JP5870293B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture.

  2. Description of the Related Art Conventionally, there has been provided a lighting fixture that is embedded in a ceiling surface and emits light downward, and includes a fan for air cooling (see, for example, Patent Document 1). In particular, when a light-emitting diode is used as a light source, the light-emitting diode is more likely to cause a decrease in light flux or a deterioration due to heat as compared with other electrical light sources, and thus the above-described fan is often provided. .

JP 2010-153198 A

  Conventionally, a lamp body that holds a light emitting diode so as to emit light downward, and a cover that covers a space other than the lower surface of the lamp body with a gap between them, and a vent that penetrates vertically through the center of the lamp body There was a hole. The fan is disposed on the upper side of the vent hole, and generates an airflow that flows in from the gap between the outer periphery of the lamp body and the inner periphery of the cover and flows out from the vent hole.

  In the above configuration, both inflow and outflow of the airflow are performed on the lower side of the fan, so that the airflow resistance is relatively large and the efficiency of air cooling is low.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can improve the efficiency of air cooling.

The luminaire of the present invention includes a main body portion that is embedded in a ceiling material while holding an electric light source in a direction in which light is emitted downward, and a plurality of heat radiating fins protruding from the outer surface of the main body portion. a fixture having, e Bei a cover to form a gap between the outer surface of the lamp body having respective openings in the upper and lower ends, is disposed in the gap and a fan for generating an upward airflow, horizontal An airflow guiding portion for guiding an upward airflow upward is provided on the lower side of the fan .

  In the above-described lighting fixture, it is preferable that the fan is disposed on the upper side of the lamp body, and the heat radiating fins are extended to a vertical position aligned in a horizontal direction with respect to the fan.

  Furthermore, in the above-described lighting apparatus, it is preferable that the main body portion has a bottomed cylindrical shape, and the heat radiating fins protrude from the outer peripheral surface of the main body portion at equal intervals in the circumferential direction.

  Moreover, in the above-described lighting apparatus, it is preferable that the fan is disposed above the light source.

  Furthermore, in the above-described lighting fixture, it is preferable that a convex portion protruding into the gap is provided on at least one of the lamp body and the cover.

  Moreover, in the above-described lighting apparatus, it is preferable that the cover has a protection unit that is positioned above the fan and protects the fan from dust.

  According to the present invention, since the airflow flowing from the lower side of the fan flows out from the upper side of the fan, the airflow resistance is suppressed as compared with the case where both the inflow and outflow of the airflow are performed on the lower side of the fan. Thus, the efficiency of air cooling can be increased.

It is sectional drawing which shows embodiment of this invention. (A) and (b) show the same as above, (a) is a front view, and (b) is a plan view. It is sectional drawing which shows the example of a change same as the above. (A) (b) shows another example of a change same as the above, respectively (a) is sectional drawing, (b) is a top view. It is sectional drawing which shows another example of a change same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the present embodiment includes a lamp body 1 that holds a light emitting diode 11 as an electrical light source and is embedded in an embedded hole 20 provided in a ceiling material 2. Hereinafter, the upper, lower, left and right will be described with reference to FIG.

  The lamp body 1 has a bottomed cylindrical shape with an open bottom surface, and a main body 13 having a printed wiring board 12 on which a light emitting diode 11 is mounted fixed to an inner bottom surface. The light of the light emitting diode 11 is emitted downward through the opening on the lower surface of the main body 13.

  As shown in FIG. 2, a plurality of (16 in FIG. 2) radiating fins 14 each having a thickness direction in the circumferential direction of the main body 13 are provided on the outer peripheral surface of the lamp body 1. Are juxtaposed in the circumferential direction. In the lamp body 1, the members interposed between the light emitting diodes 11 and the radiation fins 14 and the radiation fins 14 themselves are preferably made of a material having as high a thermal conductivity as possible. In order to achieve uniform heat dissipation, it is desirable that the heat dissipating fins 14 be arranged at equal intervals in the circumferential direction of the lamp body 1.

  Further, the present embodiment includes a cover 3 that forms a gap having openings at both upper and lower ends between the outer surface of the lamp body 1 and a fan 4 that generates an upward airflow in the gap.

  The cover 3 includes a cylindrical tube portion 31 that surrounds the entire periphery of the lamp body 1 and a cover portion 32 that exposes the fan 4 upward and covers the upper side of the lamp body 1. The lower end of the cover 3 (that is, the lower end of the cylindrical portion 31) is located above the lower end of the lamp body 1, and the fan 4 extends from the lower side of the cover 3 between the inner surface of the cover 3 and the outer surface of the lamp body 1. A gap is formed over As the material of the cover 3 as described above, for example, synthetic resin or metal can be used.

  The fan 4 is fixed to the lamp body 1 with the rotation axis aligned with the central axis of the lamp body 1 above the lamp body 1. When viewed from above, the fan 4 is located in the upper opening of the cover 3 (that is, the upper opening of the gap). A power supply circuit (not shown) that generates power for the light emitting diode 11 and the fan 4 may be housed in the lamp body 1 or may be disposed outside the cover 3.

  The fan 4 is driven in a direction that generates an upward airflow.

  Further, in the lamp body 1, a conical airflow guiding portion 15 that is coaxial with the main body portion 13 protrudes below the fan 4.

  According to the above configuration, as shown by the arrow in FIG. 1, the airflow that flows in from the lower side of the fan 4 flows out from the upper side of the fan, so that both inflow and outflow of the airflow are performed on the lower side. Compared with air resistance, air cooling efficiency is improved.

  In addition, the horizontal airflow from the outer periphery of the main body 13 toward the central axis of the main body 13 on the lower side of the fan 4 bends upward by hitting the airflow guide 15 and is guided to the fan 4. Thereby, compared with the case where the airflow guidance part 15 is not provided, ventilation resistance is suppressed and the efficiency of air cooling is improved.

  Further, in the present embodiment, the heat radiating fins 14 are extended upward to the vertical position aligned with the fan 4 in the horizontal direction. Thereby, compared with the case where each radiation fin 14 is located only below the fan 4, heat dissipation is improved.

  Moreover, in this embodiment, the fan 4 is arrange | positioned above the light emitting diode 11 which is a light source and a heat source. Thereby, compared with the case where the fan 4 is separated from the light emitting diode 11 in the horizontal direction, the efficiency of air cooling is improved.

  Here, when dust sucked in the airflow is collected on the fan 4, the noise generated by the fan 4 may increase or the operation of the fan 4 may be hindered. In the present embodiment, since the airflow flows from below, dust is less likely to be sucked than when the airflow flows from above. Further, as shown in FIG. 3, convex portions 16 that protrude into the air flow channel may be provided on each of the radiating fins 14 so that the dust does not easily reach the fan 4. If this configuration is adopted, it is considered that a vortex is generated around the convex portion 16, whereby the dust easily falls before reaching the fan 4. In the example of FIG. 3, the convex portion 16 has a flat shape with the thickness direction directed in the vertical direction, but the shape of the convex portion 16 can be changed as appropriate. Moreover, you may provide the above convex parts 16 in the main-body part 13 and the cover 3 of the lamp body 1. FIG.

  Also, the above-described problem may occur due to dust falling from above while the fan 4 is stopped. Therefore, a protection unit that protects the fan 4 from falling dust may be provided. As such a protection part, it is possible to provide the cover 3 with the net | network 33 as shown in FIG. 4, and the roof part 34 as shown in FIG.

  In the example of FIG. 4, the mesh 33 is supported on the upper side of the fan 4 by a cylindrical support portion 35 protruding above the cylinder portion 31, and dust accumulated on the mesh 33 is blown to some extent when the fan 4 is operating. It is.

  In the example of FIG. 5, the roof portion 34 is supported on the upper side of the fan 4 by a support portion 36 protruding above the cylindrical portion 31. In the example of FIG. 5, the support portion 36 has, for example, a large number of through holes and the like and allows airflow to pass therethrough, and the airflow of the fan 4 flows horizontally through the through holes and the like of the support portion 36 as indicated by arrows. To do. In this case, in order to suppress the airflow resistance, the roof portion 34 has a V-shaped or conical shape in which the central portion located above the fan 4 projects downward from the end portion close to the airflow outlet. It is desirable.

DESCRIPTION OF SYMBOLS 1 Lamp body 2 Ceiling material 3 Cover 4 Fan 11 Light emitting diode (light source)
13 Body 14 Radiating fin 16 Convex 33 Net (Protective part)
34 Roof (Protection)

Claims (6)

A lamp body having an electric light source held in a direction in which light is emitted downward and having a plurality of heat dissipating fins projecting from an outer surface of the main body section embedded in a ceiling material;
A cover for forming a gap between the upper and lower ends of the lamp body and the outer surface of the lamp body;
E Bei and a fan for generating an upward airflow is disposed in said gap,
An illuminating device characterized in that an airflow guiding portion for guiding an airflow in a horizontal direction upward is provided below the fan . The lighting apparatus according to claim 1, wherein the fan is disposed on the upper side of the lamp body, and the radiating fins are extended to a vertical position aligned in a horizontal direction with respect to the fan. The lighting apparatus according to claim 1, wherein the main body portion has a bottomed cylindrical shape, and the heat dissipating fins protrude from the outer peripheral surface of the main body portion at equal intervals in the circumferential direction. . The said fan is arrange | positioned above the said light source, The lighting fixture of any one of Claims 1-3 characterized by the above-mentioned. The luminaire according to any one of claims 1 to 4, wherein a convex portion protruding into the gap is provided on at least one of the lamp body and the cover. The lighting apparatus according to claim 1, wherein the cover includes a protection unit that is positioned above the fan and protects the fan from dust.

Images