CN2356327Y - Arrow shape vibrative tube for keshili guality flow meter - Google Patents

Abstract

The utility model relates to fluid measuring instruments, particularly a vibrative tube of a Coriolis mass flow meter. The utility model aims to solve the problems of low sensitivity, poor ability of resisting the interference of the ambient vibration in the already present vibrative tubes. The vibrative tube forms a curved arrow outline shape; the top is provided with a circular arc tube segment JK; both ends of the circular arc tube segment are respectively communicated with an oblique tube segment IJ, a circular arc tube segment HI, a circular tube segment GH, a straight tube segment FG, an oblique tube segment KB, a circular arc tube segment BC, a circular arc tube segment CD and a straight tube segment DE. The sensitivity can enhance from 20 percents to 30 percents; the ability of resisting the interference of the ambient vibration is strong; the metering range is wide. The utility model is suitable to manufacture the Coriolis mass flow meter.

Description

The arrowhead-shaped vibrating tube of Coriolis flowmeter

The utility model relates to the vibrating tube of the surveying instrument of fluid, particularly Coriolis flowmeter.

Coriolis force (Coriolis Force is called for short coriolis force) mass flowmeter is the mass rate that the coriolis force that produces when utilizing fluid to flow through vibrating tube is measured fluid.This flowmeter is not subjected to the influence of fluid states such as fluid temperature (F.T.), pressure, viscosity, electric conductivity, can measure pasty state, pulpous state and heterogeneous turbulent fluid.The Coriolis meter is made of mass flow sensor and joining mass flowmeter transmitter thereof, and mass flow sensor is made of vibrating tube and torquer, speed pickup, temperature sensor mounted thereto.Wherein vibrating tube has bending pipe and straight shape pipe, single tube and two-tube; In the bending pipe, U type vibrating tube, the ringwise ring-like vibrating tube that takes the shape of the letter U, the Ω type vibrating tube that is Ω shape, T-shaped T type vibrating tube or the like are arranged.Wherein, though U type vibrating tube manufacturing process is simple, the working band broad, the coriolis force usage factor is higher, and dynamical mechanical magnification is little, how much enlargement factors are little.Though ring-like vibrating tube dynamical mechanical magnification height exists unnecessary and unwanted transverse vibration.The dynamical mechanical magnification of T type vibrating tube is higher, how much enlargement factors are bigger, and down, manufacturability is general in the coriolis force usage factor.

Given this, the purpose of this utility model is to provide a kind of higher sensitivity that has, and anti-extraneous vibration interference capability is strong, and the coriolis force usage factor is than the arrowhead-shaped vibrating tube of the high Coriolis flowmeter of T type vibrating tube.

The utility model employing is designed to crooked arrow outer contour shape with vibrating tube and realizes its purpose.

The arrowhead-shaped vibrating tube of Coriolis flowmeter of the present utility model comprises the vibrating tube (1,2) that two ends can be communicated with arrival manifold (6) and outlet header (7) respectively, and above-mentioned vibrating tube is crooked arrow foreign steamer profile.

The top of above-mentioned vibrating tube is circular arc pipeline section (JK), the two ends of this circular arc pipeline section are communicated with inclined tube section (IJ), circular arc pipeline section (HI), circular arc pipeline section (GH), straight length (FG) and inclined tube section (KB), circular arc pipeline section (BC), circular arc pipeline section (CD), straight length (DE) respectively successively.

The left and right sides halves of above-mentioned vibrating tube is symmetrical structure with respect to the center line (mm) of the mid point of crossing circular arc pipeline section (JK), and above-mentioned inclined tube section (IJ) is α with the angle of inclined tube section (KB) ₁, the arc length of above-mentioned circular arc pipeline section (JK) is $\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="Y9824989100101.png"\; state="\{\{state\}\}">R</figure-callout>}1\&bull;\frac{{\mathrm{\&alpha;}}_1}{2},$ Above-mentioned inclined tube section (IJ), inclined tube section (KB) and the center of circle of crossing circular arc pipeline section (HI) and circular arc pipeline section (BC) (O ', the horizontal line (MM) of O ") becomes α ₃Angle, its length is $\frac{R2(1+\mathrm{sim}{\mathrm{\&alpha;}}_3-{\cos }^2{\mathrm{\&alpha;}}_3)}{\sin {\mathrm{\&alpha;}}_3\&bull;\cos {\mathrm{\&alpha;}}_3}+\frac{b}{2\cos {\mathrm{\&alpha;}}_3}-\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="Y9824989100101.png"\; state="\{\{state\}\}">R</figure-callout>}1\mathrm{tg}\frac{{\mathrm{\&alpha;}}_1}{4},$ Above-mentioned circular arc pipeline section (HI), the arc length of circular arc pipeline section (BC) are $\&lsqb;\frac{\mathrm{\&pi;}}{2}+\left(\frac{\mathrm{\&pi;}}{2}{-\mathrm{\&alpha;}}_3\right)\&rsqb;R2=(\mathrm{\&pi;}-{\mathrm{\&alpha;}}_3)R2,$ Above-mentioned circular arc pipeline section (GH), the arc length of circular arc pipeline section (CD) are $\frac{\mathrm{\&pi;R}2}{2},$ The length of above-mentioned straight length (FG), straight length (DE) is h, above-mentioned α ₃With α ₃The pass be ${\mathrm{\&alpha;}}_3+\frac{{\mathrm{\&alpha;}}_1}{2}=\frac{\mathrm{\&pi;}}{2}$ 。

Two vibrating tube (1,2) are are installed in parallel to each other on the pedestal (15), torquer (5) is arranged, become α with horizontal line (MM) at the central point (O) of vibrating tube at the mid point (A) of two vibrating tube ₂The intersection point (O, P) of lead-in wire at angle (ON, OP) and inclined tube section (IJ) and inclined tube section (BK), each speed sensor (3,4), the root of two vibrating tube has stop block (9) and temperature sensor (10), and its straight length (FG) and straight length (DE) are communicated with the arrival manifold (6) and the outlet header (7) of pedestal respectively.

The arrow-shaped structure of the utility model vibrating tube, wherein, the inclined tube section of top two symmetries (IJ, BK), for T type vibrating tube, it can improve the usage factor of coriolis force, and all the other each arc sections then are direction of flow and to reduce flow resistance required for a change.Through experiment confirm, the vibrating tube of this shape can improve coriolis force usage factor, dynamically enlargement factor and how much enlargement factors, and it is higher therefore to have the sensitivity that twisting vibration is measured, and anti-extraneous vibration interference capability is strong, the advantage of range ability broad.Compare with U type vibrating tube, when natural frequency was identical, its sensitivity can improve 20～30%.

The utility model is applicable to the making Coriolis flowmeter.

Below, the utility model is further described to use embodiment and accompanying drawing thereof again.

Brief description of drawings.

Fig. 1 is the structural representation of a kind of Coriolis flowmeter of the present utility model with arrowhead-shaped vibrating tube.

Fig. 2 is the structural representation with the mass flow sensor of this arrowhead-shaped vibrating tube formation.

Fig. 3 is the mm cut-open view of Fig. 2.

Fig. 4 is the structural representation with the arrowhead-shaped vibrating tube Coriolis flowmeter of this arrowhead-shaped vibrating tube formation.

Embodiment 1

The arrowhead-shaped vibrating tube of a kind of Coriolis flowmeter of the present utility model, as shown in drawings.Be crooked arrow foreign steamer profile structure.

The left and right sides halves of above-mentioned vibrating tube is symmetrical structure with respect to the center line mm of the mid point of crossing circular arc pipeline section JK, the top is circular arc pipeline section JK, the two ends of this circular arc pipeline section are communicated with inclined tube section IJ, circular arc pipeline section HI, circular arc pipeline section GH, straight length FG and inclined tube section KB, circular arc pipeline section BC, circular arc pipeline section CD, straight length DE respectively successively.In this embodiment, α ₁=120 °, α ₂=30 °, α ₃=30 °, R1=42 millimeter, R2=30 millimeter, h=60 millimeter, b=40 millimeter.

Above-mentioned circular arc pipeline section JK, its arc length is

In the formula, α ₁It is the angle of inclined tube section IJ and inclined tube section KB.

Above-mentioned inclined tube section IJ, inclined tube section KB are with the center of circle O ', the O that cross circular arc pipeline section HI and circular arc pipeline section BC " horizontal line M M become α ₃Angle, its length is $\frac{R2(1+\mathrm{sim}{\mathrm{\&alpha;}}_3-{\cos }^2{\mathrm{\&alpha;}}_3)}{\sin {\mathrm{\&alpha;}}_3\&bull;\cos {\mathrm{\&alpha;}}_3}+\frac{b}{2\cos {\mathrm{\&alpha;}}_3}-\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="Y9824989100101.png"\; state="\{\{state\}\}">R</figure-callout>}1\mathrm{tg}\frac{{\mathrm{\&alpha;}}_1}{4},$

=50.9 millimeters,

Above-mentioned circular arc pipeline section HI, the arc length of circular arc pipeline section BC are

Above-mentioned circular arc pipeline section GH, the arc length of circular arc pipeline section CD are

Above-mentioned straight length FG, the length of straight length DE are the h=60 millimeter,

Above-mentioned α ₁With α ₃The pass be ${\mathrm{\&alpha;}}_3+\frac{{\mathrm{\&alpha;}}_1}{2}=\frac{\mathrm{\&pi;}}{2}$ 。

To be two basic vibrating tube 1 and vibrating tube 2 of arrowhead form, being is parallel to each other is packed on the pedestal 15, and the straight length FG and the straight length DE of the root of two vibrating tube is communicated with the arrival manifold 6 and 7 welding of outlet header of pedestal respectively.Weld together with stop block 9 again in vibrating tube root h ' eminence.Mid point A two vibrating tube is welded with support 11, becomes α at the central point O of vibrating tube with horizontal line MM ₂The lead-in wire ON at=30 ° of angles and lead-in wire OP respectively are welded with support 11 with intersection point N point and the P point of inclined tube section IJ and inclined tube section BK respectively.On the support 11 that A is ordered, torquer 5 is installed, on the support 11 that N, P are ordered, the speed pickup 3 of left part and the speed pickup 4 of right part respectively are installed, torquer 5 is the angular oscillations that make two arrowhead-shaped vibrating tube carry out self-excitation around the baseline nn of stop block 9, and the speed pickup the 3, the 4th of two symmetries is used for measuring the phase differential of arrowhead-shaped vibrating tube around the twisting vibration of center line mm axle.Torquer and two speed pickups are common structure, all are made up of column permanent magnet 12 and coil 13.1,2, two speed pickups 3,4 of two above-mentioned vibrating tube, torquer 5 grades all are sealed in the inert gas filled stainless steel casing (not shown).At the motionless root of vibrating tube, the temperature sensor 10 of platinum resistance formula also is installed, be used for the temperature of measuring vibrations tube fluid medium.Thereby constitute mass flow sensor 14.

Above-mentioned mass flow sensor 14 usefulness usual ways and cable 16 and common mass flowmeter transmitter 17 are linked, constitute arrowhead-shaped vibrating tube mass flowmeter.

When convection cell is measured, after measured fluid flows into arrival manifold 6, be divided into two-way and enter this vibrating tube 1, vibrating tube 2 from two vibrating tube straight length FG port separately, flow through successively behind circular arc pipeline section GH, circular arc pipeline section HI, inclined tube section IJ, circular arc pipeline section JK, inclined tube section KB, circular arc pipeline section BC, circular arc pipeline section CD, the straight length DC, converge by outlet header 7 and flow out.Measure when fluid is flowed through vibrating tube, when vibrating tube is a around the angle speed of nn shaft vibration, the flow rate of fluid degree is v in the vibrating tube, and then coriolis force is that (in the formula of a * v), m is the quality of detected fluid to F=2m.Because the effect of coriolis force, make this vibrating tube carrying out the inphase angle vibration around the nn axle when, generation is around the twisting vibration of mm axle, the phase differential the when speed pickup 3,4 of left and right portion just can be measured and make vibrating tube top section left part and right part motion because of twisting vibration.With the signal of any one speed pickup, the amplifier in the mass flowmeter transmitter is input in the coil of torquer 5, produces the electromagnetic force of an alternation, makes vibrating tube carry out autovibration under the natural frequency of one first order mode.Measured data are handled through the mass flowmeter transmitter, obtained the mass rate of fluid.

Arrowhead-shaped vibrating tube as described below, that the utility model adopted is not limited only to the foregoing description.

Claims (4)

1, the arrowhead-shaped vibrating tube of Coriolis flowmeter comprises the vibrating tube (1,2) that two ends can be communicated with arrival manifold (6) and outlet header (7) respectively, it is characterized in that above-mentioned vibrating tube is crooked arrow foreign steamer profile.

2, the arrowhead-shaped vibrating tube of Coriolis flowmeter according to claim 1, the top that it is characterized in that said vibrating tube is circular arc pipeline section (JK), the two ends of this circular arc pipeline section are communicated with inclined tube section (IJ), circular arc pipeline section (HI), circular arc pipeline section (GH), straight length (FG) and inclined tube section (KB), circular arc pipeline section (BC), circular arc pipeline section (CD), straight length (DE) respectively successively.

3, the arrowhead-shaped vibrating tube of Coriolis flowmeter according to claim 2, the left and right sides halves that it is characterized in that vibrating tube is symmetrical structure with respect to the center line (mm) of the mid point of crossing circular arc pipeline section (JK), said inclined tube section (IJ) is α 1 with the angle of inclined tube section (KB), and the arc length of said circular arc pipeline section (JK) is $R1\&bull;\frac{{\mathrm{\&alpha;}}_1}{2},$ Said inclined tube section (IJ), inclined tube section (KB) and the center of circle of crossing circular arc pipeline section (HI) and circular arc pipeline section (BC) (O ', the horizontal line (MM) of O ") becomes α ₃Angle, its length is $\frac{R2(1+\mathrm{sim}{\mathrm{\&alpha;}}_3-{\cos }^2{\mathrm{\&alpha;}}_3)}{\sin {\mathrm{\&alpha;}}_3\&CenterDot;\cos {\mathrm{\&alpha;}}_3}+\frac{b}{2\cos {\mathrm{\&alpha;}}_3}-R1\mathrm{tg}\frac{{\mathrm{\&alpha;}}_1}{4},$ The arc length of said circular arc pipeline section (HI), circular arc pipeline section (BC) is (π-α ₃) R2, the arc length of said circular arc pipeline section (GH), circular arc pipeline section (CD) is $\frac{\mathrm{\&pi;R}2}{2},$ The length of said straight length (FG), straight length (DE) is h, above-mentioned α ₁With α ₃The pass be ${\mathrm{\&alpha;}}_3+\frac{{\mathrm{\&alpha;}}_1}{2}=\frac{\mathrm{\&pi;}}{2}$ 。

4, according to claim 1, the arrowhead-shaped vibrating tube of 2 or 3 described Coriolis flowmeters, it is characterized in that two vibrating tube (1,2) are and be installed in parallel to each other on the pedestal (15), mid point (A) two vibrating tube has torquer (5), becomes α at the central point (O) of vibrating tube with horizontal line (MM) ₂The intersection point (N, P) of lead-in wire at angle (ON, OP) and inclined tube section (IJ) and inclined tube section (BK), each speed sensor (3,4), the root of two vibrating tube have stop block (9) and temperature sensor (10).

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