JP5685767B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device, and particularly to a lighting device including an LED light source.

  For example, mercury lamps have been often used as light sources for lighting devices in streets, stadiums, and gymnasiums. Recently, instead of mercury lamps, LED light sources that have higher luminous efficiency and longer life than mercury lamps have begun to be used. Yes. An LED light source used as an alternative to a mercury lamp or the like is a high-output type including a large number of LEDs, and generates a large amount of heat during lighting. Therefore, in a lighting device including a high-output type LED light source, it is indispensable to take measures against heat such as providing a heat sink for radiating heat from the LED light source.

  Various configurations for countermeasures against this heat have been proposed.

  For example, in the configuration proposed in Patent Document 1 (Japanese Patent Laid-Open No. 2012-221697), an aluminum base plate and a cover plate facing the lower surface of the base plate with a gap are provided. On the lower surface of the base plate, a plurality of LEDs and heat dissipation plates are alternately arranged in the circumferential direction. An air inlet is formed in the center of the base plate, and an exhaust duct communicating with the air inlet is provided on the upper surface of the base plate. An exhaust fan is disposed at the tip of the exhaust duct. When this exhaust fan is driven, air flows from the periphery of the cover plate between the base plate and the cover plate, and the air is discharged through the exhaust duct. . When air flows between the base plate and the cover plate, the heat of the base plate and the heat radiating plate is taken away by the air, and the base plate and the heat radiating plate are cooled.

  In the configuration proposed in Patent Document 2 (Japanese Patent Laid-Open No. 2012-238394), the LED substrate is disposed below the heat sink, and the air blower is disposed above the heat sink. In the peripheral part of the heat sink, an intake port and an exhaust port are formed on opposite sides of the air blower. A partition plate is provided between the air inlet and the blower. The blower device has an exhaust surface facing the heat sink and an intake surface provided on the opposite surface. When the air blower is driven, air flows into the air blower from the intake port, and the air flows around the upper side of the partition plate. Then, the air flows from the intake surface to the exhaust surface of the blower, hits the heat sink, and is discharged from the discharge port. When the air hits the heat sink, the heat of the heat sink is taken away by the air, and the heat sink is cooled.

JP 2012-221697 A JP 2012-238394 A

  However, in any of the configurations according to the proposals, the number of fans (blowers) is one and the amount of air generated by the fans is small, so that the LED light source cannot be sufficiently cooled. In order to increase the air volume for cooling the LED light source (heat sink), it is conceivable to mount a plurality of fans. In that case, the flow of air (wind) by each fan must be considered.

  The present invention has been made under such a background, and an object thereof is to provide an illumination device capable of effectively cooling a light source.

  In order to achieve the above object, a lighting device according to the present invention includes a case having a peripheral wall, an air inlet formed in the peripheral wall, and an exhaust formed in a position facing the air inlet in the peripheral wall in a predetermined direction. An opening, a light source provided in the case, a heat sink disposed between the intake port and the exhaust port and contacting the light source from a side opposite to a light projecting side from the light source, and the case An air intake fan that is disposed in the case facing the intake port in the predetermined direction and that sucks air into the case through the air intake port, and that faces the exhaust port in the predetermined direction in the case. An exhaust fan for exhausting air from the case through the exhaust port, and the intake fan on both sides of the case in a direction perpendicular to the predetermined direction with respect to the heat sink. And a space between the exhaust fan is provided so as to partition the space disposed partition wall is location.

  According to this configuration, the air inlet and the air outlet are formed at positions facing each other in a predetermined direction on the peripheral wall of the case that houses the light source. In the case, a heat sink is provided in contact with the light source from the side opposite to the light projecting side between the air inlet and the air outlet. In addition, an intake fan and an exhaust fan are disposed in the case at positions facing the intake port and the exhaust port in a predetermined direction, respectively. In the case, partition walls are provided on both sides of the heat sink in a direction perpendicular to the predetermined direction so as to partition the space on the intake fan side and the space on the exhaust fan side.

  When the intake fan and the exhaust fan are driven, air flows into the case from the outside through the intake port due to the action of the intake fan, and the air flows in a predetermined direction toward the heat sink. When the air hits the heat sink, the heat of the heat sink is taken away by the air, the heat sink is cooled, and consequently, the light source in contact with the heat sink is cooled. Since the partition walls are provided on both sides of the direction perpendicular to the predetermined direction with respect to the heat sink, the air flowing from the intake fan toward the heat sink passes between the partition walls and enters the space where the exhaust fan is arranged. Inflow. By the action of the exhaust fan, the air passing between the partition walls is sent toward the exhaust port, and the air is discharged to the outside through the exhaust port.

  As a result of research by the inventors of the present application, in a configuration in which no partition wall is provided, a part of the air hitting the heat sink flows to the side of the exhaust fan, and the air flows along the inner peripheral surface of the case. Since it flows to the suction side, it turned out that the air which took heat from the heat sink circulates in the case, and the exchange of the air in the case and the outside air is not performed well. By providing the partition wall, the air hitting the heat sink can be prevented from flowing to the side of the exhaust fan, and the air hitting the heat sink can be sucked into the exhaust fan well. It is possible to prevent the air deprived from circulating. As a result, the air in the case and the outside air can be favorably interchanged, and the light source can be satisfactorily cooled via the heat sink by the low temperature outside air.

  The heat sink includes a first heat exchange unit disposed on the inlet side with respect to the partition wall, a second heat exchange unit disposed on the exhaust port side with respect to the partition wall, the first heat exchange unit, and the second heat. The exchange part may be provided with a erection part that is installed so as to be able to transfer heat and that contacts the light source. In that case, it is preferable that a blower fan for blowing air from the first heat exchange unit toward the second heat exchange unit is provided between the first heat exchange unit and the second heat exchange unit.

  By providing the blower fan, a flow of air from the intake fan to the exhaust fan is forcibly formed, so that a part of the air hitting the first heat exchange part of the heat sink flows to the side of the exhaust fan. Can be further prevented.

  In that case, it is preferable that the partition wall penetrates between the first heat exchange part and the second heat exchange part. According to this structure, since the clearance gap between a ventilation fan and a partition wall can be made small, it can prevent that the air which contacted the 1st heat exchange part escapes to the side of a ventilation fan through the clearance gap. As a result, the air hitting the first heat exchange part can be sucked into the blower fan and sent from the blower fan toward the exhaust fan, and the second heat exchange part is cooled well by the air. Can do. Therefore, the light source can be cooled more favorably through the heat sink.

  The peripheral wall of the case may have a cylindrical inner peripheral surface. In this case, it is preferable that the partition wall is erected on the inner peripheral surface.

  When the inner peripheral surface of the case's peripheral wall is cylindrical, air that flows to the side of the exhaust fan without being sucked into the exhaust fan tends to flow along the inner peripheral surface to the air suction side of the intake fan. Can be prevented from forming an air flow along the inner peripheral surface.

  According to the present invention, by providing the partition wall, the air hitting the heat sink can be prevented from flowing to the side of the exhaust fan, and the air hitting the heat sink can be satisfactorily sucked into the exhaust fan. It is possible to prevent the air deprived of heat from the heat sink from circulating in the case. As a result, the air in the case and the outside air can be favorably interchanged, and the light source can be satisfactorily cooled via the heat sink by the low temperature outside air.

It is a side view of the illuminating device which concerns on one Embodiment of this invention. It is sectional drawing of the illuminating device in cut surface line AA shown by FIG. It is sectional drawing which shows the structure of the illuminating device which this inventor made as an experiment before reaching this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a side view of a lighting device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the illumination device taken along a cutting plane line AA shown in FIG.

  The lighting device 1 can be widely used for lighting in streets, stadiums, night construction sites, factories, gymnasiums, and the like. The lighting device 1 includes a case 11, a cooling mechanism 12, an LED light source 13, and a transmission plate 14.

  The case 11 is made of a metal having excellent corrosion resistance such as aluminum. The case 11 has a substantially bottomed cylindrical shape having a bottom wall 15 and a peripheral wall 16 rising from the periphery of the bottom wall 15.

  In the following description, the vertical direction of the lighting device 1 is defined with the open end surface side of the case 11 as the upper side and the opposite side as the lower side.

  A plurality of intake ports 17 and exhaust ports 18 are formed in the peripheral wall 16. The intake port 17 is divided into two upper and lower stages, and is arranged in parallel at intervals in the circumferential direction of the peripheral wall 16 at each stage. The exhaust port 18 is divided into two upper and lower stages at a position facing the intake port 17 in the predetermined direction D1, and is arranged in parallel at intervals in the circumferential direction of the peripheral wall 16 at each stage. The same number of intake ports 17 and exhaust ports 18 are provided, for example, and have a rotationally symmetric configuration about the central axis of the case 11.

  The cooling mechanism 12 is disposed on the bottom wall 15 and is accommodated in the case 11. The cooling mechanism 12 includes a heat sink 19, an intake fan 20, an exhaust fan 21, and a blower fan 22.

  The heat sink 19 is made of a metal having excellent thermal conductivity such as aluminum. The heat sink 19 includes a first heat exchanging unit 23, a second heat exchanging unit 24, and an erection unit 25.

  The 1st heat exchange part 23 is arrange | positioned facing the inlet port 17 and the predetermined direction D1. The first heat exchanging portion 23 has a configuration in which a plurality of (for example, 56) radiating fins 26 are stacked at intervals in the vertical direction. The first heat exchanging portion 23 is formed with a concave portion 27 that is recessed in the predetermined direction D1 from the intake port 17 side by notching each radiating fin 26 in a substantially rectangular shape in plan view.

  The second heat exchanging part 24 is arranged to face the first heat exchanging part 23 with a space in the predetermined direction D1 and to face the exhaust port 18 in the predetermined direction D1. The second heat exchange unit 24 has a configuration in which a plurality of (for example, 56) radiating fins 28 are stacked with an interval in the vertical direction. The second heat exchanging portion 24 is formed with a concave portion 29 that is recessed from the exhaust port 18 side in a predetermined direction D1 by notching each radiating fin 28 in a substantially rectangular shape in plan view.

  The erection unit 25 includes a plurality of (for example, six) heat pipes 30. Each heat pipe 30 is installed between the first heat exchange unit 23 and the second heat exchange unit 24. Specifically, one end of each heat pipe 30 is connected to the first heat exchange unit 23, extends above the first heat exchange unit 23, bends and extends in a predetermined direction D <b> 1, and the second heat exchange unit 24. The other end portion is connected to the second heat exchanging portion 24 by being bent downward and extending upward. The portions of each heat pipe 30 extending in the predetermined direction D1 gather in an orthogonal direction D2 orthogonal to the predetermined direction D1 to form a contact portion 31 with the LED light source 13.

  The intake fan 20 is disposed in the recess 27 of the first heat exchange unit 23 such that the rotation axis extends in the predetermined direction D1. The intake fan 20 is supplied with operating power from a power supply unit (not shown).

  The exhaust fan 21 is disposed in the recess 29 of the second heat exchange unit 24 so that the rotation axis extends in the predetermined direction D1. The exhaust fan 21 is supplied with operating power from a power supply unit (not shown).

  The blower fan 22 is disposed between the first heat exchange unit 23 and the second heat exchange unit 24 so that the rotation axis extends in the predetermined direction D1. The rotation axes of the intake fan 20, the exhaust fan 21, and the blower fan 22 are aligned on the same straight line. The blower fan 22 is supplied with operating power from a power supply unit (not shown).

  The LED light source 13 includes a substrate on which a plurality of LEDs are mounted on the uppermost portion, and the lower surface of the substrate is disposed so as to contact the contact portion 29 of the heat sink 19 from above. The LED light source 13 is supplied with operating power from a power supply unit (not shown). The brightness of the LED light source 13 is, for example, 4000 lm to 16000 lm.

  The transmission plate 14 is made of, for example, a transparent or translucent resin having a light transmission property, and has a disk shape having the same diameter as the outer diameter of the case 11. The transmission plate 14 is disposed so as to close the open end surface of the case 11 from above, and is fixed to the case 11.

  A partition wall 33 extending up and down is provided on the inner peripheral surface 32 of the case 11 on both sides of the heat sink 19 in the orthogonal direction D2. Each partition wall 33 protrudes in the orthogonal direction D2 from the inner peripheral surface 32, and its front end part enters between the first heat exchange part 23 and the second heat exchange part 24 of the heat sink 19 and is orthogonal to the blower fan 22. Opposite the direction D2 with a gap. A space around the heat sink 19 in the case 11 is partitioned by a partition wall 33 into a space in which the intake fan 20 is disposed and a space in which the exhaust fan 21 is disposed.

  When power is turned on and operating power is supplied to the LED light source 13, each LED emits light, and the light is emitted to the outside through the transmission plate 14. When the power is turned on, operating power is supplied to the intake fan 20, the exhaust fan 21, and the blower fan 22, and the intake fan 20, the exhaust fan 21, and the blower fan 22 are driven.

  Due to the action of the intake fan 20, air flows from the outside into the case 11 through the intake port 17, and the air flows between the radiation fins 26 of the first heat exchanging portion 23 of the heat sink 19 along the predetermined direction D <b> 1. When air passes between the radiating fins 26, heat exchange is performed between the radiating fins 26 and the air, and the radiating fins 26 are cooled.

  Due to the action of the blower fan 22, the air traveling from the first heat exchange unit 23 toward the second heat exchange unit 24 along the predetermined direction D <b> 1 between the first heat exchange unit 23 and the second heat exchange unit 24 of the heat sink 19. Is formed. In addition, partition walls 33 are provided on both sides of the blower fan 22 in the orthogonal direction D2. Therefore, the air passing between the radiation fins 26 of the first heat exchange part 23 passes between the partition walls 33 and flows into the space on the side where the second heat exchange part 24 and the exhaust fan 21 are arranged. To do.

  Due to the action of the exhaust fan 21, the air passing between the partition walls 33 flows between the radiating fins 28 of the second heat exchanging part 24 toward the exhaust port 18 along the predetermined direction D <b> 1 and passes through the exhaust port 18. It is discharged outside. When air passes between the radiating fins 28, heat exchange is performed between the radiating fins 28 and the air, and the radiating fins 28 are cooled.

  In the heat sink 19, the heat radiation fins 26 of the first heat exchange unit 23 and the heat radiation fins 28 of the second heat exchange unit 24 are air-cooled, so that heat generated from the LED light source 13 is transmitted through the installation unit 25 to the first heat exchange unit. 23 and the second heat exchanging unit 24. As a result, the LED light source 13 is cooled.

  FIG. 3 is a cross-sectional view showing the configuration of the lighting device that the inventor of the present application prototyped before reaching the present invention. In FIG. 3, parts corresponding to the respective parts shown in FIG. 2 are denoted by the same reference numerals as those of the respective parts. Below, the description of the part to which the same reference symbol is attached is omitted.

  The inventor of the present application prototyped the illumination device 101 having the configuration shown in FIG. 3 in the process leading to the present invention. The lighting device 101 differs from the lighting device 1 shown in FIG. 2 in that the blower fan 22 and the partition wall 33 are omitted.

  In the illuminating device 101, the LED light source 13 was turned on and the intake fan 20 and the exhaust fan 21 were driven to test the temperature rise of the LED light source 13. As a result, it has been found that the temperature of the LED light source 13 rises to a temperature higher than expected, and the light source is not well cooled by the heat sink 19, the intake fan 20, and the exhaust fan 21.

  In order to investigate the cause, the flow of air by the intake fan 20 and the exhaust fan 21 was examined. As a result, the air flowing into the case 11 from the outside through the intake port 17 was radiated from the first heat exchange portion 23 of the heat sink 19. After passing between the fins 26, not all of it flows toward the second heat exchanging part 24 (exhaust fan 21), but a part thereof deviates to both sides in the orthogonal direction D <b> 2 with respect to the second heat exchanging part 24. I understood. Then, the air deviated to both sides of the second heat exchange unit 24 flows to the intake fan 20 side along the inner peripheral surface 32 of the case 11, and most of the air is sucked into the intake fan 20, whereby the first heat exchange unit. It was found that air deprived of heat circulated in the case 11.

  Therefore, the inventor of the present application considered providing the partition walls 33 on both sides in the orthogonal direction D2 with respect to the heat sink 19. By providing the partition wall 33, it is possible to prevent the air hitting the first heat exchanging part 23 of the heat sink 19 from flowing to the side of the second heat exchanging part 24 (exhaust fan 21), and the first heat exchanging part 23. The air that has passed through can be sucked into the exhaust fan 21 satisfactorily. As a result, it is possible to prevent the air deprived of heat from the first heat exchanging unit 23 from circulating in the case 11, and to satisfactorily exchange the air in the case 11 and the outside air. Thus, the LED light source 13 can be satisfactorily cooled.

  In addition, the inventor of the present application provides the first heat exchange unit 23 and the second heat exchange unit 24 between the first heat exchange unit 23 and the second heat exchange unit 24 so that the air passing through the first heat exchange unit 23 is sucked into the exhaust fan 21 better. It was considered to provide a blower fan 22 that blows air from the heat exchange unit 23 toward the second heat exchange unit 24. By providing the blower fan 22, a flow of air from the intake fan 20 toward the exhaust fan 21 is forcibly formed, so that a part of the air hitting the first heat exchanging portion 23 is lateral to the exhaust fan 21. Can be further prevented.

  Further, in the lighting device 1, the partition wall 33 enters between the first heat exchange unit 23 and the second heat exchange unit 24. Thereby, since the clearance gap between the ventilation fan 22 and the partition wall 33 can be made small, it can prevent that the air which contacted the 1st heat exchange part 23 escapes to the side of the ventilation fan 22 through the clearance gap. As a result, the air hitting the first heat exchanging unit 23 can be satisfactorily sucked into the blower fan 22 and sent from the blower fan 22 toward the exhaust fan 21, and the second heat exchanging unit 24 is caused by the air. It can cool well. Therefore, the LED light source 13 can be cooled more favorably through the heat sink 19.

  The peripheral wall 16 of the case 11 has a cylindrical inner peripheral surface 32. When the inner peripheral surface 32 of the case 11 has a cylindrical shape, air that flows to the side of the exhaust fan 21 without being sucked into the exhaust fan 21 tends to flow along the inner peripheral surface 32 to the air suction side of the intake fan. Since the partition wall 33 is erected on the inner peripheral surface 32, it is possible to prevent the air flow along the inner peripheral surface 32 from being formed.

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, although the brightness of the LED light source 13 is set to 4000 lm to 16000 lm, it may be less than that range or more than that range.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Illuminating device 11 Case 13 LED light source 16 Perimeter wall 17 Intake port 18 Exhaust port 19 Heat sink 20 Intake fan 21 Exhaust fan 22 Blower fan 23 1st heat exchange part 24 2nd heat exchange part 25 Construction part 32 Inner peripheral surface 33 Partition wall

Claims (4)

A case having a peripheral wall;
An air inlet formed in the peripheral wall;
An exhaust port formed at a position facing the intake port in a predetermined direction on the peripheral wall;
A light source provided in the case;
A heat sink disposed between the air inlet and the air outlet and contacting the light source from a side opposite to a light projecting side from the light source;
An air intake fan disposed in the case so as to face the air intake port in the predetermined direction, and for sucking air into the case through the air intake port;
An exhaust fan disposed in the case so as to face the exhaust port in the predetermined direction, and for exhausting air from the case through the exhaust port;
A partition wall provided in the case so as to partition a space in which the intake fan is disposed and a space in which the exhaust fan is disposed on both sides of the heat sink in a direction orthogonal to the predetermined direction. seen including,
The peripheral wall has a cylindrical inner peripheral surface,
The said partition wall is an illuminating device erected on the said internal peripheral surface . The heat sink includes a first heat exchange unit disposed on the inlet side with respect to the partition wall, a second heat exchange unit disposed on the exhaust port side with respect to the partition wall, and the first heat. An exchanging portion and a second heat exchanging portion that are installed so as to be capable of transferring heat, and are provided with an erected portion that comes into contact with the light source,
2. The fan according to claim 1, further comprising a blower fan that is disposed between the first heat exchange unit and the second heat exchange unit and blows air from the first heat exchange unit toward the second heat exchange unit. Lighting device.   A case having a peripheral wall;
  An air inlet formed in the peripheral wall;
  An exhaust port formed at a position facing the intake port in a predetermined direction on the peripheral wall;
  A light source provided in the case;
  A heat sink disposed between the air inlet and the air outlet and contacting the light source from a side opposite to a light projecting side from the light source;
  An air intake fan disposed in the case so as to face the air intake port in the predetermined direction, and for sucking air into the case through the air intake port;
  An exhaust fan disposed in the case so as to face the exhaust port in the predetermined direction, and for exhausting air from the case through the exhaust port;
  A partition wall provided in the case so as to partition a space in which the intake fan is disposed and a space in which the exhaust fan is disposed on both sides of the heat sink in a direction orthogonal to the predetermined direction. Including
  The heat sink includes a first heat exchange unit disposed on the inlet side with respect to the partition wall, a second heat exchange unit disposed on the exhaust port side with respect to the partition wall, and the first heat. An exchanging portion and a second heat exchanging portion that are installed so as to be capable of transferring heat, and are provided with an erected portion that contacts the light source,
  An illuminating device further comprising a blower fan that is disposed between the first heat exchange unit and the second heat exchange unit and blows air from the first heat exchange unit toward the second heat exchange unit. The lighting device according to claim 2 or 3 , wherein the partition wall is interposed between the first heat exchange unit and the second heat exchange unit.

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