| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an attachment for mixing which permits control of variation of the concentrations of to-be-mixed chemicals in raw water even when the supplying pressure of raw water from an upstream passage varies and mixing the chemicals with raw water while keeping the concentrations of the chemicals in raw water for a specified time. <P>SOLUTION: An attachment 10 for mixing is arranged between an upstream passage 13 and a downstream passage 14, mixes to-be-mixed chemicals housed in a chemical housing chamber 15 with raw water incoming from the passage 13 and allows the raw water mixed with the chemicals to flow into the passage 14. The attachment 10 has an inner cylindrical body 19 and an outer cylindrical body 20: the inside of the body 19 serves as a main passage 21 for raw water, and a hollow part between the bodies 19 and 20 is used as a chemical housing chamber 15. The inside diameter D1 of the main passage 21a for raw water (the first narrowing portion) is smaller than the inside diameter D2 of the main passage for raw water at the position 21b (the inlet opening) where the inlet 16c of an incoming passage 16 for raw water into the chamber 15 is opened. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
