High precision coriolis mass flowmeter

Abstract

The application relates to a high-precision Coriolis mass flowmeter, which comprises a measuring pipe pair, a zero measuring pipe pair, an exciter and a control module, the control module acquires the phase difference of the inlet and outlet ends of the measuring pipe pair and the zero point of the zero measuring pipe pair, and compensates the phase difference according to the zero point. The compensated phase difference is only related to the flow, the influence of the external environment on the mass flowmeter is avoided, and the measurement precision of the mass flowmeter is improved.

Description

Technical Field

[0001] This invention relates to the field of mass flow detection technology, and in particular to a high-precision Coriolis mass flow meter. Background Technology

[0002] The working principle of a Coriolis mass flow meter is as follows: Under the influence of the Coriolis effect, the measuring tube vibrates asynchronously, with the fluid directions at the inflow and outflow ends being opposite, resulting in a phase difference in vibration. This phase difference can be detected to calculate the mass flow rate. The zero point of the mass flow meter refers to the average value of the phase difference when the measuring tube is filled with fluid and the flow rate is zero. Theoretically, the zero point of a mass flow meter should be zero. However, in practice, due to factors such as manufacturing processes and external interference, the zero point of a mass flow meter is usually not equal to zero. Therefore, it is necessary to correct the zero point of the Coriolis mass flow meter through zeroing to ensure its measurement accuracy.

[0003] However, during use, environmental factors such as temperature changes and external vibrations can cause the zero-point value of the mass flow meter to change, resulting in zero-point drift and affecting the metering accuracy. Currently, the impact of zero-point drift is often reduced through periodic calibration. However, periodic calibration needs to be performed while the production line is stopped, which significantly impacts production efficiency.

[0004] Based on the above-mentioned technical problems, this application proposes a high-precision Coriolis mass flow meter. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision Coriolis mass flow meter to solve the technical problems mentioned in the background art. This purpose is achieved through the following technical solution:

[0006] A high-precision Coriolis mass flow meter includes a measuring tube pair, a zero-measurement tube pair, a vibrator, and a control module. The measuring tube pair includes a first measuring tube and a second measuring tube, arranged side-by-side. A first vibration pickup is positioned between the inlet end of the first measuring tube and the inlet end of the second measuring tube, and a second vibration pickup is positioned between the outlet end of the first measuring tube and the outlet end of the second measuring tube. The zero-measurement tube pair is arranged side-by-side with the measuring tube pair, including a first zero-measurement tube and a second zero-measurement tube, arranged side-by-side. A third vibration pickup is positioned between the inlet end of the first zero-measurement tube and the inlet end of the second zero-measurement tube. A fourth vibration pickup is installed between the port end and the outlet end of the second zero-measuring tube; a first solenoid valve is installed at the outlet end of both the first and second zero-measuring tubes. When the first solenoid valve is closed, the fluid medium inside the zero-measuring tube pair is in a static state; the vibrator is connected to the measuring tube pair and the zero-measuring tube pair to drive the measuring tube pair and the zero-measuring tube pair to vibrate synchronously; the control module drives the vibrator to work, realizing the synchronous vibration of the measuring tube relative to the zero-measuring tube pair; the control module receives the signals from the first and second vibration pickups and calculates the phase difference; the control module receives the signals from the third and fourth vibration pickups and calculates the zero point, and the control module compensates for the phase difference based on the zero point.

[0007] Furthermore, a first manifold is installed at the inlet end of the measuring tube pair and the inlet end of the zero-measurement tube pair, and the inlet ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the first manifold; a second manifold is installed at the outlet end of the measuring tube pair and the outlet end of the zero-measurement tube pair, and the outlet ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the second manifold.

[0008] Furthermore, a first flange is installed on the first manifold, a second flange is installed on the second manifold, and a support pipe is installed between the first flange and the second flange.

[0009] Furthermore, a second solenoid valve is provided at the outlet end of both the first measuring tube and the outlet end of the second measuring tube.

[0010] Furthermore, the first solenoid valve is a normally closed solenoid valve, and the second solenoid valve is a normally open solenoid valve.

[0011] Furthermore, node plates are respectively provided at both ends of the measuring tube pair and at both ends of the zero-measurement tube pair, and the ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the node plates.

[0012] Furthermore, the outer sides of the measuring tube pair and the zero measuring tube pair are covered with a protective shell, and an insulation layer is applied to the protective shell.

[0013] Furthermore, the control module includes a control unit, a drive unit, a detection unit, and a display unit. The drive unit, the detection unit, and the display unit are all electrically connected to the control unit. The drive unit is electrically connected to the exciter, and the detection unit is electrically connected to the first vibration pickup, the second vibration pickup, the third vibration pickup, and the fourth vibration pickup.

[0014] The technical solutions provided in this application have at least the following technical effects or advantages:

[0015] 1. By installing a closed-end zero-measuring tube pair at the measuring tube pair, and synchronously exciting the measuring tube pair and the zero-measuring tube pair with an exciter, the zero point of the mass flow meter is obtained in real time. The phase difference between the inlet and outlet ends of the measuring tube pair is compensated by the real-time zero point, so that the compensated phase difference is only related to the flow rate, avoiding the influence of the external environment on the mass flow meter and improving the measurement accuracy of the mass flow meter.

[0016] 2. By installing a solenoid valve at the outlet end of the zero-measurement tube pair, the fluid medium can be automatically filled into the zero-measurement tube pair when the solenoid valve is opened, and the fluid medium inside the zero-measurement tube pair can be prevented from flowing when the solenoid valve is closed, thus realizing zero-point measurement of the zero-measurement tube pair; 3. By installing a solenoid valve on the measuring tube pair, on the one hand, it can ensure that the measuring tube pair and the zero-measurement tube pair have the same structure, reducing measurement error; on the other hand, the measuring tube pair and the zero-measurement tube pair can be interchanged, avoiding the impact of fluid medium deposition inside the zero-measurement tube pair on the accuracy of measurement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0019] Figure 2 This is a partial cross-sectional view of an embodiment of this application;

[0020] Figure 3This is a schematic diagram of the control module structure according to an embodiment of this application. Reference numerals: 1. Measuring tube pair; 11. First measuring tube; 12. Second measuring tube; 2. Zero-testing tube pair; 21. First zero-testing tube; 22. Second zero-testing tube; 3. Vibrator; 3a. Connecting plate; 4. Control module; 41. Control unit; 42. Drive unit; 43. Detection unit; 44. Display unit; 5a. First manifold; 5b. Second manifold; 6a. First flange; 6b. Second flange; 6c. Support tube; 7a. First solenoid valve; 7b. Second solenoid valve; 8. Node plate; 9a. First vibration pickup; 9b. Second vibration pickup; 9c. Third vibration pickup; 9d. Fourth vibration pickup. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0022] like Figure 1-3 The high-precision Coriolis mass flow meter shown includes a measuring tube pair 1, a zero-measurement tube pair 2, an exciter 3, and a control module 4. The measuring tube pair 1 includes a first measuring tube 11 and a second measuring tube 12, and the zero-measurement tube pair 2 includes a first zero-measurement tube 21 and a second zero-measurement tube 22. The first measuring tube 11, the second measuring tube 12, the first zero-measurement tube 21, and the second zero-measurement tube 22 are all identical in shape, size, and material. The first measuring tube 11, the second measuring tube 12, the first zero-measurement tube 21, and the second zero-measurement tube 22 are all U-shaped tubes, and the first measuring tube 11, the second measuring tube 12, the first zero-measurement tube 21, and the second zero-measurement tube 22 are arranged side by side.

[0023] like Figure 1 , Figure 2 As shown, a first manifold 5a is installed at the inlet end of measuring tube pair 1 and the inlet end of zero measuring tube pair 2. The inlet ends of the first measuring tube 11, the second measuring tube 12, the first zero measuring tube 21, and the second zero measuring tube 22 are all connected to the first manifold 5a. The first manifold 5a is equipped with a first flange 6a through a bend.

[0024] like Figure 1 , Figure 2As shown, a second manifold 5b is installed at the outlet end of measuring tube pair 1 and the outlet end of zero-measuring tube pair 2. The outlet ends of the first measuring tube 11 and the second measuring tube 12 are connected to the second manifold 5b via second solenoid valves 7b, respectively. The outlet ends of the first zero-measuring tube 21 and the second zero-measuring tube 22 are connected to the second manifold 5b via first solenoid valves 7a, respectively. The first solenoid valve 7a is a normally closed solenoid valve, and the second solenoid valve 7b is a normally open solenoid valve. Before operation, the first solenoid valve 7a is opened first, allowing fluid medium to enter the zero-measuring tube pair 1. Then, the first solenoid valve 7b is closed, at which point the zero-measuring tube pair 1 is filled with fluid medium, and the fluid medium within the zero-measuring tube pair 1 remains stationary.

[0025] Installing a second solenoid valve 7b on the measuring tube pair 1 can, on the one hand, ensure that the measuring tube pair 1 and the zero measuring tube pair 2 have the same structure, reducing measurement errors; on the other hand, it can allow the measuring tube pair 1 and the zero measuring tube pair 2 to be used interchangeably, avoiding the impact of fluid medium deposition inside the zero measuring tube pair on the accuracy of measurement.

[0026] The second manifold 5b is fitted with a second flange 6b via a bend. A support pipe 6c is installed between the first flange 6a and the second flange 6b. The mass flow meter is connected to the equipment pipeline through the first flange 6a and the second flange 6b. The support pipe 6c reinforces the measuring tube pair 1 and the zero measuring tube pair 2, preventing external vibrations from affecting the measuring tube pair 1 and the zero measuring tube pair 2.

[0027] The first measuring tube 11, the second measuring tube 12, the first zero measuring tube 21, and the second zero measuring tube 22 can also be straight tubes, S-shaped tubes, Ω-shaped tubes, or other special shapes, which are not limited here.

[0028] like Figure 1 , Figure 2 As shown, two node plates 8 are respectively installed at both ends of the measuring tube pair 1 and the zero-measurement tube pair 2. The ends of the first measuring tube 11, the second measuring tube 12, the first zero-measurement tube 21, and the second zero-measurement tube 22 are all connected to the node plates 8, and the first solenoid valve 7a and the second solenoid valve 7b are both located on the upper side of the two node plates 8. The lower ends of the two node plates 8 located on the lower side form the free vibration zone of the measuring tube pair 1 and the zero-measurement tube pair 2, while the two node plates 8 located on the upper side are used to reduce the impact of the vibration of the measuring tube pair 1 and the zero-measurement tube pair 2 on the equipment pipeline.

[0029] The outer sides of measuring tube pair 1 and zero-sensing tube pair 2 are covered with a protective shell (not shown), and an insulation layer is applied to the protective shell to reduce the influence of external temperature on measuring tube pair 1 and zero-sensing tube pair 2. Figure 1 , Figure 2As shown, a connecting piece 3a is installed in the middle of the bottom of the measuring tube pair 1 and the zero-measuring tube pair 2. The first measuring tube 11, the second measuring tube 12, the first zero-measuring tube 21, and the second zero-measuring tube 22 are all connected to the connecting piece 3a. The vibrator 3 is installed at one end of the connecting piece 3a, and the vibrator 3 realizes the synchronous vibration of the first measuring tube 11, the second measuring tube 12, the first zero-measuring tube 21, and the second zero-measuring tube 22 through the connecting piece 3a.

[0030] like Figure 1 As shown, a first vibration pickup 9a is installed between the inlet end of the first measuring tube 11 and the inlet end of the second measuring tube 12, and a second vibration pickup 9b is installed between the outlet end of the first measuring tube 11 and the outlet end of the second measuring tube 12. A third vibration pickup 9c is installed between the inlet end of the first zero-measuring tube 21 and the inlet end of the second zero-measuring tube 22, and a fourth vibration pickup 9d is installed between the outlet end of the first zero-measuring tube 21 and the outlet end of the second zero-measuring tube 22.

[0031] like Figure 3 As shown, the control module 4 includes a control unit 41, a drive unit 42, a detection unit 43, and a display unit 44. The drive unit 42, the detection unit 43, and the display unit 44 are all electrically connected to the control unit 41. The vibrator 3 is electrically connected to the drive unit 42 via a wire. The drive unit 42 drives the vibrator 3 to work, realizing the synchronous vibration of the measuring tube pair 1 and the zero measuring tube pair 2.

[0032] The first vibration pickup 9a, the second vibration pickup 9b, the third vibration pickup 9c, and the fourth vibration pickup 9d are all electrically connected to the detection unit 43. The detection unit 43 receives the signals from the first vibration pickup 9a and the second vibration pickup 9b and calculates the phase difference. The detection unit 43 receives the signals from the third vibration pickup 9c and the fourth vibration pickup 9d and calculates the zero point. The control unit 41 compensates for the phase difference based on the zero point detected by the detection unit and displays the compensated measurement data through the display unit 44.

[0033] Zero-point compensation for mass flow meters is existing technology and will not be discussed further here.

[0034] The working principle of this application embodiment is as follows:

[0035] Before measurement, first keep the first solenoid valve 7a open to allow the fluid medium to enter the zero measuring tube pair 2, and then close the first solenoid valve 7b to fill the zero measuring tube pair 2 with the fluid medium and keep the fluid medium in a static state.

[0036] During operation, the vibrator 3 synchronously drives the vibration of measuring tube pair 1 and zero-point tube pair 2. The control module 4 measures the phase difference between the inlet and outlet ends of measuring tube pair 1 through the first vibration pickup 9a and the second vibration pickup 9b, and simultaneously measures the phase difference (i.e., zero point) between the inlet and outlet ends of zero-point tube pair 2 through the third vibration pickup 9c and the fourth vibration pickup 9d. The control module 4 then compensates for the phase difference between the zero point and the measuring tube pair 1. Since the working environment of zero-point tube pair 2 and measuring tube pair 1 is the same, such as temperature, vibration, and installation stress, the compensated phase difference is only related to the flow rate, thereby improving the measurement accuracy of the Coriolis mass flow meter. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-precision Coriolis mass flow meter, characterized in that, include: The measuring tube pair includes a first measuring tube and a second measuring tube, which are arranged side by side. A first vibration pickup is provided between the inlet end of the first measuring tube and the inlet end of the second measuring tube, and a second vibration pickup is provided between the outlet end of the first measuring tube and the outlet end of the second measuring tube. A second solenoid valve is provided at the outlet end of both the first measuring tube and the outlet end of the second measuring tube. A zero-sensing tube pair is arranged side-by-side with a measuring tube pair. The zero-sensing tube pair includes a first zero-sensing tube and a second zero-sensing tube. The first measuring tube, the second measuring tube, the first zero-sensing tube, and the second zero-sensing tube are identical in shape, size, and material. The first zero-sensing tube and the second zero-sensing tube are arranged side-by-side. A third vibration pickup is provided between the inlet end of the first zero-sensing tube and the inlet end of the second zero-sensing tube, and a fourth vibration pickup is provided between the outlet end of the first zero-sensing tube and the outlet end of the second zero-sensing tube. A first solenoid valve is provided at the outlet end of both the first zero-sensing tube and the outlet end of the second zero-sensing tube. When the first solenoid valve is closed, the fluid medium inside the zero-sensing tube pair is in a static state. A vibrator, which is connected to the measuring tube pair and the zero-measuring tube pair, is used to drive the measuring tube pair and the zero-measuring tube pair to vibrate synchronously; The control module drives the exciter to achieve synchronous vibration of the measuring tube and the zero-measuring tube pair; the control module receives signals from the first and second vibration pickups and calculates the phase difference; the control module receives signals from the third and fourth vibration pickups and calculates the zero point; the control module compensates for the phase difference based on the zero point.

2. The high-precision Coriolis mass flow meter according to claim 1, characterized in that, A first manifold is installed at the inlet end of the measuring tube pair and the inlet end of the zero-measurement tube pair, and the inlet ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the first manifold; a second manifold is installed at the outlet end of the measuring tube pair and the outlet end of the zero-measurement tube pair, and the outlet ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the second manifold.

3. A high-precision Coriolis mass flow meter according to claim 2, characterized in that, A first flange is installed on the first manifold, a second flange is installed on the second manifold, and a support pipe is installed between the first flange and the second flange.

4. A high-precision Coriolis mass flow meter according to claim 1, characterized in that, The first solenoid valve is a normally closed solenoid valve, and the second solenoid valve is a normally open solenoid valve.

5. A high-precision Coriolis mass flow meter according to claim 1, characterized in that, Node plates are respectively provided at both ends of the measuring tube pair and at both ends of the zero-measurement tube pair, and the ends of the first measuring tube, the second measuring tube, the first zero-measurement tube, and the second zero-measurement tube are all connected to the node plates.

6. A high-precision Coriolis mass flow meter according to claim 1, characterized in that, The measuring tube pair and the zero measuring tube pair are covered with a protective shell, and the protective shell is covered with a heat insulation layer.

7. A high-precision Coriolis mass flow meter according to claim 1, characterized in that, The control module includes a control unit, a drive unit, a detection unit, and a display unit. The drive unit, the detection unit, and the display unit are all electrically connected to the control unit. The drive unit is electrically connected to the exciter. The detection unit is electrically connected to the first vibration pickup, the second vibration pickup, the third vibration pickup, and the fourth vibration pickup.

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