| 摘要 |
In a pump, a main shaft (16) is rotatably supported by ball bearings (14, 15) in a casing (13) having a suction opening (11) and a discharge opening (12), an impeller (1) is connected to an end of the main shaft (16), and a canned motor (18) rotatably drives the impeller (17) through the main shaft (16). A front shroud (44) is provided at the front side in the axial center direction of the impeller (17), and a rear shroud (45) is provided at the rear side in the axial center direction. A predetermined gap (47) facing the axial direction is formed between the casing (13) and the front shroud (44), and sealing units (48, 49) facing the radial direction are provided between the casing (13) and the front shroud (44). This allows for extended life of the pump.
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