JP2015175542A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device capable of corresponding to a variety of arrangements of high heat generating electronic components.SOLUTION: A cooling device 1 is configured by: a container 2 configured by an outer edge 2a and a bottom surface 4; and a cover unit 3 configured by a plurality of fins 7 having a step 7a, a cover 8 in which a slit 9 for penetrating the plurality of fins 7 is provided in parallel with a long side on one end side of the long side, a plate 10 in which a slit 11 is provided for further penetrating the plurality of fins 7 which have penetrated the cover 8 and a spacer 12 (spacer A12a, spacer B12b) which is provided on the whole periphery in the plate 10 and which holds an interval between the cover 8 and the plate 10. In the container 2, the bottom surface 4 comprises an opening surface 5 and a heat receiving surface 6. A plurality of protrusions 6a are provided at a screwing position corresponding to the arrangement of high heat generating components 20, which are cooling objects, at the heat receiving surface 6. The spacer A12a has a U-shape, and a plurality of grooves 13 in which a refrigerant passes are provided in the spacer B12b.

Description

  The present invention relates to a cooling device used for cooling, for example, a mobile base station equipped with a high heat generating electronic component.

  For example, a thermosiphon type cooler is known as a cooling device used for cooling a mobile base station or the like on which high heat-generating electronic components are mounted (for example, see Patent Document 1).

  This cooling device has a structure in which the condensing unit and the evaporation unit are directly connected to each other, and a predetermined opening is formed in the evaporation unit formed by joining the extrusion mold material constituting the plurality of passages into one plate shape by friction stir welding (FSW). And a T-shaped condensing part with a perforated brazing sheet or brazing clad sheet and brazed directly to reduce the joining part and make the structure relatively simple This is a simple configuration.

JP 2002-134670 A

  In such a conventional cooling device, since it has a configuration using an extrusion mold material in the evaporation part, in the case where it is used for an application in which a plurality of high heat generation electronic components are individually screwed to the evaporation part In addition, a female screw protrusion is required at the screwing position, which has a problem that it cannot cope with various arrangements of high heat-generating electronic components.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a cooling device that can cope with various arrangements of highly heat-generating electronic components.

  In order to achieve this object, the cooling device of the present invention has a rectangular shape in which a plurality of fins having steps and slits corresponding to the number of the plurality of fins are provided on one end side of the long side in parallel with the long side. Corresponding to the arrangement of a cover unit having a flat cover, a plate provided with slits for the number of the plurality of fins, a spacer provided between the cover and the plate, and a heat generating component to be cooled on the bottom surface A cooling device that cools the heating element by phase conversion circulation of a refrigerant filled in a sealed space that is provided with a container having an opening on the opposite surface of the bottom surface, the cover and the spacer, A heat radiating space is formed by the plate, and the cover unit includes a slit in the cover and a slit in the plate until the step contacts the cover. And the plurality of fins are formed by brazing in a state where the plurality of fins are present in the heat dissipation space, and the plurality of fins protruding toward the plate are inserted into the opening of the container, and the bottom surface of the container The container and the cover unit are arranged so as to form a heat receiving space with the cover, and a joint between the cover and the container is friction stir joined, and the heat radiating space and the heat receiving space are sealed and the heat radiating space and the heat receiving space are sealed. It communicates the space and achieves the intended purpose.

  As described above, the cooling device of the present invention includes a plurality of fins having steps, a rectangular flat plate cover provided with slits corresponding to the number of the plurality of fins on one end side of the long side in parallel with the long side, A cover unit having a plate provided with slits for the number of fins, a spacer provided between the cover and the plate, and a plurality of protrusions corresponding to the arrangement of the heat generating components to be cooled are provided on the bottom surface. And a cooling device that cools the heating element by phase conversion circulation of the refrigerant filled in a sealed space formed by a container having an opening on the opposite surface of the bottom surface, wherein the heat dissipation space is formed by the cover, the spacer, and the plate. The cover unit is configured to insert the plurality of fins into the slit of the cover and the slit of the plate until the step comes into contact with the cover. Formed by brazing with the plurality of fins present therein, inserting the plurality of fins protruding toward the plate into the opening of the container, and forming a heat receiving space with the bottom surface of the container and the cover Since the container and the cover unit are arranged so that the joint between the cover and the container is friction stir joined, the heat radiation space and the heat receiving space are sealed, and the heat radiation space and the heat receiving space are communicated with each other. The plurality of protrusions can be freely arranged on the bottom surface of the container to cope with various arrangements of the high heat generation electronic components.

  Further, since the fins are passed through the cover and the plate and are present in the heat radiation space, the contact efficiency with the refrigerant vaporized in the heat receiving space can be improved, and the cooling efficiency of the high heat-generating component can be improved.

  In addition, the spacer provided between the cover and the plate enables friction stir welding regardless of the material of the cover, the plate, and the container.

  Furthermore, by providing a plurality of grooves in the spacer arranged at the boundary between the heat receiving space and the heat radiating space, the strength for friction stir welding is maintained, and the circulation of the refrigerant from the heat receiving space to the heat radiating space and from the heat radiating space to the heat receiving space is maintained. Without obstructing, it becomes possible to cool the heat generating component stably.

The perspective view of the cooling device of Embodiment 1 of this invention Exploded perspective view of the cooling device Exploded perspective view of the cover unit The block diagram which shows the cross section (cut cross section by the plane A of FIG. 2) of the cover unit The block diagram which shows the cross section by plane B of FIG. (A) The front view seen from the cover side which shows the junction part of the cooling device, (b) The rear view which shows the junction part of the cooling device The block diagram which shows the cut cross section by the plane A of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 7 show an embodiment of a cooling device. As shown in FIG. 1, the cooling device 1 includes a container 2 and a cover unit 3.

  As shown in FIG. 2, the container 2 includes an outer edge 2a and a bottom surface 4. The bottom surface 4 includes an opening surface 5 and a heat receiving surface 6. The heat receiving surface 6 is an arrangement of the high heat generating component 20 as a heating element to be cooled. A plurality of protrusions 6a are provided at screwing positions corresponding to the above. The cover unit 3 includes a plurality of fins 7, a cover 8, a plate 10, and a spacer 12.

  As shown in FIG. 3, the cover unit 3 includes a plurality of fins 7 having steps 7 a, a cover 8 provided with slits 9 penetrating the plurality of fins 7 on one end side of the long side in parallel with the long side, 8 comprises a plate 10 provided with slits 11 for further penetrating a plurality of fins 7 passing through 8, and spacers 12 (spacer A12a, spacer B12b) provided on the entire circumference of the plate and maintaining the distance between the cover 8 and the plate 10. Has been.

  The spacer A12a has a U-shape, and the spacer B12b is provided with a plurality of grooves 13 through which the refrigerant passes.

  Next, the detailed configuration of the fin 7 will be described. As shown in FIG. 3, the plurality of fins 7 are notched on both sides of the long side to form a step 7 a. The fin 7b on the outermost side of the plurality of fins 7 is smaller than the other fins, the slit 9a of the cover 8 corresponding to the fin 7b is also short, and the cover 8 is not provided with the shortened slit 9a. A pipe hole 8a for attaching the pipe 15 used for filling is provided.

  The slits 11a of the plate 10 corresponding to the fins 7b are also short like the slits 9a.

  Further, as shown in FIG. 4 which is a sectional view of the cover unit 3 of FIG. 2 taken along the plane A, a heat radiation space 14 is formed by the cover 8, the spacer 12, and the plate 10, and the heat radiation space 14 has a plurality of fins. 7 penetrates.

  The cover unit 3 is assembled from FIG. 3 to FIG. 2 with the plurality of fins 7 being slit 9 (including 9a) of the cover 8 until the step 7a contacts the cover 8, and the slit 11 (including 11a) of the plate 10. It is inserted and formed by brazing in a state where a plurality of fins 7 are present in the heat radiation space 14.

  Then, as shown in FIG. 2, a plurality of fins 7 protruding to the plate 10 side of the cover unit 3 assembled by brazing are inserted into the opening surface 5 of the container 2, and the bottom surface 4 of the container 2 and a part of the outer edge 2a The container 2 and the cover unit 3 are arranged so as to form the heat receiving space 16 with the cover 8, and the joints of the cover 8, the container 2, and the container 2 and the plate 10 are friction stir joined, and the heat radiating space 14 and the heat receiving space 16 are sealed. .

  Thereafter, the heat radiation space 14 and the heat receiving space 16 are evacuated by the pipe 15 attached to the cover 8, and an appropriate amount of refrigerant is filled to complete the cooling device 1 of FIG.

  Here, all the components having the above-described configuration are made of aluminum, and the refrigerant to be filled is a fluorocarbon material.

  Friction stir welding is a joining method that can ensure airtightness with this aluminum container. Friction stir welding can be applied to castings such as aluminum die-casting, and a rupture phenomenon that occurs due to the influence of bubbles inside the casting during laser welding. No pinholes occur due to, and stable airtight quality can be obtained. Moreover, it is a preferable joining method because it does not apply much heat and warpage is reduced.

  Next, the manufacturing process by friction stir welding will be described.

  The assembly of the container 2 and the cover unit 3 is as shown in FIG. 5, which is a configuration diagram of a cut section taken along the plane B in FIG. 2, and the cover 8 is slightly longer on the outer peripheral side than the plate 10. It is placed on the lower surface of the step provided on the inner periphery of the outer edge 2 a on the top surface side corresponding to the opening surface 5 of the container 2, and both surfaces of the outer edge 2 a are flush with the outer surfaces of the cover 8 and the plate 10 and the spacers 12. It is trying to become.

  The boundary between the outer edge 2a, the cover 8, and the plate 10, indicated by the arrows in the figure, is friction stir welded to seal the heat radiation space 14 and the heat receiving space 16.

  FIG. 6 shows a range where friction stir welding is performed by a broken line portion. FIG. 6A is a view of the cooling device 1 as viewed from the cover 8 side, and the entire periphery of the cover 8 is friction stir welded. FIG. 6B is a view as seen from the plate 10 side of the cooling device 1, and the entire periphery of the plate 10 is friction stir welded.

  The cooling action by the refrigerant of the high heat generating component 20 in the above configuration will be described.

  FIG. 7 is a cross-sectional view of the cooling device installed vertically (cut cross-section along the plane C in FIG. 1). The refrigerant 21 that receives heat from the high heat-generating component 20 is vaporized in the vaporization direction 22, and the plurality of fins 7 are formed. It liquefies in the upper part provided and refluxes in the liquefaction direction 23. By repeating this cycle, the high heat generating component 20 is cooled.

  Here, the refrigerant 21 is sealed up to the installation height of the high heat generating component 20 in the container 2.

  Next, the most important features of the present invention will be described.

  As described in the background art, in the conventional cooling device, the refrigerant passage (evaporating part) is formed of an extruded mold material, so that there is strength of the passage where friction stir welding can be performed, but in various arrangements of the high heat generating component 20. Is not applicable.

  The present invention can be applied to various arrangements of the high heat-generating component 20 and has a shape of a container 2 in which a screwing projection can be formed on the heat receiving surface 6, and further rubs an aluminum casting container 2 that is not suitable for laser welding or the like. It is characterized by stir welding.

  In this case, the spacer 12 is configured to have a strength capable of friction stir welding.

  That is, when the friction stir welding is performed on the boundary between the outer edge 2a and the plate 10 described in the manufacturing process by the friction stir welding, the plate 10 cannot be held without the spacer 12, and the friction stir welding cannot be performed.

  Furthermore, the spacer 12 is constituted by a U-shaped spacer A12a and a spacer B12b provided with a plurality of grooves 13 through which the refrigerant passes, and the spacer B12b is provided at the boundary between the heat radiation space 14 and the heat receiving space 16, thereby dissipating heat. The space 14 and the heat receiving space 16 are communicated, and the refrigerant 21 can be circulated.

  Further, the structure in which the plurality of fins 7 penetrate the cover 8 and the plate 10 improves the contact efficiency with the refrigerant vaporized in the heat receiving space, can improve the cooling efficiency of the high heat generating components, and the plurality of fins 7 cover the cover. 8 and the plate 10 are fixed by brazing, so that the heat radiation space 14 can also be prevented from expanding in the longitudinal direction of the fin 7 due to the saturated vapor pressure of the refrigerant 21.

  In this embodiment, the spacer 12 is composed of the U-shaped spacer A12a and the spacer B12b provided with a plurality of grooves 13. However, as long as the strength of the friction stir welding can be maintained, a large number of columnar spacers may be provided. The shape of the spacer 12 is not limited to this embodiment, but the configuration of this embodiment is preferable because the number of parts is small.

  As described above, the cooling device of the present invention includes a plurality of fins having steps, a rectangular flat plate cover provided with slits corresponding to the number of the plurality of fins on one end side of the long side in parallel with the long side, A cover unit having a plate provided with slits for the number of fins, a spacer provided between the cover and the plate, and a plurality of protrusions corresponding to the arrangement of the heat generating components to be cooled are provided on the bottom surface. And a cooling device configured with a container having an opening on the opposite surface of the bottom surface, wherein the cover, the spacer, and the plate form a heat radiation space, and the cover unit includes the plurality of fins with the steps. Insert into the slit of the cover and the slit of the plate until it comes into contact with the cover, and braze in a state where the plurality of fins are present in the heat dissipation space. And inserting the plurality of fins protruding toward the plate into the opening of the container, disposing the container and the cover unit so as to form a heat receiving space with the bottom surface of the container and the cover, and The joint of the frame is friction stir welded to seal the heat radiating space and the heat receiving space and communicate the heat radiating space and the heat receiving space, so that the plurality of protrusions are freely disposed on the bottom surface of the container. Applicable to various arrangements of high heat generation electronic components.

  For this reason, the cooling device of the present invention can be used for cooling a remote radio device (RRU) or the like that uses highly heat generating electronic components such as a CPU and a power conversion element.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Container 3 Cover unit 4 Bottom surface 5 Opening surface 6 Heat receiving surface 6a Projection 7, 7b Fin 7a Step 8 Cover 8a Pipe hole 9, 9a Slit 10 Plate 11, 11a Slit 12 Spacer 12a Spacer A
12b Spacer B
13 Groove 14 Heat radiation space 15 Pipe 16 Heat receiving space 20 High heat generating component 21 Refrigerant 22 Evaporation direction 23 Liquefaction direction

Claims (2)

A plurality of fins having steps;
A rectangular flat cover provided with slits for the number of the plurality of fins on one end side of the long side in parallel with the long side;
A plate provided with slits for the number of the plurality of fins;
A spacer provided between the cover and the plate;
A cover unit with
Provided with a plurality of protrusions corresponding to the arrangement of the heat-generating components to be cooled on the bottom surface and a container having an opening on the opposite surface of the bottom surface
A cooling device that cools a heating element by phase conversion circulation of a refrigerant filled in a sealed space constituted by the cover unit and the container,
A heat dissipation space is formed by the cover, the spacer, and the plate,
The cover unit is
Insert the plurality of fins into the slits of the cover and the slits of the plate until the step comes into contact with the cover, and form by brazing with the plurality of fins present in the heat dissipation space,
Inserting the plurality of fins protruding toward the plate into the opening of the container, and arranging the container and the cover unit so as to form a heat receiving space with the bottom surface of the container and the cover,
A cooling device characterized in that a joint between the cover and the container is friction stir welded to seal the heat radiation space and the heat receiving space and to communicate the heat radiation space and the heat receiving space. The cooling device according to claim 1, wherein the spacer is provided on the entire circumference of the plate, and the spacer provided on the boundary between the heat radiation space and the heat receiving space is provided with a plurality of grooves through which the refrigerant passes.

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