WO2005075947A1 - コリオリ流量計 - Google Patents
コリオリ流量計 Download PDFInfo
- Publication number
- WO2005075947A1 WO2005075947A1 PCT/JP2004/014442 JP2004014442W WO2005075947A1 WO 2005075947 A1 WO2005075947 A1 WO 2005075947A1 JP 2004014442 W JP2004014442 W JP 2004014442W WO 2005075947 A1 WO2005075947 A1 WO 2005075947A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inlet
- outlet
- curved
- fluid
- curved tube
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 60
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 description 33
- 238000001514 detection method Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 9
- 238000009499 grossing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 241000233855 Orchidaceae Species 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
- G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
- G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork
Definitions
- the present invention detects the phase difference and / or the vibration frequency proportional to the Coriolis force acting on the flow tube, thereby detecting the mass flow rate and the mass flow rate of the measured fluid.
- a Coriolis flowmeter supports one or both ends of a flow tube through which a fluid to be measured flows.
- the flow tube (hereinafter, vibration) This is a mass flow meter that utilizes the fact that the Coriolis force acting on the flow tube to be added is called the flow tube.
- Coriolis flow meters are well known, and the shape of a flow tube in a Coriolis flow meter is roughly classified into a straight tube type and a curved tube type.
- the straight pipe type Coriolis flowmeter is designed to measure the direct flow between the support and the center of the straight pipe by applying Coriolis force when vibration is applied in the direction perpendicular to the center of the straight pipe at both ends.
- a tube displacement difference that is, a phase difference signal is obtained, and the mass flow rate is detected based on the phase difference signal.
- Such a straight-tube Coriolis flowmeter has a simple, compact and robust structure. However, it also has the problem that high detection sensitivity cannot be obtained.
- FIG. 1 is a basic configuration diagram, a first inflow portion 4 through which a fluid to be measured flows in and a first outflow portion 5 through which the fluid to be measured flows out are provided.
- a curved tube portion 2 ; a second curved tube portion 3 provided with a second inlet 6 through which the fluid to be measured and flows in and a second outlet 7 through which the fluid to be measured flows out.
- the distance between the first curved pipe section 2 and the second curved pipe section 3 on the side of the inlet ports 4 and 6 into which the fluid to be measured flows increases as the distance from each of the inlet ports 4 and 6 increases.
- the distance between the first curved pipe section 2 and the second curved pipe section 3 on the outlet ports 5 and 7 side where the fluid to be measured flows out is set so as to be in a non-parallel state.
- a flow tube 1 for measurement composed of a pair of curved pipe sections 2 and 3 arranged so as to become larger and become non-parallel with distance from 5, 7;
- an object of the present invention is to provide a first curved pipe section provided with a first inlet port 4 for flowing a fluid to be measured and a first outlet port 5 for flowing the fluid to be measured. 2, a second curved pipe part 3 provided with a second inlet part 6 for flowing the fluid to be measured and a second outlet part 7 for flowing out the fluid to be measured,
- a connecting pipe section 9. connecting the first outlet section 5 'and the second inlet section 6 between the first outlet section 5 and the second inlet section 6;
- the distance between the first curved pipe section 2 and the second curved pipe section 3 on the inlet ports 4 and 6 into which the fluid to be measured flows increases as the distance from each of the inlet ports 4 and 6 increases.
- the distance between the first curved pipe section 2 and the second curved pipe section 3 on the side of the outlet sections 5 and 7 from which the fluid to be measured flows out is set to be the respective outlets.
- a flow tube 1 for measurement composed of a pair of curved pipe sections 2 and 3 which are arranged so as to become larger and become non-parallel with each other from the sections 5 and 7;
- the first inflow section 4 and the first outflow section 5 of the first curved pipe section 2 and the second inflow section 6 and the second flow section of the second curved pipe section 3 are so arranged that the pipe axis becomes a straight line.
- the object of the present invention is achieved by forming the fixing member 8 in the Coriolis flowmeter into a substantially circular shape or an arc shape in plan view.
- FIG. 1 shows a state in which a repulsive action has occurred in the driving means.
- FIG. The arrow in the middle points in the opposite direction.
- torsional stress due to torsional vibration converted from bending vibration is applied.
- the first inlet 4 and the second inlet 6 are non-parallel, and the first outlet 5 and the second outlet 7 are also non-parallel.
- the first inlet 4 and the second inlet 6 and the first outlet 5 and the second outlet 7 have a symmetrical positional relationship. From this, when the first curved pipe section 2 and the second curved pipe section 3 are vibrated in opposition, the torsional stress caused by the first inlet section 4 and the second outlet section 7 is offset by these two, and The torsional stress generated by the second inlet 6 and the first outlet 5 is also offset by these two. Therefore, the fixed member 8 is in a state in which almost no vibration is generated, and the load applied to the first inlet part 4, the second inlet part 6, the first outlet part 5, and the second outlet part 7 is reduced. Less.
- the present invention even if the rigidity of the fixing member 8 is low and the mass is small, vibration leakage can be effectively suppressed. Furthermore, as shown in FIG. 1, the first outlet 5, the second inlet 6, and the connecting pipe 9 are arranged continuously in a straight line. According to the present invention, the manufacturability of the Coriolis flowmeter can be enhanced, and the durability of the Coriolis flowmeter can be enhanced.
- vibration leakage hardly occurs.
- FIG. 1 is a schematic diagram showing an embodiment of a Coriolis flow meter according to the present invention, and is a basic configuration diagram of a main part of the Coriolis flow meter.
- Fig. 2 is a vertical cross-sectional view (including the housing) of the Coriolis flowmeter of Fig. 1 at the center position.
- FIG. 4 is a view of the first embodiment.
- FIG. 4 (a) is a front view of a main part
- FIG. 4 (b) is a cross-sectional view taken along the line A1-A1 in FIG. 4 (a)
- FIG. ) Is a cross-sectional view taken along line B 1 -B 1 in FIG. 4 (a)
- FIG. 4 (d) is a side view of FIG. 4 (a).
- FIG. 5 is a view of the second embodiment.
- FIG. 5 (a) is a front view of a main part
- FIG. 5 (b) is a cross-sectional view taken along line A2--A2 of FIG. 5 (a)
- FIG. ) Is a sectional view taken along the line B 2-B 2 in FIG. 5 (a)
- FIG. 5 (d) is a side view of FIG. 5 (a). is there.
- FIG. 6 is a diagram of the third embodiment.
- FIG. 6 (a) is a front view of a main part
- FIG. 6 (b) is a cross-sectional view taken along line A3—A3 of FIG. 6 (a)
- FIG. ) Is a sectional view taken along the line B 3 -B 3 in FIG. 6 (a)
- FIG. 6 (d) is a side view of FIG. 6 (a).
- FIG. 7 is a view of the fourth embodiment, in which FIG. 7 (a) is a front view of a main part, FIG. 7 (b) is a sectional view taken along line A4-A4 of FIG. 7 (a), and FIG. ) Is a sectional view taken along line B4-B4 in FIG. 7 (a), and FIG. 7 (d) is a side view of FIG. 7 (a).
- FIG. 8 is a view of the fifth embodiment, in which FIG. 8 (a) is a front view of a main part, and FIG. 8 (b) is a sectional view taken along line A5—A5 in FIG. 8 (a). (c) shows Figure 8.
- FIG. 8 (a) is a sectional view taken along the line B5-B5, and FIG. 8 (d) is a side view of FIG. 8 (a).
- FIG. 9 is a view of the sixth embodiment.
- FIG. 9 (a) is a front view of a main part
- FIG. 9 (b) is a cross-sectional view taken along line A6-A6 of FIG. 9 (a)
- FIG. ) Is a sectional view taken along line B 6 -B 6 in FIG. 9 (a)
- FIG. 9 (d) is a side view of FIG. 9 (a).
- Fig. 10 is an explanatory view of pushing another example of the shape of the fixing member.
- Fig. 10 (a) is a front view of the Coriolis flowmeter
- Fig. 10 (b) is A in Fig. 10 (a). 7- a 7 line cross-sectional view
- FIG. 1 0 (c) FIG. 1 0 B 7- B 7 along line cross-sectional view of (a)
- a side view of FIG. 1 0 (d) is Fig. 1 0 (a) D
- FIG. 11 is a perspective view showing a flow tube of a conventional Coriolis flowmeter.
- FIG. 12 is a plan view of the flow tube of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic diagram showing an embodiment of a Coriolis flow meter according to the present invention, and is a basic configuration diagram of a main part of the Coriolis flow meter.
- Fig. 2 is a longitudinal sectional view (including the housing) of the Coriolis flowmeter of Fig. 1 at the center.
- a Coriolis flowmeter 11 of the present invention includes a housing 12, a flow tube 1 (hereinafter, referred to as a flow tube) housed in the housing 12, and a driving device 13. , A sensor unit (not shown) having a pair of vibration detection sensors 14, 14, and a temperature sensor (not shown), and a signal for performing arithmetic processing such as mass flow rate based on a signal from the sensor unit It comprises an arithmetic processing unit (not shown) and an excitation circuit unit (not shown) for exciting the drive device 13.
- the housing 1.2 has a structure that is strong against bending and twisting.
- the housing 12 is formed large enough to accommodate the flow tube 1 with the fixing member 8 for fixing the flow tube 1 attached thereto. Further, the housing 12 is formed so as to protect a main part of the flow meter such as the flow tube 1.
- the inside of such a casing 12 is filled with an inert gas such as an argon gas. The filling of the inert gas prevents condensation on the flow tube 1 and the like.
- the casing 12 is attached to the fixing member 8 by appropriate means.
- the fixing member 8 is formed in a circular shape in plan view.
- the fixing member 8 preferably has a circular shape in plan view, but is not necessarily required to have a circular shape in plan view. That is, for example, the fixing member may be formed as a rectangular fixing member in a plan view or an arc-shaped fixing member 8 in the Coriolis flowmeter 1 shown in FIG.
- the fixing member 8 is formed in a wall shape in which the inside is a space.
- the flow tube 1 is formed by looping a single flow tube for measurement (the flow tube 1 is not necessarily limited to a single flow tube having a loop shape. , Which will be described later with reference to the sixth embodiment).
- the first bending pipe 2 and the second bending pipe 3 are connected to each other.
- the connecting pipe 9 connects the first bending pipe 2 and the second bending pipe 3.
- the first curved tube portion 2 and the second curved tube portion 3 are both substantially oblong extending in the horizontal direction. It is formed in a shape.
- the first curved pipe portion 2 is formed with a first inlet port 4 through which the fluid to be measured flows in and a first outlet port 5 through which the fluid to be measured flows out.
- the second curved tube 3 has a second inlet 6 through which the fluid to be measured flows in and a second outlet 7 through which the fluid to be measured flows out.
- the connection pipe 9 is provided between the first outlet 5 and the second inlet 6 . That is, the connection pipe section 9 is provided to connect the two of the first outlet port 5 and the second inlet port 6.
- the first outlet part 5, the second inlet part 6, and the connecting pipe part 9 are arranged and formed so as to be continuous in a straight line, in other words, such that three pipe shafts are aligned.
- the first inlet part 4, the second inlet part 6, the first outlet part 5, and the second outlet part 7 are each fixed to a fixing member 8.
- the first inlet port 4 and the second inlet port 6 are arranged and fixed such that the distance between the first inlet port 4 and the second inlet port 6 becomes larger as the distance from the fixing member 8 increases.
- the first outlet portion 5 and the second outlet portion 7 are arranged and fixed so that the distance between the first outlet portion 5 and the second outlet portion 7 increases as the distance from the fixing member 8 increases.
- the first inlet 4 and the second inlet 6 are arranged and fixed so that the first outlet 5 and the second outlet 7 have a symmetrical positional relationship.
- first inlet portion 4, the second inlet portion 6, the first outlet portion 5, and the second outlet portion 7 are seen fixed to the fixing member 8, they are on the same plane. It can be seen that the first inlet portion 4, the second inlet portion 6, the first outlet portion 5, and the second outlet portion 7 are fixed to the fixing member 8 only in this manner. Absent. For example, the first inlet 4 and the second outlet 7 are on the same plane on the fixed member 8, and the first outflow The mouth 5 and the second inlet 6 may be fixed on the same plane.
- the end 4a of the first inlet 4 is drawn out to allow the fluid to be measured to flow.
- the terminal 7a of the second outlet 7 is drawn out to discharge the fluid to be measured, similarly to the terminal 4a.
- the terminal 4a and the terminal 7a are drawn in a direction perpendicular to the arrow P in FIG. 1 and in a direction opposite to each other.
- the fluid to be measured that has flowed through the end 4 a of the first inlet 4 passes through the first curved pipe 2, the connecting pipe 9, and the second curved pipe 3, and passes through the second outlet 7. It can flow out from the terminal 7a (see the arrow in Fig. 1 for the flow of the fluid to be measured).
- first curved pipe portion 2 is formed with curved portions 15 and 15 having a substantially circular arc shape and a straight top portion 16.
- second curved pipe section 3 also has substantially arc-shaped curved sections 15, 15, which are straight and straight. A top 16 is formed.
- the top part 16 of the first bending pipe part 2 and the top part 16 of the second bending pipe part 3 are arranged in parallel with an interval enough to sandwich the driving device 13.
- the bending portions 15 and 15 of the first bending tube portion 2 and the bending portions 15 and 15 of the second bending tube portion 3 are also spaced from each other so that the vibration detection sensors 14 and 14 are sandwiched therebetween. It is arranged with a gap.
- the first inlet portion 4 and the second inlet portion 6 are arranged and formed such that the interval between the curved portions 15 and 15 is wide, and the interval between the fixing members 8 is narrow.
- the first outlet portion 5 and the second outlet portion 7 are also formed so as to have a large interval at the positions of the curved portions 15 and 15 and a small interval at the position of the fixing member 8. ing.
- the flow tube 1 is made of a material commonly used in this technical field, such as stainless steel, Hastelloy, and titanium alloy.
- the driving device 13 constituting the sensor unit is for causing the first curved tube portion 2 and the second curved tube portion 3 of the flow tube 1 to vibrate in opposition, and includes a coil 17 and a magnet 18. It is configured with.
- Such a driving device 13 is disposed at the center of the tops 16 and 16 of the flow tube 1 and in a state of being sandwiched therebetween. In other words, the driving device 13 is mounted at a position that is not offset with respect to the vibration direction of the flow tube 1.
- the coil 17 of the driving device 13 is attached to one of the tops 16 of the flow chamber 1 using a dedicated fixture.
- FPC flexible 'print' circuit
- electric wires are drawn out from the coil 17.
- the magnet 18 of the driving device 13 is attached to the other top 16 of the flow tube 1 by using a special attachment.
- the driving device 13 When a suction action occurs in the driving device 13, the magnet 18 is inserted into the coil 17, and as a result, the tops 16 and 16 of the floating tube 1 come close to each other. On the other hand, when the repulsion occurs, the tops 16 and 16 of the flow tube 1 are separated from each other. Since the flow tube 1 is fixed to the fixing member 8 as described above, the driving device 13 is configured to alternately drive the flow tube 1 in the rotational direction about the fixing member 8.
- the vibration detection sensors 14 and 14 constituting the sensor section are sensors for detecting the vibration of the flow tube 1 and detecting the phase difference proportional to the Coriolis force applied to the flow tube 1. Each of them is provided with a coil 19 and a magnet 20. (Not limited to this, displacement and speed of acceleration sensor, optical means, capacitance type, distortion type (piezo type), etc.) Hand to detect any of the acceleration It is sufficient if it is a step).
- the vibration detection sensors 14 and 14 having such a configuration detect, for example, a position within a range sandwiched between the curved portions 15 and 15 of the mouth tube 1 and a phase difference proportional to the force of the coil. It is located in a position where it can be performed.
- Each coil 19 of the vibration detection sensors 14 and 14 is attached to one of the curved portions 15 of the flow tube 1 using a dedicated attachment. From each coil 19, an FPC (Flexible Print 'Circuit) or an electric wire is drawn out, although not particularly shown. Each magnet 20 of the vibration detection sensors 14 and 14 is attached to the other curved portion 1.5 of the flow tube 1 by using a dedicated attachment.
- FPC Flexible Print 'Circuit
- a substrate and the like are provided inside the Coriolis flowmeter 11 of the present invention.
- a wire harness that is drawn out of the housing 12 is connected to the board.
- the temperature sensor that forms part of the above sensor unit is a Coriolis flow meter
- FPC flexible printed circuit
- the signal arithmetic processing unit includes a detection signal relating to the deformation of the flow tube 1 from one vibration detection sensor 14, a detection signal relating to the deformation of the flow tube 1 from the other vibration detection sensor 14, and a temperature sensor. However, the wiring and the connection are made such that the detection signals relating to the temperature of the flow tube 1 are respectively inputted.
- a signal processing unit is configured to calculate the mass flow rate and the density based on each detection signal input from the sensor unit. Further, the signal operation processing unit is configured so that the mass flow rate and the density obtained by the operation are output to a display (not shown).
- the excitation circuit section includes a smoothing section, a comparison section, a target setting section, a variable amplification section, and a drive output section.
- the smoothing portion is wired so as to extract a detection signal from one vibration detection sensor 14 (or the other vibration detection sensor 14). Further, the smoothing unit has a function of rectifying and smoothing the input detection signal and outputting a DC voltage proportional to the amplitude thereof.
- the comparison unit compares the DC voltage from the smoothing unit with the target setting voltage output from the target setting unit, and controls the gain of the variable amplification unit to control the amplitude of the resonance vibration to the target setting voltage. It has a function that can do it.
- the mass flow rate is calculated by the signal processing unit based on the phase difference generated by the Coriolis force at the points of the vibration detection sensors 14 and 14.
- the density is also calculated from the vibration frequency.
- the arrow P in FIG. 3 is defined as the vertical direction
- the arrow Q is defined as the horizontal direction.
- a first curved tube part 32 and a second curved tube part 33 constituting a flow tube are fixed to a fixing member 31.
- the first curved tube portion 32 and the second curved tube portion 33 are both formed in an inverted U shape, and are arranged to face each other.
- the surface formed by the first curved tube portion 32 and the surface formed by the second curved tube portion 33 are parallel.
- the first curved pipe part 32 has a first inlet part 34 into which the fluid to be measured flows and a first outlet part 35 from which the fluid to be measured flows out.
- the second curved pipe part 33 has a second inlet part 36 through which the fluid to be measured flows in and a second outlet part 37 through which the fluid to be measured flows out. 1st inlet 3 4 ⁇ 1st outlet 3 5 ⁇ 2nd flow
- the inlet 36 and the second outlet 37 extend vertically, and are fixed to be orthogonal to the upper surface 31 a of the fixing member 31.
- a first curved tube portion 52 and a second curved tube portion 53 constituting a flow tube are fixed to the fixing member 51.
- the first curved tube portion 52 and the second curved tube portion 53 are both formed in an oblong shape extending in the horizontal direction, and are arranged to face each other.
- the surface formed by the first curved tube portion 52 and the surface formed by the second curved tube portion 53 are parallel to each other.
- the first curved tube portion 52 has a first inlet portion 54 into which the fluid to be measured flows in and a first outlet portion 55 into which the fluid to be measured flows out.
- the second curved tube portion 53 has a second inlet portion 56 through which the fluid to be measured flows in and a second outlet portion 57 through which the fluid to be measured flows out.
- the first inlet port 54, the first outlet port 55, the second inlet port 56, and the second outlet port 57 extend in the horizontal direction, and the side surface 51a of the fixing member 51 is provided. , 5 la and is fixed to be orthogonal.
- the torsional stress due to the first inlet port 54 and the torsional stress due to the first outlet port 55 are torsional stresses in the same direction
- the torsional stress due to the second inlet port 56 and the torsional stress due to the second outlet port 5 5 are the same. Since the torsional stress due to 7 is a 'torsional stress' in the same direction, there is a possibility that the fixing member 51 may be bent to be curved.
- FIG. 1 shows a state in which the repulsive action of the drive device 13 occurs In the case of suction action, Fig. 1: In the middle, the arrow points in the opposite direction), the first inlet 4, the second inlet 6, the first outlet 5, and the second outlet 7.
- the torsional stress due to the torsional vibration converted from the bending vibration is applied to the fixing member 8 to which is fixed.
- the first inlet 4 and the second inlet 6 are non-parallel
- the first outlet 5 and the second outlet 7 are also non-parallel.
- the fixing member 8 Since the first inlet part 4 ′ and the second inlet part 6 are symmetrical with the first outlet part 5 and the second outlet part 7, the first inlet part 4 and the second outlet part The torsional stress by the part 7 is canceled by these two, and the torsional stress by the second inlet part 6 and the first outlet part 5 is also canceled by these two. Therefore, the fixing member 8 is in a state in which almost no vibration occurs.
- the load applied to the first inlet port 4, the second inlet port 6, the first outlet port 5, and the second outlet port 7 is reduced. Even if the rigidity of the fixing member 8 is low or the mass is small, vibration leakage can be effectively suppressed. Further, as shown in FIG. 1, the first outlet 5, the second inlet 6, and the connecting pipe 9 are arranged continuously in a straight line. The manufacturability of the meter can be improved, and the durability of the Coriolis flowmeter can be increased. As described above, according to the present invention, it is possible to provide the Coriolis flowmeter 11 which is less likely to cause vibration leakage, is easy to manufacture, and has durability.
- the flow tube 1 is formed by looping one flow tube for measurement, and the first curved tube portions 2 and It is configured to include a second curved tube portion 3 and a connection tube portion 9 connecting the first curved tube portion 2 and the second curved tube portion 3.
- the flow tube 1 illustrated in FIGS. 4 (a) to (d) is an embodiment of the flow tube 1 described and described with reference to FIG. 1. The configuration and configuration will be briefly described below.
- the first curved pipe section 2 has a first inlet port 4 and a first outlet port 5 formed therein.
- the second curved pipe section 3 has a second inlet section 6 and a second outlet section 7 formed therein.
- the connecting pipe 9 is provided between the first outlet 5 and the second inlet 6.
- the first outlet 5, the second inlet 6, and the connecting pipe 9 are arranged and formed so as to be continuous in a straight line.
- the first inlet section 4 and the second inlet section 6 are fixed on the same plane on a fixing member 8, and the first inlet section 4 and the second inlet section 6 are arranged in a non-parallel state. I have. Further, the first outlet section 5 and the second outlet section 7 are fixed to the fixing member 8 on the same plane as the first inlet section 4 and the second inlet section 6. The 5 and the second outlet 7 are arranged in a non-parallel state.
- the end 4a of the first inlet 4 and the end 7a of the second outlet 7 are perpendicular to the arrow P in FIG. 1 as shown in FIG. Is drawn out so that the flow direction (end 4a) and the flow direction of the fluid to be measured (end 7a) are opposite to each other.
- a driving device 13 is provided between the tops 16 and 16 of the first bending pipe 2 and the second bending pipe 3 . Further, between the bending portions 15 and 15 of the first bending tube portion 2 and the second bending tube portion 3, vibration detection sensors 14 and 14 are provided.
- the first inlet port 4 and the second inlet port 6 are provided with a known brace bar 21 straddling these. Similarly, the first outlet 5 and the second outlet 7 are also provided with a known brace bar 21 across them.
- the brace bar 21 is arranged at a predetermined distance from the fixing member 8. The arrow in the figure indicates the flow of the fluid to be measured.
- the flow tube 1 shown in FIGS. 5 (a) to (d) is a first flow of the flow tube 1 shown in FIGS. 4 (a) to (d). It is configured by changing the drawing direction of the end 7a of the part 7. That is, the terminal 4a of the first inlet 4 and the terminal 7a of the second outlet 7 shown in FIG. 5 are oriented in the direction in which the fluid to be measured flows (terminal 4) as shown in FIG. a) and the direction in which the fluid to be measured flows out (end 7a) are drawn in the same direction (vertical direction: see arrow P in Fig. 1).
- the end 4a of the first inlet 4 and the end 7a of the second outlet 7 are center lines of the first curved pipe 2 and the second curved pipe 3 shown in FIG. 5 (b). It has been pulled out so as to line up on L1.
- the flow tube 1 shown in FIGS. 6 (a) to (d) is composed of the end 4 a of the first inlet 4 and the second outlet 7 of the flow tube 1 shown in FIGS. 4 (a) to (d). It is configured by changing the pull-out direction of the terminal 7a. That is, the terminal 4a of the first inlet 4 and the terminal 7a of the second outlet 7 shown in FIG. 6 are oriented in the direction in which the fluid to be measured flows (terminal 4) as shown in FIG. a) and the direction in which the fluid to be measured flows out (end 7a) are drawn in the same direction (vertical direction: see arrow P in Fig. 1). Also, at the end of this first inlet 4 As shown in Fig.
- the flow tube 1 shown in FIGS. 7 (a) to (d) is the end 4 a of the first inlet 4 and the second outlet 7 of the flow tube 1 shown in FIGS. 4 (a) to (d). It is configured by changing the pull-out direction of the terminal 7a. That is, as shown in FIG. 7 (a), the end 4a of the first inlet 4 and the end 7a of the second outlet 7 shown in FIG. 7 are directed in the direction in which the fluid to be measured flows (end 4a). , And the direction in which the fluid to be measured flows out (end 7a) are drawn in the same direction (vertical direction: see arrow P in Fig. 1).
- first curved pipe portion 2 in which the end 4a of the first inlet port 4 is formed, and the second curved pipe portion 3 in which the end 7a of the second outlet port 7 is formed While being bent as shown in FIG. 7 (b), it is pulled out so as to be aligned on a center line L 2 orthogonal to the center line L 1 of the first curved tube portion 2 and the second curved tube portion 3 shown in FIG. 7 (b). Has been done.
- the flow tube 1 ' is composed of a first bay curved pipe section 2' and a second curved pipe section 3 '.
- the first curved tube portion 2 ′ has a first inlet port 4 ′ and a first outlet port 5 ′ and a force S.
- a second inlet portion 6' and a second outlet portion 7 ' are formed in the second curved tube portion 3 '.
- the first inlet section 4 'and the second inlet section 6' are identical to the manifold 22 of the fixing member 8 'and are fixed on a plane, and the first inlet section 4' and the second inlet section are fixed. 6 'are arranged in a non-parallel state.
- the first outlet 5 ′ and the second outlet 7 ′ are flush with the manifold 22 of the fixing member 8 ′, like the first inlet 4 ′ and the second inlet 6 ′.
- the first outlet 5 ′ and the second outlet 7 ′ are arranged in a non-parallel state.
- the fluid to be measured flows into the manifold 22 of the fixing member 8 '.
- the fluid to be measured flows out from the manifold 23 of the fixed member 8 '.
- Each of the flow tubes 1 and 2 shown in FIGS. 4 to 1 ⁇ of the first curved tube section 2, 2 ′ and the second curved tube section 3, 3 ′ have respective tops 16, 16, 1.
- a drive device 13 is provided between 6 ′ and 16 ′.
- vibration detecting sensors 14, 1 ′ are provided between the curved sections 15, 15, 15 ′, 15 ′ of the first bay curved pipe sections 2, 2 ′ and the second curved pipe sections 3, 3 ′. 4 are provided.
- the first inlet portions 4 and 4 ′ and the second inlet portions 6 and 6 ′ are provided with a place bar 21 across the first inlet portions 4 and 4 ; and the second inlet portions 6 and 6 ′.
- the brace bar 21 is arranged at a predetermined distance from the fixing members 8, 8 'so as not to contact the fixing members 8, 8'.
- the arrows in FIGS. 4 to 10 indicate the flow of the fluid to be measured.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04773530A EP1726921B1 (en) | 2004-02-03 | 2004-09-24 | Coriolis flowmeter |
AU2004315306A AU2004315306B2 (en) | 2004-02-03 | 2004-09-24 | Coriolis flowmeter |
MXPA06008695A MXPA06008695A (es) | 2004-02-03 | 2004-09-24 | Flujometro coriolis. |
AT04773530T ATE462959T1 (de) | 2004-02-03 | 2004-09-24 | Coriolis-strömungsmesser |
DE602004026358T DE602004026358D1 (de) | 2004-02-03 | 2004-09-24 | Coriolis-strömungsmesser |
US10/585,939 US7739920B2 (en) | 2004-02-03 | 2004-09-24 | Coriolis flowmeter having a fixing member with non-parallel inlet and outlet portions |
CA2552867A CA2552867C (en) | 2004-02-03 | 2004-09-24 | Coriolis flowmeter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004026811A JP3782421B2 (ja) | 2004-02-03 | 2004-02-03 | コリオリ流量計 |
JP2004-026811 | 2004-02-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005075947A1 true WO2005075947A1 (ja) | 2005-08-18 |
Family
ID=34835870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/014442 WO2005075947A1 (ja) | 2004-02-03 | 2004-09-24 | コリオリ流量計 |
Country Status (13)
Country | Link |
---|---|
US (1) | US7739920B2 (ja) |
EP (1) | EP1726921B1 (ja) |
JP (1) | JP3782421B2 (ja) |
KR (1) | KR100797728B1 (ja) |
CN (1) | CN100412514C (ja) |
AT (1) | ATE462959T1 (ja) |
AU (1) | AU2004315306B2 (ja) |
CA (1) | CA2552867C (ja) |
DE (1) | DE602004026358D1 (ja) |
MX (1) | MXPA06008695A (ja) |
MY (1) | MY136577A (ja) |
TW (1) | TWI238243B (ja) |
WO (1) | WO2005075947A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3782438B1 (ja) * | 2005-07-12 | 2006-06-07 | 株式会社オーバル | 二重ループ構造のフローチューブを備えたコリオリ流量計 |
JP4679658B2 (ja) | 2009-10-10 | 2011-04-27 | 株式会社オーバル | フィールド機器の光電センシング感度調整 |
DE102009046043A1 (de) * | 2009-10-27 | 2011-05-05 | Endress + Hauser Flowtec Ag | Messwandler vom Vibrationstyp |
TWI410611B (zh) * | 2009-12-11 | 2013-10-01 | Oval Corp | Coriolis flowmeter |
JP4694645B1 (ja) * | 2010-02-19 | 2011-06-08 | 株式会社オーバル | 信号処理方法、信号処理装置、及び振動型密度計 |
NL1038047C2 (en) | 2010-06-16 | 2011-12-20 | Berkin Bv | Coriolis flowsensor. |
DE102011117282A1 (de) * | 2011-08-16 | 2013-02-21 | Krohne Ag | Coriolis-Massedurchflussmessgerät |
EP3296704A1 (de) * | 2016-09-16 | 2018-03-21 | Energoflow AG | Fluidzähler |
CN107478285B (zh) * | 2017-07-25 | 2020-03-20 | 大连美天三有电子仪表有限公司 | 科氏力质量流量计 |
EP3665446B1 (en) * | 2017-08-08 | 2022-09-28 | Micro Motion, Inc. | Flowmeter false totalizing elimination device and method |
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JPH04157328A (ja) * | 1990-10-19 | 1992-05-29 | Tokico Ltd | 質量流量計 |
JPH067325Y2 (ja) * | 1987-06-19 | 1994-02-23 | トキコ株式会社 | 質量流量計 |
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JPH11211529A (ja) * | 1998-01-21 | 1999-08-06 | Oval Corp | コリオリ流量計 |
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US4127028A (en) * | 1977-06-07 | 1978-11-28 | Halliburton Company | Coriolis mass flow rate metering means |
US4311054A (en) * | 1978-11-13 | 1982-01-19 | Halliburton Company | Mass flowmeter with sensor gain control |
US5423221A (en) * | 1986-02-11 | 1995-06-13 | Abb K-Flow Inc. | Mass flow measuring device |
US4730501A (en) * | 1986-05-19 | 1988-03-15 | Exac Corporation | Single tube parallel flow coriolis mass flow sensor |
EP0271605B1 (de) * | 1986-10-02 | 1990-12-27 | Krohne AG | Massendurchflussmessgerät mit Einrichtung zur Ermittlung der Corioliskraft |
US5343764A (en) * | 1986-10-28 | 1994-09-06 | The Foxboro Company | Coriolis-type mass flowmeter |
DE3829059A1 (de) * | 1988-08-26 | 1990-03-08 | Danfoss As | Nach dem coriolis-prinzip arbeitendes stroemungsmessgeraet |
US5115683A (en) * | 1988-09-27 | 1992-05-26 | K-Flow Division Of Kane Steel Co., Inc. | Coriolis mass flow meter adapted for low flow rates |
EP0462711A1 (en) * | 1990-06-16 | 1991-12-27 | Imperial Chemical Industries Plc | Fluid flow measurement |
FR2681520B1 (fr) | 1991-09-24 | 1993-12-24 | Henry Graf | Dispositif pour la mesure des amplitudes de deux vertebres dans trois plans orthogonaux. |
US5357811A (en) * | 1992-02-11 | 1994-10-25 | Exac Corporation | Single tube coriolis flow meter with floating intermediate section |
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-
2004
- 2004-02-03 JP JP2004026811A patent/JP3782421B2/ja not_active Expired - Lifetime
- 2004-09-10 TW TW093127513A patent/TWI238243B/zh not_active IP Right Cessation
- 2004-09-24 DE DE602004026358T patent/DE602004026358D1/de active Active
- 2004-09-24 AT AT04773530T patent/ATE462959T1/de not_active IP Right Cessation
- 2004-09-24 WO PCT/JP2004/014442 patent/WO2005075947A1/ja active Application Filing
- 2004-09-24 US US10/585,939 patent/US7739920B2/en active Active
- 2004-09-24 CA CA2552867A patent/CA2552867C/en active Active
- 2004-09-24 AU AU2004315306A patent/AU2004315306B2/en not_active Ceased
- 2004-09-24 MX MXPA06008695A patent/MXPA06008695A/es active IP Right Grant
- 2004-09-24 EP EP04773530A patent/EP1726921B1/en active Active
- 2004-09-24 KR KR1020067017782A patent/KR100797728B1/ko active IP Right Grant
- 2004-09-24 CN CNB2004800412650A patent/CN100412514C/zh active Active
- 2004-09-30 MY MYPI20044009A patent/MY136577A/en unknown
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JPH067325Y2 (ja) * | 1987-06-19 | 1994-02-23 | トキコ株式会社 | 質量流量計 |
JPH04157328A (ja) * | 1990-10-19 | 1992-05-29 | Tokico Ltd | 質量流量計 |
JP2654341B2 (ja) * | 1992-11-18 | 1997-09-17 | エンドレス ウント ハウザー フローテック アクチエンゲゼルシャフト | コリオリ原理による質量流量計 |
JPH11211529A (ja) * | 1998-01-21 | 1999-08-06 | Oval Corp | コリオリ流量計 |
Also Published As
Publication number | Publication date |
---|---|
TW200526931A (en) | 2005-08-16 |
DE602004026358D1 (de) | 2010-05-12 |
MY136577A (en) | 2008-10-31 |
CA2552867A1 (en) | 2005-08-18 |
JP3782421B2 (ja) | 2006-06-07 |
KR100797728B1 (ko) | 2008-01-24 |
ATE462959T1 (de) | 2010-04-15 |
CN1914484A (zh) | 2007-02-14 |
KR20060124736A (ko) | 2006-12-05 |
MXPA06008695A (es) | 2007-01-19 |
US20070163363A1 (en) | 2007-07-19 |
EP1726921A1 (en) | 2006-11-29 |
AU2004315306A1 (en) | 2005-08-18 |
JP2005221251A (ja) | 2005-08-18 |
CN100412514C (zh) | 2008-08-20 |
EP1726921A4 (en) | 2008-01-23 |
CA2552867C (en) | 2011-03-29 |
AU2004315306B2 (en) | 2008-11-06 |
EP1726921B1 (en) | 2010-03-31 |
TWI238243B (en) | 2005-08-21 |
US7739920B2 (en) | 2010-06-22 |
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