JP2012021698A - Radiation fin and radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve radiation efficiency by devising a shape of a radiation fin and a position of a heat pipe.SOLUTION: The radiation fin 1 includes: a radiation opening 11 formed on the center of the same; heat pipe insertion holes 12 formed around the radiation opening 11; a first inclination part 13 the outer peripheral side of which is inclined obliquely downward against the heat pipe insertion holes 12; and a second inclination part 14 the inner peripheral side of which surrounding the radiation opening 11 is inclined obliquely upward against the heat pipe insertion holes 12. Concretely, the disk-like radiation fin 1 includes a plurality of heat pipe insertion holes 12, and the plurality of heat pipe insertion holes 12 are formed on mutually symmetrical positions.

Description

  The present invention relates to a radiating fin and a radiator using the radiating fin, for example, a radiator such as a semiconductor element.

Patent Document 1 proposes a heat dissipating fin that is attached to a heat dissipating part of a heat pipe and is inclined with respect to the heat pipe.
The heat dissipating fin of Patent Document 1 has a heat pipe mounting portion provided with a plurality of through holes for mounting a plurality of heat pipes near one side of the rectangular fin material, and penetrates from the opposite side toward the heat pipe mounting portion. The left and right radiating fins are cut to the vicinity of the hole, cut in a predetermined length beyond the heat pipe mounting part from the cutting tip to the left and right, and bent at a predetermined angle with respect to the heat pipe mounting part from the left and right cutting ends. It is configured.

Japanese Patent Application Laid-Open No. H10-228707 proposes a heat dissipating fin installed around a heat conductor such as a heat pipe or a heat column.
The heat dissipating fins of FIG. 10 of Patent Document 2 are provided radially from the center so as to extend outward from the center so as to be perpendicular to the surface of the hollow chamber.
Further, the heat dissipating fan of FIG. 11 of Patent Document 2 is provided so as to overlap around the hollow chamber.

JP 2001-28417 A JP 2005-101014 A

  However, the heat dissipating fin of Patent Document 1 is a special rectangular fin material, which requires troublesome processing such as bending a predetermined notch and then bending it by a predetermined angle.

The heat dissipating fin of FIG. 10 of Patent Document 2 makes it difficult to make a fin if a thin heat pipe is used when the object to be cooled is small, and even if an attempt is made to increase the fin to increase the heat dissipating efficiency, There arises a problem that the enlargement ratio is small.
Further, the heat dissipating fin of FIG. 11 of Patent Document 2 is a type in which a heat pipe is arranged in the center, the fin itself is flat, and the self-cooling function for dissipating heat by natural convection is weak. 12, 13 and the like, holes are made around the fins and a fan is provided to forcibly dissipate heat.

  An object of the present invention is to devise the shape of the radiating fins and the position of the heat pipe to improve the radiating efficiency by natural convection.

  In order to solve the above-described problems, the invention according to claim 1 is directed to a central heat radiating port, a surrounding heat pipe insertion hole, and a plane on the outer peripheral side of the heat pipe insertion hole including the heat pipe insertion hole. A first inclined portion that inclines in a first direction, and an inner peripheral side that surrounds the heat radiation port with respect to the heat pipe insertion hole inclines to a side opposite to the first inclined portion with respect to a surface including the heat pipe insertion hole. And a heat dissipating fin including two inclined portions.

  A second aspect of the present invention is the heat dissipating fin according to the first aspect, wherein a plurality of the heat pipe insertion holes are provided.

  A third aspect of the present invention is the heat dissipating fin according to the second aspect, wherein the plurality of heat pipe insertion holes are provided at axially symmetrical positions with respect to a central axis of the heat dissipating hole.

  A fourth aspect of the present invention is the heat dissipating fin according to any one of the first to third aspects, wherein the fin has a disk shape in plan view.

  The invention according to claim 5 is characterized by a radiator in which the heat dissipating fins according to any one of claims 1 to 4 are overlapped and a heat pipe is inserted and fixed in the heat pipe insertion hole.

  According to the present invention, air flows from the outer peripheral side of the fin to the inner peripheral side, and heat dissipation efficiency can be improved.

(A) is a side view which shows the structure of one Embodiment of the radiation fin to which this invention is applied, (b) is a longitudinal cross-sectional view of (a). It is a perspective view which shows an illuminating device provided with the heat radiator to which this invention is applied. It is the front view (a) and side view (b) of the illuminating device of FIG. It is an enlarged view of the heat radiator part of FIG. In the front view of a radiator, it is the figure (a) which showed A type, the figure (b) which showed B type, and the figure (c) which showed C type. It is the top view which shows the arrangement of the heat pipe, in figure (a) which shows A type, figure (b) which shows B type, figure (c1) which shows C1 type, figure (c2) which shows C2 type is there. It is the top view (a) and side view (b) which showed the A type radiation fin. It is the top view (a) and side view (b) which showed the B type radiation fin. It is the top view (a) and side view (b) which showed the C type radiation fin.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1A and 1B show a configuration of an embodiment of a heat radiation fin to which the present invention is applied. FIG. 1A is a side view, and FIG. 1B is a longitudinal sectional view of FIG. In the figure, 1 is a radiation fin and 2 is a heat pipe.

The radiating fin 1 has a disk shape in plan view. As shown in the figure, the radiating fin 1 has a circular radiating port 11 formed in the center, and a heat pipe at an axially symmetric position with respect to the central axis of the surrounding disk. An insertion hole 12 is formed.
The outer peripheral side of the heat pipe insertion hole 12 is formed in a first inclined portion 13 that is inclined obliquely downward, which is the first direction with respect to the plane including the heat pipe insertion term hole, with respect to the heat pipe insertion hole 12. An inner peripheral side surrounding the heat radiation port 11 is formed in a second inclined portion 14 that is inclined obliquely upward, which is a second direction opposite to the first direction with respect to the surface including the heat pipe insertion hole.

The heat radiating fins 1 are stacked one above the other as shown in the figure, and the heat pipes 2 are press-fitted into the heat pipe insertion holes 12 from below.
That is, the heat pipe insertion hole 12 is subjected to burring from below, and the heat pipe 2 is press-fitted into the burring heat pipe insertion hole 12 from below to fit with good contact.

Here, the radiation fin 1 is made of a good heat conductor such as aluminum or copper.
The container of the heat pipe 2 is made of heat transport or a heat conductor such as a heat transfer tube such as a copper tube, an aluminum tube, an iron tube, or a stainless tube.

In the above, the pitch (attachment interval) of the radiation fins 1 attached to the heat pipe 2 is 2 to 15 mm, and 5 to 8 mm in the case of natural convection.
The inclination angle of the first inclined portion 13 and the second inclined portion 14 with respect to the flat plate portion (horizontal portion) is about 15 to 70 °, preferably 30 to 45 °.

  2 and 3 show an illuminating device including a radiator to which the present invention is applied. In the figure, 3 is a heat receiving block, 4 is a radiator, 5 is a power LED (heating element), 6 is a cover, and 7 is a cover. A base board, 8 is a standing frame, and 9 is an adjusting screw.

As shown in the figure, a heat radiator 4 is configured by superposing heat radiation fins 1 on the heat receiving block 3 through the heat pipe 2.
On the lower surface of the heat receiving block 3 of the heat radiator 4, a plurality of (two in the illustrated example) power LEDs (Light Emitting Diodes) 5 that are heating elements are attached.

The radiator 4 is provided with an inverted U-shaped cover 6 that also serves as a holder surrounding the radiation fin 1 from the upper surface of the heat receiving block 3.
Further, the radiator 4 is assembled with an adjustment screw 9 through a cover 6 to a standing frame 8 on a base board 7 of a lighting device for surface inspection or the like.

  FIG. 4 is an enlarged view of the radiator 4.

FIG. 5 shows the radiator 4 from the front.
That is, FIG. 5A shows an A type in which the radiating fin 1 has a small outer diameter and a small number of 10 sheets.
FIG. 5B shows a B type in which the outer diameter of the heat dissipating fin 1 is medium and the number is 18 as many.
FIG.5 (c) has shown C type with the largest outer diameter of the radiation fin 1, and 22 sheets.

FIG. 6 is a plan view showing the arrangement of the heat pipes 2.
That is, FIG. 6A shows the A type, and an L-shaped heat pipe that takes into consideration that the heat transfer area is increased along two grooves formed in parallel to the upper surface of the heat receiving block 3. 2 are joined and are erected opposite to each other in the diameter direction.
FIG. 6B shows the B type, and an L-shaped heat pipe 2 that takes into consideration that the heat transfer area is increased along four grooves formed in parallel to the upper surface of the heat receiving block 3. They are joined and erected in the diametrical direction.

FIG. 6 (c 1) shows the C1 type, and an L-shaped heat that takes into account the large heat transfer area along three sets of six grooves formed in parallel on the upper surface of the heat receiving block 3. The pipes 2 are joined to each other and are erected opposite to each other in the diameter direction.
FIG. 6 (c2) shows the C2 type, and an L-shaped heat that takes into account the large heat transfer area along three sets of six grooves formed in parallel on the upper surface of the heat receiving block 3, respectively. The pipes 2 are joined to each other and are erected opposite to each other in the diameter direction.

  Although the heat pipe 2 is L-shaped, the U-shaped heat pipe 2 is designed so that the heat transfer area is large. May be.

  FIGS. 7A and 7B show an A-type radiating fin 1, in which two heat pipe insertion holes 12 facing in the diametrical direction are formed.

  FIGS. 8A and 8B show a B-type radiating fin 1, and two sets of four heat pipe insertion holes 12 opposed in the diameter direction are formed at equal intervals in the circumferential direction.

  FIGS. 9A and 9B show a C-type heat radiating fin 1, in which three sets of six heat pipe insertion holes 12 facing in the diametrical direction are formed at equal intervals in the circumferential direction.

In the heat radiating fin 1, the periphery of the fin upper surface portion of the heat pipe insertion hole 12 is a burr portion 12 b that slightly protrudes upward as shown in the figure by burring from below.
Therefore, when the heat pipe 2 is press-fitted into the heat pipe insertion hole 12 from below, the heat pipe 2 is fitted to the tip of the burring portion 12b with good contact.

  As described above, according to the radiator 4 of the embodiment, the heat generated by energization of the power LED 5 is transmitted from the heat receiving block 3 to the heat radiating fin 1 through the heat pipe 2, and is dissipated by natural convection of air in the radiating fin 1. The

  And, as indicated by the arrows in FIG. 1, between the heat radiating fins 1, the heat pipe insertion holes 12 provided around the fins from the first inclined part 13 inclined obliquely downward provided on the outer peripheral side of the fins. The heat is diverted by the heat pipe 2 inserted into the fin, passes through the second inclined portion 14 inclined obliquely upward provided on the inner peripheral side of the fin, flows to the heat radiation port 11 provided in the center of the fin, and is discharged upward.

  In this way, air naturally convects from the outer periphery of the fin to the heat radiating port in the center of the fin, and convection is promoted by the tunnel effect, thereby improving heat dissipation efficiency.

  The radiator 4 can also be used horizontally. In this case, a forced convection device such as a fan may be provided.

  In addition, the wick (capillary structure) of the heat pipe is usually a groove (groove), but if this is a sintered metal, the heat transport performance can be achieved in any inclined arrangement such as vertical, horizontal, oblique, and top heat arrangement. A heat radiator with a small fluctuation is obtained.

In the above embodiment, although it applied to the illuminating device, this invention is not limited to this, You may apply to an apparatus provided with other heat generating elements, such as a thyristor.
In the embodiment, the shape of the radiating fin is a disc shape, but may be a polygonal shape.
Further, a fan may be provided at the heat radiating port in the center of the heat radiating fins for forced air cooling, and it is needless to say that other specific detailed structures can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Radiation fin 11 Radiation opening 12 Heat pipe insertion hole 12b Burring part front-end | tip 13 1st inclination part 14 2nd inclination part 2 Heat pipe 3 Heat receiving block 4 Radiator 5 Heating element 6 Cover 7 Base board 8 Standing frame 9 Adjustment screw

Claims (5)

The center heat dissipation port,
Surrounding heat pipe insertion holes,
A first inclined portion whose outer peripheral side is inclined in a first direction with respect to a plane including the heat pipe insertion hole with respect to the heat pipe insertion hole;
An inner peripheral side surrounding the heat radiation port with respect to the heat pipe insertion hole includes a second inclined portion inclined in a second direction opposite to the first direction with respect to a surface including the heat pipe insertion hole. A heat dissipating fin.   The heat radiating fin according to claim 1, wherein a plurality of the heat pipe insertion holes are provided.   The radiating fin according to claim 2, wherein the plurality of heat pipe insertion holes are provided in axially symmetrical positions with respect to a central axis of the radiating hole.   The heat dissipating fin according to any one of claims 1 to 3, wherein the heat dissipating fin has a disk shape in a plan view.   A heat radiator, wherein the heat dissipating fins according to any one of claims 1 to 4 are overlapped and a heat pipe is inserted and fixed in the heat pipe insertion hole.

Images