CA2843049A1 - A flowmeter having a magnet and detection electrode arrangement with constant capacitance between detection electrodes - Google Patents
A flowmeter having a magnet and detection electrode arrangement with constant capacitance between detection electrodes Download PDFInfo
- Publication number
- CA2843049A1 CA2843049A1 CA2843049A CA2843049A CA2843049A1 CA 2843049 A1 CA2843049 A1 CA 2843049A1 CA 2843049 A CA2843049 A CA 2843049A CA 2843049 A CA2843049 A CA 2843049A CA 2843049 A1 CA2843049 A1 CA 2843049A1
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- CA
- Canada
- Prior art keywords
- detection electrode
- flowmeter
- present disclosure
- electrode
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present disclosure relates to a flowmeter comprising: an upper magnet and a lower magnet arranged respectively at the upper side and the lower side of the outer wall of a measurement tube; a left detection electrode and a right detection electrode installed respectively at the left side and the right side of the outer wall of the measurement tube;
a signal processing circuit connected to the left detection electrode and the right detection electrode; a left screen electrode and a left screen ring arranged outside the left detection electrode, and a right screen electrode and a right screen ring arranged outside the right detection electrode. The flowmeter provided by embodiments of the present disclosure has low power consumption, small nonlinearity, strong interference resistance, and good applicability.
a signal processing circuit connected to the left detection electrode and the right detection electrode; a left screen electrode and a left screen ring arranged outside the left detection electrode, and a right screen electrode and a right screen ring arranged outside the right detection electrode. The flowmeter provided by embodiments of the present disclosure has low power consumption, small nonlinearity, strong interference resistance, and good applicability.
Description
FLOWMETER
TECHNICAL FIELD
The present disclosure relates to the field of measurement of fluid flow, and in particular, to a flowmeter for measuring fluid flow with high precision.
BACKGROUND
The measurement of fluid flow plays a very important role in the field of industrial process control. An electromagnetic flowmeter is a type of measurement equipment for measuring the flow in volume of a conductive liquid according to Faraday's law of electromagnetic induction, and is constituted of a sensor directly contacting the fluid to be measured and a converter. A magnetic field is applied to two sides of the measurement tube of the electromagnetic flowmeter, and the medium to be measured cuts the lines of magnetic force when flowing through the measurement tube to generate induced electromotive force at the detection electrodes at the outside wall of the measurement tube. The magnitude of the induced electromotive force is proportional to the average flow speed of the fluid. Thereby the flow of the fluid can be measured.
The electromagnetic flowmeter in the prior art adopts a manner of exciting coils to generate a magnetic field, which has a complicated structure and the assembly of which is difficult. In addition, the size of the device itself is large.
Therefore, an object of the present disclosure is to design an electromagnetic flowmeter which has a simple structure, low power consumption, and small nonlinearity and the assembly of which is easy.
=
SUMMARY OF THE DISCLOSURE
In view of the above, an object of the present disclosure is to provide an electromagnetic flowmeter with permanent magnets and capacitance, which has advantages of low power consumption, small nonlinearity, strong interference resistance, and good applicability.
In order achieve the above object, the present disclosure adopts the following solutions.
A first aspect of the present disclosure provides a flowmeter, comprising:
an upper magnet (1) and a lower magnet (2) arranged respectively at the upper side and the lower side of the outer wall of a measurement tube;
a left detection electrode (3) and a right detection electrode (4) installed respectively at the left side and the right side of the outer wall of the measurement tube, both the left detection electrode (3) and the right detection electrode (4) being connected to a signal processing circuit;
a left screen electrode (5) and a left screen ring (7) arranged outside the left detection electrode (3), and a right screen electrode (6) and a right screen ring (8) arranged outside the right detection electrode (4), wherein both the left detection electrode (3) and the right detection electrode (4) have an elliptical shape to form a constant capacitance.
According to a flowmeter with permanent magnets and capacitance in a preferable embodiment of the present disclosure, both the upper magnet (1) and the lower magnet
TECHNICAL FIELD
The present disclosure relates to the field of measurement of fluid flow, and in particular, to a flowmeter for measuring fluid flow with high precision.
BACKGROUND
The measurement of fluid flow plays a very important role in the field of industrial process control. An electromagnetic flowmeter is a type of measurement equipment for measuring the flow in volume of a conductive liquid according to Faraday's law of electromagnetic induction, and is constituted of a sensor directly contacting the fluid to be measured and a converter. A magnetic field is applied to two sides of the measurement tube of the electromagnetic flowmeter, and the medium to be measured cuts the lines of magnetic force when flowing through the measurement tube to generate induced electromotive force at the detection electrodes at the outside wall of the measurement tube. The magnitude of the induced electromotive force is proportional to the average flow speed of the fluid. Thereby the flow of the fluid can be measured.
The electromagnetic flowmeter in the prior art adopts a manner of exciting coils to generate a magnetic field, which has a complicated structure and the assembly of which is difficult. In addition, the size of the device itself is large.
Therefore, an object of the present disclosure is to design an electromagnetic flowmeter which has a simple structure, low power consumption, and small nonlinearity and the assembly of which is easy.
=
SUMMARY OF THE DISCLOSURE
In view of the above, an object of the present disclosure is to provide an electromagnetic flowmeter with permanent magnets and capacitance, which has advantages of low power consumption, small nonlinearity, strong interference resistance, and good applicability.
In order achieve the above object, the present disclosure adopts the following solutions.
A first aspect of the present disclosure provides a flowmeter, comprising:
an upper magnet (1) and a lower magnet (2) arranged respectively at the upper side and the lower side of the outer wall of a measurement tube;
a left detection electrode (3) and a right detection electrode (4) installed respectively at the left side and the right side of the outer wall of the measurement tube, both the left detection electrode (3) and the right detection electrode (4) being connected to a signal processing circuit;
a left screen electrode (5) and a left screen ring (7) arranged outside the left detection electrode (3), and a right screen electrode (6) and a right screen ring (8) arranged outside the right detection electrode (4), wherein both the left detection electrode (3) and the right detection electrode (4) have an elliptical shape to form a constant capacitance.
According to a flowmeter with permanent magnets and capacitance in a preferable embodiment of the present disclosure, both the upper magnet (1) and the lower magnet
(2) are permanent magnets to provide a constant magnetic field.
(1) The present disclosure adopts permanent magnets to provide a constant magnetic field; therefore, the exciting circuit is not needed, and the device has a simple structure and low power consumption and is suitable for a scenario of power supplying with two power lines.
(2) The present disclosure adopts detection electrodes with an elliptical shape to make the capacitance between the detection electrodes as constant as possible and thus to ensure the uniformity of the electric field which reduces the nonlinearity and the interference of granular noise and improves the interference resistance. The present disclosure can be widely applied to the flow measurement of various liquid-solid two-phase fluids such as slurry, paper pulp, etc.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural diagram of a flowmeter provided by an embodiment of the present disclosure;
Fig. 2 is a schematic diagram of the detection electrodes in a flowmeter provided by an embodiment of the present disclosure;
Fig. 3 is a front view of a flowmeter provided by an embodiment of the present disclosure; and Fig. 4 is a schematic diagram of electric field distribution in a flowmeter provided by an embodiment of the present disclosure.
DETAILED DESCRIPTION
The solutions of the present disclosure will be further described in detail in the following with reference to the drawings and embodiments.
In the following, the embodiments of the present disclosure will be further described in detail in connection with the drawings.
(1) The present disclosure adopts permanent magnets to provide a constant magnetic field; therefore, the exciting circuit is not needed, and the device has a simple structure and low power consumption and is suitable for a scenario of power supplying with two power lines.
(2) The present disclosure adopts detection electrodes with an elliptical shape to make the capacitance between the detection electrodes as constant as possible and thus to ensure the uniformity of the electric field which reduces the nonlinearity and the interference of granular noise and improves the interference resistance. The present disclosure can be widely applied to the flow measurement of various liquid-solid two-phase fluids such as slurry, paper pulp, etc.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural diagram of a flowmeter provided by an embodiment of the present disclosure;
Fig. 2 is a schematic diagram of the detection electrodes in a flowmeter provided by an embodiment of the present disclosure;
Fig. 3 is a front view of a flowmeter provided by an embodiment of the present disclosure; and Fig. 4 is a schematic diagram of electric field distribution in a flowmeter provided by an embodiment of the present disclosure.
DETAILED DESCRIPTION
The solutions of the present disclosure will be further described in detail in the following with reference to the drawings and embodiments.
In the following, the embodiments of the present disclosure will be further described in detail in connection with the drawings.
- 3 -As shown in Fig. 1, an embodiment of the present disclosure provides a flowmeter as shown in the figures. The flowmeter comprises: an upper magnet 1 and a lower magnet 2 arranged respectively at the upper side and the lower side of the outer wall of As shown in Fig. 2, both the left detection electrodes 3 and the right detection electrode pate capacitor, the capacitance C is proportional to the area of the electrode plates of the capacitor, and inversely proportional to the distance between the electrode plates.
As shown in Fig. 4, the two electrodes are symmetrical with respect to the center, and the distance at the upper part decreases gradually. Therefore, when designing the flows in the measurement tube, the fluid cuts the lines of magnetic force to generate induced electromotive force whose magnitude is proportional to the average flow speed of the fluid. The left detection electrode 3 and the right detection electrode
As shown in Fig. 4, the two electrodes are symmetrical with respect to the center, and the distance at the upper part decreases gradually. Therefore, when designing the flows in the measurement tube, the fluid cuts the lines of magnetic force to generate induced electromotive force whose magnitude is proportional to the average flow speed of the fluid. The left detection electrode 3 and the right detection electrode
4 installed at the outer wall of the measurement tube are perpendicular to the upper magnet 1 and the lower magnet 2. The left detection electrode 3 and the right detection electrode 4 form a capacitance with the fluid and the wall of the measurement tube as the medium.
It is possible to obtain a signal related to the average flow speed of the fluid by detecting the change of the capacitance between the left and right detection electrodes, and thus achieve the flow measurement of the fluid.
The above embodiments of the present disclosure can achieve the following advantages and benefits:
(1) The present disclosure adopts permanent magnets to provide a constant magnetic field; therefore, the exciting circuit is not needed, and the device has a simple structure and low power consumption and is suitable for a scenario of power supplying with two power lines.
(2) The present disclosure adopts detection electrodes with a shape of an ellipse to make the capacitance between the detection electrodes as constant as possible and thus to ensure the uniformity of the electric field which reduces the nonlinearity and the interference of granular noise and improves the interference resistance.
The present disclosure can be widely applied to the flow measurement of various liquid-solid two-phase fluids such as slurry, paper pulp, etc.
The above specific implementation provides a further detailed description of the object, the technical solutions and the technical benefits of the present disclosure.
It is understood that the above description is only specific embodiments of the present disclosure and is not intended to limit the protection scope of the present disclosure.
Any modification, equivalent replacement, enhancement or the like within the principle of the present disclosure should all be contained within the protection scope of the present disclosure.
It is possible to obtain a signal related to the average flow speed of the fluid by detecting the change of the capacitance between the left and right detection electrodes, and thus achieve the flow measurement of the fluid.
The above embodiments of the present disclosure can achieve the following advantages and benefits:
(1) The present disclosure adopts permanent magnets to provide a constant magnetic field; therefore, the exciting circuit is not needed, and the device has a simple structure and low power consumption and is suitable for a scenario of power supplying with two power lines.
(2) The present disclosure adopts detection electrodes with a shape of an ellipse to make the capacitance between the detection electrodes as constant as possible and thus to ensure the uniformity of the electric field which reduces the nonlinearity and the interference of granular noise and improves the interference resistance.
The present disclosure can be widely applied to the flow measurement of various liquid-solid two-phase fluids such as slurry, paper pulp, etc.
The above specific implementation provides a further detailed description of the object, the technical solutions and the technical benefits of the present disclosure.
It is understood that the above description is only specific embodiments of the present disclosure and is not intended to limit the protection scope of the present disclosure.
Any modification, equivalent replacement, enhancement or the like within the principle of the present disclosure should all be contained within the protection scope of the present disclosure.
- 5 -
Claims (2)
1. A flowmeter, characterized by comprising:
an upper magnet (1) and a lower magnet (2) arranged respectively at the upper side and the lower side of the outer wall of a measurement tube;
a left detection electrode (3) and a right detection electrode (4) installed respectively at the left side and the right side of the outer wall of the measurement tube, both the left detection electrode (3) and the right detection electrode (4) being connected to a signal processing circuit;
a left screen electrode (5) and a left screen ring (7) arranged outside the left detection electrode (3), and a right screen electrode (6) and a right screen ring (8) arranged outside the right detection electrode (4), wherein both the left detection electrode (3) and the right detection electrode (4) have an elliptical shape to form a constant capacitance.
an upper magnet (1) and a lower magnet (2) arranged respectively at the upper side and the lower side of the outer wall of a measurement tube;
a left detection electrode (3) and a right detection electrode (4) installed respectively at the left side and the right side of the outer wall of the measurement tube, both the left detection electrode (3) and the right detection electrode (4) being connected to a signal processing circuit;
a left screen electrode (5) and a left screen ring (7) arranged outside the left detection electrode (3), and a right screen electrode (6) and a right screen ring (8) arranged outside the right detection electrode (4), wherein both the left detection electrode (3) and the right detection electrode (4) have an elliptical shape to form a constant capacitance.
2. The flowmeter according to claim 1, characterized in that both the upper magnet (1) and the lower magnet (2) are permanent magnets to provide a constant magnetic field.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310056415.6 | 2013-02-22 | ||
| CN201310056415.6A CN103196503B (en) | 2013-02-22 | 2013-02-22 | Flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2843049A1 true CA2843049A1 (en) | 2014-08-22 |
Family
ID=48719203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2843049A Abandoned CA2843049A1 (en) | 2013-02-22 | 2014-02-17 | A flowmeter having a magnet and detection electrode arrangement with constant capacitance between detection electrodes |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103196503B (en) |
| CA (1) | CA2843049A1 (en) |
| WO (1) | WO2014127670A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196503B (en) * | 2013-02-22 | 2015-03-25 | 孙晓君 | Flow meter |
| CN111307230A (en) * | 2020-03-02 | 2020-06-19 | 西门子传感器与通讯有限公司 | Electromagnetic flowmeter |
| CN111982215A (en) * | 2020-08-31 | 2020-11-24 | 维沃移动通信有限公司 | Flow detection device and detection method |
| CN112229457B (en) * | 2020-11-19 | 2021-09-21 | 吉林大学 | Novel electromagnetic flowmeter and measuring method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4388834A (en) * | 1981-03-31 | 1983-06-21 | Fischer & Porter Company | Electromagnetic flowmeter having a monolithic conduit |
| JP3031096B2 (en) * | 1993-01-29 | 2000-04-10 | 横河電機株式会社 | Capacitive electromagnetic flowmeter |
| JP2000352530A (en) * | 1999-06-10 | 2000-12-19 | Aichi Tokei Denki Co Ltd | Electromagnetic flowmeter |
| CN1560569A (en) * | 2004-02-18 | 2005-01-05 | 沈阳市传感技术研究所 | Permanent-magnet small bore flowmeter |
| CN100453979C (en) * | 2007-11-20 | 2009-01-21 | 浙江大学 | Capacitor type electromagnetic flow meter |
| DE102008059067A1 (en) * | 2008-11-26 | 2010-06-02 | Krohne Ag | Magnetic-inductive flowmeter |
| CN103196503B (en) * | 2013-02-22 | 2015-03-25 | 孙晓君 | Flow meter |
-
2013
- 2013-02-22 CN CN201310056415.6A patent/CN103196503B/en active Active
- 2013-12-23 WO PCT/CN2013/090205 patent/WO2014127670A1/en active Application Filing
-
2014
- 2014-02-17 CA CA2843049A patent/CA2843049A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN103196503A (en) | 2013-07-10 |
| WO2014127670A1 (en) | 2014-08-28 |
| CN103196503B (en) | 2015-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20190219 |