Patent ID: 9334885
Filing Date: 2016-05-10
CPC Classification: E03B,F04B,F04D,F15D

Claim Text:
1. A pump suction pipe comprising: a suction pipe outlet portion having an outlet that is connected to an impeller suction port of a pump, and which has a central axis which is substantially vertical; a suction pipe inlet portion having an inlet that is connected to a headrace, and which has a central axis which is substantially horizontal, wherein a diameter of the inlet is larger than a diameter of the outlet; and a suction pipe bent portion that connects the suction pipe outlet portion and the suction pipe inlet portion to each other and changes a flow of fluid through the suction pipe inlet portion to the suction pipe outlet portion from a horizontal direction to a vertical direction, wherein the pump causes the fluid to flow in from the headrace to the suction pipe inlet portion horizontally, flow through the suction pipe bent portion, and flow out from the suction pipe outlet portion vertically towards the impeller suction port, wherein the suction pipe bent portion includes a suction pipe bent portion outlet that defines an outlet-side reference plane orthogonal to the central axis of the suction pipe outlet portion where the suction pipe bent portion outlet connects to the suction pipe outlet portion, wherein the suction pipe bent portion includes a suction pipe bent portion inlet that defines an inlet-side reference plane orthogonal to the central axis of the suction pipe inlet portion plane where the suction pipe inlet portion connects to the suction pipe bent portion inlet, and wherein an intersection of a vertical cross-sectional plane of the pump suction pipe, the outlet-side reference plane, and the inlet-side reference plane is set as a reference point, and a distance from the reference point to an inner end of the suction pipe bent portion in the vertical cross-sectional plane monotonically increases from the inlet-side reference plane to the outlet-side reference plane.