| CPC F04D 13/0606 (2013.01) [F04D 29/426 (2013.01); F04D 29/428 (2013.01)] | 9 Claims |
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1. A submersible pump in which a one-sided waterway extending along a rotation shaft is provided on one side of a submersible pump main body, the submersible pump comprising:
an impeller attached to one end of the rotation shaft; and
a pump casing in which the impeller is arranged,
wherein the pump casing includes
a tongue portion that is arranged between a pump chamber in which the impeller is arranged and an inlet opening of the one-sided waterway when viewed from an axial direction of the rotation shaft, and
a connection waterway that is provided between the tongue portion and an inner surface of the pump casing, and is directly connected to the inlet opening of the one-sided waterway from an upstream side when viewed from the axial direction of the rotation shaft,
the submersible pump further comprises a motor including a motor frame provided to the pump casing from a side opposite to a suction port in the axial direction of the rotation shaft,
the motor frame includes a first frame portion forming a motor chamber inside, and a second frame portion forming a portion of the one-sided waterway,
the second frame portion of the motor frame is provided with a reduced portion of which an external shape is decreased from a downstream side toward the upstream side along with a flow path sectional area of the one-sided waterway being continuously decreased from the motor frame on the downstream side toward the pump casing on the upstream side, and
an arrangement space for a plurality of fixing fasteners for fixing the pump casing and the motor frame is provided to surround the reduced portion.
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