1. The real heat of the electric heating tube is also the heating wire placed inside the heating tube. The heating wire uses a high-resistance alloy wire, called an electric alloy, and the commonly used heating wire generally has a resistance of a few ohms to tens of ohms.
2. Because the heating wire conducts electricity, when directly heated with an exposed heating wire, only insulating things such as air can be heated, at least with insulation measures such as ceramics or a certain air gap to separate from the conductor. The inside of the electric heating tube is filled with insulation material between the heating wire and the metal pipe wall, so the electric heating tube can heat the conductor and the non-conductor.
Generally speaking, electric hot water bottles are divided into three types: electrode type, heating wire type, and electric heating tube type. Among them, the heating metal materials used in the latter two electric hot water bottles will not rust, and the liquid will not be charged.
The electrode type is easy to rust, and when the rust enters the liquid, it will lead to a decrease in the resistance of the liquid, resulting in an increase in heating power and then an increase in temperature. At this time, if the temperature controller fails, the liquid will explode due to gasification after exceeding 100°.
You can tell by touching it by hand: the heating wire or electric heating tube warm water treasure is a mesh wire structure or a U-shaped tube structure, while the electrode warm water treasure can generally touch two metal electrodes.