# US 9,518,585 B2 · Fan

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- Number: US 9,518,585 B2
- Document ID: US9518585B2
- Status: Granted
- Kind: B2
- Application number: 14/024,197
- Filed: 2013-09-11
- Published: 2014-03-13
- Granted: 2016-12-13
- Earliest claimed: 2012-09-12
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seokho Choi; Yongcheol Sa
- Web page: https://patentgrep.com/patent/US9518585B2

## CPC

- F04D 19/002: {Axial flow fans}
- F04D 29/384: {characterised by form}
- F04D 29/663: {Sound attenuation}
- F04D 29/666: {by means of rotor construction or layout, e.g. unequal distribution of blades or vanes}
- F04D 29/681: {especially adapted for elastic fluid pumps}
- F05D 2240/304: related to the trailing edge of a rotor blade
- F05D 2250/182: crenellated, notched
- F05D 2250/183: zigzag
- F05D 2250/184: sinusoidal
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

Provided is a fan. The fan includes a hub and a blade extending from the hub. The blade includes a blade rear end having a predetermined curvature and a blade side end connected to the blade rear end. The blade rear end includes ridge parts protruding in a predetermined direction from an extension and furrow parts protruding in a direction opposite to the predetermined direction.

## Claims

### Claim 1

A fan, comprising:
a hub; and
a plurality of blades that extends from the hub, each of the plurality of blades including a positive-pressure surface and a negative-pressure surface opposite to the positive-pressure surface, wherein each of the plurality of blades includes a blade rear end having a predetermined curvature and a blade side end connected to die blade rear end, wherein the blade rear end includes an alternating pattern of ridges and grooves, the pattern extending along an edge of the blade rear end, wherein the ridges protrude different lengths from the positive-pressure surface and the grooves protrude different lengths from the negative-pressure surface, and wherein the ridges and the grooves have square ends.

### Claim 2 (depends on 1)

The fan according to claim 1, wherein the ridges and the grooves are alternately arranged so that sounds generating from air flowing on the ridges and the grooves cancel out each other.

### Claim 3 (depends on 1)

The fan according to claim 1, wherein a distance between an adjacent two of the ridges is equal to a distance between an adjacent two of the grooves.

### Claim 4 (depends on 1)

The fan according to claim 1, wherein the alternating pattern includes:
a first connection portion that extends from a first upper end of the pattern to a first lower end of the pattern being next to the first upper end; and
a second connection portion that extends from a second upper end of the pattern being next to the first upper end to the first lower end of the pattern.

### Claim 5 (depends on 4)

The fan according to claim 4, wherein the first connection portion is in contact with the second connection portion.

### Claim 6

A fan, comprising:
a hub; and
a plurality of blades that extends from the hub, each of the plurality of blades including a positive-pressure surface and a negative-pressure surface opposite to the positive-pressure surface, wherein each of the plurality of blades includes a blade rear end having a predetermined curvature and a blade side end connected to the blade rear end, wherein the blade rear end includes an alternating pattern of ridges and grooves, the pattern extending along an edge of the blade rear end, wherein the ridges protrude different lengths from the positive-pressure surface and the grooves protrude different lengths from the negative-pressure surface, wherein the alternating pattern includes:
a first connection portion that extends from a first upper end of the pattern to a first lower end of the pattern being next to the first upper end; and
a second connection portion that extends from a second upper end of the pattern being next to the first upper end to the first lower end of the pattern, wherein the first lower end has a width between the first connection portion and the second connection portion, and wherein the ridges and the grooves have square ends.

### Claim 7 (depends on 6)

The fan according to claim 6, wherein the first upper end has a width equal to a width of the first lower end.

### Claim 8

A fan, comprising:
a hub; and
a plurality of blades that extends from the hub, each of the plurality of blades having a positive-pressure surface and a negative-pressure surface opposite to the positive-pressure surface, wherein each of the plurality of blades includes a blade rear end having a predetermined curvature and a blade side end connected to the blade rear end, wherein the blade rear end includes:
an extension, which is an imaginary line connected from a first point at which the hub and the blade rear end meet to a second point at which the blade side end and the blade rear end meet; and
an alternating pattern of ridges and grooves, the pattern extending along the extension, wherein the ridges protrude different lengths from the positive-pressure surface and the grooves protrude different lengths from the negative-pressure surface, and wherein the ridges and the grooves have square ends.