Water purifier with automatic backwash function, and automatic backwash cleaning method thereof

Abstract

The invention discloses a water purifier with an automatic backwashing function. The water purifier comprises a primary filtering device, a water storage tank, a booster pump, an ultrasonic transducerand a control device, the water inlet end of the primary filtering device is connected with a water inlet pipe, the water inlet pipe is connected with a first electromagnetic valve, the water outletend of the primary filtering device is connected with a primary water outlet pipe of which the other end is connected with the water inlet end of the water storage tank, the primary water outlet pipeis connected with a second electromagnetic valve, the water return end of the water storage tank is connected with a return pipe with the other end connected with the water inlet end of the booster pump, the return pipe is connected with a third electromagnetic valve, the water outlet end of the booster pump is connected with a first branch pipe, the other end of the first branch pipe is connectedwith the water outlet end of the primary filtering device, the drainage end of the primary filtering device is connected with a primary waste liquid pipe, the primary waste liquid pipe is connected with a fourth electromagnetic valve, and an ultrasonic transducer is arranged on the outer side wall of the primary filtering device. The ultrasonic transducer is used for carrying out ultrasonic cleaning on a primary filter element and is matched with purified water to carry out backwash cleaning on the primary filter element, so that the filter element is cleaned cleanly and thoroughly.

Description

technical field [0001] The invention relates to the related technical field of automatic cleaning of water purifiers, in particular to a water purifier with automatic backwashing and an automatic backwashing cleaning method thereof. Background technique [0002] With the continuous aggravation of water pollution, it is becoming more and more difficult to drink healthy water, so household water purifiers are favored as a health product for water drinkers. [0003] Most of the water purifiers adopt the progressive structure of the principle of resistance sieve filtration, which is composed of multi-stage filter elements connected in series from end to end. The precision of the filter elements is arranged in order from low to high, so as to realize the multi-stage filter elements to share and retain dirt, thereby reducing filter blockage. The frequency of manual sewage discharge, dismantling and washing, and the extension of the replacement cycle of the filter element; however,...

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Problems solved by technology

[0003] Most of the water purifiers adopt the progressive structure of the principle of resistance sieve filtration, which is composed of multi-stage filter elements connected in series from end to end. The precision of the filter elements is arranged in order from low to high, so as to realize the multi-stage filter elements to share and retain dirt, thereby reducing filter blockage. The frequency of manual sewage discharge, dismantling and washing, and the extension of the replacement cycle of the filter element; however, after the filter element of the water purifier has been used for a period of time, a layer of dirt will adhere to it, making the filter element clogged and the water purification effect deteriorated. It needs to be replaced regularly. Greatly increase the cost of using the water purifier in the later stage; or use manual cleaning of the filter element, but it will increase the cleaning cost, and it will pollute the filter element and affect the quality of filtered water

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