This application is based upon and claims the benefit of priority from the prior China Patent Application No. 201220148011.0, filed on Apr. 10, 2012, the entire contents of which are incorporated herein by reference.
(a) Field of the Invention The present invention relates to heat sink technology and more particularly to a heat sink radiation fin and base block mounting structure, which comprises a base block with grooves at one side thereof, and radiation fins with folded portions and hook portions alternatively arranged at two opposite sides near the bottom edge thereof and affixed to the grooves of the base block by means of casting or squeezing technique.
(b) Description of the Prior Art
Conventional heat sinks generally comprise a bottom block and a plurality of radiation fins. Some heat sinks have one or a number of heat pipes fitted into the bottom block thereof. With respect to joining between a bottom block and radiation fins, welding technology is normally employed. U.S. Pat. No. 5,014,776 discloses a method to joining radiation fins to a bottom block by inserting radiation fins in respective channels at the bottom block and then employing a stamping technique to affix the radiation fins to the bottom block.
According to U.S. Pat. No. 5,014,776, a number of parallel channels with an undercut profile and separated by intermediary ridges are provided at the main body (bottom block) of the heating or cooling body (heat sink) for the attachment of the ribs (radiation fins). The ribs (radiation fins) are inserted from the side into the channels by matching foot profiles and are pressed into place through deformation of the intermediary ridges. However, this design does not allow direct insertion of the ribs (radiation fins) into the channels in vertical direction, thus complicating the installation procedure and causing inconvenience.
Further, U.S. Pat. No. 6,758,262 discloses a heat sink. According to this design, thin-sheet fins are inserted in the grooves of the base plate and crimped from both sides by the inclined side faces formed by the plastic deformation of the concave portion at each of two opposite sides of each groove. This design simply provides a two-point clamping force to secure each thin-sheet fin. This clamping effect is not strong enough to secure the thin-sheet fins firmly. The thin-sheet fins may be not kept in flush after installation, or may be forced to vibrate or to fall from the base plate accidentally by an external force. Some other techniques are known to bend the bottom side of each radiation fin into a folded portion or angled portion before insertion into one respective groove at a base block, and then to affix inserted radiation fins to the base block by means of plastic deformation. However, the radiation fins may be tilted sideways when crimped.
The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a heat sink radiation fin and base block mounting structure, which keeps the radiation fins fixedly secured to the base block in a flush manner, avoiding vibration or falling.
To achieve this and other objects of the present invention, a heat sink radiation fin and base block mounting structure comprises a base block providing a plurality of grooves at one side thereof, and a plurality of radiation fins respectively mounted in the grooves of the base block. Each radiation fin has the bottom edge thereof stamped to provide a plurality of folded portions. The folded portions of each radiation fin are equally spaced along the bottom edge of the respective radiation fin and alternatively projecting in two opposite directions. Further, the folded portions of the radiation fins are inserted into the grooves of the base block, and then embedded in or clamped to the base block.
Each radiation fin further comprises a plurality of hook portions respectively disposed between each two adjacent folded portions of the respective radiation fin. The hook portions are embedded with the respective folded portions in the base block or clamped with the respective folded portions to the base block, enhancing the connection stability between the base block and the radiation fins.
As illustrated in
As stated above, the folded portions 21 of each radiation fin 2 are equally spaced along the bottom edge of the radiation fin and alternatively projecting in two opposite directions. According to the embodiment shown in
Referring to
The radiation fins 2 are respectively stamped to provide a plurality of openings 221 at the same elevation. After formation of the openings 221, the hook portions 22 are simultaneously formed. Further, the hook portions 22 are obliquely upwardly extended from the respective bottom edges of the respective openings 221 in two opposite directions. When integrally embedded in or clamped to the grooves 11 of the base block 1, the hook portions 22 enhance the connection stability between the radiation fins 2 and the base block 1.
When employing casting technique, liquid aluminum is preferably selected for casting with the use of a mating mold. After the radiation fins 2 are respectively inserted into the grooves 11 of the base block 1 as shown in
When employing squeezing technique, a punch of a stamping press is driven to stamp the base block 1 against the inserted part of each radiation fin 2, causing deformation of the two opposite sidewalls of each groove 11, and therefore the folded portions 21 and hook portions 22 of the radiation fins 2 are clamped to the base block 1 firmly (see
Referring to
Further, the heat pipes 33 can be straight pipes kept apart from one another in a parallel manner in the bottom wall of the base block 1 (see
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Number | Date | Country | Kind |
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201220148011.0 | Apr 2012 | CN | national |