| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller for a water pump capable of reducing vibration by suppressing generation of axial thrust, adjusting both of mechanical balance in air and water power balance in water, and reducing failure due to clogging and entangling of foreign matters and the like without degrading pump efficiency, and not causing cost up of a product due to increase in size of the pump, with respect to the impeller having one blade or one flow channel.SOLUTION: A reaction force generation plate 9 is disposed in a recessed portion 4b of an impeller 4 having one blade or one flow channel in a pump casing 7 at a lower end of a submersible motor 1, a boss portion 4e is disposed to be mounted on an end of a submersible motor shaft 2, a cover 5 is mounted on an upper end of the recessed portion 4b by a fastening tool 12 in a state of not projecting from an upper end face 4d of a main plate, a hole 5a larger than a boss portion outer side wall 4h is formed on the cover, the water is introduced into the recessed portion 4b by communicating between the inside and outside of the recessed portion 4b, and a joining portion of the cover 5 and an annular groove 4g is sealed by a seal material 11. |
