Heat-dissipating module

Details Heat-dissipating module Heat-dissipating module

2002-05-09

2003-11-18

Flanigan, Allen (Department: 2835)

Heat exchange

With impeller or conveyor moving exchange material

Mechanical gas pump

C165S080300, C361S697000

Reexamination Certificate

active

06648065

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a heat-dissipating module, particularly to a heat-dissipating module with high heat dissipation efficiency and backup function.
BACKGROUND OF THE INVENTION
As the efficiency of electric devices improves, heat-dissipating devices have become indispensable components of many electric devices. Without appropriate heat dissipation, the electric devices may burn out, or its performance will be reduced. Hence, for heat radiation, a heat-dissipating device is usually disposed on the upper or lateral surface of a device, such as a CPU, generating a lot of heat during the operating process.
FIG.
1
(
a
) shows a conventional cooler
10
, comprised of a fan
50
and a heat sink
60
. The fan
50
is disposed on the upper surface of the heat sink
60
, and the heat sink
60
is attached to a heat source (not shown), such as a CPU. The disadvantages of the conventional cooler
10
designs are (1) unsatisfactory heat dissipating performance and (2) lack of redundant function. The disadvantages are further described below:
In FIG.
1
(
a
), the conventional cooler
10
has only one fan
50
. If the fan
50
is failed in operation, the cooler
10
will fail to provide appropriate heat radiation and the CPU may burn out.
Furthermore, as the operating performances of the electric
30
device increase, the cooler only having a single fan may not be sufficient. Therefore, as shown in FIG.
1
(
b
), a structure that comprises two fan units
50
a
,
50
b
is proposed to increase the heat-dissipating efficiency. According to this design, although the cooler
10
may provide a backup function while one fan unit is failed, both of them will be interfered with each other such that it is hard to obtain the predetermined heat-dissipating effect and the noise will be greatly increased.
FIG.
1
(
c
) shows another solution. A structure having a larger fan
50
c
is proposed to increase the heat-dissipating efficiency. However, this design still has the problem of the lack of backup function.
Hence, an innovative cooler device is required to solve the problems mentioned above.
SUMMARY OF THE INVENTION
To solve the problems mentioned above, the present invention proposes a heat-dissipating module with a better dissipating efficiency and the backup function.
Accordingly, this invention provides a heat-dissipating module. The heat-dissipating module comprises a heat sink and a fan device. The heat sink is provided with a plurality of cooling fins. The fan device, disposed on the heat sink, is provided with a first rotor blade, a second rotor blade, a base, an outer frame, and a plurality of ribs. The base is provided with a first support and a second support. The first support and the second support extend in opposite directions. The first support is coupled to the first rotor blade, and the second support is coupled to the second rotor blade. The first rotor blade and the second rotor blade are surrounded by the outer frame. The ribs extend from the base to the outer frame.
Furthermore, the first rotor blade raises its rotation speed when the second rotor blade is failed, and the second rotor blade raises its rotation speed when the first rotor blade is failed. That is, the first rotor blade and the second rotor blade are electrically coupled. The rotation speed of the first rotor blade is controlled by a first control circuit and a first output terminal. The rotation speed of the second rotor blade is controlled by a second circuit and a second output terminal. The first output terminal is coupled to the second control circuit, and the second output terminal is coupled to the first control circuit. Each of the first and second output terminals is adapted to send out a signal indicating whether the rotation speed of the rotor blade is normal. For example, the signal is “1” if the corresponding rotation speed is normal, and “0” if the rotation speed is abnormal. However, a contrary arrangement of the signal is also possible.
Furthermore, when the first and second rotor blades are running normally, they both operate at lower speed. However, if a malfunction occurs in one of them, the other raises its rotation speed. For example, if the first rotor blade malfunctions, the second control circuit receives the abnormal signal sent from the first output terminal and drives the second rotor blade to speed up, thereby compensating the efficiency loss. To achieve this operation, it is important that the first and second rotor blades are both operate in at least one high-speed mode and one low-speed mode. In other words, the rotor blades need to be dual-speed.
Furthermore, to reduce noise and increase heat-dissipating efficiency, the rotation directions of the first and second rotor blades are opposite such that the two airflows tangent to the rotor blades may counteract and the airflow along the shaft direction is more concentrated. Of course, the rotation directions and speeds of the first and second rotor blade can also be the same.
In another preferred embodiment, the heat-dissipating module comprises a heat sink, a first rotor blade, a second rotor blade and a base. The heat sink is provided with a plurality of cooling fins and a space defined by the cooling fins. The first rotor blade and the second rotor blade are connected in series, and are located in the space.
Furthermore, the heat-dissipating module comprises an outer frame, a plurality of ribs, a first support, and a second support. The first support and the second support extend in opposite directions. The first support is coupled to the first rotor blade, and the second support is coupled to the second rotor blade. The ribs extend from the base to the outer frame.
Furthermore, the first rotor blade raises its rotation speed when the second rotor blade is failed, and the second rotor blade raises its rotation speed when the first rotor blade is failed


REFERENCES:
patent: 5297617 (1994-03-01), Herbert
patent: 5745041 (1998-04-01), Moss
patent: 6219242 (2001-04-01), Martinez
patent: 6343014 (2002-01-01), Lin
patent: 6367542 (2002-04-01), Chen
patent: 6396688 (2002-05-01), Davies et al.
patent: 6526333 (2003-02-01), Henderson et al.

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