JPH0310695Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heat sink used for cooling electrical equipment, etc.

(Prior Art) A configuration in which a base plate and a heat radiation fin are integrally formed by extrusion molding is already known.

Also, a configuration in which corrugated fins or profile fins are brazed to a flat base plate is already known.

(Problems to be solved by the invention) In the above-mentioned conventional structure, which is integrally formed by extrusion molding, the cross-sectional dimension is restricted by the circumscribed circle of the extrusion die, so it is restricted by the dimensions of the base plate, and the height of the fins is It cannot be made very high, and the thickness of the fin cannot be made very thin.
Moreover, the pitch of the fins cannot be made too small. For this reason, the heat radiation area cannot be made sufficiently large, and the heat radiation effect cannot be sufficiently enhanced. Further, this configuration still has problems such as increased weight, increased size, and increased manufacturing costs.

On the other hand, in the conventional configuration using corrugated fins, it is necessary to prepare a special jig to secure the corrugated fins to the base plate during brazing, and the brazing process is time-consuming. ing. Furthermore, when the jig is placed in a furnace for brazing, heat is consumed to heat the jig, resulting in poor thermal efficiency and high heating costs. Furthermore, even in this case, it is difficult to make the pitch of the fins sufficiently small.

The present invention attempts to solve the above problems.

(Means for solving the problem) The present invention consists of a large number of heat dissipation fins stacked at intervals with their lower edges aligned, and all heat dissipated through holes formed in each heat dissipation fin. This heat sink is characterized by comprising at least two pipes inserted through and fixed to the fins and spaced apart from each other, and a base plate to which the lower edges of all the heat dissipation fins are fixed.

(Example) In FIG. 1, a flat base plate 11
It integrally has side plates 12 projecting upward on two parallel sides so that the cross section is U-shaped with an upward opening. In the side plate 12, grooves 13 extending laterally are formed in the middle portion in the vertical direction, and the two grooves 13 are formed in a U-shaped cross section that opens in directions facing each other.

Three heat dissipation fin units 14 are inserted into a space surrounded by the base plate 11 and side plates 12. In each heat dissipation fin unit 14, a large number (for example, 133) of heat dissipation fins 15 are stacked at regular intervals, and the heat dissipation fins 15 have holes formed by burring as shown in FIG. 16 are provided, two each. The heat dissipation fin 15 is a rectangular thin plate-like member that extends vertically and is long laterally, and the hole 16 is formed in the heat dissipation fin 15.
Two of them are provided at a distance in the longitudinal direction. A pipe 17 is inserted into each hole 16, and the heat dissipation fin 15 and the pipe 1 are inserted through the pipe expansion process.
7 is integrally fixed. Both ends of the pipe 17 protrude from the heat dissipation fin 15 disposed at the end of the heat dissipation fin unit 14, and the protruding portions of the pipe 17 are fitted into the grooves 13. In addition,
The vertical width of the groove 13 is set to be slightly larger than the outer diameter of the pipe 17, and due to this vertical play, the lower end of the heat radiation fin 15 comes into contact with the upper end surface of the base plate 11 due to its own weight. The positions of the groove 13 and the pipe 17 and the size of the heat radiation fin 15 are set. This ensures that the lower end of the heat dissipation fin 15 contacts the base plate 11, and prevents the heat dissipation fin 15 from buckling in the brazing process described later.

Here, the base plate 11 is made of an aluminum alloy (for example, 6063 shape material), and the heat dissipation fins 15 are made of, for example, an Al--Mn alloy (3003 material) on both sides of the plate made of an Al--Si alloy having a lower melting point than that of the Al--Mn alloy (3003 material). A brazing sheet made of laminated thin layers of 4343 material) is used. Base plate 1
The upper end surface of the heat dissipating fin 15 and the lower end of the heat dissipating fin 15 are brazed together by melting this low melting point Al--Si alloy layer in a furnace.

Next, the assembly method will be explained. First, a large number of heat radiation fins 15 are placed on the pipe 17 at predetermined intervals.
The heat radiation fins 15 are fixed to the pipe 17 by inserting the heat dissipating fins 15 into the pipe 17 and expanding the pipe 17. At this time, the pitch of the heat radiation fins 15 can be easily changed by variously changing the interval between the heat radiation fins 15, and the heat radiation area based on the heat radiation fins 15 can be changed in various ways. Subsequently, three heat dissipation fin units 14 formed by fixing the heat dissipation fins 15 and the pipes 17 are inserted into the base plate 11. At this time, since the outer diameter of the pipe 17 is set larger than the vertical width of the groove 13, the heat dissipation fin unit 14 can be easily
can be inserted. Also, based on this play, the lower end of the heat radiation fin 15 comes into contact with the upper end surface of the base plate 11 due to its own weight.

Next, the heat dissipating fin unit 14 is placed in the base plate 11 and placed in a furnace to be heated. The heat sink according to the present invention is completed by melting the Al--Si alloy on the surface of the heat dissipating fins 15 and integrally fixing the base plate 11 and the heat dissipating fins 15 by brazing.
At this time, since the radiation fins 15 are in contact with the upper surface of the base plate 11 due to their own weight, no special jig is required. Furthermore, even if the heat dissipation fins 15 become soft due to high temperatures, since the ends of the pipes 17 are held on the lower surface of the grooves 13, there is no fear that the heat dissipation fins 15 will buckle in the furnace.

Note that the completed heat sink is used by placing the base plate 11 on a heat generating element. The heat from the heating element is mainly absorbed by the base plate 1.
1 to the heat dissipating fin 15 via the brazed portion, and is transmitted to the first
Heat is radiated by blowing wind in the direction of arrow F in the figure.

(Effects of the Invention) As described above, the heat sink of the present invention includes a large number of heat dissipation fins 15 stacked at intervals with their lower edges aligned, and holes 16 formed in each heat dissipation fin 15. At least two pipes 17 are inserted through and fixed to all of the heat dissipation fins 15 and are spaced apart from each other, and all of the heat dissipation fins 15 are
Since the base plate 11 is fixed to the lower edge of the base plate 11, the following effects can be expected.

(a) Unlike extrusion molding, there are no strong restrictions on the height, thickness, or pitch of the heat dissipation fins, making it possible to secure a sufficiently large heat dissipation area per weight. This makes it possible to sufficiently enhance the heat dissipation effect.

(b) The present invention does not require a special jig that is required when securing the corrugated fins to the base plate, making it possible to save labor in assembly work. That is, the pipe 17 is connected to all the heat radiation fins 1.
5, all the heat dissipation fins 15 are maintained in a stacked state with their lower edges aligned and spaced from each other, and at least two pipes 17 are inserted and fixed at intervals. As a result, rotation of the heat dissipation fin 15 around the pipe 17 is prevented, and the maintenance state of the heat dissipation fin 15 is ensured.
It will be maintained perpendicular to the base plate 11 just by placing it on top, and therefore no special holding jig is required to maintain the perpendicularity.

(c) Since no special holding jig is required, even when assembled by brazing, thermal efficiency is high when placed in a furnace, and heating costs can be reduced.

(d) Therefore, it becomes possible to reduce the weight, size, and manufacturing cost of the entire heat sink.

(Another embodiment) (a) A situation in which there is no fear of buckling of the radiation fins 15 during heating in a furnace, for example, the thickness of the radiation fins 15 is sufficient, or the number of radiation fins 15 is sufficiently large. In the case of sliding, the groove 13 can be omitted. In addition, if movement of the radiation fin unit 14 in the furnace is not a problem,
Furthermore, the side plate 12 can also be omitted.

(b) When forming the holes 16 in the heat dissipation fins 15,
It is also possible to positively form a cylindrical flange and use that flange to arrange the radiation fins 15 at a constant pitch.

(c) Instead of the groove 13, a stepped portion 20 into which the end of the pipe 17 fits may be formed on the side plate 12, as shown in FIG. Note that the position of the stepped portion 20 needs to be set at a height such that a slight gap is formed between the upper surface of the stepped portion 20 and the lower surface of the pipe 17 when the heat dissipation fin unit 14 is inserted.

In this case, the heat dissipation fin unit 1 is installed from above.
4 can be fitted, making the assembly operation even easier.

(d) If the base plate 11 and the radiation fins 15 are difficult to fit together during brazing, a configuration as shown in FIG. 4 may be adopted.

In FIG. 4, a brazing sheet 21 is provided between the base plate 11 and the heat radiation fins 15.
Sheet-like flat plates 22 are stacked on top of each other, with the lower ends of the heat dissipating fins 15 in contact with the flat plates 22. The flat plate 22 is made of the same aluminum alloy as the heat dissipation fins 15 (3003 material in the above embodiment), thereby improving the familiarity of the brazing material melted from the heat dissipation fins 15.

(e) The number of heat dissipation fin units 14 is not limited to three, and one or more may be used. Further, the number of pipes 17 used for each heat dissipation fin unit 14 is not limited to two, and one or more pipes may be used as appropriate depending on the length of the heat dissipation fin 15.

(f) As shown in FIGS. 5 and 6, integral heat radiation fins 23 for heat radiation may be formed on one or both sides of the side plate 12. The integrated heat dissipation fins 23 can further improve the heat dissipation effect.

In this case, for convenience of processing by extrusion molding, the bottom plate of the base plate 11 and the side plate 12 are made into separate members and are fixed together with a rod-shaped solder 24 or resin hot melt. is preferred. For the hot melt adhesive structure, a string-like resin hot melt adhesive is used. Also, instead of the groove 13 (Fig. 1),
It is also possible to adopt a structure in which the end of the pipe 17 is supported by a protrusion 26 as shown in FIG.

(g) Instead of using a brazing sheet with a laminated structure as the heat dissipation fins 15, a simple aluminum alloy is used, and instead, a sheet of resin adhesive hotmelt is placed on the top surface of the base plate 11, and this hotmelt is used. Alternatively, the lower end of the radiation fin 15 may be fixed to the base plate 11.

In this case, although the thermal conductivity is inferior to brazing, it has the advantage of further reducing manufacturing costs.

(h) Instead of fixing the heat dissipation fins 15 to the base plate 11 by brazing or hot melting, as shown in FIG. The heat dissipation fin 15 can also be fixed by fixing it to the base plate 12 and sandwiching the heat dissipation fin 15 between the base plate 11 and the presser plate 25 from above and below.

(i) Regarding the contact area between the heat dissipation fin 15 and the base plate 11, solder plating is applied to the lower edge of the fin 15 and the surface of the base plate 11 separately, and the base plate 11 and the fin 1 are bonded together using the method described above.
After combining 5, it is also possible to heat and fuse.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a Finch-Ube heat sink according to the present invention, FIG. 2 is a partial cross-sectional view of FIG. 1, and FIGS. 3 to 6 are views corresponding to FIG. FIG. 7 is a vertical cross-sectional perspective partial view of yet another embodiment. 11... Base plate, 15... Heat radiation fin, 16... Hole, 17... Pipe.

Claims (1)

[Scope of utility model registration request] A plurality of heat dissipation fins stacked one on top of the other at intervals with their lower edges aligned, and at least one heat dissipation fin that is inserted and fixed to all the heat dissipation fins through holes formed in each heat dissipation fin and spaced apart from each other. A finch tube heat sink characterized by consisting of two pipes and a base plate to which the lower edges of all heat dissipation fins are fixed.