Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Reexamination Certificate
2000-03-20
2001-11-27
Cuda Rosenbaum, I (Department: 3726)
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
C029S890030
Reexamination Certificate
active
06321452
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to methods of manufacturing a heat pipe integrated into the heat sink, and more particularly, to a method of manufacturing a heat pipe integrated into the heat sink produced by compression casting for avoiding the separation of the heat pipe and improving the efficiency of heat dissipation.
2. Description of the Prior Art
A CPU on the motherboard is the most important component in a computer. When the CPU is operated, a lot of heat is generated and must be quickly carried away, otherwise, the CPU will be out of order due to overheating. The conventional heat dissipating devices are commonly composed of a heat sink having a radiator fan mounted on the CPU. The heat is transmitted from the heat sink to the radiator fan and the air passing produces a cool airflow, whereby the heat is quickly and effectively dissipated due to forced convection by a fan.
The heat sink mounted on the CPU is composed of metal with high conductivity but the dissipating efficiency is limited, and is especially insufficient for notebooks. Therefore, a heat pipe is filled with heat conductive liquid and is mounted on the heat sink to carry away the heat more quickly and effectively.
The conventional heat sink with pipes, as shown in FIG.
5
and
FIG. 6
, has a groove (a
1
) for accommodating heat pipe (b) on the heat sink (a). The heat pipe (b) is curved to the same arc of the groove (a
1
) and then fitted onto the groove (a
1
) with heat conductive adhesive (c). The heat pipe (b) has been filled with heat conductive liquid in advance.
Yet the heat conductive adhesive (c) for fixing the heat pipe (b) into the groove (a
1
) of the heat sink (a) forms a layer of another substance between heat pipe (b) and the heat sink (a) so that the heat-radiating rate is decreased and the efficiency of heat dissipation is also reduced.
Once the heat conductive adhesive (c) absorbs heat, it easily hardens and causes the separation of the heat pipe (b). The heat pipe (b) cannot be in contact with the heat sink (a) very closely and the heat-radiating rate is lower. By the way, due to the use of heat conductive adhesive (c), difficulties in assembling the heat sink and cost of the production are increased.
Furthermore, only half of the circumference of the section of the heat pipe (b) is connected to the heat sink (a) thus the contact area between the heat pipe (b) and the heat sink (a) is only half of the total surface area of the heat pipe (b). Since the contact area for heat-dissipating is decreased, the efficiency of heat dissipation is also reduced.
In addition, when the heat pipe (b) is shaped and bent with the same curve of the groove (a
1
) of the heat sink (a), the tolerance is difficult to avoid when being assembled. Thus, the heat pipe (b) cannot contact the groove (a
1
) of heat sink (a) very closely. This further increases the difficulty of assembling the heat sink. Also, the bending point of the heat pipe (b) has a stress concentrated phenomenon and tends to break when the heat conductive liquid inside the heat pipe (b) absorbs heat and expands. The leakage of the heat conductive liquid will also reduce the efficiency of heat dissipation.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to solve the problems of the separation of the heat pipe and improve the efficiency of heat dissipation by providing a heat sink with heat pipe which is formed integrally therein. It is another object of this invention to provide a heat pipe formed integrally inside the heat sink for easily assembling and cost down.
According to the above object, the present invention is a method of manufacturing the heat pipe by integration of the heat pipe into the heat sink. A pipe-shaped groove is mounted into the mold of the heat sink. The heat pipe is shaped into the same form of the groove and mounted into the groove. Next, the heat sink is formed by compression casting and the heat pipe is integrated into the heat sink. The heat pipe has at least one open end exposed to the lateral side of the heat sink. Heat conductive liquid is filled into the heat pipe through the open end which is sealed by tin afterwards. According to the foregoing method, the heat pipe is formed integrally in the heat sink so that the separation of the heat pipe can be avoided and the efficiency of heat dissipation is also improved. The production of the heat sink is more convenient and the cost is also reduced.
The present invention can be best understood through the following description and accompanying drawings, wherein:
REFERENCES:
patent: 4285285 (1981-08-01), Hayashi et al.
patent: 5960866 (1999-10-01), Kimura et al.
patent: 5983995 (1999-11-01), Shutou et al.
patent: 6189213 (2001-02-01), Kimura et al.
Cuda Rosenbaum I
Jacobson & Holman PLLC
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