JP2008251568A - Heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink which can alter the amount of heat dissipation easily without requiring remanufacture of a die. <P>SOLUTION: The heat sink 10 comprises a heat dissipation base 11 in which guide grooves 16 are formed, and coupling fins 13 of unit structure having protrusions 14 being contained in the guide grooves 16 at one edge and guide grooves 15 of similar shape as the guide grooves 16 at the other edge. The amount of heat dissipation of the heat sink can be altered easily without altering the die by altering the number of coupling stages of the coupling fins 13 and changing the length of heat dissipation fins 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat sink, and more particularly to a heat sink formed by coupling a heat dissipation base and a heat dissipation fin.

  The heat sink is used, for example, to promote heat dissipation from a heat generating portion of a device to be cooled such as a communication device or an electric facility. FIG. 6 shows a typical example of a conventional heat sink structure. The heat sink 30 is composed of, for example, a metal heat radiating base 31 and heat radiating fins 32, and the heat radiating base 31 is fixed to, for example, a heat generating portion of the device. In the heat sink 30, the heat radiating base 31 and the heat radiating fins 32 are integrally formed by a manufacturing method such as extrusion molding. In addition, although the heat radiation fin 32 may be formed by processing a metal material together with the heat radiation base 31 by cutting or the like, the manufacturing cost increases because the shape is complicated.

  In the conventional heat sink, whenever the specification of the device to be cooled is changed, the shape and dimensions of the heat sink are designed by thermal calculation or thermal simulation. However, even with recent designs with increased computing capabilities, the numerical values obtained by thermal calculation and the numerical values obtained by actual machine verification often differ due to various factors. Especially for heat sinks manufactured by extrusion, it is necessary to remanufacturing the mold if it is found by actual machine verification that the heat dissipation capacity is insufficient after the mold used is completed. A problem occurs.

Patent Documents 1 and 2 describe heat sinks with adjustable heat dissipation capabilities. In the heat sink of Patent Document 1, a large number of parallel grooves are formed in the heat dissipation base, and the heat dissipation fins are fixed to the heat dissipation base by the spring force acting on the protrusions accommodated in the grooves. In the heat sink of this patent document, the heat dissipation capability can be easily changed by changing the shape, number, and size of the heat sink fixed to the heat dissipation base.
Japanese Utility Model Publication No. 4-61888 (FIG. 1) Japanese Patent Laid-Open No. 4-8552 (FIG. 1)

  In the heat sink described in Patent Document 1, the heat radiation capacity can be adjusted by changing the quantity, shape, and size of the heat sink that is detachably fixed to the heat radiation base. However, the adjustment range has a certain limit. is there. In particular, there is a limit to the number of radiating fins, so if it is necessary to change the shape or size, it will be necessary to change the mold associated with remanufacturing or manufacture a new heat sink by cutting, etc. There is a limit. Moreover, since the structure which fixes a groove | channel and protrusion by spring force is employ | adopted, there also exists a problem that the heat conductivity transmitted to a radiation fin from a thermal radiation base is low.

  In the heat sink described in Patent Document 2, the shape of the guide groove and the shape of the protrusion are formed so as to match each other, so that the thermal conductivity is somewhat improved. However, due to the clearance between the guide groove and the protrusion, there is a limit in improving the thermal conductivity. Moreover, it is the same as that of Patent Document 1 in that there is a limit to the adjustment of the heat dissipation capability.

  In view of the problems of the conventional heat sink described above, the present invention can change the die associated with remanufacturing or cutting even if a design change occurs in the amount of heat to be cooled or the heat dissipation capability is insufficient in the actual machine verification. It is an object of the present invention to provide a heat sink that can be formed with a short TAT without an increase in cost because it is easy to change the heat dissipation capability without requiring a new heat sink.

To achieve the above object, the present invention provides a heat sink comprising a heat dissipation base and a heat dissipation fin connected to the heat dissipation base.
The heat dissipation base is formed with a groove having a predetermined cross-sectional shape and extending in a predetermined direction,
At least a part of the heat dissipating fins is composed of a plurality of strip-shaped fin units, and each of the fin units has a cross-sectional shape that matches the cross-sectional shape of the groove at one edge and extends in the predetermined direction. A protrusion is formed, and a groove extending in the predetermined direction having the same cross-sectional shape as the groove of the heat dissipation base is formed on the other edge facing the one edge.
Two adjacent fin units are connected by a groove of one fin unit and a protrusion of the other fin unit, thereby providing a heat sink.

  In the heat sink of the present invention, a configuration in which a plurality of grooves extend so as to be parallel to each other can be adopted for the heat dissipation base.

  In addition, each of the plurality of radiating fins includes a single fin unit or a fin unit connected to a plurality of stages, and the number of fin units in each radiating fin is individually You may employ | adopt the structure set.

  Furthermore, the fin unit includes at least one first fin unit and at least one second fin unit, and the second fin unit is between the one edge and the other edge. The distance may be different from that of the first fin unit.

  Furthermore, a configuration in which the groove of the heat sink or fin unit and the protrusion of the fin unit are coupled to each other by a press-fitting method may be adopted.

  According to the heat sink of the present invention, the radiating fin is composed of a plurality of fin units having a coupling structure, so that the distance from the surface of the radiating base to the outer edge of the radiating fin, that is, the fin length of the radiating fin can be easily achieved. It can be changed. For this reason, it is possible to change the heat radiation capacity from the heat radiation fins without changing the mold of the heat sink or manufacturing a new heat sink using cutting, and the heat radiation amount of the heat sink can be changed. Therefore, there is an effect that it is possible to shorten the delivery time from the design change of the calorific value of the equipment to be cooled to the manufacture of the heat sink without increasing the manufacturing cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a heat sink according to the first embodiment of the present invention. As shown in the figure, the heat sink 10 includes a heat radiation base 11 and flat heat radiation fins 12 mounted in a plurality of rows on the surface of the heat radiation base 11. The radiating fins 12 in each row are composed of fin units (connecting fins) 13 having the same shape and stacked in a plurality of stages (two stages in the drawing). The connection fins 13 at each stage have a band plate shape, the lower connection fins 13 are locked on the heat dissipation base 11, and the upper connection fins 13 are locked on the lower connection fins 13.

  2A and 2B are respectively a perspective view showing a part of the heat sink 10 developed and a sectional view of the connecting fin. As shown in FIG. 2A, elongated guide grooves 16 are formed in parallel on the upper surface of the heat dissipating base 11 over a plurality of rows. Each guide groove 16 is open to the side surface of the heat dissipation base 11. An elongated protrusion 14 having a cross-sectional shape that conforms to the cross-sectional shape of the guide groove 16 formed in the heat dissipation base 11 is formed on the lower edge surface of the coupling fin 13, and heat dissipation is performed on the upper edge surface. A guide groove 15 having the same shape as the guide groove 16 formed in the base 11 is formed. The details are shown in FIG.

  The lower connection fin 13 is formed by aligning one end of the projection of the connection fin 13 in the longitudinal direction with one end of the guide groove 16 of the heat dissipation base 11 and press-fitting the projection 14 into the guide groove 16. The connecting fins 13 are attached to the heat dissipation base 11. Further, the upper connection fin 13 has one end in the longitudinal direction of the projection 14 on the lower edge surface thereof aligned with one end in the longitudinal direction of the guide groove 15 on the upper edge surface of the lower connection fin 13, so that the lower connection The upper connection fin 13 is attached to the lower connection fin 13 by press-fitting the protrusion 14 of the upper connection fin 13 into the guide groove 15 of the fin 13. Further, the connecting fins 13 can be sequentially attached to the upper stage. Thus, the height of the radiation fin 12 from the mounting surface of the radiation base 11, that is, the fin length can be easily changed by arbitrarily setting the number of stages of the connecting fins 13.

  FIG. 3 shows the details of the coupling structure of the connecting fin 13 and the heat dissipation base 11. As shown in FIG. 2A, each guide groove 16 formed on the surface of the heat dissipation base 11 has a cross-sectional shape in which the width of the internal space of the guide groove 16 is larger than the width of the opening of the guide groove 16. . The protrusion 14 on the lower edge surface of the coupling fin 13 has a constriction suitable for the internal space of the guide groove 16 and the width shape of the opening. In addition, the guide groove 15 on the upper edge surface of the coupling fin 13 has the same shape as the guide groove 16 of the heat dissipation base 11. As shown in FIG. 4B, when the heat sink 10 is assembled, the protrusion 14 on the lower edge surface of the coupling fin 13 is replaced with the guide groove 16 on the heat dissipation base 11 or the guide groove on the upper edge surface of the lower coupling fin 13. 15, longitudinal pressure is applied to the end of the connecting fin 13, and the protrusion 14 is press-fitted into the guide grooves 15 and 16. By using the press-fitting method, the clearance between the guide groove 16 and the protrusion 14 is almost eliminated, so that the thermal conductivity from the heat radiation base 11 to the heat radiation fin 12 is improved. Further, by arbitrarily setting the number of connecting stages of the connecting fins 13, the fin length can be set so as to obtain a heat radiation amount suitable for the heat generation amount of the device to be cooled. In other words, the enveloping volume of the radiating fin 12 can be increased by increasing the number of fins connected to the high heat generation device and increasing the fin length.

  In the heat sink 10 of the present embodiment, the heat dissipation base 11 and the connection fins 13 are manufactured as standard shapes, and the heat generation amount of the device to be cooled is determined, and after the heat calculation of the heat sink is completed, the connection fins 13 to be used. By determining the number of rows and the number of stages, a desired heat radiation amount can be easily obtained. In addition, even when a design change occurs, the amount of heat radiation suitable for the amount of heat generation can be easily selected by increasing or decreasing the number of stages. Furthermore, even if there is a discrepancy in the amount of heat release between the thermal design and the actual machine, the amount of heat release can be easily changed by changing the number of stages. For example, it is easy to cope with specification changes such as a lack of heat radiation heat capacity in an actual machine or an increase in the amount of heat generated by equipment due to a sudden change in parts. In this case, it is not necessary to remanufacture the mold even if the specification is changed.

  FIG. 4 is a perspective view of a heat sink according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view of the heat sink. The heat sink 20 of the present embodiment is different from the heat sink 10 of the first embodiment in that the fin length of some of the radiating fins 22 is different from the fin length of the other radiating fins 12. Other configurations are the same as those of the first embodiment.

  4 and 5, in the heat sink 20 of the present embodiment, a wide connecting fin 23 is attached to the central portion of the heat radiating base 11 at the upper stage, and the heat radiating fin 22 in the central portion has a large heat radiation amount. . In the present embodiment, the central portion of the heat dissipation base 11 is adjacent to a device that generates a particularly large amount of heat among the devices to be cooled. For this reason, a large heat dissipation amount is required per area of the heat dissipation base 11. is there. In other words, this is an example in which heat dissipation measures are taken for local heat generation portions. In this way, heat radiation fins 22 having a long fin length are used in places where a large envelope volume is required, and fine heat dissipation characteristics can be obtained by employing heat radiation fins 12 having normal fin lengths in other places. It is done.

  In addition, in 2nd Embodiment, it replaces with the structure which employ | adopts the wide connection fin 23 for some radiating fins 22, and employ | adopts the connection fin 13 of the same width, but locally of the connection fin 13 of that. It is also possible to adopt a configuration in which the number of stages is increased. In this case, only one type of connecting fin 13 is required. Moreover, the structure which changes the width | variety of a connection fin locally and the structure which changes the step number of a connection fin locally can also be used together. When a heat sink having such a configuration is employed, finer heat dissipation characteristics can be obtained.

  As described above, the heat sink of the present invention can be easily determined by determining the number of rows and stages of connecting fins to be used after the heat generation amount of the device to be cooled is determined and the heat calculation of the heat sink is completed. A desired heat radiation amount can be obtained. In addition, even when a design change occurs, the amount of heat radiation suitable for the amount of heat generation can be easily selected by increasing or decreasing the number of stages. Furthermore, even if there is a discrepancy in the amount of heat release between the thermal design and the actual machine, the amount of heat release can be easily changed by changing the number of stages. Further, it is possible to easily cope with the amount of heat generated locally.

  Although the present invention has been described based on the preferred embodiment, the heat sink of the present invention is not limited to the configuration of the above embodiment, and various modifications and changes are made to the configuration of the above embodiment. What has been done is also included in the scope of the present invention.

1 is a perspective view of a heat sink according to a first embodiment of the present invention. (A) is a perspective view which expands the heat sink of FIG. 1, and shows the one part, (b) is sectional drawing which shows the detail of a connection fin. (A) is sectional drawing which shows the attachment structure of the heat sink of FIG. 1, (b) is a partially broken perspective view of the heat sink which shows the attachment process of a connection fin. The perspective view of the heat sink which concerns on the 2nd Embodiment of this invention. Sectional drawing of the heat sink of FIG. The perspective view of the conventional typical heat sink.

Explanation of symbols

10: Heat sink 11: Radiation base 12: Radiation fin 13: Connection fin (fin unit)
14: Protrusion 15: Guide fin guide groove 16: Radiation base guide groove 20: Heat sink 22: Radiation fin 23: Connection fin 30: Heat sink 31: Radiation base 32: Radiation fin

Claims (5)

In a heat sink comprising a heat dissipation base and a heat dissipation fin connected to the heat dissipation base,
The heat dissipation base is formed with a groove having a predetermined cross-sectional shape and extending in a predetermined direction,
At least a part of the heat dissipating fins is composed of a plurality of strip-shaped fin units, and each of the fin units has a cross-sectional shape that matches the cross-sectional shape of the groove at one edge and extends in the predetermined direction. A protrusion is formed, and a groove extending in the predetermined direction having the same cross-sectional shape as the groove of the heat dissipation base is formed on the other edge facing the one edge.
An adjacent two fin units are coupled to each other by a groove of one fin unit and a protrusion of the other fin unit.   The heat sink according to claim 1, wherein a plurality of grooves extend in the heat dissipation base so as to be parallel to each other.   Each of the plurality of radiating fins includes one fin unit or a fin unit connected to a plurality of tiers, and the number of fin units in each radiating fin is individually set. The heat sink according to claim 2.   The fin unit includes at least one first fin unit and at least one second fin unit, the second fin unit being a distance between the one edge and the other edge. The heat sink according to any one of claims 1 to 3, wherein is different from the first fin unit.   The heat sink as described in any one of Claims 1-3 with which the groove | channel of the said heat sink or fin unit and the protrusion of the said fin unit are mutually couple | bonded by the press-fitting method.

Images