The vacuum oil filter has a wide range of applications in the field treatment of production oil, such as: transformer oil, turbine oil, machine oil, switch oil, transformer oil and other oils. After the industrial oil is used for a period of time, there will be water pollution and particle pollution in the oil, which will accelerate the deterioration of the oil, accelerate the metal fatigue, aggravate the wear of the hydraulic components, and cause the insulating oil to lose the dielectric strength. The vacuum oil filter can dynamically process the oil without stopping production, reduce production and operation costs, prevent the burning and discharge of waste oil, and avoid the resulting environmental pollution. At present, there are many manufacturers of such oil purifiers in my country, but their technical level is not high. Compared with foreign oil purifiers of the same specification, there is a big gap. There are high energy consumption, unreasonable structure, and messy shape. Problems such as low oil treatment accuracy.
After conducting extensive research on the oil filter industry at home and abroad, we designed the RC vacuum heating oil processor. In this article, I will introduce the RC oil treatment machine and the research results to everyone, hoping to make a meager effort to improve the technical level of my country's oil filter industry.
2 System function and structure introduction
2.1 Inlet filter system: It is composed of coarse filter, fine filter and special filter.
Its role is to filter the oil in advance. Coarse filter 40-100μ, fine filter 20-40μ, special filter 20-40μ. The special filter is set according to the special requirements of users, such as adding a chemical inlet to remove the acidity or alkalinity of the oil; using line gap or glass brazing filter cloth structure to eliminate oil foam. The selector valve should be closed when in use.
2.2 Vacuum pumping system: it is composed of vacuum pump, water separator, one-way valve and cooler.
Its function is to pump the vacuum tank to a vacuum negative pressure (usually 380~610 mmHg or lower), so that the water in the oil can volatilize at a lower temperature; the pumped water vapor passes through the cooler and the water separator Condensation and precipitation; the one-way valve prevents the vacuum pump from reversing. The water separator and check valve cannot use general pneumatic components, but must use pneumatic components suitable for working under negative pressure. The cooler is generally a tower structure with a large volume, and is equipped with multi-faceted hollow polypropylene plastic balls with good hydrophilicity, high temperature resistance, corrosion resistance, and large total wet specific surface area. The hot and humid gas drawn from the vacuum tank enters the tower obliquely along the tangential direction of the tower wall, the flow rate slows down sharply and forms a downward vortex airflow. After encountering the polypropylene plastic ball, the flow rate further slows down and quickly condenses into water droplets.
2.3 Vacuum destruction system: It is composed of air inlet valve, filter drier and vacuum destruction valve.
Its role is to supplement air and reduce vacuum. Under vacuum negative pressure, the water vapor content is easy to be saturated and difficult to extract. The air should be replenished periodically to destroy the saturation of water vapor, so that the water vapor is constantly volatilized in the vacuum tank for easy extraction. The on-off of the vacuum breaking valve is controlled by the signal of the liquid level controller. Dry filters are used in areas with high filtration accuracy and high humidity in the air. Dry filters such as calcium chloride, caustic soda, caustic potassium, silica gel, aluminum glue, etc. are added to the filter to remove the humidity of the supplemented air.
2.4 Vacuum spray system: consists of heater, vacuum tank, sprayer, temperature controller and liquid level gauge.
Its function is to heat the oil to a certain temperature, and then spray the oil, so that the free water, emulsified water and dissolved water in the oil volatilize in the vacuum tank. The heater has a snake-shaped armored heating tube to heat directly in the tank, which has a higher thermal efficiency; a multi-straight tube series heating method, which is commonly used because it is easy to maintain the heating tube. Box-type far-infrared heating method, the oil is evenly heated in this way, and the oil will not produce carbides and reduce the entropy change of the oil performance due to contact with the high-temperature heating tube. The sprinkler is a sprinkler or sprinkler pipe with small holes of φ1~φ2 evenly. The small holes are easy to be blocked, so the sprinkler should be easy to disassemble. After the oil temperature is measured at the temperature control point, the heater is switched on and off by the thermostat to control the oil temperature between 45 oC and 75 oC. The liquid level controller has a float type, a float sensor outside the tank and an infrared control type. The liquid level is set with 4 control points. The upper limit position stops the vacuum pump to prevent oil from entering the vacuum pump; the lower limit position stops the oil pump to prevent the oil pump from emptying; the middle upper position opens the vacuum break valve, the middle lower position closes the vacuum break valve, generally only set Two positions, upper middle and lower middle. The vacuum tank is the heart of the oil filter. It has a large volume and is filled with a certain height of hydrophilic and corrosion-resistant fillers, such as polypropylene plastic balls, to accelerate the volatilization of water. Foreign Pall company set up a high-speed turntable in the vacuum chamber, using centrifugal force to make each unit volume of oil have a huge surface area to increase the water removal rate without heating.
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