JP4033304B2 - Coriolis flow meter with two V-shaped tube forming surfaces - Google Patents

Description

  The present invention relates to a Coriolis flow meter for obtaining a mass flow rate and / or density of a fluid to be measured, and more specifically, a single flow tube for flowing the fluid to be measured is looped in a double loop, and two flow tubes are used by the flow tube. The present invention relates to a Coriolis flow meter formed with a tube forming surface.

  A Coriolis flowmeter supports one or both ends of a flow tube through which a fluid to be measured flows, and when vibration is applied in a direction perpendicular to the flow direction of the flow tube around the support point, This is a mass flow meter utilizing the fact that the Coriolis force acting on the flow tube to be added is called a flow tube) is proportional to the mass flow rate. Coriolis flowmeters are well known, and the shape of the flow tube in the Coriolis flowmeter is roughly divided into a straight tube type and a curved tube type.

  The straight pipe type Coriolis flowmeter is a straight pipe that is supported by the Coriolis force between the straight pipe support section and the center section when vibration is applied in the direction perpendicular to the straight pipe axis of the straight pipe center supported at both ends. A displacement difference of the tube, 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 type Coriolis flowmeter has a simple, compact and robust structure. However, it also has a problem that high detection sensitivity cannot be obtained.

  On the other hand, the curved tube type Coriolis flow meter is superior to the straight tube type Coriolis flow meter in that it can select the shape to effectively extract the Coriolis force. Can be detected. In addition, as a curved tube type Coriolis flowmeter, one provided with one flow tube (see, for example, Patent Document 1), one provided with two flow tubes in parallel (see, for example, Patent Document 2), or one There are known ones provided in a state in which a flow tube is looped (see, for example, Patent Document 3).

8 and 9, in the Coriolis flow meter of Patent Document 3 below in which one flow tube 101 is double-looped, the flow tube 101 is bent with the first bent tube portion 102 and the second bent tube portion 103. And a tube portion 104. The first bending tube portion 102 and the second bending tube portion 103 include a tube forming surface 105 (a surface formed along a virtual line in the drawing) formed by the first bending tube portion 102 and a second bending tube portion. The tube forming surfaces 106 formed by 103 are arranged in parallel with each other. The bending tube portion 104 is disposed and formed so as to exist between the first bending tube portion 102 and the second bending tube portion 103 in order to connect the first bending tube portion 102 and the second bending tube portion 103. Yes. The bent tube portion 104 is bent and formed as shown in the figure.
Japanese Examined Patent Publication No. 4-55250 Japanese Patent No. 2939242 Japanese Patent Publication No. 5-69453

  In the above prior art, since the bent tube portion 104 has a structure existing between the first bent tube portion 102 and the second bent tube portion 103, the first bent tube portion 102 and the second bent tube portion 103 are arranged. The flow tube 101 is formed so that the interval is relatively wide. As a result, the following problems arise from the arrangement of the drive means for driving the flow tube 101 and the detection means for detecting the phase difference and / or vibration frequency proportional to the Coriolis force acting on the flow tube 101. Dots have occurred.

  That is, since the coils and magnets constituting the driving means and the detection means need to be arranged close to each other, in the case of wide intervals such as the first bending tube portion 102 and the second bending tube portion 103, A dedicated holding member for holding the coil and the magnet must be formed large, and as a result, the weight of the portion where the driving means and the detecting means are present increases, and the S / N ratio decreases. The problem has arisen.

  This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the Coriolis flowmeter which can aim at the improvement of S / N ratio.

  The Coriolis flowmeter having two V-shaped tube forming surfaces according to the present invention according to the first aspect of the present invention, which has been made in order to solve the above-mentioned problems, is obtained by looping a single flow tube for flowing a fluid to be measured. In the Coriolis flow meter in which two tube forming surfaces are formed by the flow tube, the two tube forming surfaces are arranged so as to be substantially V-shaped with the tube driving side opened at a predetermined interval. The opposite side of the tube drive side is formed as a part that is fixed.

  According to the present invention having such a feature, the two tube forming surfaces formed on the flow tube are arranged in a substantially V shape. That is, the Coriolis flowmeter is provided with a flow tube in which the tube driving side of the two tube forming surfaces opens at a predetermined interval and the opposite side of the tube driving side is in a fixed state.

  According to the present invention, since the two tube forming surfaces are arranged in a substantially V shape, in other words, the two tube forming surfaces are arranged with an arbitrary angle θ. The angle θ is an acute angle and is determined by the shape of the drive means and detection means arranged between the two tube forming surfaces. Specifically, the angle θ is set such that, for example, coils and magnets constituting the drive unit and the detection unit are close to each other by the minimum holding member. As a result, the weight of the portion where the drive means and the detection means are present is reduced, and the measurement result is minimized.

  The fact that the two tube forming surfaces are arranged in a substantially V shape means that the tube portion common to the two tube forming surfaces does not bend. Thereby, it contributes to the downsizing of the manufacturing surface of the flow tube and the flow tube itself.

  According to the present invention, since there is a portion that is in a fixed state, a bending mode vibration is generated around the axis of the portion that is in the fixed state. When a bending mode vibration is generated in the flow tube by driving the driving means, the stress accompanying this vibration is converted into the axial twist. The vibrations of noise components that occur with each other are cancelled.

  The Coriolis flowmeter having two V-shaped tube forming surfaces of the present invention according to claim 2 is the Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 1, wherein Arrange the tube part on the inlet side and the tube part on the outlet side in contact with the tube part common to the two tube forming surfaces, and collect the predetermined range of these three tube parts at once. In this case, a portion to be in the above-mentioned fixed state is formed by fixing.

  According to the present invention having such a feature, the side opposite to the tube driving side is in a state of being fixed on one shaft. If the two tube forming surfaces are fixed on one shaft, the change in the vibration trajectory of the two tube forming surfaces when the driving means is driven is reduced.

  The Coriolis flowmeter having two V-shaped tube forming surfaces of the present invention according to claim 3 is the Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 1 or 2, The axis connecting the inflow port and the outflow port and the axis of the portion in the fixed state are arranged in a substantially parallel state or a substantially coincident state.

  According to the present invention having such characteristics, the flow tube has a shape extending in the axial direction connecting the inflow port and the outflow port. Thereby, it contributes to the manufacturing down of a flow tube, the size reduction of the flow tube itself, etc.

  The Coriolis flowmeter having two V-shaped tube forming surfaces of the present invention according to claim 4 is the Coriolis flowmeter having two V-shaped tube forming surfaces according to any one of claims 1 to 3. A rigid body is attached to the portion that is in the fixed state.

  According to the present invention having such a feature, when the driving means is driven, a bending mode vibration is generated around the axis of the portion that is in a fixed state in the flow tube. This bending mode vibration is further stabilized by the presence of a rigid body. When the mass of the rigid body is increased, the vibration is further stabilized.

  The Coriolis flowmeter having two V-shaped tube forming surfaces of the present invention according to claim 5 is the Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 4, wherein the rigid body is It is characterized in that it is formed in a split type that allows the portion in the fixed state to be freely attached and detached.

  According to the present invention having such characteristics, the rigid body is disassembled when maintenance of the flow tube is required. Thereby, the flow tube can be removed.

  According to the first aspect of the present invention, there is an effect that a Coriolis flow meter capable of improving the S / N ratio can be provided. In addition, according to the present invention, it is possible to reduce the change in the vibration trajectory of the two tube forming surfaces. In addition, according to the present invention described in claim 3, there is an effect that it is possible to contribute to the production reduction of the flow tube, the size reduction of the flow tube itself, and the like.

  Further, according to the present invention described in claim 4, there is an effect that vibration generated in the flow tube can be stabilized. Further, according to the present invention described in claim 5, there is an effect that it is possible to facilitate the work of removing the flow tube at the time of maintenance.

Hereinafter, description will be given with reference to the drawings.
1A and 1B are views showing an embodiment of a Coriolis flowmeter having two V-shaped tube forming surfaces according to the present invention, wherein FIG. 1A is a perspective view of a flow tube, and FIG. It is the figure which showed the surface typically. 2 is a perspective view of the flow tube, FIG. 3 is a view in the direction of A in FIG. 1, FIG. 4 is a perspective view (including a cross section) of a portion in a fixed state, and FIG. FIG. 5B is a schematic diagram showing a change in the vibration trajectory of the comparative example. In the figure, only the main part of the Coriolis flowmeter of the present invention is shown, and the others are omitted.

  In FIG. 1, a Coriolis flow meter 1 of the present invention includes a housing 2 and a flow tube 3 housed in the housing 2. Further, the Coriolis flowmeter 1 of the present invention includes a drive unit 4, a pair of vibration detection sensors 5, 5 and a sensor unit (not shown) having a temperature sensor (not shown), and a signal from the sensor unit. A signal calculation processing unit (not shown) that performs calculation processing of the mass flow rate and the like based on this, and an excitation circuit unit (not shown) for exciting the drive device 4 are configured. The Coriolis flow meter 1 according to the present invention is characterized by the shape of the flow tube 3 and is improved in S / N ratio as compared with the conventional one. Hereinafter, each component will be described with reference to FIGS. 1 to 4.

  The housing 2 has a structure that is strong against bending and twisting. The housing | casing 2 is formed so that main parts of flowmeters, such as the flow tube 3, can be protected. The inside of the housing 2 is filled with an inert gas such as argon gas. By filling with the inert gas, dew condensation on the flow tube 3 and the like is prevented.

  The flow tube 3 is formed by double looping a single flow tube for measurement. That is, the flow tube 3 is formed in a shape as shown in the figure having a first bending tube portion 6 and a second bending tube portion 7 continuous thereto. In addition to the first bending tube portion 6 and the second bending tube portion 7, the flow tube 3 includes an inflow tube 8 that is continuous with the first bending tube portion 6 and an outflow tube 9 that is continuous with the second bending tube portion 7. Have.

  The first bending tube portion 6 and the second bending tube portion 7 are each formed in an annular shape and arranged in a substantially V shape. Here, the arrangement of the first bending tube portion 6 and the second bending tube portion 7 will be described more specifically. First, a surface formed by the first bending tube portion 6 is a first tube forming surface 10, and a surface formed by the second bending tube portion 7 is a second tube forming surface 11. These two first and second tube forming surfaces 10 and 11 are arranged with an angle θ as shown in FIG. The fact that the two first and second tube forming surfaces 10 and 11 are arranged with an angle θ means that the two first and second tube forming surfaces 10 and 11 are arranged in a substantially V shape. become. Therefore, the 1st bending pipe part 6 and the 2nd bending pipe part 7 will be arrange | positioned in a substantially V shape (refer also FIG. 3 also about the substantially V-shaped arrangement | positioning).

  Note that the angle θ is an acute angle, and is arbitrarily determined depending on the shapes of the drive device 4 and the vibration detection sensors 5 and 5 (respective coils and magnets constituting the drive device 4 and the vibration detection sensors 5 and 5). It is assumed that the angle θ is set such that the two approach each other in a state where the smallest holding member is used.

  When the arrow line P in FIG. 1 is defined as the vertical direction and the arrow line Q is defined as the horizontal direction, the first bending tube portion 6 and the second bending tube portion 7 are both formed in a substantially rectangular shape extending in the horizontal direction. (It is assumed to be an example. An approximately rectangular shape extending in the vertical direction, an approximately elliptical shape, or an approximately circular shape is also possible). The first bending tube portion 6 and the second bending tube portion 7 have a common tube portion 12 that is common to the two. The common tube portion 12 is a portion corresponding to a continuous portion of the first bending tube portion 6 and the second bending tube portion 7 and is formed straight.

  In the first bent tube portion 6 and the second bent tube portion 7, reference numerals 13 and 13 indicate drive side tube portions. The drive side tube portions 13 and 13 are formed to be parallel to each other. The drive side tube portions 13 and 13 are formed straight. The center of the drive side tube portions 13, 13 is an attachment position for the drive device 4.

  The connecting portions with the tube portions 14 and 14 in the vertical direction at both ends of each drive side tube portion 13 are attachment positions with respect to the vibration detection sensors 5 and 5. The drive device 4 and the vibration detection sensors 5 and 5 are set to be attached at the same height from the position of the common tube portion 12.

  In FIG. 2, reference numerals 15 and 15 indicate the fixing side tube portion. The adhering side tube portions 15 and 15 are formed so as to be parallel to and in contact with the common tube portion 12. The adhering side tube portions 15 and 15 are arranged on both sides of the common tube portion 12. Such adhering side tube portions 15 and 15 are welded to the common tube portion 12. Reference numeral 16 indicates a welded portion. FIG. 4 shows a state in which the common tube portion 12 and the fixed-side tube portions 15 and 15 are welded together, and the three tubes are rigidly connected. A fixed state portion 17 is formed. FIG. 4 is an enlarged view of the fixed portion 17.

  In FIG. 2, the range H of the welded portion 16 is set to be shorter than the horizontal lengths of the first bent tube portion 6 and the second bent tube portion 7. It should be noted that the range H of the welded portion 16 is a range in which bending mode vibration (described later) occurs, and the stress accompanying this vibration is converted into the twist of the common tube portion 12 and the fixing side tube portions 15 and 15. If there is no particular limitation. A portion 17 in a fixed state is formed in the range H by the welded portion 16.

  The inflow pipe 8 continuing to the first curved pipe section 6 has an inlet (not shown) of the flow tube 3 at one end. In addition, the inflow pipe 8 has a portion continuing to the fixed tube portion 15 at the other end. The inflow pipe 8 is formed such that a portion continuous with the adhering side tube portion 15 is bent. The other portions are formed straight.

  The outflow pipe 9 continuing to the second curved pipe section 7 has an outlet (not shown) of the flow tube 3 at one end. Further, the outflow pipe 9 has a portion at the other end continuous to the adhering side tube portion 15. The outflow pipe 9 is formed such that a portion continuous with the fixed-side tube portion 15 is bent (bends so as to straddle the lower side of the common tube portion 12 and the other fixed-side tube portion 15). The other portions are formed straight.

  The straight portions of the inflow pipe 8 and the outflow pipe 9 are arranged so as to be coaxial. Here, the axis connecting the inflow pipe 8 and the outflow pipe 9 is arranged so as to be substantially parallel to the axis of the portion 17 in a fixed state (for example, the central axis of the common tube portion 12). And).

  The material of the flow tube 3 is a normal material in this technical field such as stainless steel, hastelloy, titanium alloy and the like.

  The driving device 4 constituting the sensor unit is for causing the first bending tube portion 6 and the second bending tube portion 7 of the flow tube 3 to vibrate oppositely, and includes a coil 18 and a magnet 19. Has been. Such a drive device 4 is attached to the center of the drive side tube portions 13 and 13 of the flow tube 3 so as to be sandwiched between them. The driving device 4 is attached so that the coil 18 and the magnet 19 are close to each other with the minimum holding member (reference numeral omitted).

  The operation of the drive device 4 will be described. When an attracting action is generated in the drive device 4, the magnet 19 is inserted into the coil 18, and as a result, the drive side tube portions 13 and 13 of the flow tube 3 come close to each other. On the other hand, when the repulsion occurs, the drive side tube portions 13 and 13 are separated from each other. Since the drive device 4 has the portion 17 in which the flow tube 3 is fixed, the drive device 4 is configured to be driven alternately in the rotation direction around the portion 17 in the fixed state.

  The vibration detection sensors 5 and 5 constituting the sensor unit are sensors for detecting the vibration of the flow tube 3 and detecting a phase difference proportional to the Coriolis force acting on the flow tube 3, respectively. It comprises a coil 20 and a magnet 21 (not limited to this, but detects any of displacement, velocity, acceleration, such as an acceleration sensor, optical means, capacitance type, distortion type (piezo type), etc. Any means).

  The vibration detection sensors 5 and 5 having such a configuration are connected to the tube portions 14 and 14 in the vertical direction at both ends of each drive side tube portion 13 of the flow tube 3 (an example is assumed. Any other position can be used as long as it can detect a proportional phase difference. The vibration detection sensors 5 and 5 are attached so that the coil 20 and the magnet 21 approach each other in a state where a minimum holding member (reference numeral is omitted) is used.

  Although not particularly illustrated, a substrate or the like is provided inside the Coriolis flow meter 1 of the present invention. A wire harness drawn out of the housing 2 and, for example, electric wires from the driving device 4 and the vibration detection sensors 5 and 5 are connected to the substrate.

  The temperature sensor constituting a part of the sensor unit is a sensor for compensating the temperature of the Coriolis flow meter 1 and is attached to the flow tube 3 by an appropriate means. As a specific arrangement, for example, the inflow pipe 8 is suitable. An electric wire (not shown) drawn from the temperature sensor is connected to the substrate.

  The signal calculation processing unit includes a detection signal from one vibration detection sensor 5 regarding the deformation of the flow tube 3, a detection signal from the other vibration detection sensor 5 regarding the deformation of the flow tube 3, and a temperature sensor. Wiring and connection are made so that detection signals relating to the temperature of the flow tube 3 are input. Such a signal calculation processing unit is configured to calculate the mass flow rate and the density based on each detection signal input from the sensor unit. The signal calculation processing unit is configured to output the mass flow rate and density obtained by the calculation to a display (not shown).

  The excitation circuit unit includes a smoothing unit, a comparison unit, a target setting unit, a variable amplification unit, and a drive output unit. The smoothing unit is wired so as to take out a detection signal from one vibration detection sensor 5 (or the other vibration detection sensor 5), rectifies and smoothes the input detection signal, and applies a DC voltage proportional to the amplitude thereof. It has a function that can output. The comparison unit can compare the DC voltage from the smoothing unit with the target setting voltage output from the target setting unit, and can control the amplitude of the resonance vibration to the target setting voltage by controlling the gain of the variable amplification unit. It has such a function.

  In the above configuration, when the fluid to be measured flows through the flow tube 3 and the driving device 4 is driven to vibrate the first bending tube portion 6 and the second bending tube portion 7 of the flow tube 3, the vibration detection sensor 5, The mass flow rate is calculated by the signal calculation processing unit based on the phase difference generated by the Coriolis force at the point 5. The density is also calculated from the vibration frequency.

  The flow tube 3 includes the first bent tube portion 6 and the second bent tube portion 7 arranged in a substantially V shape, and has a portion 17 that is in a fixed state. Bending mode vibration occurs at the center. When the vibration of the bending mode is generated in the flow tube 3 by the drive of the driving means 4, the stress accompanying this vibration is converted into the twist in the axial direction. The vibrations of noise components that occur with each other are cancelled.

  According to the Coriolis flow meter 1 of the present invention, as can be seen from the above structure, the weight of the portion where the drive means 4 and the vibration detection sensors 5 and 5 are present is reduced. Can be improved.

  Moreover, according to the Coriolis flow meter 1 of the present invention, the first bent tube portion 6 and the second bent tube portion 7 of the flow tube 3 are arranged in a substantially V shape and have a fixed state portion 17 that is fixed. Therefore, as shown in FIG. 5A, the size of the cross (described later) of the vibration trajectory 22 can be reduced and the change can be reduced. In addition, since the common tube portion 12 and the adhering side tube portions 15 and 15 are integrated, the bending resistance is controlled and a phase difference signal having a high S / N ratio can be obtained (reason: in the past). Since, as shown in FIG. 5 (b), the first bent tube portion and the second bent tube portion of the flow tube 3 are arranged in a non-V shape, and the base end is fixed to a position away from the base tube, The two vibration surfaces shown in Fig. 5B vibrate independently of each other, so that the vibration trajectories 23, 23 of the two vibration surfaces are inside the first bending tube portion and the second bending tube portion, and In the conventional vibration state, the crossing and change of the vibration trajectories 23 and 23 are increased due to the behavior of the fluid, which affects the measurement result).

  Next, another example will be described with reference to FIG. FIG. 6 is a perspective view showing an example in which a rigid body is provided in a portion to be fixed.

  In FIG. 6, the portion 17 in which the flow tube 3 is fixed is held by a rigid body 24 including an upper rigid body 25 and a lower rigid body 26, which will be described later. The rigid body 24 is a metal member having a sufficient mass, and is formed in a split type that allows the portion 17 in a fixed state to be freely attached and detached. That is, the rigid body 24 includes, for example, two members having an upper rigid body 25 and a lower rigid body 26 as shown in the drawing, and a plurality of fixing members (not shown) such as screws for fixing the upper rigid body 25 and the lower rigid body 26. It is prepared for.

  Three straight grooves 27 are formed on the opposing surfaces of the upper rigid body 25 and the lower rigid body 26. The groove 27 is formed in accordance with the shape of the portion 17 to be fixed. The portion 17 that is in a fixed state is sandwiched and held via the groove 27.

  The lower rigid body 26 is fixed to the housing 2. The lower rigid body 26 may be integrated with the housing 2.

  In the above configuration, when the rigid body 24 is attached to the portion 17 that is in a fixed state, the mass of the portion 17 that is also in the fixed state is increased by the attached rigid body 24. Therefore, the example of FIG. 6 has an advantage that the bending mode vibration is further stabilized by the attachment of the rigid body 24.

  Next, still another example will be described with reference to FIG. FIG. 7 is a perspective view showing an example in which the axis connecting the inflow port and the outflow port and the axis of the portion in the fixed state are arranged in a substantially coincident state.

  In the above-described example (the example of FIGS. 1 to 4), the axis connecting the inflow pipe 8 and the outflow pipe 9 is arranged so as to be substantially parallel to the axis of the portion 17 in the fixed state. Then, it may be arranged in a state as shown in FIG. That is, it is also possible to use an arrangement in which the axis connecting the inflow pipe 8 and the outflow pipe 9 and the axis of the portion 17 in a fixed state are arranged in a substantially coincident state. As can be seen from FIG. 7, there is an advantage that the bent state of the portion continuing to the adhering side tube portion 15 becomes gentler than the above example.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

It is a figure which shows one Embodiment of the Coriolis flowmeter which has two V-shaped tube formation surfaces based on this invention, (a) is a perspective view of a flow tube, (b) is a model of two tube formation surfaces. FIG. It is a perspective view of a flow tube. It is a figure of A viewing direction of FIG. It is a perspective view (a cross section is included) of the part used as the adhering state. (A) is a schematic diagram which shows the change of the vibration locus of two tube formation surfaces, (b) is a schematic diagram which shows the change of the vibration locus of a comparative example. It is a perspective view which shows the example which provided the rigid body in the part used as the adhering state. It is a perspective view which shows the example which has arrange | positioned the axis | shaft which connects an inflow port and an outflow port, and the axis | shaft of the part used as a fixation state in a substantially identical state. It is a perspective view which shows the flow tube of the Coriolis flowmeter of a prior art example. It is a top view of the flow tube of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coriolis flowmeter 2 Housing | casing 3 Flow tube 4 Drive apparatus 5 Vibration detection sensor 6 1st curved pipe part 7 2nd curved pipe part 8 Inflow pipe 9 Outflow pipe 10 1st tube formation surface 11 2nd tube formation surface 12 Common tube Part 13 Drive side tube part 14 Vertical tube part 15 Adhering side tube part 16 Welding part 17 Part to be fixed 18, 20 Coil 19, 21 Magnet 22, 23 Vibration locus 24 Rigid body 25 Upper rigid body 26 Lower rigid body 27 Groove

Claims (5)

In a Coriolis flowmeter formed by looping a single flow tube for flowing a fluid to be measured, and forming two tube forming surfaces with the flow tube,
The two tube forming surfaces are arranged so as to be substantially V-shaped with the tube driving side opened at a predetermined interval, and in this arrangement state, the opposite side of the tube driving side is formed as a part that is fixed. Coriolis flowmeter having two V-shaped tube forming surfaces. The Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 1,
The tube portion on the inlet side and the tube portion on the outlet side of the flow tube and the tube portion common to the two tube forming surfaces are arranged in contact with each other. A Coriolis flowmeter having two V-shaped tube-forming surfaces, wherein the portion that becomes the fixed state is formed by fixing the range collectively. In the Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 1 or 2,
A Coriolis flowmeter having two V-shaped tube forming surfaces, wherein an axis connecting the inflow port and the outflow port and an axis of the portion in the fixed state are arranged in a substantially parallel or substantially coincident state. . In the Coriolis flowmeter having two V-shaped tube forming surfaces according to any one of claims 1 to 3,
A Coriolis flowmeter having two V-shaped tube-forming surfaces, wherein a rigid body is attached to the portion that is in the fixed state. The Coriolis flowmeter having two V-shaped tube forming surfaces according to claim 4,
The Coriolis flowmeter having two V-shaped tube forming surfaces, wherein the rigid body is formed in a split type that allows the portion in the fixed state to be freely attached and detached.

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