Rolled reverse osmosis element and preparation method thereof

Abstract

The invention provides a winding type reverse-osmosis element. The winding type reverse-osmosis element comprises a central pipe and more than two diaphragm groups wound on the central pipe, wherein one end of the central pipe is closed and the central pipe is provided with a plurality of water feeding holes; a pure-water outlet of the winding type reverse-osmosis element is positioned on the circumferential surface of the winding type reverse-osmosis element, and a concentrated-water outlet of the winding type reverse-osmosis element is positioned on the end surface, close to the closed end of the central pipe, of the winding type reverse-osmosis element. The invention also provides a preparation method of the winding type reverse-osmosis element. The winding type reverse-osmosis element and the preparation method provided by the invention have the advantages that since the concentrated-water outlet of the winding type reverse-osmosis element is positioned on the end surface, close to the closed end, of the winding type reverse-osmosis element, the concentrated-water outlet is only a part of the end surface of the reverse-osmosis element and the flowing-out direction of concentrated water is not consistent to the water feeding direction, so that the flowing speed in water feeding can not have influence on the flowing speed of water flow on the surfaces of diaphragms, further the pollution speed of the reverse-osmosis diaphragms is effectively reduced and the service life of the winding type reverse-osmosis element is prolonged.

Description

technical field [0001] The invention relates to the field of water purification systems, in particular to a roll type reverse osmosis element. Background technique [0002] The current roll-type reverse osmosis membrane elements are formed by winding the water purification membrane group composed of superimposed water inlet diversion net, reverse osmosis diaphragm and pure water diversion net on the central water production pipe and sealingly connected. Such as figure 1 , its main working process is that the raw water enters from one end of the element, flows along the water inlet diversion net, and a part of the raw water passes through the reverse osmosis membrane under pressure to form produced water, flows along the pure water diversion net and gathers to the central pipe for collection Pure water; another part of raw water flows out from the other end of the membrane element along the water inlet guide net. Membrane elements with this structure are prone to membrane f...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problem of surface contamination of the membrane element far away from the center pipe end, the purpose of the present invention is to provide a new roll-type reverse osmosis element and its preparation method

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