Air conditioner including a centrifugal fan

Patent metadata

Field	Value
Publication number	US-2022205650-A1
Application number	US-202117561219-A
Country	US
Kind code	A1
Filing date	Dec 23, 2021
Priority date	Dec 25, 2020
Publication date	Jun 30, 2022
Grant date	—

Abstract

The centrifugal fan includes a base plate connected to a rotating shaft of a motor, a plurality of blades joined to a surface of the base plate, and a ring-shaped shroud joined to the plurality of blades to face the base plate. The blade is provided in such a way that a length of one end joint portion joined to the base plate is greater than a length of another end joint portion joined to the shroud, and with respect to a plane perpendicular to a rotation axis, an angle between a first straight line, which connects a leading edge position and a trailing edge position of the one end joint portion, and a straight line passing through a center point of the first straight line and a rotation center is less than an angle between a second straight line, which connects a leading edge position and a trailing edge position of the other end joint portion, and a straight line passing through a center point of the second straight line and the rotation center.

First claim

What is claimed is:

1 . An air conditioner comprising:
a housing mountable to or suspendable from a ceiling and having an air intake port and an air discharge port formed on a portion of the housing; a heat exchanger arranged inside the housing; and a centrifugal fan arranged inside the housing to suck air into the housing through the air intake port and discharge air to an outside of the housing through the air discharge port, wherein the centrifugal fan comprises:
a base plate to which a shaft of a motor is connected;
a plurality of blades joined to the base plate; and
a ring-shaped shroud including an opening in a center thereof, the ring-shaped shroud joined to the plurality of blades so that the ring-shaped shroud and the base plate are spaced apart by the plurality of blades to face each other,
wherein each of the plurality of blades comprises a leading edge and a trailing edge with respect to a rotation direction of the centrifugal fan, wherein the leading edge comprises a rear protruding region formed to retreat and advance toward the rotation direction of the centrifugal fan from a rotation center side toward an outer circumferential side, with respect to a plane perpendicular to a rotation axis of the shaft.

2 . The air conditioner of claim 1 , wherein
the each of the plurality of blades comprises one end joint portion joined to the base plate, and another end joint portion joined to the ring-shaped shroud, wherein an outer circumferential side end of the other end joint portion is located in the rotation direction of the centrifugal fan.

3 . The air conditioner of claim 1 , wherein
the blade comprises one end joint portion joined to the base plate, and another other end joint portion joined to the ring-shaped shroud, wherein an outer circumferential side end of the other end joint portion is located in a direction opposite to the rotation direction of the centrifugal fan.

4 . The air conditioner of claim 1 , wherein
each of the plurality of blades includes multiple rear protruding regions.

5 . The air conditioner of claim 1 , wherein
the leading edge comprises a region continuous from the rear protruding region toward the outer circumferential side, the region formed to retract toward the outer circumferential side.

6 . The air conditioner of claim 1 , wherein with respect a meridian plane passing through the rotation axis, the leading edge comprises:
a first region in which an angle formed with the rotation axis is constant from the rotation center side toward the outer circumferential side; a second region continuous from the first region to the outer circumferential side, the second region in which an angle formed with the rotation axis is reduced and then increased; and a third region continuous from the second region to the outer circumferential side, the third region in which an angle formed with the rotation axis is greater than 90 degrees.

7 . The air conditioner of claim 6 , wherein
an angle between the leading edge and the rotation axis is an angle formed between a tangent line at one point of the leading edge and the rotation axis, the angle facing a suction side of the centrifugal fan.

8 . The air conditioner of claim 6 , wherein
an angle between the leading edge and the rotation axis in the first region is greater than or equal to 5 degrees, but less than or equal to 30 degrees.

9 . The air conditioner of claim 6 , further comprising:
a bell mouth provided inside the ring-shaped shroud acid comprising an inner diameter being gradually expanded toward an upstream side, wherein a downstream end of the bell mouth is located at a position opposite to the third region.

10 . The air conditioner of claim 1 , wherein
with respect to a meridian plane passing through the rotation axis, the leading edge comprises: a first region in which an angle formed with the rotation axis is constant or increased from the rotation center side toward the outer circumferential side; and a second region continuous from the first region to the outer circumferential side, the second region in which an angle formed with the rotation axis is greater than 90 degrees before being joined to the ring-shaped shroud.

11 . The air conditioner of claim 10 , further comprising:
a bell mouth provided inside the ring-shaped shroud and comprising an inner diameter being gradually expanded toward an upstream side, wherein a downstream end of the bell mouth is located at a position opposite to the second region.

12 . The air conditioner of claim 1 , wherein
the trailing edge is formed to be inclined to allow a shroud side of the trailing edge to face a direction opposite to the rotation direction of the centrifugal fan.

13 . The air conditioner of claim 12 , wherein
the trailing edge comprises a region in which an angle between the trailing edge and the rotation axis is reduced toward the shroud side of the trailing edge.

14 . The air conditioner of claim 1 , further comprising:
a bell mouth provided inside the ring-shaped shroud and comprising an inner diameter being gradually expanded toward an upstream side, wherein the bell mouth comprises a ring-shaped member provided on an outer circumference of the bell mouth so as to be adjacent to an inlet portion of the ring-shaped shroud.

15 . The air conditioner of claim 1 , wherein
the blade comprises one end joint portion joined to the base plate, and the other end joint portion joined to the ring-shaped shroud, wherein a length of the one end joint portion is greater than a length of the other end joint portion, and with respect to the plane perpendicular to the rotation axis, an angle between a first straight line, which connects a leading edge position and a trailing edge position of the one end joint portion, and a straight line passing through a center point of the first straight line and the rotation center is less than an angle between a second straight line, which connects a leading edge position and a trailing edge position of the other end joint portion, and a straight line passing through a center point of the second straight line and the rotation center.

16 . An air conditioner comprising:
a housing mountable to or suspendable from a ceiling and comprising an air intake port and an air discharge port formed on a portion of the housing; a heat exchanger arranged inside the housing; a centrifugal fan arranged inside the housing to suck air into the housing through the air intake port and discharge air to an outside of the housing through the air discharge port; and a bell mouth provided inside the ring-shaped shroud and comprising an inner diameter being gradually expanded toward an upstream side, wherein the centrifugal fan comprises:
a base plate to which a shaft of a motor is connected;
a plurality of blades joined to the base plate; and
a ring-shaped shroud including an opening in a center thereof, the ring-shaped shroud joined to the plurality of blades so that the ring-shaped shroud and the base plate are spaced apart by the plurality of blades to face each other,
wherein each of the plurality of blades comprises a leading edge and a trailing edge with respect to a rotation direction of the centrifugal fan, and the trailing edge is formed to be inclined to allow a shroud side of the trailing edge to face a direction opposite to a rotation direction.

17 . The air conditioner of claim 16 , wherein
the trailing edge comprises a region in which an angle between the trailing edge and the rotation axis is reduced toward the shroud

Assignees

• Samsung Electronics Co Ltd

Inventors

• Sato Seiji
• Goto Shinji
• Inoue Nozomu

Classifications

• F04D29/30

  Vanes · CPC title

• F04D29/282

  the leading edge of each vane being substantially parallel to the rotation axis · CPC title

• F05D2240/303

  related to the leading edge of a rotor blade · CPC title

• F24F1/0047

  mounted in the ceiling or at the ceiling · CPC title

• F24F1/0022 Primary

  Centrifugal or radial fans · CPC title