Water purifier

Abstract

The invention provides a water purifier. The water purifier comprises a raw water tank and an concentrated water tank, the raw water tank is provided with an outlet, and the concentrated water tank isprovided with an inlet; the water purifier further comprises a water pump and filters communicating with the outlet; the raw water tank is further provided with a circulating water inlet, and the lower end of the raw water tank is provided with a liquid level switch; and a concentrated water valve and a three-way valve for controlling and switching a flow direction through the liquid level switchare sequentially arranged between the filters and the concentrated water outlet in the direction of a concentrated water flow, the three-way valve is a one-inlet two-outlet valve, an inlet of the three-way valve is connected with the concentrated water valve, and two outlets of the three-way valve are respectively connected with the circulating water inlet and the inlet in the concentrated watertank. The water purifier provided by the invention can discharge waste water to the raw water tank for circulating filtration after raw water is filtered, and discharge the waste water generated by the final filtration into the concentrated water tank after a liquid level of the raw water tank is lowered and the TDS value is increased, thereby having the advantage of improving filtration efficiency and filtration effects.

Description

Technical field [0001] The invention relates to the field of water purifiers, in particular to a water purifier. Background technique [0002] In the traditional desktop water purifier-free water tank, the concentrated water flows back into the original water tank, causing the concentration of the original water tank to increase continuously. Taking a 5L original water tank as an example, after testing, if the original water TDS is 500, the final original water tank is left. The TDS of 1L of water may reach more than 5000, and the RO membrane is easily blocked when the water with such a high concentration passes through the RO membrane. There are also improved raw water tanks, such as the existing water purifier, although the raw water and concentrated water are combined For separation, the volume ratio of the raw water to the concentrated water tank needs to be relatively large to meet the recovery rate. This leads to the need for a high pure waste water ratio when RO membrane w...

AI Technical Summary

Problems solved by technology

But this kind of improvement needs to be used. For the same 80% recovery rate, the ratio of pure water to concentrated water is 4:1. If a 75G RO membrane is used, the rated flow rate of pure water is close to 200ml / min, and the flow rate of waste water can only be 50ml. / min, to meet the recovery rate)

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