What is a filter? What are the disadvantages

What is a filter have you heard of it? Simply put, it is a kind of accessory for filtering impurities and gas, mainly used in the engine of the car. We understand a product not only to understand its advantages, but also to understand its disadvantages. The following Xiaobian sorted out the two disadvantages of the filter for you.

Disadvantage one: filter 60% of the impurities in the oil, low filtration efficiency;

This is because of the existing oil filter, is to rely on a single paper filter hole to intercept and filter out the harmful impurities in the oil, the smaller the filter paper microhole is, the better the filtering effect is, but the oil through the ability is worse. In order to solve in the same filter paper micro hole can filter out the smallest particles of impurities, but also can make the engine supply enough oil through the micro hole this contradiction. According to the filter branch of the National Internal Combustion Engine Industry Association, the best oil filter on the market can only be designed to remove 60% of the impurities in the oil, which is the maximum filter value obtained after thousands of experiments. In actual use, there are 40% harmful impurities, which can not be effectively removed by the paper filter element. Among the 40% impurities, because the ferromagnetic impurities are relatively small and hard, most of them are ferromagnetic impurities, which will cause greater damage to the engine.

Disadvantages two: under special conditions, the filtration efficiency is zero;

At the bottom of the paper filter element are provided with bypass valve, which is in the design, in order to take into account the engine in the cold start oil viscosity or paper filter element is partially blocked or all blocked, to ensure that the oil can be smoothly recycled back to the engine and the design of direct oil flow channel. When the oil opens the bypass valve under the pressure of the oil pump, the oil circulating back to the engine through the bypass valve is not only not filtered by the paper filter, but also the large particle impurities that have been filtered by the paper filter will be flushed back to the engine through the bypass valve, bringing uninterrupted secondary wear to the engine. From the above two shortcomings can be seen that the impurities greater than or less than the paper filter element microhole play a permanent filtration effect, can only be equal to the paper filter element microhole and embedded into the paper filter element microhole impurities play a permanent filtration effect, so the filtration efficiency is very low.