CN103163183B - The detection method of iron or liquid water content in a kind of lubricating oil - Google Patents
The detection method of iron or liquid water content in a kind of lubricating oil Download PDFInfo
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- CN103163183B CN103163183B CN201310079862.3A CN201310079862A CN103163183B CN 103163183 B CN103163183 B CN 103163183B CN 201310079862 A CN201310079862 A CN 201310079862A CN 103163183 B CN103163183 B CN 103163183B
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Abstract
Affect larger for solving the human factor that in prior art lubricating oil, iron and liquid water content detection method exist, analysis speed is lower, apparatus expensive, the problems such as the high and accuracy of detection of experimental expenses is not high, the present invention proposes the detection method of iron or liquid water content in a kind of lubricating oil, adopt the exciting current of setpoint frequency and intensity to measure lubricating oil resistance value, adopt cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient.In lubricating oil of the present invention, the beneficial effect of the detection method of iron or liquid water content adopts lower-cost equipment to detect the iron in lubricating oil or liquid water content, and measuring speed is fast, and simple, convenient, measurement result is accurate, reliable, reproducible.
Description
Technical field
The present invention relates to the detection technique of iron or liquid water content in a kind of lubricating oil, particularly the detection method of iron or liquid water content in a kind of lubricating oil.
Background technology
Usually, the gear train of mechanical hook-up or gear all adopt lubricating oil as lubricant, are all to be placed in by lubricating oil to close or the circulation system when it uses, and lubricate the axle, gear etc. of gear train or gear.Because the gear train of mechanical hook-up or gear axis or gear all can be worn; can be suspended in lubricating oil by the particulate of iron or metal axle or gear wear; namely the mechanical impurity in lubricating oil will increase, and especially the content of iron or metal can increase.Now, not only the lubricant effect of lubricating oil can reduce rapidly, and the particulate be suspended in lubricating oil also can form abrasive hardcoat particle, causes very adverse influence to gear train or gear.In addition, in the storage of lubricating oil, transport and use procedure, water in air or chilled water etc. all may be mixed in lubricating oil, additive losses in lubricating oil, oil ageing, the reduction of lubricating oil film thickness and microbial growth etc. may be caused, also may cause corrosion to mechanical part corrosion.Therefore, when iron content or liquid water content exceed certain value in lubricating oil, all very adverse influence can be produced.Formulated detailed index to the replacing of lubricating oil in standard GB/T/T260, wherein, iron and the water content in lubricating oil is an important index.
In prior art lubricating oil, iron content detection method mainly comprises online ferrograph, spectrographic method and electrical method etc. are several, wherein, on-line ferrograph instrument utilizes magnetic gradient and gravity gradient to be separated from lubricating oil by metal worn particle and the oil liquid detection technology arranged by size, the method can judge size and the character type of wear particle in fluid, but, quantitative iron spectrum has its inaccuracy, Debris Analysis mainly relies on know-how and the practical experience of operator, the human factor impact judged is larger, sample not representative, making iron spectrum also needs with for a long time, analysis speed is lower, spectroscopic analysis methods comprises atomic emission spectrometry, atomic absorption spectrography (AAS), Infrared spectroscopy and x ray fluorescence spectrometry, general fluid does not need pre-service, accuracy of reading, reproducible, but this spectrometer general device is expensive, mounting condition is strict, and experimental expenses is high, and production scene is difficult to promote, the monitoring of electrical method has conductivity and capacitance method, and these two kinds of measuring method accuracy of detection are not very high.In prior art lubricating oil, mainly to comprise laboratory analysis methodologies, spectroscopic analysis methods and electrical method etc. several for liquid water content detection method, wherein, wherein laboratory analysis methodologies mainly contains gravimetric method, the way of distillation and Karl_Fischer method, although the method Application comparison is extensive, but it measures complex procedures, time-consuming, there is testing result inaccurate, costly and be not suitable for the defects such as on-line measurement; Spectroscopic analysis methods comprises atomic emission spectrometry, atomic absorption spectrography (AAS), Infrared spectroscopy and x ray fluorescence spectrometry, although there is fluid do not need pre-service, accuracy of reading and the advantage such as reproducible, there is the shortcomings such as the strict and experimental expenses of apparatus expensive, mounting condition is higher; The monitoring of electrical method has conductivity and capacitance method, and these two kinds of measuring method accuracy of detection are not very high.The problems such as obviously, in prior art lubricating oil, to there is human factor impact comparatively large for iron and liquid water content detection method, and analysis speed is lower, apparatus expensive, and the high and accuracy of detection of experimental expenses is not high.
Summary of the invention
Affect larger for solving the human factor that in prior art lubricating oil, iron and liquid water content detection method exist, analysis speed is lower, apparatus expensive, the problems such as the high and accuracy of detection of experimental expenses is not high, the present invention proposes the detection method of iron or liquid water content in a kind of lubricating oil.In lubricating oil of the present invention, the detection method of iron or liquid water content adopts the exciting current of setpoint frequency and intensity to measure lubricating oil resistance value, adopts cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring tempeature is 20 DEG C to 25 DEG C, measuring vessel be diameter 38.0mm, high 50.0mm cylindrical, potential electrode is diameter 38.0mm disk, and potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
Further, in lubricating oil of the present invention, the detection method of iron or liquid water content comprises the following steps:
S1, get lubricating oil to be detected and load in measuring vessel, measuring vessel is placed on ultrasonic oscillator and mixes more than 10 minutes, iron granules is suspended in lubricating oil uniformly; Described measuring vessel be diameter 38.0mm, high 50.0mm cylindrical;
S2, in lubricating oil, settle potential electrode, potential electrode symmetry is placed on the geometric center of measuring vessel, and potential electrode is diameter 38.0mm disk, and the spacing of potential electrode is 3.0mm;
The exciting current of S3, employing setpoint frequency is tested lubricating oil resistance value, and measuring tempeature is 20 DEG C to 25 DEG C; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA;
S4, employing cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
In lubricating oil of the present invention, the beneficial effect of the detection method of iron or liquid water content adopts lower-cost equipment to detect the iron in lubricating oil or liquid water content, and measuring speed is fast, and simple, convenient, measurement result is accurate, reliable, reproducible.
Accompanying drawing explanation
Fig. 1 is the detecting step schematic diagram of the detection method of iron or liquid water content in lubricating oil of the present invention;
Fig. 2 is the influence curve of exciting current intensity to different iron content lubricating oil resistance value;
Fig. 3 is the influence curve of exciting current intensity to different liquid water content lubricating oil resistance value;
Fig. 4 is the influence curve of setpoint frequency to different iron content lubricating oil resistance value;
Fig. 5 is the influence curve of setpoint frequency to different liquid water content lubricating oil resistance value;
Fig. 6 is three relation curves between lubricating oil resistance value and iron content concentration.
Below in conjunction with embodiment and accompanying drawing, the detection method of iron or liquid water content in lubricating oil of the present invention is described further.
Embodiment
Fig. 1 is the detecting step schematic diagram of the detection method of iron content in lubricating oil of the present invention, as seen from the figure, in lubricating oil of the present invention, the detection method of iron or liquid water content adopts the exciting current of setpoint frequency and intensity to measure lubricating oil resistance value, adopts cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring tempeature is 20 DEG C to 25 DEG C, measuring vessel be diameter 38.0mm, high 50.0mm cylindrical, potential electrode is diameter 38.0mm disk, and potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
Further, in lubricating oil of the present invention, the detection method of iron or liquid water content comprises the following steps:
S1, get lubricating oil to be detected and load in measuring vessel, measuring vessel is placed on ultrasonic oscillator and mixes more than 10 minutes, iron granules is suspended in lubricating oil uniformly; Described measuring vessel be diameter 38.0mm, high 50.0mm cylindrical;
S2, in lubricating oil, settle potential electrode, potential electrode symmetry is placed on the geometric center of measuring vessel, and potential electrode is diameter 38.0mm disk, and the spacing of potential electrode is 3.0mm;
The exciting current of S3, employing setpoint frequency is tested lubricating oil resistance value, and measuring tempeature is 20 DEG C to 25 DEG C; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA;
S4, employing cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
For the feasibility of the detection method of iron or liquid water content in lubricating oil of the present invention is described, first, the impact of exciting current intensity on different iron or liquid water content lubricating oil resistance value is studied.Adopt the sample of artificial preparation iron content or water lubrication oil, its iron content is respectively 0.025%, 1.0% and 2.0%, and its liquid water content is respectively 0.1%, 1.25% and 2.5%.Abundant stirring and after mixing, be under the condition of 1KHz and 10KHz respectively at setpoint frequency, adopt the different resistance value of exciting current intensity to sample to measure from 0 to 20mA, measurement result is as shown in accompanying drawing 2 and accompanying drawing 3.What the curve in accompanying drawing 2 was corresponding in turn to from top to bottom is respectively 0.025%, 1.0% and 2.0% for iron content, and what the curve in accompanying drawing 3 was corresponding in turn to from top to bottom is respectively 0.1%, 1.25% and 2.5% for liquid water content.As can be seen from accompanying drawing 2 and accompanying drawing 3, although the content of the iron in sample or water is different, when exciting current intensity is greater than 1mA, the fluctuation of lubricating oil resistance value is less.Further, exciting current is larger, and resistance value fluctuation is less.Both, when exciting current is enough large, the resistance value detected had been essentially a definite value.Illustrate when exciting current is greater than 1mA, no matter the content of iron or water in lubricating oil, its resistance value can measure a definite value.Above-mentioned detection be measuring vessel be diameter 38.0mm, high 50.0mm cylindrical; Potential electrode symmetry is placed on the geometric center of measuring vessel, and potential electrode is diameter 38.0mm disk, and the spacing of potential electrode is 3.0mm; Measuring tempeature is carry out under the condition of 20 DEG C to 25 DEG C.
Under same experiment condition, said sample is adopted to be under the condition of 20mA in exciting current intensity, adopt the resistance value of different set frequency to iron content candidate oil to measure from 2KHz to 10KHz, adopt the resistance value of different set frequency to lubricating oil containing water sample to measure from 5KHz to 10KHz, measurement result as shown in figures 4 and 5.What the curve in accompanying drawing 4 was corresponding in turn to from top to bottom is respectively 0.025%, 1.0% and 2.0% for iron content, and what the curve in accompanying drawing 5 was corresponding in turn to from top to bottom is respectively 0.1%, 1.25% and 2.5% for liquid water content.As can be seen from accompanying drawing 4 and accompanying drawing 5, although all reduce with the increase of frequency at the resistance value of testing each sample in the frequency range that adopts, the resistance value of sample and its iron or liquid water content have good correlativity.Visible, when detecting the iron content in lubricating oil, the resistance value of exciting current to iron content candidate oil that frequency is 2kHz to 10kHz, strength of current is 1mA-20mA can be adopted to measure; When detecting the liquid water content in lubricating oil, the resistance value of exciting current to lubricating oil containing water sample that frequency is 5kHz to 10kHz, strength of current is 1mA-20mA can be adopted to measure.
In addition, said determination result also shows that the resistance value of the lubricating oil of different iron or liquid water content all increases with frequency and reduces, and significant difference between them.Therefore, iron or the relation between liquid water content and resistance value in lubricating oil can be determined.Because iron content and resistance value have good correlativity in 2kHz to 10kHz frequency range, any one frequency in said frequencies can be chosen as characteristic frequency value to analyze the relation between lubricating oil resistance value and iron or liquid water content.The exciting current that selection frequency is 4910.0Hz, strength of current is 20mA detects, and sets up the mathematical model of lubricating oil impedance and iron content concentration relationship, presents cubic curve relation, therefore adopt Cubic Curve Fitting between resistance value and iron content concentration.Accompanying drawing 6 is three relation curves between lubricating oil resistance value and iron content concentration, and in figure, ordinate is the iron content y in lubricating oil
1, unit %, horizontal ordinate is lubricating oil resistance value x
1, unit is Ω.Thus, can obtain adopting that frequency is 4910.0Hz, strength of current is the exciting current of 20mA when detecting, the cubic equation relation between lubricating oil resistance value and iron content concentration:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω.
In like manner, can obtain adopting that frequency is 10494.0Hz, strength of current is the exciting current of 20mA when detecting, the cubic equation relation between lubricating oil resistance value and liquid water content concentration:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
As previously mentioned, when detecting the iron content in lubricating oil, frequency is in 2kHz to 10kHz scope, and resistance value and its iron content of iron content candidate oil have good correlativity; When detecting the liquid water content in lubricating oil, frequency is in 5kHz to 10kHz scope, and resistance value and its liquid water content of lubricating oil containing water sample have good correlativity.Therefore, cubic equation y=a-a can be adopted
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient.
Specific embodiment 1
For iron content in checking lubricating oil of the present invention detection method accuracy and reliability, adopt the sample of artificial preparation iron content lubricating oil, its iron content is respectively 0.15%, 0.5%, 0.75%, 1% and 2%, after stirring, the resistance value of detection method to said sample is adopted to detect, and calculate detection iron content value, wherein, setpoint frequency is 4910.0Hz, exciting current is 20mA, and its testing result is as shown in table 1 below.
Table 1: the testing result of test specimen under 4910.0Hz, 20mA condition
| 1 | 2 | 3 | 4 | 5 | Remarks | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detect iron content | 0.141% | 0.493% | 0.734% | 0.971% | 1.935% |
Result is as shown in Table 1 known, and adopt the actual detection of the detection method of iron content in lubricating oil of the present invention to obtain iron content and the iron content added when making sample, namely theoretical iron content is substantially identical, and, there is less error range.
Specific embodiment 2
Adopt the testing conditions substantially identical with specific embodiment 1, be only 1.91kHz by setpoint frequency, exciting current is 20mA, and its testing result is as shown in table 2 below.
Table 2: the testing result of test specimen under 1.91kHz, 20mA condition
| 1 | 2 | 3 | 4 | 5 | Remarks | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detect iron content | 0.131% | 0.473% | 0.725% | 0.912% | 1.867% |
Result is as shown in Table 2 known, and adopt the actual detection of the detection method of iron content in lubricating oil of the present invention to obtain iron content and the iron content added when making sample, namely theoretical iron content is substantially identical, and, there is less error range.Setpoint frequency is lower value in this embodiment, and exciting current is high value.
Specific embodiment 3
Adopt the testing conditions substantially identical with specific embodiment 1, be only 9.2kHz by setpoint frequency, exciting current is 2mA, and its testing result is as shown in table 3 below.
Table 3: the testing result of test specimen under 9.2kHz, 2mA condition
| 1 | 2 | 3 | 4 | 5 | Remarks | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detect iron content | 0.134% | 0.475% | 0.732% | 0.946% | 1.923% |
Result is as shown in Table 3 known, although setpoint frequency and exciting current there occurs change, adopts the detection method of iron content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, there is less error range.Setpoint frequency is high value in this embodiment, and exciting current is lower value.
Specific embodiment 4
Adopt the testing conditions substantially identical with specific embodiment 1, be only 4.82kHz by setpoint frequency, exciting current is 9.5mA, and its testing result is as shown in table 4 below.
Table 4: the testing result of test specimen under 4.82kHz, 9.5mA condition
| 1 | 2 | 3 | 4 | 5 | Remarks | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detect iron content | 0.138% | 0.478% | 0.736% | 0.96% | 1.95% |
Result is as shown in Table 4 known, although setpoint frequency and exciting current there occurs change, adopts the detection method of iron content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, there is less error range.Setpoint frequency and exciting current are intermediate value in this embodiment.
Specific embodiment 5
For liquid water content in checking lubricating oil of the present invention detection method accuracy and reliability, adopt the sample of artificial preparation lubricating oil containing water, its liquid water content is respectively 0.1%, 0.2%, 0.5%, 0.75%, 1.25%, 2.5%, 5%, after stirring, adopt the resistance value of detection method to said sample to detect, and calculate detection liquid water content value, wherein, setpoint frequency is 10494.0Hz, and exciting current is 20mA, and its testing result is as shown in table 4 below.
Table 5: the testing result of test specimen under 10494.0Hz, 20mA condition
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detect liquid water content | 0.108% | 0.231% | 0.523% | 0.761% | 1.231% | 2.403% | 5.012% |
Result is as shown in Table 5 known, and adopt the actual detection of the detection method of liquid water content in lubricating oil of the present invention to obtain liquid water content and the liquid water content added when making sample, namely theoretical water content is substantially identical, and, there is less error range.
Specific embodiment 6
Adopt the testing conditions substantially identical with specific embodiment 5, be only 5.165kHz by setpoint frequency, exciting current is 2mA, and its testing result is as shown in table 6 below.
Table 6: the testing result of test specimen under 5.165kHz, 20mA condition
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detect liquid water content | 0.119% | 0.250% | 0.547% | 0.786% | 1.319% | 2.243% | 5.032% |
Result is as shown in Table 6 known, and adopt the actual detection of the detection method of liquid water content in lubricating oil of the present invention to obtain liquid water content and the liquid water content added when making sample, namely theoretical water content is substantially identical, and, there is less error range.Setpoint frequency is lower value in this embodiment, and exciting current is high value.
Specific embodiment 7
Adopt the testing conditions substantially identical with specific embodiment 5, be only 8.146kHz by setpoint frequency, exciting current is 2mA, and its testing result is as shown in table 7 below.
Table 7: the testing result of test specimen under 8.146kHz, 2mA condition
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detect liquid water content | 0.149% | 0.284% | 0.570% | 0.717% | 1.953% | 2.203% | 5.066% |
Result is as shown in Table 7 known, although setpoint frequency and exciting current there occurs change, adopts the detection method of liquid water content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, there is less error range.Setpoint frequency is high value in this embodiment, and exciting current is lower value.
Specific embodiment 8
Adopt the testing conditions substantially identical with specific embodiment 5, be only 4.82kHz by setpoint frequency, exciting current is 9.5mA, and its testing result is as shown in table 8 below.
Table 8: the testing result of test specimen under 10494kHz, 9.5mA condition
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detect liquid water content | 0.110% | 0.264% | 0.407% | 0.744% | 1.804% | 2.264% | 5.017% |
Result is as shown in Table 8 known, although setpoint frequency and exciting current there occurs change, adopts the detection method of liquid water content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, there is less error range.Setpoint frequency and exciting current are intermediate value in this embodiment.
Obviously, in lubricating oil of the present invention, the beneficial effect of the detection method of iron or liquid water content is that the lower-cost equipment of employing contains the iron in lubricating oil or the water yield detects, and measuring speed is fast, and simple, convenient, measurement result is accurate, reliable, reproducible.
Claims (2)
1. the detection method of iron or liquid water content in lubricating oil, is characterized in that: adopt the exciting current of setpoint frequency and intensity to measure lubricating oil resistance value, adopt cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring tempeature is 20 DEG C to 25 DEG C, measuring vessel be diameter 38.0mm, high 50.0mm cylindrical, potential electrode is diameter 38.0mm disk, and potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
2. the detection method of iron or liquid water content in lubricating oil according to claim 1, is characterized in that: the method comprises the following steps:
S1, get lubricating oil to be detected and load in measuring vessel, measuring vessel is placed on ultrasonic oscillator and mixes more than 10 minutes, iron granules is suspended in lubricating oil uniformly; Described measuring vessel be diameter 38.0mm, high 50.0mm cylindrical;
S2, in lubricating oil, settle potential electrode, potential electrode symmetry is placed on the geometric center of measuring vessel, and potential electrode is diameter 38.0mm disk, and the spacing of potential electrode is 3.0mm;
The exciting current of S3, employing setpoint frequency is tested lubricating oil resistance value, and measuring tempeature is 20 DEG C to 25 DEG C; When detecting the iron content in lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When detecting the liquid water content in lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA;
S4, employing cubic equation y=a-a
1x+a
2x
2-a
3x
3calculate the content of iron or water in lubricating oil, in formula, y is the content of iron or water in lubricating oil, and unit %, x are lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3for coefficient; Wherein,
When adopting frequency is 4910.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate iron content value in lubricating oil:
y
1=75184.6-0.6x
1+1.2×10
-6x
1 2-9.7×10
-13x
1 3
In formula: y
1for iron content value, unit is %, x
1for lubricating oil resistance value, unit is Ω;
When adopting frequency is 10494.0Hz, strength of current is 20mA exciting current to measure the resistance value of lubricating oil, following formula is adopted to calculate liquid water content value in lubricating oil:
y
2=200803.48-10439.04x
2+2452.86x
2 2-219.83x
2 3
In formula: y
2for liquid water content value, unit is %, x
2for lubricating oil resistance value, unit is Ω.
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| CN104535658B (en) * | 2014-12-17 | 2017-06-23 | 中国神华能源股份有限公司 | A kind of lubricating oil moisture content tester and method based on sound detection |
| CN107884315A (en) * | 2017-12-12 | 2018-04-06 | 无锡市飞天油脂有限公司 | A kind of intelligent quality of lubrication oil detection device |
| CN112031893B (en) * | 2020-08-31 | 2021-08-31 | 广州汽车集团股份有限公司 | Method and system for predicting water content of engine lubricating oil, automobile and medium |
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