Roll-type membrane element

Abstract

The invention discloses a roll-type membrane element comprising a central tube, a water purification diaphragm group and a guide bar, wherein the water purification diaphragm group is wound on the central tube, and comprises a raw water guide net, a flake high-precision filter membrane and a product water guide net; one side surface of the flake high-precision filter membrane is adjacent to a raw water runner or adjacent to the raw water guide net; the other side surface of the flake high-precision filter membrane is adjacent to a water-yielding runner or adjacent to the product water guide net; a space for arranging the raw water guide net is the raw water runner; a space for arranging the product water guide net is the water-yielding runner; at least one guide bar is arranged inside the raw water runner; the length of the guide bar is close to that of the raw water guide net in a winding direction after being unfolded; the internal part of the central tube is communicated with the raw water runner; the entire outer side surface is wound and sealed by an adhesive tape after the water purification diaphragm group is wound on the central tube. The roll-type membrane element disclosed by the invention is not easily blocked, long in service life and high in recovery rate.

Description

technical field [0001] The invention relates to a coiled membrane element for water treatment. Background technique [0002] The roll-type reverse osmosis membrane elements of the known technology are usually formed by winding one or two sets of water purification membranes on the central water production pipe. Membranes and a production water diversion network are superimposed; the inner side of the two sheet-shaped reverse osmosis membranes is the raw water flow channel and the raw water diversion network is set in it, and the outer side of the two sheet-shaped reverse osmosis membranes is the product water flow channel and in the production A water production diversion net is set in the water flow channel; the water production flow channel is provided with an opening on the side facing the central water production pipe, and the opening is connected to the inside of the central water production pipe, and the remaining three sides of the water production flow channel are bo...

AI Technical Summary

Problems solved by technology

[0007] 2. The length of the raw water channel is too short, resulting in low energy utilization

Comprehensive above-mentioned four points, can draw following conclusion: the raw water before flowing into raw water channel, will have larger water pressure, also will have bigger flow; Bottom) still maintain almost the same high water pressure as before, and the flow rate is not reduced much, not more than 25%, that is to say, about 75% of the energy in the raw water has not been effectively used, and this part contains higher energy The concentrated water is usually discharged after being depressurized by a throttling device (commonly known as the waste water ratio), and the energy in it is wasted

[0009] 3. Too much waste water discharge

[0010] To make the reverse osmosis membrane have a long enough service life, it is necessary to ensure that the raw water side of the reverse osmosis membrane has a sufficient water flow velocity. The raw water channel is too wide, so it discharges a lot of concentrated water, wasting water resources

[0011] 4. The flow rate of raw water in the membrane element becomes smaller and smaller, which makes reverse osmosis easy to block

The flow rate of raw water is getting smaller and smaller, which will cause the substances that are easy to clog the reverse osmosis membrane in the water to deposit more and more easily on the surface of the reverse osmosis membrane, and eventually make the reverse osmosis membrane clogged and scrapped

[0013] 5. The length of the water production channel is too long and the width is too narrow

[0018] 2. The pure water channel has not been improved, and the original problems still exist

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