| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise of a drain pump equipped in an air-conditioning device. SOLUTION: The drain pump includes a motor 10, a rotary impeller 100 connected to the output shaft of the motor, and a pump housing 50 storing the rotary impeller. The rotary impeller 100 includes a shaft portion 110 connected to the output shaft of the motor, plate-like large-diameter blades 130 extending radially from the shaft portion, plate-like small-diameter blades 122 connected to the large-diameter blades via connecting portions, a ring member 180 connecting outer peripheral portions of the large-diameter blades, and a hollow disk member 150 connected to a lower end portion of the ring member. An upper edge portion on the outside of the ring member 180 is formed in a tapered face 200 and an expanded space 54 is formed at an upper part of a pump chamber 52. COPYRIGHT: (C)2011,JPO&INPIT
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