What does the Air heater have to do with?

The Air heater belongs to the range of electric heating tubes. Heating tubes used on the heated air include mold heating tubes, U-shaped heating tubes, finned heating tubes, and other shapes.

1. Mold heating tube

1) When using the mold heating tube, the diameter of the mold hole is 0.1-0.2mm larger than the diameter of the heating tube. Because air hinders the heat conduction of the heating tube, if the gap between the die hole diameter and the heating tube diameter is too large, the mold will not be able to absorb the heat from the heating tube in time, which will cause the surface of the mold heating tube The temperature rises and the internal temperature is too high, to a certain extent, the heating tube will expand, burst or the resistance wire will be burned, resulting in a short life of the mold heating tube.

2) Before designing the mold heating tube, determine the working temperature of the heating tube, and use the heating tube material suitable for the working temperature. And it is necessary to carry out certain temperature control to prevent the electric heating tube from being burnt out due to the high working temperature.

3). Some molds will vibrate when they are working, so the resistance wire of the mold single-head heating tube should be a nickel-chromium wire with better flexibility. Prevent the heating tube resistance wire from breaking due to vibration.

Summary: It can be seen from the above that the factors affecting the life of the Air heater are the relationship between the mold hole and the pipe diameter, as well as the temperature control and vibration.

2. Dry heating tubes such as U-shaped tubes and finned heating tubes

1). The power per meter of these heating tubes should be controlled at 1KW when the air is dry, and 1.5KW at most when the fan is circulating. If this standard is exceeded, the surface load of the heating tube is too large, so the surface temperature of the heating tube will be Increase the temperature, which will cause the internal temperature of the heating tube to be too high and burn out the resistance wire. In severe cases, the tube will expand and cause tube bursting, thereby reducing the service life of the heating tube.

2) Choose the appropriate Air heater material according to the working temperature. For example, if the working temperature of the oven is 600 degrees, you cannot use stainless steel 304 with a temperature resistance of 300-400 degrees, and you must use stainless steel 310s that can withstand a temperature of 700 degrees. And it is necessary to carry out certain temperature control to prevent the electric heating tube from being burnt out due to the high working temperature. If the appropriate material is not selected, or the temperature is not well controlled, the life of the heating tube will be shortened.

Summary: From the above, it can be seen that the factors that affect the life of the Air heater are the relationship between power and length, and the material of the heating tube.

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