CN110715708A - Flowmeter calibrating device - Google Patents
Flowmeter calibrating device Download PDFInfo
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- CN110715708A CN110715708A CN201810757836.4A CN201810757836A CN110715708A CN 110715708 A CN110715708 A CN 110715708A CN 201810757836 A CN201810757836 A CN 201810757836A CN 110715708 A CN110715708 A CN 110715708A
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- pipeline
- calibration
- calibration electrode
- flowmeter
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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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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention provides a flowmeter calibrating device which comprises a pipeline, a calibrating electrode and a magnetic field, wherein the pipeline is vertical to the direction of the magnetic field. The wall of the pipeline is provided with an opening, and the calibration electrode is inserted into the pipeline through the opening on the wall of the pipeline; one part of the calibration electrode is in contact with the metal fluid in the pipeline, and the other part of the calibration electrode is exposed out of the pipeline. The calibration electrode is inserted into the conduit in a lateral direction. The flowmeter calibrating device can calibrate the electromagnetic flowmeter in real time in the working process of the electromagnetic flowmeter without disassembling the electromagnetic flowmeter, and can adjust the depth of a measuring point as required to accurately measure the flow of fluid at different positions.
Description
Technical Field
The invention relates to a flowmeter calibrating device.
Background
The following background is provided to aid the reader in understanding the present invention and is not admitted to be prior art.
Electromagnetic flowmeters are commonly used for the flow measurement of high temperature liquid metals in the industrial field. An electromagnetic flowmeter applies a magnetic field in a direction perpendicular to the axis of a fluid pipe by using the hall effect, and when a metal fluid flows in the pipe and cuts magnetic lines of force, an induced potential is generated in a direction perpendicular to both the flow direction and the magnetic lines of force, the induced potential being proportional to the flow rate of the metal fluid. And selecting a measuring point on the pipeline to measure the potential, and calculating to obtain the flow of the fluid in the pipeline after measuring the induced potential. However, due to long usage time or fluid corrosion, the electromagnetic flow meter may have a deviation in the measurement of the fluid parameter. Therefore, the common flowmeter calibrating device is used for calibrating the electromagnetic flowmeter in practical application so as to ensure that the electromagnetic flowmeter accurately measures the fluid flow.
When the existing flowmeter calibrating device is used for calibrating an electromagnetic flowmeter, the electromagnetic flowmeter is usually required to be firstly detached from a fluid pipeline, the flowmeter cannot be calibrated while flow measurement is carried out, and the process is complex and low in efficiency. In addition, because laminar flow and turbulent flow exist in the fluid flowing in the pipeline, the depths of the measuring points selected in the pipeline are different, and the measured flow data are also different, so that some electromagnetic flowmeters select a plurality of measuring points and measure the electric field distribution of the fluid at different depths in the pipeline, and the flowing condition of the fluid is more fully reflected. However, the conventional flow meter calibration device cannot calibrate such an electromagnetic flow meter for measuring the electric field distribution of a fluid because the depth of a measurement point cannot be adjusted as required.
Disclosure of Invention
Aiming at the problems in the technology, the invention provides a flowmeter calibrating device which can calibrate an electromagnetic flowmeter in real time in the working process of the electromagnetic flowmeter without disassembling the electromagnetic flowmeter, and can adjust the depth of a measuring point as required to accurately measure the flow of fluid at different positions.
The invention provides a flowmeter calibrating device which comprises a pipeline, a calibrating electrode and a magnetic field, wherein the pipeline is vertical to the direction of the magnetic field, and the vertical direction of the pipeline to the direction of the magnetic field means that the flowing direction of metal fluid in the pipeline is vertical to the direction of the magnetic field. The cross-section of the conduit is polygonal or circular. The axial direction of the pipe is taken as the longitudinal direction, and the direction perpendicular to the axial direction is taken as the transverse direction.
Calibration electrode
Preferably, the wall of the pipeline is provided with an opening, and the calibration electrode is inserted into the pipeline through the opening on the wall of the pipeline; one part of the calibration electrode is in contact with the metal fluid in the pipeline, and the other part of the calibration electrode is exposed out of the pipeline. And a part of the calibration electrode exposed out of the pipeline is connected with the measuring instrument. The calibration electrodes measure the potential of the metal fluid in the pipe and compare the measured potential with the potential measured by the flowmeter at the same location. If there is a discrepancy between the two data, the meter is calibrated.
Preferably, the calibration electrode is inserted into the conduit in a lateral direction. So that the calibration electrode can detect the potential of the metal fluid at different depths on the same cross section of the pipeline. By inserting the tube in a lateral direction is meant that the direction in which the calibration electrode is inserted into the tube intersects the axis of the tube; alternatively, the direction of insertion of the calibration electrode into the conduit is away from the axis of the conduit.
Preferably, the calibration electrode is in clearance fit with the opening in the pipe wall, and the depth of the calibration electrode inserted into the pipe is manually adjusted. Due to the high viscosity coefficient of the metal fluid, the metal fluid does not flow out of the gap between the calibration electrode and the opening of the pipe wall. By adjusting the depth of the calibration electrode inserted into the pipeline, the calibration electrode detects the potential of the metal fluid at different depths in the pipeline. The different depths refer to different depths corresponding to the positions of the openings on the pipe wall.
Preferably, the calibration electrode is externally covered by an insulating sleeve, and two ends of the calibration electrode are exposed from the insulating sleeve. One end part of the calibration electrode positioned in the pipeline is contacted with the fluid to be measured, and the height of the end part is the height of the fluid to be measured; the insulating sleeve separates the electrode from other fluid heights, so that the detection result is not influenced by other fluid heights. The other end of the calibration electrode is exposed out of the pipeline, so that the detection electrode can be electrically connected with the detection instrument.
Preferably, the calibration electrode has a hand-held portion on a portion exposed outside the pipe. The handheld part is used for providing a force application point for manual operation, and the depth of the calibration electrode inserted into the pipeline is convenient to adjust manually.
Preferably, the calibration electrode has a scale. The scale on the calibration electrode is used for indicating the depth of the detection electrode extending into the pipeline.
Superconducting magnetic pole
The magnetic field is generated by superconducting magnetic poles which are positioned on two sides of the pipeline, or the superconducting magnetic poles are semi-cylindrical, and the pipeline is positioned in a cylinder formed by two superconducting magnetic poles.
Preferably, the superconducting pole is surrounded by a dewar filled with a cooling medium. The Dewar filled with the cooling medium keeps the low-temperature state of the superconducting magnetic pole, and ensures that the superconducting magnetic pole stably generates a magnetic field. The cooling medium may be liquid nitrogen or liquid helium.
Preferably, the superconducting magnet is provided with a water jacket, and the water jacket is sleeved outside the Dewar. The water jacket is a closed cavity filled with water, plays a role in heat insulation, and avoids the influence on the normal work of the superconducting magnetic pole caused by the heat of the metal fluid in the pipeline being conducted to the superconducting magnetic pole. Preferably, the water jacket is located on the side of the superconducting pole facing the pipe, or the water jacket surrounds the entire superconducting pole.
Preferably, the superconducting magnet is sleeved with a magnetic shielding sleeve, the magnetic shielding sleeve is sleeved outside the Dewar, and the magnetic shielding sleeve is positioned on one side of the superconducting magnet, which faces away from the pipeline. The magnetic shielding sleeve enables the superconducting magnetic pole to be magnetically isolated from the external environment, and meanwhile, the superconducting magnetic pole is not influenced to establish a magnetic field in the pipeline.
The invention has the beneficial effects that: 1. the flowmeter can be calibrated in real time under the condition of not disassembling the flowmeter, and the method is simple to operate and high in efficiency.
2. Through adjusting the degree of depth that detects in the stick inserts the pipeline, can test the fluidic flow data of the different degree of depth in the pipeline, can realize the accurate calibration to the electromagnetic flowmeter who measures fluid electric field distribution.
Drawings
FIG. 1 is a schematic diagram of a flow meter calibration apparatus of one embodiment of the present invention.
Fig. 2 is a perspective view of a flow meter calibration device according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a superconducting magnet of a flow meter calibration apparatus according to an embodiment of the present invention.
Detailed Description
The present invention is not intended to be limited to the details of construction and the arrangements of components set forth in the following description, as these components and terms of construction may be modified without departing from the spirit and scope of the invention.
As shown in fig. 1, a flowmeter calibration device includes a pipe 1, a calibration electrode 2, and a magnetic field, where the pipe is perpendicular to the magnetic field, and the perpendicular to the magnetic field means that the flow direction of a metal fluid in the pipe is perpendicular to the magnetic field. The cross-section of the conduit is polygonal or circular. The axial direction of the pipe is taken as the longitudinal direction, and the direction perpendicular to the axial direction is taken as the transverse direction.
Calibration electrode
As shown in fig. 1, an opening 101 is provided on the wall of the conduit, and the calibration electrode 2 is inserted into the conduit 1 through the opening 101 on the wall of the conduit; one part of the calibration electrode 2 is in contact with the metal fluid in the pipeline, and the other part of the calibration electrode is exposed out of the pipeline 1. And a part of the calibration electrode exposed out of the pipeline is connected with the measuring instrument. The calibration electrodes measure the potential of the metal fluid in the pipe and compare the measured potential with the potential measured by the flowmeter at the same location. If there is a discrepancy between the two data, the meter is calibrated.
The calibration electrode 2 is inserted into the pipe in the transverse direction. So that the calibration electrode can detect the potential of the metal fluid at different depths on the same cross section of the pipeline.
The calibration electrode 2 is in clearance fit with the opening on the pipe wall, and the depth of the calibration electrode inserted into the pipeline 1 is manually adjusted. Due to the high viscosity coefficient of the metal fluid, the metal fluid does not flow out of the gap between the calibration electrode and the opening of the pipe wall. By adjusting the depth of the calibration electrode inserted into the pipeline, the calibration electrode detects the potential of the metal fluid at different depths in the pipeline. The different depths refer to different depths corresponding to the positions of the openings on the pipe wall.
The calibration electrode 2 is covered by an insulating sleeve 201, and two ends 202 of the calibration electrode are exposed from the insulating sleeve. One end part of the calibration electrode positioned in the pipeline is contacted with the fluid to be measured, and the height of the end part is the height of the fluid to be measured; the insulating sleeve separates the electrode from other fluid heights, so that the detection result is not influenced by other fluid heights. The other end of the calibration electrode is exposed out of the pipeline, so that the detection electrode can be electrically connected with the detection instrument.
The calibration electrode 2 has a hand grip 203 on the portion exposed outside the pipe 1. The handheld part is used for providing a force application point for manual operation, and the depth of the calibration electrode inserted into the pipeline is convenient to adjust manually.
The calibration electrode 2 is graduated. The scale on the calibration electrode is used for indicating the depth of the detection electrode extending into the pipeline.
Superconducting magnetic pole
The magnetic field is generated by the superconducting magnetic poles 3, the superconducting magnetic poles 3 are semi-cylindrical, and the pipeline 1 is positioned in a cylinder enclosed by the two superconducting magnetic poles 3. In some embodiments, superconducting poles are located on both sides of the pipe.
The superconducting magnet 3 is surrounded by a dewar 4 filled with a cooling medium. The Dewar filled with the cooling medium keeps the low-temperature state of the superconducting magnetic pole, and ensures that the superconducting magnetic pole stably generates a magnetic field. The cooling medium is liquid nitrogen. In some embodiments, the cooling medium is liquid helium.
The superconducting magnetic pole 3 is provided with a water jacket 5, and the water jacket 5 is sleeved outside the Dewar 4. The water jacket is a closed cavity filled with water, plays a role in heat insulation, and avoids the influence on the normal work of the superconducting magnetic pole caused by the heat of the metal fluid in the pipeline being conducted to the superconducting magnetic pole. The water jacket is positioned on one side of the superconducting magnetic pole facing the pipeline. In some embodiments, the water jacket surrounds the entire superconducting pole.
The superconducting magnetic pole 3 is sleeved with a magnetic shielding sleeve 6, the magnetic shielding sleeve 6 is sleeved outside the Dewar 4, and the magnetic shielding sleeve 6 is positioned on one side of the superconducting magnetic pole 3, which faces away from the pipeline 1. The magnetic shielding sleeve enables the superconducting magnetic pole to be magnetically isolated from the external environment, and meanwhile, the superconducting magnetic pole is not influenced to establish a magnetic field in the pipeline.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (8)
1. The utility model provides a flowmeter calibrating device, includes pipeline, calibration electrode and magnetic field, and the pipeline is perpendicular with the magnetic field direction, its characterized in that: the wall of the pipeline is provided with an opening, and the calibration electrode is inserted into the pipeline through the opening on the wall of the pipeline; one part of the calibration electrode is in contact with the metal fluid in the pipeline, and the other part of the calibration electrode is exposed out of the pipeline.
2. The flowmeter calibration device as set forth in claim 1 wherein: the calibration electrode is inserted into the conduit in a lateral direction.
3. The flowmeter calibration device as set forth in claim 1 wherein: the calibration electrode is in clearance fit with the opening on the pipe wall, and the depth of the calibration electrode inserted into the pipeline is manually adjusted.
4. The flowmeter calibration device as set forth in claim 1 wherein: the outside of the calibration electrode is covered with an insulating sleeve, and two ends of the calibration electrode are exposed out of the insulating sleeve.
5. The flowmeter calibration device as set forth in claim 1 wherein: the calibration electrode has a hand-held portion on a portion exposed outside the pipe.
6. The flowmeter calibration device as set forth in claim 1 wherein: the calibration electrode is provided with a scale.
7. The flowmeter calibration device as set forth in claim 1 wherein: the magnetic field is generated by a superconducting magnetic pole; the superconducting magnetic poles are positioned on two sides of the pipeline, or the superconducting magnetic poles are cylindrical, and the pipeline is positioned in a cylinder surrounded by the superconducting magnetic poles.
8. The flowmeter calibration device as set forth in claim 7 wherein: the superconducting magnetic pole is surrounded by a Dewar filled with a cooling medium; the water jacket is sleeved outside the Dewar and is positioned between the superconducting magnetic pole and the pipeline; the superconducting magnetic pole is sleeved with a magnetic shielding sleeve, the magnetic shielding sleeve is sleeved outside the Dewar, and the magnetic shielding sleeve is positioned on one side of the superconducting magnetic pole, which faces away from the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810757836.4A CN110715708A (en) | 2018-07-11 | 2018-07-11 | Flowmeter calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810757836.4A CN110715708A (en) | 2018-07-11 | 2018-07-11 | Flowmeter calibrating device |
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| Publication Number | Publication Date |
|---|---|
| CN110715708A true CN110715708A (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810757836.4A Pending CN110715708A (en) | 2018-07-11 | 2018-07-11 | Flowmeter calibrating device |
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Citations (9)
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|---|---|---|---|---|
| JPS56142413A (en) * | 1980-04-09 | 1981-11-06 | Toshiba Corp | Method for testing electromagnetic flow meter |
| CN1048594A (en) * | 1989-06-16 | 1991-01-16 | 株式会社日立制作所 | Electromagnetic flowmeter |
| US5503027A (en) * | 1989-09-26 | 1996-04-02 | The Foxboro Company | Electromagnetic flowmeters |
| CN1169528A (en) * | 1996-06-21 | 1998-01-07 | 上海大学 | Ionic-current calibration method for electromagnetic flowmeter |
| US6697742B1 (en) * | 1996-01-17 | 2004-02-24 | Abb Kent-Taylor Limited | Method and apparatus for testing electromagnetic flowmeters |
| CN101769770A (en) * | 2008-11-19 | 2010-07-07 | Abb技术股份公司 | The method that is used for the operations flows measuring device |
| CN204330035U (en) * | 2015-01-16 | 2015-05-13 | 燕山大学 | A kind of electromagnetism crosscorrelation measurement sensor |
| JP2016090524A (en) * | 2014-11-11 | 2016-05-23 | アズビル株式会社 | Calibration method and calibration system of electromagnetic flowmeter |
| CN107091672A (en) * | 2016-02-17 | 2017-08-25 | 施耐德电子系统美国股份有限公司 | Electromagnetic flowmeter calibration check |
-
2018
- 2018-07-11 CN CN201810757836.4A patent/CN110715708A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56142413A (en) * | 1980-04-09 | 1981-11-06 | Toshiba Corp | Method for testing electromagnetic flow meter |
| CN1048594A (en) * | 1989-06-16 | 1991-01-16 | 株式会社日立制作所 | Electromagnetic flowmeter |
| US5503027A (en) * | 1989-09-26 | 1996-04-02 | The Foxboro Company | Electromagnetic flowmeters |
| US6697742B1 (en) * | 1996-01-17 | 2004-02-24 | Abb Kent-Taylor Limited | Method and apparatus for testing electromagnetic flowmeters |
| CN1169528A (en) * | 1996-06-21 | 1998-01-07 | 上海大学 | Ionic-current calibration method for electromagnetic flowmeter |
| CN101769770A (en) * | 2008-11-19 | 2010-07-07 | Abb技术股份公司 | The method that is used for the operations flows measuring device |
| JP2016090524A (en) * | 2014-11-11 | 2016-05-23 | アズビル株式会社 | Calibration method and calibration system of electromagnetic flowmeter |
| CN204330035U (en) * | 2015-01-16 | 2015-05-13 | 燕山大学 | A kind of electromagnetism crosscorrelation measurement sensor |
| CN107091672A (en) * | 2016-02-17 | 2017-08-25 | 施耐德电子系统美国股份有限公司 | Electromagnetic flowmeter calibration check |
Non-Patent Citations (3)
| Title |
|---|
| 王池: "《流量测量技术全书 上册》", 30 June 2012, 化学工业出版社 * |
| 胡亮: "基于边界法向磁通密度逐点测量的无旋磁场重构方法及其应用", 《中国博士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 颜本慈: "《自动检测技术》", 31 October 1994, 国防工业出版社 * |
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