferably, optocoupler signal circuit one of the present invention, optocoupler signal circuit two, optocoupler signal circuit three and optocoupler
Signal circuit four is light-coupled isolation and signal transformation circuit two parts composition.
Preferably, tach signal unit of the present invention is tach signal alternative switching circuit；It is controlled by single-chip microcontroller
Which tach signal input of signal.
Preferably, flow signal unit of the present invention is flow signal alternative switching circuit；It is controlled by single-chip microcontroller
Which flow signal input of signal.
Preferably, single-chip microcontroller of the present invention uses 8-bit microcontroller, model PIC16F877A；So that single-chip microcontroller
It is more acurrate to control signal.
Preferably, communication module of the present invention is 232 communication modules；It can be with computer communication.
Preferably, numerical value display tube of the present invention is divided to two windows, single window is by five LED seven segment digital tubes
Composition；So that display is more intuitive.
Preferably, frequency type output transducer of the present invention is using one in Hall sensor or photoelectric sensor
Kind；So that signal transmission is faster.
The present invention also provides the control methods of a kind of motor speed of pump and flow measurement, using described in claim 1-8
Pump motor speed and flow measurement control device, steps are as follows：（1）Pass through external speed probe and external flow
Meter, the motor speed sensor signal and flow meter signal of pump are all transmitted on single-chip microcontroller；（2）Signal is carried out by single-chip microcontroller
Acquisition, data operation processing, data save and the work of control modules；（3）Parameter setting and interface behaviour are carried out by keyboard
Make, numerical value display tube is divided to two windows, and left window shows that motor speed, slip, rotor frequency and mains frequency, right window are shown
The not flow and signal frequency under commensurate, the display state of LED light display window, transformer is as voltage transformer
It uses, acquires mains frequency, communication module and dataphone.
Compared with prior art, the present invention having the following advantages that and effect：1, device advantages of simple is capable of measuring motor speed
And flow, measurement accuracy is high, and securely and reliably, specificity is strong, can intuitively show measured value；2, real time response speed is fast, operation letter
Just, it is equipped with RS232 serial data standard interface, can be communicated with computer.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the embodiment of the present invention.
In figure：Pulse signal unit 1, optocoupler signal circuit 1, optocoupler signal circuit 23, optocoupler signal circuit 34 turn
Fast signal element 5, flow signal unit 6, single-chip microcontroller 7, communication module 8, keyboard 9, numerical value display tube 10, LED light 11 become
Depressor 12, optocoupler signal circuit 4 13, external speed probe 20, external flow meter 30, coil type inductive pick-up 201, frequency
Rate formula output transducer 202, electromagnetic flowmeter 301, turbine flowmeter 302.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, the motor speed of the present embodiment pump and the control device of flow measurement mainly include pulse signal unit
1, optocoupler signal circuit 1, optocoupler signal circuit 23, optocoupler signal circuit 34, tach signal unit 5, flow signal unit
6, single-chip microcontroller 7, communication module 8, keyboard 9, numerical value display tube 10, LED light 11, transformer 12, optocoupler signal circuit 4 13,
External speed probe 20 and external flow meter 30.
The present embodiment includes external speed probe 20 and external flow meter 30, and external speed probe 20 includes coil type
Inductive pick-up 201 and frequency type output transducer 202, external flow meter 30 include electromagnetic flowmeter 301 and turbine flowmeter
302, pulse signal unit 1 and optocoupler signal circuit 1 are separately connected tach signal unit 5, the output of the tach signal unit 5
End is connect with the signal input part of single-chip microcontroller 7, the output end of coil type inductive pick-up 201 and frequency type output transducer 202
It is connected respectively with the input terminal of pulse signal unit 1 and optocoupler signal circuit 1.
Optocoupler signal circuit 23 and optocoupler signal circuit 34 are separately connected flow signal unit 6 in the present embodiment, the stream
The output end of amount signal element 6 is connect with the signal input part of single-chip microcontroller 7, electromagnetic flowmeter 301 and turbine flowmeter 302 it is defeated
Outlet is connected with the input terminal of optocoupler signal circuit 23 and optocoupler signal circuit 34 respectively.
The signal output end of the signal input part connection keyboard 9 of single-chip microcontroller 7, the display signal of single-chip microcontroller 7 in the present embodiment
Output end connects the signal input part of numerical value display tube 10, and the status display output end of single-chip microcontroller 7 connects the defeated of LED light 11
Enter end, the data transmission interface of single-chip microcontroller 7 is connect with communication module 8, and the signal input part of single-chip microcontroller 7 connects optocoupler signal circuit
The signal output end of 4 13 signal output end, transformer 12 is connected with the signal input part of optocoupler signal circuit 4 13.
Pulse signal element 1 is filter circuit, low-frequency amplifier and light-coupled isolation three parts composition, optocoupler in the present embodiment
Signal circuit 1, optocoupler signal circuit 23, optocoupler signal circuit 34 and optocoupler signal circuit 4 13 are light-coupled isolation and letter
Number shaping circuit two parts composition.
Revolving speed signal element 5 is tach signal alternative switching circuit in the present embodiment, and flow signal unit 6 is flow letter
Number alternative switching circuit.
Single-chip microcontroller 7 uses 8-bit microcontroller 7, model PIC16F877A in the present embodiment, and communication module 8 is 232 communications
Module 8, numerical value display tube 10 are divided to two windows, and single window is made of five LED seven segment digital tubes, frequency type output sensing
Device 202 uses one of Hall sensor or photoelectric sensor.
The motor speed of the present embodiment pump and the control method of flow measurement, steps are as follows：（1）Pass through external revolution speed sensing
The motor speed sensor signal and flow meter signal of pump are all transmitted on single-chip microcontroller 7 by device 20 and external flow meter 30；（2）
Signal acquisition, data operation processing, data preservation and the work of control modules are carried out by single-chip microcontroller 7；（3）By keyboard 9
Parameter setting and interface operation are carried out, numerical value display tube 10 is divided to two windows, and left window shows motor speed, slip, rotor frequency
Rate and mains frequency, right window show flow and signal frequency under not commensurate, the display of 11 display window of LED light
State, transformer 12 are used as voltage transformer, acquire mains frequency, communication module 8 and dataphone.
201 measured motor revolving speed principle of the present embodiment middle line ring type inductive pick-up is the magnetic flux leakage sense according to asynchronous machine
Motor rotor frequency should be gone out, device also acquires mains frequency from working power, and formula calculates rotor frequency and mains frequency closes
Motor speed acquires in system.
The signal of the present embodiment middle line ring type inductive pick-up 201 is mV grades of sine wave signals, is put by filter circuit, low frequency
Big device and light-coupled isolation are converted into pulse signal to tach signal switch unit；The frequency signal of frequency type output transducer 202
Through light-coupled isolation, signal transformation circuit to tach signal switch unit, which tach signal switch unit controls by single-chip microcontroller 7
Tach signal is input to single-chip microcontroller 7；Electromagnetic flowmeter 301 and 302 frequency signal of turbine flowmeter are through light-coupled isolation, signal shaping
For circuit to flow signal switch unit, flow signal switch unit controls which flow signal is input to monolithic by single-chip microcontroller 7
Machine 7.
Sine wave signal is converted into pulse duration frequency signal by pulse signal element 1 in the present embodiment, and tach signal unit 5 is
Which tach signal input of signal controlled by single-chip microcontroller 7 for tach signal alternative switching circuit, and flow signal unit 6 is stream
Signal alternative switching circuit is measured, which flow signal input of signal controlled by single-chip microcontroller 7.
Sine wave signal is converted into pulse duration frequency signal by optocoupler signal circuit 4 13 in the present embodiment, and keyboard 9 is 4X4 key
Disk 9 is used for parameter setting and interface operation, and numerical value display tube 10 is divided to two windows, and single window is by five LED seven segment digital tubes
Composition, the display state of 11 display window of LED light, transformer 12 is 220V/12V transformer 12, as voltage transformer
It uses, acquires mains frequency.
The motor speed sensor signal and flow meter signal pumped in the present embodiment is all transmitted on the same device, monolithic
7 function of machine is signal acquisition, data operation processing, data save and control modules work.Device is by two display windows
Composition, left window show motor speed, slip, rotor frequency and mains frequency, right window show flow under not commensurate and
Signal frequency, parameter setting and interface operation are inputted by key panel, pass through 232 communication modules 8 and dataphone.
The control method of the present embodiment realizes a device and is just capable of measuring motor speed and flow, can be used as pump performance examination
The middle STANDARD MEASURING APPARATUS FOR as revolving speed and flow is tested, specificity is strong.
By above-mentioned elaboration, those skilled in the art can implement.
In addition, it should be noted that, the specific embodiments described in this specification, the shape of parts and components are named
Title etc. can be different, and above content is only to structure of the invention example explanation described in this specification.It is all according to
According to equivalence changes or simple change that the invention patent design structure, feature and principle is done, it is included in this hair
In the protection scope of bright patent.Those skilled in the art can do described specific embodiment various
The mode that the modify or supplement or adopt of various kinds is similar substitutes, and without departing from structure of the invention or surmounts present claims
Range defined in book, is within the scope of protection of the invention.
Claims (10)
1. a kind of motor speed of pump and the control device of flow measurement, including external speed probe（20）With external flow meter
（30）, the external speed probe（20）Including coil type inductive pick-up（201）With frequency type output transducer（202）,
External flow meter（30）Including electromagnetic flowmeter（301）And turbine flowmeter（302）, it is characterised in that：It further include pulse signal
Unit（1）, optocoupler signal circuit one（2）, optocoupler signal circuit two（3）, optocoupler signal circuit three（4）, tach signal unit
（5）, flow signal unit（6）, single-chip microcontroller（7）, communication module（8）, keyboard（9）, numerical value display tube（10）, LED light
（11）, transformer（12）With optocoupler signal circuit four（13）, the pulse signal unit（1）With optocoupler signal circuit one（2）Point
It Lian Jie not tach signal unit（5）, the tach signal unit（5）Output end and single-chip microcontroller（7）Signal input part connection, line
Ring type inductive pick-up（201）With frequency type output transducer（202）Output end respectively with pulse signal unit（1）And optocoupler
Signal circuit one（2）Input terminal be connected；Optocoupler signal circuit two（3）With optocoupler signal circuit three（4）It is separately connected flow letter
Number unit（6）, the flow signal unit（6）Output end and single-chip microcontroller（7）Signal input part connection, electromagnetic flowmeter
（301）And turbine flowmeter（302）Output end respectively with optocoupler signal circuit two（3）With optocoupler signal circuit three（4）It is defeated
Enter end to be connected；Single-chip microcontroller（7）Signal input part connect keyboard（9）Signal output end, single-chip microcontroller（7）Display signal output
End connection numerical value display tube（10）Signal input part, single-chip microcontroller（7）Status display output end connect LED light（11）'s
Input terminal, single-chip microcontroller（7）Data transmission interface and communication module（8）Connection, single-chip microcontroller（7）Signal input part connect optocoupler
Signal circuit four（13）Signal output end, transformer（12）Signal output end and optocoupler signal circuit four（13）Signal it is defeated
Enter end to be connected.
2. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The pulse
Signal element（1）For filter circuit, low-frequency amplifier and light-coupled isolation three parts composition.
3. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The optocoupler
Signal circuit one（2）, optocoupler signal circuit two（3）, optocoupler signal circuit three（4）With optocoupler signal circuit four（13）It is optocoupler
Isolation and signal transformation circuit two parts composition.
4. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The revolving speed
Signal element（5）For tach signal alternative switching circuit.
5. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The flow
Signal element（6）For flow signal alternative switching circuit.
6. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The monolithic
Machine（7）Using 8-bit microcontroller, model PIC16F877A.
7. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The communication
Module（8）For 232 communication modules.
8. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The numerical value
Display tube（10）It is divided to two windows, single window is made of five LED seven segment digital tubes.
9. the motor speed of pump according to claim 1 and the control device of flow measurement, it is characterised in that：The frequency
Formula output transducer（202）Using one of Hall sensor or photoelectric sensor.
10. a kind of motor speed of pump and the control method of flow measurement, using pump described in any one of claim 1-9
The control device of motor speed and flow measurement, it is characterised in that：Steps are as follows
（1）Pass through external speed probe（20）With external flow meter（30）, by the motor speed sensor signal and flow of pump
Meter signal is all transmitted to single-chip microcontroller（7）On；
（2）Pass through single-chip microcontroller（7）Carry out signal acquisition, data operation processing, data preservation and the work of control modules；
（3）By keyboard（9）Carry out parameter setting and interface operation, numerical value display tube（10）It is divided to two windows, left window display electricity
Machine revolving speed, slip, rotor frequency and mains frequency, right window show flow and signal frequency under not commensurate, LED indication
Lamp（11）The display state of display window, transformer（12）It is used as voltage transformer, acquires mains frequency, communication module
（8）With dataphone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610413108.2A CN105974840B (en) | 2016-06-14 | 2016-06-14 | A kind of motor speed of pump and the control device and its method of flow measurement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610413108.2A CN105974840B (en) | 2016-06-14 | 2016-06-14 | A kind of motor speed of pump and the control device and its method of flow measurement |
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| CN105974840B true CN105974840B (en) | 2018-11-27 |
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| CN109975573A (en) * | 2019-03-12 | 2019-07-05 | 浙江工业大学 | The speed measuring device of centrifugal pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204341Y (en) * | 1994-04-12 | 1995-08-02 | 煤炭科学研究总院杭州环境保护研究所 | Testing table for submersible electric pump |
| CN202614292U (en) * | 2012-06-13 | 2012-12-19 | 丹东市环欣电子有限公司 | Intelligent fluid flow meter |
| CN202883394U (en) * | 2012-10-24 | 2013-04-17 | 上海安悦节能技术有限公司 | Water pump efficiency analysis device |
| CN104165761A (en) * | 2014-08-08 | 2014-11-26 | 江苏大学 | Comprehensive performance tester for hard hose traveler |
| CN205809615U (en) * | 2016-06-14 | 2016-12-14 | 浙江省机电设计研究院有限公司 | The motor speed of a kind of pump and the control device of flow measurement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9618913B2 (en) * | 2013-04-29 | 2017-04-11 | Hamilton Sundstrand Corporation | Self powered fluid metering units |
-
2016
- 2016-06-14 CN CN201610413108.2A patent/CN105974840B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204341Y (en) * | 1994-04-12 | 1995-08-02 | 煤炭科学研究总院杭州环境保护研究所 | Testing table for submersible electric pump |
| CN202614292U (en) * | 2012-06-13 | 2012-12-19 | 丹东市环欣电子有限公司 | Intelligent fluid flow meter |
| CN202883394U (en) * | 2012-10-24 | 2013-04-17 | 上海安悦节能技术有限公司 | Water pump efficiency analysis device |
| CN104165761A (en) * | 2014-08-08 | 2014-11-26 | 江苏大学 | Comprehensive performance tester for hard hose traveler |
| CN205809615U (en) * | 2016-06-14 | 2016-12-14 | 浙江省机电设计研究院有限公司 | The motor speed of a kind of pump and the control device of flow measurement |
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