CN1159223A

CN1159223A - Stationary coil for a coriolis effect mass flowmeter

Info

Publication number: CN1159223A
Application number: CN 94195166
Authority: CN
Inventors: P·Z·卡洛提; C·B·范卡拉维
Original assignee: Micro Motion Inc
Current assignee: Micro Motion Inc
Priority date: 1994-08-29
Filing date: 1994-08-29
Publication date: 1997-09-10
Anticipated expiration: 2014-08-29
Also published as: CN1066819C

Abstract

A coriolis flowmeter having a pair of parallel vibrating flow tubes equipped with a driver and sensors each comprising a fixed non-movable coil and a pair of magnets affixed to the vibrating flow tubes. Each coil magnetically cooperates with a unique pair of magnets. In a first embodiment, the coil is affixed to a non-movable member of the flowmeter. In another embodiment, the non-movable coil is affixed only to a spring sub-assembly which is affixed to the flow tubes which vibrate out-of-phase with respect to each other.

Description

Stationary coil about the mass flowmeter of complementary effect

Background of invention

The present invention relates to a kind of mass flowmeter of complementary effect, relate in particular to that a kind of to have a cost low, the better sensor of good reliability and performance by and the complementary effect mass flowmeter of drive unit.

Existing problem

With complementary effect mass flow meter measurement mass rate and other information through the mobile material of pipeline is well-known.As 4,491, No. 025 United States Patent (USP) (authorized people such as J.E.Smith on January 1st, 1985 and authorize the Re 31,450 of J.E.Smith February 11 nineteen eighty-two) put down in writing like that, these flowmeters have the one or more straight or crooked flowtube that is configured to.In complementary mass flowmeter, every kind of flowtube structure all has one group of eigentone, and the flowtube structure can be simple bending, distortion or conjugated type (coupled type).Drive each flow duct and on a resonance frequency of these natural modes, produce vibration.Material flows into flowmeter from the connecting line of flowmeter entrance side, directly passes flowtube or some pipes, and flows out flowmeter by outlet side.The eigentone of the system vibration of splendid attire fluid is partly limited together by the quality and the material in the flowtube of flowtube.

When there not being the timing of fluid flows amount, because the driving force that is applied, the have a few of longshore current buret is with identical phase oscillation.When beginning to have material to flow, Coriolis acceleration can make each point of longshore current buret have a different phase place.The phase lag of flowtube entrance side is in driver, and the phase place of flowtube outlet side is ahead of driver.Flowtube is provided with sensor to produce the sinusoidal signal of expression flowtube motion.Phase differential between two sensor signals is directly proportional with the mass velocity that material passes flowtube.

Coil connecting line on the pipe of motion can produce a problem.This is a kind of processing the in two ways usually.On bigger flowmeter, from the amplitude of pipe near zero close support bar a bit begin insulated wire be entangled in pipe with adhesive tape upward and at pipe extend up to coil.The shortcoming of this method is the normally high damping material of adhesive tape or glue and wire insulation material, and the vibration damping that these materials produced can change time and temperature unpredictablely.Change the flow signal that the vibration damping of complementary flowmeter tube can lead to errors.

On smaller flowmeter, the error that vibration damping produces can become bigger, and therefore, thin softness (deflection) conductor can be from the arc end that is connected on the motion coil of stationary end.These deflection vibration dampings are very little, because do not have insulating material or adhesive tape on these conductors.Unfortunately, the deflection conductor has very distinct natural frequency and the identical low vibration absorber that is energized can cause rapid fracture on natural frequency.And their size and crisp fritter make very difficulty of manufacturing.

The present invention is provided with a stationary coil to overcome the problem that moving-coil is produced that connects the line to by adopt a magnet and adjacent two magnets on each pipe.Magnet is orientated like this, promptly they each have in the face of the planar coil identical utmost point and pipe and remove or move on to together (out-phase moves (out-of-phase motion)), these magnets pass coil rapidly and produce auxiliary voltage in coils.Adopt this geometry, the simultaneous movements of pipe (in-phase motion) causes a magnet to cross coil towards hub of a spool, crosses coil and other magnet leaves hub of a spool.The voltage that this motion produces subtracts each other each other and offsets.Therefore, this new geometry only leaches and resembles the such simultaneous movements of motion coil, and line is not connected to the problem on the motion coil.

The amplitude that is designed the sinusoidal signal of generation by fixed coil is directly proportional with the magnetic field of thorough coil.Because field intensity reduces with the distance of leaving magnet, so, keep this just to become very important apart from constant in time, particularly handle and adopt (non-zero) voltage levvl intersection to measure the situation of determining Δ t at electric signal.Keep the constant employing of this distance (at interval) to be directly adjacent to magnet installed on the pipe and coil installed to being difficult on the housing realize that this is because pipe and housing are generally located together fixed to one another and left the magnet distance suitable with coil at concetrated pipe (manifold).Like this, will cause great changes at interval in the very little at the interface manufacturing tolerance of housing-concetrated pipe-pipe.Be not easy very much the control interval as required.In addition, being in operation produces the vibration mode that is encouraged by extraneous vibration, and wherein pipe and housing are opposite each other moves.This changes at interval in a periodic manner and convection current measures the living negative interaction of volume production.

There are four kinds of methods to address this problem.In first method, coil is not to be fixed on the housing but to be fixed on the pipe by the sheet spring.The plane that the orientation of spring makes pipe be parallel to coil is moved and is kept constant at interval.It is motionless that coil keeps, this be because coil stationary between two identical springs, the far-end of spring is equidistant oppositely to be moved.The simultaneous movements of pipe or the vibration of coil are not obvious in voltage signal, and this is the cause of voltage offset.

The second method that solves the variable interval problem is to adopt two coils in each sensor.Two coils are set parallel to each other, and are fixed on the housing and with lead to be connected in series.Flowtube between two coils, each pipe have two fix on it radially relative magnet so that each magnet towards a coil.All 4 magnets (for two coils) have towards their coil separately with identical magnetic pole (arctic or the South Pole).Under the geometric condition of this two coils, if housing moves with respect to pipe, can be littler to the interval of a coil, and can become big equally to the interval of relative coil.Because for little displacement, magnetic field intensity and distance are near linear relationship, so the increase of a closely-spaced voltage that side produces is compensated by the reduction of large-spacing one voltage that side produces.Therefore, this geometry is not influenced by interval variation.

The third method that makes fixed coil not influenced by interval variation is for pipe coil to be set like this, promptly for the main vibration mode between housing and the pipe, does not change at interval.Basic model between pipe and housing is that pipe and housing are in the internal vibration of the plane of pipe.Pipe each other in phase vibration and with the housing out-of-phase vibration.This is called as the housing transverse mode.Usually have only a kind of pattern to have enough low frequency, so that amplitude is obvious.The center of mass of system is near concetrated pipe, and pipe and housing vibrate with rotation mode about this mass centre.Plane by making coil with and the concentric sphere of mass centre is tangent that coil is orientated, although there is the housing transverse mode also to guarantee to remain unchanged at interval.By the optimal relative speed of this mode producing along the tangent line of sphere and in the plane of coil.Tangent line housing-pipe motion perpendicular to flowtube is the pipe motion of the homophase of counteracting.The tangential motion that is parallel to flowtube, promptly the housing transverse mode can have problems under the enough big situation of amplitude.By making coil is rectangle, can cause magnet to move up and down along the straight flange (straight leg) of coil in the vibration of this direction, and the voltage that is produced does not change.

At last, coil can also be orientated by this way, and promptly the interval between the sensor of the left and right sides can in phase become big each other and diminish.As long as the ratio of two amplitudes that sensor produces remains unchanged, phase measurement just is not subjected to the influence of amplitude.In a kind of " standard " sensor was provided with, two sensors were positioned at the bend pipe outside in response to the housing transverse mode, and one increases at interval, and another reduces at interval.But if sensor is positioned at the outside of bend pipe, another is positioned at the inboard of bend pipe, and the interval of left and right sides sensor homophase each other changes, and phase measurement is unaffected.

For the sake of simplicity, sensing coil only has been discussed up to now.Above reasoning also is applicable to driver, just except in general not considering the linearity or the phase place of drive signal.Like this, driver is just just important when considering to drive efficient at interval.Because driver is usually located at the top of pipe,, and do not need employing measure again to keep constant at interval so coil plane is general and the center is tangent at the sphere of mass centre.

As can be seen from the above description, the invention solves and electrical connection extended to the coil of driver and be installed to the problem that sensor element brought on the pipe of vibration of complementary effect flowmeter.Solve this inner connectivity problem or by coil physically being installed on the stationary parts so that coil with physically be installed to the vibrating flow pipe on corresponding magnet magnetic match, or by the motionless spring assembly of driven out-of-phase vibration holding coil coil physically is attached on the flowtube of vibration and makes the coil maintenance static with a relative current buret.

By above and other advantage and characteristics to the present invention may be better understood in the reading below in conjunction with the explanation that accompanying drawing carried out.

Fig. 1 discloses, and to be the present invention be connected to first embodiment on a pair of flowtube with spring assembly with driver and cell winding;

Fig. 2 is the cross-sectional view that the cross section 2-2 along Fig. 1 is got;

What Fig. 3 represented is coil and the magnet that comprises the spring assembly part that is fixed on a pair of flowtube;

What Fig. 4 represented is a coil that is fixed on the complementary effect flowmeter support;

That Fig. 5 represents is another possible embodiment of the present invention, and wherein the magnet of two sensors is positioned on a pair of flowtube facing surfaces with the coil that matches;

What Fig. 6 represented is a kind of flowmeter, and it has the form printed circuit coils on the stationary housing that is attached to flowmeter and is positioned at the top of a pair of flowtube and the magnet on the bottom accordingly;

Fig. 7 is the cross-sectional view that the line 7-7 along Fig. 6 is got;

What Fig. 8 represented is the flattened rectangular coil;

What Fig. 9 represented is a flexible component, and it comprises a pair of form printed circuit coils, and connecting circuit is also arranged to put an electric connector;

What Figure 10 represented is the flexible connector that inserts Fig. 9 of complementary effect flowmeter outer protective cover opening; With

Figure 11 represents another conversion embodiment, and wherein the sphere that cell winding is identical with flowmeter mass centre with center is tangent.

The represented a kind of typical complementary effect mass flowmeter 10 of Fig. 1 has two and is fixed to the flowtube 12 that a cantilever on the concetrated pipe body 30 is installed, 14, so that have essentially identical elastic constant and about separately out-phase bending axis W-W and the moment of inertia of W '-W '.

Drive coil and magnet D be installed in the

top

130 and 130 of flowtube 12,14 ' between the middle part, with about axle W-W and W '-W ' out-of-phase vibration flowtube 12,14.Left side sensor L and right sensor R install near the relative motion of top separately,

flowtube

12,14 tops with detection flows buret 12,14.This detection or top that can be by measuring

flowtube

12,14 are realized by the motion of their zero crossing, are perhaps realized by the movement rate of measuring

flowtube.Arm

131 and 131 on the left of

flowtube

12 and 14 has ' and

right side arm

134 and 134 '.Side branch polymerization downwards mutually and be fixed to concetrated pipe element 121 and 121 ' surface 120 and 120 ' on.Supporting baffle 140R and 140L brazing filler metal on the arm of

flowtube

12,14, are play a part to limit axle W-W and W '-W ', and when through path 156 excitation driver D, flowtube is about axle W-W and W '-W ' out-of-phase vibration.The position of axle W-W and W '-W ' by supporting baffle 140R and 140L flowtube side branch 131,131 ' and 134,134 ' on the displacement decision.

Temperature Detector 22 is installed on the side branch 131 of flowtube 14 approximate temperature with the temperature of measuring flowtube and the material that in flowtube, flows.Determine the variation of flowtube elasticity coefficient with this temperature information.Driver D, sensor L, R and Temperature Detector 22 link to each other with mass flow meter 24 with 159 by path 156,157,158.Mass flow meter 24 can comprise a microprocessor, the signals that this microprocessor processes receives from sensor 18,20 and 22, and the mass flow rate with the material of determine to flow through flowmeter 10 and Other Instruments resembles density of material and temperature.Mass flow meter 24 also provides drive signal through path 156 to driver D, so that manage 12 and 14 about axle W-W and W '-W ' out-of-phase vibration.

Concetrated pipe body 30 is by foundry goods 150,150 ' composition.Foundry goods parts 150,150 ' can pass through ring flange 103,103 ' be connected on feeding pipe and the output pipe (not shown).Concetrated pipe body 30 sends material stream to

flowtube

12,14 from feeding pipe, flow back into output pipe then.When concetrated pipe ring flange 103 and 103 ' by inlet end 104 and endpiece 104 ' when one carries the processing material pipe system (not shown) that will measure and links to each other, material enters concetrated pipe body 30 and concetrated pipe element 110 by the hole (not shown) that enters in the ring flange 103, entering aperture crosses passage (not shown) and the

flowtube

12,14 that foundry goods parts 150 middle sections change gradually and links to each other.By concetrated pipe parts 121 with material separately and determine route enter respectively the

left arm

131 and 131 of

flowtube

14 and 12 '.Then, material flow through head tube parts 131,131 ' and right side arm 134 and 134 ', and be reassembled into flowtube concetrated pipe parts 121 ' in independent material stream.Fluid then determine circuit enter output foundry goods parts 150 ' in the passage (not shown), output to then concetrated pipe parts 110 '.Output end 104 ' by have bolt hole 102 ' ring flange 103 ' link to each other with the pipe system (not shown).

Show drive unit D in Fig. 2 in further detail, Fig. 2 is the sectional view that the line 2-2 along Fig. 1 is got.As Fig. 2 more clearly shown in, driver part comprises 148, one crossbeams 147 of 149, one left springs of a right spring and a coil 142 that is installed on the crossbeam 147.These parts comprise a subassembly, and the end of this subassembly in spring 148 and 149 installed to respectively on the outside surface of flowtube 14 and 12.Magnet 166 is fixed on the outside surface of flowtube 12, and magnet 165 is installed on the outside surface of flowtube 14.Magnet is installed like this, and promptly their arctic is towards identical direction (promptly towards coil).The lower surface of coil 142 has enough areas to surround the magnetic field of magnet 165 and 166.When as a drive operation, the AC drive signal that the unit response of Fig. 2 receives produces the flowtube electromagnetic field of out-of-phase vibration each other make magnet and attaching that magnet be arranged.In this way, make flowtube, be included in the material that flows in the flowtube and on the resonance frequency of flowtube structure, inwardly and outwards move each other.

Left side sensor element L and right sensor element R comprise the similar element of those elements to driver element D shown in Figure 2.The output signal that relatively moves and represent the flowtube motion of the coil response flow buret of each sensor element and their corresponding magnets to produce.Output signal from the coil of sensor element L and R sends mass flow meter parts 24 to through the path 157 and 158 of Fig. 1, and parts 24 are handled these signals and produced the output information of the desirable characteristics that representative will measure for material

mobile flowtube

12 and 14 in.

When as working sensor, the out-of-phase motion of the

magnet response flowtube

12,14 of parts L and R is to produce the additional signal of representing flowtube relative speed respect to one another.Offset about the signal that each produced of in phase vibration, cause not output generation on the lead 157 or 158 of sensor L and R like this by two magnets of sensor.

Fig. 3 has represented about a coil 142 and pair of

magnets

165 and 166 and a conversion embodiment of flowtube 12 and 14.In the embodiment of Fig. 2,

magnet

165 and 166 directly is fixed on the outside surface of flowtube 12 and 14.This need be fixed to magnet on the flowtube with a kind of way (brazing filler metal, welding etc.).The embodiment difference of the embodiment of Fig. 3 and Fig. 2 is coil and magnet be fixed to and comprises crossbeam 147 and spring members 301 ... on 309 the independent spring sub-component.Coil 142 is fixed on the crossbeam 147 with identical mode shown in Figure 2.

Magnet

165 and 166 is fixed on the right turn angle end 306 and 302 of U type spring members 304 and 301 respectively.Spring members 301 has 180 ° of sweeps 308, and spring section 301 comprises part 303 thus, and part 303 is in 90 ° of bendings of its other end, and spring section 301 also comprises part 302.Magnet 166 is fixed to a side of spring section 302, and another surface of spring section 302 is fixed on the flowtube 12 by welding or brazing filler metal.Also a surface with spring section 303 is fixed on the flowtube 12.Spring members 304 is similar to spring members 301.

The place that the embodiment of Fig. 3 is better than the embodiment of Fig. 2 is that it can allow in advance coil to be made as the subassembly that separates with magnet, is fixed on

flowtube

12 and 14 by any suitable attaching device then.Selection has required elasticity and flexible spring members 301 and 304, so that crossbeam 147 and the cable 156 that extends to coil 142 thereof are static substantially and do not move about the out-of-phase vibration of flowtube 12 and 14.For this reason, conductor 156 is not subjected to vibration effect, conversely, the rigidity of conductor 156, vibration damping or other mechanical property can not have a negative impact to the out-of-phase vibration of

flowtube

12 and 14.

The same with the situation of Fig. 2, the parts that the shown embodiment by Fig. 3 forms comprise the driver D of Fig. 1.But except the characteristic of coil 142, the parts of driver D are identical or similar with the parts of the left side of Fig. 1 and right sensor L and R.Therefore, the structure of sensor element L and R is identical with the structure shown in Fig. 2 and 3.

Fig. 4 has represented a non-motion coil 142 and the arrangement that is provided with that is fixed to another conversion that the magnet 165,166 on vibrating

flow pipe

12 and 14

links.Magnet

165 and 166 directly is fixed on flowtube 12 and 14.The plane at coil 142 places and the surface of

magnet

165 and 166 near but separate certain intervals, with predetermined space of formation between the plane of coil 142 and magnet 165 and 166.Coil 142 is fixed on the support with element 402-406 by any such suitable device of screw S that resembles.The

shank

404 and 405 of support is fixed on the inside surface of flowmeter shell 401.Shell 401 encases the

flowtube assembly

12 and 14 of Fig. 1.

The embodiment of Fig. 4 has than the lower advantage of the embodiment complicacy of Fig. 2 and Fig. 3; But the shortcoming that the embodiment of Fig. 4 attaches is that support and coil must accurately be located about shell 401, then shell 401 accurately must be installed on the meter assembly so that

magnet

165 and 166 with coil 142 between the interval equate.In running order and when being subjected to ambient temperature effect when flowmeter, because temperature variation can not influence the gap size between magnet and the coil 142 with being equal to, so, also need extensional shell or shell 401.

In addition, can there be a potential problem, promptly when the relative tube vibration of housing, forms the interval of cyclomorphosis.

The embodiment of Fig. 5 embodiment with Fig. 1 in all respects is identical, just except about the right sensor R of flowtube 14 and resemble coil 143 accordingly and magnet 158 such parts are mounted in the flowtube inside part, rather than resemble and sensor R and corresponding parts thereof are installed in Outboard Sections Fig. 1.

In Fig. 5, it should be noted that magnet and the magnet of coil and right sensor R and inside surface and the outside surface that coil lays respectively at

flowtube

12 and 14 of left sensor element L.The advantage of this set is, for the horizontal in phase vibration or the motion of flowtube, if because sensor element L and R are moved to the left, and their coil and intervals between the magnet separately will increase, so, be increase simultaneously and increase big or small identical at interval.If sensor element L and R move right on the other hand, the magnet of each sensor and the interval between the coil reduce simultaneously.This set has prevented when the interval of a sensor increases, and the interval of another sensor reduces.If this is the case, no longer equal from the relative amplitude of each signal of sensor, and make the signal processing function of mass flow measurement parts 24 more difficult.

Fig. 5 is the front view of the meter of Fig. 1, has therefore only represented flowtube 14 and magnet 145,155 and 158.Flowtube 12 is not shown in Fig. 5, but should know flowtube 12 with regard to adjacent after flowtube 14, it is also understood that on flowtube 12, to be fixed with magnet same as shown in Figure 1 and other parts.

Fig. 6,7 and 8 have represented another embodiment of the present invention together, wherein each a pair of P.e.c. (PC) plate that all contains three coils be positioned at a pair of flowtube that is equipped with the magnet that matches top arm top and below, with driver and the sensor function of the embodiment that realizes Fig. 6.In Fig. 6, top PC circuit board is called parts 604.PC plate 604 is positioned on flowtube 12 and 14.Bottom PC wiring board is under parts 608 and the top arm that is positioned at flowtube 12 and 14.Every PC wiring board has a pancake coil of imbedding its middle part and the flat coil of imbedding in each of its end.The middle part coil of PC wiring board 604 is 602, and a left side and right-hand member coil are 601 and 603.Though in Fig. 6, can not know and see,, bottom PC wiring board 608 have three with PC wiring board 604 on the corresponding coil of coil, three coils of PC plate 608 are parallel to the corresponding coil of plate 604 and adjacent below these corresponding coils.

In Fig. 6, magnet 611,612 and 613 is positioned at and is fixed to the bottom of flowtube 14, with respectively with the left end of bottom PC printed-wiring board (PWB) 608, the coil of middle part and right-hand member matches.Magnet 614,616 and 617 is fixed to the upper face of flowtube 14, to match with the coil 601,602 and 603 of printed-wiring board (PWB) 604 respectively.

Fig. 7 is the sectional view that the line 7-7 along Fig. 6 is got, and has represented the structure member relevant with driver D in further detail.In Fig. 7 further in detail the parts of expression be included on the PC plate 604 coil 602 and on PC plate 608 coil 602A corresponding with it.The magnet that in Fig. 6, does not have expression and flowtube 12 to interrelate.But, be illustrated among Fig. 7 about these magnets of drive unit D, be parts 712 and 714.

The coil that should note imbedding in

wiring board

604 and 608 is rectangle rather than circle.These coils at length are illustrated among Fig. 8, suppose that wherein represented coil is the drive coil 602 of Figure 10.The magnet 616 of front is fixed to the top of flowtube 14.Corresponding magnet is not shown among Fig. 6, but is fixed on the flowtube 12, and is expressed as parts 714 in Fig. 8.Other coil 601 of wiring board 604 with 603 and three corresponding coils of wiring board 608 also be rectangle and identical with coil 602 shown in Figure 8.

Also note that with an independent magnet to replace

magnet

612 and 614, similarly also like this to magnet 712 and 714, can simplified assembly.These longer monolithic magnets can be attached to the outside rather than the top and the bottom of pipe 12 and 14.The working condition of these magnets is identical with the working condition of two parts assembly.In general, the physical distance of two pipes has determined actual coil size, especially the width of coil.The width of PC coil can also be expanded in the side that magnet is arranged on pipe, reduces the sensitivity of coil to simultaneous movements and vibration thus.Along the direction of tubular axis, the relative motion between the parallel conductor of the length of magnet and PC coil can not produce any voltage or can not influence the voltage that is produced by tube vibration.

The advantage that the flattened rectangular coil is imbedded the PC wiring board is and is compared by the thread discrete coil of magnetic, and cost is lower and be subjected to the influence of environment temperature littler.The coil of Fig. 8 is than the easier sealing of discrete coil.And for the coil of imbedding, thin lead will be handled in manufacturing and assembling process.Compare with the discrete homologue of imbedding coil, imbed coil and also have littler and other the advantage of volume and weight, this mainly is because manufacture process is very easy to repeat.

On Fig. 8, show magnet 616 with 714 with relevant coil 606.These magnets are out-of-phase motion each other vertically in the course of the work.This need not consider that really ad hoc structure shown in Figure 8 is to represent driver, or representative sensor.It should be noted that about Fig. 8 the motion of magnet can make magnet magnetic field that produces and the conductor that is straight line substantially intersect, rather than crossing with the conductor of bending.This can harmonic carcellation during as working sensor at coil and magnet, and improve the linearity of signal by the quantity that reduces harmonic wave, if the magnetic field of corresponding magnet and curved conductor rather than straight line conductor intersect, will in signal of sensor, produce this harmonic wave.

Inside between the coil that Fig. 6 and 7 are not shown on Fig. 6 and 7 connects and corresponding electronic unit.Fig. 9 and 10 has represented the preferred embodiments of the present invention, and wherein wiring board is one another in series with 608 respective coil to 604 and is connected.Fig. 9 and 10 has also represented the mode that these coils can link to each other with mass flow measurement parts 24.

Fig. 9 has represented wiring board to 604 and 608, has imbedded three coils in every wiring board.The coil of wiring board 604 is 601,602 and 603.The corresponding coil of wiring board 608 adds that with identical label suffix A represents.Two corresponding coils of wiring board are connected in series.601 and 603 groups of

drive coil

602 and 602A image sensor coil are connected in series like that.Inside connects the coil of two wiring boards by being connected the flexibility circuit 901 between plate 604 and the plate 608.Flexibility circuit 901 902 links to each other with connector PC base 903 about connector plug in the middle.These plugs are suitable for matching with back plane connector, so that the coil line of wiring board links to each other with the input end of source driving signal with electronic unit 24.

Figure 10 has represented how the wiring board of Fig. 9 and connector plug join with the structure of flowmeter.Figure 10 has represented the part details of flowmeter shell 1001.This shell has an opening of putting connector 1002 and plug 1003 thereof.Shell 1001 is fixed on pair of brackets 1004 and 1005 each the one legs, and two wiring boards are fixed on the other leg of each support.For example, about support 1004, its left leg links to each other with the shell 1001 of flowmeter, and its other one leg links to each other with the PC plate 604 that comprises coil 602 by its lower surface.Figure 10 is a sectional view.Printed-wiring board (PWB) 604 comprises the coil 602 of its effective plane parallel in magnet 712 and 612 upper faces, and magnet 712 and 612 is fixed on again on flowtube 12 and 14.Interval between magnet 712,612 and the coil 602 keeps uniformity at work.This is not always the case for driver part and coil and the corresponding magnet of sensor element.

The

magnet

714 and 614 that matches with the plane of coil 602A is respectively fixed to the flowtube 12 of Figure 10 and 14 bottom.

Figure 11 has represented another embodiment, and it makes because of vibration or the problem minimum that is fixed to the magnet on the flowtube and is fixed to the change of the gap size that the relative motion between the sensing coil on the stationary parts of flowmeter produces.Structurally similar to Fig. 1 place of the embodiment of Figure 11 is its casing that comprises flowmeter 10 30, is fixed with a pair of

flowtube

14 and 12 on casing 30, and can only sees flowtube 14 on Figure 11.The left end and the right-hand member that in flowtube are the top 130 of straight line substantially have left sensor L and right sensor R respectively.Magnet 1103 and 1104 and Figure 11 on their homologue (not shown)s of pipe 12 be fixed on the flowtube together.By support 1420 and 1421 left coil 1101 and right coil 1102 are fixed to the stationary parts (not shown).

At work, flowtube can be about being rigidly fixed to cell winding L and the R in phase vibration on the flowmeter with the magnet that links to each other.Need not say, be that such vibration that environmental baseline produced of the vibration of its a part of system can cause the distance (at interval) between coil and the magnet to change by resembling flowmeter again.This variation can influence the signal amplitude of coil L and R, and then signal processing function is gone wrong or variation.By like this sensor installation L and R as shown in the figure, tangent even they and center C M are the rings 1120 of the centre of sphere of dynamic mass of flowtube system, the embodiment of Figure 11 makes magnet and coil this relatively move influence minimum.Because coil 1101 and 1102 is rectangles as shown in Figure 8, so flowtube and magnet make them move with radius 1121 and 1122 centre of sphere CM about quality about the relative motion of coil.This relative motion does not change gap size, and just magnet has laterally mobile about coil.For the pair of magnets at flowtube top 130 each end, this transversal displacement is a homophase.Thisly offset the signal that produces by each magnet effectively, and made each coil not produce the result that output signal laterally moves as this homophase with phase shift.No matter the structure of Figure 11 comes down to sphere, the above-mentioned homophase of flowtube is relatively moved do not produce output signal at coil L and R, and the flowtube travel direction, be i.e. a left side or right, interior and outer as shown in figure 11.

The advantage of the embodiment of Figure 11 is limited to a kind of like this structure, and wherein coil 1101 and 1102 is rigidly fixed on the parts of outside.The advantage of the embodiment of Figure 11 is not suitable for the embodiment of Fig. 2 and 3, because the embodiment of Fig. 2 and 3 will stop magnet and coil that the homophase relative motion is arranged originally.

Can know that from the above description the present invention provides valuably in non-removable mode the sensor of complementary flowmeter and the device of drive coil are installed, so that when the associated flowtube out-of-phase vibration of magnet and coil, coil does not move.This non-removable installation of coil makes coil can not change the performance of the output information that complementary flowmeter the time produced in work or the electric conductor of precision links to each other with corresponding electronic unit by its characteristic.

Know with will be clear that, the desired explanation that the invention is not restricted to most preferred embodiment, but be included in scope of the present invention and interior other improvement and the variation of theme.

Claims

1, a kind of complementary flowtube has first and second flowtube that are substantially parallel to each other;

Be used to make said first and second flowtube about the device of out-of-phase vibration each other;

Be used to detect the sensor device that passes the motion of the said flowtube that said vibrating flow pipe produced by material stream;

Said sensor device comprises:

At least two magnets, each of magnet are fixed to the counterpart on the different pipes of said flowtube;

A coil is basically parallel to the flat substantially surface on the plane that the surface by said two magnets limits near said magnet and having;

Be used for remaining on device on the fixed position of substantially moving about making said coil in the out-of-phase vibration each other at said magnet;

The said vibration that said coil responds said magnet produces a signal of the relative motion of the said vibrating flow pipe of representative, and said motion comprises the motion of the complementary force generation that the material stream of the said mobile vibrating flow pipe of reason inside is produced.

2, the complementary flowmeter of claim 1, the wherein said device that is used to keep comprises:

Holder device is fixed on the non-movable part of said coil and said flowmeter so that said coil is remained on the said fixed position.

3, the complementary flowmeter of claim 1, the wherein said device that is used to keep comprises a spring assembly, said spring members comprises:

First spring members, it has a flat body and an end that is fixed to the first-class buret of said flowtube;

Second spring members, it has a bluff body part and an end that is fixed to second flowtube of said flowtube;

A block part is connected between each the second end of said first and second spring members;

Be used for said coil is connected to the device at the middle part of said block part; With

The out-of-phase vibration that wherein said block part and said coil respond said flowtube remains substantially stationary and does not move.

4, the complementary flowmeter of claim 3, wherein:

Each of said first and second spring members has inner first and second ends that are connected them of elongated axle, the elongated axle of each of said spring members is parallel to each other, and wherein said block part has each an elongated axle of said elongated axle perpendicular to said spring members.

5, the complementary flowmeter of claim 1, the wherein said device that is used to keep comprises a spring assembly, this spring assembly comprises:

First and second parts are the U type and are straight spring members basically;

Each of said elastomeric element has the first end section that is connected to end, the angle part of turning right, one side of each of said elastomeric element is fixed on different of said flowtube, and the opposite side of each of said elastomeric element is fixed on different of said magnet;

A block part is connected between each second end of the said first and second U type elastomeric elements;

Be used for the device that the middle part with said coil and said block part couples together; With

6, the flowmeter of claim 1, wherein each of said sensor is positioned at the difference end on the top of said flowmeter, and wherein said flowmeter also comprises:

Be used for the coil stationary of said each sensor a fixed part, so that the plane of said coil is tangent with the circle that the centre of sphere of the oscillating mass of its center and said flowmeter overlaps to said flowmeter;

Said magnet is fixed on the said flowtube, so that one said plane parallel in the plane of said magnet and the said coil;

Wherein said magnet and said coil cooperatively interact, and motion does not change distance between said magnet and the said coil so that said flowtube is about the centre of sphere of said quality when making said coil remain on the fixed position.

7, a kind of complementary flowmeter has first and second flowtube that are substantially parallel to each other;

Each of said flowtube has closer to each other with parallel straight substantially part;

Be used for the device of the said flowtube of out-of-phase vibration relative to each other;

One first flat substantially printed-wiring board (PWB) is positioned at each a side of said basic flat part of said flowtube;

One second flat substantially printed-wiring board (PWB) is positioned at each the opposite side of said basic flat part of said flowtube;

A plurality of cell windings, each is positioned at a different end of the different printing wiring board of said printed-wiring board (PWB);

Each said flowtube has a plurality of magnets and fixes on it, between the coil of each magnet in its flowtube of fixing and said cell winding, wherein each said cell winding work is to survey the magnetic field that is produced by the different paired said magnet on the various flows buret that is fixed to said flowtube;

Be used in said magnet and flowtube during the device that keeps said printed-wiring board (PWB) basic fixed and do not move about out-of-phase vibration each other;

About out-of-phase vibration each other and when being subjected to the rotary action of the composite force of being given birth to by the miscarriage of the material in the said vibrating flow pipe, said cell winding responds the motion of said magnet to produce the signal of the said pipe of expression relative motion each other in flowtube.

8, the flowmeter of claim 7 wherein saidly is used for device driven and comprises:

A plurality of drive coils, each of said drive coil are positioned at the middle part of the different wiring boards of said printed-wiring board (PWB);

A plurality of magnet, each of said magnet are fixed to the middle part of said straight substantially part of the various flows buret of said flowtube;

Each said magnet is between it fixes in flowtube on it and the said drive coil one, and at least two magnets are between the said pair of pipes of each drive coil and said flowtube;

When said drive coil provides pumping signal, the drive signal that each said drive coil response is received, the flowtube out-of-phase vibration each other that makes said magnet and fixed.

9, the flowmeter of claim 7 also comprises:

Flexible device extends between the said printed-wiring board (PWB), is connected the more corresponding coils of said coil on each of said printed-wiring board (PWB) with inside;

Coupling arrangement at the middle part of said flexible device provides electrical interface with the said coil on said printed-wiring board (PWB);

Said coupling arrangement is in assembling the time is suitable for being inserted into a opening on the shell of said flowmeter, so that said coil and be electrically connected with outside line that said flowmeter interrelates.

10, a kind of method of using complementary flowmeter, said flowmeter has first and second flowtube that are substantially parallel to each other;

Be used to make said first and second flowtube about the device of out-of-phase vibration each other; With

Be used to detect the sensor device of the motion of the said vibrating flow pipe that causes by material stream through the flowtube of said vibration;

The step that said method comprises has:

Each of pair of magnets is fixed to the corresponding part of the different pipes of said flowtube;

Make coil near said magnet, said coil has the flat substantially surface that is basically parallel to the plane that the end by said two magnets limits; With

Said magnet on being fixed to said vibrating flow pipe remains on the fixed position of not moving said coil during about out-of-phase vibration each other substantially;

Be subjected to the effect of the composite force that the material stream in the said flowtube produced and when rotating, said coil responds the said vibration of said magnet and produces the signal of the relative motion of the said vibrating flow pipe of expression at said vibrating flow pipe.

11, the method for claim 10, wherein said maintenance step comprises:

Holder device is fixed in the substrate of said coil and said flowmeter, so that said coil remains on the said fixed position.

12, the method for claim 10, wherein said maintenance step comprises:

The first end of first elastomeric element is fixed on the first-class buret of said flowtube;

The first end of second elastomeric element is fixed on second flowtube of said flowtube;

Block part is connected between each second end of said first and second elastomeric elements;

Said coil is connected to the middle part of said block part;

Wherein when said flowtube out-of-phase vibration, said block part and said coil are maintained fixed and do not move.

13, the method for claim 10, the step that wherein said maintenance step comprises has:

Connect the elastomeric element that first and second parts are the U type, each elastomeric element has a flat substantially body, body has first end and links to each other with the end, angle of turning right, different one of its each a side and said flowtube links to each other, and different one of opposite side and said magnet links to each other;

A block part is connected between each second end of said first and second elastomeric elements;

Said coil is connected to the middle part of said block part;

Respond said flowtube out-of-phase vibration, said block part and said coil are maintained fixed substantially and do not move.

14, a kind of method of using complementary flowmeter, said flowmeter comprises first and second flowtube that are substantially parallel to each other;

Each of said flowtube has a straight substantially part near another straight substantially part of said flowtube; With

Be used to make said flowtube about the device of out-of-phase vibration each other;

The step that said method comprises has:

The first flat substantially printed-wiring board (PWB) is positioned at each a side of said basic flat part of said flowtube;

The second flat substantially printed-wiring board (PWB) is positioned at each the opposite side of said basic flat part of said flowtube;

When said magnet and flowtube during, keep said printed-wiring board (PWB) basic fixed and do not move about out-of-phase vibration each other;

Different one a different different end that is positioned at said printed-wiring board (PWB) with a plurality of cell windings;

A plurality of magnets are fixed on each of said flowtube, and each magnet is between magnet is fixed in flowtube on it and the said coil one, and wherein said two magnets are between each and said flowtube of said coil;

When said flowtube about out-of-phase vibration each other, and when the composite force of giving birth to because of the material in said vibrating flow pipe miscarriage was rotated, the motion that said cell winding responds said magnet produced the signal of the relative motion of the said pipe of expression.

15, the method for claim 14, the step that wherein said actuation step comprises has:

Different one a different medium position that is positioned at said printed-wiring board (PWB) with a plurality of drive coils;

A plurality of magnet are fixed to the said side of the said straight substantially part of said flowtube;

With said magnet between it fixes flowtube on it and said drive coil one, at least two said magnets each drive coil and said this to said flowtube between;

Each of the said drive coil of the magnet on each of approaching said flowtube is used for when when said drive coil provides pumping signal, the flowtube out-of-phase vibration that makes said magnet and fixed.

16, the method for claim 14 also comprises step:

Flexible device is extended between the said printed-wiring board (PWB), be connected each corresponding said coil on each said printed-wiring board (PWB) with inside;

Middle part at said flexible part provides coupling arrangement, provides electrical interface with the said coil on said printed-wiring board (PWB);

Said coupling arrangement the time is suitable for inserting the opening of the shell of said flowmeter in assembling, so that said coil and be electrically connected with outside line that said flowmeter interrelates.