Centrifugal fan

Patent metadata

Field	Value
Publication number	US-12188483-B2
Application number	US-202318117013-A
Country	US
Kind code	B2
Filing date	Mar 3, 2023
Priority date	Aug 1, 2022
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

The disclosure provides a centrifugal fan including a housing and a blade module. The housing includes a lower cover, a side wall, and an upper cover. Two ends of the side wall are respectively connected to the lower cover and the upper cover to define an internal space. The lower cover includes a plurality of lower air inlets. The blade module is arranged in the internal space, and includes a hub and a plurality of blades. The hub is rotatably arranged on the lower cover. The blades are arranged around the hub. The lower air inlets are located on the periphery of the hub, and each lower air inlet includes an outer edge relative to a rotational axis of the hub. At least one of two ends of at least one of the lower air inlets includes a protruding portion at a position corresponding to the outer edge.

First claim

What is claimed is:

1. A centrifugal fan, comprising:
a housing, comprising a lower cover, a side wall, and an upper cover, wherein two ends of the side wall are respectively connected to the lower cover and the upper cover, the lower cover, the side wall, and the upper cover define an internal space, and the lower cover comprises a plurality of lower air inlets; and
a blade module, arranged in the internal space, and comprising:
a hub, rotatably arranged on the lower cover; and
a plurality of blades, arranged around a periphery of the hub, wherein
the lower air inlets are located on the periphery of the hub, and each lower air inlet comprises an outer edge relative to a rotational axis of the hub; and
at least one of two ends of at least one of the lower air inlets comprises a protruding portion at a position corresponding to the outer edge;

wherein the outer edge define a first circle, the protruding portion define a second circle on an outer side of the first circle, the first circle has a first radius, the second circle has a second radius, and a difference between the first radius and the second radius is greater than 5% of the first radius;
wherein tips of the blades define a third circle, the third circle has a third radius, and the second radius is less than the third radius;
wherein the protruding portion has a first width, a rib between two neighboring lower air inlets has a second width, and the first width is greater than half of the second width, but is less than two times the second width;
wherein two of the protruding portions are located beside the rib.

2. The centrifugal fan according to claim 1 , wherein the upper cover comprises an upper air inlet.

3. The centrifugal fan according to claim 1 , wherein the side wall comprises two air outlets, and air outlet directions of the two air outlets are perpendicular to each other.

4. The centrifugal fan according to claim 1 , wherein the protruding portion has a first width, a rib between neighboring two of the plurality of lower air inlets has a second width, and the first width is greater than half of the second width, but is less than two times the second width.

5. The centrifugal fan according to claim 1 , wherein the side wall comprises an air outlet, the air outlet comprises a front side and a rear side with respect to a rotation direction of the hub, the front side, the rear side, and the rotational axis define a low-pressure region, and the protruding portion is located in the low-pressure region.

6. The centrifugal fan according to claim 5 , wherein the front side and the rotational axis form a first boundary, the rear side and the rotational axis form a second boundary, the second boundary rotates with the rotational axis as a center by a preset angle in an opposite direction of the rotation direction to form a third boundary, and the first boundary and the third boundary form the low-pressure region.

7. The centrifugal fan according to claim 6 , wherein the preset angle ranges from 20 to 60 degrees.

8. The centrifugal fan according to claim 1 , wherein the side wall comprises a first air outlet and a second air outlet, an air outlet direction of the first air outlet is perpendicular to that of the second air outlet, the first air outlet comprises a first front side and a first rear side with respect to a rotation direction of the hub, the second air outlet comprises a second front side and a second rear side with respect to the rotation direction of the hub, the first front side, the second rear side, and the rotational axis define a low-pressure region, and the protruding portion is located in the low-pressure region.

9. The centrifugal fan according to claim 8 , wherein the first front side and the rotational axis form a first boundary, the second rear side and the rotational axis form a second boundary, the second boundary rotates with the rotational axis as a center by a preset angle in an opposite direction of the rotation direction to form a third boundary, and the first boundary and the third boundary form the low-pressure region.

10. The centrifugal fan according to claim 9 , wherein the preset angle ranges from 20 to 60 degrees.

11. A centrifugal fan, comprising:
a housing, comprising a lower cover, a side wall, and an upper cover, wherein two ends of the side wall are respectively connected to the lower cover and the upper cover, the lower cover, the side wall, and the upper cover define an internal space, and the lower cover comprises a plurality of lower air inlets; and
a blade module, arranged in the internal space, and comprising:
a hub, rotatably arranged on the lower cover; and
a plurality of blades, arranged around a periphery of the hub, wherein
the lower air inlets are located on the periphery of the hub, and each lower air inlet comprises an outer edge relative to a rotational axis of the hub; and
at least one of two ends of at least one of the lower air inlets comprises a protruding portion at a position corresponding to the outer edge;

wherein the outer edge define a first circle, the protruding portion define a second circle on an outer side of the first circle, the first circle has a first radius, the second circle has a second radius, and a difference between the first radius and the second radius is greater than 5% of the first radius;
wherein tips of the blades define a third circle, the third circle has a third radius, and the second radius is less than the third radius;
wherein the side wall comprises an air outlet, the air outlet comprises a front side and a rear side with respect to a rotation direction of the hub, the front side, the rear side, and the rotational axis define a low-pressure region, and the protruding portion is located in the low-pressure region;
wherein the front side and the rotational axis form a first boundary, the rear side and the rotational axis form a second boundary, the second boundary rotates with the rotational axis as a center by a preset angle in an opposite direction of the rotation direction to form a third boundary, and the first boundary and the third boundary form the low-pressure region;
wherein the preset angle ranges from 20 to 60 degrees;
wherein at least a part of the protruding portion is located in a part of the low-pressure region between the second boundary and the third boundary.

Assignees

• Asustek Comp Inc

Inventors

• Lin Hsin Chen
• Chiou Ing-Jer

Classifications

• F04D17/16

  for displacing without appreciable compression · CPC title

• F04D29/281

  for fans or blowers · CPC title

• F04D29/4213

  suction ports · CPC title

• F04D29/4226 Primary

  Fan casings · CPC title