What is the structure of the incandescent lamp? What is the reason for the blackening of the incandescent lamp?
The development trend of incandescent lamps is mainly to develop energy-saving bulbs. Incandescent lamps with different uses and requirements have different structures and components. It is precisely because of incandescent lamps that we can have light in the dark night. Incandescent lamps are one of the most widely used light sources in modern times. I believe everyone has discovered such a phenomenon. Incandescent lamps will turn black after a long time. , The composition of incandescent lamps
The development trend of incandescent lamps is mainly to develop energy-saving bulbs. Incandescent lamps with different uses and requirements have different structures and components. It is precisely because of incandescent lamps that we can have light in the dark night. Incandescent lamps are one of the most widely used light sources in modern times. I believe everyone has discovered such a phenomenon. Incandescent lamps will turn black after a long time. , What is the structure of the incandescent lamp? What is the reason for the blackening of the incandescent lamp?
What is the structure of the incandescent lamp
1. Glass bulb: The glass bulb is made into a spherical shape, and the material is heat-resistant glass, which isolates the filament from the air, which can transmit light and protect it. When the incandescent lamp is working, the temperature of the glass bulb can reach about 100°C.
2. Filament: It is made into a spiral shape with a tungsten wire that is much thinner than a hair. It seems that the filament is very short, but in fact, the extremely thin spiral tungsten filament is drawn into a straight line, which is more than 1 meter long.
3. Wire: The two wires are very simple on the surface, but they are actually composed of three parts: inner wire, Dumet wire and outer wire. The inner wire is used to conduct electricity and fix the filament. It is made of copper wire or nickel-plated iron wire; the short red metal wire in the middle is called Dumet wire, which is required to be closely combined with the glass without air leakage; the outer wire is copper wire, the task It is to connect the lamp holder to energize.
4. Sensing column: A horn-shaped glass part is the sensing column, which is connected to the glass bulb and serves as a fixed metal part. The exhaust pipe is used to suck the air out of the glass bulb, and then the lower end is welded and sealed so that the lamp does not leak.
5. Lamp holder: The lamp holder is a metal part that connects the lamp holder and the power source. It is bonded with the glass bulb with soldering mud.
What is the reason for the blackening of the incandescent lamp
1. The temperature of the filament of a light is about 3000 degrees. Because of the high temperature, the incandescent filament will produce light radiation, sending light to people. Under the effect of high temperature, a part of the incandescent lamp will automatically convert into heat energy, and the internal tungsten filament When it encounters heat, it sublimates into gas, and when it encounters cold bulbs in the process of outward diffusion, when encounters condensation, the inner wall of the incandescent lamp will turn black.
2. Due to the physical reaction inside the bulb, the bulb becomes black and cannot be cleaned. The longer the time, the more and more black particles condense inside the bulb, until the tungsten filament evaporates and breaks, and normal lighting cannot be performed.
3. Modern incandescent lamps are much more elaborate. In order to prevent the metal tungsten wire from being oxidized by the chemical reaction with the air, the air in the glass bulb is generally extracted first, and then a certain inert gas is injected to reduce the heating of the metal tungsten wire. The tungsten filament evaporates and breaks, which can slow down the darkening of the bulb.
The above is the composition of the incandescent lamp and the reason for the blackening of the incandescent lamp. The whole content is briefly introduced here. I hope it will be helpful to everyone.
