CN117782245A - Dual-frequency driving device of mass flowmeter - Google Patents
Dual-frequency driving device of mass flowmeter Download PDFInfo
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- CN117782245A CN117782245A CN202311829259.2A CN202311829259A CN117782245A CN 117782245 A CN117782245 A CN 117782245A CN 202311829259 A CN202311829259 A CN 202311829259A CN 117782245 A CN117782245 A CN 117782245A
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- 230000009977 dual effect Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a dual-frequency driving device of a mass flowmeter, which belongs to the technical field of mass flowmeters, and particularly relates to a dual-frequency driving device of a mass flowmeter, which comprises a flow measuring tube, wherein two groups of dual-frequency driving devices C/D are arranged on the flow measuring tube, the two groups of dual-frequency driving devices C/D are correspondingly connected with two groups of same-frequency and same-power driving circuits A/B, the flow section with the flow limiting capacity above 10% enables the same-frequency and same-power driving circuit A to drive the dual-frequency driving device C to work, and the two groups of same-frequency and same-power driving circuits A/B simultaneously drive the two groups of dual-frequency driving devices C/D to work in the low flow section with the flow limiting capacity below 10%, so that the vibration of the flow measuring tube is enhanced, the stability and the reliability of the signal accuracy of a small flow section can be enhanced and improved.
Description
Technical Field
The invention relates to the technical field of mass flow meters, in particular to a dual-frequency driving device of a mass flow meter.
Background
Currently, mass flowmeters have become one of the most accurate flow meters in flow measurement, and the accuracy of a typical flow meter is: liquid (water or oil) was measured as grade 0.5 and grade 1.0, and gas was measured as grade 1.0 and grade 1.5. While mass flow meters can measure liquids to 0.1 and 0.2 levels, and gases to 0.2 and 0.3 levels. The whole measuring circulation pipeline has no movable or rotary parts, can work reliably for a long time, has low requirements on measured media, and has low requirements on front and rear straight pipe sections of the measuring pipeline. In the design and assembly of the mass flowmeter, the most important work is to make the flow measuring tube have large amplitude (output large measurable signals) as much as possible under the condition of the same measured flow, and to make the influence of the vibration amplitude of the flow measuring tube on the shell and other parts (the professional term is called as external transmission) as much as possible reduced or eliminated, and at the same time, to ensure the reliability of the fatigue resistance of the brazing between the flow measuring tube and the in-out flow diversion elbow.
The structure of the mass flowmeter mainly comprises four parts, namely a supporting tube (with a flange, a split fluid and a supporting tube); secondly, a flow measuring tube (comprising a flow measuring tube, a driving device, a detecting device and a damping plate); thirdly, a shell is closed; fourthly, a meter (a power supply part, an electronic driving part, a signal receiving and shaping processing algorithm output part and a display part).
Because of the working principle of the mass flowmeter, the exciting frequency and power of simple harmonic motion are generated and output through the meter head (electronic driving part) of the mass flowmeter, and the flow measuring tubes are given to the flow measuring tubes, so that under the Golgi force principle, two flow measuring tubes which are arranged side by side generate opposite vibration and opposite displacement, speed, acceleration and angle torsion, and then the flow can be detected through detecting the variation (any one) and the meter head shaping treatment.
The current problems are: to obtain a stronger signal (i.e., a larger variation), the size and shape of the elongated flow measurement tube is increased to increase the vibration. In this way, the vibration of the flow measuring tube can cause the vibration of surrounding air, so that the vibration energy is transferred to the closed shell, and then rebounds to the flow measuring tube, and is further overlapped into the normal vibration movement of the flow measuring tube, namely, the external transmission is increased, so that the deviation of the normal vibration movement occurs, and the measurement accuracy of the mass flowmeter is affected; in addition, the weight and various sizes of the mass flowmeter are also increased, the installation is inconvenient, and the cost is increased.
Therefore, the invention discloses a dual-frequency driving device of a mass flowmeter.
Disclosure of Invention
The present invention has been made in view of the above-mentioned and/or problems occurring in the prior art dual frequency driving apparatus of a mass flowmeter.
It is therefore an object of the present invention to provide a dual frequency drive device for a mass flowmeter that solves the above-mentioned problems.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:
the dual-frequency driving device of the mass flowmeter comprises a flow measuring tube, wherein two groups of dual-frequency driving devices C/D are arranged on the flow measuring tube, and the two groups of dual-frequency driving devices C/D are correspondingly connected with two groups of same-frequency and same-power driving circuits A/B;
wherein, specifically:
in the flow section with the upper current limit of more than 10%, the same-frequency and same-power driving circuit A drives the double-frequency driving device C to work;
in the low flow section below 10% of the upper flow limit, the two groups of same-frequency and same-power driving circuits A/B drive the two groups of double-frequency driving devices C/D to work at the same time, so that the vibration of the flow measuring tube is enhanced, and the stability and reliability of the signal accuracy of the low flow section can be enhanced and improved.
As a preferable mode of the dual-frequency driving device of the mass flowmeter, the invention comprises the following steps: further comprises:
and the flow judging module is used for judging whether the flow reaches the upper limit flow of 10 percent or not, and is arranged on one side of the flow measuring tube.
As a preferable mode of the dual-frequency driving device of the mass flowmeter, the invention comprises the following steps: further comprises:
the driving instruction module is used for controlling the two groups of same-frequency and same-power driving circuits according to the data of the flow judging module, the flow judging module is connected with the driving instruction module, and the driving instruction module is connected with the two groups of same-frequency and same-power driving circuits.
Compared with the prior art:
in the performance of the mass flowmeter, the linear error and the repeatability error of the accuracy are stable in the middle and large flow sections, and the linear error and the repeatability error data of the small flow section determine the accuracy error of the whole flowmeter. In the invention, as the double groups of same-frequency driving devices are adopted, the vibration amplitude of the flow tube is doubled under the condition of unchanged frequency, and the detection signal is doubled, which is equivalent to the conversion of the signal of the small flow section into the signal of the medium flow section, the stability and the reliability of the signal of the small flow section are greatly improved, and the accuracy and the measurement stability of the mass flowmeter are improved; because the medium-large flow section still adopts a single group of driving and working, the original vibration state of the large flow section is not changed, and other adverse factors caused by overlarge vibration can not be generated.
If the original performance parameters are unchanged, the original lower flow limit can be broken through to 1/2 of the original flow limit, that is, the original flow range can be doubled.
From the two points, the double-group same-frequency driving device ensures and does not influence the detection of signals of the medium-large flow section, simultaneously well improves the detection signal performance of the small flow section, improves the stability and reliability of the signal accuracy of the small flow section, and expands the measurement range of the medium-flow meter, thereby ensuring and improving the reliability, the effectiveness and the safety of the normal work and the high accuracy of the mass flowmeter. The purpose of the invention is achieved.
Drawings
FIG. 1 is a schematic flow chart of the structure of the present invention.
In the figure: the flow measuring tube 10, the double-frequency driving device 20, the same-frequency same-power driving circuit 30, the flow judging module 40 and the driving instruction module 50.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The invention provides a dual-frequency driving device of a mass flowmeter, please refer to fig. 1, which comprises a flow measuring tube 10, wherein two groups of dual-frequency driving devices 20C/D are arranged on the flow measuring tube 10, and the two groups of dual-frequency driving devices 20C/D are correspondingly connected with two groups of same-frequency same-power driving circuits 30A/B;
in the flow section with the upper limit flow of more than 10%, the same-frequency and same-power driving circuit 30A drives the double-frequency driving device 20C to work;
in the low flow section below the upper limit flow of 10%, the two groups of same-frequency same-power driving circuits 30A/B drive the two groups of double-frequency driving devices 20C/D to work simultaneously, so that the vibration of the flow measuring tube 10 is enhanced, and the stability and reliability of the signal accuracy of the low flow section can be enhanced and improved.
In the invention, the small flow section (lower limit flow-10% upper limit flow) is driven by double groups of same frequency and same power, and the simple harmonic motion is one time of the original single frequency motion, so that the flow signal detected by the detection device is one time of the original signal, thereby improving the resolution and reliability of the small flow signal; if the original performance parameters are unchanged, the original lower flow limit can be broken through to 1/2 of the original flow limit, that is, the original flow range can be doubled.
Wherein: the flow measurement tube 10, the dual frequency drive device 20 and the same frequency and same power drive circuit 30 are components that have been used in prior art mass flowmeters.
Further comprises: the flow rate determining module 40 determines whether the flow rate reaches the upper limit flow rate of 10%, and the flow rate determining module 40 is disposed on one side of the flow measuring tube 10, wherein the flow rate determining module 40 is preferably a fluid flow sensor, including but not limited to the fluid flow sensors in CN2563554Y and CN 2039410U.
Further comprises: the driving instruction module 50 is configured to control the two sets of same-frequency and same-power driving circuits 30 according to the data of the flow determination module 40, the flow determination module 40 is connected with the driving instruction module 50, and the driving instruction module 50 is connected with the two sets of same-frequency and same-power driving circuits 30, wherein the driving instruction module 50 is preferably a controller.
In addition, the invention can be used to ensure the reliability and effectiveness of high accuracy of the mass flowmeter under operating conditions, and solves the problem that the reflected vibration wave energy of the sealed housing (generated when the flow measuring tube vibrates during operation) returns to the flow measuring tube, and also solves the influence of external or pipeline vibration on the measurement and accuracy of the mass flowmeter. I.e. absorption and elimination of so-called out-feed, ensures the reliability and effectiveness of the proper operation and high accuracy of the mass flowmeter. Furthermore, the inner wall of the closed shell used in the invention can be coated with a vibration absorbing layer according to requirements, wherein the vibration absorbing layer adopts high polymer polyurethane elastomer (or other high polymers with vibration absorbing function), and is sprayed on the inner wall of the closed shell in a spraying mode, and the thickness of the vibration absorbing layer is controlled to be 3-5mm.
Although the invention has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (3)
1. The dual-frequency driving device of the mass flowmeter comprises a flow measuring tube (10), and is characterized in that two groups of dual-frequency driving devices (20) C/D are arranged on the flow measuring tube (10), and the two groups of dual-frequency driving devices (20) C/D are correspondingly connected with two groups of same-frequency same-power driving circuits (30) A/B;
wherein, specifically:
in the flow section with the upper current limit of more than 10%, the same-frequency and same-power driving circuit (30) A drives the double-frequency driving device (20) C to work;
in the low flow section below 10% of the upper flow limit, the two groups of the same-frequency same-power driving circuits (30) A/B drive the two groups of the double-frequency driving devices (20) C/D to work at the same time, so that the vibration of the flow measuring tube (10) is enhanced, and the stability and reliability of the signal accuracy of the low flow section can be enhanced and improved.
2. The dual frequency drive apparatus of a mass flow meter of claim 1, further comprising:
and the flow judging module (40) is used for judging whether the flow reaches the upper limit flow of 10 percent, and the flow judging module (40) is arranged on one side of the flow measuring tube (10).
3. The dual frequency drive apparatus of a mass flow meter of claim 2, further comprising:
the driving instruction module (50) is used for controlling two groups of same-frequency and same-power driving circuits (30) according to the data of the flow judging module (40), the flow judging module (40) is connected with the driving instruction module (50), and the driving instruction module (50) is connected with the two groups of same-frequency and same-power driving circuits (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311829259.2A CN117782245A (en) | 2023-12-27 | 2023-12-27 | Dual-frequency driving device of mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311829259.2A CN117782245A (en) | 2023-12-27 | 2023-12-27 | Dual-frequency driving device of mass flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117782245A true CN117782245A (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311829259.2A Pending CN117782245A (en) | 2023-12-27 | 2023-12-27 | Dual-frequency driving device of mass flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117782245A (en) |
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2023
- 2023-12-27 CN CN202311829259.2A patent/CN117782245A/en active Pending
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