| 摘要 |
PURPOSE:To lower noise caused by fluid colliding with terminal parts of pump channels. CONSTITUTION:Timing for collision of high pressure fluid with the terminal parts 32a, 33a of grooves 32, 33 is staggered so as to lower collision noise because the terminal parts 32a, 33a of the grooves 32, 33 provided to form pump channels to the side wall part 17 and casing cover 19 of a casing main body 18, are moved by 1/2 pitch of a blade 27 against the rotational direction of an impeller 20.
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