CN103591032A - Method and device for monitoring flow instability degree of vane pump - Google Patents
Method and device for monitoring flow instability degree of vane pump Download PDFInfo
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- CN103591032A CN103591032A CN201310502543.9A CN201310502543A CN103591032A CN 103591032 A CN103591032 A CN 103591032A CN 201310502543 A CN201310502543 A CN 201310502543A CN 103591032 A CN103591032 A CN 103591032A
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Abstract
The invention discloses a method and a device for monitoring a flow instability degree of a vane pump. The method includes measuring a transient input voltage and a transient input current of a driving motor to compute transient input power of the motor; normalizing the transient input power; computing standard deviation of obtained normalized data; monitoring the flow instability degree of the pump by the aid of standard deviation values which are used as physical quantity values for measuring the current flow instability degree. The device comprises a signal acquisition module, a signal conditioning module, a signal processing module, an upper computer communication module and a human-computer interaction module; the transient voltage and the transient current of the motor can be acquired via the signal acquisition module and the signal conditioning module according to requirements of the human-computer interaction module on transmission and acquisition parameters, the transient power can be computed and normalized by the aid of the signal processing module, the standard deviation of the normalized data can be computed by the aid of the signal processing module, and results can be published via the upper computer communication module and can be displayed by the human-computer interaction module.
Description
Technical field
The present invention relates to fluid machinery test method field, refer in particular to a kind of monitoring method of vane pump flow instability degree, and the device of realizing this method.
Background technique
Vane pump is as important transformation of energy and fluid delivery system, is widely used in the sophisticated technology fields such as the each several part of national economy and Aero-Space.Therefore, reduce its energy consumption, improve security of operation and reliability, there is huge economic benefit, significant to improving China's Industry Development Level.The hydraulic performance of pump mainly refers to flow lift characteristic, efficiency characteristic etc., directly related with the energy-saving run ability of water pump.In recent years, increasing research showed that the unstable characteristic of pump internal flow and the external characteristics of pump were close association, was this quality factor that affects pump external characteristics.
The flow instability that affects pump inside is mainly that backflow, cavitation and Secondary Flow etc. are interfered, imported and exported to sound, the alternation axial force that the flow operating mode of these unstable characteristics produces and radial force are the main causes that causes bearing burn and seal break-off, these faults gently cause stop work and production, heavy can cause the catastrophic failures such as fire, these and pump safe operation and reliability are closely bound up.
Unstable degree while therefore judging timely and accurately the operation of pump is very important.And in the current documents and materials about the unstable research of pump internal flow, mainly reflected the reason that flowing instability produces, and the impact on pump operation when flowing instability, but about the monitoring of the unstable degree of centrifugal pump operation is seldom occurred.
Summary of the invention
When the flow instability of pump inside, its hydraulic load also can produce certain fluctuation accordingly, and the severe degree of this fluctuation and the degree of flowing instability directly related.Because the size of power input to machine and motor load be linear (in particularly little load range) almost, so motor can be used as a kind of effective load transducer.When the hydraulic load of pump produces fluctuation, the load torque on motor shaft also can produce fluctuation, also can produce corresponding fluctuation on power input to a machine simultaneously.Therefore can show by quantizing input power degree of fluctuation the degree of flowing instability.
The present invention is exactly on this basis, and a kind of monitoring method of centrifugal pump flow instability degree is provided, and the monitoring of the flowing instability degree of the device of realizing this method while realizing pump operation, to guarantee that centrifugal pump is reliable, energy-saving run.Technological scheme: for solving above technical problem, the present invention has adopted following technological scheme: a kind of monitoring method of vane pump flow instability degree, it is characterized in that: by measuring instantaneous input voltage and the electric current of drive motor, calculate the transient state input power of motor, and transient state input power is normalized, then the normalized data that obtain are carried out to standard deviation calculating, using standard deviation as the magnitude of physical quantity of weighing current flowing instability degree, realize the monitoring to pump flow instability degree.
A monitoring device for vane pump flow instability degree, is characterized in that: comprise signal acquisition module, signal condition module, signal processing module, Upper machine communication module and human-computer interaction module;
Signal acquisition module is according to the requirement of the defeated acquisition parameter of human-computer interaction module, by signal acquisition module and signal condition module, realize the collection of motor transient electric current and voltage, by signal processing module, realize the calculating of transient power, the normalized of transient power, the calculating of the standard deviation of normalization data, by Upper machine communication module, issue result, human-computer interaction module shows result.
Signal acquisition module comprises Hall voltage sensor and Hall current sensor, can measure the Dynamic Signal of the input voltage and input current of pump drive motor.
Signal processing module is according to the three-phase voltage V of the transient state having collected
Φ(t), current signal I
Φ(t), the motor transient input power P to motor according to the following formula
tot(t) calculate:
P
φ(t)＝V
φ(t)*I
φ(t)
P
tot(t)＝P
φa(t)+P
φb(t)+P
φc(t)
To the motor transient input power P calculating
tot(t), by being divided by and being normalized with its sliding average, then, to the normalized data that obtain, carry out standard deviation calculating.
Beneficial effect: the present invention, by quantizing to produce the monitoring that corresponding fluctuation realizes flow instability degree on power input to machine, has guaranteed that centrifugal pump is reliable, energy-saving run.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the monitoring device of a kind of vane pump flow instability of the present invention degree
Fig. 2 is that device of the present invention is installed and Acquisition Circuit schematic diagram.Fig. 3 is signal conditioning circuit figure.Fig. 4
For signal processing flow figure.
Fig. 5 is the diagram of dead point, the pass operating mode result after normalization.
Fig. 6 is the diagram of 0.5 times of optimum efficiency operating mode result after normalization.
Fig. 7 is the diagram of the optimum efficiency operating mode result after normalization.
Fig. 8 is the diagram of 1.2 times of optimum efficiency operating mode results after normalization.
Fig. 9 is the diagram of measurement result.
In figure, 1. water pump, 2. motor, 3. motor terminal, 4. motor power power supply, 5. Hall voltage sensor, 6. Hall current sensor, 7.DSP acquisition processing system, 8. human-computer interaction module, 9. upper-position unit, 10. operational amplifier, 11. low-pass filters.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of monitoring device of vane pump flow instability degree comprises signal acquisition module, signal condition module, signal processing module, Upper machine communication module and human-computer interaction module.
As shown in Figure 2, this device is installed on the drive motor (2) with pump (1) to be monitored, be connected with the power supply line of motor, by being embedded in the Hall voltage sensor (5) of PCB circuit board, join with motor terminal (3), power line to be measured, by Hall current sensor (6), can be realized to the measurement to related electrical parameters.By human-computer interaction module (8) the Input Monitor Connector time lag and circuit frequency acquisition, when water pump operation, by Hall voltage sensor (5) and Hall current sensor (6), can experience measured voltage and current information, and can be by the information of experiencing, by rule be for conversion into can collected system acquisition electrical signal, then these electrical signal are imported into DSP acquisition processing system (7), the signal gathering is first by signal conditioning circuit as shown in Figure 3, through operational amplifier (10) and interlock circuit thereof, input signal is isolated and follow, input signal is just nursed one's health to adapt to DSP Acquisition Circuit, then by low-pass filter (11), carry out anti-aliasing processing, eliminate High-frequency Interference, finally by DSP inner integrated A/D modular converter and data buffer zone, above-mentioned signal is carried out to timing sampling and storage.
In signal is processed, according to the three-phase voltage V of the transient state having collected
Φ(t), current signal I
Φ(t), the motor transient input power P to motor according to the following formula
tot(t) calculate:
P
φ(t)＝V
φ(t)*I
φ(t)
P
tot(t)＝P
φa(t)+P
φb(t)+P
φc(t)
Then in conjunction with the signal processing flow figure shown in Fig. 4, first to the motor transient input power P calculating
tot(t), by being divided by and being normalized with its sliding average.
As shown in Fig. 5 to Fig. 8, for carrying out the result after respective handling, as can finding out in its fluctuating range of best efficiency point, Fig. 5 to Fig. 8 to be significantly less than other operating modes, and the stronger operating mode of fluctuating range all appears at the low flow rate condition that flow instability degree is stronger, wherein closing the more obvious of dead point operating mode performance.
Then calculate the standard deviation of each sample, as shown in Figure 9, the result of gained also meets pump internal flow rule to its acquired results, and the point that flowing instability degree is minimum appears at best efficiency point, in the higher small flow region of flowing instability degree, its numerical value is also relatively high.The service data of last motor and water pump shows by human-computer interaction module, carries out communication by Upper machine communication module and upper-position unit (9) simultaneously.
Claims (4)
1. the monitoring method of a vane pump flow instability degree, it is characterized in that: by measuring instantaneous input voltage and the electric current of drive motor, calculate the transient state input power of motor, and transient state input power is normalized, then the normalized data that obtain are carried out to standard deviation calculating, using standard deviation as the magnitude of physical quantity of weighing current flowing instability degree, realize the monitoring to pump flow instability degree.
2. a monitoring device for vane pump flow instability degree, is characterized in that: described monitoring device comprises signal acquisition module, signal condition module, signal processing module, Upper machine communication module and human-computer interaction module;
Signal acquisition module is according to the requirement of the defeated acquisition parameter of human-computer interaction module, by signal acquisition module and signal condition module, realize the collection of motor transient electric current and voltage, by signal processing module, realize the calculating of transient power, the normalized of transient power, the calculating of the standard deviation of normalization data, by Upper machine communication module, issue result, human-computer interaction module shows result.
3. the monitoring device of the described a kind of vane pump flow instability degree requiring according to right 2, it is characterized in that: signal acquisition module comprises Hall voltage sensor and Hall current sensor, can measure the Dynamic Signal of the input voltage and input current of pump drive motor.
4. the monitoring device of the described a kind of vane pump flow instability degree requiring according to right 2, is characterized in that: signal processing module is according to the three-phase voltage V of the transient state having collected
Φ(t), current signal I
Φ(t), the motor transient input power P to motor according to the following formula
tot(t) calculate:
P
φ(t)＝V
φ(t)*I
φ(t)
P
tot(t)＝P
φa(t)+P
φb(t)+P
φc(t)
To the motor transient input power P calculating
tot(t), by being divided by and being normalized with its sliding average, then, to the normalized data that obtain, carry out standard deviation calculating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310502543.9A CN103591032B (en) | 2013-10-23 | 2013-10-23 | The monitoring method of a kind of vane pump flow instability degree and device |
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|---|---|---|---|
| CN201310502543.9A CN103591032B (en) | 2013-10-23 | 2013-10-23 | The monitoring method of a kind of vane pump flow instability degree and device |
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| Publication Number | Publication Date |
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| CN103591032A true CN103591032A (en) | 2014-02-19 |
| CN103591032B CN103591032B (en) | 2016-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233491A (en) * | 2014-10-13 | 2014-12-24 | 太仓苏纶纺织化纤有限公司 | Method for preparing porous nanofiber |
| CN110671341A (en) * | 2019-11-04 | 2020-01-10 | 江苏科技大学 | Centrifugal pump impeller damage diagnosis method and device based on sensorless monitoring technology |
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| EP1585205A2 (en) * | 2004-04-09 | 2005-10-12 | A.O. Smith Corporation | Controller for a motor and a method of controlling the motor |
| US20080288115A1 (en) * | 2007-05-14 | 2008-11-20 | Flowserve Management Company | Intelligent pump system |
| CN201377415Y (en) * | 2009-04-14 | 2010-01-06 | 海尔海斯(西安)控制技术有限公司 | Electrical control device for high-power slurry pump testing stand |
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2013
- 2013-10-23 CN CN201310502543.9A patent/CN103591032B/en not_active Expired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| EP1585205A2 (en) * | 2004-04-09 | 2005-10-12 | A.O. Smith Corporation | Controller for a motor and a method of controlling the motor |
| US20080288115A1 (en) * | 2007-05-14 | 2008-11-20 | Flowserve Management Company | Intelligent pump system |
| CN201377415Y (en) * | 2009-04-14 | 2010-01-06 | 海尔海斯(西安)控制技术有限公司 | Electrical control device for high-power slurry pump testing stand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233491A (en) * | 2014-10-13 | 2014-12-24 | 太仓苏纶纺织化纤有限公司 | Method for preparing porous nanofiber |
| CN110671341A (en) * | 2019-11-04 | 2020-01-10 | 江苏科技大学 | Centrifugal pump impeller damage diagnosis method and device based on sensorless monitoring technology |
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| CN103591032B (en) | 2016-12-07 |
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