CN103321988A - Method for filtering and purifying hydraulic oil - Google Patents

Abstract

A method for filtering and purifying hydraulic oil. The steps are as follows: (1) Apply an electric heating system to heat the oil, and first heat the oil to 60°C; (2) Perform a primary filter through a primary filter device. High-gradient electromagnetic filters, multiple in parallel, perform primary filtration to filter out ferromagnetic corrosion products in the oil and macromolecules produced by oxidation during the use of hydraulic oil; (3) carry out secondary filtration through the secondary filter device, Eliminate larger solid particles; (4) Through a three-stage filter device, common filters with relatively high filtration precision are used in parallel to form redundancy and filter; (5) Open the exhaust valve to remove gas impurities in the oil, Installed after all levels of filtration are completed to eliminate the air bubbles generated during the filtration process; (6) Remove water in the oil through the oil-water separation system; (7) Use the pollution particle counter to monitor the cleanliness level of the oil in real time, when the required purification level is reached If required, close the solenoid valve of the oil return line.

Description

A method for filtering and purifying hydraulic oil

technical field

This article relates to a hydraulic oil filtration and purification method, specifically involving the use of magnetic filtration, coarse filtration and precision filtration three-stage redundant cycle filtration method to obtain oil of required cleanliness level. The pollution sources of hydraulic oil mainly include: solid particles, water, air, macromolecules produced by oxidation, etc. The industrial waste hydraulic oil pollutants are filtered through this method, and fuzzy control is realized, which is used to purify hydraulic components and systems. Contaminated oil can be reused. The method adopts fuzzy control module, which can realize automatic control. The filtering method has the advantages of low cost, short time, long service life, high reliability, automatic control, etc., and belongs to the technical field of auxiliary facilities for aerospace, automobiles, and machine tools.

Background technique

Compared with the traditional filtration method, the filter combination method has the advantages of higher filtrate precision and simple structure. With the continuous deepening of research work, the deficiencies and weaknesses of the filtration combination method are gradually exposed, such as short life, low reliability, low filtration efficiency, and inability to realize automation. At the same time, multi-stage filtering methods and intelligent filtering methods have been developed and applied, and multi-stage filtering methods have the characteristics of high filtering accuracy. The intelligent filter can realize automatic control, does not rely on people, and has the characteristics of high filtration efficiency.

The existing multi-stage filtration method is a three-stage filtration method, such as "Hydraulic Oil Purification System" with application number CN200320124413, which proposes a multi-stage purification method, but there are shortcomings such as no automatic control, frequent cleaning, and short life. The "intelligent control combined oil purification device" with application number 2012201811044 designed an intelligent control, but the filtration precision is not high enough, the service life is short, and the filtration efficiency is low. Fuzzy control modules rarely appear in hydraulic oil filtration systems, so the present invention proposes a fuzzy control method for three-stage redundant cycle filtration.

Contents of the invention

a. The purpose of the invention

The object of the present invention is to provide a method for filtering and purifying hydraulic oil, which is a method for purifying contaminated oil in hydraulic components and systems, and has the characteristics of three-stage redundant cycle filtering with fuzzy control function. The method has the advantages of high reliability, long life, high purification efficiency, automatic control and the like.

b.Technical solution

A kind of filter purification method of hydraulic oil of the present invention, its steps are as follows:

Step 1: Apply electric heating system to heat the oil

The electric heating system includes: an electric heater 2 , a thermometer 3 and a fuzzy control module 15 . The electric heater 2 is a common temperature-adjustable electric heater with the function of heating oil, which is installed near the oil inlet and connected to the fuzzy control module 15 . First, the oil is heated to 60°C; the thermometer 3, which is a common thermometer with a range of 0°C to 100°C, is installed at the outlet of the electric heater 2 to monitor the change of the oil temperature; the fuzzy control Module 15, it is an integrated software with fuzzy control function for multiple hydraulic components and parameters. Its function is to realize the function of fuzzy control for the hydraulic filtration system, and it can automatically handle the opening and closing of the valve of the filtration system, alarm and system Heating, exhaust and other functions;

Step 2: Pass through a primary filter device for primary filtration

The primary filtering device includes: an electromagnetic filter 4 , an electromagnetic valve 1 , an alarm device 8 , and a fuzzy control module 15 . The electromagnetic filter 4 is a new type of high-gradient electromagnetic filter, which adopts multiple parallel connections (generally 3 to 5 electromagnetic filters in parallel) for primary filtration to filter out ferromagnetic corrosion products and Macromolecules produced by oxidation during the use of hydraulic oil; the solenoid valve 1, which is a common solenoid valve 1 with the function of controlling the flow and velocity of oil, is installed near the oil inlet; the alarm device 8 , it is a kind of alarm device made according to the differential pressure characteristic, through the fuzzy control module 15 analysis, judges whether to exceed the threshold value, when exceeding the threshold value, close the solenoid valve 1 connected in series with it; otherwise, it does not work; when all solenoid valves After both are closed, the alarm device will alarm and stop filtering;

Step 3: Through the secondary filter device, perform secondary filtration

The secondary filtering device includes: an electric pump 5 , an overflow valve 6 , a coarse filter 7 , a solenoid valve 1 , an alarm device 8 , and a fuzzy control module 15 . The electric pump 5 is an electric fuel pump that provides power for the system. Multiple electric pumps are connected in parallel (generally two electric pumps are connected in parallel) to form redundancy and improve reliability; the overflow valve 6 is It is a YF three-section concentric pilot relief valve (pipe type), which is connected in parallel at both ends of the pump to protect the filter element; the coarse filter 7 is a common filter with relatively low filtration accuracy, and adopts multiple filters of the same specification Parallel connection (usually 3 to 5 coarse filters in parallel) to increase the filtration area and dirt holding capacity, and filter out larger solid particles in the oil and macromolecules produced by oil oxidation. Each coarse filter 7 described above is all connected with solenoid valve 1 and fuzzy control module 15, and warning device 8 is installed on each level of filtering device, by fuzzy control module 15 analysis, judge whether exceed threshold value, when exceed threshold value, Close the solenoid valve 1 connected in series; otherwise, it has no effect; when all the solenoid valves are closed, the alarm device will alarm and stop filtering;

Step 4: Through the three-stage filter device, perform three-stage filtration

The three-stage filtering device includes: an electric pump 5 , an overflow valve 6 , a precision filter 10 , a solenoid valve 1 , an alarm device 8 , and a fuzzy control module 15 . The precision filter 10 is a common filter with relatively high filtration accuracy. Its filter element adopts long-fiber, deep-layer filter structure, and is made by high-density and high-pressure treatment. ~5 precision filters in parallel) to increase the filtering area and improve its reliability; each of the above-mentioned precision filters 10 is connected with the solenoid valve 1 and the fuzzy control module 15, and on the first, second and third filter devices Alarm device 8 is installed, by fuzzy control module 15 analysis, judges whether exceed threshold value, when exceeding threshold value, close the electromagnetic valve 1 connected in series with it; ;

Step 5: Open the exhaust valve to remove gas impurities in the oil

Described exhaust valve 10, it is a kind of common exhaust valve, is installed after each level of filtration is finished, eliminates the air bubble that produces in the filtration process, is analyzed and judged by fuzzy control module 15, if the water content is much in the oil, then Open the exhaust valve, otherwise, close it;

Step 6: Remove the water in the oil through the oil-water separation system

Described oil-water separation system comprises: oil-water separation device 12, water tank 13, fuzzy control module 15; Described oil-water separation device 12, it is a kind of common oil-water separation device, links to each other with fuzzy control module 15, if compare through analysis moisture content When the value is high, the bypass solenoid valve 1 is closed to separate the purified oil from water; when the value is low, the bypass solenoid valve 1 is opened; the water tank 13 is a common water tank that is separated from oil and water The separation device is connected to collect the waste water generated during the oil-water separation process;

Step 7: Use the pollution particle counter to monitor the cleanliness level of the oil in real time

The pollution particle counter 11 is a common particle counter that can monitor the number of particles of different sizes of pollutants in the oil in real time. Valve 1, open the solenoid valve 1 of the oil discharge pipe, the filtered oil flows into the oil tank 14, otherwise, continue to circulate and purify.

c. Beneficial effect

The invention discloses a method for filtering and purifying hydraulic oil. The heated oil is subjected to three-stage redundant circulation filtration of electromagnetic filtration, coarse filtration and fine filtration, and oil-water separation filtration. Parallel redundancy of filters can increase the filtration area and improve filtration efficiency; in addition, when a filter in the system reaches the limit of dirt holding, this method does not need to stop filtering to clean the filter, and can continue to work, which can increase the reliability and efficiency of filtration. efficiency and longevity. Motor redundancy can reduce motor wear, improve motor life, and increase its reliability. The fuzzy control module is connected with electric heaters, filters, alarm devices, solenoid valves, pollution particle counters, etc., which can realize online automatic detection, fuzzy control and other functions, and can obtain the required standard oil efficiently and reliably. In addition, according to the pollution control equation, the obtained downstream pollution concentration-time curve can estimate the purification time of the required clean grade oil. The oil outlet pipe and the oil return pipe are equipped with protection and alarm devices and detection methods to monitor the oil quality of the filter system and protect the filter element from damage, which can reduce unnecessary economic losses. The advantages and effects of the present invention are: the mechanism can realize high-efficiency filtration, and the filtration system has a long service life, can realize automatic control, high reliability, large pollutant holding capacity, and high purification efficiency, and can also realize time estimation.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the purification method of the present invention.

Fig. 2 is a flow chart of the purification method of the present invention.

Fig. 3 is a software flow diagram in the fuzzy control module of the present invention.

In the figure: 1. Electromagnetic valve 1, 2. Electric heater, 3. Thermometer, 4. Electromagnetic filter, 5. Electric pump, 6. Overflow valve, 7. Coarse filter, 8. Alarm device, 9. Exhaust Air valve, 10, precision filter, 11, pollution particle counter, 12, oil-water separation method, 13, water tank, 14, oil tank, 15, fuzzy control module.

Detailed ways

The present invention is used in the purification method of hydraulic components and system polluted oil, the filter device used is shown in Figure 1, and the specific purification process is shown in Figure 2: the method will be further described in detail in conjunction with the accompanying drawings.

Step 1: Apply electric heating system to heat the oil

The electric heating system includes: an electric heater 2 , a thermometer 3 and a fuzzy control module 15 . The electric heater 2, which is a common temperature-adjustable electric heater with the function of heating oil, is installed near the oil inlet and connected to the fuzzy control module 15; the fuzzy control module 15 , it is an integrated software with fuzzy control function for multiple hydraulic components and parameters. The filter system realizes the function of fuzzy control, and can automatically handle functions such as valve opening and closing, alarm and system heating, exhaust of the filter system, and the software flow diagram in this fuzzy control module is as shown in Figure 3; said thermometer 3, which is A common thermometer with a range of 0°C to 100°C, installed at the outlet of the electric heater 2, to monitor the change of oil temperature;

Step 2: Pass through a primary filter device for primary filtration

The primary filtering device includes: an electromagnetic filter 4 , an electromagnetic valve 1 , an alarm device 8 , and a fuzzy control module 15 . The electromagnetic filter 4 is a new type of high-gradient electromagnetic filter, three of which are connected in parallel for one-stage filtration to filter out ferromagnetic corrosion products in the oil; the electromagnetic valve 1 is a common The solenoid valve 1 that controls the flow and flow velocity function of the oil is installed near the oil inlet; the alarm device 8 is an alarm device made according to the differential pressure characteristic, and is analyzed by the fuzzy control module 15 to determine whether Exceeding the threshold value, when the threshold value is exceeded, the solenoid valve 1 connected in series is closed; otherwise, it does not work; when all the solenoid valves are closed, the alarm device alarms and stops filtering;

Step 3: Through the secondary filter device, perform secondary filtration

The secondary filtering device includes: an electric pump 5 , an overflow valve 6 , a coarse filter 7 , a solenoid valve 1 , an alarm device 8 , and a fuzzy control module 15 . The electric pump 5 is an electric fuel pump that provides power for the system. Two electric pumps are connected in parallel to form redundancy and improve reliability; the relief valve 6 is a YF three-section concentric pilot relief valve. The valve (pipe type) is connected in parallel at both ends of the electric pump 5 to protect the filter element; the coarse filter 7 is a common filter with relatively low filtration accuracy, and three coarse filters 7 of the same specification are connected in parallel, To increase the filter area and dirt holding capacity. Each coarse filter 7 described above is all connected with solenoid valve 1 and fuzzy control module 15, and warning device 8 is installed on each level of filtering device, by fuzzy control module 15 analysis, judge whether exceed threshold value, when exceed threshold value, Close the solenoid valve 1 connected in series; otherwise, it has no effect; when all the solenoid valves are closed, the alarm device will alarm and stop filtering;

Step 4: Through the three-stage filter device, perform three-stage filtration

The three-stage filtering device includes: an electric pump 5 , an overflow valve 6 , a precision filter 10 , a solenoid valve 1 , an alarm device 8 , and a fuzzy control module 15 . The precision filter 10 is a common filter with relatively high filtration precision. Its filter element adopts long fiber and deep filter structure, which is made through high-density and high-pressure treatment. Three of the same specifications are connected in parallel to increase Large filter area improves its reliability; each of the above-mentioned precision filters 10 is connected to the solenoid valve 1 and the fuzzy control module 15, and an alarm device 8 is installed on the first, second and third filter devices, and is analyzed by the fuzzy control module 15 1. Judging whether the threshold value is exceeded, when the threshold value is exceeded, the solenoid valve 1 connected in series is closed; otherwise, it does not work; when all the solenoid valves are closed, the alarm device alarms and stops filtering;

Step 5: Open the exhaust valve to remove gas impurities in the oil

The exhaust valve 10, which is a common exhaust valve, is installed after each level of filtration is completed to eliminate the air bubbles generated during the filtration process. It is analyzed by the fuzzy control module 15. If there is a lot of water in the oil, it will be opened. The exhaust valve, on the contrary, closes;

Step 6: Remove the water in the oil through the oil-water separation system

Described oil-water separation system comprises: oil-water separation device 12, water tank 13, fuzzy control module 15; Described oil-water separation device 12, it is a kind of common oil-water separation device, links to each other with fuzzy control module 15, if compare through analysis moisture content When the value is high, the bypass solenoid valve 1 is closed to separate the purified oil from water; when the value is low, the bypass solenoid valve 1 is opened; the water tank 13 is a common water tank that is separated from oil and water The separation device is connected to collect the waste water generated during the oil-water separation process;

Step 7: Use the pollution particle counter to monitor the cleanliness level of the oil in real time

The pollution particle counter 11 is a common particle counter that can monitor the number of particles of different sizes of pollutants in the oil in real time. Valve 1, open the solenoid valve 1 of the oil discharge pipe, the filtered oil flows into the oil tank 14, otherwise, continue to circulate and purify.

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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