Spiral-wound membrane element

Abstract

The invention discloses a spiral-wound membrane element which comprises a central water collection pipe, a binder, a separation diaphragm, a raw water diversion net and a produced water diversion net.The separation diaphragm, the raw water diversion net and the produced water diversion net form a water purifying diaphragm group which is wound on the central water collection pipe, the separation diaphragm is a sheet high-precision filtering membrane, and one side of the separation diaphragm is adjacent to the raw water diversion net while the other side of the same is adjacent to the producedwater diversion net; after the water purifying diaphragm group is wound on the central water collection pipe, the whole outer side surface is wound and sealed by using an adhesive tape, and a raw water incoming end and a concentrated water discharging end are arranged. By setting thickness of the raw water diversion net and the produced water diversion net in the spiral-wound membrane element to be in gradient distribution from the raw water incoming end to the concentrated water discharging end, linear speed of water discharged by the concentrated water discharging end is increased, the membrane element is less prone to being blocked, desalinization rate and pollution-resistant rate of a membrane are increased, service life of the membrane is prolonged, and using cost is lowered.

Description

technical field [0001] The invention relates to a water purifying device, in particular to a filter of the water purifying device, in particular to a roll-type membrane element of a filter. Background technique [0002] Roll-type membrane elements are one of the most widely used membrane application forms in the market at present. They have the advantages of high packing density, easy installation and operation, compact structure, large effective membrane area per unit volume, and relatively simple manufacturing process. At present, the commonly used roll-type membrane elements are common separation membranes used in the field of fluid separation, including reverse osmosis membranes, nanofiltration membranes, ultrafiltration membranes, microfiltration membranes, etc., they use the separation characteristics of the separation membrane itself, Remove one or more substances in the fluid to achieve the purpose of purification, concentration and purification. [0003] The existi...

AI Technical Summary

Problems solved by technology

Since the separation membrane of the traditional roll-type membrane element is in the shape of a flat plate, the water inlet channel and the water production channel are respectively provided by the raw water diversion net and the produced water diversion net. When the raw water passes through the entire membrane element, it is close to the raw water The pressure of the diaphragm at the inlet end is high, and the water flow line speed is fast, while the pressure of the diaphragm near the concentrated water discharge end decreases, and the water flow line speed decreases. The desalination rate, water flux and pollution resistance are reduced, and the membrane elements are easy to clog, which shortens the service life of the membrane and increases the cost of use

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