CN212030674U - Magnetostrictive guided wave liquid level meter for high-temperature liquid - Google Patents
Magnetostrictive guided wave liquid level meter for high-temperature liquid Download PDFInfo
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- CN212030674U CN212030674U CN202020332200.8U CN202020332200U CN212030674U CN 212030674 U CN212030674 U CN 212030674U CN 202020332200 U CN202020332200 U CN 202020332200U CN 212030674 U CN212030674 U CN 212030674U
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Abstract
The utility model discloses a magnetostrictive guided wave liquid level meter for high-temperature liquid, which comprises a ferromagnetic long rod and a magnetostrictive sensor; the magnetostrictive sensor comprises a sensor main body formed by clamping a permanent magnet between an upper yoke and a lower yoke, the sensor main body is of a hollow structure, and one end of a ferromagnetic long rod penetrates through the hollow structure to be detachably connected with the magnetostrictive sensor; the ferromagnetic long rod extends into the main body part of the sensor and is wound with a coil, and two ends of the coil are connected with alternating current; the ferromagnetism stock is the cavity pole, and the vertical direction of ferromagnetism stock inner wall evenly sets up a plurality of flanges. The utility model discloses the level gauge guarantees the stability of guided wave excitation and receipt at end face installation magnetostrictive transducer, secondly, carries out the temperature calibration test through a plurality of flange signals to setting up on the steel pole, realizes detecting the propagation velocity of guided wave in the steel pole under the different temperatures, and then realizes the test to the high temperature liquid level. The utility model discloses simple structure, the installation of being convenient for is dismantled, and measurement accuracy is higher.
Description
Technical Field
The utility model relates to a liquid level measurement device, concretely relates to magnetostriction guided wave level gauge for high temperature liquid.
Background
The magnetostrictive liquid level meter is widely applied to liquid temperature measurement. The magnetostrictive liquid level meter based on the waveguide wire is mainly used for exciting and receiving ultrasonic guided waves in a first-order torsional mode. The traditional magnetostrictive liquid level meter mainly adopts a waveguide wire with excellent magnetostrictive performance and an annular magnetic floater, wherein the magnetization direction of the magnetic floater is along the axial direction, and when a current signal is introduced into the waveguide wire, torsional mode guided waves can be generated at the position of the magnetic floater of the waveguide wire by excitation based on the magnetostrictive effect. The generated torsional guided wave is transmitted to a guided wave receiving device on the end surface along the waveguide wire, and the calculation of the liquid level is completed by algorithm programming. When traditional magnetostrictive level meter carried out high temperature liquid level detection, unable accurate test liquid level had two reasons: firstly, the magnetic floater can generate demagnetization under the high-temperature condition, and effective bias magnetism can not be generated on the waveguide wire, so that the excitation of torsional mode guided waves is realized; secondly, under the high temperature condition, the propagation speed of the guided wave in the waveguide wire changes, and the liquid level calculation is deviated due to the result obtained by the conventional algorithm.
In view of this, it is desirable to provide a magnetostrictive guided wave level gauge for high temperature liquid, which is suitable for measuring the liquid level of high temperature liquid, has higher measurement accuracy, and is convenient to use.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a technical scheme who adopts provides a magnetostrictive guided wave level gauge for high temperature liquid, include:
the device comprises a ferromagnetic long rod, a magnetostrictive sensor and a control circuit board;
the magnetostrictive sensor comprises a sensor main body formed by clamping a permanent magnet between an upper yoke and a lower yoke, the sensor main body is of a hollow structure, and one end of a ferromagnetic long rod penetrates through the hollow structure to be detachably connected with the magnetostrictive sensor; the ferromagnetic long rod extends into the sensor main body part and is wound with a coil, and two ends of the coil are connected with alternating current;
the ferromagnetic long rod is a hollow rod, and a plurality of flanges are uniformly arranged on the inner wall of the ferromagnetic long rod in the vertical direction;
after the coil is electrified, a dynamic alternating magnetic field and a bias magnetic field which are equidirectional along the axial direction of the ferromagnetic long rod are generated, so that longitudinal mode guided waves are generated, reflected waves are generated when the longitudinal mode guided waves meet flanges in the process of propagation, meanwhile, the magnetostrictive transducer receives the reflected waves and determines the time for receiving the reflected waves, and the speed of the guided waves at each section of the ferromagnetic long rod is calculated according to the speed of the excited longitudinal mode guided waves; obtaining a relation curve of temperature and the propagation speed of longitudinal mode guided waves in the ferromagnetic long rod through a calibration test; thereby determining the liquid level position according to the upper and lower temperature difference of the liquid level;
the control circuit board comprises a power supply circuit, a single chip circuit, a liquid crystal display circuit, a power-on excitation circuit, an ADC acquisition circuit, a signal output circuit and a communication module. The control circuit board is electrically connected with the coil and controls the electrifying exciting circuit and the ADC acquisition circuit.
In the scheme, a plurality of salient points are uniformly arranged on the inner wall of the ferromagnetic long rod in the vertical direction to form the flange.
In the above solution, the ferromagnetic long rod body forms the flange by a groove formed from the outside to the inside.
In the scheme, the ferromagnetic long rod is sleeved with a hook.
In the above scheme, the long ferromagnetic rod is a cylindrical ferromagnetic rod with uniform wall thickness.
The utility model discloses the level gauge guarantees the stability of guided wave excitation and receipt at end face installation magnetostrictive transducer, through a plurality of flange signals that set up on detecting the steel pole, carries out the temperature calibration test through a plurality of flange signals to setting up on the steel pole, realizes detecting the propagation velocity of guided wave in the steel pole under the different temperatures, and then realizes the test to the high temperature liquid level. The utility model discloses simple structure, the installation of being convenient for is dismantled, and compares in current magnetostrictive liquid level meter based on waveguide silk, the utility model discloses measurement accuracy is higher.
Drawings
Fig. 1 is a schematic structural diagram provided by the present invention;
FIG. 2 is a schematic diagram of the operation of a magnetostrictive sensor;
fig. 3 is a schematic structural diagram of a preferred embodiment provided in the present invention;
fig. 4 is a schematic structural diagram of another preferred embodiment provided in the present invention;
FIG. 5 is a schematic view of a liquid level detection system provided in the present invention;
fig. 6 is the utility model provides a time domain signal chart is gathered to the level gauge.
Detailed Description
The utility model provides a magnetostrictive liquid level meter suitable for high temperature liquid level detection, at end face installation magnetostrictive sensor, guarantee the stability of guided wave excitation and receipt, secondly, carry out the temperature calibration test through a plurality of flange signals to setting up on the steel pole, realize detecting the propagation velocity of guided wave in the steel pole under the different temperatures, and then realize the test to the high temperature liquid level. The utility model discloses simple structure, the installation of being convenient for is dismantled, and compares in current magnetostrictive level gauge based on waveguide silk, the utility model discloses measurement accuracy is higher, just the utility model discloses the level gauge can directly detect high temperature liquid, also can install the level gauge and carry out the long-term monitoring of high temperature liquid level at fixed position.
It should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like refer to the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The invention is described in detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1-2, the utility model provides a magnetostrictive guided wave level gauge for high-temperature liquid, include:
a ferromagnetic long rod 1 extending into the liquid to be measured, and a magnetostrictive sensor 2 detachably connected with the ferromagnetic long rod 1; a control circuit board 4 connected with an external power supply or a central control device;
the magnetostrictive sensor 2 comprises a sensor main body formed by an upper yoke 21 and a lower yoke 22 which sandwich a permanent magnet 23, the sensor main body is of a hollow structure, and one end of a ferromagnetic long rod 1 penetrates through the hollow structure to be detachably connected with the magnetostrictive sensor 2; the ferromagnetic long rod 1 extends into the sensor main body part and is wound with a coil 3, and two ends of the coil 3 are connected with alternating current.
The magnetostrictive sensor is composed of a yoke, a permanent magnet and a coil. The permanent magnet is connected with and installed at the end of the ferromagnetic long rod through the yoke, and the coil 3 wound on the ferromagnetic long rod is introduced with the meter exchanging current signal to generate a dynamic meter exchanging magnetic field along the axial direction of the ferromagnetic long rod.
The control circuit board 4 comprises a power supply circuit, a single chip circuit, a liquid crystal display circuit, a power-on excitation circuit, an ADC acquisition circuit, a signal output circuit and a communication module. The control circuit board 4 is electrically connected with the coil 3, controls the power-on excitation circuit and the ADC acquisition circuit, displays liquid level information obtained by processing of the singlechip circuit in real time through the liquid crystal display circuit, simultaneously outputs the liquid level information through the signal output circuit and the communication module, and the signal output can adopt various modes such as wired 4-20ma, Hart protocol or wireless communication. The power supply circuit can adopt wired external power supply or lithium battery power supply.
The long ferromagnetic rod 1 is a hollow rod, and a plurality of flanges 11 are uniformly arranged in the vertical direction of the inner wall of the long ferromagnetic rod 1.
FIG. 2 is a schematic diagram showing the operation of the magnetostrictive sensor, in which the permanent magnet 23 forms a static magnetic field loop with the long ferromagnetic rod 1 through the upper and lower yokes, and a magnetic field B is generated in the long ferromagnetic rod 1 in the axial directionDCThe singlechip controls the energizing excitation circuit to lead the coil 3 wound in the ferromagnetic long rod 1 to be connected with an alternating current signal to generate a dynamic bias magnetic field B along the axial directionACThe two magnetic fields are in the same direction, and the longitudinal mode guided wave can be generated in the ferromagnetic long rod 1 by Joule effect. The longitudinal mode guided wave propagates in the axial direction in the ferromagnetic long rod 1, when the longitudinal mode guided wave passes through the flange, one part of energy is transmitted, the other part of energy is reflected to form a reflected guided wave, and the reflected guided wave returns to the coil 3 position and is reversely guidedThe joule effect is known that a voltage signal is acquired in the coil 3. The voltage signal is collected by the ADC collecting circuit and is subjected to analog-digital conversion, the digital signal is transmitted to the singlechip through the singlechip circuit to be processed, the peak signal is extracted through the singlechip, the propagation speed between points is calculated through the time difference of the peak signal, the temperature change can be obtained according to the speed change, so that the temperature difference change above and below the liquid level is detected, the obtained liquid level position information is displayed in real time through the liquid crystal display circuit and is transmitted to the signal output circuit and the communication module to output the liquid level information.
As shown in fig. 3, in the present embodiment, a plurality of bump forming flanges 11 are preferably uniformly arranged on the inner wall of the long ferromagnetic rod 1 in the vertical direction.
The cover is equipped with and to adjust and hang the couple 12 that sets up the uncovered edge of liquid device from top to bottom along ferromagnetism stock 1 on the ferromagnetism stock 1, according to the position of liquid level altitude mixture control couple 12 for ferromagnetism stock 1, couple 12 guarantees that the level gauge is stably placed in liquid.
As shown in fig. 4, the present embodiment is preferable that the body of the long ferromagnetic rod 1 is formed with a flange 11 by a groove formed from the outside to the inside.
Preferably, in this embodiment, in order to ensure that the propagation speed of the longitudinal mode guided waves and the reflected waves in the long ferromagnetic rod 1 is uniform and is not affected by the shape of the long ferromagnetic rod 1, the long ferromagnetic rod 1 is cylindrical and has a uniform wall thickness.
The operation of the present embodiment will be described in detail below.
As shown in fig. 5 and 6, the collected groove defects 11 reflect signals, and the packet signal corresponding to each section of groove defect 11 corresponds to a time, e.g., t1, t2, t3, and t4, so that the time for which the adjacent groove defect 11 reflects signals is Δ t2, the distances between the adjacent groove defects 11 are l2, l3, and l4, and the velocity of the guided wave in the adjacent two groove defects 11 can be calculated.
Before the device is put into use, a large number of calibration tests at different temperatures are required, a steel rod 1 with the same length of l is used as an experimental object, the steel rod 1 is respectively placed at different temperatures, end face signal acquisition is carried out through an ADC (analog-to-digital converter) chip and a single chip microcomputer, the time t of an end face wave packet signal is recorded, the propagation speed v of longitudinal mode guided waves in the steel rod at different temperatures can be calculated, and the propagation speed of the longitudinal mode guided waves in the steel rod at a target temperature can be controlled within a temperature range. And (3) taking the temperature of the experiment as an abscissa and the speed obtained by calculation at each temperature as an ordinate, so as to obtain the fitting relation between the temperature and the longitudinal mode wave guiding speed.
During actual work, the corresponding speed of each adjacent groove defect 6 section is obtained by processing signals acquired by the ADC and the single chip microcomputer under actual high-temperature conditions, and the speed is substituted into a calibrated related curve to obtain the temperature of the steel rod 2. If there is a large temperature difference between the liquid and the gas, the area with obvious temperature change measured in the experiment is the interface between the liquid and the gas, so as to obtain the liquid level height.
The present invention is not limited to the above-mentioned best mode, and any person should learn the structural changes made under the teaching of the present invention, all of which have the same or similar technical solution, and all fall into the protection scope of the present invention.
Claims (5)
1. The utility model provides a high temperature is magnetostrictive guided wave level gauge for liquid which characterized in that includes:
a ferromagnetic long rod (1), a magnetostrictive sensor (2) and a control circuit board (4);
the magnetostrictive sensor (2) comprises a sensor main body formed by an upper yoke (21) and a lower yoke (22) in a clamped mode through a permanent magnet (23), the sensor main body is of a hollow structure, and one end of the ferromagnetic long rod (1) penetrates through the hollow structure to be detachably connected with the magnetostrictive sensor (2); the ferromagnetic long rod (1) extends into the sensor main body part and is wound with a coil (3), and two ends of the coil (3) are connected with alternating current;
the ferromagnetic long rod (1) is a hollow rod, and a plurality of flanges (11) are uniformly arranged on the inner wall of the ferromagnetic long rod (1) in the vertical direction;
after the coil (3) is electrified, a dynamic alternating magnetic field and a bias magnetic field which are equidirectional along the axial direction of the ferromagnetic long rod (1) are generated, longitudinal mode guided waves are generated, reflected waves are generated when the longitudinal mode guided waves meet each flange (11) in the process of propagation, meanwhile, the magnetostrictive sensor (2) receives the reflected waves and determines the time for receiving each reflected wave, and the speed of the guided waves at each section of the ferromagnetic long rod (1) is calculated according to the speed of the excited longitudinal mode guided waves; obtaining a relation curve of temperature and the propagation speed of longitudinal mode guided waves in the ferromagnetic long rod (1) through a calibration test; thereby determining the liquid level position;
the control circuit board (4) comprises a power supply circuit, a single chip circuit, a liquid crystal display circuit, a power-on excitation circuit, an ADC acquisition circuit, a signal output circuit and a communication module; the control circuit board (4) is electrically connected with the coil (3) and controls the electrifying exciting circuit and the ADC acquisition circuit.
2. The magnetostrictive guided wave level gauge for high-temperature liquid according to claim 1, characterized in that a plurality of salient points are uniformly arranged on the inner wall of the long ferromagnetic rod (1) in the vertical direction to form the flange (11).
3. A magnetostrictive guided wave level gauge for high temperature liquids according to claim 1, characterized in that the body of the long ferromagnetic rod (1) forms the flange (11) by a groove formed from the outside to the inside.
4. A magnetostrictive guided wave level gauge for high temperature liquid according to claim 2 or 3, characterized in that the long ferromagnetic rod (1) is sleeved with a hook (12).
5. A magnetostrictive guided wave level gauge according to claim 2 or 3, characterized in that the long ferromagnetic rod (1) is a cylindrical ferromagnetic rod with a uniform wall thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020332200.8U CN212030674U (en) | 2020-03-17 | 2020-03-17 | Magnetostrictive guided wave liquid level meter for high-temperature liquid |
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| CN202020332200.8U CN212030674U (en) | 2020-03-17 | 2020-03-17 | Magnetostrictive guided wave liquid level meter for high-temperature liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521234A (en) * | 2020-03-17 | 2020-08-11 | 北京晨淼科技有限公司 | Magnetostrictive guided wave liquid level meter for high-temperature liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521234A (en) * | 2020-03-17 | 2020-08-11 | 北京晨淼科技有限公司 | Magnetostrictive guided wave liquid level meter for high-temperature liquid |
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