CN102980617A - Anti-high-frequency electromagnetic interference device for electromagnetic flow meter - Google Patents
Anti-high-frequency electromagnetic interference device for electromagnetic flow meter Download PDFInfo
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- CN102980617A CN102980617A CN2012105611318A CN201210561131A CN102980617A CN 102980617 A CN102980617 A CN 102980617A CN 2012105611318 A CN2012105611318 A CN 2012105611318A CN 201210561131 A CN201210561131 A CN 201210561131A CN 102980617 A CN102980617 A CN 102980617A
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Abstract
The invention discloses an anti-high-frequency electromagnetic interference device for an electromagnetic flow meter. A lining duct is covered by an internal magnetic field; a housing is sealed outside the internal magnetic field; a layer of conductor is fixed on the surface of the housing to form a screening layer; two ends of the lining duct extend out of the internal magnetic field and the screening layer; one end of a cable is connected with the internal magnetic field, and the other end of the cable is connected with a converter; and another cable is connected with an electrode of the lining duct, and the other end of another cable is connected with the converter. The conductor is sprayed or electroplated onto the housing by using a spraying or electroplating process; or, the thin plate conductor of less than 0.5 mm is adopted to be embedded on the housing. The conductor of the screening layer is copper or aluminum or zinc. As the anti-high-frequency electromagnetic interference device basically envelops the internal magnetic field of the electromagnetic flow meter and consumes most of external high-frequency electromagnetic energy on the anti-high-frequency electromagnetic screening layer, the normal formation and the normal operation of the internal magnetic field of the electromagnetic flow meter are guaranteed to further guarantee the metering accuracy and the normal operation of the electromagnetic flow meter.
Description
Technical field
The present invention relates to the improvement of the anti-high-frequency electromagnetic wave interference device structure of a kind of electromagnetic flowmeter.
Background technology
At present, electromagnetic flowmeter has become a kind of flow instrument of consumption maximum, but at the scene in the use procedure, and its modal problem is exactly that outside electromagnetic field is to the interference problem of electromagnetic flowmeter internal magnetic field.And on-the-spot external electromagnetic field can be found everywhere.Mainly contain the interference of 50Hz power frequency electromagnetic field, and the interference of various frequency electromagnetic waves.Anti-50Hz power frequency electromagnetic field disturbs the radome that can adopt ferrimagnet to make; But when high frequency, because magnetic hysteresis loss and the eddy current loss of ferrimagnet are larger, thereby cause the decline of resonant circuit quality factor Q value, so anti-50Hz power frequency electromagnetic field disturbs and technology and the material of impact are inoperative to high-frequency signal.
Summary of the invention
Be subject to the electromagnetic interference of external high frequency and impact when working at the scene for existing electromagnetic flowmeter, the invention provides the anti-high-frequency electromagnetic wave interference device of a kind of electromagnetic flowmeter safe and reliable, simple in structure, that be easy to produce.
Electromagnetic flowmeter is prevented the high-frequency electromagnetic wave interference device, it is characterized in that, and internal magnetic field parcel lining conduit, the internal magnetic field external seal has shell, and it is screen layer that case surface is fixed with one deck conductor; Stretch out outside internal magnetic field and the screen layer at lining conduit two ends; Cable one end is connected with internal magnetic field, and the other end is connected with converter; Another root cable one end is connected with the lining catheter electrode, and the other end is connected with converter.
Screen layer can use spraying or electroplating technique method, and conductor is painted or electroplated on the shell; Perhaps, adopt the light sheet conductor less than 0.5mm, edge is attached on the shell.
The screen layer conductor can be copper or for aluminium or for zinc.
The applied principle of the present invention is that the skin effect when frequency electromagnetic waves is propagated in conducting medium is theoretical.Principle of work and the theoretical foundation of anti-high-frequency electromagnetic wave interference device: when frequency electromagnetic waves is propagated in conducting medium, the increase of the amplitude distance of its amount (E and H) and press index law and decay.From the viewpoint of energy, electromagnetic wave has energy loss when propagating in conducting medium, therefore, shows as reducing of an amount amplitude.The field amount of conductive surface is maximum, more gos deep into conductor inside, and an amount is less.This phenomenon is also referred to as skin effect.That is to say, when frequency electromagnetic waves is propagated in conducting medium, the energy consumption that it is main and decay are on the superficial layer of conducting medium, and, the electric conductivity of its conducting medium is better, then the energy of frequency electromagnetic waves consumes and decay just more at its superficial layer, and the thickness of this conducting medium superficial layer is just thinner.
The invention has the advantages that: adopted anti-frequency electromagnetic waves screen layer, thereby when electromagnetic flowmeter is used at the scene, the frequency electromagnetic waves of the various frequencies that exist at the scene, all absorbed by anti-frequency electromagnetic waves screen layer and attenuate, and then guaranteed the normal operation of the internal magnetic field of electromagnetic flowmeter, also just guaranteed normal operation and the degree of accuracy of electromagnetic flowmeter.Because of the present invention reasonable in design, process is easily implemented, the installation site is suitable, does not need fully original design of electromagnetic flowmeter is adjusted and revised, so be easy to implement.The present invention can be used to electromagnetic flowmeter and prevent frequency electromagnetic waves to interference and the impact of electromagnetic flowmeter under work condition state, guarantees normal operation and the degree of accuracy of electromagnetic flowmeter.
Description of drawings
Accompanying drawing 1 is structural representation of the present invention.
Accompanying drawing 2 is side views of Fig. 1.
1 shell, 3 internal magnetic fields, 4 lining conduits, 5 screen layers, 6 cables, 7 converters.
Embodiment
The invention will be further described by reference to the accompanying drawings.
Electromagnetic flowmeter is prevented the high-frequency electromagnetic wave interference device, internal magnetic field 3 parcel lining conduits 4, and the internal magnetic field external seal has shell 1, and it is screen layer 5 that case surface is fixed with one deck conductor; Stretch out outside internal magnetic field 3 and the screen layer 5 at lining conduit 4 two ends; Cable 6 one ends are connected with internal magnetic field, and the other end is connected with converter 7; Another root cable 6 one ends are connected with the lining catheter electrode, and the other end is connected with converter 7.
The employing copper of screen layer is conductor, uses the process of spraying, and conductive copper is sprayed on the shell;
Since anti-high-frequency electromagnetic wave interference device basically envelope the internal magnetic field of electromagnetic flowmeter, the electromagnetic energy overwhelming majority of external high frequency is consumed on anti-frequency electromagnetic waves screen layer.Thereby guarantee normal formation and the normal operation of the internal magnetic field of electromagnetic flowmeter, thereby and then normal formation and the normal operation of the internal magnetic field of the metering precision of assurance electromagnetic flowmeter and normal operation assurance electromagnetic flowmeter.
Claims (3)
1. the anti-high-frequency electromagnetic wave interference device of electromagnetic flowmeter is characterized in that, internal magnetic field parcel lining conduit, and the internal magnetic field external seal has shell, and it is screen layer that case surface is fixed with one deck conductor; Stretch out outside internal magnetic field and the screen layer at lining conduit two ends; Cable one end is connected with internal magnetic field, and the other end is connected with converter; Another root cable one end is connected with the lining catheter electrode, and the other end is connected with converter.
2. according to the anti-high-frequency electromagnetic wave interference device of electromagnetic flowmeter claimed in claim 1, it is characterized in that described screen layer can be painted or electroplated to conductor on the shell; Perhaps, adopt the light sheet conductor less than 0.5mm, edge is attached on the shell.
3. according to the anti-high-frequency electromagnetic wave interference device of claim 1 or 2 described electromagnetic flowmeters, it is characterized in that the conductor of described screen layer is copper or for aluminium or be zinc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105611318A CN102980617A (en) | 2012-12-21 | 2012-12-21 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105611318A CN102980617A (en) | 2012-12-21 | 2012-12-21 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102980617A true CN102980617A (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105611318A Pending CN102980617A (en) | 2012-12-21 | 2012-12-21 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
Country Status (1)
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| CN (1) | CN102980617A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432674A (en) * | 2020-10-14 | 2021-03-02 | 中国航空工业集团公司北京长城航空测控技术研究所 | Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148847A (en) * | 1997-11-14 | 1999-06-02 | Fuji Electric Co Ltd | Detector structure of electromagnetic flow meter |
| CN1560569A (en) * | 2004-02-18 | 2005-01-05 | 沈阳市传感技术研究所 | Permanent-magnet small bore flowmeter |
| US7117749B2 (en) * | 2003-06-30 | 2006-10-10 | Abb Limited | Electromagnetic flow meter for low conductivity fluids |
| CN101194147A (en) * | 2005-05-16 | 2008-06-04 | 恩德斯+豪斯流量技术股份有限公司 | Magnetoinductive flow meter and measuring tube for such a flow meter |
| CN201532217U (en) * | 2009-07-27 | 2010-07-21 | 宁波市科奥流量仪表有限公司 | Variable-frequency electromagnetic flow meter |
| CN201764996U (en) * | 2010-01-20 | 2011-03-16 | 江西铜业股份有限公司 | Electromagnetic flow meter capable of resisting high-intensity magnetic field |
| CN203011444U (en) * | 2012-12-21 | 2013-06-19 | 上海一诺仪表有限公司 | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter |
-
2012
- 2012-12-21 CN CN2012105611318A patent/CN102980617A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148847A (en) * | 1997-11-14 | 1999-06-02 | Fuji Electric Co Ltd | Detector structure of electromagnetic flow meter |
| US7117749B2 (en) * | 2003-06-30 | 2006-10-10 | Abb Limited | Electromagnetic flow meter for low conductivity fluids |
| CN1560569A (en) * | 2004-02-18 | 2005-01-05 | 沈阳市传感技术研究所 | Permanent-magnet small bore flowmeter |
| CN101194147A (en) * | 2005-05-16 | 2008-06-04 | 恩德斯+豪斯流量技术股份有限公司 | Magnetoinductive flow meter and measuring tube for such a flow meter |
| CN201532217U (en) * | 2009-07-27 | 2010-07-21 | 宁波市科奥流量仪表有限公司 | Variable-frequency electromagnetic flow meter |
| CN201764996U (en) * | 2010-01-20 | 2011-03-16 | 江西铜业股份有限公司 | Electromagnetic flow meter capable of resisting high-intensity magnetic field |
| CN203011444U (en) * | 2012-12-21 | 2013-06-19 | 上海一诺仪表有限公司 | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter |
Non-Patent Citations (1)
| Title |
|---|
| 赵忠仁，张秀珍: "《电工基础》", 30 April 1992, 中国广播电视出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432674A (en) * | 2020-10-14 | 2021-03-02 | 中国航空工业集团公司北京长城航空测控技术研究所 | Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130320 |
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| WD01 | Invention patent application deemed withdrawn after publication |