CN206159060U - Centrifugal pump cavitation monitoring devices - Google Patents
Centrifugal pump cavitation monitoring devices Download PDFInfo
- Publication number
- CN206159060U CN206159060U CN201621141883.9U CN201621141883U CN206159060U CN 206159060 U CN206159060 U CN 206159060U CN 201621141883 U CN201621141883 U CN 201621141883U CN 206159060 U CN206159060 U CN 206159060U
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- signal
- cavitation
- sound wave
- microprocessor
- centrifugal pump
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Abstract
The utility model discloses a centrifugal pump cavitation monitoring devices, include: a plurality of cavitation monitor cell, this cavitation monitor cell are ultrasonic transducer, this ultrasonic transducer including power be less than 10w the transmitting terminal, and with transmitting terminal matched with receiving terminal, this receiving terminal is used for receiving the ultrasonic signal that comes from the transmitting terminal direction, just turns into sound wave analog signal with received ultrasonic signal, the amplifier for receive and enlarge sound wave analog signal, the AD converter for elementary analog signal transition after will enlargeing becomes sound wave data signal, microprocessor for it comes from the sound wave data signal of AD converter and exports corresponding feedback signal to receive the judgement, output unit is controlled by microprocessor and shows received feedback signal. The utility model discloses the better prediction cavitation inception of ability carries out whole real -time supervision to the cavitation process, can automatic adapt to the signal change that factors such as ambient temperature, installation difference lead to, avoids reporting by mistake.
Description
Technical field
This utility model is related to a kind of monitoring device, especially a kind of centrifugal pump cavitation monitoring device.
Background technology
When cavitation is referred to below the critical pressure for vaporization of the reduced pressure in liquid to Current Temperatures, liquid is vaporized
The state for forming cavity, these vacuolizations and development is referred to as cavitation.In centrifugal pump, cavitation phenomenon is concentrated mainly on leaf
Impeller blade entrance, the energy exchange of liquid is interfered and destroys when cavitation occurs, and causes pump operation characteristic changing, vibration to make an uproar
A series of problems, such as sound, material corrosion, structural deterioration, when serious pump liquid stream can interrupt, it is impossible to normal work.Therefore to centrifugation
The grasp of cavitation situation is significant to the safe and stable of pump, Effec-tive Function in pump, and is based on ultrasonic sensor monitoring
Centrifugation pump cavitation situation is a kind of effective method.
It is existing monitoring centrifugal pump cavitation inception method mainly have noise measuring method, tonometry, vibration measurement method and
High Speed Photography.Because the process that cavitation occurs development is very short, and all may occur in whole working range, therefore cavitation
It is difficult to predict.Pre- anti-cavitation best bet is exactly to set up cavitation monitoring system, and to its running status whole real-time monitoring is carried out,
The occurrence and development of cavitation are found and prevented in time.Monitoring of the lot of domestic and international scholar to cavitation has carried out substantial amounts of research, but
Its object of study mostly concentrates on hydraulic turbine model and its prototype, and monitoring method also mainly with High Speed Photography and vibratory drilling method is
It is main.
The cavitation performance context of detection of pump, domestic and international method is a lot, mainly there is vibratory drilling method, electrical measuring method, pressure pulsation method, energy
Mensuration and Noise Method etc..Although existing on-line detecting system input commercial Application, because cavitation signal extraction difficulty is big, detection
Sensitivity is low, lack the deficiencies such as quantitative analyses so that these achievements in research are not promoted on a large scale.Existing online inspection
Mechanism, influence factor and the destruction that examining system occurs to cavitation is not all understood completely, but also can not accurately detect
To cavitation inception.
Utility model content
In order to overcome the deficiencies in the prior art, this utility model provides a kind of preferably prediction cavitation inception, to cavitation
Process carries out whole real-time monitoring, so as to be found in time according to monitoring result and prevents the centrifugal pump of cavitation occurrence and development empty
Change monitoring device.
This utility model solves the technical scheme that its technical problem adopted：A kind of centrifugal pump cavitation monitoring device, bag
Include：
Some cavitation monitoring units, the cavitation monitoring unit is ultrasonic transducer, and the ultrasonic transducer includes active
Transmitting terminal and the receiving terminal that with transmitting terminal be engaged of the rate less than 10w, the receiving terminal is used to receive from the super of transmitting extreme direction
Acoustic signals and received ultrasonic signal is converted into into sound wave analogue signal；
Amplifier, for receiving sound wave analogue signal is amplified；
A/D converter, for the primary analogue signal after by amplification sound wave digital signal is converted into；
Microprocessor, judges the sound wave digital signal from A/D converter and exports corresponding feedback letter for receiving
Number；
Output unit, is controlled by microprocessor and shows received feedback signal.
The beneficial effects of the utility model are：The function of making traditional sensors is expanded to by conventional " infomation detection " effect
Have the function of " information processing " concurrently, transmitting terminal and receiving terminal are satisfied with respectively on pump conduit, using ultrasound wave receiving terminal signal gathered,
And suitably amplify after give with A/D conversion and data-handling capacity microprocessor realize digital filtering, fuzzy diagnosis and point
Resolution selection etc., it can automatically adapt to ambient temperature, install signal intensity caused by the factors such as difference, it is to avoid wrong report.Why
From ultrasonic transducer, it is because that ultrasound wave is very big to the penetrating power of liquid, solid, and impurity or separating surface meeting ought be encountered
Significantly reflection is produced, the signal that correspondingly ultrasound wave receiving terminal is received is with regard to substantially decrease, therefore reaction is sensitive accurate, reduces missing
Sentence.In addition, relative to the performance of infrared sensor, ultrasound wave has that frequency is high, wavelength is short, diffraction phenomenon is little, particularly direction
Property is good, can become ray and the features such as direction propagation.In due to tradition application, ultrasound wave is the trigger for producing cavitation
One of, common purposes is to reach the function of object surface cleaning by cavitation, therefore, no one will recognize that, cannot also use super
Sound wave goes the enlightenment for monitoring Hollow fluid situation.Why this utility model can reach cavitation monitoring using ultrasound wave, be because
Obtained by theory analysis and practical operation for applicant, when the power of the transmitting terminal of ultrasonic transducer is less than 10w, fluid is simultaneously
Ultrasonic cavitation will not be produced because of the presence of ultrasound wave, therefore, taking a reasonable power bracket can exactly realize monitoring, and have
How body power is chosen, material, thickness, fluid composition, viscosity depending on institute's installation pipeline etc., it is only necessary to entered according to environment
Row adjustment, has no effect on the realization of this utility model purpose.
The threshold signal of cavitation in conventional conduit is preset with microprocessor, is also included：Timing unit, for recording each sky
Change time when monitoring means sense cavity and pass through connection with microprocessor；Comparison unit, for comparing sound wave number
The energy size of word signal and threshold signal simultaneously will be more than the sound wave digital data transmission of threshold signal energy to microprocessor.
Timing unit monitors cavity change in flow, and by contrast unit has bubbly flow situation and is compared with liquid in normal pipeline,
So as to monitor cavitation development.Wherein, timing unit mainly senses the time difference of cavity, phase by each cavitation monitoring unit
That what is answered shows the change of cavity flow velocity, the development of the same cavitation of reflection indirectly of change of pump conduit flow；Comparison unit will just
The threshold values of Chang Guanlu cavitations is contrasted with sound wave digital signal, so as to more in depth reflect cavitation development.
Centrifugal pump cavitation monitoring device is also included：Sensitivity adjusting unit, for adjust the threshold signal size and
Pass through connection with microprocessor.For different pump conduits, the threshold of sensitivity (i.e. threshold signal) for adjusting cavity is needed,
Control monitoring cavitation produces scope.Main Means are that the size that cavity is produced in liquid can directly cause the low electricity of comparator output terminal
The change of flat persistent period, adjusting divide ratio can just change the spilling time of enumerator, also can just adjust the cavity threshold of sensitivity
Value.
Centrifugal pump cavitation monitoring device also includes monitoring pipeline, each ultrasonic transducer along monitoring pipe lengths according to
Secondary arrangement, and the transmitting terminal and receiving terminal of ultrasonic transducer is accordingly installed on the week side of boss of monitoring pipeline.Due to pipeline surface
Situation is each different, in order to improve the precision and accuracy of monitoring, so that centrifugal pump cavitation monitoring device comes with monitoring pipe
Road, it is only necessary to which monitoring pipeline is serially connected with pump conduit.So operate, can avoid because different pipeline materials and thickness
Increase the adjustment difficulty of threshold signal so that more convenient to operate, accuracy is also higher.
Further preferred scheme：The power of transmitting terminal is 5w.Both can ensure that.
Description of the drawings
Fig. 1 is the system block diagram of this utility model embodiment.
Fig. 2 is the sensitivity adjusting unit of this utility model embodiment.
Specific embodiment
This utility model is further described below in conjunction with the accompanying drawings：
As shown in figure 1, the present embodiment includes microprocessor 1, some cavitation monitoring units, amplifier 31, A/D converter
32 and output unit (not shown).Cavitation monitoring unit is ultrasonic transducer, and the ultrasonic transducer 2 includes power for 5w
Transmitting terminal 21 and the receiving terminal 22 that is engaged with transmitting terminal 21, the receiving terminal 22 is used to receive from the direction of transmitting terminal 21
Ultrasonic signal and received ultrasonic signal is converted into into sound wave analogue signal；Amplifier 31 is used to receive amplification sound
Wave simulation signal；Primary analogue signal after A/D converter 32 is used for amplification is converted into sound wave digital signal；Microprocessor 1
Judge the sound wave digital signal from A/D converter 32 and export corresponding feedback signal for receiving.Output unit is controlled by
Microprocessor 1 simultaneously shows received feedback signal, the output unit 1 can using display or collection of illustrative plates printer etc. other
Any equipment that can realize information output.Microprocessor can be single-chip microcomputer, can adopt Japan NEC8 positions High Performance SCM NEC
78K0/Kx1+ is serial；Or other are any with the microcomputer for calculating processing function.
The threshold signal of cavitation in conventional conduit is preset with microprocessor 1, the present embodiment also includes the He of timing unit 41
Comparison unit 42, timing unit 41 is used for the time recorded when each cavitation monitoring unit senses cavity and leads to microprocessor 1
Cross connection；Comparison unit 42 is used to compare the energy size of sound wave digital signal and threshold signal and will believe more than threshold values
The sound wave digital data transmission of number energy is to microprocessor 1.Timing unit 41 monitor cavity change in flow, by contrast unit 42 with
In normal pipeline there is bubbly flow situation and be compared in liquid, so as to monitor cavitation development.Wherein, timing unit 41 is led
The time difference of cavity is sensed by each cavitation monitoring unit, the change of cavity flow velocity, pump conduit flow are shown accordingly
The same cavitation of reflection indirectly of change development；Comparison unit 42 enters the threshold values of normal pipeline cavitation and sound wave digital signal
Row contrast, so as to more in depth reflect cavitation development.D.C. regulated power supply provides energy for ultrasonic transducer, according to originally connecing
It is just much of that the characteristics of receiving end, only needs to about tens volts of voltages, can typically select the limit within safe voltage, in selecting circuit
Leakage resistance, to limit ultrasonic energy, pulse-generating circuit produces certain frequency square wave, the conversion of supply waveform and driving electricity
Road, pulse frequency here should be consistent with the resonant frequency of piezoelectric chip, when the frequency and chip that are added to two ends alternating voltage
Resonant frequency it is equal when, the energy of output is maximum, sensitivity also highest.Receive and use in ultrasonic transducer 2, receiving terminal 22
Resonant frequency should be consistent with transmitting terminal 21, and it is received from the ultrasound wave decayed through after tube wall, air-gap and liquid
Signal, this signal is fainter, and the comparator chip of high input impedance, Jing and reference voltage are given Jing after diode double limiting
Relatively produce pulse signal, to identify liquid in whether be mixed with bubble.
The present embodiment also includes sensitivity adjusting unit 5, and the sensitivity adjusting unit 5 is big for adjusting threshold signal
It is little and with microprocessor 1 pass through connection.For different pump conduits, need to adjust the threshold of sensitivity (the i.e. threshold values of cavity
Signal), control monitoring cavitation produces scope.Main Means are that the size that cavity is produced in liquid can directly cause comparator to export
The change of end low duration, adjusting divide ratio can just change the spilling time of enumerator, also can just adjust cavity spirit
Sensitivity threshold value.As shown in Fig. 2 sensitivity adjusting unit 5 is sensitivity adjusting circuit, clock oscillation 51 in sensitivity adjusting circuit
Circuit produces clock signal, and the clock end of binary addition impulse scaler is sent to Jing after programmable frequency divider, and ultrasound wave is examined
Survey 52 electric circuit inspection to ultrasonic pulse signal be added in the impulse scaler " clearing " end.Single cavity is mixed in liquid
Size can directly cause the change of comparator output terminal low duration, adjust the divide ratio of programmable frequency divider with regard to energy
Change up counter and overflow the time, also can just adjust sensitivity of the level threshold value, the scope that control monitoring cavitation inception is produced.Have
Can also be reported to the police by 55 circuits of triggering of reporting to the police when needs.
In order to improve monitoring accuracy and accuracy, it is to avoid because different pipeline materials and thickness increase the adjustment of threshold signal
Difficulty, the present embodiment also includes monitoring pipeline 6, and each ultrasonic transducer 2 is arranged successively along monitoring pipe lengths, and super
The transmitting terminal 21 and receiving terminal 22 of acoustic wave transducer 2 is accordingly installed on the week side of boss of monitoring pipeline 6.
In this utility model, the function of ultrasonic sensor is expanded to by conventional " infomation detection " effect and have " letter concurrently
The function of breath process ", this is its maximum feature.In addition, being different from other detection modes, it belongs to non-contact type detection, to reality
The impact tested is less, the accuracy of Enhancement test result.Transmitting terminal 21 and receiving terminal 22 are satisfied with respectively on pump conduit, using ultrasound
Ripple receiving terminal 22 gathers signal, and gives after suitably amplifying and realize number with A/D conversions and the microprocessor 1 of data-handling capacity
Word filtering, fuzzy diagnosis and resolution selection etc., it can automatically adapt to ambient temperature, install signal change caused by the factors such as difference
Change, it is to avoid wrong report.Why ultrasonic transducer is selected, be because that ultrasound wave is very big to the penetrating power of liquid, solid, and worked as
Encountering impurity or separating surface can produce significantly reflection, and the signal that correspondingly ultrasound wave receiving terminal 22 is received just substantially weakens, therefore
Reaction is sensitive accurately, reduces erroneous judgement.Additionally, producing working pulse, expansion bus by using timer internal realizes that data are handed over
The technology such as change, it is possible to reduce other peripheral chip usage amounts, the volume that reduces, improve cost performance, strengthen capacity of resisting disturbance, using should
Method can in advance prevent the cavitation inception of centrifugal pump.
Claims (5)
1. a kind of centrifugal pump cavitation monitoring device, is characterized in that, including：
Some cavitation monitoring units, the cavitation monitoring unit is ultrasonic transducer, and it is little that the ultrasonic transducer includes power
In the transmitting terminal of 10w and the receiving terminal being engaged with transmitting terminal, the receiving terminal is used to receive the ultrasound wave from transmitting extreme direction
Signal and received ultrasonic signal is converted into into sound wave analogue signal；
Amplifier, for receiving sound wave analogue signal is amplified；
A/D converter, for the primary analogue signal after by amplification sound wave digital signal is converted into；
Microprocessor, judges the sound wave digital signal from A/D converter and exports corresponding feedback signal for receiving；
Output unit, is controlled by microprocessor and shows received feedback signal.
2. centrifugal pump cavitation monitoring device according to claim 1, is characterized in that, in the microprocessor routine is preset with
The threshold signal of cavitation, also includes in pipeline：
Timing unit, for recording time when each cavitation monitoring unit senses cavity and being connected by circuit with microprocessor
Connect；
Comparison unit, for comparing the energy size of sound wave digital signal and threshold signal and threshold signal energy being exceeded
Sound wave digital data transmission is to microprocessor.
3. centrifugal pump cavitation monitoring device according to claim 2, is characterized in that, also include：
Sensitivity adjusting unit, for adjusting the threshold signal size and passing through connection with microprocessor.
4. centrifugal pump cavitation monitoring device according to claim 1, is characterized in that：Also include monitoring pipeline, each ultrasound
Wave transducer is arranged successively along monitoring pipe lengths, and the transmitting terminal and receiving terminal of ultrasonic transducer are accordingly installed on
The week side of boss of monitoring pipeline.
5. centrifugal pump cavitation monitoring device according to claim 1, is characterized in that：The power of the transmitting terminal is 5w.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621141883.9U CN206159060U (en) | 2016-10-20 | 2016-10-20 | Centrifugal pump cavitation monitoring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621141883.9U CN206159060U (en) | 2016-10-20 | 2016-10-20 | Centrifugal pump cavitation monitoring devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206159060U true CN206159060U (en) | 2017-05-10 |
Family
ID=58655251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621141883.9U Withdrawn - After Issue CN206159060U (en) | 2016-10-20 | 2016-10-20 | Centrifugal pump cavitation monitoring devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206159060U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401989A (en) * | 2016-10-20 | 2017-02-15 | 浙江理工大学 | Centrifugal pump cavitation monitoring device |
-
2016
- 2016-10-20 CN CN201621141883.9U patent/CN206159060U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401989A (en) * | 2016-10-20 | 2017-02-15 | 浙江理工大学 | Centrifugal pump cavitation monitoring device |
| CN106401989B (en) * | 2016-10-20 | 2017-11-14 | 浙江理工大学 | A kind of centrifugal pump cavitation monitoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170510 Effective date of abandoning: 20171114 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20170510 Effective date of abandoning: 20171114 |