CN115077645A - Coriolis mass flow meter and measuring method - Google Patents

Abstract

The invention discloses a Coriolis mass flow measuring instrument and a measuring method. The control unit controls the first measuring pipe and the second measuring pipe to work in sequence, when the difference value of the mass flow obtained by measuring the first measuring pipe and the second measuring pipe exceeds the set threshold value, the control unit controls the first measuring pipe and the second measuring pipe to work in series, and the mass flow obtained by measuring after the first measuring pipe and the second measuring pipe work in series is determined. The invention integrates the two measuring tubes together, so that the two measuring tubes can work independently in sequence and in series, thereby not only improving the accuracy of mass flow measurement, but also reducing the requirements on cost and space.

Description

Coriolis mass flow measuring instrument and measuring method

technical field

The invention relates to the technical field of measuring equipment, in particular to a Coriolis mass flow measuring instrument and a measuring method.

Background technique

Coriolis mass flowmeter is a commonly used measurement device, which can determine a relatively accurate mass flow rate by detecting the Coriolis force or the vibration time phase difference corresponding to the Coriolis force.

As a measuring device, Coriolis mass flowmeter will also have uncontrollable errors after working for a long time. At present, there are many ways to correct this error, and the most widely used way is to connect two or more Coriolis mass flowmeters in series, and the mass flow data measured by the two Coriolis mass flowmeters After summarizing, mass flow rate with higher accuracy can be obtained. However, this method is costly and does not allow multiple Coriolis mass flowmeters to be installed in some limited spaces.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a Coriolis mass flow measuring instrument and a measuring method, so as to solve the problem of high cost and space requirements in the prior art after connecting multiple Coriolis mass flow meters in series.

In one aspect, an embodiment of the present invention provides a Coriolis mass flow measuring instrument, including: a control unit, a main pipeline, a first measuring tube and a second measuring tube;

The main pipeline includes an inlet pipe and an outlet pipe, the inlet end of the first measurement pipe and the inlet end of the second measurement pipe are connected with the inlet pipe, and the outlet end of the first measurement pipe and the outlet end of the second measurement pipe are connected with the outlet pipe ; At the same time, the outlet end of the first measuring tube is connected with the inlet end of the second measuring tube;

The control unit controls the first measurement tube and the second measurement tube to work in sequence, and when it is determined that the difference between the mass flow rates measured by the first measurement tube and the second measurement tube exceeds the set threshold, the control unit controls the first measurement tube and the second measurement tube. The two measuring tubes work in series, and the mass flow rate measured after the first measuring tube and the second measuring tube work in series is determined.

In a possible implementation manner, the inlet end of the first measuring pipe is provided with a first valve, the outlet end of the first measuring pipe is connected to the outlet pipe through a first connecting pipe, and a second valve is provided on the first connecting pipe.

In a possible implementation manner, the inlet end of the second measuring pipe is connected to the inlet pipe through a second connecting pipe, and the second connecting pipe is provided with a third valve; the outlet end of the second measuring pipe is connected to the inlet pipe through the third connecting pipe. The outlet pipe is connected, and the third connecting pipe is provided with a fourth valve.

In a possible implementation manner, the inlet end of the second measuring pipe is connected to the outlet end of the first measuring pipe through a fourth connecting pipe, and the fourth connecting pipe is provided with a fifth valve.

In a possible implementation manner, the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all solenoid valves, which are all electrically connected to the control unit.

In a possible implementation manner, an installation block is also included, and one end of the inlet pipe, one end of the outlet pipe, both ends of the first measurement pipe and both ends of the second measurement pipe are located inside the installation block.

In a possible implementation manner, a plurality of fixing sleeves are provided on the outer side of the installation block, and the first measuring tube and the part connecting the second measuring tube and the installation block are all sleeved in the fixing sleeves.

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

controlling the first measuring tube and the second measuring tube to work in sequence, and respectively determining the mass flow rate of the medium flowing through the first measuring tube and the second measuring tube;

determining the difference between the mass flow rates determined by the first measuring tube and the second measuring tube;

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

Determine the mass flow measured after the first measuring tube and the second measuring tube work in series.

In a possible implementation manner, determining the mass flow measured after the first measuring tube and the second measuring tube work in series may include: determining an average value of the mass flow measured by the first measuring tube and the second measuring tube.

The Coriolis mass flow measuring instrument and the measuring method in the present invention have the following advantages:

Integrating the two measuring tubes together enables the two measuring tubes to work individually or in series, which not only improves the measurement accuracy of the mass flow, but also reduces the cost and space requirements.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of the overall structure of a Coriolis mass flow measuring instrument provided by an embodiment of the present invention;

2 is a schematic diagram of a pipeline connection of a Coriolis mass flow measuring instrument provided in an embodiment of the present invention;

FIG. 3 is a flowchart of a measurement method of a Coriolis mass flow measuring instrument provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1 and 2 are schematic structural diagrams of a Coriolis mass flow measuring instrument provided in an embodiment of the present invention. The embodiment of the present invention provides a Coriolis mass flow measurement instrument, including: a control unit, a main pipeline 100, a first measurement tube 200 and a second measurement tube 300;

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

The control unit controls the first measurement tube 200 and the second measurement tube 300 to work in sequence, and when it is determined that the difference between the mass flow rates measured by the first measurement tube 200 and the second measurement tube 300 exceeds a set threshold, the control unit controls the first measurement tube 200 and the second measurement tube 300 to work in sequence. The measuring tube 200 and the second measuring tube 300 work in series, and the mass flow rate measured after the first measuring tube 200 and the second measuring tube 300 work in series is determined.

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

Under normal circumstances, the first measuring tube 200 and the second measuring tube 300 work in sequence under the control of the control unit, that is, the first measuring tube 200 works for a set time, such as one hour, and then switches to the second measuring tube 300 Work, and the first measuring tube 200 enters a standby state, and no medium flows through the first measuring tube 200 at this time. After both the first measurement tube 200 and the second measurement tube 300 work at least once, the control unit acquires the mass flow measured by the first measurement tube 200 and the second measurement tube 300, and performs a measurement on the mass flow measured by the two measurement tubes. In contrast, if the difference between the two exceeds the set threshold, there are two possibilities: one is that the mass flow measured by the two measuring tubes is correct, but the flow of the medium has changed greatly during this period. , Second, the flow of the medium has not changed greatly, and the mass flow measured by the two measuring tubes has a large error. In order to eliminate the influence of the first situation, the first measurement tube 200 and the second measurement tube 300 can be successively measured for multiple times, and the mass flow obtained by the multiple measurements can be tracked and recorded. The difference between the data that exceeds a certain percentage in the flow exceeds the set threshold, then it is considered that the difference between the mass flow measured by the first measuring tube 200 and the second measuring tube 300 exceeds the set threshold, and the control unit controls the first A measuring tube 200 and a second measuring tube 300 work in series.

When the two measuring tubes work in series, the possibility of a large measurement error occurring simultaneously in the two measuring tubes is very small, so the final mass flow data can be determined according to the mass flow measured by the two measuring tubes.

In the embodiment of the present invention, the above-mentioned set threshold may be a specific mass flow value, or may be a ratio, such as 1%.

In a possible embodiment, the inlet end of the first measuring tube 200 is provided with a first valve 201 , and the outlet end of the first measuring tube 200 is connected to the outlet tube 120 through the first connecting tube 210 , and the first connecting tube 210 is connected to the outlet tube 120 . A second valve 211 is provided.

Exemplarily, when the first measuring pipe 200 and the second measuring pipe 300 are in a 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 pipe 200 .

In the embodiment of the present invention, the connection between the inlet end of the first measuring pipe 200 and the inlet pipe 110 adopts a smooth transition, and the first connecting pipe 210 is also an arc-shaped pipe with a smooth transition, so that the medium can pass from the inlet relatively smoothly. The tube 110 enters the outlet tube 120 through the first measuring tube 200 . Meanwhile, both the first valve 201 and the second valve 211 are solenoid valves, which change their working states under the control of the control unit.

In a possible embodiment, the inlet end of the second measuring pipe 300 is connected to the inlet pipe 110 through the second connecting pipe 310 , and the second connecting pipe 310 is provided with a third valve 311 ; the outlet end of the second measuring pipe 300 The third connecting pipe 320 is connected with the outlet pipe 120 , and the third connecting pipe 320 is provided with a fourth valve 321 .

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 simultaneously controls the first valve 201 and the second valve 211 to close, The medium can then flow through the second measuring tube 300 .

In the embodiment of the present invention, both the second connecting pipe 310 and the third connecting pipe 320 are arc-shaped pipes with smooth transition, so that the medium can smoothly enter the outlet pipe 120 from the inlet pipe 110 through the second measuring pipe 300 . Meanwhile, the third valve 311 and the fourth valve 321 are both solenoid valves, which change their working states under the control of the control unit.

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

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 simultaneously controls the second valve 211 and the first valve 211 to open. The three valves 311 are closed, so that the medium can flow through the first measuring tube 200 and the second measuring tube 300 in sequence.

In the embodiment of the present invention, the fourth connecting pipe 220 is an arc-shaped pipe with smooth transition, so that the medium can enter the inlet end of the second measuring pipe 300 from the outlet end of the first measuring pipe 200 relatively smoothly. Meanwhile, the fifth valve 22 is a solenoid valve, which changes the working state under the control of the control unit.

In a possible embodiment, an installation block 400 is further included, and one end of the inlet pipe 110 , one end of the outlet pipe 120 , both ends of the first measurement pipe 200 and both ends of the second measurement pipe 300 are located inside the installation block 400 .

Exemplarily, the mounting block 400 is used to be arranged on other fixed objects, such as a pipe base, ground, etc., to ensure the stability of the Coriolis mass flow measuring instrument in the present invention.

In a possible embodiment, a plurality of fixing sleeves are provided on the outer surface of the mounting block 400 , and the parts of the first measuring tube 200 and the second measuring tube 300 connected to the mounting block 400 are all sleeved in the fixing sleeves.

Exemplarily, the fixing sleeve can be integrally formed with the mounting block 400, so that the two measuring tubes and the mounting block 400 can be stably connected, and will not be disengaged due to prolonged vibration.

The embodiment of the present invention also provides a Coriolis mass flow measurement method, as shown in FIG. 3 , the method includes the following steps:

S300, controlling the first measuring tube 200 and the second measuring tube 300 to work in sequence, and respectively determining the mass flow rate of the medium flowing through the first measuring tube 200 and the second measuring tube 300;

S310, determining the difference between the mass flow rates determined by the first measuring tube 200 and the second measuring tube 300;

S320, when it is determined that the difference between the mass flow rates measured by the first measurement tube 200 and the second measurement tube 300 exceeds a set threshold, control the first measurement tube 200 and the second measurement tube 300 to work in series;

S330: Determine the mass flow rate measured after the first measuring tube 200 and the second measuring tube 300 work in series.

In the above step S330, the average value of the mass flow measured by the first measurement tube 200 and the second measurement tube 300 is determined, and the average value is used as the final mass flow data.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (9)

1. A coriolis mass flow meter comprising: a control unit, a main pipeline (100), a first measuring pipe (200) and a second measuring pipe (300);

the main pipeline (100) comprises an inlet pipe (110) and an outlet pipe (120), the inlet end of the first measuring pipe (200) and the inlet end of the second measuring pipe (300) are both connected with the inlet pipe (110), and the outlet end of the first measuring pipe (200) and the outlet end of the second measuring pipe (300) are both connected with the outlet pipe (120); while the outlet end of the first measuring tube (200) is connected to the inlet end of the second measuring tube (300);

the control unit control first survey buret (200) and second survey buret (300) and work in proper order, when confirming first survey buret (200) and second survey buret (300) measure when the difference of the mass flow who obtains surpass the threshold value of settlement, the control unit control first survey buret (200) and second survey buret (300) series connection work, and confirm first survey buret (200) and second survey buret (300) series connection work back measurement mass flow who obtains.

2. The coriolis mass flow meter of claim 1, characterized in that an inlet end of the first measurement tube (200) is provided with a first valve (201), an outlet end of the first measurement tube (200) is connected to the outlet tube (120) by a first connection tube (210), and a second valve (211) is provided on the first connection tube (210).

3. The coriolis mass flow meter of claim 2, characterized in that an inlet end of said second measurement tube (300) is connected to said inlet tube (110) by a second connection tube (310), said second connection tube (310) having a third valve (311) disposed thereon;

the outlet end of the second measuring pipe (300) is connected with the outlet pipe (120) through a third connecting pipe (320), and a fourth valve (321) is arranged on the third connecting pipe (320).

4. Coriolis mass flow meter according to claim 3, characterized in that the inlet end of the second measuring tube (300) is connected to the outlet end of the first measuring tube (200) by means of a fourth connecting tube (220), a fifth valve (221) being arranged on the fourth connecting tube (220).

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

6. The coriolis mass flow meter of claim 1, further comprising a mounting block (400), one end of the inlet tube (110), one end of the outlet tube (120), both ends of the first measurement tube (200), and both ends of the second measurement tube (300) being located inside the mounting block (400).

7. The coriolis mass flow meter of claim 6, characterized in that a plurality of retaining sleeves are provided on the outer side of the mounting block (400), and the portions of said first measurement tube (200) and said second measurement tube (300) that are connected to said mounting block (400) are each retained in said retaining sleeves.

8. A measurement method applied to the coriolis mass flow meter of any one of claims 1 to 7, characterized by comprising:

controlling the first measuring pipe (200) and the second measuring pipe (300) to work in sequence and determining the mass flow of the medium flowing through the first measuring pipe (200) and the second measuring pipe (300) respectively;

determining the difference between the determined mass flow rates of the first measuring tube (200) and the second measuring tube (300);

when the difference of the mass flow measured by the first measuring pipe (200) and the second measuring pipe (300) is determined to exceed a set threshold value, controlling the first measuring pipe (200) and the second measuring pipe (300) to work in series;

and determining the mass flow measured after the first measuring pipe (200) and the second measuring pipe (300) are connected in series.

9. The coriolis mass flow measurement method of claim 8, wherein said determining a mass flow measured after said first (200) and second (300) measurement tubes are operated in series comprises:

an average of the mass flow measured by the first measuring tube (200) and the second measuring tube (300) is determined.

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