CN111220516A - Method for detecting content of particle pollutants in aviation working solution - Google Patents
Method for detecting content of particle pollutants in aviation working solution Download PDFInfo
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- CN111220516A CN111220516A CN201811423000.7A CN201811423000A CN111220516A CN 111220516 A CN111220516 A CN 111220516A CN 201811423000 A CN201811423000 A CN 201811423000A CN 111220516 A CN111220516 A CN 111220516A
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- 239000002245 particle Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 9
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 9
- 239000012224 working solution Substances 0.000 title claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 29
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000010687 lubricating oil Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 14
- 238000011109 contamination Methods 0.000 claims description 13
- 238000010790 dilution Methods 0.000 claims description 10
- 239000012895 dilution Substances 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000527 sonication Methods 0.000 description 4
- 238000000386 microscopy Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010689 synthetic lubricating oil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for detecting the content of particle pollutants in aviation working fluid, which comprises the following steps of (1) mixing an aviation working fluid sample with acetone, and carrying out ultrasonic treatment on the mixture to obtain a pretreated sample; (2) the solid particles in the pre-treated sample were counted using a particle counter. The method has real and accurate detection result.
Description
Technical Field
The invention relates to the field of analysis and detection of aviation working fluid, in particular to a method for detecting the content of particle pollutants in aviation working fluid.
Background
Aviation operating fluids, i.e. hydraulic oil, lubricating oil or fuel oil for aircraft.
In aviation working fluid, all solid harmful impurities which are insoluble in the working fluid are called solid particle pollution. Although they are different in composition, shape and size, most of them are small in length-width ratio or granular in shape, so that solid contamination in hydraulic oil is generally referred to as granular contamination, and solid contamination is generally referred to as granules, even fibrous contamination is generally treated as granules.
The degree of contamination by solid particles, i.e., the amount of solid contaminants per unit volume of working fluid.
The method for detecting the particle pollutants in the aviation working fluid in the related art comprises the following steps: automated particle counter methods and microscopy.
The automatic particle counter method is a method for measuring the size and the number of solid particles in liquid by adopting an automatic particle counter which works on the principles of shading, resistance and electronic imaging. The automatic particle counter method has high analysis speed, but has the disadvantage that the result can have deviation
The microscopy is to filter the aviation working solution by using a filter membrane, and analyze and measure the size and the quantity of solid pollutant particles collected on the surface of the filter membrane by using equipment of a microscope working principle. The particle size measurement by microscopy is accurate, but has the disadvantage of long analysis time.
Disclosure of Invention
In some aspects, a method for detecting the content of particle pollutants in aviation working fluid is provided, which comprises the following steps
(1) Mixing an aviation working solution sample with acetone, and carrying out ultrasonic treatment on the mixture to obtain a pretreated sample;
(2) the solid particles in the pre-treated sample were counted using a particle counter.
In some embodiments, the volume ratio of the aviation working fluid sample to the acetone is 5-15: 5-15, such as 8-12: 8-12.
In some embodiments, between steps (1) and (2), the pretreated sample is not agitated. The inventors have surprisingly found that without stirring the pre-treated sample, the results are more true and accurate than with stirring the pre-treated sample.
In some embodiments, between steps (1) and (2), the pretreated sample is kept free of agitation.
In some embodiments, the temperature of the sonication is between 30 ℃ and 40 ℃, for example 35 ℃.
In some embodiments, the time of sonication is 5 to 15 minutes, such as 8 to 12 minutes, such as 10 minutes.
In some embodiments, the power of sonication ranges from 200 to 400W per 100mL of liquid subject, e.g., 300W per 100mL of liquid.
In some embodiments, the power of sonication ranges from 500 to 700W per 200mL of liquid subject, for example 600W per 200mL of liquid.
In some embodiments, the ultrasonic frequency of the ultrasonic treatment is 30 to 50kHz, such as 40 kHz.
In some embodiments, the aviation operating fluid is a hydraulic oil, a lubricating oil, or a fuel oil for an aircraft.
In some embodiments, when particle counting is performed, the number of solid particles in 100mL of aviation operating fluid is calculated according to equation (ii):
P＝F×(X-X1)×100/v (ii)
in the formula:
p is the number of solid particles in a 100mL liquid sample, and the unit is one;
f is the dilution factor;
v-test volume in milliliters (mL)
X-the number of particles contained in the test volume of the pretreated sample, in units of one;
X1-the number of particles introduced by acetone in the test volume of pre-treated sample, in units of one.
In some embodiments, when particle counting is performed, the dilution factor F is calculated according to formula (i):
F＝V/V1(i)
in the formula:
f is the dilution factor;
v is the volume of the pretreatment sample (i.e. the total volume of the aviation working fluid sample mixed with acetone) in milliliters (mL);
V1volume of aviation working fluid sample in milliliters (mL).
In some embodiments, the counting refers to counting particles of different size ranges separately.
In some embodiments, the method further comprises the step of evaluating the solid pollution level of the aviation working fluid according to a preset standard according to the counting result.
In some embodiments, one or more steps of the disclosed methods meet one or more of the following criteria:
GJB 380.1A-2004 aviation working solution pollution test part 1, the general requirements of sampling containers and cleaning methods thereof;
GJB 380.2A-2004 aviation working fluid pollution test part 2, method for collecting liquid sample on system pipeline;
GJB 380.3A-2004 aviation working fluid contamination test part 3, automatic particle counter calibration;
GJB380.4A-2004 aviation working fluid contamination measurement part 4: the degree of contamination of the solid particles was determined by automatic particle counting.
And grading the solid pollution degree of the GJB420B-2015 aviation working fluid.
In some embodiments, the aviation working fluid is a synthetic lubricating oil for aviation turbine engines as specified in GJB-1263-.
In some embodiments, the aviation operating fluid is 4050 aviation lubricating oil (petrochemical science research institute, petrochemical corporation, china).
In some embodiments, the aviation operating fluid is Mobil Jet Oil II aviation lubricating Oil (ExxonMobil).
Advantageous effects
The method of the present application has one or more of the following advantages:
1) the result is accurate;
2) the inspection is quick;
3) the cost is low.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
4050 aviation lubricating oil solid contamination level test
(1) Uniformly shaking a barrel of 2L 4050 aviation lubricating oil fresh oil (namely an aviation working solution sample), measuring 120ml by using a measuring cylinder, pouring into a 250ml clean bottle, measuring 80ml of acetone by using a measuring cylinder, pouring into the clean bottle, fully shaking the two, and placing in an ultrasonic cleaning machine (ultrasonic power 600W and frequency 40kHz) heated to 40 ℃ for ultrasonic treatment for 10min to obtain a pretreated sample.
(2) Reference GJB380.4A-2004 "airborne working fluid contamination measurement part 4: the solid particle pollution degree is measured by an automatic particle counting method, and then the particles are graded by referring to a GJB420B-2015 classification method of the solid pollution degree of the aviation working solution.
When the particle count is performed, the dilution factor F is calculated according to the formula (i) by using the mixing ratio of the lubricating oil and acetone in the pretreated sample as a dilution ratio:
F＝V/V1(i)
in the formula:
f is the dilution factor;
v — volume of pretreated sample in milliliters (mL);
V1volume of aviation working fluid sample in milliliters (mL).
Before calculating the number of solid particles in the 100mL liquid sample, the number of particles in acetone is subtracted, and the number of solid particles in the 100mL aviation operating liquid is calculated according to the formula (ii):
P＝F×(X-X1)×100/v (ii)
in the formula:
p is the number of solid particles in a 100mL liquid sample, and the unit is one;
f is the dilution factor;
v-test volume in milliliters (mL)
X-the number of particles contained in the test volume of the pretreated sample, in units of one;
X1-particles introduced by acetone in a test volume of pretreated sampleNumber, unit is one. By analyzing the number of particles of each particle size separately for acetone by a particle counter, the number of particles of each particle size range per 100mL of acetone was known.
When the particle count was performed, the volume of each washing was 10ml, the number of washing was 3 times, the number of measurements was 3 times, and the average value was taken as the detection result, and the results are shown in table 1 below.
Table 1 also shows the results of particle counter testing of the non-pretreated 4050 aviation oil directly.
TABLE 1
4050 the aviation lubricating oil has a solid pollution degree grade of: GJB420B-4 level.
Level of particulate contamination provided by lubricating oil manufacturers: GJB420B-4 level.
Example 2:
mobil Jet Oil II aviation lubricating Oil solid pollution degree grade test
(1) Uniformly shaking about 1L of Mobil Jet Oil II aviation lubricating Oil new Oil, measuring 80ml by using a measuring cylinder, pouring into a 250ml clean bottle, measuring 120ml of acetone by using the measuring cylinder, pouring into the clean bottle, fully shaking the two, and putting into an ultrasonic cleaning machine heated to 40 ℃ for ultrasonic treatment for 10min (ultrasonic power 600W and ultrasonic frequency 40kHz) to obtain a pretreated sample.
(2) The particle count and rating method was the same as example 1. The results are shown in table 2 below.
Table 2 also shows the results of a Mobil Jet Oil II aviation lubricant run directly on a particle counter test.
TABLE 2
The grade of the solid pollution degree of the Mobil Jet Oil II aviation lubricating Oil is as follows: GJB420B-4 level
Level of particulate contamination provided by lubricating oil manufacturers: GJB420B-4 level.
From the above analysis, it can be known that, for the completely new aviation working solution which is not pretreated, counting and grade evaluation are directly carried out by a counter, the obtained result is far from the standard grade provided by a manufacturer, which indicates that the detection result is not accurate enough. For the aviation working solution pretreated by the method, counting and grade evaluation are carried out by a counter, and the obtained result is completely the same as the standard grade provided by a manufacturer, which shows that the detection result has high accuracy.
Without being limited by theory, the method can effectively remove insoluble liquid drops in the lubricating Oil, thereby avoiding the liquid drops from being mistakenly identified as solid pollutant particles by a Mobil Jet Oil II aviation lubricating Oil particle counter, and further improving the reality and the accuracy of the detection result.
While specific embodiments of the invention have been described in detail, those skilled in the art will understand that: various modifications and changes in detail can be made in light of the overall teachings of the disclosure, and such changes are intended to be within the scope of the present invention. The full scope of the invention is given by the appended claims and any equivalents thereof.
Claims (10)
1. A method for detecting the content of particle pollutants in aviation working fluid comprises
(1) Mixing an aviation working solution sample with acetone, and carrying out ultrasonic treatment on the mixture to obtain a pretreated sample;
(2) the solid particles in the pre-treated sample were counted using a particle counter.
2. The method of claim 1, wherein between steps (1) and (2), the pre-treated sample is not agitated.
3. The method of claim 1, characterized by one or more of the following:
the temperature of ultrasonic treatment is 30-40 ℃;
the power of ultrasonic treatment is 200-400W per 100mL of liquid;
the ultrasonic frequency of ultrasonic treatment is 30-50 kHz;
the volume ratio of the aviation working solution sample to the acetone is 5-15: 5-15.
4. The method according to claim 1, wherein the time for the ultrasonic treatment is 5 to 15 minutes.
5. The method of claim 1, sonicating the mixture using an ultrasonic oscillator.
6. The method of claim 1, wherein the aviation operating fluid is a hydraulic oil, a lubricating oil, or a fuel oil for an aircraft.
7. The method of claim 7, wherein the particle count is performed by calculating the number of solid particles in 100mL of aviation operating fluid according to formula (ii):
P＝F×(X-X1)×100/v (ii)
in the formula:
p is the number of solid particles in a 100mL liquid sample, and the unit is one;
f is the dilution factor;
v-test volume in milliliters;
x-the number of particles contained in the test volume of the pretreated sample, in units of one;
X1-the number of particles introduced by acetone in the test volume of pre-treated sample, in units of one.
8. The method of claim 7, wherein the particle count is performed by calculating a dilution factor F according to formula (i):
F＝V/V1(i)
in the formula:
f is the dilution factor;
v — volume of pretreated sample in milliliters (mL);
V1volume of aviation working fluid sample in milliliters (mL).
9. The method of claim 1, wherein counting is performed separately for particles of different size ranges.
10. The method of claim 1, further comprising ranking the aviation operating fluid for a level of solid contamination according to a predetermined criteria based on the results of the counting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423000.7A CN111220516A (en) | 2018-11-27 | 2018-11-27 | Method for detecting content of particle pollutants in aviation working solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423000.7A CN111220516A (en) | 2018-11-27 | 2018-11-27 | Method for detecting content of particle pollutants in aviation working solution |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044988A (en) * | 1989-02-15 | 1990-08-29 | 中国人民解放军空军第一研究所 | The simulation method for making of pollution degree of hydraulic oil grade scale lamina membranacea |
| JP2011185913A (en) * | 2010-03-11 | 2011-09-22 | Takata Corp | Method for determining oil deterioration |
| JP2014038001A (en) * | 2012-08-13 | 2014-02-27 | Railway Technical Research Institute | Method for producing sample for metal analysis in grease, method for measuring metal content in grease, method for determining degradation of grease |
| CN108387503A (en) * | 2018-01-22 | 2018-08-10 | 北京海岸鸿蒙标准物质技术有限责任公司 | A kind of valued methods of grain count particle standard substance |
-
2018
- 2018-11-27 CN CN201811423000.7A patent/CN111220516A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044988A (en) * | 1989-02-15 | 1990-08-29 | 中国人民解放军空军第一研究所 | The simulation method for making of pollution degree of hydraulic oil grade scale lamina membranacea |
| JP2011185913A (en) * | 2010-03-11 | 2011-09-22 | Takata Corp | Method for determining oil deterioration |
| JP2014038001A (en) * | 2012-08-13 | 2014-02-27 | Railway Technical Research Institute | Method for producing sample for metal analysis in grease, method for measuring metal content in grease, method for determining degradation of grease |
| CN108387503A (en) * | 2018-01-22 | 2018-08-10 | 北京海岸鸿蒙标准物质技术有限责任公司 | A kind of valued methods of grain count particle standard substance |
Non-Patent Citations (4)
| Title |
|---|
| 于钦学 等: "《电气绝缘实验与分析》", 30 November 2013, 西安交通大学出版社 * |
| 司航: "《有机化工原料 检索工具 第2版》", 31 January 1995 * |
| 郝新友 等: "《中华人民共和国国家军用标准 GJB380.4A-2004》", 1 September 2004, 国防科工委军标出版发行部 * |
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Application publication date: 20200602 |