JP2013235724A - Led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting fixture capable of generating airstream with substantial heat radiation effects.SOLUTION: A ventilating part 25 is provided between a lower outer cylinder 20 and an LED light source 44, and an outflow channel 27 is provided between the lower outer cylinder 20 and an upper outer cylinder 30 for air to flow outside from the lower outer cylinder 20. Then, inflow channels 323, 324 flowing in from the lower outer cylinder 20 to an upper outer cylinder 30 are provided, as well as an outflow port 37 at an upper end of the upper outer cylinder 30. With this, rising airstream generated by heat released from the LED light source 44 flows outside from the outflow channel 27 fitted between the lower outer cylinder 20 and the upper outer cylinder 30, through the ventilating part fitted between the lower outer cylinder 20 and the LED light source 44. Further, air flows in from the lower outer cylinder 20 to the upper outer cylinder 30 through the inflow channels 323, 324, and flows outside from the outflow port 37 provided at an upper end of the upper outer cylinder 30. For this, flow of air for cooling the LED light source 44 housed in the lower outer cylinder 20 and a power source device 33 housed in the upper outer cylinder 30 is easily generated to exhibit substantial heat radiation effects.

Description

  The present invention relates to an LED lighting apparatus using an LED as a light source.

Conventionally, LED lighting fixtures using LEDs as light sources are known (see, for example, Patent Document 1).
As shown in FIG. 6, the lighting fixture 100 described in Patent Document 1 is used by being embedded in, for example, a ceiling. The luminaire 100 emits light downward when in use.
The luminaire 100 includes a housing 101 that covers the whole, a substrate 103 on which a light source element (LED) 104 is mounted, a power supply circuit 105 that supplies lighting power, and a cover 102 that covers the power supply circuit 105.
The housing 101 has a vent hole 107 outside the substrate 103 of the back surface portion 106. The front part 108 has a large rectangular opening at the center, for example. The inner portion 109 has a gap through which air passes between the inner portion 109 and the substrate 103.

  When an air flow is generated by the heat generated by the light source element 104 and the power supply circuit 105 during lighting, the air around the cover 102 is heated and becomes an air flow rising along the side surface 110. The airflow rising along the side surface portion 110 strikes the substrate 103 and changes its direction, and flows in the lateral direction along the surface of the substrate 103. The airflow flowing along the substrate 103 cools the light source element 104 through the periphery of the light source element 104. The airflow that has cooled the light source element 104 enters the housing 101 through a gap between the substrate 103 and the inner portion 109. The airflow that has entered the housing 101 goes around the substrate 103, passes through the vent 107, and is discharged to the back side of the housing 101. In this way, heat is dissipated.

Japanese Patent Laying-Open No. 2011-192403 (FIG. 3)

  However, in the lighting fixture 100 described in Patent Document 1 as described above, since the amount of heat generated by the power supply circuit 105 is generally smaller than the amount of heat generated by the light source element 104, sufficient airflow is not generated and sufficient heat dissipation is performed. There was a problem that sometimes it was not.

  The present invention has been made to solve the conventional problems, and an object thereof is to provide an LED lighting apparatus capable of generating an airflow having a sufficient heat dissipation effect.

  The LED lighting apparatus of the present invention includes a lamp unit, an LED light source unit attached to the lamp unit, a cylindrical lower outer cylinder that accommodates the lamp unit, and a cylindrical upper part provided above the lamp unit. An outer cylinder and a power supply device attached to the inside of the upper outer cylinder, and a ventilation portion is provided between the lower outer cylinder and the LED light source unit, and the lower outer cylinder and the upper outer cylinder In between, an outflow path through which air flows out from the lower outer cylinder is provided, an inflow path from which the lower outer cylinder flows into the upper outer cylinder is provided, and an outlet is provided at the upper end of the upper outer cylinder Is.

  Moreover, the LED lighting fixture of this invention is integrally provided with the thermal radiation part which discharge | releases the heat | fever which the said LED light source part emits between a tool part and the said lower outer cylinder.

  In the present invention, the ascending airflow generated by the heat generated by the LED light source section is provided between the lower outer cylinder and the upper outer cylinder through the ventilation section provided between the lower outer cylinder and the LED light source section. It flows out from the spillway. Further, air flows from the lower outer cylinder to the upper outer cylinder through the inflow passage, and flows out from the outlet provided at the upper end of the upper outer cylinder. For this reason, LED which has the effect that the flow of the air which cools the LED light source part accommodated in the lower outer cylinder, and the power supply device accommodated in the upper outer cylinder generate | occur | produces easily, and can have sufficient heat dissipation effect Lighting equipment can be provided.

(A) is sectional drawing which cut | disconnected longitudinally the LED lighting fixture of embodiment which concerns on this invention, (B) is the bottom view seen from B direction in (A) The exploded perspective view which looked at the LED lighting fixture of embodiment which concerns on this invention from upper direction The exploded perspective view which looked at the LED lighting fixture of embodiment which concerns on this invention from the downward direction Sectional drawing which shows the flow of the air in the LED lighting fixture of embodiment which concerns on this invention Sectional drawing which shows the flow of the air in the modification of the LED lighting fixture of embodiment which concerns on this invention Cross-sectional view of a conventional lighting fixture

Hereinafter, the LED lighting fixture of embodiment which concerns on this invention is demonstrated using drawing.
As shown in FIG. 1, the LED lighting apparatus 10 according to the embodiment of the present invention can be attached to, for example, a ceiling surface 90 that is a mounted portion, and can be used mainly to illuminate the lower part.
The LED lighting apparatus 10 includes a cylindrical lower outer cylinder 20 that opens up and down (upper opening 21 and lower opening 22), and an upper outer cylinder 30 that opens upward (upper opening 31).
As shown in FIG. 2, a plurality of heat radiating fins (heat radiating portions) 23 are provided in the lower outer cylinder 20 radially about the central axis CL <b> 1 of the lower outer cylinder 20. The radiating fins 23 are provided integrally with the lower outer cylinder 20.

As shown in FIG. 1, a cylindrical recess 24 is provided in the central portion of the radiating fin 23, and a lamp unit 40 is attached and accommodated in the recess 24.
The lamp unit 40 has a cylindrical main body 41 that opens downward (opening 42). The outer diameter of the main body 41 is smaller than the inner diameter of the lower outer cylinder 20, and a gap (ventilation part) 25 is provided between the main body 41 and the lower outer cylinder 20. The gap 25 communicates with the upper opening 21 and the lower opening 22 of the lower outer cylinder 20.

In the lamp unit 40, an LED light source unit 44 is attached to the lower surface of the upper plate 43 of the main body 41. The LED light source unit 44 includes an LED 441 and a substrate 442 on which the LED 441 is mounted.
In the irradiation direction of LED light source unit 44 (downward in FIG. 1A), there is a reflector 45 that reflects light from LED 441 in a predetermined direction and range. The reflection plate 45 has a reflection surface 451 having a curved surface shape (for example, a paraboloid shape).
A translucent panel 46 is provided in front of the reflecting plate 45. The panel 46 is attached to the front end (lower end) of the main body 41 by fastening a ring-shaped panel pressing member 47 with a screw 471.

As shown in FIG. 3, the bottom surface 32 of the upper outer cylinder 30 has an inclined portion 321 at the outer peripheral portion and a flat portion 322 at the center. The flat portion 322 is provided with an opening (inflow path) 323 and a through hole (inflow path) 324.
The lower outer cylinder 20 and the upper outer cylinder 30 are joined by a screw hole (not shown) provided at the center of the bottom surface of the upper outer cylinder 30 and a central portion 231 of the radiating fin 23 of the lower outer cylinder 20 (FIG. 2). (See FIG. 4) by fastening with the screw 26.
At this time, since the inclined portion 321 is provided on the outer peripheral portion of the bottom surface 32 of the upper outer cylinder 30, an opening (outflow path) is provided between the upper outer cylinder 30 and the lower outer cylinder 20 along the circumference. 27 is formed.

As shown in FIG. 1, a power supply device 33 is accommodated in the upper outer cylinder 30. The power supply device 33 is attached to the bottom surface 32 of the upper outer cylinder 30, and an attachment plate 34 is attached on the power supply device 33 (see FIG. 2).
As shown in FIG. 2, the mounting plate 34 is bent up along two opposing sides to be provided with a standing wall 341, and the standing wall 341 is provided with a slit 342 along the horizontal direction. A gap (outlet) 37 is formed between the standing wall 341 and the upper outer cylinder 30.
A mounting bracket 35 is provided on the mounting plate 34. The mounting bracket 35 has a substantially prismatic shape, and an arm 352 projects from the side wall 351. The tip of the arm 352 is bent upward in an L shape to form a locking portion 353.

Therefore, the mounting bracket 35 is mounted on the upper outer cylinder 30 by locking the locking portion 353 of the arm 352 of the mounting bracket 35 through the slit 342 of the standing wall 341 of the mounting plate 34.
Mounting screws 36 are provided on the top plate 354 of the mounting bracket 35 so as to protrude upward, and the LED lighting apparatus 10 is mounted on the ceiling surface 90 by attaching the mounting screws 36 to the ceiling surface 90.

Next, the flow of air in the LED lighting apparatus 10 will be described.
As shown in FIG. 4, when the LED light source unit 44 in the lower outer cylinder 20 generates heat, an upward airflow A1 is generated in the lower outer cylinder 20, and air A2 flows into the lower outer cylinder 20 from below. (See FIG. 2).
The air A2 flows in from the gap 25 provided between the lower outer cylinder 20 and the lamp unit 40 on the lower surface of the lower outer cylinder 20 (see FIG. 2).

A part of the rising airflow A1 rises along the radiation fins 23 and flows out along the inclined portion 321 of the upper outer cylinder 30 from the opening 27 between the lower outer cylinder 20 and the upper outer cylinder 30. (A3). At this time, the radiation fins 23 are cooled.
The ascending air current A <b> 3 is generated along the outer surface of the lower outer cylinder 20 and the outer surface of the upper outer cylinder 30 to cool the upper outer cylinder 30.

A part of the rising airflow A1 rises along the space between the heat radiating fins 23 and escapes from the opening 323 and the through hole 324 provided in the bottom surface 32 of the upper outer cylinder 30 into the upper outer cylinder 30 (A4). (See FIG. 3).
Further, the ascending air current A4 passes through the side of the power supply device 33 and escapes to the outside from the gap 37 between the upper outer cylinder 30 and the ceiling surface 90 (A5). During this time, the power supply device 33 is cooled.

As described above, according to the LED lighting apparatus 10 of the embodiment according to the present invention described above, the gap 25 is provided between the lower outer cylinder 20 and the LED light source unit 44, and the lower outer cylinder 20 and the upper outer cylinder 30 are provided. An opening 27 through which air flows out from the lower outer cylinder 20 is provided. Further, an opening 323 and a through hole 324 that flow into the upper outer cylinder 30 from the lower outer cylinder 20 are provided, and a gap 37 through which air escapes is provided at the upper end of the upper outer cylinder 30.
As a result, the upward air flow generated by the heat generated by the LED light source unit 44 passes through the gap 25 provided between the lower outer tube 20 and the LED light source unit 44, and the lower outer tube 20 and the upper outer tube 30. It flows out from the opening 27 provided between the two. Further, air flows from the lower outer cylinder 20 into the upper outer cylinder 30 through the opening 323 and the through hole 324, and flows out from the gap 37 provided at the upper end of the upper outer cylinder 30.
For this reason, the air flow which cools the LED light source part 44 accommodated in the lower outer cylinder 20, and the power supply device 33 accommodated in the upper outer cylinder 30 can generate | occur | produce easily, and it can have sufficient heat dissipation effect.

  Moreover, since the radiation fin 23 which discharge | releases the heat | fever which the LED light source part 44 emits is integrally provided between the lamp | ramp part 40 and the lower outer cylinder 20, the heat which the LED light source part 44 emitted is the radiation fin. The heat is transmitted to the lower outer cylinder 20 through 23 and radiated.

In addition, the LED lighting fixture of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
In LED lighting fixture 10 mentioned above, the case where the multistage power supply device 33 was attached to the bottom face 32 of the upper outer cylinder 30 was illustrated. In addition, when the height of the power supply device 38 is low as in the LED lighting apparatus 11 shown in FIG. 5, the air A <b> 7 can also flow under the power supply device 33.
In addition, suppose that the same code | symbol is attached | subjected to the site | part which is common with the said LED lighting fixture 10, and the overlapping description is abbreviate | omitted.
By doing in this way, the heat dissipation effect can be improved further.

10, 11 LED lighting fixture 20 Lower outer cylinder 23 Radiation fin (heat dissipation part)
25 Clearance (ventilation part)
27 Opening (outflow channel)
30 Upper outer cylinder 323 Opening (inflow channel)
324 Through hole (inflow channel)
33 Power supply 37 Gap (outlet)
40 Lamp unit 44 LED light source unit

Claims (2)

A lamp part,
An LED light source unit attached to the lamp unit;
A cylindrical lower outer tube that houses the lamp part;
A cylindrical upper and outer cylinder provided above the lamp unit;
A power supply device mounted inside the upper outer cylinder,
A ventilation part is provided between the lower outer cylinder and the LED light source part,
Between the lower outer cylinder and the upper outer cylinder, an outflow path through which air flows out from the lower outer cylinder is provided,
Providing an inflow path for flowing from the lower outer cylinder to the upper outer cylinder;
The LED lighting fixture which provided the outflow port in the upper end of the said upper outer cylinder. In the LED lighting fixture of Claim 1,
An LED lighting apparatus in which a heat dissipating unit that releases heat generated by the LED light source unit is integrally provided between the lamp unit and the lower outer cylinder.

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