JP7133960B2 - assembled fins - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled fin in which a cooling surface extends according to a bend formed in a passage through which cooling air is supplied.

2. Description of the Related Art Electronic parts such as semiconductor elements mounted in electrical and electronic equipment generate a large amount of heat due to high-density mounting and the like accompanying high functionality, and in recent years, cooling thereof has become more important. In addition, due to the miniaturization of electronic devices, heat generating bodies such as electronic components are sometimes arranged in narrow spaces. 2. Description of the Related Art Radiation fins are sometimes used as a method of cooling a heat generating body such as an electronic component arranged in a narrow space.

As a cooling device using heat radiation fins, for example, a heat sink provided with a plurality of cylindrical heat radiation fins is proposed to cool heating elements such as CPUs, LSIs, and power semiconductors (Patent Document 1). .

However, since it is difficult to increase the surface area of the cylindrical heat radiation fins used in Patent Document 1, so-called pin fins, there is a problem that the cooling performance may not be sufficiently improved. there were. Further, a heat generating body such as an electronic component may be placed in a narrow space, for example, in a curved portion of a flow path such as a pipe to which cooling air is supplied. In this case, if the pin fins are installed in the curved portion of the flow path, the cooling air is biased to the outside of the curved portion, so the cooling performance differs between the inside and outside of the curved portion, and the heating element cannot be sufficiently cooled.

Moreover, in order to supplement the cooling performance of the pin fins, there are cases in which flat plate-shaped heat radiation fins are further attached to the pin fins. As a method of attaching the plate-shaped heat radiation fins to the pin fins, for example, a method of providing through holes in the plate-shaped heat radiation fins and inserting the pin fins into the through holes can be mentioned. However, since burring processing is required at the contact portion between the plate-shaped heat-dissipating fins and the pin fins, there are restrictions on the diameter and pin pitch of the pin fins, and there is room for improvement in miniaturization. Therefore, in some cases, the cooling device in which the plate-like heat radiation fins are further attached to the pin fins cannot cope with heat generating bodies such as electronic components arranged in a narrow space.

JP 2014-116404 A

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a fin that can exhibit excellent cooling performance even when installed in a narrow space where a flow path to which cooling air is supplied is bent. .

An aspect of the present invention is an assembly fin in which a plurality of fin members having a first surface and a second surface extending from the first surface via a bent portion are connected, and the second surface is , assembled fins having a non-linear portion corresponding to a bend formed in a flow path through which cooling air is supplied.

In an aspect of the present invention, in a plan view, the radius of curvature (R1) of the non-linear portion is greater than or equal to the radius of curvature (R2) on the inner side of the bend of the flow path and less than or equal to the radius of curvature (R3) on the outer side of the bend of the flow path. It is an assembled fin.

In the present specification, "planar view" means a state in which the first surface is viewed from a vertical direction.

An aspect of the invention is the assembled fin, wherein at least one of said fin members has a plurality of second surfaces.

An aspect of the present invention is an assembled fin in which at least one of the plurality of fin members has a shape different from that of the other fin members.

An aspect of the present invention is an assembly fin in which the plurality of fin members are connected by laser welding.

An aspect of the present invention is an assembled fin in which the plurality of fin members are connected by fitting portions.

An aspect of the present invention is an assembly fin in which the plurality of fin members are connected by a shaft.

According to the aspect of the assembled fin of the present invention, the second surface of the fin member has a non-linear portion corresponding to the bend formed in the flow path through which the cooling air is supplied, so that the cooling air can flow in a narrow space. Even if the assembled fins are installed at a portion where the flow path to which the heat is supplied is bent, excellent cooling performance can be exhibited. In addition, according to the assembled fin aspect of the present invention, the thickness of the second surface that functions as a cooling surface can be reduced, so that it is possible to reduce the size and weight of the fin.

According to the aspect of the present invention, the radius of curvature (R1) at the non-linear portion of the second surface is greater than the radius of curvature (R2) at the inner side of the bend of the flow path of the cooling air (R3). ), it is possible to prevent the cooling air from being biased toward the inside or outside of the bend of the flow path, so that excellent cooling performance can be reliably exhibited.

According to this aspect of the invention, the fin member has a plurality of second surfaces, so that the number of parts of the assembled fin can be reduced.

FIG. 4 is an upper perspective view illustrating an installed state of the assembled fins according to the first embodiment of the present invention; FIG. 2 is a bottom perspective view illustrating an assembled fin according to the first embodiment of the present invention; FIG. 11 is an upper perspective view illustrating assembled fins according to a second embodiment of the present invention; FIG. 11 is a bottom perspective view illustrating an assembled fin according to a second embodiment of the present invention; FIG. 10 is an enlarged view of a connecting portion of fin members in the assembled fin according to the second embodiment of the present invention; FIG. 8 is an exploded view of a fin member that is a component of the assembled fin according to the second embodiment of the present invention; FIG. 10 is an explanatory diagram of a fin member that is a component of the assembled fin according to the second embodiment of the present invention;

An assembled fin according to a first embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the assembled fin 1 according to the first embodiment is formed by connecting a plurality of fin members 11 in the width direction of the fin members 11 . The fin member 11 has a first surface 12 and a second surface 13 extending from the first surface 12 via a bent portion 14 . In the fin member 11, the first surface 12 is planar, and the second surface 13 is a single plate and has a thin plate shape. The second surface 13 is erected vertically with respect to the first surface 12 . Therefore, the cross-sectional shape of the fin member 11 when viewed from the side is L-shaped.

In the assembled fin 1, the plurality of fin members 11 are arranged such that the second surfaces 13 are arranged in parallel and face each other at a predetermined interval, and the first surfaces 12 are connected in a row. are connected. In the assembled fin 1, a plurality of second surfaces 13 are erected at predetermined intervals, thereby forming a heat radiating fin portion composed of a plurality of thin plates. That is, the second surface 13 functions as a heat radiation fin for the assembly fin 1. As shown in FIG. On the other hand, a plate-shaped bottom surface is formed by arranging adjacent first surfaces 12 in contact with each other. The plate-shaped bottom surface portion where the first surfaces 12 are connected functions as a heat receiving plate for the assembly fin 1 .

Therefore, the tip of the first surface 12 forming the plate-shaped bottom portion is in contact with the bent portion 14 of the other adjacent fin member 11, whereas the tip of the second surface 13 ( top) is a free end. Further, the tip portions of the adjacent second surfaces 13 are open. Furthermore, the space between one side end and the other side end formed by the adjacent second surfaces 13 are also open. Cooling air is supplied into the assembled fin 1 from one open side end, and is discharged out of the assembled fin 1 from the other open side end.

In the assembled fin 1, the first surfaces 12 of the respective fin members 11 all have the same width, so all the fin members 11 have the same width as each other. Also, the angles of the bent portions 14 of the respective fin members 11 are all the same. As described above, the second surfaces 13 are erected at approximately equal intervals. The second surfaces 13 of the respective fin members 11 have the same height.

As shown in FIG. 1 , the assembly fin 1 is installed in the curved portion of the internal space of the flow path 100 . Cooling air is supplied to the flow path 100 in which the assembled fins 1 are installed. In other words, the flow path 100 is a circulation path for the cooling air. In FIG. 1, the longitudinal direction of the second surface 13 is the longitudinal direction of the channel. In this specification, the term “flow path” refers to a space that is closed in the circumferential direction (perpendicular to the direction of flow of cooling air) and open or circulated in the longitudinal direction (direction of flow of cooling air). , means the flow path of the cooling air.

The second surface 13 is bent in the longitudinal direction according to the degree of bending of the curved portion of the channel 100 . The second surface 13 may be bent in an arc shape or may be bent, but the second surface 13 of the assembled fin 1 has a bent portion 15 that is vertically bent from the second surface 13 at a predetermined angle. formed. In the assembled fin 1, if the same fin member 11 is used, the bending angles of the bent portions 15 are substantially the same.

This bent portion 15 forms a nonlinear portion 16 of the second surface 13 . The bent portion 15 of the second surface 13 extends linearly from the boundary between the first surface 12 and the second surface 13, that is, the position of the bent portion 14 to the tip of the second surface 13. . A plurality of (three in FIG. 1) bent portions 15 are provided on the second surface 13 . A non-linear portion 16 corresponding to the bending formed in the flow path 100 is formed in the fin member 11 from the plurality of bent portions 15 . In addition, the shape of the first surface 12 in a plan view corresponds to the formation of the non-linear portion 16 corresponding to the bend formed in the flow path 100 on the second surface 13 . It has a non-straight portion 16 corresponding to the bending formed in.

In the assembled fin 1, in each fin member 11, the radius of curvature (R1) of the imaginary circle inscribed by all the bent portions 15 is equal to or greater than the radius of curvature (R2) of the innermost curved portion of the flow path 100 in any fin member 11. It is equal to or less than the outermost radius of curvature (R3) of the curved portion of the channel 100 . Further, the curvature radius (R1) of the fin member 11 arranged in the outward direction of the curved portion of the flow channel 100 is more than the curvature radius (R1) of the fin member 11 arranged in the inner direction of the curved portion of the flow channel 100. is also getting bigger. Further, the radius of curvature (R1) of the fin member 11 increases from the inside of the curved portion of the flow path 100 toward the outside of the curved portion. Therefore, each fin member 11 has a shape different from the other fin members 11 in terms of the degree of bending of the nonlinear portion 16 .

Although the connecting means between the fin members 11 is not particularly limited, in the assembled fin 1, a convex portion 17 protruding from the tip portion of the first surface 12 on the same plane as the first surface 12 and the convex portion 17 are opposed to each other. Further, the fin members 11 are connected to each other at the fitting portion using the convex portion 17 and the concave portion 18 that can be fitted. The recessed portion 18 is a notch cut out from the bent portion 14 along the first surface 12 . In the assembled fin 1, each fin member 11 is provided with a plurality of (two in FIGS. 1 and 2) fitting portions. By fitting the convex portion 17 of one fin member 11 into the concave portion 18 of the other fin member 11 adjacent to the one fin member 11, the fin members 11 are connected and fixed.

The fin member 11 can be manufactured by bending a flat thin plate, that is, by performing sheet metal processing. By manufacturing the fin member 11 by sheet metal processing, the thickness of the second surface 13 functioning as a cooling surface can be reduced, so that the assembled fin 1 can be further reduced in size and weight. Moreover, since the space between adjacent second surfaces 13 can be narrowed, the heat dissipation characteristics of the assembled fin 1 are further improved.

As shown in FIG. 1 , the assembly fin 1 is installed in the curved portion of the flow path 100 to be thermally connected to the heating element 101 to be cooled arranged in the curved portion. Since the second surface 13 of the fin member 11 has the non-linear portion 16 having a bend corresponding to the bending of the curved portion formed in the flow channel 100, the cooling air flows through the curved portion of the flow channel 100 to the assembled fin. It can flow smoothly along the respective second surfaces 13 of the 1 . Therefore, when the assembly fin 1 is thermally connected to the heating element 101 at the curved portion of the flow path 100, the cooling performance of each of the second surfaces 13 is made uniform, and excellent cooling performance can be exhibited.

Further, in the assembled fin 1, the radius of curvature (R1) of each fin member 11 is greater than or equal to the radius of curvature (R2) at the innermost curved portion of the flow channel 100 at the outermost curved portion of the flow channel 100. The radius of curvature (R3) is less than or equal to the radius of curvature (R3), and the radius of curvature (R1) of the fin member 11 increases from the inside of the curved portion of the flow path 100 toward the outside of the curved portion. Therefore, it is possible to prevent the cooling air from biasing toward the inside or outside of the curved portion of the flow path 100 in the assembled fin 1, so that the assembled fin 1 can reliably exhibit excellent cooling performance.

Next, an assembled fin according to a second embodiment of the invention will be described. The same components as those of the assembled fin according to the first embodiment will be described using the same reference numerals.

In the assembled fin 1 according to the first embodiment, the fin member 11 has one first surface 12 and one second surface 13 extending from the first surface 12 via the bent portion 14. 3 and 4, in the assembled fin 2 according to the second embodiment, the fin member 21 extends from one first surface 12 via the bent portion 14 instead. Two second surfaces 13 are formed. The two second surfaces 13 are positioned to face each other. Therefore, the assembled fin 2 has a corrugated shape.

A flat extension 23 extends in a direction substantially parallel to the first surface 12 from the tip (bottom) of each second surface 13 . The extending portion 23 extends outward from the second surface 13 .

As shown in FIG. 5, in the adjacent fin members 21, the fin member 21 has a portion 23-1 where the extending portions 23 overlap each other in plan view and a portion 23-1 where the extending portions 23 do not overlap each other in plan view. It has a part 23-2. Adjacent fin members 21 are connected by joining the extending portions 23 at the overlapping portions 23-1. A means for joining the overlapping portions 23-1 is not particularly limited, but welding can be mentioned as an example, and a specific example thereof is laser welding.

In the extending portion 23, the outer surface of the overlapping portion 23-1 and the outer surface of the non-overlapping portion 23-2 are positioned on the same plane. Therefore, when the extending portion 23 is used as a heat receiving portion from a heating element (not shown in FIGS. 3 to 5), thermal connectivity between the assembly fin 2 and the heating element is improved. In addition, the heat conduction from the heating element to the assembled fins 2 is improved by forming only a partial region of the extending portion 23 as an overlapping portion 23-1 instead of making the entire extending portion 23 an overlapping portion. can be maintained.

In the assembled fin 2, since the tops of the two second surfaces 13 of the fin member 21 are continuous with the first surface 12 via the bent portion 14, the distance between the tops of the second surfaces 13 is The same fin member 21 has a closed portion, and the adjacent fin members 21 have an open portion.

Further, in the assembled fin 1 according to the first embodiment, the second surfaces 13 of the fin members 11 have the same height. In the assembled fin 2 according to the second embodiment, each fin member 21 has a different height of the second surface 13 . In the assembled fin 2, the second surface 13 of the fin member 21 arranged on the side in the width direction of the flow channel (not shown in FIG. 3) has a relatively low height, The height of the second surface 13 of the fin member 21 increases toward the central portion of the fin member 21 .

According to the above-described aspect, even when the flow path is, for example, a tubular material having an elliptical cross-sectional shape in the radial direction, the second surface 13 functioning as a heat radiating fin can be arranged over the entire internal space of the tubular material. . Therefore, the assembled fins 2 can exhibit even better cooling performance.

In the assembled fin 2 according to the second embodiment, one fin member 21 has two second surfaces 13, so that the number of parts of the assembled fin 2 can be reduced. Also, in the assembled fin 2 according to the second embodiment, similarly to the assembled fin 1 according to the first embodiment, when thermally connected to the heating element at the curved portion of the flow path, each of the second The cooling performance of the surface 13 is made uniform, and excellent cooling performance can be exhibited.

Next, an example of a method for manufacturing the fin member 21 that constitutes the assembled fin 2 according to the second embodiment will be described. Here, a method of manufacturing the fin member 21 by sheet metal working will be described as an example.

As shown in FIG. 6, a sheet metal 21' having portions to be the first surface 12, the second surface 13, and the extending portion 23 is prepared. The sheet metal 21' is provided with cuts having an angle [alpha] to form a bend in the fin member 21 along the curved portion of the flow path. First, the sheet metal 21' is vertically bent along the bending lines 30 and 31 to form the first surface 12 and the second surface 13 of the fin member 21 shown in FIG. At this time, both edge portions of the cut portions facing each other at an angle α are brought into contact with each other to form a connected second surface 13 . In addition, by the cut portion having the angle α, the connecting second surface 13 can be bent along the curved portion of the flow channel, and as a result, the fin member 21 can be bent along the curved portion of the flow channel. Next, the sheet metal 21' can be vertically bent outward along the bending lines 32, 33 to form the extensions 23 of the fin members 21 shown in FIG.

Next, another embodiment of the present invention will be described. In the assembled fin according to the first embodiment, the fin members are connected by the fitting means, but the means for connecting the fin members is not particularly limited. The fin members may be connected to each other by providing a through hole in the through hole and inserting the support rod into the through hole. Examples of the support rod include metal members and heat pipes. In addition, in the assembly fin according to the second embodiment, the fin members are connected to each other by joining the extending portions. By doing so, the fin members may be connected to each other. In the assembled fin according to the second embodiment, since the fin members are connected to each other by the supporting rod, there is no need to provide overlapping portions of the extension portions, so the thermal conductivity from the heating element to the assembled fin is further improved. improves.

In the assembled fins according to the first embodiment, the height of the second surface functioning as a heat radiating fin was the same for all fin members. Different fin members may be used. Also, in the assembled fin according to the second embodiment, the height of the second surface differs for each fin member, but instead of this, the height of the second surface may be the same. In this case, since the first surface of each fin member is positioned on the same plane, the first surface may be used as a heat receiving portion from the heating element.

In the assembled fins according to the above embodiments, each fin member has the same dimension in the width direction, but instead of this, a predetermined fin member may have a width different from that of the other fin members. good. Also, in the assembled fins according to the above embodiments, the second surface is set upright with respect to the first surface, but the angle of the second surface with respect to the first surface is particularly It is not limited, and may be 90°, for example, 60° or more and less than 90°.

The assembled fin of the present invention can exhibit excellent cooling performance for the heating element even if the heating element to be cooled is installed in a portion where the flow path to which the cooling air is supplied is bent. For example, it is highly useful in the field of cooling a heating element installed in a narrow space with a restricted cooling air path.

Reference Signs List 1, 2 assembled fins 11, 21 fin member 12 first surface 13 second surface 14 bent portion 16 non-linear portion

Claims (7)

A fin member having a first surface and a second surface extending from the first surface via a bent portion is an assembly fin in which a plurality of fin members are connected,
the second surface has a non-linear portion corresponding to the bend formed in the flow path to which the cooling air is supplied ;
An assembly fin in which the entire plate-shaped bottom surface formed by connecting the adjacent first surfaces in contact with each other is installed at the bent portion of the flow path . 2. The method according to claim 1, wherein, in plan view, the radius of curvature (R1) of the non-linear portion is not less than the radius of curvature (R2) on the inside of the bend of the flow path and the radius of curvature (R3) on the outside of the bend of the flow path. Assembled fins as described. 3. A fin assembly according to claim 1 or 2, wherein at least one said fin member has a plurality of second faces. The assembled fin according to any one of claims 1 to 3, wherein at least one of the plurality of fin members has a shape different from that of the other fin members. The assembled fin according to any one of claims 1 to 4, wherein the plurality of fin members are connected by laser welding. The assembly fin according to any one of claims 1 to 4, wherein the plurality of fin members are connected by fitting portions. The assembled fin according to any one of claims 1 to 4, wherein the plurality of fin members are connected by a shaft.

Images