The precautions when using a radiation tube are as follows:
1. Components are allowed to work under the following conditions:
(1) The relative humidity of the air is not greater than 95%, and there are no explosive or corrosive gases.
(2) The working voltage should not exceed 1.1 times the rated value, and the casing should be effectively grounded.
(3) Insulation resistance 1m, dielectric strength: 2KV/1min.
2. The electric heating tube should be positioned and fixed, and the effective heating area should be completely immersed in liquid or metal solid. White burning is prohibited. When scale or carbon deposits are found on the surface of the radiation tube, they should be cleaned in a timely manner for repeated use to avoid affecting heat dissipation and shortening the service life.
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When heating molten metals or solids, such as nitrates, alkalis, and leached paraffin, the operating voltage should be reduced first, and only after the medium melts can it be raised to the rated voltage.
4. When heating air, the components should be arranged evenly to ensure good heat dissipation conditions and sufficient heating of the flowing air.
5. When heating nitrate, safety measures should be considered to prevent explosion accidents.
6. The wiring part should be placed outside the insulation layer to avoid contact with corrosive, explosive media, and moisture; The wiring should be able to withstand the temperature and thermal load of the wiring part for a long time, and excessive force should be avoided when tightening the wiring screws.
7. Components should be stored in a dry place. If the insulation resistance is lower than 1 m due to long-term storage, they can be dried in an oven of about 200 or heated by voltage reduction and electrification until the insulation resistance is restored.
8. The magnesium oxide powder at the outlet of the electric heating radiation tube should be prevented from pollutants and moisture infiltration in the usage area to prevent the occurrence of electric leakage accidents.
What are the advantages of radiation tubes?
The advantages of radiation tubes are reflected in the following aspects:
1. Linear spiral wound electric heating radiation tube This type of electric heating radiation tube consists of a heat-resistant alloy steel sleeve and a heater. The heater is usually wound with an electric heating wire on a heat-resistant insulating ceramic tube core with a spiral groove.
2. The structure of this heater is basically the same as the first type of heater, except that the heating element is wrapped with a resistance band, and the core is mainly composed of multiple groups of cores. Under the same surface load, the heat dissipation surface is large, which can save materials. This form is generally used for high-power point heating radiation tubes.
3. Axial zigzag cage type electric heating radiation tube (commonly known as squirrel cage type) is a type of radiation tube that bends the resistance wire (strip) of the heating element into a "U" shape, strings it into several insulated and high-temperature resistant ceramic support plates, and fixes them in the middle with heat-resistant rods. This type of radiation tube has a long service life