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US 12,378,939 B2Granted
Hydraulic machine
AssigneeYumes Frontier Inc.
InventorYu Hayashi
Life of this patent
Estimating the term…
Abstract
A hydraulic machine includes a casing and a runner. The casing includes a main flow path and a fixed flow path. The main flow path is disposed outward and has a spiral shape. An inner diameter decreases toward a center of the spiral. The fixed flow path is disposed inward and introduces water from the main flow path into the runner. The runner is connected to a main shaft along a rotation axis of the runner and includes a plurality of runner vanes. At least one of the plurality of runner vanes has a pressure surface that receives pressure in an inflow direction from the water flowing into the runner through the fixed flow path. In a cross section of the runner vane perpendicular to a direction of the rotation axis, an outlet angle is 0° or more and less than 20°.
Claims5
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 runner is connected to a main shaft along a rotation axis of the runner and includes a plurality of runner vanes disposed apart from each other in a circumferential direction, and
- at least one of the plurality of runner vanes has a pressure surface that receives pressure in an inflow direction from the water flowing into the runner through the fixed flow path, and, in a cross section of the runner vane perpendicular to a direction of the rotation axis, an outlet angle is 0° or more and less than 20°, the outlet angle being formed between a tangent at a tip portion on an outlet side of the water of the pressure surface and a line segment connecting the rotation axis and the tip portion on the outlet side of the pressure surface,
- wherein the fixed flow path is formed by a plurality of stay vanes disposed apart from each other on a concentric circle,
- 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,
- wherein 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 flow path width sequentially decreases toward the center of the spiral of the main flow path, and
- a reduction rate D1 of the flow path width is expressed by the following formula (1),
- D
-
- 1
- =
- -
- 2
-
- (
- L
- -
- YN
- -
- SN
- )
- /
- YN
-
- (
- N
- -
- 1
- )
- (
- 1
- )
- where, N is the number of the stay vanes,
- Y is a first flow path width disposed between a first stay vane extending from the inflow portion and a second stay vane adjacent to the first stay vane in a water-flowing direction,
- D1 is a reduction rate of the flow path widths adjacent to each other,
- S is a length of an arc on an inner peripheral side of the stay vane, and
- L is a length of an inner periphery of a surface of the casing in sliding contact with the runner.
38 more elements
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 runner is connected to a main shaft along a rotation axis of the runner and includes a plurality of runner vanes disposed apart from each other in a circumferential direction, and
- at least one of the plurality of runner vanes has a pressure surface that receives pressure in an inflow direction from the water flowing into the runner through the fixed flow path, and, in a cross section of the runner vane perpendicular to a direction of the rotation axis, an outlet angle is 0° or more and less than 20°, the outlet angle being formed between a tangent at a tip portion on an outlet side of the water of the pressure surface and a line segment connecting the rotation axis and the tip portion on the outlet side of the pressure surface,
- wherein the fixed flow path is formed by a plurality of stay vanes disposed apart from each other on a concentric circle,
- 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,
- wherein 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 flow path,
- the flow path width sequentially increases toward the center of the spiral of the main flow path, and
- an increase rate D2 of the flow path width is expressed by the following formula (2)
- D
-
- 2
- =
- 2
-
- (
- L
- -
- YN
- -
- SN
- )
- /
- YN
-
- (
- N
- -
- 1
- )
- (
- 2
- )
- where, N is the number of the stay vanes,
- Y is a first flow path width disposed between a first stay vane extending from the inflow portion and a second stay vane adjacent to the first stay vane in a water flowing direction,
- D2 is an increase rate of the flow path widths adjacent to each other,
- S is a length of an arc on an inner peripheral side of the stay vane, and
- L is a length of an inner periphery of a surface of the casing in sliding contact with the runner.
37 more elements
Dependencies are inferred from the claim text.