The structure and application of cartridge heater
The structure of cartridge heater:
The typical structure (the most popular structure) of a cartridge heater is the same as that of a tubular heater. It is generally composed of 5 parts: insulator, sealing material, lead rod, filler, heating wire, metal sheath, and terminal. The spiral heating wire and the lead-out help are located in the center of the metal sheath. Its manufacturing process is to penetrate the spiral heating wire into seamless steel pipe, copper pipe or aluminum pipe. The gap is evenly filled by a multi-tube filling machine. Thermally conductive oxidizing medium, such as crystalline magnesium oxide powder (alumina or clean quartz sand can also be used). Then use a tube shrinking machine to reduce the diameter of the tube to make the oxide medium compact (density reaches 3.3g/cm3 or more) to ensure that the heating wire is isolated from the air, and the center position does not shift and touch the tube wall. such. The heat per unit area can be increased more than ten times. The service life can be correspondingly increased to more than 10 years. Compared with electric heating elements with the same large heat, tubular electric heating tubes can save 5% of electric heating materials, and the thermal efficiency can reach more than 90%.
Application range of cartridge heater :
1. Mold heating has been accepted by a wide range of customers in modern industrial applications.
2. Heating system in plastic machinery.
3. Pharmaceutical production line.
4. Laboratory heat treatment test.
5. Chemical industry, etc.
