CN114910142A - Detection method for Coriolis mass flowmeter - Google Patents
Detection method for Coriolis mass flowmeter Download PDFInfo
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- CN114910142A CN114910142A CN202210586813.8A CN202210586813A CN114910142A CN 114910142 A CN114910142 A CN 114910142A CN 202210586813 A CN202210586813 A CN 202210586813A CN 114910142 A CN114910142 A CN 114910142A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention discloses a detection method for a Coriolis mass flowmeter, which comprises the following steps: collecting vibration signals of the inlet end and the outlet end of each measuring tube, wherein the number of the measuring tubes is at least two, and the inlet end and the outlet end of each measuring tube are respectively provided with at least one vibration detection unit; determining at least two mass flow data according to the collected vibration signals at the inlet end and the outlet end of the measuring pipe, and determining whether the difference value of the at least two mass flow data is within a set error range; if the difference between at least two mass flow data is not within the set error range, a failure of the coriolis mass flow meter is determined. The invention sets the number of the measuring tubes as at least two, and the corresponding mass flow is determined by collecting and processing the vibration signals of the at least two measuring tubes, thereby overcoming the defect of relying on the same measuring tube in the prior art and improving the precision of the mass flow measurement result.
Description
Technical Field
The invention relates to the technical field of metering equipment, in particular to a detection method for a Coriolis mass flowmeter.
Background
The coriolis mass flowmeter is a metering device for determining mass flow by measuring coriolis force, and has high accuracy and stability and a wide application range.
As a metering device, failure is inevitable, and various failure detection methods for detecting a failure of a coriolis mass flowmeter have been provided in the prior art. CN110514259A, chinese patent application for patent discloses a method for detecting a coriolis flowmeter with high accuracy, wherein at least two pairs of vibration detecting elements are disposed on a measuring tube, and at least two mass flow rates can be determined by detecting the vibrations at the inlet and outlet of the measuring tube and determining at least two time differences, and then whether the coriolis mass flowmeter has a fault can be determined by processing the at least two mass flow rates. Although the patent has lower cost and higher precision, a plurality of groups of vibration detection elements are arranged on the same measuring tube, and the same measuring tube can have certain measurement errors under the influence of factors such as manufacturing process, use environment and the like, so that signals obtained by the plurality of groups of vibration detection elements can contain the same error data. If the mass flow determined from these signals is processed, the results obtained must also contain erroneous data of the measuring tube itself, which adversely affects the accuracy of the measurement.
Disclosure of Invention
The embodiment of the invention provides a detection method for a Coriolis mass flowmeter, which is used for solving the problem that in the prior art, a plurality of groups of vibration detection units are arranged on the same measuring pipe, so that the adverse effect is caused on the measuring precision.
In one aspect, an embodiment of the present invention provides a detection method for a coriolis mass flowmeter, including:
collecting vibration signals of the inlet end and the outlet end of each measuring tube, wherein the number of the measuring tubes is at least two, and the inlet end and the outlet end of each measuring tube are respectively provided with at least one vibration detection unit;
determining at least two mass flow data according to the collected vibration signals at the inlet end and the outlet end of the measuring pipe, and determining whether the difference value of the at least two mass flow data is within a set error range;
if the difference between at least two mass flow data is not within the set error range, a failure of the coriolis mass flow meter is determined.
In one possible embodiment, the mass flow through the measuring tube is determined from the vibration signals at the inlet end and at the outlet end of the same measuring tube when at least two mass flow data are determined.
In a possible embodiment, when determining at least two mass flow data, two vibration detection units are provided at the inlet end and the outlet end of each measuring tube, two mass flow data are determined from the vibration signals at the inlet end and the outlet end of the same measuring tube, and after averaging the two mass flow data, a difference is determined from the average of the mass flow data determined from the vibration signals of the other measuring tubes.
In one possible embodiment, when determining the at least two mass flow data, the respective mass flow is determined from the vibration signal at the inlet end of one measuring tube and the vibration signal at the outlet end of the other measuring tube.
In one possible embodiment, when determining at least two mass flow data, two vibration detection units are provided at the inlet end and the outlet end of each measuring tube, two mass flow data are determined from the vibration signal at the inlet end of one measuring tube and the vibration signal at the outlet end of the other measuring tube, and after averaging the two mass flow data, a difference is determined from the average of the mass flow data determined from the average of the remaining two mass flow data.
In a possible embodiment, the operation of detecting the vibration signals at the inlet and outlet ends of the measuring tubes is carried out simultaneously with the simultaneous operation of at least two measuring tubes.
In a possible embodiment, at least two measuring tubes are operated in succession, and the vibration signals at the inlet end and the outlet end are detected again when the measuring tubes are in the operating state.
The detection method for the Coriolis mass flowmeter has the following advantages:
the quantity of surveying buret sets up to at least two, confirms the mass flow who corresponds through the collection and the processing to the vibration signal of these at least two survey burets, has overcome the drawback that relies on same survey buret among the prior art, has improved the precision of mass flow measurement result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a sensing method for a Coriolis mass flow meter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sensing system for a Coriolis mass flow meter in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the interior of a main pipe according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flow chart of a detection method for a coriolis mass flowmeter according to an embodiment of the present invention. The embodiment of the invention provides a detection method for a Coriolis mass flowmeter, which comprises the following steps:
s100, collecting vibration signals of the inlet end and the outlet end of the measuring pipe 300, wherein the number of the measuring pipe 300 is at least two, and the inlet end and the outlet end of each measuring pipe 300 are respectively provided with at least one vibration detection unit.
Illustratively, both ends of the measuring pipe 300 are respectively connected to the main pipe 200, and the joint of the main pipe 200 and the measuring pipe 300 is provided with a stabilizing block 100 for protecting the joint of the main pipe 200 and the measuring pipe 300. The medium flowing in the main pipe 200 is distributed into at least two measuring tubes 300, and the mass flow in each measuring tube 300 is substantially equal.
In the embodiment of the present invention, the measuring tube 300 is an arc-shaped tube, the vibration detecting units are all disposed inside the arc-shaped tube, and the vibration detecting units at the inlet end and the outlet end are symmetrically disposed on both sides of the central axis of the measuring tube 300. When the number of the vibration detecting units at the inlet end and the outlet end is two or more, one vibration detecting unit at the inlet end and one vibration detecting unit at the outlet end are in a group, and two vibration detecting units in the group are respectively located at two symmetrical positions inside the measuring pipe 300.
And S110, determining at least two mass flow data according to the collected vibration signals at the inlet end and the outlet end of the measuring pipe 300, and determining whether the difference value of the at least two mass flow data is within a set error range.
Illustratively, when the fluid medium flows in the measurement pipe 300, the measurement pipe 300 as a whole is in a vibrating state under the drive of the vibrating unit, and the vibration conditions at the inlet end and the outlet end of the measurement pipe 300 under the influence of the fluid medium are not exactly the same. Specifically, there is a difference in vibration phase, the magnitude of which is proportional to the mass flow through the measurement tube 300, so that the corresponding mass flow data can be determined directly from the phase difference of the vibration signals at the inlet and outlet ends of the measurement tube 300.
And S120, if the difference value of at least two mass flow data is not within the set error range, determining that the Coriolis mass flowmeter has a fault.
Illustratively, since the physical parameters of the measuring tubes 300, including the curvature, thickness, etc., are not exactly the same, even though the same mass flow rate is flowing, the mass flow rates determined from the vibration signals of the different measuring tubes 300 are not exactly the same, and there is a difference more or less greater than zero, and as long as this difference is within an acceptable range, i.e., a set error range, the coriolis mass flowmeter is determined to be in a normal state. The set error range may be a specific mass flow difference or a percentage.
In the embodiment of the present invention, the plurality of measuring tubes 300 of the same coriolis mass flowmeter are individually operated, so that the plurality of measuring tubes 300 are less likely to malfunction at the same time, and if only one of the measuring tubes 300 is in a normal operating state, the operating state of the other measuring tubes 300 can be judged to be normal based on the mass flow rate determined by the measuring tube 300. If the difference between the mass flow rates determined from the vibration signals of the measuring tubes 300 is too large, which indicates that at least one measuring tube 300 is faulty, an alarm can be sent by an alarm device to remind maintenance personnel to further check the coriolis mass flowmeter.
In one possible embodiment, the mass flow through the measuring tube 300 is determined from the vibration signals at the inlet end and the outlet end of the same measuring tube 300 when determining at least two mass flow data.
For example, when determining the mass flow rate from the vibration signals at the inlet end and the outlet end of the same measuring tube 300, it is necessary to use the vibration signals collected by two vibration detecting units in the same group. If only one vibration detection unit is provided at both the inlet end and the outlet end of the measuring tube 300, the corresponding mass flow is determined from the vibration signals detected by the two vibration detection units.
When the inlet end and the outlet end of each measuring pipe 300 are respectively provided with two vibration detection units, two mass flow data are determined according to vibration signals of the inlet end and the outlet end of the same measuring pipe 300, and after the two mass flow data are averaged, a difference value is determined with the mass flow data average value determined according to the vibration signals of other measuring pipes 300. For example, a vibration detecting unit I, a vibration detecting unit II, a vibration detecting unit III and a vibration detecting unit IV are arranged on one measuring pipe 300 in the medium flow direction in this order, wherein the vibration detecting unit I and the vibration detecting unit II are located at the inlet end of the measuring pipe 300, and the vibration detecting unit III and the vibration detecting unit IV are located at the outlet end of the measuring pipe 300. Meanwhile, the vibration detection unit I and the vibration detection unit IV are in a group, and symmetrically located on both sides of the central axis of the measurement pipe 300, and the vibration detection unit II and the vibration detection unit III are in a group, and also symmetrically located on both sides of the central axis of the measurement pipe 300. When mass flow is determined, mass flow data I are determined from vibration signals acquired by the vibration detection unit I and the vibration detection unit IV, mass flow data II are determined from vibration signals acquired by the vibration detection unit II and the vibration detection unit III, and an average value of the mass flow data I and the mass flow data II is obtained as mass flow data of a medium flowing through the measurement pipe 300. In the same way, mass flow data of the medium flowing through the other measuring tubes 300 can be determined.
In one possible embodiment, when determining at least two mass flow data, the respective mass flow is determined from the vibration signal at the inlet end of one measuring tube 300 and the vibration signal at the outlet end of the other measuring tube 300.
For example, when the mass flow rate is determined by the vibration signals of the same measuring tube 300, error data of the measuring tube 300 itself is inevitably introduced, so that the present embodiment uses the vibration detecting units at the corresponding positions of the two measuring tubes 300 as a group, and determines the corresponding mass flow rate according to the vibration signals acquired by the two vibration detecting units in the group, in such a way that the information of the plurality of measuring tubes 300 can be integrated together, thereby avoiding the introduction of fixed error data. If only one vibration detection unit is provided at each of the inlet and outlet ends of the measuring tubes 300, the corresponding mass flow is determined from the vibration signal at the inlet end of one measuring tube 300 and the vibration signal at the outlet end of the other measuring tube 300.
When two vibration detecting units are provided at the inlet end and the outlet end of each measuring pipe 300, two mass flow data are determined according to a vibration signal at the inlet end of one measuring pipe 300 and a vibration signal at the outlet end of the other measuring pipe 300, and after averaging the two mass flow data, a difference value is determined with the average value of the mass flow data determined according to the vibration signals of the other measuring pipes 300. For example, a vibration detecting unit I, a vibration detecting unit II, a vibration detecting unit III and a vibration detecting unit IV are arranged on one measuring pipe 300 in the medium flow direction in this order, wherein the vibration detecting unit I and the vibration detecting unit II are located at the inlet end of the measuring pipe 300, and the vibration detecting unit III and the vibration detecting unit IV are located at the outlet end of the measuring pipe 300. A vibration detection unit V, a vibration detection unit VI, a vibration detection unit VII and a vibration detection unit VIII are arranged in sequence on the other measuring tube 300 in the direction of flow of the medium, wherein the vibration detection unit V and the vibration detection unit VI are located at the inlet end of the measuring tube 300 and the vibration detection unit VII and the vibration detection unit VIII are located at the outlet end of the measuring tube 300. In the present embodiment, the vibration detection unit I and the vibration detection unit VIII, the vibration detection unit II and the vibration detection unit VII, the vibration detection unit III and the vibration detection unit VI, the vibration detection unit IV, and the vibration detection unit V are respectively one set.
When mass flow is determined, mass flow data I are determined according to vibration signals acquired by a vibration detection unit I and a vibration detection unit VIII, mass flow data II are determined according to vibration signals acquired by a vibration detection unit II and a vibration detection unit VII, mass flow data III are determined according to vibration signals acquired by a vibration detection unit III and a vibration detection unit VI, mass flow data IV are determined according to vibration signals acquired by a vibration detection unit IV and a vibration detection unit V, and the average value of the mass flow data I and the mass flow data II and the average value of the mass flow data III and the mass flow data IV are obtained. The difference in mass flow data can be determined from the two averages.
In a possible embodiment, the acquisition of the vibration signals at the inlet and outlet ends of the measuring tubes 300 takes place simultaneously when at least two measuring tubes 300 are operated simultaneously.
Illustratively, the main pipe 200 is provided with a flow direction switching device on a side thereof near the inlet end of the measurement pipe 300, as shown in fig. 3. The device comprises a driving unit 210 and a guide plate 230, wherein a splitter plate 220 is arranged inside a main pipe 200, the splitter plate 220 divides a medium flowing through the main pipe 200 into a plurality of branches, the number of the branches is the same as that of a measuring pipe 300, and each branch flows into one measuring pipe 300 in a one-to-one correspondence mode. The guide plate 230 is rotatably provided at the end of the dividing plate 220, and the guide plate 230 is rotated by the driving unit 210 to change the state of the medium flowing into the measuring pipe 300.
In the embodiment of the present invention, the driving unit 210 is a servo motor which controls the switching state of the guide plates 230 to three, wherein the ends of the guide plates 230 are abutted against the opposite sides of the main pipe 200 in two states to make the medium flow into the different two measuring pipes 300, and in the two states, the measuring pipes 300 are in the sequentially operated state, that is, only one measuring pipe 300 is in the operated state at the same time. In the remaining state, the flow guide plate 230 is parallel to the flow direction of the medium, so that the medium can flow into both measuring tubes 300 simultaneously, in which state the measuring tubes 300 are in simultaneous operation.
When a plurality of measuring tubes 300 are operated simultaneously, the above-described method can be directly used to diagnose a failure of the coriolis mass flowmeter. When a plurality of measuring tubes 300 work in sequence, the vibration signals collected by each measuring tube 300 can be stored, and after each measuring tube 300 works once, the fault detection work of the coriolis mass flowmeter is carried out.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.
Claims (7)
1. A sensing method for a coriolis mass flowmeter, comprising:
collecting vibration signals of an inlet end and an outlet end of a measuring pipe (300), wherein the number of the measuring pipes (300) is at least two, and the inlet end and the outlet end of each measuring pipe (300) are respectively provided with at least one vibration detection unit;
determining at least two mass flow data according to the acquired vibration signals at the inlet end and the outlet end of the measuring pipe (300), and determining whether the difference value of the at least two mass flow data is within a set error range;
and if the difference value of at least two mass flow data is not within a set error range, determining that the Coriolis mass flowmeter has a fault.
2. The sensing method for a coriolis mass flowmeter of claim 1, characterized in that the mass flow through said measurement tube (300) is determined from vibration signals at the inlet end and the outlet end of the same measurement tube (300) when determining said at least two mass flow data.
3. The sensing method for a coriolis mass flowmeter of claim 2, wherein in determining said at least two mass flow rate data, two vibration sensing units are provided at each of said inlet and outlet ends of said measurement tube (300), and wherein said two mass flow rate data are determined from vibration signals at said inlet and outlet ends of the same measurement tube (300), and wherein said two mass flow rate data are averaged and then a difference is determined from an average of said mass flow rate data determined from vibration signals of other said measurement tubes (300).
4. The sensing method for a coriolis mass flowmeter of claim 1, characterized in that in determining said at least two mass flow data, the corresponding mass flow is determined based on a vibration signal at an inlet end of one of said measurement tubes (300) and a vibration signal at an outlet end of the other of said measurement tubes (300).
5. The sensing method for a coriolis mass flowmeter of claim 4, wherein in determining said at least two mass flow rate data, two vibration sensing units are provided at each of an inlet end and an outlet end of said measuring tube (300), two mass flow rate data are determined from a vibration signal at the inlet end of one of said measuring tubes (300) and a vibration signal at the outlet end of the other of said measuring tubes (300), and after averaging two of said mass flow rate data, a difference is determined from an average of the mass flow rate data determined from the remaining two mass flow rate data.
6. The sensing method for a coriolis mass flowmeter of claim 1, wherein the operation of acquiring vibration signals at the inlet end and the outlet end of said measurement tubes (300) is performed simultaneously when at least two of said measurement tubes (300) are operating simultaneously.
7. The sensing method for a coriolis mass flowmeter of claim 1 characterized in that said vibration signals at said inlet end and said outlet end are collected while said measurement tubes (300) are operating while at least two of said measurement tubes (300) are operating in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586813.8A CN114910142A (en) | 2022-05-26 | 2022-05-26 | Detection method for Coriolis mass flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586813.8A CN114910142A (en) | 2022-05-26 | 2022-05-26 | Detection method for Coriolis mass flowmeter |
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| CN114910142A true CN114910142A (en) | 2022-08-16 |
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| CN202210586813.8A Pending CN114910142A (en) | 2022-05-26 | 2022-05-26 | Detection method for Coriolis mass flowmeter |
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