Your coil oven heating tube converts electrical energy into heat through Joule heating (resistive heating). When electricity flows through the high-resistance alloy wire coiled inside the tube, the wire resists the current, generating intense heat.
Key Components & Functions:
1.Resistive Element (Heating Coil):
You use a tightly wound coil of nickel-chromium (NiCr) or iron-chromium-aluminum (FeCrAl) alloy wire.
This coil's high electrical resistance causes it to heat rapidly when current passes through it.
2.Insulation Layer (MgO Powder):
The coil is embedded in compressed magnesium oxide (MgO) powder inside the tube.
MgO electrically insulates the coil from the outer sheath while efficiently transferring heat.
3.Metal Sheath (Protective Jacket):
A seamless stainless steel or Incoloy sheath encases the MgO and coil.
It protects against corrosion, physical damage, and prevents contact with moisture or contaminants.
4.Terminal Seals:
Hermetic seals at both ends prevent oxidation and moisture ingress, ensuring long-term reliability.
Operational Process:
1.electrical Connection:
You connect terminals to a power source (e.g., 120V–480V AC).
2.Heat Generation:
Current flows through the coiled resistive wire, heating it to 600°C–1,000°C (depending on design).
3.Heat Transfer:
Heat radiates from the coil → conducts through MgO → reaches the sheath → transfers to the oven cavity via infrared radiation and convection.
4.Thermal Regulation:
A thermostat or controller cycles power to maintain your set temperature.
Why the Coil Design?
1.Maximizes heated surface area within compact space.
2.Reduces localized hotspots via uniform heat distribution.
3.Extends lifespan by accommodating thermal expansion/contraction.
Safety & Efficiency Features:
1.Dielectric Strength: MgO insulation withstands high voltages (typically >1,500V).
2.Corrosion Resistance: Sheath material (e.g., 304 stainless steel) resists oxidation at high temps.
3.Fast Response: Low thermal mass enables rapid heating/cooling cycles.
Applications in Your Oven:
1.Mounted on oven walls, under stovetops, or as immersion heaters in liquids.
2.Ideal for baking, drying, industrial processes, and food service equipment.
