JP2012022817A - Heat radiation structure of lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently radiate heat generated by LED elements in a lighting fixture with the LED elements as a light source.SOLUTION: An LED support part 20 mounting the LED elements is attached to a radiator 10 fitted inside a body 5 of the lighting fixture 1 to arrange the LED elements at a given position inside the body 5. The radiator 10 has a radiating hole 13 penetrating inside the radiator 10 in an up-and-down direction, a lower end of which 13 is opened at an attachment part 14 of the LED support part 20. The LED support part 20 has a through-hole 25 provided communicating to the radiating hole 13. With this structure, when the radiator 10 is heated with heat of the LED elements 21, air inside the radiating hole 13 is also heated to cause upward convection inside the radiating hole 13 due to a chimney effect and to have outer air suctioned to the through-hole 25 communicated to the lower end of the radiating hole 13. As a result, the LED elements 21 attached to the LED support part 20 is efficiently cooled in contact with a suctioned air stream.

Description

  The present invention relates to a heat dissipation structure for a lighting fixture, and more particularly to a heat dissipation structure for a lighting fixture using an LED element as a light source.

  LED can be used as a light source for conventional lighting fixtures because it can obtain the same illuminance with lower power consumption than conventional incandescent bulbs and fluorescent lamps, and has a longer life than incandescent bulbs and fluorescent lamps. In place of incandescent bulbs and fluorescent lamps that have been used, lighting fixtures using LEDs as light sources are also becoming popular.

  However, while high-power LEDs for illumination generate high heat, LED elements that are semiconductors are vulnerable to heat, so if the heat generated by the LED elements is not properly treated, they are listed as LED characteristics. The long-life characteristic can be lost.

  Therefore, in lighting fixtures using LED elements as light sources, heat countermeasures are taken to protect the LED elements from heat.

  As an example of such heat countermeasures, it is possible to suppress the thermal effect between multiple LEDs, promote air convection, reduce the total heat generation, and drive the LEDs at higher output. In addition, in order to make it possible to arrange the LEDs densely, measures such as providing notches or holes in the space between the LEDs of the mounting substrate on which the LEDs are mounted are also taken (see Patent Document 1). .

JP 2006-179443 A

  However, in the mounting substrate introduced as Patent Document 1, although the influence of heat between the LED elements can be cut off to some extent, the heat dissipation performance itself cannot be greatly improved.

  Therefore, the present invention provides a heat dissipation structure that can dissipate heat more efficiently in a lighting fixture that uses an LED element as a light source, thereby appropriately protecting the LED element used as the light source of the lighting fixture from heat. Objective.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This symbol is intended to clarify the correspondence between the description of the claims and the description of the mode for carrying out the invention. Needless to say, it is used for the interpretation of the technical scope of the claims of the present invention. It is not used restrictively.

In order to achieve the above object, the heat dissipation structure of the lighting fixture 1 of the present invention includes an LED support portion 20 to which an LED substrate 22 including an LED element 21 is attached,
A radiator that is attached to the body 5 of the lighting fixture 1 and that is provided with the LED support portion 20 and that disposes the LED support portion 20 provided on the attachment portion 14 at a predetermined position in the body 5. 10
The heat radiating body 10 is provided with a heat radiating hole 13 that penetrates the heat radiating body 10 and opens the lower end at the mounting portion 14, and the LED support portion 20 is provided with a through hole 25 that communicates with the heat radiating hole 13. (Claim 1).

  In the heat dissipating structure, it is preferable that heat dissipating fins 15 and 16 are provided on the outer periphery of the heat dissipating body 10 (Claim 2).

  The LED support portion 20 can be used as the attachment portion 14, and the LED substrate 22 including the LED element 21 can be directly disposed thereon.

  The LED board 22 having the LED element 21 on one surface and the support plate 23 formed of a high thermal conductivity material provided on the other surface of the LED board 22 can be configured. ; See FIG.

  Furthermore, in the heat dissipation structure including the support plate 23, it is preferable that the LED support portion 20 is detachably attached to the heat radiating body 10.

Further, the heat radiating body 10 is constituted by a first portion 11 provided with the mounting portion 14 and a second portion 12 fixed to the body 5 (see FIGS. 3, 5 and 6),
One of the first part 11 and the second part 12 (first part 11 in the embodiment) is provided with a columnar portion 17 in which a hollow space constituting at least a part of the heat radiation hole 13 is formed, and the other (implemented). In the embodiment, an insertion hole 18 into which the columnar portion 17 can be inserted is formed in the second portion 12), and the insertion length of the columnar portion 17 with respect to the insertion hole 18 is variable, so that the heat dissipation portion extends in the longitudinal direction of the heat dissipation hole 13. The length of 10 can be made variable (claim 5).

  Further, at a position separated from the mounting position of the heat radiating body 10 with respect to the body 5, for example, at the lower end side of the heat radiating body 10, it contacts both the heat radiating body 10 and the body 5 and between the heat radiating body 10 and the body 5. It is also possible to provide a heat dissipation adapter 40 that generates heat conduction.

  With the configuration of the present invention described above, the following remarkable effects can be obtained in the lighting fixture 1 having the heat dissipation structure of the present invention.

  By providing the through hole 25 provided in the LED support portion 20 and the heat dissipation hole 13 communicating with the through hole 25 in the heat dissipation body 10 to which the LED support portion 20 is attached, the heat generated by the LED element 21 is generated by the heat dissipation body 10. In addition to being dissipated and dissipated, the air in the heat radiation hole 13 is heated by the heat generated by the LED element 21, and as a result, the interior of the heat radiation hole 13 rises as indicated by arrow A in FIG. Air convection occurs.

  As a result, the lower end portion of the heat radiation hole 13 becomes negative pressure, and the surrounding air is sucked into the heat radiation hole 13 through the through hole 25 provided in the LED support portion 20 that communicates with the negative pressure, and is attached to the LED support portion 20. The LED element 21 can be radiated by being brought into contact with cooling air (arrow B in FIG. 1) that is an air flow toward the through hole 25, so that the LED element 21 can be efficiently cooled. It was.

  As a result, by reliably cooling the LED element 21 that is relatively heat-sensitive, it has been possible to suitably prevent a reduction in the life due to the LED element 21 being destroyed by heat.

  With the configuration in which the radiation fins 15 and 16 are provided on the outer periphery of the radiator 10 described above, the heat of the LED element 21 thermally conducted to the radiator 10 can be radiated more efficiently.

  Furthermore, the LED support portion 20 described above is constituted by the LED substrate 22 and a support plate 23 (for example, an aluminum plate) formed of a highly heat-conductive material attached to the LED substrate 22, so that the heat of the LED element 21 can be increased. It was able to be suitably transmitted to the radiator 10.

  In the configuration in which the LED support portion 20 is detachably attached to the radiator 10, even when the LED element 21 is damaged or the like, the lighting fixture 1 is attached to the ceiling or the like, for example It was possible to easily replace only the light source part.

  Further, in the configuration in which the radiator 10 is formed by a combination of the first portion 11 and the second portion 12 and the length of the radiator 10 is variable in the longitudinal direction of the radiator hole 13, The position of the mounting portion 14 in the body 5, and thus the position of the LED element 21 could be made variable.

  As a result, the arrangement of the LED elements (light sources) with respect to the reflector 31 attached to the body 5 can be finely adjusted by the expansion and contraction of the radiator 10.

  In the configuration in which the heat dissipating adapter 40 that contacts between the heat dissipating body 10 and the body 5 is provided at a position apart from the mounting position of the heat dissipating body 10 with respect to the body 5, 5 can absorb heat more efficiently, and as a result, the influence of heat on the LED element 21 can be more reliably eliminated.

The principal part cross-sectional side view of the lighting fixture provided with the thermal radiation structure of this invention. The principal part cross-section exploded side view of the lighting fixture provided with the thermal radiation structure of this invention. The principal part cross-section exploded side view of the lighting fixture provided with the thermal radiation structure of this invention. (A) of a LED support part is a top view, (B) is a side view, (C) is a bottom view. (A) of a radiator is a plan view of the second part, (B) is a side view of the second part, (C) is a plan view of the first part, and (D) is a side view of the first part. The exploded sectional view of a radiator. The expanded sectional view of the upper end part of a radiator. (A) of the heat dissipation adapter is a plan view, and (B) is a side view.

  Next, the lighting fixture provided with the heat dissipation structure of this invention is demonstrated, referring an accompanying drawing.

[Overall structure of lighting equipment]
1 to 3 are examples in which the heat dissipation structure of the present invention is applied to a downlight as an example of a lighting fixture 1.

  In the illustrated embodiment, the luminaire 1 includes a body 5 constituting a main body portion of the luminaire 1, a radiator 10 attached to the body 5, and an LED support portion 20 attached to the radiator 10. And an optical unit 30 including a reflector 31, a lens and / or filter 32, a cone 33 and the like attached to the lower end opening 5a (see FIGS. 2 and 3) of the body 5 (see FIGS. 1 and 2). reference).

  As shown in FIG. 1, the lighting fixture 1 is fitted with a holding frame 7 for mounting a lighting fixture in an opening 6 a formed in, for example, a ceiling plate 6, and the inside of the holding frame 7 from the indoor side. When the lighting fixture 1 is inserted toward the back side of the ceiling, the cone 33 of the inserted lighting fixture 1 is locked in the holding frame 7 so that the lighting fixture 1 can be attached to the ceiling plate. Yes.

  The body 5 described above is formed in a generally inverted cup shape as a whole, and has a lower end opening 5a for attaching the optical unit 30 to the lower end as shown in FIG. An upper end opening 5b into which a part of the radiator 10 is inserted is formed.

  The body 5 has an air circulation port 5c formed by partially removing a side surface in order to suitably introduce outside air into the body 5 and discharge the air inside the body to the outside. It is preferable to improve the cooling efficiency.

[Heat dissipation structure]
In the lighting fixture 1 configured as described above, the heat dissipation structure of the present invention is provided as needed, the LED support 20 on which the LED elements 21 are disposed, the heat sink 10 to which the LED support 20 is attached, and as necessary. This is realized by the heat dissipation adapter 40.

LED support portion The LED support portion 20 described above has a plate shape as a whole with an LED element attached to one surface, and in the illustrated embodiment, the LED element 21 is attached to one surface of a resin substrate. The LED board 22 formed in this manner has a structure in which it is attached to a support plate 23 made of aluminum, copper, or other material having good thermal conductivity (in this embodiment, aluminum) (see FIG. 4).

  As shown in FIG. 4 (B), a socket 24 is attached to the LED element 21 provided in the LED support portion 20 via a wiring 27, and the LED element 21 is connected to a control device (not shown). Is turned on and off, and the brightness and the like can be controlled as necessary.

  The LED support portion 20 is provided with a through hole 25 at a position where the LED element 21 is not disposed, in the illustrated embodiment, at the center position thereof. When attached, the through hole 25 can be communicated with the heat dissipating hole 13 penetrating the heat dissipating body 10.

  In addition, it is also possible to arrange | position the LED board 22 provided with the LED element 21 directly on this LED support part 20 as the attachment part 14 mentioned later.

Heat Dissipator The LED support unit 20 configured as described above is configured to be attached to a predetermined position in the body 5 described above by being attached to the heat radiator 10.

  As shown in FIGS. 1 and 2, the heat dissipating body 10 is inserted into the upper end opening 5b of the body 5 and fixed to the body 5 as shown in FIGS. The mounting portion 14 to be provided is formed as a flat surface in the illustrated embodiment so that the LED support portion 20 described above can be attached to the mounting portion 14 by, for example, screwing. It is configured.

  In the heat radiating body 10, a heat radiating hole 13 whose lower end is opened by the mounting portion 14 is formed so as to penetrate the heat radiating body 10 in the vertical direction, and a spiral hole 26 formed in the LED support portion 20. When a spiral hole (not shown) provided in the mounting portion 14 is aligned, and a spiral is inserted into and screwed into both the spiral holes, the through hole 25 formed in the LED support portion 20 is connected to the heat dissipation hole 13. It is configured so that it can be attached in communication with the lower end.

  A plurality of radiating fins 15 whose longitudinal direction (vertical direction) is the longitudinal direction is formed on the outer periphery of the radiating body 10, and by increasing the surface area by the radiating fins 15, the heat dissipation is improved. .

  In addition, heat radiation fins 16 extending in the outer peripheral direction are provided at portions that protrude upward from the upper end opening 5b of the body 5 and are arranged outside the body 5, so as to improve heat radiation efficiency.

  The heat dissipating body 10 configured as described above may be integrally formed as a whole, but in the present embodiment, the heat dissipating body 10 is connected to the first portion 11 and the second portion 12. It is configured to be separable into two components.

  A columnar part (cylindrical part in the illustrated example) 17 in which a hollow space constituting at least a part of the heat radiating hole 13 is provided in one of the first and second parts 11 and 12, and the other is provided. The insertion hole 18 into which the columnar part 17 can be fitted is formed, and the columnar part 17 has a structure similar to the telescopic structure in which the columnar part 17 is inserted into the insertion hole 18. By changing the length, the length of the heat radiating body 10 in the longitudinal direction of the heat radiating hole 13 is variable.

  In the illustrated embodiment, the cylindrical portion 17, which is the aforementioned columnar portion, is provided on the opposite side (upper end side) of the first portion 11 from the attachment portion 14, and the second portion attached to the upper end opening 5 b of the body 5. The portion 12 is provided with an insertion hole 18 into which the cylindrical portion 17 is inserted, and the cylindrical portion 17 can be fixed in a state where the cylindrical portion 17 is inserted into the insertion hole 18. By adjusting the insertion length of the portion 17, the entire length of the radiator 10 can be made variable in the length direction of the radiator hole 13.

  In the illustrated embodiment, the columnar portion 17 described above is formed in a cylindrical shape and the insertion hole 18 is formed in a shape corresponding to this, but the shape of the columnar portion 17 is not illustrated. For example, it may be configured as a prismatic shape, or may have a structure similar to a spline by providing a key or groove on the outer periphery.

  The second portion 12 of the radiator 10 configured as described above has a fitting portion 19 inserted and fitted into the upper end opening 5b of the body 5 and a peripheral edge on the upper end side of the fitting portion 19. A heat dissipating fin 16 extending in the outer peripheral direction is provided, and when the fitting portion 19 provided in the second portion 12 is inserted downward into the upper end opening 5b of the body 5, the heat dissipating fin 16 is formed on the periphery of the upper end opening 5b. Is locked so that the second portion 12 can be fixed at a predetermined position of the body 5 (see FIG. 2).

  Then, the first portion 11 is attached to a predetermined position in the body 5 by inserting and fixing the cylindrical portion 17 of the first portion 11 upward in the insertion hole 18 provided in the second portion 12. Can be done.

  As shown in FIGS. 5A, 5 </ b> C, and 7, the fixing between the first portion 11 and the second portion 12 is, for example, a flange portion 12 a that protrudes inward from the upper end opening edge of the second portion 12. The tip of the spiral 81 inserted or fitted into the through hole or notch (notched in the example shown in the figure) 12d (see FIG. 5A) is provided at the upper end of the cylindrical portion 17 of the first portion 11. This is done by screwing into the hole 17a and tightening.

  In the present embodiment, in addition to the above-described notch 12d for inserting the fixing helix 81, a spiral hole 12b for screwing the helix 82 is formed in the tongue 12c protruding from the flange portion 12a. The insertion length of the cylindrical portion 17 of the first member 11 with respect to the insertion hole 18 provided in the second member 12 is adjusted by screwing the spiral hole 12b and adjusting the protruding length of the leading end of the spiral 82 that has passed through. To be able to.

  As a result, by tightening the spiral 81 while adjusting the protruding length of the spiral 82, it is possible to finely adjust the overall length of the radiator, and to fix both at the adjusted position. It has become.

  In this way, by finely adjusting the overall length of the radiator 10, the mounting portion 14 located at the lower end of the radiator 10, and thus the LED support portion 20 provided in the mounting portion 14 in the body 5 of the LED element 21. The arrangement can be fine-tuned to achieve the optimum arrangement.

Heat Dissipation Adapter Note that the heat dissipation adapter 40 shown in FIGS. 8A and 8B can be attached to the heat radiator 10 described above.

  The heat radiating adapter 40 is provided to further improve the heat radiating property of the heat radiating body 10 by conducting the heat of the heat radiating body 10 to the body 5, and is in contact with both the heat radiating body 10 and the body 5. The shape, material, structure, etc. are not particularly limited as long as they exhibit the heat transfer action described above, and in the present embodiment, they are formed separately from the heat radiator 10 described above. It may be formed integrally with the body 10.

  In the present embodiment, the heat radiating adapter 40 is manufactured by processing a plate formed of a highly heat conductive material (aluminum in the present embodiment) such as aluminum or copper. Is provided with an opening 41 having a sawtooth piece 42 fitted between the radiating fins 15 formed in the first portion of the radiator at the inner peripheral edge, and protrudes in the outer circumferential direction from the outer peripheral edge of the plate body. When the first part 11 of the radiator 10 inserted into the opening 41 of the heat dissipation adapter 40 is attached to the second part 12 fixed to the body 5, the contact piece 43 of the heat dissipation adapter 40 becomes a body. 5 is brought into contact with a rib or the like provided on the inner wall (see FIG. 2), whereby the heat of the radiator 10 can be rescued to the body 5 to improve the heat dissipation.

[Action etc.]
In the lighting fixture 1 having the heat dissipation structure of the present invention configured as described above, when the LED element 21 attached to the LED support portion 20 is caused to emit light and turn on, the heat generated in the LED element 21 is transferred to the radiator 10. Heat is transferred to dissipate heat by heat exchange by contact between the heat dissipating fins 15 and 16 provided on the heat dissipating body 10 and the surrounding air.

  Thus, when heat is transmitted to the radiator 10, the air in the radiator hole 13 provided in the vertical direction through the radiator 10 is warmed in the radiator 10, and as a result, the chimney effect enters the radiator hole 13. As shown by arrow A in FIG. 1, heat convection is generated in which air flows upward.

  As a result of this heat convection, the lower end side of the heat radiation hole 13 becomes negative pressure, and the outside air is sucked into the heat radiation hole 13 through the through hole 25 provided in the LED support portion 20 as indicated by an arrow B in FIG. The cooling efficiency of the LED element 21 is further improved by the outside air sucked into the through hole 25 being applied as cooling air to the LED element 21 of the LED substrate 22 attached around the through hole 25. It has become something that can be made.

  In addition, in the lighting fixture 1 provided with the heat dissipation structure having the above-described configuration, the LED support portion 20 can be attached to and detached from the heat dissipator 10 even if the LED element 21 is damaged. Is removed together with the LED support portion 20, and can be easily attached and detached, exchanged, and the like.

  That is, when the LED support part 20 is detachably attached to the radiator 10, the entire lighting fixture 1 is replaced when the LED element 21 is damaged, or at least the first part of the radiator 10 is replaced. Replace with 1 part 11. In either case, it is necessary to remove the entire luminaire 1 from the ceiling plate 6 once.

  However, in the case of the above configuration, the lighting fixture 1 is attached to the ceiling plate 6 and the spiral that fixes the LED support 20 to the radiator 10 is removed from the indoor side. It can be removed by simple work, and the workability during replacement work can be greatly improved.

  In addition, in the structure which formed the heat radiator 10 by the combination of the 1st part 11 and the 2nd part 12, the full length of the heat radiator 10 can be made variable in the longitudinal direction of the heat radiation hole 13 as mentioned above. It has become a thing.

  As a result, it is possible to finely adjust the arrangement of the LED support portion 20 attached to the radiator 10 and thus the LED element 21 as the light source in the body 5, and thereby the relative position between the reflector 31 and the LED element 21. By changing the relationship, it is possible to adjust the irradiation range of light emitted from the lighting fixture to an optimum state.

  In the above description, the case where the heat dissipation structure of the present invention is applied to a downlight has been described as an example. However, the lighting fixture to which the heat dissipation structure of the present invention is applied is not limited to a downlight, but is a spotlight, a wall washer. It can be used for various lighting fixtures such as pendant lights, and is not limited to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 5 Body 5a Lower end opening 5b Upper end opening 5c Air distribution port 6 Ceiling board 6a Opening 7 Holding frame 10 Radiator 11 First part (of radiator)
12 Second part (of the radiator)
12a Flange portion 12b Spiral hole 12c Tongue piece 12d Notch 13 Radiation hole 14 Mounting portion 15, 16 Radiation fin 17 Cylindrical portion (columnar portion)
17a Spiral hole 18 Insertion hole 19 Fitting part 20 LED support part (attachment part 14)
DESCRIPTION OF SYMBOLS 21 LED element 22 LED board 23 Support plate 24 Socket 25 Through-hole 26 Spiral hole 27 Wiring 30 Optical unit 31 Reflector 32 Lens and / or filter 33 Cone 40 Heat radiation adapter 41 Opening 42 Sawtooth piece 43 Contact piece 81, 82 Spiral

Claims (6)

An LED support with LED elements attached thereto;
A heat sink that is attached to a body of a lighting fixture and includes an attachment portion on which the LED support portion is provided, and that disposes the LED support portion attached to the attachment portion at a predetermined position in the body;
The heat radiating body includes a heat radiating hole that penetrates the heat radiating body and opens a lower end at the mounting portion, and the LED support portion is provided with a through hole that communicates with the heat radiating hole. Equipment heat dissipation structure.   The heat dissipation structure for a lighting fixture according to claim 1, wherein a heat dissipation fin is provided on an outer periphery of the heat dissipation body.   The LED support portion is constituted by an LED substrate having an LED element attached to one surface thereof, and a support plate formed of a high thermal conductivity material attached to the other surface of the LED substrate. The heat dissipation structure for a lighting fixture according to claim 1 or 2.   4. The heat dissipation structure for a lighting fixture according to claim 3, wherein the LED support portion is detachably attached to the heat dissipation body. The radiator is composed of a first part having the mounting portion and a second part fixed to the body;
A columnar part in which a hollow space constituting at least a part of the heat radiating hole is formed in either one of the first part or the second part, and an insertion hole into which the columnar part can be inserted is formed in the other part, 5. The lighting device according to claim 1, wherein an insertion length of the columnar portion with respect to the insertion hole is variable, and a length of the heat dissipation portion is variable in a longitudinal direction of the heat dissipation hole. Heat dissipation structure.   A heat dissipating adapter is provided that is in contact with both the heat dissipating body and the body and generates heat conduction between the heat dissipating body and the body at a position apart from the mounting position of the heat dissipating body with respect to the body. The heat dissipation structure for a lighting fixture according to any one of claims 1 to 5.

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