# US 11,306,602 B2 · Guide vane and fluid machine

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- Number: US 11,306,602 B2
- Document ID: US11306602B2
- Status: Granted
- Kind: B2
- Application number: 17/152,198
- Filed: 2021-01-19
- Published: 2021-05-13
- Granted: 2022-04-19
- Earliest claimed: 2017-11-09
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation
- Inventors: Hideyuki Kawajiri; Yoshihiro Ishikawa; Hajime Koyama; Yukito Yada
- Web page: https://patentgrep.com/patent/US11306602B2

## CPC

- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F01D 5/145: {Means for influencing boundary layers or secondary circulations (for compressors F04D29/68)}
- F01D 17/162: {for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line (F01D17/167 takes precedence)}
- F05D 2210/11: liquid, i.e. incompressible
- F05D 2220/30: in turbines
- F05D 2240/12: Fluid guiding means, e.g. vanes
- F05D 2240/124: related to the suction side of a stator vane
- Y02E 10/20: Hydro energy
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In a guide vane according to an embodiment of the invention, where in a section perpendicular to a guide vane rotation axis, a curvature of a contour line forming a runner side vane surface of the guide vane is referred to as a positive curvature when the contour line is formed to be convex, while the curvature of the contour line is referred to as a negative curvature when the contour line is formed to be concave, a negative curvature portion where the curvature of the contour line becomes negative is provided on the runner side vane surface. The negative curvature portion is formed from an upper end portion to a lower end portion of the runner side vane surface.

## Claims

### Claim 1

A guide vane provided on an outer circumferential side of a runner of a fluid machine to control a flow rate of water into the runner by rotating about a guide vane rotation axis,
wherein, where in a section perpendicular to the guide vane rotation axis, a curvature of a contour line forming a runner side vane surface of the guide vane is referred to as a positive curvature when the contour line is formed to be convex, while the curvature of the contour line forming the runner side vane surface of the guide vane is referred to as a negative curvature when the contour line is formed to be concave, a negative curvature portion where the curvature of the contour line becomes negative is provided on the runner side vane surface, and
wherein the negative curvature portion is formed from an upper end portion to a lower end portion of the runner side vane surface,
wherein an inlet non-negative curvature portion where the curvature of the contour line becomes positive or zero is provided at a portion lying closer to an inlet end than the negative curvature portion, and
wherein an outlet non-negative curvature portion where the curvature of the contour line becomes positive is provided at a portion lying closer to an outlet end than the negative curvature portion,
wherein when L0 denotes a length of the negative curvature position along the contour line which extends from the inlet end to the outlet end and L denotes a length from the inlet end to an arbitrary position along the contour line, the negative curvature portion is formed on at least part of a range of L which satisfies L/L0≤0.8, and the outlet non-negative curvature portion is formed on a range of L which satisfies 0.8<L/L0.

### Claim 2 (depends on 1)

The guide vane according to claim 1,
wherein the negative curvature portion is disposed at a portion of the runner side vane surface lying closer to the outlet end than a contact point where the other guide vane is brought into contact when the guide vanes are closed fully.

### Claim 3 (depends on 2)

The guide vane according to claim 2,
wherein, where a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a first section perpendicular to the guide vane rotation axis is referred to as a first curvature maximum value, while a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a second section lying below the first section and parallel to the first section is referred to as a second curvature maximum value, the second curvature maximum value is larger than the first curvature maximum value.

### Claim 4 (depends on 1)

The guide vane according to claim 1,
wherein the negative curvature portion is disposed at a portion of the runner side vane surface lying closer to the outlet end than a contact point where the other guide vane is brought into contact when the guide vanes are closed fully.

### Claim 5 (depends on 4)

The guide vane according to claim 4,
wherein, where a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a first section perpendicular to the guide vane rotation axis is referred to as a first curvature maximum value, while a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a second section lying below the first section and parallel to the first section is referred to as a second curvature maximum value, the second curvature maximum value is larger than the first curvature maximum value.

### Claim 6 (depends on 1)

The guide vane according to claim 1,
wherein, where a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a first section perpendicular to the guide vane rotation axis is referred to as a first curvature maximum value, while a maximum value of an absolute value of the curvature of the contour line at the negative curvature portion in a second section lying below the first section and parallel to the first section is referred to as a second curvature maximum value, the second curvature maximum value is larger than the first curvature maximum value.

### Claim 7 (depends on 1)

A fluid machine comprising:
the runner; and
the guide vane according to claim 1, the guide vane being provided on the outer circumferential side of the runner.