CN109425399B - Coriolis mass flowmeter and sensor assembly therefor - Google Patents
Coriolis mass flowmeter and sensor assembly therefor Download PDFInfo
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- CN109425399B CN109425399B CN201710748980.7A CN201710748980A CN109425399B CN 109425399 B CN109425399 B CN 109425399B CN 201710748980 A CN201710748980 A CN 201710748980A CN 109425399 B CN109425399 B CN 109425399B
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- 239000012530 fluid Substances 0.000 claims abstract description 168
- 238000002955 isolation Methods 0.000 claims abstract description 61
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims description 19
- 239000000725 suspension Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 10
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 6
- 229910000856 hastalloy Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 10
- 230000005484 gravity Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
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- 238000005259 measurement Methods 0.000 description 5
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- 239000012212 insulator Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
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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
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
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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
- G01F1/8481—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point
- G01F1/8486—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point with multiple measuring conduits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a sensor assembly for a coriolis mass flowmeter, which is provided with an upstream pipeline joint for connecting an upstream fluid pipeline and a downstream pipeline joint for connecting a downstream fluid pipeline, wherein the axes of the upstream pipeline joint and the downstream pipeline joint are positioned on the same central axis, the sensor assembly is arranged in a shell of the flowmeter and comprises a vibrating part and a non-vibrating part which are separated by a vibration isolation structure, the vibration isolation structure at least comprises a first vibration isolation piece for separating a fluid flow pipeline into a vibrating pipeline and a non-vibrating pipeline, and the first vibration isolation piece is arranged close to the central axis. According to the invention, the first vibration isolation piece is arranged close to the central axis, so that the distance from the first vibration isolation piece to the central axis of the upstream and downstream pipeline joint is short, and if the vibration part is discharged outside due to vibration, the distance from the exciting force formed on the vibration isolation piece to the axis of the upstream and downstream connecting position is also short, and the vibration isolation piece cannot rotate due to the eccentricity of the exciting force.
Description
Technical Field
The present invention relates to coriolis mass flowmeters, and more particularly to a sensor assembly having a fluid flow tube with a series double loop conduit and a coriolis mass flowmeter having the sensor assembly.
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 undergo torsional deformation, and the fluid inlet section tube and the fluid outlet section tube will vibrate in succession with a difference in time, called phase time difference, which 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.
However, this prior art still has the following drawbacks in practical use: 1. in the prior art, the vertical distance between the vibration isolation sheet and the central axis of the upstream and downstream pipeline joints is longer, so that when vibration is leaked out from the vibration part, the vertical distance between the exciting force formed on the vibration isolation sheet and the central axis of the upstream and downstream pipeline joints is also longer, and rotation is generated due to the eccentricity of the exciting force. 2. In this prior art, the vibrating portion and the non-vibrating portion for its sensor assembly are all located on the axis of the upstream and downstream pipeline joint, resulting in the center of gravity of the sensor assembly being far from the vertical distance of the axis of the upstream and downstream pipeline joint, thereby causing the non-vibrating portion to vibrate when the vibrating portion of the sensor assembly is vibrated and leaked, affecting the stability of the flowmeter.
Disclosure of Invention
The invention aims to provide a coriolis mass flowmeter and a sensor assembly thereof, which are used for solving the defect that the coriolis mass flowmeter in the prior art rotates due to the eccentricity of exciting force.
To this end, in a first aspect, the present invention provides a sensor assembly for a coriolis mass flowmeter, wherein the flowmeter has an upstream conduit coupling for coupling to an upstream fluid conduit and a downstream conduit coupling for coupling to a downstream fluid conduit, the upstream conduit coupling being on the same centerline as the axis of the downstream conduit coupling, the sensor assembly being mounted within a housing of the flowmeter and comprising a vibrating portion and a non-vibrating portion separated by a vibration isolation structure, the vibration isolation structure comprising at least a first vibration isolator separating the fluid flow conduit into a vibrating conduit and a non-vibrating conduit, the first vibration isolator being disposed proximate the centerline.
Preferably, the first vibration isolation member is located above or below the central axis, and the vertical distance between the first vibration isolation member and the central axis is 0-20mm.
Preferably, the vertical distance between the first vibration isolation member and the central axis is 0-10mm.
Preferably, the torque difference between the vibrating portion and the non-vibrating portion with respect to the central axis is 0-20% of the torque value from the vibrating portion to the central axis.
Preferably, the difference in moment between the vibrating portion and the non-vibrating portion with respect to the horizontal line on which the first vibration isolator is located is 0.
Preferably, the sensor assembly comprises
A fluid flow tube having a fluid input line and a fluid output line, a dual loop line connected in series between the fluid input line and the fluid output line; the double loop pipeline is divided into a vibrating pipeline and a non-vibrating pipeline through the vibration isolation structure;
the excitation device is arranged on the vibrating pipeline and used for driving the vibrating pipeline to vibrate;
the detection device is arranged on the vibrating pipeline and is used for detecting the relative speed of the vibrating pipeline;
the weight increasing structure is arranged on the non-vibrating pipeline;
the excitation device, the vibration pipeline and the detection device form the vibration part; the weight increasing structure and the non-vibrating pipeline form the non-vibrating part.
Preferably, the dual-loop pipeline comprises a first loop connected with the fluid input pipeline and a second loop connected with the fluid output pipeline, the plane of the first loop is parallel to the plane of the second loop, and the first loop and the second loop are connected through a bridging pipeline.
Preferably, the exciting device comprises a driving coil arranged at the middle part of two loops of the vibration pipeline; and/or the detection means comprise a first detection sensor and a second detection sensor arranged at respective corners of the topside portions of the two loops of the vibrating conduit.
Preferably, the weighting structure is a counterweight fixedly mounted on the non-vibrating pipeline.
Preferably, the material of the fluid flow tube is one of stainless steel, hastelloy and titanium alloy; and/or the balancing weight is made of one of stainless steel, hastelloy, titanium alloy and spheroidal graphite cast iron.
Preferably, the distance between the balancing weight and the root of the vibrating pipeline on the non-vibrating pipeline is 30% -50% of the vertical extension length of the non-vibrating pipeline.
Preferably, the balancing weight is a suspension horizontally erected on the non-vibration pipeline, and the suspension is symmetrically arranged in the horizontal direction of the non-vibration pipeline.
Preferably, the suspension is a rectangular block having a certain thickness.
Preferably, the minimum length and width dimensions of the rectangular block are consistent with the dimensions of the space formed by the outer edges of the non-vibrating conduit.
Preferably, the thickness of the rectangular block is 0.5-1.5 times of the outer diameter of a single pipeline of the non-vibrating pipeline.
Preferably, the thickness of the rectangular block is 1 time of the outer diameter of a single pipeline of the non-vibrating pipeline.
Preferably, according to the flow direction of the fluid material in the fluid flow tube, the suspension is provided with a first through hole, a second through hole and a third through hole for the first loop to pass through, and a fourth through hole, a fifth through hole and a sixth through hole for the second loop to pass through, wherein the second through hole and the third through hole of the first loop are arranged on the left side and the right side of the edge of the rear end of the suspension and are symmetrically arranged, the fourth through hole and the fifth through hole of the second loop are arranged on the left side and the right side of the edge of the front end of the suspension and are symmetrically arranged, and the first through hole of the first loop and the sixth through hole of the second loop are positioned between other through holes and are symmetrically arranged on the left side and the right side.
A coriolis mass flowmeter comprising:
a housing;
a sensor assembly mounted inside the housing;
the sensor assembly is the sensor assembly.
The invention has the advantages that:
1. the sensor component for the Coriolis mass flowmeter provided by the invention has the advantages that the axial lines of the upstream pipeline joint and the downstream pipeline joint of the flowmeter are positioned on the same central axis, the sensor component comprises a vibrating part and a non-vibrating part which are separated by the vibration isolation structure, the vibration isolation structure at least comprises a first vibration isolation piece which separates the fluid flow pipe into a vibrating pipeline and a non-vibrating pipeline, the first vibration isolation piece is arranged close to the central axis, so that the distance from the first vibration isolation piece to the central axis of the upstream pipeline joint and the distance from the first vibration isolation piece to the central axis of the downstream pipeline joint are shorter, and if the vibrating part has vibration, the distance from the exciting force formed on the vibration isolation piece to the axial line of the upstream connecting position and the downstream connecting position is shorter, and the vibration isolation piece cannot rotate due to the eccentricity of the exciting force.
2. The sensor component for the Coriolis mass flowmeter provided by the invention has the advantages that the upstream and downstream pipeline joints are positioned on the same central axis, and the sensor component is divided into the vibrating part and the non-vibrating part through the vibration isolation structure. Therefore, no matter what reason the vibration part of the sensor is out of the way, the vibration of the non-vibration part of the whole sensor is difficult to be caused, and the stability of the flowmeter is improved.
3. The sensor assembly for the coriolis mass flowmeter provided by the invention has the advantages that the moment difference value of the vibrating part and the non-vibrating part relative to the horizontal line of the first vibration isolation piece is 0-20% of the moment value of the vibrating part to the horizontal line. Through this kind of setting for if vibrating portion takes place the vibration and leaks, because vibrating portion and non-vibrating portion are less with the moment difference of the horizontal line of first vibration isolation member, can offset basically, be favorable to improving the stability of flowmeter.
4. The sensor component for the Coriolis mass flowmeter provided by the invention has the advantages that as the fluid flow tube of the sensor component is provided with a double-loop pipeline, the sensor component provided by the invention is a double-tube type instrument, so that the measurement of double-tube phase difference is realized, the signal enhancement linearity is increased, and meanwhile, the influence of external vibration interference is reduced; because the fluid flow tube is a serial pipeline, namely a pipeline, the sensor component provided by the invention is a double-tube type instrument without a flow dividing structure, and is widely applied to the technical field that the flow dividing structure cannot be provided for the coriolis flowmeter, such as a sanitary coriolis mass flowmeter; and because of no shunt structure, not only is the welding easier to implement, but also the required welding operation can be reduced; according to the sensor assembly, the weight increasing structure is arranged on the non-vibrating pipeline of the fluid flow pipe, so that the gravity center of the sensor assembly is adjusted by arranging the weight increasing structure on the non-vibrating pipeline, the vibrating state is improved, and the vibration coupling between the non-vibrating pipeline and the vibrating pipeline is reduced; the weight-increasing structure and the non-vibrating pipeline are not contacted with the shell of the coriolis mass flowmeter, which is the core difference between the invention and the sensor assembly of the coriolis mass flowmeter disclosed in the patent document CN1116588C, in the sensor assembly of the coriolis mass flowmeter disclosed in the patent document CN1116588C, the fixed connection part and the shell base are directly welded together, and the shell base, the shell cover and the fixed connection part adopt quite large mass, but the distortion caused by welding can only be reduced, the distortion cannot be completely eliminated and the vibration separation effect is limited, while the sensor assembly, the weight-increasing structure and the non-vibrating pipeline are not contacted with the shell of the flowmeter, so that the non-vibrating part of the sensor assembly is not rigidly connected with the shell of the flowmeter, which is beneficial to improving the vibration isolation effect and obtaining stable zero point and excellent metering performance of the flowmeter.
5. The sensor component provided by the invention has the advantages that the weight increasing structure is the balancing weight fixedly arranged on the non-vibrating pipeline, the structure is simple, the processing and the production are easy, the production cost is increased a little while the stable zero point and the excellent metering performance are obtained, and the market popularization and the mass production are facilitated.
6. According to the sensor assembly provided by the invention, the balancing weight and the fluid flow tube are made of the same material, and are connected through welding, so that good welding and physical properties are obtained, and the stability and metering performance of the sensor assembly are improved.
7. The sensor component provided by the invention has the advantages that the balancing weight and the fluid flow tube can be made of different materials and are fixedly connected in a mechanical mode, the mechanical fixing mode is various, the fixing is more flexible, and the environmental pollution and the human body injury caused by welding can be reduced.
8. According to the sensor assembly provided by the invention, the balancing weight is arranged on the non-vibrating pipeline far away from the root of the vibrating pipeline (namely the joint of the vibrating pipeline and the non-vibrating pipeline), and the more the balancing weight is far away from the root of the vibrating pipeline, the better the vibration isolation effect of the vibrating pipeline and the non-vibrating pipeline is, and by the arrangement, the balancing weight with small mass can be adopted under the condition of ensuring certain metering performance of the sensor assembly, so that the materials are saved, and the cost is reduced.
9. According to the sensor assembly provided by the invention, the fluid input end and the first connecting end of the fluid input pipeline are provided with the basically S-shaped rectifying pipeline, so that the fluid before entering the vibrating pipeline is rectified, and the flow velocity field entering the vibrating pipeline basically has no non-central deviation problem. 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.
10. The sensor component provided by the invention is of an integrated structure, so that compared with a double-loop pipeline with a shunt structure, the sensor component is easier to weld, the required welding operation can be reduced, and the distortion of a 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 the coriolis mass flowmeter of the present invention in accordance with the housing structure of FIG. 2;
FIG. 4 is a structural view of a fluid flow tube of the coriolis mass flowmeter of the present invention;
FIG. 5 is a structural view of a coriolis mass flowmeter according to another embodiment of the invention;
FIG. 6 is a structural view of a fluid flow tube of a coriolis mass flowmeter according to another embodiment of the invention;
fig. 7 is a schematic diagram of the structure of a hanging drag of a 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 isolator; 7-weight gain structure; 71-hanging and dragging; 711-a first via; 712-a second via; 713-a third through hole; 714-fourth vias; 715-a fifth through hole; 716-sixth through hole; 72-sub-balancing weight.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1-4, the present embodiment provides a coriolis mass flowmeter comprising an upstream conduit joint 1, a downstream conduit joint 2, a housing 3, a fluid flow tube 4, an excitation device, a detection device, a vibration isolation structure, and a weighting 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. In this embodiment, the exciting device is disposed on the vibrating tube and is used for driving the vibrating tube to vibrate; the detection device is arranged on the vibrating pipeline and used for detecting the relative speed of the vibrating pipeline; the weight increasing structure is arranged on the non-vibrating pipeline; the excitation device, the vibration pipeline and the detection device form the vibration part; the weight increasing structure and the non-vibrating pipeline form the non-vibrating part. Specifically, the excitation device comprises a driving coil arranged at the middle part of two loops of the vibration pipeline; the detection means comprise a first detection sensor and a second detection sensor arranged at respective corners of the topside portions of the two loops of the vibrating conduit.
As shown in fig. 4, in this embodiment, the flow meter has an upstream pipe joint for connecting an upstream fluid pipe and a downstream pipe joint for connecting a downstream fluid pipe, the upstream pipe joint and the axis of the downstream pipe joint are located on the same central axis, and the sensor assembly is mounted in the housing of the flow meter and includes a vibrating portion and a non-vibrating portion partitioned by a vibration isolation structure, the vibration isolation structure includes at least a first vibration isolator that partitions the fluid flow pipe into a vibrating pipe and a non-vibrating pipe, and the first vibration isolator is disposed near the central axis. The first vibration isolation piece is located above the central axis, and the vertical distance between the first vibration isolation piece and the central axis is 0-20mm. Further preferably, the vertical distance between the first vibration isolation member and the central axis is 0-10mm. As a preferred embodiment of the present invention, the distance between the first vibration isolator and the central axis in this embodiment is 5mm, but the present invention is not limited to 5mm, and may be 0mm, 1mm, 3mm, 6mm, 10mm, 15mm, or 20mm in other embodiments. It should be noted that the first vibration isolator of the present invention may also be located above the central axis, as shown in fig. 3. The first vibration isolation piece is arranged close to the central axis, so that the distance from the first vibration isolation piece to the central axis of the upstream and downstream pipeline joint is short, and if the vibration part is discharged outside due to vibration, the distance from the exciting force formed on the vibration isolation piece to the axis of the upstream and downstream connecting position is also short, and rotation caused by the eccentricity of the exciting force can be avoided.
In this embodiment, the center of gravity of the sensor assembly is located substantially on the central axis. By locating the center of gravity of the sensor assembly substantially on this central axis, the radius of gyration of the sensor about the axis of the upstream and downstream connection locations is reduced as the center of gravity of the sensor assembly is as close as possible to or on the central axis of the upstream and downstream pipe joints when vibration leakage occurs in the vibrating portion. Therefore, no matter what reason the vibration part of the sensor is out of the way, the vibration of the non-vibration part of the whole sensor is difficult to be caused, and the stability of the flowmeter is improved.
Further, the difference in moment between the vibrating portion and the non-vibrating portion with respect to the horizontal line where the first vibration isolator is located is 0 to 20% of the moment value from the vibrating portion to the horizontal line. Through this kind of setting for if vibrating portion takes place the vibration and leaks, because vibrating portion and non-vibrating portion are less with the moment difference of the horizontal line of first vibration isolation member, can offset basically, be favorable to improving the stability of flowmeter.
Preferably, the difference in moment between the vibrating portion and the non-vibrating portion with respect to the horizontal line on which the first vibration isolator is located is 0.
The foregoing is a core technical solution of the present invention, and each portion of the coriolis mass flowmeter of the present embodiment will be described in detail below with reference to the accompanying drawings.
First, the fluid flow tube 4 of the present embodiment will be described.
As shown in fig. 3, the fluid flow tube 4 of the present embodiment has a fluid input line 41 for connecting with the upstream line connector 1 to receive a fluid material, a fluid output line 42 for connecting with the downstream line connector to output a fluid material, and a double 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 of the present embodiment 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 of the present embodiment 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 requirements of the coriolis mass flowmeter for the technical field where the split structure cannot be provided, such as the sanitary coriolis mass flowmeter. Since the fluid flow tube 4 has no flow dividing structure, it is not necessary to perform the welding operation of the flow dividing structure, and therefore the fluid flow tube 4 of the present embodiment is easier to perform welding and the required welding operation can be reduced as compared with the double tube type fluid flow tube 4 having the flow dividing structure in the related art.
As shown in fig. 4, the two ends of the fluid flow tube 4 are respectively connected with the upstream pipeline joint 1 and the downstream pipeline joint 2, and the specific structure thereof is that the fluid flow tube sequentially comprises a fluid input pipeline 41, a dual loop pipeline connected in series and a fluid output pipeline 42 from the upstream pipeline joint 1 to the downstream pipeline 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.
As shown in fig. 4, in the present embodiment, the fluid flow tube 4 is mounted with a vibration isolation structure, which is divided into a vibration pipe 47 above the vibration isolation structure and a non-vibration pipe 48 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, as shown in fig. 3, the fluid input pipe 41 of the fluid flow tube 4 of the present embodiment is provided with a substantially "S" -shaped rectifying pipe between the fluid input end and the first connection end, and the "S" -shaped rectifying pipe includes a first curved arc 412 and a second curved arc 413 which are curved 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 present embodiment achieves rectifying of the fluid entering the vibration pipe 47 by providing an "S" -shaped rectifying pipe on the fluid input pipe 41, so that the flow velocity field entering the vibration pipe 47 is more uniform, which is advantageous in improving the measurement performance of the vibration pipe 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 this embodiment, 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 present embodiment realizes the rectifying effect entirely by the curved 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 line 41 of the present embodiment further includes a horizontal input pipe section 411 connected to an upstream fluid pipe, and the fluid output line 42 further includes a horizontal output pipe section 421 connected to a downstream fluid pipe, and 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 this embodiment, 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.
Next, the weighting structure 7 of the present embodiment will be described.
As shown in fig. 4, the weight increasing structure 7 of the present embodiment is a weight block fixedly installed on the non-vibrating pipeline 48, and the weight block is made of one of stainless steel, hastelloy, titanium alloy, and spheroidal graphite cast iron. Preferably, the weight is the same as the material of the fluid flow tube 4, and is fixed by welding. The welding mode can be one of brazing or argon arc welding.
In this embodiment, specifically, the balancing weight is a hanging bracket 71 horizontally erected on the non-vibrating pipeline 48, and the hanging bracket 71 is symmetrically arranged on the left and right in the horizontal direction of the non-vibrating pipeline 48, specifically, since the fluid flow tube 4 in this embodiment is a dual-loop pipeline, the left end of the hanging bracket 71 is fixedly connected with the non-vibrating pipelines 48 of the first loop and the second loop at the left end, and the right end of the hanging bracket 71 is fixedly connected with the non-vibrating pipelines 48 of the first loop and the second loop at the right end. Through the setting of balancing weight, increased the weight of the non-vibrating part of sensor assembly, this is favorable to the isolation of the vibrating part of sensor assembly and non-vibrating part, is favorable to improving the measurement performance of sensor assembly, obtains stable zero point. The balancing weight is simple in structure, easy to process and low in cost, that is, the metering performance is greatly improved by additionally arranging the balancing weight, and the added cost is small, so that the balancing weight is beneficial to market popularization and mass production.
In this embodiment, the suspension 71 is a rectangular block having a certain thickness, and the minimum length-width dimension of the rectangular block is consistent with the length-width dimension of the space formed by the outer edge of the non-vibrating conduit 48. That is, the minimum length dimension of the rectangular block cannot be smaller than the spacing of the outermost ends of the non-vibrating ducts 48 on the left and right sides, nor the minimum width dimension of the rectangular block cannot be smaller than the spacing of the outermost ends of the front and rear non-vibrating ducts 48 on the same side. When the service temperature of the coriolis mass flowmeter is high, if the heat capacities of the hanging bracket 71 and the fluid flow tube 4 are not consistent, deformation stress is directly generated between the hanging bracket 71 and the fluid flow tube 4, so that the performance is affected; while the present embodiment is configured such that the heat capacity of the hanging drag 71 is substantially identical to the heat capacity of the fluid flow tube 4, thereby ensuring the performance.
As a preferred embodiment of the present invention, the rectangular block has a thickness equal to the outer diameter of a single non-vibrating conduit 48. The invention is not limited to equality and in other embodiments the rectangular block may also have a thickness of 0.5, 0.8, 1.2, or 1.5 times the outer tube diameter of the single non-vibrating tube 48.
In this embodiment, the suspension 71 is disposed on the non-vibrating pipe 48 away from the root of the vibrating pipe 47, and by analysis of vibration isolation theory, the further the suspension 71 is from the root of the vibrating pipe 47 on the non-vibrating pipe 48, the smaller the mass of the suspension 71 is, and the less material is used. Specifically, in the present embodiment, the suspension 71 is located on the non-vibrating pipe 48 at a distance of 50% of the vertical extension length of the non-vibrating pipe 48 from the root of the vibrating pipe 47. But the invention is not limited to 50% and in other embodiments the suspension 71 is spaced from the root of the vibratory pipe 47 on the non-vibratory pipe 48 by 30% or 40% or 45% of the vertical extension of the non-vibratory pipe 48.
As shown in fig. 7, the hanging drag 71 is disposed symmetrically in the horizontal direction with respect to the fluid flow tube 4. According to the flow direction of the fluid material in the fluid flow tube 4, the hanging bracket 71 is provided with a first through hole 711, a second through hole 712 and a third through hole 713 for the first loop to pass through, and a fourth through hole 714, a fifth through hole 715 and a sixth through hole 716 for the second loop to pass through, wherein the second through hole 712 and the third through hole 713 of the first loop are arranged on the left side and the right side of the rear end edge of the hanging bracket 71 and symmetrically arranged, the fourth through hole 714 and the fifth through hole 715 of the second loop are arranged on the left side and the right side of the front end edge of the hanging bracket 71 and symmetrically arranged, and the first through hole 711 of the first loop and the sixth through hole 716 of the second loop are positioned between other through holes and symmetrically arranged on the left side and the right side. The sensor component is of a symmetrical structure, so that better metering performance can be obtained.
In the embodiment, the gravity center of the sensor assembly is adjusted by arranging the weight increasing structure 7 on the non-vibrating pipeline, so that the vibrating state is improved, and the vibration coupling between the non-vibrating pipeline and the vibrating pipeline is reduced; and the weighting structure 7 and the non-vibrating pipeline 48 thereof are not contacted with the shell of the coriolis mass flowmeter, so that the non-vibrating part of the sensor assembly is in non-rigid connection with the shell of the flowmeter, which is beneficial to improving vibration isolation effect and obtaining stable zero point and excellent metering performance of the flowmeter.
In the present embodiment, the fluid input line 41 and the fluid output line 42 of the fluid flow tube 4 are welded to the upstream pipe joint and the downstream pipe joint, respectively, to achieve the fixation of the fluid flow tube.
As a modification of the weighting structure 7 of the present embodiment, as shown in fig. 5, the balancing weights may be in a split structure, that is, a sub-balancing weight 72 is disposed on each of the non-vibrating pipelines 48 on the left and right sides, and the sub-balancing weights 72 are fixedly mounted on two non-vibrating pipelines 48 on the same side and symmetrically disposed with respect to the two non-vibrating pipelines 48; the two sub-weights 72 located on different sides are symmetrically arranged in the horizontal direction of the non-vibrating conduit 48.
As a modification of the weighting structure 7 of the present embodiment, as shown in fig. 6, the weighting structure 7 may also achieve weighting by means other than a counterweight, for example, the weighting structure 7 is an extension pipe in which the non-vibrating pipe 48 extends in a direction opposite to the vibrating pipe 47. The effect of weighting the non-vibrating portion of the sensor assembly can also be achieved by extension of the non-vibrating conduit 48.
The vibration isolation structure of the present embodiment will be described.
As shown in fig. 3 to 6, the vibration isolation structure includes a first vibration isolation member 5 welded to the fluid flow tube 4 to separate the fluid flow tube 4 into a vibration pipe 47 and a non-vibration pipe 48, and a second vibration isolation member 6 positioned below the first vibration isolation member 5, the first vibration isolation member 5 and the second vibration isolation member 6 are each a sheet structure provided with a through hole through which the fluid flow tube 4 passes, and the first vibration isolation member 5 and the second vibration isolation member 6 are welded to the fluid flow tube 4 through the through holes.
The fixing connection between the first vibration isolation sheet and the second vibration isolation sheet and the fluid flow tube 4 is not limited to welding, and may be fixed by mechanical connection.
The number of vibration insulators is not limited to two either, and in other embodiments, a third vibration insulator or even a fourth vibration insulator may be provided below the second vibration insulator 6.
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 (15)
1. A sensor assembly for a coriolis mass flowmeter, wherein said flowmeter has an upstream conduit coupling for coupling to an upstream fluid conduit and a downstream conduit coupling for coupling to a downstream fluid conduit, said upstream conduit coupling and said downstream conduit coupling being on a common centerline, said sensor assembly being mounted within a housing of said flowmeter and comprising a vibrating portion and a non-vibrating portion separated by a vibration isolation structure, said vibration isolation structure comprising at least a first vibration isolator separating a fluid flow conduit into a vibrating conduit and a non-vibrating conduit, said first vibration isolator disposed proximate said centerline; the sensor assembly includes:
the fluid flow tube is provided with a fluid input pipeline and a fluid output pipeline and a double loop pipeline connected in series between the fluid input pipeline and the fluid output pipeline; the double loop pipeline is divided into a vibrating pipeline and a non-vibrating pipeline through the vibration isolation structure;
the excitation device is arranged on the vibrating pipeline and used for driving the vibrating pipeline to vibrate;
the detection device is arranged on the vibrating pipeline and is used for detecting the relative speed of the vibrating pipeline;
the weight increasing structure is arranged on the non-vibrating pipeline;
the excitation device, the vibration pipeline and the detection device form the vibration part; the weight increasing structure and the non-vibrating pipeline form the non-vibrating part;
the double loop pipeline comprises a first loop connected with the fluid input pipeline and a second loop connected with the fluid output pipeline, the plane of the first loop is parallel to the plane of the second loop, and the first loop is connected with the second loop through a bridging pipeline;
the excitation device comprises driving coils arranged at the middle parts of two loops of the vibration pipeline; and/or the detection means comprise a first detection sensor and a second detection sensor arranged at respective corners of the topside portions of the two loops of the vibrating conduit.
2. The sensor assembly for a coriolis mass flowmeter of claim 1 wherein said first vibration isolator is located above or below said central axis and is spaced from said central axis by a vertical distance of 0-20mm.
3. The sensor assembly for a coriolis mass flowmeter of claim 2 characterized in that said first vibration isolator is spaced from said central axis by a vertical distance of 0-10mm.
4. The sensor assembly of claim 1, wherein a torque difference between the vibrating portion and the non-vibrating portion relative to the central axis is 0-20% of a torque value of the vibrating portion to the central axis.
5. The sensor assembly of claim 4, wherein the difference in torque between the vibrating portion and the non-vibrating portion relative to a horizontal line at which the first vibration isolator is located is 0.
6. The sensor assembly of claim 1, wherein the weighting structure is a counterweight fixedly mounted on the non-vibrating conduit.
7. The sensor assembly of claim 6, wherein the fluid flow tube is one of stainless steel, hastelloy, and titanium alloy; and/or the balancing weight is made of one of stainless steel, hastelloy, titanium alloy and spheroidal graphite cast iron.
8. The sensor assembly of claim 6, wherein the weight is located on the non-vibrating conduit from the root of the vibrating conduit between 30% and 50% of the vertical extension of the non-vibrating conduit.
9. The sensor assembly of claim 6, wherein the weight is a suspension horizontally mounted on the non-vibrating conduit, and the suspension is symmetrically disposed in a horizontal direction of the non-vibrating conduit.
10. The sensor assembly of claim 9, wherein the suspension is a rectangular block having a thickness.
11. The sensor assembly of claim 10, wherein the rectangular block has a minimum length to width dimension that corresponds to a dimension of a space formed by the non-vibrating conduit outer edge.
12. The sensor assembly of claim 10, wherein the rectangular block has a thickness of 0.5-1.5 times the individual tube outer diameter of the non-vibrating tube.
13. The sensor assembly of claim 12, wherein the rectangular block has a thickness of 1 times the individual tube outer diameter of the non-vibrating tube.
14. The sensor assembly of claim 9, wherein the suspension is provided with a first through hole, a second through hole and a third through hole through which the first loop passes, and a fourth through hole, a fifth through hole and a sixth through hole through which the second loop passes, according to the flow direction of the fluid material in the fluid flow tube, wherein the second through hole and the third through hole of the first loop are disposed on the left and right sides of the rear end edge of the suspension and symmetrically disposed, the fourth through hole and the fifth through hole of the second loop are disposed on the left and right sides of the front end edge of the suspension and symmetrically disposed, and the first through hole of the first loop and the sixth through hole of the second loop are disposed between the other through holes and symmetrically disposed on the left and right sides.
15. A coriolis mass flowmeter comprising:
a housing;
a sensor assembly mounted inside the housing;
characterized in that the sensor assembly is a sensor assembly according to any one of claims 1-14.
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| CN201710748980.7A CN109425399B (en) | 2017-08-25 | 2017-08-25 | Coriolis mass flowmeter and sensor assembly therefor |
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| CN201710748980.7A CN109425399B (en) | 2017-08-25 | 2017-08-25 | Coriolis mass flowmeter and sensor assembly therefor |
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| CN109425399A (en) | 2019-03-05 |
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