CN103592208A - Electromagnetic type oil metal particle monitoring sensor resistant to environmental magnetic field interference - Google Patents
Electromagnetic type oil metal particle monitoring sensor resistant to environmental magnetic field interference Download PDFInfo
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- CN103592208A CN103592208A CN201310569838.8A CN201310569838A CN103592208A CN 103592208 A CN103592208 A CN 103592208A CN 201310569838 A CN201310569838 A CN 201310569838A CN 103592208 A CN103592208 A CN 103592208A
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Abstract
The invention discloses an electromagnetic type oil metal particle monitoring sensor resistant to environmental magnetic field interference. The electromagnetic type oil metal particle monitoring sensor comprises a metal particle sensing unit and a smart transmitter, wherein the metal particle sensing unit is used for inducing and producing induced voltage when metal particles pass by the sensor; and the smart transmitter is used for generating an excitation signal required by the metal particle sensing unit, sending the excitation signal to the metal particle sensing unit, receiving an induced voltage signal output by the metal particle sensing unit, eliminating interference of an external environment magnetic field and influences of an excitation magnetic field, obtaining a useful signal induced when the metal particles pass by the sensor, performing analog-digital conversion and processing on the signal, eliminating circuit noise, recognizing and counting the metal particles and uploading information to a network. According to the sensor, the disturbance resisting capacity and the recognition capability of tiny metal particles can be improved, and a high-performance monitor is provided for on-line monitoring of metal particles in lubricating oil.
Description
Technical field
The invention belongs to online oil analysis field, be specifically related to the electromagnetic type fluid metallic particles monitoring sensor that a kind of anti-environmental magnetic field disturbs.
Background technology
Heavy mechanical equipment, when work, because mechanical wear produces metal worn particle, likely causes great mechanical fault once inordinate wear occurs machinery, causes tremendous economic loss and casualties.Electromagnetic type metallic particles monitoring sensor is for the monitoring to power lubrication fluid metallic particles quantity, size etc., once the metallic particles that exists inordinate wear to produce in discovery lubricating oil, maintainer can keep in repair equipment in time, realize the early warning of mechanical inordinate wear, prevent the generation of great mechanical accident.
When equipment generation inordinate wear, when wear particle passes sensor with fluid, because the volume of metallic particles is very little, the electric signal that inductive coil induction obtains is very faint, the interference often being produced by external environment magnetic field (as terrestrial magnetic field) is flooded, thereby makes minute metallic particle be difficult to detect.Thereby how to get rid of the interference in the external environment condition magnetic fields such as terrestrial magnetic field, and improve the recognition capability of minute metallic abrasive particle, be that puzzlement improves the difficult point that electromagnetic type fluid metallic particles monitoring sensor detects performance and reliability always.In decades, researcher has proposed many technical schemes round how getting rid of external magnetic field interference.
Peter Donald Baker in 1978 and Derek Ernest Marsh have proposed to adopt the coil measurement that is wrapped in two series connection on the oil pipe metallic particles method (referring to Fig. 1) in the liquid of oil pipe of flowing through in patent GB2004374A, the method by measuring coil 1 ', 2 ' be wrapped in fluid circuit 3 ' on, the AC signal of a 100kHz of oscillator 4 ' load measuring coil 1 ', 2 ' and magnetic compensation coil 12 ', 13 ' on, by measuring coil 1 ', 2 ' and magnetic compensation coil 12 ', 13 ' centre tap access amplifier 6 ', adjust the balance of four coils, make two same width of tapped voltage, homophase (eliminating pumping signal).Do not have metallic particles by time amplifier be output as zero, when having metallic particles to pass through, this balance is broken, between two centre taps, there is the signal intensity corresponding with metallic particles, this signal through low-pass filter 8 ', wave detector 9 ' and the information of impulse meter 10 ' acquisition metallic particles, the shortcoming of the method is special compensating circuit to be set to geomagnetic noise, and whether the detectable minimum metal particle of this patent can meet commercial unit request for utilization and be not confirmed, do not see relevant Product Report yet.
The Jiang Weiping of ningbo of china proposes to install on oil pipe three coils in patent CN 102331390 A, two, both sides coil produces the alternating magnetic field that both direction is contrary under extraneous pumping signal drives, and to make the alternating magnetic field that medium line is irised out be zero (eliminating pumping signal).While there is metallic particles in oil pipe, this balance is broken, and intermediate coil is exported non-vanishing signal, by the detection to this signal, knows the existence of metallic particles in oil pipe.There is magnetic compensation problem in this technology, and in order to realize the symmetry of two electromagnetic fields, two coils need to be set with respect to the adjusting mechanism of intermediate coil, and adjustment difficulty is very large equally.
In sum, how eliminating the interference of external environment magnetic field to electromagnetic type metallic particles monitoring sensor, strengthen the detectability of the faint induction output signal of sensor simultaneously, is to improve the key that sensor detects performance.
Summary of the invention
The object of the invention is, for the problem of prior art, the electromagnetic type fluid metallic particles monitoring sensor that provides a kind of anti-environmental magnetic field to disturb, to improve antijamming capability and the recognition capability to minute metallic particle.
The electromagnetic type fluid metallic particles monitoring sensor that anti-environmental magnetic field provided by the invention disturbs, comprising:
Metallic particles sensing unit, produces the induced voltage of metallic particles when by metallic particles sensing unit in order to induction;
Intelligent transducer, in order to produce the necessary pumping signal of metallic particles sensing unit, and give metallic particles sensing unit by pumping signal, receive the induced voltage signal of metallic particles sensing unit output, eliminate the impact of external environment condition magnetic interference and excitation field, the useful signal that acquisition is responded to by metallic particles sensing unit because of metallic particles, this signal is carried out to analog to digital conversion and data processing, further eliminate circuit noise, and metallic particles is identified and counted, finally particle information is uploaded to network.
Described metallic particles sensing unit comprises permeability magnetic material shell, is provided with drive coil and first, second inductive coil that is positioned at drive coil both sides in shell.
Described intelligent transducer comprises: the exciting signal source being connected with drive coil; First, second prime amplifier being connected with first, second inductive coil respectively; First, second phase converter being connected with the first and second prime amplifiers respectively; The differential amplifier being connected with first, second phase converter; The detuner being connected with differential amplifier; The polystage amplifier being connected with detuner and wave filter; The microprocessor being connected with amplifier; The communication interface being connected with microprocessor; Communication interface is connected with main control computer.
During use, metallic particles sensing unit in the present invention is connected on fluid pipeline, exciting signal source produces alternation driving voltage and sends into drive coil, drive coil produces alternating magnetic field at the surveying range of fluid pipeline, inductive coil produces induced voltage under action of alternating magnetic field, whether, when having metallic particles to flow through sensing unit, induced voltage can change, and the size that the variation of induced voltage has comprised reflection metallic particles, be the information such as ferromagnetic particle; Intelligent transducer is processed the induced voltage signal by the output of metallic particles sensing unit inductive coil, and realizes the elimination of the impact of external environment condition magnetic interference and excitation field, obtains obtaining the small useful signal of reflection metallic particles information; Microprocessor gathers this signal, and is embedded with feeble signal Processing Algorithm this output signal is further processed, and strengthens signal to noise ratio (S/N ratio), improves the recognition capability to minute metallic abrasive particle, completes the counting of metallic particles and size are added up; Microprocessor by communication interface, complete simultaneously and main control computer between data transmission.
The present invention is according to electromagnetic induction principle, while utilizing metallic particles to pass through alternating magnetic field, and the disturbance to magnetic field, thus in inductive coil, produce size and the character that voltage signal detects metallic particles.
Feature of the present invention is: be to utilize the interference that responsive external magnetic field is introduced simultaneously of two inductive coils, then by the processing of pre-amplification circuit and phase modulation circuit, make external magnetic field disturb the output of caused two inductive coils closely similar, by amplitude modulation and phase modulation circuit, make the signal of two inductive coil outputs in full accord again, two on all four signals are sent into after difference channel processing, realize the automatic elimination of undesired signal, improved antijamming capability, and for the structure of sensor sensing coil, the symmetry of size require greatly to reduce; In microprocessor, embed feeble signal Processing Algorithm, strengthen the recognition capability of sensor to minute metallic particle simultaneously.
Below in conjunction with accompanying drawing, further illustrate embodiment of the present invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art.
Fig. 2 is the structural representation of metallic particles sensing unit in the present invention.
Fig. 3 is structure composition frame chart of the present invention.
Fig. 4 is that diameter is the ferromagnetic metal particle figure of 96 μ m.
Fig. 5 is the ferromagnetic metal particle that the collects characteristic signal figure during by metallic particles sensing unit.
Fig. 6 is the output waveform figure of signal shown in Fig. 5 after feeble signal is processed.
Embodiment
See Fig. 2, Fig. 3, the present invention includes metallic particles sensing unit, two parts of intelligent transducer, wherein: metallic particles sensing unit (referring to Fig. 2), comprise annular permeability magnetic material shell (shell also other shape) 1, in shell 1, be provided with drive coil 3 and be positioned at first, second inductive coils 2,4 of drive coil 3 both sides; Intelligent transducer (referring to Fig. 3), comprising: the exciting signal source 7 being connected with drive coil 3; First, second prime amplifier 8,9 being connected with first, second inductive coil 2,4 respectively; First, second phase converter 10,11 being connected with the first and second prime amplifiers 8,9 respectively; The differential amplifier 12 being connected with first, second phase converter 10,11; The detuner 13 being connected with differential amplifier 12, drive coil 3, exciting signal source 7; The detuner 13 being linked in sequence, bandpass filter 14, classification amplifier 15, low-pass filter 16, classification amplifier 17, low-pass filter 18, classification amplifier 19, low-pass filter 20; Microprocessor 21 and the communication interface 22 being connected with microprocessor 21, microprocessor 21 is connected with low-pass filter 16,18,20, and described communication interface 22 is connected with main control computer 23.
The alternation driving voltage that exciting signal source 7 in intelligent transducer produces is sent into drive coil 3, drive coil 3 produces alternating magnetic field at the surveying range of fluid pipeline, inductive coil 2,4 produces induced voltage under action of alternating magnetic field, the interference that terrestrial magnetic field produces in inductive coil 2,4 is in-phase interference signal, this undesired signal will be together with pumping signal in follow-up signal is processed automotive resistance; When metallic particles 6 will cause that the induced voltage of inductive coil 2,4 changes during through coil, and the size that the variation of induced voltage has comprised reflection metallic particles, whether be the information such as ferromagnetic particle.The induced voltage of inductive coil 2,4 is sent into respectively the signal that intelligent transducer processes to obtain characterizing metal particle size; The alternating magnetic field that permeability magnetic material 1 produces drive coil 3 is controlled at certain area, reduces the iron loss being produced by metal shell, can also reduce the impact of external magnetic field on sensor simultaneously.
The inductive coil 2 of metallic particles sensing unit, 4 signals that produce are sent into respectively the first and second prime amplifiers 8, 9, through the first and second prime amplifiers 8, 9 signals of processing the identical amplitude of acquisition are sent into the first and second phase converters 10, 11 phase modulation, two-way output signal after phase modulation, send into differential amplifier 12, after differential amplifier 12 is processed, form a signal of having eliminated most pumping signals and Geomagnetic signal, again this signal is sent into detuner 13, through detuner 13 demodulation, bandpass filter 14 filtering, eliminate pumping signal, obtain the useful signal of reflection metallic particles information, this useful signal input microprocessor 21 after amplifier 15 amplifications and low-pass filter 16 filtering carries out signals collecting and processing, utilize this signal can identify and the ferromagnetic metal particle of 300 microns of statistic diameters and above size, the output signal of low-pass filter 16 is sent into next stage amplifier 17 simultaneously and is done further to amplify, amplifier 17 output after low-pass filter 18 filtering also input microprocessor 21 gathers and processing, utilize this signal can identify 150 microns of statistic diameters to the ferromagnetic metal particle in 300 micrometer ranges, the output signal of low-pass filter 18 is sent into next stage amplifier 19 simultaneously and is done further to amplify, amplifier 19 output input microprocessor 21 after low-pass filter 20 filtering gathers and processes, and utilizes the signal of this collection can identify 100 microns of statistic diameters also to the ferromagnetic metal particle in 150 micrometer ranges.This amplifying circuit being comprised of some grades of amplifiers and low-pass filter, can realize the sample grading to metallic particles signal, to obtain accurate metal particle size information.
When carrying out data acquisition, the feeble signal Processing Algorithm that microprocessor 21 is embedded, the signal processing algorithm that adopts Digital smooth filtering to combine with least mean-square error auto adapted filtering, can further strengthen signal collected signal to noise ratio (S/N ratio), improve the recognition capability to minute metallic particle.Microprocessor 21 identifications obtain the data messages such as the interior metallic particles quantity through sensor of certain hour section, size, this information communicates through communication interface 22 and main control computer 23, and microprocessor 21 also has the functions such as product coding setting, network address setting, excitation frequency and the setting of signal processing key parameter, value demarcation and verification, metallic particles identification statistics, data upload, multisensor group net operation simultaneously.
With an instantiation, beneficial effect of the present invention is described below:
In example, first small ferromagnetic metal particle is bonded on plastic tape, is made into test sample, wherein by microscope, to record diameter be 96 to ferromagnetic metal particle
μ m, as shown in Figure 4.
Test sample is passed to sensor with manual mode, Figure 5 shows that microprocessor collects the metallic particles that obtains by the signal of sensor, due to sensor by circuit to external world undesired signal carried out denoising Processing, therefore from waveform shown in Fig. 5, can obviously find out the waveform that has a upper and lower pulse this signal, and this characteristic signal when metallic particles is by electromagnetic sensor just.But because metal particle size is less, diameter only has 96
μ malthough, through oversampling circuit, disturb to external world and carried out Processing for removing, in signal, still have many noises, affected the accurate identification to metallic particles.Fig. 6 is the signal waveform that Fig. 5 signal obtains after feeble signal Processing Algorithm is processed, as seen from the figure, after feeble signal is processed, Signal-to-Noise is enhanced, be easier to identify the feature of metallic particles, improved the recognition capability of sensor to minute metallic particle.
These results suggest that electromagnetic type fluid metallic particles monitoring sensor provided by the present invention can responsively detect minimum diameter and be not more than 100
μ mferromagnetic metal particle, intelligent transducer can be realized the automatic elimination of external interference signal, the feeble signal Processing Algorithm that embeds microprocessor can further improve the signal to noise ratio (S/N ratio) of output signal, utilizes the present invention can improve the monitoring capability of online fluid metallic particles.
Claims (3)
1. the electromagnetic type fluid metallic particles monitoring sensor that anti-environmental magnetic field disturbs, is characterized in that comprising:
Metallic particles sensing unit, produces the induced voltage of metallic particles when by metallic particles sensing unit in order to induction;
Intelligent transducer, in order to produce the necessary pumping signal of metallic particles sensing unit, and give metallic particles sensing unit by pumping signal, receive the induced voltage signal of metallic particles sensing unit output, eliminate the impact of external environment condition magnetic interference and excitation field, the useful signal that acquisition is responded to by metallic particles sensing unit because of metallic particles, this signal is carried out to analog to digital conversion and data processing, further eliminate circuit noise, and metallic particles is identified and counted, finally particle information is uploaded to network.
2. the electromagnetic type fluid metallic particles monitoring sensor that anti-environmental magnetic field according to claim 1 disturbs, it is characterized in that described metallic particles sensing unit comprises permeability magnetic material shell, in shell, be provided with drive coil and first, second inductive coil that is positioned at drive coil both sides.
3. the electromagnetic type fluid metallic particles monitoring sensor that anti-environmental magnetic field according to claim 2 disturbs, is characterized in that described intelligent transducer comprises: the exciting signal source being connected with drive coil; First, second prime amplifier being connected with first, second inductive coil respectively; First, second phase converter being connected with the first and second prime amplifiers respectively; The differential amplifier being connected with first, second phase converter; The detuner being connected with differential amplifier; The polystage amplifier being connected with detuner and wave filter; The microprocessor being connected with amplifier; The communication interface being connected with microprocessor; Communication interface is connected with main control computer.
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| CN105424569A (en) * | 2015-12-11 | 2016-03-23 | 天津成科传动机电技术股份有限公司 | Oil product particle detection device with light source fluctuating correction function |
| CN105758782A (en) * | 2014-12-19 | 2016-07-13 | 江苏卓微生物科技有限公司 | Portable rapid particle detection apparatus and working method thereof |
| CN107589171A (en) * | 2017-11-08 | 2018-01-16 | 湖南挚新科技发展有限公司 | Contained metal detection system in fluid pipeline |
| CN107907455A (en) * | 2017-12-05 | 2018-04-13 | 西人马（厦门）科技有限公司 | A kind of magnetic induction grain testing apparatus and concentration detection method |
| CN108415089A (en) * | 2018-03-08 | 2018-08-17 | 安徽容知日新科技股份有限公司 | A kind of fluid metallic particles detection device |
| CN109283102A (en) * | 2018-08-22 | 2019-01-29 | 四川新川航空仪器有限责任公司 | A kind of real-time monitoring system of movable machinery component wear state |
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| CN107589171A (en) * | 2017-11-08 | 2018-01-16 | 湖南挚新科技发展有限公司 | Contained metal detection system in fluid pipeline |
| WO2019109872A1 (en) * | 2017-12-05 | 2019-06-13 | 西人马联合测控（泉州）科技有限公司 | Detection system and method for concentration fluid nonmetal particles |
| WO2019109870A1 (en) * | 2017-12-05 | 2019-06-13 | 西人马联合（泉州）科技有限公司 | Magnetic induction particle detection device and concentration detection method |
| CN107907455A (en) * | 2017-12-05 | 2018-04-13 | 西人马（厦门）科技有限公司 | A kind of magnetic induction grain testing apparatus and concentration detection method |
| US11099113B2 (en) | 2017-12-05 | 2021-08-24 | Fatri United Testing & Control (Quanzhou) Technologies Co., Ltd. | Detection system and method for concentration fluid nonmetal particles |
| CN108415089A (en) * | 2018-03-08 | 2018-08-17 | 安徽容知日新科技股份有限公司 | A kind of fluid metallic particles detection device |
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| CN112484771A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Monitoring method of pipe cleaner |
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| CN115597871A (en) * | 2022-10-24 | 2023-01-13 | 中国人民解放军93208部队（Cn） | Airborne health diagnosis device for mechanical system of military turbofan engine |
| CN115597871B (en) * | 2022-10-24 | 2023-10-31 | 中国人民解放军93208部队 | Onboard health diagnosis device for mechanical system of military turbofan engine |
| CN117470948A (en) * | 2023-10-18 | 2024-01-30 | 苏州仁正智探科技有限公司 | Induction type oil dust signal monitoring and identifying system and method |
| CN117470948B (en) * | 2023-10-18 | 2024-06-07 | 苏州仁正智探科技有限公司 | Induction type oil dust signal monitoring and identifying system and method |
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Application publication date: 20140219 |