Heat dissipation device

A heat dissipation device is provided and includes a vapor chamber unit, a heat pipe set provided on an outer surface of the vapor chamber unit, a first fin set provided on the outer surface of the vapor chamber unit and sleeving the heat pipe set, and a second fin set stacked on the first fin set and sleeving the heat pipe set, where the fin arrangement direction of the first fin set is different from the fin arrangement direction of the second fin set.

BACKGROUND

1. Technical Field

The present disclosure relates to the heat dissipation field, and more specifically, to a heat dissipation device with a vapor chamber and fin sets.

2. Description of Related Art

In the face of modernization, computers and various other electronic devices have seen rapid developments and continuously improved performance. However, along with these improvements, heat dissipation has become one of the major issues faced by high performance hardware today. In general, computers and electronic devices employ heat dissipation components for dissipating the heat away. For example, a thermal paste or cooling fins can be attached onto an electronic component that is subjected to heat dissipation in order to absorb and disperse heat generated by the electronic component. However, heat dissipation effect provided by this type of heat dissipation method is rather limited. Heat dissipation components that use phase changes of working fluids for heat transfer have thus been developed.

The heat dissipation components achieve heat transfer typically by utilizing the phase changes and directions of flow of working fluids. However, when faced with the high heat generated by high power processors, heat cannot be dissipated effectively, resulting in poor heat dissipation efficiency.

Therefore, there is an urgent need in the art to provide a heat dissipation device that addresses the aforementioned shortcomings of the prior art.

SUMMARY

The present disclosure provides a heat dissipation device, which includes: a vapor chamber unit; a heat pipe set provided on an outer surface of the vapor chamber unit; a first fin set provided on the outer surface of the vapor chamber unit and sleeving the heat pipe set; and a second fin set stacked on the first fin set and sleeving the heat pipe set, wherein an arrangement direction of fins of the first fin set is different from an arrangement direction of fins of the second fin set.

In the aforementioned heat dissipation device, the heat pipe set includes a plurality of first heat pipes and a plurality of second heat pipes, wherein the plurality of first heat pipes are provided on the outer surface on two opposite ends of the vapor chamber unit, and the plurality of second heat pipes are provided on the outer surface between the two opposite ends of the vapor chamber unit.

In the aforementioned heat dissipation device, the first fin set includes a plurality of holes penetrating through two sides of the first fin set to sleeve the plurality of first heat pipes and the plurality of second heat pipes, wherein a cross-sectional area of each of the holes is greater than a cross-sectional area of a pipe body of each of the plurality of first heat pipes or each of the plurality of second heat pipes.

In the aforementioned heat dissipation device, heights of the plurality of first heat pipes extending from the outer surface are greater than heights of the plurality of second heat pipes extending from the outer surface.

In the aforementioned heat dissipation device, the first fin set partially covers and partially exposes the plurality of first heat pipes and the plurality of second heat pipes.

In the aforementioned heat dissipation device, the second fin set further includes a second primary fin set and a second secondary fin set stacked on the second primary fin set, wherein the second primary fin set completely covers portions of the plurality of second heat pipes exposed from the first fin set, and partially covers and partially exposes portions of the plurality of first heat pipes, and wherein the second secondary fin set partially or completely covers the portions of the plurality of first heat pipes exposed from the second primary fin set.

In the aforementioned heat dissipation device, each of the plurality of first heat pipes or the plurality of second heat pipes includes a pipe body and a closed end and an open end at two opposite ends of the pipe body, wherein at least one connector is provided on the outer surface of the vapor chamber unit for connecting with the open end.

The aforementioned heat dissipation device further includes a chamber formed inside the vapor chamber unit, and an internal pipe space formed inside the pipe body, wherein the internal pipe space is in communication with the chamber through the open end and the connector.

The aforementioned heat dissipation device further includes a capillary structure located in the internal pipe space and extends into the chamber via an inner side of the connector.

In the aforementioned heat dissipation device, the capillary structure includes a first segment and a second segment, wherein the first segment is located in the internal pipe space, and the second segment is formed by bending and extending one end of the first segment and is located in the chamber.

The aforementioned heat dissipation device further includes a working fluid filled in the chamber and the internal pipe space, wherein the working fluid is guided by the capillary structure to flow in the capillary structure.

In the aforementioned heat dissipation device, the open end extends axially along and radially outwards from the pipe body, such that an aperture of the open end is greater than an aperture of the connector, wherein a conical space is formed between the open end, the connector and the outer surface once the open end is connected to the connector and contacting the outer surface of the vapor chamber unit.

The aforementioned heat dissipation device further includes a solder joint filled in the conical space to seal a junction between the open end and the connector.

In the aforementioned heat dissipation device, the vapor chamber unit and the heat pipe set are integrally formed.

In the aforementioned heat dissipation device, a thickness of the first fin set extending from the outer surface of the vapor chamber unit is greater or less than a thickness of the second fin set stacked on the first fin set.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present disclosure are illustrated with specific implementations. Other advantages and technical effects of the present disclosure can be readily understood by one with ordinary skills in the art upon reading the disclosure provided herein, and can be used or applied in other different implementations.

Referring toFIGS.1,2and3, a heat dissipation device1in accordance with the present disclosure includes a vapor chamber unit10, a heat pipe set11, a first fin set21and a second fin set22. The heat pipe set11is provided on an outer surface1011of the vapor chamber unit10. The first fin set21is provided on the outer surface1011of the vapor chamber unit10and sleeved the heat pipe set11and partially exposing the heat pipe set11. The second fin set22is stacked on the first fin set21and sleeved the heat pipe set11exposed by the first fin set21and partially exposing the heat pipe set11. In an embodiment, the overall form factors of the first fin set21and the second fin set22can approximate the outer surface1011of the vapor chamber unit10, such that the outer surface1011of the vapor chamber unit10can be completely covered. However, the present disclosure is not limited to as such. In addition, a fin set described herein refers to a structure that is composed of a plurality of fins arranged at intervals. The technical content of the fin sets and the associations with the heat pipe set is described as follows.

In an embodiment, the outer surface1011of the vapor chamber unit10is defined with two side regions A at two opposite ends of the outer surface1011and a middle region B between the two opposite ends. The heat pipe set11can include a plurality of first heat pipes111and a plurality of second heat pipes112, wherein the plurality of first heat pipes111are arranged on the two side regions A, and the plurality of second heat pipes112are arranged on the middle region B. The plurality of first heat pipes111and the plurality of second heat pipes112are arranged at intervals to one another. In an embodiment, the number of the first heat pipes111provided on each of the side regions A is five, whereas the number of the second heat pipes112provided on the middle region B is seven, but the present disclosure is not limited as such and the quantities can be adjusted depending on the needs. Furthermore, the arrangements and the locations of the first heat pipes111and the second heat pipes112can be designed by taking the uniformity of temperature distribution into consideration. As such, the present disclosure is not limited to the arrangements and the locations illustrated inFIGS.1to3.

In an embodiment, the first heat pipes111and the second heat pipes112respectively extend from the outer surface1011in a direction that is away from the outer surface1011(e.g., perpendicular to the outer surface1011), and the directions of extensions of the first heat pipes111and the second heat pipes112are parallel to each other, but the present disclosure is not limited to as such. In another embodiment, the extension height of the first heat pipes111from the outer surface1011is higher than the extension height of the second heat pipes112from the outer surface1011, but the present disclosure is not limited to as such. In addition, the first heat pipes111and the second heat pipes112can be heat dissipation components in the form of heat pipes with cross-sectional shapes of circles, ovals or polygons, but the present disclosure is not limited to as such.

In an embodiment, the first fin set21includes a plurality of holes211penetrating through two sides of the first fin set21to sleeve the first heat pipes111and the second heat pipes112. The overall height of the first fin set21is lower than the heights of the first heat pipes111and the second heat pipes112, such that the first fin set21can only cover the portions of the first heat pipes111and the second heat pipes112that are in proximity to the vapor chamber unit10and partially expose the portions of the first heat pipes111and the second heat pipes112that are far away from the vapor chamber unit10. In an embodiment, the direction in which the fins of the first fin set21are arranged is perpendicular to the direction in which the first heat pipes111and the second heat pipes112are extended from the outer surface1011. In other words, the fins of the first fin set21are perpendicularly disposed on the outer surface1011of the vapor chamber unit10, such that the holes211are formed by the gaps among the arrangements of the fins, and the cross-sectional shapes of the holes211are generally square. However, the present disclosure is not limited as such.

In an embodiment, the cross-sectional areas of the holes211of the first fin set21are greater than the cross-sectional areas of the pipe bodies of the first heat pipes111(e.g., pipe bodies1111of the first heat pipes111) and the second heat pipes112, such that the pipe bodies of the first heat pipes111and the second heat pipes112in the holes211are free from being contacted with the first fin set21, but the present disclosure is not limited as such.

In an embodiment, the second fin set22includes a second primary fin set221and a second secondary fin set222. The second primary fin set221is stacked on the first fin set21, and the second secondary fin set222is stacked on the second primary fin set221. The second primary fin set221includes a plurality of holes2211penetrating through the two sides of the second primary fin set221to sleeve the first heat pipes111and the second heat pipes112. The overall height of the second primary fin set221and the first fin set21is the same as the heights of the second heat pipes112, such that the second primary fin set221can completely cover the portions of the second heat pipes112that are exposed from the first fin set21, so that the second heat pipes112are free from being protruded from the top surface of the second primary fin set221. However, since the first heat pipes111are higher than the second heat pipes112, so the second primary fin set221can only partially cover portions of the first heat pipes111that are exposed from the first fin set21and still expose the remaining portions of the first heat pipes111.

The second secondary fin set222also includes a plurality of holes2221penetrating through the two sides of the second secondary fin set222. Since the portions of the second heat pipes112exposed from the first fin set21have already been completely covered by the second primary fin set221, so there is no need to provide holes in the second secondary fin set222at locations corresponding to the second heat pipes112, only holes2221at locations corresponding to the first heat pipes111are needed. After the second secondary fin set222is stacked on the second primary fin set221, the second secondary fin set222can partially cover the portions of the first heat pipes111that are exposed from the second primary fin set221. In an embodiment, the second secondary fin set222can completely cover the portions of the first heat pipes111that are exposed from the second primary fin set221, such that the first heat pipes111are free from being protruded from the top surface of the second secondary fin set222. Alternatively, the second secondary fin set222can partially cover the portions of the first heat pipes111that are exposed from the second primary fin set221, such that the first heat pipes111protrude out of the top surface of the second secondary fin set222. However, the present disclosure is not limited to as such.

In an embodiment, the fins of the second primary fin set221and the second secondary fin set222are arranged in the same direction parallel to the direction in which the first heat pipes111and the second heat pipes112extend from the outer surface1011. In other words, the fins of the second fin set22are provided horizontally on the outer surface1011of the vapor chamber unit10, so the holes2211and2221are formed by penetrating through each of the fins in the second primary fin set221and the second secondary fin set222. The cross-sectional shapes of the holes2211and2221are generally circular or in conformity to the cross-sectional shapes of the first and second heat pipes111and112, but the present disclosure is not limited as such.

As can be seen from the above, the arrangement direction of the fins of the first fin set21is different from the arrangement direction of the fins of the second fin set22. However, the present disclosure does not require the directions in which the fins of the first and second fin sets21and22are arranged to be at a right angle to each other, and can be adjusted to other angles depending on the needs as long as the fins of the first and second fin sets21and22are arranged in different directions to each other.

In an embodiment, the thickness of the first fin set21extending from the outer surface1011of the vapor chamber unit10is greater or less than the thickness of the second fin set22stacked on the first fin set21. The ratio of the thickness of the first fin set21extending from the outer surface1011of the vapor chamber unit10to the thickness of the second fin set22stacked on the first fin set21is 7:3 or 3:7, but the present disclosure is not limited as such.

Referring toFIGS.3and4,FIG.4is a schematic partial cross-sectional view illustrating a junction between a first heat pipe111and the vapor chamber unit10shown inFIG.3. The following descriptions are set forth using a single first heat pipe111for illustrative purposes, the rest of the first heat pipes111and the plurality of the second heat pipes112have the same structures and will not be further illustrated.

As shown inFIG.3, the first heat pipe111includes a pipe body1111and an open end1112and a closed end1113at two opposite ends of the pipe body1111. As shown inFIG.4, at least one connector1012is provided on the outer surface1011of the vapor chamber unit10for connecting with the open end1112. The vapor chamber unit10can include a top board101and a bottom board102. When the top board101and the bottom board102are assembled together, a chamber103can be formed therein. An outer surface1011of the top board101is provided with the connector1012. The connector1012includes an opening1013that is in communication with the chamber103. The amount of connectors1012can correspond to the amount of the first heat pipes111and the second heat pipes112. An internal pipe space1114is formed in the pipe body1111, and the open end1112of the pipe body1111can be connected with the connector1012, such that the internal pipe space1114is in communication with the chamber103via the open end1112and the opening1013of the connector1012.

In an embodiment, the open end1112extends axially along as well as radially outwards from the pipe body1111, so the open end1112resembles the shape of a trumpet, and the aperture D1of the open end1112can be greater than the aperture D2of the connector1012. Such a structure allows a conical space30to be formed between the open end1112, the connector1012and the outer surface1011after the open end1112is connected to the connector1012and contacting the outer surface1011of the vapor chamber unit10. In addition, the inner diameter of the pipe body1111is equivalent to the aperture D2of the connector1012, and the length of the connector1012protruding from the outer surface1011is greater than the length of the open end1112, such that after the open end1112is connected to the connector1012, the end of the connector1012can be wedged into the pipe body1111, thereby securing the first heat pipes111and the second pipes112on the outer surface1011of the vapor chamber unit10.

In an embodiment, in order to enhance the stability of the first and second heat pipes111and112on the outer surface1011and the effectiveness of the seal between the chamber103and internal pipe space1114, a solder joint S can be filled in the conical space30, as well as around the outer periphery of the open end1112and on the outer surface1011of the vapor chamber unit10to seal the junction between the open end1112and the connector1012. In the embodiment above, a soldering material is used to join the first heat pipes111, the second heat pipes112and the vapor chamber unit10; however, in other embodiments, the vapor chamber unit10, the first heat pipes111and the second heat pipes112can be integrally formed, and the present disclosure is not limited as such.

In an embodiment, a capillary structure104can be further provided in the first heat pipes111, the second heat pipes112and the vapor chamber unit10. The capillary structure104can be located in the internal pipe space1114of the pipe body1111and extends into the chamber103through the opening1013inside the connector1012. The capillary structure104includes a first segment1041and a second segment1042. The first segment1041is firmly or not firmly attached onto the inner surface1115of the pipe body1111, and one end of the first segment1041extends into the chamber103through the opening1013inside the connector1012. Once the end of the first segment1041extends into the chamber103and contacts the inner surface1021of the bottom board102, the end of the first segment1041bends and extends to form the second segment1042. The second segment1042is firmly attached to the inner surface1021of the bottom board102in the chamber103. In an embodiment, the first segment1041and the second segment1042of the capillary structure104are perpendicular to each other, but the present disclosure is not limited to as such.

In an embodiment, a plurality of fluid channels105can be formed on the inner surface1021of the bottom board102, and the second segment1042of the capillary structure104is firmly attached on the plurality of fluid channels105. The plurality of fluid channels105can be regarded as capillary layers for filling a working fluid. For example, the fluid channels105can be formed from sintered bodies, metal mesh bodies, grooves, or a combination of the above, wherein sintered bodies refer to structures with multiple pores or interconnected holes formed by sintering metal powder; metal mesh bodies refer to woven meshes having multiple meshes formed by metal weaving; grooves refer to a plurality of interconnected grooves formed from gaps between a plurality of columns that are etched into the inner surface1021of the bottom board102by wet etching the inner surface1021of the bottom board102. The capillary structures104are structures formed on the fluid channels105, for example, the capillary structures104can be elongated structures made of fibers or the aforementioned metal mesh bodies. However, the present disclosure is not limited to as such.

In an embodiment, a working fluid can be filled in the chamber103of the vapor chamber unit10and the inner pipe space1114of the first and second heat pipes111and112. The working fluid can be guided by the capillary structure104or the fluid channels105to flow therein. For example, the working fluid in the chamber103can be distributed evenly in the chamber103by the second segments1042of the capillary structures104, or can be concentrated above a heat source by the second segments1042. When the heat dissipation device1of the present disclosure is in contact with a heat source, the liquid working fluid absorbs the heat energy generated by the heat source and becomes vaporized. The now gaseous working fluid can flow into the inner pipe space1114of the first and second heat pipes111and112via the openings1013of the connectors1012. The gaseous working fluid is then cooled by the first fin set21and the second fin set22and condensed into liquid again, which can flow back into the chamber103through the first segments1041of the capillary structures104in the internal pipe space1114and is gathered or distributed evenly by the second segments1042of the capillary structures104for the next cooling circle.

In conclusion, with the special arrangements of the first fin set21and the second fin set22in the heat dissipation device1of the present disclosure, the distribution of the airflow field can be disrupted to increase the turbulence of the airflow field. This allows the chances of the airflow in contact with the cooling fins to be increased, thereby improving heat dissipation efficiency, and thus can be advantageous when applied to high power processors.

The above embodiments are provided for illustrating the principles and technical effects of the present disclosure, and should not be construed as to limit the present disclosure in any way. The above embodiments can be modified by one of ordinary skill in the art without departing from the spirit and scope of the present disclosure. Therefore, the scope claimed of the present disclosure should be defined by the following claims.