To reduce the noise of a drainage pump installed in an air conditioner.
This drainage pump comprises a motor 10, an impeller 100a connected to the output shaft of the motor, and a pump housing 50a in which the impeller is stored. The impeller 100a comprises a shaft 100 connected to the output shaft of the motor, plate-like large diameter blades 120 radially extending from the shaft, plate-like small diameter blades 140 connected to the large diameter blades through connection parts, a ring member 150 for connecting outer peripheral parts of the large diameter blades to one another, and a hollow disk member 160a connected to the lower end of the ring member. The disk member 160a of the impeller has an angle of approximately 15° relative to the horizontal plane. The bottom face of the pump housing 50a in which the impeller is stored corresponding to the disk member has an angle of approximately 5° relative to the horizontal plane.
| JPS6138190 | IMPELLER FOR ROTARY CONICAL PUMP |
| JPH05187379 | DRAIN PUMP AND ITS MOUNTING STRUCTURE |
| JP6091308 | Drain pump |
IMAI MASAYUKI
KATO TOMOYA
| JP2001123977A | 2001-05-08 |
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