Scraper Self-Cleaning Filters

Background:

Self-cleaning filter is a new type of filter developed in the late 1970s, which has the advantages of self-cleaning and small pressure loss. At present, several series of products have been developed, such as sewage suction type self-cleaning filter, brush type (scraper type) self-cleaning filter, rotary arm type self-cleaning filter and backwash type self-cleaning filter, among which brush type (scraper type) have obvious advantages when process viscous material, so it is most suitable for the environments with harsh working conditions in industries such as metallurgy, chemical industry, and papermaking.
The brush type (scraper type) self-cleaning filter uses a brush (scraper) to remove the sticky particles on the filter element, so the brush (scraper) is a key component of the brush type (scraper type) self-cleaning filter, and its cleaning effect mainly depends on the structure of the brush (scraper) mechanism.

The scraper is used as the executive element to remove impurities on the filter screen. First of all, it should ensure that the impurities are completely removed. Therefore, it is structurally guaranteed that there is no gap between the scraper and the filter screen during the working process, and the angle between the scraper and the filter screen is 90, so as to prevent impurities from being squeezed into the filter screen under the action of radial force; secondly, it is necessary to ensure that the scraper can operate flexibly during the working process, so the scraper can be expanded and contracted in the radial direction in structure, and there should be no rust and other phenomena. In order to ensure the flexible and accurate operation of the scraper, the structure and motion state of the scraper mechanism should be simplified as much as possible, and a pair of water-lubricated bearings should be used to support the scraper. Rotate around the axis of the screen to remove dirt from the inside of the screen. Our equipment is an adaptive scraper structure, which can automatically adapt to the change of the shape of the filter screen. The sliding rail mechanism and the spring element are used to make the scraper move flexibly in the radial direction to ensure that the scraper and the filter screen are always in a tight relationship during the working process of the filter. The fit state can effectively ensure the cleaning effect, completely remove the debris adhering to the inner surface of the filter screen, so that the filter screen will not be blocked and reduce pressure damage. The position of the scraper is fixed in the axial direction and evenly distributed in the axial direction. It only moves in a circular motion during operation, which ensures the reliability of the scraper operation and evenly removes the debris in each position on the filter screen, reducing pressure loss. Our scraper has a reasonable structure and reliable operation, and can completely remove the debris on the filter screen, especially when the medium contains viscous debris.

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Nina

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