AIR PURIFIER, METHOD FOR DETERMINING TIME TO REPLACE FILTER THEREOF, AND DEVICE AND METHOD FOR DETERMINING FILER REPLACEMENT TIME PRESSURE DIFFERENTIAL THEREFOR

摘要

An air purifier according to an embodiment of the present invention may comprise: a memory for storing a flow rate/pressure differential correlation graph with regard to each filter utilization state; a pressure differential sensor for measuring a pressure differential, which is a difference in pressure between the front and rear ends of the filter; and a filer replacement time management unit for determining the time to replace the filter according to a result of matching a pressure differential of the filter, which is measured by the pressure differential sensor at a preset cycle, and the flow rate of air flowing into the filter during pressure differential measurement with the flow rate/pressure differential correlation graph for each utilization state.