CN103017840A - 50-Hz power-frequency electromagnetic interference preventing device of electromagnetic flow meter - Google Patents
50-Hz power-frequency electromagnetic interference preventing device of electromagnetic flow meter Download PDFInfo
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- CN103017840A CN103017840A CN2012105611553A CN201210561155A CN103017840A CN 103017840 A CN103017840 A CN 103017840A CN 2012105611553 A CN2012105611553 A CN 2012105611553A CN 201210561155 A CN201210561155 A CN 201210561155A CN 103017840 A CN103017840 A CN 103017840A
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- flow meter
- electromagnetic flowmeter
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Abstract
The invention provides a 50-Hz power-frequency electromagnetic interference preventing device of an electromagnetic flow meter, which is characterized by being formed by upper and lower shielding covers made of ferro magnetic substances, wherein a cable hole is formed at the center of the upper part of the upper shielding cover; a liner guide pipe hole is formed at a connection part of the two sides of the upper shielding cover and the lower shielding cover; and the upper shielding cover and the lower shielding cover are fixedly connected in a sealed manner. The invention relates to the improvement of an electromagnetic interference preventing device structure of the electromagnetic flow meter, which can be used for preventing the interference on the electromagnetic flow meter by an outer 50-Hz power-frequency electromagnetic field under a work condition state of the electromagnetic flow meter, and guaranteeing that the strength of the magnetic field of the electromagnetic flow meter is not interfered and can work normally.
Description
Technical field
The present invention relates to the improvement of electromagnetic flowmeter anti-electromagnetic interference device structure, can be used to electromagnetic flowmeter and under work condition state, prevent outside 50Hz power frequency electromagnetic field to the interference of electromagnetic flowmeter, and guarantee the not disturbed of the magnetic field intensity of electromagnetic flowmeter own and normal operation.
Background technology
At present, electromagnetic flowmeter has become a kind of flow instrument of consumption maximum, especially in, bigbore flow instrument.But in the use procedure, its modal problem is that the electromagnetic field of outside is to the interference problem of electromagnetic flowmeter internal magnetic field at the scene.And the interference of on-the-spot external electromagnetic field can be found everywhere, and wherein, mainly is the interference of 50Hz power frequency alternating electromagnetic field.For example, with being mounted in the motor of the solenoid valve on the pipeline, and the motor of the electromagnetic flowmeter main frame of serving for it, it is more powerful.The motor of these solenoid valves and main frame all is 220 volts or 380 volts, 50Hz alternating current, several kilowatts at least of its power.And the magnetic field of electromagnetic flowmeter, its exciting current is generally 0.25A, the field coil impedance is 60 ohm, field voltage is 24 volts of (peak value) square waves, and frequency is generally ten sixth power frequencies or 1/20th power frequency or 1/25th power frequency, and exciting power is about 5 watts, even electromagnetic flowmeter complete machine, its power also only is no more than 20 watts, far away can not with the motor of the solenoid valve that is installed in same pipeline upstream and downstream, or the power that the motor of nigh main frame is installed is compared.These motors will produce huge 50Hz power frequency alternating electromagnetic field when work, and on the internal magnetic field of the electromagnetic flowmeter that is added to, will affect and disturb the internal magnetic field of electromagnetic flowmeter, and then affect and disturb normal operation and the degree of accuracy of electromagnetic flowmeter.
Summary of the invention
For the shortcoming that prior art exists, the invention provides a kind of electromagnetic flowmeter safe and reliable, simple in structure, that be easy to produce and assemble and prevent 50Hz power frequency electromagnet countermeasure set.
Electromagnetic flowmeter is prevented 50Hz power frequency electromagnet countermeasure set, it is characterized in that, is comprised of the upper and lower radome of ferrimagnet; Upper radome central upper portion is provided with cable aperture; Upper radome and junction, lower radome both sides are provided with the lining guide hole; Upper radome and lower sealing shielding can are affixed.
When the present invention used, this electro-magnetic shielding cover was fixedly mounted between electromagnetic flowmeter internal magnetic field and the shell, and got close to as much as possible internal magnetic field, but can not contact with internal magnetic field, and the internal magnetic field of electromagnetic flowmeter is closed as far as possible.Radome leaves cable aperture, uses to wear cable; The lining guide hole that leaves is for the lining conduit that electromagnetic flowmeter is installed.
The principle that the anti-50Hz power frequency electromagnet of electro-magnetic shielding cover of the present invention disturbs is:
When magnetic induction line 1 entered ferrimagnet from air, departing from of 1 pair of normal of magnetic induction line was very large, therefore shrank consumingly.Accompanying drawing 1 is the magnetic shielding schematic diagram.Radome 2 is the radome that the very large ferrimagnet of a magnetic permeability is made among the figure, is placed in the external magnetic field.Because the magnetic permeability μ of radome 2 shells is than thousands of times greatly of air magnetic permeability mu 0; so near the space of most magnetic field lines in the wall of radome 2 and the adjacent wall passed through; and in the cavity in the radome 2; magnetic induction line is seldom; only have ten thousand/several; and be in the protected inner member 3 at radome 2 internal cavity centers; the magnetic induction line of experiencing just still less; compare with the magnetic electricity performance of protected inner member 3 itself; the impact of the magnetic induction line of external disturbance can be disregarded; therefore reach the purpose of magnetic shielding, prevented the interference of external magnetic field.
The invention has the advantages that, adopted the ferromagnetism radome, thereby when electromagnetic flowmeter is used at the scene, its on-the-spot all 50Hz power frequency magnetic induction line almost completely is on screen and covers cover and lower radome absorbs, its 50Hz power frequency electromagnet disturbs almost completely conductively-closed to fall, and only have ten thousand/several, even 100,000/several interference is come in, so little interference does not affect fully on normal operation and the degree of accuracy of electromagnetic flowmeter, thereby reaches the purpose that anti-50Hz power frequency electromagnet disturbs.And, reasonable in design by thereon radome and lower radome, the installation site is suitable, does not need fully original design of electromagnetic flowmeter is adjusted and revised, therefore be easy to implement.
Description of drawings
Accompanying drawing 1 is the shielding principle schematic diagram;
Accompanying drawing 3 is schematic diagram of upper radome 8 structural front view;
Accompanying drawing 4 is schematic diagram of upper radome 8 structure right views;
Accompanying drawing 5 is schematic diagram of lower radome 5 structural front view;
Accompanying drawing 6 is schematic diagram of lower radome 5 structure right views;
Accompanying drawing 7 is right view schematic diagram that radome is used to shield the internal magnetic field of electromagnetic flowmeter.
In the accompanying drawing: 1 magnetic induction line, 2 radomes, 3 protected inner members, shell outside 4 electromagnetic flowmeters; lower 5 radomes, 51 boss, 6 fastening bolt groups, the lining conduit of electromagnetism 7 flowmeters; radome on 8, the internal magnetic field of 9 electromagnetic flowmeters, 10 cables, the converter of 11 electromagnetic flowmeters.
Embodiment
The invention will be further described by reference to the accompanying drawings.
Electromagnetic flowmeter is prevented 50Hz power frequency electromagnet countermeasure set, is comprised of the upper and lower radome of ferrimagnet; Upper radome 8 and lower radome 5 thick 3mm.Described lower radome junction inwall is provided with a circle boss 51, and it is affixed that upper radome is embedded on the boss of lower radome sealing.
Described ferrimagnet or soft iron material or silicon steel material.
The barrel of ferrimagnet is thicker, and shield effectiveness just significantly.But excessive thickening can raise the cost, and adds large volume, makes its heaviness.Through repetition test, when ferrimagnet was soft iron, silicon steel, its thickness was 2mm-4mm, and its cost performance is best, and the embodiment of the invention is 3mm.
Be enclosed in the radome that upper radome 8 and lower radome 5 form the internal magnetic field 9 of electromagnetic flowmeter is approximate, lining conduit 7 stretches out outside the shell 4 of upper and lower radome and electromagnetic flowmeter; Like this, the magnetic induction line 1 that just outside 50Hz power frequency electromagnetic field is produced attracts in the ferrimagnet of upper radome 8 and lower radome 5, thereby guarantee normal formation and the normal operation of the internal magnetic field 9 of electromagnetic flowmeter, and then guarantee metering precision and the normal operation of electromagnetic flowmeter.
Claims (5)
1. the anti-50Hz power frequency electromagnet countermeasure set of electromagnetic flowmeter is characterized in that, is comprised of the upper and lower radome of ferrimagnet; Upper radome central upper portion is provided with cable aperture; Upper radome and junction, lower radome both sides are provided with the lining guide hole; Upper radome and lower sealing shielding can are affixed.
2. according to the anti-50Hz power frequency electromagnet countermeasure set of electromagnetic flowmeter claimed in claim 1, it is characterized in that, described lower radome junction inwall is provided with a circle boss, and upper radome is embedded on the boss of lower radome.
3. according to claim 1 or the anti-50Hz power frequency electromagnet countermeasure set of 2 described electromagnetic flowmeters, it is characterized in that, the junction of upper radome and lower radome is left distance by two bolted between two spiral shells.
4. according to claim 1 or the anti-50Hz power frequency electromagnet countermeasure set of 2 described electromagnetic flowmeters, it is characterized in that the thick 2～4mm of upper and lower radome.
5. according to the anti-50Hz power frequency electromagnet countermeasure set of electromagnetic flowmeter claimed in claim 4, it is characterized in that described ferrimagnet or soft iron material or silicon steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105611553A CN103017840A (en) | 2012-12-21 | 2012-12-21 | 50-Hz power-frequency electromagnetic interference preventing device of electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105611553A CN103017840A (en) | 2012-12-21 | 2012-12-21 | 50-Hz power-frequency electromagnetic interference preventing device of electromagnetic flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103017840A true CN103017840A (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105611553A Pending CN103017840A (en) | 2012-12-21 | 2012-12-21 | 50-Hz power-frequency electromagnetic interference preventing device of electromagnetic flow meter |
Country Status (1)
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| CN (1) | CN103017840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2145495Y (en) * | 1992-09-28 | 1993-11-03 | 云南省滇西电业局 | Shielding apparatus for anti-interference of electromagnetic field |
| US6752026B1 (en) * | 2002-02-09 | 2004-06-22 | Thomas Allen Hyde | Annular void 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 |
| CN201463947U (en) * | 2009-05-14 | 2010-05-12 | 开封仪表有限公司 | Non-lining type electromagnetic flow sensor |
| CN101938202A (en) * | 2009-07-03 | 2011-01-05 | 应德贵 | Rotary shielding device for tubular permanent magnet |
| CN203011445U (en) * | 2012-12-21 | 2013-06-19 | 上海一诺仪表有限公司 | 50 Hz power frequency electromagnetic interference preventing device for electromagnetic flowmeter |
-
2012
- 2012-12-21 CN CN2012105611553A patent/CN103017840A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2145495Y (en) * | 1992-09-28 | 1993-11-03 | 云南省滇西电业局 | Shielding apparatus for anti-interference of electromagnetic field |
| US6752026B1 (en) * | 2002-02-09 | 2004-06-22 | Thomas Allen Hyde | Annular void 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 |
| CN201463947U (en) * | 2009-05-14 | 2010-05-12 | 开封仪表有限公司 | Non-lining type electromagnetic flow sensor |
| CN101938202A (en) * | 2009-07-03 | 2011-01-05 | 应德贵 | Rotary shielding device for tubular permanent magnet |
| CN203011445U (en) * | 2012-12-21 | 2013-06-19 | 上海一诺仪表有限公司 | 50 Hz power frequency electromagnetic interference preventing device for electromagnetic flowmeter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
| CN106338628B (en) * | 2016-11-16 | 2019-03-01 | 中国电子科技集团公司第四十一研究所 | A kind of protective device of wide-band microwave access Hz noise |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130403 |