Centrifugal fan and air conditioner having the same

Patent metadata

Field	Value
Publication number	US-2016108928-A1
Application number	US-201514879132-A
Country	US
Kind code	A1
Filing date	Oct 9, 2015
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

A centrifugal fan includes: an impeller; and a scroll housing surrounding the impeller, the scroll housing having suction hole and discharge hole formed therein. The scroll housing includes: a base plate; a scroll wall connected to the base plate, the scroll wall being formed in a scroll shape from a cutoff; and a discharge wall extending from the scroll wall. In the centrifugal fan, a flow path extending portion having a flow path sectional area extending toward an air flow direction convexly protrudes in the outer direction of the scroll housing in the base plate. Accordingly, a flow path is formed to extend in two directions including a direction in which the scroll wall extends and a direction in which the flow path extending portion protrudes. Thus, the static pressure of a discharge air current can be quickly recovered, and the blowing performance of the centrifugal fan can be improved. Further, the flow path extending portion is formed to protrude from the base plate, so that it is possible to enhance utilization of space near the flow path extending portion.

First claim

What is claimed is:

1 . A centrifugal fan comprising:
an impeller; and a scroll housing surrounding the impeller, the scroll housing having suction hole and discharge hole formed therein, wherein the scroll housing includes: a base plate; a scroll wall connected to the base plate, the scroll wall being formed in a scroll shape from a cutoff; and a discharge wall extending from the scroll wall, wherein a flow path extending portion having a flow path sectional area extending toward an air flow direction convexly protrudes in the outer direction of the scroll housing in the base plate.

2 . The centrifugal fan of claim 1 , wherein the suction hole is formed in a rear plate of the scroll housing, the discharge hole is formed at an upper portion of the scroll housing, the base plate is opposite to the rear plate, and the flow path extending portion is formed to protrude in a front direction from the base plate.

3 . The centrifugal fan of claim 1 , wherein the flow path sectional area of the flow path extending portion gradually extends along the scroll wall and the discharge wall.

4 . The centrifugal fan of claim 1 , wherein the flow path extending portion starts from the point at an angle of 180 degrees to 270 degrees from a reference angle.

5 . The centrifugal fan of claim 1 , wherein the scroll housing further includes an inner discharge guide portion spaced apart from the flow path extending portion, and
wherein the discharge hole is formed between the flow path extending portion and the inner discharge guide portion.

6 . An air conditioner having a centrifugal fan, the air conditioner comprising:
a first discharge unit having a first discharge flow path formed therein; a second discharge unit having a second discharge flow path formed therein; a first centrifugal fan for blowing air to the second discharge flow path; and a second centrifugal fan having an air duct disposed at the front of the first centrifugal fan, wherein an air passage for guiding air into the first discharge flow path is formed between the air duct and the outer surface of the first centrifugal fan, wherein each of the first and second centrifugal fans includes: an impeller; and a scroll housing surrounding the impeller, the scroll housing having suction hole and discharge hole formed therein, wherein the scroll housing includes: a base plate; a scroll wall connected to the base plate, the scroll wall being formed in a scroll shape from an cutoff; and a discharge wall extending from the scroll wall, wherein a flow path extending portion having a flow path sectional area extending toward an air flow direction convexly protrudes in the outer direction of the scroll housing in the base plate.

7 . The air conditioner of claim 6 , wherein the scroll housing of the second centrifugal fan is positioned below the scroll housing of the first centrifugal fan.

8 . The air conditioner of claim 6 , wherein the suction hole is formed in a rear plate of the scroll housing, the discharge hole is formed at an upper portion of the scroll housing, the base plate is opposite to the rear plate, and the flow path extending portion is formed to protrude in a front direction from the base plate.

9 . The air conditioner of claim 6 , wherein the flow path sectional area of the flow path extending portion gradually extends along the scroll wall and the discharge wall.

10 . The air conditioner of claim 6 , wherein the flow path extending portion starts from the point at an angle of 180 degrees to 270 degrees from a reference angle.

11 . The air conditioner of claim 6 , wherein the scroll housing further includes an inner discharge guide portion spaced apart from the flow path extending portion, and
wherein the discharge hole is formed between the flow path extending portion and the inner discharge guide portion.

12 . The air conditioner of claim 6 , wherein the air duct is disposed vertically long at the front of the first centrifugal fan.

13 . The air conditioner of claim 6 , wherein the air duct is positioned next to the flow path extending portion of the first centrifugal fan.

14 . The air conditioner of claim 13 , wherein a start end of the flow path extending portion of the first centrifugal fan is positioned at a point at a predetermined angle of 260 degrees to 280 degrees from the reference angle.

15 . The air conditioner of claim 6 , wherein the section of the air duct has a semicircular shape.

16 . The air conditioner of claim 6 , wherein the lower end of the air duct is positioned on the upper end of the flow path extending portion of the second centrifugal fan.

17 . The air conditioner of claim 6 , wherein the air duct is formed to protrude in an upper direction from the scroll housing of the second centrifugal fan.

18 . The air conditioner of claim 6 , wherein the scroll housing of the first centrifugal fan includes an air guide surface opposite to the air duct.

19 . The air conditioner of claim 6 , wherein a recessed guide portion opposite to the air duct is formed in the scroll housing of the first centrifugal fan, and
wherein the recessed guide portion has an open upper end.

20 . The air conditioner of claim 6 , wherein the impeller of the first centrifugal fan and the impeller of the second centrifugal fan are rotated in the opposite directions to each other.

Assignees

• Lg Electronics Inc

Inventors

• Son Minsu
• Seo Kiwon

Classifications

• F04D25/10

  the unit having provisions for automatically changing direction of output air · CPC title

• F24F1/0033

  having two or more fans · CPC title

• F04D29/4246

  comprising more than one outlet · CPC title

• F24F1/005

  mounted on the floor; standing on the floor · CPC title

• F24F1/0011

  characterised by air outlets · CPC title