Filtration system for drinking water

Abstract

The invention relates to the technical field of environment protection, and relates to a filtration system, particularly a filtration system for drinking water. The filtration system for the drinking water comprises an input end. The input end is provided with a liquid separation device and a wastewater utilization group in parallel. The liquid separation device comprises a three-position four-way directional control valve. The three-position four-way directional control valve is connected to filtration units. The filtration units are provided with two parallel filtration layers through pipes. Output ends of the filtration layers are connected to an outlet valve. The filtration system for the drinking water is advantageous in that during a daily normal water-consuming process, high-frequency automatic backwash on the two groups of the filtration units can be implemented by automatically switching the three-position four-way directional control valve while high-precision filtration on running water is realized, thereby greatly increasing the service life of a filtration medium. Besides, wastewater of the backwash is not discharged without use, and can enter water-consuming points that have low requirements for water quality, such as a water tank of sanitary ware, so as to achieve a water-saving effect that the wastewater is utilized economically and effectively.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and relates to a filtering system, in particular to a drinking water filtering system. Background technique [0002] There are two basic methods of liquid filtration, physical and chemical. The physical method is also called the mechanical method, and it is widely used because of its simplicity and ease of use and relatively low cost of use. The present invention relates only to physical means of filtration. The principle of physical filtration of liquids is very simple, as long as the liquid to be filtered passes through a filter medium (such as filter paper, filter screen, etc.) under a certain pressure, the liquid can be filtered. But this very simple filtration involves two pairs of very prominent contradictions, that is, the contradiction between the precision of the filter medium and the filtration rate (flux); the contradiction between the diameter precision of the filte...

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Problems solved by technology

Increasing the dynamic pressure is limited by the pressure resistance index of the filter medium, and increasing the number of through holes of the filter medium is firstly restricted by the technical conditions of filter medium manufacturing, and secondly, the manufacturing cost will increase significantly; simply increasing the number of filter media will be selected The filter device is bulky and increases the cost. In short, no matter which method is used, it cannot solve the most fundamental problem, that is, the clogging of the filter medium will reduce the service life of the filter medium, especially in the ultra-precision filter system. The problem of service life, although some liquid separation devices have the above-mentioned advantages at present, there are still some disadvantages; the self-purification of the entire separation device cannot be realized, and the interior is generally cleaned after disassembly. Obviously, this method consumes man-hours , In addition, the waste of water resources after washing is relatively large, which is not conducive to environmental protection and rational use of water resources

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