DEVICE FOR DISPLAYING FILTER EXCHANGE TIME OF WATER PURIFIER

PURPOSE: Provided is a device for displaying a filter exchange time of a water purifier which makes users inform the exchange time by measuring the total amount of used water with a ball flow meter. CONSTITUTION: The device comprises a flow meter(24) connected to a filter part and a waterway pipe to measure the total amount of filter water used, a flow meter ball(24a) installed on the inner part of the flow meter and rotating with flowing according to the water flowing, a plurality of sensor part mounted on one side of the flow meter to detect when the flow meter ball is passing and each having two photo-sensors(26a,26b) where a photo-diode is respectively mounted thereon, a counter(27) calculating signal detected by the sensor part, a display part(28) displaying the calculated value by the counter, an alarm device(29) alarming when the calculated by the counter is at least reference value and an outlet valve(25) which controls the discharge of the filtered water to the outside.