Hydraulic machine

A hydraulic machine comprising:

• a casing;
• and a runner rotatably disposed in a central portion of the casing, wherein
• the casing internally includes a main flow path and a fixed flow path, the main flow path being a flow path disposed outward and having a spiral shape and an inner diameter that decreases toward a center of the spiral, the fixed flow path being disposed inward and introducing water from the main flow path into the runner, and
• the main flow path includes an inflow portion having an inner diameter that is largest in the main flow path and a terminal end portion having an inner diameter that is smallest in the main flow path, the terminal end portion being not connected directly to the inflow portion in the main flow path.

A hydraulic machine comprising:

• a casing;
• and a runner rotatably disposed in a central portion of the casing, wherein
• the casing internally includes a main flow path and a fixed flow path, the main flow path being a flow path disposed outward and having a spiral shape and an inner diameter that decreases toward a center of the spiral, the fixed flow path being disposed inward and introducing water from the main flow path into the runner,
• the fixed flow path is formed by a plurality of stay vanes disposed apart from each other on a concentric circle, and
• a flow path width sequentially changes toward the center of the spiral of the main flow path, the flow path width being a length of an arc on an inner peripheral side of the fixed flow path disposed between the adjacent stay vanes among the plurality of stay vanes.