LIGHT INDUCTION FLOWMETER

摘要

A light induction flowmeter for a water purification system such as reverse osmosis in water vending machines includes a flowing device (10) and a light induction unit (2). The flowing device has a propeller wheel (13) which is driven to rotate by a flow of water and has a magnetic element (131). The light induction unit has an infrared beam emitting member (22), an infrared beam detector (23) and a magnetic induction rotator (210). The magnetic induction rotator is driven by the rotating magnetic element of the propeller wheel and thus its rotation is in synchronization with the rotating movement of the propeller wheel of the flowing device. When the rotator rotates, it intermittantly blocks off the path of the infrared beam emitted continuously by the infrared beam emitting member and the infrared detector receives the intermittent infrared light. The frequency of the reception of such intermittent infrared light by the infrared beam detector is proportional to the flow rate. The infrared beam detector converts the intermittent infrared light into electrical signals and transmits them to an external electronic counter which can therefore record the accumulative quantity of flowing water.