CN203011444U - High-frequency electromagnetic interference preventing device of electromagnetic flowmeter - Google Patents
High-frequency electromagnetic interference preventing device of electromagnetic flowmeter Download PDFInfo
- Publication number
- CN203011444U CN203011444U CN 201220713437 CN201220713437U CN203011444U CN 203011444 U CN203011444 U CN 203011444U CN 201220713437 CN201220713437 CN 201220713437 CN 201220713437 U CN201220713437 U CN 201220713437U CN 203011444 U CN203011444 U CN 203011444U
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- internal magnetic
- frequency electromagnetic
- shell
- electromagnetic flowmeter
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Abstract
Disclosed is a high-frequency electromagnetic interference preventing device of an electromagnetic flowmeter. A liner tube is surrounded by an internal magnetic field which is closed by a shell, and a conductor layer, namely a shielding layer, is fixed on the surface of the shell. Two ends of the liner tube extend out of the internal magnetic field and the shielding layer. One end of a cable is connected with the internal magnetic field while the other end of the cable is connected with a converter. The other cable is in electrode connection with the liner tube while the other end of the cable is connected with the converter. The shielding layer is formed by spraying or electroplating conductors onto the shell by a spraying or electroplating process, or setting 0.5 mm conductor sheets onto the shell. The conductors for forming the shielding layer are copper, aluminum or zinc. Since the internal magnetic field of the electromagnetic flowmeter is enveloped by the high-frequency electromagnetic interference preventing device basically, most of energy of external high-frequency electromagnetic wave is consumed on the high-frequency electromagnetic wave shielding layer, the internal magnetic field of the electromagnetic flowmeter is formed and normally functions, and metering precision and normal running of the electromagnetic flowmeter are guaranteed.
Description
Technical field
The utility model 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 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, therefore 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 utility model provides a kind of safe and reliable, simple in structure, anti-high-frequency electromagnetic wave interference device of electromagnetic flowmeter 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 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 shell; Perhaps, adopt the light sheet conductor less than 0.5mm, edge is attached on shell.
The screen layer conductor can be copper or for aluminium or for zinc.
The applied principle of the utility model 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, the energy of frequency electromagnetic waves consume on its superficial layer and decay just more, the thickness of this conducting medium superficial layer is just thinner.
The utility model has the advantage of: 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 and attenuate by anti-frequency electromagnetic waves screen layer, 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.Due to of the present utility model reasonable in design, process is easily implemented, and the installation site is suitable, does not need fully original design of electromagnetic flowmeter is adjusted and revised, therefore be easy to implement.The utility model 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 the utility model structural representation.
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 utility model 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 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 shell;
Due to anti-high-frequency electromagnetic wave interference device basically envelope the internal magnetic field of electromagnetic flowmeter, the electromagnetic energy of the external high frequency overwhelming majority 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 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 shell; Perhaps, adopt the light sheet conductor less than 0.5mm, edge is attached on shell.
3. according to the anti-high-frequency electromagnetic wave interference device of the described electromagnetic flowmeter of claim 1 or 2, 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 |
|---|---|---|---|
| CN 201220713437 CN203011444U (en) | 2012-12-21 | 2012-12-21 | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220713437 CN203011444U (en) | 2012-12-21 | 2012-12-21 | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203011444U true CN203011444U (en) | 2013-06-19 |
Family
ID=48603031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220713437 Expired - Fee Related CN203011444U (en) | 2012-12-21 | 2012-12-21 | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203011444U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980617A (en) * | 2012-12-21 | 2013-03-20 | 上海一诺仪表有限公司 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
| CN107677331A (en) * | 2017-11-23 | 2018-02-09 | 西安蓝天石化设备有限公司 | Compression high-voltage electromagnetic flowmeter inside and outside a kind of immersion |
-
2012
- 2012-12-21 CN CN 201220713437 patent/CN203011444U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980617A (en) * | 2012-12-21 | 2013-03-20 | 上海一诺仪表有限公司 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
| CN107677331A (en) * | 2017-11-23 | 2018-02-09 | 西安蓝天石化设备有限公司 | Compression high-voltage electromagnetic flowmeter inside and outside a kind of immersion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20201221 |