CN103163183A - Method for detecting content of iron or water in lubricating oil - Google Patents
Method for detecting content of iron or water in lubricating oil Download PDFInfo
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- CN103163183A CN103163183A CN2013100798623A CN201310079862A CN103163183A CN 103163183 A CN103163183 A CN 103163183A CN 2013100798623 A CN2013100798623 A CN 2013100798623A CN 201310079862 A CN201310079862 A CN 201310079862A CN 103163183 A CN103163183 A CN 103163183A
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Abstract
The invention discloses a method for detecting the content of iron or water in lubricating oil, which aims to solve the problems of a conventional method for detecting the content of iron or water in lubricating oil that the influence of human factors is large, the analysis speed is low, devices are expensive, the test cost is high, the detection accuracy is not high and the like. According to the method, excitation current with set frequency and intensity is adopted for testing a lubricating oil resistance value, and the content of the iron or the water in the lubricating oil can be calculated by virtue of a cubic equation, namely y=a-a1x+a2x<2>-a3x<3>, wherein y represents the content of the iron or the water in the lubricating oil and has the unit of percent, x represents the lubricating oil resistance value and has the unit of Omega, and a, a1, a2, and a3 represent factors. The method has the beneficial effects that a device which is low in cost can be adopted for detecting the content of the iron or the water in the lubricating oil, the measuring speed is high, the operation is simple and convenient, the measurement result is accurate and reliable, and the repeatability is good.
Description
Technical field
The present invention relates to the detection technique of iron in a kind of lubricating oil or liquid water content, 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 that lubricating oil is placed in sealing or the circulation system when it uses, and the axle of gear train or gear, gear etc. are lubricated.Because the gear train of mechanical hook-up or gear axis or gear all can be worn; particulate by iron or metal axle or gear wear can be suspended in lubricating oil; be that mechanical impurity in lubricating oil will increase, especially the content of iron or metal can increase.At this moment, not only the lubricant effect of lubricating oil can reduce rapidly, and the particulate that is suspended in lubricating oil also can form the hard polishing particles, and gear train or gear are caused very adverse influence.In addition, in storage, transportation and the use procedure of lubricating oil, airborne water or chilled water etc. all may be blended in lubricating oil, may cause that additive losses in lubricating oil, oil ageing, lubricating oil film thickness reduce and microbial growth etc., also may cause corrosion to the mechanical part corrosion.Therefore, when in lubricating oil, iron content or liquid water content surpass certain value, all can produce very adverse influence.In standard GB/T/T260, detailed index has been formulated in the replacing of lubricating oil, wherein, iron and the water content in lubricating oil is an important index.
in prior art lubricating oil, the iron content detection method mainly comprises online ferrograph, spectrographic method and electrical method etc. are several, wherein, the on-line ferrograph instrument is the fluid detection technique of utilizing magnetic gradient with gravity gradient, metal worn particle to be separated from lubricating oil and arranging by size, the method can be judged size and the character type of wear particle in fluid, but, quantitatively the iron spectrum has its inaccuracy, Debris Analysis mainly relies on operator's know-how and practical experience, the human factor impact of judgement is larger, sample not representative, making the iron spectrum also need be 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, good reproducibility, but this spectrometer general device is expensive, mounting condition is strict, and experimental expenses is high, and the 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, the liquid water content detection method comprises that mainly lab analysis method, spectroscopic analysis methods and electrical method etc. are several, wherein, wherein lab analysis method mainly contains gravimetric method, the way of distillation and karl Fischer method, although it is more extensive that the method is used, but it measures complex procedures, time-consuming, exists that testing result is inaccurate, expense is higher and be not suitable for the defectives such as on-line measurement; Spectroscopic analysis methods comprises atomic emission spectrometry, atomic absorption spectrography (AAS), Infrared spectroscopy and x ray fluorescence spectrometry, do not need the advantages such as pre-service, accuracy of reading and good reproducibility although have fluid, exist 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.Obviously, in prior art lubricating oil, to exist human factor impact larger for iron and liquid water content detection method, and analysis speed is lower, apparatus expensive, the problem such as the high and accuracy of detection of experimental expenses is not high.
Summary of the invention
The human factor impact that exists for iron and liquid water content detection method in solution prior art lubricating oil is larger, analysis speed is lower, apparatus expensive, the problem such as the high and accuracy of detection of experimental expenses is not high, the present invention proposes the detection method of iron in a kind of lubricating oil or liquid water content.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 that the lubricating oil resistance value is measured, and adopts cubic equation y=a-a
1x+a
2x
2-a
3x
3Calculate the content of iron in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring temperature is 20 ℃ to 25 ℃, and measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm, and potential electrode is diameter 38.0mm disk, and the potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the 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 pack in measuring vessel, measuring vessel is placed on ultrasonic oscillator mixes more than 10 minutes, make iron granules be suspended in uniformly in lubricating oil; Described measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm;
S2, settle potential electrode in lubricating oil, the 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 the lubricating oil resistance value, and measuring temperature is 20 ℃ to 25 ℃; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection 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 in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the 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 is to adopt lower-cost equipment that the iron in lubricating oil or liquid water content are detected, and measuring speed is fast, and is simple, convenient, and measurement result is accurate, reliable, good reproducibility.
Description of drawings
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 that exciting current intensity is to the influence curve of different iron content lubricating oil resistance values;
Fig. 3 is that exciting current intensity is to the influence curve of different liquid water content lubricating oil resistance values;
Fig. 4 is that setpoint frequency is to the influence curve of different iron content lubricating oil resistance values;
Fig. 5 is that setpoint frequency is to the influence curve of different liquid water content lubricating oil resistance values;
Fig. 6 is three relation curves between lubricating oil resistance value and iron content concentration.
Be described further below in conjunction with embodiment and the accompanying drawing detection method to iron or liquid water content in lubricating oil of the present invention.
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 that the lubricating oil resistance value is measured, and adopts cubic equation y=a-a
1x+a
2x
2-a
3x
3Calculate the content of iron in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring temperature is 20 ℃ to 25 ℃, and measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm, and potential electrode is diameter 38.0mm disk, and the potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the 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 pack in measuring vessel, measuring vessel is placed on ultrasonic oscillator mixes more than 10 minutes, make iron granules be suspended in uniformly in lubricating oil; Described measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm;
S2, settle potential electrode in lubricating oil, the 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 the lubricating oil resistance value, and measuring temperature is 20 ℃ to 25 ℃; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection 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 in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the lubricating oil resistance value, unit is Ω.
For the feasibility of the detection method of iron or liquid water content in explanation lubricating oil of the present invention, at first, exciting current intensity is studied the impact of different iron or liquid water content lubricating oil resistance value.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%.After fully stirring and mixing, be under the condition of 1KHz and 10KHz at setpoint frequency respectively, from 0 to the 20mA different exciting current intensity of employing, the resistance value of sample measured, measurement result is as shown in accompanying drawing 2 and accompanying drawing 3.Curve in accompanying drawing 2 is corresponding to iron content is respectively 0.025%, 1.0% and 2.0% successively from top to bottom, the curve in accompanying drawing 3 from top to bottom successively correspondence be respectively 0.1%, 1.25% and 2.5% for liquid water content.Can be found out by accompanying drawing 2 and accompanying drawing 3, although the content of the iron in sample or water is different, during greater than 1mA, the fluctuation of lubricating oil resistance value is less in exciting current intensity.And exciting current is larger, and the resistance value fluctuation is less.Both when exciting current was enough large, the resistance value that detects was essentially a definite value.Illustrate when exciting current during greater than 1mA, no matter in lubricating oil, the content of iron or water how, its resistance value can measure a definite value.Above-mentioned detection is to be the cylindrical of diameter 38.0mm, high 50.0mm at measuring vessel; The 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; Measure temperature and be under the condition of 20 ℃ to 25 ℃ and carry out.
Under same experiment condition, adopting said sample is under the condition of 20mA in exciting current intensity, adopt the different set frequency that the resistance value of iron content candidate oil is measured from 2KHz to 10KHz, adopt the different set frequency that the resistance value of lubricating oil containing water sample is measured from 5KHz to 10KHz, measurement result is as shown in accompanying drawing 4 and accompanying drawing 5.Curve in accompanying drawing 4 is corresponding to iron content is respectively 0.025%, 1.0% and 2.0% successively from top to bottom, the curve in accompanying drawing 5 from top to bottom successively correspondence be respectively 0.1%, 1.25% and 2.5% for liquid water content.Can be found out by accompanying drawing 4 and accompanying drawing 5, although the resistance value of each sample all reduces with the increase of frequency in the frequency range that experiment is adopted, the resistance value of sample and its iron or liquid water content have correlativity preferably.As seen, during iron content in detecting lubricating oil, be that the exciting current of 1mA-20mA is measured the resistance value of iron content candidate oil but proportion is 2kHz to 10kHz, strength of current; During liquid water content in detecting lubricating oil, be that the exciting current of 1mA-20mA is measured the resistance value of lubricating oil containing water sample but proportion is 5kHz to 10kHz, strength of current.
In addition, the said determination result shows that also the resistance value of the lubricating oil of different iron or liquid water content all reduces with the frequency increase, and significant difference between them.Therefore, can determine relation between iron in lubricating oil or liquid water content and resistance value.Owing at 2kHz iron content and resistance value in the 10kHz frequency range, good correlativity being arranged, can choose any one frequency in said frequencies and analyze relation between lubricating oil resistance value and iron or liquid water content as the characteristic frequency value.The selection frequency is that 4910.0Hz, strength of current are that the exciting current of 20mA detects, and sets up the mathematical model of lubricating oil impedance and iron content concentration relationship, presents the cubic curve relation between resistance value and iron content concentration, therefore adopts Cubic Curve Fitting.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, the % of unit, horizontal ordinate are lubricating oil resistance value x
1, unit is Ω.Thus, when the exciting current that can obtain proportion and be 4910.0Hz, strength of current and be 20mA detects, 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω.
In like manner, when the exciting current that can obtain proportion and be 10494.0Hz, strength of current and be 20mA detects, 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
2Be the liquid water content value, unit is %, x
2Be the lubricating oil resistance value, unit is Ω.
As previously mentioned, when the iron content in detection lubricating oil, frequency is in 2kHz to 10kHz scope, and the resistance value of iron content candidate oil and its iron content have correlativity preferably; When the liquid water content in detection lubricating oil, frequency is in 5kHz to 10kHz scope, and the resistance value of lubricating oil containing water sample and its liquid water content have correlativity preferably.Therefore, can adopt cubic equation y=a-a
1x+a
2x
2-a
3x
3Calculate the content of iron in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient.
Specific embodiment 1
For the detection method of iron content in checking lubricating oil of the present invention 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, adopt detection method of the present invention that the resistance value of said sample is detected, 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% | ? |
By the result shown in table 1 as can be known, the iron content that adds when adopting the actual detection of the detection method of iron content in lubricating oil of the present invention to obtain iron content and make sample, namely theoretical iron content is basic identical, and, have less error range.
Specific embodiment 2
Adopting and the essentially identical testing conditions of specific embodiment 1, is only 1.91kHz with setpoint frequency, and 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% | ? |
By the result shown in table 2 as can be known, the iron content that adds when adopting the actual detection of the detection method of iron content in lubricating oil of the present invention to obtain iron content and make sample, namely theoretical iron content is basic identical, and, have less error range.Setpoint frequency is lower value in this embodiment, and exciting current is high value.
Adopting and the essentially identical testing conditions of specific embodiment 1, is only 9.2kHz with setpoint frequency, and 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% | ? |
By the result shown in table 3 as can be known, although change has occured for setpoint frequency and exciting current, adopt the detection method of iron content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, less error range had.Setpoint frequency is high value in this embodiment, and exciting current is lower value.
Specific embodiment 4
Adopting and the essentially identical testing conditions of specific embodiment 1, is only 4.82kHz with setpoint frequency, and 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% | ? |
By the result shown in table 4 as can be known, although change has occured for setpoint frequency and exciting current, adopt the detection method of iron content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, less error range had.Setpoint frequency and exciting current are intermediate value in this embodiment.
Specific embodiment 5
For the detection method of liquid water content in checking lubricating oil of the present invention 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 detection method of the present invention that the resistance value of said sample is detected, 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% | ? |
By the result shown in table 5 as can be known, the liquid water content that adds when adopting the actual detection of the detection method of liquid water content in lubricating oil of the present invention to obtain liquid water content and make sample, namely theoretical water content is basic identical, and, have less error range.
Specific embodiment 6
Adopting and the essentially identical testing conditions of specific embodiment 5, is only 5.165kHz with setpoint frequency, and 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% | ? |
By the result shown in table 6 as can be known, the liquid water content that adds when adopting the actual detection of the detection method of liquid water content in lubricating oil of the present invention to obtain liquid water content and make sample, namely theoretical water content is basic identical, and, have less error range.Setpoint frequency is lower value in this embodiment, and exciting current is high value.
Specific embodiment 7
Adopting and the essentially identical testing conditions of specific embodiment 5, is only 8.146kHz with setpoint frequency, and 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% | ? |
By the result shown in table 7 as can be known, although change has occured for setpoint frequency and exciting current, adopt the detection method of liquid water content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, less error range had.Setpoint frequency is high value in this embodiment, and exciting current is lower value.
Specific embodiment 8
Adopting and the essentially identical testing conditions of specific embodiment 5, is only 4.82kHz with setpoint frequency, and 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% | ? |
By the result shown in table 8 as can be known, although change has occured for setpoint frequency and exciting current, adopt the detection method of liquid water content in lubricating oil of the present invention still can obtain testing result comparatively accurately, and, less error range had.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 is simple, convenient, and measurement result is accurate, reliable, good reproducibility.
Claims (2)
1. the detection method of iron or liquid water content in a lubricating oil, is characterized in that: adopt the exciting current of setpoint frequency and intensity that the lubricating oil resistance value is measured, adopt cubic equation y=a-a
1x+a
2x
2-a
3x
3Calculate the content of iron in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection lubricating oil, described setpoint frequency is 5kHz to 10kHz, and described exciting current intensity is 1mA-20mA; Measuring temperature is 20 ℃ to 25 ℃, and measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm, and potential electrode is diameter 38.0mm disk, and the potential electrode symmetry is placed on the geometric center of container, and the spacing of potential electrode is 3.0mm; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the lubricating oil resistance value, unit is Ω.
2. the detection method of iron or liquid water content in lubricating oil according to claim 1, it is characterized in that: the method comprises the following steps:
S1, get lubricating oil to be detected and pack in measuring vessel, measuring vessel is placed on ultrasonic oscillator mixes more than 10 minutes, make iron granules be suspended in uniformly in lubricating oil; Described measuring vessel is the cylindrical of diameter 38.0mm, high 50.0mm;
S2, settle potential electrode in lubricating oil, the 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 the lubricating oil resistance value, and measuring temperature is 20 ℃ to 25 ℃; When the iron content in detection lubricating oil, described setpoint frequency is 2kHz to 10kHz, and described exciting current intensity is 1mA-20mA; When the liquid water content in detection 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 in lubricating oil or water, in formula, y is the content of iron or water in lubricating oil, and the % of unit, x are the lubricating oil resistance value, and unit is Ω, a, a
1, a
2, a
3Be coefficient; Wherein,
When proportion is that 4910.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
1Be the iron content value, unit is %, x
1Be the lubricating oil resistance value, unit is Ω;
When proportion is that 10494.0Hz, strength of current are the exciting current of 20mA when measuring the resistance value of lubricating oil, adopt following formula 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
2Be the liquid water content value, unit is %, x
2Be the lubricating oil resistance value, unit is Ω.
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| CN104535658A (en) * | 2014-12-17 | 2015-04-22 | 中国神华能源股份有限公司 | Sound detection-based device and method for testing moisture of lubricating oil |
| EP2910933A1 (en) * | 2014-02-25 | 2015-08-26 | CM Technologies GmbH | Method for determining the total iron content in a sample of a liquid lubricating oil |
| 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 |
| CN112031893A (en) * | 2020-08-31 | 2020-12-04 | 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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| EP2910933A1 (en) * | 2014-02-25 | 2015-08-26 | CM Technologies GmbH | Method for determining the total iron content in a sample of a liquid lubricating oil |
| EP2924418A1 (en) * | 2014-02-25 | 2015-09-30 | CM Technologies GmbH | Method for determining the total iron content in a sample of a liquid lubricating oil |
| CN104165820A (en) * | 2014-08-19 | 2014-11-26 | 北京华安广通科技发展有限公司 | Sensor for detecting content of ferrum powder in lubricating oil and detecting method |
| CN104535658A (en) * | 2014-12-17 | 2015-04-22 | 中国神华能源股份有限公司 | Sound detection-based device and method for testing moisture of lubricating oil |
| 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 |
| CN112031893A (en) * | 2020-08-31 | 2020-12-04 | 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 |
| 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 |
| CN117109906A (en) * | 2023-10-24 | 2023-11-24 | 卡松科技股份有限公司 | Oil online equipment fault analysis method and system based on visualization |
| CN117109906B (en) * | 2023-10-24 | 2024-01-30 | 卡松科技股份有限公司 | Oil online equipment fault analysis method and system based on visualization |
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