Reverse osmosis device

Abstract

The invention provides a reverse osmosis device which rinses the reverse osmosis film and keeps its good performance without reducing permeated water quantity, comprising: film separating mechanism (10) used to separate object materials from raw water by reverse osmosis film; supply mechanism (20) which pressurizes raw water and supplies to film separating mechanism (10); water supply pipe (30) which supply raw water passing through reverse osmosis film to outside; drainpipe (35) discharging raw water which doesn't pass throught the reverse osmosis film to outside; water supply valve (31) arranged on the water supply pipe (30); drain valve (36) arranged on the drainpipe (35); pressure sensor (41) which closes electrical connection point when the checked water pressure in water supply pipe (30) indicates that the water pressure in water supply pipe (30) during water supply valve (31)'s closing is higher than the value during water supply valve (31)'s opening; and the control device which keeps drain valve (36) open for a certain time when the pressure sensor (41) closes electrical connection point.

Description

technical field [0001] The present invention relates to a reverse osmosis device configured to separate and remove substances to be separated contained in raw water using a reverse osmosis membrane. Background technique [0002] As the above-mentioned reverse osmosis device, for example, a device disclosed in JP-A-2002-119965 is known in the art. The reverse osmosis device comprises: a reverse osmosis membrane; a membrane separation mechanism that is composed of a pressure-resistant structure container housing the reverse osmosis membrane inside and uses the reverse osmosis membrane to separate the separation target substances contained in the raw water; The supply pipe on the top and the supply mechanism composed of the supply pump that pressurizes the inside of the container body through the supply pipe to supply raw water; the water supply pipe connected to the container body to supply the raw water that has passed through the reverse osmosis membrane to the outside; conn...

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned conventional reverse osmosis apparatus configured to perform membrane separation treatment and cleaning treatment at the same time, during the cleaning treatment, the amount of permeated water sprayed from the water supply pipe due to permeation of the reverse osmosis membrane decreases. , so has the problem of inefficiency

[0008] In addition, if the interval between cleaning treatments is set to be extended in order to prevent such a problem, there is a problem that the accumulation of the separation target substance on the surface of the reverse osmosis membrane proceeds, the performance of the reverse osmosis membrane is greatly reduced, or it is difficult to It takes a long time to remove the accumulated separation object substance or remove the separation object substance

[0009] In addition, in the case of discontinuous use of the reverse osmosis device, compared with the case of continuous use, the time required for the treatment time of the reverse osmosis membrane to reach a certain time becomes longer, so the following problems arise as described above. The performance is greatly reduced, or it is difficult to remove the accumulated separation target substance, or it takes a long time to remove the separation target substance

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