CN203432630U - Vibration pipe and mass flow meter with the vibration pipes - Google Patents
Vibration pipe and mass flow meter with the vibration pipes Download PDFInfo
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- CN203432630U CN203432630U CN201320506183.5U CN201320506183U CN203432630U CN 203432630 U CN203432630 U CN 203432630U CN 201320506183 U CN201320506183 U CN 201320506183U CN 203432630 U CN203432630 U CN 203432630U
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- 230000005484 gravity Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 238000007598 dipping method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Abstract
The utility model discloses a vibration pipe and a mass flow meter with the vibration pipes. When media with different densities are used for detecting the same Coriolis mass flow meter, the metering error is small. The mass flow meter comprises a pair of vibration pipes which are the same and provided with balancing weights, wherein each vibration pipe comprises a top section and supporting sections which are symmetrically arranged at the two ends of the top section and connected with a base, the two balancing weights which are the same in weight are arranged on the outer wall of the top section, the two balancing weights are located on the two sides of the perpendicular bisector plane of the top section respectively, and the perpendicular distances between the gravity centers of the balancing weights and the perpendicular bisector plane of the top section are equal.
Description
Technical field
The utility model relates to a kind of vibrating tube and uses the coriolis mass flowmeters of this vibrating tube.
Background technology
Coriolis mass flowmeters is a kind of instrument of directly critically measuring fluid flow.Typical U-shaped coriolis mass flowmeters main structure body adopts two U-shaped pipes side by side, allows with same frequency and reversed-phase vibration under two Guan Qi resonant frequencies, and they can be drawn close simultaneously or open simultaneously.If in vibrating tube synchronous vibration, in fluid ingress pipe, make it along flowing forward in pipe, vibrating tube will force fluid to vibrate therewith.Fluid is in order to revolt this forced vibration, can be to reacting force vertical with its flow direction of vibrating tube, under this effect that is called Coriolis effect, vibrating tube will produce torsional deflection, entrance pipe and outlet section pipe can be variant at the time order and function of vibration, and it is poor that this is called phase time.This species diversity is directly proportional to the size that flows through the fluid mass flow of vibrating tube.If can detect the size of this time difference, the size of mass rate can be determined.Coriolis mass flowmeters is exactly to make according to above-mentioned principle.
Existing coriolis mass flowmeters has the following disadvantages: when the medium of different densities being detected with same coriolis mass flowmeters, there will be the inconsistent situation of error in dipping, and error amount is greater than calibration value.Namely the density of medium is larger on the testing result impact of coriolis mass flowmeters, and we are referred to as density effect.
In patent CN101014836A, the reason that density effect produces is mainly: what detect due to coriolis mass flowmeters is the torsional deflection that vibrating tube upstream and downstream part produces under corioliseffect, and this torsional deflection also can be produced by certain mode of oscillation of vibrating tube simultaneously, so, the actual torsional deflection amplitude the detecting composite function that to be coriolis force torsional deflection under driving frequency be out of shape with torsion vibration response.If these two frequencies approach, torsional amplitude is just large.Therefore,, in order to guarantee accuracy of detection, just should reduce as far as possible the possibility that vibrating tube produces twisting vibration.Yet when measured medium density changes, the driving frequency of vibrating tube and torsion frequency change and are inconsistent, may change the amplitude of torsional deflection, affect accuracy of detection.In essence, this theory is to be based upon under the not mobile prerequisite of measured medium, so it is upper that variable density is embodied in zero point to the impact of accuracy of detection, we can be referred to as Static Density effect.This patent proposes a kind of solution, two Y-direction balancing weights are set in vibrating tube both sides, and the size of these two Y-direction balancing weights and position are arranged so that this driver adds that the combination quality center of these two Y-direction balancing weights is located substantially on the X-Y plane at stream tube hub line place.What this technical scheme was emphasized is the distance of Y-direction, and namely balancing weight arranges highly.Above-mentioned X-Y plane is a longitudinal section of vibrating tube.
Mass flowmeter in above-mentioned patent has the following disadvantages: 1, balancing weight will guarantee after arranging that combination quality center is located substantially on the X-Y plane at stream tube hub line place, and this some difficulty in practical operation is larger, and the assembly precision needing is very high.2, from practical application, in the density that detects medium, change in situation, the testing result of above-mentioned mass flowmeter still can be a greater impact.This is because density effect is also relevant with instantaneous mass flow, when namely measured medium, in flow process, variable density occurs, also can affect accuracy of detection.Theoretical analysis is as follows: when measured medium flows, the coriolis force of its generation will make vibrating tube twist, and this torsional deflection makes measured medium form velocity gradient in the section of vibrating tube top, produce one around the torque of top section mid point, this torque forms feedback to torsional deflection, thereby affects accuracy of detection.Measured medium mass rate is larger, and torsional deflection is more obvious, and impact during variable density is just larger.Because this density effect is to produce in the situation that measured medium is mobile, so we are referred to as dynamic density effect.
Utility model content
The technical matters that the utility model solves is to provide a kind of vibrating tube, uses after this vibrating tube on coriolis mass flowmeters, and when the medium with different densities detects same coriolis mass flowmeters, error in dipping is less.
The utility model solves the technical scheme that its technical matters adopts: vibrating tube, comprise top section and the supporting section that is symmetricly set on section two ends, top, on the outer wall of top section, be provided with 2 balancing weights that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane of top section, and the vertical range of the vertical bisector plane of the centroidal distance top section of 2 balancing weights equates.
Further: described 2 balancing weights are arranged on the homonymy of top section.
Further: top section is rectilinear form.
Further: the outer wall of described top section comprises top, sidepiece and bottom, and described 2 balancing weights are arranged on the sidepiece of top section outer wall.
Further: described balancing weight is prismatic shape.
The utility model also provides a kind of mass flowmeter, comprises 2 identical above-mentioned vibrating tube, and described 2 vibrating tube are symmetrical arranged.The distinctive points of mass flowmeter of the present utility model and traditional coriolis mass flowmeters is just that the vibrating tube that the utility model is used is the above-mentioned vibrating tube with balancing weight of the present utility model.2 vibrating tube on this mass flowmeter are identical, make the set-up mode of 2 balancing weights in vibrating tube identical.Namely the weight of the balancing weight in each vibrating tube and position relationship are all identical, and 2 balancing weights in one of them vibrating tube and 2 balancing weights in another vibrating tube are Mirror Symmetry relation, as shown in Figure 2.An xsect at above-mentioned vertical bisector plane Shi Guodingduan center, as shown in Figure 1.By balancing weight, can produce torque, this torque can be used for weakening the harmful effect of the density of medium to testing result.Make error in dipping less.And, compare with the technical scheme of patent CN101014836A, because the application is based upon in the theoretical foundation of dynamic density effect, the actual detection case that more meets mass flowmeter, therefore, the application can further reduce error in dipping, and it is less that namely the application's mass flowmeter is subject to the impact that Media density changes when detecting.And above-mentioned balancing weight of the present utility model, when assembling, only needs the distance of the above-mentioned vertical scoring face of centroidal distance of consideration balancing weight, this point can be determined by simple measurement.Mass flowmeter assembling therefore of the present utility model is simple, efficient and convenient.
Further: the top section of described vibrating tube is rectilinear form.
Further: described 2 balancing weights are arranged on the homonymy of top section.
Further: the outer wall of described top section comprises top, sidepiece and bottom, and described 2 balancing weights are arranged on the sidepiece of top section outer wall.
Further: described balancing weight is prismatic shape.
The beneficial effects of the utility model are: when the medium with different densities detects same mass flowmeter, error in dipping is less.
Accompanying drawing explanation
Fig. 1 is provided with the schematic diagram of balancing weight in vibrating tube;
Fig. 2 is for being arranged on balancing weight the schematic diagram of outside portion of the outer wall of vibrating tube;
In figure, be labeled as: signal detector 1, supporting section 2, vertical bisector plane 3, balancing weight 4, top section 5, base 6, vibration isolation block 7, driver 8, top 51, bottom 52,53， inside portion, outside portion 54, sidepiece 55.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
As depicted in figs. 1 and 2, vibrating tube of the present utility model, comprise top section 5 and the supporting section 2 that is symmetricly set on section 5 two ends, top, on the outer wall of top section 5, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance top section 5 of 2 balancing weights equates.The utility model also provides a kind of mass flowmeter, comprises 2 identical above-mentioned vibrating tube, and described 2 vibrating tube are symmetrical arranged.As depicted in figs. 1 and 2, the set-up mode of the balancing weight in these 2 vibrating tube is identical.The above-mentioned balancing weight vertical distance of bisector plane 3 of 4 distance and the weight of balancing weight 4 can be set according to the actual conditions of mass flowmeter, by limited number of time, are tested and can be determined applicable design proposal.As shown in Figure 1, the xsect that above-mentioned vertical bisector plane 3 is top section 5, and top section 5 is divided equally, simultaneously vertical bisector plane 3 is also divided whole vibrating tube equally.This coriolis mass flowmeters of the present utility model is when the medium by different densities detects, and its error in dipping is less, and namely testing result is subject to the Effects of Density of medium less.
Above-mentioned vibrating tube can be various types of vibrating tube of applying in prior art, and top section 5 can be a circular arc, and supporting section 2 can be the rectilinear form vertically arranging.Can also be this vibrating tube as shown in Figure 1, the top section 5 of described vibrating tube be rectilinear form, is horizontally disposed with.In Fig. 1, the supporting section 2 of both sides is rectilinear form and vertically arranges, and between supporting section 2 and top section 5, is provided with arc transition section.Because top section 5 is rectilinear form, conveniently determine above-mentioned vertical bisector plane 3, and then facilitate the installation of above-mentioned balancing weight.On the other hand, proof, when the top section 5 of vibrating tube is rectilinear form, more remarkable to the minimizing of error in dipping by balancing weight is set by experiment.Namely the vibrating tube of this structure arranges after balancing weight in the manner described above, can make mass flowmeter when detecting, and the impact that is subject to Media density is very little.This point can be found out from following form:
At mistiming △ t=1x10
-6s, Media density ρ variation range 100～1000kg/m
3situation under, divide equally 5 sections and can obtain following error in dipping data:
As can be seen here, without balancing weight in the situation that, Media density is 1000kg/m
3and 200kg/m
3time, the difference of error e is-0.298%, and after being provided with balancing weight, namely uses this mass flowmeter of the present utility model, the difference of error e is-0.052%.As can be seen here, by being symmetrical arranged balancing weight, can significantly reduce the error in dipping of mass flowmeter under different medium density.Make when mass flowmeter is detected, the Effects of Density of examined medium less.
Above-mentioned balancing weight, when arranging, can be arranged on top 51, sidepiece 55 or the bottom 52 of the outer wall of top section 5.Specifically can determine flexibly according to the position of miscellaneous equipment, for example the driver 8 of Fig. 1 is arranged on the bottom of vibrating tube, in order to dodge, balancing weight can be arranged on to sidepiece 55.As shown in Figure 2, sidepiece 55 comprises namely two sides that vibrating tube deviates from mutually of 54， outside portion, 53He inside portion, outside portion 53, inside portion 54 namely two vibrating tube mutually towards a side.Balancing weight is arranged on to outside portion 53 and can be convenient to being connected of balancing weight and vibrating tube, be convenient to existing mass flowmeter to set up balancing weight.
2 balancing weights in same vibrating tube, when arranging, can one be arranged on 51, one, top and be arranged on bottom 52; Or one is arranged on 53, one of outside portions and is arranged on inside portion 54.Also can be as shown in Figure 1, described 2 balancing weights 4 are arranged on the homonymy of top section 5.Namely 2 balancing weights are all arranged on top 51, or are all arranged on bottom 52, or are all arranged on outside portion 53, or are all arranged on inside portion 54.Proof by experiment, the effect that 2 balancing weights are arranged on homonymy is than being arranged on the effective of homonymy not.
The shape of above-mentioned balancing weight 4 can be prismatic shape, square for example, rectangular parallelepiped etc.Convenient like this each balancing weight of installing, the also convenient center of gravity of determining balancing weight.Because balancing weight is regular shape, it is for example square, when balancing weight is installed, only need be using a face of the balancing weight of square shape as reference field, allow this reference field be arranged in parallel with the vertical bisector plane 3 of above-mentioned top section 5, the distance of the vertical bisector plane 3 of the centroidal distance of balancing weight can be converted into the distance of the vertical bisector plane 3 of this reference field distance, can be convenient to determine fast like this installation site of each balancing weight.
Embodiment mono-:
Mass flowmeter comprises two identical symmetrically arranged vibrating tube with balancing weight.Wherein, the set-up mode of balancing weight is as follows: on the outer wall of the top section 5 of each vibrating tube, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance of described 2 balancing weights top section 5 equates, the weight of balancing weight 4 is 0.03kg, balancing weight 4 is 0.03m apart from the vertical range of corresponding vertical bisector plane 3, and balancing weight is arranged on the top 51 of the outer wall of vibrating tube.
Embodiment bis-:
Mass flowmeter comprises two identical vibrating tube that are provided with balancing weight, on the outer wall of the top section 5 of each vibrating tube, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance of described 2 balancing weights top section 5 equates, the weight of balancing weight 4 is 0.05kg, balancing weight 4 is 0.06m apart from the vertical range of corresponding vertical bisector plane 3, and balancing weight is arranged on the bottom 52 of the outer wall of vibrating tube.
Embodiment tri-:
Mass flowmeter comprises two identical symmetrically arranged vibrating tube with balancing weight.Wherein, the set-up mode of balancing weight is as follows: on the outer wall of the top section 5 of each vibrating tube, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance of described 2 balancing weights top section 5 equates, the weight of balancing weight 4 is 0.04kg, balancing weight 4 is 0.04m apart from the vertical range of corresponding vertical bisector plane 3, and balancing weight is arranged on the outside portion 53 of the outer wall of vibrating tube.
Embodiment tetra-:
Mass flowmeter comprises two identical symmetrically arranged vibrating tube with balancing weight.Wherein, the set-up mode of balancing weight is as follows: on the outer wall of the top section 5 of each vibrating tube, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance of described 2 balancing weights top section 5 equates, the weight of balancing weight 4 is 0.04kg, balancing weight 4 is 0.04m apart from the vertical range of corresponding vertical bisector plane 3, and balancing weight is arranged on the bottom 52 of the outer wall of vibrating tube.
Embodiment five:
Mass flowmeter comprises two identical symmetrically arranged vibrating tube with balancing weight.Wherein, the set-up mode of balancing weight is as follows: on the outer wall of the top section 5 of each vibrating tube, be provided with 2 balancing weights 4 that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane 3 of top section 5, and the vertical range of the vertical bisector plane 3 of the centroidal distance of described 2 balancing weights top section 5 equates, the weight of balancing weight 4 is 0.04kg, balancing weight 4 is 0.04m apart from the vertical range of corresponding vertical bisector plane 3, in 2 balancing weights in same vibrating tube, one of them is arranged on the bottom 52 of the outer wall of vibrating tube, another is arranged on the top 51 of the outer wall of vibrating tube.
Embodiment six:
On the basis of above-mentioned any one embodiment, above-mentioned vibrating tube comprises the horizontally disposed top section of rectilinear form, and section two ends, top are connected with arc-shaped transition section, and the lower end of arc-shaped transition section is connected with the supporting section of the vertical setting of rectilinear form.
Claims (10)
1. vibrating tube, the supporting section (2) that comprises top section (5) and be symmetricly set on section (5) two ends, top, it is characterized in that: on the outer wall of top section (5), be provided with 2 balancing weights (4) that weight is identical, described 2 balancing weights lay respectively at the both sides of the vertical bisector plane (3) of top section (5), and the vertical range of the vertical bisector plane (3) of the centroidal distance top section (5) of 2 balancing weights equates.
2. vibrating tube as claimed in claim 1, is characterized in that: described 2 balancing weights (4) are arranged on the homonymy of top section (5).
3. vibrating tube as claimed in claim 1, is characterized in that: top section (5) is rectilinear form.
4. the vibrating tube as described in claim 1,2 or 3, is characterized in that: the outer wall of described top section (5) comprises top (51), sidepiece (55) and bottom (52), and described 2 balancing weights (4) are arranged on the sidepiece (55) of top section outer wall.
5. vibrating tube as claimed in claim 1, is characterized in that: described balancing weight (4) is prismatic shape.
6. mass flowmeter, is characterized in that: comprise 2 identical vibrating tube as claimed in claim 1, described 2 vibrating tube are symmetrical arranged.
7. mass flowmeter as claimed in claim 6, is characterized in that: the top section (5) of described vibrating tube is rectilinear form.
8. mass flowmeter as claimed in claim 6, is characterized in that: described 2 balancing weights (4) are arranged on the homonymy of top section (5).
9. the mass flowmeter as described in claim 6,7 or 8, is characterized in that: the outer wall of described top section (5) comprises top (51), sidepiece (55) and bottom (52), and described 2 balancing weights (4) are arranged on the sidepiece (55) of top section outer wall.
10. mass flowmeter as claimed in claim 6, is characterized in that: described balancing weight (4) is prismatic shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506183.5U CN203432630U (en) | 2013-08-19 | 2013-08-19 | Vibration pipe and mass flow meter with the vibration pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506183.5U CN203432630U (en) | 2013-08-19 | 2013-08-19 | Vibration pipe and mass flow meter with the vibration pipes |
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| Publication Number | Publication Date |
|---|---|
| CN203432630U true CN203432630U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320506183.5U Expired - Fee Related CN203432630U (en) | 2013-08-19 | 2013-08-19 | Vibration pipe and mass flow meter with the vibration pipes |
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| CN (1) | CN203432630U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398749A (en) * | 2013-08-19 | 2013-11-20 | 四川中测流量科技有限公司 | Vibrating tube and mass flow meter using vibrating tube |
| WO2021173132A1 (en) * | 2020-02-26 | 2021-09-02 | IDEX India PVT. LTD | Method and apparatus to balance a coriolis mass flow meter |
-
2013
- 2013-08-19 CN CN201320506183.5U patent/CN203432630U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398749A (en) * | 2013-08-19 | 2013-11-20 | 四川中测流量科技有限公司 | Vibrating tube and mass flow meter using vibrating tube |
| WO2021173132A1 (en) * | 2020-02-26 | 2021-09-02 | IDEX India PVT. LTD | Method and apparatus to balance a coriolis mass flow meter |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20210819 |
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| CF01 | Termination of patent right due to non-payment of annual fee |