CN205642490U - Many reference amounts vortex street mass flow meter based on HART agreement - Google Patents
Many reference amounts vortex street mass flow meter based on HART agreement Download PDFInfo
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- CN205642490U CN205642490U CN201620456783.9U CN201620456783U CN205642490U CN 205642490 U CN205642490 U CN 205642490U CN 201620456783 U CN201620456783 U CN 201620456783U CN 205642490 U CN205642490 U CN 205642490U
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Abstract
The utility model discloses a many reference amounts vortex street mass flow meter based on HART agreement, including the vortex street table body, piezoelectric sensor, pressure sensor, temperature sensor and casing, be provided with signal processing unit in the casing, signal processing unit includes the programme -controlled charge amplifier who connects gradually with piezoelectric sensor, programme -controlled high pass filter, two -stage programmable amplifier, programme -controlled low pass filter, programme -controlled narrow ripples wave filter, programme -controlled trigger and main control unit, programme -controlled low pass filter, programme -controlled narrow ripples wave filter, temperature sensor and pressure sensor's output still is connected with the input of main control unit respectively, the output of main control unit is still continuous with the input of programme -controlled charge amplifier, programme -controlled high pass filter, two -stage programmable amplifier, programme -controlled low pass filter, programme -controlled narrow ripples wave filter respectively. This many reference amounts vortex street mass flow meter based on HART agreement simple structure, increased the flow range than, solved " missing pulse " phenomenon that the height velocity of flow stage appears.
Description
Technical field
This utility model relates to flow measurement technology field, specifically provides a kind of many reference amounts mass flowmeter for vortex street based on HART protocol.
Background technology
Vortex-shedding meter is a kind of flow instrument based on Karman vortex street principle design.Resistance element (vortex generator) it is equipped with in instrument, when fluid arrival certain flow rate flows through resistance element, will be alternately present and the vortex (vortex street) of marshalling the most stably producing two row, the frequency of this vortex, in certain reynolds number range, is directly proportional with the flow velocity of fluid.Accordingly, by detection vortex frequency, and known pipeline sectional area, it is possible to draw the flow of fluid.
But, there is the problems such as low, the poor linearity of lower limit measurement capability in existing vortex-shedding meter.
Therefore, how existing vortex-shedding meter is carried out the improvement in structure, to solve the problems referred to above, become people's problem demanding prompt solution.
Utility model content
In consideration of it, the purpose of this utility model is to provide a kind of many reference amounts mass flowmeter for vortex street based on HART protocol, at least to solve the problems such as existing vortex-shedding meter low, the poor linearity of lower limit measurement capability.
The technical scheme that this utility model provides is: a kind of many reference amounts mass flowmeter for vortex street based on HART protocol, including:
Vortex street table body 1, its two ends connect vortex street flange 11, and it is internally provided with eddy generator 12；
Piezoelectric transducer 2, seals grafting with the outer wall of vortex street table body 1, the vortex flowmeter signals of medium in gathering vortex street table body 1；
Pressure transducer, for gathering the pressure signal in vortex street table body 1；
Temperature sensor, is arranged at the inside of vortex street table body 1, for detecting the temperature signal in vortex street table body 1；
nullHousing 3，It is connected with vortex street table body 1，Signal processing unit it is provided with in it，Described signal processing unit includes the programmed charges amplifier 31 being sequentially connected with piezoelectric transducer 2、Program control high pass filter 32、Two-stage programmable amplifier 33、Program control low pass filter 34、Program control narrow wave filter 35、Program control trigger 36 and main control unit 37，Wherein，The outfan of described program control low pass filter 34 and the outfan of program control narrow wave filter 35 input with main control unit 37 the most respectively is connected，The outfan of described main control unit 37 the most respectively with programmed charges amplifier 31、Program control high pass filter 32、Two-stage programmable amplifier 33、Program control low pass filter 34、The input of program control narrow wave filter 35 is connected，The input of described main control unit 37 is also connected with the outfan of temperature sensor and the outfan of pressure transducer.
Preferably, described many reference amounts mass flowmeter for vortex street based on HART protocol also includes the human-computer interaction interface being connected with main control unit 37, is used for adjusting measurement parameter and display measurement result.
Further preferably, described many reference amounts mass flowmeter for vortex street based on HART protocol also includes the remote control terminal being connected with main control unit 37.
The many reference amounts mass flowmeter for vortex street based on HART protocol that this utility model provides, the medium in vortex street table body is made to produce whirlpool by eddy generator, the vortex flowmeter signals of piezoelectric transducer collection medium, pressure transducer and temperature sensor are for gathering the pressure signal in vortex street table body and temperature signal, vortex flowmeter signals, pressure and temperature information are processed by signal processing unit, can calculate the mass flow of medium.
The many reference amounts mass flowmeter for vortex street based on HART protocol that this utility model provides, simple in construction, increase flow range ratio, improve the linearity of instrument coefficient k, solve " missing pulse " phenomenon that height flow phase occurs, circuit level is high, performance is high, low in energy consumption.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings and this utility model is described in further detail by embodiment:
Fig. 1 is many reference amounts mass flowmeter for vortex street structural representation based on HART protocol；
Fig. 2 is the structural representation of signal processing unit.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is further explained, but does not limit to this utility model.
nullAs shown in Figure 1，This utility model provides a kind of many reference amounts mass flowmeter for vortex street based on HART protocol，Including: vortex street table body 1、Piezoelectric transducer 2、Pressure transducer (not shown)、Temperature sensor (not shown) and the housing 3 being connected with vortex street table body 1，Wherein，The two ends of vortex street table body 1 connect vortex street flange 11、It is internally provided with eddy generator 12，Piezoelectric transducer 2 seals grafting with the outer wall of vortex street table body 1，The vortex flowmeter signals of medium in gathering vortex street table body 1，Pressure transducer is for gathering the pressure signal in vortex street table body 1，Temperature sensor is arranged at the inside of vortex street table body 1，Temperature signal in gathering vortex street table body 1，It is provided with signal processing unit in housing 3，As shown in Figure 2，Described signal processing unit includes the programmed charges amplifier 31 being sequentially connected with piezoelectric transducer 2、Program control high pass filter 32、Two-stage programmable amplifier 33、Program control low pass filter 34、Program control narrow wave filter 35、Program control trigger 36 and main control unit 37，Wherein，The outfan of described program control low pass filter 34 and the outfan of program control narrow wave filter 35 input with main control unit 37 the most respectively is connected，The outfan of described main control unit 37 the most respectively with programmed charges amplifier 31、Program control high pass filter 32、Two-stage programmable amplifier 33、Program control low pass filter 34、The input of program control narrow wave filter 35 is connected，The input of described main control unit 37 is also connected with the outfan of temperature sensor and the outfan of pressure transducer.
It is somebody's turn to do many reference amounts mass flowmeter for vortex street based on HART protocol, the medium in vortex street table body is made to produce whirlpool by eddy generator, the vortex flowmeter signals of piezoelectric transducer collection medium, pressure transducer and temperature sensor are for gathering the pressure signal in vortex street table body and temperature signal, vortex flowmeter signals, pressure and temperature information are processed by signal processing unit, can calculate the mass flow of medium.
This effusion meter, by using special HART communication insulating power supply scheme, improves Meter Reliability and adaptability.
Wherein, the processing procedure of the vortex flowmeter signals that piezoelectric transducer is collected by described signal processing unit is as follows: the vortex flowmeter signals that piezoelectric transducer collects initially enters programmed charges amplifier and carries out pre-amplification, subsequently enter by program control high pass filter, two-stage programmable amplifier, the filter and amplification link of program control low pass filter composition, program control high pass filter and program control low pass filter can effectively filter out the interference signal beyond on-the-spot flow signal frequency range, the wide variation of two-stage programmable amplifier self adaptation scene flow signal amplitude, increase flow range ratio, it is allowed to be maintained in certain amplitude range, ensure the reliability that subsequent digital signal processes.
The output of program control low pass filter is divided into two-way, one tunnel enters main control unit, it is converted into digital signal by ADC, one tunnel enters follow-up program control narrow band filter, program control trigger, wherein, digital signal after ADC conversion is on the one hand for the self-adaptative adjustment of flow signal amplitude, on the one hand Fourier transform is carried out, one time amplitude-frequency recognizer extracts real flow signal frequency, this frequency is used for arranging initial centre frequencies and the bandwidth of program control narrow band filter according to the rule of the algorithm of tracking filter, when program control narrow band filter enters tracking mode, the signal frequency that will export according to self, automatic central adjusting frequency and bandwidth, real-time, stability is higher, eliminate the dependence to main control unit real time high-speed data-handling capacity, advantageously reduce Overall Power Consumption.nullSignal one tunnel of program control narrow band filter output enters another passage of ADC in main control unit and is converted into digital signal，For obtaining the amplitude of now signal，Another road enters program control trigger (specially programmable threshold self adaptation Schmidt trigger) and is converted to pulse signal，Enter main control unit afterwards and obtain the frequency of now signal，And then carry out second time amplitude-frequency recognizer，The signal of program control narrow band filter output is purer，Amplitude measurement is more accurate，Program control trigger ensures that flow signal is converted to pulse signal the most reliably and carries out accurate frequency measurement in main control unit，Second time amplitude-frequency identification is made to have higher accuracy、Stability and reliability，By using double amplitude-frequency recognizers、Tracking filter algorithm coordinates wired program control narrow band filter，Improve circuit anti-interference、Anti-vibration、Real time signal processing and low flow velocity measurement capability，Further expand flow range ratio，Introduce signal threshold value adaptive technique，The raising to on-the-spot pulsating flow process performance is realized by threshold adaptive algorithm and wired program control trigger，And solve " missing pulse " phenomenon that height flow phase occurs.
Flow signal is compensated by pressure signal and temperature signal that main control unit collects always according to pressure transducer and temperature sensor, obtains the flow signal accurately under real-time working condition.
As the improvement of technical scheme, it is somebody's turn to do the human-computer interaction interface that many reference amounts mass flowmeter for vortex street based on HART protocol also includes being connected with main control unit 37, is used for adjusting measurement parameter and display measurement result.
As the improvement of technical scheme, it is somebody's turn to do the remote control terminal that many reference amounts mass flowmeter for vortex street based on HART protocol also includes being connected with main control unit 37, for realizing the remote control to this effusion meter.
Detailed description of the invention of the present utility model is to carry out writing according to the mode gone forward one by one, and highlights the difference of each embodiment, and its similar portion can be with cross-reference.
Above in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but this utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible on the premise of without departing from this utility model objective, various changes can be made.
Claims (3)
1. a many reference amounts mass flowmeter for vortex street based on HART protocol, it is characterised in that including:
Vortex street table body (1), its two ends connect vortex street flange (11), and it is internally provided with eddy generator (12)；
Piezoelectric transducer (2), seals grafting with the outer wall of vortex street table body (1), is used for gathering the vortex flowmeter signals of vortex street table body (1) interior medium；
Pressure transducer, is used for gathering the pressure signal in vortex street table body (1)；
Temperature sensor, is arranged at the inside of vortex street table body (1)；
nullHousing (3)，It is connected with vortex street table body (1)，Signal processing unit it is provided with in it，Described signal processing unit includes the programmed charges amplifier (31) being sequentially connected with piezoelectric transducer (2)、Program control high pass filter (32)、Two-stage programmable amplifier (33)、Program control low pass filter (34)、Program control narrow wave filter (35)、Program control trigger (36) and main control unit (37)，Wherein，The outfan of described program control low pass filter (34) and the outfan of program control narrow wave filter (35) input with main control unit (37) the most respectively is connected，The outfan of described main control unit (37) the most respectively with programmed charges amplifier (31)、Program control high pass filter (32)、Two-stage programmable amplifier (33)、Program control low pass filter (34)、The input of program control narrow wave filter (35) is connected，The input of described main control unit (37) is also connected with the outfan of temperature sensor and the outfan of pressure transducer.
2. according to the many reference amounts mass flowmeter for vortex street based on HART protocol described in claim 1, it is characterised in that: also include the human-computer interaction interface being connected with main control unit (37), be used for adjusting measurement parameter and display measurement result.
3. according to the many reference amounts mass flowmeter for vortex street based on HART protocol described in any one of claim 1 or 2, it is characterised in that: also include the remote control terminal being connected with main control unit (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620456783.9U CN205642490U (en) | 2016-05-19 | 2016-05-19 | Many reference amounts vortex street mass flow meter based on HART agreement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620456783.9U CN205642490U (en) | 2016-05-19 | 2016-05-19 | Many reference amounts vortex street mass flow meter based on HART agreement |
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| CN205642490U true CN205642490U (en) | 2016-10-12 |
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| CN201620456783.9U Active CN205642490U (en) | 2016-05-19 | 2016-05-19 | Many reference amounts vortex street mass flow meter based on HART agreement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525551A (en) * | 2017-09-26 | 2017-12-29 | 威海坤科流量仪表股份有限公司 | Vortex-shedding meter |
| CN113029258A (en) * | 2021-02-05 | 2021-06-25 | 辽宁聚焦科技有限公司 | Vortex street flow meter digital signal processing system based on vortex street amplitude-frequency characteristic anti-interference |
-
2016
- 2016-05-19 CN CN201620456783.9U patent/CN205642490U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525551A (en) * | 2017-09-26 | 2017-12-29 | 威海坤科流量仪表股份有限公司 | Vortex-shedding meter |
| CN113029258A (en) * | 2021-02-05 | 2021-06-25 | 辽宁聚焦科技有限公司 | Vortex street flow meter digital signal processing system based on vortex street amplitude-frequency characteristic anti-interference |
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