The purpose and principle of lubricating oil filter 1. The purpose of filtration is to separate solids from liquids through a medium to achieve solid-liquid separation, which is called filtration. According to the operating characteristics of lubricating oil, the purpose of lubricating oil filtration is to control the size and number of mechanical particles in a unit volume.
2. Filtration principle The basic principle of filtration is that under the action of pressure difference, the liquid in the suspension passes through the permeable medium (filtration medium), and the solid particles are trapped by the medium, so that the liquid and solid are separated. The commonly used filtration methods can be divided into gravity filtration, vacuum filtration, pressure filtration, and centrifugal filtration. The filter media is divided into filter cake filtration and deep filtration.The filter cake is used as an external filter.Usually, the suspension with a higher concentration (volume concentration> 1%) is filtered.Deep filtration is the solid particles trapped in the pores inside the medium. The fine solid particles are separated from the very thin suspension. Under the condition of similar efficiency, the initial pressure of the deep filter is generally higher than that of the external filter, and the pressure drop will gradually increase as the collected particles increase.
Selection of lubricating oil filter The classification and characteristics of filter media are based on the filtration principle, and the filter materials are divided into two types: surface type filtration and depth type filtration. Appearance-type filter media can be cleaned and reused, accurate filtration, small capacity is not suitable for systems with high impurity content, is not suitable for filtration of soft or fiber impurities, the pressure drop changes linearly; and deep-type filtration The medium has discarded after use, nominal filtration, large capacity and long service life. It is suitable for filtering various impurities such as hard, soft or fiber. It can maintain a certain flow for a long time. The rapid decrease of traffic.