| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise of a drainage pump installed to air-conditioning equipment or the like. SOLUTION: The drainage pump 1 is provided with a suction port 42, a pump room 44, a pump housing 40 having a discharge opening 46, and a cover 32. An inside moving blade 50 is driven by a motor 10. The moving blade 50 is provided with a shaft 52 for attachment to an output axis of the motor, a flat plate shape large-diameter blade 60 radiating from the shaft 52 and a small-diameter blade 54 continuing to the large-diameter blade 60. The outer peripheral part of the large-diameter blade 60 is connected by a cylindrical wall member 64, and the lower end of the large-diameter blade 60 is connected by a circular member 62. The upper end of the cylindrical wall member 64 is provided with an arcuate chamfer 70, and the lower end of the small-diameter blade 54 is also provided with a chamfer 57. COPYRIGHT: (C)2004,JPO
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