| 摘要 |
PROBLEM TO BE SOLVED: To provide a sight glass capable of keeping internal monitor preferably with a simple constitution. SOLUTION: The sight glass of this invention is provided with the branching structure part 3 for branching from the flowing structure 2 of the powder body 5, the sight part 6 is provided across the communicating path 3b opposite to the communicating port 3a. The communicating path 3b of the branching structure 3 is provided with the structure surface 7 to which the powder body 5 flows in from the flow path 2b, so as to make it flow out to the flow path 2b. The structure surface 7 and the perpendicular surface 10 perpendicular to the central axis 9 of the flow path 2b make an angleθlarger than the angle of repose of the powder body 5. COPYRIGHT: (C)2007,JPO&INPIT
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