JP2012248344A - Led lighting lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and lightweight LED lighting lamp capable of attaining life extension of an LED and a lighting device as well as improvement in light-emitting efficiency of the former by efficiently cooling them both.SOLUTION: In the LED lighting lamp 1, an exhaust port 4 is formed between a lens 3 and a case 2 by preparing the lens 3 at an opening at one end of the cylindrical case 2 with a bottom, and an air intake port 5 is formed on a bottom section of the case 2. A space S formed inside the case 2 is made communicated with the air via the air intake port 5 and the exhaust port 4, and the LED 6, the lighting device 7 for driving the LED 6, a resin case 8 for insulating the lighting device 7, and a fan 9 are arranged in the space S.

Description

  The present invention relates to an LED illuminating lamp using an LED (light emitting diode) as a light source.

  Since LEDs have features such as high brightness, power saving, and long life, in recent years, LEDs are being used as light sources for general lighting as well as street lights and road lights. .

  Here, an example of an illumination lamp (hereinafter referred to as an LED illumination lamp) using a conventional LED as a light source is shown in FIG.

  That is, FIG. 10 is a side sectional view of a bulb-type LED illuminating lamp. The illustrated LED illuminating lamp 101 is a light-transmitting outer lens that covers a cup-shaped casing 102 and one end (the upper end in FIG. 10) opening. The LED board 123 on which the LED 106 is mounted, the lighting device 107 for driving the LED 106, the resin case 108 for electrically insulating the lighting device 107, and the LED 106 are emitted in the sealed space S defined by 103. A reflector (or a light distribution lens) 124 that reflects the light to be reflected is accommodated. Since such LED lighting 101 generates heat by light emission of the LED 106 and driving of the lighting device 107, it is efficiently cooled to reduce the light emission efficiency and life of the LED 106, and an electric field capacitor and IC in the lighting device 107 are not shown. It is necessary to prevent the lifespan of the electronic parts from decreasing.

  Therefore, the casing 102 is made of aluminum having high thermal conductivity, the periphery of the LED substrate 123 is brought into close contact with the casing 102, and the heat generated from the LED 106 is conducted from the LED substrate 123 to the casing 102. The LED 106 is cooled by radiating heat to the external air by radiation from the surface 102. In this case, in order to expand the heat radiation area of the housing 102, a heat radiation fin is provided in the housing 102.

  When such a cooling method using heat radiation from the surface of the housing 102 is employed, the amount of heat generation increases when the output of the LED 106 is increased to increase the brightness, and the housing 102 is enlarged accordingly (the surface area is increased). Therefore, brightness and size (surface area of the housing 102) are in a trade-off relationship in the LED lighting 101.

  By the way, Patent Document 1 discloses a light emitting device in which a light source and a ventilation unit are housed in a sealed container, and heat generated from the light source is transported to the inner surface of the container by an air flow generated by the ventilation unit, thereby improving the cooling performance. Has been proposed.

Japanese translation of PCT publication 2010-541152

  However, in the LED illuminating lamp 101 shown in FIG. 10, the LED 106 and the lighting device 107 that are heat sources are housed in the sealed space S in the housing 102, so that the cooling effect is limited only by heat radiation from the housing 102. Yes, the LED 106 and the lighting device 107 cannot be sufficiently cooled, and depending on the use environment, the deterioration of the electronic components of the LED 106 and the lighting device 107 due to heat becomes remarkable, and the life of the LED lighting lamp 101 as a product is shortened. There was a problem. Also in the light emitting device proposed in Patent Document 1, since the light source and the ventilation unit are accommodated in the sealed container, the air flow generated by the ventilation unit only circulates in the sealed container. The cooling effect is limited because it depends on cooling by heat radiation from

  The present invention has been made in view of the above problems, and the object of the present invention is a small and light weight capable of efficiently cooling the LED and the lighting device to extend their life and improve the luminous efficiency of the LED. The object is to provide an LED lighting.

In order to achieve the above object, the invention according to claim 1
A lens is disposed at one end opening of the bottomed cylindrical casing to form an exhaust port between the lens and the casing, and an intake port is formed at the bottom of the casing.
In order to insulate the LED, the lighting device that drives the LED, and the lighting device in the space, while communicating the space formed inside the housing to the atmosphere via the intake port and the exhaust port The LED case is configured by arranging the resin case and the fan.

The invention according to claim 2 is the invention according to claim 1,
In the resin case, a duct that opens on one side is formed in the lateral direction,
On the bottom surface of the duct, a vent hole communicating with the air inlet formed in the bottom of the housing is formed,
An L-shaped base sheet metal composed of a vertical part covering the opening of the duct and a horizontal part covering the upper surface of the resin case is attached to the resin case,
The fan is attached to the inner surface of the vertical portion of the base sheet metal so that the opening of the duct and the air inlet of the fan are in communication with each other, and the upper surface of the fan and the horizontal portion of the base sheet metal covering the fan, Each of the vents communicating with each other is formed,
The LED is disposed on the upper surface of the horizontal portion of the sheet metal base,
The lighting device is arranged in a duct of the resin case.

  According to a third aspect of the present invention, in the second aspect of the present invention, the lighting device is configured by mounting electronic components on a flat board, and the lighting device includes the outside air in the duct of the resin case. It arrange | positions along the flow of this.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a plurality of air intake ports different from the air intake ports are formed around the bottom of the housing, and the air intake ports are provided in the space in the housing. The sucked outside air passes through the periphery of the resin case and the sheet metal base and flows to the exhaust port.

  According to the first and second aspects of the present invention, when the fan is driven, outside air is sucked into the space in the housing from the air inlet formed in the bottom portion of the housing, and the sucked outside air enters the space. The LED, the lighting device, and the resin case that are disposed flow to the exhaust port while cooling, and are discharged from the exhaust port to the atmosphere. In this way, the outside air continuously flows through the space in the casing and forcibly air-cools the LED and the lighting device, so that the electronic components of the LED and the lighting device are efficiently cooled, and the temperature rise is suppressed. For this reason, while the luminous efficiency of LED is improved, the lifetime of this LED and an electronic component is extended, and durability of the LED lighting lamp as a product is improved. Moreover, since it is not necessary to enlarge the surface area to increase the cooling performance to increase the surface area, or to provide heat radiating fins or the like on the outer surface of the housing, it is possible to reduce the size and weight of the LED lighting.

  According to the invention of claim 3, since the board of the lighting device is arranged along the flow of the outside air in the duct, the board does not block the flow of the outside air in the duct, and the electronic component mounted on the board is not The outside air flowing through the duct is efficiently cooled and the temperature rise is suppressed.

  According to the fourth aspect of the present invention, the outside air sucked into the space in the housing from the plurality of air inlets formed around the bottom of the housing passes through the periphery of the resin case and the base sheet metal to the exhaust port. Since the resin case and the base sheet metal are cooled in the process of flowing, the lighting device disposed in the duct in the resin case and the LED mounted on the base sheet metal are also cooled at the same time, and the temperature rise thereof is suppressed.

It is a top view of the LED illuminating lamp which concerns on this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a bottom view of the LED illumination lamp which concerns on this invention. It is the perspective view which looked at the LED illumination lamp which concerns on this invention from diagonally upward. It is the perspective view which looked at the LED illumination lamp which concerns on this invention from diagonally downward. It is a disassembled perspective view of the LED illumination lamp which concerns on this invention. It is a perspective view which shows the assembly state of the resin case and base sheet metal of the LED lighting lamp which concerns on this invention. It is a perspective view which shows the assembly point to the LED illumination light which concerns on this invention. It is a sectional side view of the conventional LED illuminating lamp.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a plan view of an LED illumination lamp according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 5 is a perspective view of the LED illumination lamp as viewed obliquely from above, FIG. 6 is a perspective view of the LED illumination lamp as viewed from obliquely below, FIG. 7 is an exploded perspective view of the LED illumination lamp, and FIG. The perspective view which shows the assembly state of the resin case and base sheet metal of an illuminating lamp, FIG. 9 is a perspective view which shows the assembly point to the LED illuminating lamp.

  In the LED illuminating lamp 1 according to the present embodiment, a lens 3 for light distribution is arranged at the center of an opening of one end (upper end in FIGS. 2 and 3) of a bottomed cylindrical housing 2, and the lens 3 An annular exhaust port 4 (see FIG. 5) is formed between the housing 2 and the casing 2, and a circular hole-like intake port 5 (see FIG. 6) is formed at the bottom of the casing 2. The space S formed inside is communicated with the atmosphere via the intake port 5 and the exhaust port 4, and as shown in FIGS. 2 and 3, the LED 6 as a light source and the LED 6 are disposed in the space S. A lighting device 7 to be driven, and a resin case 8 and a fan 9 for insulating the lighting device 7 are arranged. A reflector may be used as the light distribution means instead of the lens 3.

  The casing 2 is made of high heat conductive aluminum, heat radiating resin, heat radiating ceramic, or the like. As shown in FIGS. 4 and 6, the intake port 5 is provided at four locations around the bottom of the casing 2. A slit-like air inlet 10 different from the above is formed. As shown in FIGS. 4 and 6, a slit-like rectangular hole 12 is formed at the bottom of the housing 2 for passing a power supply harness 11 extending from the lower portion of the lighting device 7.

  The resin case 8 is formed into a block shape with a resin having high electrical insulation, and a duct 13 (see FIG. 7) having a circular cross section that opens on one side is formed in the lateral direction. Further, as shown in FIG. 4, a rectangular hole 14 is formed in the upper part of the resin case 8, and a notch 15 is formed in a portion opposite to the rectangular hole 14. As shown in FIG. 7, a circular vent hole 16 communicating with the intake port 5 formed at the bottom of the housing 2 is formed at the bottom of the resin case 8, and the bottom of the housing 2 is formed. A rectangular hole 17 is formed in communication with the rectangular hole 12 formed at the bottom.

  The resin case 8 is provided with an L-shaped base metal plate 18 that closes the opening of the duct 13 and abuts against the upper surface of the resin case 8. The base metal plate 18 is made of aluminum having high thermal conductivity, and the fan 9 is formed on the inner surface of the vertical portion 18a that stands vertically (the surface facing the opening of the duct 13 of the resin case 8). The air inlet 9 a of the fan 9 is attached in communication with the opening of the duct 13 in the vertical direction so that the rotation axis is in the same direction as the direction. Here, a centrifugal fan such as a sirocco fan is used as the fan 9. As shown in FIG. 7, a vent 9b is formed on the upper surface of the fan 9, and the outside air sucked from the intake 9a is discharged from the vent 9b.

  Further, a horizontal portion 18b bent at a right angle from the upper end of the vertical portion 18a of the base metal plate 18 is attached to the upper surface of the resin case 8 as shown in FIGS. The LED 6 is attached, and a plurality of slit-shaped vents 19 communicating with the vent 9b formed on the upper surface of the fan 9 are formed (see FIG. 7).

  As shown in FIG. 7, the lighting device 7 is configured by mounting electronic parts such as an electric field capacitor 21 and an IC 22 on a rectangular flat board 20, and the board 20 is formed on an upper part of the resin case 8. It is installed in the duct 13 by being fitted into the notch 15 and inserted into the duct 13 in the resin case 8 through the rectangular hole 14 from above. At this time, the board 20 of the lighting device 17 is arranged along the flow direction of the outside air in the duct 13 at the axial center of the duct 13. The power supply harness 11 extending from the lower portion of the lighting device 17 is drawn out of the housing 2 through the resin case 8 and the rectangular holes 17 and 12 formed in the bottoms of the housing 2.

  When assembling the LED illuminating lamp 1 configured as described above, as shown in FIG. 9, the resin case 8, the fan 9, the lighting device 7, the base sheet metal 18, and the lens 3 from its one end opening in the housing 2. Are incorporated sequentially.

  Thus, the LED illuminating lamp 1 configured as described above is energized to the lighting device 7 when a switch (not shown) is turned on, and the LED 6 is activated by the lighting device 7 to emit light. The light is distributed by passing through the lens 3 and then emitted to be used for ambient illumination.

  At the same time, the fan 9 built in the housing 2 is driven, and the outside air is introduced into the duct 13 of the resin case 8 from the circular air inlet 5 and the air vent 16 formed in the bottom portions of the housing 2 and the resin case 8. Is sucked in as shown by the arrows in FIGS. The outside air sucked into the duct 13 flows in the duct 13 in the lateral direction toward the fan 9, and in the process, the electronic parts such as the resin case 8, the electric field capacitor 21 of the lighting device 7, the IC 22, and the base sheet metal 18. The LED 6 is cooled through. The outside air whose temperature has risen due to cooling is sucked into the fan 9 to be increased in pressure, and the outside of the fan 9 is removed from the vent 9b formed in the upper surface of the fan 9 and the vent 19 formed in the horizontal portion 18b of the base metal plate 18. As shown by the arrows in FIGS. 2 and 5, the air is discharged into the atmosphere from the exhaust port 4 while cooling around the lens 3.

  As described above, when the outside air vigorously flows out of the fan 9 from the vent 9b formed in the upper surface of the fan 9 and the vent 19 formed in the horizontal portion 18b of the base metal plate 18, the flow of the surrounding air Since the pressure is reduced and negative pressure is generated, the external air is caused by the negative pressure from the intake port 10 formed at four locations around the bottom of the housing 2 as shown by broken line arrows in FIGS. 2, the outside air sucked into the space S flows upward around the resin case 8 and the base metal plate 18 in the housing 2 as indicated by broken line arrows in FIG. In this process, the resin case 8 and the base metal plate 18 are cooled. Thereafter, the outside air is drawn by the negative pressure and flows laterally under the lens 3, and the LED 6 is directly cooled in the process. And the outside air which cooled LED6 merges with the outside air which flows out out of the vent 19 of the base metal plate 8, and is discharged | emitted from the exhaust port 4 in air | atmosphere as shown by the arrow in FIG.2 and FIG.5.

  As described above, in the LED illuminating lamp 1 according to the present embodiment, when the fan 9 is driven, outside air enters the space S in the housing 2 from the air inlet 5 formed in the bottom of the housing 2. The sucked outside air flows to the exhaust port 4 while cooling the LED 6, the lighting device 7, and the resin case 8 disposed in the space S, and is discharged from the exhaust port 4 to the atmosphere. Since the outside air continuously flows through the space S in the housing 2 and forcibly air-cools the LED 6 and the lighting device 7, electronic components that are vulnerable to heat such as the electric field capacitor 21 and the IC 22 of the LED 2 and the lighting device 7 are efficiently used. Cooling suppresses these temperature rises. For this reason, the luminous efficiency of the LED 6 is enhanced, the lifetime of the LED 6 and electronic components such as the electric field capacitor 21 and the IC 22 is extended, and the durability of the LED lighting lamp 1 as a product is enhanced. In addition, it is not necessary to enlarge the surface area of the housing 2 to increase the cooling performance, or to provide heat radiating fins or the like on the outer surface of the housing 2, so that the LED lamp 1 can be reduced in size and weight. Can be planned.

  In this embodiment, since the board 20 of the lighting device 7 is arranged along the flow of the outside air in the duct 13, the board 20 does not block the flow of the outside air in the duct 13 and is mounted on the board 20. The electronic components such as the electric field capacitor 21 and the IC 22 are efficiently cooled by the outside air flowing through the duct 13, and the temperature rise is suppressed.

  Further, in the present embodiment, the outside air sucked into the space S in the housing 2 from the plurality of air inlets 10 formed around the bottom of the housing 2 passes around the resin case 8 and the base metal plate 18. Since the resin case 8 and the base sheet metal 18 are cooled in the process of flowing to the exhaust port 4, the lighting device 7 disposed in the duct 13 in the resin case 8 and the LED 6 mounted on the base sheet metal 18 are also cooled at the same time. The effect that these temperature rises are suppressed is acquired. Further, in the present embodiment, if fins are further provided on the inner surface of the housing 2, the outside air flowing from the intake port 10 through the LED 6 to the exhaust port 4 is rectified to further increase the ventilation efficiency.

  If the aluminum base sheet metal 18 is also brought into close contact with the aluminum casing 2, the heat generated by the LED 6 can be conducted to the base sheet metal 18 and the casing 2 and radiated from the surface of the casing 2. Therefore, the cooling effect is further enhanced.

DESCRIPTION OF SYMBOLS 1 LED illumination light 2 Case 3 Lens 4 Exhaust port 5 Intake port 6 LED
DESCRIPTION OF SYMBOLS 7 Lighting device 8 Resin case 9 Fan 9a Fan inlet 9b Fan vent 10 Inlet 11 Power supply harness 12 Rectangular hole 13 Duct 14 Rectangular hole 15 Notch 16 Vent hole 17 Rectangular hole 18 Base sheet metal 18a Base sheet metal vertical Part 18b Horizontal part of the base sheet metal 19 Ventilation hole 20 Lighting device board 21 Electrolytic capacitor
22 IC (electronic parts)
S space

Claims (4)

A lens is disposed at one end opening of the bottomed cylindrical casing to form an exhaust port between the lens and the casing, and an intake port is formed at the bottom of the casing.
In order to insulate the LED, the lighting device that drives the LED, and the lighting device in the space, while communicating the space formed inside the housing to the atmosphere via the intake port and the exhaust port An LED illumination lamp comprising a resin case and a fan. In the resin case, a duct that opens on one side is formed in the lateral direction,
On the bottom surface of the duct, a vent hole communicating with the air inlet formed in the bottom of the housing is formed,
An L-shaped base sheet metal composed of a vertical part covering the opening of the duct and a horizontal part covering the upper surface of the resin case is attached to the resin case,
The fan is attached to the inner surface of the vertical portion of the base sheet metal so that the opening of the duct and the air inlet of the fan are in communication with each other. Each of the vents communicating with each other is formed,
The LED is disposed on the upper surface of the horizontal portion of the sheet metal base,
The LED lighting lamp according to claim 1, wherein the lighting device is disposed in a duct of the resin case.   The lighting device is configured by mounting electronic components on a flat board, and the lighting device is arranged so that the board follows the flow of outside air in the duct of the resin case. LED lighting. A plurality of air inlets different from the air inlets are formed around the bottom of the housing, and outside air sucked into the space in the housing from the air inlets passes around the resin case and the sheet metal base. The LED illumination lamp according to claim 2, wherein the LED illumination lamp is made to flow to the exhaust port.

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