CN103616331A - Device and method for detecting moisture content of lubricating oil - Google Patents
Device and method for detecting moisture content of lubricating oil Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting the moisture content of lubricating oil. The device comprises a platform, a micro-fluidic chip, a driving component, a sample collection component, an infrared emission component, an optical receiving component and a signal and data processing component, wherein the platform is in a dark room structure; the infrared emission component is connected with the platform; the micro-fluidic chip and the optical receiving component are fixed in the platform; the micro-fluidic chip is connected with the driving component and the sample collection component respectively; the optical receiving component is connected with the signal and data processing component. A specific wavelength sensitive to water absorption is extracted from a near infrared spectrum of water-containing lubricating oil by utilizing the characteristic that infrared absorption wavelengths of the lubricating oil and water are different, and the corresponding moisture content value can be obtained by monitoring the condition that the power of transmission light of the detected lubricating oil changes along with the moisture content under the specific wavelength. According to the device, the moisture content can be obtained by observing signal attenuation, a complex program in a chemical detection method is avoided, and the detection time is greatly shortened.
Description
Technical field
Invention relates to a kind of detection technique, particularly a kind of water content of lubricating oil amount detecting device and detection method thereof of water cut
Background technology
Lubricating oil is plant equipment " blood ", and it plays sealing, lubricated, anti-attrition, cooling, cleaning, vibration damping and the vital role such as anticorrosion in plant equipment.Lubricating system and the lubricated life-span of secondary element and the cleanliness of lubricating oil have very close relationship, wherein the pollution of the water in lubricating oil is one of modal pollution, science obtains moisture measurement result accurately, is the main target that current lubricant pollution degree detects.
The method detecting for water content of lubricating oil amount at present mainly contains: the way of distillation, capacitance method, Electromagnetic Wave Method and electrical conductivity method etc.
The way of distillation, it is a kind of traditional off-line checking method, in the oil samples of soon getting, add anhydrous solvent, in moisture teller, distill, oil and water separation the most at last, measure respectively the quality of oil, water, thereby obtain crude quality water percentage, by the water percentage of sample just deducibility go out the water percentage situation of whole oil product.Not only sense cycle is long, cost is high for the detection method of this off-line, program is loaded down with trivial details, and too relies on experimenter's acquisition and process experimental data, can not reflect in real time the water cut of lubricating oil.
Capacitance method, the principle of utilizing water and oily specific inductive capacity to differ greatly realizes crude oil water content and detects, and the subtle change of water percentage, can cause the larger variation of lubricating oil specific inductive capacity, the variation of specific inductive capacity can be reflected as to the variation of capacitance, by measuring capacitance, just obtain water percentage.But this detection method is vulnerable to the impact of the several factors such as temperature and impurity gather, easily produce metering drift, the shortcoming such as long-time stability are poor.
Electromagnetic Wave Method, different with the physical property of water according to oil, they also have very big difference to electro-magnetic wave absorption ability, utilizing oscillating circuit, is electromagnetic wave by electric energy conversion, and is radiated in oil water mixture, and the electromagnetic wave through fluid-mixing is received, when water percentage is different, fluid-mixing is also different to electromagnetic absorption, by the electromagnetic intensity receiving, detects crude oil water content.Its shortcoming is in oil, conventionally to contain other impurity, and the different meetings of receptivity of different impurities affect measuring accuracy, and probe making is complicated, and cost is high, and operation and maintenance difficulty, so practical application is fewer.
Electrical conductivity method, utilize oil and the widely different feature of electrical conductivity of water, by two pole plates (or cylinder electrode) that are parallel to each other and distance is fixing, be put in detected solution, at the two ends of pole plate, add certain electromotive force, then by electricity between conductivity meter measuring pad, lead.The method has many restrictive conditions, as relevant with fluid flow state in measured value, and conductivity is relevant with liquid ions concentration etc.
To sum up analyze, it is that lubricant pollution degree detects the key issue that urgent need solves that water content of lubricating oil amount detects in real time accurately.
Summary of the invention
The problems referred to above that exist for solving prior art, the present invention will design a kind of water content of lubricating oil amount detecting device and detection method thereof that realizes testing result accurately and can real-time online measuring.
For achieving the above object, technical scheme of the present invention is as follows: a kind of water content of lubricating oil amount detecting device, comprise platform, micro-fluidic chip, driven unit, sample collection assembly, infrared emission assembly, optical fiber receive module, signal and data handling component, described platform is darkroom structure, infrared emission assembly is connected with platform, micro-fluidic chip and optical fiber receive module are fixed in platform, micro-fluidic chip is connected with driven unit, sample collection assembly respectively, and optical fiber receive module is connected with signal and data handling component.
Described micro-fluidic chip consists of substrate and cover plate, described cover plate surface is provided with two sample liquid storage tanks, between two sample liquid storage tanks, be provided with the sample channel of connection, in sample channel, be provided with surveyed area, in the surveyed area of sample channel, be provided with microelectrode, in sample liquid storage tank, be provided with driven unit.
Described sample collection assembly consists of microelectrode and function generator, and described microelectrode is arranged in the surveyed area of micro-fluidic chip sample channel;
Described infrared emission assembly consists of single-chip microcomputer, power amplification circuit and infrared light supply, and described single-chip microcomputer and power amplification circuit and infrared light supply are connected in series successively;
Described signal and data handling component consist of amplifier, filtering circuit and digital to analog converter, and described amplifier and filtering circuit and digital to analog converter are connected in series successively.
Driven unit of the present invention is pressure-driven assembly.
Optical fiber receive module of the present invention is for surveying the device of infrared light, and the device of described detection infrared light comprises photoconductive detector.Photoconductive detector of the present invention is vulcanized lead photoconductive detector.
The material of substrate of the present invention is glass, and the material of described cover plate is dimethyl silicone polymer.
A detection method for water content of lubricating oil amount detecting device, comprises the steps:
A, the sample of lubricating oil containing water is joined to sample liquid storage tank, open driven unit, lubricating oil containing water is flowed along sample channel; Open infrared emission assembly, optical fiber receive module and signal and data handling component; Single-chip microcomputer in infrared emission assembly is exported certain pulsed drive infrared light supply, obtains suitable light intensity, is convenient to detect;
B, open sample collection assembly, by function generator, provide high frequency low voltage electricity, make to form high field in the surveyed area of sample channel, make the water droplet that disperses in lubricating oil under electric field force effect towards the high or low regional movement of electric field intensity;
Water droplet in the lubricating oil of C, the surveyed area of flowing through forms large water droplet under the effect of sample collection assembly;
D, optical fiber receive module are converted to electric signal by light, and electric signal is converted to digital signal by signal and data handling component, and described electric signal is voltage signal; By voltage signal amplitude size judgement moisture; As large in voltage signal decay, represent that moisture is large; Otherwise, represent that moisture is little; By the damping capacity of voltage signal, draw the number percent of corresponding lubricating oil liquid water content.
Compared with prior art, the present invention has following advantages:
1, it is different that the present invention utilizes the infrared absorption wavelength of lubricating oil and water, from the near infrared spectrum of lubricating oil containing water, extract the more sensitive specific wavelength of the absorptance of water, under monitoring specific wavelength, the transmitted optical power of the tested lubricating oil of process, with the situation of change of water percentage, just can obtain corresponding water cut value.
The present invention detects water content of lubricating oil amount with infrared absorption method and can directly to lubricating oil sample, detect, and without pre-service, does not need that sample is added to any reagent and processes, therefore can contaminated samples.
2, the present invention compares with conventional chemical detection method with infrared absorption method, and detection time is very short, by observation signal damping capacity, just can obtain water cut, has avoided the complicated procedures of chemical detection method, has greatly shortened detection time.
3, the present invention adopts sample collection assembly, under low pressure HF voltage, make to form inhomogeneous field in micro-fluidic chip passage, the water droplet that makes to be dispersed in fluid under electric field force effect moves and is gathered in surveyed area, the unconspicuous drawback of signal attenuation while having avoided single water droplet by surveyed area, further improved the sensitivity of pick-up unit, made testing result more accurate.
4, the present invention is due to the microfluidic platform that adopts micro-fluidic chip to detect as water content of lubricating oil amount, and relevant Photoelectric Detection equipment also can adopt the version of small volume, therefore, with respect to existing large-scale checkout equipment, the present invention have volume little, simple in structure, can real-time online detection etc. advantage.
The problems such as 5, the present invention has overcome cannot real-time online detecting of existing in existing water content of lubricating oil quantity measuring method, checkout equipment is expensive, program is loaded down with trivial details, measuring error is larger, fundamentally solve water content of lubricating oil amount test problems.This implements to look feelings maintenance and preventive maintenance by stability, reliability for raising equipment operation, reduces maintenance cost, the having great importance of minimizing accident.
Accompanying drawing explanation
The present invention has accompanying drawing 3 width, wherein:
Fig. 1 is water content of lubricating oil amount detecting device structural representation;
Fig. 2 is microfluidic chip structure schematic diagram;
Fig. 3 is the testing result of lubricating oil containing water sample.
In figure: 1, infrared emission assembly, 2, micro-fluidic chip, 3, optical fiber receive module, 4, signal and data handling component, 5, driven unit, 6, sample collection assembly, 7, platform, 8, cover plate, 9, sample liquid storage tank, 10, sample channel, 11, microelectrode, 12, surveyed area, 13, substrate.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1-2, a kind of water content of lubricating oil amount detecting device, comprise platform 7, micro-fluidic chip 2, driven unit 5, sample collection assembly 6, infrared emission assembly 1, optical fiber receive module 3, signal and data handling component 4, described platform 7 is darkroom structure, infrared emission assembly 1 is connected with platform 7, micro-fluidic chip 2 and optical fiber receive module 3 are fixed in platform 7, micro-fluidic chip 2 is connected with driven unit 5, sample collection assembly 6 respectively, and optical fiber receive module 3 is connected with signal and data handling component 4.Described micro-fluidic chip 2 consists of substrate 13 and cover plate 8, described cover plate 8 surfaces are provided with two sample liquid storage tanks 9, between two sample liquid storage tanks 9, be provided with the sample channel 10 of connection, in sample channel 10, be provided with surveyed area 12, in the surveyed area 12 of sample channel 10, be provided with microelectrode 11, in sample liquid storage tank 9, be provided with driven unit 5.Described sample collection assembly 6 consists of microelectrode 11 and function generator, and described microelectrode 11 is arranged in the surveyed area 12 of micro-fluidic chip 2 sample channels 10; Described infrared emission assembly 1 consists of single-chip microcomputer, power amplification circuit and infrared light supply, and described single-chip microcomputer and power amplification circuit and infrared light supply are connected in series successively; Described signal and data handling component 4 consist of amplifier, filtering circuit and digital to analog converter, and described amplifier and filtering circuit and digital to analog converter are connected in series successively.Described driven unit 5 is pressure-driven assembly.Described optical fiber receive module 3 is for surveying the device of infrared light, and the device of described detection infrared light comprises photoconductive detector.Photoconductive detector of the present invention is vulcanized lead photoconductive detector.The material of described substrate 13 is glass, and the material of described cover plate 8 is dimethyl silicone polymer.
A detection method for water content of lubricating oil amount detecting device, comprises the steps:
1, the sample of 20 μ L lubricating oil containing waters is joined to sample liquid storage tank 9, open driven unit 5, lubricating oil containing water is flowed along sample channel 10.Open infrared emission assembly 1, optical fiber receive module 3, signal and data handling component 4; Single-chip microcomputer in infrared emission assembly 1 is exported certain pulsed drive infrared light supply, obtains suitable light intensity, is convenient to detect;
2, open sample collection assembly 6, by function generator, provide high frequency low voltage electricity, make 8 li of the surveyed areas of sample channel 10 form high electric field intensity, make the water droplet that disperses in the lubricating oil regional movement towards electric field intensity high (or low) under electric field force effect;
The water droplet of 3, flowing through in the lubricating oil of surveyed area 8 forms large water droplet under the effect of sample collection assembly 6, has absorbed a large amount of infrared lights, makes signal weaken decay, the unconspicuous drawback of signal attenuation while having avoided single water droplet by surveyed area.
4, optical fiber receive module 3 is converted to electric signal by light, and electric signal is converted to digital signal by signal and data handling component 4, and described electric signal is voltage signal; By voltage signal amplitude size judgement moisture; As large in voltage signal decay, represent that moisture is large; Otherwise, represent that moisture is little; By the damping capacity of voltage signal, draw the number percent of corresponding lubricating oil liquid water content.The results are shown in accompanying drawing 3.
Claims (6)
1. a water content of lubricating oil amount detecting device, it is characterized in that: comprise platform (7), micro-fluidic chip (2), driven unit (5), sample collection assembly (6), infrared emission assembly (1), optical fiber receive module (3), signal and data handling component (4), described platform (7) is darkroom structure, infrared emission assembly (1) is connected with platform (7), micro-fluidic chip (2) and optical fiber receive module (3) are fixed in platform (7), micro-fluidic chip (2) respectively with driven unit (5), sample collection assembly (6) connects, optical fiber receive module (3) is connected with signal and data handling component (4),
Described micro-fluidic chip (2) consists of substrate (13) and cover plate (8), described cover plate (8) surface is provided with two sample liquid storage tanks (9), between two sample liquid storage tanks (9), be provided with the sample channel (10) of connection, in sample channel (10), be provided with surveyed area (12), in the surveyed area (12) of sample channel (10), be provided with microelectrode (11), in sample liquid storage tank (9), be provided with driven unit (5);
Described sample collection assembly (6) consists of microelectrode (11) and function generator, and described microelectrode (11) is arranged in the surveyed area (12) of micro-fluidic chip (2) sample channel (10);
Described infrared emission assembly (1) consists of single-chip microcomputer, power amplification circuit and infrared light supply, and described single-chip microcomputer and power amplification circuit and infrared light supply are connected in series successively;
Described signal and data handling component (4) consist of amplifier, filtering circuit and digital to analog converter, and described amplifier and filtering circuit and digital to analog converter are connected in series successively.
2. a kind of water content of lubricating oil amount detecting device according to claim 1, is characterized in that: described driven unit (5) is pressure-driven assembly.
3. a kind of water content of lubricating oil amount detecting device according to claim 1, is characterized in that: described optical fiber receive module (3) is for surveying the device of infrared light, and the device of described detection infrared light comprises photoconductive detector.
4. a kind of water content of lubricating oil amount detecting device according to claim 3, is characterized in that: described photoconductive detector is vulcanized lead photoconductive detector.
5. a kind of water content of lubricating oil amount detecting device according to claim 1, is characterized in that: the material of described substrate (13) is glass, and the material of described cover plate (8) is dimethyl silicone polymer.
6. a detection method for water content of lubricating oil amount detecting device, is characterized in that: comprise the steps:
A, the sample of lubricating oil containing water is joined to sample liquid storage tank (9), open driven unit (5), lubricating oil containing water is flowed along sample channel (10); Open infrared emission assembly (1), optical fiber receive module (3) and signal and data handling component (4); Single-chip microcomputer in infrared emission assembly (1) is exported certain pulsed drive infrared light supply, obtains suitable light intensity, is convenient to detect;
B, unlatching sample collection assembly (6), by function generator, provide high frequency low voltage electricity, make the inner high field that forms of surveyed area (12) of sample channel (10), make the water droplet that disperses in lubricating oil under electric field force effect towards the high or low regional movement of electric field intensity;
Water droplet in the lubricating oil of C, the surveyed area of flowing through (12) forms large water droplet under the effect of sample collection assembly (6);
D, optical fiber receive module (3) are converted to electric signal by light, and electric signal is converted to digital signal by signal and data handling component (4), and described electric signal is voltage signal; By voltage signal amplitude size judgement moisture; As large in voltage signal decay, represent that moisture is large; Otherwise, represent that moisture is little; By the damping capacity of voltage signal, draw the number percent of corresponding lubricating oil liquid water content.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103837497A (en) * | 2014-03-14 | 2014-06-04 | 大连海事大学 | Device for detecting moisture content of lubricating oil and detection method thereof |
| CN104020130A (en) * | 2014-06-03 | 2014-09-03 | 北京乾达源科技有限公司 | Online detection device and method of content of trace oil in water |
| CN105352912A (en) * | 2015-12-11 | 2016-02-24 | 天津成科传动机电技术股份有限公司 | Water-in-oil detecting device based on infrared absorption method |
| CN105806424A (en) * | 2016-03-15 | 2016-07-27 | 成都中油翼龙科技有限责任公司 | Multi-phase flow nondisjunction online measuring device and measuring method thereof |
| TWI575234B (en) * | 2016-01-12 | 2017-03-21 | 國立虎尾科技大學 | Monitoring the water content of lubricating oil with light penetration area |
| CN107228836A (en) * | 2017-05-30 | 2017-10-03 | 武汉材料保护研究所 | The infrared spectrum on-line testing method of lubricating oil high-temp friction process |
| CN107817225A (en) * | 2017-12-15 | 2018-03-20 | 深圳市智水小荷技术有限公司 | A kind of method of oil content in measurement water |
| CN108226543A (en) * | 2017-12-01 | 2018-06-29 | 常州思宇知识产权运营有限公司 | A kind of water content of lubricating oil amount detecting device |
| CN108533936A (en) * | 2018-06-27 | 2018-09-14 | 新疆金风科技股份有限公司 | Bearing automatic lubricating system and control method for wind power generating set |
| CN109870485A (en) * | 2019-03-19 | 2019-06-11 | 闫朝恩 | A kind of lubricating oil water content detection device |
| TWI730889B (en) * | 2020-08-31 | 2021-06-11 | 國立虎尾科技大學 | Method for detecting the water content in the liquid to be measured by infrared rays |
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Cited By (15)
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| CN103837497A (en) * | 2014-03-14 | 2014-06-04 | 大连海事大学 | Device for detecting moisture content of lubricating oil and detection method thereof |
| CN103837497B (en) * | 2014-03-14 | 2015-12-30 | 大连海事大学 | A kind of pick-up unit of Moisture in Lube Oil & content and detection method thereof |
| CN104020130A (en) * | 2014-06-03 | 2014-09-03 | 北京乾达源科技有限公司 | Online detection device and method of content of trace oil in water |
| CN105352912A (en) * | 2015-12-11 | 2016-02-24 | 天津成科传动机电技术股份有限公司 | Water-in-oil detecting device based on infrared absorption method |
| TWI575234B (en) * | 2016-01-12 | 2017-03-21 | 國立虎尾科技大學 | Monitoring the water content of lubricating oil with light penetration area |
| CN105806424A (en) * | 2016-03-15 | 2016-07-27 | 成都中油翼龙科技有限责任公司 | Multi-phase flow nondisjunction online measuring device and measuring method thereof |
| CN107228836A (en) * | 2017-05-30 | 2017-10-03 | 武汉材料保护研究所 | The infrared spectrum on-line testing method of lubricating oil high-temp friction process |
| CN108226543A (en) * | 2017-12-01 | 2018-06-29 | 常州思宇知识产权运营有限公司 | A kind of water content of lubricating oil amount detecting device |
| CN107817225A (en) * | 2017-12-15 | 2018-03-20 | 深圳市智水小荷技术有限公司 | A kind of method of oil content in measurement water |
| CN107817225B (en) * | 2017-12-15 | 2020-07-14 | 深圳市智水小荷技术有限公司 | Method for measuring oil content in water |
| CN108533936A (en) * | 2018-06-27 | 2018-09-14 | 新疆金风科技股份有限公司 | Bearing automatic lubricating system and control method for wind power generating set |
| CN108533936B (en) * | 2018-06-27 | 2022-08-09 | 新疆金风科技股份有限公司 | Automatic bearing lubricating system for wind generating set and control method |
| CN109870485A (en) * | 2019-03-19 | 2019-06-11 | 闫朝恩 | A kind of lubricating oil water content detection device |
| CN109870485B (en) * | 2019-03-19 | 2021-04-16 | 山东腾辉润滑油科技有限公司 | Lubricating oil moisture content check out test set |
| TWI730889B (en) * | 2020-08-31 | 2021-06-11 | 國立虎尾科技大學 | Method for detecting the water content in the liquid to be measured by infrared rays |
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