JPS5847676Y2 - Heat-responsive fluorescent lamp equipment for low temperatures - Google Patents

Description

[Detailed explanation of the invention] This invention uses highly efficient fluorescent lamps as the main lighting in low-temperature fluorescent lighting equipment such as freezer compartments, and automatically switches on incandescent bulbs when the freezer compartment reaches room temperature. This invention relates to a low-temperature heat-responsive fluorescent lamp that can be switched on and off and can be adapted to a wide range of ambient temperatures.

Conventionally, incandescent light bulbs have been used for lighting in freezer compartments, but incandescent light bulbs consume more power than fluorescent lamps and are disadvantageous in terms of energy conservation, so it is also necessary to reduce the refrigeration load. Fluorescent lamps have come to be mainly used because they are very advantageous for this purpose.

However, when fluorescent lamps are at low temperatures, they do not start, and even when they do turn on, there are many flickers, and the luminous flux is extremely small.As a result, fluorescent lamps cannot be used as lighting equipment for freezer compartments. There were various problems.

Therefore, in the past, in order to seal the appliance and improve the heat retention inside the appliance, a heat insulating material was pasted on the inside of the appliance, and as an electric circuit, a fluorescent lamp 1, as shown in Fig. 1,
A ballast 2 is connected in series, a glow starter 3 is connected in parallel to the fluorescent lamp 1, and this circuit also includes a temperature switch 4 to compensate for the low temperature characteristics of the fluorescent lamp 1 and an incandescent bulb. The series circuit with 5 was connected in parallel to illuminate the freezer compartment.

The lighting equipment for the freezer compartment configured as described above has a low temperature inside the equipment when the power is turned on, so the fluorescent lamp 1 is turned off.
is not lit, and the incandescent light bulb 5 is lit.

When the temperature inside the appliance gradually rises due to the heat generated by the incandescent bulb 5, the fluorescent lamp 1 changes from a slight discharge to normal lighting.

At this time, both the fluorescent lamp 1 and the incandescent lamp 5 are lit.

Further, as the temperature inside the device further increases, the luminous flux of the fluorescent lamp 1 increases, and at the same time, the temperature inside the device also increases.

When the internal temperature of the appliance reaches the temperature set in the temperature switch 4, the temperature switch 4 is automatically turned off, the incandescent light bulb 5 is turned off, and only the fluorescent lamp 1 is turned on.

However, lighting equipment is not always turned on at freezing temperatures, and is often turned on at room temperature when cleaning, inspecting, or repairing the inside of a freezing room.

In such cases, the ballast may become overheated, shortening its lifespan, and leaving it on for a long time at room temperature may cause the ballast to burn out. However, there were drawbacks such as the need to install a separate light source.

This idea was made to eliminate the above-mentioned drawbacks, and when the lighting equipment is turned on at room temperature with the freezer turned off, such as when cleaning and inspecting the freezer compartment, the temperature inside the equipment is detected and the lighting is turned on. The purpose of the present invention is to provide a low-temperature heat-responsive fluorescent lamp fixture that automatically switches from lighting a light lamp to lighting an incandescent bulb and can safely and economically adapt to a wide range of ambient temperatures.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 2 is a circuit diagram showing an example of a low-temperature thermally responsive fluorescent lamp apparatus according to this invention, in which a fluorescent lamp 1 and a ballast 2 are connected in series, and the fluorescent lamp 1 has a glow starter 3.
are connected in parallel, and the series circuit of the fluorescent lamp 1 and the ballast 2 is connected to the power supply terminals t1. through the break contact side of the changeover temperature switch 6. It is connected in parallel to t2.

In addition, the power terminal t1. At t2, a series circuit of a temperature switch 4 and an incandescent bulb 5 is connected in parallel to compensate for the low temperature characteristics of the fluorescent lamp 1, and the connection point a between the temperature switch 4 and the incandescent bulb 5 is at the above switching temperature. It is connected to the make contact m of the switch 6.

FIG. 3 shows an example of a fluorescent light fixture that accommodates the circuit components shown in FIG.
is attached, and an elastic backing 11 is attached to the lower surface of the outer peripheral edge of the base 9, and a support member 12 is provided inside the base 9, so that a fluorescent lamp is connected as shown in FIG. 1, ballast 2, glow starter 3, temperature switch 4,
An incandescent light bulb 5 and a switching temperature switch 6 are each attached.

Further, the front surface of the base 9 on which the lighting components are attached is hermetically covered by a cover 13 made of a translucent resin that is bonded to the gasket 11, and the cover 13 is also attached to the base 9. It is fixed in an airtight state by a mounting spring 14 provided at.

In the low-temperature fluorescent lamp configured as described above, the power terminal 1. ．． When 100V power is supplied to the switch 12, the current flows through the break contact b of the changeover temperature switch 6, the ballast 2, and the fluorescent lamp 1, but because the temperature inside the device is low, the fluorescent lamp 1 is normal. It does not light up and is in a slight discharge state.

On the other hand, current also flows through the temperature switch 4 to the circuit of the incandescent light bulb 5, causing the incandescent light bulb 5 to light up.

When the internal temperature of the appliance gradually rises due to the heat generated by the incandescent bulb 5, the fluorescent lamp 1 shifts from slight discharge to normal lighting.

If the temperature inside the appliance further rises in this state, the luminous flux of the fluorescent lamp 1 increases, and when the temperature inside the appliance rises further and reaches 10 degrees Celsius or higher than the temperature set by the temperature switch 4, the temperature switch 4 automatically switches off. The incandescent light bulb 5 is turned off.

In addition, when the freezer compartment reaches around normal temperature due to stopping of the refrigerator, the temperature inside the appliance increases accordingly, and the temperature reaches +20°C or more set by the changeover temperature switch 6, the changeover temperature switch 6 is activated and switches to the make contact m side, interrupting the circuit of the fluorescent lamp 1 and turning off the fluorescent lamp 1. At the same time, the switching temperature switch 6 closes the circuit of the incandescent lamp 5, and the fluorescent lamp 1 is turned off. The incandescent light bulb 5 is turned on instead.

Figure 4 shows another embodiment of this invention, in which a series circuit of a fluorescent lamp 1 and a ballast 2 is connected to a temperature switch 7 (+20°C).
The power supply terminal 1. ．． 1
Furthermore, the excitation coil 8a of the relay 8 is connected in parallel to the series circuit of the fluorescent lamp 1 and the ballast 2, and the relay contact 8b, which is turned off when the excitation coil 8 is energized, is connected to the incandescent lamp 5. It is connected in parallel to the temperature switch 4 that opens and closes the power supply circuit.

In this embodiment, when the temperature switch 7 is turned off, the relay 8 is deenergized, so that the relay contact 8b is turned on and the incandescent light bulb 5 is turned on.

As described above, according to this invention, a temperature switch is added that operates when the freezer reaches room temperature, and at the same time the fluorescent lamp circuit is cut off and only the incandescent lamp is turned on automatically. There is no risk of burning out the ballast like in the past, and there is no need for a separate light source.
Low temperature fluorescent lamp fixtures can be safely and economically adapted to a wide range of ambient temperatures.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional low-temperature heat-responsive fluorescent lamp, Fig. 2 is a circuit diagram showing an example of a low-temperature heat-responsive fluorescent lamp according to this invention, and Fig. 3 is a circuit diagram of a low-temperature heat-responsive fluorescent lamp according to this invention. FIG. 4 is a longitudinal cross-sectional side view of the fluorescent lamp device, and is a circuit diagram of a thermally responsive fluorescent lamp device for low temperatures showing another example of this invention.

Claims (1)

[Scope of utility model registration request] A fluorescent lamp in which an incandescent bulb lights up when the temperature is low, a fluorescent lamp lights up when the internal temperature of the appliance rises, and the incandescent bulb turns off when the internal temperature of the appliance reaches a set temperature. In the appliance, a temperature switch means that turns off at around room temperature is connected in series to the power supply circuit of the fluorescent lamp, and the temperature switch means opens the power supply circuit of the fluorescent lamp and simultaneously closes the power supply circuit of the incandescent lamp. A heat-responsive fluorescent lamp for low temperature use.