Cooling system

1. A cooling system, comprising:

a first set of fans mounted on an inward-facing side of an air inlet on an outer shell of a case;

a second set of fans mounted on an inward-facing side of an air outlet on the outer shell of the case, for generating, in cooperation with the first set of fans, an airflow from the air inlet to the air outlet;

a first heat transfer device connected to a heat generating component of a plurality of heat generating components in the case, for absorbing heat from the heat generating component and transferring the absorbed heat to a second heat transfer device; and

the second heat transfer device mounted on an inward-facing side of the second set of fans and cooled by the airflow, wherein the second heat transfer device is a heat sink and comprises a first surface facing the heat generating component and a second surface opposite the first surface and facing the second set of fans.

2. The system of claim 1 , wherein the first heat transfer device comprises a plurality of sets of heat pipes, each set of heat pipes corresponding to one of the plurality of heat generating components and comprising a heat pipe having one end connected to the one heat generating component and another end connected to the second heat transfer device.

3. The system of claim 1 , wherein the heat generating component of the plurality of heat generating components has its surface coated with a layer of thermally conductive silicone grease, and

the first heat transfer device comprises a heat pipe having one end connected to the heat generating component via a first mounting device,

wherein the first mounting device comprises a heat pipe base and a heat pipe cover, the heat pipe base being mounted fixedly on the thermally conductive silicone grease for the heat generating component, and the heat pipe cover having a groove or slot provided on its bottom for mounting the heat pipe, and wherein the one end of the heat pipe is pressed tightly onto the heat pipe base by the heat pipe cover.

4. The system of claim 1 , wherein the first heat transfer device comprises a heat pipe, and the heat pipe comprises a pipe shell, a wick within the pipe shell and a pipe cover for sealing the pipe shell, the pipe shell being filled with a volatile liquid having a low boiling point.

5. The system of claim 2 , wherein the other end of the heat pipe in each set of heat pipes is connected to the second heat transfer device by means of welding.

6. The system of claim 4 , wherein the heat pipe is formed by:

drawing out air from the pipe shell to form a negative pressure inside the pipe shell;

filling the pipe shell and the wick with the volatile liquid having the low boiling point; and

sealing the pipe shell with the pipe cover.

7. The system of claim 6 , wherein the heat pipe has one end connected to the heat generating component and another end connected to the second heat transfer device,

wherein the volatile liquid in the wick is configured to vaporize when the end of the heat pipe connected to the heat generating component absorbs heat from the heat generating component,

wherein the heat pipe is configured so that vaporized volatile liquid flows towards the end of the heat pipe connected to the second heat transfer device and becomes a liquid when meeting the second heat transfer device, or

wherein the volatile liquid is configured to release heat to the second heat transfer device when becoming a liquid, and the wick is configured to have a capillary force so that the liquified volatile liquid flows from the end of the heat pipe connected to the second heat transfer device to the end of the heat pipe connected to the first heat transfer device.

8. The system of claim 1 , wherein the first heat transfer device comprises a heat pipe, the second heat transfer device further comprises a third surface between the first surface and the second surface, and the heat pipe is connected to the second heat transfer device at the third surface.

9. The system of claim 4 , wherein the wick is made of porous material.

10. A method for making a cooling system, comprising:

providing a first set of fans mounted on an inward-facing side of an air inlet on an outer shell of a case;

providing a second set of fans mounted on an inward-facing side of an air outlet on the outer shell of the case, for generating, in cooperation with the first set of fans, an airflow from the air inlet to the air outlet;

providing a first heat transfer device connected to a heat generating component of a plurality of heat generating components in the case, for absorbing heat from the heat generating component and transferring the absorbed heat to a second heat transfer device; and

providing the second heat transfer device mounted on an inward-facing side of the second set of fans and cooled by the airflow, wherein the second heat transfer device is a heat sink and comprises a first surface facing the heat generating component and a second surface opposite the first surface and facing the second set of fans.

11. The method of claim 10 , wherein the first heat transfer device comprises a plurality of sets of heat pipes, each set of heat pipes corresponding to one of the plurality of heat generating components and comprising a heat pipe having one end connected to the one heat generating component and another end connected to the second heat transfer device, the heat pipe comprising a pipe shell, a wick within the pipe shell, and a pipe cover for sealing the pipe shell, the pipe shell being filled with a volatile liquid having a low boiling point, the method further comprising:

drawing out air from the pipe shell to form a negative pressure inside the pipe shell;

filling the pipe shell and the wick with the volatile liquid having the low boiling point; and

sealing the pipe shell with the pipe cover.

12. The method of claim 11 , wherein the volatile liquid in the wick is configured to vaporize when the end of the heat pipe connected to the one heat generating component absorbs heat from the one heat generating component,

wherein the heat pipe is configured so that vaporized volatile liquid flows towards the end of the heat pipe connected to the second heat transfer device and becomes a liquid when meeting the second heat transfer device, or

wherein the volatile liquid is configured to release heat to the second heat transfer device when becoming a liquid, and the wick is configured to have a capillary force so that the liquified volatile liquid flows from the end of the heat pipe connected to the second heat transfer device to the end of the heat pipe connected to the first heat transfer device.

13. The method of claim 10 , wherein the first heat transfer device comprises a heat pipe, the second heat transfer device further comprises a third surface between the first surface and the second surface, and the heat pipe is connected to the second heat transfer device at the third surface.

14. The method of claim 11 , wherein the wick is made of porous material.