JPS633055Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a downlight that is embedded in the ceiling of an unventilated attic of a house, for example.

In general, this type of downlight has a cylindrical frame with an open bottom and has multiple heat radiation holes in the upper outer periphery, and the air heated by the incandescent lamp is emitted from the heat radiation holes into the ceiling. It tries to keep its own temperature below a certain value. However, with this configuration, the heated air discharged from the heat radiation holes mixes with the cold air in the attic, and the water vapor contained in the air condenses to form condensation. This condensation can cause stains and mold, and also It has been difficult to prevent condensation from adhering to the metal surfaces of downlight housings and causing corrosion.

The purpose of this invention is to allow heated air to flow indoors without being discharged to the ceiling, to prevent condensation from forming in the ceiling, and to suppress the temperature rise of the downlight itself. Its features include a cylindrical outer case with an opening at the bottom that is installed embedded in the ceiling, and a cylindrical inner case with an opening at the bottom that is installed across the space that forms the air flow path within this outer case and is equipped with a light source. The inner case is provided with a ventilation hole that communicates with the air flow path.

An embodiment of the present invention will be described below based on the drawings. A cylindrical outer case 1 with an open bottom end is installed in an opening Wa in a ceiling plate W in a recessed manner. That is, the flange 1a provided at the lower opening edge of the outer case contacts the lower surface of the opening edge of the ceiling plate W, and the lower ends of the plurality of support plates 3 whose upper ends are attached to the outer case with thumb screws 2 are connected to the ceiling plate W. The outer case is attached to the ceiling board W by pressing it from the top.

A cylindrical inner case 5 whose lower end is open is attached to the inner circumference of the outer case 1 with an air flow path 4 in between. How to install the inner case:
In the illustrated example, the top plate of the inner case is placed against a fixture 6 fixed to the top plate surface of the outer case 1 by welding or the like, and is fixed to the fixture by tightening screws 7 from below. A plurality of ventilation holes 8 are provided at regular intervals on the upper peripheral surface of the inner case 5, and the inside of the inner case and the air flow path 4 are communicated through the ventilation holes. In addition, on the lower surface of the top plate of the inner case 5, there is a socket 1 electrically connected to a terminal block 9 fixed to the upper surface of the top plate of the outer case 1.
0 is attached, and an incandescent lamp 11, for example, is attached to this socket as a light source. Incandescent lamp 11
A cylindrical buttful 12 having an uneven surface 12a is provided so as to surround the periphery. This buttful is supported by engaging the flange portion 12b provided at the lower opening edge of the inner case 5 with the frame 5a at the lower opening edge of the inner case 5, and pressing the outer peripheral surface with a spring plate 13 attached to the inner case. There is. 14 is a spacer for stabilizing the inner case 5.

In the downlight configured in this way, indoor air flowing into the interior from the lower end opening of the inner case 5,
As shown by the arrow shown by the solid line, the air flows from the upper ventilation hole 8 into the air flow path 4 between the outer case 1 and the inner case, descends through this flow path, and is discharged indoors from the lower end opening of the outer case. A convection action takes place. Due to the heat dissipation effect of the large outer case 1, heating of the downlight body can be suppressed to below a certain temperature. Then, air convection occurs, heated air is not released into the attic, and the air in the attic is cut off and does not come into contact with the cold air in the attic, so no condensation occurs in the attic.

As explained above, this invention enables convection to circulate indoor air back into the room without discharging it into the ceiling, thereby preventing dew condensation in the ceiling and causing stains due to condensation. There is no generation of mold or mildew, corrosion of the metal parts of the downlights can be suppressed, and the temperature of the downlights can be kept below a certain value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a downlight showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. 1...Outer case, 4...Air flow path, 5...Inner case, 8...Vent hole, 11...Incandescent lamp, 12...
Batsuful, W...Ceiling board.

Claims (1)

[Scope of Claim for Utility Model Registration] A cylindrical outer case that is embedded and supported in the ceiling board and has only the lower end open among the upper and lower ends, and a cylindrical outer case that is installed with a gap that serves as an air flow passage inside the outer case, and the above-mentioned air flow It is equipped with a cylindrical inner case with a ventilation hole communicating with the air passageway and an open bottom end, and a light source installed inside this inner case, and the lower end of the air flow passageway on the lower end opening side of both the inner and outer cases is open. A downlight that is characterized by: