| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal pump with an improved casing shape, which has been an impediment to pump suction performance. SOLUTION: The centrifugal pump has a protrusion 62 protruding in the rotational axis direction of an impeller 53 at a portion continuous to a periphery of an opening edge of a suction port part 60 of an impeller chamber 58 in an inner wall face of a suction flow passage 54 of the casing 51. The protrusion 62 has a shape satisfying a condition in which B/A is 0.23 to 0.31, wherein a distance in a rotational axis center direction from a blade start end position to a top of the protrusion in the impeller chamber in the rotational axis center direction of the impeller 53 is B, and a distance from the blade start end position in the impeller chamber to an ultimate position in an inner wall face of the suction flow passage 54 of the casing 51 opposed to the intake port part is A. COPYRIGHT: (C)2010,JPO&INPIT |
