JPH11250731A - Dew condensation preventing device for ceiling luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dew condensation preventing device preventing overheat of a heating part of a ceiling luminaire. SOLUTION: A box 3 forming shielded space and wound with heat insulators 2 is set in the backside of the ceiling luminaire 1, and an intake vent 4 and an exhaust fan 5 are provided in the box 3 to generate air flow within the box 3, consequently dew condensation caused by residence of warm air within the cold luminaire 1 is prevented, also the heat of a heating part of the luminaire 1 is dissipated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing dew condensation on a ceiling lighting device.

[0002]

2. Description of the Related Art Lighting equipment for ceilings, such as low-temperature rooms and constant temperature clean rooms, is cooled by cold air inside the room. Since this condensation causes a short circuit, conventionally, a heat insulating material is wrapped around the back side of the lighting fixture to prevent the condensation. This heat insulating material also has a role of securing heat insulation between the room and the ceiling above the ceiling lighting fixture mounting portion.

[0003]

In the above-described conventional method for preventing dew condensation, the heat insulating material wound around the luminaire prevents the heat from dissipating. However, there is a problem that a fire occurs due to burning.

[0004] In addition, when the lighting equipment breaks down, it is necessary to remove the wound heat insulating material and perform repairs such as replacement of parts, which is very troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dew condensation preventing device in which a heating portion of a ceiling lighting device does not overheat.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a dew condensation preventing device for a ceiling lighting device according to the present invention has a heat insulating structure in which a lower portion is opened and a shielding space is formed on the back side of the ceiling lighting device. The configuration adopts a configuration in which an intake hole and an exhaust fan are provided separately from each other at both ends of the box.

[0007] That is, an insulating box forming a shielded space is arranged on the back side of a ceiling lighting device, and an air flow is generated in the insulating box by an intake hole and an exhaust fan, so that a cold lighting device is heated. This prevents the stagnation of air and dew condensation, and dissipates the heat of the heating part of the lighting fixture. The reason why the shielded space is formed by the heat insulating box is to secure heat insulation between the room and the ceiling.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the present invention will be described. FIG. 1 is a longitudinal sectional view showing a state in which a dew condensation preventing device is attached to a ceiling lighting device 1, and FIG. 2 is a transverse sectional view thereof. This dew condensation preventing device basically includes a box 3 made of a steel sheet around which a heat insulating material 2 is wound, and an intake hole 4 and an exhaust fan 5 respectively attached to opposing side walls of the box 3.

The box 3 is open downward and is installed on a heat-insulated ceiling panel 6 in which the ceiling lighting fixture 1 is fitted so as to cover the back side of the lighting fixture 1. The ceiling lighting fixture 1 and the box 3 are suspended from the ceiling structure by resin insulation bolts 7 and can be easily removed.

[0010] A backflow prevention damper is attached to the intake hole 4 and the exhaust fan 5, and when the exhaust fan 5 is operated, as shown by an arrow in FIG. Air flow occurs. Case 8
, Heat generated in the mounting portion of the ballast 9 and the fluorescent lamp 10 is also dissipated.

A temperature sensor 1 is provided inside the box 3.
1 is also attached. If the temperature inside the box 3 rises abnormally due to a failure of the exhaust fan 5, etc., the temperature sensor 1
The lighting device 1 is turned off by a relay switch connected to the lighting device 1.

[0012]

As described above, the apparatus for preventing dew condensation of a ceiling lighting device according to the present invention has a heat insulating box which forms a shielded space on the back side of the ceiling lighting device. Since a fan is provided to generate a flow of air in the shielded space, it is possible to prevent warm air from staying in a cold lighting fixture and forming dew,
The heat of the heating part of the lighting equipment can be dissipated, so that it is not necessary to remove the heat insulating material during maintenance and repair of the lighting equipment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an attached state of a dew condensation preventing device of an embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Insulation material 3 Box 4 Intake hole 5 Exhaust fan 6 Ceiling panel 7 Bolt 8 Case 9 Ballast 10 Fluorescent lamp 11 Temperature sensor

Claims (1)

[Claims] 1. A device for preventing dew condensation on a ceiling lighting device, wherein an intake hole and an exhaust fan are provided at both ends of a heat insulating box which is open at the bottom and forms a shielded space on the back side of the ceiling lighting device. .