What is the working principle of a high-temperature oven
1、 Core Basic Principles
The high-temperature oven relies on electric heating tubes/wires to generate heat, combined with a fan to force hot air circulation, forming a uniform high-temperature environment inside the sealed box, and continuously heating the workpiece through thermal convection and radiation; Equipped with a temperature control system for temperature control, insulation, and timing
1、 Core Basic Principles
The high-temperature oven relies on electric heating tubes/wires to generate heat, combined with a fan to force hot air circulation, forming a uniform high-temperature environment inside the sealed box, and continuously heating the workpiece through thermal convection and radiation; Equipped with a temperature control system for temperature control, insulation, and timing, it achieves processes such as drying, curing, baking, and heat treatment.
2、 Division of labor and process for the entire system
1. Heating unit (heat source)
The mainstream is stainless steel finned electric heating tubes, which convert electrical energy into thermal energy when powered on;
Some industrial high-temperature models are equipped with far-infrared heating tubes to assist in heat radiation heating, resulting in a faster heating rate.
2. Hot air circulation system (determines the temperature uniformity inside the box, key components)
Install a circulating fan and air duct guide plate at the rear of the box;
The fan draws hot air from the heating zone into the air duct and evenly blows it into the working chamber through the air ducts on both sides/bottom;
Cold air sinks and flows back to the heating chamber for reheating, continuing in a closed-loop cycle;
Function: Eliminate local temperature differences, avoid workpiece burning and uneven heating, and the temperature difference of industrial ovens can be controlled within ± 1~± 3 ℃.
3. Sealed insulation chamber
Double layer sheet metal structure of the box, filled with high-density aluminum silicate insulation cotton in the middle:
Lock in internal high temperature, reduce heat leakage, and save electricity;
The outer wall is not hot to the touch to prevent burns to personnel;
Isolate external room temperature interference to ensure high temperature stability.
4. Temperature control sensor control system
Real time acquisition of temperature inside the box by thermocouple temperature probe;
Compare the set temperature and actual temperature of the temperature control instrument:
Actual measurement<set value: continuous electric heating;
Tested to reach the set value: Cut off the heating power supply, only the fan circulates for insulation;
Automatically reheat when the temperature drops and maintain a constant temperature;
Supporting over temperature protection: When the temperature exceeds the safe threshold, it will automatically shut down and trigger an alarm to prevent fire and equipment damage.
5. Exhaust and pressure relief components (optional, essential for glue, glue filling, plastic baking)
The exhaust valve/fan at the top of the box continuously discharges volatile water vapor, diluent, and organic waste gas during the baking process, avoiding gas accumulation and pressure rise inside the box, and preventing surface bubbles and pinholes on the workpiece.
3、 Complete workflow
Insert the workpiece and close the sealing box door;
Touch screen setting target high temperature and baking time;
The fan starts running first, and then the heating tube is powered on to increase the temperature;
Continuous convection heating of workpieces through hot air circulation, with real-time temperature measurement by thermocouples;
After reaching the set temperature, enter the constant temperature insulation stage;
At the end of the timer, the heating will be automatically cut off, and the fan can choose to continue blowing to cool down;
After the temperature drops to a safe level, open the door to retrieve the item.
4、 The synergistic effect of two heat transfer methods
Forced convection (dominant): Flowing hot air covers the workpiece completely, and batch baking is uniform and stable;
Thermal radiation (auxiliary): The infrared radiation from the heating tube directly transfers heat to the workpiece, accelerating the heating process.
5、 Conventional applicable temperature differentiation
Ordinary oven: room temperature~200 ℃;
High temperature industrial oven: 200 ℃~500 ℃;
6、 Common application scenarios correspond to principle advantages
Curing of adhesive products: hot air evenly controls temperature, slowly evaporates the solvent inside the adhesive, without cracking or foaming;
Hardware baking paint drying: full range constant temperature, consistent paint color;
Baking of electronic components: low temperature difference+over temperature protection to prevent high-temperature damage to components;
Material dehydration and drying: The exhaust system takes away water vapor and quickly removes moisture.
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