Is the filter filter more accurate?

Introduction: As an oil filter manufacturer, it is often faced with a problem that customers will mention when selecting various types of oil purification equipment. What is your precision? I want high precision, the higher the better! So, the accuracy of the filter really is the better?

In fact, a single consideration for the use of high-precision filters to control pollution not only increases the manufacturing cost of the system, but also indirectly shortens the service life of the filter element. The national standard GB/T20079-2006 stipulates that the filtration capacity of the filter is expressed by the filtration ratio βx(c), which is defined as: the unit volume of oil upstream and downstream of the filter is greater than a given size x (c ) The ratio of the number of contaminant particles. In other words, if a filter of 10 μm is used, it does not mean that there is no more than 10 μm of contaminants downstream of the filter; at the same time, because of the difference in the value of the filter ratio βx (c), the filter manufacturer is also hydraulic. Industry waste and one of the reasons that can not effectively control system performance. At present, the localization of filter elements has become a general trend, and as soon as possible, unified standards and effective implementation have become an urgent task for the industry.

It is worth mentioning that many people think that the filter can be reused after cleaning and washing. Strictly speaking, this is a totally wrong view, no matter what kind of material, regardless of the material structure, how much flushing will change the filtration gap of the filter material. Practically speaking, this is also the spirit of the definition of filtering than βx(c). Due to the pressure difference when passing through the filter, it is unavoidable that relatively large particles pass through a relatively small filter gap, and even if the material is regained better, the long-term (similar to the flush filter) will enlarge the gap. In other words, the filter element no longer matches this system. Some people have to ask, since the filter can not be reused, why there are filter washing equipment in the market, there is a backwash circuit in the design? In fact, this is also very simple, under normal circumstances the market can flush the filter and backwash circuit for the water medium system, this type of system is not very strict for the cleanliness control requirements, and occasionally seen in the case of hydraulic medium-based systems, There are also parallel filters (one for one), which means that the circuit itself takes into account aging and pressure differences. In fact, the market can backwash the filter cartridge is rare, because the backwashing means that both sides of the filter must be able to withstand a certain pressure difference, the current such components are more common in coal mining machinery, the common filter on the market can not "Backwash" (Part of the suction filter can be reused by air purging). In fact, there is only one criterion for whether or not the filter element can be reused, that is, whether its continued use can still meet the established cleanliness goals.

At present, many people (mainly end users) still judge the performance of the filter by the filter's service life. Many users judge the filter by the filter's service life/blocking speed because there is no oil contamination detection device. Performance of the pros and cons.

This concept is one-sided, it should be said that the filter filter is not standardized due to the localization of the filter element and the model of the filter. The filter of the market mainly has three identification parameters: brand, filtering accuracy, and nominal flow. From the GB/T20079-2006 regulations, it is not difficult to see that when selecting filters, the performance requirements in the following aspects should be taken into consideration: The oil-passing capacity is large enough and the pressure loss is small; the filter accuracy should meet the design requirements; the filter element has sufficient strength And pollution capacity; filter corrosion resistance, long-term work in the specified environment; filter replacement, cleaning and maintenance convenience. In other words, the key parameter β value is not reflected in the filter model. Therefore, it should be clearly marked in the instructions of hydraulic equipment.

Numerous experiences and lessons have taught us that different precision filters are suitable for different occasions, and different occasions require flexible combinations of different precision filters. In a relatively complex system, organic combinations of filters with different properties and different functions can effectively control the cleanliness of the system, and can be understood or exaggerated in a single piece, without any theoretical basis and practical basis.

Source: Chongqing Tongrui Filtration Equipment Manufacturing Co., Ltd.