How to choose the best lubricant filter

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How to choose the best lubricant filter

Date: 2020-02-15

1. Classification and characteristics of filter media

According to the filtration principle, the filter material is divided into two types: surface type filtration and depth type filtration. Surface-type filter media can be cleaned and reused, and must be filtered. It has a small capacity and is not suitable for systems with high impurity content. It is not suitable for filtering soft or fiber impurities, and the pressure drop changes linearly. The medium has to be 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, but the pressure drop rapidly increases when it reaches a certain use time. Features of rapid traffic decline.

2.Filtration accuracy

Filtration accuracy refers to the size of the pore diameter of the lubricating oil filter element. When a solution containing impurities passes through the filter, the size of the large particles allowed by the filter is usually indicated by the mesh number of the filter or the diameter of the filter hole.

The filtration accuracy does not fully indicate the filtering function of the lubricating oil filter, that is, the pore size cannot indicate the degree of filtration, and the filtration power (or filtration ratio) must also be considered. According to the filtration power, the filtration accuracy is divided into positive accuracy and nominal accuracy. Because in the filtration profession, no filter media can reach 100% filtration, and the so-called positive accuracy in the profession usually refers to a removal rate of more than 99.9%, and the filtering effect can be continuously reproduced, mostly referring to films and a few dense fiber structures. Filter media is generally more expensive. The concept of nominal accuracy means that the filtering power will change with the change of working conditions, and a stable and stable removal rate cannot be reached. Multi-finger filters such as fibers or non-woven fabrics are generally pre-filtered at the front end and lowered at the back end. The cost of fine filtering.

3. Filter life

Filter life is related to lubricant viscosity, impurity content and flow. It is worth mentioning that reducing the load of each filter element as much as possible, that is, increasing the number of filter elements in parallel can improve the life of the filter element.

Assume that the life of one depth-type filter is 1. If you use N filters to filter, the total life is 0.7 z N2, then the life of each filter is 0.7 z N / N, assuming N is equal to 2, with According to people's calculations, the life of each filter element is 0.7z22 / 2 = 1.4, that is, the life of the filter element has been improved by 40%.

4.Selection of lubricating oil filters

Lubricating oil filter selection is not as good as Zui, only Zui is suitable. When selecting, we must first consider technical feasibility, including chemical compatibility (mainly special oils and related products, such as stainless steel raw materials for antifreeze lubricant filters), filtration accuracy, operating conditions, etc .; also consider economic feasibility, including intermittent Or continuous, number of filter elements, precision matching, etc. Specifically consider 11 factors such as filtration accuracy, impurity characteristics, impurity quantity, flow rate, lubricating oil viscosity, operating / design pressure, operating temperature, differential pressure, connection scale / type, structural materials and special requirements.