CHEMICAL FEEDER FOR FINELY ADJUSTING FEEDING RATE OF CHEMICALS IN PROPORTION WITH FLOW RATE OF RAW WATER

摘要

PURPOSE: Provided is a chemical feeder being capable of finely adjusting dosage of chemicals to be fed and adjusting feeding rate of chemicals to be in proportion with flow rate of raw water. CONSTITUTION: The chemical feeder for feeding chemicals to raw water being transferred from an intake of water to a water tank of waterworks through a water transportation pipe, comprises a chemical tank (10) connected to an air injection unit (11) for storing chemicals therein, and a chemical feeding pipe (20) with an end located on the inside of the water transfer pipe and the other end located on the inside of the chemical tank (10) and dipped in chemicals, wherein the water transportation pipe (3) has a venturi tube where the chemical feeding pipe (20) is externally inserted thereinto.