Filter screen two-level self-cleaning filter

Abstract

The invention discloses a filter screen two-level self-cleaning filter. A filter cylinder capable of rotating is arranged in a cylindrical body; a scraper seat and a scraper are arranged in the cylindrical body, wherein the scraper is connected with the periphery of the scraper seat and in sealed connection with the outer wall of the filter cylinder; the inner cavities of the scraper seat and thescraper are communicated with a second-level sewage drainage port; a first-level sewage drainage port is arranged at the bottom of the cylindrical body; a material inlet and a filtrate outlet are respectively arranged at the middle side part and the upper side part of the cylindrical body; when in use, the filtered solid particles are partially scrapped by the scraper and then fall into the first-level sewage drainage port; a few particles enter the inner cavities of the scraper and the scraper seat; and the back-flushed filtrate can rush out the particles attached inside the filter cylinder and discharge the particles from the second-level sewage drainage port. The filter disclosed by the invention has the advantages of compact structure, large processing quantity, long service life and the like, is stable and reliable in operation, realizes continuous filtering as well as two-level self-cleaning and regeneration of a filter screen, and ensures low operation cost.

Description

Technical field: [0001] The invention relates to a filter screen secondary self-cleaning filter. Background technique: [0002] In general filtration devices, as the filtration process progresses, solid phase particles in the liquid are trapped on the surface of the filter element, resulting in an increase in filtration resistance and a decrease in filtration efficiency. At this time, it is generally necessary to interrupt the filtration operation, replace the filter element or take it out for cleaning, which is time-consuming and troublesome, which affects the processing efficiency, especially the continuous operation of the entire process. [0003] In some fields, such as power station auxiliary cooling water, industrial circulating water, fire water, etc., the flow rate is large and the particles are few. Generally, they are solid and crystalline particles such as sand and gravel, which are easy to remove. However, due to the large flow rate and continuous process, inter...

AI Technical Summary

Problems solved by technology

However, the particles between the mesh wires of the filter cannot be removed because the mechanical device cannot penetrate deeply.

[0007] 2. After all, the mechanical cleaning device and the surface of the filter screen cannot be completely ideally fitted. Where the fit is not tight, a certain degree of particle accumulation will be formed, which will affect the filtration efficiency.

[0008] 3. Only using liquid to recoil the filter screen under the action of pressure difference will consume a large amount of filtered liquid and increase energy consumption

Especially the filtered liquid is an expensive liquid, such as cutting fluid, which will greatly increase the cost

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