A boss fitted to a rotation shaft of a motor is placed on a bearing surface. An airflow producing unit includes blades protruding from the boss in a radial direction of the shaft and rotating with the boss. The boss includes a first end surface to contact the bearing surface when fitted to the shaft with a first end of the boss in a thickness direction facing the bearing surface, and a second end surface to contact the bearing surface when fitted to the shaft with a second end of the boss in the thickness direction facing the bearing surface. A degree of symmetry defined by A/B falls within a range of 1.0 to 1.3, where A is a height of the airflow producing unit from the first end surface, B is a height of the airflow producing unit from the second end surface, and A B.
PROPELLER-SHAPED IMPELLER AND RAILWAY CARRIAGE AIR-CONDITIONING APPARATUS
2020-08-27
Patent
Electronic Resource
English
PROPELLER-SHAPED IMPELLER AND RAILWAY CARRIAGE AIR-CONDITIONING APPARATUS
European Patent Office | 2020
|PROPELLER-SHAPED IMPELLER AND RAILWAY CARRIAGE AIR-CONDITIONING APPARATUS
European Patent Office | 2018
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