KR102388598B1 - Coriolis mass flow meter, flow pipe included therein, and flow measurement method using the same - Google Patents

Abstract

A Coriolis mass flow meter of the present invention comprises: a pair of flow pipes having both ends open, wherein an inlet is respectively provided at one end and an outlet is respectively provided at the other end so that the respective parts are spaced apart from each other to face each other; and tuning masses respectively coupled to the pair of flow pipes. In addition, the present invention provides the Coriolis mass flow meter, which comprises: the flow pipe; a vibrator installed at a predetermined distance between the pair of flow pipes and configured to vibrate the pair of flow pipes; a vibration sensor configured to sense vibrations of the pair of flow pipes; a temperature sensor configured to sense the temperature of the pair of flow pipes; and a circuit unit for receiving data obtained by the measurement by the vibration sensor and the temperature sensor, and measuring a flow rate based on the received data. In addition, the present invention provides a flow rate measurement method of the Coriolis mass flow meter, which comprises the steps of: (a) forming torsion by vibrating the pair of flow pipes, to which the tuning masses are attached, at a vibration frequency in a bending mode; (b) measuring a torsion angle by the vibration frequency and a phase time corresponding thereto; and (c) calculating the mass flow rate of the pair of flow pipes. The step (a) includes a step in which the pair of flow pipes are formed to be symmetrical with respect to an imaginary plane of symmetry, and the tuning masses are coupled to symmetrical positions of the pair of flow pipes with respect to the symmetry plane to vibrate the pair of flow pipes. According to the present invention, the measurement of the mass flow rate can be made easier.

Description

Coriolis mass flow meter, flow pipe included therein, and flow measurement method using the same

The present invention relates to a Coriolis mass flow meter, a flow pipe included therein, and a flow rate measurement method using the same, and more particularly, a Coriolis mass flow meter capable of accurately measuring flow rate by combining a tuning mass coupled to a flow pipe pipe, and included therein It relates to a flow pipe and a flow rate measurement method using the same.

Coriolis force is the force that acts when an object of a certain mass enters and leaves the center of the rotating disk on a rotating disk. , A Coriolis mass flow meter is a flow meter that measures flow using the Coriolis force.

A Coriolis mass flow meter is usually composed of two flow pipes (tubes), and has a structure in which an exciter forcibly vibrates the U-shaped flow pipe up and down.

When a fluid flows into the U-shaped flow pipe of a Coriolis mass flow meter, Coriolis accelerations in opposite directions occur at the inlet and outlet of the flow pipe, and the force generated by the Coriolis acceleration twists the flow pipe.

At this time, since the amount of twist of the flow pipe changes according to the magnitude of the Coriolis acceleration applied to the flow pipe, an electronic pickup device is installed at the inlet and the outlet of the flow pipe, and the twist amount is measured using time difference detection. Since the measured time difference is precisely proportional to the mass flow rate of the fluid, the mass flow rate passing through the flow path is directly measured.

In other words, the Coriolis mass flow meter is not affected by the temperature, pressure, density, viscosity, etc. of the fluid to be measured, so it is theoretically possible to measure the mass flow of any fluid. However, it is sensitive to the vibration of the flow pipe and has a disadvantage in that it is difficult to accurately measure the mass flow rate at a low flow rate.

Korean Patent Registration No. 10-1231117 (Registered on February 1, 2013)

It is an object of the present invention to provide a Coriolis mass flow meter capable of measuring the mass flow rate of a low flow rate or low density fluid, a flow pipe included therein, and a flow rate measurement method using the same in order to solve the above problems.

The problems to be solved by the present invention are not limited to the mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The flow path pipe included in the Coriolis mass flow meter according to an embodiment of the present invention for solving the above-described problems has both ends open, an inlet port is provided on one side, and an outlet port is provided on the other side, so that each part A pair of flow pipes spaced apart to face each other; and a tuning mass respectively coupled to the pair of flow pipes.

In addition, the pair of flow pipes are formed to be symmetrical with respect to an imaginary symmetry plane, and the tuning mass may be coupled to at least one tuning mass at a symmetrical position of the pair of flow pipes with respect to the symmetry plane. can

In addition, the tuning mass may be formed in a ball shape.

In addition, the tuning mass is formed through the diameter of the ball, and may be provided separately as a first tuning member and a second tuning member based on a symmetrical plane including a through axis.

In addition, a plurality of the tuning masses may be formed and coupled to one side based on the symmetrical plane, and may be formed and coupled to the other side in the same manner.

In addition, the tuning mass may be formed in a cylindrical shape.

In addition, a plurality of the tuning masses may be formed and coupled to one side with respect to the symmetrical plane, and may be formed and coupled to the other side to be symmetrical with the one side.

In addition, the tuning mass is formed to penetrate in the height direction of the cylinder, and may be provided separately as a first tuning member and a second tuning member based on a symmetrical plane including a through axis in the height direction.

In addition, the pair of flow pipes, the inlet and one end connected to the inlet connection portion; and an outlet connector having one end connected to the outlet, wherein the tuning mass is formed in a bar shape, one end connected to the inlet connector, and the other end connected to the one end with respect to the symmetrical plane. It further includes a tuning mass bar connected to the discharge connector at a position symmetrical to the stage.

In addition, a plurality of the tuning masses may be formed to be spaced apart from each other at regular intervals.

In addition, the inlet strut bar attached to the pair of the inlet; and a discharge strut bar attached to a pair of the discharge ports.

In addition, a Coriolis mass flow meter according to another embodiment of the present invention includes the pair of flow pipes; a vibrator installed to be spaced apart from each other by a predetermined distance between the pair of flow pipes and configured to vibrate the pair of flow pipes; a vibration sensor configured to sense vibration of the pair of flow pipes; and a temperature sensor configured to sense the temperature of the pair of flow pipes. and a circuit unit for receiving data measured by the vibration sensor and the temperature sensor, and measuring a flow rate based on the received data.

In addition, the pair of flow pipes, the pair of inlet strut bars attached to the inlet; and a discharge strut bar attached to a pair of the discharge ports.

In addition, a flow rate measurement method using a Coriolis mass meter according to another embodiment of the present invention comprises the steps of: (a) vibrating a pair of flow pipes to which a tuning mass is attached at a vibration frequency in a bending mode to form a torsion; (b) measuring a twist angle and a phase time corresponding thereto by the vibration frequency; and (c) calculating the mass flow rate of the pair of flow pipes, wherein in step (a), the pair of flow pipes are formed to be symmetrical with respect to an imaginary symmetrical plane, and the tuning mass is and vibrating the pair of flow pipes by being coupled to symmetrical positions of the pair of flow pipes with respect to the symmetrical plane.

In addition, in the step (a), the tuning mass ball formed in the form of a ball included in the tuning mass is coupled to a symmetrical position of the pair of flow pipes with respect to the symmetrical plane to form a pair of flow paths. The method further comprises vibrating the tube.

In addition, the plurality of tuning masses are formed and coupled to one side based on the symmetrical plane, and the other side is formed to be symmetrical with the one side and coupled to vibrate a pair of flow pipes.

In addition, the step (a) further includes the step of vibrating the pair of flow pipes by forming the tuning mass in a cylindrical shape and coupled to the flow pipe.

In addition, in the step (a), a plurality of tuning masses are formed and coupled to one side with respect to the symmetrical plane, and are formed to be symmetrical with the one side on the other side, and are coupled to the flow path pipe to combine with a pair of flow pipe tubes It further comprises the step of vibrating.

In addition, the step (a), the pair of flow pipes, the inlet and one end is connected to the inlet connection portion; And it further comprises a discharge connection part connected to the outlet and one end, the tuning mass, including a tuning mass bar formed in the form of a bar,

One end of the tuning mass bar is connected to the inlet connector, and the other end is connected to the outlet connector at a position symmetrical to the one end with respect to the symmetrical plane to vibrate the pair of flow passage tubes.

In addition, the step (a) further includes the step of forming a plurality of the tuning masses spaced apart from each other by a predetermined interval, coupled to the flow pipe, and vibrating the pair of flow pipes.

In addition, the step (c) may include: acquiring an inflow displacement signal and an outflow displacement signal of the mass flow meter using a signal measurement module; generating trigger waveforms by triggering the inflow displacement signal and the outflow displacement signal acquired using a trigger waveform generating module to different threshold levels according to preset conditions; normalizing an inflow trigger waveform and an outflow trigger waveform using a waveform shaping module; measuring output pulse widths Δt1 and Δt2 by counting clocks using an output pulse width processing module; obtaining a measured phase shift time difference ΔTm and an initial zero offset time difference ΔT0 using the output pulse width using the output pulse width processing module; and calculating a flow rate value using the flow calibration factor (FCF) and the time differences obtained using the flow rate calculation module.

In addition, the generating of each of the trigger waveforms includes generating the inflow trigger waveform by triggering the inflow displacement signal to a threshold level +, and setting the outflow displacement signal to a threshold level − trigger to generate the outflow trigger waveform.

According to the present invention, it may be easier to measure the mass flow rate of the low flow rate or low density fluid by coupling the tuning mass to the flow pipe.

For this reason, precise measurement is possible even in the structure of a flow pipe having a high natural frequency, and the accuracy is more excellent in mass measurement.

1 is a perspective view showing flow pipes of a conventional Coriolis mass flow meter.
2A is a perspective view showing a flow path of a Coriolis mass flow meter according to the present invention.
FIG. 2B is a perspective view illustrating another embodiment of FIG. 2A .
3A is a perspective view illustrating another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention.
3B is a perspective view illustrating another embodiment of FIG. 3A .
4A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention.
4B is a perspective view illustrating another embodiment of FIG. 4A .
5A is a perspective view illustrating another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention.
5B is a perspective view illustrating another embodiment of FIG. 5A .
6A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention.
6B is a perspective view illustrating another embodiment of FIG. 6A .
7 is a block diagram showing the configuration of a Coriolis mass flow meter according to the present invention.
8 is a flowchart illustrating a flow rate measurement method using a Coriolis mass flow meter according to an embodiment of the present invention.
9 is a flowchart illustrating a specific process of step S100 in the flow rate measurement method of FIG. 8 .

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention may be embodied in various different forms that are limited to the embodiments disclosed below, and only these embodiments allow the disclosure of the present invention to be complete, and to those skilled in the art to which the present invention pertains It is provided to fully understand the scope of the present invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein will have the meaning commonly understood by those of ordinary skill in the art to which this invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing flow pipes of a conventional Coriolis mass flow meter.

In a conventional Coriolis mass flow meter, a fluid flows in from one side of a flow pipe, measures the flow rate of the introduced fluid, and then circulates the fluid to the other side . Referring to FIG. 1 , It can be seen that the shape of the conventional flow pipe is variously provided in a symmetrical form as shown.

FIG. 2A is a perspective view illustrating a flow path pipe 100 of a Coriolis mass flow meter 10 according to the present invention, and FIG. 2B is a perspective view illustrating another embodiment of FIG. 2A .

Referring to Figures 2a and 2b, The flow pipe 100 of the Coriolis mass flow meter 10 according to the illustrated embodiment is formed symmetrically with respect to the symmetry plane A of FIG. 2A , and includes an inlet connector 110 , an inlet 111 , and an outlet connector 120 . ), including an outlet 121 and a tuning mass 200 .

The flow pipe 100 is formed through open both ends so that the fluid can flow. Referring to Figure 2a, the flow pipe 100 is formed in a pair to be symmetrical with respect to the symmetry plane (A). Each flow pipe 100 is spaced apart so that each part faces each other.

An inlet connection part 110 is formed on one side of the flow pipe 100 , and an exhaust connection part 120 is formed on the other side.

An inlet 111 is formed at one end of the flow pipe 100 , and an outlet 121 is formed at the other end. At this time, one end of the inlet connector 110 and the inlet 111 are connected, and one end of the outlet connector 120 and the outlet 121 are connected.

In order to achieve the stability of the flow pipe 100 and separate the vibration mode of the flow pipe 100, the inlet strut bar 112 is attached to the inlet 111 of the pair of flow pipe 100 close to, A discharge strut bar 122 is attached adjacent to the discharge port 121 of the pair of flow paths 100 .

The tuning mass 200 is formed at a symmetrical position of each flow pipe 100 with respect to the symmetrical plane A of FIG. 2A and is coupled to each flow pipe 100, and in the pair of flow pipes 100, each The position of the tuning mass 200 coupled to the flow pipe 100 corresponds to the facing position.

The tuning mass 200 may be formed in a ball shape. The tuning mass 200 in the form of a ball is formed through the diameter of the sphere, and can be coupled to the flow path tube 100 by the through-formed portion. At this time, the tuning mass 200 in the form of a ball is detachable.

The tuning mass 200 is formed through the diameter of the ball, and may be provided separately as a first tuning member 201 and a second tuning member 202 based on a symmetrical plane including a through-axis.

When the first tuning member 201 and the second tuning member 202 are coupled to the flow pipe 100 , a ball-shaped tuning mass 200 can be formed.

Specifically, the tuning mass 200 formed in the form of a ball is coupled to one side of the flow pipe 100 with respect to a symmetrical plane including the through shaft, and the other side is formed at a position symmetrical with the one side. become and combine In this case, the one side means the left side of the symmetry plane (A), and the other side means the right side of the symmetry plane (A).

On the other hand, referring to FIG. 2A , in a pair of flow pipes 100 , one tuning mass 200 is coupled to the one side and the other side of each flow pipe, so that a total of four tuning masses 200 are formed. It may be coupled to the flow pipe 100 , but the number of the coupled tuning masses 200 is not limited to a total of four.

In this regard, referring to FIG. 2b , it is possible to couple two tuning masses 200 in the form of balls to one side of each of the flow pipes 100 in a pair of flow pipes 100 , It is also possible that two tuning masses 200 in the form of eight balls are coupled to the other side at positions symmetrical to the one side to be coupled to the flow pipe 100 . Although not shown, the number of tuning masses 200 coupled to the one side and the other side, respectively, may be three or more.

3A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention, and FIG. 3B is a perspective view showing another embodiment of FIG. 3A .

3A and 3B , the tuning mass 200 may be formed in a cylindrical shape. The cylindrical tuning mass 200 is formed to pass through along the height direction, and the tuning mass 200 and the flow channel 100 may be coupled to each other by the through-formed portion. At this time, the cylindrical tuning mass 200 is detachable.

The tuning mass 200 is penetrating along the height of the cylinder, and based on the symmetrical plane of the cylindrical tuning mass 200 including the height direction through axis, the first tuning member 201 and the second tuning member 202. It may be provided separately.

When the first tuning member 201 and the second tuning member 202 are coupled to the flow pipe 100 , a ball-shaped tuning mass 200 can be formed.

It is preferable that the central axis of the flow pipe 100 and the through axis of the cylindrical tuning mass 200 coincide.

Specifically, the tuning mass 200 formed in a cylindrical shape is coupled to one side of the flow pipe 100 with respect to the symmetrical plane, and the other side is formed and coupled to the other side at a position symmetrical with the one side. In this case, the meanings of the one side and the other side are the same as described above.

On the other hand, referring to FIG. 3A , in the pair of flow pipes 100 , a cylindrical tuning mass 200 is combined, one on the one side and the other side of each flow pipe, to form a total of four cylinders. The tuning mass 200 may be coupled to the flow pipe 100 , but the number of the coupled tuning masses 200 is not limited to one.

Specifically, referring to FIG. 3B , two cylindrical tuning masses 200 may be coupled to one side of each of the flow passage tubes 100 in a pair of flow passage tubes 100 , and the other side may have the one It is also possible that two of the tuning masses 200 in the form of a cylinder are coupled at positions symmetrical to the side to be coupled to the flow pipe 100 . Although not shown, the number of the cylindrical tuning masses 200 coupled to the one side and the other side, respectively, may be three or more.

4A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention, and FIG. 4B is a perspective view showing another embodiment of FIG. 4A .

4A and 4B , the tuning mass 200 includes a tuning mass bar 210 formed in a bar shape.

The tuning mass bar 210 has one end connected to the inlet connector 110 of each flow pipe 100, and the other end is the outlet connector 120 at a position symmetrical with the inlet connector 110 connected with respect to the symmetrical plane. is connected to In this case, the positions of the inlet connection part 110 and the exhaust connection part 120 refer to FIG. 2A . The number of the coupled tuning mass bars 210 is not limited to one.

Specifically, referring to FIG. 4B , two or more tuning mass bars 210 are formed to be spaced apart from each other at regular intervals, and may be coupled to opposing positions of each flow pipe 100 .

5A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention, and FIG. 5B is a perspective view showing another embodiment of FIG. 5A .

Referring to FIG. 5A , the above-described ball-shaped tuning mass 200 is coupled to the same position for each flow pipe 100 so as to be symmetric with respect to the aforementioned symmetry plane, and the ball ( The tuning mass bar 210 is coupled and connected to the tuning mass 200 in the form of a ball).

In addition, referring to Figure 5b, After coupling a plurality of the above-described ball-shaped tuning mass 200 to one side of the flow pipe 100 and the same number of tuning masses 200 to a symmetrical position on the other side with respect to the symmetrical plane, It is also possible to couple and connect the tuning mass bar 210 for each tuning mass 200 of the same height based on the inlet 111 and the outlet 121 .

6A is a perspective view showing another embodiment of a flow pipe of a Coriolis mass flow meter according to the present invention, and FIG. 6B is a perspective view showing another embodiment of FIG. 6A .

Referring to FIG. 6A , the above-described cylindrical tuning mass 200 is coupled to the same position for each flow pipe 100 so as to be symmetric with respect to the above-described symmetry plane, and the cylindrical tuning mass 200 is formed in each flow pipe 100 . (200) is connected to the tuning mass bar 210 is coupled.

In addition, referring to Figure 6b, A plurality of the above-described cylindrical tuning masses 200 are coupled to one side of the flow pipe 100, and the same number of cylindrical tuning masses 200 are coupled at symmetrical positions on the other side based on the symmetry plane, It is also possible to couple and connect the tuning mass bars 210 for each of the cylindrical tuning masses 200 of the same height with respect to the inlet 111 and the outlet 121 .

2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a and 6b as described above in the pair of flow pipe 100 in each flow pipe 100 When the tuning mass 200 or the tuning mass bar 210 is coupled to the same position to be opposed to the , measurement of the mass flow rate of a low flow rate or low density fluid is possible more accurately than a conventional Coriolis mass flow meter.

7 is a block diagram showing the configuration of a Coriolis mass flow meter 10 according to the present invention.

Referring to FIG. 7 , the Coriolis mass flow meter 10 includes a pair of flow pipes 100 , a tuning mass 200 , a vibrator 300 , a vibration sensor 400 , a temperature sensor 500 and a circuit unit 600 . includes

At this time, the pair of flow pipe 100 is the flow pipe 100 described above with reference to FIGS. 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B, 6A and 6B. ) means

The vibrator 300 is installed to be spaced apart from each other by a predetermined distance between the pair of flow pipe 100 , and is provided to vibrate the flow pipe 100 .

When the vibrator 300 vibrates, the flow tube 100 reciprocates up and down by the vibration generated by the vibrator 300 . At this time, the vibrator 300 vibrates each flow pipe 100 in opposite directions.

The vibrator 300 is attached to a central position between the inlet 111 and the outlet 121 of the flow pipe 100 . This position causes the vibrator 300 to apply the maximum force to the flow passage tube 100 using the minimum force.

The vibrator 300 receives a signal from a measurement electronic module (not shown) and causes the vibrator 300 to vibrate at a desired amplitude and frequency.

On the other hand, the vibration sensor 400 is configured to sense the vibration of the flow pipe 100 , and specifically senses a Coriolis force caused by a material flowing through the flow pipe 100 .

At this time, the torsion angle of the flow pipe 100 appears in proportion to the Coriolis force acting on the flow pipe 100 , and as described above, the pair of flow pipe 100 is the same as the symmetrical plane to measure the twist angle. They are installed opposite each other.

The vibration sensor 400 includes a signal measurement module 410 .

The signal measuring module 410 is configured with a precise sensor to obtain an inflow displacement signal and an exhaust displacement signal of the fluid flowing through the flow path 100 .

At this time, the signal measuring module 410 is installed at the inlet 111 and the outlet 121 of the flow pipe 100 . Specifically, by installing displacement detectors on the inlet 111 side and the outlet 121 side, the inflow displacement signal and the exhaust displacement signal may be acquired.

Signals measured by the signal measuring module 410 are transmitted to a circuit unit 600 to be described later.

The temperature sensor 500 is installed in the flow pipe 100 , and measures the temperature of the fluid flowing in from the inlet 111 .

The temperature sensor 500 changes the elastic modulus of the flow pipe 100 according to the temperature of the fluid flowing inside the flow pipe 100, so that the natural frequency and torsion angle of the flow pipe 100 are subtly changed to measure the flow rate. This is to prevent errors from occurring.

The circuit unit 600 receives the signal (data) measured by the vibration sensor 400 and the temperature sensor 500 and converts it into a value of mass flow based on the detected angle data and temperature data, and a trigger waveform generation module 610 ), a waveform shaping module 620 , an output pulse width processing module 630 and a flow rate calculation module 640 .

The trigger waveform generation module 610 is configured to generate trigger waveforms with different threshold levels by triggering the inflow displacement signal and the exhaust displacement signal acquired by the signal measurement module 410 according to a preset condition.

The waveform shaping module 620 is configured to shape the inflow trigger waveform and the exhaust trigger waveform.

The output pulse width processing module 630 counts the clock to measure the output pulse widths Δt1 and Δt2, and uses the output pulse width to obtain the measured phase shift time difference ΔTm and the initial zero offset time difference ΔT0 do. In this case, ΔTm means a half value of the difference between Δt1 and Δt2.

According to the embodiment of the present invention, it is possible to secure ΔTm of a certain size even at a low flow rate of the flow path pipe 100, so that the flow rate can be measured more accurately.

The flow rate calculation module 640 is configured to calculate a mass flow rate value using the obtained time differences and a flow calibration factor (FCF).

At this time, the value of the measured mass flow is provided to an electrically connected display (not shown) so that the user can check the value of the mass flow in real time.

8 is a flowchart illustrating a flow rate measurement method using the Coriolis mass flow meter 10 according to an embodiment of the present invention, and FIG. 9 is a flowchart illustrating a detailed process of step S100 in the flow rate measurement method of FIG. 8 .

8 and 9 , the flow rate measurement method using the Coriolis mass flow meter 100 includes the steps of (a) vibrating a pair of flow pipes to which a tuning mass is attached at a vibration frequency in a bending mode to form a torsion (S100), (b) measuring the torsion angle and the phase time corresponding thereto by the vibration frequency (S200), and (c) calculating the mass flow rate of the pair of flow pipes (S300).

(a) step (S100), the pair of flow pipe 100 is formed to be symmetrical with respect to an imaginary symmetrical plane, and the tuning mass 200 is coupled to the flow path pipe 100 so as to be opposed to the symmetrical plane. It further includes the step of vibrating the pair of flow pipe 100 (S101).

As described above, in the Coriolis mass flow meter 10 according to an embodiment of the present invention, three types of tuning masses 200 are coupled to the flow pipe 100 to vibrate the flow pipe 100 .

Referring to FIG. 9 , as an example, the tuning mass ball formed in the form of a ball among the tuning masses 200 coupled to the flow pipe 100 is a pair of flow path pipes 100 based on the symmetrical plane. It is coupled to a symmetrical position to vibrate a pair of flow pipes (S110).

At this time, a plurality of tuning masses 200 are formed on one side of the flow pipe 100 based on the symmetrical plane and are coupled to the flow pipe 100 , and the other side of the flow pipe 100 is symmetrical with the one side. It is formed and coupled to the flow pipe 100 to vibrate the pair of flow pipe 100 (S111).

As another example, the tuning mass 200 coupled to the flow pipe 100 is formed in a cylindrical shape, and the tuning mass 200 is coupled to the flow pipe 100 to vibrate the pair of flow pipe 100 ( S120 ). ).

At this time, a plurality of cylindrical tuning masses 200 are formed on one side of the flow pipe 100 based on the symmetrical plane and coupled to the flow pipe 100 , and the one on the other side of the flow pipe 100 . It is formed to be symmetrical to the side and is coupled to the flow pipe 100 to vibrate a pair of flow pipe tubes (S121).

As another example, one end of the tuning mass bar 210 formed in a bar shape among the tuning masses 200 coupled to the flow pipe 100 is connected to the inlet connector 110 of the flow pipe 100 . and the other end is connected to the discharge connection part at a position symmetrical to the one end with respect to the symmetrical plane of the flow pipe 100 to vibrate a pair of flow pipes (S130).

At this time, a plurality of tuning mass bars 210 are spaced apart from each other at regular intervals and are coupled to positions opposite to each of the flow pipes 100 to vibrate the pair of flow pipes 100 ( S131 ).

In step (b), the twist angle by the vibration frequency and the phase time for it are measured (S200).

Although not shown in the illustrated embodiment, specifically, an inlet displacement signal and an outlet displacement signal of the mass flow meter may be obtained by using the signal measurement module 410 . At this time, trigger waveforms are respectively generated by triggering the inflow displacement signal and the exhaust displacement signal acquired using the trigger waveform generating module 610 to different threshold levels according to preset conditions.

In this case, the generating of each of the trigger waveforms includes generating the inflow trigger waveform by triggering the inflow displacement signal to a threshold level +, and setting the exhaust displacement signal to a threshold level − trigger to generate the emission trigger waveform.

Then, the input trigger waveform and the discharge trigger waveform are standardized using the waveform shaping module 620 , and clocks are counted using the output pulse width processing module 630 to measure the output pulse widths Δt1 and Δt2.

In step (c), the mass flow rate of the pair of flow pipes is calculated (S300).

Specifically, the mass flow rate is proportional to the phase time. In general, the mass flow measurement formula using the phase time is as follows.

q _m means the flow rate of the fluid passing through the flow pipe 100,

τ means the phase time,

k _s means torsional stiffness,

L means the height distance of the vibrator 300 with respect to the inlet and outlet of the flow pipe 100,

d means the distance between the inlet connector 110 and the outlet connector 120 of the flow pipe 100,

Ω _f means the bending frequency,

Ω _s means torsional frequency.

However, in the present invention, instead of the general torsional stiffness (k _s ), the torsional stiffness coefficient GI _s and the phase time measurement formula using d _m modified according to the shape of the flow path 100 are used. The phase time measurement formula is as follows.

In this case, d _m is, in the case of the flow path pipe 100 having an inverted triangular shape according to an embodiment of the present invention, a flow pipe 100 satisfying the area at the same height by assuming a simple rectangle after calculating the total area of the flow pipe pipe Means the width between the inlet connection 110 and the outlet connection 120 of

The torsional stiffness coefficient GI _s can be obtained using the following equation.

In this case, T stands for torque,

는 비틀림 변형을 의미한다.

means torsional deformation.

On the other hand, according to an embodiment of the present invention, when a process in which the bending frequency (Ω _f ) and the torsion frequency (Ω _s ) become similar while changing the mass of the tuning mass 200 is found through analysis, the target phase time difference τ is It will be possible to derive the shape of the flow pipe 100 to be optimized.

And, although there is no illustrated embodiment, the measured phase shift time difference ΔTm and the initial zero offset time difference ΔT0 are calculated using the output pulse width using the output pulse width processing module 630, and the flow rate calculation module 640 The flow rate value is calculated using the time differences and the flow calibration factor (FCF) obtained using .

In the above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains within the scope not departing from the technical spirit and scope of the present invention described in the claims to be described later. It will be understood that various modifications and variations of the present invention are possible. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: Coriolis mass flow meter
100: Euro tube
110: inlet connection
111: inlet
112: inlet strut bar
120: exhaust connection
121: outlet
122: exhaust strut bar
200: tuning mass
201: first tuning member
202: second tuning member
210: tuning mass bar
300: vibrator
400: vibration sensor
410: signal measurement module
500: temperature sensor
600: circuit part
610: trigger waveform generation module
620: waveform shaping module
630: output pulse width processing module
640: flow calculation module

Claims (20)

a pair of flow passage tubes having both ends open, each having an inlet at one end, and an outlet at the other end so that each part faces each other and spaced apart from each other; and
It includes a tuning mass coupled to the pair of flow pipes, respectively,
The pair of flow pipes are formed to be symmetrical with respect to a virtual symmetrical plane,
The tuning mass is
It characterized in that at least one tuning mass is coupled to a symmetrical position of the pair of flow pipes with respect to the symmetrical plane,
When the tuning mass is formed in a ball shape or a cylindrical shape,
It is characterized in that a plurality is formed and coupled to one side based on the symmetry plane, and the same is formed and coupled to the other side,
The pair of flow pipes,
an inlet connector having one end connected to the inlet; and
It further comprises a discharge connection part to which one end is connected to the outlet,
an inlet strut bar attached to a pair of the inlet ports; and
Comprising a discharge strut bar attached to the pair of outlets,
The flow tube of a Coriolis mass flow meter.
a vibrator installed to be spaced apart from each other by a predetermined distance between the pair of flow pipes and configured to vibrate the pair of flow pipes;
a vibration sensor configured to sense vibration of the pair of flow pipes; and
a temperature sensor configured to sense the temperature of the pair of flow pipes;
and a circuit unit for receiving data measured by the vibration sensor and the temperature sensor, and measuring a flow rate based on the received data,
The vibration sensor is
and a signal measuring module configured to obtain an inlet displacement signal and an outlet displacement signal of the flow pipe;
The circuit unit,
a trigger waveform generating module configured to generate trigger waveforms with different threshold levels by triggering the inflow displacement signal and the exhaust displacement signal acquired by the signal measurement module according to a preset condition;
a waveform shaping module configured to shape an inlet trigger waveform and an exhaust trigger waveform;
An output pulse width processing module configured to count the clock to measure output pulse widths Δt1 and Δt2, and to obtain a measured phase shift time difference ΔTm and an initial zero offset time difference ΔT0 using the output pulse width; and
Further comprising a flow rate calculation module configured to calculate a flow rate value using the obtained time differences and a flow calibration factor (FCF),
The signal measurement module,
is formed to obtain an inlet displacement signal and an outlet displacement signal from displacement detectors installed on the inlet side and the outlet side of the flow path, respectively;
The trigger waveform generation module,
triggering the inflow displacement signal to a threshold level + that is the preset condition,
triggering the discharge displacement signal to a threshold level - which is the preset condition,
Each of the trigger waveforms is generated using the different threshold levels,
The tuning mass is provided for vibrating the pair of flow pipes,
Coriolis mass flow meter. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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