JP2013251174A - Heat radiation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight heat radiation member excellent in heat radiation.SOLUTION: A heat radiation member 1, wherein a metal plate 10 corrugated by being bent along a plurality of bending starting point lines 11 is arranged to have a whole shape in a cylindrical shape while the bending starting point lines 11 are aligned in an axial direction, has a plurality of fins 13 radially arranged in a radial direction of the cylindrical shape, with neighboring fins 13 connected with each other at an inner peripheral side 101 and an outer peripheral side 102 of the cylindrical shape. The heat radiation member 1 of the cylindrical shape has a joining end 12 on its one end 115 in an axial direction X, and is used by joining a joining end 12 side with a heat generation member.

Description

  The present invention relates to a heat radiating member that promotes heat radiating from an electric device such as a lighting fixture.

  For example, along with higher performance of LEDs, lighting fixtures using LEDs as light sources have been put into practical use. Such a luminaire includes, for example, a heat radiating member integrally formed with heat radiating fins in order to promote heat radiation. As a conventional heat radiating member, a forged product or cast product of an aluminum alloy integrally provided with a heat radiating fin as shown in Patent Document 1, for example, is often used.

JP 2010-73654 A

  A conventional heat radiating member made of an aluminum alloy forging or casting can secure heat radiation to some extent, but is heavy, has low productivity, and is relatively expensive. Therefore, development of a lightweight and low-cost heat radiating member is desired while exhibiting a heat radiating property equivalent to or higher than that of a conventional heat radiating member.

  The present invention has been made in view of such a background, and is intended to provide a lightweight heat radiating member that is excellent in heat dissipation.

One aspect of the present invention is a heat dissipating member in which a metal plate bent along a plurality of bending origin lines and formed into a corrugated shape is arranged so that the overall shape becomes a cylindrical shape with the bending origin lines aligned in the axial direction. Because
The plurality of fin portions arranged radially in the radial direction of the cylindrical shape, and the adjacent fin portions are alternately connected on the inner peripheral side and the outer peripheral side of the cylindrical shape,
The cylindrical heat radiation member has a joining end portion at one end in the axial direction, and the joining end portion side is joined to a heat generating member (Claim 1).

As described above, the heat dissipating member has a plurality of fin portions arranged radially in the radial direction, and the adjacent fin portions are alternately connected on the inner and outer peripheral sides of the cylindrical shape. . Therefore, in the said heat radiating member, the surface area of a cylindrical side surface can be increased, and the heat dissipation from a side surface can be improved. Further, since a space is formed inside the cylindrical heat radiation member, the air cooling performance can be improved.
The heat dissipation member is formed by bending a metal plate. Therefore, for example, weight reduction can be achieved compared with the heat radiating member which consists of a conventional forged product etc., for example.

  The overall shape of the heat dissipating member is cylindrical. Therefore, it becomes easy to apply to the heat radiating member for lighting fixtures, such as a downlight etc. whose cylindrical shape is suitable.

The perspective view of the heat radiating member which joined the base board in Example 1. FIG. The top view of the heat radiating member which joined the base board in Example 1. FIG. The side view of the heat radiating member which joined the base board in Example 1. FIG. Explanatory drawing which expands and shows the partial cross section of the radial direction of the cylindrical-shaped heat radiating member in Example 1. FIG. Explanatory drawing which shows the state which observed the metal plate which carried out the corrugation-shaped bending process in Example 1 from the formation direction of a bending origin line. Explanatory drawing which shows a mode that the corrugated metal plate in Example 1 is bent in the shape of a cylinder in the state which aligned the bending origin line in the axial direction. FIG. 3 is an explanatory diagram illustrating a configuration of a downlight equipped with a heat dissipation member in the first embodiment.

Next, a preferred embodiment of the heat dissipation member will be described.
The heat dissipating member is formed by arranging a corrugated metal plate that is bent along a plurality of bending origin lines so that the overall shape is a cylindrical shape with the bending origin lines aligned in the axial direction. ing.
As the metal plate, an aluminum alloy plate (including a pure aluminum plate), a steel plate, a copper plate, or the like can be used. Moreover, as a metal plate, the precoat metal plate in which the resin layer which has the heat dissipation superior to a metal plate was formed in the surface can be used.

Preferably, the metal plate is an aluminum alloy plate or a precoated aluminum alloy plate having a resin layer on at least one surface of the aluminum alloy plate.
In this case, the lightness and heat dissipation of the heat dissipation member can be improved by utilizing the lightness and heat dissipation of the aluminum alloy plate. Moreover, when a precoat aluminum alloy plate is used, the heat dissipation of a heat radiating member can be further improved by the resin layer excellent in heat dissipation.
The heat dissipation can be evaluated by the integrated emissivity of infrared rays. The resin layer of the precoated aluminum alloy plate is preferably adjusted so that the infrared integrated emissivity is 70% or more. Thereby, stable heat dissipation characteristics can be obtained. The infrared integrated emissivity can be measured by comparing the amount of infrared radiation of the sample and the ideal black body by FT-IR. In general, the infrared integrated emissivity of the aluminum alloy plate is 15 to 18%.

  As a material of the aluminum alloy plate, a material suitable for forming such as 1000 series, 3000 series, 5000 series, and 6000 series can be used. For example, there are 1050, 8021, 3003, 3004, 3104, 5052, 5182, 5N01 and the like. The plate thickness of the aluminum alloy plate is not particularly limited, but is preferably 0.3 mm to 1.5 mm from the viewpoint of ease of manufacture and ease of processing.

  The heat radiating member has a plurality of fin portions arranged radially in the radial direction of the cylindrical shape. The interval between the fin portions is preferably 3 mm or more, more preferably 5 mm or more in order to improve air permeability. When the interval between the fin portions is not uniform, the shortest interval is preferably 3 mm or more, and more preferably 5 mm or more as described above.

  The adjacent fin portions are alternately connected on the inner peripheral side and the outer peripheral side of the cylindrical shape, and the heat radiating member can be formed by bending one metal plate. It is also possible to use two or more metal plates.

  The corrugated metal plate is, for example, a single metal plate, and a zigzag shape is formed between the connecting portion and the fin portion that is opposed to each other with a gap by combining a plurality of bendings of about 90 degrees. In addition, the connecting portions may be arranged substantially flush with each other through a gap. By bending the corrugated metal plate so that the entire shape becomes a cylindrical shape with the folding starting line aligned in the axial direction, the heat dissipation member can be obtained.

It is preferable that the inner peripheral side and the outer peripheral side coupling portions of the fin portions are formed of a plane or a curved surface arranged in the circumferential direction of the cylindrical shape.
In this case, a surface excellent in heat dissipation is formed on the fin portion arranged in the radial direction and the connecting portion arranged in the circumferential direction. Therefore, it becomes possible to promote heat dissipation in multiple directions.

Further, it is preferable that a through hole is formed in the connecting portion.
In this case, the air permeability of the cylindrical heat radiating member can be improved.
The connecting portion on the inner peripheral side constitutes the inner peripheral surface of the cylindrical heat radiating member, and the connecting portion on the outer peripheral side constitutes the outer peripheral surface of the cylindrical heat radiating member. By forming through-holes on these inner and outer peripheral surfaces as described above, the air permeability from the cylindrical side surface of the cylindrical heat radiating member is improved as described above, and the air cooling performance can be further improved. .

Specifically, the through hole is a hole that penetrates the metal plate constituting the heat dissipation member in the thickness direction. One or a plurality of through holes can be provided in each connecting portion. Preferably, through holes may be provided in all the outer peripheral connection portions and / or all the inner peripheral connection portions.
In addition, from the viewpoint of securing a heat dissipation surface in the connecting portion, even if a through hole is formed in the connecting portion, at least partially connect a portion composed of a planar or curved precoated aluminum alloy plate. It is preferable to leave it in the part.

The cylindrical heat dissipation member has a joint end at one end in the axial direction thereof. The heat radiating member is used by joining the joining end portion side to a heat generating member.
The cylindrical heat dissipating member can be directly joined to the heat generating member at one end in the axial direction thereof, but can also be joined to the heat generating member via, for example, a disk-shaped metal plate.

Preferably, a base plate made of a metal plate is joined to one end of the cylindrical heat dissipation member in the axial direction, and is used by being joined to the heat generating member via the base plate. 5).
In this case, since the contact area with the heat generating member increases due to the presence of the base plate, the heat radiating member can be joined to the heat generating member with good adhesion.
The cylindrical heat radiating member can be circulated in the market without the base plate, and the base plate can be joined at the time of use. However, the structure in which the base plate is joined to one end in the axial direction is used. Can also be distributed to the market. In other words, in the present specification, the heat radiating member is a concept including both those not including the base plate and those including the base plate.

The heat dissipating member can be used for heat dissipating heat generating members such as lighting fixtures or other electric devices.
Preferably, the heat dissipating member is for a downlight.
In this case, the characteristics of the heat dissipation member having a cylindrical shape and the above-described characteristic configuration can be sufficiently utilized.

Example 1
Next, the example applied to the downlight which is a kind of lighting fixture as an example of a heat radiating member is shown.
The heat radiating member 1 of this example is the state which aligned the bending origin line 11 to the axial direction X, as shown in FIGS. 1-4, the aluminum alloy board 10 bent along the some bending origin line 11 and made into the corrugated shape The overall shape is arranged so as to be a cylindrical shape. The cylindrical heat radiating member 1 has a joining end portion 12 at one end 115 in the axial direction X, and is used by joining the joining end portion 12 side to a heat generating member.

  The heat dissipating member 1 has a plurality of fin portions 13 arranged radially in a cylindrical radial direction. In the heat radiating member 1, the adjacent fin portions 13 are alternately connected to each other on the cylindrical inner peripheral side 101 and outer peripheral side 102. The connecting portions 14 and 15 on the inner peripheral side 101 and the outer peripheral side 102 of the fin portions 13 are formed by planes arranged in the circumferential direction of the cylindrical shape. The connecting portion 14 on the inner peripheral side 101 constitutes the inner peripheral surface of the cylindrical heat radiating member 1, and the connecting portion 15 on the outer peripheral side 102 constitutes the outer peripheral surface of the cylindrical heat radiating member 1. Hereinafter, the connecting portion on the inner peripheral side 101 will be referred to as the inner peripheral surface 14 and the connecting portion on the outer peripheral side 102 will be referred to as the outer peripheral surface 15 as appropriate.

As shown in FIG. 2, in this example, the interval between the adjacent fin portions 13 differs in the radial direction, and the interval increases from the inner peripheral side 101 toward the outer peripheral side 102. The interval between adjacent fin portions 13 is minimized on the inner peripheral side 101. In this example, the distances D3 and D4 on the inner peripheral side 101 are set to be the same regardless of whether the inner peripheral surface 14 that is the connecting portion on the inner peripheral side 101 is present or not. . That is, the intervals between the inner peripheral sides 101 of the fin portions 13 are all uniform and 5 mm.
Further, the interval between the outer peripheral sides 102 of the adjacent fin portions 13 is also uniform regardless of the presence or absence of the outer peripheral surface 15 that is the connecting portion of the outer peripheral side 102, and is set to 8 mm in this example. .
In addition, in this example, although the space | interval of the inner peripheral side 101 of the adjacent fin parts 13 and the space | interval of the outer peripheral side 102 are each made uniform, a space | interval can also be changed. From the viewpoint of heat dissipation, the shortest distance between adjacent fin portions 13 is preferably 3 mm or more.

  Further, as shown in FIGS. 1 and 3, through holes 140 and 150 that penetrate the aluminum alloy plate constituting the heat radiating member 1 in the thickness direction are formed in the connecting portions, that is, the flat inner peripheral surface 14 and the outer peripheral surface 15, respectively. Is formed. In this example, through holes 140 and 150 are provided in all inner peripheral surfaces 14 and outer peripheral surfaces 15. A through hole can be formed in the fin portion 13. In this example, the inner peripheral surface 14 is provided with two through holes 140a and 140b arranged in series in the axial direction X of the cylindrical shape. Similarly, two through holes 150 a and 150 b arranged in series in the axial direction X are also provided on the outer peripheral surface 15. Between the through holes 140a, 140b, 150a, 150b arranged in series, a portion made of an aluminum alloy plate is left.

In forming the heat radiating member 1 of this example, a material A1050-O material and a 0.5 mm thick aluminum alloy plate were prepared.
Next, as shown in FIG. 5, the aluminum alloy plates 10 are folded in a corrugated shape along a plurality of folding starting lines in a single state without overlapping the aluminum alloy plates 10. Specifically, the aluminum alloy plate 10 is repeatedly bent by about 90 degrees and formed into a corrugated shape, and the connecting portions 14 and 15 arranged in a substantially horizontal manner and the fin portion 13 provided upright from the connecting portions 14 and 15. And provided. Next, in the precoated aluminum alloy plate 10 bent into a corrugated shape, through holes 140 and 150 are formed in advance in portions that become the connecting portions 14 and 15 of the final shape (see FIGS. 1 to 3). Next, as shown in FIG. 6, the entire shape is bent into a cylindrical shape (diameter: 85 mm, height: 5 cm) with the folding starting line aligned in the axial direction X. At this time, the ends in the circumferential direction can be joined using an adhesive or the like. In this way, as shown in FIGS. 1 to 3, the cylindrical heat radiating member 1 can be formed. 5 and 6, the direction perpendicular to the paper surface is the forming direction of the bending origin line (axial direction X).
In the present example, as described above, the through hole is formed after being formed into a corrugated shape. However, after the through hole is formed in advance in a portion to be a connecting portion in the plate-like aluminum alloy plate It can also be formed into a corrugated shape.

  As shown in FIGS. 1 to 3, the cylindrical heat dissipating member 1 can be a joining end portion 12 for joining one end 115 in the axial direction X to the heat generating member. In the heat radiating member 1 of this example, a plate-like base member 81 (base plate 81) is joined to one end 115 in the axial direction X, and is joined to the heat generating member via the base member 81. The base member 81 is made of an aluminum alloy disk (diameter: 85 mm, thickness: 3 mm), and the base member 81 and the heat radiating member 1 can be joined with, for example, an adhesive.

  As a specific configuration in which the heat dissipating member 1 is applied to a downlight which is a type of lighting fixture, a configuration in which the heat dissipating member 1 is joined to a base plate 81 as shown in FIG. It is also possible to recognize the entire combination of the base member 81 and the heat dissipation member 1 as a heat dissipation member. In addition, in FIG. 7, the heat radiating member 1 arrange | positioned on the downlight main-body part 80 (heat generating member 80) shows the AA arrow cross section in FIG.

  Further, as shown in FIG. 7, a downlight main body 80 is prepared separately in which a substrate 83 on which a light source 82 made of LED elements is mounted and a reflector 84 for reflecting light emitted from the light source 82 in a desired direction are assembled. Keep it. Then, the base member 81 integrated with the heat radiating member 1 is disposed on the substrate 83 of the downlight main body portion 80 and joined via the insulating film 85. Thereby, the downlight 8 provided with the heat radiating member 1 is completed.

  When the downlight 803 is turned on, the light source 82 generates heat. This heat is transmitted to the heat radiating member 1 through the substrate 83, the insulating film 85, and the base member 81. In the heat radiating member 1, efficient heat radiation occurs due to the structure excellent in heat dissipation. Therefore, it is possible to prevent the temperature of the light source 82 in the downlight 803 from excessively rising, to prevent a reduction in life and to maintain the light emission performance.

  As shown in FIGS. 1 to 4, the heat dissipating member 1 of this example has a joining end portion 12 on one end side in the formation direction of the bending starting point line 11, and a corrugated aluminum alloy plate 10 is bent starting point. In a state where the lines 11 are aligned in the axial direction X, the entire shape is arranged in a cylindrical shape. Therefore, the surface area of the cylindrical side surface is increased, and the heat dissipation from the side surface can be improved. Moreover, since a space is formed inside the cylindrical heat radiating member 1, air cooling performance can be improved. The heat radiating member 1 is formed by bending a metal plate 10. Therefore, for example, weight reduction can be achieved compared with the heat radiating member which consists of a conventional forged product etc., for example.

  Moreover, in the heat radiating member 1, the connection parts 14 and 15 of the inner peripheral side 101 of the fin parts 13 and the outer peripheral side 102 are formed in the plane or curved surface arranged in the circumferential direction of the cylindrical shape, In FIG. 15, through holes 140 and 150 are formed. Therefore, the air permeability from the side surface of the cylindrical heat radiating member 1 can be improved. Therefore, excellent heat dissipation performance can be exhibited.

  In this example, the heat radiating member is formed using the aluminum alloy plate as described above. However, heat is radiated using a pre-coated aluminum alloy plate in which a resin layer having excellent heat radiating properties is formed on one side or both sides of the aluminum alloy plate. It is of course possible to form the member.

1 Heat dissipation member 10 Aluminum alloy plate (metal plate)
11 Bending origin line 12 Joining end 13 Fin 14 Connecting part (inner peripheral surface)
15 Connecting part (outer peripheral surface)
80 Downlight body (heating member)
81 Base member

Claims (6)

A heat dissipating member in which a metal plate bent along a plurality of bending origin lines and formed into a corrugated shape is arranged so that the overall shape becomes a cylindrical shape with the bending origin lines aligned in the axial direction,
The plurality of fin portions arranged radially in the radial direction of the cylindrical shape, and the adjacent fin portions are alternately connected on the inner peripheral side and the outer peripheral side of the cylindrical shape,
A heat radiating member having a joining end portion at one end in the axial direction of the cylindrical heat radiating member and joining the joining end portion side to a heat generating member.   The heat dissipating member according to claim 1, wherein the inner peripheral side and the outer peripheral side connecting portions of the fin portions are formed by a flat surface or a curved surface arranged in the circumferential direction of the cylindrical shape. Heat dissipation member.   The heat radiating member according to claim 2, wherein a through hole is formed in the connecting portion.   The heat radiating member according to any one of claims 1 to 3, wherein the metal plate is an aluminum alloy plate or a precoated aluminum alloy plate having a resin layer on at least one surface of the aluminum alloy plate. Heat dissipation member.   The heat radiating member according to any one of claims 1 to 4, wherein a base plate made of a metal plate is joined to one end of the cylindrical heat radiating member in the axial direction, and the base plate is interposed through the base plate. A heat radiating member used by being joined to a heat generating member.   The heat radiating member according to claim 1, wherein the heat radiating member is for downlight.

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