Patent ID: 6235191
Filing Date: 2001-05-22
Classification: C02F

Abstract:
A water purifying apparatus comprising:a purification unit including a filter for filtering raw water to produce filtered water;a sterilization unit connected to said purification unit and supplied with said filtered water for irradiating said filtered water with ultraviolet rays to produce treated water which has been filtered and sterilized;a recirculating arrangement connected to said sterilization unit for recirculating said treated water through said sterilization unit;a water supply sensor connected to said sterilization unit for detecting supply of said treated water out of said water purifying apparatus to produce a supply detection signal;recirculation control means connected to said water supply sensor and said recirculating arrangement for controlling operation of said recirculating arrangement in response to presence and absence of said supply detection signal; andsaid recirculation control means comprising:particular time determining means for determining a particular time period; andstarting means connected to said particular time determining means, said water supply sensor, and said recirculating arrangement for starting said operation of the recirculating arrangement after lapse of said particular time period following reception of said detection signal.