# US 11,078,803 B2 · Axial flow rotating machinery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,078,803 B2
- Document ID: US11078803B2
- Status: Granted
- Kind: B2
- Application number: 16/634,430
- Filed: 2019-01-29
- Published: 2020-05-28
- Granted: 2021-08-03
- Earliest claimed: 2018-01-31
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Rimpei Kawashita; Makoto Iwasaki; Makoto Kamishita; Kazuyuki Matsumoto
- Web page: https://patentgrep.com/patent/US11078803B2

## CPC

- F01D 11/02: by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08)
- F16J 15/4472: {with axial path}
- F01D 11/08: for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20)
- F02C 7/28: Arrangement of seals
- F16J 15/447: Labyrinth packings
- F05D 2240/126: Baffles or ribs
- 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

An axial flow rotating machinery includes: a rotor; a casing; a rotating-blade stage including rotating blades and a radially-outer side rotating blade ring continuing to radially outer ends of the rotating blades; and a rotating-blade side seal device configured to seal a gap between the radially-outer side rotating blade ring and the casing. The rotating-blade side seal device includes: a seal fin having an annular shape and extending toward an outer peripheral surface of the radially-outer side rotating blade ring from the casing; and a swirl brake fixed to the casing in a cavity formed at an upstream side of the seal fin. The swirl brake includes: a first plate-shaped member having a surface along a radial direction of the rotor; and a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor.

## Claims

### Claim 1

An axial flow rotating machinery, comprising:
a rotor configured to rotate about an axis;
a casing accommodating the rotor so as to be rotatable;
a rotating-blade stage including rotating blades fixed to the rotor at intervals in a circumferential direction and a radially-outer side rotating blade ring continuing to radially outer ends of the rotating blades; and
a rotating-blade side seal device configured to seal a gap between the radially-outer side rotating blade ring and the casing,
wherein the rotating-blade side seal device includes:
a seal fin having an annular shape and extending toward an outer peripheral surface of the radially-outer side rotating blade ring from the casing; and
a swirl brake fixed to the casing in a cavity formed at an upstream side of the seal fin, and
wherein the swirl brake includes:
a first plate-shaped member having a surface along a radial direction of the rotor, the first plate-shaped member extending along the axis or extending in a direction which interests with the axis such that a leading edge of the first plate-shaped member is positioned upstream of a trailing edge of the first plate-shaped member in a rotational direction of the rotor; and
a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor, the second plate-shaped member extending from an inner end of the first plate-shaped member toward a downstream side in the rotational direction of the rotor and the third plate-shaped member extending from the inner end of the first plate-shaped member toward an upstream side in the rotational direction of the rotor.

### Claim 2 (depends on 1)

The axial flow rotating machinery according to claim 1, wherein an intersection angle between an extension direction of the first plate-shaped member and the axis is not smaller than 30 angular degrees and not greater than 60 angular degrees.

### Claim 3 (depends on 1)

The axial flow rotating machinery according to claim 1, wherein the first plate-shaped member extends along the axis.

### Claim 4 (depends on 1)

The axial flow rotating machinery according to claim 1, wherein the swirl brake includes the first plate-shaped member, the second plate-shaped member, and the third plate-shaped member disposed at an upstream side of the second plate-shaped member.

### Claim 5 (depends on 4)

The axial flow rotating machinery according to claim 4,
wherein the swirl brake includes a single plate member,
wherein the second plate-shaped member and the third plate-shaped member are configured to be capable of bending with respect to the first plate-shaped member independently from one another, and
wherein, on the inner end of the first plate-shaped member, a first bending portion which causes the second plate-shaped member to extend toward the downstream side in the rotational direction of the rotor and a second bending portion which causes the third plate-shaped member toward the upstream side in the rotational direction of the rotor are formed.

### Claim 6 (depends on 4)

The axial flow rotating machinery according to claim 4,
wherein the second plate-shaped member is formed so as to extend such that a distance from the inner end of the first plate-shaped member toward the downstream side in the rotational direction of the rotor becomes longer toward a downstream side in an axial direction, and
wherein the third plate-shaped member is formed so as to extend such that a distance from the inner end of the first plate-shaped member toward the upstream side in the rotational direction of the rotor becomes longer toward an upstream side in the axial direction.

### Claim 7 (depends on 1)

The axial flow rotating machinery according to claim 1, further comprising:
a downstream-side guide member having an annular shape and extending toward an inner side in the radial direction of the rotor from the casing at an upstream side of the seal fin,
wherein an upstream side surface of the downstream-side guide member is formed to have a curved shape such that a length of the downstream-side guide member along the radial direction of the rotor becomes smaller toward an upstream side in an axial direction and is recessed toward the cavity.

### Claim 8 (depends on 7)

The axial flow rotating machinery according to claim 7, further comprising:
an upstream-side guide member having an annular shape and extending toward the inner side in the radial direction of the rotor from the casing at an upstream side of the downstream-side guide member,
wherein a downstream side surface of the upstream-side guide member is formed to have a curved shape such that a length of the upstream-side guide member along the radial direction of the rotor becomes smaller toward a downstream side in the axial direction and is recessed toward the cavity.

### Claim 9 (depends on 1)

The axial flow rotating machinery according to claim 1, further comprising:
a stator-side guide member having an annular shape and extending toward an inner side in the radial direction of the rotor from the casing at an upstream side of the seal fin,
wherein an upstream side surface of the stator-side guide member is formed to have:
a root side surface extending along the radial direction of the rotor; and
a tip side surface connected to an inner side of the root side surface with respect to the radial direction, the tip side surface having a curved shape such that a length of the stator-side guide member along the radial direction of the rotor becomes smaller toward an upstream side in an axial direction and is recessed toward the cavity.

### Claim 10 (depends on 9)

The axial flow rotating machinery according to claim 9, further comprising:
a rotor-side guide member having an annular shape and extending toward an outer side in the radial direction of the rotor from the outer peripheral surface of the radially-outer side rotating blade ring at an upstream side of the stator-side guide member,
wherein a downstream side surface of the rotor-side guide member is formed to have a curved shape such that a length of the rotor-side guide member along the radial direction of the rotor becomes smaller toward a downstream side in the axial direction and is recessed toward the tip side surface of the stator-side guide member.

### Claim 11

An axial flow rotating machinery, comprising:
a rotor configured to rotate about an axis;
a casing accommodating the rotor so as to be rotatable;
a stator-vane stage including stator vanes fixed to the casing at intervals in a circumferential direction and a radially-inner side stator vane ring continuing to radially inner ends of the stator vanes; and
a stator-vane side seal device configured to seal a gap between the radially-inner side stator vane ring and the rotor,
wherein the stator-vane side seal device includes:
a seal fin having an annular shape and extending from an inner peripheral surface of the radially-inner side stator vane ring toward the rotor; and
a swirl brake fixed to the radially-inner side stator vane ring at an upstream side of the seal fin, and
wherein the swirl brake includes:
a first plate-shaped member having a surface along a radial direction of the rotor, the first plate-shaped member extending along the axis or extending in a direction which interests with the axis such that a leading edge of the first plate-shaped member is positioned upstream of a trailing edge of the first plate-shaped member in a rotational direction of the rotor; and
a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor, the second plate-shaped member extending from an inner end of the first plate-shaped member toward a downstream side in the rotational direction of the rotor and the third plate-shaped member extending from the inner end of the first plate-shaped member toward an upstream side in the rotational direction of the rotor.