The process of the tungsten halogen cycle is such that, under appropriate temperature conditions, the tungsten evaporated from the filament reacts with the halogen species in the cell wall region to form a volatile halo-tungsten compound. Since the bubble wall temperature is sufficiently high (250 ° C), the tungsten halogen compound is in a gaseous state, and when the tungsten halogen compound diffuses to the area around the hot filament, it is differentiated into halogen and tungsten. The released tungsten portion is returned to the filament and the halogen continues to participate in the cycling process.
Fluorine, chlorine, bromine, and iodine can produce a tungsten regeneration cycle. The main difference between them is that the temperature required for the cyclic reaction and the degree of interaction with other substances in the lamp are now different. Now, various tungsten-bromide lamps and iodine-tungsten lamps are mass-produced, and some lamps are partially recycled with chlorine. Agent.
In order to make the halide formed at the wall of the lamp in a gaseous state, the wall temperature of the tungsten halogen lamp is much higher than that of an ordinary incandescent lamp. Accordingly, the size of the bulb of the tungsten halogen lamp is much smaller, and high temperature resistant quartz glass or hard glass must be used. Due to the small size and high strength of the glass bulb, the allowable air pressure in the lamp is high, and the working temperature is high, so the working pressure inside the lamp is much higher than that of the ordinary gas bulb. Since the evaporation of tungsten in the tungsten halogen lamp is more strongly suppressed, and the tungsten halogen cycle eliminates the blackening of the bulb, the working temperature and the light effect of the filament can be greatly improved, and the life of the lamp is also extended accordingly.
The tungsten halogen lamp is divided into two types: the main high-voltage tungsten halogen lamp (which can be directly connected to the 220V-240V power supply) and the low-voltage tungsten halogen lamp (with the corresponding transformer). The low-voltage tungsten halogen lamp has a relatively long life and safety performance. Etc.
The secret of choosing a tungsten halogen lamp: the color temperature, life, safety and UV isolation of the lamp.
A halogen lamp is a halogen lamp filled with a halogen element or a halide such as bromine iodine, which is called a halogen lamp or a tungsten halogen lamp. It is a new generation of incandescent lamps.
In order to improve the luminous efficiency of the incandescent lamp, it is necessary to increase the temperature of the tungsten wire, but correspondingly, the evaporation of the tungsten is caused, and the glass bulb is blackened.
The incandescent lamp is filled with a halogen element or a halide, and the principle of the tungsten halogen cycle can eliminate the blackening of the bulb of the incandescent lamp. This is the reason for the halogen lamp.
However, in order to ensure the normal operation of the tungsten halogen cycle, the size of the glass envelope must be greatly reduced to increase the temperature of the glass envelope (generally, the glass bulb temperature of the iodine tungsten lamp is 250-600 ° C, and the glass bulb temperature of the bromine tungsten lamp is 200-1100 ° C. ), the tungsten halide in the lamp is in a gaseous state. Therefore, the glass bulb of the halogen lamp must use quartz glass with high temperature resistance and high mechanical strength.
Its structure has a double-ended straight tube shape, a single-ended cylindrical shape and a reflective shape. Since quartz glass is used as the glass bulb, the halogen lamp is often called a quartz lamp. Among them, the reflective halogen lamp is often called a cup lamp because it has a reflecting cup.
The tungsten halogen lamp has various powers such as 5W, 10W, 15W, 20W, 25W, 30W, 35W, 40W, 45W, 50W, 60W, 70W, 100W, 150W, 200W and 250W. Operating voltages are 6V, 12V, 24V, 28V, 110V and 220V. The lamp cap has screw type (E10, E11, E14, etc.), plug-in type (GU5.3, GX5.3, GY6.35, GZ4 and G8, etc.) and direct lead-out type. The cup lamp also has a front cover and no front cover. The diameter of the cup mouth is 25mm (MR8), 35mm (MR11) and 50 mm (MR16). The reflection angles are various such as 8°, 10°, 12°, 20°, 24°, 30°, 36°, 40°, and 60°.
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