CN103575343A - Capacitive electromagnetic flowmeter for reciprocating magnetic field scanning - Google Patents
Capacitive electromagnetic flowmeter for reciprocating magnetic field scanning Download PDFInfo
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Abstract
The invention provides a capacitive electromagnetic flowmeter for reciprocating magnetic field scanning. The capacitive electromagnetic flowmeter comprises a pipe body, a first group of coils, a second group of coils and a third group of coils, wherein the first group of coils consists of a first coil and a second coil, the second group of coils consists of a third coil and a fourth coil, the third group of coils consists of a fifth coil and a sixth coil, the first coil and the third coil are respectively and fixedly arranged on the outer wall of the upper end of the pipe body, the second coil and the fourth coil are respectively and fixedly arranged on the outer wall of the lower end of the pipe body, the fifth coil is arranged on the upper part of the pipe body, and is fixedly arranged on the first coil and the third coil, and the sixth coil is arranged on the lower part of the pipe body, and is fixedly arranged on the second coil and the fourth coil. The flowmeter is high in measuring precision, low in cost and safe and reliable in use.
Description
Technical field
The present invention relates to detect in real time flow, electrodeless capacitive electromagnetic flow meter.This electromagnetic flowmeter adopts reciprocating magnetic field scan mode, utilize Faraday's electromagnetic induction law, obtain changing with measuring media and lining specific inductive capacity, liner thickness, the irrelevant electrode potential signals of various factors such as liner thickness transformation temperature, the method for designing of the capacitive electromagnetic flow meter of the accurate flow measurement of carrying out.
Background technology
Electromagnetic flowmeter is the principle of work of utilizing Faraday's electromagnetic induction law, measures the instrument of conducting liquid volumetric flow rate.Conducting liquid is regarded as to conductor, the mobile conductor of regarding as of fluid is done cutting magnetic line movement.And then measure conductive fluid flow velocity, flow etc. with inductive electromagnetic method.
When conducting liquid along measuring tube when alternating magnetic field becomes movement in vertical direction with the magnetic line of force, conducting liquid cutting magnetic line 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=BVD ⑴
In formula: B ... magnetic induction density;
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 induction electromotive force E is directly proportional to detected fluid flow velocity V.By the instantaneous volume flow rate Q on measuring tube xsect and the pass between flow velocity V, be:
Q =
·V ⑵
(2) (1) substitution formula of formula is obtained:
Q =
·E = K·E ⑶
In formula: K ... meter constant
E is commonly referred to flow signal, and by flow signal input converter, the 4 ~ 20mA current signal, pulse (or frequency) signal that are directly proportional to flow of output after treatment, 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 potential electrode is attached on measuring channel lining, contact with measuring media, flow medium especially slurries friction electrode produces undesired signal, directly affect flow measurement precision, and the burn into of electrode pollutes, leakage is common fault during electromagnetic flowmeter is used.So the Electromagnetic Flow of studying non-contact type electrode is in respect of very large realistic meaning.For addressing these problems, the electrodeless capacitive electromagnetic flow meter of general employing, because the variation of the factors such as dielectric constant with temperature of liner thickness, lining medium directly affects flow measurement precision, domestic, external employing has the capacitive electromagnetic flow meter of ceramic lined, ceramic lined good rigidly is wear-resisting, and dielectric coefficient and temperature are floated little.But ceramic lined processing technology is complicated, expensive, is installed to very easily breakage on pipeline, and is not suitable for heavy caliber flowing meter.Therefore this flowmeter is not promoted widely.
As can be seen here: the factors vary convection current such as specific inductive capacity that solve well capacitive electromagnetic flow meter liner thickness, lining medium measure the impact of accuracy of measurement, being the key factor of capacitive electromagnetic flow meter application success or failure, is also the core technology in capacitive electromagnetic flow meter flow detection.
Summary of the invention
Object of the present invention, be the impact that the factor convection current such as the body thickness for current electrodeless capacitive electromagnetic flow meter, the specific inductive capacity of body medium measure accuracy of measurement, and a kind of electrodeless capacitive electromagnetic flow meter of a kind of reciprocating magnetic field scanning that can effectively address the above problem from theoretical and practical application angle is provided.
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 the 3rd group of coil, it is characterized in that:
First group of coil by the first coil and the second coil form, second group of coil be comprised of tertiary coil and the 4th coil; The 3rd group of coil is comprised 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 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 upper and lower symmetry in position of the second coil and the first coil, the upper and lower symmetry in position of the 4th coil and tertiary coil.
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 on the below of body, and is fixed on tertiary coil and the 4th coil.
The two ends lead-in wire E12 of the two ends lead-in wire A8 of first group of coil and the two ends lead-in wire D10 of B9, the second coil and C11 and the 3rd group of coil is connected respectively at the corresponding wiring terminal on terminal block with F13.
Principle of work:
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, the impact on flow signal measurement.
E = εKBV (1)
ε----liner thickness and specific inductive capacity influence coefficient
V----rate of flow of fluid
Adopt reciprocating magnetic field scan mode
When magnetic field moving direction is consistent with fluid flow direction
E1 =εKB (V + V
B ) （2）
When E1----fluid and magnetic field catatrepsis, the electric potential signal producing between 2 capacitor plates
V
b----magnetic field translational speed
When magnetic field moving direction is contrary with fluid flow direction
E2 =εKB (V - V
B ) （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 * 2 V
b(4)
εKB =ΔE / 2 V
B (5)
(5) in generation (1), obtains:
E =ΔE * V/ 2 V
B
We can pass through E1 Δ E, and E2 electric potential signal obtains, V
bmagnetic field translational speed is known, and then, can try to achieve induced potential is E (E is commonly referred to flow signal), because E is only relevant with V and irrelevant with ε, therefore the flow signal that this capacitive electromagnetic flow meter records, irrelevant with liner thickness and the isoparametric variation of dielectric coefficient, eliminated the impact that the factor convection current such as liner thickness and dielectric coefficient measure accuracy of measurement.
By back and forth applying continuously, respectively organize coil magnetization electric current, and then (translational speed is: V to obtain the magnetic field moving back and forth
b)
By E=Δ E * V/2 V
b, 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, and the factors such as dielectric coefficient of lining medium, convection current measures the impact of accuracy of measurement.Meanwhile, overcome again the shortcoming of the capacitive electromagnetic flow meter with ceramic lined.
2, by multiple batches of, repeat experiment showed, application electromagnetic flowmeter of the present invention, flow measurement precision is high, and stable performance in maximum flow, minimum flow and usual amounts measurement range is 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, the measurement of the suitable associated fluid of the present invention.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment:
A capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprises body 1, first group of coil, second group of coil and the 3rd group of coil, it is characterized in that:
First group of coil is comprised of the first coil 2 and the second coil 3; Second group of coil is comprised of tertiary coil 4 and the 4th coil 5; The 3rd group of coil is comprised 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 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 and the 4th coil 5 are separately 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 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 coil 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 E12 of the two ends lead-in wire A8 of first group of coil and the two ends lead-in wire D10 of B9, the second coil and C11 and the 3rd group of coil is connected with the corresponding wiring terminal on terminal block respectively with F13.
Claims (2)
1. a capacitive electromagnetic flow meter for reciprocating magnetic field scanning, comprises body (1), first group of coil, second group of coil and the 3rd group of coil, it is characterized in that:
First group of coil is comprised of the first coil (2) and the second coil (3); Second group of coil is comprised of tertiary coil (4) and the 4th coil (5); The 3rd group of coil is comprised 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) and the 4th coil (5) are separately 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 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 coil (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 E12 of the two ends lead-in wire A8 of first group of coil and the two ends lead-in wire D10 of B9, the second coil and C11 and the 3rd group of coil is connected with the corresponding wiring terminal on terminal block respectively with F13.
2. the capacitive electromagnetic flow meter that a kind of reciprocating magnetic field according to claim 1 scans, is characterized in that: measuring method is:
E =ΔE * V/ 2 V
B；
Δ E=E in formula
1– E
2=ε KB * 2 V
b;
E
1=εKB (V + V
B ) ；
E
2 =εKB (V - V
B ) ；
εKB =ΔE / 2 V
B ；
ε----liner thickness and specific inductive capacity influence coefficient;
V----rate of flow of fluid;
When E1----fluid and magnetic field catatrepsis, the electric potential signal producing between 2 capacitor plates;
V
b----magnetic field translational speed;
E2----fluid and magnetic field are reverse when mobile, the electric potential signal producing between 2 capacitor plates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
|---|---|
| CN103575343A true CN103575343A (en) | 2014-02-12 |
| CN103575343B CN103575343B (en) | 2016-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780818A (en) * | 2020-07-22 | 2020-10-16 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228311A (en) * | 1985-04-03 | 1986-10-11 | Hitachi Ltd | Detector of electromagnetic flowmeter |
| 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 |
-
2013
- 2013-09-02 CN CN201310390057.2A patent/CN103575343B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228311A (en) * | 1985-04-03 | 1986-10-11 | Hitachi Ltd | Detector of electromagnetic flowmeter |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780818A (en) * | 2020-07-22 | 2020-10-16 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
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