Metal tubular heating element terminology
1. Metal tubular heating element
A metal tube for the shell, the alloy heating wire as a heating element, at one end or both ends with a take-out rod (wire) filled with magnesium oxide insulation medium in the metal tube to fix the heating element heating element. 2. Lead rod: connected with the heating element for the components and power supply, components and components connected with the metal conductive parts. 3. Unfolding Length (L) (mm): The sum of the straight and curved length of the metal tube on the component pattern. 4. Heating length (t) (mm): the length of the heating element arranged on the element pattern.
5. Heating surface area (cm squared): heating length of the metal tube surface area.
6. Surface load (W / cm squared): power per unit area on the heating surface. 7. Full heat conditions: the components to work conditions to achieve the provisions of the working conditions. 8. Rated voltage (V): refers to the provisions of the design and the component casing marked on the connected components. 9. Rated power (kW): refers to the design and specified in the case of components on the component input power. 10. Operating voltage (V): For a single access to the power supply components, refers to the provisions of the design connected to the components of the voltage, that is, rated voltage; for multiple support connected to the power of a group of components, refers to the design When the provisions of the set of components connected to the voltage. 11. Operating temperature, ℃: The average temperature of the heating surface of the component under rated power and sufficient heating conditions.
12. Maximum temperature: at 1.27 times the rated power and full heat conditions, the component length of the maximum temperature on the heating point of the temperature. 13. Simulation conditions: Under the conditions of the standard terms, the use of measures to make the components of the working temperature and the specified value basically meet the working conditions. 14. Allow repair: Refers to the components of the extraction rod damage, the metal surface coating damage, insulator and seal failure to repair, and repair does not affect the performance of components and normal use. 15. Recovery: due to the use and long-term storage and other reasons, the electrical insulation properties of components below the standard value, by oven drying and other methods to make the electrical insulation properties back to the standard value of the process, and does not affect the performance of components and normal use . 16. Damage: a. Component withstand voltage is lower than the standard value, the leakage current is greater than 5mA or the insulation current is less than 1MΩ, and can not be recovered; b. Shell has a flame emission and melt, the surface of serious corrosion or other damage is not allowed to repair; c. component of the actual power than the rated power tolerance of 20%