WO2005054791A1 - コリオリ流量計 - Google Patents
コリオリ流量計 Download PDFInfo
- Publication number
- WO2005054791A1 WO2005054791A1 PCT/JP2004/014454 JP2004014454W WO2005054791A1 WO 2005054791 A1 WO2005054791 A1 WO 2005054791A1 JP 2004014454 W JP2004014454 W JP 2004014454W WO 2005054791 A1 WO2005054791 A1 WO 2005054791A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pair
- flow tube
- coriolis flowmeter
- driving device
- tube
- Prior art date
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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
- 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
Definitions
- the present invention relates to a Coriolis flowmeter, and more particularly, to a Coriolis flowmeter configured to include at least one flow tube including a curved tube.
- 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.
- a curved tube Coriolis flowmeter is superior to a straight tube Coriolis flowmeter in that it can select a shape to effectively extract the Coriolis force.
- the mass flow rate can be detected.
- a curved tube type Coriolis flowmeter equipped with one flow tube for example, Japanese Patent Publication No. No. 0
- a device equipped with two parallel flow tubes for example, see Japanese Patent No. 2939392
- a device equipped with a single flow tube in a looped state For example, refer to Japanese Patent No. 29516651).
- the Coriolis flowmeter having one flow tube has the advantage that the mass flowmeter can be provided at a low cost because the shape and configuration are the simplest. Have.
- it also has the following problems. That is, in the case of a Coriolis flow meter having one flow tube, since there is only one flow tube, a Coriolis flow meter having two flow tubes when the flow tube is vibrated is used. However, such a vibration balance cannot be secured, and a stable output signal cannot be obtained. Disclosure of the invention
- An object of the present invention is to provide a Coriolis flowmeter that can be provided at a low cost with a simple configuration, and that can obtain a stable output signal when the flow tube is vibrated.
- a pair of vibration detection sensors mounted at symmetrical positions on both left and right sides of the flow tube and detecting vibrations having a phase difference proportional to the Coriolis force acting on the flow tube comprising: The drive device is arranged on the first shaft, and a pair of second drive devices for alternately driving the flow tube in the rotational direction are arranged at symmetrical positions on both left and right sides of the drive device; One The pair of second driving devices are driven in phase, and the driving device and the pair of second driving devices are driven in opposite phases.
- the driving device drives the flow tube to vibrate in the tertiary vibration mode. Vibrates to form a beam. That is, the pair of second driving devices are driven in the same phase, and the driving devices are driven in the opposite phase to the pair of second driving devices, so that the flow tube forms a vibration beam in the third vibration mode. Vibrate.
- the flow tube of the Coriolis flow meter according to claim 1 has a flow tube of the Coriolis flow meter according to claim 1, which is compared with a flow tube of a Coriolis flow meter having only a pair of second driving devices.
- the Coriolis flow meter described in claim 1 can be configured with a simple shape and can be inexpensive.
- a Coriolis flowmeter according to the invention according to claim 2 is the Coriolis flowmeter according to claim 1, wherein the pair of vibration detection sensors includes the driving device and the pair of vibration detection sensors.
- the second drive unit is arranged and arranged in each of the second drive units.
- a Coriolis flowmeter according to a third aspect of the present invention is the Coriolis flowmeter according to the first aspect, wherein the pair of vibration detection sensors is connected to the second pair of the second sensors. It is configured to be disposed between a driving device and a support having the outflow / inlet.
- the Coriolis flowmeter according to claims 2 and 3 can appropriately select the position where the pair of vibration detection sensors are disposed, and can reduce the Coriolis force acting on the flow tube.
- the proportional phase difference can be detected at a better position.
- a method according to claim 4 The Coriolis flowmeter according to any one of claims 1, 2, and 3, wherein the flow tube comprises a linear portion and a pair of legs connected to both ends of the linear portion.
- the driving device and the pair of second driving devices are arranged along the straight line portion.
- a Coriolis flowmeter provides a Coriolis flowmeter according to any one of the first, second, third, and fourth aspects.
- each of the pair of vibration detection sensors is configured to include a coil and a magnet, and each of the coils is installed on a stationary member parallel to the flow tube. A magnet is installed in the flow tube.
- the vibration beam of the flow tube is set to the tertiary vibration mode, the vibration of the flow tube can be much more stabilized than before. Therefore, there is an effect that it is possible to provide a Coriolis flowmeter capable of obtaining a stable signal through the vibration detection sensor. And at least a curved tube
- the vibration of the flow tube is made more stable. Can be achieved.
- the coil requiring wiring is arranged on the stationary member parallel to the flow tube and the magnet is arranged on the flow tube, the influence on the vibration of the flow tube is obtained. Can be reduced as much as possible.
- FIG. 1 is a perspective view showing one embodiment of a Coriolis flowmeter according to the present invention.
- FIG. 2 is a view showing another embodiment of the Coriolis flowmeter according to the present invention, in which a single curved tube type flow tube is mounted in a vertical plane and viewed from the front. is there.
- FIG. 3 is a diagram of the Coriolis flow meter shown in FIG. 2 as viewed from above.
- FIG. 4 is a cross-sectional view of the Coriolis flow meter shown in FIG. 2 cut in the vicinity of the center.
- FIG. 5 is an operation explanatory view schematically showing a flow tube.
- FIG. 6 (a) is a diagram showing the speed of bending vibration of the flow tube of FIG.
- FIG. 6 (b) is a diagram showing the Coriolis force of the flow tube at the point where the pair of vibration detection sensors shown in FIG. 6 (a) are arranged.
- FIG. 7 is a diagram of the Coriolis flow meter according to the present invention. It is a figure which shows another embodiment, Comprising: It is the figure which attached one curved tube type flow tube in the vertical plane, and was seen from the front. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a first embodiment of a Coriolis flowmeter according to the present invention.
- FIG. 1 is a perspective view showing one embodiment of a Coriolis flowmeter according to the present invention.
- a Coriolis flowmeter 1 in FIG. 1, includes a housing 2, one flow tube 3 housed in the housing 2, and a drive for driving the flow tube 3.
- the apparatus includes a device 4 and a pair of second driving devices 5 and 5, and a pair of vibration detection sensors 6 and 6 for detecting a phase difference proportional to Coriolis force acting on the flow tube 3.
- the housing 2 has a structure that is strong against bending and twisting.
- the housing 2 is formed in a size that can accommodate the flow tube 3 and the stationary member 7 arranged in parallel with the plane formed by the flow tube 3 itself. Further, the housing 2 is formed so as to protect a main part of the flow meter such as the flow tube 3.
- the inside of the housing 2 is filled with an inert gas such as an argon gas. Due to the filling of the inert gas, dew condensation on the flow tube 3 and the like is prevented inside the housing 2.
- the stationary member 7 has, for example, a rectangular shape in a plan view, and is formed in a flat plate shape as illustrated. Further, a part of the stationary member 7 is fixed to the housing 2. To the stationary member 7, block-shaped support portions 8, 8 for supporting and fixing the flow tube 3 are attached and fixed. As described above, the Coriolis flowmeter 1 of the present invention does not amplify disturbance vibration, and has a structure in which vibration is not easily transmitted to the flow tube 3 via the support portions 8.
- the flow tube 3 has a first shaft indicated by S1 shown in FIG. (Corresponds to the vertical axis of the Coriolis flowmeter 1), and is formed by a curved tube that is symmetrical with respect to the vertical axis of the Coriolis flowmeter 1.
- the inlet and outlet sides of the measurement fluid are fixed to the support parts 8, 8. , Is supported.
- the flow tube 3 is formed in a portal shape and has a straight portion 9 and a pair of legs 10, 10 that are continuous with one end of the straight portion 9.
- the flow tube 3 is made of a material commonly used in this technical field, such as stainless steel, Hastelloy, and titanium alloy.
- an inflow-side connection portion 11 and an outflow-side connection portion 12 are attached to the outflow / inflow port of the flow tube 3.
- the measured fluid that has flowed into the flow tube 3 through the inlet-side connection part 11 and the inlet from the direction indicated by the arrow IN in FIG. 1 flows into the inlet leg 10 and the straight line 9 in this order. It flows through the leg 10 on the outlet side, and flows out to the outlet and the connection part 12 on the outlet side (see arrow OUT).
- the driving device 4 is for vibrating the flow tube 3 so as to form a vibration beam in the third vibration mode, and includes a coil and a magnet (not shown). Such a driving device 4 is arranged on the first axis S1, specifically, at the center of the linear portion 9 of the floating tube 3, and is arranged along the center axis of the flow path. Further, the coil of the driving device 4 is attached to the stationary member 7. The magnet of the driving device 4 is attached to the flow tube 3 using, for example, a dedicated attachment.
- the drive tube 4 since the drive tube 4 has the flow tube 3 fixed to the support portions 8 at both ends thereof, the drive tube 4 connects the flow tube 3 to the second shaft S 2 ( Axis parallel to the horizontal axis) And the motor is driven alternately in the rotation direction.
- the pair of second driving devices 5, 5 are each provided with a coil and a magnet, similarly to the driving device 4. Further, the pair of second driving devices 5, 5 are arranged at symmetrical positions on both left and right sides of the driving device 4. In the present embodiment, the pair of second driving devices 5 and 5 are located near the apex of the rising portion and the falling portion of the linear portion 9 of the flow tube 3 and at the center of the flow path of the flow tube 3. They are arranged along an axis. Therefore, the pair of second driving devices 5, 5 and the driving device 4 are arranged in a horizontal line along the straight portion 9 of the flow tube 3. These are arranged at a predetermined interval. Then, each coil of the pair of second driving devices 5, 5 is attached to the stationary member 7. Further, each magnet of the pair of second driving devices 5, 5 is attached to the flow tube 3.
- the pair of second driving devices 5, 5 are set to be driven in the same phase. Also, the pair of second driving devices 5, 5 and the driving device 4 are set to be driven in opposite phases.
- the suction action occurs in the pair of second driving devices 5, 5
- the magnet is in a state of being inserted into the coil.
- the flow tube 3 comes closer to the stationary member 7 (at this time, a repulsive action occurs in the driving device 4).
- the pair of second driving devices 5 and 5 are configured to alternately drive the flow tube 3 in the above-described rotation direction, similarly to the driving device 4.
- the pair of vibration detection sensors 6 As described above, the pair of vibration detection sensors 6
- These sensors detect vibrations with a phase difference proportional to the Coriolis force acting on 3 and are each provided with a coil and a magnet (the configuration of the speed detection method). Further, the pair of vibration detection sensors 6, 6 are arranged at symmetrical positions on the left and right sides of the driving device 4. This pair In the present embodiment, the vibration detection sensors 6 and 6 are provided between the second driving device 5 and the driving device 4 on the inlet side and between the second driving device 5 and the driving device 4 on the outlet side.
- the installation position of the vibration detection sensors 6 and 6 is not limited to this position.
- the pair of vibration detection sensors 6 and 6 when the flow tube 3 is vibrated, the pair of vibration detection sensors 6 and 6 include a portion corresponding to the second driving device 5 on the inflow side and a portion corresponding to the driving device 4. It is installed at a position deviated from a node generated between and a node generated between a portion corresponding to the second driving device 5 and a portion corresponding to the driving device 4 on the outlet side.
- Each coil of the pair of vibration detection sensors 6, 6 is attached to a stationary member 7. Further, each magnet of the pair of vibration detection sensors 6, 6 is attached to the flow tube 3.
- the coils of the pair of second drive devices 5, 5, the drive device 4, and the pair of vibration detection sensors 6, 6, each have an appropriate weight. Since the wiring of a flexible printed circuit (not shown) (not shown) is also required, it is attached to a predetermined position of the stationary member 7. By attaching the coil to the predetermined position of the stationary member 7 in this way, in the first embodiment of the Coriolis flowmeter according to the present invention, the influence on the torsion of the flow tube 3 is reduced as much as possible. .
- the mounting of the coil and the magnet is reversed (the coil is mounted on the flow tube 3 and the magnet is mounted on the stationary member 7), Alternately (for example, the coil of the driving device 4 is attached to the stationary member 7, and the magnet of the driving device 4 is attached to the flow tube 3, and conversely, the pair of second driving devices 5, 5 Attachment of the coil to the flow tube 3 and attachment of the magnets of the pair of second driving devices 5 and 5 to the stationary member 7 do not hinder. Also, regarding mounting the magnet on the flow tube 3 Although not shown in the figure, a dedicated fixture is used.
- FIG. 2 shows a second embodiment of the Coriolis flowmeter according to the present invention.
- FIG. 2 is a view showing one embodiment of the Coriolis flowmeter according to the present invention, and is a view in which one curved tube type flow tube is mounted in a vertical plane and viewed from the front.
- FIG. 3 is a top view of the Coriolis flow meter shown in FIG. 2
- FIG. 4 is a cross-sectional view of the Coriolis flow meter shown in FIG.
- a Coriolis flowmeter 21 according to the second embodiment of the present invention includes a main body 22 forming a housing, a pressure-resistant case 23, and a single housing housed in the housing.
- vibration detection sensors 27 and 27 for detecting.
- the main body 22 is formed in a substantially ship bottom shape having an open upper surface and a U-shaped cross section.
- the main body 2 having such a shape has a structure that is strong against bending and twisting, and has an inflow port at both ends in its longitudinal direction (which corresponds to the horizontal direction in FIG. 2 when viewed in FIG. 2).
- the side connection part 28 and the outlet side connection part 29 are connected.
- the inflow-side connection portion 28 and the outflow-side connection portion 29 are formed so as to communicate between the inside and outside of the main body 22.
- the inlet-side connection part 28 and the outlet-side connection part 29 have an arc part, and the direction of the flow of the measurement fluid can be changed by 90 degrees by the arc part. Is formed.
- Each of the inlet-side connection 28 and the outlet-side connection 29 has a On the outside of the body 22, flanges 30, 30 are mounted in pairs to connect an external flow tube for flowing the measurement fluid. In the present embodiment, it is assumed that the measurement fluid flows in from the left side in FIG. 2 and flows out from the right side.
- a base plate 31 is provided inside the main body 22 and near the upper surface.
- the pressure-resistant case 23 has an opening attached to the upper surface of the main body 22, and has a U-shaped cross section as shown in the figure. Further, the pressure-resistant case 23 is thin and formed so that all the outer circumferences are arc-shaped. The pressure-resistant case 23 having such a shape has a very high pressure resistance even with a thin wall, and even if the flow tube 24 may be damaged, the measurement fluid flowing through the flow tube 24 may be damaged. Care is taken not to flow out of the main body 22 and the pressure-resistant case 23 forming the housing to the outside.
- the pressure-resistant case 23 is fixed to the main body 22 by appropriate means such as welding.
- the housing composed of the main body 22 and the pressure-resistant case 23 can protect the main part of the flow meter such as the flow tube 24.
- the housing composed of the main body 22 and the pressure-resistant case 23 is filled with an inert gas such as argon gas. The filling of the inert gas prevents condensation on the flow tube 24 and the like inside the housing.
- the flow tube 24 is constituted by a curved tube which is symmetrical with respect to the first axis S 1 shown in FIG. 1 (which corresponds to the vertical axis in FIG. 2 when viewed in FIG. 2). It is fixed to the inflow-side connection portion 28 and the outflow-side connection portion 29 of the measurement fluid, and has two openings that are supported, that is, outflow ports. More specifically, the flow tube 24 is formed in a portal shape having a straight portion 32 and a pair of legs 33, 33 continuous at both ends of the straight portion 32. It is fixed to the inflow side connection part 28 and the outflow side connection part 29 via the outflow / inlet.
- the material of the flow tube 24 is stainless steel Materials commonly used in this technical field, such as stainless steel, Hastelloy, and titanium alloy, are used.
- the measurement fluid that has flowed into the float tube 24 from the inlet on the left side of Fig. 2 via the inlet-side connection part 28 flows through the left leg 33, the straight portion 32, and the right leg 33 in this order. Then, it flows out to the outlet side connection part 29 through the outlet on the right side.
- the channel cross-sectional area of the inlet-side connection portion 28 is continuously reduced so as to match the cross-sectional area of the flow tube 24.
- the cross-sectional area of the flow passage of the outlet-side connecting portion 29 is continuously increased from a portion corresponding to the cross-sectional area of the flow tube 24 to match the cross-sectional area of the external flow tube.
- the driving device 25 is for vibrating the flow tube 3 so as to form a vibration beam in the third vibration mode, and includes a coil 34 and a magnet 35.
- a driving device 25 is arranged on the first axis S1. That is, the driving device 25 is arranged at the center position of the linear portion 32 of the flow tube 24 and along the channel center axis.
- the coil 34 of the driving device 25 is attached to a stationary member 36 arranged in parallel with a surface formed by the flow tube 24 itself.
- an FPC Flexible Printed Circuit
- the magnet 35 of the driving device 25 is attached to the flow tube 24 by using, for example, a dedicated attachment.
- the driving device 25 has the flow tube 24 at its both ends. Are connected to the inlet-side connection part 28 and the outlet-side connection part 29, the flow tube 24 is connected to the inlet-side connection part 2'8 and the outlet-side connection part 29. It is configured to alternately drive in a rotational direction around a second axis S 2 (an axis parallel to the horizontal axis in FIG. 2 when viewed in FIG. 2) shown in FIG.
- the support column 37 to which the stationary member 36 arranged parallel to the surface formed by the flow tube 24 itself is a driving device 25, a pair of second driving devices 26, 26, and a pair of vibration detection.
- a temperature sensor (not shown)
- the column 37 is disposed so as to straddle the inside and the outside of the housing.
- a hollow pillar body 38 is attached to the pillar 37, and a board fixing portion 39 is provided at an end of the pillar body 38.
- the board (not shown) is fixed to the board fixing portion 39, and a wire harness (not shown) connected to the board (not shown) passes through the inside of the support body 38 and supports the wire harness (not shown). It is drawn out to outside through 37.
- a part of the column body 38 is sealed together with a wire harness (not shown) by a resin mold or the like.
- the stationary member 36 is formed in a plate shape as shown in FIGS. 2 and 3, and is fixed to, for example, an upper portion of the substrate fixing portion 39.
- the shape of the stationary member 36 is not necessarily limited to a plate shape. That is, the shape of the stationary member 36 depends on the arrangement of the driving device 25, the pair of second driving devices 26, 26, and the pair of vibration detection sensors 27, 27. It is appropriately designed each time.
- the shape shown in FIGS. 2 and 3 is an example of the shape of the stationary member 36.
- the stationary member 36 is not limited to the column 37 and may be directly attached to the main body 2.
- the pair of second drive devices 26 and 26 are each provided with a coil 40 and a magnet 41 similarly to the drive device 25.
- a pair of the first and second driving devices 26 and 26 are provided on the left and right sides of the driving device 25. It is arranged in a symmetrical position on the side.
- the pair of second driving devices 26 and 26 are located near the apex of the rising portion and the falling portion of the linear portion 32 of the flow tube 24 and at the center of the flow path of the flow tube 24. They are arranged along an axis. Therefore, the pair of second driving devices 26, 26 and the driving device 25 are arranged in a horizontal line along the straight portion 32 of the flow tube 24. These are arranged at predetermined intervals.
- the coil 40 is attached to the stationary member 36. Although not shown, an FPC (flexible 'print' circuit) is drawn out of the coil 40 and connected to the substrate (not shown). Further, the magnet 41 is attached to the flow tube 24.
- the pair of second driving devices 26 and 26 are set to be driven in the same phase. Further, the pair of second driving devices 26 and 2'6 and the driving device 25 are set so as to be driven in opposite phases.
- the pair of second driving devices 26 and 26 are set so as to be driven in opposite phases.
- the driving device 25 when a repulsive action occurs in the pair of second driving devices 26 and 26, the flow tube 24 is separated from the stationary member 36 (at this time, The driving device 25 produces a suction effect).
- the pair of second driving devices 26 and 26 are configured to alternately drive the flow tube 24 in the rotation direction, similarly to the driving device 25.
- the pair of vibration detection sensors 27 and 27 are sensors that detect vibrations having a phase difference proportional to the Coriolis force acting on the flow tube 24, and the coils 42 and the magnets are respectively provided. 4 3 (the configuration of the speed detection method). Further, the pair of vibration detection sensors 27 and 27 are arranged at symmetrical positions on the left and right sides of the driving device 25. The pair of vibration detection sensors 27 and 27 are In this state, it is arranged between the left second driving device 26 and the driving device 25 and between the right second driving device 26 and the driving device 25. In addition, in the present embodiment, the pair of vibration detection sensors 27 and 27 are arranged along the center axis of the flow path of the flow tube 24.
- the pair of vibration detecting sensors 27 and 27 are connected to a portion corresponding to the second driving device 26 on the left side and the driving device 25. It is arranged at a position shifted from a node occurring between the corresponding portion and the node occurring between the portion corresponding to the second driving device 26 and the portion corresponding to the driving device 25 on the right side.
- the coils 42 of the pair of vibration detection sensors 27, 27 are attached to the stationary member 36. Although not specifically shown, FPC (flexible printed circuit) is drawn out from each coil 42 of the pair of vibration detection sensors 27 and 27 and connected to the substrate (not shown). Have been. The magnet 43 of each of the pair of vibration detection sensors 27 and 27 is attached to the flow tube 24.
- FPC flexible printed circuit
- a pair of second driving devices 26, 26, a driving device 25, and a pair of coils 34 of a pair of vibration detecting sensors 27, 27 are provided.
- , 40, and 42 are mounted at predetermined positions on the stationary member 36 because they have an appropriate weight and require wiring for the FPC.
- the coil and the magnet may be mounted in a reversed manner (the coil is mounted on the flow tube 24, and the magnet is mounted on the stationary member 36). Or alternately (e.g., attach the coil of the drive unit 25 to the stationary member 36 and attach the magnet of the drive unit 25 to the flow tube).
- the coils of the pair of second driving devices 26 and 26 are mounted on the flow tube 24 and the magnets of the pair of second driving devices 26 and 26 are stationary. It does not prevent attachment to the member 36).
- a dedicated mounting tool is used for mounting the magnet to the flow tube 24.
- a temperature sensor (not shown) is for compensating the temperature of the Coriolis flow meter 21 and is connected to the flow tube 24 by appropriate means. Installed. Specifically, this temperature sensor (not shown) is attached, for example, near a portion fixed to the inlet-side connection portion 28. An FPC (flexible print circuit kit) or an electric wire drawn from the temperature sensor is connected to the substrate.
- FPC flexible print circuit kit
- a measurement fluid is passed through a flow tube 3 (flow tube 24).
- the driving device 4 and the pair of second driving devices 5 and 5 (the driving device 25 and the pair of second driving devices 26 and 26) are driven so that the repulsive action is continuously and alternately repeated.
- the pair of second driving devices 5 and 5 (the pair of second driving devices 26 and 26) are in phase, and the pair of second driving devices 5 and 5 (the pair of second driving devices 26 and 26)
- the driving device 4 (the driving device 25) is driven in the opposite phase.
- the flow tube 3 bends and vibrates so as to form a tertiary vibration mode vibration beam as shown by the solid line and the broken line in FIG.
- the point of Dr 1 shown in FIG. 5 is the arrangement of the driving device 4 (driving device 25), and the points of Dr 2 to Dr 3 shown in FIG. 5 are the pair of second driving devices 5 and 5 ( —Arrangement of the pair of second drives 26, 26), PO shown in Fig. 5
- Points 1 to PO 2 indicate the arrangement of a pair of vibration detection sensors 6 and 6 (a pair of vibration detection sensors 27 and 27), respectively.
- Points 0 'and 0 "shown in FIG. 5 indicate nodes of vibration.
- FIG. 6 (a) shows the bending vibration velocity of the flow tube 3 (the professional tube 24) vibrating in this manner.
- FIG. 6 (b) shows a point PO corresponding to a point where the pair of vibration detection sensors 6, 6 (a pair of vibration detection sensors 27, 27) shown in FIG. 6 (a) are arranged. Arrows indicate the Coriolis forces at 1-PO2.
- the mass flow rate is calculated by the difference between the Coriolis forces at points PO 1 and PO 2 (PO 1—P 02).
- a pair of vibration detection sensors 6 and 6 (—a pair of vibration detection sensors 2 7 , 27) is converted to a position signal by a converter (not shown) to determine the phase difference, which is displayed as mass flow rate).
- the Coriolis flow meter 1 according to the first embodiment of the present invention and the Coriolis flow meter 21 according to the second embodiment of the present invention 1 According to this, it can be configured in a simple shape, can be provided at a relatively low cost, and is driven in the tertiary vibration mode, so that it has an effect of being resistant to disturbance vibration. Further, according to the Coriolis flow meter 1 and the Coriolis flow meter 21 of the present invention, the driving device 4 (without the pair of second driving devices 5 and 5 (the pair of second driving devices 26 and 26)) is provided. Compared to the mass flow meter with only the drive device 25) (conventional mass flow meter), the flow tube 3 (flow tube 24)
- FIG. 7 shows a third embodiment of the Coriolis flowmeter according to the present invention.
- FIG. 7 is a diagram showing an embodiment of the Coriolis flowmeter according to the present invention, in which one curved tube type flow tube is mounted in a vertical plane and viewed from the front. is there.
- the Coriolis flow meter 21 of the present invention according to the third embodiment is different from the Coriolis flow meter 21 of the second embodiment described above in that it is the Coriolis flow meter of the second embodiment.
- the only difference is that a pair of vibration detection sensors 27 and 27 are arranged at different positions from 21. That is, in the third embodiment of the Coriolis flowmeter according to the present invention, the pair of vibration detection sensors 27 and 27 are a left driving device 26 on the left side and an inflow port on the left side of the flow tube 24. And between the second driving device 26 on the right side and the outlet on the right side of the flow tube 24.
- the respective coils of the pair of vibration detection sensors 27 and 27 are attached to, for example, a stationary member 36 ′ fixed to the substrate fixing portion 39.
- FPCs Flexible Printed Circuits
- drawn from the respective coils of the pair of vibration detection sensors 27 and 27 are connected to a substrate.
- each magnet of the pair of vibration detection sensors 27 and 27 is attached to the flow tube 24 via an attachment.
- the Coriolis flow meter 21z configured in this way can be configured in a simple shape, like the Coriolis flow meter 1 of the first embodiment and the Coriolis flow meter 21 of the second embodiment described above. It has the effect of being able to provide at a reasonable price.
- the driving device 4 (the driving device) is not provided without the pair of the second driving devices 5 and 5 (the pair of first driving devices: 26 and 26). Compared to a mass flow meter with only 25) (conventional mass flow meter), it has the effect that the vibration of flow tube 3 (flow tube 24) can be remarkably stabilized. .
- the present invention can be implemented with various designs changed without departing from the spirit of the present invention.
- the shape of the flow tubes 3 and 24 is a portal shape.
- the shape of the flow tubes 3 and 24 is not limited to the portal shape. It can be a curved tube of any shape such as a letter shape.
- the number of the flow tubes 3 and 24 is taken as an example of one embodiment, but the number of the flow tubes 3 and 24 is not limited to one. It can be two in parallel.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04760748A EP1693653B1 (en) | 2003-12-02 | 2004-09-24 | Coriolis flowmeter |
US10/581,243 US7506551B2 (en) | 2003-12-02 | 2004-09-24 | Coriolis flowmeter having a drive device driven in reverse phase to pair of second drive devices |
DE602004018977T DE602004018977D1 (de) | 2003-12-02 | 2004-09-24 | Coriolis-strömungsmesser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-403065 | 2003-12-02 | ||
JP2003403065A JP3783959B2 (ja) | 2003-12-02 | 2003-12-02 | コリオリ流量計 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005054791A1 true WO2005054791A1 (ja) | 2005-06-16 |
Family
ID=34650052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/014454 WO2005054791A1 (ja) | 2003-12-02 | 2004-09-24 | コリオリ流量計 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7506551B2 (ja) |
EP (1) | EP1693653B1 (ja) |
JP (1) | JP3783959B2 (ja) |
KR (1) | KR100848769B1 (ja) |
CN (1) | CN100429489C (ja) |
DE (1) | DE602004018977D1 (ja) |
WO (1) | WO2005054791A1 (ja) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5086814B2 (ja) * | 2008-01-07 | 2012-11-28 | 株式会社キーエンス | 流量計 |
CN102037336A (zh) * | 2008-05-09 | 2011-04-27 | 微动公司 | 具有作为用于驱动器构件和传感器构件的支撑部的中心固定板的双管科里奥利流量计 |
RU2467292C2 (ru) * | 2008-05-09 | 2012-11-20 | Майкро Моушн, Инк. | Кориолисов расходомер с двойной трубой и центральной закрепленной пластиной, служащей в качестве опоры для возбудителя и компонентов датчиков |
US8667852B2 (en) | 2009-05-11 | 2014-03-11 | Micro Motion, Inc. | Flow meter including a balanced reference member |
BRPI0924909B1 (pt) | 2009-06-30 | 2019-10-29 | Micro Motion Inc | conjunto de sensor vibratório, e, método para formar um medidor de fluxo |
DE102012018988A1 (de) * | 2012-09-27 | 2014-04-17 | Krohne Ag | Coriolis-Massedurchflussmessgerät |
US9368264B2 (en) * | 2014-09-08 | 2016-06-14 | Micro Motion, Inc. | Magnet keeper assembly and related method |
NL2016092B1 (en) * | 2016-01-14 | 2017-07-24 | Berkin Bv | Coriolis flowsensor. |
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 |
CN107462293A (zh) * | 2017-07-25 | 2017-12-12 | 大连美天测控系统有限公司 | 质量流量计 |
JP7004810B2 (ja) * | 2017-11-02 | 2022-01-21 | マイクロ モーション インコーポレイテッド | コンパクトな振動式流量計 |
DE102017012058A1 (de) | 2017-12-28 | 2019-07-04 | Endress+Hauser Flowtec Ag | Messgerät vom Vibraationstyp mit einem Messrohr |
DE102018110495B4 (de) * | 2018-05-02 | 2021-02-18 | Endress+Hauser Flowtec Ag | Coriolis-Messaufnehmer mit einer messrohrtorsionskompensierenden Sensorgruppe und ein Coriolis-Messgerät mit einem solchen Messaufnehmer |
DE102021123412A1 (de) | 2021-09-09 | 2023-03-09 | Endress+Hauser Flowtec Ag | Vibronischer Messaufnehmer zur Massedurchfluss- und Dichtemessung |
Citations (4)
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JPH0882541A (ja) * | 1994-09-12 | 1996-03-26 | Yokogawa Electric Corp | コリオリ質量流量計 |
JPH1123341A (ja) * | 1997-07-08 | 1999-01-29 | Yokogawa Electric Corp | コリオリ質量流量計 |
JP2884796B2 (ja) * | 1991-02-27 | 1999-04-19 | 横河電機株式会社 | コリオリ質量流量計 |
US5907104A (en) | 1995-12-08 | 1999-05-25 | Direct Measurement Corporation | Signal processing and field proving methods and circuits for a coriolis mass flow meter |
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US5497666A (en) * | 1994-07-20 | 1996-03-12 | Micro Motion, Inc. | Increased sensitivity coriolis effect flowmeter using nodal-proximate sensors |
US5926096A (en) * | 1996-03-11 | 1999-07-20 | The Foxboro Company | Method and apparatus for correcting for performance degrading factors in a coriolis-type mass flowmeter |
US5734112A (en) * | 1996-08-14 | 1998-03-31 | Micro Motion, Inc. | Method and apparatus for measuring pressure in a coriolis mass flowmeter |
US6092429A (en) * | 1997-12-04 | 2000-07-25 | Micro Motion, Inc. | Driver for oscillating a vibrating conduit |
US6412354B1 (en) * | 1999-12-16 | 2002-07-02 | Halliburton Energy Services, Inc. | Vibrational forced mode fluid property monitor and method |
US7168329B2 (en) * | 2003-02-04 | 2007-01-30 | Micro Motion, Inc. | Low mass Coriolis mass flowmeter having a low mass drive system |
US7051598B2 (en) * | 2003-03-21 | 2006-05-30 | Endress + Hauser Flowtec Ag | Magnetic circuit arrangement for a sensor |
-
2003
- 2003-12-02 JP JP2003403065A patent/JP3783959B2/ja not_active Expired - Fee Related
-
2004
- 2004-09-24 DE DE602004018977T patent/DE602004018977D1/de active Active
- 2004-09-24 CN CNB2004800358622A patent/CN100429489C/zh not_active Expired - Fee Related
- 2004-09-24 US US10/581,243 patent/US7506551B2/en not_active Expired - Fee Related
- 2004-09-24 WO PCT/JP2004/014454 patent/WO2005054791A1/ja active Application Filing
- 2004-09-24 EP EP04760748A patent/EP1693653B1/en not_active Not-in-force
- 2004-09-24 KR KR1020067010723A patent/KR100848769B1/ko not_active IP Right Cessation
Patent Citations (4)
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JP2884796B2 (ja) * | 1991-02-27 | 1999-04-19 | 横河電機株式会社 | コリオリ質量流量計 |
JPH0882541A (ja) * | 1994-09-12 | 1996-03-26 | Yokogawa Electric Corp | コリオリ質量流量計 |
US5907104A (en) | 1995-12-08 | 1999-05-25 | Direct Measurement Corporation | Signal processing and field proving methods and circuits for a coriolis mass flow meter |
JPH1123341A (ja) * | 1997-07-08 | 1999-01-29 | Yokogawa Electric Corp | コリオリ質量流量計 |
Non-Patent Citations (1)
Title |
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See also references of EP1693653A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR100848769B1 (ko) | 2008-07-28 |
DE602004018977D1 (de) | 2009-02-26 |
CN100429489C (zh) | 2008-10-29 |
CN1890536A (zh) | 2007-01-03 |
EP1693653A4 (en) | 2006-11-22 |
JP2005164374A (ja) | 2005-06-23 |
KR20060123760A (ko) | 2006-12-04 |
EP1693653B1 (en) | 2009-01-07 |
US20070095151A1 (en) | 2007-05-03 |
US7506551B2 (en) | 2009-03-24 |
JP3783959B2 (ja) | 2006-06-07 |
EP1693653A1 (en) | 2006-08-23 |
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