CN208805237U - A kind of double vortex street sensor fluid measurement instruments of shock type - Google Patents
A kind of double vortex street sensor fluid measurement instruments of shock type Download PDFInfo
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- CN208805237U CN208805237U CN201821711184.2U CN201821711184U CN208805237U CN 208805237 U CN208805237 U CN 208805237U CN 201821711184 U CN201821711184 U CN 201821711184U CN 208805237 U CN208805237 U CN 208805237U
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Abstract
The utility model discloses a kind of double vortex street sensor fluid measurement instruments of shock type, including pipeline, it is characterized in that: one end upper inside of the pipeline is fixed with swirl generating body, the upside setting of the pipeline is fluted, support plate is fixed in the groove, the upside setting of the pipeline is fixed with master reference one and master reference two in the support plate, the master reference one and master reference two are separately positioned in two circular holes there are two circular hole.The utility model relates to field of flow meters, in particular, being related to a kind of antivibration vortex street sensor fluid measurement instrument and measurement method.The utility model has the advantages that the interference of vibration signal can be excluded completely, more accurate measurement fluid flow.
Description
Technical field
The utility model relates to field of flow meters, in particular, being related to a kind of double vortex street sensor fluid measurements of shock type
Device.
Background technique
Vortex-shedding meter is a kind of instrument for measuring fluid flow.The industrial flow used both at home and abroad at present is in respect of throttle type
Flowmeter, insert type turbine flowmeter, electromagnetic flowmeter, pitot tube and vortex-shedding meter.The measurement model of restriction flowmeter
Enclose narrow, the pressure loss is big, and energy consumption is high；The cost of major diameter throttling set is high, difficult to install, winter need to add heat-preserving anti-freezing measure.
Though insert type turbine flowmeter stated accuracy is higher, harshness is required to dielectric clean degree, and require often calibration, it is reliable for operation
Property is not high.Electromagnetic flowmeter is only applicable to the measurement of conductive fluid medium, and Large Diameter Pipeline product involves great expense, it is difficult to promote.It surveys
Though speed pipe low cost and energy conservation, range ratio is small, and freeze phenomenon, is unsuitable for working for a long time in sewage and dusty gas.Beauty
The first generation vortex-shedding meter that Eeastech company, state and Japanese Yokogawa Motor company release respectively, has had range ratio at present
Wide, outstanding advantages of crushing is small, precision is high, repdocutbility is good, simple structure, reliable for operation, gas-liquid is general, thermal adaptability is good.
E-H company, West Germany, Kent company, Britain, Foxboro company, the U.S., Fischer&Por-ter company etc. show unique characteristics
Product.But known according to public reporting, these companies mostly only have product of the caliber less than 200 millimeters at present, it is impossible to be used in big
Flow measurement.With the progress of science and technology, already has and temperature and pressure compensation and various collection flow signals, temperature may be implemented
With pressure signal in the flowmeter of one, but current vortex-shedding meter vibration resistance is generally poor, especially more in small flow
It is not to be available, and the factory's operating condition for installing vortex-shedding meter has seriously affected whirlpool with the presence of different degrees of vibration interference
The popularization and application of street flowmeter.Vortex signal can be accurately measured by lacking one kind at present, exclude the vortex street stream of vibration signal interference
Meter, this is in place of the deficiencies in the prior art.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of double vortex street sensor fluid measurement instruments of shock type, keep away
Exempt from influence of the vibration signal to sensor of pipeline, improves the precision of vortex-shedding meter measurement.
The utility model adopts the following technical solution realizes purpose of utility model:
A kind of double vortex street sensor fluid measurement instruments of shock type, including pipeline (4), it is characterized in that: the pipeline (4)
One end upper inside is fixed with swirl generating body (5), is fixed with support plate (1) on the pipeline (4), on the support plate (1)
It is fixed with the master reference one (3) and master reference two (2) reversely concatenated, the master reference one (3) and master reference two (2)
Between spacing be S=(1/2+a) λ；A is 0,1,2,3,4 ..., λ be that swirl generating body (5) cutting liquid body forms vortex signal
Wavelength.
It is further limited as to the technical program, a is preferably 0.
It is further limited as to the technical program, fluted (6) are arranged in the upside of the pipeline (4), the groove
(6) fixed in the support plate (1), the setting of the upside of the pipeline (4) there are two circular hole (7), the master reference one (3) and
Master reference two (2) is each passed through two circular holes (7), and the diameter of circular hole (7) is greater than master reference one (3) and master reference
Two (2) diameters.
It is further limited as to the technical program, liquid of swirl generating body (5) setting in the pipeline (4)
Pipeline (4) one end is divided into symmetrical two parts by entrance one end middle position, the swirl generating body (5).
It is further limited as to the technical program, master reference one (3) negative terminal connects the master reference two
(2) anode of negative terminal, the master reference one (3) and the master reference two (2) connects signal processing apparatus, the signal
Processing unit connects controller, passes through institute after the output signal superposition of the master reference one (3) and the master reference two (2)
It states signal processing apparatus and is conveyed to controller, the controller uses microprocessor.
It is further limited as to the technical program, the signal processing apparatus includes and the master reference one (3)
The charge amplifier connected with the anode of the master reference two (2), the charge amplifier connects low-pass filter, described low
Bandpass filter connects high-pass filter, and the high-pass filter connects variable gain amplifier, and the variable gain amplifier connects
The pin 2 and pin 3 of controller are connect, the variable gain amplifier also connects controllable frequency-selective amplifier, the controllable choosing simultaneously
Audio amplifier connects main amplifier, and the main amplifier connects limiting amplifier, and the limiting amplifier connects schmidt trigger
Device, the pin 85 of the Schmidt trigger connection controller, the controller pin 67 are also connected with frequency isolation output module,
The controller pin 78 is also connected with low pass+V/I converter, and the controller pin 75 is also connected with Interface for digital communication, described
Controller pin 1 connects power supply by isolation module with pin 99, and it is defeated that the pin 83,84 and 87 of the controller is also connected with keyboard
Enter module, 12-35, pin 52-55, the pin 55-59 of the controller are also connected with display module, the pin 95 of the controller
Controllable frequency-selective amplifier is connected with pin 97, the output of the main amplifier is also connected with the pin 96 of the controller.
Compared with prior art, the advantages and positive effects of the utility model are as follows: the utility model is by one He of master reference
The installation spaced apart of master reference two, the liquid passes through conduit of conveying, swirl generating body cut liquid, form vortex, main
After sensor one and master reference two detect vortex signal, due to two differential concatenation of master reference one and master reference, the two
The vortex signal detected is transferred to processor after charge amplifier amplifies after merging, when master reference one and master reference
Two by vibration signal perpendicular to pipeline when, because of master reference one and two height of master reference is identical and reversed concatenation, because
The vibration signal that this master reference one and master reference two detect is cancelled out each other, master reference one and the vibration letter of master reference two
Signal without friction output after number superposition is offset, controller vortex signal after sensor one and master reference two are superimposed based on the received
Transient liquid flow and cumulative flow are calculated, and calculated result is not influenced by the vibration signal of vertical pipe, calculating
Accuracy is higher.
Detailed description of the invention
Fig. 1 is the schematic perspective view one of the utility model.
Fig. 2 is the sectional perspective structural schematic diagram one of the utility model.
Fig. 3 is the sectional perspective structural schematic diagram two of the utility model.
Fig. 4 is the master reference two of the utility model and the vortex signal demonstration schematic diagram that master reference one measures.
Fig. 5 is the master reference 1 of the utility model and the plan view of master reference 22.
Fig. 6 is the principles of the present invention block diagram.
Fig. 7 is the structural schematic diagram of the swirl generating body of the utility model.
Fig. 8 is that the pipe diameter of the utility model and the head-on width of swirl generating body mark schematic diagram.
In figure: 1, support plate, 2, master reference two, 3, master reference one, 4, pipeline, 5, swirl generating body, 6, groove, 7,
Circular hole.
Specific embodiment
With reference to the accompanying drawing, a specific embodiment of the utility model is described in detail, it is to be understood that this
The protection scope of utility model is not limited by the specific implementation.
As Figure 1-Figure 8, the utility model includes pipeline 4, and one end upper inside of the pipeline 4 is fixed with vortex hair
Raw body 5 is fixed with support plate 1 on the pipeline 4, the master reference 1 reversely concatenated and main biography is fixed in the support plate 1
Sensor 22, the spacing between the master reference 1 and master reference 22 are S=(1/2+a) λ；A is 0,1,2,3,4 ...,
λ is the vortex signal wavelength that 5 cutting liquid body of swirl generating body forms vortex.
A is preferably 0, and the master reference 1 and master reference 22 are all made of piezoceramic transducer, two sensors
Structure and height it is all the same.
The upside of the pipeline 4 is arranged fluted 6, fixes the support plate 1, the upside of the pipeline 4 in the groove 6
There are two circular holes 7 for setting, and the master reference 1 and master reference 22 are each passed through two circular holes 7.
Liquid inlet one end middle position of the pipeline 4, the swirl generating body is arranged in the swirl generating body 5
4 one end of pipeline is divided into symmetrical two parts by 5.
One 3 negative terminal of master reference connects the negative terminal of the master reference 22, the master reference 1 and the master
The anode of sensor 22 connects signal processing apparatus, and the signal processing apparatus connects controller, one 3 He of master reference
Controller is conveyed to by the signal processing apparatus after the output signal superposition of the master reference 22, the controller is adopted
With microprocessor, preferably single-chip microcontroller MSP430F449IPZ.
The signal processing apparatus includes the electricity connecting with the anode of the master reference 1 and the master reference 22
Lotus amplifier, the charge amplifier connect low-pass filter, and the low-pass filter connects high-pass filter, the high pass filter
Wave device connects variable gain amplifier, the pin 2 and pin 3 of the variable gain amplifier connection controller, the variable increasing
Beneficial amplifier also connects controllable frequency-selective amplifier simultaneously, and the controllable frequency-selective amplifier connects main amplifier, the main amplifier
Limiting amplifier is connected, the limiting amplifier connects Schmidt trigger, and the Schmidt trigger connection controller draws
Foot 85, the controller pin 67 are also connected with frequency isolation output module, and the controller pin 78 is also connected with low pass+V/I and turns
Parallel operation, the controller pin 75 are also connected with Interface for digital communication, the controller pin 1 and pin 99 and are connected by isolation module
Power supply is connect, the pin 83,84 and 87 of the controller is also connected with keyboard input module, 12-35, the pin 52- of the controller
55, pin 55-59 is also connected with display module, and the pin 95 and pin 97 of the controller connect controllable frequency-selective amplifier, described
The output of main amplifier is also connected with the pin 96 of the controller.Signal processing apparatus is to master reference 1 and master reference 22
After superimposed vortex signal is amplified, is filtered, sent out using after a series of enhanced processings by Schmidt trigger
Give controller.
The charge amplifier of the signal processing apparatus is to master reference 1 and the superimposed electricity of master reference 22
Lotus signal amplifies, and converts it into voltage signal；The low-pass filter, which plays, allows the low frequency component of signal to pass through,
The effect for not allowing the high fdrequency component of signal to pass through；Described play allows the high fdrequency component of signal to pass through, and does not allow the low of signal
The effect that frequency component passes through, the highest frequency of low-pass filter are greater than the low-limit frequency of high-pass filter, their difference is exactly to believe
Number bandwidth；The variable gain amplifier is a kind of variable amplifier of amplification factor, according to the variation of signal, controller with
When adjust amplifier magnification ratio, stable output signal can be played the role of；The controllable frequency-selective amplifier is in different flow feelings
Under condition, controller controls controllable frequency-selective amplifier frequency-selecting effect, plays the role of further filtering superposed signal；The master is put
Big device is to contribute maximum amplifier, its times magnification to the amplification factor of 22 superposed signal of master reference 1 and master reference
Number is maximum；The limiting amplifier is that a kind of a certain range of amplifier is limited in the maximum output swing of superposed signal；
The Schmidt trigger is the trigger that the analog signal of input is converted to square-wave signal；The frequency isolation output module
The device that output frequency signal and internal controller and amplifier are played to electric isolution effect, guarantees external interference signal,
Upset the normal work less than internal controller and amplifier；Low pass+V/I the converter is a low-pass filter+V/I
The combination of switching device, wherein V/I switching device is the device that voltage signal is converted to current output signal.
A kind of antivibration vortex street sensor fluid measurement method, it is characterized in that: including the following steps:
Step 1: the master reference 1 and master reference 22 are spaced (1/2+a) λ installation, a 0,1,2,3,
4 ..., λ are the wavelength that 5 cutting liquid body of swirl generating body forms vortex, and master reference 1 is fixed close to the swirl generating body 5
Position.
Step 2: the liquid of conveying flows through the pipeline 4, and the swirl generating body 5 cuts liquid, forms vortex；
Step 3: after master reference one (3) and master reference two (2) detect vortex signal, master reference one (3) and main
Sensor two (2) differential concatenation is conveyed to controller by signal processing apparatus after the signal merging superposition that the two detects, main
Frequency, the amplitude for two vortex signals that sensor one (3) and master reference two (2) detect are all the same, but phase difference etc.
In half period, because of master reference one (3) and master reference two (2) differential concatenation, master reference one (3) and main sensing
The output amplitude signal of device two (2) is folded, 2 times of amplitude equal to single master reference amplitude；
Step 4: when pipeline (4) vibration where master reference one (3) and master reference two (2), generated signal
Frequency, amplitude on master reference one (3) and master reference two (2) is all the same, because of reversed concatenation, so master reference one
(3) it cancels out each other with the vibration signal of master reference two (2) output, master reference one (3) and master reference two (2) vibration signal
Signal without friction output after superposition is offset, controller vortex street after sensor one (3) and master reference two (2) are superimposed based on the received
Signal calculates transient liquid flow and cumulative flow, and calculated result is not influenced by pipeline (4) vibration signal, therefore is one
The double vortex street sensors of kind shock type, the accuracy of calculating are higher.
The calculating process of the λ of the step 1 is as follows:
The value of λ is calculated according to the functional relation between m, D, d, f and Sr first, the specific steps are as follows:
The ratio between m-- swirl generating body two sides bow-shaped area and conduit cross-sectional area；
D-- pipeline table body latus rectum；
D-- swirl generating body heads on width；
The frequency that vortex occurs are as follows:
The occurrence frequency of f-- vortex；
U1-- swirl generating body two sides mean flow rate；
Average speed, that is, fluid velocity of U-- measured medium incoming flow；
Sr-- Strouhal number, Strouhal number are that have the separation of vortex caused by the object of characteristic size d
The dimensionless group that frequency f is associated with fluid flow rate, it is given by Sr=f*m*d/U；
F=kQ
The instrument coefficient of k-- vortex-shedding meter
Q-- pipeline inner volume flow
The period of T-- whirlpool；
The wavelength of λ -- whirlpool
When Strouhal number Sr is in Reynolds number=2 × 104~7 × 106In range, Sr can be considered constant, therefore to specific whirlpool
Street flowmeter, pipeline table body latus rectum D and swirl generating body head on after width d determination, and the wavelength X of fluid is steady state value.
Disclosed above is only a specific embodiment of the utility model, and still, the utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into the protection scope of the utility model.
Claims (6)
1. a kind of double vortex street sensor fluid measurement instruments of shock type, including pipeline (4), it is characterized in that: the one of the pipeline (4)
End upper inside is fixed with swirl generating body (5), is fixed with support plate (1) on the pipeline (4), solid on the support plate (1)
Surely have a master reference one (3) and master reference two (2) reversely concatenated, the master reference one (3) and master reference two (2) it
Between spacing be S=(1/2+a) λ；A is 0,1,2,3,4 ..., λ be that swirl generating body (5) cutting liquid body forms vortex signal
Wavelength.
2. the double vortex street sensor fluid measurement instruments of shock type according to claim 1, it is characterized in that: a is preferably 0.
3. the double vortex street sensor fluid measurement instruments of shock type according to claim 1, it is characterized in that: the pipeline (4)
Upside fluted (6) are set, fix the support plate (1) in the groove (6), be provided with two on the upside of the pipeline (4)
A circular hole (7), the master reference one (3) and master reference two (2) are each passed through two circular holes (7), circular hole (7) it is straight
Diameter is greater than master reference one (3) and master reference two (2) diameter.
4. the double vortex street sensor fluid measurement instruments of shock type according to claim 1, it is characterized in that: the vortex occurs
Body (5) setting is in liquid inlet one end middle position of the pipeline (4), and the swirl generating body (5) is by pipeline (4) one end
It is divided into symmetrical two parts.
5. the double vortex street sensor fluid measurement instruments of shock type according to claim 1, it is characterized in that: the master reference
One (3) negative terminal connects the negative terminal of the master reference two (2), and the master reference one (3) and the master reference two (2) are just
End connects signal processing apparatus, and the signal processing apparatus connects controller, the master reference one (3) and the master reference
Controller is conveyed to by the signal processing apparatus after the output signal superposition of two (2), the controller uses microprocessor.
6. the double vortex street sensor fluid measurement instruments of shock type according to claim 5, it is characterized in that: the signal processing
Device includes the charge amplifier connecting with the anode of the master reference one (3) and the master reference two (2), the charge
Amplifier connects low-pass filter, and the low-pass filter connects high-pass filter, and the high-pass filter connects variable gain
Amplifier, the pin 2 and pin 3 of the variable gain amplifier connection controller, the variable gain amplifier also connect simultaneously
Controllable frequency-selective amplifier is connect, the controllable frequency-selective amplifier connects main amplifier, and the main amplifier connects limiting amplifier, institute
Limiting amplifier connection Schmidt trigger, the pin 85 of the Schmidt trigger connection controller are stated, the controller draws
Foot 67 is also connected with frequency isolation output module, and the controller pin 78 is also connected with low pass+V/I converter, and the controller draws
Foot 75 is also connected with Interface for digital communication, and the controller pin 1 connects power supply, the controller by isolation module with pin 99
Pin 83,84 and 87 be also connected with keyboard input module, 12-35, pin 52-55, the pin 55-59 of the controller are also connected with
Display module, the pin 95 and pin 97 of the controller connect controllable frequency-selective amplifier, and the output of the main amplifier also connects
Connect the pin 96 of the controller.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282862A (en) * | 2018-10-22 | 2019-01-29 | 山东科尔自动化仪表股份有限公司 | A kind of double vortex street sensor fluid measurement instruments of shock type and measurement method |
| CN110987092A (en) * | 2019-12-27 | 2020-04-10 | 东北石油大学 | Multiphase flow vortex shedding flowmeter in pit |
-
2018
- 2018-10-22 CN CN201821711184.2U patent/CN208805237U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282862A (en) * | 2018-10-22 | 2019-01-29 | 山东科尔自动化仪表股份有限公司 | A kind of double vortex street sensor fluid measurement instruments of shock type and measurement method |
| WO2020082857A1 (en) * | 2018-10-22 | 2020-04-30 | 山东科尔自动化仪表股份有限公司 | Anti-vibration fluid measuring device having two vortex sensors, and measuring method |
| CN109282862B (en) * | 2018-10-22 | 2024-01-09 | 山东科尔自动化仪表股份有限公司 | Vibration-resistant type double vortex street sensor fluid measuring device and measuring method |
| CN110987092A (en) * | 2019-12-27 | 2020-04-10 | 东北石油大学 | Multiphase flow vortex shedding flowmeter in pit |
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