2021-12-20
What is the role of magnesium oxide in the electric heating tube
2021-12-20
Magnesium oxide powder will not be unfamiliar to everyone or you. It plays a key role in electric heating tubes. But how much do you know about the effect of magnesium oxide powder and magnesium oxide powder? The electric heating tube is composed of a heating wire (electric heating tube), a metal material sheath and an insulating layer of magnesium oxide powder. The material at each stage is very critical. However, if the quality of the magnesium oxide powder is not good enough or the installation is not timely, Immediately endanger the service life of the electric heating tube. How to properly install the magnesium oxide powder in the electric heating tube, and can produce the high-quality quality of the electric heating tube faster.
1) Standard of magnesium oxide in electric heating tube:
1. Magnesium oxide powder is located between the heating wire and the wall thickness to heat the insulating layer between the wire and the wall thickness. At the same time, magnesium oxide powder has excellent heat transfer performance. However, magnesium oxide powder has strong water absorption, so it has to be water-proof when used (magnesium oxide powder modified material or electric heating tube sealing solution).
2. Magnesium oxide powder can be divided into two types: ultra-low temperature powder and high temperature powder according to the adopted temperature range. Ultralow temperature powder can only be used below 400℃, and it is generally magnesium oxide powder that has been solved by modified materials.
3. Magnesium oxide powder is granular, and the magnesium oxide powder used for the electric heating tube is made of magnesium oxide powder particles of different sizes according to a certain proportion (screen mesh ratio).
2) Selection of voltage and basic voltage
The basic voltage specifications and models of electric heating tubes: 24V, 36V, 48V, 110V, 220V, 380V. Generally, the voltage that everyone refers to is the rated voltage. The rated voltage of the electric heating tube: the rated voltage of the electric heating tube refers to the voltage that is connected to the electric heating tube as required during the reformulation and marked on the shell of the electric heating tube. Or in other words, the rated voltage is the voltage that customers need to provide during the manufacturing process. Generally there are 24V, 48V, 110V, 220V, 380V and so on.
3) Common experiments and inspections of electric heating tubes
1. Resistor inspection, hot compression inspection, hot insulation inspection.
2. Output power inspection, thermal insulation layer inspection, thermal compression inspection, leakage current inspection.
3. Tidal test, salt spray test, life test and other structural mechanics experiments.
(Introduce in detail one of the most common ways to check the quality of the heating tube: first wipe the surface of the heating tube clean, then connect it to the AC 220V switching power supply, burn it in the air, turn off the power after the surface turns red, and wait for the heating tube to completely dissipate heat. , Wipe with a paper towel, the tissue should be free of gray and black air oxidation powder (not reflected with the O2 in the air), which indicates that this electric heating tube is a high-quality electric heating tube. Very simple.)