Detailed explanation of whether the surface of the electric heating tube is electrified and blackening. We all know the role of electric heating tubes and heating tubes as heating elements, that is, the electric heating tubes will be heated by high-power voltage after being energized. Our common electric heating rods, which heat quickly, are the working principle. So why the electric heating tubes we use are not conductive, and the surface of some electric heating tubes will become dark. The following editor explains in detail.
Electric heating tube structure: The electric heating tube is a metal tubular electric heating element. Its structure is very simple. The spiral heating wire is located in the center of the tube. The heating wire and the metal sheath are tightly filled with dense insulating and heat-conducting fillers. The pipe mouth is sealed with sealing material, and the pipe end is led out with a conductive lead rod for wiring.
Through the above analysis, it can be known that the metal shell of the heating tube and the heating alloy wire will be filled with magnesium oxide powder with good insulation and thermal conductivity. Therefore, the electric heating alloy wire is charged. If the insulating magnesium oxide powder is not filled in the middle, the surface of the electric heating tube will definitely be charged.
Therefore, the surface of the electric heating tube is not charged. The main reason is that the tube is filled with insulating fillers, generally high-purity magnesium oxide powder.
The reason for the blackening of the surface of the electric heating tube:
1. First of all, it may be because the electric heating tube itself has been burned out, so the surface will be blackened. If this is the case, everyone should pay attention and do not continue to use this product.
2, it may be caused by poor contact of the controller contact point, poor contact between the power cord plug and the electric heating socket.
3. It may be caused by abnormal power supply or frequent power outages. The electric heating tube in use may become black due to repeated power outages or abnormal power supply that affects normal use.
4. Oxidation caused by energized heating. After the electric heating tube is energized and heated for a period of time, due to the influence of air or humid environment, the surface will produce some black objects due to oxidation, just like when burning stainless steel with the flame of a candle. A layer of black substance will be produced on its surface. This situation is relatively common, and this black oxide is non-toxic, and the electric heating tube can continue to be used.
High temperature blackened electric heating tube
The detailed explanation of whether the surface of the electric heating tube is electrified and blackening is here. When the surface of the electric heating tube is heated for a period of time, the surface becomes black. We have to determine what caused it. One of our products is called high-temperature blackening electric heating tube, which is contrary to the above statement. The above-mentioned electric heating tube will turn itself black after heating at high temperature. This phenomenon is normal. It is different from the ordinary electric heating tube. If the ordinary electric heating tube still has the resistance value, it can work because it is only caused by oxidation; if there is no resistance value, it should be burned out. At this time, the electric heating tube has a very high risk factor and may appear. If the leakage occurs, the power supply to the heating tube should be stopped in time.