Metal tubular electric heating element
The metal tube is used as the outer casing, and the alloy heating wire is used as the heating element, and the magnesium rod insulating medium is filled in the metal tube at one or both ends to fix the heating element of the heating element.
2. Lead out
Connected to the heating element, a metal conductive part for connecting components and power supplies, components and components.
3. Expanded length (L), mm
The sum of the straight line and the bending length of the metal tube on the component pattern.
4. Heating length (t), mm
The length of the heating element portion is arranged on the component pattern.
5. Heat surface area, cm square
The surface area of the metal tube on the length of the heat.
6. Surface load, W/cm square
The power per unit area on a hot surface.
7. Fully fever condition
The operating conditions that allow the component to reach the specified operating state.
8. Rated voltage, V
Refers to the voltage attached to the component that is specified at the time of design and marked on the component's housing.
9. Rated power, kW
Refers to the input power of the component specified at the time of design and marked on the component housing.
10. Working voltage, V
The component that is connected to the power supply in a single connection refers to the voltage connected to the component specified in the design. The single-ended electric heating pipe is the rated voltage; the group of components connected to the power supply in multiple serials means that the design is connected to the specified The voltage on this set of components.
11. Working temperature, °C
The average temperature of the component's hot surface at rated power and under full heat.
12. Maximum temperature
The temperature at the highest temperature point in the length of the component heating at 1.27 times the rated power and under sufficient heat.
13. Simulation conditions
In the state of each standard clause, measures are taken to ensure that the operating temperature of the component is substantially consistent with the specified operating conditions.
14. Allow repair
Refers to the damage of the extraction rod of the component, the damage of the metal surface coating, the repair of the insulator and the seal failure, and does not affect the performance and normal use of the component after repair.
Due to the use and long-term storage, the electrical insulation performance of the component is lower than the standard value, and the electrical insulation performance is restored to the standard value by oven drying, etc., without affecting the performance and normal use of the component.
a. The 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 it is unrecoverable;
b. The outer casing has flame emission and melt, severe corrosion of the surface or other damage that is not allowed to be repaired;
c. The actual power of the component is 20% worse than the rated power.