I believe that users who use electric heating rods or electric boilers often experience heating tube burnout. Although this is common, many users are still very distressed whenever it happens. Therefore, users will ask us what is the reason why the heating tube always burns out? Don't worry, let's go into detail.
The first is the voltage problem. Unstable voltage can easily lead to power changes and combustion of heating tubes. Therefore, it is recommended to use three-phase electricity for large electric boilers, because three-phase electricity is industrial electricity and is more stable than household electricity. In addition, due to the power problem, the power of the ordinary mold heating tube should not be too large. The normal surface load is about 5W/cm2, and the surface load of the inlet heating tube is about 12W/cm2. The greater the surface load above the standard mold heating tube, the shorter the service life.
The second is the quality problem, the reason of the heating tube itself will also lead to combustion, because the workload of large electric boilers is very large, it is recommended to use high-quality heating tubes, our lion-like hardware tools heating tubes are very suitable.
Then there is the water level problem, because the water in the heating system will evaporate, the longer the time, the more evaporation, if you do not pay attention to the alarm water level, resulting in the water level is too low, the heating tube will burn dry, the heating tube is easy to burn out, so either pay attention to the water level, or choose dry burning heating tube.
In addition, impurities are also the cause of damage to the heating tube. If unfiltered water is frequently added to the electric heating system, some impurities will inevitably adhere to the heating tube. Over time, a layer of dirt forms on the surface of the heating tube, causing the heating tube to burn out.
There is also the problem of cleaning, if the electric boiler is not cleaned frequently, impurities will appear, and it is reasonable for the heating tube to burn out.
Finally, there is a problem with the gap between the heating tube and the mold because the air hinders the heat conduction. If the internal temperature and heat of the heating tube cannot be released, the surface temperature of the electric heating tube will increase, and the internal temperature of the heating tube will also increase. When the internal temperature of the mold electric heating tube is high to a certain extent, it will burn out the resistance wire, shorten the service life of the mold heating tube, and more seriously, the pipe will explode, so the gap between the heating tube and the mold cannot be too large. However, the gap between them should not be too small, because the mold heating tube will expand due to the principle of thermal expansion and cold contraction after installation and power-on, and many molds cannot be taken out when the heating tube is damaged. Therefore, it is generally recommended that when buying a mold heating tube, the gap between the mold hole and the diameter of the heating tube is 0.1-0.2mm, which is very suitable.