JP3208516U - Water-cooled heat sink - Google Patents

Abstract

An object of the present invention is to fix a heat pipe to a heat sink base material in a strong contact state, and to prevent a contact failure, a thermal conduction imbalance, insufficient fixing strength, etc. A water-cooled heat sink is provided. A middle portion of the front and rear length of a heat pipe is disposed along a U-shaped groove of a heat sink base material, and each of the left and right standing walls is close to each other on the side surface of the heat pipe. The crimped portions 17 and 18 are formed by crimping in the direction of close contact, and are firmly fixed to the heat sink base material. Further, the upper end surface 21 of the heat pipe and the caulking portion is flattened to the same height as the upper surface 11 of the heat sink base material by pressing from above with the caulking. [Selection] Figure 1

Description

  The present invention relates to a water-cooled heat sink in which a heat pipe is fixed to a heat sink base material.

With the trend of the electronic age, product functions have become diversified, environmental awareness has become stronger, and product development corresponding to these has been required. In particular, it is important to develop a heat sink to reduce the size of the product while ensuring the existing performance conditions.
However, conventional heat sinks using natural cooling and forced air cooling are no longer compatible with products that require high power.

At present, the heat generated from the power-up product is dissipated by a water-cooled heat sink and a heat sink with a water-cooled inverter control. A heat pipe is fixed to the water-cooled heat sink. Although many adhesives are still used in this fixing, there are risks such as poor contact, thermal conduction imbalance, insufficient fixing strength, etc. at the bonding site when the adhesive is used.
For this reason, recent water-cooled heat sinks, as disclosed in Patent Document 1 and Patent Document 2, are caulked portions along both sides of the middle part of the length of the heat pipe, and the heat pipe is fixed to the heat sink base material. Mainstream.

2 to 4 of JP-A-2001-248982 1 to 6 of JP 2007-218439 A

  However, in the water-cooled heat sink disclosed in Patent Document 1, as shown in FIG. 3 of that Patent Document, the height of the upper surface of the heat pipe 7 disposed in the mounting groove is a position near the lower portion of the claw portion 10. Therefore, the claw portion 10 is caulked obliquely downward as shown in FIG. For this reason, even if the upper part of the heat pipe 7 is deformed in the expanding direction by pressing downward by the holding part 11, a gap is easily generated between the base inside of the claw part 7 after crimping and the heat pipe 7, The gap leads to heat conduction imbalance at the joint and insufficient fixing strength.

In the fixing method of the heat pipe disclosed in Patent Document 2, the width of the mounting groove 4 is larger than the outer diameter of the heat pipe 6, and the entire heat pipe 6 is deformed so as to be in close contact with the mounting groove 4 by pressing from above. ing. However, it is also expected that only the upper part of the heat pipe 6 is greatly deformed and does not deform until the lower part comes into close contact with the mounting groove 4.
1, 2, and 4 of the same patent document, since the upper part of the heat pipe 6 and the upper part of the rising wall 8 protrude above the upper surface of the heat receiving and radiating member 2, Installation space height increases. For this reason, it is not suitable for a heat sink for small electronic devices.

  In the present invention, the heat pipe is fixed to the heat sink base material in a strong contact state, and there is no contact failure, heat conduction imbalance, insufficient fixing strength, etc. It is an object of the present invention to provide a water-cooled heat sink that is suppressed to a height of 10 mm.

The water-cooled heat sink according to the present invention has the following structure.
(1) A water-cooled heat sink in which an intermediate length of the heat pipe is fixed to an aluminum heat sink base material. Examples of the aluminum include aluminum alloy and anodized aluminum.
(2) The middle part of the front and rear length of the heat pipe is disposed along the U-shaped groove, and further in the direction of being in close contact with the side surfaces of the heat pipe by the left and right standing walls. By the flat deformation that becomes the same height as the upper plate surface of each upper surface in the middle part of the length of the heat pipe and the caulking part by pressing from above performed with the caulking, It is firmly fixed in the U-shaped groove.

The water-cooled heat sink according to claim 2 has the following structure.
(1) The components according to claim 1 are provided.
(2) The heat pipe is U-shaped, and each of the parallel straight portions of the heat pipe is in close contact with the heat sink base material by the caulking and the pressing.

  The present invention fixes the heat pipe toward the heat sink base material in a tight contact state, and does not have poor contact, heat conduction imbalance, insufficient fixing strength, etc. It is an object of the present invention to provide a water-cooled heat sink that is suppressed to a vertical height.

  Preferred embodiments of the invention are described in detail in the following examples.

(A) is a perspective view of the water-cooled heat sink according to the first embodiment of the present invention, (b) is a front sectional view. (A)-(d) is the figure which showed the manufacturing process of the water cooling type heat sink in order, (a-1)-(d-1) is the principal part expanded sectional view of the left figure. (A) is a perspective view of the water-cooled heat sink according to the first embodiment of the present invention, (b) is a front sectional view.

[First Embodiment]
A water-cooled heat sink 100 according to the first embodiment shown in FIG. 1A is made by fixing the middle part of the length of one heat pipe 2 to an aluminum heat sink base 1A.
As shown in FIGS. 1A and 1B, the heat pipe 2 is disposed along the U-shaped groove 12 as shown in FIGS. 1A and 1B, and further, both sides of the U-shaped groove 12 are crimped. It is held in close contact with the letter-shaped groove 12.
The caulking may be performed in the entire length direction of the heat sink base material 1A. However, when the heat sink base material is divided into predetermined lengths as shown in FIG. Since the caulking corresponding to the thickness can be performed, the mold manufacturing cost can be greatly reduced, and the caulking closely adhered to the heat pipe 2 can be performed satisfactorily.

  The upper end surface 21 of the heat pipe 2 and the caulking-formed caulking portion 17.18 are molded into a flat surface having the same height as the upper surface 11 of the heat sink base material 1A by pressing from above with caulking. The space in the height direction of the place where the heat sink 100 is mounted is suppressed. Further, the press from above brings the heat pipe in the U-shaped groove into a strong and tight contact state.

FIG. 2 shows a manufacturing process of the water-cooled heat sink 100.
In the first step of this manufacturing process, a heat sink base material 1A made of a thick aluminum flat plate having a cross-sectional shape shown in FIGS. 2A and 2A-1 and a heat pipe 2 are prepared.

  The heat pipe 2 is a small-diameter round pipe made of copper or aluminum that is easily thermally deformed and plastically deformed.

The heat sink base 1A is formed with a U-shaped groove 12 and narrow grooves 13 and 14 along both sides of the U-shaped groove 12 on the upper surface 11 as shown in FIGS. 2 (a) and (a-1). A thick plate-shaped aluminum plate in which standing walls 15 and 16 are formed between the U-shaped groove 12 and the narrow grooves 13 and 14 is used.
The distance between the shape of the bottom 12a of the U-shaped groove 12 and both side walls of the U-shaped groove 12 is such that the heat pipe 2 can be accommodated. The depth of the U-shaped groove 12 is about 2/3 to 3/4 of the diameter of the heat pipe 2. The upper end surfaces of the standing walls 15 and 16 located on both sides of the U-shaped groove 12 are at the same height as the upper surface 11 of the heat sink substrate 1A.

In the next step shown in FIGS. 2 (b) and 2 (b-1), the middle portion of the length of the heat pipe 2 is arranged along the U-shaped groove 12.
A press die 3 in which two protrusions 32 and 33 having a V-shape directed downward are formed above the heat sink base 1A.
The distance between the two protrusions 32 and 33 is slightly narrower than the distance between the two narrow grooves 13 and 14. The vertical height of the two protrusions 32 and 34 is approximately the same as the depth of the narrow grooves 13 and 14. The lower surface of the press die 3 excluding the two protrusions 32 and 34 is a flat surface.

In the next step shown in FIGS. 2C and 2C-1, the press die 3 is lowered down to a position where the lower surface of the press die 3 is in contact with the upper surface 11 of the heat sink substrate 1A.
As a result, the protrusion 32 (34) enters the narrow groove 13 (14), and the inclined surface 33 (35) located inside the protrusions 32 and 33 undergoes plastic deformation in the direction in which the upright wall 15 (16) comes close. The upright wall 15 (16) is caulked until it is in close contact with the side surface of the heat pipe 2.

  At the same time as the crimping, the pressing surface 31 between the projections 32 and 34 on the lower surface of the press die 3 connects the upper surfaces of the crimped portions 17 and 18 which are the crimped standing walls 15 and 16 and the upper surface 21 of the heat pipe 2. By pressing from above, a flat surface having the same height as the upper surface 11 of the heat sink substrate 1A is formed. The deformation due to pressing of the caulking, the caulking portions 17 and 18 and the upper surface 21 of the heat pipe 2 causes the heat pipe 2 and the tossink base material 1 to be further strongly adhered. When the above steps are completed, the heat pipe 2 is firmly fixed to the heat sink base 1A.

  Thereafter, when the press die 3 is moved upward, the water-cooled heat sink 100 shown in FIGS. 1A, 1B, 2D, and 1D-1 is completed.

[Second Embodiment]
The water-cooled heat sink 200 according to the second embodiment shown in FIGS. 3A and 3B is obtained by fixing two straight portions of the U-shaped heat pipe 2 to the heat sink base material 1. Is performed in the same process as that of the first embodiment described above, and is the same as that of the first embodiment of the mounting structure.

Industrial application fields

  The water-cooled heat sink according to the present invention is used to cool the periphery of an electronic component board inside an electronic device, an electric device or the like. For this reason, the field of electronic equipment and electrical equipment becomes a field of use.

DESCRIPTION OF SYMBOLS 100 Water-cooled heat sink 200 Water-cooled heat sink 1A Heat sink base material 1B Heat sink base material 12 U-shaped groove 13,14 Narrow groove 15,16 Standing wall 17,18 Caulking part 2 Heat pipe

Claims (2)

A water-cooled heat sink in which the middle part of the length of the heat pipe is fixed to an aluminum heat sink base material,
The heat sink base material has a U-shaped groove reaching the front and rear ends of the heat sink base material, one narrow groove on each of the left and right along the both sides of the U-shaped groove, and the U-shaped groove. Left and right standing walls positioned between the upper portions of the side walls on both sides and the narrow groove, respectively, and the height of the upper surface of the standing walls is substantially aligned with the height of the upper plate surface. Thick flat plate shape is used,
A middle portion of the heat pipe in the front-rear length is disposed along the U-shaped groove, and is further caulked in a direction close to each other by the left and right standing walls and in close contact with the side surface of the heat pipe. And the U-shaped groove by a flat deformation that becomes the same height as the upper plate surface of each upper surface of the heat pipe in the middle of the length and each caulking portion by pressing from above performed together with the caulking A water-cooled heat sink characterized by being firmly fixed inside.   The water cooling according to claim 1, wherein the heat pipe is U-shaped, and each of the parallel straight portions of the heat pipe is fixed to the heat sink base material in a tight contact state by the caulking and the pressing. Heat sink.

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