A large-flow and long-life roll-type reverse osmosis membrane element

Abstract

The invention discloses a high-flow long-life roll type reverse osmosis membrane element. The high-flow long-life roll type reverse osmosis membrane element comprises a central pipe, membrane bags and a water inlet grid. A water cavity is formed in the central pipe, and water passing holes are formed in the side wall of the central pipe and communicated with the water cavity. The membrane bags are wound on the central pipe, the water inlet grid is arranged between the membrane bags, and the interiors of the membrane bags are communicated with the water cavity through the water passing holes of the central pipe. The upper ends of the membrane bags and the upper end of the water inlet grid serve as raw water inlet ends, raw water is filtered through the membrane bags and then enters the water cavity of the central pipe, and the lower ends of the membrane bags and the lower end of the water inlet grid serve as concentrated water discharging ends. The thickness of the raw water inlet end and the concentrated water discharging end of the water inlet grid is larger than that of the middle of the water inlet grid, and thus a wide raw water inlet channel, a narrow middle water inlet channel and a wide concentrated water discharging channel are formed as the two ends of the water inlet grid are thick and the middle of the water inlet grid is thin. By means of the high-flow long-life roll type reverse osmosis membrane element, the pure water yield per unit time can be increased, the concentration polarization effect can be relieved, dirt is not likely to attach to the surfaces of reverse osmosis membranes, and thus the service life of the reverse osmosis membranes is prolonged.

Description

technical field [0001] The invention relates to the technical field of water filtration, in particular to a roll-type reverse osmosis membrane element with large flow and long life. Background technique [0002] In the prior art, in the field of water filtration technology, the roll-type reverse osmosis membrane element usually includes a central tube, a membrane bag and a water inlet grid; a water cavity is formed in the central tube, and a plurality of water holes are arranged on the side wall of the central tube , the water hole communicates with the water cavity; the film bag is wound on the central tube, and the water inlet grid is set between the film bag and the film bag, that is, the adjacent film bags are separated by the water inlet grid to form an inlet Water channel; the membrane bag is composed of the upper reverse osmosis membrane, the lower reverse osmosis membrane and the diversion cloth placed between the upper reverse osmosis membrane and the lower reverse ...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the roll-type reverse osmosis membrane element are: the pure water production per unit time needs to be further improved; at the same time, the concentration polarization effect is prone to occur, making it easy for dirt to adhere to the surface of the reverse osmosis membrane

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