# US 10,480,339 B2 · Sealing assembly

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- Number: US 10,480,339 B2
- Document ID: US10480339B2
- Status: Granted
- Kind: B2
- Application number: 15/299,682
- Filed: 2016-10-21
- Published: 2017-04-27
- Granted: 2019-11-19
- Earliest claimed: 2015-10-23
- Assignees: Doosan Heavy Industries Construction Co., Ltd
- Applicants: Doosan Heavy Industries Construction Co., Ltd.
- Inventors: Kyung Kook Kim
- Web page: https://patentgrep.com/patent/US10480339B2

## CPC

- F01D 11/02: by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08)
- F01D 11/04: using sealing fluid, e.g. steam
- F16J 15/406: {by at least one pump}
- F16J 15/4472: {with axial path}
- F05D 2220/31: in steam turbines
- F05D 2240/55: Seals
- F05D 2250/15: spiral
- F05D 2250/25: helical
- 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
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A sealing assembly includes a first sealing member disposed on a fixed body and a second sealing member disposed on a rotating body while facing the first sealing member, such that when the second sealing member rotates, the first sealing member and the second sealing member work in conjunction with each other to generate flow of fluid in a reverse direction and form a fluid barrier, thereby preventing leakage of the fluid.

## Claims

### Claim 1

A sealing assembly, comprising:
a first sealing member disposed on an inner circumferential surface of a fixed body;
a second sealing member disposed on an outer circumferential surface of a rotating body configured to rotate with respect to the first sealing member, the second sealing member including
a sealing body part disposed on the outer circumferential surface of the rotating body, and
a tooth part disposed on the sealing body part and including a spiral, the spiral including a spiral segment having opposite ends offset from each other; and
a fluid barrier formed between the first sealing member and the second sealing member by transfer fluid flowing in a direction reverse to a direction of a fluid leak,
wherein the spiral includes a step portion connecting the opposite ends of the spiral segment, the step portion configured to push rotating fluid toward an introduction side of the leaked fluid to form the fluid barrier in a gap between the first sealing member and the second sealing member.

### Claim 2 (depends on 1)

The sealing assembly of claim 1, wherein the step portion is connected to either of the opposite ends of the spiral segment at a predetermined angle.

### Claim 3 (depends on 1)

The sealing assembly of claim 1, wherein the opposite ends of the spiral segment include a first end and a second end, the second end disposed closer to the introduction side of the leaked fluid than the first end, and wherein the pushed fluid travels along the spiral from the first end to the second end by passing over the step portion.