Centrifugal fan

Patent metadata

Field	Value
Publication number	US-10132328-B2
Application number	US-201615246178-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Aug 26, 2015
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A centrifugal fan including first blades and second blades disposed at both sides of a main plate, respectively, and a first convex part and a second convex part formed at a fan housing to correspond to the first blades and the second blades, respectively, wherein an airflow generated by the first blades and an airflow generated by the second blades are guided to be divided into the first convex part and the second convex part, respectively.

First claim

What is claimed is:

1. A centrifugal fan comprising:
a rotatable impeller; and
a fan housing to accommodate the impeller, the fan housing having a first inlet and a second inlet to respectively intake air along a rotation axis of the impeller, and an outlet to exhaust air in a direction perpendicular to the rotation axis,
wherein the fan housing comprises:
a first plate having the first inlet,
a second plate forming a space with the first plate to accommodate the impeller, the second plate having the second inlet, and
a sidewall connecting the first plate to the second plate, the sidewall expanding at an outer side of the impeller in a circumferential direction to guide air flowed through the first and second inlets to the outlet,

wherein the impeller comprises:
a main plate having a first side facing the first inlet and a second side facing the second inlet,
a plurality of first blades arranged at the first side in a circumferential direction, and
a plurality of second blades arranged at the second side in a circumferential direction, and

wherein the sidewall comprises:
a first convex part protruding away from the rotation axis, the first convex part expanding outside the first blades in a circumferential direction, and
a second convex part protruding away from the rotation axis, the second convex part expanding outside the second blades in a circumferential direction,

wherein the sidewall comprises a curved section extending in a circumferential direction, and the first convex part and the second convex part are formed at the curved section such that each of inner circumferential surfaces of the first convex part and the second convex part forms a curved surface,
wherein, the first convex part and the second convex part are connected to each other, and on an inner circumferential surface of the sidewall, a connecting part between the inner circumferential surface of the first convex part and the inner circumferential surface of the second convex part is closest to the rotation axis,
wherein a first space between the first blades and the first convex part and a second space between the second blades and the second convex part are communicated with each other through a clearance between the connecting part and the impeller,
wherein the curved surface of the first convex part includes a first section which comes closer to the rotation axis toward an opposite side of the first plate,
wherein the curved surface of the second convex part includes a second section which comes closer to the rotation axis toward an opposite side of the second plate, and
wherein the connecting part is defined where the first section and the second section meet.

2. The centrifugal fan of claim 1 , wherein the first convex part and the second convex part respectively expand in the rotation direction of the impeller.

3. The centrifugal fan of claim 2 , wherein each of the first convex part and the second convex part in the curved section comprises an anticline increase section, where the inner surface is gradually distanced away from the rotation axis, and an anticline decrease section, where the inner surface gradually approaches the rotation axis after passing through the anticline increase section.

4. The centrifugal fan of claim 1 , wherein the cross-sectional surfaces are provided by cutting the sidewall in a parallel direction with the rotation axis.

5. The centrifugal fan of claim 4 , wherein at each cross-sectional surface, a first maximum convex point is disposed at a section corresponding to a length of each first blade, whereby the inner surface of the first convex part is farthest away from the rotation axis.

6. The centrifugal fan of claim 5 , wherein at each cross-sectional surface, a second maximum convex point is disposed at a section corresponding to a length of each second blade, whereby the inner surface of the second convex part is farthest away from the rotation axis.

7. The centrifugal fan of claim 6 , wherein, in each of the cross-sectional surfaces, the first maximum convex point is disposed at a common first plane perpendicular to the rotation axis, and the second maximum convex point is disposed at a common second plane perpendicular to the rotation axis.

8. The centrifugal fan of claim 6 , wherein the inner surface of the first convex part and the inner surface of the second convex part are symmetrical about a plane perpendicular to the rotation axis.

9. The centrifugal fan of claim 8 , wherein a length of each of the plurality of first and second blades is identical.

10. The centrifugal fan of claim 5 , further comprising:
a connecting part provided between the first convex part and the second convex part, the connecting part being disposed at a plane perpendicular to the rotation axis.

11. The centrifugal fan of claim 1 , wherein the impeller generates airflow by the plurality of first and second blades at both sides of the main plate, whereby the airflow generated by each of the plurality of first and second blades is divided into the first convex part and the second convex part.

Assignees

• Lg Electronics Inc

Inventors

• Cho Namjoon
• Lee Kamgyu
• Yang Dongkeun
• Chung Baikyoung

Classifications

• F04D27/006

  by influencing fluid temperatures · CPC title

• F04D29/424 Primary

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• F04D29/663

  Sound attenuation · CPC title

• F04D29/441

  especially adapted for elastic fluid pumps · CPC title

• F04D17/162 Primary

  Double suction pumps · CPC title