Novel sand and rock filter

Abstract

The invention provides a novel sand and rock filter, relates to a filter for surface water filtering and sewage treatment, and aims to provide a novel sand and rock filter which is simple in structure, low in use and maintenance cost, and complete in filtering and cleaning. The novel sand and rock filter comprises a tank body; a water inlet and a sand filling opening are formed in the upper part of the tank body; a water outlet and a sand digging opening are formed in the lower part of the tank body; a plurality of brackets are mounted below the tank body; a single buffering baffle is arranged under the water inlet; the edge part of the buffering baffle is arranged upwards in an inclined manner; a filter element base is mounted above the water outlet; a back washing valve and a plurality of filter elements are arranged on the filter element base; each filter element comprises a framework and a wrapping wire wound on the framework; the cross section of the wrapping wire is trapezoidal; the bottom surface, corresponding to the longer bottom edge, of the trapezoidal cross section is in contact with the framework; a V-shaped clearance is defined by two adjacent circles of the wrapping wire on the framework; a sand and rock mixing layer is arranged in the tank body; the top surface of the sand and rock mixing layer is higher than the upper surfaces of the filter elements.

Description

technical field [0001] The invention relates to a filtering device, in particular to a novel sandstone filter used for surface water filtering and sewage treatment. Background technique [0002] At present, there are various filter functions and types on the market, such as centrifugal filters, self-cleaning filters, mesh filters, disc filters, sand media filters, and so on. Among them, the ability of the sand filter to filter out and retain impurities is very strong. Existing gravel filter, such as a kind of gravel filter disclosed in Chinese invention patent CN202376852U, comprises a tank body, the top of the tank body is provided with a water inlet and a sand inlet, and the bottom of the tank body is provided with a water outlet and a sand replacement port. The inside of the tank is provided with a sand base, and the water outlet is connected with a filter screen through threads. The wires of the filter screen are wound on several stainless steel trapezoidal frameworks o...

AI Technical Summary

Problems solved by technology

The sand base layer of this filter is set in layers of fine sand, medium sand and coarse sand, and each layer has a different filtering effect. The layer structure between each other needs to be kept relatively complete to exert a better filtering effect. After the sand base is scoured by water for a long time, the jelly in the water will easily form compaction in the sand layer, which will affect the filtering effect. Since this kind of filter cannot destroy the layered sand and gravel structure, it often needs to be

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