CN103575343B - A kind of capacitive electromagnetic flow meter of reciprocating magnetic field scanning - Google Patents
A kind of capacitive electromagnetic flow meter of reciprocating magnetic field scanning Download PDFInfo
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- CN103575343B CN103575343B CN201310390057.2A CN201310390057A CN103575343B CN 103575343 B CN103575343 B CN 103575343B CN 201310390057 A CN201310390057 A CN 201310390057A CN 103575343 B CN103575343 B CN 103575343B
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Abstract
A capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprises body, first group of coil, second group of coil and the 3rd group of coil, and first group of coil is made up of the first coil and the second coil; Second group of coil is made up of tertiary coil and the 4th coil; The 3rd group of coil is made up of the 5th coil and the 6th coil; The first coil, tertiary coil are separately fixed on the upper end outer wall of body; The second coil and the 4th coil are separately fixed on the lower end outer wall of body, and the 5th coil is arranged on the top of body, and are fixed on the first coil and tertiary coil; The 6th coil is arranged on the below of body, and is fixed on tertiary coil and the 4th coil. This flow measurement accuracy of measurement is high, cost is low, safe and reliable.
Description
Technical field
The present invention relates to detect in real time flow, electrodeless capacitive electromagnetic flow meter. This electromagnetic flowmeter adopts reciprocal magneticField scan mode, utilizes Faraday's electromagnetic induction law, obtains changing with measuring media and lining dielectric constant, liner thickness,The irrelevant electrode potential signals of various factors such as liner thickness transformation temperature, the condenser type electromagnetism of the accurate flow measurement of carrying outThe method for designing of flowmeter.
Background technology
Electromagnetic flowmeter is the operation principle of utilizing Faraday's electromagnetic induction law, measures conducting liquid volume flowInstrument. Conducting liquid is regarded as to conductor, the mobile conductor of regarding as of fluid does cutting magnetic line movement. And then use electromagnetic induction methodMeasure conductor fluid flow velocity, flow etc.
When conducting liquid along measuring tube in the time that alternating magnetic field becomes movement in vertical direction with the magnetic line of force, conducting liquid cutting magnetic forceLine produces induced potential. With measuring tube axis and the orthogonal tube wall of magnetic field magnetic line on a pair of detecting electrode has been installed,This induced potential is detected.
If induced potential is E, have:
E=BVD⑴
In formula: B ... magnetic induction intensity;
D ... interelectrode distance, equates with measuring tube internal diameter;
V ... the mean flow rate of measuring tube internal diameter detected fluid on cross section.
Formula (1) middle magnetic field B is invariable, and D is a constant, and induced electromotive force E is directly proportional to detected fluid flow velocity V. LogicalThe pass of crossing between instantaneous volume flow rate Q and the flow velocity V on measuring tube cross section is:
Q=·V⑵
(2) (1) substitution formula of formula is obtained:
Q=·E=K·E⑶
In formula: K ... instrument constant
E is commonly referred to flow signal, by flow signal input converter, after treatment output be directly proportional to flow 4 ~20mA current signal, pulse (or frequency) signal, can record flow, adjusting etc.
It is more than the common electric potential signal that has electrode electromagnetic flowmeter.
In the development of electromagnetic flowmeter, because measurement electrode is attached on measuring channel lining, contact with measuring media,Flow medium especially slurries friction electrode produces interfering signal, directly affects flow measurement precision, and the burn into of electrodePolluting, revealing is common fault during electromagnetic flowmeter uses. So the Electromagnetic Flow of studying non-contact type electrode is in respect of very largeRealistic meaning. For addressing these problems, generally adopt electrodeless capacitive electromagnetic flow meter, due to liner thickness, liningThe variation of the factors such as the dielectric constant with temperature of medium directly affects flow measurement precision, and domestic, external employing has ceramic linerIn capacitive electromagnetic flow meter, ceramic lined good rigidly is wear-resisting, dielectric coefficient and temperature are floated little. But ceramic lined processing technology is multipleAssorted, expensive, be installed to very easily breakage on pipeline, and be not suitable for heavy caliber flowing meter. Therefore this flowmeter does not obtainTo promoting widely.
As can be seen here: solve well the factors such as the dielectric constant of capacitive electromagnetic flow meter liner thickness, lining mediumChanging the impact that convection current measures accuracy of measurement, is the key factor of capacitive electromagnetic flow meter application success or failure, is also condenser type electromagnetismCore technology in flowmeter flow detection.
Summary of the invention
Object of the present invention is for the body thickness of current electrodeless capacitive electromagnetic flow meter, Jie of body mediumThe factor convection current such as electric constant measures the impact of accuracies of measurement, and provide a kind of can be effectively from theoretical and practical application angleThe electrodeless capacitive electromagnetic flow meter of a kind of reciprocating magnetic field scanning addressing the above problem.
For achieving the above object, the technical solution used in the present invention is:
A capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprises body, first group of coil, second group of coil and theThree groups of coils, is characterized in that:
First group of coil by the first coil and the second coil form, second group of coil be by tertiary coil and the 4th coil groupsBecome; The 3rd group of coil is made up of the 5th coil and the 6th coil.
The shape of the first coil, the second coil, tertiary coil and the 4th coil and the outer wall shape of body adapt, and theOne coil, tertiary coil are separately fixed on the upper end outer wall of body; The second coil and the 4th coil are separately fixed at bodyOn the outer wall of lower end, and the upper and lower symmetry in position of the second coil and the first coil, the position of the 4th coil and tertiary coil is upper and lowerSymmetrical.
The 5th coil is arranged on the top of body, and is fixed on the first coil and tertiary coil; The 6th coil is arranged onThe below of body, and be fixed on tertiary coil and the 4th coil.
The two ends lead-in wire D10 of the two ends lead-in wire A8 of first group of coil and B9, the second coil and C11 and the 3rd group of coilTwo ends lead-in wire E12 is connected respectively at the corresponding wiring terminal on terminal plate with F13.
Operation principle:
Electromagnetic flowmeter in the past, produces constant magnetic field, fixed position, and the present invention adopts shuttle-scanning magnetic field.
Consider electrodeless capacitive electromagnetic flow meter liner thickness and change in dielectric constant, to the shadow of flow signal measurementRing.
E=εKBV(1)
ε----liner thickness and dielectric constant influence coefficient
V----rate of flow of fluid
Adopt reciprocating magnetic field scan mode
In the time that magnetic field moving direction is consistent with fluid flow direction
E1=εKB(V+VB)（2）
When E1----fluid and magnetic field catatrepsis, the electric potential signal producing between 2 capacitor plates
VB----magnetic field translational speed
In the time that magnetic field moving direction is contrary with fluid flow direction
E2=εKB(V-VB)（3）
E2----fluid and magnetic field are reverse when mobile, the electric potential signal producing between 2 capacitor plates
: Δ E=E1 – E2=ε KB*2VB（4）
εKB=ΔE/2VB(5)
(5) in generation (1), obtains:
E=ΔE*V/2VB
We can pass through E1 Δ E, and E2 electric potential signal obtains, VBMagnetic field translational speed is known, and then, can try to achieve induced electricityGesture is E (E is commonly referred to flow signal), because E is only relevant with V and irrelevant with ε, therefore this capacitive electromagnetic flow meter is surveyedThe flow signal obtaining, irrelevant with liner thickness and the isoparametric variation of dielectric coefficient, eliminate liner thickness and dielectric coefficient etc.Factor convection current measures the impact of accuracy of measurement.
By back and forth applying continuously each group of coil magnetization electric current, so obtain move back and forth magnetic field (translational speed is:VB）
By E=Δ E*V/2VB, try to achieve flow signal E.
Feature of the present invention:
1, maximum feature of the present invention is, has well solved capacitive electromagnetic flow meter, liner thickness, lining mediumThe factor such as dielectric coefficient, convection current measures the impact of accuracy of measurement. Meanwhile, overcome again the condenser type electromagnetism with ceramic linedThe shortcoming of flowmeter.
2, repeat experiment showed, application electromagnetic flowmeter of the present invention by multiple batches of, flow measurement precision is high,Stable performance in large flow, minimum discharge and usual amounts measurement category, reliable.
, the present invention is simple in structure, with low cost, safe and reliable.
The present invention is reasonable in design, be skillfully constructed, materials are few, making is easy, easy to use, and practicality is very strong, and the present invention is suitableThe measurement of suitable associated fluid.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Detailed description of the invention:
A capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprise body 1, first group of coil, second group of coil andThe 3rd group of coil, is characterized in that:
First group of coil is made up of the first coil 2 and the second coil 3; Second group of coil is by tertiary coil 4 and the 4th coil 5Composition; The 3rd group of coil is made up of the 5th coil 6 and the 6th coil 7.
The first coil 2, the second coil 3, tertiary coil 4 and the shape of the 4th coil 5 and the outer wall shape of body 1 are suitable mutuallyShould, and the first coil 2, tertiary coil 4 are separately fixed on the upper end outer wall of body 1; The second coil 3 and the 4th coil 5 are respectivelyBe fixed on the lower end outer wall of body 1, and the upper and lower symmetry in position of the second coil 3 and the first coil 2, the 4th coil 5 and the 3rdThe upper and lower symmetry in position of coil 4.
The 5th coil 6 is arranged on the top of body 1, and is fixed on the first coil 2 and tertiary coil 4; The 6th coil 7 is establishedPut below body 1, and be fixed on tertiary coil 4 and the 4th coil 5.
The two ends lead-in wire D10 of the two ends lead-in wire A8 of first group of coil and B9, the second coil and C11 and the 3rd group of coilTwo ends lead-in wire E12 is connected with the corresponding wiring terminal on terminal plate respectively with F13.
Claims (2)
1. a capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprise body (1), first group of coil, second group of coil andThe 3rd group of coil, is characterized in that:
First group of coil is made up of the first coil (2) and the second coil (3); Second group of coil is by tertiary coil (4) and the 4th lineCircle (5) composition; The 3rd group of coil is made up of the 5th coil (6) and the 6th coil (7);
The shape of the first coil (2), the second coil (3), tertiary coil (4) and the 4th coil (5) and the outer wall shape of body (1)Adapt, and the first coil (2), tertiary coil (4) are separately fixed on the upper end outer wall of body (1); The second coil (3) andFour coils (5) are separately fixed on the lower end outer wall of body (1), and the second coil (3) is upper and lower with the position of the first coil (2)Symmetry, the upper and lower symmetry in position of the 4th coil (5) and tertiary coil (4);
The 5th coil (6) is arranged on the top of body (1), and is fixed on the first coil (2) and tertiary coil (4); The 6th lineCircle (7) is arranged on the below of body (1), and is fixed on tertiary coil (4) and the 4th coil (5);
The two ends lead-in wire D10 of the two ends lead-in wire A8 of first group of coil and B9, second group of coil and the two ends of C11 and the 3rd group of coilLead-in wire E12 is connected with the corresponding wiring terminal on terminal plate respectively with F13.
2. the capacitive electromagnetic flow meter of a kind of reciprocating magnetic field scanning according to claim 1, is characterized in that: measure publicFormula is:
E＝ΔE*V/2VB；
Δ E=E in formula1–E2＝εKB*2VB；
E1＝εKB(V+VB)；
E2＝εKB(V-VB)；
εKB＝ΔE/2VB；
ε----liner thickness and dielectric constant influence coefficient;
V----rate of flow of fluid;
E1---when-fluid and magnetic field catatrepsis, the electric potential signal producing between 2 capacitor plates;
VB----magnetic field translational speed;
E2----fluid and magnetic field are reverse when mobile, the electric potential signal producing between 2 capacitor plates;
B represents magnetic induction intensity;
K represents instrument constant.
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| CN201310390057.2A CN103575343B (en) | 2013-09-02 | 2013-09-02 | A kind of capacitive electromagnetic flow meter of reciprocating magnetic field scanning |
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| CN103575343B true CN103575343B (en) | 2016-05-18 |
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| CN111780818B (en) * | 2020-07-22 | 2021-05-28 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368834A (en) * | 2008-09-24 | 2009-02-18 | 上海大学 | Multi-electrode insertion type electromagnetic flowmeter sensor |
| CN101865712A (en) * | 2010-04-13 | 2010-10-20 | 上海罗托克自动化仪表有限公司 | Novel electromagnetic flowmeter |
| CN102221383A (en) * | 2011-03-04 | 2011-10-19 | 厦门海旭东方智能科技有限公司 | Differential magnetic induction flow meter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228311A (en) * | 1985-04-03 | 1986-10-11 | Hitachi Ltd | Detector of electromagnetic flowmeter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368834A (en) * | 2008-09-24 | 2009-02-18 | 上海大学 | Multi-electrode insertion type electromagnetic flowmeter sensor |
| CN101865712A (en) * | 2010-04-13 | 2010-10-20 | 上海罗托克自动化仪表有限公司 | Novel electromagnetic flowmeter |
| CN102221383A (en) * | 2011-03-04 | 2011-10-19 | 厦门海旭东方智能科技有限公司 | Differential magnetic induction flow meter |
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