Drug spray device and drug spray method

摘要

PROBLEM TO BE SOLVED: To prevent a two-fluid nozzle from being plugged caused by the deposition of solid components in a chemical agent that is sprayed.;SOLUTION: The chemical agent spraying device 104 having the two-fluid nozzle 3 connected to a liquid piping 1 that sends the chemical liquid D and an air piping 2 that sends the air Ab includes a chemical agent supply means 5 that is connected to the liquid piping 1 and supplies the chemical agent D to the liquid piping 1, a water supply means 6 that is connected to the liquid piping 1 and supplies the water W to the liquid piping 1, a liquid shifting means 7 that selectively shifts the circulation of the chemical agent D to the liquid piping 1 from the chemical agent supply means 5 and that of the water W to the liquid piping 1 from the water supply means 6, a pressure gauge 5d that detects the supply pressure of the chemical agent D in the chemical agent supply means 5, and a control means 19 that shifts the liquid shift means 7 to a side of the water supply means 6 and stops the driving of the chemical agent supply means 5 if a pressure detected with the pressure gauge 5d is inputted and the inputted pressure exceeds a predetermined threshold value with the liquid shift means 7 changed to the side of the chemical agent supply means 5 and the chemical agent supply means 5 driven.;COPYRIGHT: (C)2011,JPO&INPIT