How to verify the quality of flanged tubular heater?
Verify the electric flanged tubular heater quality the most intuitionistic method is: First, wipe the surface of the electric flanged tubular heater, and then turn on the ac 220 v power supply, in dry air to burn, surface after the red power, to be completely cooled, the electric heating tube with a paper napkin to wipe, should be no black on white paper oxide powder (does not react with oxygen in the air), It indicates that the electric flanged tubular heater is of high quality.
The quality of electric flanged tubular heater mainly depends on the following aspects: electrical strength, insulation, leakage current, power accuracy, life, corrosion resistance, size appearance, etc.
1. Electrical strength: The factors affecting the electrical strength of electric flanged tubular heater mainly include the thickness of the insulation layer, the quality of the insulation layer, the length of the electric heating pipe, the radius of bending and the number of R parts of bending. Now in the electric heating pipe on the cold withstand voltage is generally required to reach 2000V/1s breakdown current 0.5mA.
2. Insulation: The sealing process of electric flanged tubular heater is the main influence on the insulation of electric heat pipe. Generally high temperature magnesium oxide powder to at least 104 M Ω after sealing, low temperature in the medium temperature magnesium oxide powder and magnesium oxide powder or modified to reach 103 M Ω.
3. Leakage current: it is mainly related to the temperature of the electric flanged tubular heater and the voltage of the electric flanged tubular heater and the length of the flanged tubular heater and the quality of the magnesium powder. This is also an important evaluation index for high temperature electric heating pipe.
4. Power accuracy: it is mainly related to the quality of the resistance wire and the technological level of the manufacturer. Generally, a temperature coefficient test is required before mass production to determine the qualified power range of cold resistance.
5.Service life: the service life of electric flanged tubular heater is not only related to the quality of resistance wire, but also related to the quality of magnesium oxide (and the choice of pipe material), the choice of resistance wire diameter and other factors. It is best to control the surface load of empty and dry heat pipe within 8W/cm2. When selecting the diameter of the resistance wire, the surface load of the resistance wire should be calculated to meet the life requirement.
6. Corrosion resistance: water heating electric flanged tubular heater and air dry heating electric heating pipe often encounter problems. In addition to the reasonable choice of (pipe) material, but also with the heat treatment of electric heating pipe, electric heating pipe surface state.
7. Size and appearance: meet the assembly requirements of customers, reflecting the factory's technology, manufacturing, tooling support ability, appearance can also reflect the grade of products and manufacturing level.