What is the structure and principle of the incandescent lamp?
Incandescent lamps are energized and heated filaments to incandescent state, which is still very common in life. When LEDs are not common, this kind of lamps is the main type in our lives, but many people may still not understand it, so incandescent What is the structure and principle of the lamp? Let’s take a look at BENWEI LIGHTING.
Incandescent lamp
What is the structure and principle of the incandescent lamp?
Incandescent lamp is a light source that converts electrical energy into light energy. The term incandescent comes from its light-emitting principle (see below). This kind of light source is cheap and simple in technology. It is often used in local lighting with low requirements. However, due to its power consumption and brightness limitations, it is gradually being replaced by new light sources such as energy-saving lamps and LED lamps in our life.
The glass bulb is generally made of transparent glass. In order to avoid filament glare, the glass bulb can be internally coated or frosted to form diffuse reflection of light. The number of transparent glass bulbs has gradually decreased. In order to enhance the luminous intensity in a certain direction, an aluminum reflective layer is also vapor-coated on the glass bulb. Some special purpose light bulbs use colored glass.
The filament is also called the incandescent body. It is the luminous body of the light bulb, which is usually made of single helix wire or double helix wire with tungsten. The tungsten wire is supported by the molybdenum wire bracket on the core column, and the two ends are connected with the guide wire. For safety, the outer guide wire of the high-voltage gas-filled incandescent lamp is also connected with a fuse. In order to improve the luminous efficiency of the filament, the air in the bulb is drawn out through the exhaust pipe in the stem, or it is evacuated and then filled with the required inert gas.
Incandescent lamp
The filament has the following basic requirements: ①High melting point temperature. The higher the melting point of the filament, the higher the light emitting efficiency of the bulb. ②The evaporation rate is small. Life of general filament
The incandescent lamp is composed of glass bulb, filament and lamp cap. The filament is made of tungsten filament with high melting point and not easy to evaporate. The low-power bulb is evacuated, and the high-power (greater than 40 watts) bulb is evacuated and filled with inert gas, such as argon, etc., the lamp cap , There are two kinds of socket type and screw type, the power of more than 300 watts of light bulbs, generally use the mouth lamp cap, because the screw type lamp cap is better than the socket type lamp holder in terms of electrical contact and heat dissipation.
In terms of the light-emitting principle of incandescent lamps, the editor of Jiuzheng Lighting Network understands that incandescent lamps use the thermal effect of the filament resistance current (electric energy is converted into heat), so that the temperature of the filament rises to incandescent level and emits light (heat energy is converted into light energy). The evaporation of the filament can easily produce deposits in the glass shell of the incandescent lamp and become black after long-term use, which reduces the light transmission performance and affects the luminous efficiency. Therefore, the luminous efficiency of the incandescent lamp is low.
There are many types of incandescent lamps. According to the working voltage, there are four types: 6, 12, 36, and 220 volts. Among them, 36 volts or less are low-voltage bulbs, which are used for local lighting and portable lighting. When installing incandescent bulbs, pay attention to the bulbs. The working voltage must be consistent with the line voltage. If the 36-volt bulb is connected to the 220-volt line by mistake, the voltage will be too high and the current flowing through the filament will be too large, which will cause the filament to burn out. On the contrary, if the 220-volt bulb is mistakenly connected Connecting to the 36-volt line, the light bulb will not emit light due to the low voltage.
Incandescent lamp
The above is an explanation of the knowledge of the structure and principle of the incandescent lamp. I believe you should have more understanding after reading it. The content is for your reference only, and I hope it can be helpful to you.
