| 摘要 |
PROBLEM TO BE SOLVED: To restrain reduction in water supply performance, regardless of an intermediate extraction quantity, in a water supply pump. SOLUTION: A rotary shaft 62 is rotatably supported in a casing 61 of a hollow shape. A plurality of impellers 65 are axially installed on this rotary shaft 62. A water supply passage 66 is formed in the axial direction of the rotary shaft 62 to these impellers 65. While connecting a suction pipe 68 communicating with one end part of the water supply passage 66 to the casing 61, a delivery pipe 69 is connected to communicate with the other end part of the water supply passage 66. An intermediate delivery chamber 75 is formed between the plurality of impellers 65 in the casing 61 by being partitioned from the water supply passage 66. This intermediate delivery chamber 75 is communicated with the water supply passage 66 via a communicating hole 76. An intermediate delivery pipe 71 is connected to the intermediate delivery chamber 75. COPYRIGHT: (C)2007,JPO&INPIT
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