CN101346611B - Vibratory measuring transducer - Google Patents

Vibratory measuring transducer Download PDF

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Publication number
CN101346611B
CN101346611B CN2006800487336A CN200680048733A CN101346611B CN 101346611 B CN101346611 B CN 101346611B CN 2006800487336 A CN2006800487336 A CN 2006800487336A CN 200680048733 A CN200680048733 A CN 200680048733A CN 101346611 B CN101346611 B CN 101346611B
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CN
China
Prior art keywords
measuring tube
antihunter
measurement translator
longitudinal axis
inner part
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Application number
CN2006800487336A
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Chinese (zh)
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CN101346611A (en
Inventor
马丁·安克林-伊姆霍夫
克里斯蒂安·许策
恩尼奥·比托
克里斯托夫·胡伯
迪特尔·蒙得兴
米歇尔·兰布里格
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Endress and Hauser Flowtec AG
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Endress and Hauser Flowtec AG
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Priority claimed from DE200510062007 external-priority patent/DE102005062007A1/en
Application filed by Endress and Hauser Flowtec AG filed Critical Endress and Hauser Flowtec AG
Priority claimed from PCT/EP2006/069076 external-priority patent/WO2007074014A1/en
Publication of CN101346611A publication Critical patent/CN101346611A/en
Application granted granted Critical
Publication of CN101346611B publication Critical patent/CN101346611B/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention relates to a measuring transducer comprising a housing and an inner part arranged in the housing. The inner part comprises at least one curved measuring tube (10) which vibrates at least intermittently during operation and is used to guide the medium; and a counter-oscillator (20) which is fixed to the measuring tube (10) on the inlet side in such a way as to form a coupling region (11#), and on the outlet side in such a way as to form a coupling region (12#). The inner part is held in a vibrating manner in the converter housing at least by means of two connection tubular pieces (11, 12). The measuring tube (10) is communicated with a tubular line during operation, and is oriented in relation to each other and to an imaginary longitudinal axis (L) of the measuring transducer, such that the inner part can oscillate about the longitudinal axis (L) during operation. Furthermore, the measuring tube (10) and counter-oscillator (20) are embodied and oriented in relation to each other in such a way that both a centre of mass M10 of the measuring tube (10), located at a certain distance from the imaginary longitudinal axis (L), and a centre of mass M20 of the counter-oscillator (20), located at a certain distance from the imaginary longitudinal axis (L), lie in a common region of the measuring transducer which is defined by the imaginary longitudinal axis (L) and the measuring tube (10), and the centre of mass M10 of the measuring tube (10) is located further away from the longitudinal axis (L) than the centre of mass M20 of the counter-oscillator (20).

Description

Transducer of vibration type
Technical field
The present invention relates to a kind of transducer of vibration type, particularly be applicable to the transducer of vibration type of coriolis mass flowmeters.
Background technology
For the medium determining to flow in the pipeline mass rate of liquid or other fluid particularly, often use this measurement instrument, it utilizes transducer of vibration type and connected control and analytical electron device and cause Coriolis force in fluid, and becomes the measuring-signal of representation quality flow from these Lik-Sangs.
This measurement translator, particularly their application in coriolis mass flowmeters, known already and be used for industry.For example DE-A 10 2,004 023 600, US-B 66 66098, US-B 64 77 902, US-A 57 05 754, US-A 55 49 009 or US-A 52 87754 have put down in writing coriolis mass flowmeters, it has transducer of vibration type, and this measurement translator is reacted to the mass rate of the medium that flows in the pipeline and comprised the transducer shell and be arranged on inner part in the transducer shell.Inner part comprises: the measuring tube of at least one bending, and it is intermittent control shaking and be used for boot media at least during operation; And antihunter, it is fixed to measuring tube to form first attachment section and to be fixed to measuring tube to form second attachment section at outlet side at entrance side, and antihunter is static basically during operation, perhaps it and measuring tube anti-phase oscillations equally, that is, frequency is identical and phase place is opposite.In addition, inner part is utilized two connecting tubes can oscillatorily remain in the transducer shell at least, and during operation, measuring tube communicates with pipeline via this connecting tube.
Just as is known, when (for example U-shaped, V-arrangement or Ω shape) vibration survey pipe of bending is actuated to bending vibration according to the first built-in oscillation form, cause Coriolis force in the medium of flowing through therein.In the situation of this measurement translator, usually such built-in oscillation form is elected to be the first built-in oscillation form of measuring tube, in this built-in oscillation form, measuring tube with minimum natural resonance frequency around the swing of the virtual longitudinal axis of measurement translator, as at one end by the cantilever of clamp.The Coriolis force that produces in the medium of flowing through causes by this way, the crooked oscillating phase stack of at least a second built-in oscillation form of the pendulum model oscillating cantilevered beam of the excitation of alleged effective model and same frequency.In the situation of the measurement translator of described type, these oscillating cantilevered beams that forced by Coriolis force are corresponding to alleged coriolis mode, and usually in this built-in oscillation form, measuring tube is also around the virtual Z-axis rotational oscillation perpendicular to the longitudinal axis.Because the stack of effective model and coriolis mode, the phase differential surveyed that utilizes the vibration of measuring tube of the sensor device detection at entrance side and outlet side place to have the mass rate of depending on.
This measuring tube that for example is installed in the measurement translator in the coriolis mass flowmeters often is actuated to the transient resonance frequency of the first built-in oscillation form during operation, particularly has by the amplitude of constant adjusting.Because this resonance frequency particularly also depends on the instantaneous density of fluid,, except mass rate, can also measure the density of mobile fluid so for example utilize commercial coriolis mass flowmeters commonly used.
An advantage of crooked tube shape is, for example, particularly has in the situation of measuring tube of higher thermal expansion coefficient, because the expansion that heat causes causes or only cause very little mechanical stress hardly in measuring tube self and/or in the pipeline that connects in use.Yet another advantage of crooked measuring tube is that measuring tube can be made longlyer relatively, thereby can obtain the high sensitivity of measurement translator for mass rate to be measured with relatively short installation length and relatively low excitation energy.This all makes it possible to by the made measuring tube with high thermal expansion coefficient and/or high resiliency modulus, and these materials for example are stainless steels.By comparison, in the situation of oscillation mode measurement translator with straight measuring tube, measuring tube is made by such material usually, it is compared with stainless steel has lower thermal expansivity at least and also may have lower module of elasticity as required, to prevent axial stress and to obtain enough measuring accuracy.So for this situation, measuring tube is preferably made by titanium or zirconium, yet because higher material price and high processing cost usually, the measuring tube that they are made than stainless steel is more expensive.In addition, just as is known, compare with the measurement translator with two horizontal survey pipes, the measurement translator with single measuring tube also has an advantage to be, no longer needs to be used for the distribution member that measuring tube is linked to each other with pipeline.This distribution member is made complexity on the one hand, also shows as the liquid that is very easy to form deposition or obstruction on the other hand.
Because the bandwidth of the antihunter in the effective model is very narrow usually, thereby for the application of Media density in the relative broad range fluctuation, particularly compare with this measurement translator with two horizontal survey pipes, measurement translator with single bend measuring tube often has following shortcoming: because the unbalancedness of inner part is with density fluctuation, so the measuring accuracy of the zero point of measurement translator and each in-situ measurement equipment can equally significantly fluctuate and can correspondingly reduce.This is the result who utilizes common single antihunter, and transverse force only can be by balance by halves, and thereby only can leave the pipeline of connection by halves.This transverse force is because the alternately transverse movement of the single measuring tube of boot media and inducting in measurement translator, and because the Media density of surging and to compare bandwidth quite big with the opposite force that generates based on antihunter.So the transverse force of remnants can cause the whole longitudinal axis swing around measurement translator of above-mentioned inner part, and is just horizontal with vibration.Correspondingly, these swayings of inner part have also produced the additional elastic deformation of connecting tube, and the vibration of not expecting in the pipeline that can also obtain by this way connecting.In addition, based on this swaying of inner part, can also cause the oscillating cantilevered beam that does not have in the measuring tube that fluid flows through.These and coriolis mode are very approximate, and with coriolis mode have identical frequency and thereby be difficult for and its differentiation, this will make the measuring-signal of representing the actual mass flow can't obtain use.
Also this thing happens in the situation of the measurement translator of for example implementing according to the principle of US-A 57 05 754 or US-A 52 87 754 propositions.In the situation of the measurement translator that these documents are put down in writing, all or part of single measuring tube by vibration generates and the transverse force of quite low or high frequency oscillation is utilized single antihunter as far as possible away from pipeline, this antihunter is compared suitable weight and is tuned to the frequency higher than measuring tube with measuring tube, and if desired, also utilize the soft connection of measuring tube to pipeline, promptly utilize basically mechanical low pass with transverse force away from pipeline.Yet in this case, the quality that obtains the required antihunter of the enough firm decay of transverse force increases the ratio that surpasses with the measuring tube nominal diameter.This measuring tube for this high nominal diameter shows very big shortcoming, because use this high quality components to mean the manufacturing cost of assembly and the cost that measuring equipment is fit into pipeline is all increased.In addition, in this case,, very different with the lower equally natural frequency of the pipeline that connects although can only guarantee that the minimum natural frequency of measurement translator often reduces with the quality increase really with higher complexity.As a result, this measurement translator has been subject to relatively low measuring tube nominal diameter very much since the use in the described type on-line measurement instrument (for example, Coriolis mass flowmeter) that can be industrial is very long, and maximum is about 10mm.The measurement translator of the above-mentioned type is sold with series number " PROMASS A " by the applicant, nominal diameter scope 1～4mm, and the application scenario of verified particularly extremely low at flow velocity and/or high pressure is suitable for.
On the contrary, in the situation of the measurement translator shown in US-B 66 66 098, the US-B 64 77 902 or 55 49 009, substantially two straight connecting tubes are so relative to each other and with respect to the virtual longitudinal axis orientation of measuring tube, and the inner part that makes the vibratory stimulation device that utilizes measuring tube and antihunter and respective application and osciducer form during operation can be around longitudinal axis swing.In other words, based on the imbalance that particularly depends on density between measuring tube 10 and the antihunter 20, whole inner part can be carried out during operation around the hunt of longitudinal axis L, depends on unbalanced mode, the oscillating cantilevered beam homophase of this hunt and measuring tube 10 or antihunter 20.In this case, the torsional rigidity of connecting tube preferably match each other like this and with the inner part coupling of this two connecting tubes supporting, make inner part rotate substantially flexibly and suspend around the longitudinal axis.
For example in the situation of US-B 66 66 098, this realizes by this way, promptly, the size of the torsional rigidity of connecting tube makes the natural frequency at the torsion oscillator of entrance side and outlet side be positioned at the scope with the oscillation frequency of the measuring tube of effective model vibration, and wherein this torsion oscillator utilizes connecting tube and affiliated substantially rigid and dimensionally stable and around the inner part end mass part of longitudinal axis rotational oscillation and intrinsic formation.In addition, in the situation of the measurement translator that proposes in US-B 66 66098, measuring tube and antihunter match each other like this, make them vibrate with approximately equalised resonance frequency with effective model at least at least.In addition, the measurement translator of described type is also sold with series number " PROMASS H " by the applicant, and the nominal diameter scope is 8-50mm and the verified application scenario that is specially adapted to be exposed to a certain extent during operation the variable density medium.By this way, the oscillating motion of inner part is particularly developed or be favourable at least, make with the virtual longitudinal axis apart the measuring tube barycenter and be arranged in a public measurement translator zone of opening with virtual longitudinal axis antihunter barycenter apart by the virtual longitudinal axis and measuring tube.
Yet investigation shows, significantly is offset the situation of the reference density of demarcation at low-down mass velocity and Media density, and the zero point of the measurement translator of mentioned kind, remarkable fluctuation can take place.Used heavier antihunter relatively in the measurement translator according to US-B 66 66 098 structures, experimental investigation for this measurement translator is recognized, by this way, zero stability has suitable raising, and thereby the measuring accuracy of the on-line measurement instrument of the type is improved, but the degree that improves can not be satisfactory.In the structure of US-B 66 66 098 suggestion, the obvious raising of measuring accuracy only can realize under the prerequisite of the shortcoming of accepting to discuss with reference to US-A 57 05 754 or US-A 5,287 754 front.
Summary of the invention
So, an object of the present invention is to improve zero point density dependency and thereby improve the zero stability of the measurement translator of described type, and in fact make on the one hand mobile equilibrium well in the Media density scope of broad of survey sensor, and on the other hand however, compare with the measurement translator of suggestion among US-A 57 05 754 or the US-A 52 87 754, have lower quality.Particularly in this case, can be as to use disclosed compensation principle among the US-B 66 66 098 effectively in the past, effective frequency and antihunter that the intrinsic torsion oscillator of its medial end portions is matched to measuring tube substantially are matched to effective frequency.
In order to realize this target, the invention reside in a kind of transducer of vibration type that is used for the mobile medium of pipeline.This measurement translator comprises the transducer shell and is arranged on the interior inner part of transducer shell.Inner part comprises: the measuring tube of at least one bending, and it vibrates at least off and on during operation and is used for boot media; And antihunter, it is fixed to measuring tube to form first attachment section at entrance side, is fixed to measuring tube to form second attachment section at outlet side.Inner part utilizes two connecting tubes oscillatorily to be supported in the transducer shell at least.Measuring tube communicates with pipeline during operation by this connecting tube, and connecting tube makes that inner part can be during operation around longitudinal axis swing relative to each other and with respect to measurement translator longitudinal axis orientation.Measuring tube and antihunter are implemented like this and are relative to each other directed, make with the virtual longitudinal axis apart the measuring tube barycenter and all be arranged in the public domain of opening by the virtual longitudinal axis and measuring tube of measurement translator with virtual longitudinal axis antihunter barycenter apart.In addition, measuring tube and antihunter constitute like this and are relative to each other directed, make that the barycenter of measuring tube is more farther than the centroid distance longitudinal axis of antihunter.
In the first embodiment of the present invention, the distance of each the above-mentioned barycenter and the virtual longitudinal axis is all greater than 10% of ultimate range between the measuring tube and the virtual longitudinal axis.
In the second embodiment of the present invention, the distance of each the above-mentioned barycenter and the virtual longitudinal axis is all less than 90% of ultimate range between the measuring tube and the virtual longitudinal axis.
In the third embodiment of the present invention, the distance between each the above-mentioned barycenter and the virtual longitudinal axis is all greater than 30mm.
In the fourth embodiment of the present invention, the ratio of the distance of each above-mentioned barycenter and measuring tube diameter is all greater than 1.In the further developing of this embodiment of the present invention, the ratio of the distance of each above-mentioned barycenter and measuring tube diameter is all greater than 2 and less than 10.
In the fifth embodiment of the present invention, the diameter of measuring tube is greater than 1mm and less than 100mm.
In the sixth embodiment of the present invention, the longitudinal axis of measuring tube is with two virtual linking together of attachment section.
In the seventh embodiment of the present invention, the quality of antihunter is greater than the quality of measuring tube.In the further developing of this embodiment of the present invention, the ratio of the quality of antihunter and the quality of measuring tube is greater than 2.
In the eighth embodiment of the present invention, measuring tube is U or V-arrangement substantially.
In the ninth embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form.
In the tenth embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and antihunter utilizes at least two antihunter plates to form, wherein the first antihunter plate is arranged on the measuring tube left side, and the second antihunter plate is arranged on the measuring tube right side.
In the 11st embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and at least two antihunter plates each all has with respect to the far-end outline line of the longitudinal axis and the center of gravity line of the bending of virtual extension between with respect to the near-end outline line of the longitudinal axis.In the further developing of this embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and each the center of gravity line at least two antihunter plates is recessed with respect to the longitudinal axis in the zone of center section at least.In another of this embodiment of the present invention further developed, antihunter was to form by the laterally disposed antihunter plate of measuring tube, and at least two antihunter plates each at least in the scope of attachment section with respect to longitudinal axis projection.Further, the center of gravity line of each of at least two antihunter plates is U or V-arrangement in the zone of the center section of antihunter at least substantially, and/or each center of gravity line of at least two antihunter plates is basically parallel to the center of gravity line of measuring tube, the latter is virtual extension in the measuring tube inner chamber.
In the 12nd embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and each at least two antihunter plates all has exterior lateral sides, its first edge is by providing the edge with respect to the far-end profile of the longitudinal axis to form, and its second edge is by providing the edge with respect to the near-end profile of the longitudinal axis to form.In the further developing of this embodiment of the present invention, each of at least two antihunter plates is implemented like this and is placed in the measurement translator, make that at least the edge that far-end and near-end profile are provided of each of at least two antihunter plates and the distance of the longitudinal axis are non-vanishing in the zone of the center section of antihunter.In this case, in at least two antihunter plates each can be implemented like this, make local plate hight at least in the zone of the center section of antihunter always less than in the zone of two attachment section, wherein local plate hight is corresponding to the minor increment between each the edge that far-end and near-end profile are provided of at least two antihunter plates.Further, implement each at least two antihunter plates like this, make it in the zone of the center section of antihunter, have minimum plate hight, and/or each plate hight of at least two antihunter plates begins to reduce gradually to the center section of antihunter from attachment section, particularly dull or reduce continuously.
In the 13rd embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and each of at least two antihunter plates has arch or arc profile.
In the 14th embodiment of the present invention, antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form, and each of at least two plates that forms antihunter all is basically parallel to measuring tube.
In the 15th embodiment of the present invention, measuring tube and antihunter utilize at least one first unitor and utilize at least one second unitor mechanical connection each other at outlet side at entrance side.
In the 16th embodiment of the present invention, connecting tube comprises straight substantially pipeline section.In the further developing of this embodiment of the present invention, connecting tube is so relative to each other directed, makes pipeline section be basically parallel to the virtual longitudinal axis and extends.In this case, connecting tube can be so relative to each other directed, and feasible straight substantially pipeline section is in alignment with each other substantially and/or aligns with the virtual longitudinal axis.
In the 17th embodiment of the present invention, measuring tube is carried out at least off and on during operation with respect to antihunter and with respect to the bending of the longitudinal axis and is vibrated.
In the 18th embodiment of the present invention, measuring tube and antihunter are carried out the vibration around the longitudinal axis of same frequency during operation at least off and on and at least in part.Further developing according to this embodiment of the invention, this bending vibration around the longitudinal axis are also to small part out-phase each other, and be particularly anti-phase substantially.
In the 19th embodiment of the present invention, the inner part that can oscillatorily be supported in the transducer shell has the nature cross mode, and wherein it is followed the deformation of two connecting tubes during operation and vibrates with respect to the transducer shell and transverse to the longitudinal axis at least off and on.
In the 20th embodiment of the present invention, the inner part that can oscillatorily be supported in the transducer shell has the hunt pattern, and wherein it is followed the deformation of two connecting tubes during operation and swings around the virtual longitudinal axis at least off and on.Further developing according to this embodiment of the invention, at least one natural inherent frequency of hunt pattern is less than the minimum oscillation frequency of measuring tube instantaneous vibration, and/or at least one instantaneous natural inherent frequency of hunt pattern is always less than the instantaneous minimum natural inherent frequency of measuring tube.
In the 21st embodiment of the present invention, the inner part that can oscillatorily be supported in the transducer shell has hunt pattern and natural cross mode, in the hunt pattern, inner part is followed the deformation of two connecting tubes during operation and is swung around the virtual longitudinal axis at least off and on; In natural cross mode, inner part is followed the deformation of two connecting tubes during operation and is vibrated with respect to the transducer shell and transverse to the longitudinal axis at least off and on, and the minimum natural frequency of the cross mode of inner part is greater than the minimum natural frequency of the hunt pattern of inner part.In the further developing of this embodiment of the present invention, the ratio of the minimum natural frequency of the cross mode of inner part and the minimum natural frequency of the hunt pattern of inner part is greater than 1.2, and/or the ratio of minimum natural frequency and the minimum natural frequency of the hunt pattern of inner part of cross mode of inner part is less than 10.Especially, in this case, the minimum natural frequency of the cross mode of above-mentioned inner part can keep greater than 1.5 and less than 5 with the ratio of the minimum natural frequency of the hunt pattern of inner part.
In the 22nd embodiment of the present invention, the inner part that can oscillatorily be supported in the transducer shell has the hunt pattern, and wherein inner part is followed the deformation of two connecting tubes during operation and swung around the virtual longitudinal axis at least off and on; And at least one natural inherent frequency of the hunt pattern of inner part is less than the minimum oscillation frequency of measuring tube instantaneous vibration, and/or at least one instantaneous natural inherent frequency of hunt pattern of inner part is always less than the instantaneous minimum natural inherent frequency of measuring tube.In the further developing of this embodiment of the present invention, the ratio of the minimum natural frequency of measuring tube and the minimum natural frequency of inner part hunt pattern is greater than 3 and/or less than 20.Especially, in this case, the ratio of the minimum natural frequency of measuring tube and the minimum natural frequency of inner part hunt pattern is greater than 5 and less than 10.
In the 23rd embodiment of the present invention, measurement translator also comprises exciting bank, is used to make the vibration of measuring tube and antihunter.
In the 24th embodiment of the present invention, measurement translator also comprises sensor device, is used to detect the vibration of measuring tube at least.In the further developing of this embodiment of the present invention, the sensor device that is used to detect the vibration of measuring tube comprises first sensor that at least one is provided with at the entrance side of measuring tube and second sensor that is provided with at the outlet side of measuring tube.In addition, what have advantage is, the sensor device that is used to detect the vibration of measuring tube comprises that further at least one is arranged on the 3rd sensor of measuring tube entrance side and the four-sensor that is arranged on the measuring tube outlet side.Particularly first sensor and the 3rd sensor are oppositely arranged on measuring tube, and second sensor and four-sensor are oppositely arranged on measuring tube.
Basic thought of the present invention is, and is particularly opposite with disclosed measurement translator among the US-B 66 66 098, moves the barycenter of antihunter than the more close longitudinal axis of the barycenter of measuring tube.By this way, antihunter can be heavier than measuring tube, although also can drive the above-mentioned intrinsic end torsion oscillator that is formed by inner part and connecting tube in the mode of suggestion among the US-B 66 66 098.Also shown in this case,, it is highly important that the mass distribution that substantially realizes measuring tube and antihunter with being equal to for the balancing a survey transducer as what in US-B 66 66 098, discuss, and thereby the substantially distribution of realization centroid position with being equal to.The more important thing is that during operation, those moments that produce owing to the motion of measuring tube of vibration must be as far as possible introduced the end attachment section with the identical effective angle of moment that produces with the antihunter of same vibration.This point particularly with reference to the mode of suggestion among the US-B 66 66 098, is converted to the very not crucial oscillating motion of inner part with possible horizontal imbalance as far as possible fully.Conversely, can also prevent that more effectively this horizontal imbalance is converted to other destructive oscillation form of inner part to a great extent or at least obviously by this way.Displacement by the barycenter aforesaid way, the working range of measurement translator can obviously increase, particularly with US-B 66 66 098 in disclosed comparing, thereby the angular deflection that between two above-mentioned effective angles, causes owing to Media density fluctuation all be bear or all be positive.So being implemented in the situation lower angle skew that equates fluctuation range in the mode with advantage only has less absolute magnitude.As a result, can realize the measurement translator particularly oscillating characteristic of its inner part and the Optimum Matching of duration of work testing medium, particularly about the Media density fluctuation of expectation, so and can realize depending on the obvious improvement of the influence at zero point of density.
Equally, disclosed compensation principle can not only further obtain using among the US-B 66 66 098, and is further improved, and wherein antihunter can not only heavier and particularly have stronger flexural rigidity and torsional rigid.Further, compare, can increase (about 10% magnitude) with less relatively quality and realize that sensitivity surpasses 50% raising with above-mentioned " PROMASS H " type measurement translator, and thereby the corresponding measuring accuracy of having improved.Especially, except improvement depends on the zero point influence of density, even demarcate the situation of reference density, also can under the situation of minimum velocity, detect significantly improving of on-line measurement instrument measurement precision at the substantial deviation measurement translator.
The feature of measurement translator of the present invention also is, the above-mentioned type antihunter that has corresponding better quality by use, two connecting tubes are can corresponding maintenance shorter, and thereby total installation length of measurement translator can significantly reduce, and keeps the decoupling zero of substantially invariable high-quality dynamic oscillation simultaneously.In addition, although the installation length of measurement translator is short, it still can be lighter relatively.
Description of drawings
The embodiment that provides in reference to the accompanying drawings explains the present invention and further advantage thereof below.Provide identical reference marker for identical parts in the accompanying drawing.For the sake of clarity, in the figure of back, save already mentioned Reference numeral.In the accompanying drawing:
Fig. 1 a, b are the different side views that are used for the on-line measurement instrument of the mobile medium of pipeline;
Fig. 2 is the skeleton view that is applicable to according to the cut-away section of the transducer of vibration type of the on-line measurement instrument of Fig. 1 a, 1b; With
Fig. 3 and 4 is different side views of cut-away section of the measurement translator of Fig. 2.
Embodiment
What show among Fig. 1 a, the b is the on-line measurement instrument, for example Coriolis mass flowmeter, density measure instrument, viscosity measurement instrument etc., it (for example can be installed in pipeline, the process line of factory) in, be used for measuring and/or monitoring at least one parameter of the mobile medium of pipeline, for example mass rate, density, viscosity etc.For this reason, on-line measurement instrument involving vibrations type measurement translator, testing medium this measurement translator of flowing through during operation.Fig. 2 and 3 schematically illustrates the corresponding embodiment of this transducer of vibration type.The physical construction of principle and mode of operation are most of similar to US-B 66 66 098 disclosed measurement translators.Measurement translator is used for producing mechanical reactance at the medium of flowing through, for example depend on mass rate Coriolis force, depend on the inertial force of density and/or depend on the friction force of viscosity, these reacting forces can react on measurement translator by the mode of sensor can measure particularly.From these reacting forces, can be with for example mass rate m, density p and/or the viscosities il of manner known in the art measuring media.Measurement translator comprises transducer shell 100 for this reason and is arranged on inner part in the transducer shell 100 that the latter is used to realize physics-electricity conversion of at least one parameter to be measured.
For boot media, inner part comprises bend measuring tube 10, and it here is single, makes measuring tube vibration and repetition elastic deformation during operation, vibrates around static rest position.Measuring tube 10 and measuring tube 10 can for example be W or U-shaped at the center of gravity line that the inner chamber internal virtual extends substantially, perhaps are V-arrangement as shown in Figure 2 substantially.Because measurement translator should be used for multiple different application occasion, particularly commercial measurement and technical field of automation, so further propose, according to the application scenario of measurement translator, the diameter of measuring tube is in the scope of about 1mm to about 100mm.
In order to minimize the disturbing influence that acts on measuring tube 10, and, in measurement translator, also provide antihunter 20 in order to reduce the oscillation energy that is delivered to the pipeline of connection from the measurement translator side.As shown in Figure 2, this antihunter is fixed to measuring tube 10 and is fixed to measuring tube 10 by forming the second attachment section 12# at outlet side at entrance side at a distance of setting and by forming the first attachment section 11# with measuring tube 10 side direction in measurement translator, wherein first attachment section limits the inlet end of measuring tube 10 substantially, and second attachment section limits the output terminal of measuring tube 10 substantially.Antihunter 20 is basically parallel to measuring tube 10 in the embodiment shown and extends, particularly coaxial setting with it, and this antihunter also can for example be tubulose or be box-like substantially.For latter event, as shown in Figure 2, can for example utilize the plate that is provided with on the left side and the right side of measuring tube 10 to form antihunter 20.
As can relatively seeing from Fig. 1, Fig. 2 and 3, antihunter 20 is utilized at least one entrance side first unitor 31 and remains on the inlet end 11# of measuring tube 0, and outlet side second unitor 32 that utilizes at least one particularly to be equal to substantially with unitor 31 remains on the endpiece 12# of measuring tube 10.In this case, for example simple gusset plate can be used as unitor 31,32, and it is fixed to measuring tube 10 and antihunter 20 at entrance side and outlet side in the corresponding way.In addition, in the embodiment situation that here shows, utilize y direction each other apart gusset plate and the box of the complete closure that forms respectively at entrance side and outlet side together of the protrusion end of antihunter 20 or the framework that also has part to open wide can be used as unitor 31 or unitor 32.
In order to allow testing medium to flow through, measuring tube 10 also is connected to the pipeline (not shown) of introducing or drawing medium suitably by first connecting tube 11 and by second connecting tube 12, first connecting tube feeds the zone of the first attachment section 11# at entrance side, second connecting tube particularly is equal to first connecting tube 11 substantially and leads to the zone of the second attachment section 12# at outlet side, and wherein two connecting tubes 11,12 all have straight substantially pipeline section.Having the mode of advantage, measuring tube 10 realizes together with two connecting tubes, 11,12 single types, thereby for example single tubular semifinishedly can be used to make them.The measuring tube 10 that replacement is formed by the fragment of single pipe, inlet pipe fitting 11 and outlet pipe fitting 12, they also can utilize separation, engage semi-manufacture for example welded together subsequently and make.In order to make measuring tube 10, can also use this measurement translator any material commonly used, for example steel, Haast nickel alloy, titanium, zirconium, tantalum etc.
As additional show in Fig. 1, Fig. 2 and 3, particularly compare the higher transducer shell 100 of bending stiffness and torsional rigidity and particularly be fixed to entrance side connecting tube 11 rigidly with respect to the inlet end of the first attachment section #11 far-end and outlet side connecting tube 12 endpiece with respect to the first attachment section #11 far-end with measuring tube 10.So whole inner part is not only sealed by transducer shell 100 fully, and because the spring effect of its deadweight and two connecting tubes 11,12 and can oscillatorily being supported in the transducer shell 100.Except holding inner part, transducer shell 100 also is used to support the electronic device housing 200 of online measurement instrument and the measurement instrument electronic installation that wherein holds.For the measurement translator situation of pipe laying removably, also the entrance side connecting tube 11 at inlet end forms first flange 13, and forms second flange 14 at the outlet side connecting tube 12 of endpiece.Very common as the measurement translator for described type, in this case, flange 13,14 is also at least partially in distolateral integrated with transducer shell 100.If desired, connecting tube 11,12 also can for example utilize welding directly to link to each other with pipeline.
As common in the situation of this transducer of vibration type, at the measurement translator duration of work, measuring tube 10 is energized and carries out with excitation frequency f ExcOscillating cantilevered beam, thereby it with alleged effective model around the longitudinal axis L of measurement translator oscillatorily substantially with the nature first built-in oscillation form bending.So measuring tube 10 is carried out crooked vibration with respect to antihunter 20 and longitudinal axis L during operation at least off and on.Simultaneously, antihunter 20 also is actuated to oscillating cantilevered beam, and particularly vibrates to small part and with measuring tube 10 out-phase of effective model vibration substantially anti-phasely.Especially, in this case, measuring tube 10 is actuated to antihunter 20 and carries out the identical but anti-phase substantially bending vibration around longitudinal axis L of frequency during operation at least off and on and at least in part.In this case, crooked vibration also can have equal model order and thereby have the basic form that equates at least in the situation of stationary fluid.In other words, measuring tube 10 and antihunter 20 move in the mode of tuning fork prong of vibration toward each other.In another embodiment of the present invention, in this case, excitation frequency is the effective model frequency f just ExcBe adjusted to as far as possible accurately particularly minimum natural inherent frequency corresponding to measuring tube 10.Use that nominal diameter by the stainless steel manufacturing is about as 29mm, wall thickness that 1.5mm, spread length are about 420mm, the situation of looking long measuring tube as 305mm measured from inlet end #11 to endpiece 12#, for example when density is zero substantially (for example, measuring tube is full of air fully), the measuring tube lowest resonant frequency is about 490Hz.The minimum natural inherent frequency f of antihunter 20 is further proposed in the mode with advantage 20Approximate the natural inherent frequency f of measuring tube 10And thereby also approximate excitation frequency f Exc
In order to produce the mechanical oscillation of measuring tube 10 and antihunter 20, measurement translator also comprises particularly electronic exciting bank 40.This is used for the electric excitation ENERGY E ExcBe converted into exciting force F ExcThis electric excitation energy is for example provided and is for example had controlled current flow and/or a controlled voltage by the control electronic installation (not shown) in the electronic device housing 200 of being contained in of above-mentioned coriolis mass flowmeters, and this exciting force for example acts on measuring tube 10 and deflection measuring tube 10 in the above described manner with pulse or harmonic wave form.Be applicable to and regulate excitation energy E ExcThe control electronic installation for example comprise the control electronic installation that in US-A 47 77 833, US-A 48 01 897, US-A 48 79 911 or US-A 5,009 109, shows.Commonly used as such measurement translator, exciting force F ExcCan two-way or unidirectional formation and for example utilize Flow Control and/or voltage-controlled circuit to regulate its amplitude and for example utilize phaselocked loop to regulate its frequency with manner known in the art.Exciting bank 40 can be for example single spiral piping arrangement, it comprises the cylinder drive coil that is fixed on the antihunter 20 and is flow through by corresponding exciting current at work and comprises the permanent magnetism armature that inserts drive coil at least off and on that this armature externally particularly is fixed on the measuring tube 10 at mid point.In addition, for example electromagnet also is used as exciting bank 40.
In order to detect the vibration of measuring tube 10, measurement translator also comprises sensor device 50.In fact sensor device 50 can be the normally used any sensor device of this measurement translator, and its motion that detects measuring tube 10 is particularly in the motion of entrance side and outlet side and be converted into respective sensor signals.So sensor device 50 can utilize at entrance side to be arranged on the first sensor 51 on the measuring tube 10 and to utilize second sensor 52 that is arranged on the measuring tube 10 at outlet side to form for example with manner known in the art.Sensor can be the electronic speed pickup of for example relative measurement vibration or also can be electronic path sensor or acceleration transducer.As the substituting or replenishing of electrodynamic transducer device,, can also use resistance or piezoelectric strain gauge or photoelectric sensing apparatus in order to detect the vibration of measuring tube 10.
In addition, if desired, can also be with manner known in the art, provide and measure and/or other required sensor of operational measure transducer, for example additional osciducer (with reference to US-A 57 36 653) is being set on the antihunter 20 and/or on the transducer shell 100 or for example temperature sensor (with reference to US-A 47 68 384 or WO-A 00/102816) can be set on measuring tube 10, antihunter 20 and/or transducer shell 100.
In order further to improve the signal quality of the sensor signal that sends by sensor device and/or in order to obtain extra oscillation information, in of the present invention further developing, except two motions or osciducer 51,52, on measuring tube 10, also be provided with two osciducers 53,54 that the motion of measuring tube is reacted, thereby sensor device 50 is made of at least four this sensors, schematically shows as Fig. 4.In this case, the 3rd sensor 53 is placed on the entrance side of measuring tube 10 equally, and four-sensor 54 is placed on the outlet side of measuring tube 10 equally.According to the embodiment that this further develops of the present invention, further propose, the 3rd sensor 53 is arranged in the zone of first sensor 51, particularly at the opposite side of measuring tube 10; And four-sensor 54 is arranged in the zone of second sensor 52, particularly at the opposite side of measuring tube 10.For situation shown in Figure 4, wherein 51,53 and two outlet side sensors 52,54 of two entrance side sensors are oppositely arranged on the measuring tube 10, promptly, directly opposite one another and on orientation of oscillation, see and be in alignment with each other, by this way, particularly in two sensors that are oppositely arranged respectively 51,53 or 52,53 situations about being connected in series, the remarkable improvement of the signal to noise ratio (S/N ratio) of the oscillation measurement signal that can obtain to transmit by less relatively ancillary cost when implementing sensor device 50.For the structure of simplifying sensor device 50 and by the analysis of the oscillation measurement signal of its transmission, according to another embodiment, further propose, the structure of osciducer that forms sensor device 50 is basic identical.
For medium in pipeline, flow and thereby mass rate m be not equal to zero situation, Zhen Dong measuring tube 10 Coriolis force of in the medium that flows through, also inducting in the above described manner.They act on measuring tube 10 conversely and cause that the additional of measuring tube 10 can be by the deformation of sensor, and this deformation is the nature second built-in oscillation form.In this case, the instantaneous feature, particularly amplitude of the alleged coriolis mode of the effective model of the excitation of this same frequency that superposeed also depend on instantaneous mass flow m.As common in the situation of this measurement translator with bend measuring tube, the second built-in oscillation form can be the built-in oscillation form of for example asymmetric twisted mode, wherein as already mentioned, measuring tube 10 is also carried out the rotational oscillation around virtual Z-axis H, and this virtual Z-axis is perpendicular to longitudinal axis L and the single symmetrical plane of the measurement translator shown in being arranged in.
For very common and thereby the expectation situation, during operation, mass distribution in density of medium that flows in the measuring tube and the inner part that accompanies significantly changes, and the dynamic balance between the antihunter 20 of the measuring tube 10 of vibration and vibration equally in the above described manner is by disturbance.If the transverse force that frequently acts in the inner part together with vibration measuring tube 10 that obtain thus can not be compensated, be suspended in the static installation site that the inner part lateral runout on two connecting tubes 11,12 distributes so.By this way, transverse force can also act on the pipeline of connection at least in part and make pipeline and the on-line measurement instrument is vibrated in the mode of not expecting via connecting tube 11,12, as already mentioned, measuring tube 10 communicates with pipeline by this connecting tube during operation.In addition, this transverse force can also cause, because inner part or the uneven suspension on oscillation technology of whole measurement translator, so for example in fact inevitably manufacturing tolerance causes measuring tube 10 except with the additional oscillating cantilevered beam that for example also is actuated to the interference oscillatory frequently according to the second built-in oscillation form, this is particularly because identical oscillation frequency and no longer can being distinguished from actual coriolis mode by sensor.
Except horizontal interference oscillatory, the inner part that is suspended in the transducer shell can also be carried out around the hunt of longitudinal axis L, and wherein attachment section is around longitudinal axis rotation and connecting tube 11,12 distortions.In the corresponding way, the corresponding rotation of reversing of two attachment section and unitor 31,32 experience around longitudinal axis L, that is, and their vibrations and basic each other homophase.In other words, the inner part that can oscillatorily be supported in the transducer shell has the hunt pattern, and in this pattern, inner part is accompanied by the deformation of two connecting tubes 11,12 during operation and swings around virtual longitudinal axis L at least off and on.In this case, the measuring tube 10 of vibration and antihunter 20 are also carried out the common oscillating motion around longitudinal axis L, their oscillating motion is homophase and with respect to the oscillating cantilevered beam homophase of measuring tube 10 and antihunter 20, as long as the quality m of antihunter 20 substantially each other in the situation of quiescent atmosphere at least 20Instantaneous gross mass less than the measuring tube 10 of boot media.For opposite situation, the gross mass of the measuring tube 10 of boot media is less than the quality of antihunter 20, these oscillating motions of inner part can with the oscillating cantilevered beam homophase of antihunter 20 and measuring tube 10.
Yet on the other hand, the inner part itself that can oscillatorily be suspended in the transducer shell 100 has at least one natural cross mode, its mainly by the elasticity of flexure rigidity of connecting tube 11,12 with and instantaneous gross mass determine.In this cross mode, follow the respective curved deformation of two connecting tubes 11,12, inner part will make its corresponding obtaining impact during operation with respect to transducer shell 100 and around longitudinal axis L transverse resonance.Equally, inner part also has at least one natural hunt pattern, it is mainly determined by the elasticity of torsion rigidity of connecting tube 11,12 and around instantaneous total moment of inertia of longitudinal axis L, wherein it is followed the corresponding twist distortion of two connecting tubes during operation and around virtual longitudinal axis L resonance, makes its corresponding obtaining impact.
Cheeringly be, as what in US-B 66 66 098, discussed, can pass through connecting tube 11,12 and the suitable coupling of inner part, and the remaining transverse force major part that will impact the inner part cross mode is converted to the hunt of whole inner part around longitudinal axis L, and the key of this hunt reduces greatly.For this reason, must regulate a natural inherent frequency f of first torsion oscillator by the size of deciding two connecting tubes 11,12 and unitor 31,32 suitably 1An and natural inherent frequency f of second torsion oscillator 2, make two natural frequency f 1, f 2Approximate the excitation frequency f of measuring tube 10 vibrations greatly ExcWherein first torsion oscillator forms at the unitor 31 that entrance side utilizes connecting tube 11 and limits entrance side attachment section 11# basically, and second torsion oscillator utilizes connecting tube 12 and limits unitor 32 formation of oral-lateral attachment section 11# basically at outlet side equally; About this point, with reference to US-B 66 66 098.As inner part possible with effective frequency f ExcThe result of hunt, two above-mentioned torsion oscillator equal extent ground are around longitudinal axis L torsional oscillation.In order to regulate natural frequency f 1, f 2Match each other suitably around the entrance side mass mement of inertia (utilizing entrance side unitor 31 to provide here substantially) of longitudinal axis L torsional rigidity, and match each other suitably around the outlet side mass mement of inertia (utilizing unitor 32 to provide here substantially) of longitudinal axis L torsional rigidity with outlet side connecting tube 12 with affiliated connecting tube 11.In the situation of measurement translator shown here, except gusset plate and terminal outstanding plate end, when deciding mass mement of inertia, also to consider the pipeline section that between two gusset plates of unitor 31,32, extends reversing the coupling of natural mode for entrance side.
Based on mating effective model and reverse natural mode in the above described manner, realized that inner part accurately is driven into oral-lateral and the outlet side torsion oscillator enters natural mode, wherein inner part during operation with excitation frequency f ExcThe measuring tube 10 of vibration is with swing frequently.For this situation, with natural frequency vibration f separately 1, f 2And two torsion oscillators that in phase vibrate with inner part are with very little or do not have counter torque to resist its torsional oscillation.As a result, inner part rotates supporting flexibly during operation, and it is full decoupled on oscillation technology to make that in fact it can be counted as with two connecting tubes 11,12.Because although inner part is full decoupled substantially also during operation around longitudinal axis L oscillating motion and not rotating, so always do not have the rotary pulsed of inner part.Yet, also have horizontal overall pulse and equal zero equally substantially by the transverse force that it obtains, wherein the former particularly almost directly depends on always rotary pulsedly in measuring tube 10 and the similar situation of antihunter 20 mass distribution, and latter's (transverse force) part internally is delivered to the outside.For the situation of expectation, inner part swing during operation is in each instantaneous natural frequency scope of two torsion oscillators, and measuring tube can together be swung with antihunter, does not have transverse force substantially and around the torsional moment of longitudinal axis L.As a result, in the situation of this balance or decoupling mechanism, the imbalance that depends on density mainly causes the amplitude of the hunt of inner part to change, yet inner part only leaves the insignificant very little transversal displacement in static installation site.As a result, measurement translator can be independent of the density mobile equilibrium of fluid substantially in the working range of relative broad, and thereby the susceptibility of its transverse force of producing for inside can significantly reduce.
Have been found that now in the situation of the measurement translator of described type, particularly in the situation of having implemented above-mentioned decoupling mechanism, importantly inner part not only rotate flexibly with the transducer shell but also with the pipeline mechanical attachment that is connected.In wonderful mode, particularly importantly, during operation, introduce the end attachment section with the identical effective angle of the moment that produces with the antihunter of same vibration because the kinetic moment of the measuring tube of vibration is many as far as possible.Yet, further shown, because the Media density of fluctuation significant angular deflection may occur between the introducing angle.
In order in the accessible border of working range of expectation, to keep this basic inevitably angular deflection of fluctuation as much as possible, in the situation of measurement translator of the present invention, measuring tube 10 and antihunter 20 constitute like this and are directed each other, make to schematically show as Fig. 3, measuring tube 10 with virtual longitudinal axis L barycenter M apart 10And antihunter 20 with virtual longitudinal axis L barycenter M apart 20Be arranged in measurement translator by virtual longitudinal axis L and measuring tube 10 common zones of opening.In addition, measuring tube 10 and antihunter 20 are further realized like this and are relative to each other directed, make at least in rest position the barycenter M of measuring tube 10 10Barycenter M than antihunter 20 20L is farther apart from the longitudinal axis.According to another embodiment of the present invention, two above-mentioned barycenter M are proposed also 10, M 20Separately and the distance of virtual longitudinal axis L greater than 10% of the maximal detectable range between measuring tube 10 and the virtual longitudinal axis L.For realizing measurement translator with common installation measure, this will mean, each barycenter M 10, M 20With the distance of virtual longitudinal axis L all greater than 30mm.In addition, have been found that each barycenter M 10, M 20The diameter ratio of distance and measuring tube 10 should particularly be at least 2 greater than 1.In addition, can find, as each barycenter M 10, M 20And the distance of virtual longitudinal axis L had advantage less than 90% o'clock of ultimate range between measuring tube 10 and the virtual longitudinal axis L.According to another embodiment of the present invention, also suggestion, each barycenter M 10, M 20The diameter ratio of distance and measuring tube 10 keep greater than 2 and less than 10.
By placing barycenter in the above described manner, the working range of measurement translator can significantly increase, particularly compare with disclosing of US-B 66 66 098, thereby because the Media density of fluctuation and the angular deflection that must occur between two above-mentioned effective angles can all be to bear or all for just, and thereby only be about half size, that is, absolute magnitude is less relatively.So the influence at zero point that measurement translator depends on density also can significantly be reduced.
In addition, import the decoupling zero of robust as far as possible in order to realize that measurement translator inner part and measuring tube 10 sides are disturbed, particularly also in order to guarantee that inner part self is as far as possible because the decoupling mechanism of effect and do not begin hunt owing to the excitation of other natural resonance as far as possible, another embodiment of the present invention suggestion, at least one natural inherent frequency of hunt pattern is less than the minimum oscillation frequency of measuring tube 10 instantaneous vibrations, for example, effective frequency f ExcFor this reason, inner part also realizes like this, makes the minimum instantaneous natural inherent frequency of inner part hunt pattern at least always less than the instantaneous minimum natural inherent frequency of measuring tube 10.
Because the decoupling mechanism of implementing relies on the more structurized of above-mentioned torsion oscillator and inner part substantially and can can't help outside change tuning during operation substantially in the above described manner, so naturally, compare with traditional measurement translator that does not have above-mentioned decoupling mechanism, can expect that the off resonance that causes owing to the dielectric attribute that changes is very little.Except density, these can for example be viscosity and/or its temperature of medium with tuning relevant parameter, and want with it with the temperature that also has inner part self.For these situations, for the measurement translator of balance as far as possible can be provided, another embodiment of the present invention proposes, decide the size of inner part like this, make the natural inherent frequency of its hunt pattern less than the minimum oscillation frequency of measuring tube 10 instantaneous vibrations, perhaps the instantaneous natural inherent frequency of at least one of inner part hunt pattern is always less than the instantaneous minimum natural inherent frequency of measuring tube 10.Have been found that in this case the ratio of the minimum natural frequency of measuring tube 10 and the minimum natural frequency of inner part hunt pattern should be greater than 3, and needn't be greater than 20.In this case, find also that for most of application scenarios, it is exactly enough that the ratio of these measuring tube 10 minimum natural frequencys and the minimum natural frequency of inner part hunt pattern remains on about 5～10 narrower working range.
According to another embodiment of the present invention, inner part and two connecting tubes 11,12 match each other like this, make the minimum natural frequency of cross mode of inner part greater than the minimum natural frequency of inner part hunt pattern.Propose in this case especially, inner part and two connecting tubes 11,12 match each other like this, make the ratio of minimum natural frequency and the minimum natural frequency of inner part hunt pattern of inner part cross mode greater than 1.2.Propose in addition, the minimum natural frequency of this inner part cross mode is adjusted to less than 10 with the ratio of the minimum natural frequency of inner part hunt pattern.Also find in this case, for most application scenarios, the minimum natural frequency f of this inner part cross mode LWith the minimum natural frequency f of inner part hunt pattern PRatio to remain on about 1.5～5 narrower working range be exactly enough.
According to another embodiment of the present invention, also propose, two connecting tubes 11,12 are directed so each other and with respect to the virtual longitudinal axis L orientation of virtual connection two attachment section 11#, the 12# of measurement translator, making the distortion that is accompanied by two connecting tubes 11,12, inner part can center on longitudinal axis L swings.For this reason, two connecting tubes 11,12 are so relative to each other directed, make straight substantially pipeline section be basically parallel to that virtual longitudinal axis L extends and align with the longitudinal axis substantially and be in alignment with each other.Because two connecting tubes 11,12 in the illustrated embodiment are straight on their whole length substantially here, so their correspondingly basic integral body is in alignment with each other and aligns with virtual longitudinal axis L.According to an embodiment of the invention, further propose, as the compromise of optimizing spring action and the acceptable installation dimension of measurement translator, the length of each connecting tube 11,12 is at most corresponding to 0.5 times of the bee-line between two attachment section 11#, the 12#.For as far as possible compact measurement translator can be provided, the length of each in two connecting tubes 11,12 is all less than 0.4 times of bee-line between two attachment section.
In order to improve above-mentioned decoupling mechanism, in another embodiment of the present invention, antihunter 20 is manufacturedly than measuring tube 10 weights.In of the present invention further developing, heavy in this situation, the quality m of antihunter 20 20Quality m with measuring tube 10 10Ratio greater than 2.Especially, also like this implement measuring tube 10 and antihunter 20, make the latter's quality m 20Quality greater than the measuring tube that is full of testing medium.Although in order to make antihunter 20 have higher quality m 20But natural frequency still is approximately with the natural frequency of the measuring tube of effective model excitation or at least in its scope, at least also like this implement antihunter 20 in the situation of this embodiment of the present invention, the bending stiffness than measuring tube 10 is higher in the corresponding way to make it.
In order to implement antihunter 20, the particularly heavier but antihunter that has higher bending stiffness simultaneously, and in order to simplify the coupling of antihunter and measuring tube 10 and/or end torsion oscillator, also propose, the plate 21,22 that antihunter to small part utilizes measuring tube 10 sides to be provided with forms.Here in the situation of the embodiment of Xian Shiing, antihunter 20 is to utilize the antihunter plate 21,22 of at least two bendings to form, and wherein the first antihunter plate 21 is positioned at the left side of measuring tube 10, and the second antihunter plate 22 is positioned at the right side of measuring tube 10.At least two have exterior lateral sides for antihunter plate 21,22 arc or arch here substantially separately, its first edge is by providing the edge with respect to the profile of longitudinal axis far-end to form, and second edge is by providing the edge with respect to the profile of longitudinal axis near-end to form.Here among the embodiment of Xian Shiing, at least two antihunter plates 21,22 that form antihunter 20 are basically parallel to measuring tube 10 separately.In another embodiment of the present invention, at least two antihunter plates 21,22 are further implemented so separately and are positioned in the measurement translator with respect to measuring tube 10, make that each the edge that far-end and near-end profile are provided of at least two antihunter plates 21,22 is non-vanishing in the spacing of the zone of the center section of antihunter 20 and longitudinal axis L at least.
Shown in Fig. 2 and 3, further, each such enforcement of at least two antihunter plates 21,22 makes that at least local plate hight is less than in the zone of two attachment section in the zone of the center section of antihunter 20.In this case, local plate hight is corresponding in the minor increment of measuring between the edge that far-end and near-end profile are provided of each at least two antihunter plates 21,22 on the select location of corresponding antihunter plate.Further develop according to of the present invention, each of at least two antihunter plates 21,22 also has minimum plate hight in the zone of the center section of antihunter 20.Further propose, the plate hight of each of at least two antihunter plates 21,22 begins to reduce gradually to the center section of antihunter 20 from attachment section, particularly dull or minimizing continuously.
In another embodiment of the present invention, each of at least two plates 21,22 of formation antihunter 20 all has the profile of basic arch.In the corresponding way, with respect to the outline line of the far-end of longitudinal axis L and each center of gravity line of at least two antihunter plates 21,22 of virtual extension between with respect to the outline line of the near-end of the longitudinal axis crooked equally.Because the arcuate in shape of antihunter 20, the center of gravity line of each of at least two antihunter plates 21,22 are recessed with respect to the longitudinal axis in the scope of middle body at least, protrude with respect to the longitudinal axis in the scope of attachment section at least.
As already mentioned, as required, measuring tube 10 and antihunter 20 are implemented like this, make them externally also have identical or similar at least mass distribution in the similar as far as possible situation of spatial form.In another embodiment of the present invention, propose, the plate 21,22 and the antihunter 20 that form antihunter 20 self have and the crooked comparable or similar at least curved shape of measuring tube.Equally, the center of gravity line of each of at least two antihunter plates 21,22 basic and measuring tube 10 same flexure in the zone of the center section of antihunter 20 at least.Correspondingly, here among the embodiment of Xian Shiing, the antihunter plate 21,22 of formation antihunter 20 and antihunter 20 and whole inner part have the crooked outline of basic U-shaped or V-arrangement.Equally, in this embodiment, in the zone of 20 center sections of the antihunter between two attachment section, the basic U-shaped of center of gravity line of each of at least two antihunter plates 21,22 or V-arrangement form at least.In another embodiment, antihunter plate 21,22 also forms like this and is provided with respect to measuring tube 10, and the center of gravity line of each of feasible at least two antihunter plates 21,22 is basically parallel to the center of gravity line that extends at measuring tube 10 inner chamber internal virtuals.
By the camber profile of antihunter 20 and combining of the plate hight that reduces gradually to the center, antihunter 20 and inner part quality of regulation very simply distribute, particularly barycenter M 10, M 20Relative position, and irrespectively regulate above-mentioned natural frequency f to a great extent therewith 20, f L, f PIn addition, the decoupling mechanism that utilizes the end torsion oscillator to realize can irrespectively mate with above-mentioned criterion by this way to a great extent, because in fact the protruding terminus of antihunter plate and employed gusset plate provide the main contribution for required mass mement of inertia, and on the other hand, their height can be selected in the limit of broad suitably, does not influence above-mentioned other oscillating characteristic of antihunter 20 substantially.
In order can loosely antihunter 20 and the quality or the mass distribution that act in the actual measurement pipe 10 to be complementary as far as possible simply, counterweight element 21 can also particularly releasably be installed on antihunter 20, it is as discrete additional mass.As an alternative or replenish, by forming groove long or annular, can also realize corresponding mass distribution on the antihunter 20.Be applicable to that the quality of the antihunter 20 of particular application or inner part and/or mass distribution can for example utilize FEM (finite element) calculation and/or utilize corresponding calibration measurements and initially determine.Then, in the situation of concrete measurement translator, can be for example in the manner known to persons skilled in the art, simulation calculation and the corresponding calibration measurements of utilizing finite element or other computing machine to support, determine to be selected for the parameter of optimization of matching entrance side and outlet side effective angle, that is, respective quality, mass distribution and/or the mass mement of inertia of measuring tube 10 and antihunter 20 and the physical dimension that obtains thus.
Measurement translator of the present invention is owing to its good mobile equilibrium is specially adapted to for the remarkable coriolis mass flowmeters that medium provided, Coriolis-type mass flowmeter/densimeter or the Coriolis mass and flow/density/viscosity meter of fluctuation of density during operation.

Claims (56)

1. be used for the transducer of vibration type of the mobile medium of pipeline, this measurement translator comprises:
The transducer shell; With
Be arranged on the inner part in the transducer shell, this inner part comprises the measuring tube of a bending at least, this measuring tube is used for boot media and vibration at least off and on during operation, this inner part also comprises antihunter, it is fixed to measuring tube to form first attachment section at entrance side, is fixed to measuring tube to form second attachment section at outlet side;
Wherein inner part utilizes two connecting tubes can oscillatorily be supported in the transducer shell at least, measuring tube communicates with pipeline during operation by this connecting tube, and connecting tube makes that inner part can be during operation around virtual longitudinal axis swing relative to each other and with respect to the virtual longitudinal axis orientation of measurement translator; And
Wherein measuring tube and antihunter are implemented like this and are relative to each other directed, make and the virtual longitudinal axis apart the measuring tube barycenter and all be arranged in the public domain of opening by the virtual longitudinal axis and measuring tube of measurement translator with virtual longitudinal axis antihunter barycenter apart, and the barycenter of the measuring tube longitudinal axis more virtual than the centroid distance of antihunter is farther.
2. measurement translator according to claim 1, wherein the distance of each barycenter and the virtual longitudinal axis is all greater than 10% of ultimate range between the measuring tube and the virtual longitudinal axis.
3. measurement translator according to claim 1, wherein the distance of each barycenter and the virtual longitudinal axis is all less than 90% of ultimate range between the measuring tube and the virtual longitudinal axis.
4. measurement translator according to claim 1, wherein the distance of each barycenter and the virtual longitudinal axis is all greater than 30mm.
5. measurement translator according to claim 1, wherein the diameter of measuring tube is greater than 1mm and less than 100mm.
6. measurement translator according to claim 1, wherein the virtual longitudinal axis of measurement translator is with two virtual linking together of attachment section.
7. measurement translator according to claim 1, wherein measuring tube is U or V-arrangement substantially.
8. measurement translator according to claim 1, wherein measuring tube and antihunter utilize at least one first unitor and utilize at least one second unitor mechanical connection each other at outlet side at entrance side.
9. measurement translator according to claim 1, wherein measuring tube is carried out at least off and on during operation with respect to antihunter and with respect to the bending of the virtual longitudinal axis and is vibrated.
10. measurement translator according to claim 1, wherein the distance of each barycenter and the virtual longitudinal axis and the ratio of measuring tube diameter are all greater than 1.
11. measurement translator according to claim 10, wherein the distance of each barycenter and the virtual longitudinal axis and the ratio of measuring tube diameter are all greater than 2 and less than 10.
12. measurement translator according to claim 1, wherein the quality of antihunter is greater than the quality of measuring tube.
13. measurement translator according to claim 12, wherein the quality of antihunter and the ratio of the quality of measuring tube are greater than 2.
14. measurement translator according to claim 1, wherein antihunter is to utilize the laterally disposed antihunter plate of measuring tube to form.
15. measurement translator according to claim 14, wherein antihunter utilizes at least two antihunter plates to form, and wherein the first antihunter plate is arranged on the measuring tube left side, and the second antihunter plate is arranged on the measuring tube right side.
16. measurement translator according to claim 15, in wherein said at least two antihunter plates each all has exterior lateral sides, its first edge is by providing the edge with respect to the far-end profile of the virtual longitudinal axis to form, and its second edge is by providing the edge with respect to the near-end profile of the virtual longitudinal axis to form.
17. measurement translator according to claim 16, each of wherein said at least two antihunter plates constitutes like this and is placed in the measurement translator, make that at least the edge that far-end and near-end profile are provided of each of described at least two antihunter plates and the distance of the virtual longitudinal axis are non-vanishing in the zone of the center section of antihunter.
18. measurement translator according to claim 17, each such formation in wherein said at least two antihunter plates, make at least in the zone of the center section of antihunter, local plate hight is less than in the zone of two attachment section, and wherein local plate hight is corresponding to the minor increment between each the edge that far-end and near-end profile are provided of described at least two antihunter plates.
19. measurement translator according to claim 18 wherein constitutes like this each in described at least two antihunter plates, makes its plate hight minimum in the zone of the center section of antihunter.
20. measurement translator according to claim 19, wherein constitute like this each in described at least two antihunter plates, make each plate hight of described at least two antihunter plates begin to reduce gradually to the center section of antihunter from attachment section.
21. measurement translator according to claim 20, the plate hight of each of wherein said at least two antihunter plates begins dull or reduce continuously to the center section of antihunter from attachment section.
22. measurement translator according to claim 14, each of wherein said at least two antihunter plates has camber profile.
23. measurement translator according to claim 15, each of the plate of wherein said at least two formation antihunters all is basically parallel to measuring tube.
24. according to claim 14 or 15 described measurement translators, wherein, each in described at least two antihunter plates all has crooked virtual center of gravity line.
25. measurement translator according to claim 24, the center of gravity line of each in wherein said at least two antihunter plates all corresponding antihunter with respect to the far-end outline line of the virtual longitudinal axis of measurement translator and corresponding antihunter with respect to the near-end outline line of the virtual longitudinal axis of measurement translator between virtual extension.
26. measurement translator according to claim 25, the center of gravity line of each in wherein said at least two antihunter plates are recessed with respect to the virtual longitudinal axis of measurement translator in the zone of center section at least.
27. measurement translator according to claim 26, each of wherein said at least two antihunter plates at least in the scope of attachment section with respect to the virtual longitudinal axis projection of measurement translator.
28. measurement translator according to claim 26, the center of gravity line of each of wherein said at least two antihunter plates are U or V-arrangement in the zone of the center section of antihunter at least substantially.
29. measurement translator according to claim 15, the center of gravity line of each of wherein said at least two antihunter plates is basically parallel to the center of gravity line of measuring tube, and this center of gravity line is virtual extension in the measuring tube inner chamber.
30. measurement translator according to claim 1, wherein connecting tube comprises straight substantially pipeline section.
31. measurement translator according to claim 30, wherein connecting tube is so relative to each other directed, makes pipeline section be basically parallel to the virtual longitudinal axis and extends.
32. measurement translator according to claim 31, wherein connecting tube is so relative to each other directed, makes that straight substantially pipeline section is in alignment with each other substantially.
33. measurement translator according to claim 32, wherein connecting tube is so relative to each other directed, makes that straight substantially pipeline section aligns with the virtual longitudinal axis substantially.
34. measurement translator according to claim 1, wherein measuring tube and antihunter are carried out the bending vibration around the virtual longitudinal axis of same frequency during operation at least off and on and at least in part.
35. measurement translator according to claim 34, wherein measuring tube and antihunter are carried out the bending vibration around the virtual longitudinal axis during operation at least off and on, and this bending is vibrated to small part out-phase each other.
36. measurement translator according to claim 35, wherein measuring tube and antihunter are carried out the bending vibration around the virtual longitudinal axis during operation at least off and on, and this bending is vibrated anti-phase substantially each other to small part.
37. measurement translator according to claim 1, wherein the inner part that can oscillatorily be supported in the transducer shell has the nature cross mode, and wherein it is followed the deformation of two connecting tubes during operation and vibrates with respect to the transducer shell and transverse to the virtual longitudinal axis at least off and on.
38. measurement translator according to claim 1, wherein the inner part that can oscillatorily be supported in the transducer shell has the hunt pattern, and wherein it is followed the deformation of two connecting tubes during operation and swings around the virtual longitudinal axis at least off and on.
39. according to the described measurement translator of claim 38,
At least one natural inherent frequency of wherein hunt pattern is less than the minimum oscillation frequency of measuring tube instantaneous vibration.
40. according to claim 38 or 39 described measurement translators, the instantaneous natural inherent frequency of at least one of wherein hunt pattern is always less than the instantaneous minimum natural inherent frequency of measuring tube.
41. measurement translator according to claim 1,
Wherein the inner part that can oscillatorily be supported in the transducer shell has the nature cross mode, and wherein it is followed the deformation of two connecting tubes during operation and vibrates with respect to the transducer shell and transverse to the virtual longitudinal axis at least off and on; And
Wherein the inner part that can oscillatorily be supported in the transducer shell has the hunt pattern, wherein it follows the deformation of two connecting tubes and during operation at least off and on around the swing of the virtual longitudinal axis, and wherein the minimum natural frequency of the cross mode of inner part greater than the minimum natural frequency of the hunt pattern of inner part.
42. according to the described measurement translator of claim 41, wherein the minimum natural frequency of the cross mode of inner part and the ratio of the minimum natural frequency of the hunt pattern of inner part are greater than 1.2.
43. according to the described measurement translator of claim 41, wherein the minimum natural frequency of the cross mode of inner part and the ratio of the minimum natural frequency of the hunt pattern of inner part are less than 10.
44. according to the described measurement translator of claim 41, wherein the minimum natural frequency of the cross mode of inner part and the ratio of the minimum natural frequency of the hunt pattern of inner part are greater than 1.5 and less than 5.
45. according to the described measurement translator of claim 41, wherein at least one natural inherent frequency of the hunt formula of inner part is less than the minimum oscillation frequency of measuring tube instantaneous vibration.
46. according to the described measurement translator of claim 41, wherein at least one instantaneous natural inherent frequency of the hunt pattern of inner part is always less than the instantaneous minimum natural inherent frequency of measuring tube.
47. according to the described measurement translator of claim 46, wherein the minimum natural frequency of measuring tube and the ratio of the minimum natural frequency of inner part hunt pattern are greater than 3.
48. according to the described measurement translator of claim 46, wherein the minimum natural frequency of measuring tube and the ratio of the minimum natural frequency of inner part hunt pattern are less than 20.
49. according to the described measurement translator of claim 46, wherein the minimum natural frequency of measuring tube and the ratio of the minimum natural frequency of inner part hunt pattern are greater than 5 and less than 10.
50. measurement translator according to claim 1 also comprises exciting bank, is used to make the vibration of measuring tube and antihunter.
51. measurement translator according to claim 1 also comprises sensor device, is used to detect the vibration of measuring tube at least.
52. according to the described measurement translator of claim 51, the sensor device that wherein is used to detect the vibration of measuring tube comprises first sensor that at least one is provided with at the entrance side of measuring tube and second sensor that is provided with at the outlet side of measuring tube.
53. according to the described measurement translator of claim 52, the sensor device that wherein is used to detect the vibration of measuring tube comprises that also at least one is arranged on the 3rd sensor of measuring tube entrance side and the four-sensor that is arranged on the measuring tube outlet side.
54. according to the described measurement translator of claim 53, wherein first sensor and the 3rd sensor are oppositely arranged on measuring tube, second sensor and four-sensor are oppositely arranged on measuring tube.
55. the application of the described measurement translator of aforementioned arbitrary claim in the on-line measurement instrument that is used for the mobile medium of measuring channel.
56. according to the described application of claim 55, wherein said on-line measurement instrument is Coriolis mass flowmeter, density measure instrument and/or viscosity measurement instrument.
CN2006800487336A 2005-12-22 2006-11-29 Vibratory measuring transducer Active CN101346611B (en)

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DE102005062007.8 2005-12-22
DE102005062004.3 2005-12-22
DE200510062007 DE102005062007A1 (en) 2005-12-22 2005-12-22 Vibration-type measuring transformer used e.g. as a mass flow measuring device comprises a housing, an inner part arranged in the housing, a curved partially vibrating measuring tube and a counter oscillator
DE200510062004 DE102005062004A1 (en) 2005-12-22 2005-12-22 Mass converter housing for use in coriolis mass through-flow measurement has an inner section and a vibrating mass pipe which has greater dead-point stability
PCT/EP2006/069076 WO2007074014A1 (en) 2005-12-22 2006-11-29 Vibratory measuring transducer

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