JPH02501090A - Convection inertia flow meter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Convection inertia flow meter The flow meter of this invention is fixed to a rigid frame at two ends and has a loop a conduit providing a wave path containing However, they overlap.

Electromagnetic pipe rakes placed in overlapping sections of the conduit connect the two halves of the conduit. vibrate the beams laterally relative to each other and position them at the two fixed ends and the central section of the conduit. A conduit whose amplitude varies over the length of the conduit such that only the node at which it is placed has zero amplitude. causes bending vibration. 2] The fluid flowing in the pipe is affected by the above-mentioned bending vibration of this pipe. The convection inertia force generated by the width change is generated, and the convection inertia force is distributed along the length of the conduit. distribution is symmetric about the central section of the conduit, and this convective inertia The force produces bending vibrations in the conduit with symmetrical modes about the central section of the conduit. This bending vibration is generated by an electromagnetic piebreak in the central section of the conduit. It is superimposed on the bending vibration of the conduit, which has an asymmetric mode centered around the bend. flow through the conduit The mass flow rate (Cmass flowrate) of the fluid that You can find out by measuring the minutes. This measurement measures the bending vibration between the two halves of the conduit. or the amplitude of the bending vibration in the central section of the conduit. A mass flow meter that works on the same principle as described herein is a , may include a generally U-shaped conduit that causes two halves of the conduit to vibrate relative to each other.

In this case, one end of one of the two halves of the conduit is connected by a flexible joint or relative to each other. It has a pair of parallel conduits that vibrate, and one of each of the pair of conduits vibrates. The ends have flexible joints.

The priority of this invention is "Convective inertia flow meter" filed on July 27, 1987. U.S. Patent Application No. 071078206 and filed on March 7, 1988. Based on U.S. Patent Application No. 07/164,541 entitled "Convective Inertia" ing.

A wide variety of mass flowmeters known as Coriolis force flowmeters are It has appeared in the field of industrial flow measurement and has been welcomed by many users. In the view of the inventors of many of these, their working principles have been deeply and Invented and designed without precise understanding of the physics that govern its performance Failure to fully utilize principles and mathematical relationships.

A glaring example of a misconception about "Coriolis force flow meters" is that the name is also incorrect. Acceleration or deceleration of a fluid produces inertia or an associated dynamic reaction force. , opposes the acting force causing acceleration or deceleration. Information on fluid behavior According to Iller's explanation, the acceleration experienced by a moving fluid consists of local acceleration and convective acceleration. It is classified into two types. The inertia force associated with convective acceleration is called "convective inertia force." , which uses one or more vibrating conduits equal to the slope of the mass flow Franks density times the flow velocity. Any pjt flowmeter used is called a "Coriolis force flowmeter". Whether or not, the effect of convective inertia forces is measured to determine the fluid mass flow rate.

The first object of the invention is to use the simplest form of vibrating conduit, yet to The object of the present invention is to provide a flow meter having the greatest effect on performance. Therefore, this The quality of the invention is that the flow meter has a large flow rate magnification and high sensitivity.

Another purpose is to have approximately 3600 loops, with both ends secured to a rigid frame. It is an object of the present invention to provide a mass flow meter having a single conduit with a defined diameter. In this case, the conduit two sections of the conduit are adjacent to the two fixed ends of the conduit; forming 360° loops spaced apart and overlapping each other. are connected, and an electromagnetic vibrator moves the two sections of conduit in a relative lateral direction. make it vibrate. A mass flow rate is provided in each of the two sections of the conduit. Bending vibration of two sections of conduit measured by two motion detectors determined by the difference between the bending vibrations at nodes that correspond to the central section of the conduit that the vibration detector measures. Therefore, it is determined.

Another purpose is to include two 360 degree loops bending in two different directions. , a mass flow meter with a single conduit whose two ends are fixed to a rigid frame The goal is to provide the following. In this case, each adjacent the fixed end of the conduit, two Two conduit sections connected to each other by two 360° loops overlap each other and sandwich the central section of the conduit at intervals; The two conduit sections are vibrated laterally relative to each other by an electromagnetic pie-break. Added. Mass flow rate is determined by the difference in bending vibrations of two sections of conduit If there is no bending vibration, the center section of the conduit is determined by the bending vibration at the node that corresponds to the traction.

Yet another purpose is to provide a conduit route adjacent to each of the two fixed ends. comprising two sections of conduit connected to each other by a looped section , a mass flow needle with a single conduit whose two ends are fixed to a rigid frame The goal is to provide the following. In this case, the two sections are separated by isbybreak. vibration can be applied in a relative lateral direction. Mass flow rate is measured in the form of phase angle difference. determined by the difference in the bending vibrations of two sections of conduit, or If there is no fluid flowing through the conduit and no bending vibrations, then the node that corresponds to the central section of the conduit determined by bending vibration at .

Yet another purpose is to provide two fixed ends adjacent to each other and a 360° radius of the conduit. Contains two sections of conduit connected to each other by loops of A mass flow meter with a single conduit whose end is fixed to a rigid frame It is to provide. In this case, a portion of the 360° loop and two sections of conduit are One of the conduits is the point where the two halves of the conduit overlap with a space between them. symmetrical about the center and other parts of the 360 degree loop and the two sections of conduit. Other sections of the section are centered around the section where the conduits overlap. It has a symmetrical shape. t-magnetic bi-ops installed in sections where the conduits overlap. The break causes the two combinations of conduit sections to vibrate relative to each other.

quality! The flow rate is between two conduit sections included in one of two combinations of conduit sections. is determined by the difference in bending vibration of the conduit section between the two sections.

Another objective is that - the inlet and outlet legs installed in a straight line create two 360° loops. two 360° loops extending in two opposite directions approximately perpendicular to a plane parallel to the loop An object of the present invention is to provide a mass flow meter having the following features. Sexy with extended entrance and exit legs The electromagnetic pie break provided in the section opposite the The two 3600 loops are vibrated in pairs. 1x volume flow rate for inlet leg and outlet leg The section Σ extends between the section where the electromagnetic vibrator is installed Two sections each measured in two diametrically opposed sections It is determined by the difference in relative bending vibration between the two versions.

Another object is to provide a pair of conduit sets parallel to each other and connected in series with each other. The object of the present invention is to provide a mass flow needle having a large amount of force. In this case, two sections A flexible joint is installed at one end of each conduit, and an electromagnetic vibrator connects the two conduits. vibrate the sections relative to each other. The mass flow rate is determined by the curve between the two conduit sections. determined by the difference in vibration.

Yet another purpose is to connect common inlet and outlet legs arranged in parallel. A mass flow meter having a pair of parallel conduits is provided. In this case, two leads The two ends belonging to the tube and located at their opposite ends have flexible joints. two flats An electromagnetic piebreak located in the center section of a conduit assembly that Causes relative bending vibration. The mass flow rate is determined by the combination of two parallel conduits. is determined by the difference in relative bending vibration between the halves.

The above objects and other objects of this invention will become apparent as the description progresses. The invention will be explained more clearly and in detail by referring to the following drawings. can.

FIG. 1 shows the mass flow rate of the present invention with a single 360° loop section of conduit. FIG. 2 is a perspective view of one embodiment of the meter.

FIG. 2 shows the mass flow rate of the present invention with a single 3600 loop section of conduit. FIG. 3 is a perspective view of another embodiment of the meter.

Figure 3 shows the mode of primary bending vibration caused by an electromagnetic vibrator and the vibrating conductor. The mode of secondary bending vibration caused by the convective inertia of the fluid flowing through the pipe is shown.

Figure 4 shows the mass flow rate of the present invention with a single 360m loop section of conduit. Another embodiment of the meter is shown.

FIG. 5 shows the mass flow rate of the present invention with a single 360° loop section of conduit. Yet another embodiment of the meter is shown.

Figure 6 shows two 360'' loop sections of conduit bending in two opposite directions each. 1 shows an embodiment of a mass flowmeter of the present invention having a function of

Figure 7 shows two 3600 loop sections of conduit bending in two opposite directions each. 2 shows another embodiment of a mass flow needle of the present invention having a

FIG. 8 shows two 360'' loop sections of conduit configured like coiled springs. 2 shows yet another embodiment of the mass flowmeter of the present invention having the following functions.

FIG. 9 shows a single 360 degree loop of conduit constructed similar to the embodiment shown in FIG. 1 shows an embodiment of a mass flow meter of the present invention having a double section.

Figure 10 shows two parallel sections extending to the inlet leg and outlet layer respectively. shows an embodiment of the mass flow meter of the invention having two parallel sections of conduit. The sections are connected in series to each other by loop sections of conduit.

Figure 11 shows two parallel sections extending to the inlet leg and outlet layer respectively. 2 shows another embodiment of the mass flow meter of the present invention having the following structure.

In this case, two parallel sections of conduit are interconnected by a loop section of conduit. connected in series.

Figure 12 shows two sections of conduit extending to the inlet leg and outlet layer, respectively. 1 shows an embodiment of a mass flowmeter of the present invention having a mass flowmeter according to the present invention.

In this case, the two sections of conduit are extended to the inlet leg and outlet layer, respectively. 360'' of conduit comprising two sections of conduit arranged symmetrically with respect to each other. are connected to each other by loop sections.

Figure 13 shows a pair of parallel conduits connected to a common parallel inlet leg and outlet layer. illustrating an embodiment of the mass flow meter of the invention having, in this case, one of the two parallel conduits The first end of the conduit and the other end of the other of the two parallel conduits both have a flexible joint. ing.

FIG. 14 shows a mass flow needle of the present invention having a structure similar to the embodiment shown in FIG. Another example is shown below.

FIG. 15 shows two flexible joints arranged similarly to the embodiment shown in FIG. 13. 2 shows another embodiment of the mass flow meter of the present invention with parallel conduits.

FIG. two sections of conduit connected to the inlet leg and outlet layer by flexible joints respectively at 1 shows an embodiment of the mass flowmeter of the present invention having the following options.

Figure 17 shows parallel extensions from the inlet leg and outlet layer, respectively, with flexible joints. A mass flow meter of the invention having two sections of conduit connected to each other by Another example is shown below.

FIG. 1 shows two ends 2 and 3 connected to an inlet leg 4 and an outlet layer 5, respectively, and Example of a mass flow meter with a single conduit 1 fixed to a rigid frame 6 A perspective view is shown. This conduit is attached to the overhang with two fixed ends. Loop-shaped sections extending from 3 and having a loop angle of 360° or less having two substantially straight sections 7.8 connected to each other by a section 9; . a vibrader arranged in the intermediate plane between the two fixed ends 2 and 3 of the conduit 1; An electromagnetic piebreak 10 energized by a power source 11 connects two substantially straight sections of the conduit. vibrate the sections relative to each other. This bending vibration is at the resonant frequency of the vibration system. It vibrates. The mosies attached to substantially straight sections 7 and 8 of the conduit, respectively, Detectors 12 and 13 are secured to the center section of loop section 9 of the conduit. The bending vibrations of the conduit are measured by a third motion detector 14 which has been moved. Mo The signal emitted by the sensor 12.13.14 is passed through the filter amplifier by the line Sent to 15th. After these signals are adjusted by the filter amplifier 15, A data processor 16 that analyzes these signals and converts them into information regarding mass flow rates. sent to. The filter amplifier 15 pipes information regarding the numerical value of the resonant frequency. Send it to the lake power supply 11.

Figure 2 shows a single unit with its two ends 18,19 fixed to a rigid frame 20 Another embodiment of a mass flow meter having conduits 17 is shown, each conduit being parallel or A protruding overhang structure extending from the fixed end of the conduit 18. by a loop section 23 of the conduit with a loop angle of 360° or more and 720'' or less. It has two generally straight sections 21 connected to each other. Two abbreviations for conduit An electromagnetic vibrator placed in the mid-plane between straight and parallel sections 21.22 24 of the conduit connected to two parallel sections 21, 22 of the conduit, respectively. two half-breaks of the loop section 23, including the loop section 23 of the conduit; Vibrate relatively in a direction approximately perpendicular to the plane. Two substantially straight sections 21.2 2 and the loop section 23 of the conduit. measurement of the two half-break bending vibrations of the conduit 17 by means of motion detectors 25 and 26; . A motion detector 27 located in the central section of conduit 17 also 7. Measure the bending vibration. 1st. Motion detection used in the example shown in Figure 2 The detector may be a position, velocity or acceleration sensor; these sensors may be inductive, capacitive, Strain or stress sensors can be used.

The equation determining the bending vibration of a conduit containing a moving fluid can be written as:

EIa4v/θr + (+m + puA)2”V/at”+pu A　a''V/j3a　t　-0,(tl However, ■ is the bending speed of the conduit, and X is the conduit bending speed. linear coordinates specified according to the central axis of , t is time, E is the elastic modulus of the conduit wall, ■ is The moment of inertia of the cross section of the conduit, m is the linear density of the conduit, p is the fluid density, and U is the fluid density. The convective velocity, A, is the cross-sectional area of the conduit flow path.

This formula (11) applies to all sections except the section where the electromagnetic vibrator generates vibration force. Applies to sections. For simplicity, ends A and G are simply supported rather than fixedly supported. Conduit in the embodiment of FIG. 1 or FIG. 2 assuming only supported To analyze the solution of equation (1) that describes the bending vibration of two approximately straight sections of is beneficial. It is easy to see that such a solution can be written as Recognize.

V/V, = sinhλ(X/L) sinωt±(pUA#L”/4E1λ2)・ X5inhλ(X/L)cosa+t (2) However, vo is the maximum vibration of the bending speed. width, and the coordinate X is the fixed end of each of the two sections A-C and G-E of the conduit. where L is the length of conduit section A-C or G-E and ω is the bending vibration The plus or minus sign before the second term on the right side of equation (2), which is the angular frequency, is Applies to conduit sections A-C and G-E, respectively.

The positive direction of coordinate X is the same as the direction of flow U for the first conduit section A-C. and know that for the second conduit section G-H these are in opposite directions. That is useful. The parameter λ satisfies the characteristic equation.

(λ/L)4-ω2(-+ρυA)/ET-0(31The two in Fig. 1 By motion detector 12.13 or motion detector 25.26 of FIG. The sum and difference of the two bending vibrations measured respectively are expressed by the following formula.

(Σν) / Shiro = 2 sinhλ (J/L) sioa + t (41ΔV/ Vo = (1) DA ωL”/ 2 Elλ2)・1sinhλC1/L) cos ωt (5) where l is the X coordinate of the section where the motion detector is placed The sum of the outputs of the two motion detectors given by equation (4) is 2 represents the bending vibration of a conduit section containing a fluid and is given by equation (5). The difference between the outputs of the two motion detectors is a function of the fluid flow proportional to the mass flow rate (ρUA). Represents the influence of flow inertia.

The following relationship is obtained from the combination of the differences between equations (4) and (5).

(Σν)/V, -ΔV/Vo=sin (ω is one φ) (6) However, φ=jan-’ [(ρUA) ωL”1/4EIλ”] (7) Equation (7) The size of the term in [ ] on the right-hand side of is generally very small, so equation (7) is It can be approximated by the following formula.

φ=(ρDA)ωL” J/4 Elλt (8) Equation (η, (8) is The mass flow rate (ρUA) can be determined by the phase angle defined by equation (6).

In the actual calibration of a mass flow meter, the relationship between the mass flow rate (ρUA) and the phase angle φ is should be determined empirically.

FIG. 3 shows the displacement of the conduit over its entire length. However, the formula ( y, which corresponds to the first term on the right side of 2), is the displacement of the conduit containing the stationary fluid. 3'+, which corresponds to the second term on the right side of formula (2), is the convective habit of the moving fluid in the conduit. produced only by electromagnetic vibrators, exhibiting additional displacement of the conduit caused by magnetic forces. y, is asymmetrical about the central part of the conduit, i.e., the nodal section; yI caused by the moving convective inertia force is centered around the central part, that is, the nodal section D. It is important to know that it is symmetrical. Included in the mass flowmeter of this invention The vibrating conduit automatically vibrates at the natural frequency of the second harmonic instead of the first harmonic. Ru. This point is different from known types of mass flowmeters that use the natural frequency of the first harmonic. Different. Generally, the natural frequency of the second harmonic is twice the natural frequency of the first harmonic. be.

According to equations (7) and (8), the sensitivity of the mass flow meter is determined by the natural vibration of the conduit. directly proportional to the number. Therefore, the mass flow meter of the present invention has a conventional type of mass flow rate. It has overwhelmingly high sensitivity compared to a meter.

The yo caused only by electromagnetic pie-breaks occurs at the nodal section in the middle of the conduit. yl, which is caused by the convective inertia of the moving fluid, disappears, while yl, which is caused by the convective inertia of the moving fluid, is in the nodal section D It can be seen that the maximum value is reached at . Therefore, the bending vibration of node section D Since the width is proportional to the mass flow rate, the mass flow rate is Or determined by the amplitude of the output of the motion detector 27 shown in FIG. Can be done. The mass flow rate is determined by the two motion detectors 12.13 and 12.13 shown in Figure 1. 2 respectively measured by the two motion detectors 25 and 26 shown in Figure 2. It should also be pointed out that the difference in amplitude between the two bending vibrations If not, the mass flow rate is determined by the three different motion detectors 12.13.14. or 25.26.27 can be determined by combining all three different outputs. Wear.

Figure 4 shows a mass flowmeter that has approximately the same structure as the embodiment shown in Figure 1 and operates on the same principle. In this example, two generally straight sections 28 of the conduit are shown. ．． 29 relative bending vibrations occur in the two intermediate planes between the two fixed ends of the conduit. A pair of electromagnetic pipe rakes 30 and 31 are placed on opposite sides of the It will be done. The bending vibrations of the two substantially straight sections 28,29 of the R-tube are each measurement by motion detectors 32.33.

On the other hand, bending vibrations in the nodal or central section of the conduit can be detected by motion detection. measured by the instrument 34. In this and subsequent figures of the mass flow meter, the motor Electrical wires extending from the sensor have been omitted to simplify the diagram.

FIG. 5 shows a mass of a structure that is basically the same as the embodiment shown in FIG. 1 with one exception. The one exception to this is that the flow meter shows two generally straight sections of conduit 37. A pair of accelerometer-type motion detectors that measure the absolute velocity of 38 bending vibrations. 35.36. Motion detector 12.13 in Figure 1 and Figure 2 The motion detectors 25, 26 and 32, 33 in FIG. a substantially straight section to a looped end or to a looped section of conduit. Measuring the velocity of bending vibration of the tion.

Bending vibrations in the nodal or central section of the conduit are always accompanied by ) type of motion detector. That is, the embodiment of FIGS. 11 and 2 Motion detector 14.27 and motion detector respectively used in This is the case of 39.

The second figure shows a single rod with two ends 41, 42 fixed to a rigid frame 43. 2 is an example of a mass flow meter having a conduit 40; This c-X tube is installed using a cantilever beam. Extending from two fixed ends 41, 42 respectively and bending in two opposite directions Conduit loops with loop angles less than or equal to 360″″ with 12 loop sections two generally straight sections connected to each other by a section 44. It has 45. The central portion of the loop section 44 of the conduit is located between two generally straight lines of the conduit. It passes through the space between the straight sections 44, 45. two fixed ends of the conduit 4 The electromagnetic pipe rake 47 arranged in the intermediate plane between 1.42 and 42 vibrate section 44.45. A pair of motion detectors 48.49 are The bending vibrations of two substantially straight sections 44,45 are each measured. Figure 9 In another embodiment of a mass flow needle with a specially shaped conduit as shown in FIG. 9 may use a pair of electromagnetic pipe rakes instead of a motion detector, and is also required. Element 47 measures the bending vibration of a conduit at the nodal section, i.e. the central section of the conduit. There are two types of motion detectors in the embodiment shown in FIG. 2. It operates on the same principle as explained with respect to FIG.

In Figure 7, a single conduit with its two ends 51, 52 fixed to a rigid frame is shown. This conduit shows an example of a mass flow meter having a each extending from the two ends 51 , 52 of the conduit, each in two opposite directions. The loop section of the conduit has two 360° loop sections that bend. It has generally straight sections 53, 54 connected to each other. two fixed The tittt vibrator 56 is arranged in the intermediate plane between the ends 51 and 52. The two substantially straight sections 53,54 of the conduit are vibrated relative to each other. A pair of moss tion detectors 57,58 each detect two generally straight sections of conduit 50. Measure the bending vibration of 53.54. The mass flow rate is detected by two motion detectors 57. It is determined by the difference between two bending vibrations, each measured by 58. this The difference may be a difference in phase angle or a difference in amplitude, as shown in Figures 1, 4, 5, and 6. The two generally straight sections of conduit used in the example described above were used in the conduit loop section. The relative bending vibrations occur in that plane. It happens. On the other hand, the two substantially straight sections in the embodiment shown in FIG. placed in a plane approximately parallel to the loop section of the tube and vibrating relative to that plane do.

Figure 8 shows that the two ends 60, 61 are in line with each other and are attached to a rigid frame. Figure 3 shows an example of a mass flow needle with a fixed single conduit. This conduit is The inlet leg and outlet leg 60,61 extending in line from the two coils are generally flat. has two 360'' loops arranged coaxially to the horizontal axis.The inlet leg and the outlet layer 6 The electromagnetic vibrator 64 provided at a position diametrically opposite to 0.61 is The two 360° loop sections 62, 63 are vibrated relative to each other. entrance leg and exit Two diameters on a plane approximately perpendicular to the plane containing the mouth layers 60 and 61 and the electromagnetic pipe lake. A pair of motion detectors 65 and 66 installed at opposite positions through the Bending vibration between two 360° loop sections at diametrically opposite locations Measure. Third motion detection provided at the conduit 590 node, i.e. the central portion Instrument 67 measures the bending vibration of the conduit at the node. Mass flow meter shown in Figure 6 operates on the same principles as described in connection with FIGS. 1, 2, and 3.

FIG. 9 has basically the same structure as the embodiment shown in FIG. 2 with one exception. , showing an example of a mass flow meter that operates on the same principle, in this example, that of a conduit. A pair of sections 70, 71 each measuring bending vibrations in two substantially straight and parallel sections 70, 71. Motion detector 68.69 and motion sensor for measuring bending vibration of conduit in nodal section. The ion detector 72 is the inductive type or capacitive type used in the embodiment shown in FIG. Unlike the motion detectors 25 and 26 of , this is an accelerator type.

Figure 10 shows a single conduit with its two ends 74, 75 fixed to a rigid frame. This conduit shows an example of a mass flow meter having an overhang installation; each extends from the two fixed ends 74, 75 of the conduit and has a 360° Two approximately straight lines connected to each other by a loop section of conduit with a loop angle It has straight and parallel sections 76,77. Two approximately straight lines of conduit The electromagnetic pipe plate provided at the overhanging end of section 76.77 arc 79 causes these sections to vibrate. A pair of motion detectors 80. 81 respectively in absolute form or when a third motion detector 82 is provided. the intersection of the conduits, i.e. two approximately straight lines relative to the center Measure the bending vibration of section 76,77. Of course, motion detector 8 2 is the conduit at the point of intersection where the amplitude of the bending vibration is proportional to the mass flow rate of the fluid through the conduit. Measuring the bending vibration of A pair of substantially straight and parallel sections 7 of conduit 73 6.77 is provided in a plane substantially perpendicular to the loop section 78 of the conduit. , are made to vibrate in relation to each other on that plane. This fruit of mass flow meter The embodiment operates according to the same principles as explained in connection with Figures 1, 2 and 3. .

FIG. 11 each extends from two fixed ends of the conduit and extends 360 connected to each other by loop sections of conduit with loop angles close to Mass flow meter having two substantially straight, parallel sections 83, 84 of conduit 85 installed at the ends of two generally straight sections 83, 84 of the conduit, illustrating another embodiment of the The cut electromagnetic pipe rake 89 connects these sections relative to each other. make it vibrate. A pair of motion detectors 90 and 91 each have an absolute shape and a or substantially straight in relation to the loop section 88 of the conduit. Measure bending vibrations in section 83.84. This embodiment of the mass flow meter , operates on the same principle as described in connection with FIGS.

Figure 12 shows a single conduit with its two ends 92,93 fixed to a rigid frame. This conduit shows an example of a mass flow meter having a respective overhang installation. extending towards each other from the two fixed ends of the conduit; Two generally straight sections connected to each other by a loop section 96 of tubing. 94.95. The loop section of the conduit has two half-holes in this each of the two halves of the conduit, centered on the plane containing the overlapping point between the two halves of the conduit. Two substantially straight sections symmetrical to a substantially straight section 94.95 of The electromagnetic vibrator 99 provided at the 0 overlap point has a voltage of 97.98. The two halves of the conduit are vibrated relative to each other. Four almost straight sexy conduits 4 motion detectors installed on each version 94, 97, 98, 95 Containers 101, 102, 103, 104 are curves of four generally straight sections of conduit. Measure vibration. two generally straight sections 97 adjacent to the central portion of the conduit; ．． The overhanging end of 98 may be secured to a rigid frame 104. , the mass flow rate of any two motion detectors, i.e. 100 and 101.1 By the combination of 02 and 103, 101 and 103 or 100 and 102 etc. is determined by the difference between the two measured bending vibrations. Or motion Determined by averaging the above differences for two or more pair combinations of detectors. Ru.

Figure 13 is connected to the inlet and outlet layers 107 and 108 respectively by parallel connections. illustrating an embodiment of a mass flow meter having a pair of parallel conduits at opposite ends. The first ends 109,110 of the two conduits 105,106 are connected to a rigid frame. It is fixed at 111. On the other hand, the second ends 112, 113 are loop sections 114 and 115 to facilitate bending displacement of the two conduits. There is. An electromagnetic pipe rake 116 provided in the center of the two conduits connects the two conduits. make it vibrate in contrast. A pair arranged symmetrically around the center of the two conduits The motion detectors 117 and 118 each have two halves of two parallel conduits. Measure the relative vibration between. The mass flow rate is determined by two motion detectors 117.1 is determined by the difference between the relative bending vibrations measured by 18 respectively.

The difference may be a phase angle difference or an amplitude difference of bending vibrations.

FIG. 14 shows basically the same structure as the embodiment shown in FIG. 13 with one exception. The exception is the second example, which represents another embodiment of a mass flow meter having a In place of the loop sections 114 and 115 in the embodiment of Figure 13, two parallel An S-shaped conduit Cefsilane 119.120 arranged in a plane perpendicular to the plane containing the conduit. It is to have. Instead of S-shaped sections 119, 120, two parallel conduits using a U-shaped overhang section in a plane approximately perpendicular to the plane containing the You may.

FIG. 15 shows basically the same structure as the embodiment shown in FIG. 13 with one exception. and its exceptions, showing yet another embodiment of a mass flow meter operating on the same principle. is a bellows joint in place of the loop sections 114 and 115 of the embodiment of FIG. Alternatively, a flexible joint 120 is used.

FIG. 16 shows an embodiment of a mass flow meter having a single conduit 123, which conduit , depending on the installation of parallel overhangs, the inlet layer and the outlet layer 126,127 two abbreviations extending from and connected to each other by a curved section of conduit It has straight sections 124,125. two nearly straight sections 124.125 with bellows or flexural fittings 129.130, respectively. and connected to the inlet layer and outlet layer 126,127.

Entrance layer and exit! two substantially straight sections 12 connected to j126.127 4. The electromagnetic vibrator 131 installed near the end of the Sections 124, 125 are vibrated relative to each other. two nearly straight sections A pair of motion detectors 132 and 133 respectively installed at 124 and 125 are , measure the bending vibration of each section. The mass flow rate is The difference between the two bending vibrations measured by vibration detectors 132 and 133 Determined by The difference may be a phase difference or an amplitude difference of bending vibrations.

FIG. 17 shows a unit whose two ends 135, 136 are fixed to a rigid frame. 2 is another embodiment of a mass flow meter with one conduit. This conduit is parallel to each other. The installation of an overhang is done by extending from the fixed end of the conduit 135,136. The curved section of the conduit containing the bellows or flexure fitting 140 in the central portion two substantially straight sections 137, 138 connected to each other by a section 139; It is equipped with An electromagnetic pipe plate located near the curved section 139 of the conduit. arc 141 causes two substantially straight sections 137, 138 to vibrate relative to each other. Ru. A pair of motors each provided in two substantially straight sections 137,138 The bending detectors 142 and 143 detect the bending of these straight sections, respectively. Measure vibration. This embodiment of the mass flow meter is shown in Figures 10, 11 and 16. It operates on the same principle as the embodiment described above.

Bending vibrations in nodal sections are caused by noise associated with pipeline vibrations. This is caused by both convective inertia of the fluid passing through the vibrating conduit. However, Therefore, the nodal When determining the mass flow rate from the ratio of the amplitudes of bending vibrations in a certain section, It is necessary to subtract noise from the signal detected by the motion detector installed in the section. be. Noise can be eliminated by using separate mosiers installed in selected sections to strategize the vibrating conduit. can be measured by a motion detector. When determining the mass flow rate, the electromagnetic pi Two modes are installed on opposite sides of the section with the break in the center. It is common to use the phase difference between two bending vibrations measured by a vibration detector. desirable.

The principles of the invention have already become clear from the illustrated embodiments. carry out this invention structure, arrangement, proportions, elements, particularly adapted to the special working environment and operating conditions of the time; The ability to make various modifications to the material without departing from the principles of the invention. It will be apparent to those skilled in the art that this invention can be modified from the specifics shown and described above. It is not desirable to be limited to the embodiment of and equivalents within the scope of the invention as defined in the following claims. Can be done.

A BCDEF G Fig, 3 Fig, 7 Fig, 12 international search report

Claims (22)

[Claims] 1. In a device for measuring mass flow rate, a) the device is fixed to a rigid frame; each overhanging the two fixed ends and spaced apart from each other. first and second sections extending from each other and connected to each other by a curved section of conduit; at least part of the first section and part of the second section. spaced overlapping conductors with an unsupported central section. The two halves of the tube are each cantilevered by two fixed conduit ends. at least one conduit supported in the form of a A vibration force is applied to the overlapping portion of the conduit, and the vibration force is applied to the two halves of the conduit. c) means adapted to produce relative bending vibrations between the two halves of the conduit; a means of measuring the difference in bending vibration between the Mass flow measuring device equipped with 2. The mass flow rate is determined by the difference in phase angle of the bending vibrations between the two halves of the conduit. The combination of claim 1. 3. The mass flow rate is determined by the difference in the amplitude of the bending vibrations between the two halves of the conduit. A combination according to claim 1. 4. The mass flow rate of a conduit is such that bending vibrations do not occur when the medium entering the conduit is stationary. Determined by the amplitude of the bending vibration measured at the nodal section approximately equal to the central section. The combination of claim 1 defined in claim 1. 5. The above means for measuring the difference in bending vibrations of the two halves of the conduit, respectively 2. The combination of claim 1, comprising at least two motion detectors for measuring . 6. The above means of measuring the difference in bending vibrations when the medium entering the conduit is at rest. The central section of the conduit where vibrations do not occur and the nodal section approximately equal to the conduit section 2. The combination of claim 1, further comprising at least one motion detector for measuring bending vibrations of the height. 7. The first and second sections of the conduit lie approximately in a plane that substantially includes the curved section of the conduit. 2. The combination of claim 1, wherein the combination is arranged on a vertical plane. 8. Routes where the curved section of conduit is approximately equal to or less than 360° 8. The combination of claim 7, wherein the combination has a flat angle. 9. A bent section of conduit may have two loops bending in two opposite directions. Combination of requirement 7. 10. The first and second sections of the conduit are in a plane that substantially includes the curved section of the conduit. 2. The combination of claim 1, wherein the combination is arranged in substantially parallel planes. 11. Where the curved section of the conduit is approximately equal to or less than 360° 11. The combination of claim 10, having a loop angle. 12. The curved section of conduit has two loops that bend in two opposite directions. The combination of claim 10. 13. Each of the two halves of the conduit has a 360° loop, in this case two The 360° loops of the are spaced and coaxially overlapped, and the inlet and outlet legs are Each extends from the two ends of the combination of two 360° loops, and The means for generating the vibratory force is diametrically opposed to the sections extending from the inlet and outlet legs. 2. The combination of claim 1, wherein the combination is arranged in sections in facing positions. 14. The above means for measuring the difference in bending vibrations includes a central axis of two 360° loops. at least two motion detectors each located on two opposite sides of the plane; and means for generating the above-mentioned vibration force, in which case the two motion detectors have the above-mentioned vibration force. 14. The combination of claim 13 for measuring relative bending vibrations between two 360° loops. 15. The above means of measuring the difference in bending vibrations when the medium in the conduit is stationary; Provided at the nodal section approximately equal to the central section of the conduit where bending vibrations do not occur. 14. The combination of claim 13, further comprising at least one motion detector. 16. The first and second sections of conduit are spaced apart from each other in their respective central sections. In this case, the means for generating the above-mentioned vibration force is the above-mentioned center center The means for measuring the difference in bending vibration is provided in the first and second sections of the conduit. at least two mosies provided in one half of each of the two sections; each of the halves connect the first and second sections of conduit to each other. The combination of claim 1 connected to said curved section of a connecting conduit. . 17. first and second sections of conduit connected to said curved section of conduit; 17. The combination of claim 16, wherein each end of the is secured to a rigid frame. 18. Said means for measuring bending vibrations comprises a first Another pair of modules each provided in each remaining half of the second section. further comprising a motion detector, in which the mass flow rate is by the average difference in bending vibration between the detector and the other pair of motion detectors mentioned above. The combination of claim 17 to be determined. 19. In a device for measuring mass flow rate, a) a frame having two rigid ends; and parallel overlapping spaced apart from the two fixed ends respectively. a first, a second extending in a hanging configuration and connected to each other by a curved section of conduit; sections, and the ends of the first and second sections of the conduit are disposed adjacent to each other. but one of the two ends of each of the first and second sections increases at that end. It is equipped with a flexible joint that causes bending vibrations, and , the remaining ends of each of the first and second sections are connected to adjacent sections of the conduit. at least one conduit rigidly connected to the b) Applying a vibratory force to the first and second sections of the conduit, the vibratory force causing the first and second sections of the conduit to means adapted to cause relative bending vibration between the two sections; c) The difference in bending vibrations between the first and second sections of the conduit is determined by the quality of the medium flowing through the conduit. A mass flow measuring device having means for measuring as a measurement value of a mass flow rate. 20. Said means for measuring bending vibrations are provided in each of the first and second sections of the conduit. 20. The set of claim 19, comprising at least two motion detectors for measuring bending vibrations. Match. 21. A device for measuring mass flow rate comprising: a) fixedly connected to the first open leg; a first conduit having one end connected to the second open leg and the other end resiliently connected to the second open leg; and one end elastically connected to the first open leg and fixedly connected to the second open leg. a second conduit provided substantially parallel to the first conduit and having the other end connected to the first conduit; tube and b) Apply a vibration force to the central section of each of the first and second conduits, and the vibration force , means adapted to cause relative bending vibration between the first and second conduits; c) the difference in relative bending vibration between the first and second halves of the first and second conduit combination; , means for measuring as a measure of the mass flow rate of the medium flowing through the first and second conduits. Mass flow measuring device. 22. The above means for measuring the difference in bending vibrations is based on the relative bending between the first and second conduits. Two opposite central sections of each of the first and second sections to measure vibrations Claim 21 further comprising at least two motion detectors disposed on each side. A combination of