Membrane winding structure capable of improving flux of reverse osmosis membrane element and preparation method thereof

Abstract

The invention discloses a membrane winding structure capable of improving the flux of a reverse osmosis membrane element and a preparation method thereof. The membrane winding structure comprises a center pipe, and one port of the center pipe serves as a water inlet end; a water outlet is formed in the circumferential wall of the center pipe; the membrane winding structure also comprises at leastone layer of wound layer; the wound layer comprises a water inlet separation net; a first reverse osmosis membrane and a second reverse osmosis membrane are arranged on the upper and lower end faces of the water inlet separation net; the front surfaces of the first reverse osmosis membrane and the second reverse osmosis membrane both face the water inlet separation net; the back surfaces of the first reverse osmosis membrane and the second reverse osmosis membrane are both connected with pure water guide cloth; and the water inlet separation net, the first reverse osmosis membrane, the pure water guide cloth and the second reverse osmosis membrane are wound at the periphery of the center pipe. The preparation method comprises stacking the above parts in order and winding the parts at the periphery of the center pipe. The membrane winding structure can effectively improve the flux of the reverse osmosis membrane element and prolong the service life.

Description

technical field [0001] The invention relates to a coiled membrane structure for improving the flux of a reverse osmosis membrane element and a preparation method thereof. Background technique [0002] Reverse osmosis water purifiers currently occupy an important position in the domestic household water purification market. However, most of the current reverse osmosis membrane elements adopt the traditional rolling process, that is, the reverse osmosis membrane group formed by superimposing the pure water guide cloth and the reverse osmosis membrane bag embedded with the concentrated water grid is wound and rolled on the central tube. The side end of the reverse osmosis membrane element rolled and formed by this method is the raw water inlet. After the raw water is purified by the membrane under pressure, the pure water flows from the inside of the membrane bag through the pure water guide cloth and collects to the central pipe with holes to flow out. The filtered concentrat...

AI Technical Summary

Problems solved by technology

The water inlet direction of this reverse osmosis membrane element is the same as the concentrated water discharge direction, but the internal flow channel of the membrane element is wide and the process is short, resulting in slow internal water flow, concentration polarization is prone to occur on the membrane surface, and pollutants in the water are easy to flow. Membrane surface is deposited and polluted, which reduces the desalination rate and water flux of the membrane element, and ultimately shortens the life of the membrane element

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