Patent ID: 8491786

Claim:
A circulation type water purifier comprising: a clean water filter ( 100 ); a storage tank ( 200 ) in which water purified through the clean water filter ( 100 ) is stored; a cold/hot water supply tank ( 300 ) cooling and heating the water supplied from the storage tank ( 200 ) to drain the cooled and heated water to respective drain outlets; a drain pipe ( 351 ) connected to the cold/hot water supply tank ( 300 ) to drain the water in the cold/hot water supply tank ( 300 ) when cleansing the interior of the cold/hot water supply tank ( 300 ); a pump ( 400 ) periodically circulating water at every circulation time under a control of a microcomputer; a circulation pipe connecting the clean water filter ( 100 ), the storage tank ( 200 ), the cold/hot water supply tank ( 300 ), the drain pipe ( 351 ) and the pump ( 400 ), the circulation pipe comprising a first circulation pipe ( 500 ) connecting the clean water filter ( 100 ) and the storage tank ( 200 ), a first auxiliary circulation pipe ( 230 ) connecting the storage tank ( 299 ) and the cold/hot water supply tank ( 300 ), a second circulation pipe ( 600 ) connecting the storage tank ( 200 ) and the clean water filter ( 100 ), and a second auxiliary circulation pipe ( 700 ) connecting the cold/hot water supply tank ( 300 ) and the second circulation pipe ( 600 ), the second auxiliary circulation pipe 700 comprising a third auxiliary connection pipe 711 connecting a cold water outlet 311 and the second circulation pipe 600 , a fourth auxiliary connection pipe 721 connecting a hot water outlet 321 and the second circulation pipe 600 , and a fifth auxiliary connection pipe 731 connecting the drain pipe 351 and the second circulation pipe 600 ; and a sterilizer ( 900 ) installed to the circulation pipe to sterilize water flowed into the circulation pipe.