CN102950103B - Ceramic transducer and ceramic transduction type magnetostriction transmitter - Google Patents
Ceramic transducer and ceramic transduction type magnetostriction transmitter Download PDFInfo
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- CN102950103B CN102950103B CN201110241966.0A CN201110241966A CN102950103B CN 102950103 B CN102950103 B CN 102950103B CN 201110241966 A CN201110241966 A CN 201110241966A CN 102950103 B CN102950103 B CN 102950103B
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- magnetostriction
- ceramic transducer
- waveguide filament
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Abstract
The invention belongs to process industrial field, achieve a kind of ceramic transduction type magnetostriction transmitter for level gauging, and ceramic transducer.Include the technology such as the application of magnetostriction float in unique manufacture craft of waveguide filament in ceramic transducer, the research and development of ceramic transducer, magnetostriction transmitter, thus increase substantially the conversion efficiency of this transmitter, useful signal exports and certainty of measurement, ensures its application at special operation condition.The present invention proposes to adopt ceramic transducer to combine with magnetostriction transmitter, not only can be good at solving above-mentioned torsion tubular type float level meter Problems existing, reduce the manufacture difficulty of magnetostriction transmitter, also can realize increasing substantially of precision in the measurements simultaneously.
Description
Technical field
The invention belongs to process industrial field, achieve a kind of ceramic transduction type magnetostriction transmitter that can be applicable to various operating mode, and ceramic transducer.
Background technology
Traditional float level transducer is the level gauging instrument designed according to Archimedes' principle, can be used to measure liquid level, position, boundary and density, is responsible for upper and lower spacing alarm signal and exports, be exclusively used in the liquid level measured in pressure vessel.
A kind of magnetostriction liquidometer product of current MTS company, employing be torsional wave pickup technology scheme based on counter magnetostriction effect.As shown in Figure 1, its obvious deficiency is the details of its torsional wave converter:
1) number of parts is many, needs biased magnet steel A, magnetostrictive metals sheet H, magnetic test coil D three cooperating, and the necessary precision-fit in three position, integral manufacturing finished product is high;
2) complex process, magnetostrictive metals sheet welds difficulty comparatively greatly with waveguide filament L's, and the coiling of miniature coils is also very complicated, not easily accomplishes scale production and cannot ensure its uniformity;
3) overall in measuring process conversion links is many, and transmission efficiency is low, causes the sensitivity of picking up signal low.
A kind of piezoelectric energy-conversion formula magneto strictive sensor of current Shenzhen Wan Xun company, what adopt is Plane Piezoelectric Materials transduction type technical scheme, the detail view of its piezoelectric transducer as shown in Figure 2, its obvious deficiency is: waveguide filament L is longitudinally horizontal, therefore only could the carrying out of maximal accuracy detect on completely vertical plan-position, its measurement effect by gravity and aspect effect very big.
Visible, magnetostrictive liquid level transducer common at present all repeats following problem in process application: install complicated; Measurement effect by gravity and aspect effect large; Media density change causes output error; Torque tube seepage and process medium are bonded on torque tube or floating drum wall and cause output bias large.
This project proposes to adopt ceramic transducer to combine with magnetostriction transmitter, not only can be good at solving Problems existing in above-mentioned fluid level transmitter product, also can realize increasing substantially of precision in the measurements simultaneously.
Summary of the invention
Research purpose of the present invention, for developing a kind of magnetostriction transmitter being applicable to various operating mode, and ensure that this technology can realize high-acruracy survey, in use at utmost reduce measurement environment and measured medium parameter to the impact of measurement result, thus direct and true and reliable carry out level gauging.Realize mechanical syndeton between all critical components of this liquid level gauge simultaneously, make final products in use non-maintaining.
The technical problem that the present invention solves is, have developed a kind of ceramic transducer, and ensures the waveguide filament uniform in material that uses in this transducer, and during transducer work, 360 ° can both detect useful signal, and signal to noise ratio can reach more than 30:1; Transmitter measured value is made farthest not by Media density variable effect by adopting magnetostriction float; The output error that to cause because Media density change do not appear in this transmitter is realized, torque tube seepage and process medium bonding and the problem such as the output bias that causes is large by many mouthfuls of technology such as sealing outer mounting structures etc.; Increase substantially transmitter precision in the measurements simultaneously.
Compared with existing a few money magnetostriction liquidometer technology, the advantage of technical solution of the present invention is:
1. mechanical torsional wave is converted into the signal of telecommunication by piezo-electric effect, and significantly improves the conversion efficiency of the signal of telecommunication by the plural serial stage superposition of piezoelectric ceramic piece, thus promotes the output of useful signal.
2. the piezoelectric ceramic piece plural serial stage in ceramic transducer and unsymmetric structure are put, eliminate the clutter and other interfering signals that produce in the course of work to greatest extent, signal to noise ratio during work is brought up to more than 30: 1, thus significantly improves the reliability of measurement.
3. ceramic transducer adopts the piezoelectric ceramic piece of military project level to make, and integral type is encapsulated in high temperature resistant gold-plated copper sheathing, has good high temperature resistant and humidity resistance, can adapt to various working temperature.
4. magnetostriction transmitter overall structure significantly simplifies, and without moving-member, integral installation technique is simple, and installation requirement is low, and product stability is high, is applicable to various harsh operating mode.Model machine of the present invention can reach following performance: gauge outfit and electronic unit
| Measurement parameter | Liquid level, interface |
| Repeatability | ± 0.15mm or 0.005% full scale |
| Non-linear | ± 0.3mm or 0.01% full scale |
| Precision | ± 0.5mm or 0.03% full scale |
| Pressure limit | 16-30VDC |
| Environment temperature | -40-70℃ |
| Display | LCD |
| Output signal | Two-wire system, 4-20mA/HART communication |
| Loop resistance | Maximum 620 ohm (24DVC) |
| Power consumption | Maximum 0.7 watt |
| Damping | 0-30 second |
| Explosive-proof grade | ExiaIICT4；ExdllCT6 |
| Power protection | Band reverse polarity protection |
| Resolution ratio | Analog quantity: 0.01mA; Numeral: 0.01 unit |
| Fault-signal | 3.86mA or 20.96mA |
| Humidity | 0～100％ |
| Gauge head structure | Dual cavity |
| Enclosure material | Die casting aluminium or stainless steel |
| Shell process | Enamel polyester paint coating |
| Electrical apparatus interface | 1/2 " NPT (F) or M20x1.5 |
Sensor and feeler lever
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows:
Fig. 1 is the structural principle schematic diagram that existing liquid level gauge counter magnetostriction effect detects torsional wave;
Fig. 2 is the structural principle schematic diagram that existing liquid level gauge piezoelectric type detects torsional wave;
Fig. 3 is the ceramic transducer structural principle schematic diagram in the present invention's pottery transduction type magnetostriction transmitter;
Fig. 4 is the present invention's pottery transduction type magnetostriction structure of transmitter principle schematic;
Fig. 5 is the immersion line change schematic diagram of magnetostriction float in the present invention's pottery transduction type magnetostriction transmitter;
Fig. 6 is the present invention's pottery transduction type magnetostriction transmitter multi-level metal welding hard sealing structure schematic diagram.
Detailed description of the invention:
The object of the invention is to be reached by following embodiment:
The processing of waveguide filament in ceramic transducer: waveguide filament is one of critical component of magnetostriction transmitter, whether the material of waveguide filament is evenly the key factor determining transmitters sense precision.If can ensure that sound wave is at the uniform velocity propagated in waveguide wire, just can ensure the precision detected, as processing technology is not in place, waveguide filament interior element skewness, or have broken curved, all can affect accuracy of detection, this project ensures the uniform in material of waveguide filament by following waveguide filament processing technology, and this technique is divided into five steps:
Step 1, by the iron of 59.% and 40.5% ratio, nickel metal Homogeneous phase mixing;
Step 2, metal mixed liquid is poured into wire drawing, its diameter is 0.765mm;
Step 3, be that the waveguide wire tray of .765mm is contained on the line dish of diameter 0.5m by diameter;
Step 4, by dish dress waveguide filament carry out 47% quenching, hardening heat is 837 DEG C;
Step 5, waveguide filament to be cooled.
Finished product waveguide filament is arranged on the feeler lever centre position of ceramic transducer.
As shown in Figure 3, this ceramic transducer have employed 82 shoulder pad shape high-tension electricity effects potteries and 4 500 fan-shaped high-tension electricity effect pottery plural serial stages to the structural principle of ceramic transducer, is evenly placed in gold-plated copper sheathing that diameter is 12mm.The ceramic transducer of circular configuration can ensure that magnetostriction transmitter operationally comprehensively can detect useful signal at 360 °; The fan-shaped high-tension electricity effect potsherd of asymmetric many groups superposes mutually simultaneously, clutter and other interfering signals that magnetostriction transmitter operationally produces can be eliminated to greatest extent, thus make magnetostriction transmitter signal to noise ratio operationally reach more than 30: 1.
As shown in Figure 3, figure comprises the operation principle of ceramic transducer: the waveguide filament installed with whole ceramic transducer plane orthogonal, 12 asymmetric installations the gold-plated copper sheathing of the fan-shaped high-tension electricity effect potsherd of plural serial stage and diameter 12mm.During transmitter work, waveguide filament cutting magnetic field produces torsional wave W, after this torsional wave W signal is delivered to potsherd with waveguide filament, produces the signal of telecommunication.The voltage that inside ceramic transducer, (waveguide filament position) produces is positive pole, the voltage that outside ceramic transducer, (gold-plated copper sheathing position) produces is negative pole, the signal of telecommunication is amplified 6000 times by electrical effect and plural serial stage by potsherd, thus make transmitter demonstrate extremely small signal intensity, significantly improve the certainty of measurement of transmitter.
Pottery transduction type magnetostriction transmitter overall structure and schematic diagram are as shown in Figure 4.
The magnetostriction transmitter that the research of this project makes, owing to have employed magnetostriction float, the impact by fluid to be measured variable density in its course of work is minimum, and its principle is:
During the work of magnetostriction ball float: G=F
floating
F
floating=ρ Vg=ρ Shg
When variable density: F
floating 1ρ
1v
1g
1=ρ
1s
1h
1g
1
F
floating 2=ρ
2v
2g
2=ρ
2s
2h
2g
2
Due to F
floating 1=F
floating 2=G
Therefore: ρ
1v
1g
1=ρ
2v
2g
2,
ρ
1·S
1·h
1·g
1＝ρ
2·S
2·h
2·g
2
Due to float sectional area S
1=S
2, weight parameter g
1=g
2,
Therefore: ρ
1h
11=ρ
2h
2
Due to the magnetostriction float of the employing in this project, within its length H can shorten to 100mm, therefore, when measured fluid density is by ρ
1change to ρ
2time, because the submergence height maximum changing range of float certainly can not more than H, and this length H is far smaller than the range L of magnetostriction transmitter.
Such as: as shown in Figure 5, magnetic float length 70mm, range can reach 3000mm to the immersion line change schematic diagram of magnetostriction float.When density is 800, immersion line is at 40mm place, and when density becomes 900 (in real testing process, the variable density of liquid level does not reach this amplitude far away) immersion line according to ρ
1h
11=ρ
2h
2, change to 35.6mm place, difference is 4.4mm, and relative to the range of 3000mm, its error produced because of difference is only 4.4mm/3000mm=0.15%,
The ceramic transduction type magnetostriction transmitter measured value of visible project is minimum, almost negligible by Media density variable effect.
Fig. 6 is ceramic transduction type magnetostriction transmitter multi-level metal welding hard sealing structure schematic diagram of the present invention.The ceramic transduction type magnetostriction transmitter of this project research, structurally have employed multi-level metal welding hard sealing structure, namely between magnetostriction Transmitter electrical gauge outfit interface, installing card socket, procedural interface and feeler lever, the hard sealing of multi-level metal welding is all adopted, thus avoid causing measured value to be affected by Media density because there is leakage point, this magnetostriction transmitter is not occurred in measuring process, and Media density change causes output error; Torque tube seepage and process medium bond and cause the problems such as output bias is large, increase substantially float level meter precision in the measurements simultaneously.
Claims (3)
1. a ceramic transducer, comprises waveguide filament and feeler lever, and the processing technology of described waveguide filament is divided into five steps:
Step one is even by the iron of 59.5% and 40.5% ratio, nickel metal mixed;
Step 2, pours into wire drawing by metal mixed liquid, and waveguide filament diameter is 0.765mm;
Diameter is that the waveguide wire tray of 0.765mm is contained on the capstan winch of diameter 0.5m by step 3;
Step 4, the waveguide filament of dish dress is carried out the quenching of 47%, hardening heat is 837 DEG C;
Step 5, cools waveguide filament;
Finished product waveguide filament is arranged on the centre position of ceramic transducer feeler lever, it is characterized in that, described ceramic transducer adopts 8 20 ° fan-shaped high-tension electricity effect potteries and 4 50 ° fan-shaped high-tension electricity effect pottery plural serial stages, evenly be placed in gold-plated copper sheathing that diameter is 12mm, thus can useful signal be detected at 360 ° when ceramic transducer is worked, and signal to noise ratio reaches more than 30: 1.
2. a ceramic transduction type magnetostriction transmitter, comprise magnetostriction float and ceramic transducer according to claim 1, under the effect of pulsed magnetic field and torsional wave, carry out level sensing, it is characterized in that, described float length 70mm, the range of described flexible transmitter can reach 3000mm.
3. flexible transmitter according to claim 2, it is characterized in that: adopt multi-level metal welding hard sealing structure, namely all seal completely between described flexible Transmitter electrical gauge outfit interface, installing card socket, procedural interface and feeler lever, make this transmitter not occur the problem causing output bias large because of torque tube seepage and process medium bonding, improve transmitter precision in the measurements simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241966.0A CN102950103B (en) | 2011-08-23 | 2011-08-23 | Ceramic transducer and ceramic transduction type magnetostriction transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241966.0A CN102950103B (en) | 2011-08-23 | 2011-08-23 | Ceramic transducer and ceramic transduction type magnetostriction transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN102950103A CN102950103A (en) | 2013-03-06 |
| CN102950103B true CN102950103B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110241966.0A Active CN102950103B (en) | 2011-08-23 | 2011-08-23 | Ceramic transducer and ceramic transduction type magnetostriction transmitter |
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Citations (7)
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|---|---|---|---|---|
| US5124686A (en) * | 1990-12-31 | 1992-06-23 | Midland Manufacturing Corp. | Tank level alarm control system |
| US5473245A (en) * | 1993-11-04 | 1995-12-05 | K-Tek Corporation | Magnetostrictive linear displacement transmitter having improved piezoelectric sensor |
| CN2457578Y (en) * | 2001-01-11 | 2001-10-31 | 王旭东 | Magnetostriction multipurpose level, temperature and density meter |
| CN2758717Y (en) * | 2004-10-09 | 2006-02-15 | 辽阳柯奥仪表有限公司 | Torsion sensor and float liquid level transmitter of torsion sensor type |
| CN1772937A (en) * | 2005-11-16 | 2006-05-17 | 北京科技大学 | Super magnetostrictive material with super wide work temperature range |
| CN2793705Y (en) * | 2005-05-18 | 2006-07-05 | 徐伟 | Magnetic telescopic level meter |
| DE102009031807A1 (en) * | 2009-07-03 | 2011-01-05 | Fafnir Gmbh | Mounting device for filling level measuring device of system, is provided with pipe, which is aligned to installation of measuring device of filling level measuring device and has two ends |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090031799A1 (en) * | 2007-07-31 | 2009-02-05 | Magnetrol International, Inc. | Float diagnostics for level measurement |
-
2011
- 2011-08-23 CN CN201110241966.0A patent/CN102950103B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5124686A (en) * | 1990-12-31 | 1992-06-23 | Midland Manufacturing Corp. | Tank level alarm control system |
| US5473245A (en) * | 1993-11-04 | 1995-12-05 | K-Tek Corporation | Magnetostrictive linear displacement transmitter having improved piezoelectric sensor |
| CN2457578Y (en) * | 2001-01-11 | 2001-10-31 | 王旭东 | Magnetostriction multipurpose level, temperature and density meter |
| CN2758717Y (en) * | 2004-10-09 | 2006-02-15 | 辽阳柯奥仪表有限公司 | Torsion sensor and float liquid level transmitter of torsion sensor type |
| CN2793705Y (en) * | 2005-05-18 | 2006-07-05 | 徐伟 | Magnetic telescopic level meter |
| CN1772937A (en) * | 2005-11-16 | 2006-05-17 | 北京科技大学 | Super magnetostrictive material with super wide work temperature range |
| DE102009031807A1 (en) * | 2009-07-03 | 2011-01-05 | Fafnir Gmbh | Mounting device for filling level measuring device of system, is provided with pipe, which is aligned to installation of measuring device of filling level measuring device and has two ends |
Non-Patent Citations (2)
| Title |
|---|
| 热处理对Fe81Ga19合金组织结构与磁致伸缩性能的影响;马云庆;《材料导报》;20090731;5-7 * |
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