What are the common factors for the failure of the air duct heaters?

The air duct heater is mainly used to heat the required air flow from the initial temperature to the required air temperature, up to 850 degrees centigrade. It has been widely used in many research and production laboratories, such as aeronautics and Astronautics, weapons industry, chemical industry and colleges and universities. It is especially suitable for automatic temperature control and high flow high temperature combined system and accessories test.

The range of air electric heater is wide: it can heat any gas and generate hot air, no water, no electricity, no burning, no explosion, no chemical corrosion, no pollution, safe and reliable, and the heating space will be heated up quickly (controllable).

In the case of disconnection, such as the channel of the heater outlet temperature control by temperature sensor, signal can not provide the correct signals always require heating, electric heater is becoming increasingly hot, if the work temperature sensor, can cut off the power supply, if the temperature sensor does not work, the electric heating element or burned, or container cracking and melting no matter what happens, in the proof occasions are likely to have unintended consequences.

If a loop sensor location close to the electric heater on heating, other circuits in the heating, temperature sensor cannot detect the correct temperature or later after several hundred degrees. When a plurality of electric heaters are used together on the same pry block, the wires may be mistaken intersecting. Many heat exchanger factory has invested a lot of experience on the tube cracking of shell and tube heat exchanger, however, cracking of the electric heater element, there are few papers, the reason is that the heating element filled with magnesium oxide solid, can crack in high pressure situation can make magnesium oxide made to the wiring cavity, causing electrical leakage.

High temperature magnesium oxide is good thermal conductive materials and insulation materials, and magnesium oxide to moisture absorption caused by reduced electrical insulation, moisture absorption because of moisture in the environment or for a long time or a long time cover wiring and so on, such as the power, the circuit breaker can not promptly cut off, the breakdown of heating elements.

Air heater is suitable for air duct in heating, specifications at low temperature, low temperature and high temperature in three forms, in the common structure is supported by a steel plate used to reduce the electric fan at the end of the electric vibration tube, in the junction box are equipped with ultra temperature control device.

On the other hand except in control with over temperature protection, between the fan and the heater is still transport device, to ensure that the electric heater must start after the fan is started in a heater plus differential pressure device, to prevent machine fault; low temperature type can be directly installed in the air duct, and the medium temperature and high temperature due to the structure type the differences in access to the outer wall heater junction box with 100mm thick insulation material, which is mainly to reduce external cooling and wiring cavity throughout the channel temperature, gas pressure passage heater generally should not exceed 0.3Kg/cm2, if you need more than the pressure, please use the circulation type electric heater; low temperature type gas heating heater the highest temperature is less than 160 DEG C; medium temperature is less than 260 DEG C; high temperature does not exceed 500 degrees.

The air channel type electric heater is used for the industrial air duct, the air conditioning duct and the industry air to increase the temperature of the output air through heating the air, and is generally inserted into the transverse opening of the air duct. According to the working temperature of the wind tunnel, it is divided into low temperature, moderate and moderate temperature, and the wind speed, the middle wind speed and the high wind speed are divided according to the wind speed in the air duct.