| 摘要 |
PURPOSE:To cool a motor by means of air by providing an introduction port, which is exclusively used for exhaust, in addition to an air introduction port to a revolving blade part, and providing an air introduction port to a motor room, and further providing an air hole to the middle part of a partition wall. CONSTITUTION:An air introduction port 21 is provided to an end of a motor casing 9 on its motor room 14 side, while an air hole 26, which makes the air from the air introduction port 21 pass into a revolving blade part 1, is provided at the middle part of a partition wall 15. An exhaust introduction port 18 is formed at the middle part of a side-and-end part of a revolving blade chamber 10, while an air outlet 27 is formed at the outer circumferential part of the chamber 10. The air is introduced from the air introduction port 21 into the motor room 14 and is sucked from an introduction port 22 via the air hole 26 into the revolving blade part 1. The exhaust gas is mixed with the air, which is sucked from a revolving-blade-air-introduction-port 12 via both introduction ports 18 and 19, and is discharged from outlets 13 and 27. As a result, the motor can be cooled only by air, thereby prolonging the life of the motor.
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