Reverse osmosis membrane element and water purification system

Abstract

The invention relates to a reverse osmosis membrane element and a water purification system. The reverse osmosis membrane element comprises reverse osmosis membrane sheet groups and a concentrated water pipe, wherein the reverse osmosis membrane sheet groups are rolled on the concentrated water pipe, the concentrated water pipe is provided with first water-passing holes, raw water flow channels ofthe reverse osmosis membrane sheet groups communicate with the first water-passing holes on the concentrated water pipe, raw water inlets of the reverse osmosis membrane sheet groups are located on an end face of the reverse osmosis membrane element, and are located on positions, near an outside face, of the reverse osmosis membrane sheet groups, a width of the raw water flow channels is relatively narrow and a cross-sectional area is relatively small, so that a flow velocity is increased, and the concentration polarization phenomenon is effectively alleviated. Pure water outlets of the reverse osmosis membrane sheet groups are located on the outside face of the reverse osmosis membrane element. Near the concentrated water pipe, a flow velocity of concentrated water in the raw water flowchannels is relatively high, that is to say, a shearing flow velocity of concentrated water ends in the raw water flow channels is relatively high, and thereby the concentration polarization phenomenon at the concentrated water ends is effectively reduced, a pollution rate of the reverse osmosis membrane element is reduced, and thereby reliability of the reverse osmosis membrane element is guaranteed and the service life is prolonged while water production efficiency is improved.

Description

technical field [0001] The invention relates to the field of water purification, in particular to a reverse osmosis membrane element and a water purification system. Background technique [0002] The reverse osmosis membrane element is mainly made of water inlet screen, reverse osmosis membrane and pure water diversion cloth rolled on the central water production pipe. Raw water enters the raw water flow channel from the raw water inlet of the reverse osmosis membrane element, permeates during the flow in the raw water flow channel, and forms pure water in the pure water flow channel on the reverse side of the reverse osmosis membrane. Finally, the pure water flows out from the pure water outlet for users, and the concentrated water flows out from the concentrated water outlet. However, the concentration polarization phenomenon of general reverse osmosis membrane elements on the concentrated water side is obvious, the service life of reverse osmosis membrane elements is low...

AI Technical Summary

Problems solved by technology

However, the concentration polarization phenomenon of general reverse osmosis membrane elements on the concentrated water side is obvious, the service life of reverse osmosis membrane elements is low, and the water production efficiency is low

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