TWI754505B

• Main Authors: YAMAGUCHI, TAKASHI, YAMATANI, TAKAHIRO, NAGANO, KOTA, TERAMOTO, TAKUYA, HAYASHI, HIROYASU, HORIE, RYO, NAGANO, TOMOHIRO, HARA, YUKI
• Format: Patent
• Language: Chinese
• Published: 01.02.2022
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

A scroll casing has a scroll portion that guides airflow generated by a fan in a spiral shape, a discharge portion provided with a discharge port that causes airflow to be discharged, and a tongue portion provided at a part connecting a winding start portion of the scroll portion and the discharge portion. An extended plate extending from a winding end portion in the discharge portion has, in a cross section obtained by cutting the extended plate in a thickness direction thereof, a change point, at which an enlargement ratio of an area of the cross section orthogonally crossing the airflow is enlarged so as to be larger on a downstream side than that on an upstream side due to a change of inclination. In the extended plate, an angle θ1 defined by a first portion, which is a part upstream from the change point, and a virtual line parallel to an inner wall of the housing and passing through the change point, and an angle θ2 defined by a second portion, which is a part downstream from the change point, and the v