CN102183278B - Method for stabilizing zero point of coriolis mass flowmeter based on auxiliary electromagnet - Google Patents
Method for stabilizing zero point of coriolis mass flowmeter based on auxiliary electromagnet Download PDFInfo
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Abstract
The invention discloses a method for stabilizing the zero point of a coriolis mass flowmeter based on an auxiliary electromagnet, which is jointly realized by a driving feedback ring, a left feedback ring and a right feedback ring, wherein the driving feedback ring eliminates zero point drift caused by common mode change of vibration damping at the left side and the right side of a vibration pipe, and the left feedback ring and the right feedback ring jointly eliminate zero point drift caused by differential mode change of vibration damping at the left side and the right side of the vibration pipe. According to the method, the damping of the vibration pipe is detected and adjusted in real time according to the vibration performance of the vibration pipe per se to ensure stable zero point of the coriolis mass flowmeter, thereby creating favorable conditions for application of the coriolis mass flowmeter in complicated industrial fields; the vibration pipe is made of a simple material and does not need complicated metal treatment technology, so that the production cost of the coriolis mass flowmeters is effectively reduced to benefit for the popularization and use of the coriolis mass flowmeters; and all control circuits are realized by simple simulation circuits without involvement of complicated control algorithms. The method can be used on any bent tube type and straight tube type coriolis mass flowmeters.
Description
Technical field
The present invention relates to the zero point stability method in the coriolis mass flowmeters, particularly relate to a kind of coriolis mass flowmeters zero point stability method based on subsidiary magnet.
Background technology
Coriolis mass flowmeters (hereinafter to be referred as Coriolis flowmeter), when being the vibrating tube of utilizing fluid to flow through to vibrate, the coriolis force of generation, and utilize sensor to the torsion angle that produces because of coriolis force measure the quality of fluid.This flowmeter can be measured higher gas of general liquid, density etc.Coriolis flowmeter by vibrating tube (generally being symmetry shape) and the drive magnetic (being installed in the vibrating tube symmetric points) that is installed on it, detect electromagnet (two are detected electromagnet and are installed in the vibrating tube left and right sides with the drive magnetic by central point), thermometer and the secondary instrument that connects is mutually with it constituted.Wherein vibrating tube has bend pipe, straight tube, single tube, two-tube branch, is the parts of Coriolis flowmeter most critical, and the stable performance whether its stable performance is directly connected to Coriolis flowmeter whether.
It is fashionable that Coriolis flowmeter is applied to the measurement field of temperature variation; Fashionable like variation of ambient temperature or measured medium temperature variation field; Drift about through regular meeting the zero point of Coriolis flowmeter, makes the measuring accuracy of flowmeter reduce, especially when low discharge is measured; Zero point drift makes the flowmeter error sharply increase, when serious even make Coriolis flowmeter normally to measure.Zero point drift mainly is because the unbalanced variation of the vibration damping of the vibrating tube left and right sides causes, is embodied on the output signal that detects electromagnet, shows as the unbalanced variation of amplitude of the sinusoidal signal of left and right sides speed pickup output.The reason of zero point drift comprises following 2 points: the 1) common mode variations of left and right sides rate signal amplitude (common mode variations by vibrating tube left and right sides vibration damping causes); 2) differential mode of left and right sides rate signal amplitude changes (the differential mode variation by vibrating tube left and right sides vibration damping causes).
For the solution of zero point drift, generally all be to adopt the rapidoprint of temperature-resistant metal material, or adopt complicated craft of metal dealing to make vibrating tube insensitive, at present to obtain stable performance at zero point to temperature variation as vibrating tube.The weak point that this scheme exists is to cause the production cost of Coriolis flowmeter very high, and then causes selling price very high, has seriously restricted promoting the use of of Coriolis flowmeter.Therefore, how to use the simple material simple process to obtain stable performance at zero point, become the bottleneck problem of Coriolis flowmeter industry development.
Patent US20050251351A1 adopts the traditional drive magnetic that is installed on the vibrating tube symmetric points of cancellation; And about detect the electromagnet place two drive magnetics be installed respectively; Encourage two drive magnetics respectively and guarantee that two detect the identical scheme of vibration amplitude at electromagnet place through secondary instrument; Overcome 2 reasons that cause zero point drift, obtain stable performance at zero point with this.
This scheme exists some shortcomings:
Two drive magnetics encourage respectively, need the relatively independent exciting circuit of two covers, cause the secondary instrument circuit complicated, and cause Coriolis flowmeter complete machine consumed power excessive; Two drive magnetics encourage respectively, need calculate the power amplification factor of each road drive magnetic respectively, cause the secondary instrument control loop complicated, and cost are higher.
Summary of the invention
The object of the present invention is to provide a kind of coriolis mass flowmeters zero point stability method based on subsidiary magnet, realized jointly by drive feedback ring, left feedback loop and right feedback loop, available lower cost obtains stable performance at zero point.
For achieving the above object, the technical scheme that the present invention adopts is following:
Zero point stability method of the present invention is to be realized jointly by drive feedback ring, left feedback loop and right feedback loop; Wherein, The drive feedback ring is eliminated the zero point drift that vibrating tube left and right sides vibration damping common mode variations causes; Left side feedback loop is eliminated vibrating tube left side vibration damping differential mode and is changed the zero point drift that causes, right feedback loop is eliminated vibrating tube right side vibration damping differential mode and changed the zero point drift that causes.
Described drive feedback ring is eliminated the zero point drift method that vibrating tube left and right sides vibration damping common mode variations causes; Be by drive magnetic that is installed in the vibrating tube symmetric points and auxiliary detection electromagnet; And the Drive and Control Circuit that comprises intermediate magnitude testing circuit, intermediate magnitude initialization circuit, middle amplification initialization circuit and middle driving circuit that is built in the secondary instrument realizes; Detect from the sinusoidal current amplitude of auxiliary detection electromagnet output through the intermediate magnitude testing circuit; And make comparisons with the setting amplitude that is pre-existing in the intermediate magnitude initialization circuit, the difference that relatively draws is amplified initialization circuit as control variable through the centre; Be input to the sinusoidal current amplification factor of drive magnetic in order to driving circuit in the middle of adjusting, thereby keep the vibrating tube amplitude constant at drive magnetic place.
Described left feedback loop is eliminated vibrating tube left side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet and left redundant drive magnetic by a left side that is installed in the vibrating tube left side; And the left control circuit that comprises left amplitude detection circuit, left amplitude initialization circuit, left side amplification initialization circuit and left redundant driving circuit that is built in the secondary instrument is realized; Detect the sinusoidal current amplitude that detects electromagnet output from a left side through left amplitude detection circuit; And make comparisons with the setting amplitude that is pre-existing in left amplitude initialization circuit, the difference that relatively draws is amplified initialization circuit as control variable through a left side; Control left redundant driving circuit is input to the DC current of left redundant drive magnetic; Control the static force of left redundant drive magnetic output with this, thereby detect the distance of electromagnet place vibrating tube between two-tube and change the vibration damping that electromagnet place vibrating tube is detected on a left side, keep the vibrating tube amplitude stability that the electromagnet place is detected on a left side through changing a left side.
Described right feedback loop is eliminated vibrating tube right side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet and right redundant drive magnetic by the right side that is installed in the vibrating tube right side; And the right control circuit that comprises right amplitude detection circuit, right amplitude initialization circuit, right amplification initialization circuit and right redundant driving circuit that is built in the secondary instrument is realized; Detect the sinusoidal current amplitude that detects electromagnet output from the right side through right amplitude detection circuit; And make comparisons with the setting amplitude that is pre-existing in right amplitude initialization circuit, the difference that relatively draws is amplified initialization circuit as control variable through the right side; Control right redundant driving circuit is input to the DC current of right redundant drive magnetic; Control the static force of right redundant drive magnetic output with this, thereby change the right vibration damping that detects electromagnet place vibrating tube, keep the right vibrating tube amplitude stability that detects the electromagnet place through changing the right distance of electromagnet place vibrating tube between two-tube that detect.
The beneficial effect that the present invention has is:
(1) according to the vibration performance of vibrating tube self, detect in real time and adjust the vibrating tube damping, guarantee the zero point stability of Coriolis flowmeter, thereby created advantage in the on-the-spot application of complex industrial for Coriolis flowmeter.
(2) adopt simple made vibrating tube, and do not need complicated craft of metal dealing, effectively reduce the production cost of Coriolis flowmeter, help promoting the use of of Coriolis flowmeter.
(3) all control loops do not relate to complicated control algolithm by simple Realization of Analog Circuit, and reliability is high.
The present invention can use in bend pipe at any symmetric shape, straight tube, single tube, the Coriolis flowmeter such as two-tube.
Description of drawings
Fig. 1 rough schematic view that to be the present invention assemble with vibrating tube and secondary instrument mutually.
Fig. 2 is the fundamental diagram of drive feedback ring among the present invention.
Fig. 3 is the fundamental diagram of right-of-center in political views's feedback loop of the present invention.
Fig. 4 is the fundamental diagram of left feedback loop among the present invention.
Among the figure: 1, vibrating tube, 2, secondary instrument, 3, drive magnetic, 4, the auxiliary detection electromagnet; 5, Drive and Control Circuit, 5A, intermediate magnitude testing circuit, 5B, intermediate magnitude initialization circuit, 5C, the middle initialization circuit that amplifies; Driving circuit in the middle of the 5D,, 6, a left side detects electromagnet, 7, the left redundant drive magnetic, 8, left control circuit; 8A, left amplitude detection circuit, 8B, left amplitude initialization circuit, initialization circuit, 8D, left redundant driving circuit are amplified in 8C, a left side; 9, the right electromagnet that detects, 10, that right redundant drives electromagnetism is special, 11, right control circuit, 11A, right amplitude detection circuit; 11B, right amplitude initialization circuit, 11C, right initialization circuit, 11D, the right redundant driving circuit of amplifying.
Embodiment
Specify embodiment of the present invention below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, zero point stability method of the present invention is to be realized jointly by drive feedback ring, left feedback loop and right feedback loop, can use in bend pipe at any symmetric shape, straight tube, single tube, the Coriolis flowmeter such as two-tube.Wherein, The drive feedback ring is eliminated the zero point drift that vibrating tube 1 left and right sides vibration damping common mode variations causes; Left side feedback loop is eliminated vibrating tube 1 left side vibration damping differential mode and is changed the zero point drift that causes, right feedback loop is eliminated vibrating tube 1 right side vibration damping differential mode and changed the zero point drift that causes.
As shown in Figure 2; Described drive feedback ring is eliminated the zero point drift method that vibrating tube 1 left and right sides vibration damping common mode variations causes; Be by drive magnetic that is installed in vibrating tube 1 symmetric points 3 and auxiliary detection electromagnet 4; And the Drive and Control Circuit 5 that comprises intermediate magnitude testing circuit 5A, intermediate magnitude initialization circuit 5B, the middle initialization circuit 5C of amplification and middle driving circuit 5D that is built in the secondary instrument 2 realizes; Detect from the sinusoidal current amplitude of auxiliary detection electromagnet 4 outputs through intermediate magnitude testing circuit 5A; And make comparisons with the setting amplitude that is pre-existing in intermediate magnitude initialization circuit 5B, the difference that relatively draws is amplified initialization circuit 5C as control variable through the centre; Be input to the sinusoidal current amplification factor of drive magnetic 3 in order to driving circuit 5D in the middle of adjusting, thereby keep the vibrating tube amplitude constant at drive magnetic place.
As shown in Figure 2, schematically shown the principle of work that drive magnetic 3, auxiliary detection electromagnet 4, Drive and Control Circuit 5 cooperatively interact and influence with elimination vibrating tube 1 left and right sides vibration damping common mode variations in the drive feedback ring of the present invention.Auxiliary detection electromagnet 4 detects the vibration of vibrating tube 1, and output and the proportional sinusoidal signal of vibrating tube 1 vibration velocity.The sinusoidal signal that auxiliary detection electromagnet 4 is exported is carried out voltage and power amplification (enlargement factor is amplified initialization circuit 5C by the centre and confirmed) through middle driving circuit 5D on the one hand, is input to and produces 1 vibration of sinusoidal force driving vibrating tube in the drive magnetic 3.Auxiliary detection electromagnet 4, middle driving circuit 5D, drive magnetic 3, vibrating tube 1 common closed loop, self-excitation, the resonator system formed guarantee that vibrating tube 1 is in its natural frequency place vibration.
As shown in Figure 2; The sinusoidal signal of auxiliary detection electromagnet 4 outputs is on the other hand through intermediate magnitude testing circuit 5A; Detect the amplitude of this sinusoidal signal, and with the amplitude that intermediate magnitude initialization circuit 5B sets, in middle subtracter, subtract each other; Subtract each other resulting difference and be input to the middle initialization circuit 5C that amplifies, voltage and the power amplification multiple of driving circuit 5D in the middle of calculating as control variable.When vibrating tube 1 receives temperature effect; When vibration damping became big (diminishing), the sinusoidal signal amplitude of auxiliary detection electromagnet 4 outputs diminished (becoming big), with the strain big (diminishing) mutually of the difference of setting amplitude; Causing middle driving circuit 5D enlargement factor to become simultaneously greatly with the sinusoidal current that is input to drive magnetic 3 (diminishes); Like this, vibrating tube 1 just can maintain constant amplitude vibration, has eliminated because the vibration damping that temperature variation causes changes the Coriolis flowmeter influence at zero point.
Like Fig. 3, shown in Figure 4; Schematically show the right feedback loop right-of-center in political views of the present invention and detected the work that cooperatively interacts of electromagnet 9, right redundant drive magnetic 10, right control circuit 11; And the work that cooperatively interacts of electromagnet 6, left redundant drive magnetic 7, left control circuit 8 is detected on a left side in the left feedback loop, eliminates the principle of work that the differential mode of vibrating tube 1 left and right sides vibration damping changes jointly.
As shown in Figure 3; Described right feedback loop is eliminated vibrating tube 1 right side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet 9 and right redundant drive magnetic 10 by the right side that is installed in vibrating tube 1 right side; And the right control circuit 11 that comprises right amplitude detection circuit 11A, right amplitude initialization circuit 11B, the right initialization circuit 11C of amplification and right redundant driving circuit 11D that is built in the secondary instrument 2 is realized; Detect the sinusoidal current amplitude that detects electromagnet 9 outputs from the right side through right amplitude detection circuit 11A; And make comparisons with the setting amplitude that is pre-existing in right amplitude initialization circuit 11B, the difference that relatively draws is amplified initialization circuit 11C as control variable through the right side; Control right redundant driving circuit 11D is input to the DC current of right redundant drive magnetic 10; Control the static force of right redundant drive magnetic 10 output with this, thereby change the right vibration damping that detects electromagnet 9 place's vibrating tube 1, keep the right vibrating tube amplitude stability that detects the electromagnet place through changing the right distance of electromagnet 9 place's vibrating tube 1 between two-tube that detect.
As shown in Figure 3, be that the right feedback loop right-of-center in political views of the present invention detects electromagnet 9, right redundant drive magnetic 10, right control circuit 11 and cooperatively interacts to eliminate the fundamental diagram of vibrating tube 1 right vibration damping variable effect.The right vibration that detects electromagnet 9 detection vibrating tube 1 right side, and output and the directly proportional sinusoidal signal of vibrating tube 1 right side vibration velocity.The right sinusoidal signal that detects electromagnet 9 outputs is imported secondary instrument 2 on the one hand to detect flow; On the other hand through right amplitude detection circuit 11A; Detect the amplitude of this sinusoidal signal, and with the amplitude that right amplitude initialization circuit 11B sets, in right subtracter, subtract each other; Subtract each other resulting difference and be input to the right initialization circuit 11C that amplifies, calculate the output current of right redundant driving circuit 11D as control variable.Right redundant driving circuit 11D exports DC current, and the right redundant of flowing through drive magnetic 10 produces a static action power, changes the distance between two pipes of vibrating tube 1 right side, changes the vibration performance on vibrating tube 1 right side, especially vibration damping with this.
As shown in Figure 3, when vibrating tube 1 right side receives temperature effect, when vibration damping changes; The right sinusoidal signal amplitude that detects electromagnet 9 outputs changes; With the corresponding change of difference of setting amplitude, cause the right output voltage that amplifies initialization circuit 11C to change, the DC current of the right redundant of flowing through drive magnetic 10 changes; The static action power that produces changes, and the distance between two pipes of vibrating tube 1 right side changes.This process is adjustment in real time always, the state before vibration damping becomes temperature influence again once more, thus eliminated because the vibrating tube 1 right side vibration damping that temperature variation causes changes the Coriolis flowmeter influence at zero point.
As shown in Figure 4; Described left feedback loop is eliminated vibrating tube 1 left side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet 6 and left redundant drive magnetic 7 by a left side that is installed in vibrating tube 1 left side; And the left control circuit 8 that comprises left amplitude detection circuit 8A, left amplitude initialization circuit 8B, left side amplification initialization circuit 8C and left redundant driving circuit 8D that is built in the secondary instrument 2 is realized; Detect the sinusoidal current amplitude that detects electromagnet 6 outputs from a left side through left amplitude detection circuit 8A; And make comparisons with the setting amplitude that is pre-existing in left amplitude initialization circuit 8B, the difference that relatively draws is amplified initialization circuit 8C as control variable through a left side; Control left redundant driving circuit 8D is input to the DC current of left redundant drive magnetic 7; Control the static force of left redundant drive magnetic 7 output with this, thereby detect the distance of electromagnet 6 place's vibrating tube 1 between two-tube and change the vibration damping that electromagnet 6 place's vibrating tube 1 are detected on a left side, keep the vibrating tube amplitude stability that the electromagnet place is detected on a left side through changing a left side.
As shown in Figure 4, be that left side detection electromagnet 6, left redundant drive magnetic 7, left control circuit 8 cooperatively interact to eliminate the fundamental diagram of vibrating tube 1 left vibration damping variable effect in the feedback loop of the present invention left side.The vibration that electromagnet 6 detects vibrating tube 1 left side is detected on a left side, and output and the directly proportional sinusoidal signal of vibrating tube 1 left side vibration velocity.A left side is detected the sinusoidal signal of electromagnet 6 outputs and is imported secondary instrument 2 on the one hand to detect flow; On the other hand through left amplitude detection circuit 8A; Detect the amplitude of this sinusoidal signal, and with the amplitude that left amplitude initialization circuit 8B sets, in left subtracter, subtract each other; Difference is input to a left side and amplifies initialization circuit 8C, the output current of decision left redundant driving circuit 8D.Left redundant driving circuit 8D exports DC current, and the left redundant of flowing through drive magnetic 7 produces a static action power, changes the distance between two pipes of vibrating tube 1 left side, changes the vibration performance in vibrating tube 1 left side, especially vibration damping with this.
Shown in Figure 4, when vibrating tube 1 left side receives temperature effect, when vibration damping changes; The sinusoidal signal amplitude that electromagnet 6 outputs are detected on a left side changes; With the corresponding change of difference of setting amplitude, the output voltage that causes a left side to amplify initialization circuit 8C changes, and the DC current of the left redundant of flowing through drive magnetic 7 changes; The static action power that produces changes, and the distance between two pipes of vibrating tube 1 left side changes.This process is adjustment in real time always, the state before vibration damping becomes temperature influence again once more, thus eliminated because the vibrating tube 1 left side vibration damping that temperature variation causes changes the Coriolis flowmeter influence at zero point.
Claims (1)
1. coriolis mass flowmeters zero point stability method based on subsidiary magnet; It is characterized in that: the zero point stability method is to be realized jointly by drive feedback ring, left feedback loop and right feedback loop; Wherein, The drive feedback ring is eliminated the zero point drift that vibrating tube (1) left and right sides vibration damping common mode variations causes; Left side feedback loop is eliminated vibrating tube (1) left side vibration damping differential mode and is changed the zero point drift that causes, right feedback loop is eliminated vibrating tube (1) right side vibration damping differential mode and changed the zero point drift that causes; Described drive feedback ring is eliminated the zero point drift method that vibrating tube (1) left and right sides vibration damping common mode variations causes; Be by drive magnetic (3) that is installed in vibrating tube (1) symmetric points and auxiliary detection electromagnet (4); And the Drive and Control Circuit (5) that comprises intermediate magnitude testing circuit (5A), intermediate magnitude initialization circuit (5B), middle amplification initialization circuit (5C) and middle driving circuit (5D) that is built in the secondary instrument (2) realizes; Detect from the sinusoidal current amplitude of auxiliary detection electromagnet (4) output through intermediate magnitude testing circuit (5A); And make comparisons with the setting amplitude that is pre-existing in intermediate magnitude initialization circuit (5B); The difference that relatively draws is as control variable; Amplify initialization circuit (5C) through the centre, be input to the sinusoidal current amplification factor of drive magnetic (3) in order to driving circuit (5D) in the middle of adjusting, thereby keep the vibrating tube amplitude constant at drive magnetic place;
Described left feedback loop is eliminated vibrating tube (1) left side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet (6) and left redundant drive magnetic (7) by a left side that is installed in vibrating tube (1) left side; And the left control circuit (8) that comprises left amplitude detection circuit (8A), left amplitude initialization circuit (8B), left side amplification initialization circuit (8C) and left redundant driving circuit (8D) that is built in the secondary instrument (2) is realized; Detect the sinusoidal current amplitude that detects electromagnet (6) output from a left side through left amplitude detection circuit (8A); And make comparisons with the setting amplitude that is pre-existing in left amplitude initialization circuit (8B); The difference that relatively draws is as control variable; Amplify initialization circuit (8C) through a left side, control left redundant driving circuit (8D) is input to the DC current of left redundant drive magnetic (7), controls the static force of left redundant drive magnetic (7) output with this; Thereby detect electromagnet (6) and locate the distance of vibrating tube (1) between two-tube and change a left side and detect the vibration damping that electromagnet (6) is located vibrating tube (1) through changing a left side, keep the vibrating tube amplitude stability that the electromagnet place is detected on a left side;
Described right feedback loop is eliminated vibrating tube (1) right side vibration damping differential mode and is changed the zero point drift method that causes; Be to detect electromagnet (9) and right redundant drive magnetic (10) by the right side that is installed in vibrating tube (1) right side; And the right control circuit (11) that comprises right amplitude detection circuit (11A), right amplitude initialization circuit (11B), right amplification initialization circuit (11C) and right redundant driving circuit (11D) that is built in the secondary instrument (2) is realized; Detect the sinusoidal current amplitude that detects electromagnet (9) output from the right side through right amplitude detection circuit (11A); And make comparisons with the setting amplitude that is pre-existing in right amplitude initialization circuit (11B); The difference that relatively draws is as control variable; Amplify initialization circuit (11C) through the right side, control right redundant driving circuit (11D) is input to the DC current of right redundant drive magnetic (10), controls the static force of right redundant drive magnetic (10) output with this; Thereby locate the distance of vibrating tube (1) between two-tube and change the right vibration damping that electromagnet (9) is located vibrating tube (1) that detects through changing the right electromagnet (9) that detects, keep the right vibrating tube amplitude stability that detects the electromagnet place.
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Citations (2)
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US6748813B1 (en) * | 1998-12-08 | 2004-06-15 | Emerson Electric Company | Coriolis mass flow controller |
EP1985975A2 (en) * | 2007-04-25 | 2008-10-29 | Krohne AG | Coriolis mass flow measuring device |
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US6748813B1 (en) * | 1998-12-08 | 2004-06-15 | Emerson Electric Company | Coriolis mass flow controller |
EP1985975A2 (en) * | 2007-04-25 | 2008-10-29 | Krohne AG | Coriolis mass flow measuring device |
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