| 摘要 |
A centrifugal pump includes an impeller (28) rotatably disposed in a volute case (29) for forcing a fluid to flow along a volute internal flow channel (84) formed in the volute case, and first to fourth flow-channel recessed portions (56-59) opening to the volute internal flow channel. The first and fourth flow-channel recessed portions are formed so as to be recessed in a direction substantially orthogonal to a direction of flow of the fluid. In a self-priming operation, the fluid is introduced into the first and fourth recessed portions whereupon the prime fluid is stirred within internal spaces of the first and second flow-channel recessed portions. |
