Backwash filter

Abstract

The invention relates to a backwash filter, which comprises a case with medium inlet, outlet and a dirt outlet; an upper cover; a ball valve connected with the dirt outlet; a filter screen with filter hole inside the case; and a baffle ring at the upper part of case which is the improvement of said invention. Wherein, the upper cover has a lower end inserted into the inner chamber of case; the filter screen is radially mounted inside the case and moves upwards and downwards along the case; a spring is mounted between the filter screen and the inner bottom of case; the blade wheel via medium can transfer the hydraulic energy into the flowing energy to drive the rotation movement; a shoulder part is arranged on the filter screen to adjust the medium flow and via switching the contact between it and the lower end or the baffle ring, it can realize the switch between the filtration and the washing. The invention has simple structure which can effectively washing out the foreign material embedded in the filter hole, without power supply, and more filter screens can be used to improve the purity of filter medium.

Description

technical field [0001] The invention relates to a filter for liquid filtration, especially a filter with backwashing function. Background technique [0002] Protecting water resources and saving water are closely related to people's lives, and the reuse of water resources is particularly important. Industrial water, air conditioning cooling circulating water, car washing circulating water, boiler water, bath water, swimming pool water, chemical and pharmaceutical water, well water, river water, etc., all need to be filtered, which is the only way to reuse water resources. Because the traditional method of filtering with chemical substances is rarely used, most of them use physical purification method filters to remove impurities in water through the principle of mechanical filtration. Mechanical filters are the most commonly used equipment. In traditional mechanical filters, the medium is filtered from the inner cavity of the filter screen through the filter holes to the ou...

AI Technical Summary

Problems solved by technology

The "automatic backwash filter" of Chinese patent 02149389.8 uses the filter valve plate and the backwash valve plate to realize the filtering and backwash functions. The direction of the water flow remains unchanged during flushing, and the sundries embedded in the filter holes may not be easily taken away, so its backwashing effect needs to be proved by practice

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