| CPC C02F 1/441 (2013.01) [C02F 1/001 (2013.01); C02F 2201/005 (2013.01)] | 8 Claims |
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1. A water purifier, comprising:
a filter unit including a reverse osmosis membrane filter configured to filter incoming water;
an extraction unit configured to provide purified water filtered by the filter unit to a user; and
a residual water drainage unit configured to, after extraction through the extraction unit is finished, drain residual water remaining in the extraction unit through the reverse osmosis membrane filter using an osmotic phenomenon of the reverse osmosis membrane filter;
a purified water discharge flow path through which purified water filtered by the reverse osmosis membrane filter is discharged; and
a drainage flow path through which concentrated water not filtered by the reverse osmosis membrane filter is discharged are connected to a rear end of the reverse osmosis membrane filter;
wherein the residual water drainage unit includes a residual water drainage flow path connecting the extraction unit to the purified water discharge flow path, and
wherein the residual water in the extraction unit flows into the reverse osmosis membrane filter through the residual water drainage flow path and the purified water discharge flow path by an osmosis phenomenon of the reverse osmosis membrane filter, and is drained through the drainage flow path;
the extraction unit is connected to an extraction valve for extracting purified water;
the residual water drainage unit further includes a residual water drainage valve installed in the residual water drainage flow path and opened during an operation of draining the residual water, and
the extraction valve is configured to include a plurality of unit valves in a complex manner to perform a function of extracting purified water and a connection function between the extraction unit and the residual water drainage flow path.
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