# US 2019/0376403 A1 · Axial turbomachinery

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- Number: US 2019/0376403 A1
- Document ID: US20190376403A1
- Status: Published application
- Kind: A1
- Application number: 16/487,200
- Filed: 2018-02-23
- Published: 2019-12-12
- Earliest claimed: 2017-02-23
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Eiji Konishi; Yoshihiro Kuwamura; Kazuyuki Matsumoto; Shinji Fukao; Hideaki Sugishita
- Web page: https://patentgrep.com/patent/US20190376403A1

## CPC

- F01D 11/08: for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20)
- F16J 15/4472: {with axial path}
- F01D 5/20: Specially-shaped blade tips to seal space between tips and stator {(F01D5/225 takes precedence)}
- F01D 5/225: {by shrouding}
- F01D 9/04: forming ring or sector
- F02C 7/28: Arrangement of seals
- F16J 15/447: Labyrinth packings
- F05D 2240/307: related to the tip of a rotor blade
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

In an axial turbomachinery related to the invention, a structural body has a casing fin, a blade is provided with an upstream inclined surface that is inclined from an upstream side toward a downstream side, the structural body is provided with an upstream inclined inner wall surface that is inclined from the upstream side the downstream side, an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and an end position of the upstream inclined surface on a radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.

## Claims

### Claim 1

An axial turbomachinery comprising:
a blade that is disposed in a flow channel through which a main flow of a fluid flows and has a shroud at a distal end thereof; and
a structural body that is provided via a gap on a distal side of the blade and is configured to rotate relative to the blade,
wherein the structural body has a contraction flow member that protrudes toward the shroud to form a minute gap between the contraction flow member and the shroud,
wherein the blade has an upstream inclined surface on an end surface of the shroud facing the upstream side, the upstream inclined surface being inclined from an upstream side to a downstream side toward a radially outer side,
wherein the structural body is provided with an upstream inclined inner wall surface that is disposed on the upstream side of the shroud and is inclined from the upstream side toward the downstream side toward a radially outer side, at a position facing the shroud in a direction in which the main flow flows,
wherein an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and
wherein an end position of the upstream inclined surface on the radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.

### Claim 2 (depends on 1)

The axial turbomachinery according to claim 1,
wherein the upstream inclined surface has a curved concave surface that forms a concave shape toward the downstream side.

### Claim 3 (depends on 1)

The axial turbomachinery according to claim 1,
wherein the blade has an downstream inclined surface on an end surface of the shroud facing the downstream side, the downstream inclined surface being inclined from the upstream side to the downstream side toward the radially inner side, and
wherein the structural body is provided with a downstream inclined inner wall surface that is disposed on the downstream side of the shroud and is inclined from the upstream side toward the downstream side toward the radially inner side, at a position facing the shroud in the direction in which the main flow flows.

### Claim 4 (depends on 3)

The axial turbomachinery according to claim 3,
wherein an end position of the downstream inclined surface on the radially outer side is located radially outside an end position of the downstream inclined inner wall surface on the radially inner side.

### Claim 5 (depends on 3)

The axial turbomachinery according to claim 3,
wherein the downstream inclined surface has a curved convex surface that forms a convex shape toward the downstream side.

### Claim 6 (depends on 5)

The axial turbomachinery according to claim 5,
wherein the curved convex surface is a rounded surface, and a curvature radius of the rounded surface is smaller than ½ of the radial dimension of the end surface of the shroud facing the downstream side.