HEAT DISSIPATION APPARATUS

• US 20080011461A1
• Filed: 07/14/2006
• Published: 01/17/2008
• Est. Priority Date: 07/14/2006
• Status: Active Grant

• Current Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd.
• Inventors: Hwang, Ching-Bai, Meng, Jin-Gong, Lin, Ran
• Granted Patent: US 7,802,617 B2
• Time in Patent Office: Days
• US Class Current: 165/122
• CPC Class Codes: F04D 29/422 Discharge tongues F04D17/04 takes precedence
• CPC Class Codes: G06F 1/20 Cooling means

Abstract

A heat dissipation apparatus (10) includes a centrifugal blower (12) and a fin assembly (11) having a plurality of fins (111) disposed at an air outlet (129) of the centrifugal blower. The centrifugal blower includes a first tongue (130) distant from the fin assembly, and a second tongue (131) located between the first tongue and the air outlet of the blower. The second tongue has an end (132) substantially parallel to the fins of the fin assembly to guide an airflow smoothly flowing through the fins.

Claims

1. A heat dissipation apparatus comprising:

a centrifugal blower; and

a fin assembly comprising a plurality of fins which are disposed at an air outlet of the centrifugal blower, the fins being stacked along a first direction to form the fin assembly, each of the fins extending along a second direction perpendicular to the first direction;

wherein the centrifugal blower comprises a first tongue distant from the fin assembly, and a second tongue located between the first tongue and the air outlet of the blower, the second tongue having an end which is located between two lateral edges of the fin assembly and oriented in a direction substantially parallel to the second direction.

2. The heat dissipation apparatus as described in claim 1, wherein the first direction is perpendicular to a rotation axis of a rotor of the blower.

3. The heat dissipation apparatus as described in claim 1, wherein the end of the second tongue is distant from the first tongue.

4. The heat dissipation apparatus as described in claim 1, wherein the second tongue has a bulge adjacent to the air outlet, the bulge being closest to free ends of blades of the centrifugal blower than any other portion of the second tongue.

5. The heat dissipation apparatus as described in claim 1, wherein a distance between a surface of the second tongue near blades of the centrifugal blower and free ends of the blades gradually increases from the air outlet towards the first tongue.

6. The heat dissipation apparatus as described in claim 1, wherein the first tongue has a surface adjacent to blades of the centrifugal blower, a distance between the adjacent surface and free ends of the blades gradually increases along a rotation direction of the blades of the blower.

7. The heat dissipation apparatus as described in claim 1, wherein the blower comprises a base plate and a sidewall surrounding the base plate, the first tongue extends from the sidewall towards an inner side of the blower, whilst the second tongue is disposed on the base plate.

8. The heat dissipation apparatus as described in claim 7, wherein the second tongue spaces a distance from the sidewall to form a sub-channel therebetween, an end of the second tongue spaces a distance from the first tongue to form an entrance, allowing an airflow to enter into the sub-channel.

9. The heat dissipation apparatus as described in claim 8, wherein a width of the sub-channel gradually increases from an end apart from the air outlet towards an opposite end adjacent to the air outlet.

10. A heat dissipation apparatus comprising:

a blower; and

a fin assembly disposed at an air outlet of the blower and comprising a plurality of fins;

wherein the blower comprises at least two tongues, at least one of the at least two tongues is disposed adjacent to the fin assembly, the at least one tongue dividing the blower into two chambers wherein an airflow generated by the blower flows from the two chambers through the fin assembly.

11. The heat dissipation apparatus as described in claim 10, wherein the at least two tongues comprises a first tongue distant from the fin assembly, and a second tongue comprising an end substantially parallel to an extending direction of adjacent fins of the fin assembly and located between the first tongue and the air outlet of the blower and between two sides of the fin assembly.

12. The heat dissipation apparatus as described in claim 11, wherein the two chambers have a main chamber and a sub-channel with a size smaller than the main chamber.

13. The heat dissipation apparatus as described in claim 12, wherein a width of the sub-channel gradually increases from an end apart from the air outlet towards an opposite end adjacent to the air outlet.

14. The heat dissipation apparatus as described in claim 12, wherein an entrance for the airflow entering the sub-channel is defined between the first tongue and the second tongue.

15. The heat dissipation apparatus as described in claim 14, wherein the first tongue forms an arcuate surface facing the entrance for guiding the airflow to smoothly enter the sub-channel.

16. The heat dissipation apparatus as described in claim 11, wherein the second tongue has a bulge adjacent to the air outlet, the bulge is closest to free ends of blades of the blower than any other portion of the second tongue.

17. The heat dissipation apparatus as described in claim 16, wherein a distance between a surface of the second tongue near the free ends of the blades and the free ends of the blades gradually increases from the bulge towards the first tongue.

18. The heat dissipation apparatus as described in claim 11, wherein the first tongue has a surface adjacent to blades of the blower, a distance between the adjacent surface and free ends of the blades gradually increases along a rotation direction of the blades of the blower.

19. A heat dissipation device comprising:

a blower comprising an inlet, an outlet, a rotor rotatably mounted in the blower, when the rotor rotates, an airflow being generated to flow from the inlet through the outlet, and a tongue; and

a fin assembly mounted at the outlet of the blower;

wherein

the tongue has an end near the fin assembly, located between first and second sides of the fin assembly and oriented parallel to an extending direction of each of the fins, the airflow has a part flowing through the fin assembly from a portion of the fin assembly between the first side and the tongue and another part flowing through the fin assembly from another portion of the fin assembly between the tongue and the second side of the fin assembly.

20. The heat dissipation device as described in claim 19, wherein the blower further comprises an additional tongue, the tongue is located between the fin assembly and the additional tongue, the additional tongue has an arcuated surface for guiding the another part of the airflow to flow smoothly through the fin assembly from the another portion of the fin assembly between the tongue and the second side of the fin assembly.