Coriolis mass flowmeter and measurement method

Abstract

The present invention discloses a Coriolis mass flow measuring instrument and a measuring method. The measuring instrument includes a control unit, a main pipeline, a first measuring tube, and a second measuring tube. The control unit controls the first measuring tube and the second measuring tube to work sequentially. When it is determined that the difference between the mass flows measured by the first measuring tube and the second measuring tube exceeds a set threshold, the control unit controls the first measuring tube and the second measuring tube to work in series, and determines the mass flow measured after the first measuring tube and the second measuring tube work in series. The present invention integrates two measuring tubes, enabling the two measuring tubes to work independently sequentially and also in series, not only improving the measurement accuracy of the mass flow, but also reducing the requirements for cost and space.

Description

Technical Field

[0001] The present invention relates to the technical field of metering devices, and particularly to a Coriolis mass flowmeter and a measurement method. Background Art

[0002] A Coriolis mass flowmeter is a commonly used metering device, and it can determine a relatively accurate mass flow by detecting the Coriolis force or the vibration time phase difference corresponding to the Coriolis force.

[0003] As a metering device, the Coriolis mass flowmeter will also have uncontrollable errors after long-term operation. At present, there are many ways to correct such errors. Among them, the more commonly used method is to connect two or more Coriolis mass flowmeters in series. After the mass flow data measured by the two Coriolis mass flowmeters are aggregated, a mass flow with higher accuracy can be obtained. However, using this method requires a very high cost, and it is not allowed to install multiple Coriolis mass flowmeters in some limited spaces. Summary of the Invention

[0004] The embodiments of the present invention provide a Coriolis mass flowmeter and a measurement method, which are used to solve the problems of high cost and high space requirements in the prior art when multiple Coriolis mass flowmeters are connected in series.

[0005] On the one hand, the embodiments of the present invention provide a Coriolis mass flowmeter, including: a control unit, a main pipeline, a first measuring pipe, and a second measuring pipe;

[0006] The main pipeline includes an inlet pipe and an outlet pipe. The inlet ends of the first measuring pipe and the second measuring pipe are both connected to the inlet pipe, and the outlet ends of the first measuring pipe and the second measuring pipe are both connected to the outlet pipe; at the same time, the outlet end of the first measuring pipe is connected to the inlet end of the second measuring pipe;

[0007] The control unit controls the first measuring pipe and the second measuring pipe to work in sequence. When it is determined that the difference between the mass flows measured by the first measuring pipe and the second measuring pipe exceeds a set threshold, the control unit controls the first measuring pipe and the second measuring pipe to work in series, and determines the mass flow measured after the first measuring pipe and the second measuring pipe work in series.

[0008] In a possible implementation manner, a first valve is arranged at the inlet end of the first measuring pipe. The outlet end of the first measuring pipe is connected to the outlet pipe through a first connecting pipe, and a second valve is arranged on the first connecting pipe.

[0009] In a possible implementation, the inlet end of the second measuring tube is connected to the inlet tube through a second connecting tube, and a third valve is provided on the second connecting tube; the outlet end of the second measuring tube is connected to the outlet tube through a third connecting tube, and a fourth valve is provided on the third connecting tube.

[0010] In a possible implementation, the inlet end of the second measuring tube is connected to the outlet end of the first measuring tube through a fourth connecting tube, and a fifth valve is provided on the fourth connecting tube.

[0011] In a possible implementation, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are all solenoid valves, and they are all electrically connected to the control unit.

[0012] In a possible implementation, it further includes a mounting block, and one end of the inlet tube, one end of the outlet tube, both ends of the first measuring tube, and both ends of the second measuring tube are all located inside the mounting block.

[0013] In a possible implementation, a plurality of fixing sleeves are provided on the outer side surface of the mounting block, and the portions of the first measuring tube and the second measuring tube connected to the mounting block are all sleeved in the fixing sleeves.

[0014] On the other hand, the embodiment of the present invention provides a Coriolis mass flow measurement method, including:

[0015] Controlling the first measuring tube and the second measuring tube to work in sequence, and respectively determining the mass flow rates of the media flowing through the first measuring tube and the second measuring tube;

[0016] Determining the difference between the mass flow rates determined by the first measuring tube and the second measuring tube;

[0017] When it is determined that the difference between the mass flow rates measured by the first measuring tube and the second measuring tube exceeds a set threshold, controlling the first measuring tube and the second measuring tube to work in series;

[0018] Determining the mass flow rate measured after the first measuring tube and the second measuring tube work in series.

[0019] In a possible implementation, determining the mass flow rate measured after the first measuring tube and the second measuring tube work in series may include: determining the average value of the mass flow rates measured by the first measuring tube and the second measuring tube.

[0020] The Coriolis mass flow measurement instrument and measurement method in the present invention have the following advantages:

[0021] Integrating the two measuring tubes together enables the two measuring tubes to work independently in sequence and also in series, not only improving the measurement accuracy of the mass flow rate, but also reducing the requirements for cost and space. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the Coriolis mass flow meter provided by the embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the pipeline connection of the Coriolis mass flow meter provided by the embodiment of the present invention;

[0025] Figure 3 It is a flowchart of the measurement method of the Coriolis mass flow meter provided by the embodiment of the present invention. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Figure 1 and Figure 2 It is a schematic diagram of the structure of the Coriolis mass flow meter provided by the embodiment of the present invention. The embodiment of the present invention provides a Coriolis mass flow meter, including: a control unit, a main pipeline 100, a first measuring pipe 200, and a second measuring pipe 300;

[0028] The main pipeline 100 includes an inlet pipe 110 and an outlet pipe 120. The inlet ends of the first measuring pipe 200 and the second measuring pipe 300 are both connected to the inlet pipe 110, and the outlet ends of the first measuring pipe 200 and the second measuring pipe 300 are both connected to the outlet pipe 120; at the same time, the outlet end of the first measuring pipe 200 is connected to the inlet end of the second measuring pipe 300;

[0029] The control unit controls the first measuring pipe 200 and the second measuring pipe 300 to work in sequence. When it is determined that the difference between the mass flows measured by the first measuring pipe 200 and the second measuring pipe 300 exceeds a set threshold, the control unit controls the first measuring pipe 200 and the second measuring pipe 300 to work in series, and determines the mass flow measured after the first measuring pipe 200 and the second measuring pipe 300 work in series.

[0030] Exemplarily, both the first measuring tube 200 and the second measuring tube 300 are of U-shaped structures, including an arc tube and a straight tube, and the straight tubes are arranged at both ends of the arc tube. The vibration units for driving the first measuring tube 200 and the second measuring tube 300 to vibrate are both arranged at both ends of the above-mentioned arc tube. Therefore, the mass flow rate is mainly measured by the vibration of the arc tube.

[0031] Under normal circumstances, the first measuring tube 200 and the second measuring tube 300 work sequentially under the control of the control unit, that is, the first measuring tube 200 works for a set time, for example, after one hour, it switches to the second measuring tube 300 to work, and the first measuring tube 200 enters the standby state. At this time, no medium flows through the first measuring tube 200. After both the first measuring tube 200 and the second measuring tube 300 have worked at least once, the control unit obtains the mass flow rates measured by the first measuring tube 200 and the second measuring tube 300, and compares the mass flow rates measured by the two measuring tubes. If the difference between the two exceeds the set threshold, there are two possibilities: one is that the mass flow rates measured by the two measuring tubes are both correct, but the flow condition of the medium has changed greatly during this period; the other is that the flow condition of the medium has not changed greatly, but there is a large error in the mass flow rates measured by the two measuring tubes. In order to eliminate the influence of the first situation, the first measuring tube 200 and the second measuring tube 300 can be measured multiple times in sequence, and the mass flow rates obtained from the multiple measurements are tracked and recorded. If the differences of the data of more than a certain proportion among the mass flow rates obtained from the multiple measurements exceed the set threshold, it is considered that the difference between the mass flow rates measured by the first measuring tube 200 and the second measuring tube 300 exceeds the set threshold, and the control unit controls the first measuring tube 200 and the second measuring tube 300 to work in series.

[0032] After the two measuring tubes work in series, the possibility of both measuring tubes having large measurement errors at the same time is very small. Therefore, the final mass flow rate data can be determined according to the mass flow rates measured by the two measuring tubes.

[0033] In the embodiment of the present invention, the above set threshold can be a specific mass flow rate value or a ratio, such as 1%.

[0034] In a possible embodiment, a first valve 201 is arranged at the inlet end of the first measuring tube 200. The outlet end of the first measuring tube 200 is connected to the outlet pipe 120 through a first connecting pipe 210, and a second valve 211 is arranged on the first connecting pipe 210.

[0035] Exemplarily, when the first measuring tube 200 and the second measuring tube 300 are in the sequential working state, the control unit controls the first valve 201 and the second valve 211 to open, so that the medium can flow through the first measuring tube 200.

[0036] In an embodiment of the present invention, the connection between the inlet end of the first measuring tube 200 and the inlet tube 110 adopts a smooth transition. At the same time, the first connecting tube 210 is also a smooth-transition arc-shaped tube, enabling the medium to smoothly flow from the inlet tube 110 through the first measuring tube 200 into the outlet tube 120. Meanwhile, the first valve 201 and the second valve 211 are both solenoid valves, and their working states are changed under the control of the control unit.

[0037] In a possible embodiment, the inlet end of the second measuring tube 300 is connected to the inlet tube 110 through a second connecting tube 310, and a third valve 311 is provided on the second connecting tube 310; the outlet end of the second measuring tube 300 is connected to the outlet tube 120 through a third connecting tube 320, and a fourth valve 321 is provided on the third connecting tube 320.

[0038] Exemplarily, when the first measuring tube 200 and the second measuring tube 300 are in a sequential working state, the control unit controls the third valve 311 and the fourth valve 321 to open, and at the same time controls the first valve 201 and the second valve 211 to close, so that the medium can flow through the second measuring tube 300.

[0039] In an embodiment of the present invention, both the second connecting tube 310 and the third connecting tube 320 are smooth-transition arc-shaped tubes, enabling the medium to smoothly flow from the inlet tube 110 through the second measuring tube 300 into the outlet tube 120. Meanwhile, the third valve 311 and the fourth valve 321 are both solenoid valves, and their working states are changed under the control of the control unit.

[0040] In a possible embodiment, the inlet end of the second measuring tube 300 is connected to the outlet end of the first measuring tube 200 through a fourth connecting tube 220, and a fifth valve 221 is provided on the fourth connecting tube 220.

[0041] Exemplarily, when the first measuring tube 200 and the second measuring tube 300 are in a series working state, the control unit controls the first valve 201, the fifth valve 221, and the fourth valve 321 to open, and at the same time controls the second valve 211 and the third valve 311 to close, so that the medium can flow through the first measuring tube 200 and the second measuring tube 300 in sequence.

[0042] In an embodiment of the present invention, the fourth connecting tube 220 is a smooth-transition arc-shaped tube, enabling the medium to smoothly enter the inlet end of the second measuring tube 300 from the outlet end of the first measuring tube 200. Meanwhile, the fifth valve 22 is a solenoid valve, and its working state is changed under the control of the control unit.

[0043] In a possible embodiment, it further includes a mounting block 400. One end of the inlet pipe 110, one end of the outlet pipe 120, both ends of the first measuring pipe 200, and both ends of the second measuring pipe 300 are located inside the mounting block 400.

[0044] Exemplarily, the mounting block 400 is used to be set on other fixtures, such as pipe sockets, the ground, etc., to ensure the stability of the Coriolis mass flow measuring instrument in the present invention.

[0045] In a possible embodiment, a plurality of fixing sleeves are provided on the outer side surface of the mounting block 400. The portions of the first measuring pipe 200 and the second measuring pipe 300 connected to the mounting block 400 are both sleeved in the fixing sleeves.

[0046] Exemplarily, the fixing sleeves can be integrally formed with the mounting block 400, so that a stable connection can be achieved between the two measuring pipes and the mounting block 400, and they will not be separated due to long-term vibration.

[0047] The embodiment of the present invention also provides a Coriolis mass flow measurement method, as Figure 3 shown, this method includes the following steps:

[0048] S300. Control the first measuring pipe 200 and the second measuring pipe 300 to work in sequence, and respectively determine the mass flow rates of the media flowing through the first measuring pipe 200 and the second measuring pipe 300;

[0049] S310. Determine the difference between the mass flow rates determined by the first measuring pipe 200 and the second measuring pipe 300;

[0050] S320. When it is determined that the difference between the mass flow rates measured by the first measuring pipe 200 and the second measuring pipe 300 exceeds a set threshold, control the first measuring pipe 200 and the second measuring pipe 300 to work in series;

[0051] S330. Determine the mass flow rate measured after the first measuring pipe 200 and the second measuring pipe 300 work in series.

[0052] In the above step S330, determine the average value of the mass flow rates measured by the first measuring pipe 200 and the second measuring pipe 300, and use this average value as the final mass flow rate data.

[0053] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. Coriolis mass flowmeter, characterized in that, Including: A control unit, a main pipeline (100), a first measurement pipeline (200) and a second measurement pipeline (300); The main pipeline (100) includes an inlet pipe (110) and an outlet pipe (120). The inlet ends of the first measurement pipeline (200) and the second measurement pipeline (300) are both connected to the inlet pipe (110), and the outlet ends of the first measurement pipeline (200) and the second measurement pipeline (300) are both connected to the outlet pipe (120); meanwhile, the outlet end of the first measurement pipeline (200) is connected to the inlet end of the second measurement pipeline (300); The control unit controls the first measurement pipeline (200) and the second measurement pipeline (300) to work in sequence. When it is determined that the difference between the mass flows measured by the first measurement pipeline (200) and the second measurement pipeline (300) exceeds a set threshold, the control unit controls the first measurement pipeline (200) and the second measurement pipeline (300) to work in series, and determines the average value of the mass flows measured after the first measurement pipeline (200) and the second measurement pipeline (300) work in series, and uses this average value as the final mass flow data, thereby improving the measurement accuracy of the mass flow.

2. The Coriolis mass flowmeter according to claim 1, characterized in that, A first valve (201) is provided at the inlet end of the first measurement pipeline (200). The outlet end of the first measurement pipeline (200) is connected to the outlet pipe (120) through a first connecting pipe (210), and a second valve (211) is provided on the first connecting pipe (210).

3. The Coriolis mass flowmeter according to claim 2, characterized in that, The inlet end of the second measurement pipeline (300) is connected to the inlet pipe (110) through a second connecting pipe (310), and a third valve (311) is provided on the second connecting pipe (310); The outlet end of the second measurement pipeline (300) is connected to the outlet pipe (120) through a third connecting pipe (320), and a fourth valve (321) is provided on the third connecting pipe (320).

4. The Coriolis mass flow meter according to claim 3, characterized in that, The inlet end of the second measurement pipeline (300) is connected to the outlet end of the first measurement pipeline (200) through a fourth connecting pipe (220), and a fifth valve (221) is provided on the fourth connecting pipe (220).

5. The Coriolis mass flowmeter according to claim 4, characterized in that, The first valve (201), the second valve (211), the third valve (311), the fourth valve (321) and the fifth valve (221) are all solenoid valves, and they are all electrically connected to the control unit.

6. The Coriolis mass flowmeter according to claim 1, characterized in that, It further includes a mounting block (400). One end of the inlet pipe (110), one end of the outlet pipe (120), both ends of the first measurement pipeline (200) and both ends of the second measurement pipeline (300) are located inside the mounting block (400).

7. The Coriolis mass flowmeter according to claim 6, characterized in that, A plurality of fixing sleeves are provided on the outer side surface of the mounting block (400). The parts of the first measurement pipeline (200) and the second measurement pipeline (300) connected to the mounting block (400) are all sleeved in the fixing sleeves.

8. A measurement method applied to the Coriolis mass flowmeter according to any one of claims 1-7, characterized in that, Including: Controlling the first measurement pipeline (200) and the second measurement pipeline (300) to work in sequence, and respectively determining the mass flows of the media flowing through the first measurement pipeline (200) and the second measurement pipeline (300); Determine the difference in the mass flow rates determined by the first measuring tube (200) and the second measuring tube (300); When the difference in the mass flow rates measured by the first measuring tube (200) and the second measuring tube (300) exceeds a set threshold, control the first measuring tube (200) and the second measuring tube (300) to operate in series; Determine the mass flow rate measured after the first measuring tube (200) and the second measuring tube (300) operate in series.

9. The measuring method of the Coriolis mass flowmeter according to claim 8, characterized in that, The determining the mass flow rate measured after the first measuring tube (200) and the second measuring tube (300) operate in series includes: Determine the average value of the mass flow rates measured by the first measuring tube (200) and the second measuring tube (300).

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