Heat dissipation device with bracket

An exemplary heat dissipation device includes a base plate, a bracket engaged with the base plate, and a heat radiator mounted on the base plate and the bracket. The bracket includes two parallel arms. The bracket defines an opening between the arms. Each of the arms extends downwardly two clasps. Each clasp of each arm comprises a blocking part and a connecting part connecting the blocking part. The base plate is received into the opening of the bracket and sandwiched and secured by the blocking parts of the clasps and the arms of the bracket.

BACKGROUND

1. Technical Field

The present disclosure relates to a heat dissipation device and, more particularly, to a heat dissipation device for cooling an electronic component, such as an integrated circuit package. The heat dissipation device includes a bracket facilitating assembly thereof.

2. Description of Related Art

Many electronic components, such as central processing units (CPUs), comprise numerous circuits operating at high speed and generating substantial heat. Under most circumstances, it is necessary to cool the CPUs in order to maintain safe operating conditions and assure that the CPUs function properly and reliably. In the past, various approaches have been used to cool electronic components. Typically, a heat dissipation device is attached to an outer surface of a CPU to remove the heat therefrom.

A typical heat dissipation device generally comprises a base for absorbing heat from an electronic component mounted on a printed circuit board, a fin assembly soldered on the base, and a bracket engaged with the base for mounting the base onto the printed circuit board. The base absorbs heat from the electronic component and transfers the heat to the fin assembly, whereupon the heat dissipates into the ambient air. The bracket is fixed to the base by screws. It is necessary to use a screwdriver or other tool to manipulate the screws. Therefore it is inconvenient for the heat dissipation device to be assembled.

Accordingly, what is needed is a heat dissipation device which can overcome the above-mentioned problems and shortcomings.

DETAILED DESCRIPTION

Referring toFIGS. 1-2, a heat dissipation device100in accordance with a preferred embodiment of the present disclosure is shown. The heat dissipation device100is for mounting onto a printed circuit board (not shown) to remove heat from a heat-generating electronic component (not shown) attached on the printed circuit board. The electronic component can for example be a CPU (not shown). The heat dissipation device100comprises a heat radiator10, a base plate20, a pair of heat pipes30connecting the base plate20with the heat radiator10, and a bracket40engaging the base plate20with the heat radiator10. The heat dissipation device100further comprises a plurality of fasteners50to mount the bracket40on the printed circuit board.

The base plate20has a rectangular configuration. The base plate20has a bottom surface21(seeFIG. 4) for contacting a top of the heat-generating electronic component. The base plate20comprises a top inserting portion23with a width less than that of a main portion21of the base plate20. The base plate20defines two parallel grooves22at the inserting portion23thereof. Each of the grooves22defines a semicircular section.

The heat radiator10comprises a plurality of fins11. The fins11are stacked together and mounted on the base plate20. The fins11are separated from each other at uniform intervals. The heat radiator10has a wedge-shaped structure, which defines a bottom contact surface13and a lateral locating surface15. The bottom contact surface13engages a top of the inserting portion23of the base plate20. The heat radiator10defines two slots14at the bottom contact surface13, corresponding to the grooves22of the base plate20. The slots14cooperate with the grooves22to define channels62(seeFIG. 5) for receiving the heat pipes30when the fins11of the heat radiator10are stacked together and mounted onto the base plate20. The heat radiator10defines a pair of through holes12at a top portion thereof to receive the heat pipes30. The lateral locating surface15of the heat radiator10is used to mount a fan (not shown) thereon. The lateral locating surface15is inclined with respect to the bottom contact surface13. A first acute angle (not shown) is defined between the lateral locating surface15and the bottom contact surface13. The heat radiator10defines a groove16at the lateral locating surface15near the bottom contact surface13, thereby forming a flange17at an edge of the bottom contact surface13.

The heat pipes30are U-shaped. Each heat pipe30comprises a horizontal evaporating portion31, a condensing portion32parallel to the evaporating portion31, and an adiabatic portion33connecting the evaporating portion31and the condensing portion32.

Referring also toFIG. 3, the bracket40is made of a single piece of metal. The bracket40includes a rectangular frame (not labeled), and four ears42extending in four different directions from four points of the frame. The bracket40defines an opening43in a central portion thereof. The opening43has a shape similar to that of the inserting portion23of the base plate20. The bracket40includes two opposite arms411, and a first wall412and a second wall418interconnecting ends of the arms411, respectively. Thus, one of the arms411, the first wall412, the other arm411and the second wall418arranged end to end cooperatively surround the opening43.

The arms411are positioned horizontally to have planar top surfaces (not labeled). An inner edge of each arm411is punched to define two cutouts413and form two clasps414extending downwardly from the inner edge. The cutouts413of the arms411are communicated with the opening43of the frame. Each of the clasps414is L-shaped, and comprises a connecting part4141extending downwardly from the arm411and a blocking part4142extending from a free end of the connecting part4141. The connecting part4141is perpendicular to the corresponding arm411, and the blocking part4142is perpendicular to the connecting part4141and parallel to the arm411. Therefore, the blocking parts4142are below and spaced from the arms411. The two blocking parts4142of one arm411face the two blocking parts4142of the other arm411.

Each of the first and second walls412,418is plate-shaped and upright, and interconnect corresponding ends of the arms411. The first wall412defines a first undercut4120at a bottom thereof, and the second wall418defines a second undercut4180at a bottom thereof. The first undercut4120and the second undercut4180have rectangular shapes, and are communicated with the opening43. The first undercut4120has a height larger than a thickness of the inserting portion23and a width the same as that of the inserting portion23. In this embodiment, the first undercut4120is wider than the second undercut4180so that the base plate20can extend through the first undercut4120and abut against the bracket40at the second undercut4180. Each of the first and second walls412,418has an inclined baffle415extending from a lateral end thereof, respectively. The baffles415are located at the one same arm411, and are aligned (coplanar) with each other. A second acute angle (not shown) is defined between each of the baffles415and the arm411. Each of the second acute angles corresponds to the first acute angle defined between the lateral locating surface15and the bottom contact surface13. In particular, each of the second acute angles is substantially equal to the first acute angle. A slit416(seeFIG. 5) is defined between a bottom edge of each baffle415and the arm411. The slits416are for receiving the flange17of the heat radiator10.

Referring also toFIGS. 4-5, in assembly of the heat dissipation device100, the base plate20extends through the first undercut4120from an outer side of the bracket40, until the base plate20abuts against the bracket40at the second undercut4180. In other words, the base plate20slides into the bracket40along a transverse direction. The main portion21of the base plate20is sandwiched between the blocking parts4142of the clasps414and the arms411to firmly engage the bracket40. The inserting portion23of the base plate20is received in the opening43of the bracket40and has a top surface parallel to a top surface of the arms411of the frame. The top surface of the base plate20and the bottom contact surface13of the heat radiator10are attached together with solder paste. The heat radiator10is placed on the inserting portion23of the base plate20and pushed along a lengthwise direction toward the baffle415. The flange17of the heat radiator10inserts into the slits416between the baffles415and the corresponding arm411. The heat radiator10is mounted on the arms411of the frame and sandwiched between the first and second walls412,415of the bracket40.

Then the evaporating portions31of the heat pipes30extend through the first undercut4120of the first wall412, the channels62cooperatively defined by the slots14of the heat radiator10and the grooves22of the base plate20, and the second undercut4180of the second wall418. The condensing portions32of the heat pipes30extend through the through holes12of the heat radiator10. Thereby, the heat radiator10is located in transverse directions by the first and second walls412,418, and located in lengthwise directions by the baffles415and the evaporating portions31of the heat pipe30. Finally, the heat dissipation device100is heated at high temperature to solder the base plate20, the heat radiator10, and the heat pipes30together. The heat dissipation device100is thus assembled.

Advantages of the heat dissipation device100include the following. With the provision of the clasps414of the bracket40clamping the base plate20, the heat dissipation device100is assembled conveniently and firmly, thereby reducing manufacturing costs of the heat dissipation device100. In addition, the first and second walls412,418, the baffles415, and the evaporating portions31of the heat pipe30together locate the heat radiator10in transverse directions and in lengthwise directions. Thus a strength of the heat dissipation device100is improved.