CN110208167A - A kind of lubricant oil metal wear particle detection device that can distinguish bubble and detection method - Google Patents
A kind of lubricant oil metal wear particle detection device that can distinguish bubble and detection method Download PDFInfo
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- CN110208167A CN110208167A CN201910534004.0A CN201910534004A CN110208167A CN 110208167 A CN110208167 A CN 110208167A CN 201910534004 A CN201910534004 A CN 201910534004A CN 110208167 A CN110208167 A CN 110208167A
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- 239000002184 metal Substances 0.000 title claims abstract description 123
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 123
- 239000002245 particle Substances 0.000 title claims abstract description 103
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 239000000314 lubricant Substances 0.000 title claims abstract description 21
- 239000010687 lubricating oil Substances 0.000 claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 239000006061 abrasive grain Substances 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 230000003750 conditioning effect Effects 0.000 claims abstract description 27
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 25
- 239000003921 oil Substances 0.000 claims abstract description 25
- 239000011241 protective layer Substances 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims description 56
- 230000006698 induction Effects 0.000 claims description 31
- 230000004323 axial length Effects 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- -1 when installation Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000005291 magnetic effect Effects 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention discloses a kind of lubricant oil metal wear particle detection devices that can distinguish bubble, including the three solenoid sensor being mounted on lubricating oil transmission pipeline and capacitance sensor；The central axis of lubricating oil conveyance conduit, three solenoid sensor and capacitance sensor three is conllinear；Three solenoid sensor is connected with for detecting the first signal conditioning module for incuding solenoidal induced electromotive force, and capacitance sensor is made of capacitor positive electrode, capacitor negative electrode and capacitor protective layer, when installation, capacitor negative electrode ground connection；Capacitance sensor is connected with the second signal conditioning module of the capacitance for detecting capacitance sensor by triaxial cable, voltage signal after conversion is exported and gives AD acquisition module by the first and second signal conditioning module, while then realizing accurate detection using size of the computing module to Metals In Lubricating abrasive grain, additionally it is possible to realize the differentiation of non-ferromagnetic abrasive grain and bubble.
Description
Technical field
The present invention relates to lubricating oil metal worn particle detection field, especially a kind of lubricant oil metal abrasive grain inspection that can distinguish bubble
Survey method and device.
Background technique
Usually carry large number of equipment wear information, the lubrication that people pass through flowing in detection device in equipment lubrication oil
Oil, indirectly extract equipment wear information diagnose wear-out failure, for prediction wear trend and identification wear pattern provide according to
According to.Lubricant oil metal wear particle detection method traditional at present is mainly supersonic testing method, capacitance detecting method and inductance detection method.
Supersonic testing method is that the ultrasonic wave issued using sensor is emitted to the scattering properties that can occur on abrasive grain to detect
The size and distribution of abrasive grain, it can differentiate bubble, water droplet in lubricating oil, also have certain resolving power to the abrasive grain of different components,
Lubricating oil does not need to pre-process simultaneously, to realize on-line checking；But supersonic testing method can only detect size in oil liquid and be less than
100 μm of abrasive grain, and cannot identify the abrasive grain is metal worn particle or nonmetallic abrasive grain, to cannot be lost for analytical equipment
It imitates the information such as the position of abrasion and more help is provided；
Capacitance detecting method mainly utilizes metal worn particle in capacitance sensor detection oil liquid.Capacitance type sensor is will to be tested
The variation of non electrical quantity is converted to a kind of sensor of electric capacitance change, but this method is only capable of the change of iron content in detection oil liquid
Change, the size of metal worn particle cannot be detected；
Inductance detection method mainly identifies the size of abrasive grain by the variation after detection electroreception metal worn particle influence, still
This method is difficult to distinguish ferromagnetic grain and non-ferromagnetic abrasive grain, be easy to cause erroneous judgement and " false-alarm ".
Summary of the invention
For the above-mentioned prior art, the present invention devises the lubrication of a kind of combination capacitance measurement technique and inductance detection technology
Oily metal worn particle detection method and device, the present invention accurately detect same in the size realization to Metals In Lubricating abrasive grain
When, additionally it is possible to realize the differentiation of non-ferromagnetic abrasive grain and bubble.
In order to solve the above-mentioned technical problem, it is difficult between the bubble and non-ferromagnetic abrasive grain in lubricating oil in the prior art to overcome
The problem of to distinguish, provides a kind of method and apparatus based on capacitance sensor and three solenoid sensor combined measurement, real
The differentiation of existing bubble and ferromagnetic grain.
A kind of lubricant oil metal wear particle detection device that can distinguish bubble proposed by the present invention, including it is mounted on lubricating oil biography
Three solenoid sensor on defeated pipeline is also equipped with a capacitance sensor on the lubricating oil transmission pipeline；The lubrication
The central axis of oily conveyance conduit, three solenoid sensor and capacitance sensor three is conllinear；The three solenoid sensor by
First excitation solenoid, the second excitation solenoid and induction solenoid group are at the induction solenoid is connected with the first signal tune
Module is managed, the first signal conditioning module is converted into voltage letter for detecting the solenoidal induced electromotive force of induction
Number output to an AD acquisition module；The capacitance sensor is made of capacitor positive electrode, capacitor negative electrode and capacitor protective layer, peace
When dress, the capacitor negative electrode ground connection；The capacitance sensor is connected with second signal conditioning module, institute by triaxial cable
Second signal conditioning module is stated for detecting the capacitance of capacitance sensor, at the same by capacitance be converted to voltage signal export to
The AD acquisition module；Collection result is transferred to computing module by the AD acquisition module, is distinguished and is moistened using the computing module
Metal worn particle and bubble in lubricating oil conveyance conduit, and calculate the size of metal worn particle；The computing module is by calculated result
It is transferred to host computer, the host computer counts metal worn particle according to calculated result.
Further, the present invention can distinguish the lubricant oil metal wear particle detection device of bubble, wherein the first excitation spiral shell
Spool, the second excitation solenoid and induction solenoid are placed along the axial location of the three solenoid sensor；Described
One excitation solenoid and second solenoidal the number of turns of excitation are identical and around to opposite, coil axial length is identical, the first excitation spiral shell
It connects after spool and the second excitation solenoid indirect current and is symmetrically placed centered on incuding solenoid.
Further, the present invention can distinguish the lubricant oil metal wear particle detection device of bubble, wherein the capacitance sensor
The capacitor protective layer and the capacitor negative electrode be centered around on the outer surface of the lubricating oil transmission pipeline, the capacitor is protected
Sheath is equipped with a square hole axially arranged along the lubricating oil transmission pipeline, axis of the square hole in the lubricating oil transmission pipeline
It is equal to the length L of the capacitor positive electrode to length, the capacitor positive electrode is inlaid in the square hole.
The present invention proposes the detection method using the above-mentioned lubricant oil metal wear particle detection device that can distinguish bubble,
The following steps are included:
The induction solenoid of the three solenoid sensor is connected with the first signal conditioning module, first signal condition
The solenoidal induced electromotive force of the module detection induction, and be converted into voltage signal and export and give AD acquisition module；
The capacitance sensor is connected by triaxial cable with second signal conditioning module, second signal conditioning module
The capacitance of the capacitance sensor is detected, meanwhile, capacitance is converted into voltage signal and is exported to the AD acquisition module；
Collection result is transferred to computing module by the AD acquisition module；
The computing module passes through the capacitance variations of detection capacitance sensor, and in conjunction with the electricity of the three solenoid sensor
Sense variation, distinguishes the metal worn particle and bubble in lubricating oil transmission pipeline, and calculate the size of metal worn particle；
Calculated result is transferred to the host computer by the computing module, and the host computer grinds metal according to calculated result
Grain statistics.
Further, in the lubricant oil metal wear particle detection method of the present invention that bubble can be distinguished,
When metal worn particle enters in the first excitation solenoid or the second excitation solenoid, it is assumed that metal worn particle is standard
Spherical shape, the first excitation solenoid and second solenoidal the number of turns of excitation are identical and around to opposite, coil axial length is identical, described
First excitation solenoid or the second solenoidal inductance variable quantity of excitation are as follows:
Wherein, μ1For the relative permeability of metal worn particle, rdFor metal worn particle radius, N1For the first excitation solenoid or the
Two excitation solenoid coil the number of turns, l1For the first excitation solenoid or the second solenoidal coil axial length of excitation, μ0For vacuum magnetic conductance
Rate；Inductance change rate are as follows:
Wherein, LcTo incude solenoid original inductance, L'cFor the inductance after induction solenoid variation；
If metal worn particle is feeromagnetic metal abrasive grain, the amplitude of the induction solenoid output signal and the size of metal worn particle
Size is directly proportional, incudes the amplitude V of solenoid output signalL, VLExpression formula are as follows:
In formula, M, B are constant, and then pass through measurement VLSize, the size of ferromagnetic grain can be measured；
If metal worn particle is non-ferromagnetic metal abrasive grain, the induced electromotive force expression formula of induction solenoid (9) are as follows:
Wherein, K is constant, and v is lubricating oil flow velocity；μ1For the relative permeability of metal worn particle, rdFor metal worn particle half
Diameter.
Further, the present invention can distinguish in the lubricant oil metal wear particle detection method of bubble, and the computing module is distinguished
Metal worn particle and bubble in lubricating oil transmission pipeline, and calculate metal worn particle size detailed process is as follows:
If capacitance value reduces, there is bubble to pass through in lubricating oil transmission pipeline；
If capacitance value increases, and the output signal first increases and then decreases of the three solenoid sensor, then
There is metal worn particle to pass through in lubricating oil transmission pipeline, and the metal worn particle is feeromagnetic metal abrasive grain, is calculated according to formula (2)
The diameter of the metal worn particle；
If capacitance value increases, and the output signal of the three solenoid sensor first reduces and increases afterwards, then
There is metal worn particle to pass through in lubricating oil transmission pipeline, and the metal worn particle is non-ferromagnetic metal abrasive grain, is calculated according to formula (3)
The diameter of the metal worn particle out.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention and device combine capacitance measurement technique and inductance detection technology, solve conventional method and are difficult to area
The problem for dividing bubble and ferromagnetic grain, keeps final testing result more accurate；
(2) capacitance sensor designed by of the invention and device is different from the sensor that tradition only has positive and negative electrode, by just
Electrode, negative electrode and protective layer three composition；Based on the special construction of capacitance sensor in the method for the present invention and device, the capacitor
The capacitance of sensor is only related with the length of sensor electrode, thus greatly reduces brought by sensor installation and production
Error；
Detailed description of the invention
Fig. 1 shows the main functional diagram of lubricant oil metal wear particle detection method and device of the present invention；
Fig. 2-1 is the side view of capacitor sensor structure in the present invention；
Fig. 2-2 is the cross-sectional view of capacitor sensor structure shown in Fig. 2-1；
Fig. 2-3 is the axial sectional diagrammatical view illustration of capacitor sensor structure shown in Fig. 2-1.
In figure: 1- capacitor positive electrode；2- capacitor protective layer；3- capacitor negative electrode；4- capacitance sensor；The conveying of 5- lubricating oil
Pipeline；6- metal worn particle；7- bubble；8- second motivates solenoid；9- incudes solenoid；10- first motivates solenoid；11- tri-
Solenoid sensor；12- triaxial cable；13- second signal conditioning module；The first signal conditioning module of 14-；15-AD acquisition
Module；16- computing module；17- host computer.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair
It is bright to have any restrictions.
In general, the metal worn particle in lubricating oil conveyance conduit is divided into two kinds, i.e. metal ferromagnetic grain and the non-ferromagnetic mill of metal
Grain, is furthermore also mingled with the testing result that bubble will affect metal worn particle in lubricating oil.
As shown in Figure 1, a kind of lubricant oil metal wear particle detection device that can distinguish bubble proposed by the present invention, including installation
Three solenoid sensor 11 and a capacitance sensor 4 on lubricating oil transmission pipeline 5；The lubricating oil conveyance conduit 5, three
Solenoid sensor 11 is conllinear with the central axis of 4 three of capacitance sensor.
The three solenoid sensor 11 motivates 9 groups of solenoid of solenoid 10 and induction by the first excitation solenoid 8, second
At the first excitation solenoid 10, second motivates solenoid 8 and induction solenoid 9 along the three solenoid sensor 11
Axial location place；The first excitation solenoid 8 is identical with the number of turns of the second excitation solenoid 10 and around on the contrary, institute
It connects after stating the first excitation solenoid 10 and the second excitation 8 indirect current of solenoid and is symmetrically pacified centered on incuding solenoid 9
It puts.The induction solenoid 9 is connected with the first signal conditioning module 14, and the first signal conditioning module 14 is for detecting the induction
The induced electromotive force of solenoid 9, and be converted into voltage signal and export to an AD acquisition module 15.
As shown in Fig. 2-1, Fig. 2-2 and Fig. 2-3, the capacitance sensor 4 in the present invention is by capacitor positive electrode 1, capacitor
Negative electrode 3 and capacitor protective layer 2 form, and the capacitor protective layer 2 and the capacitor negative electrode 3 are centered around the lubricating oil transmission
On the outer surface of pipeline 5, the capacitor protective layer 2 is equipped with a square hole axially arranged along the lubricating oil transmission pipeline 5, described
Square hole is equal to the length L of the capacitor positive electrode 1, the capacitor positive electrode in the axial length of the lubricating oil transmission pipeline 5
It is inlaid in the square hole.When installation, the capacitor negative electrode 3 is grounded；The capacitance sensor 4 is connected by triaxial cable 12
It is connected to second signal conditioning module 13, the second signal conditioning module 13 is used to detect the capacitance of capacitance sensor 4, simultaneously
Capacitance is converted to voltage signal to export to the AD acquisition module 15；Collection result is transferred to by the AD acquisition module 15
Computing module 16 is distinguished the metal worn particle 6 and bubble 7 in lubricating oil conveyance conduit 5 using the computing module 16, and is calculated
The size of metal worn particle 6；Calculated result is transferred to host computer 17 by the computing module 16, and the host computer 17 is tied according to calculating
Fruit counts metal worn particle 6.
Using the detection method of the lubricant oil metal wear particle detection device proposed by the present invention that can distinguish bubble, including it is following
Step:
The induction solenoid 9 of the three solenoid sensor 11 is connected with the first signal conditioning module 14, first letter
Number conditioning module 14 detects the induced electromotive force of the induction solenoid 9, and is converted into voltage signal and exports and give AD acquisition
Module 15；
The capacitance sensor 4 is connected by triaxial cable 12 with second signal conditioning module 13, second signal tune
Reason module 13 detects the capacitance of the capacitance sensor 4, meanwhile, it capacitance is converted into voltage signal exports and adopted to the AD
Collect module 15；
Collection result is transferred to computing module 16 by the AD acquisition module 15；
The computing module 16 passes through the capacitance variations of detection capacitance sensor 4, and in conjunction with the three solenoid sensor
11 inductance variation, distinguishes the metal worn particle 6 and bubble 7 in lubricating oil transmission pipeline 5, and calculate the size of metal worn particle 6；
Calculated result is transferred to the host computer 17 by the computing module 16, and the host computer 17 is according to calculated result pair
Metal worn particle statistics.
When no metal worn particle passes through three solenoid sensor 11, it is assumed that the radius of lubricating oil conveyance conduit 5 is remote
Less than all solenoid axial lengths, then the magnetic field that the first excitation solenoid 10 and the second excitation solenoid 8 generate can indicate are as follows:
In formula, μ0For space permeability, l1To motivate solenoidal axial length.Therefore, the first excitation solenoid 10 and second swashs
Encourage the magnetic field of the generation of solenoid 8 be it is equal big reversed, cancel out each other, be now placed in intermediate at intermediate induction solenoid 9
Induction solenoid 9 is in zero magnetic field, induced electromotive force zero.
When metal worn particle 6 enters in the first excitation solenoid 10 or the second excitation solenoid 8, the entrance of metal worn particle 6
It can cause the variation of magnetic induction intensity, so that the first excitation solenoid 10 or the localized inductance of the second excitation solenoid 8 be enabled to generate
Variation, it is assumed that metal worn particle 6 is standard spherical shape, and the first excitation solenoid 10 is identical with the second excitation 8 coil turn of solenoid,
Coil axial length is identical, the inductance variable quantity of the first excitation solenoid 10 or the second excitation solenoid 8 are as follows:
Wherein, μ1For the relative permeability of metal worn particle, rdFor metal worn particle radius, N1For first excitation solenoid 10 or
Second excitation 8 coil turn of solenoid, l1For the coil axial length of the first excitation solenoid 10 or the second excitation solenoid 8, μ0It is true
Empty magnetic conductivity；Inductance change rate caused by then being entered due to metal worn particle 6 or bubble 7 are as follows:
Wherein, LcFor the former inductance of induction solenoid (9), L'cFor the inductance after induction solenoid (9) variation；
If metal worn particle is feeromagnetic metal abrasive grain, magnetic conductivity is far longer than 1, induction 9 output signal of solenoid
Amplitude is directly proportional to the size of metal worn particle, incudes the amplitude V of 9 output signal of solenoidL, VLExpression formula are as follows:
In formula, M, B are constant, and then pass through measurement VLSize, the size of ferromagnetic grain can be measured；
For bubble, when bubble 7 enters the first excitation solenoid 10 or the second excitation solenoid 8, in addition to causing inductance
Variation outside, capacitor can be also generated between solenoid, the transformation of capacitor and inductance can all act on the first signal conditioning module
14, cause the signal conditioning module to export a pulse signal similar with ferromagnetic grain；And then lead to ferromagnetic grain 6 and bubble
7 are difficult to differentiate between.
For non-ferromagnetic abrasive grain, the eddy-current loss that is generated when non-ferromagnetic metal worn particle 6 being passed through solenoid in the present invention
As the foundation for determining abrasive grain size, relationship between output signal and the size of abrasive grain is obtained.Metal worn particle 6 is all to have resistance
, so a part of electromagnetic energy will be consumed when generating vortex phenomenon, if metal worn particle 6 is non-ferromagnetic metal abrasive grain, institute
State the induced electromotive force expression formula of induction solenoid 9 are as follows:
Wherein, K is constant, and v is lubricating oil flow velocity；μ1For the relative permeability of metal worn particle, as flow velocity lubricating oil v
With the relative permeability μ of metal worn particle1When known, the diameter r of non-ferromagnetic metal abrasive grain can be determinedd。
In the present invention, the capacitor negative electrode 3 of capacitance sensor 4 is grounded；Pass through capacitor in no metal worn particle 6 or bubble 7
When sensor 4, capacitance is
In formula, K is constant, and L is capacitor positive electrode length, and ε is dielectric constant；Capacitor positive electrode, negative electrode and protection
Layer between gap be believed that it is infinitely small, at this moment according to the principles of electrostatics of calculable capacitor, between positive electrode and negative electrode
Capacitor is unrelated with electrode shape and pole plate spacing, and the capacitor is only related with pole plate length L；Therefore, which can be effective
Avoid the influence of installation error and sensor mismachining tolerance to measurement result.
For metal worn particle, no matter it is ferromagnetic grain or non-ferromagnetic abrasive grain all can after entering capacitance sensor 4
Cause the increase of dielectric constant ε, and then causes the increase of capacitance value C；And the entrance of bubble 7, it can cause to be situated between
The reduction of electric matter constant ε, and then cause the reduction of capacitance value C.
In the present invention, the computing module 16 combines three solenoid to pass by detecting the capacitance variations of capacitance sensor 4
The inductance of sensor 11 changes, so that it may judge the metal worn particle 6 and bubble 7 in lubricating oil transmission pipeline 5, and calculate metal
Detailed process is as follows for abrasive grain size:
If 4 capacitance of capacitance sensor reduces, there is bubble 7 to pass through in lubricating oil transmission pipeline 5, without carrying out size meter
It calculates.
If 4 capacitance of capacitance sensor increases, and the output signal first increases and then decreases of the three solenoid sensor 11,
Then there is metal worn particle 6 to pass through in lubricating oil transmission pipeline 5, and the metal worn particle is feeromagnetic metal abrasive grain, is counted according to formula (2)
Calculate the diameter of the metal worn particle.
If 4 capacitance of capacitance sensor increases, and the output signal of the three solenoid sensor 11 first reduces and increases afterwards,
Then there is metal worn particle 6 to pass through in lubricating oil transmission pipeline 5, and the metal worn particle is non-ferromagnetic metal abrasive grain, according to formula (3)
Calculate the diameter of the metal worn particle.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations
Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention
Within protection.
Claims (6)
1. a kind of lubricant oil metal wear particle detection device that can distinguish bubble, including being mounted on lubricating oil transmission pipeline (5)
Three solenoid sensor (11), it is characterised in that:
A capacitance sensor (4) is also equipped on the lubricating oil transmission pipeline (5)；The lubricating oil conveyance conduit (5), three
The central axis of solenoid sensor (11) and capacitance sensor (4) three are conllinear；
The three solenoid sensor (11) is by the first excitation solenoid (10), the second excitation solenoid (8) and induction solenoid
(9) it forms, the induction solenoid (9) is connected with the first signal conditioning module (14), and the first signal conditioning module (14) is used for
The induced electromotive force of induction solenoid (9) is detected, and is converted into voltage signal and exports to an AD acquisition module (15)；
The capacitance sensor (4) is made of capacitor positive electrode (1), capacitor negative electrode (3) and capacitor protective layer (2), when installation,
Capacitor negative electrode (3) ground connection；The capacitance sensor (4) is connected with second signal by triaxial cable (12) and improves mould
Block (13), the second signal conditioning module (13) are used to detect the capacitance of capacitance sensor (4), while capacitance being converted
It exports for voltage signal to the AD acquisition module (15)；
Collection result is transferred to computing module (16) by the AD acquisition module (15), is distinguished and is moistened using the computing module (16)
Metal worn particle and bubble in lubricating oil conveyance conduit (5), and calculate the size of metal worn particle；The computing module (16) will count
It calculates result to be transferred to host computer (17), the host computer (17) counts metal worn particle according to calculated result.
2. the lubricant oil metal wear particle detection device of bubble can be distinguished according to claim 1, which is characterized in that described first
It motivates solenoid (10), the second excitation solenoid (8) and incudes solenoid (9) along the three solenoid sensor (11)
Axial location is placed；First excitation solenoid (10) and second motivates the number of turns of solenoid (8) identical and around to opposite, line
It is identical to enclose axial length, connects after first excitation solenoid (10) and second excitation solenoid (8) indirect current and to incude spiral shell
Spool is symmetrically placed centered on (9).
3. the lubricant oil metal wear particle detection device of bubble can be distinguished according to claim 1, which is characterized in that the capacitor
Protective layer (2) and the capacitor negative electrode (3) are centered around on the outer surface of the lubricating oil transmission pipeline (5), and the capacitor is protected
Sheath (2) is equipped with a square hole axially arranged along the lubricating oil transmission pipeline (5), and the square hole is in the lubricating oil transfer tube
The axial length in road (5) is equal to the length L of the capacitor positive electrode (1), and the capacitor positive electrode is inlaid in the square hole.
4. a kind of lubricant oil metal wear particle detection method that can distinguish bubble, it is characterised in that: using as described in claim 1
It can distinguish the lubricant oil metal wear particle detection device of bubble, and the following steps are included:
The induction solenoid (9) of the three solenoid sensor (11) is connected with the first signal conditioning module (14), this first
Signal conditioning module (14) detection it is described induction solenoid (9) induced electromotive force, and be converted into voltage signal export to
AD acquisition module (15)；
The capacitance sensor (4) is connected by triaxial cable (12) with second signal conditioning module (13), second signal
Conditioning module (13) detects the capacitance of the capacitance sensor (4), meanwhile, capacitance is converted into voltage signal and is exported to institute
State AD acquisition module (15)；
Collection result is transferred to computing module (16) by the AD acquisition module (15)；
The computing module (16) passes through the capacitance variations of detection capacitance sensor (4), and in conjunction with the three solenoid sensor
(11) inductance variation, distinguishes the metal worn particle and bubble in lubricating oil transmission pipeline (5), and calculate the big of metal worn particle
It is small；
Calculated result is transferred to the host computer (17) by the computing module (16), and the host computer (17) is according to calculated result
Metal worn particle is counted.
5. the lubricant oil metal wear particle detection method of bubble can be distinguished according to claim 4, it is characterised in that:
When metal worn particle enters in the first excitation solenoid (10) or the second excitation solenoid (8), it is assumed that metal worn particle is
Standard is spherical, and first excitation solenoid (10) and second motivates the number of turns of solenoid (8) identical and around to opposite, coil axis
Length is identical, the inductance variable quantity of first excitation solenoid (10) or the second excitation solenoid (8) are as follows:
Wherein, μ1For the relative permeability of metal worn particle, rdFor metal worn particle radius, N1For the first excitation solenoid (10) or the
Two excitation solenoid (8) coil turns, l1For the coil axial length of the first excitation solenoid (10) or the second excitation solenoid (8), μ0
For space permeability；Inductance change rate are as follows:
Wherein, LcFor the former inductance of induction solenoid (9), L'cFor the inductance after induction solenoid (9) variation；
If metal worn particle is feeromagnetic metal abrasive grain, the amplitude of described induction solenoid (9) output signal and the size of metal worn particle
Size is directly proportional, incudes the amplitude V of solenoid (9) output signalL, VLExpression formula are as follows:
In formula, M, B are constant, and then pass through measurement VLSize, the size of ferromagnetic grain can be measured；
If metal worn particle is non-ferromagnetic metal abrasive grain, the induced electromotive force expression formula of induction solenoid (9) are as follows:
Wherein, K is constant, and v is lubricating oil flow velocity；μ1For the relative permeability of metal worn particle, rdFor metal worn particle radius.
6. the lubricant oil metal wear particle detection method of bubble can be distinguished according to claim 5, it is characterised in that: the calculating
Module (16) distinguishes the metal worn particle and bubble in lubricating oil transmission pipeline (5), and calculates the specific mistake of metal worn particle size
Journey is as follows:
If capacitance sensor (4) capacitance reduces, there is bubble to pass through in lubricating oil transmission pipeline (5)；
If capacitance sensor (4) capacitance increases, and the output signal first increases and then decreases of the three solenoid sensor (11),
Then there is metal worn particle to pass through in lubricating oil transmission pipeline (5), and the metal worn particle is feeromagnetic metal abrasive grain, according to formula (1)
Calculate the diameter of the metal worn particle；
If capacitance sensor (4) capacitance increases, and the output signal of the three solenoid sensor (11) first reduces and increases afterwards,
Then there is metal worn particle to pass through in lubricating oil transmission pipeline (5), and the metal worn particle is non-ferromagnetic metal abrasive grain, according to formula
(2) diameter of the metal worn particle is calculated.
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