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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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 232
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 171
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 116
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 238000001514 detection method Methods 0.000 title abstract description 38
- 239000007788 liquid Substances 0.000 title abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000005284 excitation Effects 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 43
- 238000012360 testing method Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 238000010291 electrical method Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000010183 spectrum analysis Methods 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004566 IR spectroscopy Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 2
- 238000001636 atomic emission spectroscopy Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004846 x-ray emission Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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 invention relates to a detection technology of iron or water content in lubricating oil, in particular to a detection method of iron or water content in lubricating oil.
Background
In general, a transmission mechanism or a speed change mechanism of a mechanical device uses lubricating oil as a lubricant, and the lubricating oil is put into a closed or circulating system to lubricate a shaft, a gear, and the like of the transmission mechanism or the speed change mechanism when used. Since the shafts or gears in the transmission or gear change of the mechanical device are worn, the worn particles of the shafts or gears made of iron or metal are suspended in the lubricant, i.e., the lubricant contains an increased amount of mechanical impurities, especially iron or metal. In this case, not only the lubricating effect of the lubricating oil is rapidly reduced, but also fine particles suspended in the lubricating oil form hard abrasive particles, which have a very adverse effect on the structure of the transmission mechanism or the transmission. In addition, during storage, transportation and use of the lubricating oil, water in the air, cooling water and the like may be mixed into the lubricating oil, which may cause loss of additives in the lubricating oil, oxidation of the lubricating oil, reduction in the thickness of a lubricating oil film, growth of microorganisms and the like, and may corrode mechanical parts. Therefore, when the iron content or the water content in the lubricating oil exceeds a certain value, a significant adverse effect is produced. The national standard GB/T260 sets detailed indexes for the replacement of lubricating oil, wherein the content of iron and water in the lubricating oil is an important index.
The method for detecting the iron content in the lubricating oil in the prior art mainly comprises an online ferrograph, a spectral analysis method, an electrical method and the like, wherein the online ferrograph is an oil liquid detection technology for separating metal abrasive particles from the lubricating oil by utilizing a magnetic gradient and a gravity gradient and arranging the metal abrasive particles according to the sizes, the method can judge the sizes and property types of wear particles in the oil liquid, however, the quantitative ferrograph has inaccuracy, the abrasive particle analysis mainly depends on the knowledge level and practical experience of an operator, the judgment human factor has large influence, the sampling is not representative, the ferrograph is required to be made for a long time, and the analysis speed is low; the spectral analysis method comprises an atomic emission spectrometry, an atomic absorption spectrometry, an infrared spectrometry and an X-ray fluorescence spectrometry, and the ordinary oil does not need pretreatment, so that the reading is accurate, the repeatability is good, but the ordinary spectrometer is expensive in equipment, strict in installation conditions, high in experimental cost and difficult to popularize in a production field; the electrical method is used for monitoring by a conductivity method and a capacitance method, and the detection precision of the two measurement methods is not very high. The method for detecting the water content in the lubricating oil in the prior art mainly comprises a laboratory analysis method, a spectral analysis method, an electrical method and the like, wherein the laboratory analysis method mainly comprises a gravimetric method, a distillation method and a Karl Fischer method; the spectral analysis method comprises an atomic emission spectrometry, an atomic absorption spectrometry, an infrared spectrometry and an X-ray fluorescence spectrometry, and has the advantages of no pretreatment of oil, accurate reading, good repeatability and the like, but has the defects of expensive equipment, strict installation conditions, higher experimental cost and the like; the electrical method is used for monitoring by a conductivity method and a capacitance method, and the detection precision of the two measurement methods is not very high. Obviously, the method for detecting the content of iron and water in the lubricating oil in the prior art has the problems of large influence of human factors, low analysis speed, expensive equipment, high experimental cost, low detection precision and the like.
Disclosure of Invention
The invention provides a method for detecting the content of iron or water in lubricating oil, which aims to solve the problems of large influence of human factors, low analysis speed, expensive equipment, high experimental cost, low detection precision and the like in the method for detecting the content of iron and water in lubricating oil in the prior art. The method for detecting the content of iron or water in the lubricating oil measures the impedance value of the lubricating oil by adopting the excitation current with set frequency and intensity and adopting the cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; the measuring temperature is 20-25 ℃, the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0mm, the measuring electrodes are circular sheets with the diameter of 38.0mm, the measuring electrodes are symmetrically arranged at the geometric center of the container, and the distance between the measuring electrodes is 3.0 mm; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
Further, the method for detecting the content of iron or water in the lubricating oil comprises the following steps:
s1, filling lubricating oil to be detected into a measuring container, and placing the measuring container on an ultrasonic oscillator to mix for more than 10 minutes so that iron particles are uniformly suspended in the lubricating oil; the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0 mm;
s2, arranging measuring electrodes in the lubricating oil, wherein the measuring electrodes are symmetrically arranged at the geometric center of the measuring container, the measuring electrodes are round pieces with the diameter of 38.0mm, and the distance between the measuring electrodes is 3.0 mm;
s3, testing the impedance value of the lubricating oil by adopting exciting current with set frequency, wherein the measurement temperature is 20-25 ℃; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA;
s4, using a cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
The method for detecting the content of the iron or the water in the lubricating oil has the advantages that equipment with lower cost is adopted to detect the content of the iron or the water in the lubricating oil, the measuring speed is high, the operation is simple and convenient, the measuring result is accurate and reliable, and the repeatability is good.
Drawings
FIG. 1 is a schematic diagram of the detection steps of the method for detecting the iron or water content in lubricating oil according to the present invention;
FIG. 2 is a graph showing the effect of excitation current intensity on the resistance values of lubricating oils with different iron contents;
FIG. 3 is a graph showing the effect of excitation current intensity on the impedance values of lubricants with different water contents;
FIG. 4 is a graph showing the effect of a set frequency on the impedance of lubricating oils of different iron content;
FIG. 5 is a graph showing the effect of setting frequency on the impedance of a lubricant of different water content;
FIG. 6 is a graph showing the relationship between the lubricating oil resistance value and the concentration of iron content in a cubic manner.
The method for detecting the iron or water content in the lubricating oil according to the present invention will be further described with reference to the following detailed description and the accompanying drawings.
Detailed Description
FIG. 1 is a schematic diagram of the detection steps of the method for detecting the iron content in the lubricating oil according to the present invention, and it can be seen from the diagram that the method for detecting the iron or water content in the lubricating oil according to the present invention uses excitation current with set frequency and intensity to measure the impedance value of the lubricating oil, and uses the cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; the measuring temperature is 20-25 ℃, the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0mm, the measuring electrodes are circular sheets with the diameter of 38.0mm, the measuring electrodes are symmetrically arranged at the geometric center of the container, and the distance between the measuring electrodes is 3.0 mm; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
Further, the method for detecting the content of iron or water in the lubricating oil comprises the following steps:
s1, filling lubricating oil to be detected into a measuring container, and placing the measuring container on an ultrasonic oscillator to mix for more than 10 minutes so that iron particles are uniformly suspended in the lubricating oil; the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0 mm;
s2, arranging measuring electrodes in the lubricating oil, wherein the measuring electrodes are symmetrically arranged at the geometric center of the measuring container, the measuring electrodes are round pieces with the diameter of 38.0mm, and the distance between the measuring electrodes is 3.0 mm;
s3, testing the impedance value of the lubricating oil by adopting exciting current with set frequency, wherein the measurement temperature is 20-25 ℃; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA;
s4, using a cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
To illustrate the feasibility of the method for detecting the iron or water content in the lubricating oil of the present invention, first, the influence of the excitation current intensity on the impedance values of lubricating oils with different iron or water contents was studied. Samples of artificially prepared lubricating oils containing iron or water, with iron contents of 0.025%, 1.0% and 2.0%, respectively, and water contents of 0.1%, 1.25% and 2.5%, respectively, were used. After fully stirring and uniformly mixing, the impedance values of the samples were measured from 0 to 20mA at set frequencies of 1KHz and 10KHz, respectively, using different excitation current intensities, and the measurement results are shown in FIGS. 2 and 3. The curves in fig. 2 correspond in sequence from top to bottom to an iron content of 0.025%, 1.0% and 2.0%, respectively, and the curves in fig. 3 correspond in sequence from top to bottom to a water content of 0.1%, 1.25% and 2.5%, respectively. As can be seen from fig. 2 and 3, although the contents of iron or water in the samples are different from each other, the fluctuation of the impedance value of the lubricating oil is small when the excitation current intensity is larger than 1 mA. And, the larger the excitation current, the smaller the fluctuation of the impedance value. I.e. when the excitation current is sufficiently large, the detected impedance value is substantially constant. It is shown that when the exciting current is larger than 1mA, the impedance value can be measured to be a fixed value regardless of the content of iron or water in the lubricating oil. The detection is that the measuring container is a cylinder with the diameter of 38.0mm and the height of 50.0 mm; the measuring electrodes are symmetrically arranged at the geometric center of the measuring container, the measuring electrodes are circular sheets with the diameter of 38.0mm, and the distance between the measuring electrodes is 3.0 mm; the measurement temperature is 20 ℃ to 25 ℃.
Under the same experimental conditions, the sample is used for measuring the impedance value of the ferrous lubricating oil sample by using different set frequencies from 2KHz to 10KHz under the condition that the excitation current intensity is 20mA, and the impedance value of the water-containing lubricating oil sample is measured by using different set frequencies from 5KHz to 10KHz, and the measurement results are shown in figures 4 and 5. The curves in fig. 4 correspond in sequence from top to bottom to an iron content of 0.025%, 1.0% and 2.0%, respectively, and the curves in fig. 5 correspond in sequence from top to bottom to a water content of 0.1%, 1.25% and 2.5%, respectively. As can be seen from fig. 4 and 5, in the frequency range used in the experiment, although the impedance value of each sample decreases with increasing frequency, the impedance value of the sample has a better correlation with the iron or water content thereof. It can be seen that when detecting the iron content in the lubricating oil, the impedance value of the ferrous lubricating oil sample can be measured by adopting the exciting current with the frequency of 2kHz to 10kHz and the current intensity of 1mA to 20 mA; when the water content in the lubricating oil is detected, the impedance value of the water-containing lubricating oil sample can be measured by using an excitation current with the frequency of 5kHz to 10kHz and the current intensity of 1mA to 20 mA.
In addition, the above measurements also show that the impedance values of lubricating oils of different iron or water contents decrease with increasing frequency and that the difference between them is significant. Thus, the relationship between the iron or water content in the lubricating oil and the resistance value can be determined. Since there is a good correlation between the iron content and the impedance value in the frequency range of 2kHz to 10kHz, any one of the above frequencies can be selected as a characteristic frequency value to analyze the relationship between the impedance value of the lubricating oil and the iron or water content. And (3) selecting excitation current with the frequency of 4910.0Hz and the current intensity of 20mA for detection, establishing a mathematical model of the relation between the impedance of the lubricating oil and the concentration of the iron content, and presenting a cubic curve relation between the impedance value and the concentration of the iron content, so that cubic curve fitting is adopted. FIG. 6 is a graph showing the relationship between the resistance value of a lubricating oil and the concentration of iron in the lubricating oil in a cubic form, wherein the ordinate represents the iron content y in the lubricating oil1In% on the abscissa, the value of the impedance x of the lubricating oil1And the unit is omega. Therefore, when the excitation current with the frequency of 4910.0Hz and the current intensity of 20mA is adopted for detection, the cubic equation relation between the lubricating oil impedance value and the iron content concentration can be obtained:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1The impedance value of the lubricating oil is shown in omega.
Similarly, a cubic equation relation between the impedance value of the lubricating oil and the water content concentration when the excitation current with the frequency of 10494.0Hz and the current intensity of 20mA is used for detection can be obtained:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
As mentioned above, when the iron content in the lubricating oil is detected, the impedance value of the ferrous lubricating oil sample has better correlation with the iron content when the frequency is in the range of 2kHz to 10 kHz; when the water content in the lubricating oil is detected, the impedance value of the water-containing lubricating oil sample has better correlation with the water content when the frequency is in the range of 5kHz to 10 kHz. Thus, the cubic equation y = a-a may be employed1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Are coefficients.
Detailed description of the preferred embodiment 1
In order to verify the accuracy and reliability of the method for detecting the iron content in the lubricating oil, the iron-containing lubricating oil samples are prepared artificially, the iron content of the iron-containing lubricating oil samples is 0.15%, 0.5%,0.75%, 1% and 2%, after the iron-containing lubricating oil samples are stirred fully and uniformly, the impedance value of the samples is detected by the method for detecting the iron content, the detected iron content value is calculated, wherein the set frequency is 4910.0Hz, the excitation current is 20mA, and the detection results are shown in the following table 1.
Table 1: the test result of the test sample under the conditions of 4910.0Hz and 20mA
| 1 | 2 | 3 | 4 | 5 | Remarks for note | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detection of iron content | 0.141% | 0.493% | 0.734% | 0.971% | 1.935% |
From the results shown in table 1, it is understood that the actual detection using the method for detecting the iron content in lubricating oil of the present invention resulted in an iron content that was substantially the same as the iron content added at the time of sample preparation, i.e., the theoretical iron content, and had a small error range.
Specific example 2
The detection results are shown in table 2 below, using substantially the same detection conditions as in example 1, except that the frequency was set to 1.91kHz and the excitation current was set to 20 mA.
Table 2: test results of test samples under the conditions of 1.91kHz and 20mA
| 1 | 2 | 3 | 4 | 5 | Remarks for note | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detection of iron content | 0.131% | 0.473% | 0.725% | 0.912% | 1.867% |
From the results shown in table 2, it is understood that the actual detection using the method for detecting the iron content in lubricating oil of the present invention resulted in an iron content that was substantially the same as the iron content added at the time of sample preparation, i.e., the theoretical iron content, and had a small error range. In this embodiment the frequency is set to a lower value and the excitation current to a higher value.
Specific example 3
The detection results are shown in table 3 below, using substantially the same detection conditions as in example 1, except that the frequency was set to 9.2kHz and the excitation current was set to 2 mA.
Table 3: test results of test samples under the conditions of 9.2kHz and 2mA
| 1 | 2 | 3 | 4 | 5 | Remarks for note | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detection of iron content | 0.134% | 0.475% | 0.732% | 0.946% | 1.923% |
From the results shown in table 3, it can be seen that, although the set frequency and the excitation current are changed, the method for detecting the iron content in the lubricating oil according to the present invention can obtain a more accurate detection result, and has a smaller error range. In this embodiment the frequency is set to a higher value and the excitation current to a lower value.
Specific example 4
With substantially the same test conditions as in example 1, only a frequency of 4.82kHz and an excitation current of 9.5mA were set, and the test results are shown in table 4 below.
Table 4: the test sample has the detection results under the conditions of 4.82kHz and 9.5mA
| 1 | 2 | 3 | 4 | 5 | Remarks for note | |
| Theoretical iron content | 0.15% | 0.5% | 0.75% | 1% | 2% | |
| Detection of iron content | 0.138% | 0.478% | 0.736% | 0.96% | 1.95% |
From the results shown in table 4, it can be seen that, although the set frequency and the excitation current are changed, the method for detecting the iron content in the lubricating oil according to the present invention can obtain a more accurate detection result, and has a smaller error range. In this embodiment both the set frequency and the excitation current are intermediate values.
Specific example 5
In order to verify the accuracy and reliability of the method for detecting the water content in the lubricating oil, the samples of the water-containing lubricating oil are artificially prepared, the water content of the samples is respectively 0.1%,0.2%,0.5%,0.75%,1.25%,2.5% and 5%, after the samples are fully and uniformly stirred, the impedance value of the samples is detected by the method for detecting the water content, the value of the detected water content is calculated, wherein the set frequency is 10494.0Hz, the excitation current is 20mA, and the detection results are shown in the following table 4.
Table 5: the test result of the test sample under the conditions of 10494.0Hz and 20mA
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks for note | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detecting water content | 0.108% | 0.231% | 0.523% | 0.761% | 1.231% | 2.403% | 5.012% |
From the results shown in Table 5, it is understood that the water content obtained by the actual measurement using the method for measuring the water content in lubricating oil of the present invention is substantially the same as the water content added at the time of sample preparation, i.e., the theoretical water content, and has a small error range.
Specific example 6
The detection results are shown in table 6 below, using substantially the same detection conditions as in example 5, except that the frequency was set to 5.165kHz and the excitation current was set to 2 mA.
Table 6: the test result of the test sample under the conditions of 5.165kHz and 20mA
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks for note | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detecting water content | 0.119% | 0.250% | 0.547% | 0.786% | 1.319% | 2.243% | 5.032% |
From the results shown in Table 6, it is understood that the water content obtained by the actual measurement using the method for measuring the water content in lubricating oil of the present invention is substantially the same as the water content added at the time of sample preparation, i.e., the theoretical water content, and has a small error range. In this embodiment the frequency is set to a lower value and the excitation current to a higher value.
Specific example 7
With substantially the same test conditions as in example 5, only 8.146kHz and 2mA of excitation current were set, and the test results are shown in Table 7 below.
Table 7: the test result of the test sample under the conditions of 8.146kHz and 2mA
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks for note | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detecting water content | 0.149% | 0.284% | 0.570% | 0.717% | 1.953% | 2.203% | 5.066% |
From the results shown in table 7, it can be seen that, although the set frequency and the excitation current are changed, the method for detecting the water content in the lubricating oil according to the present invention can obtain a more accurate detection result and has a smaller error range. In this embodiment the frequency is set to a higher value and the excitation current to a lower value.
Specific example 8
With substantially the same test conditions as in example 5, only 4.82kHz and 9.5mA excitation current were set, and the test results are shown in table 8 below.
Table 8: the test sample has the detection results under the conditions of 10494kHz and 9.5mA
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | Remarks for note | |
| Theoretical water content | 0.1% | 0.2% | 0.5% | 0.75% | 1.25% | 2.5% | 5% | |
| Detecting water content | 0.110% | 0.264% | 0.407% | 0.744% | 1.804% | 2.264% | 5.017% |
From the results shown in table 8, it can be seen that, although the set frequency and the excitation current are changed, the method for detecting the water content in the lubricating oil according to the present invention can obtain a more accurate detection result, and has a smaller error range. In this embodiment both the set frequency and the excitation current are intermediate values.
Obviously, the method for detecting the content of iron or water in the lubricating oil has the advantages that equipment with lower cost is adopted to detect the content of iron or water in the lubricating oil, the measuring speed is high, the operation is simple and convenient, the measuring result is accurate and reliable, and the repeatability is good.
Claims (2)
1. A method for detecting the content of iron or water in lubricating oil is characterized by comprising the following steps: measuring the impedance value of the lubricating oil by using the excitation current with set frequency and intensity, and adopting a cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; the measuring temperature is 20-25 ℃, the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0mm, the measuring electrodes are circular sheets with the diameter of 38.0mm, the measuring electrodes are symmetrically arranged at the geometric center of the container, and the distance between the measuring electrodes is 3.0 mm; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
2. The method for detecting the content of iron or water in lubricating oil according to claim 1, characterized in that: the method comprises the following steps:
s1, filling lubricating oil to be detected into a measuring container, and placing the measuring container on an ultrasonic oscillator to mix for more than 10 minutes so that iron particles are uniformly suspended in the lubricating oil; the measuring container is cylindrical with the diameter of 38.0mm and the height of 50.0 mm;
s2, arranging measuring electrodes in the lubricating oil, wherein the measuring electrodes are symmetrically arranged at the geometric center of the measuring container, the measuring electrodes are round pieces with the diameter of 38.0mm, and the distance between the measuring electrodes is 3.0 mm;
s3, testing the impedance value of the lubricating oil by adopting exciting current with set frequency, wherein the measurement temperature is 20-25 ℃; when the content of iron in the lubricating oil is detected, the set frequency is 2kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA; when the water content in the lubricating oil is detected, the set frequency is 5kHz to 10kHz, and the excitation current intensity is 1 mA-20 mA;
s4, using a cubic equation y = a-a1x+a2x2-a3x3Calculating the content of iron or water in the lubricating oil, wherein y is the content of iron or water in the lubricating oil and the unit percent, x is the impedance value of the lubricating oil and the unit is omega, a and a1、a2、a3Is a coefficient; wherein,
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 4910.0Hz and the current intensity of 20mA, the iron content value in the lubricating oil is calculated by adopting the following formula:
y1=75184.6-0.6x1+1.2×10-6x1 2-9.7×10-13x1 3
in the formula: y is1Is the iron content value in percent x1Is the impedance value of the lubricating oil, and the unit is omega;
when the impedance value of the lubricating oil is measured by using an excitation current with the frequency of 10494.0Hz and the current intensity of 20mA, the water content value in the lubricating oil is calculated by using the following formula:
y2=200803.48-10439.04x2+2452.86x2 2-219.83x2 3
in the formula: y is2Is a water content value in% x2The impedance value of the lubricating oil is shown in omega.
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