Roll-type reverse-osmosis membrane element with variable-thickness channel net

Abstract

The invention discloses a roll-type reverse-osmosis membrane element with a variable-thickness channel net, formed by overlapping and winding a pure-water diversion net, a reverse-osmosis membrane and an inlet diversion net on a center water-producing pipe. The inlet diversion net and the pure-water diversion net are respectively postioned in an inlet channel formed by the inner surface of the folded reverse-osmosis membrane and a water-producing channel formed by adjacent outer surfaces. The roll-type reverse-osmosis membrane element with the variable-thickness channel net is characterized in that the thickness of the inlet diversion net is gradually reduced along the flowing direction of raw water in the inlet channel. After improvement, when the inlet flow rate and the inlet flow value have constant lengths, the thickness of the inlet channel net is reduced, and the inlet flow rate can increase so that the flow rate of water on the membrane surface is increased, therefore, the invention lessens the concentration difference polarization phenomena of the membrane surface at the water concentrating end of the membrane element, stabilizes the desalting rate and the water-generating amount, decreases the pollution rate of the membrane element and prolongs the service life of the reverse-osmosis membrane.

Description

technical field

[0001] The invention belongs to the technical field of water purification treatment, and relates to a reverse osmosis membrane element for removing impurities such as sediment, silt, colloid, microorganisms, viruses, organic matter and inorganic salts in water, and in particular to a roll-type reverse osmosis membrane with variable channel network thickness element. Background technique

[0002] The roll-type reverse osmosis membrane element is composed of several standard size reverse osmosis membranes with exactly the same size, size and shape, a pure water diversion net, and an inlet water diversion net wound around the central water production pipe. The existing roll-type reverse osmosis membrane element adopts the water inlet guide net with the same thickness and weaving density. As part of the feed water permeates to the back of the reverse osmosis membrane to form pure water, the flow of feed water will become smaller and smaller. Usually, the final f...

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