Water purifier and method for decreasing TDS value of pure water

Abstract

The invention discloses a water purifier and method for decreasing the TDS value of pure water. The water purifier comprises a raw water inlet, a first reverse osmosis (RO) filter element and a composite filter element; a front filter element is arranged outside the composite filter element, and a second RO filter element is arranged inside the composite filter element; the raw water inlet is connected with a water inlet of a pressurizing pump, and the pressurizing pump is connected with the water inlet end of the first RO filter element through a first water inlet solenoid valve, and meanwhile connected with the water inlet end of the second RO filter element through a second water inlet solenoid valve; and the pure water end of the second RO filter element is connected to the water inletend of the first RO filter element through a second check valve, and a concentrated water outlet of the second RO filter element communicates with an outlet of the front filter element. The compositefilter element is constituted by the front filter element and the second RO filter element, the problems of an excessively large purifier body, cost suddenly-increasing and the like caused by additionally arranging the RO filter elements are avoided, the pure water produced by the second RO filter element is utilized to replace concentrated water in the first RO filter element, the problem of iondiffusion is solved, and thus the TDS of the pure water in the pure water end is not increased.

Description

technical field [0001] The invention belongs to the technical field of water purification equipment, in particular to a water purification machine and a method for reducing the TDS value of pure water. Background technique [0002] The traditional reverse osmosis water purifier, the water production capacity is usually 50 gallons per day, the water production capacity ranges from 400 gallons to 800 gallons, or even more than 1,000 gallons, which are generally called large-flux water purifiers. Large-flux water purifiers are improving At the same time as certain performance, it also brings new problems in terms of hygiene indicators and cost performance, resulting in the problem of "living in water". [0003] At present, the flow channel of the reverse osmosis membrane filter element (RO filter element) is as follows: the raw water enters from one end of the filter element, the raw water is filtered from the outside to the inside, the filtered pure water goes out through the ...

AI Technical Summary

Problems solved by technology

If it diffuses overnight, the TDS value of the pure water in the pure water side will increase significantly. If there are more heavy metal ions in the raw water, the heavy metals in the pure water will also exceed the standard, and the water quality and taste will be greatly affected.

[0004] When the high-throughput water purifier is working, the TDS at the pure water end is in a normal state. When the user stops using it, the concentrated water at the water inlet end of the RO membrane will gradually diffuse to the pure water end, and the diffusion time will start to appear after more than 5 minutes. The water at the pure water end generally depends on the size of the membrane shell, usually about 500-1000ml, which leads to a high TDS value of the first glass of water after restarting work

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