JPH0347577Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a lighting control device for a fluorescent lamp for illumination installed in a show case.

Conventional Structure and Problems Generally, a low-temperature fluorescent lamp is used to illuminate the interior of a housing case where the internal temperature is below 0°C. However, since these low-temperature fluorescent lamps are designed for use in low-temperature atmospheres, their lifespan at high temperatures is approximately 15% longer than at low temperatures.
It becomes shorter.

The conventional example is explained with reference to FIGS. 1 and 2. 1
1 is the main body of the dual refrigerating case, which is composed of an upper case 2, a lower case 3, and a machine room 4. The upper case 2 consists of an outer box 5, an inner box 6, a door 7 made of glass, and a heat insulating material 8. In the freezer compartment 9 of the upper case 2, a cooler 10 is installed in the inner box 6.
It is installed on the Moreover, the cooler 10
An electric motor 1 for stirring the inside of the refrigerator is attached to the inner box 6 at the upper part thereof. Reference numeral 12 denotes a low-temperature fluorescent lamp for illuminating the inside of the refrigerator, and is connected to the inner box 6 above the rear side of the door. In addition, the lower case 3 includes an outer box 13, an inner box 15 equipped with a cooling pipe 14, and a door 6.
and a heat insulating material 17. A compressor 18 for the upper case is placed in the machine room 14 facing the compressor 19 for the lower case. 20 is each condenser.

21 is a thermostat with a notch, which turns off the power circuit of the compressor 18 at a predetermined temperature and can also be turned off manually. The lower case compressor 19 is independent from the upper case 2 both system-wise and circuit-wise, and is not related to the present invention, so a detailed explanation will be omitted.

Since the main purpose of this kind of device is to store ice cream, the user should not store the ice cream and turn on the thermostat of the upper case 2 during seasons such as winter when ice cream sales are low. 21 is turned off,
In order to enhance the display effect as a mere display case,
Low-temperature fluorescent lights are used for lighting. However, the low-temperature fluorescent lamp 12 used as interior illumination is often used under high-temperature atmospheric conditions, and as a result, the life of the low-temperature fluorescent lamp quickly deteriorates.

Purpose of the invention The present invention eliminates the above-mentioned conventional drawbacks, and prevents the lifespan of low-temperature fluorescent lamps from decreasing by creating a structure that does not turn on unless the internal temperature of the freezer case reaches a certain level. .

Structure of the invention In order to achieve this purpose, the invention connects a bimetallic thermostat whose contacts close at low temperatures in series to the power supply circuit of a low-temperature fluorescent lamp, and connects the heat-sensitive part of the bimetallic thermostat to a cold air inlet or other low-temperature outlet inside the refrigerator. It is attached to the section.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4 of the drawings. Parts that are the same as those of the conventional example described above will be given the same numbers, detailed explanations thereof will be omitted, and different parts will be mainly explained. explain.

Reference numeral 22 is a bimetal thermostat whose contacts turn ON at temperatures below about -8°C and turn OFF at about 5°C, and is attached to the internal cold air suction port 23 of the upper case 2. The bimetal thermostat 2
2 is the ballast 2 of the low temperature fluorescent lamp 12 in terms of the electrical circuit.
It is connected in series to the power supply circuit No. 4.

Effects of the invention As described above, in this invention, the bimetal thermostat is connected in series with the power supply circuit of the ballast of the low-temperature fluorescent lamp, so the lamp does not turn on unless the ambient temperature of the low-temperature fluorescent lamp decreases. Since it is always lit under low temperature atmospheric conditions, it will not be lit under high temperature conditions when the dual-show case is installed, and the life of the low-temperature fluorescent lamp will be extended.

Furthermore, even when used as a display shelf by a user during the winter, the low-temperature fluorescent lamp will have a longer lifespan without being forced to turn on.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional dual show case, Fig. 2 is an electrical circuit diagram of a conventional example, Fig. 3 is a sectional view of a show case in an embodiment of the present invention, and Fig. 4 is a sectional view of the dual show case of the conventional example. FIG. 1... Show case, 12... Low temperature fluorescent lamp,
22...bimetal thermostat, 23...cold air inlet, 24...ballast.

Claims (1)

[Scope of utility model registration request] A show case in which a low-temperature fluorescent lamp for illumination is provided in the refrigerator, a bimetallic thermostat is installed at the cold air inlet in the refrigerator, and the bimetallic thermostat is connected in series to the power supply circuit of the ballast of the low-temperature fluorescent lamp. Lighting control equipment.