CN107842491A - A kind of membrane pump condition detection method - Google Patents
A kind of membrane pump condition detection method Download PDFInfo
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- CN107842491A CN107842491A CN201711047700.6A CN201711047700A CN107842491A CN 107842491 A CN107842491 A CN 107842491A CN 201711047700 A CN201711047700 A CN 201711047700A CN 107842491 A CN107842491 A CN 107842491A
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- membrane pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
A kind of membrane pump condition detection method is related to a kind of method of accurate measurements membrane pump running status.Present invention offer is a kind of simple and convenient, can accurately detect the detection method of membrane pump running status.It is a feature of the present invention that：Hall current sensor is set between frequency converter and membrane pump main motor, and Hall current sensor is connected with voltage transmitter, and the voltage signal that Hall current sensor exports is converted to current signal and is transferred to PLC signal input part by voltage transmitter；Main motor torque T is calculated in PLC, according to torque T, can learn the running status of membrane pump.
Description
Technical field
The present invention relates to a kind of method of accurate measurements membrane pump running status.
Background technology
Membrane pump is widely used for the mining equipment of chemical industry, mine and pipeline field, and it has output pressure
The advantages that high, sturdy and durable and chamber of septum is simple in construction, corrosion-resistant, and flow is unrelated with pressure, and it is very wide to adapt to pumped (conveying) medium
General, intake performance is good, efficiency high, therefore, vital work is played in many industrial circles such as mine tailing, water-coal-slurry, aluminum oxide
With.
Membrane pump is on the basis of piston pump, increases the diaphragm of rubber promoted by hydraulic oil in front of piston, reaches
Purpose that piston is abraded or corrodes is prevented to using diaphragm of rubber, therefore, membrane pump belongs to displacement pump as piston pump
One kind, its operation principle are as follows：
1. the alternating current of 50Hz power frequencies is carried out into frequency conversion by frequency converter first, and asynchronous motor is passed to,
Reach the purpose of speed governing driving, asynchronous motor is the power source of membrane pump mechanical part.
2. asynchronous motor in rotation process, drives reductor and then makes crank rotation, by the higher of asynchronous motor
Angular speed be changed into the relatively low angular speed of suitable membrane pump driving.
3. bent axle drivening rod crosshead and piston movement in rotation process, the rotational motion of bent axle is converted into piston
Linear reciprocating motion.
4. piston carries out linear reciprocating motion in piston cylinder, hydraulic oil is extruded repeatedly, it is done work, and hydraulic oil is by pressure
Diaphragm of rubber is sent to, reaches the purpose that pressure transmission is realized using hydraulic oil.
The Mechanical Driven principle of membrane pump is in above-mentioned part, the material conveying principle using lower part as membrane pump.
5. membrane pump is installed on transfer pipeline, the process upstream pipeline of membrane pump is pan feeding pipeline, downstream process pipe
Road is discharging pipeline, reaches the purpose for conveying material for material is pressurized using membrane pump, the pressure of pan feeding pipeline should be less than
Discharge loine pressure.
6. in front of diaphragm of rubber, there is the cavity of a receiving material, referred to as diaphragm cavity, the lower section and top of diaphragm cavity
It is connected respectively with pan feeding pipeline and discharging pipeline.
7. in the part that pipeline is connected with membrane pump respectively by turning have the one-way cock with spring, to prevent transported material
The reverse flow of material, two one-way cocks are separately installed with each diaphragm cavity, it allows flow direction to be from feeding pipe
Road direction flow direction discharging pipeline direction.
8. wherein, the one-way cock between pan feeding pipeline and diaphragm cavity is referred to as pan feeding one-way cock, for preventing
Material reverse flow is to pan feeding pipeline in diaphragm cavity；It is referred to as material list installed in discharging pipeline and the one-way cock before diaphragm cavity
To valve, for material in the pipeline that prevents from discharging, you first flow to diaphragm cavity.
9. when piston does advancing movement forwards, hydraulic oil is squeezed in piston cylinder, pressure rise, thing in diaphragm cavity
Material pressure is higher than pan feeding loine pressure, and also above discharging loine pressure, now, pan feeding one-way cock is closed, and discharge one-way cock
Open, material flows into discharging pipeline from diaphragm cavity, and this process is membrane pump acting process.
10. when piston cylinder rearward does extensional motion, hydraulic oil is reduced because of the release in space, pressure in piston cylinder, every
Material pressure is less than discharging loine pressure in membrane cavity, and also below pan feeding loine pressure, now, discharging one-way cock is closed, pan feeding
One-way cock is opened, and material flows into diaphragm cavity from pan feeding pipeline, and this process is membrane pump suction process.
Pan feeding one-way cock serves the side for ensureing the conveying acting of membrane pump material with discharging one-way cock in membrane pump
Tropism, it can be seen that piston often moves back and forth a cycle, and pan feeding one-way cock is respectively opened with discharging one-way cock, closes one
Secondary, because pan feeding one-way cock is different from the opening condition for the one-way cock that discharges, therefore, both can not open and close simultaneously.
In the conveying of actual material, by the property of membrane pump institute pumped (conveying) medium is different, when material particles are larger or
When in material doped with other impurities, in fruit granule or impurity insertion one-way cock check valve slideway, or it is squeezed and is attached to
The sealing surface of check valve, opening or closing for check valve can be caused to be obstructed, the sealing property of check valve be influenceed, in industrial production
In, such a failure situation is referred to as " card valve ", due to being provided with two check valves, i.e. pan feeding check valve, discharging in each chamber of septum
Check valve, and the state of each check valve has two kinds, that is, opens and be obstructed, close and be obstructed, therefore, card valve phenomenon can be divided into following
Four kinds of situations are discussed.
Discharge check valve：The effect of discharging check valve prevents discharging pipeline material flow from entering in diaphragm cavity, works as discharge nozzle
When road material flows into diaphragm cavity, while make diaphragm cavity pressure rise, barrier film cavity pressure is equal to discharging loine pressure, the pressure is remote
More than pan feeding loine pressure, the card valve for the check valve that discharges can be divided into following two situations：
It is obstructed 1. discharging check valve is opened：During piston is pushed ahead, if discharging check valve smooth can not be opened,
Then being greatly reduced in the piston progradation material feed flow, or even instantaneous delivery are reduced to 0, simultaneously as material is close
Close the extruding in space, it will cause the further rise of material pressure in diaphragm cavity, due to the rise of pressure, cause crankshaft torque
Increase and inverter current increase, the state be likely to result in due to pressure and torque it is excessive and caused by diaphragm of rubber
Or mechanical part infringement, it is also possible to cause due to electric current is excessive and caused by motor or frequency converter infringement.But, ordinary circumstance
Under, when discharging check valve can not be opened by obstructions such as particles, it hinders power very big, therefore, in barrier film cavity pressure
Further before rise, it is possible to because of barrier film cavity pressure and the increase of discharging pipeline pressure differential, and use material check valve and beaten
Open, and then make material inflow discharge nozzle road in diaphragm cavity make membrane pump recover to run well.As can be seen that card valve in this case
Its destructiveness is huge, but possibility occurrence is smaller, and has the possibility of self-recovery after occurring.
2. discharging closed check valve is obstructed：In piston backward drawing process, if discharging check valve can not be tight shut-off,
The material of discharging pipeline can not be then prevented inversely to flow into diaphragm cavity, now, piston stretches the material and hydraulic pressure made a concession out backward
Oily space can be filled up rapidly by the material from discharging pipeline, and material pressure is consistently equal to the loine pressure that discharges in diaphragm cavity.
According to membrane pump operation principle, the process should be membrane pump material sucting stage, but due in diaphragm cavity pressure discharged
Pipeline influences and is higher than pan feeding pipeline, material in pan feeding pipeline can not be flowed into diaphragm cavity by pan feeding check valve, in the situation
Under, its electric current is normal with piston drawing process for the piston progradation of membrane pump, but does not have material effective discharge from diaphragm cavity
Interior discharge, because the mass flow discharged in piston progradation will return to barrier film in next piston drawing process
Chamber.
Feed check valve：The effect of feed check valve is to prevent the material in diaphragm cavity from inversely flowing into feeding pipe, by
Feed pressure is relied primarily on relative to the pressure difference value of barrier film cavity pressure institute the raised area to complete in the opening of outlet valve, and one
As in the case of, feed pressure is all relatively low, and barrier film cavity pressure is able in piston drawing process due to the release in material space
Reducing, but be forever positive number, it can be seen that the maximum of feed pressure and diaphragm cavity pressure difference value is feed pressure value,
Because the pressure value is smaller, therefore, for the card valve compared with discharging check valve, the card valve of feed check valve is more common, and one
As for, the signified card valve in membrane pump term, be pan feeding check valve card valve.
3. feed check valve is opened and is obstructed：In piston backward drawing process, if feed check valve smooth can not be opened,
Material in pan feeding pipeline is effectively flowed into diaphragm cavity, or cause in pan feeding pipeline material to flow into diaphragm cavity deficiency, make every
Membrane pump volumetric efficiency reduces, when barrier film pump volumetric efficiency reduces, in next piston promotes stroke, due to thing in chamber of septum
Expect filling degree it is relatively low, barrier film chamber pressure rise it is slower, material from chamber of septum arrange to discharging pipeline it is also less, therefore, can cause
The propulsive force of piston is relatively low, i.e., crankshaft torque is relatively low, and then the electric current for being reflected as on inverter current the progradation is smaller.
4. feed check valve is closed and is obstructed：During piston is pushed ahead, if feed check valve can not be tight shut-off,
Material in diaphragm cavity can not be then prevented inversely to flow into feeding pipe road, now, equivalent to piston to the relatively low pan feeding pipeline of pressure
Conveying material, piston propulsive force and crankshaft torque are relative to smaller during normal work, correspondingly, motor and inverter current
It is smaller.
From the above-mentioned card valve analysis being directed under four kinds of different situations as can be seen that due to the difference of card valve situation, membrane pump
In the reaction of pressure, flow and electric current etc., its form of expression is also varied, but as can be seen that any shape on flow
The card valve of formula can cause the instantaneous reduction of flow, in relatively conventional feed check valve card valve analysis as can be seen that due to
The reduction of flow can also result in drastically reducing for motor and inverter current.
Card valve will cause pipeline material feed flow to fluctuate, and have for barrier film pumping unit and its pipeline technology huge
Harm, it embodies a concentrated expression of the following aspects：
1. influence the stability of downstream process feed：Downstream process as pipeline, it is often desired to upstream feeds pipe
The flow in road is even, when feed fluctuates, it is possible to which the production process for influenceing downstream in turn results in production
Quality Down, when even more serious, great production accident can be led to.By taking coal chemical industry as an example, the moment in coal chemical industry reacting furnace
It is directly connected in the displacement and redox reaction, the feed stability of coal that " carbon --- oxygen --- water " of high temperature occurs
The degree of stability of the reaction, if feed fluctuation exceedes permissible value, the oxygen coal ratio in reacting furnace will be influenceed, or even triggered anti-
Answer the blast of stove.
2. influence the service life of pipeline：The fluctuation of pipeline flow can produce pressure oscillation, Jin Erzao in transfer pipeline
Into the change of pipeline Impact direction, due to the reciprocating motion characteristics of diaphragm cavity, the change of pipeline Impact direction is also that the cycle is presented
Property back and forth change, the alternate stress can cause the fatigue of materials of pipeline, and may cause the rupture and leakage of pipeline, generally come
To say, pipe welding seam is the centrostigma of pipeline material stress, and the severely afflicated area of inner-walls of duct abrasion, therefore, the pressure of pipeline flow
The major consequences of fluctuation are embodied in the decline of the vibration of pipeline, the cracking of weld seam and pipeline life.
3. cause mains by harmonics：It is such a because the alternating change of pipeline flow will cause the alternating of loine pressure to change
Change is presented as electric current rise and fall drastically, spike harmonic wave pair caused by the rapidly change of this electric current on frequency converter
In the destruction of power network and the destruction of motor insulating capacity be all huge.
On traditional barrier film pumping unit, when card valve occurs, typically by operator to flow curve, pressure curve or
Current curve is observed, and carries out experienced judgement by organoleptic factors such as the equipment operation sounds, such a determination methods
Monitoring poor continuity, standard are difficult to unified, easily occur judging by accident or failing to judge, can not meet the protection needs of equipment, meanwhile, sentencing
During disconnected, because being influenceed when being judged by the equipment operation sound by apparatus body sound transmission, it also occur that card valve position
Judge indefinite drawback, be badly in need of a kind of new fault diagnosis technology and it is handled.
The content of the invention
The present invention is aiming above mentioned problem, there is provided and it is a kind of simple and convenient, it can accurately detect the inspection of membrane pump running status
Survey method.
In order to realize the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme that, it is a feature of the present invention that：Becoming
Hall current sensor is set between frequency device and membrane pump main motor, and Hall current sensor is connected with voltage transmitter, voltage
The voltage signal that Hall current sensor exports is converted to current signal and is transferred to PLC signal input part by transmitter；PLC
Main motor torque T is calculated, according to torque T, the running status of membrane pump can be learnt；The calculation formula of the torque T is：
Wherein AIFor the output current data of the PLC voltage transmitters collected, U is the driving voltage of main motor, KIFor suddenly
The transduction factor of your current sensor, KUFor the pick-up coefficient of voltage transmitter, n is the current revolution of main motor,Based on electricity
Acc power factor.
As a preferred embodiment of the present invention, the voltage transmitter is 0~5V signals to 4~20mA signal transmittings
Device.
Beneficial effects of the present invention：
The present invention, can be by the torque of PLC moment output motors, and according to torque, you can judge electricity according to above-mentioned formula
The running status of motivation, so as to can accurately judge whether membrane pump occurs card valve, ensure that the safe and stable operating of membrane pump.
Embodiment
It is a feature of the present invention that：Hall current sensor, Hall electricity are set between frequency converter and membrane pump main motor
Flow sensor is connected with voltage transmitter, and the voltage signal that Hall current sensor exports is converted to electric current by voltage transmitter to be believed
Number and be transferred to PLC signal input part；Main motor torque T is calculated in PLC, according to torque T, can learn the operation of membrane pump
State；The calculation formula of the torque T is：
Wherein AIFor the output current data of the PLC voltage transmitters collected, U is the driving voltage of main motor, KIFor suddenly
The transduction factor of your current sensor, KUFor the pick-up coefficient of voltage transmitter, n is the current revolution of main motor,Based on electricity
Acc power factor.
As a preferred embodiment of the present invention, the voltage transmitter is 0~5V signals to 4~20mA signal transmittings
Device.
Concrete operating principle of the present invention：
1. frequency converter：
Frequency converter is a kind of motor driving apparatus, and power supply and speed governing are played a part of in the rotation to motor, and frequency converter is by work
Frequency 50Hz Factory Electricity Supply is converted to the frequency that equipment is actually needed and is used to drive asynchronous motor, to reach controlled motor speed
Purpose, the operation principle of frequency converter is that the 5Hz alternating currents that factory provides are converted into DC power transmission extremely by rectification circuit
Dc bus inside frequency converter, and by IGBT via the power taking from dc bus, with by control the connection of direct current with
The mode of disconnection is converted to direct current in the alternating current of target frequency, and frequency converter not only has the energy of the frequency of regulation output electricity
Power, also there is the ability of regulation output voltage, therefore, also referred to as adjustable voltage, adjustable frequency (VVVF).
As a kind of equipment for integrating electric power driving force and control ability, its own also has based on micro- frequency converter
The signal sampling and trouble diagnosibility of electronic technology, the wherein signal sampling of frequency converter can make frequency converter pass through electric current and electricity
The change of pressure, sample by real-time parameters such as the voltage of motor, power, electric current, rotating speeds.
In real electrical machinery operating, to the status values that motor status parameter sampling is acquired due to random by sampling
Property with many factors such as noise jamming and show the more obvious fluctuation near actual value, in order that the sampled data is bent
Line is more smoothly easy to read, and processing is often filtered to sampled data, wherein comparing the filtering mode of main flow includes average
Filtering and digital filter.
The ACS800 model frequency converters that frequency converter model ABB AB is produced used by this programme, its signal sampling
Filtering mode is digital filter, and the signal that will be sampled fluctuates its curve more gentle, it is used by an Inertial Processing
Property filtering transmission function it is as follows：
As can be seen that because inertial element is in the introducing of sampling process, although improving the display effect of sampled signal,
It is due to the influence of transmission function denominator, frequency is more thanThe signal section of handing-over frequency receives the suppression of the wave filter, makes
Sampled result can not directly reflect the changing rule of actual signal.
Therefore, in this technique, on the basis of being driven by frequency converter to motor, electric current is increased in service cable
Sensor, by the electric current of current sensor direct measurement motor energizing cables, without what is directly fed back to using frequency converter
Current parameters are controlled, and the current fluctuation caused by avoiding card valve is filtered and made because of the interference of frequency converter filtering algorithm
Into sampling lag.
2. Hall current sensor
According to Faraday's electromagnetic induction law, the electric charge of motion can be by both perpendicular to charge movement direction in magnetic field
With the power of magnetic direction, Hall effect is one kind of electromagnetic induction, when have in the wire perpendicular to magnetic field electric current by when, when
Electric current perpendicular to external magnetic field pass through conductor when, the carrier of conductor is acted on by electromagnetic induction power, will be vertical at the same time
In producing an additional electric field on the sense of current and line of magnetic induction direction, so as to produce electrical potential difference, this potential at the both ends of conductor
Difference is also referred to as Hull voltage, and the direction of the electrical potential difference can be judged by left hand rule.
Hall current sensor make use of the principle of Hall effect, by a circular paramagnetic magnetic core by side wire, in magnetic
One Hall element is installed in the air gap of core, and Hall element is connected by amplifying circuit, by the Hall detected by Hall element
Electrical potential difference is amplified, and primary current is the size of current of tested wire, according to Faraday's electromagnetic induction law, the electrified wire
Gathered producing around the toroidal inductive magnetic field of wire, the magnetic field by the effect of magnetic core, Hall element is placed in magnetic core
In air gap, the Hull voltage of Hall element is applied to come the magnetic induction intensity of detection magnetic in-core by magnetic core, and then reflect former
The size of side electric current, the Hull voltage are amplified by operational amplification circuit, the output signal as Hall current sensor.
According to the operation principle of Hall current sensor, it can be seen that the component has following several respects feature：
A. signal form is voltage signal
B. isolation safe, high voltage is converted into low-voltage
C. by motor drive used in current signal be converted into voltage signal used in instrument
D. equipment volume is small, easy for installation.
In the design, current of electric 800A, using 3 185 cables, its a diameter of 31.8mm, therefore opened using 38mm
Hole, model HD-T211-38-C3, the model error amount are less than 0.2%, and the response time is less than 10ms, in general,
For the piston maximum jig frequency number of membrane pump at 46 beats/min or so, i.e. stroke interval is about 1304.3ms, in the stroke interval,
During generation card valve, requirement can be complied fully with by response time 10ms instrumentation；Measurement range is 10-60Hz, due to
The frequency speed adjustable range of membrane pump is 6-50Hz, can meet the needs of diaphragm pump motor current measurement completely.
3. 0-5V signals are to 4-20mA signal transmitting devices
In analog signalses transmission, in general has two kinds of transfer modes, and a kind of is the voltage by 0-5V direct currents
The size of linear expression physical quantity, such a mode have easy easy-to-use, transmitting module low cost and other advantages, but due to its signal
Numerical lower limits are 0V, and therefore, when signal numerical value is relatively low, analog module cannot be distinguished by the difference of 0V signals and rupture of line,
So as to cause the difficulty of fault diagnosis, simultaneously as voltage signal is influenceed in transmittance process by line resistance, and then shape
Into signal attenuation, it is impossible to which accurately the numerical value of signal is transmitted in expression, and therefore, such a mode is suitable only for gauge internal or instrument
Short-range signal transmission between table and transmitter.Another common signal transfer mode is current mode analog signalses, in electricity
In flow pattern analog signalses, two kinds are broadly divided into, i.e.,：0-20mA and 4-20mA signals, wherein 0-20mA signals are same because can not
0mA signals and rupture of line signal are distinguished and there is certain deficiency, therefore, herein, 4-20mA signals pair will be used
The current signal collected carries out pick-up.
The magnetic flux collected is changed into voltage signal by Hall current sensor by Hall effect principle, and is passed through
The signal is enlarged into the 0-5V analog signalses of standard by amplifying circuit, and equation below can be drawn according to Analog Circuits Analysis：
Io=I32=V32/R32=V31/R32=I31*R31/R32=Vi*R31/ (R29*R32)
As can be seen that its output current is with input voltage linear change.
In invention, the signal transmitting device of the SOC-VA-1 models produced using Zhong Taihua rising suns company.
Input signal is 0-5V voltage signals, and the 4-20mA current signals of output are converted to via the signal transmitting device, should
Transmitter needs outside to provide it 24V power supplys, to provide internal circuit working power and output amplification power supply.Due to the signal
There is electric current loop self-correcting capability to outside output, in certain loading range, the signal will appear as current source characteristic, i.e., defeated
Go out electric current not change different external loadings, it is thereby achieved that the signal transmission of relatively long distance carries without producing signal attenuation
The high transmission precision of signal.
4. the reading and processing of 4-20mA signals
The signal that sensor is collected is 4-20mA signals via signal transmitting device pick-up and is transferred into signal
PLC AI modules are read out, and in the present system, data signal are handled using west gate sub-brand name PLC, the CPU of the PLC
Model 6ES7-313-6CG04-0AB0, the CPU module are the CPU of the series of PLC of Siemens 300, and therefore, its AI module is equipped with
Also the series A I modules of Siemens 300 should be used, in the present system, AI modules model uses 6ES7-331-7KF02-0AB0, in profit
When carrying out magnitude of current measurement with the module, range card should be rotated to C gears, to carry out the measurement of the magnitude of current, and made
During with insulating power supply, it is necessary to which witness mark Mana terminals 11 and measured negative terminal M- (terminal 13,15,17,19) is mutual
Even, and with the terminal M (20) of module equipotential link is carried out, and carries out functional grounding, the reason for this is that:331-7KF02-
0AB0 is the module with isolation, is not electrically connected between CPU M ends and the reference point Mana of measuring circuit, therefore is measured
Be present a potential difference Uiso in the reference point Mana (terminal 11) and CPU of circuit M ends, if this value exceedes permissible value, will make
, can by using an equipotential link wire between Mana (terminal 11) and CPU M terminals into the interruption of analog signal
To ensure that Uiso is no more than permissible value.
5. the mathematical relationship of torque, Main motor current and barrier film pump pressure：
The 4-20mA magnitudes of current signal that PLC collects is can be seen that from above-mentioned narration to be exported with Hall current sensor
0-5V voltage signals and main motor driving current value linear relationship is presented, i.e., only there is simple number between each physical quantity
It is worth proportionate relationship, this convenience just given on the algorithm provided by PLC by calculating reduction motor drive current numerical value, that is, meets
Equation below：
A1=KUAU
AU=KII
Wherein AIThe 4-20mA current datas arrived for PLC analog acquisitions, AUFor the 0-5V electricity of Hall current sensor output
Press signal, KUFor the pick-up coefficient of the signal, I is the driving current numerical value of main motor, KIFor the sensing system of Hall current sensor
Number.Simple proportionate relationship is presented in above-mentioned formula, can pass through AIDirectly reflect I situation of change.
Main motor driving current is acted in the stator magnetic circuit of main motor, and mains power is provided for the rotation of main motor, should
The torque numerical value that current values provide with main motor meets the relation of equation below：
Wherein P is main motor current,For main motor power factor, n is current rotating speed, and U is main motor driving electricity
Pressure, from frequency converter voltage regulation and frequency modulation curvilinear equation, is linear function relation between its voltage and main motor rotating speed n, is at this
In system, the motor of selection is the motor that number of pole-pairs is 4, therefore its rotating speed is 1500r/min, rated voltage 690V, power factorFor 0.87, therefore, meet equation below between rotating speed n and voltage U：
Carrying it into torque formula to obtain：
Irrational number therein is taken into three decimal approximations, and power factor is brought into and can obtained：
The analog signalses that directly can be collected by this formula using PLC calculate the torque number of main motor output
Value.
It is understood that above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to this
Technical scheme described by inventive embodiments, it will be understood by those within the art that, still the present invention can be carried out
Modification or equivalent substitution, to reach identical technique effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (2)
- A kind of 1. membrane pump condition detection method, it is characterised in that：Hall electricity is set between frequency converter and membrane pump main motor Flow sensor, Hall current sensor are connected with voltage transmitter, the voltage that voltage transmitter exports Hall current sensor Signal is converted to current signal and is transferred to PLC signal input part；Main motor torque T is calculated in PLC, according to torque T, energy Learn the running status of membrane pump；The calculation formula of the torque T is：Wherein AIFor the output current data of the PLC voltage transmitters collected, U is the driving voltage of main motor, KIFor Hall electricity The transduction factor of flow sensor, KUFor the pick-up coefficient of voltage transmitter, n is the current revolution of main motor,For main motor work( Rate factor.
- A kind of 2. membrane pump condition detection method according to claim 1, it is characterised in that：The voltage transmitter is 0 ~5V signals are to 4~20mA signal transmitting devices.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212875U (en) * | 1987-11-20 | 1988-10-05 | 核工业部辐射防护研究所 | Low flow diaphragm pump |
| CN1977115A (en) * | 2004-05-13 | 2007-06-06 | Itt制造企业公司 | Torque controlled pump protection with mechanical loss compensation |
| GB2474691A (en) * | 2009-10-23 | 2011-04-27 | Inverter Drive Systems Ltd | Pump Control System And Method |
| CN103321916A (en) * | 2013-05-14 | 2013-09-25 | 江苏大学 | Water pump working condition monitoring method and device based on DSP embedded system |
| CN105201935A (en) * | 2015-10-27 | 2015-12-30 | 西安建筑科技大学 | Variable rotating speed hydraulic power supply flow control system and method |
-
2017
- 2017-10-31 CN CN201711047700.6A patent/CN107842491A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212875U (en) * | 1987-11-20 | 1988-10-05 | 核工业部辐射防护研究所 | Low flow diaphragm pump |
| CN1977115A (en) * | 2004-05-13 | 2007-06-06 | Itt制造企业公司 | Torque controlled pump protection with mechanical loss compensation |
| GB2474691A (en) * | 2009-10-23 | 2011-04-27 | Inverter Drive Systems Ltd | Pump Control System And Method |
| CN103321916A (en) * | 2013-05-14 | 2013-09-25 | 江苏大学 | Water pump working condition monitoring method and device based on DSP embedded system |
| CN105201935A (en) * | 2015-10-27 | 2015-12-30 | 西安建筑科技大学 | Variable rotating speed hydraulic power supply flow control system and method |
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Inventor after: Ling Xueqin Inventor after: Yan Zhaobin Inventor after: Sun Changming Inventor after: Dan Weiguang Inventor after: Chen Zheng Inventor after: Gong Ping Inventor after: Wang Guanying Inventor after: Wang Xinlong Inventor after: Gao Yi Inventor before: Ling Xueqin Inventor before: Yan Zhaobin Inventor before: Sun Changming Inventor before: Shan Weiguang Inventor before: Chen Zheng Inventor before: Gong Ping Inventor before: Wang Guanying Inventor before: Wang Xinlong Inventor before: Gao Yi |
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Application publication date: 20180327 |