To reduce the operating noises of a drain pump during low pump head.
The drain pump 8 comprises a pump casing 81 and an impeller 82. The pump casing 81 has a drain inlet 81a provided at the lower end for sucking drain water and a drain outlet 81b provided at the side for discharging the drain water. The impeller 82 has a shaft portion 91 arranged in the pump casing 81 extending in the vertical direction, a main blade 92 arranged on the outer periphery side of the shaft portion 91, an auxiliary blade 94 arranged on the lower side of the main blade 92, and a disc catch pan portion 93 arranged between the main blade 92 and the auxiliary blade 94 and having an opening portion 93a at the center. The catch pan portion 93 also has an annular partition portion 93b extending upward from the outer peripheral edge. The outer peripheral edge of the main blade 92 is arranged lower than the upper end of the partition portion 93b.
HIRAI MASAKAZU
MAEDA KAZUE
IWANAGA HIRONORI
SAYANAGI TSUNEHISA
Hidetada Kato
Yamashita
Hiroharu Kitahara
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