| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein an exhaust gas component is adhered to the entire inner face of a suction duct. SOLUTION: This suction duct includes an exhaust gas suction cylinder 2 having an upper portion inserted from a lower opening of a hanging duct 1 and a ring-shaped oil reservoir 3 circumferentially provided in an intermediate part of the exhaust gas suction cylinder 2. An insertion portion of the exhaust gas suction cylinder 2 to inside of the hanging duct 1 is set to be a cylindrical portion 2a, and a projecting portion from a lower end of the hanging duct 1 is set to be a smoke collecting portion 4 having a diameter gradually expanded donwardly. Formation of a laminar flow by indoor air along the inner face of the exhaust gas suction cylinder 2 due to straightening effects of the smoke collecting portion 4 and stabilization of the laminar flow by the cylindrical portion 2a prevent adhesion of the exhaust gas component to the inner face of the exhaust gas suction cylinder 2 and reduce the amount of adhesion of the exhaust gas component to the inner face of the hanging duct 1. COPYRIGHT: (C)2011,JPO&INPIT |
