Runner vane of axial hydraulic machine, runner of axial hydraulic machine, and axial hydraulic machine

Patent metadata

Field	Value
Publication number	US-10012206-B2
Application number	US-201514963711-A
Country	US
Kind code	B2
Filing date	Dec 9, 2015
Priority date	Feb 24, 2015
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A runner vane of an axial hydraulic machine according to embodiments described herein includes a center-side vane part provided on a radial center side and defined by a center-side camber line, and a boss-side vane part provided at a side edge on a side of a runner boss and defined by a boss-side camber line. As determined by the flow direction of a turbine, a curvature of an upstream side portion of the boss-side camber line is larger than a curvature of an upstream side portion of the center-side camber line. An upstream end of the boss-side vane part is positioned on a side of a rotation direction of a runner in comparison with an upstream end of the center-side vane part when viewed toward a downstream side along a rotation axis line of the runner.

First claim

The invention claimed is:

1. A runner vane of an axial hydraulic machine, the runner vane being provided between a runner boss connected to a rotary main shaft and a shroud surrounding a runner, comprising:
a center-side vane part provided on a radial center side and defined by a center-side camber line;
a boss-side vane part provided at a side edge on a side of the runner boss and defined by a boss-side camber line; and
a shroud-side vane part provided on a side edge on a side of the shroud and defined by a shroud-side camber line,
wherein, as determined by a flow direction of a turbine, a curvature of an upstream side portion of the boss-side camber line is larger than a curvature of an upstream side portion of the center-side camber line, and an upstream end of the boss-side vane part is positioned on a side in a rotation direction of the runner in comparison with an upstream end of the center-side vane part when viewed toward a downstream side along a rotation axis line of the runner, and
wherein a curvature of an upstream side portion of the shroud-side camber line is larger than a curvature of an upstream side portion of the center-side camber line.

2. The runner vane of the axial hydraulic machine according to claim 1 , wherein, in a case where a total vane length of the center-side vane part is denoted by Lc, an angle of the center-side camber line at an upstream end of the center-side vane part is denoted by βc 1 , and the angle of the center-side camber line at a downstream end of the center-side vane part is denoted by βc 2 , a position xc where an angle of the center-side camber line is denoted by (βc 1 +βc 2 )/2 is within 0.25<(xc/Lc)<0.75 from the upstream end, and in a case where a total vane length of the boss-side vane part is denoted by Lb, an angle of the boss-side camber line at an upstream end of the boss-side vane part is denoted by βb 1 , and the angle of the boss-side camber line at a downstream end of the boss-side vane part is denoted by βb 2 , a position xb where an angle the boss-side camber line is denoted by (βb 1 +βb 2 )/2 is within a range of 0<(xb/Lb)<0.2 from the upstream end.

3. The runner vane of the axial hydraulic machine according to claim 1 , wherein an upstream end of the shroud-side vane part is positioned on a side opposite to the rotation direction of the runner in comparison with an upstream end of the center-side vane part when viewed toward a downstream side along the rotation axis line of the runner.

4. The runner vane of the axial hydraulic machine according to claim 3 , wherein a curvature of an upstream side portion of the boss-side camber line is larger than a curvature of an upstream side portion of the shroud-side camber line.

5. A runner of an axial hydraulic machine, comprising:
the runner boss; and
the runner vane of the axial hydraulic machine according to claim 1 .

6. An axial hydraulic machine, comprising:
the shroud; and
the runner of the axial hydraulic machine according to claim 5 .

7. A runner vane of an axial hydraulic machine, the runner vane being provided between a runner boss connected to a rotary main shaft and a shroud surrounding a runner, comprising:
a center-side vane part provided on a radial center side and defined by a center-side camber line; and
a shroud-side vane part provided at a side edge on a side of the shroud and defined by a shroud-side camber line,
wherein, as determined by a flow direction of a turbine, a curvature of an upstream side portion of the shroud-side camber line is larger than a curvature of an upstream side portion of the center-side camber line, and an upstream end of the shroud-side vane part is positioned on a side opposite to a rotation direction of the runner in comparison with an upstream end of the center-side vane part when viewed toward a downstream side along a rotation axis line of the runner.

8. A runner of an axial hydraulic machine, comprising:
the runner boss; and
the runner vane of the axial hydraulic machine according to claim 7 .

9. An axial hydraulic machine, comprising:
the shroud; and
the runner of the axial hydraulic machine according to claim 8 .

Assignees

• Toshiba Kk

Inventors

• Ko Pohan
• Hamaguchi Koji

Classifications

• F03B3/06

  with adjustable blades, e.g. Kaplan turbines {(rotors per se F03B3/14)} · CPC title

• Y02E10/223

  Cross-Sectional Technologies · mapped topic

• F03B3/04

  with substantially axial flow throughout rotors, e.g. propeller turbines {(rotors per se F03B3/126)} · CPC title

• F03B3/121 Primary

  Blades, their form or construction · CPC title

• F03B3/123 Primary

  specially designed as adjustable blades, e.g. for Kaplan-type turbines · CPC title