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Internally Wired Cartridge Heater
Keyword: Internally Wired Cartridge Heater
Description
1. Material
· Metal Sheath: Typically made of stainless steel, commonly grades SUS304 or SUS316. This provides excellent corrosion resistance and good structural strength, allowing it to adapt to various working environments.
· Insulating Filler: The gap between the resistance wire and metal tube is filled with high-purity, highly thermally conductive Magnesium Oxide (MgO) powder. It serves both as an electrical insulator to prevent short circuits and efficiently transfers heat from the resistance wire to the metal sheath.
· Resistance Wire: Generally made of Nickel-Chromium (NiCr) alloy wire, known for its high resistivity and stable heating performance.
· Lead Wires: Usually silicone rubber high-temperature wires or fiberglass braided wires are used, capable of withstanding the high-temperature environment near the heater.
2. Dimensions
· Tube Diameter: 8mm. This is a very universal size, making it easy to drill mounting holes in heater blocks.
· Tube Length: 100mm. This length, combined with its power rating, determines its surface power density (watts per square centimeter), a crucial parameter for design.
· Total Length: Usually refers to the full length including the lead wires, which is specified separately in product specifications.
3. Voltage & Power
· Rated Voltage: 12V DC. This is a low-voltage heater, typically used in mobile equipment, automotive applications, or scenarios powered by safe low-voltage sources.
· Rated Power: 100W. It can stably output 100 watts of thermal power at its rated voltage.
· Key Parameter Relationship: Power (P) = Voltage (V) x Current (I). According to this formula, the operating current of this heater is approximately 8.33A. This means the power wires and controller supplying it must be capable of handling at least 10A current.
4. Characteristics
· High Corrosion Resistance: The stainless steel sheath allows it to adapt to slightly humid or chemical environments.
· Compact Structure & High Power Density: Small size, significant heat output, and fast thermal response.
· Easy Installation & Long Lifespan: Designed for "interference fit" installation, where it is directly inserted or pressed into a heating hole, ensuring high heat transfer efficiency. The internal structure is stable and oxidation-resistant, contributing to a long service life.
· Good Mechanical Strength: The metal tube body possesses certain pressure and bending resistance.
· Requires a Temperature Control System: Due to its low thermal inertia, it can easily overheat and damage itself or the equipment being heated if uncontrolled. Therefore, it must be used with a thermocouple/thermistor and a temperature controller (e.g., a PID controller).
5. Applications
· 3D Printers: The most typical application, used to heat the hotend to melt and extrude printing materials (e.g., PLA, ABS).
· Small Plastic Machinery: Melting and heating in small injection molding machines, extruders, etc.
· Packaging Equipment: Heating of heat sealing jaws, hot stamping heads, etc.
· Medical Equipment: Devices requiring precise and stable heat sources.
· Food & Beverage Equipment: Small ovens, warming cabinets, etc.
· Laboratory & Analytical Instruments: For constant temperature control or heating of samples.
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