CN103321988A - Method for filtering and purifying hydraulic oil - Google Patents
Method for filtering and purifying hydraulic oil Download PDFInfo
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Abstract
A method for filtering and purifying hydraulic oil comprises the steps of (1) using an electrical heating system for heating oil to 60 DEG C; (2) performing primary filtering through a first filtering device which comprises novel high-gradient electromagnetic filters connected in parallel so as to filter ferromagnetic corrosion products in the oil and macromolecules generated by oxidation during usage of the hydraulic oil; (3) performing secondary filtering through a second filtering device to remove large solid particles; (4) subjecting the oil to tertiary filtering through a third filtering device which comprises common parallelly-connected filters high in filtering accuracy to form redundancies; (5) opening exhaust valves which are mounted after filtering of all stages to remove gas impurities in the oil and bubbles generated during filtering; (6) removing moisture in the oil through an oil-water separation system; (7) monitoring the oil cleanliness class in real time through a contamination particle counter, and closing a solenoid valve of an oil return pipe when the purification class requirement is reached.
Description
Technical field
This paper relates to a kind of hydraulic oil filtering purification method, is specifically related to adopt magnetic filtration, coarse filtration and three grades of redundant circulating filtration methods of secondary filter to obtain requiring the fluid of lustration class.The pollution sources of hydraulic oil mainly contain: the large molecule that solid particle, water, air, oxidation produce etc. are with discarded Hydraulic oil pollutants process the method filtering contaminants of industry, and realization fuzzy control, be used for purifying the pollution fluid for hydraulic element and system, realize again utilizing.The method adopts fuzzy control model, can realize automatic control.The advantages such as this filter method cost is low, the time is short, the life-span is long, reliability is high, automatic control belong to the technical field of auxiliary facilities of Aero-Space, automobile, machine tool mechanical.
Background technique
Compare with traditional filter method, the combination of filters method has that the filtrate precision is higher, advantages of simple structure and simple.Along with deepening continuously of research work, deficiency and the weakness of filtering combined method come out gradually, and be short such as the life-span, reliability is low, filter efficiency is low, can not realize automation etc.Meanwhile, multistage filtering method and intelligently filters method are developed and use, and the multistage filtering method has the high characteristics of filter precision.Smart filter can realize automatic control, does not rely on people, filter efficiency high.
The shortcomings such as present existing multistage filtering method is the three-stage filtration method, is CN200320124413 " hydraulic oil purifying system " such as application number, has proposed the multistage purification method, does not realize automatically control but exist, and needs often to clean, and the life-span is short.Application number is that 2012201811044 " intelligent control Combined oil purification apparatus " designed an intelligent control, but filter precision is not high enough, the life-span is short, filter efficiency is low etc.Fuzzy control model seldom occurs in the hydraulic oil filtering system, so the present invention proposes a kind of fuzzy control method of three grades of redundant circulating filtrations.
Summary of the invention
A. goal of the invention
The filter purification method that the purpose of this invention is to provide a kind of hydraulic oil, it is a kind of purification method for hydraulic element and systemic contamination fluid, has the characteristics of three grades of redundant circulating filtrations of fuzzy control function.The method has the advantages such as reliability is high, the life-span is long, purification efficiency is high, automatic control.
B. technological scheme
The filter purification method of a kind of hydraulic oil of the present invention, its step is as follows:
Step 1: use electric heating system, fluid is heated
Described electric heating system comprises: electric heater 2, thermometer 3 and fuzzy control model 15.Described electric heater 2, it is that a kind of common temperature is adjustable, has the electric heater of heating fluid function, is installed in the position near filler opening, links to each other with fuzzy control model 15.At first fluid is heated to 60 ℃; Described thermometer 3, it is a kind of common thermometer, range is 0 ℃～100 ℃, is installed in the outlet of electric heater 2, the variation of monitoring oil liquid temperature; Described fuzzy control model 15, it is a kind of integrated software that a plurality of hydraulic element and parameter are had the fuzzy control function that has, its function is the hydraulic filtering system to be realized the function of fuzzy control, the functions such as the valve opening that can automatically process filtration system is closed, warning and system heating, exhaust;
Step 2: by first level filtering device, carry out single filter
Described first level filtering device comprises: electromagnetic filter 4, solenoid valve 1, warning device 8, fuzzy control model 15.Described electromagnetic filter 4, it is a kind of novel high gradient electromagnetic filter, adopt a plurality of parallel connections (generally being 3～5 electromagnetic filter parallel connections), carry out single filter, with the large molecule of oxidation generation in ferromagnetism corrosion products in the filtering fluid and the hydraulic oil using process; Described solenoid valve 1, it is that a kind of common tool is controlled the flow of fluid and the solenoid valve 1 of flow rate function, is installed near the filler opening position; Described warning device 8, it is a kind of warning device of making according to differential pressure characteristics, analyzes, judges whether to surpass threshold value by fuzzy control model 15, when surpassing threshold value, closes the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 3: by two-stage filter, carry out cascade filtration
Described two-stage filter comprises: motor-drive pump 5, relief valve 6, coarse-grain filtering device 7, solenoid valve 1, warning device 8, fuzzy control model 15.Described motor-drive pump 5, it is a kind of electric fuel punp, for system provides power, a plurality of motor-drive pumps (generally being 2 motor-drive pump parallel connections) in parallel form redundancy, improve reliability; Described relief valve 6, it is YF type three joint concentric pilot-type relief valves (tubular type), is connected in parallel on the two ends of pump, the protection filter core; Described coarse-grain filtering device 7, it is the lower filter of a kind of common filter precision, adopt the parallel connection (generally being 3～5 coarse-grain filtering device parallel connections) of a plurality of same sizes, to increase filter area and pollutant holding capability, the large molecule that the larger solid particle in the filtering fluid and fluid oxidation produce.The above each coarse-grain filtering device 7 all links to each other with fuzzy control model 15 with solenoid valve 1, and at every one-level filtrating equipment installation warning device 8, analyze, judge whether to surpass threshold value by fuzzy control model 15, when surpassing threshold value, close the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 4: by three-level filter device, carry out three-stage filtration
Described three-level filter device comprises: motor-drive pump 5, relief valve 6, accurate filter 10, solenoid valve 1, warning device 8, fuzzy control model 15.Described accurate filter 10, it is a kind of common higher filter of filter precision, its filter core adopts long fibre, in-depth filtration structure, make through the high density HIGH PRESSURE TREATMENT, the parallel connection of a plurality of same sizes (generally being 3～5 accurate filter parallel connections), to increase filter area, improve its reliability; Above-mentioned each accurate filter 10 all links to each other with fuzzy control model 15 with solenoid valve 1, and one, two and three-level filter device warning device 8 is installed, analyze, judge whether to surpass threshold value by fuzzy control model 15, when surpassing threshold value, close the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 5: open outlet valve, remove the gaseous impurity of fluid
Described outlet valve 10, it is a kind of common outlet valve, is installed in after filtrations at different levels finish, and eliminates the bubble that produces in the filter process, is analyzed by fuzzy control model 15 and judges, if moisture content is many in the fluid, then opens outlet valve, otherwise, close;
Step 6: by oil-water separation system, remove moisture in the fluid
Described oil-water separation system comprises: oily-water seperating equipment 12, tank 13, fuzzy control model 15; Described oily-water seperating equipment 12, it is a kind of common oily-water seperating equipment, links to each other with fuzzy control model 15, if moisture content is higher by analysis, then closes bypass solenoid valve 1, and the oil after purifying is carried out oil-water separation; To a certain specified value, then open bypass solenoid valve 1 when low; Described tank 13, it is a kind of common tank, links to each other with oily-water seperating equipment, collects the waste water that produces in the oil water separation process;
Step 7: adopt the contamination particle counter, Real-Time Monitoring fluid lustration class
Described contamination particle counter 11, but it is the particle collector of the granule number of different size pollutant in a kind of common real time on-line monitoring fluid, link to each other with fuzzy control model 15, purify the rank requirement when reaching requirement, close the solenoid valve 1 of return tube, open the solenoid valve 1 of oil exit pipe, the fluid after the filtration flows into fuel tank 14, otherwise, continue circularly purifying.
C. beneficial effect
The filter purification method of a kind of hydraulic oil of the present invention, heating fluid filters through three grades of redundant circulating filtrations and the oil-water separation of overanxious, the coarse filtration of electromagnetism and secondary filter.The filter parallel redundancy can increase filter area, improves filter efficiency; Certain filter reaches and receives the dirty limit in this external system, and the method does not need to stop to filter filter rinsed, can work on, and can increase reliability and filter efficiency and the life-span of filtration.The motor redundancy can reduce the wearing and tearing of motor, improves the life-span of motor, increases its reliability.Fuzzy control model links to each other with electric heater, filter, warning device, solenoid valve, contamination particle counter etc., can realize the functions such as online automatic detection, fuzzy control can obtaining efficiently, reliably required standard fluid.In addition, according to polluting governing equation, the downstream that obtains pollute Nong Du ?time graph can estimate time of the purification that obtains requiring lustration class fluid.Oil outlet tube and return tube are provided with protection and warning device and detecting method, to exercise supervision oil quality and protect filter core not to be destroyed of filtration system, can reduce unnecessary economic loss.Advantage of the present invention and effect are: this mechanism can realize high efficiency filter, and the filtration system life-span long, can realize automatic control, reliability is high, pollutant holding capability is large, purification efficiency is high, in addition, also can realize time Estimate.
Description of drawings
Fig. 1 is the overall structure schematic diagram of purification method of the present invention.
Fig. 2 is the flow chart of purification method of the present invention.
Fig. 3 is the software flow block diagram in the fuzzy control model of the present invention.
Among the figure: 1, solenoid valve 1,2, electric heater, 3, thermometer, 4, electromagnetic filter, 5, motor-drive pump, 6, relief valve, 7, coarse-grain filtering device, 8, warning device, 9, outlet valve, 10, accurate filter, 11, contamination particle counter, 12, oil-water separation method, 13, tank, 14, fuel tank, 15, fuzzy control model.
Embodiment
The present invention is used for the purification method of hydraulic element and systemic contamination fluid, the filtrating equipment of use as shown in Figure 1, concrete purification process as shown in Figure 2: below in conjunction with accompanying drawing this method is described in further detail.
Step 1: use electric heating system, fluid is heated
Described electric heating system comprises: electric heater 2, thermometer 3 and fuzzy control model 15.Described electric heater 2, it is that a kind of common temperature is adjustable, has the electric heater of heating fluid function, is installed in the position near filler opening, links to each other with fuzzy control model 15; Described fuzzy control model 15, it is a kind of integrated software that a plurality of hydraulic element and parameter are had the fuzzy control function that has, it mainly comprises the process description that heating, single filter, cascade filtration, three-stage filtration, profit filter, its function is the hydraulic filtering system to be realized the function of fuzzy control, the functions such as the valve opening that can automatically process filtration system is closed, warning and system heating, exhaust, the software flow block diagram in this fuzzy control model is as shown in Figure 3; Described thermometer 3, it is a kind of common thermometer, range is 0 ℃～100 ℃, is installed in the outlet of electric heater 2, the variation of monitoring oil liquid temperature;
Step 2: by first level filtering device, carry out single filter
Described first level filtering device comprises: electromagnetic filter 4, solenoid valve 1, warning device 8, fuzzy control model 15.Described electromagnetic filter 4, it is a kind of novel high gradient electromagnetic filter, single filter is carried out in 3 parallel connections, with ferromagnetism corrosion products in the filtering fluid; Described solenoid valve 1, it is that a kind of common tool is controlled the flow of fluid and the solenoid valve 1 of flow rate function, is installed near the filler opening position; Described warning device 8, it is a kind of warning device of making according to differential pressure characteristics, analyzes by fuzzy control model 15, judges whether to surpass threshold value, when surpassing threshold value, closes the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 3: by two-stage filter, carry out cascade filtration
Described two-stage filter comprises: motor-drive pump 5, relief valve 6, coarse-grain filtering device 7, solenoid valve 1, warning device 8, fuzzy control model 15.Described motor-drive pump 5, it is a kind of electric fuel punp, for system provides power, 2 motor-drive pump parallel connections form redundancy, improve reliability; Described relief valve 6, it is YF type three joint concentric pilot-type relief valves (tubular type), is connected in parallel on the two ends of motor-drive pump 5, the protection filter core; Described coarse-grain filtering device 7, it is the lower filter of a kind of common filter precision, adopts coarse-grain filtering device 7 parallel connections of 3 same sizes, to increase filter area and pollutant holding capability.The above each coarse-grain filtering device 7 all links to each other with fuzzy control model 15 with solenoid valve 1, and at every one-level filtrating equipment installation warning device 8, analyze, judge whether to surpass threshold value by fuzzy control model 15, when surpassing threshold value, close the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 4: by three-level filter device, carry out three-stage filtration
Described three-level filter device comprises: motor-drive pump 5, relief valve 6, accurate filter 10, solenoid valve 1, warning device 8, fuzzy control model 15.Described accurate filter 10, it is a kind of common higher filter of filter precision, its filter core adopts long fibre, in-depth filtration structure, makes through the high density HIGH PRESSURE TREATMENT, with the parallel connection of 3 same sizes, to increase filter area, improves its reliability; Above-mentioned each accurate filter 10 all links to each other with fuzzy control model 15 with solenoid valve 1, and one, two and three-level filter device warning device 8 is installed, analyze, judge whether to surpass threshold value by fuzzy control model 15, when surpassing threshold value, close the with it solenoid valve 1 of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 5: open outlet valve, remove the gaseous impurity of fluid
Described outlet valve 10, it is a kind of common outlet valve, is installed in after filtrations at different levels finish, and eliminates the bubble that produces in the filter process, is analyzed by fuzzy control model 15, if moisture content is many in the fluid, then opens outlet valve, otherwise, close;
Step 6: by oil-water separation system, remove moisture in the fluid
Described oil-water separation system comprises: oily-water seperating equipment 12, tank 13, fuzzy control model 15; Described oily-water seperating equipment 12, it is a kind of common oily-water seperating equipment, links to each other with fuzzy control model 15, if moisture content is higher by analysis, then closes bypass solenoid valve 1, and the oil after purifying is carried out oil-water separation; To a certain specified value, then open bypass solenoid valve 1 when low; Described tank 13, it is a kind of common tank, links to each other with oily-water seperating equipment, collects the waste water that produces in the oil water separation process;
Step 7: adopt the contamination particle counter, Real-Time Monitoring fluid lustration class
Described contamination particle counter 11, but it is the particle collector of the granule number of different size pollutant in a kind of common real time on-line monitoring fluid, link to each other with fuzzy control model 15, purify the rank requirement when reaching requirement, close the solenoid valve 1 of return tube, open the solenoid valve 1 of oil exit pipe, the fluid after the filtration flows into fuel tank 14, otherwise, continue circularly purifying.
Claims (5)
1. the filter purification method of a hydraulic oil, it is characterized in that: the implementation step of the method is as follows:
Step 1: use electric heating system, fluid is heated
Described electric heating system comprises: electric heater (2), thermometer (3) and fuzzy control model (15); Described electric heater (2), it is that a kind of common temperature is adjustable, has the electric heater of heating fluid function, is installed in the position near filler opening, links to each other with fuzzy control model (15); At first fluid is heated to 60 ℃; Described thermometer (3), it is a kind of common thermometer, range is 0 ℃～100 ℃, is installed in the outlet of electric heater (2), the variation of monitoring oil liquid temperature; Described fuzzy control model (15), it is a kind of integrated software that hydraulic element and parameter are had the fuzzy control function that has, its function is the hydraulic filtering system to be realized the function of fuzzy control, and the valve opening that can automatically process filtration system is closed, warning and system heating and degassing function;
Step 2: by first level filtering device, carry out single filter
Described first level filtering device comprises: electromagnetic filter (4), solenoid valve (1), warning device (8), fuzzy control model (15); Described electromagnetic filter (4), it is a kind of novel high gradient electromagnetic filter, single filter is carried out in a plurality of parallel connections, with the large molecule of oxidation generation in ferromagnetism corrosion products in the filtering fluid and the hydraulic oil using process; Described solenoid valve (1), it is that a kind of common tool is controlled the flow of fluid and the solenoid valve (1) of flow rate function, is installed near the filler opening position; Described warning device (8), it is a kind of warning device of making according to differential pressure characteristics, analyzes, judges whether to surpass threshold value by fuzzy control model (15), when surpassing threshold value, closes the with it solenoid valve (1) of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device (8) was reported to the police and is stopped to filter;
Step 3: by two-stage filter, carry out cascade filtration
Described two-stage filter comprises: motor-drive pump (5), relief valve (6), coarse-grain filtering device (7), solenoid valve (1), warning device (8), fuzzy control model (15); Described motor-drive pump (5), it is a kind of electric fuel punp, for system provides power, a plurality of motor-drive pumps (5) parallel connection forms redundancy, improves reliability; Described relief valve (6), it is the concentric pilot-type relief valves of YF type three joints, is connected in parallel on the two ends of pump, the protection filter core; Described coarse-grain filtering device (7), it is the lower filter of a kind of common filter precision, adopts the parallel connection of a plurality of same sizes, to increase filter area and pollutant holding capability, the large molecule that the larger solid particle in the filtering fluid and fluid oxidation produce; The above each coarse-grain filtering device (7) all links to each other with fuzzy control model (15) with solenoid valve (1), and at every one-level filtrating equipment warning device (8) is installed, analyze, judge whether to surpass threshold value by fuzzy control model (15), when surpassing threshold value, close the with it solenoid valve (1) of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 4: by three-level filter device, carry out three-stage filtration
Described three-level filter device comprises: motor-drive pump (5), relief valve (6), accurate filter (10), solenoid valve (1), warning device (8), fuzzy control model (15); Described accurate filter (10), it is a kind of common higher filter of filter precision, its filter core adopts long fibre, in-depth filtration structure, make through the high density HIGH PRESSURE TREATMENT, with the parallel connection of a plurality of same sizes, to increase filter area, improve its reliability; Above-mentioned each accurate filter (10) all links to each other with fuzzy control model (15) with solenoid valve (1), and one, two and three-level filter device warning device (8) is installed, analyze, judge whether to surpass threshold value by fuzzy control model (15), when surpassing threshold value, close the with it solenoid valve (1) of series connection; Otherwise, do not act on; After all solenoid valves all cut out, warning device was reported to the police and is stopped to filter;
Step 5: open outlet valve, remove the gaseous impurity of fluid
Described outlet valve (10), it is a kind of common outlet valve, is installed in after filtrations at different levels finish, and eliminates the bubble that produces in the filter process, is judged by fuzzy control model (15) analysis, if moisture content is many in the fluid, then opens outlet valve, otherwise, close;
Step 6: by oil-water separation system, remove moisture in the fluid
Described oil-water separation system comprises: oily-water seperating equipment (12), tank (13), fuzzy control model (15); Described oily-water seperating equipment (12), it is a kind of common oily-water seperating equipment, links to each other with fuzzy control model (15), if moisture content is high by analysis, then closes bypass solenoid valve (1), and the oil after purifying is carried out oil-water separation; To a certain specified value, then open bypass solenoid valve (1) when low; Described tank (13), it is a kind of common tank, links to each other with oily-water seperating equipment, collects the waste water that produces in the oil water separation process;
Step 7: adopt the contamination particle counter, Real-Time Monitoring fluid lustration class
Described contamination particle counter (11), but it is the particle collector of the granule number of different size pollutant in a kind of common real time on-line monitoring fluid, link to each other with fuzzy control model (15), purify the rank requirement when reaching requirement, close the solenoid valve (1) of return tube, open the solenoid valve (1) of oil exit pipe, the fluid after the filtration flows into fuel tank (14), otherwise, continue circularly purifying.
2. the filter purification method of a kind of hydraulic oil according to claim 1 is characterized in that: in a plurality of parallel connections of the electromagnetic filter described in the step 2 (4), refer to the parallel connection of 3～5 electromagnetic filters (4).
3. the filter purification method of a kind of hydraulic oil according to claim 1 is characterized in that: in a plurality of parallel connections of the motor-drive pump described in the step 3 (5), refer to the parallel connection of 2 motor-drive pumps (5).
4. the filter purification method of a kind of hydraulic oil according to claim 1, it is characterized in that: coarse-grain filtering device (7) parallel connection at a plurality of same sizes of employing described in the step 3 refers to adopt the parallel connection of 3～5 coarse-grain filtering devices (7).
5. the filter purification method of a kind of hydraulic oil according to claim 1 is characterized in that: adopt the parallel connection of a plurality of same sizes at the accurate filter described in the step 4 (10), refer to adopt the parallel connection of 3～5 accurate filters (10).
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| CN201310196739.XA CN103321988B (en) | 2013-05-24 | 2013-05-24 | A kind of filter purification method of hydraulic oil |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105251788A (en) * | 2015-10-24 | 2016-01-20 | 江阴科玛金属制品有限公司 | Cyclic utilization method and device of cold rolling system lubricating oil |
| CN105889233A (en) * | 2016-05-31 | 2016-08-24 | 广州大陈精工电子科技有限公司 | High-pressure device and method for purifying hydraulic oil |
| CN106194904A (en) * | 2016-09-29 | 2016-12-07 | 安徽合力股份有限公司 | A kind of hydraulic transmission box testing stand uses filter online |
| CN106621529A (en) * | 2017-03-02 | 2017-05-10 | 龙岩市海特叉车有限公司 | Centrifugal automatic oil liquid filtering and circulating device |
| CN108479154A (en) * | 2018-06-21 | 2018-09-04 | 农业部规划设计研究院 | The continuous dust removal by filtration system and method for pyrolysis oil high pressure |
| CN109882473A (en) * | 2019-03-19 | 2019-06-14 | 首钢集团有限公司 | A kind of hydraulic system pollution balance control method |
| CN111875182A (en) * | 2020-08-07 | 2020-11-03 | 南京天河水环境科技有限公司 | Micro-polluted water treatment system |
| CN112807840A (en) * | 2020-12-31 | 2021-05-18 | 飞潮（无锡）过滤技术有限公司 | Recovery of Fe3O4Nano particle filtering and separating system and method |
| CN114636809A (en) * | 2022-03-15 | 2022-06-17 | 西安热工研究院有限公司 | Oil particle pollutant on-line monitoring and processing method |
| CN114962099A (en) * | 2021-12-22 | 2022-08-30 | 中国船舶重工集团公司第七一一研究所 | High-power diesel engine fuel oil pretreatment system |
| CN115111517A (en) * | 2022-06-16 | 2022-09-27 | 九江七所精密机电科技有限公司 | Oil liquid filtering device with online monitoring function and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105251788A (en) * | 2015-10-24 | 2016-01-20 | 江阴科玛金属制品有限公司 | Cyclic utilization method and device of cold rolling system lubricating oil |
| CN105889233A (en) * | 2016-05-31 | 2016-08-24 | 广州大陈精工电子科技有限公司 | High-pressure device and method for purifying hydraulic oil |
| CN106194904A (en) * | 2016-09-29 | 2016-12-07 | 安徽合力股份有限公司 | A kind of hydraulic transmission box testing stand uses filter online |
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| CN111875182B (en) * | 2020-08-07 | 2023-07-04 | 南京天河水环境科技有限公司 | Operation method of micro-polluted water body treatment system |
| CN112807840A (en) * | 2020-12-31 | 2021-05-18 | 飞潮（无锡）过滤技术有限公司 | Recovery of Fe3O4Nano particle filtering and separating system and method |
| CN114962099A (en) * | 2021-12-22 | 2022-08-30 | 中国船舶重工集团公司第七一一研究所 | High-power diesel engine fuel oil pretreatment system |
| CN114636809A (en) * | 2022-03-15 | 2022-06-17 | 西安热工研究院有限公司 | Oil particle pollutant on-line monitoring and processing method |
| CN115111517A (en) * | 2022-06-16 | 2022-09-27 | 九江七所精密机电科技有限公司 | Oil liquid filtering device with online monitoring function and method |
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| CN103321988B (en) | 2016-01-27 |
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