A water purifier and its control method

Abstract

The invention discloses a water purifier and a control method thereof. The water purifier comprises a reverse osmosis filter element and further comprises a first flushing flow path, a second flushing flow path, a concentrated water discharge flow path and a backflow flow path, wherein one end of the first flushing flow path is communicated with the concentrated water outlet of the reverse osmosis filter element, the other end of the first flushing flow path is communicated with the water inlet of the reverse osmosis filter element, one end of the second flushing flow path is communicated with the concentrated water outlet of the reverse osmosis filter element, the other end of the second flushing flow path is communicated with the water inlet of the reverse osmosis filter element, one end of the concentrated water discharge flow path is communicated with the concentrated water outlet of the reverse osmosis filter element, the other end of the concentrated water discharge flow path is used for discharging concentrated water to the outside world, the concentrated water discharge flow path is provided with a third valve system for controlling the on-off of the concentrated water discharge flow path, one end of the backflow flow path is communicated with the concentrated water outlet of the reverse osmosis filter element, the other end of the backflow flow path is communicated with the water inlet of the reverse osmosis filter element, and the backflow flow path is provided with a fourth valve system for controlling the on-off of the backflow flow path. In this way, the water purifier can solve the problem of rapid performance attenuation of a reverse osmosis membrane on the basis of increasing the concentrated water recovery rate.

Description

technical field [0001] The invention relates to the technical field of water purifiers, and more specifically, to a water purifier and a control method thereof. Background technique [0002] Existing water purifiers have the disadvantages of low concentrated water recovery rate and high concentrated water discharge. In order to realize the water saving effect of water purifiers, generally high recovery rate water purifiers reduce concentrated water discharge or return part of the concentrated water to partly discharge. [0003] However, although these two water treatment processes have improved the recovery rate to a certain extent and achieved the purpose of saving water, the concentration polarization on the surface of the reverse osmosis membrane is serious, and the reverse osmosis membrane will form CaCO 3 Small nuclei, if CaCO cannot be disturbed in time 3 The formation of small crystal nuclei will easily scale on the surface of the reverse osmosis membrane, accelerate...

AI Technical Summary

Problems solved by technology

[0002] Existing water purifiers have the disadvantages of low concentrated water recovery rate and high concentrated water discharge. In order to realize the water saving effect of water purifiers, generally high recovery rate water purifiers use the method of reducing concentrated water discharge or returning part of the concentrated water to part of the discharge.

[0003] However, although these two water treatment processes have improved the recovery rate to a certain extent and achieved the purpose of saving water, the concentration polarization on the surface of the reverse osmosis membrane is serious, and the reverse osmosis membrane will form CaCO 3 Small nuclei, if CaCO cannot be disturbed in time 3 The formation of small crystal nuclei will easily scale on the surface of the reverse osmosis membrane, and the performance decay of the reverse osmosis membrane will be accelerated, and the life of the reverse osmosis membrane will be greatly affected

[0004] Therefore, how to solve the problem of rapid attenuation of reverse osmosis membrane performance on the basis of improving the recovery rate of concentrated water has become an important technical problem to be solved by those skilled in the art.

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