CN109425398B - Fluid flow tube, sensor assembly, and coriolis mass flowmeter - Google Patents
Fluid flow tube, sensor assembly, and coriolis mass flowmeter Download PDFInfo
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- CN109425398B CN109425398B CN201710748976.0A CN201710748976A CN109425398B CN 109425398 B CN109425398 B CN 109425398B CN 201710748976 A CN201710748976 A CN 201710748976A CN 109425398 B CN109425398 B CN 109425398B
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- 239000012530 fluid Substances 0.000 title claims abstract description 169
- 238000002955 isolation Methods 0.000 claims description 24
- 230000009977 dual effect Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a fluid flow tube, a sensor assembly and a coriolis mass flowmeter, wherein the fluid flow tube comprises the following components which are communicated in sequence: a fluid input pipeline, one end of which is a fluid input end; one end of the loop pipeline is connected with the other end of the fluid input pipeline through a steering curve; one end of the fluid output pipeline is connected with the other end of the loop pipeline, and the other end of the fluid output pipeline is a fluid output end; wherein the fluid input line further comprises a substantially "S" shaped rectifier tube disposed between the fluid input end and the other end of the fluid input line. The fluid input pipeline is provided with the rectifying pipeline which is basically S-shaped between the fluid input end and the first connecting end, and the fluid before entering the vibrating pipeline is rectified, so that the flow velocity field entering the vibrating pipeline basically has no non-central deviation problem.
Description
Technical Field
The present invention relates to coriolis mass flowmeters, and more particularly to a fluid flow tube, sensor assembly, and coriolis mass flowmeter.
Background
A coriolis mass flowmeter is a meter that directly measures fluid flow with precision. A typical coriolis mass flowmeter body employs two side-by-side U-shaped tubes that vibrate in opposite phase at the same frequency at their resonant frequencies, i.e., they are drawn together or spread apart simultaneously. If fluid is introduced into the tube while the vibrating tube is vibrating synchronously so as to flow forward along the tube, the vibrating tube will force the fluid to vibrate together therewith. In order to counteract this forced vibration, the fluid gives the vibrating tube a reaction force perpendicular to its flow direction, and under the action of this effect, called coriolis effect, the vibrating tube will be deformed in torsion, and the fluid inlet section tube and the fluid outlet section tube will have a difference in time of vibration, called phase time difference. This difference is proportional to the magnitude of the fluid mass flow through the vibrating tube. If the magnitude of this time difference can be detected, the magnitude of the mass flow can be determined. The coriolis mass flowmeter is manufactured according to the principles described above.
At present, according to the quantity of vibrating tubes in the sensor, the vibrating tube can be divided into a single tube shape and a double tube shape, the single tube shape instrument is not split, the flow in the measuring tube is equal everywhere, the stable zero point is well, the vibrating tube is convenient to clean, the vibrating tube is easily interfered by external vibration, and the vibrating tube is only found in early products and some small-caliber instruments. The double-tube instrument not only realizes the measurement of double-tube phase difference, but also increases the signal and enhances the linearity, and simultaneously reduces the influence of external vibration interference.
The tubular structure of the sensor can be roughly divided into a straight tube shape and a bent tube shape, the straight tube meter is not easy to store gas, and the flow sensor is small in size and light in weight. However, the signal with high natural vibration frequency is not easy to detect, so that the natural vibration frequency is not too high, and the pipe wall is often made thinner and is easy to wear and corrode. The instrument pipeline of the bent pipe-shaped detection pipe has low rigidity, relatively larger signal generation and relatively mature technology. Because the self-vibration frequency is low (80-150 Hz), thicker pipe walls can be adopted, the instrument has better wear resistance and corrosion resistance, but additional errors caused by easy gas and residues are cut off, and the installation space is required.
The mature pipe shape in the current market is a double pi-shaped pipe structure, and the sensor structure is the most economical sensor structure at present due to the characteristics of simple structure, easy manufacture, moderate sensitivity and strong shock resistance.
However, when mass flowmeters are used in the food and medical fields, a double pi-tube structure is not basically used, which is because: firstly, the food and medical field have sanitary requirements, and a flow dividing pipeline cannot be arranged in a flowmeter serving as a metering device; secondly, if a single tube is used as a pi-shaped tube, multi-mode coupling can occur due to the complexity of an internal pipeline, and the performance is affected, so that the mass flowmeter generally used in the fields of food and medical treatment can only adopt a single tube or a non-pi-shaped tube structure, thereby not only reducing the metering precision, but also preventing the popularization of the mass flowmeter.
To solve the above-mentioned problems, the prior art has developed a coriolis mass flowmeter having a double pi-type single tube sensor without a shunt structure, such as a coriolis mass flowmeter having a continuous fluid flow tube with a double loop, an input line for receiving fluid from a fluid flow line, an output line for returning fluid to a fluid flow material, and a housing surrounding the double loop, as disclosed in chinese patent document CN1116588C, the flowmeter assembly having: a second loop disposed on the fluid flow tube having first and second ends, the first end receiving flow material from the second end of the first loop and directing flow material through the second end to the output conduit; a crossover section on the fluid flow tube that directs the flow fluid from the first loop to the second loop; a fixed connection part fixedly connected to the housing and the fluid flow tube; and a support bar connected to the first loop and the second loop. In this patent document, three ways are given for the shape of the first loop and the second loop, respectively: the first loop and the second loop are substantially triangular; alternatively, the first loop and the second loop are substantially B-shaped; alternatively, the first loop and the second loop are substantially circular. However, whichever shape the first and second loops of the fluid flow circuit of the patent take, the connecting tube between the inlet circuit and the dual loop for receiving fluid is substantially a C-shaped eccentric parabola, which results in the fluid decelerating inside and accelerating outside of the fluid as it turns through the C-shaped circuit, resulting in an asymmetric flow velocity field that affects the metering performance of the flowmeter.
Disclosure of Invention
It is an object of the present invention to provide a fluid flow tube for a coriolis mass flowmeter that addresses the deficiencies of prior art coriolis mass flowmeter fluid non-centering shifts when entering a vibrating conduit.
To this end, in a first aspect, the present invention provides a fluid flow tube for a coriolis mass flowmeter comprising, in sequential communication:
a fluid input pipeline, one end of which is a fluid input end;
one end of the loop pipeline is connected with the other end of the fluid input pipeline through a steering curve;
one end of the fluid output pipeline is connected with the other end of the loop pipeline, and the other end of the fluid output pipeline is a fluid output end;
wherein the fluid input line further comprises a substantially "S" shaped rectifier tube disposed between the fluid input end and the other end of the fluid input line.
Preferably, the "S" shaped rectifier tube comprises a first bend and a second bend bent in opposite directions along the flow direction of the fluid.
Preferably, the first curved arc, the second curved arc and the steering curved arc are all round curved arcs.
Preferably, the second bend is the same bend direction as the steering bend.
Preferably, the second curved arc has a curved arc radius equal to the curved arc radius of the steering curved arc; the first arc has an arc radius not greater than one half of the second arc radius.
Preferably, the second bend is opposite to the bend of the steering bend.
Preferably, the first curved arc has a curved arc radius equal to the curved arc radius of the steering curved arc; the second arc has an arc radius not greater than one half of the first arc radius.
Preferably, the input line further comprises a straight line tube arranged between the first and second arcs and/or between the second and steering arcs.
Preferably, at least one of the first curved arc, the second curved arc and the steering curved arc is a non-circular curved arc with a curvature which changes.
Preferably, the fluid outlet line is arranged mirror-symmetrically to the fluid inlet line.
Preferably, the loop circuit is a single loop circuit.
Preferably, the loop pipeline is a dual loop pipeline connected in series, the dual loop pipeline comprises a first loop and a second loop which are continuous, the first loop and the second loop are arranged in parallel, the first loop and the second loop are connected through a jumper pipe, the other end of the first loop, which is opposite to the jumper pipe, is connected with the input pipeline, and the other end of the second loop, which is opposite to the jumper pipe, is connected with the output pipe.
In a second aspect, the present invention provides a sensor assembly comprising the fluid flow tube described above.
Preferably, the loop pipeline is a dual loop pipeline connected in series, the dual loop pipeline comprises a first loop and a second loop which are continuous, the first loop and the second loop are arranged in parallel, the first loop and the second loop are connected through a jumper pipe, the other end of the first loop, which is opposite to the jumper pipe, is connected with the input pipeline, and the other end of the second loop, which is opposite to the jumper pipe, is connected with the output pipe; the sensor assembly further includes: the vibration isolation structure at least comprises a first vibration isolation piece fixedly arranged on the loop pipeline to separate the loop pipeline into a vibration pipeline and a non-vibration pipeline.
Preferably, the vibration isolation structure further comprises at least one second vibration isolation member located below the first vibration isolation member and spaced apart from the first vibration isolation member.
Preferably, the first vibration isolator and the second vibration isolator are arranged in pairs on the left side and the right side of the double loop pipeline.
In a third aspect, the present invention also provides a coriolis mass flowmeter comprising:
a housing;
and the sensor assembly is arranged in the shell and is the sensor assembly.
The invention has the advantages that:
1. according to the fluid flow tube provided by the invention, the fluid input end and the first connecting end of the fluid flow tube are provided with the basically S-shaped rectifying pipeline through the fluid input pipeline, so that the fluid before entering the vibrating pipeline is rectified, and the problem of non-central deviation of a flow velocity field entering the vibrating pipeline is basically avoided. In addition, the S-shaped rectifying pipeline not only realizes the effect of rectifying the fluid before entering the vibrating pipeline, but also is the basic requirement of the fluid flow pipe of the coriolis mass flowmeter because the S-shaped rectifying pipeline comprises two circular arcs with 90 degrees of radian, so that the fluid flow direction of the fluid input end of the fluid input pipeline is vertical to the fluid flow direction in the vibrating pipeline, the fluid input end is in the horizontal direction, and the vibrating pipeline is in the vertical direction.
2. Compared with a double-loop pipeline with a split-flow structure, the fluid flow pipe provided by the invention is of an integrated structure, so that the welding is easier to implement, the required welding operation can be reduced, and the distortion of the fluid flow pipe caused by welding is reduced.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a structural view of the coriolis mass flowmeter of the present invention;
FIG. 2 is a view of the housing structure of the coriolis mass flowmeter with a portion cut away;
fig. 3 is a structural view of a fluid flow tube of the coriolis mass flowmeter of the present invention.
Reference numerals:
1-an upstream pipe joint; 2-a downstream pipe joint; 3-a housing; 31-upstream joint opening; 32-downstream joint opening; 4-a fluid flow tube; 41-fluid input line; 411-horizontal input pipe section; 412-a first arc; 413-a second arc; 414-steering arc; 42-fluid output line; 421-horizontal output pipe segment; 47-vibration line; 48-non-vibrating tubing; 5-a first vibration isolator; 6-a second vibration isolation member.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1-3, the fluid flow tube 4 of the embodiment of the present invention has a fluid input line 41 for connection with the upstream line connector 1 to receive fluid material, a fluid output line 42 for connection with the downstream line connector to output fluid material, and a dual loop line connected between the fluid input line 41 and the fluid output line 42. The dual-loop line includes a first loop connected to the fluid input line 41, a second loop connected to the fluid output line 42, and a crossover line connected between the first loop and the second loop, the first loop being disposed parallel to the second loop, specifically, a plane in which the first loop is disposed parallel to a plane in which the second loop is disposed.
As can be seen from the above description, the fluid flow tube 4 according to the embodiment of the present invention is a double-tube type fluid flow tube 4, which is an integrally formed tube, and has the same advantages as the double-tube type fluid flow tube in the prior art, and the fluid flow tube 4 according to the embodiment of the present invention is a double-loop tube arranged in series, that is, a double loop formed by winding a tube around a unique tube, so that it has no split structure, and can meet the technical field that the coriolis mass flowmeter cannot have a split structure, such as a sanitary coriolis mass flowmeter. Since the fluid flow tube 4 has no flow dividing structure and does not need to perform welding operation of the flow dividing structure, the fluid flow tube 4 of the embodiment of the present invention is easier to perform welding and can reduce the welding operation required compared to the double tube type fluid flow tube 4 having the flow dividing structure in the prior art.
The two ends of the fluid flow pipe 4 are respectively connected with the upstream pipe joint 1 and the downstream pipe joint 2, and the specific structure thereof is that the fluid flow pipe sequentially comprises a fluid input pipeline 41, a serially connected double-loop pipeline and a fluid output pipeline 42 from the upstream pipe joint 1 to the downstream pipe joint 2. One end of the fluid input pipeline 41 is a fluid input end, and the other end is a first connection end; one end of the fluid output pipeline 42 is a fluid output end, and the other end is a second connection end; the dual loop is connected between the first connection terminal and the second connection terminal.
In the embodiment of the present invention, the fluid flow tube 4 is provided with a vibration isolation structure, which is divided into a vibration pipe 47 located above the vibration isolation structure and a non-vibration pipe 48 located below the vibration isolation structure by the vibration isolation structure. Because the input and output directions of the fluid are arranged at an angle with the vibration pipeline 47, a section of steering curve 414 is necessarily present on the first loop pipeline before the fluid enters the vibration pipeline 47, and due to the existence of the steering curve 414, the fluid is decelerated by the fluid on the inner side and accelerated by the fluid on the outer side when passing through the steering curve 414, the flow velocity center of the fluid moves outwards, similar to parabolic flow velocity distribution, and the fluid is thrown to the outer side of the curve due to centrifugal force when turning. Thus, the flow velocity field distribution of the fluid flowing into the vibration piping 47 is an eccentric parabola, resulting in a change in sensitivity of the vibration piping 47, affecting the measurement performance of the vibration piping 47.
In order to solve the above-mentioned drawbacks of the fluid flow tube 4, the fluid input tube 41 of the fluid flow tube 4 according to the embodiment of the present invention is provided with a substantially "S" -shaped rectifying tube between the fluid input end and the first connection end, and the "S" -shaped rectifying tube includes a first curved arc 412 and a second curved arc 413 bent in opposite directions along the fluid flow direction, wherein the first curved arc 412 is disposed near the fluid input end, and the second curved arc 413 is disposed near the first connection end. The second arc 413 has the same direction as the steering arc 414, both the second arc 413 and the steering arc 414 are right-hand arcs, and the first arc 412 is left-hand arcs. The eccentricity of the fluid flow field to the right of the first bend 412 occurs and then the flow is rectified by the second bend 413 and the turning bend 414, so that the uniformity of the fluid flow field is improved when the fluid flow field enters the vibration tube 47 through the three bends in a substantially non-centered offset condition. The embodiment of the invention realizes the rectification of the fluid entering the vibration pipeline 47 by arranging the S-shaped rectification pipeline on the fluid input pipeline 41, so that the flow velocity field entering the vibration pipeline 47 is more uniform, which is beneficial to improving the measurement performance of the vibration pipeline 47.
Preferably, the first curved arc 412, the second curved arc 413 and the steering curved arc 414 are all circular curved arcs with an arc of 90 degrees. In the embodiment of the present invention, the radius of the second arc 413 is equal to the radius of the steering arc 414, and the radius of the first arc 412 is equal to one half of the radius of the second arc 413. The unique winding direction of the pipeline not only realizes the function of rectifying the fluid before entering the vibrating pipeline 47, but also leads the first bending arc 412, the second bending arc 413 and the turning bending arc 414 to respectively turn 90 degrees, so that the fluid flow direction of the fluid input end of the fluid input pipeline 41 is perpendicular to the fluid flow direction in the vibrating pipeline 47, the fluid input end is in the horizontal direction, and the vibrating pipeline 47 is in the vertical direction, which is also the basic requirement of the fluid flow tube 4 of the coriolis mass flowmeter. As a preferred embodiment of the present invention, the first and second arcs 412, 413 of the fluid input line 41 of the present embodiment are two consecutive opposite-curved arcs, and the second arc 413 is also directly connected to the steering arc 414. That is, the embodiment of the invention realizes the rectifying effect completely through the curved arc structure. As a preferred embodiment of the invention, the fluid outlet line 42 is arranged in a mirror image of the fluid inlet line 41 in the horizontal direction, i.e. an "S" line is also provided on the fluid outlet line 42, which makes the fluid flow tube 4 a horizontally symmetrical structure in the housing 3 of the coriolis mass flowmeter.
The fluid input pipe 41 according to the embodiment of the present invention further includes a horizontal input pipe section 411 connected to the upstream fluid pipe, and the fluid output pipe 42 further includes a horizontal output pipe section 421 connected to the downstream fluid pipe, where the horizontal input pipe section 411 and the horizontal output pipe section 421 are located on the same axis. The invention is not limited to being on the same axis but in other embodiments the horizontal input pipe section 411 and the horizontal output pipe section 421 may be on the same horizontal plane but not on the same axis.
In the embodiment of the present invention, the material of the fluid flow tube 4 is one of stainless steel, hastelloy and titanium alloy.
As a modification of the rectifying tube of the present invention, the fluid input pipeline 41 includes a straight pipeline disposed between the first curved arc 412 and the second curved arc 413, and a straight pipeline disposed between the second curved arc 413 and the turning curved arc 414, where two straight pipelines may also play a role in rectifying the fluid, that is, a role in a uniform flow field; considering that the two straight lines also perform a rectifying function, in order to ensure that the fluid flowing into the vibration line 47 is uniform, the radius of the first curved arc 412 is smaller than one half of the radius of the second curved arc 413, and the radius of the second curved arc 413 is equal to the radius of the turning curved arc 414.
It should be noted that only one of the two straight lines may be provided, and when only one straight line is provided, the radius of the first curved line 412 needs to be adjusted, but the radius of the first curved line 412 is still smaller than one half of the radius of the second curved line 413.
As a modification of the rectifying tube according to the present invention, the first curved arc 412, the second curved arc 413, and the turning curved arc 414 may be non-circular curved arcs with varying curvatures, in which case the difficulty in processing the fluid flow tube 4 may be increased, but the rectifying effect of the fluid entering the vibration tube 47 may still be achieved.
It should be noted that the loop pipeline of the present invention may also be a single loop pipeline.
The embodiment of the invention also provides a sensor assembly for the Coriolis mass flowmeter, which comprises the fluid flow tube and further comprises a vibration isolation structure, wherein the vibration isolation structure at least comprises a first vibration isolation piece fixedly arranged on the loop pipeline to separate the loop pipeline into a vibrating pipeline and a non-vibrating pipeline.
The vibration isolation structure further comprises at least one second vibration isolation piece which is arranged below the first vibration isolation piece and is arranged at intervals with the first vibration isolation piece. The first vibration isolation piece and the second vibration isolation piece are arranged in pairs on the left side and the right side of the double-loop pipeline.
The embodiment of the invention also provides a coriolis mass flowmeter, which comprises the sensor assembly, and further comprises an upstream pipeline joint 1, a downstream pipeline joint 2, a shell 3, an excitation device, a detection device and a weight increasing structure 7. Wherein the fluid flow tube 4 is installed in the housing 3, the vibration isolation device is installed on the fluid flow tube 4 to separate the fluid flow tube 4 into a vibration pipeline 47 and a non-vibration pipeline 48, the fluid flow tube 4 is also installed with an excitation device and a detection device, the excitation device is used for driving the vibration pipeline 47 to vibrate, when the fluid material is introduced into the pipe to flow forwards along the pipe, the vibration tube will force the fluid to vibrate together with the fluid, the fluid will give a reaction force perpendicular to the flowing direction of the vibration pipeline 47 to the fluid in order to resist the forced vibration, the fluid inlet section pipe and the fluid outlet section pipe have a difference in vibration time, which is called a phase time difference, and the detection device is used for detecting the phase time difference, so as to determine the mass flow through the fluid flow tube 4. The two sides of the shell 3 are provided with an upstream joint opening 31 which is matched with the outer contour shape of the upstream pipeline joint and a downstream joint opening 32 which is matched with the outer contour shape of the downstream pipeline joint, and the upstream pipeline joint 1 and the downstream pipeline joint 2 are respectively welded with the corresponding upstream joint opening 31 and downstream joint opening 32 on the shell 3.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (11)
1. A fluid flow tube for a coriolis mass flowmeter comprising, in sequential communication:
a fluid input pipeline, one end of which is a fluid input end;
one end of the loop pipeline is connected with the other end of the fluid input pipeline through a steering curve;
one end of the fluid output pipeline is connected with the other end of the loop pipeline, and the other end of the fluid output pipeline is a fluid output end;
wherein the fluid input line further comprises a substantially "S" -shaped rectifier tube disposed between the fluid input end and the other end of the fluid input line;
the S-shaped rectifying tube comprises a first curved arc and a second curved arc which are bent to be opposite along the flowing direction of the fluid; the first curved arc, the second curved arc and the steering curved arc are all round curved arcs with 90 degrees;
the second curved arc has the same curved direction as the steering curved arc, the curved arc radius of the second curved arc is equal to the curved arc radius of the steering curved arc, and the curved arc radius of the first curved arc is not more than one half of the curved arc radius of the second curved arc; or alternatively, the first and second heat exchangers may be,
the second curved arc is opposite to the steering curved arc in the curved direction, the curved radius of the first curved arc is equal to the curved radius of the steering curved arc, and the curved radius of the second curved arc is not more than one half of the curved radius of the first curved arc.
2. The fluid flow tube of claim 1, wherein the input conduit further comprises a straight tube disposed between the first and second arcs and/or between the second and steering arcs.
3. The fluid flow tube of claim 1, wherein at least one of the first bend, the second bend, and the steering bend is a non-circular bend having a curvature that varies.
4. A fluid flow tube according to any of claims 1-3, wherein the fluid output conduit is arranged mirror symmetrically to the fluid input conduit.
5. A fluid flow tube according to any of claims 1-3, wherein the loop conduit is a single loop conduit.
6. A fluid flow tube according to any of claims 1-3, wherein the loop line is a series of double loop lines comprising a continuous first loop and second loop, the first and second loops being arranged in parallel, the first loop being connected by a jumper tube, the first loop being connected to the input line at the other end thereof, and the second loop being connected to the output line at the other end thereof.
7. A sensor assembly for a coriolis mass flowmeter comprising the fluid flow tube of any one of claims 1-6.
8. The sensor assembly of claim 7, wherein the loop circuit is a series of dual loop circuits including successive first and second loops disposed in parallel, the first and second loops connected by a jumper tube, the first loop connected to the input circuit at the other end thereof and the second loop connected to the output tube at the other end thereof;
the sensor assembly further includes:
the vibration isolation structure at least comprises a first vibration isolation piece fixedly arranged on the loop pipeline to separate the loop pipeline into a vibration pipeline and a non-vibration pipeline.
9. The sensor assembly of claim 8, wherein the vibration isolation structure further comprises at least one second vibration isolator positioned below the first vibration isolator in spaced relation to the first vibration isolator.
10. The sensor assembly of claim 9, wherein the first vibration isolator and the second vibration isolator are disposed in pairs on left and right sides of the dual loop conduit.
11. A coriolis mass flowmeter, comprising:
a housing;
a sensor assembly mounted within the housing, the sensor assembly being as claimed in any one of claims 7 to 10.
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| US4823614A (en) * | 1986-04-28 | 1989-04-25 | Dahlin Erik B | Coriolis-type mass flowmeter |
| US4825705A (en) * | 1986-10-02 | 1989-05-02 | Rheometron Ag | Mass flow meter with equipment for determination of the coriolis force |
| US5796011A (en) * | 1993-07-20 | 1998-08-18 | Endress + Hauser Flowtech Ag | Coriolis-type mass flow sensor |
| CN1250517A (en) * | 1997-03-11 | 2000-04-12 | 微动公司 | Dual loop coriolis effect mass flowmeter |
| JP2000055710A (en) * | 1998-08-06 | 2000-02-25 | Yokogawa Electric Corp | Coriolis mass flowmeter |
| JP2000241204A (en) * | 1999-02-25 | 2000-09-08 | Osaka Gas Co Ltd | Flow meter |
| CN102016520A (en) * | 2008-05-01 | 2011-04-13 | 微动公司 | Vibratory flow meter for determining one or more flow fluid characteristics of a multi-phase flow fluid |
| CN103630178A (en) * | 2013-11-28 | 2014-03-12 | 四川中测流量科技有限公司 | Mass flowmeter vibration isolation system |
| CN207515856U (en) * | 2017-08-25 | 2018-06-19 | 成都瑞帆智达科技有限公司 | Fluid flow pipe, sensor module and coriolis mass flowmeters |
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| CN109425398A (en) | 2019-03-05 |
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