CN113267237B - Magneto-electric composite material detection device of magnetostrictive liquid level meter - Google Patents
Magneto-electric composite material detection device of magnetostrictive liquid level meter Download PDFInfo
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- CN113267237B CN113267237B CN202110387244.XA CN202110387244A CN113267237B CN 113267237 B CN113267237 B CN 113267237B CN 202110387244 A CN202110387244 A CN 202110387244A CN 113267237 B CN113267237 B CN 113267237B
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- 239000002131 composite material Substances 0.000 title claims abstract description 109
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 71
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/56—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
- G01F23/62—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using magnetically actuated indicating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention discloses a magneto-electric detection device of a magnetostrictive liquid level meter. Comprises two magnetoelectric composite materials and two permanent magnets; the permanent magnet provides a bias magnetic field for the magnetoelectric composite material, one end of the first magnetoelectric composite material and one end of the second magnetoelectric composite material are respectively fixed on a horizontal tangent line of the outer circumference of the waveguide wire, and the first magnetoelectric composite material and the second magnetoelectric composite material are symmetrical about a circle center; the first permanent magnet is arranged above the other end of the first magnetoelectric composite material in parallel, and the second permanent magnet is arranged below the other end of the second magnetoelectric composite material in parallel. The invention directly converts the vibration signal into the electric signal through the piezoelectric effect, has higher conversion efficiency, and can regulate and control the resonance frequency of the magnetoelectric composite material through the bias magnetic field to approach the torsional wave vibration frequency, thereby increasing the output voltage of the piezoelectric material, improving the detection capability of the detection device on weak echo signals after long-distance attenuation, and further increasing the effective range of the magnetostrictive liquid level meter.
Description
Technical Field
The invention relates to the field of liquid level meter detection, in particular to a magneto-electric composite material detection device of a magnetostrictive liquid level meter.
Background
The magnetostrictive liquid level meter is a non-contact sensor for measuring the absolute position of a floater by utilizing the magnetostrictive effect, and is widely applied to industrial fields with severe conditions, such as an oil storage tank, a sewage tank, a chemical reaction kettle and the like due to the advantages of high precision, long service life, reliability, stability and the like.
The magnetostrictive liquid level meter mainly comprises a floater, a waveguide wire, a detection coil and a signal processing unit. The float is positioned at the liquid-gas interface, and a permanent magnet is arranged in the float and is used for forming a static axial magnetic field inside the waveguide wire. When the device works normally, current pulses are firstly introduced into the waveguide wire, so that an instantaneous circumferential magnetic field is formed on the waveguide wire, and after the current pulses are overlapped with an axial magnetic field existing in the waveguide wire, a Wei Deman effect proves that torsional waves are formed in the waveguide wire near the floater and propagate to two ends at a certain speed. The torsional wave reaches the detection device after a period of time, so that the stress in the magnetostrictive strip is changed, the magnetic induction intensity inside the strip is changed along with the change of the stress according to Villari effect, and a voltage signal is generated through an induction coil of the strip. The signal is input into a signal processing unit, amplified and filtered, and shaped into square wave pulses according to a fixed threshold. And obtaining the propagation time of the torsional wave according to the start pulse and the stop pulse, and finally calculating the liquid level height according to the product of the propagation time and the wave speed of the torsional wave.
From the above principle, it is known that using Villari effect to detect guided wave signal will undergo two energy conversion processes, namely mechanical to magnetic energy conversion and magnetic to electrical energy conversion. For large-scale application occasions, such as large-scale oil storage tanks with the height of 20m, the torsional wave intensity is greatly attenuated after long-distance transmission, and at the moment, voltage signals generated in the induction coil after the two conversion processes are weak, so that the signal-to-noise ratio is low, and the subsequent signal processing and time measurement are not facilitated.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a magneto-electric detection device of a magnetostrictive liquid level meter, which aims to solve the problem that the effective range of the liquid level meter is limited due to insufficient detection capability of the current detection device on weak echo signals.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention comprises a first magnetoelectric composite material, a second magnetoelectric composite material, a first permanent magnet and a second permanent magnet;
The first magnetoelectric composite material and the second magnetoelectric composite material are horizontally arranged in parallel and are respectively and symmetrically arranged at two sides of the waveguide wire in a point-to-point mode by taking the center of the waveguide wire as the center of the circle, and one ends, close to the waveguide wire, of the first magnetoelectric composite material and the second magnetoelectric composite material are respectively and fixedly connected to two positions, which are symmetrical in the center of the circle, on the outer circumference of the waveguide wire; the connecting line between one end of the first magnetoelectric composite material contacted with the waveguide wire and one end of the second magnetoelectric composite material contacted with the waveguide wire is a vertical diameter which passes through the center of the waveguide wire and is along the gravity direction;
A first permanent magnet is arranged above the other end of the first magnetoelectric composite material which is not connected with the waveguide wire in parallel, a second permanent magnet is arranged below the other end of the second magnetoelectric composite material which is not connected with the waveguide wire in parallel, and the first magnetoelectric composite material and the second magnetoelectric composite material are electrically connected to an external signal processing unit; the other end of the first magnetoelectric composite material which is not connected with the waveguide wire and the other end of the second magnetoelectric composite material which is not connected with the waveguide wire are connected to an external signal processing unit according to a differential structure.
The first magnetoelectric composite material and the second magnetoelectric composite material are of two-phase laminated structures and comprise piezoelectric materials and magnetostrictive materials, the piezoelectric materials are connected with the magnetostrictive materials through epoxy resin, one end of the magnetostrictive material close to the waveguide wire is fixed on the outer circumference of the waveguide wire along the radial direction of the waveguide wire, and the piezoelectric materials are fixedly bonded on the other end of the magnetostrictive material far away from the waveguide wire through epoxy resin; the first permanent magnets are arranged in parallel right above the piezoelectric material of the first magnetoelectric composite material and are arranged at intervals; the second permanent magnets are arranged in parallel and at intervals right below the piezoelectric material of the second magnetoelectric composite material.
The piezoelectric materials in the first magnetoelectric composite material and the piezoelectric materials in the second magnetoelectric composite material are respectively adhered to the magnetostrictive material and keep the same polarization direction, and the output end of the piezoelectric material of the first magnetoelectric composite material and the output end of the piezoelectric material of the second magnetoelectric composite material are connected according to a differential structure and then output to an external signal processing unit for processing.
The magnetostriction coefficient and Young modulus of the magnetostriction materials of the first magnetoelectric composite material and the magnetostriction material of the second magnetoelectric composite material are the same, and the piezoelectric constant and the elastic constant of the piezoelectric materials of the first magnetoelectric composite material and the second magnetoelectric composite material are the same. So that the first magnetoelectric composite material and the second magnetoelectric composite material have the same characteristic parameters.
The output end of the piezoelectric material is arranged on the side surface of the piezoelectric material far away from one end of the waveguide wire.
The magnetic poles of the first permanent magnet and the second permanent magnet are parallel and opposite in direction. Specifically, the N-poles of the first permanent magnet and the second permanent magnet face the direction close to the waveguide wire or face the direction far away from the waveguide wire, and the S-poles of the first permanent magnet and the second permanent magnet face the direction far away from the waveguide wire or face the direction close to the waveguide wire.
The magnetostrictive material is fixedly connected with the waveguide wire through a spot welding process.
The invention adjusts the resonance frequency of the magnetoelectric composite material through the bias magnetic field provided by the permanent magnet, and places two pieces of piezoelectric materials in the same polarity to form a differential output mode, thereby effectively improving the detection capability of the detection device on weak echo signals and improving the signal-to-noise ratio of output voltage signals.
The invention has the beneficial effects that:
compared with the method that the induction coil converts the guided wave signal into the voltage signal, the advantages of the magnetoelectric composite material are applied:
(1) Through piezoelectric effect, directly convert vibration signal into the electrical signal, conversion efficiency is higher.
(2) The resonant frequency of the magnetoelectric composite material can be regulated and controlled by the bias magnetic field to be close to the torsional wave vibration frequency, so that the output voltage of the piezoelectric material is increased, the detection capability of the detection device for weak echo signals after long-distance attenuation is improved, and the effective range of the magnetostrictive liquid level meter can be increased.
Drawings
FIG. 1 is a schematic diagram of a magneto-electric detector;
FIG. 2 is a schematic diagram of a liquid level meter using a magneto-electric detection device;
FIG. 3 is a schematic diagram of the structure of a magneto-electric detection device connected to a signal processing unit;
fig. 4 is a structure of a magneto-electric composite material.
In the figure, 1-first magnetoelectric composite material, 2-first permanent magnet, 3-waveguide wire, 4-second permanent magnet, 5-damping element, 6-float, 7-current limiting resistor, 8-power supply, 9-pulse excitation unit, 10-wire, 11-piezoelectric material, 12-epoxy resin, 13-magnetostriction material and 14-first magnetoelectric composite material.
Detailed Description
In order to more clearly illustrate the objects, features and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description.
In the following description, numerous details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than within the scope of the description, and therefore the scope of the invention is not limited by the specific implementations disclosed below.
As shown in fig. 1, the invention comprises a first magnetoelectric composite material 1, a second magnetoelectric composite material 14, a first permanent magnet 2 and a second permanent magnet 4; the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are horizontally arranged in parallel and are respectively and symmetrically arranged at two sides of the waveguide wire 3 in a point-to-point manner by taking the center of the waveguide wire 3 as the center of the circle, and one ends, close to the waveguide wire 3, of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are respectively and fixedly connected to two positions, which are symmetrical in the center of the circle, on the outer circumference of the waveguide wire 3; the connecting line between one end of the first magnetoelectric composite material 1 contacted with the waveguide wire 3 and one end of the second magnetoelectric composite material 14 contacted with the waveguide wire 3 is a vertical diameter passing through the center of the waveguide wire 3 and along the gravity direction;
A first permanent magnet 2 is arranged above the other end of the first magnetoelectric composite material 1 which is not connected with the waveguide wire 3 in parallel, a second permanent magnet 4 is arranged below the other end of the second magnetoelectric composite material 14 which is not connected with the waveguide wire 3 in parallel, and the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are electrically connected to an external signal processing unit; the other end of the first magnetoelectric composite material 1 which is not connected with the waveguide wire 3 and the other end of the second magnetoelectric composite material 14 which is not connected with the waveguide wire 3 are connected to an external signal processing unit in a differential structure.
As shown in fig. 1 and fig. 4, the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are both in two-phase laminated structures, each of the two-phase laminated structures comprises a piezoelectric material 11 and a magnetostrictive material 13, the piezoelectric material 11 is connected with the magnetostrictive material 13 through epoxy resin 12, one end of the magnetostrictive material 13 close to the waveguide wire 3 is fixed on the outer circumference of the waveguide wire 3 along the radial direction of the waveguide wire 3, and the magnetostrictive material 13 and the waveguide wire 3 are fixedly connected through a spot welding process. The piezoelectric material 11 is fixedly bonded to the other end of the magnetostrictive material 13 away from the waveguide wire 3 through the epoxy resin 12; the first permanent magnets 2 are arranged in parallel right above the piezoelectric material 11 of the first magnetoelectric composite material 1 and are arranged at intervals; the second permanent magnets 4 are arranged in parallel just below the piezoelectric material 11 of the second magnetoelectric composite material 14 and are arranged at intervals.
As shown in fig. 1 and 2, the magnetic pole directions of the first permanent magnet 2 and the second permanent magnet 4 are parallel and the magnetic pole arrangements are opposite. Specifically, the N-poles of the first permanent magnet 2 and the second permanent magnet 4 face the direction close to the waveguide wire 3 or face the direction far away from the waveguide wire 3, and the S-poles of the first permanent magnet 2 and the second permanent magnet 4 face the direction far away from the waveguide wire 3 or face the direction close to the waveguide wire 3.
The magnetostriction coefficient and the Young modulus of the magnetostriction material 13 of the first magnetoelectric composite material 1 and the magnetostriction material 13 of the second magnetoelectric composite material 14 are the same, and the piezoelectric constant and the elastic constant of the piezoelectric material 11 of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are the same, so that the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 have the same characteristic parameters.
The polarization direction of the piezoelectric material 11 in the first magnetoelectric composite material 1 and the polarization direction of the piezoelectric material 11 in the second magnetoelectric composite material 14 and the magnetostrictive material 13 are the same; and, output ends of the piezoelectric material 11 of the first magnetoelectric composite material 1 and output ends of the piezoelectric material 11 of the second magnetoelectric composite material 14 are connected according to a differential structure and then output to an external signal processing unit for processing, and the output ends of the piezoelectric material 11 are arranged on the side surface of the piezoelectric material 11 far from one end of the waveguide wire 3.
The implementation working process of the invention comprises the following steps:
As shown in fig. 2, the first permanent magnet 2 and the second permanent magnet 4 respectively provide bias magnetic fields with certain magnitudes for the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14, and the resonance frequency of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 is adjusted to be the same as or similar to the particle vibration frequency caused by torsional waves, so that the voltage signals output by the piezoelectric materials 1 in the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 when the magnetostrictive material 13 vibrates are enhanced.
As shown in fig. 3, the waveguide wire 3, the current limiting resistor 7, the power supply 8, the pulse excitation unit 9 and the wire 10 together form a current loop, when measuring the liquid level, firstly, a square wave signal with a certain pulse width is generated by the pulse excitation unit 9, the square wave signal is loaded into the waveguide wire 3 through the wire 10 and forms a circumferential magnetic field near the surface of the square wave signal, when the circumferential magnetic field generated by the waveguide wire 3 is instantaneously overlapped with an axial magnetic field formed by a permanent magnet inside the floater 6 in the waveguide wire 3 according to Wei Deman effect, the surface of the waveguide wire 3 is subjected to torsional deformation, and thereby torsional waves are excited, the torsional waves propagate to two ends of the waveguide wire 3 at a certain speed, and when the torsional waves reach the first magneto-electric composite material 1 and the second magneto-electric composite material 14, the direction of the vibration displacement generated inside the magnetostrictive material 13 of the first magnetoelectric composite material 1 and the direction of the vibration displacement generated inside the magnetostrictive material 13 of the second magnetoelectric composite material 14 are opposite, as in fig. 1, the waveguide wire 3 generates clockwise torsional tangential displacement at a moment, at which moment the inside of the magnetostrictive material 13 of the first magnetoelectric composite material 1 generates rightward vibration displacement, and the inside of the magnetostrictive material 13 of the second magnetoelectric composite material 14 generates leftward vibration displacement, and acts on the respective piezoelectric materials 11 through the epoxy resin 12, and at this moment, two voltage signals with opposite output polarities are further amplified by the differential output structure due to the homopolar arrangement of the piezoelectric materials 11 in the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 under the respective vibration displacement. The signal is input to a signal processing unit, and after amplification, filtering and shaping, the propagation time of the torsional wave can be determined from the start pulse and the end pulse, so that the absolute position of the float 6 can be calculated according to the TOF method. For the torsional wave reaching the end of the waveguide wire 3, most of its energy is absorbed by the damping element 5, thereby reducing the disturbance of the detection signal by the end-face reflected wave.
Claims (3)
1. A magneto-electric detection device of a magnetostrictive liquid level meter is characterized in that: the permanent magnet comprises a first magnetoelectric composite material (1), a second magnetoelectric composite material (14), a first permanent magnet (2) and a second permanent magnet (4);
The first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are horizontally arranged in parallel and are respectively and symmetrically arranged on two sides of the waveguide wire (3) by taking the center of the waveguide wire (3) as the center of a circle, and one ends, close to the waveguide wire (3), of the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are respectively and fixedly connected to two positions, which are symmetrical by the center of the circle, on the outer circumference of the waveguide wire (3);
A first permanent magnet (2) is arranged above the other end of the first magnetoelectric composite material (1) in parallel, a second permanent magnet (4) is arranged below the other end of the second magnetoelectric composite material (14) in parallel, and the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are electrically connected to an external signal processing unit;
The first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are of two-phase laminated structures and comprise piezoelectric materials (11) and magnetostrictive materials (13), one end of the magnetostrictive materials (13) close to the waveguide wire (3) is radially fixed on the outer circumference of the waveguide wire (3) along the waveguide wire (3), and the piezoelectric materials (11) are fixedly bonded on the other end of the magnetostrictive materials (13) far away from the waveguide wire (3) through epoxy resin (12); the first permanent magnet (2) is arranged right above the piezoelectric material (11) of the first magnetoelectric composite material (1) in parallel; the second permanent magnet (4) is arranged in parallel under the piezoelectric material (11) of the second magnetoelectric composite material (14);
The piezoelectric material (11) of the first magnetoelectric composite material (1) and the piezoelectric material (11) of the second magnetoelectric composite material (14) are respectively adhered to the magnetostrictive material (13) and keep the same polarization direction, and the output end of the piezoelectric material (11) of the first magnetoelectric composite material (1) and the output end of the piezoelectric material (11) of the second magnetoelectric composite material (14) are connected according to a differential structure and then output to an external signal processing unit;
a floater (6) is arranged outside the waveguide wire (3);
the magnetostriction coefficient and the Young modulus of the magnetostriction material (13) of the first magnetoelectric composite material (1) and the magnetostriction material (14) are the same, and the piezoelectric constant and the elastic constant of the piezoelectric material (11) of the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are the same;
the magnetic pole directions of the first permanent magnet (2) and the second permanent magnet (4) are parallel and the magnetic poles are arranged oppositely.
2. The magneto-electric detection apparatus of a magnetostrictive liquid level meter according to claim 1, wherein: the output end of the piezoelectric material (11) is arranged on the side surface of the piezoelectric material (11) far away from one end of the waveguide wire (3).
3. The magneto-electric detection apparatus of a magnetostrictive liquid level meter according to claim 1, wherein: the magnetostrictive material (13) is fixedly connected with the waveguide wire (3) through a spot welding process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110387244.XA CN113267237B (en) | 2021-04-08 | 2021-04-08 | Magneto-electric composite material detection device of magnetostrictive liquid level meter |
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| CN202110387244.XA CN113267237B (en) | 2021-04-08 | 2021-04-08 | Magneto-electric composite material detection device of magnetostrictive liquid level meter |
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| CN109540266B (en) * | 2019-01-17 | 2023-11-07 | 北京锐达仪表有限公司 | Magnetostrictive liquid level meter and liquid level measurement method |
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