CN1074539C - Coriolis flowmeter - Google Patents
Coriolis flowmeterInfo
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- CN1074539C CN1074539C CN 95115734 CN95115734A CN1074539C CN 1074539 C CN1074539 C CN 1074539C CN 95115734 CN95115734 CN 95115734 CN 95115734 A CN95115734 A CN 95115734A CN 1074539 C CN1074539 C CN 1074539C
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- flowtube
- coriolis flowmeter
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- oscillation
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Abstract
The present invention relates to a Coriolis flowmeter for detecting fluid mass flows and density of a double-tube part of resonant oscillation with high stability. The double-tube part is composed of an inner flow tube and a balancing tube coaxially arranged on the inner flow tube, wherein fluid flows in the inner flow tube; the balancing tube has a balancing body to make the natural frequency of the side direction of the balancing body equal to the natural frequency of the side direction of the flow tube. The flowmeter has a supporting metal device for supporting both ends of the flow tube so that the flow tube is limited in a radial direction, and moves in a connecting flange in an axial direction; the inner flow tube has an extension end with enlarged diameter, and the extension end is supported in a shell flange. The flow tube is supported on a rectangular leaf spring near an end head; the leaf spring has a plane parallel to an oscillation direction, and extends in the radial direction vertical to the oscillation direction in the double-tube part in a shell.
Description
The present invention relates to a kind of Coriolis flowmeter, the Coriolis flowmeter of particularly a kind of double hose or balance weight type.
As everyone knows, Coriolis flowmeter based on principle be, when the fluid of mass flow " m " in the flowtube of its two supports on supportive device, flow and with the vibration that replaces with angular velocity " ω " when being driven around supporting-point, flowtube can be subjected to the influence of the effect of Coriolis power F, Coriolis power F is directly proportional with " ω " vector product of angular velocity with mass flow " m ", and mass flow " m " can be determined according to the Coriolis power F that measures.Just, Coriolis power F can make the flowtube distortion produce a phase differential that is directly proportional with Coriolis power F, just can determine mass flow " m " by measuring this phase differential.In addition, when angle " ω " chosen with flowtube around the free-running frequency " ω o " of the vibration of its supporting-point when equating, the density of fluid " ρ " also can be determined by free-running frequency " ω o ".Flowtube is that to be used to measure of Coriolis flowmeter of Coriolis power F and fluid density " ρ " partly main, and it can be a straight tube or bend pipe.
The curved flowtube of Coriolis flowmeter, its shape is symmetrical with respect to the axle center perpendicular to the axle center of the supporter at support flow buret two ends.When curved flowtube when the direction perpendicular to its baseplane is driven, Coriolis power F is just as being detected at the phase differential with respect to two vibrations that symmetrical opposite location produced of axis of symmetry.Under a constant driving frequency, the mistiming Δ T in two moment when phase differential for example passes through a reference plane as two arms in curved flowtube is measured, and at this reference plane, curved flowtube is to have (not vibration) with static state.The characteristics of this method are that phase differential can be detected with higher sensitivity at phase difference detection moment of torsion partly by increasing bend pipe.Yet, increasing moment of torsion and can cause the size of bend pipe to increase, this just requires the assembly space of an increase.
On the other hand, straight flowtube has the simplest shape, thereby can reduce the size of Coriolis flowmeter.The straight pipe type Coriolis flowmeter of single tube can provide this advantage especially.Yet a multitube Coriolis flowmeter has a plurality of parallel pipes, thereby the equipment with corresponding increased in size, requires to have a menifold part in order to distribute all flowtube equably.This menifold partly is a bending tube, and it is difficult to safeguard, particularly is difficult to clean.
The Coriolis flowmeter of straight pipe type (particularly single tube straight pipe type) has above-mentioned characteristics, but on the other hand, it has straight tube to the bigger rigidity of response Coriolis power and less sensitivity, just, and relatively poor SN (signal/noise) ratio.The method of the S.N ratio of the simplest increase direct current buret is flowtube to be made have thinner wall or long length.Yet, thin flowtube is subjected to the influence of hydrodynamic pressure easily, and long flowtube is because its lower free-running frequency is subjected to the influence of external vibration easily, in addition, also may cause measuring the mistake of mass flow (m) aspect, this is the variation that causes its free-running frequency (ω o) because of the influence of expanded by heating.
Japan's publication instructions discloses a kind of straight pipe type Coriolis flowmeter for 63-158419 number, and wherein at least one measuring tube is installed in one and supports also to pass through in the cylinder ring film within it with two supports.The flowtube that its two ends can both be fixed may suffer because thermal deformation and the mechanical stress that produces within it changes its free-running frequency, supports cylinder and a connecting pipe thereby the vibration of flowtube is sent to.The purpose of using ring film is by using its elasticity to solve the above problems.
If straight tube is still protected same size and dimension; then this method can be eliminated because the noise that measuring condition causes; but it relates to such problem again, thereby promptly ring film directly supports the measuring tube termination and may can cause fatigue that the reliability of its operation is reduced after long-term the use.In addition, well-known flowtube has hurried augmenting portion at the ring film place, has the fluid cavitation of noise vibration there, and measuring stability is reduced widely.In order to detect Coriolis power in high sensitivity, common straight pipe type flowmeter must have the flowtube of a lengthening to reduce rigidity or to require flow rate of fluid to increase.If used the flowtube of lengthening, it may have lower free-running frequency and be subjected to the influence of external vibration easily.Increase rate of flow of fluid and cause the flowtube internal pressure loss to increase again, and increased pipe stress simultaneously.
In order to address the above problem, the applicant had before once proposed a kind of Coriolis flowmeter, it comprises that a cylindrical housing that has the attached flange of concentric at two ends and coaxial heart are placed in the two-tube of connecting body structure in the cylindrical housing, two-tube can move axially but the footpath upwards is restricted.
An outer tube of two-tube part is a balance pipe, it can be regulated with a counterbalance weight makes it have the free-running frequency identical with interior flowtube on the direction perpendicular to interior flowtube axle center, outer tube is fixed on the corresponding cylindrical shape contiguous block together with flowtube with its two ends, and contiguous block is being supported on the wall of shell with O shape ring on the periphery.The O shape ring that the flowtube thermal expansion in the axial direction that the heat of fluid wherein causes owing to flow through can be made by resilient material at two-tube supporting location place is exempted.Therefore flowtube is not subjected to the influence of its internal stress.Yet the O shape ring that contacts with fluid is easy to be subjected to the influence of fluid temperature (F.T.) and pressure thereby may change its supporting location.
The Coriolis flowmeter that a kind of parallel tubular type is arranged, a balance pipe wherein are not to place coaxially with flowtube but in parallel.Balance pipe and flowtube separate, thereby its temperature can be because of the flowtube variation of temperature changes at once, and the stress that produces in flowtube can exert an influence to the vibration of balance pipe.
A fundamental purpose of the present invention provides a kind of Coriolis flowmeter, it can measure mass flow and the density that is placed in a flowtube inner fluid in the outer balance pipe coaxially, outer balance pipe is regulated with an adjustable balanced body so that obtain same side free-running frequency by resonance ground these two kinds of pipes of vibration, it is characterized in that this two-tube part also with its two supports on corresponding supportive device, supportive device is removable in the axial direction but be limited in diametrically in the flange connector of shell, thereby the high sensitivity that has guaranteed the high stability of vibration and measured Coriolis power is not subjected to the influence of fluid temperature (F.T.) and pressure.
Another object of the present invention provides a kind of Coriolis flowmeter, this flowmeter be connected on the corresponding flexible pipe by the two ends of flowtube in will be from two-tube part extended and can not be subjected to the influence of the temperature and pressure of fluid, be bearing in than the other end of pipe on the wall of shell to stablize the supporting-point of two-tube oscillating part.
Another object of the present invention provides a kind of Coriolis flowmeter, wherein the interior flowtube of two-tube part is extended its two ends, two ends respectively are connected on the flexible pipe that is supported in its other end, in addition, two-tube part also is bearing in it near on the end portion by the rectangular sheet spring, each sheet spring all has the plane of an orientation of oscillation that is parallel to two-tube part and radially extends along it, this direction is perpendicular to orientation of oscillation, thereby the two ends of two-tube part can be moved on the direction that also is bearing in vibration regularly in the axial direction thereby two pipes of two-tube part can the vibration of resonance ground.
Another object of the present invention provides a kind of Coriolis flowmeter, wherein the interior flowtube of two-tube part is extended its two ends, respectively there is the opening of an expansion at two ends and flexibly is bearing in the flange connector of shell, thereby the two ends of two-tube part can move in the axial direction and be bearing on the direction of vibration regularly, have guaranteed the stably measured of mass flow.
Provide a kind of Coriolis flowmeter in another object of the present invention, wherein the interior flowtube of two-tube part is extended its two ends, respectively there is the opening (being tubaeform end) of an expansion at two ends and flexibly is bearing in the flange connector of shell, in addition, two-tube part also is bearing near on the end portion by the rectangular sheet spring, each sheet spring all has the plane of an orientation of oscillation that is parallel to two-tube part and radially extends along it, just perpendicular to the direction of orientation of oscillation, thereby the two supports of two-tube part is on four vibration tubercles, two ends can both be moved in the axial direction to eliminate these terminations moving on orientation of oscillation, have guaranteed the high sensitivity of stable vibration and mass flow determination and are not subjected to two-tube thermal expansion influence.
Another object of the present invention provides a kind of Coriolis flowmeter, and this flowmeter can be attached to the quantity of the counterbalance weight on the damper weight and measure the mass flow of fluid under its different density by adjustment.
Another object of the present invention provides a kind of straight pipe type Coriolis flowmeter, this flowmeter can by provide one stably the mode of the thin flat fagging of support flow buret and balance pipe via the simple harmonic oscillation of flowtube quality measurement stream and be not subjected to the influence of external disturbance stably.
Another object of the present invention provides a kind of straight pipe type Coriolis flowmeter, this flowmeter has used with constant resilient material or has had the counterbalance weight that the material of low linear expansion coefficient is made, this material can keep a constant Young ratio (Young ' s ratio) and thermal distortion is kept constant length, the reaction that has prevented the variation of oscillation period and increased its convection cell temperature variation, thereby guaranteed the possibility in compensation coupled oscillations cycle, this cycle only changes according to the temperature of flowtube.
In order to realize above-mentioned purpose of the present invention, a kind of Coriolis flowmeter provided by the invention, it comprises: the cylindrical housing with longitudinal end, on its each end, flange connector is arranged respectively, coaxial two-tube device, it is arranged in this cylindrical housing, so that it is solid diametrically but can move in the axial direction, this two-tube device comprises: allow the interior flowtube that fluid flows through, and be arranged to and should in flowtube coaxial and be fixed on the outer balance pipe on flowtube in this, in order on the orientation of oscillation with identical frequency to the drive unit of antiphase resonance ground vibration flowtube and this outer balance pipe in this, be fixed on this outer balance pipe, be equal to the balanced body of the free-running frequency of flowtube in this in order to the side direction free-running frequency of outer balance pipe with this, in order to detect with act on interior flowtube on the pick-up unit of the phase differential that is directly proportional of Coriolis power, on the vibration tubercle of this two-tube device, this two-tube device is supported on bracing or strutting arrangement on this flange connector, this bracing or strutting arrangement comprises a plurality of rectangular sheet springs, the plane parallel of each this rectangular sheet spring is in the orientation of oscillation of this two-tube device, and this rectangular sheet spring radially extends from this two-tube device in this orientation of oscillation with the plane parallel of each rectangular sheet spring.
Fig. 1 is the sectional view of Coriolis flowmeter on flow direction of a routine.
Fig. 2 is the sectional view of straight parallel tubular type Coriolis flowmeter on flow direction of a routine.
Fig. 3 A shows when the flowtube thermal deformation of the conventional Coriolis flowmeter shown in Fig. 2, the stress that causes in flowtube.
The action direction of the caused stress of parallel straight tube thermal expansion of the Coriolis flowmeter shown in Fig. 3 B displayed map 2.
Fig. 3 C demonstrates the action direction of the caused stress of two straight tube thermal expansions of the Coriolis flowmeter shown in Fig. 1.
Fig. 4 A, 4B and 4C are the views that explanation embodies Coriolis flowmeter of the present invention.
Fig. 5 shows another embodiment of Coriolis flowmeter of the present invention.
Another embodiment of Fig. 6 A and 6B explanation Coriolis flowmeter of the present invention.
Another embodiment of Fig. 7 A and 7B explanation Coriolis flowmeter of the present invention.
Fig. 8 A, 8B and 8C are the views that explanation embodies Coriolis flowmeter of the present invention.
Another embodiment of Fig. 9 A and 9B explanation Coriolis flowmeter of the present invention.
Figure 10 A is the sectional view that flows to of explanation another embodiment of Coriolis flowmeter of the present invention.
Figure 10 B is the skeleton view of the major part of Coriolis flowmeter of Figure 10 A.
Figure 11 A and 11B are the skeleton views of two kinds of rod-type damper weight Coriolis flowmeters of the present invention of explanation.
Figure 12 A, 12B and 12C are the skeleton views that shows the orientation of oscillation of multiple rod-type damper weight.
Figure 13 A, 13B, 13C and 13D are the views of the mode of oscillation of explanation double hose Coriolis flowmeter.
Coriolis flowmeter is divided into two straight pipe types and parallel straight pipe type substantially, they have a single direct current buret, dispose a damper weight that drives jointly with a flowtube on the pipe, its purpose is for measuring Coriolis power and the density that is flowing in the fluid in the flowtube effectively with the sensitivity that increases.A kind of two straight pipe type Coriolis flowmeters of routine and a kind of straight parallel tubular type Coriolis flowmeter of routine will be described below:
Fig. 1 is the sectional views of two straight pipe type Coriolis flowmeters of a routine along the axle center of its flowtube, and it has a columnar shell 1 and has flange connector 2 at two ends
1, 2
2With two-tube 3 in coaxial being arranged on.Two-tube 3 form the major part of Coriolis flowmeter, and it comprises that is allowed a mobile interior direct current buret 4 and the outer straight tube (damper weight) 5 of fluid that can measure within it.Two Guan Yiqi two ends are fixed on common the contiguous block 6a and 6b coaxially.Balance pipe 5 part in the central has the side direction free-running frequency of an adjustable balanced body 10 in order to adjustment pipe 5, thereby makes it can equal side direction free-running frequency by the flowtube 4 of contiguous block supporting.Central authorities that are arranged on two-tube part in order to driving flowtube 4 and drive unit 7 with balance pipe 5 of antiphase resonance oscillations. Paired sensor 8 and 9 is arranged on the two-tube part 3 symmetrically with respect to drive unit 7.These sensors 8 and 9 are used to measure the phase differential of flowtube 4, and this phase differential is to be produced by the effect of Coriolis power.
The contiguous block 6a of two- tube part 3,6b encircles 11a with its outer wall with O shape
1, 11a
2, 11b
1, 11b
2Liquid thickly is sealed in the flange 2a of shell 1
1, 2b
2Inwall 2a
1, 2b
2Go up in case the fluid stopping body flows in the shell 1.
When the temperature difference between two-tube part 3 and the shell 1 takes place when differing greatly owing to fluid temperature (F.T.) and environment temperature, because the difference of thermal expansion therebetween can be in internal stress of generation two-tube part 3 in. O shape ring 11a
1, 11a
2, 11b
1, 11b
2Removing the internal stress of this two-tube part 3, and at the same time, they also have the effect of blocking external vibration as elastic component.
Fig. 2 shows the sectional view of the straight parallel tubular type Coriolis flowmeter of a routine along its flowtube axle center.In Fig. 2, a straight flowtube 4 has with its periphery and is separately fixed at flange connector 2
1With 2
2Interior perverse shape termination 4a and 4b.Be parallel to flowtube 4 and be provided with one, for example, the damper weight 15 of straight pipe type, its two ends are connected on the flow body by web joint 16a and 16b.Balance pipe 15 has a balanced body 10 through regulating at its body middle part, and by this balanced body, its free-running frequency is adjusted to the free-running frequency of flowtube.Two Guan Youyi drive units 7 drive with resonance frequency, and the phase differential that is directly proportional with the Coriolis power that produces in flowtube is then by phase difference sensor 8 and 9 mensuration.When flowing through flowtube 4 during high temperature fluid is being measured flow, flowtube 4 just becomes thermal balance immediately and expands because of hot with fluid.As shown in Fig. 3 A, flowtube 4 has been extended but balance pipe 15 does not expand.Therefore, two web joints 16 tilt an angle θ and reacting force produces a compression stress and at direction N balance pipe 15 produced a drawing stress flowtube 4 in the direction shown in the arrow M with opposite direction from parallel lines Y-Y.This displacement causes web joint 16 run-off the straights and produce bending stress on two tubes 4 and 15.The result is that resonance frequency has changed, and causes making the mistake on the mensuration of mass flow.Double hose Coriolis flowmeter shown in Fig. 1 also may be owing to differential expansion suffers thermal stress, but has following different with parallel tubular type Coriolis flowmeter:
Fig. 3 B and 3C are the views of the thermal stress action direction of the two straight pipe type Coriolis flowmeters shown in the straight parallel tubular type Coriolis flowmeter shown in the key diagram 2 and Fig. 1.Fig. 3 B demonstrates the action direction of the stress that produces owing to parallel straight tube thermal expansion with the cross section, and Fig. 3 C demonstrates the action direction of the stress that produces owing to two straight tube thermal expansions with the cross section.
In the straight parallel tubular type Coriolis flowmeter shown in Fig. 3 B, the thermal stress application point is only with respect to the Y-axis symmetry.In the two straight pipe type Coriolis flowmeters shown in Fig. 3 C, the thermal stress application point is with respect to X-axis, all rotational symmetry of Y-axis and other, compression stress and drawing stress only pipe axially on effect, and thermal expansion on directions X and Y direction to the not influence of vibration of pipe.Have only the axial thermal expansion of pipe just influential to its vibration.
Fig. 4 A, 4B and 4C are the looking of embodiment 1 of explanation Coriolis flowmeter of the present invention.Fig. 4 B is the sectional view after Fig. 4 A quadrature turns to.Is made up of an interior direct current buret 4 and an outer straight balance pipe 5 as two straight tubes 3 of a major part of Coriolis flowmeter, two pipes respectively support coaxially and are fixed on separately the end contiguous block 6a and 6b with its both-end.Balanced body 10 is arranged on the middle part of balance pipe 5 and is fixed on its outer wall along the direction of vibration.Balanced body 10 is chosen to the free-running frequency of the flowtube 4 that the free frequency equilibrium of balance pipe 5 can being become is flowing in it can measure fluid.
On the middle part of flowtube 4 and balance pipe 5 and between be placed with a drive unit 7 in order to shake with resonance frequency antiphase ground flowtube 4 and balance pipe 5.In addition, sensor 8 is placed in two relative positions with 9 symmetrically with respect to drive unit 7.These two sensor flowtube 4 with respect to the displacement of balance pipe 5 with determine with act on flowtube on the phase differential that is directly proportional of Coriolis power.Drive unit 7 and sensor 8 and 9 lead-in wire all terminate in an end 1b and sentence fully and outwards be connected.
The connection of two-tube part 3 meets piece 6a and 6b uses by flexible encapsulant to make O shape ring 11a
1, 11a
2, 11b
1, 11
b2 are bearing in respectively on the outer cylindrical shell 1 corresponding end wall coaxially.Two-tube part 3 is also by sheet spring 12a
1, 12a
2And 12b
1, 12b
2Flexibly be bearing on the inner face of contiguous block respectively.Each sheet spring is a rectangle flexure strip, and it has one and is parallel to along the plane of the orientation of oscillation of the line of a connection drive unit 7 and balanced body 10 and in the footpath that is orthogonal to orientation of oscillation and upwards extends.Form the flowtube 4 of two-tube part 3 and balance pipe 5 by drive unit 7 with a resonance frequency make its by arrow (± F) shown in the vibration of direction antiphase ground.
The Coriolis power that is directly proportional with mass flow is confirmed as one and phase signal, and just sensor 8 and 9 output is poor, the numerical value that is directly proportional.The density of the fluid that can measure also can be determined by resonance frequency.
When the flowtube 4 and the balance pipe 5 of two-tube part 3 is driven into resonance oscillations under free-running frequency, contiguous block 6a, 6b may be according to the vibration in the axial direction slightly of driving frequency amplitude.If two-tube part 3 by the sheet spring at the direction upper support identical with the resonance oscillations direction on shell 1, then the sheet spring may flowtube 4 axially on vibration slightly, and can make bending vibration around rotation slightly with one at the same time perpendicular to the axle center in flowtube axle center.Therefore, the center of gravity of two-tube part may displacement slightly on its direction of rotating slightly.
In contrast, Fig. 4 A, the sheet spring 12a shown in 4B and the 4C
1, 12a
2, 12b
1, 12b
2Be upwards to be supported on the shell 1 in footpath perpendicular to orientation of oscillation.Therefore they have high rigidity on orientation of oscillation, but be easy to two-tube part 3 axially on move.Sheet spring 12a
1, 12a
2, 12b
1And 12b
2Just have and slightly vibrating with reversing but can on orientation of oscillation, not move, guaranteed firm supporting two-tube part 3.
Fig. 4 A, but the Coriolis flowmeter shown in 4B and the 4C can detect the phase signal that is directly proportional with Coriolis power with high sensitivity by using two-tube 3 balanced body 10 that reach with the driving of free-running frequency resonance ground, and the sensitivity of direct current buret is improved thus.This flowmeter passes through by rectangular sheet spring 12a
1, 12a
2And 12b
1, 12b
2The fraction that flexibly supports two-tube part 3 can also flow to the measurement of line stabilization to quality chronically and not be subjected to measure the influence of the temperature and pressure of fluid.Each sheet spring has a flat plane that is parallel to driving direction and along the radially extension perpendicular to driving direction, encircles 11a to replace O shape
1, 11a
2And 11b
1, 11b
2, thereby these O shapes ring only as seal in order to seal channel 2a
1, 2b
2With the inner room of shell, and their elasticity does not make a difference because of the mensuration of the aging variation that produces to mass flow.
Fig. 5 is the view of another embodiment 2 of explanation Coriolis flowmeter of the present invention, and similar to embodiment 1, this flowmeter has a cylindrical housing 1, and a two-tube part 3 is housed in it coaxially.Two-tube part 3 is made of an interior flowtube 4 and an outer balance pipe 5, and this two pipe is bearing on common the contiguous block 6a and 6b together with its two ends coaxially.Balance pipe 5 is provided with a balanced body 10 in the middle in order to the free-running frequency with the balanced one-tenth of its free-running frequency flowtube 4.Therefore two-tube part 3, can be driven with specific free-running frequency resonance ground and sensor 8 and 9 that phase signal that is directly proportional with the Coriolis power that acts on thereon can be attached on it detects by dress drive unit 7 thereon.
In two-tube part, pass corresponding pair of nubs 6a and 6b towards flange connector 2 with its termination than the long flowtube 4 of balance pipe 5
1With 2
2Outstanding.The prominent end of flowtube 4 is connected with 13b with corresponding flexible tubing 13a coaxially, and the other end of flexible tubing is fixed on corresponding flange 2
1With 2
2End portion 2a
1And 2b
2On.
The above embodiments 2 are a kind of Coriolis flowmeters, and it is identical with embodiment 1, can stably fix two-tubely 3, therefore can stably measure the density of mass flow and fluid and can not be subjected to the influence of the temperature and pressure of fluid.
Fig. 6 A and 6B are the views of another embodiment 3 of explanation Coriolis flowmeter of the present invention.Two-tube part 3 shown in Fig. 6 A and the 6B is bearing in by this way coaxially to be made its two ends can be easy in the axial direction move but is restricted diametrically in the cylindrical housing 1.
Two-tube part 3 disposes 10, one drive units 7 of a balanced body and sensor 8 and 9.
Two-tube part 3 is fixed on corresponding pair of nubs 6a and the 6b coaxially with its two ends, and by rectangular sheet spring 12a
1, 12a
2, 12b
1, 12b
2Be bearing on the inwall of shell.Each sheet spring has one and is parallel to the flat plane of orientation of oscillation and in the extension in the radial direction perpendicular to two-tube part 3 orientation of oscillation.Flowtube 4 has prominent end and is connected coaxially on corresponding deflection pipe (being corrugated tube) 13a and the 13b, and the other end of deflection pipe is fixed on the end portion 2a of corresponding flange 2
2And 2b
2On.
Sheet spring 12a
1, 12a
2, 12b
1, 12b
2It is flat rectangle spring, each is fixed on the inwall of shell 1 with the one end, and its other end is connected with contiguous block 6a (or 6b), and its mode is that its flat flat surface is parallel to the orientation of oscillation of two-tube part and extends on a sagittal plane perpendicular to orientation of oscillation.In the Coriolis flowmeter shown in Fig. 6 A and the 6B, when two-tube part 3 is driven with the resonance free-running frequency by drive unit 7, sheet spring 12a
1, 12a
2, 12b
1, 12b
2Since be subjected to the influence of the vibration of two-tube part may have slightly twisting vibration and axial vibration slightly, but two kinds of vibrations can be cushioned by deflection pipe 13a and 13b.Because the sheet spring has bigger rigidity on the direction of flat surface, the possibility of the vibration of two-tube part 3 is eliminated in their sure displacements with its center of gravity.The thermal expansion of metal may produce a relative displacement between two-tube part 3 and cylindrical housing 1, but this displacement is very little, is easy to be cushioned and the unlikely mode of oscillation that influences.
Fig. 7 A and 7B are the views of the another embodiment 4 of explanation Coriolis flowmeter of the present invention.A two-tube part 3 is made up of an interior flowtube 4 and an outer balance pipe 5, and each is bearing on common the contiguous block 6a and 6b coaxially with its two ends.Contiguous block 6a and the 6b flange connector 2 towards shell 1 is passed at the two ends of flowtube 4
1With 2
2Extend.Each jag of flowtube 4 is connected on the termination with diameter of pipe 17a or 17b.The tubaeform termination of this root pipe is fixed on flange 2
1With 2
2The internal channel wall on.Flaring pipe also can be made with flowtube 4 and fuse.
Because tubaeform part 17a and 17b have high rigidity and flexibly distortion easily in the axial direction diametrically, this tubaeform part is housed makes the flowtube 4 of two-tube part 3 to move on axially but be difficult to displacement diametrically at it.Two-tube part 3 can be driven by resonance ground with low driving.Gou Zao Coriolis flowmeter has guaranteed the high sensitivity of mass flow determination like this.
Fig. 8 A, 8b and 8C are the views of another embodiment 5 of explanation Coriolis flowmeter of the present invention.Flowtube 4 be a straight tube wherein stream the fluid that can measure is arranged, but the two ends of straight tube have the tubaeform part 4a and the 4b of axial stretching.Two tubaeform part 4a and 4b liquid thickly are fixed on the respective flanges 21 and 22 inwall of shell 1 with its periphery.
The stretched part of flowtube 4 is together with settling outer balance pipe 5 thereon to constitute a two-tube part 3 coaxially, and wherein two pipes all are bearing on the common corresponding cylindrical shape contiguous block 6a and 6b coaxially with its two ends.A drive unit is installed in the middle part of two-tube part 3, then is arranged on symmetrically on the two-tube part 3 with respect to drive unit in order to the sensor 7 and 8 that detects Coriolis power.Also be provided with the free-running frequency of an outer balanced body 10 in order to adjustment pipe 5 on the balance pipe 5, balanced body is fixed by bolts to an installation site with drive unit 7 along on the antipodal position of diametric(al).In order to guarantee to regulate balanced body, on shell 1, be provided with one and enter flap 1a from the outside.
In addition, sheet spring 12a
1, 12a
2, 12b
1, 12b
2Each is fixed on the outer wall of balance pipe 5 with an one end face, and its other end is fixed on the inwall of shell 1, so that the flat surface of each spring is positioned at a plane, this plane is perpendicular to the axis of flowtube and radially be orthogonal to a line by the center of drive unit 7 (being the orientation of oscillation of two-tube part 3).
At Fig. 8 A, in the Coriolis flowmeter shown in 8B and the 8C, when the fluid that can measure is flowed through flowtube 4, balanced body 10 is conditioned so that the free-running frequency of balance pipe 5 equals near the free-running frequency of flowtube contiguous block 6a and 6b, so two-tube part 3 is just driven with adjusted resonance frequency by drive unit, and a phase differential that is directly proportional with Coriolis power is detected by sensor 8 and 9.
At this moment wait, a resonance oscillations system of being made up of flowtube 4 and balance pipe 5 is by sheet spring 12a
1, 12a
2, 12b
1, 12b
2Be bearing in the middle part, preferably, abut on the inwall of shell 1, and the tubaeform termination 4a of the elongation flowtube 4 of two- tube part 3 and 4b also respectively be bearing on the corresponding flange connector of shell 1 at the vibration tubercle place of two contiguous block 6a and 6b.Use as by four supporting-points and vibratory movement can be sent to the vibration tubercle that the part beyond this system is gone.This system just can stably be vibrated.
The thermal expansion of metal or stress may cause stress in flowtube 4, this stress can be by the tubaeform termination 4a of flowtube 4,4b and sheet spring 12a
1, 12a
2, 12b
1And 12b
2Elastic deformation eliminate and bring influence can not for resonance frequency and testing result.
Can find out significantly from above-mentioned, Coriolis flowmeter of the present invention (Fig. 4 A to Fig. 8 c) belongs to two straight pipe types, it has one by a flowtube 4 and the two-tube part 3 that balance pipe 5 is formed, this two pipe respectively is bearing on common the contiguous block 6a and 6b coaxially with its two ends respectively, also have one and be connected balance pipe 5 middle adjustable and balancing bodies 10 partly are adjusted to flowtube 4 in order to the free-running frequency with balance pipe 5 free-running frequency, drive unit 7 in order to the free-running frequency with resonance drive flowtube 4 and balance pipe 5 and sensor 7 and 8 in order to detect with act on flowtube 4 on the phase differential that is directly proportional of Coriolis power.In coaxial two straight pipe type Coriolis flowmeters, the flowtube 4 of a high rigidity can guarantee the sensitivity of the increase of the Coriolis power of detection effect on flowtube by using the resonance system effectively with the large amplitude hunting of frequency.In addition, flowtube 4 two ends dispose the O shape ring 11a that makes with resilient material
1, 11a
2, 11b
1, 11b
2Or corrugated tube 13a, 13b or tubaeform part 17a (4a), 17b (4b) and by sheet spring 12a
1, 12a
2, 12b
1, 12b
2, be bearing on the inwall of shell 1, consequently flowtube 4 has lowered rigidity on it is axial is enough to eliminate the possible influence that is made expansion of metal and contraction by the heat that can measure fluid.Used the flowtube of this structure to make Coriolis flowmeter can stably measure the quality of fluid and the influence that can not be heated, eliminated the shortcoming of Coriolis flowmeter with direct current buret fixing at two ends.
On the other hand, Coriolis flowmeter is used for the flow measurement to the various fluids with different physics and chemical characteristic.When the fluid that is different from room temperature when a kind of its temperature was flowed through, flowtube 4 was made a response immediately and has been obtained the temperature identical with fluid, and balance pipe 5 changes its temperature lentamente along with the variation of fluid temperature (F.T.).Reason for this reason, flowtube 4 and balance pipe 5 may change the Young modulus of their material along with the change of fluid temperature (F.T.) during initial.
When measuring fluid flow rate, the free-running frequency f of flowtube 4
1Free-running frequency f with balance pipe 5
2Below tabulation is shown:
f
1＝(1/2π)·(K/M
T+M
L) (1)
f
2＝(1/2π)·(K/M
C+M
B) (2)
Wherein K is a spring constant, M
TBe the quality of flowtube 4, M
LBe the quality of fluid when standard density, M
BBe the quality of balanced body 10, M
CIt is the quality of balance pipe 5.
The mass M of balanced body 10
BBe adjusted to a numerical value, make f according to equation (1) and (2)
1=f
2
(do not use sheet spring 12a at the two straight pipe type Coriolis flowmeters of for example damper weight shown in Fig. 7 A and the 7B
1, 12a
2, 12b
1, 12b
2) in, flowtube 4 and balance pipe 5 coaxially each with its two supports on common contiguous block 6a and 6b to form a two-tube part 3, continue outstanding its two ends from this partial discharge pipe 4, respectively have a hydraucone 4a or 4b to be fixed on the inwall 2a or the 2b of the flange connector of shell 1 with its periphery.The mode of oscillation check of flowtube 4 is as follows:
As shown in Figure 13 A, the flowtube 4 of two-tube part 3 is laterally vibrated with the amplitude of d/2, as in from the position of P to Q with shown in solid line and the dotted line.This mode of oscillation has three curve M and Na in central authorities with on two end limits.
Coriolis flowmeter shown in Fig. 7 A can enough little drivings can drive flowtube 4 with resonance frequency effectively, and the position between P and Q point of flowtube 4 has little flexible rigidity and vibrating slightly.Therefore be little in flowtube near the stress that causes in the position of fixed position B, guaranteed the stabilized quality flow measurement.Yet the contiguous block 6a of two- tube part 3 and 6b are bearing on the inwall of shell 1, thereby are easy to be subjected to the influence of external interference and move, and cause the change of equilibrium position and the deviation of measurement result.
Fig. 9 A and 9B are the views of another embodiment 6 of explanation Coriolis flowmeter of the present invention, wherein, similar to the Coriolis flowmeter of Fig. 7 A and 7B, each is bearing in common contiguous block 6a and 6b to form a two-tube part 3 coaxially with its two ends flowtube 4 that it has and balance pipe 5, flowtube 4 continues outstanding its tubaeform termination from this part, and this termination is fixed on the flange 2 of shell 1 with its periphery
1With 2
2Inwall on.
In Fig. 9 A and 9B, with two ends be bearing in coaxially flowtube 4 on contiguous block 6a and the 6b and balance pipe 5 also within it portion supported by flat fagging 14a and 14b near contiguous block 6a and 6b place.At the middle part (in illustrated embodiment) of flowtube 4 that is supported by flat fagging 14a and 14b or balance pipe 5, be provided with a balanced body 10 so that two pipes have same free-running frequency.One in order to the drive part 7 that drives flowtube 4 and balance pipe 5 with the resonance free-running frequency and in order to detect with act on flowtube 4 on the sensor 8 and 9 of the phase differential that is directly proportional of Coriolis power also be arranged on the balance body 5.
Referring to Figure 13 C, the oscillating operation of the Coriolis flowmeter that has flat fagging 14a and 14b shown in Fig. 9 A and the 8B is described below:
Wipe in the vibration in common letter, one freely is bearing in two P points that separate and the flowtube 4 on the Q point is being vibrated with a constant amplitude d.In this example, the flowtube 4 that is freely supporting is being vibrated with a curvature Mb shown in Figure 13 B.The flowtube 4 that is bearing in a some place by each supporting-point P and Q can stably vibrate because its almost completely not influence of the distinctive variation of supported part, this influence at the two ends of flowtube 4 by the description that may take place under contiguous block 6a and the situation that 6b is fixed as relevant Figure 13 A.
Figure 13 C demonstrates the mode of oscillation of the flowtube part between strut 14a and 14b, and fagging 14a and 14b divide set for the supporting double tube part.Since these faggings be flat plate each supporting flowtube 4 with a bit, the flowtube 4 between fagging 14a and 14b driving with the resonance frequency of a uniform amplitude d by drive part 7 and can image pattern 9A in flowtube vibrating with the curvature MC of tube resonance oscillation like that.Flowtube 4 between fagging 14a (14b) and contiguous block 6a (6b) can be with respect to curvature M
CAntiphase curvature N
CVibration.
Because very short and thin plate fagging 14a of one section distance and 14b can use the sheet spring as and rotate around supporting base P and Q with the resonance oscillations of flowtube 4 and balance pipe 5 respectively between P and the C, flowtube just can stably be bearing on a P and the Q, thereby can be driven with the energy efficient of saving.
Figure 13 D demonstrates the mode of oscillation of a flowtube 4, and wherein a plurality of faggings (14a, 14a, 14b, thus 14b) being arranged on and making flowtube 4 (balance pipe 5) can be bearing in a P between contiguous block 6a and the 6b, Pa is on Q and the Qb.
In this example, the same with the example of Figure 13 D, the flowtube 4 between interior fagging 14a and 14b wipes motor pattern with letter and curvature Md vibrates, and just, it can be driven and not make supporting-point P and Q displacement effectively with low driving energy.The peculiar variation of the flowtube that causes because of its stiff end can reduce gradually along with the number of used fagging.Therefore, flowtube can more stably be vibrated between P and Q point, has guaranteed the stably measured of mass flow.
In the Coriolis flowmeter shown in Fig. 9 A and the 9B, damper weight 5 is single tubes that are arranged on coaxially on the flowtube 4.Yet this damper weight 5 also can be single-piece (not being pipe) and a plurality of single-piece (not being single single-piece) of an entity, if its collimation to flowtube 4 can guarantee.
Figure 10 A and 10B are the views of another embodiment 7 of explanation Coriolis flowmeter of the present invention, it and Fig. 9 A and 9B have a band fagging 14a, and the Coriolis flowmeter difference of the straight damper weight of 14b is used a plurality of shaft-like damper weight 20a, 20b, 20c and 20d.Damper weight 20a, 20b, 20c and 20d make and onesize oscillating rod member with same material, are arranged to respect to the axle center symmetry of flowtube and with its two ends respectively to be fixed on common the contiguous block 6a and 6b.Between contiguous block 6a and 6b, damper weight is supported on the driver support plate 7a at flow body 4 middle parts, with respect to the symmetrically arranged sensor support plate of driver support plate 7a 8a, on the 9a, on the fagging 14a that is arranged between sensor support plate 8a and the contiguous block 6a and be arranged on the fagging 14b between sensor support plate 9b and the contiguous block 6b in the formed respective through hole.Flowtube 4 is supported and freely passed by fagging 14a fixed thereon and 14b is formed on sensor support plate 8a, medium pore (not contacting therebetween) on 9b and the driver support plate 7a, thereby the vibration of flowtube 4 can not be subjected to the restriction of above-mentioned each support plate.A drive unit 7 is installed between flowtube 4 and the driver support plate 7a, sensor 8 between flowtube 4 and the sensor support plate 8a and a sensor 9 between flowtube 4 and sensor support plate 9b.The shaft-like damper weight 20a of integral installation, 20b, 20c, the side direction of 20d is selected to the side direction free-running frequency that equals flowtube 4 naturally frequently.Yet the free-running frequency of flowtube may change along with the change of fluid density to be measured.Be the free-running frequency of balanced oscillation system, an adjustable balanced body 10 be housed on the driver support plate 7a in order to regulate free-running frequency outside.The number of shaft-like damper weight is not limited to 4 but can be 2 or more.
Figure 11 A and 11B are the skeleton views of the Coriolis flowmeter of two shaft-like damper weights that uses among key diagram 10A and the 10B.Two embodiment all use shaft- like damper weight 20e and 20f with respect to the axle center of flowtube be arranged on symmetrically one in the plane in its axle center but they have different orientation of oscillation.Just, the Coriolis flowmeter of Figure 11 A comprising in vibration on the upright direction in the plane in flowtube 4 and two damper weight 20e and three axle center of 20f, and the vibration of the Coriolis flowmeter of Figure 11 B is on the direction perpendicular to the plane in the above-mentioned axle center that comprises three members.Other member of Coriolis flowmeter is all similar with the member of flowmeter shown in the 10B to Figure 10 A.
Figure 12 A, 12B and 12C are the views of the orientation of oscillation of a plurality of shaft-like damper weights of explanation.The orientation of oscillation of the damper weight of Figure 12 A displayed map 10A and 10B, the orientation of oscillation of the damper weight of Figure 12 B displayed map 11A, and the orientation of oscillation of the damper weight of Figure 12 C displayed map 11B.Shown orientation of oscillation should be observed from the direction on the surface that is orthogonal to each Coriolis flowmeter fagging 14a.In Figure 12 A, damper weight 20a, 20b, 20c and 20d with identical amplitude vibration on+Y direction, and the vibration of flowtube 4 antiphases ground with damper weight 20a, 20b, 20c and 20d be opposite+the Y direction on.In Figure 12 B, damper weight 20e and 20f with identical amplitude vibration on+Y direction, and flowtube 4 vibrations with damper weight 5e and the same plane of 5f in but antiphase ground on=Y direction.In Figure 12 c, on-Y direction, flowtube 4 then vibrates 90 ° and antiphase ground on+Y direction from damper weight 20e and 20f plane of oscillation with identical amplitude vibration for damper weight 20e and 20f.
At Figure 13 A, in the oscillation system shown in 13B and the 13C, damper weight 20a to 20f is a rod-like element, its each can have less quality in case with flowtube 4 resonance be driven.This feature is to providing a kind of undersized Coriolis flowmeter very for effectively also eliminating the dependence of the accuracy of measurement to the installment state of flowmeter.Though Figure 13 A, the embodiment of 13B and 13C two and four damper weights, the damper weight of any number can both be used, as long as they can vibrate with flowtube resonance ground.
When the temperature variation of fluid, Young's modulus of elasticity also can change, and therefore, spring constant K changes, and causes the free-running frequency f of flowtube 4
1Variation (equation 1) and the free-running frequency f of damper weight 5
2Variation (equation 2).Flowtube 4 is made a response immediately and is obtained the temperature identical with fluid, but damper weight 5 can only change its temperature lentamente, and consequently, the vibration of two-tube part 3 changes lentamente, and it needs a period of time just can reach the degree of stability of vibration.Therefore, can not proofread and correct damper weight 5 effectively and reach fluid temperature (F.T.), because oscillation period can only change lentamente.
In a time T, change to t if can measure the temperature of fluid from t
0, the temperature-responsive fluid temperature (F.T.) T of flowtube 4 then
0Immediately from t
1Degree of changing is to t
0, and the Young modulus of flowtube material has changed, spring constant has also changed.At last, the free-running frequency f of flowtube changes according to equation (1), and if oscillation period remains a constant temperature is constant.A during being represented as during this.
If damper weight 5 is to make as the carbon that is coated with nickel with constant resilient material, then the Young modulus of damper weight does not change with variation of temperature, according to equation (2) free-running frequency f
2Be constant, therefore when fluid temperature variations, during can be constant.B during this oscillation period is represented as.Therefore, the oscillation period of the two-tube part of forming by flowtube 4 and damper weight 53 can according to during A and during B change.Because flowtube 4 can change its temperature along with the temperature t of fluid, the temperature t of fluid just is detected, accurately during τ also be detected.
Use just might the convection cell variation of temperature without delay be made a response with the damper weight 5 of constant resilient material system.As long as according to during the fluid temperature (F.T.) correction and correctly according to the density of determining fluid during proofreading and correct.Used the damper weight made from for example constant steel of material (invar) with low linear expansion coefficient (this steel can the convection cell variation of temperature and the variation of environment temperature keep a constant length) 5, just can make Coriolis flowmeter according to above-mentioned same program with a high reaction time quality of fluid and density definitely effectively.
Claims (13)
1. Coriolis flowmeter, it comprises: has the cylindrical housing of longitudinal end, on its each end, link is arranged respectively,
Coaxial two-tube device, it is arranged in the described cylindrical housing, so that solid diametrically but can move in the axial direction, described two-tube device comprises: allow the interior flowtube that fluid flows through, and be arranged to described in flowtube coaxial and be fixed on described in outer balance pipe on the flowtube
In order on the orientation of oscillation with identical frequency in antiphase resonance ground vibration is described the drive unit of flowtube and described outer balance pipe,
Be fixed on the described outer balance pipe, in order to the side direction free-running frequency with described outer balance pipe be equal to described in the balanced body of free-running frequency of flowtube,
In order to detect with act on interior flowtube on the pick-up unit of the phase differential that is directly proportional of Coriolis power,
On the vibration tubercle of described two-tube device, described two-tube device is supported on bracing or strutting arrangement on the described link,
Described bracing or strutting arrangement comprises a plurality of rectangular sheet springs, and the plane parallel of each described rectangular sheet spring is in the orientation of oscillation of described two-tube device, and described rectangular sheet spring radially extends from described two-tube device in described orientation of oscillation with the plane parallel of each rectangular sheet spring.
2. the Coriolis flowmeter described in claim 1, it is characterized in that: shell and two-tube device encircle with the close O shape of liquid and are supported on the vibration tubercle by the rectangular sheet spring, the rectangular sheet spring respectively has a footpath that is parallel to the plane of orientation of oscillation and extends in two-tube device upwards, and described direction is perpendicular to orientation of oscillation.
3. the Coriolis flowmeter described in claim 1, it is characterized in that: the corresponding site of flowtube extended its two ends towards the link side in the interior flowtube of two-tube device was fixed on from balance pipe, and be connected on the deflection pipe with each elongated end, the deflection pipe has very big flexibility on the direction perpendicular to its axle center, the other end of deflection pipe is connected on the link, and described deflection pipe end is fixed on the flange openings place near shell.
4. the Coriolis flowmeter described in claim 1 or 3, it is characterized in that: deflection Guan Yiqi other end liquid thickly is connected on the link and is bearing in its part place near flange, and two-tube device is bearing on its vibration tubercle by the rectangular sheet spring, the rectangular sheet spring respectively has a footpath that is parallel to the plane of orientation of oscillation and extends in two-tube device upwards, and described direction is perpendicular to direction of vibration.
5. Coriolis flowmeter as claimed in claim 1, it is characterized in that: described two-tube device comprises in order to the stationary installation of fixing described interior flowtube to described outer balance pipe, flowtube is in view of the pipe extension in described, described pipe extension longitudinal extension exceeds described stationary installation and exceeds the end of described outer balance pipe, each described pipe extension has the radial dilatation end, described pipe extension is fixed to corresponding link, described radial dilatation end is provided at the rigidity of reinforcement in the radial direction, so that on described shell,, move in the axial direction and be convenient to described interior flowtube simultaneously for described two-tube device provides stable support.
6. the Coriolis flowmeter described in claim 5, it is characterized in that: the expansion termination of the two-tube device that is connected with the link of shell is supported near on the lugs position, and two-tube device is supported on the vibration tubercle with the O shape ring of liquid pipe and by the rectangular sheet spring, the rectangular sheet spring respectively has a footpath that is parallel to the plane of orientation of oscillation and extends in two-tube device upwards, and described direction is perpendicular to orientation of oscillation.
7. as the Coriolis flowmeter described in the claim 1 to 6 each, it is characterized in that: the amount that is connected the balanced body on the balance pipe is adjustable.
8. as the Coriolis flowmeter described in the claim 1 to 6 each, it is characterized in that: one or more faggings be set at two-tube device each connect side place in order to support flow buret and balance pipe thereof.
9. as the Coriolis flowmeter described in the claim 1 to 6 each, it is characterized in that: damper weight is to make with constant resilient material or material with low linear expansion coefficient.
10. Coriolis flowmeter as claimed in claim 7 is characterized in that: damper weight is to make with constant resilient material or material with low linear expansion coefficient.
11. Coriolis flowmeter as claimed in claim 8 is characterized in that: damper weight is to make with constant resilient material or material with low linear expansion coefficient.
12. a Coriolis flowmeter, it comprises on its each end of a cylindrical housing respectively a link; Its both sides of flowtube are fixed and are arranged on coaxially and make it fixing diametrically but can move in the axial direction within the shell; A plurality of shaft-like damper weights that are shorter than flowtube are parallel and be provided with symmetrically with each with respect to the flowtube axle center and fix on its two ends; A balanced body that is connected on the damper weight is used so that the side direction free-running frequency of damper weight is equal to the side direction free-running frequency of flowtube; A pair of fagging is arranged between two stiff ends of damper weight and flowtube in order to supporting damper weight and flowtube; A driver element is in order to resonance ground oscillatory flow buret and damper weight between a pair of fagging; Sensor device is in order to detect the phase differential that is directly proportional with Coriolis power on the flowtube that acts on resonance oscillations.
13. Coriolis flowmeter as claimed in claim 12 is characterized in that: damper weight is to make with constant resilient material or material with low linear expansion coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95115734 CN1074539C (en) | 1995-09-14 | 1995-09-14 | Coriolis flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95115734 CN1074539C (en) | 1995-09-14 | 1995-09-14 | Coriolis flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1145473A CN1145473A (en) | 1997-03-19 |
| CN1074539C true CN1074539C (en) | 2001-11-07 |
Family
ID=5080637
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95115734 Expired - Fee Related CN1074539C (en) | 1995-09-14 | 1995-09-14 | Coriolis flowmeter |
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| Country | Link |
|---|---|
| CN (1) | CN1074539C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072983B (en) * | 2004-10-05 | 2010-05-05 | 恩德斯+豪斯流量技术股份有限公司 | Composite system, method for producing said system and sensor comprising a composite system of this type |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10351311B3 (en) * | 2003-10-31 | 2005-06-30 | Abb Patent Gmbh | Coriolis mass flowmeter |
| WO2007040468A1 (en) * | 2005-09-19 | 2007-04-12 | Micro Motion, Inc. | Meter electronics and methods for verification diagnostics for a flow meter |
| EP3241011B1 (en) * | 2014-12-30 | 2019-01-02 | Endress+Hauser Flowtec AG | Method for measuring the density of a fluid |
| ES2790851T3 (en) * | 2015-08-28 | 2020-10-29 | Crisi Medical Systems Inc | Flow sensor system including spring contacts |
| EP3350549B1 (en) * | 2015-09-15 | 2021-12-22 | Micro Motion, Inc. | Manifold of a coriolis flow meter |
| CN107462293A (en) * | 2017-07-25 | 2017-12-12 | 大连美天测控系统有限公司 | Mass flowmenter |
| WO2021051273A1 (en) * | 2019-09-17 | 2021-03-25 | 深圳市大疆创新科技有限公司 | Electromagnetic flowmeter, spraying apparatus and movable platform |
| US20230349743A1 (en) * | 2020-06-24 | 2023-11-02 | Micro Motion, Inc. | Method, system, and electronics for correcting a coriolis flow meter measurement for temperature effects |
-
1995
- 1995-09-14 CN CN 95115734 patent/CN1074539C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072983B (en) * | 2004-10-05 | 2010-05-05 | 恩德斯+豪斯流量技术股份有限公司 | Composite system, method for producing said system and sensor comprising a composite system of this type |
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|---|---|
| CN1145473A (en) | 1997-03-19 |
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