# US 11,905,838 B2 · Seal member and rotary machine

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- Number: US 11,905,838 B2
- Document ID: US11905838B2
- Status: Granted
- Kind: B2
- Application number: 17/628,636
- Filed: 2020-07-16
- Published: 2022-08-18
- Granted: 2024-02-20
- Earliest claimed: 2019-07-23
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Tatsuro Furusho; Shin Nishimoto; Hidekazu Uehara; Kohei Ozaki; Azumi Yoshida
- Web page: https://patentgrep.com/patent/US11905838B2

## CPC

- F01D 11/08: for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20)
- F01D 11/02: by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08)
- F02C 7/28: Arrangement of seals
- F05D 2240/55: Seals
- Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A seal member is disposed between a rotor and a stator to provide a seal between the rotor and the stator. The seal member comprises: a rotary-side member fixed to a surface of the rotor opposing the stator; a fixed-side member fixed to the stator and facing the rotary-side member; and a first fin and a second fin which are disposed on one of the rotary-side member and the fixed-side member, the first fin protruding on the opposing surface side, the second fin being disposed on a lower pressure side in a rotating axis direction relative to the first fin and protruding on the opposing surface side. The thickness, in the rotating axis direction, of the second fin at the root thereof is greater than the thickness, in the rotating axis direction, of the first fin at the root thereof.

## Claims

### Claim 1

A seal member disposed between a rotor and a stator to seal a portion between the rotor and the stator, comprising:
a rotary-side member fixed to a facing surface of the rotor which faces the stator;
a fixed-side member fixed to the stator to face the rotary-side member;
a first fin provided in any one of the rotary-side member and the fixed-side member and protruding to a facing surface side; and
a second fin disposed on a low-pressure side in a rotation axis direction from the first fin, and protruding to the facing surface side,
wherein a thickness of the second fin at a root in the rotation axis direction is thicker than a thickness of the first fin at a root in the rotation axis direction,
wherein the first fin is an attachment type fin separate from an installed member, and the second fin is a fixed type fin integrated with the installed member.

### Claim 2 (depends on 1)

The seal member according to claim 1,
wherein a tip thickness of the second fin in the rotation axis direction is thicker than a tip thickness of the first fin in the rotation axis direction.

### Claim 3 (depends on 1)

The seal member according to claim 1,
wherein the second fin is formed of a material having higher strength than that of the first fin.

### Claim 4 (depends on 1)

The seal member according to claim 1,
wherein in the rotation axis direction, the second fin is disposed on a low-pressure side from a central position in the rotation axis direction of the rotary-side member or the fixed-side member.

### Claim 5 (depends on 1)

The seal member according to claim 1,
wherein in the rotation axis direction, the second fin is disposed on a low-pressure side from all of the first fins.

### Claim 6 (depends on 1)

The seal member according to claim 1, further comprising:
at least one auxiliary fixed-side member fixed to the stator to be aligned with the fixed-side member, and provided with a fin protruding to the facing surface side; and
an auxiliary rotary-side member fixed to the rotor at a position facing the auxiliary fixed-side member, and provided with a fin protruding to the facing surface side.

### Claim 7 (depends on 6)

The seal member according to claim 6,
wherein the auxiliary fixed-side member is disposed on a high-pressure side in the rotation axis direction from the fixed-side member.

### Claim 8 (depends on 1)

The seal member according to claim 1,
wherein any one of the rotary-side member and the fixed-side member further has a protrusion portion having a protrusion amount smaller than that of the first fin and the second fin.

### Claim 9 (depends on 1)

A rotary machine comprising:
the seal member according to claim 1;
a rotor; and
a stator.