Reverse-osmosis water purifier purging method

Abstract

The invention discloses a reverse-osmosis water purifier purging method, which includes: when water making of a water purifier is finished, a water pump continues to work in delay mode, and a purging solenoid valve is started for purging membrane elements in delay working of the water pump until waste water concentrated in the previous water making is fully discharged outside a membrane element container; and then the purging solenoid valve is closed, and the water pump continues to work to purge sludge and crystals in a waste water proportioner out through high-speed water under effect of pressure. The reverse-osmosis water purifier purging method has the advantages of timely discharging the concentrated waste water out of the membrane elements before the water purifier stops working, preventing crystals from depositing on surfaces of membranes and in the waste water proportioner, avoiding pollution of the membrane elements and prolonging surface life of the membrane elements.

Description

technical field [0001] The invention belongs to the technical field of household water purifiers, and relates to household water purifiers, in particular to a washing method for reverse osmosis water purifiers. Background technique [0002] Common reverse osmosis water purifiers or other water treatment products have the function of flushing the membrane element. When the water purifier is started, the flushing solenoid valve is opened to flush the surface of the membrane element with a large flow of water. However, such flushing has disadvantages. Taking the reverse osmosis membrane as an example, because the reverse osmosis membrane has a concentration effect on the feed water, the concentration of various impurities in the wastewater flowing out of the reverse osmosis membrane element is higher than that of the feed water. In some cases, the concentration of impurities in the wastewater It may reach twice or even higher than the incoming water. [0003] When the reverse ...

AI Technical Summary

Problems solved by technology

[0002] Common reverse osmosis water purifiers or other water treatment products have the function of flushing the membrane element. When the water purifier is started, the flushing solenoid valve is opened to flush the surface of the membrane element with a large flow of water. However, such flushing has disadvantages. Taking the reverse osmosis membrane as an example, because the reverse osmosis membrane has a concentration effect on the feed water, the concentration of various impurities in the wastewater flowing out of the reverse osmosis membrane element is higher than that of the feed water. In some cases, the concentration of impurities in the wastewater May reach twice or even higher than the influent

[0003] When the reverse osmosis membrane element is working, the influent water is continuously concentrated and then discharged, but some insoluble substances are concentrated and the concentration exceeds their solubility, forming crystals, and then depositing on the surface of the membrane element. If these crystalline substances cannot be discharged in time, these The crystals will form crystal scaling on the surface of the membrane element and adhere to the membrane, while the membrane attached by the sediment scale will reduce the filtration performance, which will directly lead to the reduction of the effective membrane area of ​​the membrane element, the decrease of the water production rate and the shortening of the service life

Under normal circumstances, after the water purifier finishes producing water, the water pump stops working, and the concentrated wastewater cannot be discharged from the membrane element in time, and the formed crystals slowly deposit on the membrane surface, causing the membrane element to gradually foul and foul

In addition, the caliber of the wastewater discharge is relatively small, and the small crystals formed are easy to block the wastewater discharge outlet. In the absence of water flow, the crystals accelerate the deposition on the membrane surface, which accelerates the fouling of the membrane, making the entire water purifier unusable

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