US 8,784,046 B2 · Turbine

Abstract

The turbine is provided with a blade (50) and a structure body (11) which rotates relatively with respect to the blade (50). A stepped part (52A) having a step surface (53A) is installed at one of the leading end of the blade (50) and the structure body (11) corresponding to the leading end thereof, while a seal fin (15A) which extends toward the stepped part (52A) to form a small space (H) is installed at the other of them. A cavity (C1) is formed between the blade (50) and the structure body (11) and also between the seal fin (15A) and the partition wall which faces thereto in the rotating shaft direction of the structure body (11) on the upstream side. When a distance of the cavity (C1) between the partition wall and the seal fin (15A) is given as a cavity width (W), and a distance between the seal fin (15A) and the end edge (55) of the stepped part (52A) in the rotating shaft direction on the upstream side is given as (L), at least one of the distances (L) satisfies the following formula (1). 0.7H≦L≦0.3W (1).

Claims12

Dependent claims

A turbine for converting energy of a fluid to rotational energy, the turbine comprising:

a blade;
a structure body which has a space between the structure body and the leading end of the blade and rotates relatively with respect to the blade;
a stepped part which is installed at the leading end of the blade and comprising a step surface to project toward the structure body;
a seal fin which is installed at the structure body to extend toward the stepped part;
a partition wall which faces the seal fin at the upstream side of the flow of the fluid in a direction parallel to the blade or a rotating shaft of the structure body;
and
a cavity which is formed between the leading end of the blade and the structure body and also between the partition wall and the seal fin;
wherein
when a small space formed between the seal fin and the stepped part is given as H,
a distance between the partition wall and the seal fin which form the cavity is given as a cavity width W, and
a distance between the seal fin and the end edge of the stepped part on the upstream side is given as L, at least one of the distances L satisfies the following formula (1).
0.7H≦L≦0.3W (1).

9 more elements

A turbine for converting energy of a fluid to rotational energy, the turbine comprising:

a blade;
a structure body which has a space between the structure body and the leading end of the blade and rotates relatively with respect to the blade;
a stepped part which is installed at the structure body and having a step surface to project toward the leading end of the blade;
a seal fin which is installed at the leading end of the blade to extend toward the stepped part;
a partition wall which faces the seal fin at the upstream side of the flow of the fluid in a direction parallel to the blade or a rotating shaft of the structure body;
and
a cavity which is formed between the leading end of the blade and the structure body and also between the partition wall and the seal fin;
wherein
when a small space formed between the seal fin and the stepped part is given as H,
a distance between the partition wall and the seal fin which form the cavity is given as a cavity width W, and
a distance between the seal fin and the end edge of the stepped part on the upstream side is given as L, at least one of the distances L satisfies the following formula (1).
0.7H≦L≦0.3W (1).

9 more elements

Dependencies are inferred from the claim text.

Turbine

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Turbine

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Abstract

Claims12