A filter unit for removing impurities and moisture in impure oil by pressure filtration or vacuum evaporation pressure filtration is adopted. The oil filter is mainly used to improve the insulation performance and the purity of the lubricating oil. Oil filter is divided into two types: general oil filter and vacuum oil filter.

The ordinary oil filter is composed of a primary filter, an oil pump and a filtration device. The primary filter is a tube shaped metal mesh, which prevents the larger solid particles in the impure oil from entering the oil pump. Oil pumps are usually used as gear pumps to transport pure oil into the filter. The filter device is a small manual compression plate and frame filter press, and uses special filter paper as filter medium. The impure oil enters the plate and frame filter press under the pressure of the oil pump and filters the oil through the filter paper. The solid impurities in the oil are trapped on the surface of the filter paper, and a small amount of water is absorbed by the pores of the filter paper. The filter pressure is usually not more than 0.3 MPa. When the filter paper is deposited on the surface of the filter, the filter pressure rises to 0.35 MPa, or when the moisture absorption of the filter paper is close to saturation and the residual moisture in the filter oil is no longer reduced, the filter paper should be replaced. When the viscosity of the oil is high, it can be preheated to reduce viscosity and then filter. This filter can only remove solid impurities and a small amount of moisture, which is suitable for the purification of general electric appliances and lubricants. When the oil contains too much moisture and impurities, it must be pretreated and sent to the oil filter. The processing quantity of the ordinary oil filter is 25~200 liters / points. The square filter frame of the filter device has 200 millimeters, 250 millimeters, two kinds of inner side length. The filter plate and filter frame are made of cast iron or polypropylene.

The vacuum oil filter includes primary filter, vacuum evaporation tank, oil pump, filter device, condenser (condenser) and vacuum pump. Under the action of atmospheric pressure, the impure oil enters the vacuum evaporation tank through the primary filter. The oil is heated to more than 100 C and then injected into the vacuum chamber to become tiny droplets. The moisture in the oil is quickly evaporated into steam and discharged into condensers after condensation. Uncondensed water vapor is discharged into the atmosphere by a vacuum pump. The oil collected at the bottom of the vacuum evaporation tank and evaporated and dehydrated is sent to the filtering device by the oil pump, and the solid impurities in the oil are filtered to further absorb the trace moisture. The vacuum oil filter can significantly improve the effect of removing moisture from oil and is suitable for the purification of high voltage electrical appliances.

VFD insulating oil double stage vacuum oil filter

II. Application scope

VFD series insulating oil double stage vacuum oil filter is widely used in power stations, power plants, electric power companies, power transformer industry and other power departments, as well as metallurgical, petrochemical, mine and other industrial and mining enterprises. It is suitable for vacuum filtration and purification of heavy oil, such as ultra high voltage transformer oil (above 110KV main transformer), new oil, imported oil, transformer oil and capacitor oil of transformer system and refrigeration oil. It can also be used in vacuum oil injection and drying of transformer.

III. product description

The main function of the VFD series insulating oil double stage vacuum filter is to remove the trace moisture, gas, mechanical impurities and free carbon in the insulating oil, and improve the characteristics of the insulating oil.

The VFD series insulation oil two-stage vacuum oil purifier includes vacuum flash drying technology, coalescence separation technology and "step by step density filtration technology". This series of two-stage vacuum system can more efficiently remove the harmful gases such as water, impurities and hydrocarbons in oil, improve the flash point and pressure strength of the insulating oil. It can accelerate the acid removal, decolorization, reduce the dielectric loss and acid value in parallel with the waste oil regeneration device, thus further improving the insulation strength of the oil.